File: | tools/clang/lib/AST/ExprConstant.cpp |
Warning: | line 5315, column 57 Called C++ object pointer is null |
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1 | //===--- ExprConstant.cpp - Expression Constant Evaluator -----------------===// | ||||||
2 | // | ||||||
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||||||
4 | // See https://llvm.org/LICENSE.txt for license information. | ||||||
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||||||
6 | // | ||||||
7 | //===----------------------------------------------------------------------===// | ||||||
8 | // | ||||||
9 | // This file implements the Expr constant evaluator. | ||||||
10 | // | ||||||
11 | // Constant expression evaluation produces four main results: | ||||||
12 | // | ||||||
13 | // * A success/failure flag indicating whether constant folding was successful. | ||||||
14 | // This is the 'bool' return value used by most of the code in this file. A | ||||||
15 | // 'false' return value indicates that constant folding has failed, and any | ||||||
16 | // appropriate diagnostic has already been produced. | ||||||
17 | // | ||||||
18 | // * An evaluated result, valid only if constant folding has not failed. | ||||||
19 | // | ||||||
20 | // * A flag indicating if evaluation encountered (unevaluated) side-effects. | ||||||
21 | // These arise in cases such as (sideEffect(), 0) and (sideEffect() || 1), | ||||||
22 | // where it is possible to determine the evaluated result regardless. | ||||||
23 | // | ||||||
24 | // * A set of notes indicating why the evaluation was not a constant expression | ||||||
25 | // (under the C++11 / C++1y rules only, at the moment), or, if folding failed | ||||||
26 | // too, why the expression could not be folded. | ||||||
27 | // | ||||||
28 | // If we are checking for a potential constant expression, failure to constant | ||||||
29 | // fold a potential constant sub-expression will be indicated by a 'false' | ||||||
30 | // return value (the expression could not be folded) and no diagnostic (the | ||||||
31 | // expression is not necessarily non-constant). | ||||||
32 | // | ||||||
33 | //===----------------------------------------------------------------------===// | ||||||
34 | |||||||
35 | #include <cstring> | ||||||
36 | #include <functional> | ||||||
37 | #include "Interp/Context.h" | ||||||
38 | #include "Interp/Frame.h" | ||||||
39 | #include "Interp/State.h" | ||||||
40 | #include "clang/AST/APValue.h" | ||||||
41 | #include "clang/AST/ASTContext.h" | ||||||
42 | #include "clang/AST/ASTDiagnostic.h" | ||||||
43 | #include "clang/AST/ASTLambda.h" | ||||||
44 | #include "clang/AST/CXXInheritance.h" | ||||||
45 | #include "clang/AST/CharUnits.h" | ||||||
46 | #include "clang/AST/CurrentSourceLocExprScope.h" | ||||||
47 | #include "clang/AST/Expr.h" | ||||||
48 | #include "clang/AST/OSLog.h" | ||||||
49 | #include "clang/AST/OptionalDiagnostic.h" | ||||||
50 | #include "clang/AST/RecordLayout.h" | ||||||
51 | #include "clang/AST/StmtVisitor.h" | ||||||
52 | #include "clang/AST/TypeLoc.h" | ||||||
53 | #include "clang/Basic/Builtins.h" | ||||||
54 | #include "clang/Basic/FixedPoint.h" | ||||||
55 | #include "clang/Basic/TargetInfo.h" | ||||||
56 | #include "llvm/ADT/Optional.h" | ||||||
57 | #include "llvm/ADT/SmallBitVector.h" | ||||||
58 | #include "llvm/Support/SaveAndRestore.h" | ||||||
59 | #include "llvm/Support/raw_ostream.h" | ||||||
60 | |||||||
61 | #define DEBUG_TYPE"exprconstant" "exprconstant" | ||||||
62 | |||||||
63 | using namespace clang; | ||||||
64 | using llvm::APInt; | ||||||
65 | using llvm::APSInt; | ||||||
66 | using llvm::APFloat; | ||||||
67 | using llvm::Optional; | ||||||
68 | |||||||
69 | namespace { | ||||||
70 | struct LValue; | ||||||
71 | class CallStackFrame; | ||||||
72 | class EvalInfo; | ||||||
73 | |||||||
74 | using SourceLocExprScopeGuard = | ||||||
75 | CurrentSourceLocExprScope::SourceLocExprScopeGuard; | ||||||
76 | |||||||
77 | static QualType getType(APValue::LValueBase B) { | ||||||
78 | if (!B) return QualType(); | ||||||
79 | if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { | ||||||
80 | // FIXME: It's unclear where we're supposed to take the type from, and | ||||||
81 | // this actually matters for arrays of unknown bound. Eg: | ||||||
82 | // | ||||||
83 | // extern int arr[]; void f() { extern int arr[3]; }; | ||||||
84 | // constexpr int *p = &arr[1]; // valid? | ||||||
85 | // | ||||||
86 | // For now, we take the array bound from the most recent declaration. | ||||||
87 | for (auto *Redecl = cast<ValueDecl>(D->getMostRecentDecl()); Redecl; | ||||||
88 | Redecl = cast_or_null<ValueDecl>(Redecl->getPreviousDecl())) { | ||||||
89 | QualType T = Redecl->getType(); | ||||||
90 | if (!T->isIncompleteArrayType()) | ||||||
91 | return T; | ||||||
92 | } | ||||||
93 | return D->getType(); | ||||||
94 | } | ||||||
95 | |||||||
96 | if (B.is<TypeInfoLValue>()) | ||||||
97 | return B.getTypeInfoType(); | ||||||
98 | |||||||
99 | if (B.is<DynamicAllocLValue>()) | ||||||
100 | return B.getDynamicAllocType(); | ||||||
101 | |||||||
102 | const Expr *Base = B.get<const Expr*>(); | ||||||
103 | |||||||
104 | // For a materialized temporary, the type of the temporary we materialized | ||||||
105 | // may not be the type of the expression. | ||||||
106 | if (const MaterializeTemporaryExpr *MTE = | ||||||
107 | dyn_cast<MaterializeTemporaryExpr>(Base)) { | ||||||
108 | SmallVector<const Expr *, 2> CommaLHSs; | ||||||
109 | SmallVector<SubobjectAdjustment, 2> Adjustments; | ||||||
110 | const Expr *Temp = MTE->GetTemporaryExpr(); | ||||||
111 | const Expr *Inner = Temp->skipRValueSubobjectAdjustments(CommaLHSs, | ||||||
112 | Adjustments); | ||||||
113 | // Keep any cv-qualifiers from the reference if we generated a temporary | ||||||
114 | // for it directly. Otherwise use the type after adjustment. | ||||||
115 | if (!Adjustments.empty()) | ||||||
116 | return Inner->getType(); | ||||||
117 | } | ||||||
118 | |||||||
119 | return Base->getType(); | ||||||
120 | } | ||||||
121 | |||||||
122 | /// Get an LValue path entry, which is known to not be an array index, as a | ||||||
123 | /// field declaration. | ||||||
124 | static const FieldDecl *getAsField(APValue::LValuePathEntry E) { | ||||||
125 | return dyn_cast_or_null<FieldDecl>(E.getAsBaseOrMember().getPointer()); | ||||||
126 | } | ||||||
127 | /// Get an LValue path entry, which is known to not be an array index, as a | ||||||
128 | /// base class declaration. | ||||||
129 | static const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) { | ||||||
130 | return dyn_cast_or_null<CXXRecordDecl>(E.getAsBaseOrMember().getPointer()); | ||||||
131 | } | ||||||
132 | /// Determine whether this LValue path entry for a base class names a virtual | ||||||
133 | /// base class. | ||||||
134 | static bool isVirtualBaseClass(APValue::LValuePathEntry E) { | ||||||
135 | return E.getAsBaseOrMember().getInt(); | ||||||
136 | } | ||||||
137 | |||||||
138 | /// Given an expression, determine the type used to store the result of | ||||||
139 | /// evaluating that expression. | ||||||
140 | static QualType getStorageType(ASTContext &Ctx, Expr *E) { | ||||||
141 | if (E->isRValue()) | ||||||
142 | return E->getType(); | ||||||
143 | return Ctx.getLValueReferenceType(E->getType()); | ||||||
144 | } | ||||||
145 | |||||||
146 | /// Given a CallExpr, try to get the alloc_size attribute. May return null. | ||||||
147 | static const AllocSizeAttr *getAllocSizeAttr(const CallExpr *CE) { | ||||||
148 | const FunctionDecl *Callee = CE->getDirectCallee(); | ||||||
149 | return Callee ? Callee->getAttr<AllocSizeAttr>() : nullptr; | ||||||
150 | } | ||||||
151 | |||||||
152 | /// Attempts to unwrap a CallExpr (with an alloc_size attribute) from an Expr. | ||||||
153 | /// This will look through a single cast. | ||||||
154 | /// | ||||||
155 | /// Returns null if we couldn't unwrap a function with alloc_size. | ||||||
156 | static const CallExpr *tryUnwrapAllocSizeCall(const Expr *E) { | ||||||
157 | if (!E->getType()->isPointerType()) | ||||||
158 | return nullptr; | ||||||
159 | |||||||
160 | E = E->IgnoreParens(); | ||||||
161 | // If we're doing a variable assignment from e.g. malloc(N), there will | ||||||
162 | // probably be a cast of some kind. In exotic cases, we might also see a | ||||||
163 | // top-level ExprWithCleanups. Ignore them either way. | ||||||
164 | if (const auto *FE = dyn_cast<FullExpr>(E)) | ||||||
165 | E = FE->getSubExpr()->IgnoreParens(); | ||||||
166 | |||||||
167 | if (const auto *Cast = dyn_cast<CastExpr>(E)) | ||||||
168 | E = Cast->getSubExpr()->IgnoreParens(); | ||||||
169 | |||||||
170 | if (const auto *CE = dyn_cast<CallExpr>(E)) | ||||||
171 | return getAllocSizeAttr(CE) ? CE : nullptr; | ||||||
172 | return nullptr; | ||||||
173 | } | ||||||
174 | |||||||
175 | /// Determines whether or not the given Base contains a call to a function | ||||||
176 | /// with the alloc_size attribute. | ||||||
177 | static bool isBaseAnAllocSizeCall(APValue::LValueBase Base) { | ||||||
178 | const auto *E = Base.dyn_cast<const Expr *>(); | ||||||
179 | return E && E->getType()->isPointerType() && tryUnwrapAllocSizeCall(E); | ||||||
180 | } | ||||||
181 | |||||||
182 | /// The bound to claim that an array of unknown bound has. | ||||||
183 | /// The value in MostDerivedArraySize is undefined in this case. So, set it | ||||||
184 | /// to an arbitrary value that's likely to loudly break things if it's used. | ||||||
185 | static const uint64_t AssumedSizeForUnsizedArray = | ||||||
186 | std::numeric_limits<uint64_t>::max() / 2; | ||||||
187 | |||||||
188 | /// Determines if an LValue with the given LValueBase will have an unsized | ||||||
189 | /// array in its designator. | ||||||
190 | /// Find the path length and type of the most-derived subobject in the given | ||||||
191 | /// path, and find the size of the containing array, if any. | ||||||
192 | static unsigned | ||||||
193 | findMostDerivedSubobject(ASTContext &Ctx, APValue::LValueBase Base, | ||||||
194 | ArrayRef<APValue::LValuePathEntry> Path, | ||||||
195 | uint64_t &ArraySize, QualType &Type, bool &IsArray, | ||||||
196 | bool &FirstEntryIsUnsizedArray) { | ||||||
197 | // This only accepts LValueBases from APValues, and APValues don't support | ||||||
198 | // arrays that lack size info. | ||||||
199 | assert(!isBaseAnAllocSizeCall(Base) &&((!isBaseAnAllocSizeCall(Base) && "Unsized arrays shouldn't appear here" ) ? static_cast<void> (0) : __assert_fail ("!isBaseAnAllocSizeCall(Base) && \"Unsized arrays shouldn't appear here\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 200, __PRETTY_FUNCTION__)) | ||||||
200 | "Unsized arrays shouldn't appear here")((!isBaseAnAllocSizeCall(Base) && "Unsized arrays shouldn't appear here" ) ? static_cast<void> (0) : __assert_fail ("!isBaseAnAllocSizeCall(Base) && \"Unsized arrays shouldn't appear here\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 200, __PRETTY_FUNCTION__)); | ||||||
201 | unsigned MostDerivedLength = 0; | ||||||
202 | Type = getType(Base); | ||||||
203 | |||||||
204 | for (unsigned I = 0, N = Path.size(); I != N; ++I) { | ||||||
205 | if (Type->isArrayType()) { | ||||||
206 | const ArrayType *AT = Ctx.getAsArrayType(Type); | ||||||
207 | Type = AT->getElementType(); | ||||||
208 | MostDerivedLength = I + 1; | ||||||
209 | IsArray = true; | ||||||
210 | |||||||
211 | if (auto *CAT = dyn_cast<ConstantArrayType>(AT)) { | ||||||
212 | ArraySize = CAT->getSize().getZExtValue(); | ||||||
213 | } else { | ||||||
214 | assert(I == 0 && "unexpected unsized array designator")((I == 0 && "unexpected unsized array designator") ? static_cast <void> (0) : __assert_fail ("I == 0 && \"unexpected unsized array designator\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 214, __PRETTY_FUNCTION__)); | ||||||
215 | FirstEntryIsUnsizedArray = true; | ||||||
216 | ArraySize = AssumedSizeForUnsizedArray; | ||||||
217 | } | ||||||
218 | } else if (Type->isAnyComplexType()) { | ||||||
219 | const ComplexType *CT = Type->castAs<ComplexType>(); | ||||||
220 | Type = CT->getElementType(); | ||||||
221 | ArraySize = 2; | ||||||
222 | MostDerivedLength = I + 1; | ||||||
223 | IsArray = true; | ||||||
224 | } else if (const FieldDecl *FD = getAsField(Path[I])) { | ||||||
225 | Type = FD->getType(); | ||||||
226 | ArraySize = 0; | ||||||
227 | MostDerivedLength = I + 1; | ||||||
228 | IsArray = false; | ||||||
229 | } else { | ||||||
230 | // Path[I] describes a base class. | ||||||
231 | ArraySize = 0; | ||||||
232 | IsArray = false; | ||||||
233 | } | ||||||
234 | } | ||||||
235 | return MostDerivedLength; | ||||||
236 | } | ||||||
237 | |||||||
238 | /// A path from a glvalue to a subobject of that glvalue. | ||||||
239 | struct SubobjectDesignator { | ||||||
240 | /// True if the subobject was named in a manner not supported by C++11. Such | ||||||
241 | /// lvalues can still be folded, but they are not core constant expressions | ||||||
242 | /// and we cannot perform lvalue-to-rvalue conversions on them. | ||||||
243 | unsigned Invalid : 1; | ||||||
244 | |||||||
245 | /// Is this a pointer one past the end of an object? | ||||||
246 | unsigned IsOnePastTheEnd : 1; | ||||||
247 | |||||||
248 | /// Indicator of whether the first entry is an unsized array. | ||||||
249 | unsigned FirstEntryIsAnUnsizedArray : 1; | ||||||
250 | |||||||
251 | /// Indicator of whether the most-derived object is an array element. | ||||||
252 | unsigned MostDerivedIsArrayElement : 1; | ||||||
253 | |||||||
254 | /// The length of the path to the most-derived object of which this is a | ||||||
255 | /// subobject. | ||||||
256 | unsigned MostDerivedPathLength : 28; | ||||||
257 | |||||||
258 | /// The size of the array of which the most-derived object is an element. | ||||||
259 | /// This will always be 0 if the most-derived object is not an array | ||||||
260 | /// element. 0 is not an indicator of whether or not the most-derived object | ||||||
261 | /// is an array, however, because 0-length arrays are allowed. | ||||||
262 | /// | ||||||
263 | /// If the current array is an unsized array, the value of this is | ||||||
264 | /// undefined. | ||||||
265 | uint64_t MostDerivedArraySize; | ||||||
266 | |||||||
267 | /// The type of the most derived object referred to by this address. | ||||||
268 | QualType MostDerivedType; | ||||||
269 | |||||||
270 | typedef APValue::LValuePathEntry PathEntry; | ||||||
271 | |||||||
272 | /// The entries on the path from the glvalue to the designated subobject. | ||||||
273 | SmallVector<PathEntry, 8> Entries; | ||||||
274 | |||||||
275 | SubobjectDesignator() : Invalid(true) {} | ||||||
276 | |||||||
277 | explicit SubobjectDesignator(QualType T) | ||||||
278 | : Invalid(false), IsOnePastTheEnd(false), | ||||||
279 | FirstEntryIsAnUnsizedArray(false), MostDerivedIsArrayElement(false), | ||||||
280 | MostDerivedPathLength(0), MostDerivedArraySize(0), | ||||||
281 | MostDerivedType(T) {} | ||||||
282 | |||||||
283 | SubobjectDesignator(ASTContext &Ctx, const APValue &V) | ||||||
284 | : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false), | ||||||
285 | FirstEntryIsAnUnsizedArray(false), MostDerivedIsArrayElement(false), | ||||||
286 | MostDerivedPathLength(0), MostDerivedArraySize(0) { | ||||||
287 | assert(V.isLValue() && "Non-LValue used to make an LValue designator?")((V.isLValue() && "Non-LValue used to make an LValue designator?" ) ? static_cast<void> (0) : __assert_fail ("V.isLValue() && \"Non-LValue used to make an LValue designator?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 287, __PRETTY_FUNCTION__)); | ||||||
288 | if (!Invalid) { | ||||||
289 | IsOnePastTheEnd = V.isLValueOnePastTheEnd(); | ||||||
290 | ArrayRef<PathEntry> VEntries = V.getLValuePath(); | ||||||
291 | Entries.insert(Entries.end(), VEntries.begin(), VEntries.end()); | ||||||
292 | if (V.getLValueBase()) { | ||||||
293 | bool IsArray = false; | ||||||
294 | bool FirstIsUnsizedArray = false; | ||||||
295 | MostDerivedPathLength = findMostDerivedSubobject( | ||||||
296 | Ctx, V.getLValueBase(), V.getLValuePath(), MostDerivedArraySize, | ||||||
297 | MostDerivedType, IsArray, FirstIsUnsizedArray); | ||||||
298 | MostDerivedIsArrayElement = IsArray; | ||||||
299 | FirstEntryIsAnUnsizedArray = FirstIsUnsizedArray; | ||||||
300 | } | ||||||
301 | } | ||||||
302 | } | ||||||
303 | |||||||
304 | void truncate(ASTContext &Ctx, APValue::LValueBase Base, | ||||||
305 | unsigned NewLength) { | ||||||
306 | if (Invalid) | ||||||
307 | return; | ||||||
308 | |||||||
309 | assert(Base && "cannot truncate path for null pointer")((Base && "cannot truncate path for null pointer") ? static_cast <void> (0) : __assert_fail ("Base && \"cannot truncate path for null pointer\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 309, __PRETTY_FUNCTION__)); | ||||||
310 | assert(NewLength <= Entries.size() && "not a truncation")((NewLength <= Entries.size() && "not a truncation" ) ? static_cast<void> (0) : __assert_fail ("NewLength <= Entries.size() && \"not a truncation\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 310, __PRETTY_FUNCTION__)); | ||||||
311 | |||||||
312 | if (NewLength == Entries.size()) | ||||||
313 | return; | ||||||
314 | Entries.resize(NewLength); | ||||||
315 | |||||||
316 | bool IsArray = false; | ||||||
317 | bool FirstIsUnsizedArray = false; | ||||||
318 | MostDerivedPathLength = findMostDerivedSubobject( | ||||||
319 | Ctx, Base, Entries, MostDerivedArraySize, MostDerivedType, IsArray, | ||||||
320 | FirstIsUnsizedArray); | ||||||
321 | MostDerivedIsArrayElement = IsArray; | ||||||
322 | FirstEntryIsAnUnsizedArray = FirstIsUnsizedArray; | ||||||
323 | } | ||||||
324 | |||||||
325 | void setInvalid() { | ||||||
326 | Invalid = true; | ||||||
327 | Entries.clear(); | ||||||
328 | } | ||||||
329 | |||||||
330 | /// Determine whether the most derived subobject is an array without a | ||||||
331 | /// known bound. | ||||||
332 | bool isMostDerivedAnUnsizedArray() const { | ||||||
333 | assert(!Invalid && "Calling this makes no sense on invalid designators")((!Invalid && "Calling this makes no sense on invalid designators" ) ? static_cast<void> (0) : __assert_fail ("!Invalid && \"Calling this makes no sense on invalid designators\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 333, __PRETTY_FUNCTION__)); | ||||||
334 | return Entries.size() == 1 && FirstEntryIsAnUnsizedArray; | ||||||
335 | } | ||||||
336 | |||||||
337 | /// Determine what the most derived array's size is. Results in an assertion | ||||||
338 | /// failure if the most derived array lacks a size. | ||||||
339 | uint64_t getMostDerivedArraySize() const { | ||||||
340 | assert(!isMostDerivedAnUnsizedArray() && "Unsized array has no size")((!isMostDerivedAnUnsizedArray() && "Unsized array has no size" ) ? static_cast<void> (0) : __assert_fail ("!isMostDerivedAnUnsizedArray() && \"Unsized array has no size\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 340, __PRETTY_FUNCTION__)); | ||||||
341 | return MostDerivedArraySize; | ||||||
342 | } | ||||||
343 | |||||||
344 | /// Determine whether this is a one-past-the-end pointer. | ||||||
345 | bool isOnePastTheEnd() const { | ||||||
346 | assert(!Invalid)((!Invalid) ? static_cast<void> (0) : __assert_fail ("!Invalid" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 346, __PRETTY_FUNCTION__)); | ||||||
347 | if (IsOnePastTheEnd) | ||||||
348 | return true; | ||||||
349 | if (!isMostDerivedAnUnsizedArray() && MostDerivedIsArrayElement && | ||||||
350 | Entries[MostDerivedPathLength - 1].getAsArrayIndex() == | ||||||
351 | MostDerivedArraySize) | ||||||
352 | return true; | ||||||
353 | return false; | ||||||
354 | } | ||||||
355 | |||||||
356 | /// Get the range of valid index adjustments in the form | ||||||
357 | /// {maximum value that can be subtracted from this pointer, | ||||||
358 | /// maximum value that can be added to this pointer} | ||||||
359 | std::pair<uint64_t, uint64_t> validIndexAdjustments() { | ||||||
360 | if (Invalid || isMostDerivedAnUnsizedArray()) | ||||||
361 | return {0, 0}; | ||||||
362 | |||||||
363 | // [expr.add]p4: For the purposes of these operators, a pointer to a | ||||||
364 | // nonarray object behaves the same as a pointer to the first element of | ||||||
365 | // an array of length one with the type of the object as its element type. | ||||||
366 | bool IsArray = MostDerivedPathLength == Entries.size() && | ||||||
367 | MostDerivedIsArrayElement; | ||||||
368 | uint64_t ArrayIndex = IsArray ? Entries.back().getAsArrayIndex() | ||||||
369 | : (uint64_t)IsOnePastTheEnd; | ||||||
370 | uint64_t ArraySize = | ||||||
371 | IsArray ? getMostDerivedArraySize() : (uint64_t)1; | ||||||
372 | return {ArrayIndex, ArraySize - ArrayIndex}; | ||||||
373 | } | ||||||
374 | |||||||
375 | /// Check that this refers to a valid subobject. | ||||||
376 | bool isValidSubobject() const { | ||||||
377 | if (Invalid) | ||||||
378 | return false; | ||||||
379 | return !isOnePastTheEnd(); | ||||||
380 | } | ||||||
381 | /// Check that this refers to a valid subobject, and if not, produce a | ||||||
382 | /// relevant diagnostic and set the designator as invalid. | ||||||
383 | bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK); | ||||||
384 | |||||||
385 | /// Get the type of the designated object. | ||||||
386 | QualType getType(ASTContext &Ctx) const { | ||||||
387 | assert(!Invalid && "invalid designator has no subobject type")((!Invalid && "invalid designator has no subobject type" ) ? static_cast<void> (0) : __assert_fail ("!Invalid && \"invalid designator has no subobject type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 387, __PRETTY_FUNCTION__)); | ||||||
388 | return MostDerivedPathLength == Entries.size() | ||||||
389 | ? MostDerivedType | ||||||
390 | : Ctx.getRecordType(getAsBaseClass(Entries.back())); | ||||||
391 | } | ||||||
392 | |||||||
393 | /// Update this designator to refer to the first element within this array. | ||||||
394 | void addArrayUnchecked(const ConstantArrayType *CAT) { | ||||||
395 | Entries.push_back(PathEntry::ArrayIndex(0)); | ||||||
396 | |||||||
397 | // This is a most-derived object. | ||||||
398 | MostDerivedType = CAT->getElementType(); | ||||||
399 | MostDerivedIsArrayElement = true; | ||||||
400 | MostDerivedArraySize = CAT->getSize().getZExtValue(); | ||||||
401 | MostDerivedPathLength = Entries.size(); | ||||||
402 | } | ||||||
403 | /// Update this designator to refer to the first element within the array of | ||||||
404 | /// elements of type T. This is an array of unknown size. | ||||||
405 | void addUnsizedArrayUnchecked(QualType ElemTy) { | ||||||
406 | Entries.push_back(PathEntry::ArrayIndex(0)); | ||||||
407 | |||||||
408 | MostDerivedType = ElemTy; | ||||||
409 | MostDerivedIsArrayElement = true; | ||||||
410 | // The value in MostDerivedArraySize is undefined in this case. So, set it | ||||||
411 | // to an arbitrary value that's likely to loudly break things if it's | ||||||
412 | // used. | ||||||
413 | MostDerivedArraySize = AssumedSizeForUnsizedArray; | ||||||
414 | MostDerivedPathLength = Entries.size(); | ||||||
415 | } | ||||||
416 | /// Update this designator to refer to the given base or member of this | ||||||
417 | /// object. | ||||||
418 | void addDeclUnchecked(const Decl *D, bool Virtual = false) { | ||||||
419 | Entries.push_back(APValue::BaseOrMemberType(D, Virtual)); | ||||||
420 | |||||||
421 | // If this isn't a base class, it's a new most-derived object. | ||||||
422 | if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) { | ||||||
423 | MostDerivedType = FD->getType(); | ||||||
424 | MostDerivedIsArrayElement = false; | ||||||
425 | MostDerivedArraySize = 0; | ||||||
426 | MostDerivedPathLength = Entries.size(); | ||||||
427 | } | ||||||
428 | } | ||||||
429 | /// Update this designator to refer to the given complex component. | ||||||
430 | void addComplexUnchecked(QualType EltTy, bool Imag) { | ||||||
431 | Entries.push_back(PathEntry::ArrayIndex(Imag)); | ||||||
432 | |||||||
433 | // This is technically a most-derived object, though in practice this | ||||||
434 | // is unlikely to matter. | ||||||
435 | MostDerivedType = EltTy; | ||||||
436 | MostDerivedIsArrayElement = true; | ||||||
437 | MostDerivedArraySize = 2; | ||||||
438 | MostDerivedPathLength = Entries.size(); | ||||||
439 | } | ||||||
440 | void diagnoseUnsizedArrayPointerArithmetic(EvalInfo &Info, const Expr *E); | ||||||
441 | void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E, | ||||||
442 | const APSInt &N); | ||||||
443 | /// Add N to the address of this subobject. | ||||||
444 | void adjustIndex(EvalInfo &Info, const Expr *E, APSInt N) { | ||||||
445 | if (Invalid || !N) return; | ||||||
446 | uint64_t TruncatedN = N.extOrTrunc(64).getZExtValue(); | ||||||
447 | if (isMostDerivedAnUnsizedArray()) { | ||||||
448 | diagnoseUnsizedArrayPointerArithmetic(Info, E); | ||||||
449 | // Can't verify -- trust that the user is doing the right thing (or if | ||||||
450 | // not, trust that the caller will catch the bad behavior). | ||||||
451 | // FIXME: Should we reject if this overflows, at least? | ||||||
452 | Entries.back() = PathEntry::ArrayIndex( | ||||||
453 | Entries.back().getAsArrayIndex() + TruncatedN); | ||||||
454 | return; | ||||||
455 | } | ||||||
456 | |||||||
457 | // [expr.add]p4: For the purposes of these operators, a pointer to a | ||||||
458 | // nonarray object behaves the same as a pointer to the first element of | ||||||
459 | // an array of length one with the type of the object as its element type. | ||||||
460 | bool IsArray = MostDerivedPathLength == Entries.size() && | ||||||
461 | MostDerivedIsArrayElement; | ||||||
462 | uint64_t ArrayIndex = IsArray ? Entries.back().getAsArrayIndex() | ||||||
463 | : (uint64_t)IsOnePastTheEnd; | ||||||
464 | uint64_t ArraySize = | ||||||
465 | IsArray ? getMostDerivedArraySize() : (uint64_t)1; | ||||||
466 | |||||||
467 | if (N < -(int64_t)ArrayIndex || N > ArraySize - ArrayIndex) { | ||||||
468 | // Calculate the actual index in a wide enough type, so we can include | ||||||
469 | // it in the note. | ||||||
470 | N = N.extend(std::max<unsigned>(N.getBitWidth() + 1, 65)); | ||||||
471 | (llvm::APInt&)N += ArrayIndex; | ||||||
472 | assert(N.ugt(ArraySize) && "bounds check failed for in-bounds index")((N.ugt(ArraySize) && "bounds check failed for in-bounds index" ) ? static_cast<void> (0) : __assert_fail ("N.ugt(ArraySize) && \"bounds check failed for in-bounds index\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 472, __PRETTY_FUNCTION__)); | ||||||
473 | diagnosePointerArithmetic(Info, E, N); | ||||||
474 | setInvalid(); | ||||||
475 | return; | ||||||
476 | } | ||||||
477 | |||||||
478 | ArrayIndex += TruncatedN; | ||||||
479 | assert(ArrayIndex <= ArraySize &&((ArrayIndex <= ArraySize && "bounds check succeeded for out-of-bounds index" ) ? static_cast<void> (0) : __assert_fail ("ArrayIndex <= ArraySize && \"bounds check succeeded for out-of-bounds index\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 480, __PRETTY_FUNCTION__)) | ||||||
480 | "bounds check succeeded for out-of-bounds index")((ArrayIndex <= ArraySize && "bounds check succeeded for out-of-bounds index" ) ? static_cast<void> (0) : __assert_fail ("ArrayIndex <= ArraySize && \"bounds check succeeded for out-of-bounds index\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 480, __PRETTY_FUNCTION__)); | ||||||
481 | |||||||
482 | if (IsArray) | ||||||
483 | Entries.back() = PathEntry::ArrayIndex(ArrayIndex); | ||||||
484 | else | ||||||
485 | IsOnePastTheEnd = (ArrayIndex != 0); | ||||||
486 | } | ||||||
487 | }; | ||||||
488 | |||||||
489 | /// A stack frame in the constexpr call stack. | ||||||
490 | class CallStackFrame : public interp::Frame { | ||||||
491 | public: | ||||||
492 | EvalInfo &Info; | ||||||
493 | |||||||
494 | /// Parent - The caller of this stack frame. | ||||||
495 | CallStackFrame *Caller; | ||||||
496 | |||||||
497 | /// Callee - The function which was called. | ||||||
498 | const FunctionDecl *Callee; | ||||||
499 | |||||||
500 | /// This - The binding for the this pointer in this call, if any. | ||||||
501 | const LValue *This; | ||||||
502 | |||||||
503 | /// Arguments - Parameter bindings for this function call, indexed by | ||||||
504 | /// parameters' function scope indices. | ||||||
505 | APValue *Arguments; | ||||||
506 | |||||||
507 | /// Source location information about the default argument or default | ||||||
508 | /// initializer expression we're evaluating, if any. | ||||||
509 | CurrentSourceLocExprScope CurSourceLocExprScope; | ||||||
510 | |||||||
511 | // Note that we intentionally use std::map here so that references to | ||||||
512 | // values are stable. | ||||||
513 | typedef std::pair<const void *, unsigned> MapKeyTy; | ||||||
514 | typedef std::map<MapKeyTy, APValue> MapTy; | ||||||
515 | /// Temporaries - Temporary lvalues materialized within this stack frame. | ||||||
516 | MapTy Temporaries; | ||||||
517 | |||||||
518 | /// CallLoc - The location of the call expression for this call. | ||||||
519 | SourceLocation CallLoc; | ||||||
520 | |||||||
521 | /// Index - The call index of this call. | ||||||
522 | unsigned Index; | ||||||
523 | |||||||
524 | /// The stack of integers for tracking version numbers for temporaries. | ||||||
525 | SmallVector<unsigned, 2> TempVersionStack = {1}; | ||||||
526 | unsigned CurTempVersion = TempVersionStack.back(); | ||||||
527 | |||||||
528 | unsigned getTempVersion() const { return TempVersionStack.back(); } | ||||||
529 | |||||||
530 | void pushTempVersion() { | ||||||
531 | TempVersionStack.push_back(++CurTempVersion); | ||||||
532 | } | ||||||
533 | |||||||
534 | void popTempVersion() { | ||||||
535 | TempVersionStack.pop_back(); | ||||||
536 | } | ||||||
537 | |||||||
538 | // FIXME: Adding this to every 'CallStackFrame' may have a nontrivial impact | ||||||
539 | // on the overall stack usage of deeply-recursing constexpr evaluations. | ||||||
540 | // (We should cache this map rather than recomputing it repeatedly.) | ||||||
541 | // But let's try this and see how it goes; we can look into caching the map | ||||||
542 | // as a later change. | ||||||
543 | |||||||
544 | /// LambdaCaptureFields - Mapping from captured variables/this to | ||||||
545 | /// corresponding data members in the closure class. | ||||||
546 | llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields; | ||||||
547 | FieldDecl *LambdaThisCaptureField; | ||||||
548 | |||||||
549 | CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, | ||||||
550 | const FunctionDecl *Callee, const LValue *This, | ||||||
551 | APValue *Arguments); | ||||||
552 | ~CallStackFrame(); | ||||||
553 | |||||||
554 | // Return the temporary for Key whose version number is Version. | ||||||
555 | APValue *getTemporary(const void *Key, unsigned Version) { | ||||||
556 | MapKeyTy KV(Key, Version); | ||||||
557 | auto LB = Temporaries.lower_bound(KV); | ||||||
558 | if (LB != Temporaries.end() && LB->first == KV) | ||||||
559 | return &LB->second; | ||||||
560 | // Pair (Key,Version) wasn't found in the map. Check that no elements | ||||||
561 | // in the map have 'Key' as their key. | ||||||
562 | assert((LB == Temporaries.end() || LB->first.first != Key) &&(((LB == Temporaries.end() || LB->first.first != Key) && (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) && "Element with key 'Key' found in map") ? static_cast <void> (0) : __assert_fail ("(LB == Temporaries.end() || LB->first.first != Key) && (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) && \"Element with key 'Key' found in map\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 564, __PRETTY_FUNCTION__)) | ||||||
563 | (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) &&(((LB == Temporaries.end() || LB->first.first != Key) && (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) && "Element with key 'Key' found in map") ? static_cast <void> (0) : __assert_fail ("(LB == Temporaries.end() || LB->first.first != Key) && (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) && \"Element with key 'Key' found in map\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 564, __PRETTY_FUNCTION__)) | ||||||
564 | "Element with key 'Key' found in map")(((LB == Temporaries.end() || LB->first.first != Key) && (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) && "Element with key 'Key' found in map") ? static_cast <void> (0) : __assert_fail ("(LB == Temporaries.end() || LB->first.first != Key) && (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) && \"Element with key 'Key' found in map\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 564, __PRETTY_FUNCTION__)); | ||||||
565 | return nullptr; | ||||||
566 | } | ||||||
567 | |||||||
568 | // Return the current temporary for Key in the map. | ||||||
569 | APValue *getCurrentTemporary(const void *Key) { | ||||||
570 | auto UB = Temporaries.upper_bound(MapKeyTy(Key, UINT_MAX(2147483647 *2U +1U))); | ||||||
571 | if (UB != Temporaries.begin() && std::prev(UB)->first.first == Key) | ||||||
572 | return &std::prev(UB)->second; | ||||||
573 | return nullptr; | ||||||
574 | } | ||||||
575 | |||||||
576 | // Return the version number of the current temporary for Key. | ||||||
577 | unsigned getCurrentTemporaryVersion(const void *Key) const { | ||||||
578 | auto UB = Temporaries.upper_bound(MapKeyTy(Key, UINT_MAX(2147483647 *2U +1U))); | ||||||
579 | if (UB != Temporaries.begin() && std::prev(UB)->first.first == Key) | ||||||
580 | return std::prev(UB)->first.second; | ||||||
581 | return 0; | ||||||
582 | } | ||||||
583 | |||||||
584 | /// Allocate storage for an object of type T in this stack frame. | ||||||
585 | /// Populates LV with a handle to the created object. Key identifies | ||||||
586 | /// the temporary within the stack frame, and must not be reused without | ||||||
587 | /// bumping the temporary version number. | ||||||
588 | template<typename KeyT> | ||||||
589 | APValue &createTemporary(const KeyT *Key, QualType T, | ||||||
590 | bool IsLifetimeExtended, LValue &LV); | ||||||
591 | |||||||
592 | void describe(llvm::raw_ostream &OS) override; | ||||||
593 | |||||||
594 | Frame *getCaller() const override { return Caller; } | ||||||
595 | SourceLocation getCallLocation() const override { return CallLoc; } | ||||||
596 | const FunctionDecl *getCallee() const override { return Callee; } | ||||||
597 | }; | ||||||
598 | |||||||
599 | /// Temporarily override 'this'. | ||||||
600 | class ThisOverrideRAII { | ||||||
601 | public: | ||||||
602 | ThisOverrideRAII(CallStackFrame &Frame, const LValue *NewThis, bool Enable) | ||||||
603 | : Frame(Frame), OldThis(Frame.This) { | ||||||
604 | if (Enable) | ||||||
605 | Frame.This = NewThis; | ||||||
606 | } | ||||||
607 | ~ThisOverrideRAII() { | ||||||
608 | Frame.This = OldThis; | ||||||
609 | } | ||||||
610 | private: | ||||||
611 | CallStackFrame &Frame; | ||||||
612 | const LValue *OldThis; | ||||||
613 | }; | ||||||
614 | } | ||||||
615 | |||||||
616 | static bool HandleDestruction(EvalInfo &Info, const Expr *E, | ||||||
617 | const LValue &This, QualType ThisType); | ||||||
618 | static bool HandleDestruction(EvalInfo &Info, SourceLocation Loc, | ||||||
619 | APValue::LValueBase LVBase, APValue &Value, | ||||||
620 | QualType T); | ||||||
621 | |||||||
622 | namespace { | ||||||
623 | /// A cleanup, and a flag indicating whether it is lifetime-extended. | ||||||
624 | class Cleanup { | ||||||
625 | llvm::PointerIntPair<APValue*, 1, bool> Value; | ||||||
626 | APValue::LValueBase Base; | ||||||
627 | QualType T; | ||||||
628 | |||||||
629 | public: | ||||||
630 | Cleanup(APValue *Val, APValue::LValueBase Base, QualType T, | ||||||
631 | bool IsLifetimeExtended) | ||||||
632 | : Value(Val, IsLifetimeExtended), Base(Base), T(T) {} | ||||||
633 | |||||||
634 | bool isLifetimeExtended() const { return Value.getInt(); } | ||||||
635 | bool endLifetime(EvalInfo &Info, bool RunDestructors) { | ||||||
636 | if (RunDestructors) { | ||||||
637 | SourceLocation Loc; | ||||||
638 | if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) | ||||||
639 | Loc = VD->getLocation(); | ||||||
640 | else if (const Expr *E = Base.dyn_cast<const Expr*>()) | ||||||
641 | Loc = E->getExprLoc(); | ||||||
642 | return HandleDestruction(Info, Loc, Base, *Value.getPointer(), T); | ||||||
643 | } | ||||||
644 | *Value.getPointer() = APValue(); | ||||||
645 | return true; | ||||||
646 | } | ||||||
647 | |||||||
648 | bool hasSideEffect() { | ||||||
649 | return T.isDestructedType(); | ||||||
650 | } | ||||||
651 | }; | ||||||
652 | |||||||
653 | /// A reference to an object whose construction we are currently evaluating. | ||||||
654 | struct ObjectUnderConstruction { | ||||||
655 | APValue::LValueBase Base; | ||||||
656 | ArrayRef<APValue::LValuePathEntry> Path; | ||||||
657 | friend bool operator==(const ObjectUnderConstruction &LHS, | ||||||
658 | const ObjectUnderConstruction &RHS) { | ||||||
659 | return LHS.Base == RHS.Base && LHS.Path == RHS.Path; | ||||||
660 | } | ||||||
661 | friend llvm::hash_code hash_value(const ObjectUnderConstruction &Obj) { | ||||||
662 | return llvm::hash_combine(Obj.Base, Obj.Path); | ||||||
663 | } | ||||||
664 | }; | ||||||
665 | enum class ConstructionPhase { | ||||||
666 | None, | ||||||
667 | Bases, | ||||||
668 | AfterBases, | ||||||
669 | Destroying, | ||||||
670 | DestroyingBases | ||||||
671 | }; | ||||||
672 | } | ||||||
673 | |||||||
674 | namespace llvm { | ||||||
675 | template<> struct DenseMapInfo<ObjectUnderConstruction> { | ||||||
676 | using Base = DenseMapInfo<APValue::LValueBase>; | ||||||
677 | static ObjectUnderConstruction getEmptyKey() { | ||||||
678 | return {Base::getEmptyKey(), {}}; } | ||||||
679 | static ObjectUnderConstruction getTombstoneKey() { | ||||||
680 | return {Base::getTombstoneKey(), {}}; | ||||||
681 | } | ||||||
682 | static unsigned getHashValue(const ObjectUnderConstruction &Object) { | ||||||
683 | return hash_value(Object); | ||||||
684 | } | ||||||
685 | static bool isEqual(const ObjectUnderConstruction &LHS, | ||||||
686 | const ObjectUnderConstruction &RHS) { | ||||||
687 | return LHS == RHS; | ||||||
688 | } | ||||||
689 | }; | ||||||
690 | } | ||||||
691 | |||||||
692 | namespace { | ||||||
693 | /// EvalInfo - This is a private struct used by the evaluator to capture | ||||||
694 | /// information about a subexpression as it is folded. It retains information | ||||||
695 | /// about the AST context, but also maintains information about the folded | ||||||
696 | /// expression. | ||||||
697 | /// | ||||||
698 | /// If an expression could be evaluated, it is still possible it is not a C | ||||||
699 | /// "integer constant expression" or constant expression. If not, this struct | ||||||
700 | /// captures information about how and why not. | ||||||
701 | /// | ||||||
702 | /// One bit of information passed *into* the request for constant folding | ||||||
703 | /// indicates whether the subexpression is "evaluated" or not according to C | ||||||
704 | /// rules. For example, the RHS of (0 && foo()) is not evaluated. We can | ||||||
705 | /// evaluate the expression regardless of what the RHS is, but C only allows | ||||||
706 | /// certain things in certain situations. | ||||||
707 | class EvalInfo : public interp::State { | ||||||
708 | public: | ||||||
709 | ASTContext &Ctx; | ||||||
710 | |||||||
711 | /// EvalStatus - Contains information about the evaluation. | ||||||
712 | Expr::EvalStatus &EvalStatus; | ||||||
713 | |||||||
714 | /// CurrentCall - The top of the constexpr call stack. | ||||||
715 | CallStackFrame *CurrentCall; | ||||||
716 | |||||||
717 | /// CallStackDepth - The number of calls in the call stack right now. | ||||||
718 | unsigned CallStackDepth; | ||||||
719 | |||||||
720 | /// NextCallIndex - The next call index to assign. | ||||||
721 | unsigned NextCallIndex; | ||||||
722 | |||||||
723 | /// StepsLeft - The remaining number of evaluation steps we're permitted | ||||||
724 | /// to perform. This is essentially a limit for the number of statements | ||||||
725 | /// we will evaluate. | ||||||
726 | unsigned StepsLeft; | ||||||
727 | |||||||
728 | /// Force the use of the experimental new constant interpreter, bailing out | ||||||
729 | /// with an error if a feature is not supported. | ||||||
730 | bool ForceNewConstInterp; | ||||||
731 | |||||||
732 | /// Enable the experimental new constant interpreter. | ||||||
733 | bool EnableNewConstInterp; | ||||||
734 | |||||||
735 | /// BottomFrame - The frame in which evaluation started. This must be | ||||||
736 | /// initialized after CurrentCall and CallStackDepth. | ||||||
737 | CallStackFrame BottomFrame; | ||||||
738 | |||||||
739 | /// A stack of values whose lifetimes end at the end of some surrounding | ||||||
740 | /// evaluation frame. | ||||||
741 | llvm::SmallVector<Cleanup, 16> CleanupStack; | ||||||
742 | |||||||
743 | /// EvaluatingDecl - This is the declaration whose initializer is being | ||||||
744 | /// evaluated, if any. | ||||||
745 | APValue::LValueBase EvaluatingDecl; | ||||||
746 | |||||||
747 | enum class EvaluatingDeclKind { | ||||||
748 | None, | ||||||
749 | /// We're evaluating the construction of EvaluatingDecl. | ||||||
750 | Ctor, | ||||||
751 | /// We're evaluating the destruction of EvaluatingDecl. | ||||||
752 | Dtor, | ||||||
753 | }; | ||||||
754 | EvaluatingDeclKind IsEvaluatingDecl = EvaluatingDeclKind::None; | ||||||
755 | |||||||
756 | /// EvaluatingDeclValue - This is the value being constructed for the | ||||||
757 | /// declaration whose initializer is being evaluated, if any. | ||||||
758 | APValue *EvaluatingDeclValue; | ||||||
759 | |||||||
760 | /// Set of objects that are currently being constructed. | ||||||
761 | llvm::DenseMap<ObjectUnderConstruction, ConstructionPhase> | ||||||
762 | ObjectsUnderConstruction; | ||||||
763 | |||||||
764 | /// A dynamically-allocated heap object. | ||||||
765 | struct DynAlloc { | ||||||
766 | /// The value of this heap-allocated object. | ||||||
767 | APValue Value; | ||||||
768 | /// The allocating expression; used for diagnostics. | ||||||
769 | const Expr *AllocExpr = nullptr; | ||||||
770 | }; | ||||||
771 | |||||||
772 | struct DynAllocOrder { | ||||||
773 | bool operator()(DynamicAllocLValue L, DynamicAllocLValue R) const { | ||||||
774 | return L.getIndex() < R.getIndex(); | ||||||
775 | } | ||||||
776 | }; | ||||||
777 | |||||||
778 | /// Current heap allocations, along with the location where each was | ||||||
779 | /// allocated. We use std::map here because we need stable addresses | ||||||
780 | /// for the stored APValues. | ||||||
781 | std::map<DynamicAllocLValue, DynAlloc, DynAllocOrder> HeapAllocs; | ||||||
782 | |||||||
783 | /// The number of heap allocations performed so far in this evaluation. | ||||||
784 | unsigned NumHeapAllocs = 0; | ||||||
785 | |||||||
786 | struct EvaluatingConstructorRAII { | ||||||
787 | EvalInfo &EI; | ||||||
788 | ObjectUnderConstruction Object; | ||||||
789 | bool DidInsert; | ||||||
790 | EvaluatingConstructorRAII(EvalInfo &EI, ObjectUnderConstruction Object, | ||||||
791 | bool HasBases) | ||||||
792 | : EI(EI), Object(Object) { | ||||||
793 | DidInsert = | ||||||
794 | EI.ObjectsUnderConstruction | ||||||
795 | .insert({Object, HasBases ? ConstructionPhase::Bases | ||||||
796 | : ConstructionPhase::AfterBases}) | ||||||
797 | .second; | ||||||
798 | } | ||||||
799 | void finishedConstructingBases() { | ||||||
800 | EI.ObjectsUnderConstruction[Object] = ConstructionPhase::AfterBases; | ||||||
801 | } | ||||||
802 | ~EvaluatingConstructorRAII() { | ||||||
803 | if (DidInsert) EI.ObjectsUnderConstruction.erase(Object); | ||||||
804 | } | ||||||
805 | }; | ||||||
806 | |||||||
807 | struct EvaluatingDestructorRAII { | ||||||
808 | EvalInfo &EI; | ||||||
809 | ObjectUnderConstruction Object; | ||||||
810 | bool DidInsert; | ||||||
811 | EvaluatingDestructorRAII(EvalInfo &EI, ObjectUnderConstruction Object) | ||||||
812 | : EI(EI), Object(Object) { | ||||||
813 | DidInsert = EI.ObjectsUnderConstruction | ||||||
814 | .insert({Object, ConstructionPhase::Destroying}) | ||||||
815 | .second; | ||||||
816 | } | ||||||
817 | void startedDestroyingBases() { | ||||||
818 | EI.ObjectsUnderConstruction[Object] = | ||||||
819 | ConstructionPhase::DestroyingBases; | ||||||
820 | } | ||||||
821 | ~EvaluatingDestructorRAII() { | ||||||
822 | if (DidInsert) | ||||||
823 | EI.ObjectsUnderConstruction.erase(Object); | ||||||
824 | } | ||||||
825 | }; | ||||||
826 | |||||||
827 | ConstructionPhase | ||||||
828 | isEvaluatingCtorDtor(APValue::LValueBase Base, | ||||||
829 | ArrayRef<APValue::LValuePathEntry> Path) { | ||||||
830 | return ObjectsUnderConstruction.lookup({Base, Path}); | ||||||
831 | } | ||||||
832 | |||||||
833 | /// If we're currently speculatively evaluating, the outermost call stack | ||||||
834 | /// depth at which we can mutate state, otherwise 0. | ||||||
835 | unsigned SpeculativeEvaluationDepth = 0; | ||||||
836 | |||||||
837 | /// The current array initialization index, if we're performing array | ||||||
838 | /// initialization. | ||||||
839 | uint64_t ArrayInitIndex = -1; | ||||||
840 | |||||||
841 | /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further | ||||||
842 | /// notes attached to it will also be stored, otherwise they will not be. | ||||||
843 | bool HasActiveDiagnostic; | ||||||
844 | |||||||
845 | /// Have we emitted a diagnostic explaining why we couldn't constant | ||||||
846 | /// fold (not just why it's not strictly a constant expression)? | ||||||
847 | bool HasFoldFailureDiagnostic; | ||||||
848 | |||||||
849 | /// Whether or not we're in a context where the front end requires a | ||||||
850 | /// constant value. | ||||||
851 | bool InConstantContext; | ||||||
852 | |||||||
853 | /// Whether we're checking that an expression is a potential constant | ||||||
854 | /// expression. If so, do not fail on constructs that could become constant | ||||||
855 | /// later on (such as a use of an undefined global). | ||||||
856 | bool CheckingPotentialConstantExpression = false; | ||||||
857 | |||||||
858 | /// Whether we're checking for an expression that has undefined behavior. | ||||||
859 | /// If so, we will produce warnings if we encounter an operation that is | ||||||
860 | /// always undefined. | ||||||
861 | bool CheckingForUndefinedBehavior = false; | ||||||
862 | |||||||
863 | enum EvaluationMode { | ||||||
864 | /// Evaluate as a constant expression. Stop if we find that the expression | ||||||
865 | /// is not a constant expression. | ||||||
866 | EM_ConstantExpression, | ||||||
867 | |||||||
868 | /// Evaluate as a constant expression. Stop if we find that the expression | ||||||
869 | /// is not a constant expression. Some expressions can be retried in the | ||||||
870 | /// optimizer if we don't constant fold them here, but in an unevaluated | ||||||
871 | /// context we try to fold them immediately since the optimizer never | ||||||
872 | /// gets a chance to look at it. | ||||||
873 | EM_ConstantExpressionUnevaluated, | ||||||
874 | |||||||
875 | /// Fold the expression to a constant. Stop if we hit a side-effect that | ||||||
876 | /// we can't model. | ||||||
877 | EM_ConstantFold, | ||||||
878 | |||||||
879 | /// Evaluate in any way we know how. Don't worry about side-effects that | ||||||
880 | /// can't be modeled. | ||||||
881 | EM_IgnoreSideEffects, | ||||||
882 | } EvalMode; | ||||||
883 | |||||||
884 | /// Are we checking whether the expression is a potential constant | ||||||
885 | /// expression? | ||||||
886 | bool checkingPotentialConstantExpression() const override { | ||||||
887 | return CheckingPotentialConstantExpression; | ||||||
888 | } | ||||||
889 | |||||||
890 | /// Are we checking an expression for overflow? | ||||||
891 | // FIXME: We should check for any kind of undefined or suspicious behavior | ||||||
892 | // in such constructs, not just overflow. | ||||||
893 | bool checkingForUndefinedBehavior() const override { | ||||||
894 | return CheckingForUndefinedBehavior; | ||||||
895 | } | ||||||
896 | |||||||
897 | EvalInfo(const ASTContext &C, Expr::EvalStatus &S, EvaluationMode Mode) | ||||||
898 | : Ctx(const_cast<ASTContext &>(C)), EvalStatus(S), CurrentCall(nullptr), | ||||||
899 | CallStackDepth(0), NextCallIndex(1), | ||||||
900 | StepsLeft(getLangOpts().ConstexprStepLimit), | ||||||
901 | ForceNewConstInterp(getLangOpts().ForceNewConstInterp), | ||||||
902 | EnableNewConstInterp(ForceNewConstInterp || | ||||||
903 | getLangOpts().EnableNewConstInterp), | ||||||
904 | BottomFrame(*this, SourceLocation(), nullptr, nullptr, nullptr), | ||||||
905 | EvaluatingDecl((const ValueDecl *)nullptr), | ||||||
906 | EvaluatingDeclValue(nullptr), HasActiveDiagnostic(false), | ||||||
907 | HasFoldFailureDiagnostic(false), InConstantContext(false), | ||||||
908 | EvalMode(Mode) {} | ||||||
909 | |||||||
910 | ~EvalInfo() { | ||||||
911 | discardCleanups(); | ||||||
912 | } | ||||||
913 | |||||||
914 | void setEvaluatingDecl(APValue::LValueBase Base, APValue &Value, | ||||||
915 | EvaluatingDeclKind EDK = EvaluatingDeclKind::Ctor) { | ||||||
916 | EvaluatingDecl = Base; | ||||||
917 | IsEvaluatingDecl = EDK; | ||||||
918 | EvaluatingDeclValue = &Value; | ||||||
919 | } | ||||||
920 | |||||||
921 | bool CheckCallLimit(SourceLocation Loc) { | ||||||
922 | // Don't perform any constexpr calls (other than the call we're checking) | ||||||
923 | // when checking a potential constant expression. | ||||||
924 | if (checkingPotentialConstantExpression() && CallStackDepth > 1) | ||||||
925 | return false; | ||||||
926 | if (NextCallIndex == 0) { | ||||||
927 | // NextCallIndex has wrapped around. | ||||||
928 | FFDiag(Loc, diag::note_constexpr_call_limit_exceeded); | ||||||
929 | return false; | ||||||
930 | } | ||||||
931 | if (CallStackDepth <= getLangOpts().ConstexprCallDepth) | ||||||
932 | return true; | ||||||
933 | FFDiag(Loc, diag::note_constexpr_depth_limit_exceeded) | ||||||
934 | << getLangOpts().ConstexprCallDepth; | ||||||
935 | return false; | ||||||
936 | } | ||||||
937 | |||||||
938 | std::pair<CallStackFrame *, unsigned> | ||||||
939 | getCallFrameAndDepth(unsigned CallIndex) { | ||||||
940 | assert(CallIndex && "no call index in getCallFrameAndDepth")((CallIndex && "no call index in getCallFrameAndDepth" ) ? static_cast<void> (0) : __assert_fail ("CallIndex && \"no call index in getCallFrameAndDepth\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 940, __PRETTY_FUNCTION__)); | ||||||
941 | // We will eventually hit BottomFrame, which has Index 1, so Frame can't | ||||||
942 | // be null in this loop. | ||||||
943 | unsigned Depth = CallStackDepth; | ||||||
944 | CallStackFrame *Frame = CurrentCall; | ||||||
945 | while (Frame->Index > CallIndex) { | ||||||
946 | Frame = Frame->Caller; | ||||||
947 | --Depth; | ||||||
948 | } | ||||||
949 | if (Frame->Index == CallIndex) | ||||||
950 | return {Frame, Depth}; | ||||||
951 | return {nullptr, 0}; | ||||||
952 | } | ||||||
953 | |||||||
954 | bool nextStep(const Stmt *S) { | ||||||
955 | if (!StepsLeft) { | ||||||
956 | FFDiag(S->getBeginLoc(), diag::note_constexpr_step_limit_exceeded); | ||||||
957 | return false; | ||||||
958 | } | ||||||
959 | --StepsLeft; | ||||||
960 | return true; | ||||||
961 | } | ||||||
962 | |||||||
963 | APValue *createHeapAlloc(const Expr *E, QualType T, LValue &LV); | ||||||
964 | |||||||
965 | Optional<DynAlloc*> lookupDynamicAlloc(DynamicAllocLValue DA) { | ||||||
966 | Optional<DynAlloc*> Result; | ||||||
967 | auto It = HeapAllocs.find(DA); | ||||||
968 | if (It != HeapAllocs.end()) | ||||||
969 | Result = &It->second; | ||||||
970 | return Result; | ||||||
971 | } | ||||||
972 | |||||||
973 | void performLifetimeExtension() { | ||||||
974 | // Disable the cleanups for lifetime-extended temporaries. | ||||||
975 | CleanupStack.erase( | ||||||
976 | std::remove_if(CleanupStack.begin(), CleanupStack.end(), | ||||||
977 | [](Cleanup &C) { return C.isLifetimeExtended(); }), | ||||||
978 | CleanupStack.end()); | ||||||
979 | } | ||||||
980 | |||||||
981 | /// Throw away any remaining cleanups at the end of evaluation. If any | ||||||
982 | /// cleanups would have had a side-effect, note that as an unmodeled | ||||||
983 | /// side-effect and return false. Otherwise, return true. | ||||||
984 | bool discardCleanups() { | ||||||
985 | for (Cleanup &C : CleanupStack) | ||||||
986 | if (C.hasSideEffect()) | ||||||
987 | if (!noteSideEffect()) | ||||||
988 | return false; | ||||||
989 | return true; | ||||||
990 | } | ||||||
991 | |||||||
992 | private: | ||||||
993 | interp::Frame *getCurrentFrame() override { return CurrentCall; } | ||||||
994 | const interp::Frame *getBottomFrame() const override { return &BottomFrame; } | ||||||
995 | |||||||
996 | bool hasActiveDiagnostic() override { return HasActiveDiagnostic; } | ||||||
997 | void setActiveDiagnostic(bool Flag) override { HasActiveDiagnostic = Flag; } | ||||||
998 | |||||||
999 | void setFoldFailureDiagnostic(bool Flag) override { | ||||||
1000 | HasFoldFailureDiagnostic = Flag; | ||||||
1001 | } | ||||||
1002 | |||||||
1003 | Expr::EvalStatus &getEvalStatus() const override { return EvalStatus; } | ||||||
1004 | |||||||
1005 | ASTContext &getCtx() const override { return Ctx; } | ||||||
1006 | |||||||
1007 | // If we have a prior diagnostic, it will be noting that the expression | ||||||
1008 | // isn't a constant expression. This diagnostic is more important, | ||||||
1009 | // unless we require this evaluation to produce a constant expression. | ||||||
1010 | // | ||||||
1011 | // FIXME: We might want to show both diagnostics to the user in | ||||||
1012 | // EM_ConstantFold mode. | ||||||
1013 | bool hasPriorDiagnostic() override { | ||||||
1014 | if (!EvalStatus.Diag->empty()) { | ||||||
1015 | switch (EvalMode) { | ||||||
1016 | case EM_ConstantFold: | ||||||
1017 | case EM_IgnoreSideEffects: | ||||||
1018 | if (!HasFoldFailureDiagnostic) | ||||||
1019 | break; | ||||||
1020 | // We've already failed to fold something. Keep that diagnostic. | ||||||
1021 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||||
1022 | case EM_ConstantExpression: | ||||||
1023 | case EM_ConstantExpressionUnevaluated: | ||||||
1024 | setActiveDiagnostic(false); | ||||||
1025 | return true; | ||||||
1026 | } | ||||||
1027 | } | ||||||
1028 | return false; | ||||||
1029 | } | ||||||
1030 | |||||||
1031 | unsigned getCallStackDepth() override { return CallStackDepth; } | ||||||
1032 | |||||||
1033 | public: | ||||||
1034 | /// Should we continue evaluation after encountering a side-effect that we | ||||||
1035 | /// couldn't model? | ||||||
1036 | bool keepEvaluatingAfterSideEffect() { | ||||||
1037 | switch (EvalMode) { | ||||||
1038 | case EM_IgnoreSideEffects: | ||||||
1039 | return true; | ||||||
1040 | |||||||
1041 | case EM_ConstantExpression: | ||||||
1042 | case EM_ConstantExpressionUnevaluated: | ||||||
1043 | case EM_ConstantFold: | ||||||
1044 | // By default, assume any side effect might be valid in some other | ||||||
1045 | // evaluation of this expression from a different context. | ||||||
1046 | return checkingPotentialConstantExpression() || | ||||||
1047 | checkingForUndefinedBehavior(); | ||||||
1048 | } | ||||||
1049 | llvm_unreachable("Missed EvalMode case")::llvm::llvm_unreachable_internal("Missed EvalMode case", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1049); | ||||||
1050 | } | ||||||
1051 | |||||||
1052 | /// Note that we have had a side-effect, and determine whether we should | ||||||
1053 | /// keep evaluating. | ||||||
1054 | bool noteSideEffect() { | ||||||
1055 | EvalStatus.HasSideEffects = true; | ||||||
1056 | return keepEvaluatingAfterSideEffect(); | ||||||
1057 | } | ||||||
1058 | |||||||
1059 | /// Should we continue evaluation after encountering undefined behavior? | ||||||
1060 | bool keepEvaluatingAfterUndefinedBehavior() { | ||||||
1061 | switch (EvalMode) { | ||||||
1062 | case EM_IgnoreSideEffects: | ||||||
1063 | case EM_ConstantFold: | ||||||
1064 | return true; | ||||||
1065 | |||||||
1066 | case EM_ConstantExpression: | ||||||
1067 | case EM_ConstantExpressionUnevaluated: | ||||||
1068 | return checkingForUndefinedBehavior(); | ||||||
1069 | } | ||||||
1070 | llvm_unreachable("Missed EvalMode case")::llvm::llvm_unreachable_internal("Missed EvalMode case", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1070); | ||||||
1071 | } | ||||||
1072 | |||||||
1073 | /// Note that we hit something that was technically undefined behavior, but | ||||||
1074 | /// that we can evaluate past it (such as signed overflow or floating-point | ||||||
1075 | /// division by zero.) | ||||||
1076 | bool noteUndefinedBehavior() override { | ||||||
1077 | EvalStatus.HasUndefinedBehavior = true; | ||||||
1078 | return keepEvaluatingAfterUndefinedBehavior(); | ||||||
1079 | } | ||||||
1080 | |||||||
1081 | /// Should we continue evaluation as much as possible after encountering a | ||||||
1082 | /// construct which can't be reduced to a value? | ||||||
1083 | bool keepEvaluatingAfterFailure() const override { | ||||||
1084 | if (!StepsLeft) | ||||||
1085 | return false; | ||||||
1086 | |||||||
1087 | switch (EvalMode) { | ||||||
1088 | case EM_ConstantExpression: | ||||||
1089 | case EM_ConstantExpressionUnevaluated: | ||||||
1090 | case EM_ConstantFold: | ||||||
1091 | case EM_IgnoreSideEffects: | ||||||
1092 | return checkingPotentialConstantExpression() || | ||||||
1093 | checkingForUndefinedBehavior(); | ||||||
1094 | } | ||||||
1095 | llvm_unreachable("Missed EvalMode case")::llvm::llvm_unreachable_internal("Missed EvalMode case", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1095); | ||||||
1096 | } | ||||||
1097 | |||||||
1098 | /// Notes that we failed to evaluate an expression that other expressions | ||||||
1099 | /// directly depend on, and determine if we should keep evaluating. This | ||||||
1100 | /// should only be called if we actually intend to keep evaluating. | ||||||
1101 | /// | ||||||
1102 | /// Call noteSideEffect() instead if we may be able to ignore the value that | ||||||
1103 | /// we failed to evaluate, e.g. if we failed to evaluate Foo() in: | ||||||
1104 | /// | ||||||
1105 | /// (Foo(), 1) // use noteSideEffect | ||||||
1106 | /// (Foo() || true) // use noteSideEffect | ||||||
1107 | /// Foo() + 1 // use noteFailure | ||||||
1108 | LLVM_NODISCARD[[clang::warn_unused_result]] bool noteFailure() { | ||||||
1109 | // Failure when evaluating some expression often means there is some | ||||||
1110 | // subexpression whose evaluation was skipped. Therefore, (because we | ||||||
1111 | // don't track whether we skipped an expression when unwinding after an | ||||||
1112 | // evaluation failure) every evaluation failure that bubbles up from a | ||||||
1113 | // subexpression implies that a side-effect has potentially happened. We | ||||||
1114 | // skip setting the HasSideEffects flag to true until we decide to | ||||||
1115 | // continue evaluating after that point, which happens here. | ||||||
1116 | bool KeepGoing = keepEvaluatingAfterFailure(); | ||||||
1117 | EvalStatus.HasSideEffects |= KeepGoing; | ||||||
1118 | return KeepGoing; | ||||||
1119 | } | ||||||
1120 | |||||||
1121 | class ArrayInitLoopIndex { | ||||||
1122 | EvalInfo &Info; | ||||||
1123 | uint64_t OuterIndex; | ||||||
1124 | |||||||
1125 | public: | ||||||
1126 | ArrayInitLoopIndex(EvalInfo &Info) | ||||||
1127 | : Info(Info), OuterIndex(Info.ArrayInitIndex) { | ||||||
1128 | Info.ArrayInitIndex = 0; | ||||||
1129 | } | ||||||
1130 | ~ArrayInitLoopIndex() { Info.ArrayInitIndex = OuterIndex; } | ||||||
1131 | |||||||
1132 | operator uint64_t&() { return Info.ArrayInitIndex; } | ||||||
1133 | }; | ||||||
1134 | }; | ||||||
1135 | |||||||
1136 | /// Object used to treat all foldable expressions as constant expressions. | ||||||
1137 | struct FoldConstant { | ||||||
1138 | EvalInfo &Info; | ||||||
1139 | bool Enabled; | ||||||
1140 | bool HadNoPriorDiags; | ||||||
1141 | EvalInfo::EvaluationMode OldMode; | ||||||
1142 | |||||||
1143 | explicit FoldConstant(EvalInfo &Info, bool Enabled) | ||||||
1144 | : Info(Info), | ||||||
1145 | Enabled(Enabled), | ||||||
1146 | HadNoPriorDiags(Info.EvalStatus.Diag && | ||||||
1147 | Info.EvalStatus.Diag->empty() && | ||||||
1148 | !Info.EvalStatus.HasSideEffects), | ||||||
1149 | OldMode(Info.EvalMode) { | ||||||
1150 | if (Enabled) | ||||||
1151 | Info.EvalMode = EvalInfo::EM_ConstantFold; | ||||||
1152 | } | ||||||
1153 | void keepDiagnostics() { Enabled = false; } | ||||||
1154 | ~FoldConstant() { | ||||||
1155 | if (Enabled && HadNoPriorDiags && !Info.EvalStatus.Diag->empty() && | ||||||
1156 | !Info.EvalStatus.HasSideEffects) | ||||||
1157 | Info.EvalStatus.Diag->clear(); | ||||||
1158 | Info.EvalMode = OldMode; | ||||||
1159 | } | ||||||
1160 | }; | ||||||
1161 | |||||||
1162 | /// RAII object used to set the current evaluation mode to ignore | ||||||
1163 | /// side-effects. | ||||||
1164 | struct IgnoreSideEffectsRAII { | ||||||
1165 | EvalInfo &Info; | ||||||
1166 | EvalInfo::EvaluationMode OldMode; | ||||||
1167 | explicit IgnoreSideEffectsRAII(EvalInfo &Info) | ||||||
1168 | : Info(Info), OldMode(Info.EvalMode) { | ||||||
1169 | Info.EvalMode = EvalInfo::EM_IgnoreSideEffects; | ||||||
1170 | } | ||||||
1171 | |||||||
1172 | ~IgnoreSideEffectsRAII() { Info.EvalMode = OldMode; } | ||||||
1173 | }; | ||||||
1174 | |||||||
1175 | /// RAII object used to optionally suppress diagnostics and side-effects from | ||||||
1176 | /// a speculative evaluation. | ||||||
1177 | class SpeculativeEvaluationRAII { | ||||||
1178 | EvalInfo *Info = nullptr; | ||||||
1179 | Expr::EvalStatus OldStatus; | ||||||
1180 | unsigned OldSpeculativeEvaluationDepth; | ||||||
1181 | |||||||
1182 | void moveFromAndCancel(SpeculativeEvaluationRAII &&Other) { | ||||||
1183 | Info = Other.Info; | ||||||
1184 | OldStatus = Other.OldStatus; | ||||||
1185 | OldSpeculativeEvaluationDepth = Other.OldSpeculativeEvaluationDepth; | ||||||
1186 | Other.Info = nullptr; | ||||||
1187 | } | ||||||
1188 | |||||||
1189 | void maybeRestoreState() { | ||||||
1190 | if (!Info) | ||||||
1191 | return; | ||||||
1192 | |||||||
1193 | Info->EvalStatus = OldStatus; | ||||||
1194 | Info->SpeculativeEvaluationDepth = OldSpeculativeEvaluationDepth; | ||||||
1195 | } | ||||||
1196 | |||||||
1197 | public: | ||||||
1198 | SpeculativeEvaluationRAII() = default; | ||||||
1199 | |||||||
1200 | SpeculativeEvaluationRAII( | ||||||
1201 | EvalInfo &Info, SmallVectorImpl<PartialDiagnosticAt> *NewDiag = nullptr) | ||||||
1202 | : Info(&Info), OldStatus(Info.EvalStatus), | ||||||
1203 | OldSpeculativeEvaluationDepth(Info.SpeculativeEvaluationDepth) { | ||||||
1204 | Info.EvalStatus.Diag = NewDiag; | ||||||
1205 | Info.SpeculativeEvaluationDepth = Info.CallStackDepth + 1; | ||||||
1206 | } | ||||||
1207 | |||||||
1208 | SpeculativeEvaluationRAII(const SpeculativeEvaluationRAII &Other) = delete; | ||||||
1209 | SpeculativeEvaluationRAII(SpeculativeEvaluationRAII &&Other) { | ||||||
1210 | moveFromAndCancel(std::move(Other)); | ||||||
1211 | } | ||||||
1212 | |||||||
1213 | SpeculativeEvaluationRAII &operator=(SpeculativeEvaluationRAII &&Other) { | ||||||
1214 | maybeRestoreState(); | ||||||
1215 | moveFromAndCancel(std::move(Other)); | ||||||
1216 | return *this; | ||||||
1217 | } | ||||||
1218 | |||||||
1219 | ~SpeculativeEvaluationRAII() { maybeRestoreState(); } | ||||||
1220 | }; | ||||||
1221 | |||||||
1222 | /// RAII object wrapping a full-expression or block scope, and handling | ||||||
1223 | /// the ending of the lifetime of temporaries created within it. | ||||||
1224 | template<bool IsFullExpression> | ||||||
1225 | class ScopeRAII { | ||||||
1226 | EvalInfo &Info; | ||||||
1227 | unsigned OldStackSize; | ||||||
1228 | public: | ||||||
1229 | ScopeRAII(EvalInfo &Info) | ||||||
1230 | : Info(Info), OldStackSize(Info.CleanupStack.size()) { | ||||||
1231 | // Push a new temporary version. This is needed to distinguish between | ||||||
1232 | // temporaries created in different iterations of a loop. | ||||||
1233 | Info.CurrentCall->pushTempVersion(); | ||||||
1234 | } | ||||||
1235 | bool destroy(bool RunDestructors = true) { | ||||||
1236 | bool OK = cleanup(Info, RunDestructors, OldStackSize); | ||||||
1237 | OldStackSize = -1U; | ||||||
1238 | return OK; | ||||||
1239 | } | ||||||
1240 | ~ScopeRAII() { | ||||||
1241 | if (OldStackSize != -1U) | ||||||
1242 | destroy(false); | ||||||
1243 | // Body moved to a static method to encourage the compiler to inline away | ||||||
1244 | // instances of this class. | ||||||
1245 | Info.CurrentCall->popTempVersion(); | ||||||
1246 | } | ||||||
1247 | private: | ||||||
1248 | static bool cleanup(EvalInfo &Info, bool RunDestructors, | ||||||
1249 | unsigned OldStackSize) { | ||||||
1250 | assert(OldStackSize <= Info.CleanupStack.size() &&((OldStackSize <= Info.CleanupStack.size() && "running cleanups out of order?" ) ? static_cast<void> (0) : __assert_fail ("OldStackSize <= Info.CleanupStack.size() && \"running cleanups out of order?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1251, __PRETTY_FUNCTION__)) | ||||||
1251 | "running cleanups out of order?")((OldStackSize <= Info.CleanupStack.size() && "running cleanups out of order?" ) ? static_cast<void> (0) : __assert_fail ("OldStackSize <= Info.CleanupStack.size() && \"running cleanups out of order?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1251, __PRETTY_FUNCTION__)); | ||||||
1252 | |||||||
1253 | // Run all cleanups for a block scope, and non-lifetime-extended cleanups | ||||||
1254 | // for a full-expression scope. | ||||||
1255 | bool Success = true; | ||||||
1256 | for (unsigned I = Info.CleanupStack.size(); I > OldStackSize; --I) { | ||||||
1257 | if (!(IsFullExpression && | ||||||
1258 | Info.CleanupStack[I - 1].isLifetimeExtended())) { | ||||||
1259 | if (!Info.CleanupStack[I - 1].endLifetime(Info, RunDestructors)) { | ||||||
1260 | Success = false; | ||||||
1261 | break; | ||||||
1262 | } | ||||||
1263 | } | ||||||
1264 | } | ||||||
1265 | |||||||
1266 | // Compact lifetime-extended cleanups. | ||||||
1267 | auto NewEnd = Info.CleanupStack.begin() + OldStackSize; | ||||||
1268 | if (IsFullExpression) | ||||||
1269 | NewEnd = | ||||||
1270 | std::remove_if(NewEnd, Info.CleanupStack.end(), | ||||||
1271 | [](Cleanup &C) { return !C.isLifetimeExtended(); }); | ||||||
1272 | Info.CleanupStack.erase(NewEnd, Info.CleanupStack.end()); | ||||||
1273 | return Success; | ||||||
1274 | } | ||||||
1275 | }; | ||||||
1276 | typedef ScopeRAII<false> BlockScopeRAII; | ||||||
1277 | typedef ScopeRAII<true> FullExpressionRAII; | ||||||
1278 | } | ||||||
1279 | |||||||
1280 | bool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, | ||||||
1281 | CheckSubobjectKind CSK) { | ||||||
1282 | if (Invalid) | ||||||
1283 | return false; | ||||||
1284 | if (isOnePastTheEnd()) { | ||||||
1285 | Info.CCEDiag(E, diag::note_constexpr_past_end_subobject) | ||||||
1286 | << CSK; | ||||||
1287 | setInvalid(); | ||||||
1288 | return false; | ||||||
1289 | } | ||||||
1290 | // Note, we do not diagnose if isMostDerivedAnUnsizedArray(), because there | ||||||
1291 | // must actually be at least one array element; even a VLA cannot have a | ||||||
1292 | // bound of zero. And if our index is nonzero, we already had a CCEDiag. | ||||||
1293 | return true; | ||||||
1294 | } | ||||||
1295 | |||||||
1296 | void SubobjectDesignator::diagnoseUnsizedArrayPointerArithmetic(EvalInfo &Info, | ||||||
1297 | const Expr *E) { | ||||||
1298 | Info.CCEDiag(E, diag::note_constexpr_unsized_array_indexed); | ||||||
1299 | // Do not set the designator as invalid: we can represent this situation, | ||||||
1300 | // and correct handling of __builtin_object_size requires us to do so. | ||||||
1301 | } | ||||||
1302 | |||||||
1303 | void SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, | ||||||
1304 | const Expr *E, | ||||||
1305 | const APSInt &N) { | ||||||
1306 | // If we're complaining, we must be able to statically determine the size of | ||||||
1307 | // the most derived array. | ||||||
1308 | if (MostDerivedPathLength == Entries.size() && MostDerivedIsArrayElement) | ||||||
1309 | Info.CCEDiag(E, diag::note_constexpr_array_index) | ||||||
1310 | << N << /*array*/ 0 | ||||||
1311 | << static_cast<unsigned>(getMostDerivedArraySize()); | ||||||
1312 | else | ||||||
1313 | Info.CCEDiag(E, diag::note_constexpr_array_index) | ||||||
1314 | << N << /*non-array*/ 1; | ||||||
1315 | setInvalid(); | ||||||
1316 | } | ||||||
1317 | |||||||
1318 | CallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, | ||||||
1319 | const FunctionDecl *Callee, const LValue *This, | ||||||
1320 | APValue *Arguments) | ||||||
1321 | : Info(Info), Caller(Info.CurrentCall), Callee(Callee), This(This), | ||||||
1322 | Arguments(Arguments), CallLoc(CallLoc), Index(Info.NextCallIndex++) { | ||||||
1323 | Info.CurrentCall = this; | ||||||
1324 | ++Info.CallStackDepth; | ||||||
1325 | } | ||||||
1326 | |||||||
1327 | CallStackFrame::~CallStackFrame() { | ||||||
1328 | assert(Info.CurrentCall == this && "calls retired out of order")((Info.CurrentCall == this && "calls retired out of order" ) ? static_cast<void> (0) : __assert_fail ("Info.CurrentCall == this && \"calls retired out of order\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1328, __PRETTY_FUNCTION__)); | ||||||
1329 | --Info.CallStackDepth; | ||||||
1330 | Info.CurrentCall = Caller; | ||||||
1331 | } | ||||||
1332 | |||||||
1333 | static bool isRead(AccessKinds AK) { | ||||||
1334 | return AK == AK_Read || AK == AK_ReadObjectRepresentation; | ||||||
1335 | } | ||||||
1336 | |||||||
1337 | static bool isModification(AccessKinds AK) { | ||||||
1338 | switch (AK) { | ||||||
1339 | case AK_Read: | ||||||
1340 | case AK_ReadObjectRepresentation: | ||||||
1341 | case AK_MemberCall: | ||||||
1342 | case AK_DynamicCast: | ||||||
1343 | case AK_TypeId: | ||||||
1344 | return false; | ||||||
1345 | case AK_Assign: | ||||||
1346 | case AK_Increment: | ||||||
1347 | case AK_Decrement: | ||||||
1348 | case AK_Destroy: | ||||||
1349 | return true; | ||||||
1350 | } | ||||||
1351 | llvm_unreachable("unknown access kind")::llvm::llvm_unreachable_internal("unknown access kind", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1351); | ||||||
1352 | } | ||||||
1353 | |||||||
1354 | static bool isAnyAccess(AccessKinds AK) { | ||||||
1355 | return isRead(AK) || isModification(AK); | ||||||
1356 | } | ||||||
1357 | |||||||
1358 | /// Is this an access per the C++ definition? | ||||||
1359 | static bool isFormalAccess(AccessKinds AK) { | ||||||
1360 | return isAnyAccess(AK) && AK != AK_Destroy; | ||||||
1361 | } | ||||||
1362 | |||||||
1363 | namespace { | ||||||
1364 | struct ComplexValue { | ||||||
1365 | private: | ||||||
1366 | bool IsInt; | ||||||
1367 | |||||||
1368 | public: | ||||||
1369 | APSInt IntReal, IntImag; | ||||||
1370 | APFloat FloatReal, FloatImag; | ||||||
1371 | |||||||
1372 | ComplexValue() : FloatReal(APFloat::Bogus()), FloatImag(APFloat::Bogus()) {} | ||||||
1373 | |||||||
1374 | void makeComplexFloat() { IsInt = false; } | ||||||
1375 | bool isComplexFloat() const { return !IsInt; } | ||||||
1376 | APFloat &getComplexFloatReal() { return FloatReal; } | ||||||
1377 | APFloat &getComplexFloatImag() { return FloatImag; } | ||||||
1378 | |||||||
1379 | void makeComplexInt() { IsInt = true; } | ||||||
1380 | bool isComplexInt() const { return IsInt; } | ||||||
1381 | APSInt &getComplexIntReal() { return IntReal; } | ||||||
1382 | APSInt &getComplexIntImag() { return IntImag; } | ||||||
1383 | |||||||
1384 | void moveInto(APValue &v) const { | ||||||
1385 | if (isComplexFloat()) | ||||||
1386 | v = APValue(FloatReal, FloatImag); | ||||||
1387 | else | ||||||
1388 | v = APValue(IntReal, IntImag); | ||||||
1389 | } | ||||||
1390 | void setFrom(const APValue &v) { | ||||||
1391 | assert(v.isComplexFloat() || v.isComplexInt())((v.isComplexFloat() || v.isComplexInt()) ? static_cast<void > (0) : __assert_fail ("v.isComplexFloat() || v.isComplexInt()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1391, __PRETTY_FUNCTION__)); | ||||||
1392 | if (v.isComplexFloat()) { | ||||||
1393 | makeComplexFloat(); | ||||||
1394 | FloatReal = v.getComplexFloatReal(); | ||||||
1395 | FloatImag = v.getComplexFloatImag(); | ||||||
1396 | } else { | ||||||
1397 | makeComplexInt(); | ||||||
1398 | IntReal = v.getComplexIntReal(); | ||||||
1399 | IntImag = v.getComplexIntImag(); | ||||||
1400 | } | ||||||
1401 | } | ||||||
1402 | }; | ||||||
1403 | |||||||
1404 | struct LValue { | ||||||
1405 | APValue::LValueBase Base; | ||||||
1406 | CharUnits Offset; | ||||||
1407 | SubobjectDesignator Designator; | ||||||
1408 | bool IsNullPtr : 1; | ||||||
1409 | bool InvalidBase : 1; | ||||||
1410 | |||||||
1411 | const APValue::LValueBase getLValueBase() const { return Base; } | ||||||
1412 | CharUnits &getLValueOffset() { return Offset; } | ||||||
1413 | const CharUnits &getLValueOffset() const { return Offset; } | ||||||
1414 | SubobjectDesignator &getLValueDesignator() { return Designator; } | ||||||
1415 | const SubobjectDesignator &getLValueDesignator() const { return Designator;} | ||||||
1416 | bool isNullPointer() const { return IsNullPtr;} | ||||||
1417 | |||||||
1418 | unsigned getLValueCallIndex() const { return Base.getCallIndex(); } | ||||||
1419 | unsigned getLValueVersion() const { return Base.getVersion(); } | ||||||
1420 | |||||||
1421 | void moveInto(APValue &V) const { | ||||||
1422 | if (Designator.Invalid) | ||||||
1423 | V = APValue(Base, Offset, APValue::NoLValuePath(), IsNullPtr); | ||||||
1424 | else { | ||||||
1425 | assert(!InvalidBase && "APValues can't handle invalid LValue bases")((!InvalidBase && "APValues can't handle invalid LValue bases" ) ? static_cast<void> (0) : __assert_fail ("!InvalidBase && \"APValues can't handle invalid LValue bases\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1425, __PRETTY_FUNCTION__)); | ||||||
1426 | V = APValue(Base, Offset, Designator.Entries, | ||||||
1427 | Designator.IsOnePastTheEnd, IsNullPtr); | ||||||
1428 | } | ||||||
1429 | } | ||||||
1430 | void setFrom(ASTContext &Ctx, const APValue &V) { | ||||||
1431 | assert(V.isLValue() && "Setting LValue from a non-LValue?")((V.isLValue() && "Setting LValue from a non-LValue?" ) ? static_cast<void> (0) : __assert_fail ("V.isLValue() && \"Setting LValue from a non-LValue?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1431, __PRETTY_FUNCTION__)); | ||||||
1432 | Base = V.getLValueBase(); | ||||||
1433 | Offset = V.getLValueOffset(); | ||||||
1434 | InvalidBase = false; | ||||||
1435 | Designator = SubobjectDesignator(Ctx, V); | ||||||
1436 | IsNullPtr = V.isNullPointer(); | ||||||
1437 | } | ||||||
1438 | |||||||
1439 | void set(APValue::LValueBase B, bool BInvalid = false) { | ||||||
1440 | #ifndef NDEBUG | ||||||
1441 | // We only allow a few types of invalid bases. Enforce that here. | ||||||
1442 | if (BInvalid) { | ||||||
1443 | const auto *E = B.get<const Expr *>(); | ||||||
1444 | assert((isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) &&(((isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) && "Unexpected type of invalid base") ? static_cast<void> (0) : __assert_fail ("(isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) && \"Unexpected type of invalid base\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1445, __PRETTY_FUNCTION__)) | ||||||
1445 | "Unexpected type of invalid base")(((isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) && "Unexpected type of invalid base") ? static_cast<void> (0) : __assert_fail ("(isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) && \"Unexpected type of invalid base\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1445, __PRETTY_FUNCTION__)); | ||||||
1446 | } | ||||||
1447 | #endif | ||||||
1448 | |||||||
1449 | Base = B; | ||||||
1450 | Offset = CharUnits::fromQuantity(0); | ||||||
1451 | InvalidBase = BInvalid; | ||||||
1452 | Designator = SubobjectDesignator(getType(B)); | ||||||
1453 | IsNullPtr = false; | ||||||
1454 | } | ||||||
1455 | |||||||
1456 | void setNull(QualType PointerTy, uint64_t TargetVal) { | ||||||
1457 | Base = (Expr *)nullptr; | ||||||
1458 | Offset = CharUnits::fromQuantity(TargetVal); | ||||||
1459 | InvalidBase = false; | ||||||
1460 | Designator = SubobjectDesignator(PointerTy->getPointeeType()); | ||||||
1461 | IsNullPtr = true; | ||||||
1462 | } | ||||||
1463 | |||||||
1464 | void setInvalid(APValue::LValueBase B, unsigned I = 0) { | ||||||
1465 | set(B, true); | ||||||
1466 | } | ||||||
1467 | |||||||
1468 | private: | ||||||
1469 | // Check that this LValue is not based on a null pointer. If it is, produce | ||||||
1470 | // a diagnostic and mark the designator as invalid. | ||||||
1471 | template <typename GenDiagType> | ||||||
1472 | bool checkNullPointerDiagnosingWith(const GenDiagType &GenDiag) { | ||||||
1473 | if (Designator.Invalid) | ||||||
1474 | return false; | ||||||
1475 | if (IsNullPtr) { | ||||||
1476 | GenDiag(); | ||||||
1477 | Designator.setInvalid(); | ||||||
1478 | return false; | ||||||
1479 | } | ||||||
1480 | return true; | ||||||
1481 | } | ||||||
1482 | |||||||
1483 | public: | ||||||
1484 | bool checkNullPointer(EvalInfo &Info, const Expr *E, | ||||||
1485 | CheckSubobjectKind CSK) { | ||||||
1486 | return checkNullPointerDiagnosingWith([&Info, E, CSK] { | ||||||
1487 | Info.CCEDiag(E, diag::note_constexpr_null_subobject) << CSK; | ||||||
1488 | }); | ||||||
1489 | } | ||||||
1490 | |||||||
1491 | bool checkNullPointerForFoldAccess(EvalInfo &Info, const Expr *E, | ||||||
1492 | AccessKinds AK) { | ||||||
1493 | return checkNullPointerDiagnosingWith([&Info, E, AK] { | ||||||
1494 | Info.FFDiag(E, diag::note_constexpr_access_null) << AK; | ||||||
1495 | }); | ||||||
1496 | } | ||||||
1497 | |||||||
1498 | // Check this LValue refers to an object. If not, set the designator to be | ||||||
1499 | // invalid and emit a diagnostic. | ||||||
1500 | bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { | ||||||
1501 | return (CSK == CSK_ArrayToPointer || checkNullPointer(Info, E, CSK)) && | ||||||
1502 | Designator.checkSubobject(Info, E, CSK); | ||||||
1503 | } | ||||||
1504 | |||||||
1505 | void addDecl(EvalInfo &Info, const Expr *E, | ||||||
1506 | const Decl *D, bool Virtual = false) { | ||||||
1507 | if (checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base)) | ||||||
1508 | Designator.addDeclUnchecked(D, Virtual); | ||||||
1509 | } | ||||||
1510 | void addUnsizedArray(EvalInfo &Info, const Expr *E, QualType ElemTy) { | ||||||
1511 | if (!Designator.Entries.empty()) { | ||||||
1512 | Info.CCEDiag(E, diag::note_constexpr_unsupported_unsized_array); | ||||||
1513 | Designator.setInvalid(); | ||||||
1514 | return; | ||||||
1515 | } | ||||||
1516 | if (checkSubobject(Info, E, CSK_ArrayToPointer)) { | ||||||
1517 | assert(getType(Base)->isPointerType() || getType(Base)->isArrayType())((getType(Base)->isPointerType() || getType(Base)->isArrayType ()) ? static_cast<void> (0) : __assert_fail ("getType(Base)->isPointerType() || getType(Base)->isArrayType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1517, __PRETTY_FUNCTION__)); | ||||||
1518 | Designator.FirstEntryIsAnUnsizedArray = true; | ||||||
1519 | Designator.addUnsizedArrayUnchecked(ElemTy); | ||||||
1520 | } | ||||||
1521 | } | ||||||
1522 | void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { | ||||||
1523 | if (checkSubobject(Info, E, CSK_ArrayToPointer)) | ||||||
1524 | Designator.addArrayUnchecked(CAT); | ||||||
1525 | } | ||||||
1526 | void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) { | ||||||
1527 | if (checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real)) | ||||||
1528 | Designator.addComplexUnchecked(EltTy, Imag); | ||||||
1529 | } | ||||||
1530 | void clearIsNullPointer() { | ||||||
1531 | IsNullPtr = false; | ||||||
1532 | } | ||||||
1533 | void adjustOffsetAndIndex(EvalInfo &Info, const Expr *E, | ||||||
1534 | const APSInt &Index, CharUnits ElementSize) { | ||||||
1535 | // An index of 0 has no effect. (In C, adding 0 to a null pointer is UB, | ||||||
1536 | // but we're not required to diagnose it and it's valid in C++.) | ||||||
1537 | if (!Index) | ||||||
1538 | return; | ||||||
1539 | |||||||
1540 | // Compute the new offset in the appropriate width, wrapping at 64 bits. | ||||||
1541 | // FIXME: When compiling for a 32-bit target, we should use 32-bit | ||||||
1542 | // offsets. | ||||||
1543 | uint64_t Offset64 = Offset.getQuantity(); | ||||||
1544 | uint64_t ElemSize64 = ElementSize.getQuantity(); | ||||||
1545 | uint64_t Index64 = Index.extOrTrunc(64).getZExtValue(); | ||||||
1546 | Offset = CharUnits::fromQuantity(Offset64 + ElemSize64 * Index64); | ||||||
1547 | |||||||
1548 | if (checkNullPointer(Info, E, CSK_ArrayIndex)) | ||||||
1549 | Designator.adjustIndex(Info, E, Index); | ||||||
1550 | clearIsNullPointer(); | ||||||
1551 | } | ||||||
1552 | void adjustOffset(CharUnits N) { | ||||||
1553 | Offset += N; | ||||||
1554 | if (N.getQuantity()) | ||||||
1555 | clearIsNullPointer(); | ||||||
1556 | } | ||||||
1557 | }; | ||||||
1558 | |||||||
1559 | struct MemberPtr { | ||||||
1560 | MemberPtr() {} | ||||||
1561 | explicit MemberPtr(const ValueDecl *Decl) : | ||||||
1562 | DeclAndIsDerivedMember(Decl, false), Path() {} | ||||||
1563 | |||||||
1564 | /// The member or (direct or indirect) field referred to by this member | ||||||
1565 | /// pointer, or 0 if this is a null member pointer. | ||||||
1566 | const ValueDecl *getDecl() const { | ||||||
1567 | return DeclAndIsDerivedMember.getPointer(); | ||||||
1568 | } | ||||||
1569 | /// Is this actually a member of some type derived from the relevant class? | ||||||
1570 | bool isDerivedMember() const { | ||||||
1571 | return DeclAndIsDerivedMember.getInt(); | ||||||
1572 | } | ||||||
1573 | /// Get the class which the declaration actually lives in. | ||||||
1574 | const CXXRecordDecl *getContainingRecord() const { | ||||||
1575 | return cast<CXXRecordDecl>( | ||||||
1576 | DeclAndIsDerivedMember.getPointer()->getDeclContext()); | ||||||
1577 | } | ||||||
1578 | |||||||
1579 | void moveInto(APValue &V) const { | ||||||
1580 | V = APValue(getDecl(), isDerivedMember(), Path); | ||||||
1581 | } | ||||||
1582 | void setFrom(const APValue &V) { | ||||||
1583 | assert(V.isMemberPointer())((V.isMemberPointer()) ? static_cast<void> (0) : __assert_fail ("V.isMemberPointer()", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1583, __PRETTY_FUNCTION__)); | ||||||
1584 | DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); | ||||||
1585 | DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); | ||||||
1586 | Path.clear(); | ||||||
1587 | ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); | ||||||
1588 | Path.insert(Path.end(), P.begin(), P.end()); | ||||||
1589 | } | ||||||
1590 | |||||||
1591 | /// DeclAndIsDerivedMember - The member declaration, and a flag indicating | ||||||
1592 | /// whether the member is a member of some class derived from the class type | ||||||
1593 | /// of the member pointer. | ||||||
1594 | llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; | ||||||
1595 | /// Path - The path of base/derived classes from the member declaration's | ||||||
1596 | /// class (exclusive) to the class type of the member pointer (inclusive). | ||||||
1597 | SmallVector<const CXXRecordDecl*, 4> Path; | ||||||
1598 | |||||||
1599 | /// Perform a cast towards the class of the Decl (either up or down the | ||||||
1600 | /// hierarchy). | ||||||
1601 | bool castBack(const CXXRecordDecl *Class) { | ||||||
1602 | assert(!Path.empty())((!Path.empty()) ? static_cast<void> (0) : __assert_fail ("!Path.empty()", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1602, __PRETTY_FUNCTION__)); | ||||||
1603 | const CXXRecordDecl *Expected; | ||||||
1604 | if (Path.size() >= 2) | ||||||
1605 | Expected = Path[Path.size() - 2]; | ||||||
1606 | else | ||||||
1607 | Expected = getContainingRecord(); | ||||||
1608 | if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { | ||||||
1609 | // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), | ||||||
1610 | // if B does not contain the original member and is not a base or | ||||||
1611 | // derived class of the class containing the original member, the result | ||||||
1612 | // of the cast is undefined. | ||||||
1613 | // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to | ||||||
1614 | // (D::*). We consider that to be a language defect. | ||||||
1615 | return false; | ||||||
1616 | } | ||||||
1617 | Path.pop_back(); | ||||||
1618 | return true; | ||||||
1619 | } | ||||||
1620 | /// Perform a base-to-derived member pointer cast. | ||||||
1621 | bool castToDerived(const CXXRecordDecl *Derived) { | ||||||
1622 | if (!getDecl()) | ||||||
1623 | return true; | ||||||
1624 | if (!isDerivedMember()) { | ||||||
1625 | Path.push_back(Derived); | ||||||
1626 | return true; | ||||||
1627 | } | ||||||
1628 | if (!castBack(Derived)) | ||||||
1629 | return false; | ||||||
1630 | if (Path.empty()) | ||||||
1631 | DeclAndIsDerivedMember.setInt(false); | ||||||
1632 | return true; | ||||||
1633 | } | ||||||
1634 | /// Perform a derived-to-base member pointer cast. | ||||||
1635 | bool castToBase(const CXXRecordDecl *Base) { | ||||||
1636 | if (!getDecl()) | ||||||
1637 | return true; | ||||||
1638 | if (Path.empty()) | ||||||
1639 | DeclAndIsDerivedMember.setInt(true); | ||||||
1640 | if (isDerivedMember()) { | ||||||
1641 | Path.push_back(Base); | ||||||
1642 | return true; | ||||||
1643 | } | ||||||
1644 | return castBack(Base); | ||||||
1645 | } | ||||||
1646 | }; | ||||||
1647 | |||||||
1648 | /// Compare two member pointers, which are assumed to be of the same type. | ||||||
1649 | static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { | ||||||
1650 | if (!LHS.getDecl() || !RHS.getDecl()) | ||||||
1651 | return !LHS.getDecl() && !RHS.getDecl(); | ||||||
1652 | if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) | ||||||
1653 | return false; | ||||||
1654 | return LHS.Path == RHS.Path; | ||||||
1655 | } | ||||||
1656 | } | ||||||
1657 | |||||||
1658 | static bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E); | ||||||
1659 | static bool EvaluateInPlace(APValue &Result, EvalInfo &Info, | ||||||
1660 | const LValue &This, const Expr *E, | ||||||
1661 | bool AllowNonLiteralTypes = false); | ||||||
1662 | static bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info, | ||||||
1663 | bool InvalidBaseOK = false); | ||||||
1664 | static bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info, | ||||||
1665 | bool InvalidBaseOK = false); | ||||||
1666 | static bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, | ||||||
1667 | EvalInfo &Info); | ||||||
1668 | static bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); | ||||||
1669 | static bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); | ||||||
1670 | static bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, | ||||||
1671 | EvalInfo &Info); | ||||||
1672 | static bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); | ||||||
1673 | static bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); | ||||||
1674 | static bool EvaluateAtomic(const Expr *E, const LValue *This, APValue &Result, | ||||||
1675 | EvalInfo &Info); | ||||||
1676 | static bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result); | ||||||
1677 | |||||||
1678 | /// Evaluate an integer or fixed point expression into an APResult. | ||||||
1679 | static bool EvaluateFixedPointOrInteger(const Expr *E, APFixedPoint &Result, | ||||||
1680 | EvalInfo &Info); | ||||||
1681 | |||||||
1682 | /// Evaluate only a fixed point expression into an APResult. | ||||||
1683 | static bool EvaluateFixedPoint(const Expr *E, APFixedPoint &Result, | ||||||
1684 | EvalInfo &Info); | ||||||
1685 | |||||||
1686 | //===----------------------------------------------------------------------===// | ||||||
1687 | // Misc utilities | ||||||
1688 | //===----------------------------------------------------------------------===// | ||||||
1689 | |||||||
1690 | /// Negate an APSInt in place, converting it to a signed form if necessary, and | ||||||
1691 | /// preserving its value (by extending by up to one bit as needed). | ||||||
1692 | static void negateAsSigned(APSInt &Int) { | ||||||
1693 | if (Int.isUnsigned() || Int.isMinSignedValue()) { | ||||||
1694 | Int = Int.extend(Int.getBitWidth() + 1); | ||||||
1695 | Int.setIsSigned(true); | ||||||
1696 | } | ||||||
1697 | Int = -Int; | ||||||
1698 | } | ||||||
1699 | |||||||
1700 | template<typename KeyT> | ||||||
1701 | APValue &CallStackFrame::createTemporary(const KeyT *Key, QualType T, | ||||||
1702 | bool IsLifetimeExtended, LValue &LV) { | ||||||
1703 | unsigned Version = getTempVersion(); | ||||||
1704 | APValue::LValueBase Base(Key, Index, Version); | ||||||
1705 | LV.set(Base); | ||||||
1706 | APValue &Result = Temporaries[MapKeyTy(Key, Version)]; | ||||||
1707 | assert(Result.isAbsent() && "temporary created multiple times")((Result.isAbsent() && "temporary created multiple times" ) ? static_cast<void> (0) : __assert_fail ("Result.isAbsent() && \"temporary created multiple times\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1707, __PRETTY_FUNCTION__)); | ||||||
1708 | |||||||
1709 | // If we're creating a temporary immediately in the operand of a speculative | ||||||
1710 | // evaluation, don't register a cleanup to be run outside the speculative | ||||||
1711 | // evaluation context, since we won't actually be able to initialize this | ||||||
1712 | // object. | ||||||
1713 | if (Index <= Info.SpeculativeEvaluationDepth) { | ||||||
1714 | if (T.isDestructedType()) | ||||||
1715 | Info.noteSideEffect(); | ||||||
1716 | } else { | ||||||
1717 | Info.CleanupStack.push_back(Cleanup(&Result, Base, T, IsLifetimeExtended)); | ||||||
1718 | } | ||||||
1719 | return Result; | ||||||
1720 | } | ||||||
1721 | |||||||
1722 | APValue *EvalInfo::createHeapAlloc(const Expr *E, QualType T, LValue &LV) { | ||||||
1723 | if (NumHeapAllocs > DynamicAllocLValue::getMaxIndex()) { | ||||||
1724 | FFDiag(E, diag::note_constexpr_heap_alloc_limit_exceeded); | ||||||
1725 | return nullptr; | ||||||
1726 | } | ||||||
1727 | |||||||
1728 | DynamicAllocLValue DA(NumHeapAllocs++); | ||||||
1729 | LV.set(APValue::LValueBase::getDynamicAlloc(DA, T)); | ||||||
1730 | auto Result = HeapAllocs.emplace(std::piecewise_construct, | ||||||
1731 | std::forward_as_tuple(DA), std::tuple<>()); | ||||||
1732 | assert(Result.second && "reused a heap alloc index?")((Result.second && "reused a heap alloc index?") ? static_cast <void> (0) : __assert_fail ("Result.second && \"reused a heap alloc index?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1732, __PRETTY_FUNCTION__)); | ||||||
1733 | Result.first->second.AllocExpr = E; | ||||||
1734 | return &Result.first->second.Value; | ||||||
1735 | } | ||||||
1736 | |||||||
1737 | /// Produce a string describing the given constexpr call. | ||||||
1738 | void CallStackFrame::describe(raw_ostream &Out) { | ||||||
1739 | unsigned ArgIndex = 0; | ||||||
1740 | bool IsMemberCall = isa<CXXMethodDecl>(Callee) && | ||||||
1741 | !isa<CXXConstructorDecl>(Callee) && | ||||||
1742 | cast<CXXMethodDecl>(Callee)->isInstance(); | ||||||
1743 | |||||||
1744 | if (!IsMemberCall) | ||||||
1745 | Out << *Callee << '('; | ||||||
1746 | |||||||
1747 | if (This && IsMemberCall) { | ||||||
1748 | APValue Val; | ||||||
1749 | This->moveInto(Val); | ||||||
1750 | Val.printPretty(Out, Info.Ctx, | ||||||
1751 | This->Designator.MostDerivedType); | ||||||
1752 | // FIXME: Add parens around Val if needed. | ||||||
1753 | Out << "->" << *Callee << '('; | ||||||
1754 | IsMemberCall = false; | ||||||
1755 | } | ||||||
1756 | |||||||
1757 | for (FunctionDecl::param_const_iterator I = Callee->param_begin(), | ||||||
1758 | E = Callee->param_end(); I != E; ++I, ++ArgIndex) { | ||||||
1759 | if (ArgIndex > (unsigned)IsMemberCall) | ||||||
1760 | Out << ", "; | ||||||
1761 | |||||||
1762 | const ParmVarDecl *Param = *I; | ||||||
1763 | const APValue &Arg = Arguments[ArgIndex]; | ||||||
1764 | Arg.printPretty(Out, Info.Ctx, Param->getType()); | ||||||
1765 | |||||||
1766 | if (ArgIndex == 0 && IsMemberCall) | ||||||
1767 | Out << "->" << *Callee << '('; | ||||||
1768 | } | ||||||
1769 | |||||||
1770 | Out << ')'; | ||||||
1771 | } | ||||||
1772 | |||||||
1773 | /// Evaluate an expression to see if it had side-effects, and discard its | ||||||
1774 | /// result. | ||||||
1775 | /// \return \c true if the caller should keep evaluating. | ||||||
1776 | static bool EvaluateIgnoredValue(EvalInfo &Info, const Expr *E) { | ||||||
1777 | APValue Scratch; | ||||||
1778 | if (!Evaluate(Scratch, Info, E)) | ||||||
1779 | // We don't need the value, but we might have skipped a side effect here. | ||||||
1780 | return Info.noteSideEffect(); | ||||||
1781 | return true; | ||||||
1782 | } | ||||||
1783 | |||||||
1784 | /// Should this call expression be treated as a string literal? | ||||||
1785 | static bool IsStringLiteralCall(const CallExpr *E) { | ||||||
1786 | unsigned Builtin = E->getBuiltinCallee(); | ||||||
1787 | return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || | ||||||
1788 | Builtin == Builtin::BI__builtin___NSStringMakeConstantString); | ||||||
1789 | } | ||||||
1790 | |||||||
1791 | static bool IsGlobalLValue(APValue::LValueBase B) { | ||||||
1792 | // C++11 [expr.const]p3 An address constant expression is a prvalue core | ||||||
1793 | // constant expression of pointer type that evaluates to... | ||||||
1794 | |||||||
1795 | // ... a null pointer value, or a prvalue core constant expression of type | ||||||
1796 | // std::nullptr_t. | ||||||
1797 | if (!B) return true; | ||||||
1798 | |||||||
1799 | if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { | ||||||
1800 | // ... the address of an object with static storage duration, | ||||||
1801 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) | ||||||
1802 | return VD->hasGlobalStorage(); | ||||||
1803 | // ... the address of a function, | ||||||
1804 | return isa<FunctionDecl>(D); | ||||||
1805 | } | ||||||
1806 | |||||||
1807 | if (B.is<TypeInfoLValue>() || B.is<DynamicAllocLValue>()) | ||||||
1808 | return true; | ||||||
1809 | |||||||
1810 | const Expr *E = B.get<const Expr*>(); | ||||||
1811 | switch (E->getStmtClass()) { | ||||||
1812 | default: | ||||||
1813 | return false; | ||||||
1814 | case Expr::CompoundLiteralExprClass: { | ||||||
1815 | const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); | ||||||
1816 | return CLE->isFileScope() && CLE->isLValue(); | ||||||
1817 | } | ||||||
1818 | case Expr::MaterializeTemporaryExprClass: | ||||||
1819 | // A materialized temporary might have been lifetime-extended to static | ||||||
1820 | // storage duration. | ||||||
1821 | return cast<MaterializeTemporaryExpr>(E)->getStorageDuration() == SD_Static; | ||||||
1822 | // A string literal has static storage duration. | ||||||
1823 | case Expr::StringLiteralClass: | ||||||
1824 | case Expr::PredefinedExprClass: | ||||||
1825 | case Expr::ObjCStringLiteralClass: | ||||||
1826 | case Expr::ObjCEncodeExprClass: | ||||||
1827 | case Expr::CXXUuidofExprClass: | ||||||
1828 | return true; | ||||||
1829 | case Expr::ObjCBoxedExprClass: | ||||||
1830 | return cast<ObjCBoxedExpr>(E)->isExpressibleAsConstantInitializer(); | ||||||
1831 | case Expr::CallExprClass: | ||||||
1832 | return IsStringLiteralCall(cast<CallExpr>(E)); | ||||||
1833 | // For GCC compatibility, &&label has static storage duration. | ||||||
1834 | case Expr::AddrLabelExprClass: | ||||||
1835 | return true; | ||||||
1836 | // A Block literal expression may be used as the initialization value for | ||||||
1837 | // Block variables at global or local static scope. | ||||||
1838 | case Expr::BlockExprClass: | ||||||
1839 | return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); | ||||||
1840 | case Expr::ImplicitValueInitExprClass: | ||||||
1841 | // FIXME: | ||||||
1842 | // We can never form an lvalue with an implicit value initialization as its | ||||||
1843 | // base through expression evaluation, so these only appear in one case: the | ||||||
1844 | // implicit variable declaration we invent when checking whether a constexpr | ||||||
1845 | // constructor can produce a constant expression. We must assume that such | ||||||
1846 | // an expression might be a global lvalue. | ||||||
1847 | return true; | ||||||
1848 | } | ||||||
1849 | } | ||||||
1850 | |||||||
1851 | static const ValueDecl *GetLValueBaseDecl(const LValue &LVal) { | ||||||
1852 | return LVal.Base.dyn_cast<const ValueDecl*>(); | ||||||
1853 | } | ||||||
1854 | |||||||
1855 | static bool IsLiteralLValue(const LValue &Value) { | ||||||
1856 | if (Value.getLValueCallIndex()) | ||||||
1857 | return false; | ||||||
1858 | const Expr *E = Value.Base.dyn_cast<const Expr*>(); | ||||||
1859 | return E && !isa<MaterializeTemporaryExpr>(E); | ||||||
1860 | } | ||||||
1861 | |||||||
1862 | static bool IsWeakLValue(const LValue &Value) { | ||||||
1863 | const ValueDecl *Decl = GetLValueBaseDecl(Value); | ||||||
1864 | return Decl && Decl->isWeak(); | ||||||
1865 | } | ||||||
1866 | |||||||
1867 | static bool isZeroSized(const LValue &Value) { | ||||||
1868 | const ValueDecl *Decl = GetLValueBaseDecl(Value); | ||||||
1869 | if (Decl && isa<VarDecl>(Decl)) { | ||||||
1870 | QualType Ty = Decl->getType(); | ||||||
1871 | if (Ty->isArrayType()) | ||||||
1872 | return Ty->isIncompleteType() || | ||||||
1873 | Decl->getASTContext().getTypeSize(Ty) == 0; | ||||||
1874 | } | ||||||
1875 | return false; | ||||||
1876 | } | ||||||
1877 | |||||||
1878 | static bool HasSameBase(const LValue &A, const LValue &B) { | ||||||
1879 | if (!A.getLValueBase()) | ||||||
1880 | return !B.getLValueBase(); | ||||||
1881 | if (!B.getLValueBase()) | ||||||
1882 | return false; | ||||||
1883 | |||||||
1884 | if (A.getLValueBase().getOpaqueValue() != | ||||||
1885 | B.getLValueBase().getOpaqueValue()) { | ||||||
1886 | const Decl *ADecl = GetLValueBaseDecl(A); | ||||||
1887 | if (!ADecl) | ||||||
1888 | return false; | ||||||
1889 | const Decl *BDecl = GetLValueBaseDecl(B); | ||||||
1890 | if (!BDecl || ADecl->getCanonicalDecl() != BDecl->getCanonicalDecl()) | ||||||
1891 | return false; | ||||||
1892 | } | ||||||
1893 | |||||||
1894 | return IsGlobalLValue(A.getLValueBase()) || | ||||||
1895 | (A.getLValueCallIndex() == B.getLValueCallIndex() && | ||||||
1896 | A.getLValueVersion() == B.getLValueVersion()); | ||||||
1897 | } | ||||||
1898 | |||||||
1899 | static void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { | ||||||
1900 | assert(Base && "no location for a null lvalue")((Base && "no location for a null lvalue") ? static_cast <void> (0) : __assert_fail ("Base && \"no location for a null lvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1900, __PRETTY_FUNCTION__)); | ||||||
1901 | const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); | ||||||
1902 | if (VD) | ||||||
1903 | Info.Note(VD->getLocation(), diag::note_declared_at); | ||||||
1904 | else if (const Expr *E = Base.dyn_cast<const Expr*>()) | ||||||
1905 | Info.Note(E->getExprLoc(), diag::note_constexpr_temporary_here); | ||||||
1906 | else if (DynamicAllocLValue DA = Base.dyn_cast<DynamicAllocLValue>()) { | ||||||
1907 | // FIXME: Produce a note for dangling pointers too. | ||||||
1908 | if (Optional<EvalInfo::DynAlloc*> Alloc = Info.lookupDynamicAlloc(DA)) | ||||||
1909 | Info.Note((*Alloc)->AllocExpr->getExprLoc(), | ||||||
1910 | diag::note_constexpr_dynamic_alloc_here); | ||||||
1911 | } | ||||||
1912 | // We have no information to show for a typeid(T) object. | ||||||
1913 | } | ||||||
1914 | |||||||
1915 | enum class CheckEvaluationResultKind { | ||||||
1916 | ConstantExpression, | ||||||
1917 | FullyInitialized, | ||||||
1918 | }; | ||||||
1919 | |||||||
1920 | /// Materialized temporaries that we've already checked to determine if they're | ||||||
1921 | /// initializsed by a constant expression. | ||||||
1922 | using CheckedTemporaries = | ||||||
1923 | llvm::SmallPtrSet<const MaterializeTemporaryExpr *, 8>; | ||||||
1924 | |||||||
1925 | static bool CheckEvaluationResult(CheckEvaluationResultKind CERK, | ||||||
1926 | EvalInfo &Info, SourceLocation DiagLoc, | ||||||
1927 | QualType Type, const APValue &Value, | ||||||
1928 | Expr::ConstExprUsage Usage, | ||||||
1929 | SourceLocation SubobjectLoc, | ||||||
1930 | CheckedTemporaries &CheckedTemps); | ||||||
1931 | |||||||
1932 | /// Check that this reference or pointer core constant expression is a valid | ||||||
1933 | /// value for an address or reference constant expression. Return true if we | ||||||
1934 | /// can fold this expression, whether or not it's a constant expression. | ||||||
1935 | static bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, | ||||||
1936 | QualType Type, const LValue &LVal, | ||||||
1937 | Expr::ConstExprUsage Usage, | ||||||
1938 | CheckedTemporaries &CheckedTemps) { | ||||||
1939 | bool IsReferenceType = Type->isReferenceType(); | ||||||
1940 | |||||||
1941 | APValue::LValueBase Base = LVal.getLValueBase(); | ||||||
1942 | const SubobjectDesignator &Designator = LVal.getLValueDesignator(); | ||||||
1943 | |||||||
1944 | // Check that the object is a global. Note that the fake 'this' object we | ||||||
1945 | // manufacture when checking potential constant expressions is conservatively | ||||||
1946 | // assumed to be global here. | ||||||
1947 | if (!IsGlobalLValue(Base)) { | ||||||
1948 | if (Info.getLangOpts().CPlusPlus11) { | ||||||
1949 | const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); | ||||||
1950 | Info.FFDiag(Loc, diag::note_constexpr_non_global, 1) | ||||||
1951 | << IsReferenceType << !Designator.Entries.empty() | ||||||
1952 | << !!VD << VD; | ||||||
1953 | NoteLValueLocation(Info, Base); | ||||||
1954 | } else { | ||||||
1955 | Info.FFDiag(Loc); | ||||||
1956 | } | ||||||
1957 | // Don't allow references to temporaries to escape. | ||||||
1958 | return false; | ||||||
1959 | } | ||||||
1960 | assert((Info.checkingPotentialConstantExpression() ||(((Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex () == 0) && "have call index for global lvalue") ? static_cast <void> (0) : __assert_fail ("(Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex() == 0) && \"have call index for global lvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1962, __PRETTY_FUNCTION__)) | ||||||
1961 | LVal.getLValueCallIndex() == 0) &&(((Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex () == 0) && "have call index for global lvalue") ? static_cast <void> (0) : __assert_fail ("(Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex() == 0) && \"have call index for global lvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1962, __PRETTY_FUNCTION__)) | ||||||
1962 | "have call index for global lvalue")(((Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex () == 0) && "have call index for global lvalue") ? static_cast <void> (0) : __assert_fail ("(Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex() == 0) && \"have call index for global lvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 1962, __PRETTY_FUNCTION__)); | ||||||
1963 | |||||||
1964 | if (Base.is<DynamicAllocLValue>()) { | ||||||
1965 | Info.FFDiag(Loc, diag::note_constexpr_dynamic_alloc) | ||||||
1966 | << IsReferenceType << !Designator.Entries.empty(); | ||||||
1967 | NoteLValueLocation(Info, Base); | ||||||
1968 | return false; | ||||||
1969 | } | ||||||
1970 | |||||||
1971 | if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) { | ||||||
1972 | if (const VarDecl *Var = dyn_cast<const VarDecl>(VD)) { | ||||||
1973 | // Check if this is a thread-local variable. | ||||||
1974 | if (Var->getTLSKind()) | ||||||
1975 | // FIXME: Diagnostic! | ||||||
1976 | return false; | ||||||
1977 | |||||||
1978 | // A dllimport variable never acts like a constant. | ||||||
1979 | if (Usage == Expr::EvaluateForCodeGen && Var->hasAttr<DLLImportAttr>()) | ||||||
1980 | // FIXME: Diagnostic! | ||||||
1981 | return false; | ||||||
1982 | } | ||||||
1983 | if (const auto *FD = dyn_cast<const FunctionDecl>(VD)) { | ||||||
1984 | // __declspec(dllimport) must be handled very carefully: | ||||||
1985 | // We must never initialize an expression with the thunk in C++. | ||||||
1986 | // Doing otherwise would allow the same id-expression to yield | ||||||
1987 | // different addresses for the same function in different translation | ||||||
1988 | // units. However, this means that we must dynamically initialize the | ||||||
1989 | // expression with the contents of the import address table at runtime. | ||||||
1990 | // | ||||||
1991 | // The C language has no notion of ODR; furthermore, it has no notion of | ||||||
1992 | // dynamic initialization. This means that we are permitted to | ||||||
1993 | // perform initialization with the address of the thunk. | ||||||
1994 | if (Info.getLangOpts().CPlusPlus && Usage == Expr::EvaluateForCodeGen && | ||||||
1995 | FD->hasAttr<DLLImportAttr>()) | ||||||
1996 | // FIXME: Diagnostic! | ||||||
1997 | return false; | ||||||
1998 | } | ||||||
1999 | } else if (const auto *MTE = dyn_cast_or_null<MaterializeTemporaryExpr>( | ||||||
2000 | Base.dyn_cast<const Expr *>())) { | ||||||
2001 | if (CheckedTemps.insert(MTE).second) { | ||||||
2002 | QualType TempType = getType(Base); | ||||||
2003 | if (TempType.isDestructedType()) { | ||||||
2004 | Info.FFDiag(MTE->getExprLoc(), | ||||||
2005 | diag::note_constexpr_unsupported_tempoarary_nontrivial_dtor) | ||||||
2006 | << TempType; | ||||||
2007 | return false; | ||||||
2008 | } | ||||||
2009 | |||||||
2010 | APValue *V = Info.Ctx.getMaterializedTemporaryValue(MTE, false); | ||||||
2011 | assert(V && "evasluation result refers to uninitialised temporary")((V && "evasluation result refers to uninitialised temporary" ) ? static_cast<void> (0) : __assert_fail ("V && \"evasluation result refers to uninitialised temporary\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2011, __PRETTY_FUNCTION__)); | ||||||
2012 | if (!CheckEvaluationResult(CheckEvaluationResultKind::ConstantExpression, | ||||||
2013 | Info, MTE->getExprLoc(), TempType, *V, | ||||||
2014 | Usage, SourceLocation(), CheckedTemps)) | ||||||
2015 | return false; | ||||||
2016 | } | ||||||
2017 | } | ||||||
2018 | |||||||
2019 | // Allow address constant expressions to be past-the-end pointers. This is | ||||||
2020 | // an extension: the standard requires them to point to an object. | ||||||
2021 | if (!IsReferenceType) | ||||||
2022 | return true; | ||||||
2023 | |||||||
2024 | // A reference constant expression must refer to an object. | ||||||
2025 | if (!Base) { | ||||||
2026 | // FIXME: diagnostic | ||||||
2027 | Info.CCEDiag(Loc); | ||||||
2028 | return true; | ||||||
2029 | } | ||||||
2030 | |||||||
2031 | // Does this refer one past the end of some object? | ||||||
2032 | if (!Designator.Invalid && Designator.isOnePastTheEnd()) { | ||||||
2033 | const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); | ||||||
2034 | Info.FFDiag(Loc, diag::note_constexpr_past_end, 1) | ||||||
2035 | << !Designator.Entries.empty() << !!VD << VD; | ||||||
2036 | NoteLValueLocation(Info, Base); | ||||||
2037 | } | ||||||
2038 | |||||||
2039 | return true; | ||||||
2040 | } | ||||||
2041 | |||||||
2042 | /// Member pointers are constant expressions unless they point to a | ||||||
2043 | /// non-virtual dllimport member function. | ||||||
2044 | static bool CheckMemberPointerConstantExpression(EvalInfo &Info, | ||||||
2045 | SourceLocation Loc, | ||||||
2046 | QualType Type, | ||||||
2047 | const APValue &Value, | ||||||
2048 | Expr::ConstExprUsage Usage) { | ||||||
2049 | const ValueDecl *Member = Value.getMemberPointerDecl(); | ||||||
2050 | const auto *FD = dyn_cast_or_null<CXXMethodDecl>(Member); | ||||||
2051 | if (!FD) | ||||||
2052 | return true; | ||||||
2053 | return Usage == Expr::EvaluateForMangling || FD->isVirtual() || | ||||||
2054 | !FD->hasAttr<DLLImportAttr>(); | ||||||
2055 | } | ||||||
2056 | |||||||
2057 | /// Check that this core constant expression is of literal type, and if not, | ||||||
2058 | /// produce an appropriate diagnostic. | ||||||
2059 | static bool CheckLiteralType(EvalInfo &Info, const Expr *E, | ||||||
2060 | const LValue *This = nullptr) { | ||||||
2061 | if (!E->isRValue() || E->getType()->isLiteralType(Info.Ctx)) | ||||||
2062 | return true; | ||||||
2063 | |||||||
2064 | // C++1y: A constant initializer for an object o [...] may also invoke | ||||||
2065 | // constexpr constructors for o and its subobjects even if those objects | ||||||
2066 | // are of non-literal class types. | ||||||
2067 | // | ||||||
2068 | // C++11 missed this detail for aggregates, so classes like this: | ||||||
2069 | // struct foo_t { union { int i; volatile int j; } u; }; | ||||||
2070 | // are not (obviously) initializable like so: | ||||||
2071 | // __attribute__((__require_constant_initialization__)) | ||||||
2072 | // static const foo_t x = {{0}}; | ||||||
2073 | // because "i" is a subobject with non-literal initialization (due to the | ||||||
2074 | // volatile member of the union). See: | ||||||
2075 | // http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1677 | ||||||
2076 | // Therefore, we use the C++1y behavior. | ||||||
2077 | if (This && Info.EvaluatingDecl == This->getLValueBase()) | ||||||
2078 | return true; | ||||||
2079 | |||||||
2080 | // Prvalue constant expressions must be of literal types. | ||||||
2081 | if (Info.getLangOpts().CPlusPlus11) | ||||||
2082 | Info.FFDiag(E, diag::note_constexpr_nonliteral) | ||||||
2083 | << E->getType(); | ||||||
2084 | else | ||||||
2085 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
2086 | return false; | ||||||
2087 | } | ||||||
2088 | |||||||
2089 | static bool CheckEvaluationResult(CheckEvaluationResultKind CERK, | ||||||
2090 | EvalInfo &Info, SourceLocation DiagLoc, | ||||||
2091 | QualType Type, const APValue &Value, | ||||||
2092 | Expr::ConstExprUsage Usage, | ||||||
2093 | SourceLocation SubobjectLoc, | ||||||
2094 | CheckedTemporaries &CheckedTemps) { | ||||||
2095 | if (!Value.hasValue()) { | ||||||
2096 | Info.FFDiag(DiagLoc, diag::note_constexpr_uninitialized) | ||||||
2097 | << true << Type; | ||||||
2098 | if (SubobjectLoc.isValid()) | ||||||
2099 | Info.Note(SubobjectLoc, diag::note_constexpr_subobject_declared_here); | ||||||
2100 | return false; | ||||||
2101 | } | ||||||
2102 | |||||||
2103 | // We allow _Atomic(T) to be initialized from anything that T can be | ||||||
2104 | // initialized from. | ||||||
2105 | if (const AtomicType *AT = Type->getAs<AtomicType>()) | ||||||
2106 | Type = AT->getValueType(); | ||||||
2107 | |||||||
2108 | // Core issue 1454: For a literal constant expression of array or class type, | ||||||
2109 | // each subobject of its value shall have been initialized by a constant | ||||||
2110 | // expression. | ||||||
2111 | if (Value.isArray()) { | ||||||
2112 | QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); | ||||||
2113 | for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { | ||||||
2114 | if (!CheckEvaluationResult(CERK, Info, DiagLoc, EltTy, | ||||||
2115 | Value.getArrayInitializedElt(I), Usage, | ||||||
2116 | SubobjectLoc, CheckedTemps)) | ||||||
2117 | return false; | ||||||
2118 | } | ||||||
2119 | if (!Value.hasArrayFiller()) | ||||||
2120 | return true; | ||||||
2121 | return CheckEvaluationResult(CERK, Info, DiagLoc, EltTy, | ||||||
2122 | Value.getArrayFiller(), Usage, SubobjectLoc, | ||||||
2123 | CheckedTemps); | ||||||
2124 | } | ||||||
2125 | if (Value.isUnion() && Value.getUnionField()) { | ||||||
2126 | return CheckEvaluationResult( | ||||||
2127 | CERK, Info, DiagLoc, Value.getUnionField()->getType(), | ||||||
2128 | Value.getUnionValue(), Usage, Value.getUnionField()->getLocation(), | ||||||
2129 | CheckedTemps); | ||||||
2130 | } | ||||||
2131 | if (Value.isStruct()) { | ||||||
2132 | RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); | ||||||
2133 | if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { | ||||||
2134 | unsigned BaseIndex = 0; | ||||||
2135 | for (const CXXBaseSpecifier &BS : CD->bases()) { | ||||||
2136 | if (!CheckEvaluationResult(CERK, Info, DiagLoc, BS.getType(), | ||||||
2137 | Value.getStructBase(BaseIndex), Usage, | ||||||
2138 | BS.getBeginLoc(), CheckedTemps)) | ||||||
2139 | return false; | ||||||
2140 | ++BaseIndex; | ||||||
2141 | } | ||||||
2142 | } | ||||||
2143 | for (const auto *I : RD->fields()) { | ||||||
2144 | if (I->isUnnamedBitfield()) | ||||||
2145 | continue; | ||||||
2146 | |||||||
2147 | if (!CheckEvaluationResult(CERK, Info, DiagLoc, I->getType(), | ||||||
2148 | Value.getStructField(I->getFieldIndex()), | ||||||
2149 | Usage, I->getLocation(), CheckedTemps)) | ||||||
2150 | return false; | ||||||
2151 | } | ||||||
2152 | } | ||||||
2153 | |||||||
2154 | if (Value.isLValue() && | ||||||
2155 | CERK == CheckEvaluationResultKind::ConstantExpression) { | ||||||
2156 | LValue LVal; | ||||||
2157 | LVal.setFrom(Info.Ctx, Value); | ||||||
2158 | return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal, Usage, | ||||||
2159 | CheckedTemps); | ||||||
2160 | } | ||||||
2161 | |||||||
2162 | if (Value.isMemberPointer() && | ||||||
2163 | CERK == CheckEvaluationResultKind::ConstantExpression) | ||||||
2164 | return CheckMemberPointerConstantExpression(Info, DiagLoc, Type, Value, Usage); | ||||||
2165 | |||||||
2166 | // Everything else is fine. | ||||||
2167 | return true; | ||||||
2168 | } | ||||||
2169 | |||||||
2170 | /// Check that this core constant expression value is a valid value for a | ||||||
2171 | /// constant expression. If not, report an appropriate diagnostic. Does not | ||||||
2172 | /// check that the expression is of literal type. | ||||||
2173 | static bool | ||||||
2174 | CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, QualType Type, | ||||||
2175 | const APValue &Value, | ||||||
2176 | Expr::ConstExprUsage Usage = Expr::EvaluateForCodeGen) { | ||||||
2177 | CheckedTemporaries CheckedTemps; | ||||||
2178 | return CheckEvaluationResult(CheckEvaluationResultKind::ConstantExpression, | ||||||
2179 | Info, DiagLoc, Type, Value, Usage, | ||||||
2180 | SourceLocation(), CheckedTemps); | ||||||
2181 | } | ||||||
2182 | |||||||
2183 | /// Check that this evaluated value is fully-initialized and can be loaded by | ||||||
2184 | /// an lvalue-to-rvalue conversion. | ||||||
2185 | static bool CheckFullyInitialized(EvalInfo &Info, SourceLocation DiagLoc, | ||||||
2186 | QualType Type, const APValue &Value) { | ||||||
2187 | CheckedTemporaries CheckedTemps; | ||||||
2188 | return CheckEvaluationResult( | ||||||
2189 | CheckEvaluationResultKind::FullyInitialized, Info, DiagLoc, Type, Value, | ||||||
2190 | Expr::EvaluateForCodeGen, SourceLocation(), CheckedTemps); | ||||||
2191 | } | ||||||
2192 | |||||||
2193 | /// Enforce C++2a [expr.const]/4.17, which disallows new-expressions unless | ||||||
2194 | /// "the allocated storage is deallocated within the evaluation". | ||||||
2195 | static bool CheckMemoryLeaks(EvalInfo &Info) { | ||||||
2196 | if (!Info.HeapAllocs.empty()) { | ||||||
2197 | // We can still fold to a constant despite a compile-time memory leak, | ||||||
2198 | // so long as the heap allocation isn't referenced in the result (we check | ||||||
2199 | // that in CheckConstantExpression). | ||||||
2200 | Info.CCEDiag(Info.HeapAllocs.begin()->second.AllocExpr, | ||||||
2201 | diag::note_constexpr_memory_leak) | ||||||
2202 | << unsigned(Info.HeapAllocs.size() - 1); | ||||||
2203 | } | ||||||
2204 | return true; | ||||||
2205 | } | ||||||
2206 | |||||||
2207 | static bool EvalPointerValueAsBool(const APValue &Value, bool &Result) { | ||||||
2208 | // A null base expression indicates a null pointer. These are always | ||||||
2209 | // evaluatable, and they are false unless the offset is zero. | ||||||
2210 | if (!Value.getLValueBase()) { | ||||||
2211 | Result = !Value.getLValueOffset().isZero(); | ||||||
2212 | return true; | ||||||
2213 | } | ||||||
2214 | |||||||
2215 | // We have a non-null base. These are generally known to be true, but if it's | ||||||
2216 | // a weak declaration it can be null at runtime. | ||||||
2217 | Result = true; | ||||||
2218 | const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); | ||||||
2219 | return !Decl || !Decl->isWeak(); | ||||||
2220 | } | ||||||
2221 | |||||||
2222 | static bool HandleConversionToBool(const APValue &Val, bool &Result) { | ||||||
2223 | switch (Val.getKind()) { | ||||||
2224 | case APValue::None: | ||||||
2225 | case APValue::Indeterminate: | ||||||
2226 | return false; | ||||||
2227 | case APValue::Int: | ||||||
2228 | Result = Val.getInt().getBoolValue(); | ||||||
2229 | return true; | ||||||
2230 | case APValue::FixedPoint: | ||||||
2231 | Result = Val.getFixedPoint().getBoolValue(); | ||||||
2232 | return true; | ||||||
2233 | case APValue::Float: | ||||||
2234 | Result = !Val.getFloat().isZero(); | ||||||
2235 | return true; | ||||||
2236 | case APValue::ComplexInt: | ||||||
2237 | Result = Val.getComplexIntReal().getBoolValue() || | ||||||
2238 | Val.getComplexIntImag().getBoolValue(); | ||||||
2239 | return true; | ||||||
2240 | case APValue::ComplexFloat: | ||||||
2241 | Result = !Val.getComplexFloatReal().isZero() || | ||||||
2242 | !Val.getComplexFloatImag().isZero(); | ||||||
2243 | return true; | ||||||
2244 | case APValue::LValue: | ||||||
2245 | return EvalPointerValueAsBool(Val, Result); | ||||||
2246 | case APValue::MemberPointer: | ||||||
2247 | Result = Val.getMemberPointerDecl(); | ||||||
2248 | return true; | ||||||
2249 | case APValue::Vector: | ||||||
2250 | case APValue::Array: | ||||||
2251 | case APValue::Struct: | ||||||
2252 | case APValue::Union: | ||||||
2253 | case APValue::AddrLabelDiff: | ||||||
2254 | return false; | ||||||
2255 | } | ||||||
2256 | |||||||
2257 | llvm_unreachable("unknown APValue kind")::llvm::llvm_unreachable_internal("unknown APValue kind", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2257); | ||||||
2258 | } | ||||||
2259 | |||||||
2260 | static bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, | ||||||
2261 | EvalInfo &Info) { | ||||||
2262 | assert(E->isRValue() && "missing lvalue-to-rvalue conv in bool condition")((E->isRValue() && "missing lvalue-to-rvalue conv in bool condition" ) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && \"missing lvalue-to-rvalue conv in bool condition\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2262, __PRETTY_FUNCTION__)); | ||||||
2263 | APValue Val; | ||||||
2264 | if (!Evaluate(Val, Info, E)) | ||||||
2265 | return false; | ||||||
2266 | return HandleConversionToBool(Val, Result); | ||||||
2267 | } | ||||||
2268 | |||||||
2269 | template<typename T> | ||||||
2270 | static bool HandleOverflow(EvalInfo &Info, const Expr *E, | ||||||
2271 | const T &SrcValue, QualType DestType) { | ||||||
2272 | Info.CCEDiag(E, diag::note_constexpr_overflow) | ||||||
2273 | << SrcValue << DestType; | ||||||
2274 | return Info.noteUndefinedBehavior(); | ||||||
2275 | } | ||||||
2276 | |||||||
2277 | static bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, | ||||||
2278 | QualType SrcType, const APFloat &Value, | ||||||
2279 | QualType DestType, APSInt &Result) { | ||||||
2280 | unsigned DestWidth = Info.Ctx.getIntWidth(DestType); | ||||||
2281 | // Determine whether we are converting to unsigned or signed. | ||||||
2282 | bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); | ||||||
2283 | |||||||
2284 | Result = APSInt(DestWidth, !DestSigned); | ||||||
2285 | bool ignored; | ||||||
2286 | if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) | ||||||
2287 | & APFloat::opInvalidOp) | ||||||
2288 | return HandleOverflow(Info, E, Value, DestType); | ||||||
2289 | return true; | ||||||
2290 | } | ||||||
2291 | |||||||
2292 | static bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, | ||||||
2293 | QualType SrcType, QualType DestType, | ||||||
2294 | APFloat &Result) { | ||||||
2295 | APFloat Value = Result; | ||||||
2296 | bool ignored; | ||||||
2297 | Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), | ||||||
2298 | APFloat::rmNearestTiesToEven, &ignored); | ||||||
2299 | return true; | ||||||
2300 | } | ||||||
2301 | |||||||
2302 | static APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, | ||||||
2303 | QualType DestType, QualType SrcType, | ||||||
2304 | const APSInt &Value) { | ||||||
2305 | unsigned DestWidth = Info.Ctx.getIntWidth(DestType); | ||||||
2306 | // Figure out if this is a truncate, extend or noop cast. | ||||||
2307 | // If the input is signed, do a sign extend, noop, or truncate. | ||||||
2308 | APSInt Result = Value.extOrTrunc(DestWidth); | ||||||
2309 | Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); | ||||||
2310 | if (DestType->isBooleanType()) | ||||||
2311 | Result = Value.getBoolValue(); | ||||||
2312 | return Result; | ||||||
2313 | } | ||||||
2314 | |||||||
2315 | static bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, | ||||||
2316 | QualType SrcType, const APSInt &Value, | ||||||
2317 | QualType DestType, APFloat &Result) { | ||||||
2318 | Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); | ||||||
2319 | Result.convertFromAPInt(Value, Value.isSigned(), | ||||||
2320 | APFloat::rmNearestTiesToEven); | ||||||
2321 | return true; | ||||||
2322 | } | ||||||
2323 | |||||||
2324 | static bool truncateBitfieldValue(EvalInfo &Info, const Expr *E, | ||||||
2325 | APValue &Value, const FieldDecl *FD) { | ||||||
2326 | assert(FD->isBitField() && "truncateBitfieldValue on non-bitfield")((FD->isBitField() && "truncateBitfieldValue on non-bitfield" ) ? static_cast<void> (0) : __assert_fail ("FD->isBitField() && \"truncateBitfieldValue on non-bitfield\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2326, __PRETTY_FUNCTION__)); | ||||||
2327 | |||||||
2328 | if (!Value.isInt()) { | ||||||
2329 | // Trying to store a pointer-cast-to-integer into a bitfield. | ||||||
2330 | // FIXME: In this case, we should provide the diagnostic for casting | ||||||
2331 | // a pointer to an integer. | ||||||
2332 | assert(Value.isLValue() && "integral value neither int nor lvalue?")((Value.isLValue() && "integral value neither int nor lvalue?" ) ? static_cast<void> (0) : __assert_fail ("Value.isLValue() && \"integral value neither int nor lvalue?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2332, __PRETTY_FUNCTION__)); | ||||||
2333 | Info.FFDiag(E); | ||||||
2334 | return false; | ||||||
2335 | } | ||||||
2336 | |||||||
2337 | APSInt &Int = Value.getInt(); | ||||||
2338 | unsigned OldBitWidth = Int.getBitWidth(); | ||||||
2339 | unsigned NewBitWidth = FD->getBitWidthValue(Info.Ctx); | ||||||
2340 | if (NewBitWidth < OldBitWidth) | ||||||
2341 | Int = Int.trunc(NewBitWidth).extend(OldBitWidth); | ||||||
2342 | return true; | ||||||
2343 | } | ||||||
2344 | |||||||
2345 | static bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, | ||||||
2346 | llvm::APInt &Res) { | ||||||
2347 | APValue SVal; | ||||||
2348 | if (!Evaluate(SVal, Info, E)) | ||||||
2349 | return false; | ||||||
2350 | if (SVal.isInt()) { | ||||||
2351 | Res = SVal.getInt(); | ||||||
2352 | return true; | ||||||
2353 | } | ||||||
2354 | if (SVal.isFloat()) { | ||||||
2355 | Res = SVal.getFloat().bitcastToAPInt(); | ||||||
2356 | return true; | ||||||
2357 | } | ||||||
2358 | if (SVal.isVector()) { | ||||||
2359 | QualType VecTy = E->getType(); | ||||||
2360 | unsigned VecSize = Info.Ctx.getTypeSize(VecTy); | ||||||
2361 | QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); | ||||||
2362 | unsigned EltSize = Info.Ctx.getTypeSize(EltTy); | ||||||
2363 | bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); | ||||||
2364 | Res = llvm::APInt::getNullValue(VecSize); | ||||||
2365 | for (unsigned i = 0; i < SVal.getVectorLength(); i++) { | ||||||
2366 | APValue &Elt = SVal.getVectorElt(i); | ||||||
2367 | llvm::APInt EltAsInt; | ||||||
2368 | if (Elt.isInt()) { | ||||||
2369 | EltAsInt = Elt.getInt(); | ||||||
2370 | } else if (Elt.isFloat()) { | ||||||
2371 | EltAsInt = Elt.getFloat().bitcastToAPInt(); | ||||||
2372 | } else { | ||||||
2373 | // Don't try to handle vectors of anything other than int or float | ||||||
2374 | // (not sure if it's possible to hit this case). | ||||||
2375 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
2376 | return false; | ||||||
2377 | } | ||||||
2378 | unsigned BaseEltSize = EltAsInt.getBitWidth(); | ||||||
2379 | if (BigEndian) | ||||||
2380 | Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); | ||||||
2381 | else | ||||||
2382 | Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); | ||||||
2383 | } | ||||||
2384 | return true; | ||||||
2385 | } | ||||||
2386 | // Give up if the input isn't an int, float, or vector. For example, we | ||||||
2387 | // reject "(v4i16)(intptr_t)&a". | ||||||
2388 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
2389 | return false; | ||||||
2390 | } | ||||||
2391 | |||||||
2392 | /// Perform the given integer operation, which is known to need at most BitWidth | ||||||
2393 | /// bits, and check for overflow in the original type (if that type was not an | ||||||
2394 | /// unsigned type). | ||||||
2395 | template<typename Operation> | ||||||
2396 | static bool CheckedIntArithmetic(EvalInfo &Info, const Expr *E, | ||||||
2397 | const APSInt &LHS, const APSInt &RHS, | ||||||
2398 | unsigned BitWidth, Operation Op, | ||||||
2399 | APSInt &Result) { | ||||||
2400 | if (LHS.isUnsigned()) { | ||||||
2401 | Result = Op(LHS, RHS); | ||||||
2402 | return true; | ||||||
2403 | } | ||||||
2404 | |||||||
2405 | APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); | ||||||
2406 | Result = Value.trunc(LHS.getBitWidth()); | ||||||
2407 | if (Result.extend(BitWidth) != Value) { | ||||||
2408 | if (Info.checkingForUndefinedBehavior()) | ||||||
2409 | Info.Ctx.getDiagnostics().Report(E->getExprLoc(), | ||||||
2410 | diag::warn_integer_constant_overflow) | ||||||
2411 | << Result.toString(10) << E->getType(); | ||||||
2412 | else | ||||||
2413 | return HandleOverflow(Info, E, Value, E->getType()); | ||||||
2414 | } | ||||||
2415 | return true; | ||||||
2416 | } | ||||||
2417 | |||||||
2418 | /// Perform the given binary integer operation. | ||||||
2419 | static bool handleIntIntBinOp(EvalInfo &Info, const Expr *E, const APSInt &LHS, | ||||||
2420 | BinaryOperatorKind Opcode, APSInt RHS, | ||||||
2421 | APSInt &Result) { | ||||||
2422 | switch (Opcode) { | ||||||
2423 | default: | ||||||
2424 | Info.FFDiag(E); | ||||||
2425 | return false; | ||||||
2426 | case BO_Mul: | ||||||
2427 | return CheckedIntArithmetic(Info, E, LHS, RHS, LHS.getBitWidth() * 2, | ||||||
2428 | std::multiplies<APSInt>(), Result); | ||||||
2429 | case BO_Add: | ||||||
2430 | return CheckedIntArithmetic(Info, E, LHS, RHS, LHS.getBitWidth() + 1, | ||||||
2431 | std::plus<APSInt>(), Result); | ||||||
2432 | case BO_Sub: | ||||||
2433 | return CheckedIntArithmetic(Info, E, LHS, RHS, LHS.getBitWidth() + 1, | ||||||
2434 | std::minus<APSInt>(), Result); | ||||||
2435 | case BO_And: Result = LHS & RHS; return true; | ||||||
2436 | case BO_Xor: Result = LHS ^ RHS; return true; | ||||||
2437 | case BO_Or: Result = LHS | RHS; return true; | ||||||
2438 | case BO_Div: | ||||||
2439 | case BO_Rem: | ||||||
2440 | if (RHS == 0) { | ||||||
2441 | Info.FFDiag(E, diag::note_expr_divide_by_zero); | ||||||
2442 | return false; | ||||||
2443 | } | ||||||
2444 | Result = (Opcode == BO_Rem ? LHS % RHS : LHS / RHS); | ||||||
2445 | // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. APSInt supports | ||||||
2446 | // this operation and gives the two's complement result. | ||||||
2447 | if (RHS.isNegative() && RHS.isAllOnesValue() && | ||||||
2448 | LHS.isSigned() && LHS.isMinSignedValue()) | ||||||
2449 | return HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), | ||||||
2450 | E->getType()); | ||||||
2451 | return true; | ||||||
2452 | case BO_Shl: { | ||||||
2453 | if (Info.getLangOpts().OpenCL) | ||||||
2454 | // OpenCL 6.3j: shift values are effectively % word size of LHS. | ||||||
2455 | RHS &= APSInt(llvm::APInt(RHS.getBitWidth(), | ||||||
2456 | static_cast<uint64_t>(LHS.getBitWidth() - 1)), | ||||||
2457 | RHS.isUnsigned()); | ||||||
2458 | else if (RHS.isSigned() && RHS.isNegative()) { | ||||||
2459 | // During constant-folding, a negative shift is an opposite shift. Such | ||||||
2460 | // a shift is not a constant expression. | ||||||
2461 | Info.CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; | ||||||
2462 | RHS = -RHS; | ||||||
2463 | goto shift_right; | ||||||
2464 | } | ||||||
2465 | shift_left: | ||||||
2466 | // C++11 [expr.shift]p1: Shift width must be less than the bit width of | ||||||
2467 | // the shifted type. | ||||||
2468 | unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); | ||||||
2469 | if (SA != RHS) { | ||||||
2470 | Info.CCEDiag(E, diag::note_constexpr_large_shift) | ||||||
2471 | << RHS << E->getType() << LHS.getBitWidth(); | ||||||
2472 | } else if (LHS.isSigned() && !Info.getLangOpts().CPlusPlus2a) { | ||||||
2473 | // C++11 [expr.shift]p2: A signed left shift must have a non-negative | ||||||
2474 | // operand, and must not overflow the corresponding unsigned type. | ||||||
2475 | // C++2a [expr.shift]p2: E1 << E2 is the unique value congruent to | ||||||
2476 | // E1 x 2^E2 module 2^N. | ||||||
2477 | if (LHS.isNegative()) | ||||||
2478 | Info.CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; | ||||||
2479 | else if (LHS.countLeadingZeros() < SA) | ||||||
2480 | Info.CCEDiag(E, diag::note_constexpr_lshift_discards); | ||||||
2481 | } | ||||||
2482 | Result = LHS << SA; | ||||||
2483 | return true; | ||||||
2484 | } | ||||||
2485 | case BO_Shr: { | ||||||
2486 | if (Info.getLangOpts().OpenCL) | ||||||
2487 | // OpenCL 6.3j: shift values are effectively % word size of LHS. | ||||||
2488 | RHS &= APSInt(llvm::APInt(RHS.getBitWidth(), | ||||||
2489 | static_cast<uint64_t>(LHS.getBitWidth() - 1)), | ||||||
2490 | RHS.isUnsigned()); | ||||||
2491 | else if (RHS.isSigned() && RHS.isNegative()) { | ||||||
2492 | // During constant-folding, a negative shift is an opposite shift. Such a | ||||||
2493 | // shift is not a constant expression. | ||||||
2494 | Info.CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; | ||||||
2495 | RHS = -RHS; | ||||||
2496 | goto shift_left; | ||||||
2497 | } | ||||||
2498 | shift_right: | ||||||
2499 | // C++11 [expr.shift]p1: Shift width must be less than the bit width of the | ||||||
2500 | // shifted type. | ||||||
2501 | unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); | ||||||
2502 | if (SA != RHS) | ||||||
2503 | Info.CCEDiag(E, diag::note_constexpr_large_shift) | ||||||
2504 | << RHS << E->getType() << LHS.getBitWidth(); | ||||||
2505 | Result = LHS >> SA; | ||||||
2506 | return true; | ||||||
2507 | } | ||||||
2508 | |||||||
2509 | case BO_LT: Result = LHS < RHS; return true; | ||||||
2510 | case BO_GT: Result = LHS > RHS; return true; | ||||||
2511 | case BO_LE: Result = LHS <= RHS; return true; | ||||||
2512 | case BO_GE: Result = LHS >= RHS; return true; | ||||||
2513 | case BO_EQ: Result = LHS == RHS; return true; | ||||||
2514 | case BO_NE: Result = LHS != RHS; return true; | ||||||
2515 | case BO_Cmp: | ||||||
2516 | llvm_unreachable("BO_Cmp should be handled elsewhere")::llvm::llvm_unreachable_internal("BO_Cmp should be handled elsewhere" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2516); | ||||||
2517 | } | ||||||
2518 | } | ||||||
2519 | |||||||
2520 | /// Perform the given binary floating-point operation, in-place, on LHS. | ||||||
2521 | static bool handleFloatFloatBinOp(EvalInfo &Info, const Expr *E, | ||||||
2522 | APFloat &LHS, BinaryOperatorKind Opcode, | ||||||
2523 | const APFloat &RHS) { | ||||||
2524 | switch (Opcode) { | ||||||
2525 | default: | ||||||
2526 | Info.FFDiag(E); | ||||||
2527 | return false; | ||||||
2528 | case BO_Mul: | ||||||
2529 | LHS.multiply(RHS, APFloat::rmNearestTiesToEven); | ||||||
2530 | break; | ||||||
2531 | case BO_Add: | ||||||
2532 | LHS.add(RHS, APFloat::rmNearestTiesToEven); | ||||||
2533 | break; | ||||||
2534 | case BO_Sub: | ||||||
2535 | LHS.subtract(RHS, APFloat::rmNearestTiesToEven); | ||||||
2536 | break; | ||||||
2537 | case BO_Div: | ||||||
2538 | // [expr.mul]p4: | ||||||
2539 | // If the second operand of / or % is zero the behavior is undefined. | ||||||
2540 | if (RHS.isZero()) | ||||||
2541 | Info.CCEDiag(E, diag::note_expr_divide_by_zero); | ||||||
2542 | LHS.divide(RHS, APFloat::rmNearestTiesToEven); | ||||||
2543 | break; | ||||||
2544 | } | ||||||
2545 | |||||||
2546 | // [expr.pre]p4: | ||||||
2547 | // If during the evaluation of an expression, the result is not | ||||||
2548 | // mathematically defined [...], the behavior is undefined. | ||||||
2549 | // FIXME: C++ rules require us to not conform to IEEE 754 here. | ||||||
2550 | if (LHS.isNaN()) { | ||||||
2551 | Info.CCEDiag(E, diag::note_constexpr_float_arithmetic) << LHS.isNaN(); | ||||||
2552 | return Info.noteUndefinedBehavior(); | ||||||
2553 | } | ||||||
2554 | return true; | ||||||
2555 | } | ||||||
2556 | |||||||
2557 | /// Cast an lvalue referring to a base subobject to a derived class, by | ||||||
2558 | /// truncating the lvalue's path to the given length. | ||||||
2559 | static bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, | ||||||
2560 | const RecordDecl *TruncatedType, | ||||||
2561 | unsigned TruncatedElements) { | ||||||
2562 | SubobjectDesignator &D = Result.Designator; | ||||||
2563 | |||||||
2564 | // Check we actually point to a derived class object. | ||||||
2565 | if (TruncatedElements == D.Entries.size()) | ||||||
2566 | return true; | ||||||
2567 | assert(TruncatedElements >= D.MostDerivedPathLength &&((TruncatedElements >= D.MostDerivedPathLength && "not casting to a derived class" ) ? static_cast<void> (0) : __assert_fail ("TruncatedElements >= D.MostDerivedPathLength && \"not casting to a derived class\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2568, __PRETTY_FUNCTION__)) | ||||||
2568 | "not casting to a derived class")((TruncatedElements >= D.MostDerivedPathLength && "not casting to a derived class" ) ? static_cast<void> (0) : __assert_fail ("TruncatedElements >= D.MostDerivedPathLength && \"not casting to a derived class\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2568, __PRETTY_FUNCTION__)); | ||||||
2569 | if (!Result.checkSubobject(Info, E, CSK_Derived)) | ||||||
2570 | return false; | ||||||
2571 | |||||||
2572 | // Truncate the path to the subobject, and remove any derived-to-base offsets. | ||||||
2573 | const RecordDecl *RD = TruncatedType; | ||||||
2574 | for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { | ||||||
2575 | if (RD->isInvalidDecl()) return false; | ||||||
2576 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | ||||||
2577 | const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); | ||||||
2578 | if (isVirtualBaseClass(D.Entries[I])) | ||||||
2579 | Result.Offset -= Layout.getVBaseClassOffset(Base); | ||||||
2580 | else | ||||||
2581 | Result.Offset -= Layout.getBaseClassOffset(Base); | ||||||
2582 | RD = Base; | ||||||
2583 | } | ||||||
2584 | D.Entries.resize(TruncatedElements); | ||||||
2585 | return true; | ||||||
2586 | } | ||||||
2587 | |||||||
2588 | static bool HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, | ||||||
2589 | const CXXRecordDecl *Derived, | ||||||
2590 | const CXXRecordDecl *Base, | ||||||
2591 | const ASTRecordLayout *RL = nullptr) { | ||||||
2592 | if (!RL) { | ||||||
2593 | if (Derived->isInvalidDecl()) return false; | ||||||
2594 | RL = &Info.Ctx.getASTRecordLayout(Derived); | ||||||
2595 | } | ||||||
2596 | |||||||
2597 | Obj.getLValueOffset() += RL->getBaseClassOffset(Base); | ||||||
2598 | Obj.addDecl(Info, E, Base, /*Virtual*/ false); | ||||||
2599 | return true; | ||||||
2600 | } | ||||||
2601 | |||||||
2602 | static bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, | ||||||
2603 | const CXXRecordDecl *DerivedDecl, | ||||||
2604 | const CXXBaseSpecifier *Base) { | ||||||
2605 | const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); | ||||||
2606 | |||||||
2607 | if (!Base->isVirtual()) | ||||||
2608 | return HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); | ||||||
2609 | |||||||
2610 | SubobjectDesignator &D = Obj.Designator; | ||||||
2611 | if (D.Invalid) | ||||||
2612 | return false; | ||||||
2613 | |||||||
2614 | // Extract most-derived object and corresponding type. | ||||||
2615 | DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); | ||||||
2616 | if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) | ||||||
2617 | return false; | ||||||
2618 | |||||||
2619 | // Find the virtual base class. | ||||||
2620 | if (DerivedDecl->isInvalidDecl()) return false; | ||||||
2621 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); | ||||||
2622 | Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); | ||||||
2623 | Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); | ||||||
2624 | return true; | ||||||
2625 | } | ||||||
2626 | |||||||
2627 | static bool HandleLValueBasePath(EvalInfo &Info, const CastExpr *E, | ||||||
2628 | QualType Type, LValue &Result) { | ||||||
2629 | for (CastExpr::path_const_iterator PathI = E->path_begin(), | ||||||
2630 | PathE = E->path_end(); | ||||||
2631 | PathI != PathE; ++PathI) { | ||||||
2632 | if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), | ||||||
2633 | *PathI)) | ||||||
2634 | return false; | ||||||
2635 | Type = (*PathI)->getType(); | ||||||
2636 | } | ||||||
2637 | return true; | ||||||
2638 | } | ||||||
2639 | |||||||
2640 | /// Cast an lvalue referring to a derived class to a known base subobject. | ||||||
2641 | static bool CastToBaseClass(EvalInfo &Info, const Expr *E, LValue &Result, | ||||||
2642 | const CXXRecordDecl *DerivedRD, | ||||||
2643 | const CXXRecordDecl *BaseRD) { | ||||||
2644 | CXXBasePaths Paths(/*FindAmbiguities=*/false, | ||||||
2645 | /*RecordPaths=*/true, /*DetectVirtual=*/false); | ||||||
2646 | if (!DerivedRD->isDerivedFrom(BaseRD, Paths)) | ||||||
2647 | llvm_unreachable("Class must be derived from the passed in base class!")::llvm::llvm_unreachable_internal("Class must be derived from the passed in base class!" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2647); | ||||||
2648 | |||||||
2649 | for (CXXBasePathElement &Elem : Paths.front()) | ||||||
2650 | if (!HandleLValueBase(Info, E, Result, Elem.Class, Elem.Base)) | ||||||
2651 | return false; | ||||||
2652 | return true; | ||||||
2653 | } | ||||||
2654 | |||||||
2655 | /// Update LVal to refer to the given field, which must be a member of the type | ||||||
2656 | /// currently described by LVal. | ||||||
2657 | static bool HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, | ||||||
2658 | const FieldDecl *FD, | ||||||
2659 | const ASTRecordLayout *RL = nullptr) { | ||||||
2660 | if (!RL) { | ||||||
2661 | if (FD->getParent()->isInvalidDecl()) return false; | ||||||
2662 | RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); | ||||||
2663 | } | ||||||
2664 | |||||||
2665 | unsigned I = FD->getFieldIndex(); | ||||||
2666 | LVal.adjustOffset(Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I))); | ||||||
2667 | LVal.addDecl(Info, E, FD); | ||||||
2668 | return true; | ||||||
2669 | } | ||||||
2670 | |||||||
2671 | /// Update LVal to refer to the given indirect field. | ||||||
2672 | static bool HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, | ||||||
2673 | LValue &LVal, | ||||||
2674 | const IndirectFieldDecl *IFD) { | ||||||
2675 | for (const auto *C : IFD->chain()) | ||||||
2676 | if (!HandleLValueMember(Info, E, LVal, cast<FieldDecl>(C))) | ||||||
2677 | return false; | ||||||
2678 | return true; | ||||||
2679 | } | ||||||
2680 | |||||||
2681 | /// Get the size of the given type in char units. | ||||||
2682 | static bool HandleSizeof(EvalInfo &Info, SourceLocation Loc, | ||||||
2683 | QualType Type, CharUnits &Size) { | ||||||
2684 | // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc | ||||||
2685 | // extension. | ||||||
2686 | if (Type->isVoidType() || Type->isFunctionType()) { | ||||||
2687 | Size = CharUnits::One(); | ||||||
2688 | return true; | ||||||
2689 | } | ||||||
2690 | |||||||
2691 | if (Type->isDependentType()) { | ||||||
2692 | Info.FFDiag(Loc); | ||||||
2693 | return false; | ||||||
2694 | } | ||||||
2695 | |||||||
2696 | if (!Type->isConstantSizeType()) { | ||||||
2697 | // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. | ||||||
2698 | // FIXME: Better diagnostic. | ||||||
2699 | Info.FFDiag(Loc); | ||||||
2700 | return false; | ||||||
2701 | } | ||||||
2702 | |||||||
2703 | Size = Info.Ctx.getTypeSizeInChars(Type); | ||||||
2704 | return true; | ||||||
2705 | } | ||||||
2706 | |||||||
2707 | /// Update a pointer value to model pointer arithmetic. | ||||||
2708 | /// \param Info - Information about the ongoing evaluation. | ||||||
2709 | /// \param E - The expression being evaluated, for diagnostic purposes. | ||||||
2710 | /// \param LVal - The pointer value to be updated. | ||||||
2711 | /// \param EltTy - The pointee type represented by LVal. | ||||||
2712 | /// \param Adjustment - The adjustment, in objects of type EltTy, to add. | ||||||
2713 | static bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, | ||||||
2714 | LValue &LVal, QualType EltTy, | ||||||
2715 | APSInt Adjustment) { | ||||||
2716 | CharUnits SizeOfPointee; | ||||||
2717 | if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee)) | ||||||
2718 | return false; | ||||||
2719 | |||||||
2720 | LVal.adjustOffsetAndIndex(Info, E, Adjustment, SizeOfPointee); | ||||||
2721 | return true; | ||||||
2722 | } | ||||||
2723 | |||||||
2724 | static bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, | ||||||
2725 | LValue &LVal, QualType EltTy, | ||||||
2726 | int64_t Adjustment) { | ||||||
2727 | return HandleLValueArrayAdjustment(Info, E, LVal, EltTy, | ||||||
2728 | APSInt::get(Adjustment)); | ||||||
2729 | } | ||||||
2730 | |||||||
2731 | /// Update an lvalue to refer to a component of a complex number. | ||||||
2732 | /// \param Info - Information about the ongoing evaluation. | ||||||
2733 | /// \param LVal - The lvalue to be updated. | ||||||
2734 | /// \param EltTy - The complex number's component type. | ||||||
2735 | /// \param Imag - False for the real component, true for the imaginary. | ||||||
2736 | static bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E, | ||||||
2737 | LValue &LVal, QualType EltTy, | ||||||
2738 | bool Imag) { | ||||||
2739 | if (Imag) { | ||||||
2740 | CharUnits SizeOfComponent; | ||||||
2741 | if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent)) | ||||||
2742 | return false; | ||||||
2743 | LVal.Offset += SizeOfComponent; | ||||||
2744 | } | ||||||
2745 | LVal.addComplex(Info, E, EltTy, Imag); | ||||||
2746 | return true; | ||||||
2747 | } | ||||||
2748 | |||||||
2749 | /// Try to evaluate the initializer for a variable declaration. | ||||||
2750 | /// | ||||||
2751 | /// \param Info Information about the ongoing evaluation. | ||||||
2752 | /// \param E An expression to be used when printing diagnostics. | ||||||
2753 | /// \param VD The variable whose initializer should be obtained. | ||||||
2754 | /// \param Frame The frame in which the variable was created. Must be null | ||||||
2755 | /// if this variable is not local to the evaluation. | ||||||
2756 | /// \param Result Filled in with a pointer to the value of the variable. | ||||||
2757 | static bool evaluateVarDeclInit(EvalInfo &Info, const Expr *E, | ||||||
2758 | const VarDecl *VD, CallStackFrame *Frame, | ||||||
2759 | APValue *&Result, const LValue *LVal) { | ||||||
2760 | |||||||
2761 | // If this is a parameter to an active constexpr function call, perform | ||||||
2762 | // argument substitution. | ||||||
2763 | if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) { | ||||||
2764 | // Assume arguments of a potential constant expression are unknown | ||||||
2765 | // constant expressions. | ||||||
2766 | if (Info.checkingPotentialConstantExpression()) | ||||||
2767 | return false; | ||||||
2768 | if (!Frame || !Frame->Arguments) { | ||||||
2769 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
2770 | return false; | ||||||
2771 | } | ||||||
2772 | Result = &Frame->Arguments[PVD->getFunctionScopeIndex()]; | ||||||
2773 | return true; | ||||||
2774 | } | ||||||
2775 | |||||||
2776 | // If this is a local variable, dig out its value. | ||||||
2777 | if (Frame) { | ||||||
2778 | Result = LVal ? Frame->getTemporary(VD, LVal->getLValueVersion()) | ||||||
2779 | : Frame->getCurrentTemporary(VD); | ||||||
2780 | if (!Result) { | ||||||
2781 | // Assume variables referenced within a lambda's call operator that were | ||||||
2782 | // not declared within the call operator are captures and during checking | ||||||
2783 | // of a potential constant expression, assume they are unknown constant | ||||||
2784 | // expressions. | ||||||
2785 | assert(isLambdaCallOperator(Frame->Callee) &&((isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext () != Frame->Callee || VD->isInitCapture()) && "missing value for local variable" ) ? static_cast<void> (0) : __assert_fail ("isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) && \"missing value for local variable\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2787, __PRETTY_FUNCTION__)) | ||||||
2786 | (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) &&((isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext () != Frame->Callee || VD->isInitCapture()) && "missing value for local variable" ) ? static_cast<void> (0) : __assert_fail ("isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) && \"missing value for local variable\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2787, __PRETTY_FUNCTION__)) | ||||||
2787 | "missing value for local variable")((isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext () != Frame->Callee || VD->isInitCapture()) && "missing value for local variable" ) ? static_cast<void> (0) : __assert_fail ("isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) && \"missing value for local variable\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2787, __PRETTY_FUNCTION__)); | ||||||
2788 | if (Info.checkingPotentialConstantExpression()) | ||||||
2789 | return false; | ||||||
2790 | // FIXME: implement capture evaluation during constant expr evaluation. | ||||||
2791 | Info.FFDiag(E->getBeginLoc(), | ||||||
2792 | diag::note_unimplemented_constexpr_lambda_feature_ast) | ||||||
2793 | << "captures not currently allowed"; | ||||||
2794 | return false; | ||||||
2795 | } | ||||||
2796 | return true; | ||||||
2797 | } | ||||||
2798 | |||||||
2799 | // Dig out the initializer, and use the declaration which it's attached to. | ||||||
2800 | const Expr *Init = VD->getAnyInitializer(VD); | ||||||
2801 | if (!Init || Init->isValueDependent()) { | ||||||
2802 | // If we're checking a potential constant expression, the variable could be | ||||||
2803 | // initialized later. | ||||||
2804 | if (!Info.checkingPotentialConstantExpression()) | ||||||
2805 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
2806 | return false; | ||||||
2807 | } | ||||||
2808 | |||||||
2809 | // If we're currently evaluating the initializer of this declaration, use that | ||||||
2810 | // in-flight value. | ||||||
2811 | if (Info.EvaluatingDecl.dyn_cast<const ValueDecl*>() == VD) { | ||||||
2812 | Result = Info.EvaluatingDeclValue; | ||||||
2813 | return true; | ||||||
2814 | } | ||||||
2815 | |||||||
2816 | // Never evaluate the initializer of a weak variable. We can't be sure that | ||||||
2817 | // this is the definition which will be used. | ||||||
2818 | if (VD->isWeak()) { | ||||||
2819 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
2820 | return false; | ||||||
2821 | } | ||||||
2822 | |||||||
2823 | // Check that we can fold the initializer. In C++, we will have already done | ||||||
2824 | // this in the cases where it matters for conformance. | ||||||
2825 | SmallVector<PartialDiagnosticAt, 8> Notes; | ||||||
2826 | if (!VD->evaluateValue(Notes)) { | ||||||
2827 | Info.FFDiag(E, diag::note_constexpr_var_init_non_constant, | ||||||
2828 | Notes.size() + 1) << VD; | ||||||
2829 | Info.Note(VD->getLocation(), diag::note_declared_at); | ||||||
2830 | Info.addNotes(Notes); | ||||||
2831 | return false; | ||||||
2832 | } else if (!VD->checkInitIsICE()) { | ||||||
2833 | Info.CCEDiag(E, diag::note_constexpr_var_init_non_constant, | ||||||
2834 | Notes.size() + 1) << VD; | ||||||
2835 | Info.Note(VD->getLocation(), diag::note_declared_at); | ||||||
2836 | Info.addNotes(Notes); | ||||||
2837 | } | ||||||
2838 | |||||||
2839 | Result = VD->getEvaluatedValue(); | ||||||
2840 | return true; | ||||||
2841 | } | ||||||
2842 | |||||||
2843 | static bool IsConstNonVolatile(QualType T) { | ||||||
2844 | Qualifiers Quals = T.getQualifiers(); | ||||||
2845 | return Quals.hasConst() && !Quals.hasVolatile(); | ||||||
2846 | } | ||||||
2847 | |||||||
2848 | /// Get the base index of the given base class within an APValue representing | ||||||
2849 | /// the given derived class. | ||||||
2850 | static unsigned getBaseIndex(const CXXRecordDecl *Derived, | ||||||
2851 | const CXXRecordDecl *Base) { | ||||||
2852 | Base = Base->getCanonicalDecl(); | ||||||
2853 | unsigned Index = 0; | ||||||
2854 | for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), | ||||||
2855 | E = Derived->bases_end(); I != E; ++I, ++Index) { | ||||||
2856 | if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) | ||||||
2857 | return Index; | ||||||
2858 | } | ||||||
2859 | |||||||
2860 | llvm_unreachable("base class missing from derived class's bases list")::llvm::llvm_unreachable_internal("base class missing from derived class's bases list" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2860); | ||||||
2861 | } | ||||||
2862 | |||||||
2863 | /// Extract the value of a character from a string literal. | ||||||
2864 | static APSInt extractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit, | ||||||
2865 | uint64_t Index) { | ||||||
2866 | assert(!isa<SourceLocExpr>(Lit) &&((!isa<SourceLocExpr>(Lit) && "SourceLocExpr should have already been converted to a StringLiteral" ) ? static_cast<void> (0) : __assert_fail ("!isa<SourceLocExpr>(Lit) && \"SourceLocExpr should have already been converted to a StringLiteral\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2867, __PRETTY_FUNCTION__)) | ||||||
2867 | "SourceLocExpr should have already been converted to a StringLiteral")((!isa<SourceLocExpr>(Lit) && "SourceLocExpr should have already been converted to a StringLiteral" ) ? static_cast<void> (0) : __assert_fail ("!isa<SourceLocExpr>(Lit) && \"SourceLocExpr should have already been converted to a StringLiteral\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2867, __PRETTY_FUNCTION__)); | ||||||
2868 | |||||||
2869 | // FIXME: Support MakeStringConstant | ||||||
2870 | if (const auto *ObjCEnc = dyn_cast<ObjCEncodeExpr>(Lit)) { | ||||||
2871 | std::string Str; | ||||||
2872 | Info.Ctx.getObjCEncodingForType(ObjCEnc->getEncodedType(), Str); | ||||||
2873 | assert(Index <= Str.size() && "Index too large")((Index <= Str.size() && "Index too large") ? static_cast <void> (0) : __assert_fail ("Index <= Str.size() && \"Index too large\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2873, __PRETTY_FUNCTION__)); | ||||||
2874 | return APSInt::getUnsigned(Str.c_str()[Index]); | ||||||
2875 | } | ||||||
2876 | |||||||
2877 | if (auto PE = dyn_cast<PredefinedExpr>(Lit)) | ||||||
2878 | Lit = PE->getFunctionName(); | ||||||
2879 | const StringLiteral *S = cast<StringLiteral>(Lit); | ||||||
2880 | const ConstantArrayType *CAT = | ||||||
2881 | Info.Ctx.getAsConstantArrayType(S->getType()); | ||||||
2882 | assert(CAT && "string literal isn't an array")((CAT && "string literal isn't an array") ? static_cast <void> (0) : __assert_fail ("CAT && \"string literal isn't an array\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2882, __PRETTY_FUNCTION__)); | ||||||
2883 | QualType CharType = CAT->getElementType(); | ||||||
2884 | assert(CharType->isIntegerType() && "unexpected character type")((CharType->isIntegerType() && "unexpected character type" ) ? static_cast<void> (0) : __assert_fail ("CharType->isIntegerType() && \"unexpected character type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2884, __PRETTY_FUNCTION__)); | ||||||
2885 | |||||||
2886 | APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), | ||||||
2887 | CharType->isUnsignedIntegerType()); | ||||||
2888 | if (Index < S->getLength()) | ||||||
2889 | Value = S->getCodeUnit(Index); | ||||||
2890 | return Value; | ||||||
2891 | } | ||||||
2892 | |||||||
2893 | // Expand a string literal into an array of characters. | ||||||
2894 | // | ||||||
2895 | // FIXME: This is inefficient; we should probably introduce something similar | ||||||
2896 | // to the LLVM ConstantDataArray to make this cheaper. | ||||||
2897 | static void expandStringLiteral(EvalInfo &Info, const StringLiteral *S, | ||||||
2898 | APValue &Result, | ||||||
2899 | QualType AllocType = QualType()) { | ||||||
2900 | const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType( | ||||||
2901 | AllocType.isNull() ? S->getType() : AllocType); | ||||||
2902 | assert(CAT && "string literal isn't an array")((CAT && "string literal isn't an array") ? static_cast <void> (0) : __assert_fail ("CAT && \"string literal isn't an array\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2902, __PRETTY_FUNCTION__)); | ||||||
2903 | QualType CharType = CAT->getElementType(); | ||||||
2904 | assert(CharType->isIntegerType() && "unexpected character type")((CharType->isIntegerType() && "unexpected character type" ) ? static_cast<void> (0) : __assert_fail ("CharType->isIntegerType() && \"unexpected character type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2904, __PRETTY_FUNCTION__)); | ||||||
2905 | |||||||
2906 | unsigned Elts = CAT->getSize().getZExtValue(); | ||||||
2907 | Result = APValue(APValue::UninitArray(), | ||||||
2908 | std::min(S->getLength(), Elts), Elts); | ||||||
2909 | APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), | ||||||
2910 | CharType->isUnsignedIntegerType()); | ||||||
2911 | if (Result.hasArrayFiller()) | ||||||
2912 | Result.getArrayFiller() = APValue(Value); | ||||||
2913 | for (unsigned I = 0, N = Result.getArrayInitializedElts(); I != N; ++I) { | ||||||
2914 | Value = S->getCodeUnit(I); | ||||||
2915 | Result.getArrayInitializedElt(I) = APValue(Value); | ||||||
2916 | } | ||||||
2917 | } | ||||||
2918 | |||||||
2919 | // Expand an array so that it has more than Index filled elements. | ||||||
2920 | static void expandArray(APValue &Array, unsigned Index) { | ||||||
2921 | unsigned Size = Array.getArraySize(); | ||||||
2922 | assert(Index < Size)((Index < Size) ? static_cast<void> (0) : __assert_fail ("Index < Size", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 2922, __PRETTY_FUNCTION__)); | ||||||
2923 | |||||||
2924 | // Always at least double the number of elements for which we store a value. | ||||||
2925 | unsigned OldElts = Array.getArrayInitializedElts(); | ||||||
2926 | unsigned NewElts = std::max(Index+1, OldElts * 2); | ||||||
2927 | NewElts = std::min(Size, std::max(NewElts, 8u)); | ||||||
2928 | |||||||
2929 | // Copy the data across. | ||||||
2930 | APValue NewValue(APValue::UninitArray(), NewElts, Size); | ||||||
2931 | for (unsigned I = 0; I != OldElts; ++I) | ||||||
2932 | NewValue.getArrayInitializedElt(I).swap(Array.getArrayInitializedElt(I)); | ||||||
2933 | for (unsigned I = OldElts; I != NewElts; ++I) | ||||||
2934 | NewValue.getArrayInitializedElt(I) = Array.getArrayFiller(); | ||||||
2935 | if (NewValue.hasArrayFiller()) | ||||||
2936 | NewValue.getArrayFiller() = Array.getArrayFiller(); | ||||||
2937 | Array.swap(NewValue); | ||||||
2938 | } | ||||||
2939 | |||||||
2940 | /// Determine whether a type would actually be read by an lvalue-to-rvalue | ||||||
2941 | /// conversion. If it's of class type, we may assume that the copy operation | ||||||
2942 | /// is trivial. Note that this is never true for a union type with fields | ||||||
2943 | /// (because the copy always "reads" the active member) and always true for | ||||||
2944 | /// a non-class type. | ||||||
2945 | static bool isReadByLvalueToRvalueConversion(QualType T) { | ||||||
2946 | CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); | ||||||
2947 | if (!RD || (RD->isUnion() && !RD->field_empty())) | ||||||
2948 | return true; | ||||||
2949 | if (RD->isEmpty()) | ||||||
2950 | return false; | ||||||
2951 | |||||||
2952 | for (auto *Field : RD->fields()) | ||||||
2953 | if (isReadByLvalueToRvalueConversion(Field->getType())) | ||||||
2954 | return true; | ||||||
2955 | |||||||
2956 | for (auto &BaseSpec : RD->bases()) | ||||||
2957 | if (isReadByLvalueToRvalueConversion(BaseSpec.getType())) | ||||||
2958 | return true; | ||||||
2959 | |||||||
2960 | return false; | ||||||
2961 | } | ||||||
2962 | |||||||
2963 | /// Diagnose an attempt to read from any unreadable field within the specified | ||||||
2964 | /// type, which might be a class type. | ||||||
2965 | static bool diagnoseMutableFields(EvalInfo &Info, const Expr *E, AccessKinds AK, | ||||||
2966 | QualType T) { | ||||||
2967 | CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); | ||||||
2968 | if (!RD) | ||||||
2969 | return false; | ||||||
2970 | |||||||
2971 | if (!RD->hasMutableFields()) | ||||||
2972 | return false; | ||||||
2973 | |||||||
2974 | for (auto *Field : RD->fields()) { | ||||||
2975 | // If we're actually going to read this field in some way, then it can't | ||||||
2976 | // be mutable. If we're in a union, then assigning to a mutable field | ||||||
2977 | // (even an empty one) can change the active member, so that's not OK. | ||||||
2978 | // FIXME: Add core issue number for the union case. | ||||||
2979 | if (Field->isMutable() && | ||||||
2980 | (RD->isUnion() || isReadByLvalueToRvalueConversion(Field->getType()))) { | ||||||
2981 | Info.FFDiag(E, diag::note_constexpr_access_mutable, 1) << AK << Field; | ||||||
2982 | Info.Note(Field->getLocation(), diag::note_declared_at); | ||||||
2983 | return true; | ||||||
2984 | } | ||||||
2985 | |||||||
2986 | if (diagnoseMutableFields(Info, E, AK, Field->getType())) | ||||||
2987 | return true; | ||||||
2988 | } | ||||||
2989 | |||||||
2990 | for (auto &BaseSpec : RD->bases()) | ||||||
2991 | if (diagnoseMutableFields(Info, E, AK, BaseSpec.getType())) | ||||||
2992 | return true; | ||||||
2993 | |||||||
2994 | // All mutable fields were empty, and thus not actually read. | ||||||
2995 | return false; | ||||||
2996 | } | ||||||
2997 | |||||||
2998 | static bool lifetimeStartedInEvaluation(EvalInfo &Info, | ||||||
2999 | APValue::LValueBase Base, | ||||||
3000 | bool MutableSubobject = false) { | ||||||
3001 | // A temporary we created. | ||||||
3002 | if (Base.getCallIndex()) | ||||||
3003 | return true; | ||||||
3004 | |||||||
3005 | auto *Evaluating = Info.EvaluatingDecl.dyn_cast<const ValueDecl*>(); | ||||||
3006 | if (!Evaluating) | ||||||
3007 | return false; | ||||||
3008 | |||||||
3009 | auto *BaseD = Base.dyn_cast<const ValueDecl*>(); | ||||||
3010 | |||||||
3011 | switch (Info.IsEvaluatingDecl) { | ||||||
3012 | case EvalInfo::EvaluatingDeclKind::None: | ||||||
3013 | return false; | ||||||
3014 | |||||||
3015 | case EvalInfo::EvaluatingDeclKind::Ctor: | ||||||
3016 | // The variable whose initializer we're evaluating. | ||||||
3017 | if (BaseD) | ||||||
3018 | return declaresSameEntity(Evaluating, BaseD); | ||||||
3019 | |||||||
3020 | // A temporary lifetime-extended by the variable whose initializer we're | ||||||
3021 | // evaluating. | ||||||
3022 | if (auto *BaseE = Base.dyn_cast<const Expr *>()) | ||||||
3023 | if (auto *BaseMTE = dyn_cast<MaterializeTemporaryExpr>(BaseE)) | ||||||
3024 | return declaresSameEntity(BaseMTE->getExtendingDecl(), Evaluating); | ||||||
3025 | return false; | ||||||
3026 | |||||||
3027 | case EvalInfo::EvaluatingDeclKind::Dtor: | ||||||
3028 | // C++2a [expr.const]p6: | ||||||
3029 | // [during constant destruction] the lifetime of a and its non-mutable | ||||||
3030 | // subobjects (but not its mutable subobjects) [are] considered to start | ||||||
3031 | // within e. | ||||||
3032 | // | ||||||
3033 | // FIXME: We can meaningfully extend this to cover non-const objects, but | ||||||
3034 | // we will need special handling: we should be able to access only | ||||||
3035 | // subobjects of such objects that are themselves declared const. | ||||||
3036 | if (!BaseD || | ||||||
3037 | !(BaseD->getType().isConstQualified() || | ||||||
3038 | BaseD->getType()->isReferenceType()) || | ||||||
3039 | MutableSubobject) | ||||||
3040 | return false; | ||||||
3041 | return declaresSameEntity(Evaluating, BaseD); | ||||||
3042 | } | ||||||
3043 | |||||||
3044 | llvm_unreachable("unknown evaluating decl kind")::llvm::llvm_unreachable_internal("unknown evaluating decl kind" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3044); | ||||||
3045 | } | ||||||
3046 | |||||||
3047 | namespace { | ||||||
3048 | /// A handle to a complete object (an object that is not a subobject of | ||||||
3049 | /// another object). | ||||||
3050 | struct CompleteObject { | ||||||
3051 | /// The identity of the object. | ||||||
3052 | APValue::LValueBase Base; | ||||||
3053 | /// The value of the complete object. | ||||||
3054 | APValue *Value; | ||||||
3055 | /// The type of the complete object. | ||||||
3056 | QualType Type; | ||||||
3057 | |||||||
3058 | CompleteObject() : Value(nullptr) {} | ||||||
3059 | CompleteObject(APValue::LValueBase Base, APValue *Value, QualType Type) | ||||||
3060 | : Base(Base), Value(Value), Type(Type) {} | ||||||
3061 | |||||||
3062 | bool mayAccessMutableMembers(EvalInfo &Info, AccessKinds AK) const { | ||||||
3063 | // In C++14 onwards, it is permitted to read a mutable member whose | ||||||
3064 | // lifetime began within the evaluation. | ||||||
3065 | // FIXME: Should we also allow this in C++11? | ||||||
3066 | if (!Info.getLangOpts().CPlusPlus14) | ||||||
3067 | return false; | ||||||
3068 | return lifetimeStartedInEvaluation(Info, Base, /*MutableSubobject*/true); | ||||||
3069 | } | ||||||
3070 | |||||||
3071 | explicit operator bool() const { return !Type.isNull(); } | ||||||
3072 | }; | ||||||
3073 | } // end anonymous namespace | ||||||
3074 | |||||||
3075 | static QualType getSubobjectType(QualType ObjType, QualType SubobjType, | ||||||
3076 | bool IsMutable = false) { | ||||||
3077 | // C++ [basic.type.qualifier]p1: | ||||||
3078 | // - A const object is an object of type const T or a non-mutable subobject | ||||||
3079 | // of a const object. | ||||||
3080 | if (ObjType.isConstQualified() && !IsMutable) | ||||||
3081 | SubobjType.addConst(); | ||||||
3082 | // - A volatile object is an object of type const T or a subobject of a | ||||||
3083 | // volatile object. | ||||||
3084 | if (ObjType.isVolatileQualified()) | ||||||
3085 | SubobjType.addVolatile(); | ||||||
3086 | return SubobjType; | ||||||
3087 | } | ||||||
3088 | |||||||
3089 | /// Find the designated sub-object of an rvalue. | ||||||
3090 | template<typename SubobjectHandler> | ||||||
3091 | typename SubobjectHandler::result_type | ||||||
3092 | findSubobject(EvalInfo &Info, const Expr *E, const CompleteObject &Obj, | ||||||
3093 | const SubobjectDesignator &Sub, SubobjectHandler &handler) { | ||||||
3094 | if (Sub.Invalid) | ||||||
3095 | // A diagnostic will have already been produced. | ||||||
3096 | return handler.failed(); | ||||||
3097 | if (Sub.isOnePastTheEnd() || Sub.isMostDerivedAnUnsizedArray()) { | ||||||
3098 | if (Info.getLangOpts().CPlusPlus11) | ||||||
3099 | Info.FFDiag(E, Sub.isOnePastTheEnd() | ||||||
3100 | ? diag::note_constexpr_access_past_end | ||||||
3101 | : diag::note_constexpr_access_unsized_array) | ||||||
3102 | << handler.AccessKind; | ||||||
3103 | else | ||||||
3104 | Info.FFDiag(E); | ||||||
3105 | return handler.failed(); | ||||||
3106 | } | ||||||
3107 | |||||||
3108 | APValue *O = Obj.Value; | ||||||
3109 | QualType ObjType = Obj.Type; | ||||||
3110 | const FieldDecl *LastField = nullptr; | ||||||
3111 | const FieldDecl *VolatileField = nullptr; | ||||||
3112 | |||||||
3113 | // Walk the designator's path to find the subobject. | ||||||
3114 | for (unsigned I = 0, N = Sub.Entries.size(); /**/; ++I) { | ||||||
3115 | // Reading an indeterminate value is undefined, but assigning over one is OK. | ||||||
3116 | if (O->isAbsent() || | ||||||
3117 | (O->isIndeterminate() && handler.AccessKind != AK_Assign && | ||||||
3118 | handler.AccessKind != AK_ReadObjectRepresentation)) { | ||||||
3119 | if (!Info.checkingPotentialConstantExpression()) | ||||||
3120 | Info.FFDiag(E, diag::note_constexpr_access_uninit) | ||||||
3121 | << handler.AccessKind << O->isIndeterminate(); | ||||||
3122 | return handler.failed(); | ||||||
3123 | } | ||||||
3124 | |||||||
3125 | // C++ [class.ctor]p5, C++ [class.dtor]p5: | ||||||
3126 | // const and volatile semantics are not applied on an object under | ||||||
3127 | // {con,de}struction. | ||||||
3128 | if ((ObjType.isConstQualified() || ObjType.isVolatileQualified()) && | ||||||
3129 | ObjType->isRecordType() && | ||||||
3130 | Info.isEvaluatingCtorDtor( | ||||||
3131 | Obj.Base, llvm::makeArrayRef(Sub.Entries.begin(), | ||||||
3132 | Sub.Entries.begin() + I)) != | ||||||
3133 | ConstructionPhase::None) { | ||||||
3134 | ObjType = Info.Ctx.getCanonicalType(ObjType); | ||||||
3135 | ObjType.removeLocalConst(); | ||||||
3136 | ObjType.removeLocalVolatile(); | ||||||
3137 | } | ||||||
3138 | |||||||
3139 | // If this is our last pass, check that the final object type is OK. | ||||||
3140 | if (I == N || (I == N - 1 && ObjType->isAnyComplexType())) { | ||||||
3141 | // Accesses to volatile objects are prohibited. | ||||||
3142 | if (ObjType.isVolatileQualified() && isFormalAccess(handler.AccessKind)) { | ||||||
3143 | if (Info.getLangOpts().CPlusPlus) { | ||||||
3144 | int DiagKind; | ||||||
3145 | SourceLocation Loc; | ||||||
3146 | const NamedDecl *Decl = nullptr; | ||||||
3147 | if (VolatileField) { | ||||||
3148 | DiagKind = 2; | ||||||
3149 | Loc = VolatileField->getLocation(); | ||||||
3150 | Decl = VolatileField; | ||||||
3151 | } else if (auto *VD = Obj.Base.dyn_cast<const ValueDecl*>()) { | ||||||
3152 | DiagKind = 1; | ||||||
3153 | Loc = VD->getLocation(); | ||||||
3154 | Decl = VD; | ||||||
3155 | } else { | ||||||
3156 | DiagKind = 0; | ||||||
3157 | if (auto *E = Obj.Base.dyn_cast<const Expr *>()) | ||||||
3158 | Loc = E->getExprLoc(); | ||||||
3159 | } | ||||||
3160 | Info.FFDiag(E, diag::note_constexpr_access_volatile_obj, 1) | ||||||
3161 | << handler.AccessKind << DiagKind << Decl; | ||||||
3162 | Info.Note(Loc, diag::note_constexpr_volatile_here) << DiagKind; | ||||||
3163 | } else { | ||||||
3164 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
3165 | } | ||||||
3166 | return handler.failed(); | ||||||
3167 | } | ||||||
3168 | |||||||
3169 | // If we are reading an object of class type, there may still be more | ||||||
3170 | // things we need to check: if there are any mutable subobjects, we | ||||||
3171 | // cannot perform this read. (This only happens when performing a trivial | ||||||
3172 | // copy or assignment.) | ||||||
3173 | if (ObjType->isRecordType() && | ||||||
3174 | !Obj.mayAccessMutableMembers(Info, handler.AccessKind) && | ||||||
3175 | diagnoseMutableFields(Info, E, handler.AccessKind, ObjType)) | ||||||
3176 | return handler.failed(); | ||||||
3177 | } | ||||||
3178 | |||||||
3179 | if (I == N) { | ||||||
3180 | if (!handler.found(*O, ObjType)) | ||||||
3181 | return false; | ||||||
3182 | |||||||
3183 | // If we modified a bit-field, truncate it to the right width. | ||||||
3184 | if (isModification(handler.AccessKind) && | ||||||
3185 | LastField && LastField->isBitField() && | ||||||
3186 | !truncateBitfieldValue(Info, E, *O, LastField)) | ||||||
3187 | return false; | ||||||
3188 | |||||||
3189 | return true; | ||||||
3190 | } | ||||||
3191 | |||||||
3192 | LastField = nullptr; | ||||||
3193 | if (ObjType->isArrayType()) { | ||||||
3194 | // Next subobject is an array element. | ||||||
3195 | const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); | ||||||
3196 | assert(CAT && "vla in literal type?")((CAT && "vla in literal type?") ? static_cast<void > (0) : __assert_fail ("CAT && \"vla in literal type?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3196, __PRETTY_FUNCTION__)); | ||||||
3197 | uint64_t Index = Sub.Entries[I].getAsArrayIndex(); | ||||||
3198 | if (CAT->getSize().ule(Index)) { | ||||||
3199 | // Note, it should not be possible to form a pointer with a valid | ||||||
3200 | // designator which points more than one past the end of the array. | ||||||
3201 | if (Info.getLangOpts().CPlusPlus11) | ||||||
3202 | Info.FFDiag(E, diag::note_constexpr_access_past_end) | ||||||
3203 | << handler.AccessKind; | ||||||
3204 | else | ||||||
3205 | Info.FFDiag(E); | ||||||
3206 | return handler.failed(); | ||||||
3207 | } | ||||||
3208 | |||||||
3209 | ObjType = CAT->getElementType(); | ||||||
3210 | |||||||
3211 | if (O->getArrayInitializedElts() > Index) | ||||||
3212 | O = &O->getArrayInitializedElt(Index); | ||||||
3213 | else if (!isRead(handler.AccessKind)) { | ||||||
3214 | expandArray(*O, Index); | ||||||
3215 | O = &O->getArrayInitializedElt(Index); | ||||||
3216 | } else | ||||||
3217 | O = &O->getArrayFiller(); | ||||||
3218 | } else if (ObjType->isAnyComplexType()) { | ||||||
3219 | // Next subobject is a complex number. | ||||||
3220 | uint64_t Index = Sub.Entries[I].getAsArrayIndex(); | ||||||
3221 | if (Index > 1) { | ||||||
3222 | if (Info.getLangOpts().CPlusPlus11) | ||||||
3223 | Info.FFDiag(E, diag::note_constexpr_access_past_end) | ||||||
3224 | << handler.AccessKind; | ||||||
3225 | else | ||||||
3226 | Info.FFDiag(E); | ||||||
3227 | return handler.failed(); | ||||||
3228 | } | ||||||
3229 | |||||||
3230 | ObjType = getSubobjectType( | ||||||
3231 | ObjType, ObjType->castAs<ComplexType>()->getElementType()); | ||||||
3232 | |||||||
3233 | assert(I == N - 1 && "extracting subobject of scalar?")((I == N - 1 && "extracting subobject of scalar?") ? static_cast <void> (0) : __assert_fail ("I == N - 1 && \"extracting subobject of scalar?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3233, __PRETTY_FUNCTION__)); | ||||||
3234 | if (O->isComplexInt()) { | ||||||
3235 | return handler.found(Index ? O->getComplexIntImag() | ||||||
3236 | : O->getComplexIntReal(), ObjType); | ||||||
3237 | } else { | ||||||
3238 | assert(O->isComplexFloat())((O->isComplexFloat()) ? static_cast<void> (0) : __assert_fail ("O->isComplexFloat()", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3238, __PRETTY_FUNCTION__)); | ||||||
3239 | return handler.found(Index ? O->getComplexFloatImag() | ||||||
3240 | : O->getComplexFloatReal(), ObjType); | ||||||
3241 | } | ||||||
3242 | } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { | ||||||
3243 | if (Field->isMutable() && | ||||||
3244 | !Obj.mayAccessMutableMembers(Info, handler.AccessKind)) { | ||||||
3245 | Info.FFDiag(E, diag::note_constexpr_access_mutable, 1) | ||||||
3246 | << handler.AccessKind << Field; | ||||||
3247 | Info.Note(Field->getLocation(), diag::note_declared_at); | ||||||
3248 | return handler.failed(); | ||||||
3249 | } | ||||||
3250 | |||||||
3251 | // Next subobject is a class, struct or union field. | ||||||
3252 | RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); | ||||||
3253 | if (RD->isUnion()) { | ||||||
3254 | const FieldDecl *UnionField = O->getUnionField(); | ||||||
3255 | if (!UnionField || | ||||||
3256 | UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { | ||||||
3257 | // FIXME: If O->getUnionValue() is absent, report that there's no | ||||||
3258 | // active union member rather than reporting the prior active union | ||||||
3259 | // member. We'll need to fix nullptr_t to not use APValue() as its | ||||||
3260 | // representation first. | ||||||
3261 | Info.FFDiag(E, diag::note_constexpr_access_inactive_union_member) | ||||||
3262 | << handler.AccessKind << Field << !UnionField << UnionField; | ||||||
3263 | return handler.failed(); | ||||||
3264 | } | ||||||
3265 | O = &O->getUnionValue(); | ||||||
3266 | } else | ||||||
3267 | O = &O->getStructField(Field->getFieldIndex()); | ||||||
3268 | |||||||
3269 | ObjType = getSubobjectType(ObjType, Field->getType(), Field->isMutable()); | ||||||
3270 | LastField = Field; | ||||||
3271 | if (Field->getType().isVolatileQualified()) | ||||||
3272 | VolatileField = Field; | ||||||
3273 | } else { | ||||||
3274 | // Next subobject is a base class. | ||||||
3275 | const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); | ||||||
3276 | const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); | ||||||
3277 | O = &O->getStructBase(getBaseIndex(Derived, Base)); | ||||||
3278 | |||||||
3279 | ObjType = getSubobjectType(ObjType, Info.Ctx.getRecordType(Base)); | ||||||
3280 | } | ||||||
3281 | } | ||||||
3282 | } | ||||||
3283 | |||||||
3284 | namespace { | ||||||
3285 | struct ExtractSubobjectHandler { | ||||||
3286 | EvalInfo &Info; | ||||||
3287 | const Expr *E; | ||||||
3288 | APValue &Result; | ||||||
3289 | const AccessKinds AccessKind; | ||||||
3290 | |||||||
3291 | typedef bool result_type; | ||||||
3292 | bool failed() { return false; } | ||||||
3293 | bool found(APValue &Subobj, QualType SubobjType) { | ||||||
3294 | Result = Subobj; | ||||||
3295 | if (AccessKind == AK_ReadObjectRepresentation) | ||||||
3296 | return true; | ||||||
3297 | return CheckFullyInitialized(Info, E->getExprLoc(), SubobjType, Result); | ||||||
3298 | } | ||||||
3299 | bool found(APSInt &Value, QualType SubobjType) { | ||||||
3300 | Result = APValue(Value); | ||||||
3301 | return true; | ||||||
3302 | } | ||||||
3303 | bool found(APFloat &Value, QualType SubobjType) { | ||||||
3304 | Result = APValue(Value); | ||||||
3305 | return true; | ||||||
3306 | } | ||||||
3307 | }; | ||||||
3308 | } // end anonymous namespace | ||||||
3309 | |||||||
3310 | /// Extract the designated sub-object of an rvalue. | ||||||
3311 | static bool extractSubobject(EvalInfo &Info, const Expr *E, | ||||||
3312 | const CompleteObject &Obj, | ||||||
3313 | const SubobjectDesignator &Sub, APValue &Result, | ||||||
3314 | AccessKinds AK = AK_Read) { | ||||||
3315 | assert(AK == AK_Read || AK == AK_ReadObjectRepresentation)((AK == AK_Read || AK == AK_ReadObjectRepresentation) ? static_cast <void> (0) : __assert_fail ("AK == AK_Read || AK == AK_ReadObjectRepresentation" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3315, __PRETTY_FUNCTION__)); | ||||||
3316 | ExtractSubobjectHandler Handler = {Info, E, Result, AK}; | ||||||
3317 | return findSubobject(Info, E, Obj, Sub, Handler); | ||||||
3318 | } | ||||||
3319 | |||||||
3320 | namespace { | ||||||
3321 | struct ModifySubobjectHandler { | ||||||
3322 | EvalInfo &Info; | ||||||
3323 | APValue &NewVal; | ||||||
3324 | const Expr *E; | ||||||
3325 | |||||||
3326 | typedef bool result_type; | ||||||
3327 | static const AccessKinds AccessKind = AK_Assign; | ||||||
3328 | |||||||
3329 | bool checkConst(QualType QT) { | ||||||
3330 | // Assigning to a const object has undefined behavior. | ||||||
3331 | if (QT.isConstQualified()) { | ||||||
3332 | Info.FFDiag(E, diag::note_constexpr_modify_const_type) << QT; | ||||||
3333 | return false; | ||||||
3334 | } | ||||||
3335 | return true; | ||||||
3336 | } | ||||||
3337 | |||||||
3338 | bool failed() { return false; } | ||||||
3339 | bool found(APValue &Subobj, QualType SubobjType) { | ||||||
3340 | if (!checkConst(SubobjType)) | ||||||
3341 | return false; | ||||||
3342 | // We've been given ownership of NewVal, so just swap it in. | ||||||
3343 | Subobj.swap(NewVal); | ||||||
3344 | return true; | ||||||
3345 | } | ||||||
3346 | bool found(APSInt &Value, QualType SubobjType) { | ||||||
3347 | if (!checkConst(SubobjType)) | ||||||
3348 | return false; | ||||||
3349 | if (!NewVal.isInt()) { | ||||||
3350 | // Maybe trying to write a cast pointer value into a complex? | ||||||
3351 | Info.FFDiag(E); | ||||||
3352 | return false; | ||||||
3353 | } | ||||||
3354 | Value = NewVal.getInt(); | ||||||
3355 | return true; | ||||||
3356 | } | ||||||
3357 | bool found(APFloat &Value, QualType SubobjType) { | ||||||
3358 | if (!checkConst(SubobjType)) | ||||||
3359 | return false; | ||||||
3360 | Value = NewVal.getFloat(); | ||||||
3361 | return true; | ||||||
3362 | } | ||||||
3363 | }; | ||||||
3364 | } // end anonymous namespace | ||||||
3365 | |||||||
3366 | const AccessKinds ModifySubobjectHandler::AccessKind; | ||||||
3367 | |||||||
3368 | /// Update the designated sub-object of an rvalue to the given value. | ||||||
3369 | static bool modifySubobject(EvalInfo &Info, const Expr *E, | ||||||
3370 | const CompleteObject &Obj, | ||||||
3371 | const SubobjectDesignator &Sub, | ||||||
3372 | APValue &NewVal) { | ||||||
3373 | ModifySubobjectHandler Handler = { Info, NewVal, E }; | ||||||
3374 | return findSubobject(Info, E, Obj, Sub, Handler); | ||||||
3375 | } | ||||||
3376 | |||||||
3377 | /// Find the position where two subobject designators diverge, or equivalently | ||||||
3378 | /// the length of the common initial subsequence. | ||||||
3379 | static unsigned FindDesignatorMismatch(QualType ObjType, | ||||||
3380 | const SubobjectDesignator &A, | ||||||
3381 | const SubobjectDesignator &B, | ||||||
3382 | bool &WasArrayIndex) { | ||||||
3383 | unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); | ||||||
3384 | for (/**/; I != N; ++I) { | ||||||
3385 | if (!ObjType.isNull() && | ||||||
3386 | (ObjType->isArrayType() || ObjType->isAnyComplexType())) { | ||||||
3387 | // Next subobject is an array element. | ||||||
3388 | if (A.Entries[I].getAsArrayIndex() != B.Entries[I].getAsArrayIndex()) { | ||||||
3389 | WasArrayIndex = true; | ||||||
3390 | return I; | ||||||
3391 | } | ||||||
3392 | if (ObjType->isAnyComplexType()) | ||||||
3393 | ObjType = ObjType->castAs<ComplexType>()->getElementType(); | ||||||
3394 | else | ||||||
3395 | ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); | ||||||
3396 | } else { | ||||||
3397 | if (A.Entries[I].getAsBaseOrMember() != | ||||||
3398 | B.Entries[I].getAsBaseOrMember()) { | ||||||
3399 | WasArrayIndex = false; | ||||||
3400 | return I; | ||||||
3401 | } | ||||||
3402 | if (const FieldDecl *FD = getAsField(A.Entries[I])) | ||||||
3403 | // Next subobject is a field. | ||||||
3404 | ObjType = FD->getType(); | ||||||
3405 | else | ||||||
3406 | // Next subobject is a base class. | ||||||
3407 | ObjType = QualType(); | ||||||
3408 | } | ||||||
3409 | } | ||||||
3410 | WasArrayIndex = false; | ||||||
3411 | return I; | ||||||
3412 | } | ||||||
3413 | |||||||
3414 | /// Determine whether the given subobject designators refer to elements of the | ||||||
3415 | /// same array object. | ||||||
3416 | static bool AreElementsOfSameArray(QualType ObjType, | ||||||
3417 | const SubobjectDesignator &A, | ||||||
3418 | const SubobjectDesignator &B) { | ||||||
3419 | if (A.Entries.size() != B.Entries.size()) | ||||||
3420 | return false; | ||||||
3421 | |||||||
3422 | bool IsArray = A.MostDerivedIsArrayElement; | ||||||
3423 | if (IsArray && A.MostDerivedPathLength != A.Entries.size()) | ||||||
3424 | // A is a subobject of the array element. | ||||||
3425 | return false; | ||||||
3426 | |||||||
3427 | // If A (and B) designates an array element, the last entry will be the array | ||||||
3428 | // index. That doesn't have to match. Otherwise, we're in the 'implicit array | ||||||
3429 | // of length 1' case, and the entire path must match. | ||||||
3430 | bool WasArrayIndex; | ||||||
3431 | unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); | ||||||
3432 | return CommonLength >= A.Entries.size() - IsArray; | ||||||
3433 | } | ||||||
3434 | |||||||
3435 | /// Find the complete object to which an LValue refers. | ||||||
3436 | static CompleteObject findCompleteObject(EvalInfo &Info, const Expr *E, | ||||||
3437 | AccessKinds AK, const LValue &LVal, | ||||||
3438 | QualType LValType) { | ||||||
3439 | if (LVal.InvalidBase) { | ||||||
3440 | Info.FFDiag(E); | ||||||
3441 | return CompleteObject(); | ||||||
3442 | } | ||||||
3443 | |||||||
3444 | if (!LVal.Base) { | ||||||
3445 | Info.FFDiag(E, diag::note_constexpr_access_null) << AK; | ||||||
3446 | return CompleteObject(); | ||||||
3447 | } | ||||||
3448 | |||||||
3449 | CallStackFrame *Frame = nullptr; | ||||||
3450 | unsigned Depth = 0; | ||||||
3451 | if (LVal.getLValueCallIndex()) { | ||||||
3452 | std::tie(Frame, Depth) = | ||||||
3453 | Info.getCallFrameAndDepth(LVal.getLValueCallIndex()); | ||||||
3454 | if (!Frame) { | ||||||
3455 | Info.FFDiag(E, diag::note_constexpr_lifetime_ended, 1) | ||||||
3456 | << AK << LVal.Base.is<const ValueDecl*>(); | ||||||
3457 | NoteLValueLocation(Info, LVal.Base); | ||||||
3458 | return CompleteObject(); | ||||||
3459 | } | ||||||
3460 | } | ||||||
3461 | |||||||
3462 | bool IsAccess = isAnyAccess(AK); | ||||||
3463 | |||||||
3464 | // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type | ||||||
3465 | // is not a constant expression (even if the object is non-volatile). We also | ||||||
3466 | // apply this rule to C++98, in order to conform to the expected 'volatile' | ||||||
3467 | // semantics. | ||||||
3468 | if (isFormalAccess(AK) && LValType.isVolatileQualified()) { | ||||||
3469 | if (Info.getLangOpts().CPlusPlus) | ||||||
3470 | Info.FFDiag(E, diag::note_constexpr_access_volatile_type) | ||||||
3471 | << AK << LValType; | ||||||
3472 | else | ||||||
3473 | Info.FFDiag(E); | ||||||
3474 | return CompleteObject(); | ||||||
3475 | } | ||||||
3476 | |||||||
3477 | // Compute value storage location and type of base object. | ||||||
3478 | APValue *BaseVal = nullptr; | ||||||
3479 | QualType BaseType = getType(LVal.Base); | ||||||
3480 | |||||||
3481 | if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl*>()) { | ||||||
3482 | // In C++98, const, non-volatile integers initialized with ICEs are ICEs. | ||||||
3483 | // In C++11, constexpr, non-volatile variables initialized with constant | ||||||
3484 | // expressions are constant expressions too. Inside constexpr functions, | ||||||
3485 | // parameters are constant expressions even if they're non-const. | ||||||
3486 | // In C++1y, objects local to a constant expression (those with a Frame) are | ||||||
3487 | // both readable and writable inside constant expressions. | ||||||
3488 | // In C, such things can also be folded, although they are not ICEs. | ||||||
3489 | const VarDecl *VD = dyn_cast<VarDecl>(D); | ||||||
3490 | if (VD) { | ||||||
3491 | if (const VarDecl *VDef = VD->getDefinition(Info.Ctx)) | ||||||
3492 | VD = VDef; | ||||||
3493 | } | ||||||
3494 | if (!VD || VD->isInvalidDecl()) { | ||||||
3495 | Info.FFDiag(E); | ||||||
3496 | return CompleteObject(); | ||||||
3497 | } | ||||||
3498 | |||||||
3499 | // Unless we're looking at a local variable or argument in a constexpr call, | ||||||
3500 | // the variable we're reading must be const. | ||||||
3501 | if (!Frame) { | ||||||
3502 | if (Info.getLangOpts().CPlusPlus14 && | ||||||
3503 | lifetimeStartedInEvaluation(Info, LVal.Base)) { | ||||||
3504 | // OK, we can read and modify an object if we're in the process of | ||||||
3505 | // evaluating its initializer, because its lifetime began in this | ||||||
3506 | // evaluation. | ||||||
3507 | } else if (isModification(AK)) { | ||||||
3508 | // All the remaining cases do not permit modification of the object. | ||||||
3509 | Info.FFDiag(E, diag::note_constexpr_modify_global); | ||||||
3510 | return CompleteObject(); | ||||||
3511 | } else if (VD->isConstexpr()) { | ||||||
3512 | // OK, we can read this variable. | ||||||
3513 | } else if (BaseType->isIntegralOrEnumerationType()) { | ||||||
3514 | // In OpenCL if a variable is in constant address space it is a const | ||||||
3515 | // value. | ||||||
3516 | if (!(BaseType.isConstQualified() || | ||||||
3517 | (Info.getLangOpts().OpenCL && | ||||||
3518 | BaseType.getAddressSpace() == LangAS::opencl_constant))) { | ||||||
3519 | if (!IsAccess) | ||||||
3520 | return CompleteObject(LVal.getLValueBase(), nullptr, BaseType); | ||||||
3521 | if (Info.getLangOpts().CPlusPlus) { | ||||||
3522 | Info.FFDiag(E, diag::note_constexpr_ltor_non_const_int, 1) << VD; | ||||||
3523 | Info.Note(VD->getLocation(), diag::note_declared_at); | ||||||
3524 | } else { | ||||||
3525 | Info.FFDiag(E); | ||||||
3526 | } | ||||||
3527 | return CompleteObject(); | ||||||
3528 | } | ||||||
3529 | } else if (!IsAccess) { | ||||||
3530 | return CompleteObject(LVal.getLValueBase(), nullptr, BaseType); | ||||||
3531 | } else if (BaseType->isFloatingType() && BaseType.isConstQualified()) { | ||||||
3532 | // We support folding of const floating-point types, in order to make | ||||||
3533 | // static const data members of such types (supported as an extension) | ||||||
3534 | // more useful. | ||||||
3535 | if (Info.getLangOpts().CPlusPlus11) { | ||||||
3536 | Info.CCEDiag(E, diag::note_constexpr_ltor_non_constexpr, 1) << VD; | ||||||
3537 | Info.Note(VD->getLocation(), diag::note_declared_at); | ||||||
3538 | } else { | ||||||
3539 | Info.CCEDiag(E); | ||||||
3540 | } | ||||||
3541 | } else if (BaseType.isConstQualified() && VD->hasDefinition(Info.Ctx)) { | ||||||
3542 | Info.CCEDiag(E, diag::note_constexpr_ltor_non_constexpr) << VD; | ||||||
3543 | // Keep evaluating to see what we can do. | ||||||
3544 | } else { | ||||||
3545 | // FIXME: Allow folding of values of any literal type in all languages. | ||||||
3546 | if (Info.checkingPotentialConstantExpression() && | ||||||
3547 | VD->getType().isConstQualified() && !VD->hasDefinition(Info.Ctx)) { | ||||||
3548 | // The definition of this variable could be constexpr. We can't | ||||||
3549 | // access it right now, but may be able to in future. | ||||||
3550 | } else if (Info.getLangOpts().CPlusPlus11) { | ||||||
3551 | Info.FFDiag(E, diag::note_constexpr_ltor_non_constexpr, 1) << VD; | ||||||
3552 | Info.Note(VD->getLocation(), diag::note_declared_at); | ||||||
3553 | } else { | ||||||
3554 | Info.FFDiag(E); | ||||||
3555 | } | ||||||
3556 | return CompleteObject(); | ||||||
3557 | } | ||||||
3558 | } | ||||||
3559 | |||||||
3560 | if (!evaluateVarDeclInit(Info, E, VD, Frame, BaseVal, &LVal)) | ||||||
3561 | return CompleteObject(); | ||||||
3562 | } else if (DynamicAllocLValue DA = LVal.Base.dyn_cast<DynamicAllocLValue>()) { | ||||||
3563 | Optional<EvalInfo::DynAlloc*> Alloc = Info.lookupDynamicAlloc(DA); | ||||||
3564 | if (!Alloc) { | ||||||
3565 | Info.FFDiag(E, diag::note_constexpr_access_deleted_object) << AK; | ||||||
3566 | return CompleteObject(); | ||||||
3567 | } | ||||||
3568 | return CompleteObject(LVal.Base, &(*Alloc)->Value, | ||||||
3569 | LVal.Base.getDynamicAllocType()); | ||||||
3570 | } else { | ||||||
3571 | const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); | ||||||
3572 | |||||||
3573 | if (!Frame) { | ||||||
3574 | if (const MaterializeTemporaryExpr *MTE = | ||||||
3575 | dyn_cast_or_null<MaterializeTemporaryExpr>(Base)) { | ||||||
3576 | assert(MTE->getStorageDuration() == SD_Static &&((MTE->getStorageDuration() == SD_Static && "should have a frame for a non-global materialized temporary" ) ? static_cast<void> (0) : __assert_fail ("MTE->getStorageDuration() == SD_Static && \"should have a frame for a non-global materialized temporary\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3577, __PRETTY_FUNCTION__)) | ||||||
3577 | "should have a frame for a non-global materialized temporary")((MTE->getStorageDuration() == SD_Static && "should have a frame for a non-global materialized temporary" ) ? static_cast<void> (0) : __assert_fail ("MTE->getStorageDuration() == SD_Static && \"should have a frame for a non-global materialized temporary\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3577, __PRETTY_FUNCTION__)); | ||||||
3578 | |||||||
3579 | // Per C++1y [expr.const]p2: | ||||||
3580 | // an lvalue-to-rvalue conversion [is not allowed unless it applies to] | ||||||
3581 | // - a [...] glvalue of integral or enumeration type that refers to | ||||||
3582 | // a non-volatile const object [...] | ||||||
3583 | // [...] | ||||||
3584 | // - a [...] glvalue of literal type that refers to a non-volatile | ||||||
3585 | // object whose lifetime began within the evaluation of e. | ||||||
3586 | // | ||||||
3587 | // C++11 misses the 'began within the evaluation of e' check and | ||||||
3588 | // instead allows all temporaries, including things like: | ||||||
3589 | // int &&r = 1; | ||||||
3590 | // int x = ++r; | ||||||
3591 | // constexpr int k = r; | ||||||
3592 | // Therefore we use the C++14 rules in C++11 too. | ||||||
3593 | // | ||||||
3594 | // Note that temporaries whose lifetimes began while evaluating a | ||||||
3595 | // variable's constructor are not usable while evaluating the | ||||||
3596 | // corresponding destructor, not even if they're of const-qualified | ||||||
3597 | // types. | ||||||
3598 | if (!(BaseType.isConstQualified() && | ||||||
3599 | BaseType->isIntegralOrEnumerationType()) && | ||||||
3600 | !lifetimeStartedInEvaluation(Info, LVal.Base)) { | ||||||
3601 | if (!IsAccess) | ||||||
3602 | return CompleteObject(LVal.getLValueBase(), nullptr, BaseType); | ||||||
3603 | Info.FFDiag(E, diag::note_constexpr_access_static_temporary, 1) << AK; | ||||||
3604 | Info.Note(MTE->getExprLoc(), diag::note_constexpr_temporary_here); | ||||||
3605 | return CompleteObject(); | ||||||
3606 | } | ||||||
3607 | |||||||
3608 | BaseVal = Info.Ctx.getMaterializedTemporaryValue(MTE, false); | ||||||
3609 | assert(BaseVal && "got reference to unevaluated temporary")((BaseVal && "got reference to unevaluated temporary" ) ? static_cast<void> (0) : __assert_fail ("BaseVal && \"got reference to unevaluated temporary\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3609, __PRETTY_FUNCTION__)); | ||||||
3610 | } else { | ||||||
3611 | if (!IsAccess) | ||||||
3612 | return CompleteObject(LVal.getLValueBase(), nullptr, BaseType); | ||||||
3613 | APValue Val; | ||||||
3614 | LVal.moveInto(Val); | ||||||
3615 | Info.FFDiag(E, diag::note_constexpr_access_unreadable_object) | ||||||
3616 | << AK | ||||||
3617 | << Val.getAsString(Info.Ctx, | ||||||
3618 | Info.Ctx.getLValueReferenceType(LValType)); | ||||||
3619 | NoteLValueLocation(Info, LVal.Base); | ||||||
3620 | return CompleteObject(); | ||||||
3621 | } | ||||||
3622 | } else { | ||||||
3623 | BaseVal = Frame->getTemporary(Base, LVal.Base.getVersion()); | ||||||
3624 | assert(BaseVal && "missing value for temporary")((BaseVal && "missing value for temporary") ? static_cast <void> (0) : __assert_fail ("BaseVal && \"missing value for temporary\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3624, __PRETTY_FUNCTION__)); | ||||||
3625 | } | ||||||
3626 | } | ||||||
3627 | |||||||
3628 | // In C++14, we can't safely access any mutable state when we might be | ||||||
3629 | // evaluating after an unmodeled side effect. | ||||||
3630 | // | ||||||
3631 | // FIXME: Not all local state is mutable. Allow local constant subobjects | ||||||
3632 | // to be read here (but take care with 'mutable' fields). | ||||||
3633 | if ((Frame && Info.getLangOpts().CPlusPlus14 && | ||||||
3634 | Info.EvalStatus.HasSideEffects) || | ||||||
3635 | (isModification(AK) && Depth < Info.SpeculativeEvaluationDepth)) | ||||||
3636 | return CompleteObject(); | ||||||
3637 | |||||||
3638 | return CompleteObject(LVal.getLValueBase(), BaseVal, BaseType); | ||||||
3639 | } | ||||||
3640 | |||||||
3641 | /// Perform an lvalue-to-rvalue conversion on the given glvalue. This | ||||||
3642 | /// can also be used for 'lvalue-to-lvalue' conversions for looking up the | ||||||
3643 | /// glvalue referred to by an entity of reference type. | ||||||
3644 | /// | ||||||
3645 | /// \param Info - Information about the ongoing evaluation. | ||||||
3646 | /// \param Conv - The expression for which we are performing the conversion. | ||||||
3647 | /// Used for diagnostics. | ||||||
3648 | /// \param Type - The type of the glvalue (before stripping cv-qualifiers in the | ||||||
3649 | /// case of a non-class type). | ||||||
3650 | /// \param LVal - The glvalue on which we are attempting to perform this action. | ||||||
3651 | /// \param RVal - The produced value will be placed here. | ||||||
3652 | /// \param WantObjectRepresentation - If true, we're looking for the object | ||||||
3653 | /// representation rather than the value, and in particular, | ||||||
3654 | /// there is no requirement that the result be fully initialized. | ||||||
3655 | static bool | ||||||
3656 | handleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, QualType Type, | ||||||
3657 | const LValue &LVal, APValue &RVal, | ||||||
3658 | bool WantObjectRepresentation = false) { | ||||||
3659 | if (LVal.Designator.Invalid) | ||||||
3660 | return false; | ||||||
3661 | |||||||
3662 | // Check for special cases where there is no existing APValue to look at. | ||||||
3663 | const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); | ||||||
3664 | |||||||
3665 | AccessKinds AK = | ||||||
3666 | WantObjectRepresentation ? AK_ReadObjectRepresentation : AK_Read; | ||||||
3667 | |||||||
3668 | if (Base && !LVal.getLValueCallIndex() && !Type.isVolatileQualified()) { | ||||||
3669 | if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(Base)) { | ||||||
3670 | // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the | ||||||
3671 | // initializer until now for such expressions. Such an expression can't be | ||||||
3672 | // an ICE in C, so this only matters for fold. | ||||||
3673 | if (Type.isVolatileQualified()) { | ||||||
3674 | Info.FFDiag(Conv); | ||||||
3675 | return false; | ||||||
3676 | } | ||||||
3677 | APValue Lit; | ||||||
3678 | if (!Evaluate(Lit, Info, CLE->getInitializer())) | ||||||
3679 | return false; | ||||||
3680 | CompleteObject LitObj(LVal.Base, &Lit, Base->getType()); | ||||||
3681 | return extractSubobject(Info, Conv, LitObj, LVal.Designator, RVal, AK); | ||||||
3682 | } else if (isa<StringLiteral>(Base) || isa<PredefinedExpr>(Base)) { | ||||||
3683 | // Special-case character extraction so we don't have to construct an | ||||||
3684 | // APValue for the whole string. | ||||||
3685 | assert(LVal.Designator.Entries.size() <= 1 &&((LVal.Designator.Entries.size() <= 1 && "Can only read characters from string literals" ) ? static_cast<void> (0) : __assert_fail ("LVal.Designator.Entries.size() <= 1 && \"Can only read characters from string literals\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3686, __PRETTY_FUNCTION__)) | ||||||
3686 | "Can only read characters from string literals")((LVal.Designator.Entries.size() <= 1 && "Can only read characters from string literals" ) ? static_cast<void> (0) : __assert_fail ("LVal.Designator.Entries.size() <= 1 && \"Can only read characters from string literals\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 3686, __PRETTY_FUNCTION__)); | ||||||
3687 | if (LVal.Designator.Entries.empty()) { | ||||||
3688 | // Fail for now for LValue to RValue conversion of an array. | ||||||
3689 | // (This shouldn't show up in C/C++, but it could be triggered by a | ||||||
3690 | // weird EvaluateAsRValue call from a tool.) | ||||||
3691 | Info.FFDiag(Conv); | ||||||
3692 | return false; | ||||||
3693 | } | ||||||
3694 | if (LVal.Designator.isOnePastTheEnd()) { | ||||||
3695 | if (Info.getLangOpts().CPlusPlus11) | ||||||
3696 | Info.FFDiag(Conv, diag::note_constexpr_access_past_end) << AK; | ||||||
3697 | else | ||||||
3698 | Info.FFDiag(Conv); | ||||||
3699 | return false; | ||||||
3700 | } | ||||||
3701 | uint64_t CharIndex = LVal.Designator.Entries[0].getAsArrayIndex(); | ||||||
3702 | RVal = APValue(extractStringLiteralCharacter(Info, Base, CharIndex)); | ||||||
3703 | return true; | ||||||
3704 | } | ||||||
3705 | } | ||||||
3706 | |||||||
3707 | CompleteObject Obj = findCompleteObject(Info, Conv, AK, LVal, Type); | ||||||
3708 | return Obj && extractSubobject(Info, Conv, Obj, LVal.Designator, RVal, AK); | ||||||
3709 | } | ||||||
3710 | |||||||
3711 | /// Perform an assignment of Val to LVal. Takes ownership of Val. | ||||||
3712 | static bool handleAssignment(EvalInfo &Info, const Expr *E, const LValue &LVal, | ||||||
3713 | QualType LValType, APValue &Val) { | ||||||
3714 | if (LVal.Designator.Invalid) | ||||||
3715 | return false; | ||||||
3716 | |||||||
3717 | if (!Info.getLangOpts().CPlusPlus14) { | ||||||
3718 | Info.FFDiag(E); | ||||||
3719 | return false; | ||||||
3720 | } | ||||||
3721 | |||||||
3722 | CompleteObject Obj = findCompleteObject(Info, E, AK_Assign, LVal, LValType); | ||||||
3723 | return Obj && modifySubobject(Info, E, Obj, LVal.Designator, Val); | ||||||
3724 | } | ||||||
3725 | |||||||
3726 | namespace { | ||||||
3727 | struct CompoundAssignSubobjectHandler { | ||||||
3728 | EvalInfo &Info; | ||||||
3729 | const Expr *E; | ||||||
3730 | QualType PromotedLHSType; | ||||||
3731 | BinaryOperatorKind Opcode; | ||||||
3732 | const APValue &RHS; | ||||||
3733 | |||||||
3734 | static const AccessKinds AccessKind = AK_Assign; | ||||||
3735 | |||||||
3736 | typedef bool result_type; | ||||||
3737 | |||||||
3738 | bool checkConst(QualType QT) { | ||||||
3739 | // Assigning to a const object has undefined behavior. | ||||||
3740 | if (QT.isConstQualified()) { | ||||||
3741 | Info.FFDiag(E, diag::note_constexpr_modify_const_type) << QT; | ||||||
3742 | return false; | ||||||
3743 | } | ||||||
3744 | return true; | ||||||
3745 | } | ||||||
3746 | |||||||
3747 | bool failed() { return false; } | ||||||
3748 | bool found(APValue &Subobj, QualType SubobjType) { | ||||||
3749 | switch (Subobj.getKind()) { | ||||||
3750 | case APValue::Int: | ||||||
3751 | return found(Subobj.getInt(), SubobjType); | ||||||
3752 | case APValue::Float: | ||||||
3753 | return found(Subobj.getFloat(), SubobjType); | ||||||
3754 | case APValue::ComplexInt: | ||||||
3755 | case APValue::ComplexFloat: | ||||||
3756 | // FIXME: Implement complex compound assignment. | ||||||
3757 | Info.FFDiag(E); | ||||||
3758 | return false; | ||||||
3759 | case APValue::LValue: | ||||||
3760 | return foundPointer(Subobj, SubobjType); | ||||||
3761 | default: | ||||||
3762 | // FIXME: can this happen? | ||||||
3763 | Info.FFDiag(E); | ||||||
3764 | return false; | ||||||
3765 | } | ||||||
3766 | } | ||||||
3767 | bool found(APSInt &Value, QualType SubobjType) { | ||||||
3768 | if (!checkConst(SubobjType)) | ||||||
3769 | return false; | ||||||
3770 | |||||||
3771 | if (!SubobjType->isIntegerType()) { | ||||||
3772 | // We don't support compound assignment on integer-cast-to-pointer | ||||||
3773 | // values. | ||||||
3774 | Info.FFDiag(E); | ||||||
3775 | return false; | ||||||
3776 | } | ||||||
3777 | |||||||
3778 | if (RHS.isInt()) { | ||||||
3779 | APSInt LHS = | ||||||
3780 | HandleIntToIntCast(Info, E, PromotedLHSType, SubobjType, Value); | ||||||
3781 | if (!handleIntIntBinOp(Info, E, LHS, Opcode, RHS.getInt(), LHS)) | ||||||
3782 | return false; | ||||||
3783 | Value = HandleIntToIntCast(Info, E, SubobjType, PromotedLHSType, LHS); | ||||||
3784 | return true; | ||||||
3785 | } else if (RHS.isFloat()) { | ||||||
3786 | APFloat FValue(0.0); | ||||||
3787 | return HandleIntToFloatCast(Info, E, SubobjType, Value, PromotedLHSType, | ||||||
3788 | FValue) && | ||||||
3789 | handleFloatFloatBinOp(Info, E, FValue, Opcode, RHS.getFloat()) && | ||||||
3790 | HandleFloatToIntCast(Info, E, PromotedLHSType, FValue, SubobjType, | ||||||
3791 | Value); | ||||||
3792 | } | ||||||
3793 | |||||||
3794 | Info.FFDiag(E); | ||||||
3795 | return false; | ||||||
3796 | } | ||||||
3797 | bool found(APFloat &Value, QualType SubobjType) { | ||||||
3798 | return checkConst(SubobjType) && | ||||||
3799 | HandleFloatToFloatCast(Info, E, SubobjType, PromotedLHSType, | ||||||
3800 | Value) && | ||||||
3801 | handleFloatFloatBinOp(Info, E, Value, Opcode, RHS.getFloat()) && | ||||||
3802 | HandleFloatToFloatCast(Info, E, PromotedLHSType, SubobjType, Value); | ||||||
3803 | } | ||||||
3804 | bool foundPointer(APValue &Subobj, QualType SubobjType) { | ||||||
3805 | if (!checkConst(SubobjType)) | ||||||
3806 | return false; | ||||||
3807 | |||||||
3808 | QualType PointeeType; | ||||||
3809 | if (const PointerType *PT = SubobjType->getAs<PointerType>()) | ||||||
3810 | PointeeType = PT->getPointeeType(); | ||||||
3811 | |||||||
3812 | if (PointeeType.isNull() || !RHS.isInt() || | ||||||
3813 | (Opcode != BO_Add && Opcode != BO_Sub)) { | ||||||
3814 | Info.FFDiag(E); | ||||||
3815 | return false; | ||||||
3816 | } | ||||||
3817 | |||||||
3818 | APSInt Offset = RHS.getInt(); | ||||||
3819 | if (Opcode == BO_Sub) | ||||||
3820 | negateAsSigned(Offset); | ||||||
3821 | |||||||
3822 | LValue LVal; | ||||||
3823 | LVal.setFrom(Info.Ctx, Subobj); | ||||||
3824 | if (!HandleLValueArrayAdjustment(Info, E, LVal, PointeeType, Offset)) | ||||||
3825 | return false; | ||||||
3826 | LVal.moveInto(Subobj); | ||||||
3827 | return true; | ||||||
3828 | } | ||||||
3829 | }; | ||||||
3830 | } // end anonymous namespace | ||||||
3831 | |||||||
3832 | const AccessKinds CompoundAssignSubobjectHandler::AccessKind; | ||||||
3833 | |||||||
3834 | /// Perform a compound assignment of LVal <op>= RVal. | ||||||
3835 | static bool handleCompoundAssignment( | ||||||
3836 | EvalInfo &Info, const Expr *E, | ||||||
3837 | const LValue &LVal, QualType LValType, QualType PromotedLValType, | ||||||
3838 | BinaryOperatorKind Opcode, const APValue &RVal) { | ||||||
3839 | if (LVal.Designator.Invalid) | ||||||
3840 | return false; | ||||||
3841 | |||||||
3842 | if (!Info.getLangOpts().CPlusPlus14) { | ||||||
3843 | Info.FFDiag(E); | ||||||
3844 | return false; | ||||||
3845 | } | ||||||
3846 | |||||||
3847 | CompleteObject Obj = findCompleteObject(Info, E, AK_Assign, LVal, LValType); | ||||||
3848 | CompoundAssignSubobjectHandler Handler = { Info, E, PromotedLValType, Opcode, | ||||||
3849 | RVal }; | ||||||
3850 | return Obj && findSubobject(Info, E, Obj, LVal.Designator, Handler); | ||||||
3851 | } | ||||||
3852 | |||||||
3853 | namespace { | ||||||
3854 | struct IncDecSubobjectHandler { | ||||||
3855 | EvalInfo &Info; | ||||||
3856 | const UnaryOperator *E; | ||||||
3857 | AccessKinds AccessKind; | ||||||
3858 | APValue *Old; | ||||||
3859 | |||||||
3860 | typedef bool result_type; | ||||||
3861 | |||||||
3862 | bool checkConst(QualType QT) { | ||||||
3863 | // Assigning to a const object has undefined behavior. | ||||||
3864 | if (QT.isConstQualified()) { | ||||||
3865 | Info.FFDiag(E, diag::note_constexpr_modify_const_type) << QT; | ||||||
3866 | return false; | ||||||
3867 | } | ||||||
3868 | return true; | ||||||
3869 | } | ||||||
3870 | |||||||
3871 | bool failed() { return false; } | ||||||
3872 | bool found(APValue &Subobj, QualType SubobjType) { | ||||||
3873 | // Stash the old value. Also clear Old, so we don't clobber it later | ||||||
3874 | // if we're post-incrementing a complex. | ||||||
3875 | if (Old) { | ||||||
3876 | *Old = Subobj; | ||||||
3877 | Old = nullptr; | ||||||
3878 | } | ||||||
3879 | |||||||
3880 | switch (Subobj.getKind()) { | ||||||
3881 | case APValue::Int: | ||||||
3882 | return found(Subobj.getInt(), SubobjType); | ||||||
3883 | case APValue::Float: | ||||||
3884 | return found(Subobj.getFloat(), SubobjType); | ||||||
3885 | case APValue::ComplexInt: | ||||||
3886 | return found(Subobj.getComplexIntReal(), | ||||||
3887 | SubobjType->castAs<ComplexType>()->getElementType() | ||||||
3888 | .withCVRQualifiers(SubobjType.getCVRQualifiers())); | ||||||
3889 | case APValue::ComplexFloat: | ||||||
3890 | return found(Subobj.getComplexFloatReal(), | ||||||
3891 | SubobjType->castAs<ComplexType>()->getElementType() | ||||||
3892 | .withCVRQualifiers(SubobjType.getCVRQualifiers())); | ||||||
3893 | case APValue::LValue: | ||||||
3894 | return foundPointer(Subobj, SubobjType); | ||||||
3895 | default: | ||||||
3896 | // FIXME: can this happen? | ||||||
3897 | Info.FFDiag(E); | ||||||
3898 | return false; | ||||||
3899 | } | ||||||
3900 | } | ||||||
3901 | bool found(APSInt &Value, QualType SubobjType) { | ||||||
3902 | if (!checkConst(SubobjType)) | ||||||
3903 | return false; | ||||||
3904 | |||||||
3905 | if (!SubobjType->isIntegerType()) { | ||||||
3906 | // We don't support increment / decrement on integer-cast-to-pointer | ||||||
3907 | // values. | ||||||
3908 | Info.FFDiag(E); | ||||||
3909 | return false; | ||||||
3910 | } | ||||||
3911 | |||||||
3912 | if (Old) *Old = APValue(Value); | ||||||
3913 | |||||||
3914 | // bool arithmetic promotes to int, and the conversion back to bool | ||||||
3915 | // doesn't reduce mod 2^n, so special-case it. | ||||||
3916 | if (SubobjType->isBooleanType()) { | ||||||
3917 | if (AccessKind == AK_Increment) | ||||||
3918 | Value = 1; | ||||||
3919 | else | ||||||
3920 | Value = !Value; | ||||||
3921 | return true; | ||||||
3922 | } | ||||||
3923 | |||||||
3924 | bool WasNegative = Value.isNegative(); | ||||||
3925 | if (AccessKind == AK_Increment) { | ||||||
3926 | ++Value; | ||||||
3927 | |||||||
3928 | if (!WasNegative && Value.isNegative() && E->canOverflow()) { | ||||||
3929 | APSInt ActualValue(Value, /*IsUnsigned*/true); | ||||||
3930 | return HandleOverflow(Info, E, ActualValue, SubobjType); | ||||||
3931 | } | ||||||
3932 | } else { | ||||||
3933 | --Value; | ||||||
3934 | |||||||
3935 | if (WasNegative && !Value.isNegative() && E->canOverflow()) { | ||||||
3936 | unsigned BitWidth = Value.getBitWidth(); | ||||||
3937 | APSInt ActualValue(Value.sext(BitWidth + 1), /*IsUnsigned*/false); | ||||||
3938 | ActualValue.setBit(BitWidth); | ||||||
3939 | return HandleOverflow(Info, E, ActualValue, SubobjType); | ||||||
3940 | } | ||||||
3941 | } | ||||||
3942 | return true; | ||||||
3943 | } | ||||||
3944 | bool found(APFloat &Value, QualType SubobjType) { | ||||||
3945 | if (!checkConst(SubobjType)) | ||||||
3946 | return false; | ||||||
3947 | |||||||
3948 | if (Old) *Old = APValue(Value); | ||||||
3949 | |||||||
3950 | APFloat One(Value.getSemantics(), 1); | ||||||
3951 | if (AccessKind == AK_Increment) | ||||||
3952 | Value.add(One, APFloat::rmNearestTiesToEven); | ||||||
3953 | else | ||||||
3954 | Value.subtract(One, APFloat::rmNearestTiesToEven); | ||||||
3955 | return true; | ||||||
3956 | } | ||||||
3957 | bool foundPointer(APValue &Subobj, QualType SubobjType) { | ||||||
3958 | if (!checkConst(SubobjType)) | ||||||
3959 | return false; | ||||||
3960 | |||||||
3961 | QualType PointeeType; | ||||||
3962 | if (const PointerType *PT = SubobjType->getAs<PointerType>()) | ||||||
3963 | PointeeType = PT->getPointeeType(); | ||||||
3964 | else { | ||||||
3965 | Info.FFDiag(E); | ||||||
3966 | return false; | ||||||
3967 | } | ||||||
3968 | |||||||
3969 | LValue LVal; | ||||||
3970 | LVal.setFrom(Info.Ctx, Subobj); | ||||||
3971 | if (!HandleLValueArrayAdjustment(Info, E, LVal, PointeeType, | ||||||
3972 | AccessKind == AK_Increment ? 1 : -1)) | ||||||
3973 | return false; | ||||||
3974 | LVal.moveInto(Subobj); | ||||||
3975 | return true; | ||||||
3976 | } | ||||||
3977 | }; | ||||||
3978 | } // end anonymous namespace | ||||||
3979 | |||||||
3980 | /// Perform an increment or decrement on LVal. | ||||||
3981 | static bool handleIncDec(EvalInfo &Info, const Expr *E, const LValue &LVal, | ||||||
3982 | QualType LValType, bool IsIncrement, APValue *Old) { | ||||||
3983 | if (LVal.Designator.Invalid) | ||||||
3984 | return false; | ||||||
3985 | |||||||
3986 | if (!Info.getLangOpts().CPlusPlus14) { | ||||||
3987 | Info.FFDiag(E); | ||||||
3988 | return false; | ||||||
3989 | } | ||||||
3990 | |||||||
3991 | AccessKinds AK = IsIncrement ? AK_Increment : AK_Decrement; | ||||||
3992 | CompleteObject Obj = findCompleteObject(Info, E, AK, LVal, LValType); | ||||||
3993 | IncDecSubobjectHandler Handler = {Info, cast<UnaryOperator>(E), AK, Old}; | ||||||
3994 | return Obj && findSubobject(Info, E, Obj, LVal.Designator, Handler); | ||||||
3995 | } | ||||||
3996 | |||||||
3997 | /// Build an lvalue for the object argument of a member function call. | ||||||
3998 | static bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, | ||||||
3999 | LValue &This) { | ||||||
4000 | if (Object->getType()->isPointerType()) | ||||||
4001 | return EvaluatePointer(Object, This, Info); | ||||||
4002 | |||||||
4003 | if (Object->isGLValue()) | ||||||
4004 | return EvaluateLValue(Object, This, Info); | ||||||
4005 | |||||||
4006 | if (Object->getType()->isLiteralType(Info.Ctx)) | ||||||
4007 | return EvaluateTemporary(Object, This, Info); | ||||||
4008 | |||||||
4009 | Info.FFDiag(Object, diag::note_constexpr_nonliteral) << Object->getType(); | ||||||
4010 | return false; | ||||||
4011 | } | ||||||
4012 | |||||||
4013 | /// HandleMemberPointerAccess - Evaluate a member access operation and build an | ||||||
4014 | /// lvalue referring to the result. | ||||||
4015 | /// | ||||||
4016 | /// \param Info - Information about the ongoing evaluation. | ||||||
4017 | /// \param LV - An lvalue referring to the base of the member pointer. | ||||||
4018 | /// \param RHS - The member pointer expression. | ||||||
4019 | /// \param IncludeMember - Specifies whether the member itself is included in | ||||||
4020 | /// the resulting LValue subobject designator. This is not possible when | ||||||
4021 | /// creating a bound member function. | ||||||
4022 | /// \return The field or method declaration to which the member pointer refers, | ||||||
4023 | /// or 0 if evaluation fails. | ||||||
4024 | static const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, | ||||||
4025 | QualType LVType, | ||||||
4026 | LValue &LV, | ||||||
4027 | const Expr *RHS, | ||||||
4028 | bool IncludeMember = true) { | ||||||
4029 | MemberPtr MemPtr; | ||||||
4030 | if (!EvaluateMemberPointer(RHS, MemPtr, Info)) | ||||||
4031 | return nullptr; | ||||||
4032 | |||||||
4033 | // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to | ||||||
4034 | // member value, the behavior is undefined. | ||||||
4035 | if (!MemPtr.getDecl()) { | ||||||
4036 | // FIXME: Specific diagnostic. | ||||||
4037 | Info.FFDiag(RHS); | ||||||
4038 | return nullptr; | ||||||
4039 | } | ||||||
4040 | |||||||
4041 | if (MemPtr.isDerivedMember()) { | ||||||
4042 | // This is a member of some derived class. Truncate LV appropriately. | ||||||
4043 | // The end of the derived-to-base path for the base object must match the | ||||||
4044 | // derived-to-base path for the member pointer. | ||||||
4045 | if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > | ||||||
4046 | LV.Designator.Entries.size()) { | ||||||
4047 | Info.FFDiag(RHS); | ||||||
4048 | return nullptr; | ||||||
4049 | } | ||||||
4050 | unsigned PathLengthToMember = | ||||||
4051 | LV.Designator.Entries.size() - MemPtr.Path.size(); | ||||||
4052 | for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { | ||||||
4053 | const CXXRecordDecl *LVDecl = getAsBaseClass( | ||||||
4054 | LV.Designator.Entries[PathLengthToMember + I]); | ||||||
4055 | const CXXRecordDecl *MPDecl = MemPtr.Path[I]; | ||||||
4056 | if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) { | ||||||
4057 | Info.FFDiag(RHS); | ||||||
4058 | return nullptr; | ||||||
4059 | } | ||||||
4060 | } | ||||||
4061 | |||||||
4062 | // Truncate the lvalue to the appropriate derived class. | ||||||
4063 | if (!CastToDerivedClass(Info, RHS, LV, MemPtr.getContainingRecord(), | ||||||
4064 | PathLengthToMember)) | ||||||
4065 | return nullptr; | ||||||
4066 | } else if (!MemPtr.Path.empty()) { | ||||||
4067 | // Extend the LValue path with the member pointer's path. | ||||||
4068 | LV.Designator.Entries.reserve(LV.Designator.Entries.size() + | ||||||
4069 | MemPtr.Path.size() + IncludeMember); | ||||||
4070 | |||||||
4071 | // Walk down to the appropriate base class. | ||||||
4072 | if (const PointerType *PT = LVType->getAs<PointerType>()) | ||||||
4073 | LVType = PT->getPointeeType(); | ||||||
4074 | const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); | ||||||
4075 | assert(RD && "member pointer access on non-class-type expression")((RD && "member pointer access on non-class-type expression" ) ? static_cast<void> (0) : __assert_fail ("RD && \"member pointer access on non-class-type expression\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 4075, __PRETTY_FUNCTION__)); | ||||||
4076 | // The first class in the path is that of the lvalue. | ||||||
4077 | for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { | ||||||
4078 | const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; | ||||||
4079 | if (!HandleLValueDirectBase(Info, RHS, LV, RD, Base)) | ||||||
4080 | return nullptr; | ||||||
4081 | RD = Base; | ||||||
4082 | } | ||||||
4083 | // Finally cast to the class containing the member. | ||||||
4084 | if (!HandleLValueDirectBase(Info, RHS, LV, RD, | ||||||
4085 | MemPtr.getContainingRecord())) | ||||||
4086 | return nullptr; | ||||||
4087 | } | ||||||
4088 | |||||||
4089 | // Add the member. Note that we cannot build bound member functions here. | ||||||
4090 | if (IncludeMember) { | ||||||
4091 | if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) { | ||||||
4092 | if (!HandleLValueMember(Info, RHS, LV, FD)) | ||||||
4093 | return nullptr; | ||||||
4094 | } else if (const IndirectFieldDecl *IFD = | ||||||
4095 | dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) { | ||||||
4096 | if (!HandleLValueIndirectMember(Info, RHS, LV, IFD)) | ||||||
4097 | return nullptr; | ||||||
4098 | } else { | ||||||
4099 | llvm_unreachable("can't construct reference to bound member function")::llvm::llvm_unreachable_internal("can't construct reference to bound member function" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 4099); | ||||||
4100 | } | ||||||
4101 | } | ||||||
4102 | |||||||
4103 | return MemPtr.getDecl(); | ||||||
4104 | } | ||||||
4105 | |||||||
4106 | static const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, | ||||||
4107 | const BinaryOperator *BO, | ||||||
4108 | LValue &LV, | ||||||
4109 | bool IncludeMember = true) { | ||||||
4110 | assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI)((BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI ) ? static_cast<void> (0) : __assert_fail ("BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 4110, __PRETTY_FUNCTION__)); | ||||||
4111 | |||||||
4112 | if (!EvaluateObjectArgument(Info, BO->getLHS(), LV)) { | ||||||
4113 | if (Info.noteFailure()) { | ||||||
4114 | MemberPtr MemPtr; | ||||||
4115 | EvaluateMemberPointer(BO->getRHS(), MemPtr, Info); | ||||||
4116 | } | ||||||
4117 | return nullptr; | ||||||
4118 | } | ||||||
4119 | |||||||
4120 | return HandleMemberPointerAccess(Info, BO->getLHS()->getType(), LV, | ||||||
4121 | BO->getRHS(), IncludeMember); | ||||||
4122 | } | ||||||
4123 | |||||||
4124 | /// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on | ||||||
4125 | /// the provided lvalue, which currently refers to the base object. | ||||||
4126 | static bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, | ||||||
4127 | LValue &Result) { | ||||||
4128 | SubobjectDesignator &D = Result.Designator; | ||||||
4129 | if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) | ||||||
4130 | return false; | ||||||
4131 | |||||||
4132 | QualType TargetQT = E->getType(); | ||||||
4133 | if (const PointerType *PT = TargetQT->getAs<PointerType>()) | ||||||
4134 | TargetQT = PT->getPointeeType(); | ||||||
4135 | |||||||
4136 | // Check this cast lands within the final derived-to-base subobject path. | ||||||
4137 | if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { | ||||||
4138 | Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) | ||||||
4139 | << D.MostDerivedType << TargetQT; | ||||||
4140 | return false; | ||||||
4141 | } | ||||||
4142 | |||||||
4143 | // Check the type of the final cast. We don't need to check the path, | ||||||
4144 | // since a cast can only be formed if the path is unique. | ||||||
4145 | unsigned NewEntriesSize = D.Entries.size() - E->path_size(); | ||||||
4146 | const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); | ||||||
4147 | const CXXRecordDecl *FinalType; | ||||||
4148 | if (NewEntriesSize == D.MostDerivedPathLength) | ||||||
4149 | FinalType = D.MostDerivedType->getAsCXXRecordDecl(); | ||||||
4150 | else | ||||||
4151 | FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); | ||||||
4152 | if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { | ||||||
4153 | Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) | ||||||
4154 | << D.MostDerivedType << TargetQT; | ||||||
4155 | return false; | ||||||
4156 | } | ||||||
4157 | |||||||
4158 | // Truncate the lvalue to the appropriate derived class. | ||||||
4159 | return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); | ||||||
4160 | } | ||||||
4161 | |||||||
4162 | /// Get the value to use for a default-initialized object of type T. | ||||||
4163 | static APValue getDefaultInitValue(QualType T) { | ||||||
4164 | if (auto *RD = T->getAsCXXRecordDecl()) { | ||||||
4165 | if (RD->isUnion()) | ||||||
4166 | return APValue((const FieldDecl*)nullptr); | ||||||
4167 | |||||||
4168 | APValue Struct(APValue::UninitStruct(), RD->getNumBases(), | ||||||
4169 | std::distance(RD->field_begin(), RD->field_end())); | ||||||
4170 | |||||||
4171 | unsigned Index = 0; | ||||||
4172 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), | ||||||
4173 | End = RD->bases_end(); I != End; ++I, ++Index) | ||||||
4174 | Struct.getStructBase(Index) = getDefaultInitValue(I->getType()); | ||||||
4175 | |||||||
4176 | for (const auto *I : RD->fields()) { | ||||||
4177 | if (I->isUnnamedBitfield()) | ||||||
4178 | continue; | ||||||
4179 | Struct.getStructField(I->getFieldIndex()) = | ||||||
4180 | getDefaultInitValue(I->getType()); | ||||||
4181 | } | ||||||
4182 | return Struct; | ||||||
4183 | } | ||||||
4184 | |||||||
4185 | if (auto *AT = | ||||||
4186 | dyn_cast_or_null<ConstantArrayType>(T->getAsArrayTypeUnsafe())) { | ||||||
4187 | APValue Array(APValue::UninitArray(), 0, AT->getSize().getZExtValue()); | ||||||
4188 | if (Array.hasArrayFiller()) | ||||||
4189 | Array.getArrayFiller() = getDefaultInitValue(AT->getElementType()); | ||||||
4190 | return Array; | ||||||
4191 | } | ||||||
4192 | |||||||
4193 | return APValue::IndeterminateValue(); | ||||||
4194 | } | ||||||
4195 | |||||||
4196 | namespace { | ||||||
4197 | enum EvalStmtResult { | ||||||
4198 | /// Evaluation failed. | ||||||
4199 | ESR_Failed, | ||||||
4200 | /// Hit a 'return' statement. | ||||||
4201 | ESR_Returned, | ||||||
4202 | /// Evaluation succeeded. | ||||||
4203 | ESR_Succeeded, | ||||||
4204 | /// Hit a 'continue' statement. | ||||||
4205 | ESR_Continue, | ||||||
4206 | /// Hit a 'break' statement. | ||||||
4207 | ESR_Break, | ||||||
4208 | /// Still scanning for 'case' or 'default' statement. | ||||||
4209 | ESR_CaseNotFound | ||||||
4210 | }; | ||||||
4211 | } | ||||||
4212 | |||||||
4213 | static bool EvaluateVarDecl(EvalInfo &Info, const VarDecl *VD) { | ||||||
4214 | // We don't need to evaluate the initializer for a static local. | ||||||
4215 | if (!VD->hasLocalStorage()) | ||||||
4216 | return true; | ||||||
4217 | |||||||
4218 | LValue Result; | ||||||
4219 | APValue &Val = | ||||||
4220 | Info.CurrentCall->createTemporary(VD, VD->getType(), true, Result); | ||||||
4221 | |||||||
4222 | const Expr *InitE = VD->getInit(); | ||||||
4223 | if (!InitE) { | ||||||
4224 | Val = getDefaultInitValue(VD->getType()); | ||||||
4225 | return true; | ||||||
4226 | } | ||||||
4227 | |||||||
4228 | if (InitE->isValueDependent()) | ||||||
4229 | return false; | ||||||
4230 | |||||||
4231 | if (!EvaluateInPlace(Val, Info, Result, InitE)) { | ||||||
4232 | // Wipe out any partially-computed value, to allow tracking that this | ||||||
4233 | // evaluation failed. | ||||||
4234 | Val = APValue(); | ||||||
4235 | return false; | ||||||
4236 | } | ||||||
4237 | |||||||
4238 | return true; | ||||||
4239 | } | ||||||
4240 | |||||||
4241 | static bool EvaluateDecl(EvalInfo &Info, const Decl *D) { | ||||||
4242 | bool OK = true; | ||||||
4243 | |||||||
4244 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) | ||||||
4245 | OK &= EvaluateVarDecl(Info, VD); | ||||||
4246 | |||||||
4247 | if (const DecompositionDecl *DD = dyn_cast<DecompositionDecl>(D)) | ||||||
4248 | for (auto *BD : DD->bindings()) | ||||||
4249 | if (auto *VD = BD->getHoldingVar()) | ||||||
4250 | OK &= EvaluateDecl(Info, VD); | ||||||
4251 | |||||||
4252 | return OK; | ||||||
4253 | } | ||||||
4254 | |||||||
4255 | |||||||
4256 | /// Evaluate a condition (either a variable declaration or an expression). | ||||||
4257 | static bool EvaluateCond(EvalInfo &Info, const VarDecl *CondDecl, | ||||||
4258 | const Expr *Cond, bool &Result) { | ||||||
4259 | FullExpressionRAII Scope(Info); | ||||||
4260 | if (CondDecl && !EvaluateDecl(Info, CondDecl)) | ||||||
4261 | return false; | ||||||
4262 | if (!EvaluateAsBooleanCondition(Cond, Result, Info)) | ||||||
4263 | return false; | ||||||
4264 | return Scope.destroy(); | ||||||
4265 | } | ||||||
4266 | |||||||
4267 | namespace { | ||||||
4268 | /// A location where the result (returned value) of evaluating a | ||||||
4269 | /// statement should be stored. | ||||||
4270 | struct StmtResult { | ||||||
4271 | /// The APValue that should be filled in with the returned value. | ||||||
4272 | APValue &Value; | ||||||
4273 | /// The location containing the result, if any (used to support RVO). | ||||||
4274 | const LValue *Slot; | ||||||
4275 | }; | ||||||
4276 | |||||||
4277 | struct TempVersionRAII { | ||||||
4278 | CallStackFrame &Frame; | ||||||
4279 | |||||||
4280 | TempVersionRAII(CallStackFrame &Frame) : Frame(Frame) { | ||||||
4281 | Frame.pushTempVersion(); | ||||||
4282 | } | ||||||
4283 | |||||||
4284 | ~TempVersionRAII() { | ||||||
4285 | Frame.popTempVersion(); | ||||||
4286 | } | ||||||
4287 | }; | ||||||
4288 | |||||||
4289 | } | ||||||
4290 | |||||||
4291 | static EvalStmtResult EvaluateStmt(StmtResult &Result, EvalInfo &Info, | ||||||
4292 | const Stmt *S, | ||||||
4293 | const SwitchCase *SC = nullptr); | ||||||
4294 | |||||||
4295 | /// Evaluate the body of a loop, and translate the result as appropriate. | ||||||
4296 | static EvalStmtResult EvaluateLoopBody(StmtResult &Result, EvalInfo &Info, | ||||||
4297 | const Stmt *Body, | ||||||
4298 | const SwitchCase *Case = nullptr) { | ||||||
4299 | BlockScopeRAII Scope(Info); | ||||||
4300 | |||||||
4301 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Body, Case); | ||||||
4302 | if (ESR != ESR_Failed && ESR != ESR_CaseNotFound && !Scope.destroy()) | ||||||
4303 | ESR = ESR_Failed; | ||||||
4304 | |||||||
4305 | switch (ESR) { | ||||||
4306 | case ESR_Break: | ||||||
4307 | return ESR_Succeeded; | ||||||
4308 | case ESR_Succeeded: | ||||||
4309 | case ESR_Continue: | ||||||
4310 | return ESR_Continue; | ||||||
4311 | case ESR_Failed: | ||||||
4312 | case ESR_Returned: | ||||||
4313 | case ESR_CaseNotFound: | ||||||
4314 | return ESR; | ||||||
4315 | } | ||||||
4316 | llvm_unreachable("Invalid EvalStmtResult!")::llvm::llvm_unreachable_internal("Invalid EvalStmtResult!", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 4316); | ||||||
4317 | } | ||||||
4318 | |||||||
4319 | /// Evaluate a switch statement. | ||||||
4320 | static EvalStmtResult EvaluateSwitch(StmtResult &Result, EvalInfo &Info, | ||||||
4321 | const SwitchStmt *SS) { | ||||||
4322 | BlockScopeRAII Scope(Info); | ||||||
4323 | |||||||
4324 | // Evaluate the switch condition. | ||||||
4325 | APSInt Value; | ||||||
4326 | { | ||||||
4327 | if (const Stmt *Init = SS->getInit()) { | ||||||
4328 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Init); | ||||||
4329 | if (ESR != ESR_Succeeded) { | ||||||
4330 | if (ESR != ESR_Failed && !Scope.destroy()) | ||||||
4331 | ESR = ESR_Failed; | ||||||
4332 | return ESR; | ||||||
4333 | } | ||||||
4334 | } | ||||||
4335 | |||||||
4336 | FullExpressionRAII CondScope(Info); | ||||||
4337 | if (SS->getConditionVariable() && | ||||||
4338 | !EvaluateDecl(Info, SS->getConditionVariable())) | ||||||
4339 | return ESR_Failed; | ||||||
4340 | if (!EvaluateInteger(SS->getCond(), Value, Info)) | ||||||
4341 | return ESR_Failed; | ||||||
4342 | if (!CondScope.destroy()) | ||||||
4343 | return ESR_Failed; | ||||||
4344 | } | ||||||
4345 | |||||||
4346 | // Find the switch case corresponding to the value of the condition. | ||||||
4347 | // FIXME: Cache this lookup. | ||||||
4348 | const SwitchCase *Found = nullptr; | ||||||
4349 | for (const SwitchCase *SC = SS->getSwitchCaseList(); SC; | ||||||
4350 | SC = SC->getNextSwitchCase()) { | ||||||
4351 | if (isa<DefaultStmt>(SC)) { | ||||||
4352 | Found = SC; | ||||||
4353 | continue; | ||||||
4354 | } | ||||||
4355 | |||||||
4356 | const CaseStmt *CS = cast<CaseStmt>(SC); | ||||||
4357 | APSInt LHS = CS->getLHS()->EvaluateKnownConstInt(Info.Ctx); | ||||||
4358 | APSInt RHS = CS->getRHS() ? CS->getRHS()->EvaluateKnownConstInt(Info.Ctx) | ||||||
4359 | : LHS; | ||||||
4360 | if (LHS <= Value && Value <= RHS) { | ||||||
4361 | Found = SC; | ||||||
4362 | break; | ||||||
4363 | } | ||||||
4364 | } | ||||||
4365 | |||||||
4366 | if (!Found) | ||||||
4367 | return Scope.destroy() ? ESR_Failed : ESR_Succeeded; | ||||||
4368 | |||||||
4369 | // Search the switch body for the switch case and evaluate it from there. | ||||||
4370 | EvalStmtResult ESR = EvaluateStmt(Result, Info, SS->getBody(), Found); | ||||||
4371 | if (ESR != ESR_Failed && ESR != ESR_CaseNotFound && !Scope.destroy()) | ||||||
4372 | return ESR_Failed; | ||||||
4373 | |||||||
4374 | switch (ESR) { | ||||||
4375 | case ESR_Break: | ||||||
4376 | return ESR_Succeeded; | ||||||
4377 | case ESR_Succeeded: | ||||||
4378 | case ESR_Continue: | ||||||
4379 | case ESR_Failed: | ||||||
4380 | case ESR_Returned: | ||||||
4381 | return ESR; | ||||||
4382 | case ESR_CaseNotFound: | ||||||
4383 | // This can only happen if the switch case is nested within a statement | ||||||
4384 | // expression. We have no intention of supporting that. | ||||||
4385 | Info.FFDiag(Found->getBeginLoc(), | ||||||
4386 | diag::note_constexpr_stmt_expr_unsupported); | ||||||
4387 | return ESR_Failed; | ||||||
4388 | } | ||||||
4389 | llvm_unreachable("Invalid EvalStmtResult!")::llvm::llvm_unreachable_internal("Invalid EvalStmtResult!", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 4389); | ||||||
4390 | } | ||||||
4391 | |||||||
4392 | // Evaluate a statement. | ||||||
4393 | static EvalStmtResult EvaluateStmt(StmtResult &Result, EvalInfo &Info, | ||||||
4394 | const Stmt *S, const SwitchCase *Case) { | ||||||
4395 | if (!Info.nextStep(S)) | ||||||
4396 | return ESR_Failed; | ||||||
4397 | |||||||
4398 | // If we're hunting down a 'case' or 'default' label, recurse through | ||||||
4399 | // substatements until we hit the label. | ||||||
4400 | if (Case) { | ||||||
4401 | switch (S->getStmtClass()) { | ||||||
4402 | case Stmt::CompoundStmtClass: | ||||||
4403 | // FIXME: Precompute which substatement of a compound statement we | ||||||
4404 | // would jump to, and go straight there rather than performing a | ||||||
4405 | // linear scan each time. | ||||||
4406 | case Stmt::LabelStmtClass: | ||||||
4407 | case Stmt::AttributedStmtClass: | ||||||
4408 | case Stmt::DoStmtClass: | ||||||
4409 | break; | ||||||
4410 | |||||||
4411 | case Stmt::CaseStmtClass: | ||||||
4412 | case Stmt::DefaultStmtClass: | ||||||
4413 | if (Case == S) | ||||||
4414 | Case = nullptr; | ||||||
4415 | break; | ||||||
4416 | |||||||
4417 | case Stmt::IfStmtClass: { | ||||||
4418 | // FIXME: Precompute which side of an 'if' we would jump to, and go | ||||||
4419 | // straight there rather than scanning both sides. | ||||||
4420 | const IfStmt *IS = cast<IfStmt>(S); | ||||||
4421 | |||||||
4422 | // Wrap the evaluation in a block scope, in case it's a DeclStmt | ||||||
4423 | // preceded by our switch label. | ||||||
4424 | BlockScopeRAII Scope(Info); | ||||||
4425 | |||||||
4426 | // Step into the init statement in case it brings an (uninitialized) | ||||||
4427 | // variable into scope. | ||||||
4428 | if (const Stmt *Init = IS->getInit()) { | ||||||
4429 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Init, Case); | ||||||
4430 | if (ESR != ESR_CaseNotFound) { | ||||||
4431 | assert(ESR != ESR_Succeeded)((ESR != ESR_Succeeded) ? static_cast<void> (0) : __assert_fail ("ESR != ESR_Succeeded", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 4431, __PRETTY_FUNCTION__)); | ||||||
4432 | return ESR; | ||||||
4433 | } | ||||||
4434 | } | ||||||
4435 | |||||||
4436 | // Condition variable must be initialized if it exists. | ||||||
4437 | // FIXME: We can skip evaluating the body if there's a condition | ||||||
4438 | // variable, as there can't be any case labels within it. | ||||||
4439 | // (The same is true for 'for' statements.) | ||||||
4440 | |||||||
4441 | EvalStmtResult ESR = EvaluateStmt(Result, Info, IS->getThen(), Case); | ||||||
4442 | if (ESR == ESR_Failed) | ||||||
4443 | return ESR; | ||||||
4444 | if (ESR != ESR_CaseNotFound) | ||||||
4445 | return Scope.destroy() ? ESR : ESR_Failed; | ||||||
4446 | if (!IS->getElse()) | ||||||
4447 | return ESR_CaseNotFound; | ||||||
4448 | |||||||
4449 | ESR = EvaluateStmt(Result, Info, IS->getElse(), Case); | ||||||
4450 | if (ESR == ESR_Failed) | ||||||
4451 | return ESR; | ||||||
4452 | if (ESR != ESR_CaseNotFound) | ||||||
4453 | return Scope.destroy() ? ESR : ESR_Failed; | ||||||
4454 | return ESR_CaseNotFound; | ||||||
4455 | } | ||||||
4456 | |||||||
4457 | case Stmt::WhileStmtClass: { | ||||||
4458 | EvalStmtResult ESR = | ||||||
4459 | EvaluateLoopBody(Result, Info, cast<WhileStmt>(S)->getBody(), Case); | ||||||
4460 | if (ESR != ESR_Continue) | ||||||
4461 | return ESR; | ||||||
4462 | break; | ||||||
4463 | } | ||||||
4464 | |||||||
4465 | case Stmt::ForStmtClass: { | ||||||
4466 | const ForStmt *FS = cast<ForStmt>(S); | ||||||
4467 | BlockScopeRAII Scope(Info); | ||||||
4468 | |||||||
4469 | // Step into the init statement in case it brings an (uninitialized) | ||||||
4470 | // variable into scope. | ||||||
4471 | if (const Stmt *Init = FS->getInit()) { | ||||||
4472 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Init, Case); | ||||||
4473 | if (ESR != ESR_CaseNotFound) { | ||||||
4474 | assert(ESR != ESR_Succeeded)((ESR != ESR_Succeeded) ? static_cast<void> (0) : __assert_fail ("ESR != ESR_Succeeded", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 4474, __PRETTY_FUNCTION__)); | ||||||
4475 | return ESR; | ||||||
4476 | } | ||||||
4477 | } | ||||||
4478 | |||||||
4479 | EvalStmtResult ESR = | ||||||
4480 | EvaluateLoopBody(Result, Info, FS->getBody(), Case); | ||||||
4481 | if (ESR != ESR_Continue) | ||||||
4482 | return ESR; | ||||||
4483 | if (FS->getInc()) { | ||||||
4484 | FullExpressionRAII IncScope(Info); | ||||||
4485 | if (!EvaluateIgnoredValue(Info, FS->getInc()) || !IncScope.destroy()) | ||||||
4486 | return ESR_Failed; | ||||||
4487 | } | ||||||
4488 | break; | ||||||
4489 | } | ||||||
4490 | |||||||
4491 | case Stmt::DeclStmtClass: { | ||||||
4492 | // Start the lifetime of any uninitialized variables we encounter. They | ||||||
4493 | // might be used by the selected branch of the switch. | ||||||
4494 | const DeclStmt *DS = cast<DeclStmt>(S); | ||||||
4495 | for (const auto *D : DS->decls()) { | ||||||
4496 | if (const auto *VD = dyn_cast<VarDecl>(D)) { | ||||||
4497 | if (VD->hasLocalStorage() && !VD->getInit()) | ||||||
4498 | if (!EvaluateVarDecl(Info, VD)) | ||||||
4499 | return ESR_Failed; | ||||||
4500 | // FIXME: If the variable has initialization that can't be jumped | ||||||
4501 | // over, bail out of any immediately-surrounding compound-statement | ||||||
4502 | // too. There can't be any case labels here. | ||||||
4503 | } | ||||||
4504 | } | ||||||
4505 | return ESR_CaseNotFound; | ||||||
4506 | } | ||||||
4507 | |||||||
4508 | default: | ||||||
4509 | return ESR_CaseNotFound; | ||||||
4510 | } | ||||||
4511 | } | ||||||
4512 | |||||||
4513 | switch (S->getStmtClass()) { | ||||||
4514 | default: | ||||||
4515 | if (const Expr *E = dyn_cast<Expr>(S)) { | ||||||
4516 | // Don't bother evaluating beyond an expression-statement which couldn't | ||||||
4517 | // be evaluated. | ||||||
4518 | // FIXME: Do we need the FullExpressionRAII object here? | ||||||
4519 | // VisitExprWithCleanups should create one when necessary. | ||||||
4520 | FullExpressionRAII Scope(Info); | ||||||
4521 | if (!EvaluateIgnoredValue(Info, E) || !Scope.destroy()) | ||||||
4522 | return ESR_Failed; | ||||||
4523 | return ESR_Succeeded; | ||||||
4524 | } | ||||||
4525 | |||||||
4526 | Info.FFDiag(S->getBeginLoc()); | ||||||
4527 | return ESR_Failed; | ||||||
4528 | |||||||
4529 | case Stmt::NullStmtClass: | ||||||
4530 | return ESR_Succeeded; | ||||||
4531 | |||||||
4532 | case Stmt::DeclStmtClass: { | ||||||
4533 | const DeclStmt *DS = cast<DeclStmt>(S); | ||||||
4534 | for (const auto *D : DS->decls()) { | ||||||
4535 | // Each declaration initialization is its own full-expression. | ||||||
4536 | FullExpressionRAII Scope(Info); | ||||||
4537 | if (!EvaluateDecl(Info, D) && !Info.noteFailure()) | ||||||
4538 | return ESR_Failed; | ||||||
4539 | if (!Scope.destroy()) | ||||||
4540 | return ESR_Failed; | ||||||
4541 | } | ||||||
4542 | return ESR_Succeeded; | ||||||
4543 | } | ||||||
4544 | |||||||
4545 | case Stmt::ReturnStmtClass: { | ||||||
4546 | const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); | ||||||
4547 | FullExpressionRAII Scope(Info); | ||||||
4548 | if (RetExpr && | ||||||
4549 | !(Result.Slot | ||||||
4550 | ? EvaluateInPlace(Result.Value, Info, *Result.Slot, RetExpr) | ||||||
4551 | : Evaluate(Result.Value, Info, RetExpr))) | ||||||
4552 | return ESR_Failed; | ||||||
4553 | return Scope.destroy() ? ESR_Returned : ESR_Failed; | ||||||
4554 | } | ||||||
4555 | |||||||
4556 | case Stmt::CompoundStmtClass: { | ||||||
4557 | BlockScopeRAII Scope(Info); | ||||||
4558 | |||||||
4559 | const CompoundStmt *CS = cast<CompoundStmt>(S); | ||||||
4560 | for (const auto *BI : CS->body()) { | ||||||
4561 | EvalStmtResult ESR = EvaluateStmt(Result, Info, BI, Case); | ||||||
4562 | if (ESR == ESR_Succeeded) | ||||||
4563 | Case = nullptr; | ||||||
4564 | else if (ESR != ESR_CaseNotFound) { | ||||||
4565 | if (ESR != ESR_Failed && !Scope.destroy()) | ||||||
4566 | return ESR_Failed; | ||||||
4567 | return ESR; | ||||||
4568 | } | ||||||
4569 | } | ||||||
4570 | if (Case) | ||||||
4571 | return ESR_CaseNotFound; | ||||||
4572 | return Scope.destroy() ? ESR_Succeeded : ESR_Failed; | ||||||
4573 | } | ||||||
4574 | |||||||
4575 | case Stmt::IfStmtClass: { | ||||||
4576 | const IfStmt *IS = cast<IfStmt>(S); | ||||||
4577 | |||||||
4578 | // Evaluate the condition, as either a var decl or as an expression. | ||||||
4579 | BlockScopeRAII Scope(Info); | ||||||
4580 | if (const Stmt *Init = IS->getInit()) { | ||||||
4581 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Init); | ||||||
4582 | if (ESR != ESR_Succeeded) { | ||||||
4583 | if (ESR != ESR_Failed && !Scope.destroy()) | ||||||
4584 | return ESR_Failed; | ||||||
4585 | return ESR; | ||||||
4586 | } | ||||||
4587 | } | ||||||
4588 | bool Cond; | ||||||
4589 | if (!EvaluateCond(Info, IS->getConditionVariable(), IS->getCond(), Cond)) | ||||||
4590 | return ESR_Failed; | ||||||
4591 | |||||||
4592 | if (const Stmt *SubStmt = Cond ? IS->getThen() : IS->getElse()) { | ||||||
4593 | EvalStmtResult ESR = EvaluateStmt(Result, Info, SubStmt); | ||||||
4594 | if (ESR != ESR_Succeeded) { | ||||||
4595 | if (ESR != ESR_Failed && !Scope.destroy()) | ||||||
4596 | return ESR_Failed; | ||||||
4597 | return ESR; | ||||||
4598 | } | ||||||
4599 | } | ||||||
4600 | return Scope.destroy() ? ESR_Succeeded : ESR_Failed; | ||||||
4601 | } | ||||||
4602 | |||||||
4603 | case Stmt::WhileStmtClass: { | ||||||
4604 | const WhileStmt *WS = cast<WhileStmt>(S); | ||||||
4605 | while (true) { | ||||||
4606 | BlockScopeRAII Scope(Info); | ||||||
4607 | bool Continue; | ||||||
4608 | if (!EvaluateCond(Info, WS->getConditionVariable(), WS->getCond(), | ||||||
4609 | Continue)) | ||||||
4610 | return ESR_Failed; | ||||||
4611 | if (!Continue) | ||||||
4612 | break; | ||||||
4613 | |||||||
4614 | EvalStmtResult ESR = EvaluateLoopBody(Result, Info, WS->getBody()); | ||||||
4615 | if (ESR != ESR_Continue) { | ||||||
4616 | if (ESR != ESR_Failed && !Scope.destroy()) | ||||||
4617 | return ESR_Failed; | ||||||
4618 | return ESR; | ||||||
4619 | } | ||||||
4620 | if (!Scope.destroy()) | ||||||
4621 | return ESR_Failed; | ||||||
4622 | } | ||||||
4623 | return ESR_Succeeded; | ||||||
4624 | } | ||||||
4625 | |||||||
4626 | case Stmt::DoStmtClass: { | ||||||
4627 | const DoStmt *DS = cast<DoStmt>(S); | ||||||
4628 | bool Continue; | ||||||
4629 | do { | ||||||
4630 | EvalStmtResult ESR = EvaluateLoopBody(Result, Info, DS->getBody(), Case); | ||||||
4631 | if (ESR != ESR_Continue) | ||||||
4632 | return ESR; | ||||||
4633 | Case = nullptr; | ||||||
4634 | |||||||
4635 | FullExpressionRAII CondScope(Info); | ||||||
4636 | if (!EvaluateAsBooleanCondition(DS->getCond(), Continue, Info) || | ||||||
4637 | !CondScope.destroy()) | ||||||
4638 | return ESR_Failed; | ||||||
4639 | } while (Continue); | ||||||
4640 | return ESR_Succeeded; | ||||||
4641 | } | ||||||
4642 | |||||||
4643 | case Stmt::ForStmtClass: { | ||||||
4644 | const ForStmt *FS = cast<ForStmt>(S); | ||||||
4645 | BlockScopeRAII ForScope(Info); | ||||||
4646 | if (FS->getInit()) { | ||||||
4647 | EvalStmtResult ESR = EvaluateStmt(Result, Info, FS->getInit()); | ||||||
4648 | if (ESR != ESR_Succeeded) { | ||||||
4649 | if (ESR != ESR_Failed && !ForScope.destroy()) | ||||||
4650 | return ESR_Failed; | ||||||
4651 | return ESR; | ||||||
4652 | } | ||||||
4653 | } | ||||||
4654 | while (true) { | ||||||
4655 | BlockScopeRAII IterScope(Info); | ||||||
4656 | bool Continue = true; | ||||||
4657 | if (FS->getCond() && !EvaluateCond(Info, FS->getConditionVariable(), | ||||||
4658 | FS->getCond(), Continue)) | ||||||
4659 | return ESR_Failed; | ||||||
4660 | if (!Continue) | ||||||
4661 | break; | ||||||
4662 | |||||||
4663 | EvalStmtResult ESR = EvaluateLoopBody(Result, Info, FS->getBody()); | ||||||
4664 | if (ESR != ESR_Continue) { | ||||||
4665 | if (ESR != ESR_Failed && (!IterScope.destroy() || !ForScope.destroy())) | ||||||
4666 | return ESR_Failed; | ||||||
4667 | return ESR; | ||||||
4668 | } | ||||||
4669 | |||||||
4670 | if (FS->getInc()) { | ||||||
4671 | FullExpressionRAII IncScope(Info); | ||||||
4672 | if (!EvaluateIgnoredValue(Info, FS->getInc()) || !IncScope.destroy()) | ||||||
4673 | return ESR_Failed; | ||||||
4674 | } | ||||||
4675 | |||||||
4676 | if (!IterScope.destroy()) | ||||||
4677 | return ESR_Failed; | ||||||
4678 | } | ||||||
4679 | return ForScope.destroy() ? ESR_Succeeded : ESR_Failed; | ||||||
4680 | } | ||||||
4681 | |||||||
4682 | case Stmt::CXXForRangeStmtClass: { | ||||||
4683 | const CXXForRangeStmt *FS = cast<CXXForRangeStmt>(S); | ||||||
4684 | BlockScopeRAII Scope(Info); | ||||||
4685 | |||||||
4686 | // Evaluate the init-statement if present. | ||||||
4687 | if (FS->getInit()) { | ||||||
4688 | EvalStmtResult ESR = EvaluateStmt(Result, Info, FS->getInit()); | ||||||
4689 | if (ESR != ESR_Succeeded) { | ||||||
4690 | if (ESR != ESR_Failed && !Scope.destroy()) | ||||||
4691 | return ESR_Failed; | ||||||
4692 | return ESR; | ||||||
4693 | } | ||||||
4694 | } | ||||||
4695 | |||||||
4696 | // Initialize the __range variable. | ||||||
4697 | EvalStmtResult ESR = EvaluateStmt(Result, Info, FS->getRangeStmt()); | ||||||
4698 | if (ESR != ESR_Succeeded) { | ||||||
4699 | if (ESR != ESR_Failed && !Scope.destroy()) | ||||||
4700 | return ESR_Failed; | ||||||
4701 | return ESR; | ||||||
4702 | } | ||||||
4703 | |||||||
4704 | // Create the __begin and __end iterators. | ||||||
4705 | ESR = EvaluateStmt(Result, Info, FS->getBeginStmt()); | ||||||
4706 | if (ESR != ESR_Succeeded) { | ||||||
4707 | if (ESR != ESR_Failed && !Scope.destroy()) | ||||||
4708 | return ESR_Failed; | ||||||
4709 | return ESR; | ||||||
4710 | } | ||||||
4711 | ESR = EvaluateStmt(Result, Info, FS->getEndStmt()); | ||||||
4712 | if (ESR != ESR_Succeeded) { | ||||||
4713 | if (ESR != ESR_Failed && !Scope.destroy()) | ||||||
4714 | return ESR_Failed; | ||||||
4715 | return ESR; | ||||||
4716 | } | ||||||
4717 | |||||||
4718 | while (true) { | ||||||
4719 | // Condition: __begin != __end. | ||||||
4720 | { | ||||||
4721 | bool Continue = true; | ||||||
4722 | FullExpressionRAII CondExpr(Info); | ||||||
4723 | if (!EvaluateAsBooleanCondition(FS->getCond(), Continue, Info)) | ||||||
4724 | return ESR_Failed; | ||||||
4725 | if (!Continue) | ||||||
4726 | break; | ||||||
4727 | } | ||||||
4728 | |||||||
4729 | // User's variable declaration, initialized by *__begin. | ||||||
4730 | BlockScopeRAII InnerScope(Info); | ||||||
4731 | ESR = EvaluateStmt(Result, Info, FS->getLoopVarStmt()); | ||||||
4732 | if (ESR != ESR_Succeeded) { | ||||||
4733 | if (ESR != ESR_Failed && (!InnerScope.destroy() || !Scope.destroy())) | ||||||
4734 | return ESR_Failed; | ||||||
4735 | return ESR; | ||||||
4736 | } | ||||||
4737 | |||||||
4738 | // Loop body. | ||||||
4739 | ESR = EvaluateLoopBody(Result, Info, FS->getBody()); | ||||||
4740 | if (ESR != ESR_Continue) { | ||||||
4741 | if (ESR != ESR_Failed && (!InnerScope.destroy() || !Scope.destroy())) | ||||||
4742 | return ESR_Failed; | ||||||
4743 | return ESR; | ||||||
4744 | } | ||||||
4745 | |||||||
4746 | // Increment: ++__begin | ||||||
4747 | if (!EvaluateIgnoredValue(Info, FS->getInc())) | ||||||
4748 | return ESR_Failed; | ||||||
4749 | |||||||
4750 | if (!InnerScope.destroy()) | ||||||
4751 | return ESR_Failed; | ||||||
4752 | } | ||||||
4753 | |||||||
4754 | return Scope.destroy() ? ESR_Succeeded : ESR_Failed; | ||||||
4755 | } | ||||||
4756 | |||||||
4757 | case Stmt::SwitchStmtClass: | ||||||
4758 | return EvaluateSwitch(Result, Info, cast<SwitchStmt>(S)); | ||||||
4759 | |||||||
4760 | case Stmt::ContinueStmtClass: | ||||||
4761 | return ESR_Continue; | ||||||
4762 | |||||||
4763 | case Stmt::BreakStmtClass: | ||||||
4764 | return ESR_Break; | ||||||
4765 | |||||||
4766 | case Stmt::LabelStmtClass: | ||||||
4767 | return EvaluateStmt(Result, Info, cast<LabelStmt>(S)->getSubStmt(), Case); | ||||||
4768 | |||||||
4769 | case Stmt::AttributedStmtClass: | ||||||
4770 | // As a general principle, C++11 attributes can be ignored without | ||||||
4771 | // any semantic impact. | ||||||
4772 | return EvaluateStmt(Result, Info, cast<AttributedStmt>(S)->getSubStmt(), | ||||||
4773 | Case); | ||||||
4774 | |||||||
4775 | case Stmt::CaseStmtClass: | ||||||
4776 | case Stmt::DefaultStmtClass: | ||||||
4777 | return EvaluateStmt(Result, Info, cast<SwitchCase>(S)->getSubStmt(), Case); | ||||||
4778 | case Stmt::CXXTryStmtClass: | ||||||
4779 | // Evaluate try blocks by evaluating all sub statements. | ||||||
4780 | return EvaluateStmt(Result, Info, cast<CXXTryStmt>(S)->getTryBlock(), Case); | ||||||
4781 | } | ||||||
4782 | } | ||||||
4783 | |||||||
4784 | /// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial | ||||||
4785 | /// default constructor. If so, we'll fold it whether or not it's marked as | ||||||
4786 | /// constexpr. If it is marked as constexpr, we will never implicitly define it, | ||||||
4787 | /// so we need special handling. | ||||||
4788 | static bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, | ||||||
4789 | const CXXConstructorDecl *CD, | ||||||
4790 | bool IsValueInitialization) { | ||||||
4791 | if (!CD->isTrivial() || !CD->isDefaultConstructor()) | ||||||
4792 | return false; | ||||||
4793 | |||||||
4794 | // Value-initialization does not call a trivial default constructor, so such a | ||||||
4795 | // call is a core constant expression whether or not the constructor is | ||||||
4796 | // constexpr. | ||||||
4797 | if (!CD->isConstexpr() && !IsValueInitialization) { | ||||||
4798 | if (Info.getLangOpts().CPlusPlus11) { | ||||||
4799 | // FIXME: If DiagDecl is an implicitly-declared special member function, | ||||||
4800 | // we should be much more explicit about why it's not constexpr. | ||||||
4801 | Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) | ||||||
4802 | << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; | ||||||
4803 | Info.Note(CD->getLocation(), diag::note_declared_at); | ||||||
4804 | } else { | ||||||
4805 | Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); | ||||||
4806 | } | ||||||
4807 | } | ||||||
4808 | return true; | ||||||
4809 | } | ||||||
4810 | |||||||
4811 | /// CheckConstexprFunction - Check that a function can be called in a constant | ||||||
4812 | /// expression. | ||||||
4813 | static bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, | ||||||
4814 | const FunctionDecl *Declaration, | ||||||
4815 | const FunctionDecl *Definition, | ||||||
4816 | const Stmt *Body) { | ||||||
4817 | // Potential constant expressions can contain calls to declared, but not yet | ||||||
4818 | // defined, constexpr functions. | ||||||
4819 | if (Info.checkingPotentialConstantExpression() && !Definition && | ||||||
4820 | Declaration->isConstexpr()) | ||||||
4821 | return false; | ||||||
4822 | |||||||
4823 | // Bail out if the function declaration itself is invalid. We will | ||||||
4824 | // have produced a relevant diagnostic while parsing it, so just | ||||||
4825 | // note the problematic sub-expression. | ||||||
4826 | if (Declaration->isInvalidDecl()) { | ||||||
4827 | Info.FFDiag(CallLoc, diag::note_invalid_subexpr_in_const_expr); | ||||||
4828 | return false; | ||||||
4829 | } | ||||||
4830 | |||||||
4831 | // DR1872: An instantiated virtual constexpr function can't be called in a | ||||||
4832 | // constant expression (prior to C++20). We can still constant-fold such a | ||||||
4833 | // call. | ||||||
4834 | if (!Info.Ctx.getLangOpts().CPlusPlus2a && isa<CXXMethodDecl>(Declaration) && | ||||||
4835 | cast<CXXMethodDecl>(Declaration)->isVirtual()) | ||||||
4836 | Info.CCEDiag(CallLoc, diag::note_constexpr_virtual_call); | ||||||
4837 | |||||||
4838 | if (Definition && Definition->isInvalidDecl()) { | ||||||
4839 | Info.FFDiag(CallLoc, diag::note_invalid_subexpr_in_const_expr); | ||||||
4840 | return false; | ||||||
4841 | } | ||||||
4842 | |||||||
4843 | // Can we evaluate this function call? | ||||||
4844 | if (Definition
| ||||||
4845 | return true; | ||||||
4846 | |||||||
4847 | if (Info.getLangOpts().CPlusPlus11) { | ||||||
4848 | const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; | ||||||
4849 | |||||||
4850 | // If this function is not constexpr because it is an inherited | ||||||
4851 | // non-constexpr constructor, diagnose that directly. | ||||||
4852 | auto *CD = dyn_cast<CXXConstructorDecl>(DiagDecl); | ||||||
4853 | if (CD && CD->isInheritingConstructor()) { | ||||||
4854 | auto *Inherited = CD->getInheritedConstructor().getConstructor(); | ||||||
4855 | if (!Inherited->isConstexpr()) | ||||||
4856 | DiagDecl = CD = Inherited; | ||||||
4857 | } | ||||||
4858 | |||||||
4859 | // FIXME: If DiagDecl is an implicitly-declared special member function | ||||||
4860 | // or an inheriting constructor, we should be much more explicit about why | ||||||
4861 | // it's not constexpr. | ||||||
4862 | if (CD && CD->isInheritingConstructor()) | ||||||
4863 | Info.FFDiag(CallLoc, diag::note_constexpr_invalid_inhctor, 1) | ||||||
4864 | << CD->getInheritedConstructor().getConstructor()->getParent(); | ||||||
4865 | else | ||||||
4866 | Info.FFDiag(CallLoc, diag::note_constexpr_invalid_function, 1) | ||||||
4867 | << DiagDecl->isConstexpr() << (bool)CD << DiagDecl; | ||||||
4868 | Info.Note(DiagDecl->getLocation(), diag::note_declared_at); | ||||||
4869 | } else { | ||||||
4870 | Info.FFDiag(CallLoc, diag::note_invalid_subexpr_in_const_expr); | ||||||
4871 | } | ||||||
4872 | return false; | ||||||
4873 | } | ||||||
4874 | |||||||
4875 | namespace { | ||||||
4876 | struct CheckDynamicTypeHandler { | ||||||
4877 | AccessKinds AccessKind; | ||||||
4878 | typedef bool result_type; | ||||||
4879 | bool failed() { return false; } | ||||||
4880 | bool found(APValue &Subobj, QualType SubobjType) { return true; } | ||||||
4881 | bool found(APSInt &Value, QualType SubobjType) { return true; } | ||||||
4882 | bool found(APFloat &Value, QualType SubobjType) { return true; } | ||||||
4883 | }; | ||||||
4884 | } // end anonymous namespace | ||||||
4885 | |||||||
4886 | /// Check that we can access the notional vptr of an object / determine its | ||||||
4887 | /// dynamic type. | ||||||
4888 | static bool checkDynamicType(EvalInfo &Info, const Expr *E, const LValue &This, | ||||||
4889 | AccessKinds AK, bool Polymorphic) { | ||||||
4890 | if (This.Designator.Invalid) | ||||||
4891 | return false; | ||||||
4892 | |||||||
4893 | CompleteObject Obj = findCompleteObject(Info, E, AK, This, QualType()); | ||||||
4894 | |||||||
4895 | if (!Obj) | ||||||
4896 | return false; | ||||||
4897 | |||||||
4898 | if (!Obj.Value) { | ||||||
4899 | // The object is not usable in constant expressions, so we can't inspect | ||||||
4900 | // its value to see if it's in-lifetime or what the active union members | ||||||
4901 | // are. We can still check for a one-past-the-end lvalue. | ||||||
4902 | if (This.Designator.isOnePastTheEnd() || | ||||||
4903 | This.Designator.isMostDerivedAnUnsizedArray()) { | ||||||
4904 | Info.FFDiag(E, This.Designator.isOnePastTheEnd() | ||||||
4905 | ? diag::note_constexpr_access_past_end | ||||||
4906 | : diag::note_constexpr_access_unsized_array) | ||||||
4907 | << AK; | ||||||
4908 | return false; | ||||||
4909 | } else if (Polymorphic) { | ||||||
4910 | // Conservatively refuse to perform a polymorphic operation if we would | ||||||
4911 | // not be able to read a notional 'vptr' value. | ||||||
4912 | APValue Val; | ||||||
4913 | This.moveInto(Val); | ||||||
4914 | QualType StarThisType = | ||||||
4915 | Info.Ctx.getLValueReferenceType(This.Designator.getType(Info.Ctx)); | ||||||
4916 | Info.FFDiag(E, diag::note_constexpr_polymorphic_unknown_dynamic_type) | ||||||
4917 | << AK << Val.getAsString(Info.Ctx, StarThisType); | ||||||
4918 | return false; | ||||||
4919 | } | ||||||
4920 | return true; | ||||||
4921 | } | ||||||
4922 | |||||||
4923 | CheckDynamicTypeHandler Handler{AK}; | ||||||
4924 | return Obj && findSubobject(Info, E, Obj, This.Designator, Handler); | ||||||
4925 | } | ||||||
4926 | |||||||
4927 | /// Check that the pointee of the 'this' pointer in a member function call is | ||||||
4928 | /// either within its lifetime or in its period of construction or destruction. | ||||||
4929 | static bool | ||||||
4930 | checkNonVirtualMemberCallThisPointer(EvalInfo &Info, const Expr *E, | ||||||
4931 | const LValue &This, | ||||||
4932 | const CXXMethodDecl *NamedMember) { | ||||||
4933 | return checkDynamicType( | ||||||
4934 | Info, E, This, | ||||||
4935 | isa<CXXDestructorDecl>(NamedMember) ? AK_Destroy : AK_MemberCall, false); | ||||||
4936 | } | ||||||
4937 | |||||||
4938 | struct DynamicType { | ||||||
4939 | /// The dynamic class type of the object. | ||||||
4940 | const CXXRecordDecl *Type; | ||||||
4941 | /// The corresponding path length in the lvalue. | ||||||
4942 | unsigned PathLength; | ||||||
4943 | }; | ||||||
4944 | |||||||
4945 | static const CXXRecordDecl *getBaseClassType(SubobjectDesignator &Designator, | ||||||
4946 | unsigned PathLength) { | ||||||
4947 | assert(PathLength >= Designator.MostDerivedPathLength && PathLength <=((PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && "invalid path length" ) ? static_cast<void> (0) : __assert_fail ("PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && \"invalid path length\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 4948, __PRETTY_FUNCTION__)) | ||||||
4948 | Designator.Entries.size() && "invalid path length")((PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && "invalid path length" ) ? static_cast<void> (0) : __assert_fail ("PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && \"invalid path length\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 4948, __PRETTY_FUNCTION__)); | ||||||
4949 | return (PathLength == Designator.MostDerivedPathLength) | ||||||
4950 | ? Designator.MostDerivedType->getAsCXXRecordDecl() | ||||||
4951 | : getAsBaseClass(Designator.Entries[PathLength - 1]); | ||||||
4952 | } | ||||||
4953 | |||||||
4954 | /// Determine the dynamic type of an object. | ||||||
4955 | static Optional<DynamicType> ComputeDynamicType(EvalInfo &Info, const Expr *E, | ||||||
4956 | LValue &This, AccessKinds AK) { | ||||||
4957 | // If we don't have an lvalue denoting an object of class type, there is no | ||||||
4958 | // meaningful dynamic type. (We consider objects of non-class type to have no | ||||||
4959 | // dynamic type.) | ||||||
4960 | if (!checkDynamicType(Info, E, This, AK, true)) | ||||||
4961 | return None; | ||||||
4962 | |||||||
4963 | // Refuse to compute a dynamic type in the presence of virtual bases. This | ||||||
4964 | // shouldn't happen other than in constant-folding situations, since literal | ||||||
4965 | // types can't have virtual bases. | ||||||
4966 | // | ||||||
4967 | // Note that consumers of DynamicType assume that the type has no virtual | ||||||
4968 | // bases, and will need modifications if this restriction is relaxed. | ||||||
4969 | const CXXRecordDecl *Class = | ||||||
4970 | This.Designator.MostDerivedType->getAsCXXRecordDecl(); | ||||||
4971 | if (!Class || Class->getNumVBases()) { | ||||||
4972 | Info.FFDiag(E); | ||||||
4973 | return None; | ||||||
4974 | } | ||||||
4975 | |||||||
4976 | // FIXME: For very deep class hierarchies, it might be beneficial to use a | ||||||
4977 | // binary search here instead. But the overwhelmingly common case is that | ||||||
4978 | // we're not in the middle of a constructor, so it probably doesn't matter | ||||||
4979 | // in practice. | ||||||
4980 | ArrayRef<APValue::LValuePathEntry> Path = This.Designator.Entries; | ||||||
4981 | for (unsigned PathLength = This.Designator.MostDerivedPathLength; | ||||||
4982 | PathLength <= Path.size(); ++PathLength) { | ||||||
4983 | switch (Info.isEvaluatingCtorDtor(This.getLValueBase(), | ||||||
4984 | Path.slice(0, PathLength))) { | ||||||
4985 | case ConstructionPhase::Bases: | ||||||
4986 | case ConstructionPhase::DestroyingBases: | ||||||
4987 | // We're constructing or destroying a base class. This is not the dynamic | ||||||
4988 | // type. | ||||||
4989 | break; | ||||||
4990 | |||||||
4991 | case ConstructionPhase::None: | ||||||
4992 | case ConstructionPhase::AfterBases: | ||||||
4993 | case ConstructionPhase::Destroying: | ||||||
4994 | // We've finished constructing the base classes and not yet started | ||||||
4995 | // destroying them again, so this is the dynamic type. | ||||||
4996 | return DynamicType{getBaseClassType(This.Designator, PathLength), | ||||||
4997 | PathLength}; | ||||||
4998 | } | ||||||
4999 | } | ||||||
5000 | |||||||
5001 | // CWG issue 1517: we're constructing a base class of the object described by | ||||||
5002 | // 'This', so that object has not yet begun its period of construction and | ||||||
5003 | // any polymorphic operation on it results in undefined behavior. | ||||||
5004 | Info.FFDiag(E); | ||||||
5005 | return None; | ||||||
5006 | } | ||||||
5007 | |||||||
5008 | /// Perform virtual dispatch. | ||||||
5009 | static const CXXMethodDecl *HandleVirtualDispatch( | ||||||
5010 | EvalInfo &Info, const Expr *E, LValue &This, const CXXMethodDecl *Found, | ||||||
5011 | llvm::SmallVectorImpl<QualType> &CovariantAdjustmentPath) { | ||||||
5012 | Optional<DynamicType> DynType = ComputeDynamicType( | ||||||
5013 | Info, E, This, | ||||||
5014 | isa<CXXDestructorDecl>(Found) ? AK_Destroy : AK_MemberCall); | ||||||
5015 | if (!DynType) | ||||||
5016 | return nullptr; | ||||||
5017 | |||||||
5018 | // Find the final overrider. It must be declared in one of the classes on the | ||||||
5019 | // path from the dynamic type to the static type. | ||||||
5020 | // FIXME: If we ever allow literal types to have virtual base classes, that | ||||||
5021 | // won't be true. | ||||||
5022 | const CXXMethodDecl *Callee = Found; | ||||||
5023 | unsigned PathLength = DynType->PathLength; | ||||||
5024 | for (/**/; PathLength <= This.Designator.Entries.size(); ++PathLength) { | ||||||
5025 | const CXXRecordDecl *Class = getBaseClassType(This.Designator, PathLength); | ||||||
5026 | const CXXMethodDecl *Overrider = | ||||||
5027 | Found->getCorrespondingMethodDeclaredInClass(Class, false); | ||||||
5028 | if (Overrider) { | ||||||
5029 | Callee = Overrider; | ||||||
5030 | break; | ||||||
5031 | } | ||||||
5032 | } | ||||||
5033 | |||||||
5034 | // C++2a [class.abstract]p6: | ||||||
5035 | // the effect of making a virtual call to a pure virtual function [...] is | ||||||
5036 | // undefined | ||||||
5037 | if (Callee->isPure()) { | ||||||
5038 | Info.FFDiag(E, diag::note_constexpr_pure_virtual_call, 1) << Callee; | ||||||
5039 | Info.Note(Callee->getLocation(), diag::note_declared_at); | ||||||
5040 | return nullptr; | ||||||
5041 | } | ||||||
5042 | |||||||
5043 | // If necessary, walk the rest of the path to determine the sequence of | ||||||
5044 | // covariant adjustment steps to apply. | ||||||
5045 | if (!Info.Ctx.hasSameUnqualifiedType(Callee->getReturnType(), | ||||||
5046 | Found->getReturnType())) { | ||||||
5047 | CovariantAdjustmentPath.push_back(Callee->getReturnType()); | ||||||
5048 | for (unsigned CovariantPathLength = PathLength + 1; | ||||||
5049 | CovariantPathLength != This.Designator.Entries.size(); | ||||||
5050 | ++CovariantPathLength) { | ||||||
5051 | const CXXRecordDecl *NextClass = | ||||||
5052 | getBaseClassType(This.Designator, CovariantPathLength); | ||||||
5053 | const CXXMethodDecl *Next = | ||||||
5054 | Found->getCorrespondingMethodDeclaredInClass(NextClass, false); | ||||||
5055 | if (Next && !Info.Ctx.hasSameUnqualifiedType( | ||||||
5056 | Next->getReturnType(), CovariantAdjustmentPath.back())) | ||||||
5057 | CovariantAdjustmentPath.push_back(Next->getReturnType()); | ||||||
5058 | } | ||||||
5059 | if (!Info.Ctx.hasSameUnqualifiedType(Found->getReturnType(), | ||||||
5060 | CovariantAdjustmentPath.back())) | ||||||
5061 | CovariantAdjustmentPath.push_back(Found->getReturnType()); | ||||||
5062 | } | ||||||
5063 | |||||||
5064 | // Perform 'this' adjustment. | ||||||
5065 | if (!CastToDerivedClass(Info, E, This, Callee->getParent(), PathLength)) | ||||||
5066 | return nullptr; | ||||||
5067 | |||||||
5068 | return Callee; | ||||||
5069 | } | ||||||
5070 | |||||||
5071 | /// Perform the adjustment from a value returned by a virtual function to | ||||||
5072 | /// a value of the statically expected type, which may be a pointer or | ||||||
5073 | /// reference to a base class of the returned type. | ||||||
5074 | static bool HandleCovariantReturnAdjustment(EvalInfo &Info, const Expr *E, | ||||||
5075 | APValue &Result, | ||||||
5076 | ArrayRef<QualType> Path) { | ||||||
5077 | assert(Result.isLValue() &&((Result.isLValue() && "unexpected kind of APValue for covariant return" ) ? static_cast<void> (0) : __assert_fail ("Result.isLValue() && \"unexpected kind of APValue for covariant return\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5078, __PRETTY_FUNCTION__)) | ||||||
5078 | "unexpected kind of APValue for covariant return")((Result.isLValue() && "unexpected kind of APValue for covariant return" ) ? static_cast<void> (0) : __assert_fail ("Result.isLValue() && \"unexpected kind of APValue for covariant return\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5078, __PRETTY_FUNCTION__)); | ||||||
5079 | if (Result.isNullPointer()) | ||||||
5080 | return true; | ||||||
5081 | |||||||
5082 | LValue LVal; | ||||||
5083 | LVal.setFrom(Info.Ctx, Result); | ||||||
5084 | |||||||
5085 | const CXXRecordDecl *OldClass = Path[0]->getPointeeCXXRecordDecl(); | ||||||
5086 | for (unsigned I = 1; I != Path.size(); ++I) { | ||||||
5087 | const CXXRecordDecl *NewClass = Path[I]->getPointeeCXXRecordDecl(); | ||||||
5088 | assert(OldClass && NewClass && "unexpected kind of covariant return")((OldClass && NewClass && "unexpected kind of covariant return" ) ? static_cast<void> (0) : __assert_fail ("OldClass && NewClass && \"unexpected kind of covariant return\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5088, __PRETTY_FUNCTION__)); | ||||||
5089 | if (OldClass != NewClass && | ||||||
5090 | !CastToBaseClass(Info, E, LVal, OldClass, NewClass)) | ||||||
5091 | return false; | ||||||
5092 | OldClass = NewClass; | ||||||
5093 | } | ||||||
5094 | |||||||
5095 | LVal.moveInto(Result); | ||||||
5096 | return true; | ||||||
5097 | } | ||||||
5098 | |||||||
5099 | /// Determine whether \p Base, which is known to be a direct base class of | ||||||
5100 | /// \p Derived, is a public base class. | ||||||
5101 | static bool isBaseClassPublic(const CXXRecordDecl *Derived, | ||||||
5102 | const CXXRecordDecl *Base) { | ||||||
5103 | for (const CXXBaseSpecifier &BaseSpec : Derived->bases()) { | ||||||
5104 | auto *BaseClass = BaseSpec.getType()->getAsCXXRecordDecl(); | ||||||
5105 | if (BaseClass && declaresSameEntity(BaseClass, Base)) | ||||||
5106 | return BaseSpec.getAccessSpecifier() == AS_public; | ||||||
5107 | } | ||||||
5108 | llvm_unreachable("Base is not a direct base of Derived")::llvm::llvm_unreachable_internal("Base is not a direct base of Derived" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5108); | ||||||
5109 | } | ||||||
5110 | |||||||
5111 | /// Apply the given dynamic cast operation on the provided lvalue. | ||||||
5112 | /// | ||||||
5113 | /// This implements the hard case of dynamic_cast, requiring a "runtime check" | ||||||
5114 | /// to find a suitable target subobject. | ||||||
5115 | static bool HandleDynamicCast(EvalInfo &Info, const ExplicitCastExpr *E, | ||||||
5116 | LValue &Ptr) { | ||||||
5117 | // We can't do anything with a non-symbolic pointer value. | ||||||
5118 | SubobjectDesignator &D = Ptr.Designator; | ||||||
5119 | if (D.Invalid) | ||||||
5120 | return false; | ||||||
5121 | |||||||
5122 | // C++ [expr.dynamic.cast]p6: | ||||||
5123 | // If v is a null pointer value, the result is a null pointer value. | ||||||
5124 | if (Ptr.isNullPointer() && !E->isGLValue()) | ||||||
5125 | return true; | ||||||
5126 | |||||||
5127 | // For all the other cases, we need the pointer to point to an object within | ||||||
5128 | // its lifetime / period of construction / destruction, and we need to know | ||||||
5129 | // its dynamic type. | ||||||
5130 | Optional<DynamicType> DynType = | ||||||
5131 | ComputeDynamicType(Info, E, Ptr, AK_DynamicCast); | ||||||
5132 | if (!DynType) | ||||||
5133 | return false; | ||||||
5134 | |||||||
5135 | // C++ [expr.dynamic.cast]p7: | ||||||
5136 | // If T is "pointer to cv void", then the result is a pointer to the most | ||||||
5137 | // derived object | ||||||
5138 | if (E->getType()->isVoidPointerType()) | ||||||
5139 | return CastToDerivedClass(Info, E, Ptr, DynType->Type, DynType->PathLength); | ||||||
5140 | |||||||
5141 | const CXXRecordDecl *C = E->getTypeAsWritten()->getPointeeCXXRecordDecl(); | ||||||
5142 | assert(C && "dynamic_cast target is not void pointer nor class")((C && "dynamic_cast target is not void pointer nor class" ) ? static_cast<void> (0) : __assert_fail ("C && \"dynamic_cast target is not void pointer nor class\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5142, __PRETTY_FUNCTION__)); | ||||||
5143 | CanQualType CQT = Info.Ctx.getCanonicalType(Info.Ctx.getRecordType(C)); | ||||||
5144 | |||||||
5145 | auto RuntimeCheckFailed = [&] (CXXBasePaths *Paths) { | ||||||
5146 | // C++ [expr.dynamic.cast]p9: | ||||||
5147 | if (!E->isGLValue()) { | ||||||
5148 | // The value of a failed cast to pointer type is the null pointer value | ||||||
5149 | // of the required result type. | ||||||
5150 | auto TargetVal = Info.Ctx.getTargetNullPointerValue(E->getType()); | ||||||
5151 | Ptr.setNull(E->getType(), TargetVal); | ||||||
5152 | return true; | ||||||
5153 | } | ||||||
5154 | |||||||
5155 | // A failed cast to reference type throws [...] std::bad_cast. | ||||||
5156 | unsigned DiagKind; | ||||||
5157 | if (!Paths && (declaresSameEntity(DynType->Type, C) || | ||||||
5158 | DynType->Type->isDerivedFrom(C))) | ||||||
5159 | DiagKind = 0; | ||||||
5160 | else if (!Paths || Paths->begin() == Paths->end()) | ||||||
5161 | DiagKind = 1; | ||||||
5162 | else if (Paths->isAmbiguous(CQT)) | ||||||
5163 | DiagKind = 2; | ||||||
5164 | else { | ||||||
5165 | assert(Paths->front().Access != AS_public && "why did the cast fail?")((Paths->front().Access != AS_public && "why did the cast fail?" ) ? static_cast<void> (0) : __assert_fail ("Paths->front().Access != AS_public && \"why did the cast fail?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5165, __PRETTY_FUNCTION__)); | ||||||
5166 | DiagKind = 3; | ||||||
5167 | } | ||||||
5168 | Info.FFDiag(E, diag::note_constexpr_dynamic_cast_to_reference_failed) | ||||||
5169 | << DiagKind << Ptr.Designator.getType(Info.Ctx) | ||||||
5170 | << Info.Ctx.getRecordType(DynType->Type) | ||||||
5171 | << E->getType().getUnqualifiedType(); | ||||||
5172 | return false; | ||||||
5173 | }; | ||||||
5174 | |||||||
5175 | // Runtime check, phase 1: | ||||||
5176 | // Walk from the base subobject towards the derived object looking for the | ||||||
5177 | // target type. | ||||||
5178 | for (int PathLength = Ptr.Designator.Entries.size(); | ||||||
5179 | PathLength >= (int)DynType->PathLength; --PathLength) { | ||||||
5180 | const CXXRecordDecl *Class = getBaseClassType(Ptr.Designator, PathLength); | ||||||
5181 | if (declaresSameEntity(Class, C)) | ||||||
5182 | return CastToDerivedClass(Info, E, Ptr, Class, PathLength); | ||||||
5183 | // We can only walk across public inheritance edges. | ||||||
5184 | if (PathLength > (int)DynType->PathLength && | ||||||
5185 | !isBaseClassPublic(getBaseClassType(Ptr.Designator, PathLength - 1), | ||||||
5186 | Class)) | ||||||
5187 | return RuntimeCheckFailed(nullptr); | ||||||
5188 | } | ||||||
5189 | |||||||
5190 | // Runtime check, phase 2: | ||||||
5191 | // Search the dynamic type for an unambiguous public base of type C. | ||||||
5192 | CXXBasePaths Paths(/*FindAmbiguities=*/true, | ||||||
5193 | /*RecordPaths=*/true, /*DetectVirtual=*/false); | ||||||
5194 | if (DynType->Type->isDerivedFrom(C, Paths) && !Paths.isAmbiguous(CQT) && | ||||||
5195 | Paths.front().Access == AS_public) { | ||||||
5196 | // Downcast to the dynamic type... | ||||||
5197 | if (!CastToDerivedClass(Info, E, Ptr, DynType->Type, DynType->PathLength)) | ||||||
5198 | return false; | ||||||
5199 | // ... then upcast to the chosen base class subobject. | ||||||
5200 | for (CXXBasePathElement &Elem : Paths.front()) | ||||||
5201 | if (!HandleLValueBase(Info, E, Ptr, Elem.Class, Elem.Base)) | ||||||
5202 | return false; | ||||||
5203 | return true; | ||||||
5204 | } | ||||||
5205 | |||||||
5206 | // Otherwise, the runtime check fails. | ||||||
5207 | return RuntimeCheckFailed(&Paths); | ||||||
5208 | } | ||||||
5209 | |||||||
5210 | namespace { | ||||||
5211 | struct StartLifetimeOfUnionMemberHandler { | ||||||
5212 | const FieldDecl *Field; | ||||||
5213 | |||||||
5214 | static const AccessKinds AccessKind = AK_Assign; | ||||||
5215 | |||||||
5216 | typedef bool result_type; | ||||||
5217 | bool failed() { return false; } | ||||||
5218 | bool found(APValue &Subobj, QualType SubobjType) { | ||||||
5219 | // We are supposed to perform no initialization but begin the lifetime of | ||||||
5220 | // the object. We interpret that as meaning to do what default | ||||||
5221 | // initialization of the object would do if all constructors involved were | ||||||
5222 | // trivial: | ||||||
5223 | // * All base, non-variant member, and array element subobjects' lifetimes | ||||||
5224 | // begin | ||||||
5225 | // * No variant members' lifetimes begin | ||||||
5226 | // * All scalar subobjects whose lifetimes begin have indeterminate values | ||||||
5227 | assert(SubobjType->isUnionType())((SubobjType->isUnionType()) ? static_cast<void> (0) : __assert_fail ("SubobjType->isUnionType()", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5227, __PRETTY_FUNCTION__)); | ||||||
5228 | if (!declaresSameEntity(Subobj.getUnionField(), Field) || | ||||||
5229 | !Subobj.getUnionValue().hasValue()) | ||||||
5230 | Subobj.setUnion(Field, getDefaultInitValue(Field->getType())); | ||||||
5231 | return true; | ||||||
5232 | } | ||||||
5233 | bool found(APSInt &Value, QualType SubobjType) { | ||||||
5234 | llvm_unreachable("wrong value kind for union object")::llvm::llvm_unreachable_internal("wrong value kind for union object" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5234); | ||||||
5235 | } | ||||||
5236 | bool found(APFloat &Value, QualType SubobjType) { | ||||||
5237 | llvm_unreachable("wrong value kind for union object")::llvm::llvm_unreachable_internal("wrong value kind for union object" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5237); | ||||||
5238 | } | ||||||
5239 | }; | ||||||
5240 | } // end anonymous namespace | ||||||
5241 | |||||||
5242 | const AccessKinds StartLifetimeOfUnionMemberHandler::AccessKind; | ||||||
5243 | |||||||
5244 | /// Handle a builtin simple-assignment or a call to a trivial assignment | ||||||
5245 | /// operator whose left-hand side might involve a union member access. If it | ||||||
5246 | /// does, implicitly start the lifetime of any accessed union elements per | ||||||
5247 | /// C++20 [class.union]5. | ||||||
5248 | static bool HandleUnionActiveMemberChange(EvalInfo &Info, const Expr *LHSExpr, | ||||||
5249 | const LValue &LHS) { | ||||||
5250 | if (LHS.InvalidBase || LHS.Designator.Invalid) | ||||||
5251 | return false; | ||||||
5252 | |||||||
5253 | llvm::SmallVector<std::pair<unsigned, const FieldDecl*>, 4> UnionPathLengths; | ||||||
5254 | // C++ [class.union]p5: | ||||||
5255 | // define the set S(E) of subexpressions of E as follows: | ||||||
5256 | unsigned PathLength = LHS.Designator.Entries.size(); | ||||||
5257 | for (const Expr *E = LHSExpr; E != nullptr;) { | ||||||
5258 | // -- If E is of the form A.B, S(E) contains the elements of S(A)... | ||||||
5259 | if (auto *ME = dyn_cast<MemberExpr>(E)) { | ||||||
5260 | auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()); | ||||||
5261 | if (!FD) | ||||||
5262 | break; | ||||||
5263 | |||||||
5264 | // ... and also contains A.B if B names a union member | ||||||
5265 | if (FD->getParent()->isUnion()) | ||||||
5266 | UnionPathLengths.push_back({PathLength - 1, FD}); | ||||||
5267 | |||||||
5268 | E = ME->getBase(); | ||||||
5269 | --PathLength; | ||||||
5270 | assert(declaresSameEntity(FD,((declaresSameEntity(FD, LHS.Designator.Entries[PathLength] . getAsBaseOrMember().getPointer())) ? static_cast<void> ( 0) : __assert_fail ("declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5272, __PRETTY_FUNCTION__)) | ||||||
5271 | LHS.Designator.Entries[PathLength]((declaresSameEntity(FD, LHS.Designator.Entries[PathLength] . getAsBaseOrMember().getPointer())) ? static_cast<void> ( 0) : __assert_fail ("declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5272, __PRETTY_FUNCTION__)) | ||||||
5272 | .getAsBaseOrMember().getPointer()))((declaresSameEntity(FD, LHS.Designator.Entries[PathLength] . getAsBaseOrMember().getPointer())) ? static_cast<void> ( 0) : __assert_fail ("declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5272, __PRETTY_FUNCTION__)); | ||||||
5273 | |||||||
5274 | // -- If E is of the form A[B] and is interpreted as a built-in array | ||||||
5275 | // subscripting operator, S(E) is [S(the array operand, if any)]. | ||||||
5276 | } else if (auto *ASE = dyn_cast<ArraySubscriptExpr>(E)) { | ||||||
5277 | // Step over an ArrayToPointerDecay implicit cast. | ||||||
5278 | auto *Base = ASE->getBase()->IgnoreImplicit(); | ||||||
5279 | if (!Base->getType()->isArrayType()) | ||||||
5280 | break; | ||||||
5281 | |||||||
5282 | E = Base; | ||||||
5283 | --PathLength; | ||||||
5284 | |||||||
5285 | } else if (auto *ICE = dyn_cast<ImplicitCastExpr>(E)) { | ||||||
5286 | // Step over a derived-to-base conversion. | ||||||
5287 | E = ICE->getSubExpr(); | ||||||
5288 | if (ICE->getCastKind() == CK_NoOp) | ||||||
5289 | continue; | ||||||
5290 | if (ICE->getCastKind() != CK_DerivedToBase && | ||||||
5291 | ICE->getCastKind() != CK_UncheckedDerivedToBase) | ||||||
5292 | break; | ||||||
5293 | // Walk path backwards as we walk up from the base to the derived class. | ||||||
5294 | for (const CXXBaseSpecifier *Elt : llvm::reverse(ICE->path())) { | ||||||
5295 | --PathLength; | ||||||
5296 | (void)Elt; | ||||||
5297 | assert(declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(),((declaresSameEntity(Elt->getType()->getAsCXXRecordDecl (), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer ())) ? static_cast<void> (0) : __assert_fail ("declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5299, __PRETTY_FUNCTION__)) | ||||||
5298 | LHS.Designator.Entries[PathLength]((declaresSameEntity(Elt->getType()->getAsCXXRecordDecl (), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer ())) ? static_cast<void> (0) : __assert_fail ("declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5299, __PRETTY_FUNCTION__)) | ||||||
5299 | .getAsBaseOrMember().getPointer()))((declaresSameEntity(Elt->getType()->getAsCXXRecordDecl (), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer ())) ? static_cast<void> (0) : __assert_fail ("declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5299, __PRETTY_FUNCTION__)); | ||||||
5300 | } | ||||||
5301 | |||||||
5302 | // -- Otherwise, S(E) is empty. | ||||||
5303 | } else { | ||||||
5304 | break; | ||||||
5305 | } | ||||||
5306 | } | ||||||
5307 | |||||||
5308 | // Common case: no unions' lifetimes are started. | ||||||
5309 | if (UnionPathLengths.empty()) | ||||||
5310 | return true; | ||||||
5311 | |||||||
5312 | // if modification of X [would access an inactive union member], an object | ||||||
5313 | // of the type of X is implicitly created | ||||||
5314 | CompleteObject Obj = | ||||||
5315 | findCompleteObject(Info, LHSExpr, AK_Assign, LHS, LHSExpr->getType()); | ||||||
| |||||||
5316 | if (!Obj) | ||||||
5317 | return false; | ||||||
5318 | for (std::pair<unsigned, const FieldDecl *> LengthAndField : | ||||||
5319 | llvm::reverse(UnionPathLengths)) { | ||||||
5320 | // Form a designator for the union object. | ||||||
5321 | SubobjectDesignator D = LHS.Designator; | ||||||
5322 | D.truncate(Info.Ctx, LHS.Base, LengthAndField.first); | ||||||
5323 | |||||||
5324 | StartLifetimeOfUnionMemberHandler StartLifetime{LengthAndField.second}; | ||||||
5325 | if (!findSubobject(Info, LHSExpr, Obj, D, StartLifetime)) | ||||||
5326 | return false; | ||||||
5327 | } | ||||||
5328 | |||||||
5329 | return true; | ||||||
5330 | } | ||||||
5331 | |||||||
5332 | /// Determine if a class has any fields that might need to be copied by a | ||||||
5333 | /// trivial copy or move operation. | ||||||
5334 | static bool hasFields(const CXXRecordDecl *RD) { | ||||||
5335 | if (!RD || RD->isEmpty()) | ||||||
5336 | return false; | ||||||
5337 | for (auto *FD : RD->fields()) { | ||||||
5338 | if (FD->isUnnamedBitfield()) | ||||||
5339 | continue; | ||||||
5340 | return true; | ||||||
5341 | } | ||||||
5342 | for (auto &Base : RD->bases()) | ||||||
5343 | if (hasFields(Base.getType()->getAsCXXRecordDecl())) | ||||||
5344 | return true; | ||||||
5345 | return false; | ||||||
5346 | } | ||||||
5347 | |||||||
5348 | namespace { | ||||||
5349 | typedef SmallVector<APValue, 8> ArgVector; | ||||||
5350 | } | ||||||
5351 | |||||||
5352 | /// EvaluateArgs - Evaluate the arguments to a function call. | ||||||
5353 | static bool EvaluateArgs(ArrayRef<const Expr *> Args, ArgVector &ArgValues, | ||||||
5354 | EvalInfo &Info, const FunctionDecl *Callee) { | ||||||
5355 | bool Success = true; | ||||||
5356 | llvm::SmallBitVector ForbiddenNullArgs; | ||||||
5357 | if (Callee->hasAttr<NonNullAttr>()) { | ||||||
5358 | ForbiddenNullArgs.resize(Args.size()); | ||||||
5359 | for (const auto *Attr : Callee->specific_attrs<NonNullAttr>()) { | ||||||
5360 | if (!Attr->args_size()) { | ||||||
5361 | ForbiddenNullArgs.set(); | ||||||
5362 | break; | ||||||
5363 | } else | ||||||
5364 | for (auto Idx : Attr->args()) { | ||||||
5365 | unsigned ASTIdx = Idx.getASTIndex(); | ||||||
5366 | if (ASTIdx >= Args.size()) | ||||||
5367 | continue; | ||||||
5368 | ForbiddenNullArgs[ASTIdx] = 1; | ||||||
5369 | } | ||||||
5370 | } | ||||||
5371 | } | ||||||
5372 | for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); | ||||||
5373 | I != E; ++I) { | ||||||
5374 | if (!Evaluate(ArgValues[I - Args.begin()], Info, *I)) { | ||||||
5375 | // If we're checking for a potential constant expression, evaluate all | ||||||
5376 | // initializers even if some of them fail. | ||||||
5377 | if (!Info.noteFailure()) | ||||||
5378 | return false; | ||||||
5379 | Success = false; | ||||||
5380 | } else if (!ForbiddenNullArgs.empty() && | ||||||
5381 | ForbiddenNullArgs[I - Args.begin()] && | ||||||
5382 | ArgValues[I - Args.begin()].isNullPointer()) { | ||||||
5383 | Info.CCEDiag(*I, diag::note_non_null_attribute_failed); | ||||||
5384 | if (!Info.noteFailure()) | ||||||
5385 | return false; | ||||||
5386 | Success = false; | ||||||
5387 | } | ||||||
5388 | } | ||||||
5389 | return Success; | ||||||
5390 | } | ||||||
5391 | |||||||
5392 | /// Evaluate a function call. | ||||||
5393 | static bool HandleFunctionCall(SourceLocation CallLoc, | ||||||
5394 | const FunctionDecl *Callee, const LValue *This, | ||||||
5395 | ArrayRef<const Expr*> Args, const Stmt *Body, | ||||||
5396 | EvalInfo &Info, APValue &Result, | ||||||
5397 | const LValue *ResultSlot) { | ||||||
5398 | ArgVector ArgValues(Args.size()); | ||||||
5399 | if (!EvaluateArgs(Args, ArgValues, Info, Callee)) | ||||||
5400 | return false; | ||||||
5401 | |||||||
5402 | if (!Info.CheckCallLimit(CallLoc)) | ||||||
5403 | return false; | ||||||
5404 | |||||||
5405 | CallStackFrame Frame(Info, CallLoc, Callee, This, ArgValues.data()); | ||||||
5406 | |||||||
5407 | // For a trivial copy or move assignment, perform an APValue copy. This is | ||||||
5408 | // essential for unions, where the operations performed by the assignment | ||||||
5409 | // operator cannot be represented as statements. | ||||||
5410 | // | ||||||
5411 | // Skip this for non-union classes with no fields; in that case, the defaulted | ||||||
5412 | // copy/move does not actually read the object. | ||||||
5413 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Callee); | ||||||
5414 | if (MD
| ||||||
5415 | (MD->getParent()->isUnion() || | ||||||
5416 | (MD->isTrivial() && hasFields(MD->getParent())))) { | ||||||
5417 | assert
isMoveAssignmentOperator())) ? static_cast<void> (0) : __assert_fail ("This && (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5418, __PRETTY_FUNCTION__)) | ||||||
5418 | (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator()))((This && (MD->isCopyAssignmentOperator() || MD-> isMoveAssignmentOperator())) ? static_cast<void> (0) : __assert_fail ("This && (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5418, __PRETTY_FUNCTION__)); | ||||||
5419 | LValue RHS; | ||||||
5420 | RHS.setFrom(Info.Ctx, ArgValues[0]); | ||||||
5421 | APValue RHSValue; | ||||||
5422 | if (!handleLValueToRValueConversion(Info, Args[0], Args[0]->getType(), RHS, | ||||||
5423 | RHSValue, MD->getParent()->isUnion())) | ||||||
5424 | return false; | ||||||
5425 | if (Info.getLangOpts().CPlusPlus2a && MD->isTrivial() && | ||||||
5426 | !HandleUnionActiveMemberChange(Info, Args[0], *This)) | ||||||
5427 | return false; | ||||||
5428 | if (!handleAssignment(Info, Args[0], *This, MD->getThisType(), | ||||||
5429 | RHSValue)) | ||||||
5430 | return false; | ||||||
5431 | This->moveInto(Result); | ||||||
5432 | return true; | ||||||
5433 | } else if (MD && isLambdaCallOperator(MD)) { | ||||||
5434 | // We're in a lambda; determine the lambda capture field maps unless we're | ||||||
5435 | // just constexpr checking a lambda's call operator. constexpr checking is | ||||||
5436 | // done before the captures have been added to the closure object (unless | ||||||
5437 | // we're inferring constexpr-ness), so we don't have access to them in this | ||||||
5438 | // case. But since we don't need the captures to constexpr check, we can | ||||||
5439 | // just ignore them. | ||||||
5440 | if (!Info.checkingPotentialConstantExpression()) | ||||||
5441 | MD->getParent()->getCaptureFields(Frame.LambdaCaptureFields, | ||||||
5442 | Frame.LambdaThisCaptureField); | ||||||
5443 | } | ||||||
5444 | |||||||
5445 | StmtResult Ret = {Result, ResultSlot}; | ||||||
5446 | EvalStmtResult ESR = EvaluateStmt(Ret, Info, Body); | ||||||
5447 | if (ESR == ESR_Succeeded) { | ||||||
5448 | if (Callee->getReturnType()->isVoidType()) | ||||||
5449 | return true; | ||||||
5450 | Info.FFDiag(Callee->getEndLoc(), diag::note_constexpr_no_return); | ||||||
5451 | } | ||||||
5452 | return ESR == ESR_Returned; | ||||||
5453 | } | ||||||
5454 | |||||||
5455 | /// Evaluate a constructor call. | ||||||
5456 | static bool HandleConstructorCall(const Expr *E, const LValue &This, | ||||||
5457 | APValue *ArgValues, | ||||||
5458 | const CXXConstructorDecl *Definition, | ||||||
5459 | EvalInfo &Info, APValue &Result) { | ||||||
5460 | SourceLocation CallLoc = E->getExprLoc(); | ||||||
5461 | if (!Info.CheckCallLimit(CallLoc)) | ||||||
5462 | return false; | ||||||
5463 | |||||||
5464 | const CXXRecordDecl *RD = Definition->getParent(); | ||||||
5465 | if (RD->getNumVBases()) { | ||||||
5466 | Info.FFDiag(CallLoc, diag::note_constexpr_virtual_base) << RD; | ||||||
5467 | return false; | ||||||
5468 | } | ||||||
5469 | |||||||
5470 | EvalInfo::EvaluatingConstructorRAII EvalObj( | ||||||
5471 | Info, | ||||||
5472 | ObjectUnderConstruction{This.getLValueBase(), This.Designator.Entries}, | ||||||
5473 | RD->getNumBases()); | ||||||
5474 | CallStackFrame Frame(Info, CallLoc, Definition, &This, ArgValues); | ||||||
5475 | |||||||
5476 | // FIXME: Creating an APValue just to hold a nonexistent return value is | ||||||
5477 | // wasteful. | ||||||
5478 | APValue RetVal; | ||||||
5479 | StmtResult Ret = {RetVal, nullptr}; | ||||||
5480 | |||||||
5481 | // If it's a delegating constructor, delegate. | ||||||
5482 | if (Definition->isDelegatingConstructor()) { | ||||||
5483 | CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); | ||||||
5484 | { | ||||||
5485 | FullExpressionRAII InitScope(Info); | ||||||
5486 | if (!EvaluateInPlace(Result, Info, This, (*I)->getInit()) || | ||||||
5487 | !InitScope.destroy()) | ||||||
5488 | return false; | ||||||
5489 | } | ||||||
5490 | return EvaluateStmt(Ret, Info, Definition->getBody()) != ESR_Failed; | ||||||
5491 | } | ||||||
5492 | |||||||
5493 | // For a trivial copy or move constructor, perform an APValue copy. This is | ||||||
5494 | // essential for unions (or classes with anonymous union members), where the | ||||||
5495 | // operations performed by the constructor cannot be represented by | ||||||
5496 | // ctor-initializers. | ||||||
5497 | // | ||||||
5498 | // Skip this for empty non-union classes; we should not perform an | ||||||
5499 | // lvalue-to-rvalue conversion on them because their copy constructor does not | ||||||
5500 | // actually read them. | ||||||
5501 | if (Definition->isDefaulted() && Definition->isCopyOrMoveConstructor() && | ||||||
5502 | (Definition->getParent()->isUnion() || | ||||||
5503 | (Definition->isTrivial() && hasFields(Definition->getParent())))) { | ||||||
5504 | LValue RHS; | ||||||
5505 | RHS.setFrom(Info.Ctx, ArgValues[0]); | ||||||
5506 | return handleLValueToRValueConversion( | ||||||
5507 | Info, E, Definition->getParamDecl(0)->getType().getNonReferenceType(), | ||||||
5508 | RHS, Result, Definition->getParent()->isUnion()); | ||||||
5509 | } | ||||||
5510 | |||||||
5511 | // Reserve space for the struct members. | ||||||
5512 | if (!RD->isUnion() && !Result.hasValue()) | ||||||
5513 | Result = APValue(APValue::UninitStruct(), RD->getNumBases(), | ||||||
5514 | std::distance(RD->field_begin(), RD->field_end())); | ||||||
5515 | |||||||
5516 | if (RD->isInvalidDecl()) return false; | ||||||
5517 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | ||||||
5518 | |||||||
5519 | // A scope for temporaries lifetime-extended by reference members. | ||||||
5520 | BlockScopeRAII LifetimeExtendedScope(Info); | ||||||
5521 | |||||||
5522 | bool Success = true; | ||||||
5523 | unsigned BasesSeen = 0; | ||||||
5524 | #ifndef NDEBUG | ||||||
5525 | CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); | ||||||
5526 | #endif | ||||||
5527 | CXXRecordDecl::field_iterator FieldIt = RD->field_begin(); | ||||||
5528 | auto SkipToField = [&](FieldDecl *FD, bool Indirect) { | ||||||
5529 | // We might be initializing the same field again if this is an indirect | ||||||
5530 | // field initialization. | ||||||
5531 | if (FieldIt == RD->field_end() || | ||||||
5532 | FieldIt->getFieldIndex() > FD->getFieldIndex()) { | ||||||
5533 | assert(Indirect && "fields out of order?")((Indirect && "fields out of order?") ? static_cast< void> (0) : __assert_fail ("Indirect && \"fields out of order?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5533, __PRETTY_FUNCTION__)); | ||||||
5534 | return; | ||||||
5535 | } | ||||||
5536 | |||||||
5537 | // Default-initialize any fields with no explicit initializer. | ||||||
5538 | for (; !declaresSameEntity(*FieldIt, FD); ++FieldIt) { | ||||||
5539 | assert(FieldIt != RD->field_end() && "missing field?")((FieldIt != RD->field_end() && "missing field?") ? static_cast<void> (0) : __assert_fail ("FieldIt != RD->field_end() && \"missing field?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5539, __PRETTY_FUNCTION__)); | ||||||
5540 | if (!FieldIt->isUnnamedBitfield()) | ||||||
5541 | Result.getStructField(FieldIt->getFieldIndex()) = | ||||||
5542 | getDefaultInitValue(FieldIt->getType()); | ||||||
5543 | } | ||||||
5544 | ++FieldIt; | ||||||
5545 | }; | ||||||
5546 | for (const auto *I : Definition->inits()) { | ||||||
5547 | LValue Subobject = This; | ||||||
5548 | LValue SubobjectParent = This; | ||||||
5549 | APValue *Value = &Result; | ||||||
5550 | |||||||
5551 | // Determine the subobject to initialize. | ||||||
5552 | FieldDecl *FD = nullptr; | ||||||
5553 | if (I->isBaseInitializer()) { | ||||||
5554 | QualType BaseType(I->getBaseClass(), 0); | ||||||
5555 | #ifndef NDEBUG | ||||||
5556 | // Non-virtual base classes are initialized in the order in the class | ||||||
5557 | // definition. We have already checked for virtual base classes. | ||||||
5558 | assert(!BaseIt->isVirtual() && "virtual base for literal type")((!BaseIt->isVirtual() && "virtual base for literal type" ) ? static_cast<void> (0) : __assert_fail ("!BaseIt->isVirtual() && \"virtual base for literal type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5558, __PRETTY_FUNCTION__)); | ||||||
5559 | assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) &&((Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && "base class initializers not in expected order") ? static_cast <void> (0) : __assert_fail ("Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && \"base class initializers not in expected order\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5560, __PRETTY_FUNCTION__)) | ||||||
5560 | "base class initializers not in expected order")((Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && "base class initializers not in expected order") ? static_cast <void> (0) : __assert_fail ("Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && \"base class initializers not in expected order\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5560, __PRETTY_FUNCTION__)); | ||||||
5561 | ++BaseIt; | ||||||
5562 | #endif | ||||||
5563 | if (!HandleLValueDirectBase(Info, I->getInit(), Subobject, RD, | ||||||
5564 | BaseType->getAsCXXRecordDecl(), &Layout)) | ||||||
5565 | return false; | ||||||
5566 | Value = &Result.getStructBase(BasesSeen++); | ||||||
5567 | } else if ((FD = I->getMember())) { | ||||||
5568 | if (!HandleLValueMember(Info, I->getInit(), Subobject, FD, &Layout)) | ||||||
5569 | return false; | ||||||
5570 | if (RD->isUnion()) { | ||||||
5571 | Result = APValue(FD); | ||||||
5572 | Value = &Result.getUnionValue(); | ||||||
5573 | } else { | ||||||
5574 | SkipToField(FD, false); | ||||||
5575 | Value = &Result.getStructField(FD->getFieldIndex()); | ||||||
5576 | } | ||||||
5577 | } else if (IndirectFieldDecl *IFD = I->getIndirectMember()) { | ||||||
5578 | // Walk the indirect field decl's chain to find the object to initialize, | ||||||
5579 | // and make sure we've initialized every step along it. | ||||||
5580 | auto IndirectFieldChain = IFD->chain(); | ||||||
5581 | for (auto *C : IndirectFieldChain) { | ||||||
5582 | FD = cast<FieldDecl>(C); | ||||||
5583 | CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); | ||||||
5584 | // Switch the union field if it differs. This happens if we had | ||||||
5585 | // preceding zero-initialization, and we're now initializing a union | ||||||
5586 | // subobject other than the first. | ||||||
5587 | // FIXME: In this case, the values of the other subobjects are | ||||||
5588 | // specified, since zero-initialization sets all padding bits to zero. | ||||||
5589 | if (!Value->hasValue() || | ||||||
5590 | (Value->isUnion() && Value->getUnionField() != FD)) { | ||||||
5591 | if (CD->isUnion()) | ||||||
5592 | *Value = APValue(FD); | ||||||
5593 | else | ||||||
5594 | // FIXME: This immediately starts the lifetime of all members of an | ||||||
5595 | // anonymous struct. It would be preferable to strictly start member | ||||||
5596 | // lifetime in initialization order. | ||||||
5597 | *Value = getDefaultInitValue(Info.Ctx.getRecordType(CD)); | ||||||
5598 | } | ||||||
5599 | // Store Subobject as its parent before updating it for the last element | ||||||
5600 | // in the chain. | ||||||
5601 | if (C == IndirectFieldChain.back()) | ||||||
5602 | SubobjectParent = Subobject; | ||||||
5603 | if (!HandleLValueMember(Info, I->getInit(), Subobject, FD)) | ||||||
5604 | return false; | ||||||
5605 | if (CD->isUnion()) | ||||||
5606 | Value = &Value->getUnionValue(); | ||||||
5607 | else { | ||||||
5608 | if (C == IndirectFieldChain.front() && !RD->isUnion()) | ||||||
5609 | SkipToField(FD, true); | ||||||
5610 | Value = &Value->getStructField(FD->getFieldIndex()); | ||||||
5611 | } | ||||||
5612 | } | ||||||
5613 | } else { | ||||||
5614 | llvm_unreachable("unknown base initializer kind")::llvm::llvm_unreachable_internal("unknown base initializer kind" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5614); | ||||||
5615 | } | ||||||
5616 | |||||||
5617 | // Need to override This for implicit field initializers as in this case | ||||||
5618 | // This refers to innermost anonymous struct/union containing initializer, | ||||||
5619 | // not to currently constructed class. | ||||||
5620 | const Expr *Init = I->getInit(); | ||||||
5621 | ThisOverrideRAII ThisOverride(*Info.CurrentCall, &SubobjectParent, | ||||||
5622 | isa<CXXDefaultInitExpr>(Init)); | ||||||
5623 | FullExpressionRAII InitScope(Info); | ||||||
5624 | if (!EvaluateInPlace(*Value, Info, Subobject, Init) || | ||||||
5625 | (FD && FD->isBitField() && | ||||||
5626 | !truncateBitfieldValue(Info, Init, *Value, FD))) { | ||||||
5627 | // If we're checking for a potential constant expression, evaluate all | ||||||
5628 | // initializers even if some of them fail. | ||||||
5629 | if (!Info.noteFailure()) | ||||||
5630 | return false; | ||||||
5631 | Success = false; | ||||||
5632 | } | ||||||
5633 | |||||||
5634 | // This is the point at which the dynamic type of the object becomes this | ||||||
5635 | // class type. | ||||||
5636 | if (I->isBaseInitializer() && BasesSeen == RD->getNumBases()) | ||||||
5637 | EvalObj.finishedConstructingBases(); | ||||||
5638 | } | ||||||
5639 | |||||||
5640 | // Default-initialize any remaining fields. | ||||||
5641 | if (!RD->isUnion()) { | ||||||
5642 | for (; FieldIt != RD->field_end(); ++FieldIt) { | ||||||
5643 | if (!FieldIt->isUnnamedBitfield()) | ||||||
5644 | Result.getStructField(FieldIt->getFieldIndex()) = | ||||||
5645 | getDefaultInitValue(FieldIt->getType()); | ||||||
5646 | } | ||||||
5647 | } | ||||||
5648 | |||||||
5649 | return Success && | ||||||
5650 | EvaluateStmt(Ret, Info, Definition->getBody()) != ESR_Failed && | ||||||
5651 | LifetimeExtendedScope.destroy(); | ||||||
5652 | } | ||||||
5653 | |||||||
5654 | static bool HandleConstructorCall(const Expr *E, const LValue &This, | ||||||
5655 | ArrayRef<const Expr*> Args, | ||||||
5656 | const CXXConstructorDecl *Definition, | ||||||
5657 | EvalInfo &Info, APValue &Result) { | ||||||
5658 | ArgVector ArgValues(Args.size()); | ||||||
5659 | if (!EvaluateArgs(Args, ArgValues, Info, Definition)) | ||||||
5660 | return false; | ||||||
5661 | |||||||
5662 | return HandleConstructorCall(E, This, ArgValues.data(), Definition, | ||||||
5663 | Info, Result); | ||||||
5664 | } | ||||||
5665 | |||||||
5666 | static bool HandleDestructionImpl(EvalInfo &Info, SourceLocation CallLoc, | ||||||
5667 | const LValue &This, APValue &Value, | ||||||
5668 | QualType T) { | ||||||
5669 | // Objects can only be destroyed while they're within their lifetimes. | ||||||
5670 | // FIXME: We have no representation for whether an object of type nullptr_t | ||||||
5671 | // is in its lifetime; it usually doesn't matter. Perhaps we should model it | ||||||
5672 | // as indeterminate instead? | ||||||
5673 | if (Value.isAbsent() && !T->isNullPtrType()) { | ||||||
5674 | APValue Printable; | ||||||
5675 | This.moveInto(Printable); | ||||||
5676 | Info.FFDiag(CallLoc, diag::note_constexpr_destroy_out_of_lifetime) | ||||||
5677 | << Printable.getAsString(Info.Ctx, Info.Ctx.getLValueReferenceType(T)); | ||||||
5678 | return false; | ||||||
5679 | } | ||||||
5680 | |||||||
5681 | // Invent an expression for location purposes. | ||||||
5682 | // FIXME: We shouldn't need to do this. | ||||||
5683 | OpaqueValueExpr LocE(CallLoc, Info.Ctx.IntTy, VK_RValue); | ||||||
5684 | |||||||
5685 | // For arrays, destroy elements right-to-left. | ||||||
5686 | if (const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(T)) { | ||||||
5687 | uint64_t Size = CAT->getSize().getZExtValue(); | ||||||
5688 | QualType ElemT = CAT->getElementType(); | ||||||
5689 | |||||||
5690 | LValue ElemLV = This; | ||||||
5691 | ElemLV.addArray(Info, &LocE, CAT); | ||||||
5692 | if (!HandleLValueArrayAdjustment(Info, &LocE, ElemLV, ElemT, Size)) | ||||||
5693 | return false; | ||||||
5694 | |||||||
5695 | // Ensure that we have actual array elements available to destroy; the | ||||||
5696 | // destructors might mutate the value, so we can't run them on the array | ||||||
5697 | // filler. | ||||||
5698 | if (Size && Size > Value.getArrayInitializedElts()) | ||||||
5699 | expandArray(Value, Value.getArraySize() - 1); | ||||||
5700 | |||||||
5701 | for (; Size != 0; --Size) { | ||||||
5702 | APValue &Elem = Value.getArrayInitializedElt(Size - 1); | ||||||
5703 | if (!HandleLValueArrayAdjustment(Info, &LocE, ElemLV, ElemT, -1) || | ||||||
5704 | !HandleDestructionImpl(Info, CallLoc, ElemLV, Elem, ElemT)) | ||||||
5705 | return false; | ||||||
5706 | } | ||||||
5707 | |||||||
5708 | // End the lifetime of this array now. | ||||||
5709 | Value = APValue(); | ||||||
5710 | return true; | ||||||
5711 | } | ||||||
5712 | |||||||
5713 | const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); | ||||||
5714 | if (!RD) { | ||||||
5715 | if (T.isDestructedType()) { | ||||||
5716 | Info.FFDiag(CallLoc, diag::note_constexpr_unsupported_destruction) << T; | ||||||
5717 | return false; | ||||||
5718 | } | ||||||
5719 | |||||||
5720 | Value = APValue(); | ||||||
5721 | return true; | ||||||
5722 | } | ||||||
5723 | |||||||
5724 | if (RD->getNumVBases()) { | ||||||
5725 | Info.FFDiag(CallLoc, diag::note_constexpr_virtual_base) << RD; | ||||||
5726 | return false; | ||||||
5727 | } | ||||||
5728 | |||||||
5729 | const CXXDestructorDecl *DD = RD->getDestructor(); | ||||||
5730 | if (!DD && !RD->hasTrivialDestructor()) { | ||||||
5731 | Info.FFDiag(CallLoc); | ||||||
5732 | return false; | ||||||
5733 | } | ||||||
5734 | |||||||
5735 | if (!DD || DD->isTrivial() || | ||||||
5736 | (RD->isAnonymousStructOrUnion() && RD->isUnion())) { | ||||||
5737 | // A trivial destructor just ends the lifetime of the object. Check for | ||||||
5738 | // this case before checking for a body, because we might not bother | ||||||
5739 | // building a body for a trivial destructor. Note that it doesn't matter | ||||||
5740 | // whether the destructor is constexpr in this case; all trivial | ||||||
5741 | // destructors are constexpr. | ||||||
5742 | // | ||||||
5743 | // If an anonymous union would be destroyed, some enclosing destructor must | ||||||
5744 | // have been explicitly defined, and the anonymous union destruction should | ||||||
5745 | // have no effect. | ||||||
5746 | Value = APValue(); | ||||||
5747 | return true; | ||||||
5748 | } | ||||||
5749 | |||||||
5750 | if (!Info.CheckCallLimit(CallLoc)) | ||||||
5751 | return false; | ||||||
5752 | |||||||
5753 | const FunctionDecl *Definition = nullptr; | ||||||
5754 | const Stmt *Body = DD->getBody(Definition); | ||||||
5755 | |||||||
5756 | if (!CheckConstexprFunction(Info, CallLoc, DD, Definition, Body)) | ||||||
5757 | return false; | ||||||
5758 | |||||||
5759 | CallStackFrame Frame(Info, CallLoc, Definition, &This, nullptr); | ||||||
5760 | |||||||
5761 | // We're now in the period of destruction of this object. | ||||||
5762 | unsigned BasesLeft = RD->getNumBases(); | ||||||
5763 | EvalInfo::EvaluatingDestructorRAII EvalObj( | ||||||
5764 | Info, | ||||||
5765 | ObjectUnderConstruction{This.getLValueBase(), This.Designator.Entries}); | ||||||
5766 | if (!EvalObj.DidInsert) { | ||||||
5767 | // C++2a [class.dtor]p19: | ||||||
5768 | // the behavior is undefined if the destructor is invoked for an object | ||||||
5769 | // whose lifetime has ended | ||||||
5770 | // (Note that formally the lifetime ends when the period of destruction | ||||||
5771 | // begins, even though certain uses of the object remain valid until the | ||||||
5772 | // period of destruction ends.) | ||||||
5773 | Info.FFDiag(CallLoc, diag::note_constexpr_double_destroy); | ||||||
5774 | return false; | ||||||
5775 | } | ||||||
5776 | |||||||
5777 | // FIXME: Creating an APValue just to hold a nonexistent return value is | ||||||
5778 | // wasteful. | ||||||
5779 | APValue RetVal; | ||||||
5780 | StmtResult Ret = {RetVal, nullptr}; | ||||||
5781 | if (EvaluateStmt(Ret, Info, Definition->getBody()) == ESR_Failed) | ||||||
5782 | return false; | ||||||
5783 | |||||||
5784 | // A union destructor does not implicitly destroy its members. | ||||||
5785 | if (RD->isUnion()) | ||||||
5786 | return true; | ||||||
5787 | |||||||
5788 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | ||||||
5789 | |||||||
5790 | // We don't have a good way to iterate fields in reverse, so collect all the | ||||||
5791 | // fields first and then walk them backwards. | ||||||
5792 | SmallVector<FieldDecl*, 16> Fields(RD->field_begin(), RD->field_end()); | ||||||
5793 | for (const FieldDecl *FD : llvm::reverse(Fields)) { | ||||||
5794 | if (FD->isUnnamedBitfield()) | ||||||
5795 | continue; | ||||||
5796 | |||||||
5797 | LValue Subobject = This; | ||||||
5798 | if (!HandleLValueMember(Info, &LocE, Subobject, FD, &Layout)) | ||||||
5799 | return false; | ||||||
5800 | |||||||
5801 | APValue *SubobjectValue = &Value.getStructField(FD->getFieldIndex()); | ||||||
5802 | if (!HandleDestructionImpl(Info, CallLoc, Subobject, *SubobjectValue, | ||||||
5803 | FD->getType())) | ||||||
5804 | return false; | ||||||
5805 | } | ||||||
5806 | |||||||
5807 | if (BasesLeft != 0) | ||||||
5808 | EvalObj.startedDestroyingBases(); | ||||||
5809 | |||||||
5810 | // Destroy base classes in reverse order. | ||||||
5811 | for (const CXXBaseSpecifier &Base : llvm::reverse(RD->bases())) { | ||||||
5812 | --BasesLeft; | ||||||
5813 | |||||||
5814 | QualType BaseType = Base.getType(); | ||||||
5815 | LValue Subobject = This; | ||||||
5816 | if (!HandleLValueDirectBase(Info, &LocE, Subobject, RD, | ||||||
5817 | BaseType->getAsCXXRecordDecl(), &Layout)) | ||||||
5818 | return false; | ||||||
5819 | |||||||
5820 | APValue *SubobjectValue = &Value.getStructBase(BasesLeft); | ||||||
5821 | if (!HandleDestructionImpl(Info, CallLoc, Subobject, *SubobjectValue, | ||||||
5822 | BaseType)) | ||||||
5823 | return false; | ||||||
5824 | } | ||||||
5825 | assert(BasesLeft == 0 && "NumBases was wrong?")((BasesLeft == 0 && "NumBases was wrong?") ? static_cast <void> (0) : __assert_fail ("BasesLeft == 0 && \"NumBases was wrong?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5825, __PRETTY_FUNCTION__)); | ||||||
5826 | |||||||
5827 | // The period of destruction ends now. The object is gone. | ||||||
5828 | Value = APValue(); | ||||||
5829 | return true; | ||||||
5830 | } | ||||||
5831 | |||||||
5832 | namespace { | ||||||
5833 | struct DestroyObjectHandler { | ||||||
5834 | EvalInfo &Info; | ||||||
5835 | const Expr *E; | ||||||
5836 | const LValue &This; | ||||||
5837 | const AccessKinds AccessKind; | ||||||
5838 | |||||||
5839 | typedef bool result_type; | ||||||
5840 | bool failed() { return false; } | ||||||
5841 | bool found(APValue &Subobj, QualType SubobjType) { | ||||||
5842 | return HandleDestructionImpl(Info, E->getExprLoc(), This, Subobj, | ||||||
5843 | SubobjType); | ||||||
5844 | } | ||||||
5845 | bool found(APSInt &Value, QualType SubobjType) { | ||||||
5846 | Info.FFDiag(E, diag::note_constexpr_destroy_complex_elem); | ||||||
5847 | return false; | ||||||
5848 | } | ||||||
5849 | bool found(APFloat &Value, QualType SubobjType) { | ||||||
5850 | Info.FFDiag(E, diag::note_constexpr_destroy_complex_elem); | ||||||
5851 | return false; | ||||||
5852 | } | ||||||
5853 | }; | ||||||
5854 | } | ||||||
5855 | |||||||
5856 | /// Perform a destructor or pseudo-destructor call on the given object, which | ||||||
5857 | /// might in general not be a complete object. | ||||||
5858 | static bool HandleDestruction(EvalInfo &Info, const Expr *E, | ||||||
5859 | const LValue &This, QualType ThisType) { | ||||||
5860 | CompleteObject Obj = findCompleteObject(Info, E, AK_Destroy, This, ThisType); | ||||||
5861 | DestroyObjectHandler Handler = {Info, E, This, AK_Destroy}; | ||||||
5862 | return Obj && findSubobject(Info, E, Obj, This.Designator, Handler); | ||||||
5863 | } | ||||||
5864 | |||||||
5865 | /// Destroy and end the lifetime of the given complete object. | ||||||
5866 | static bool HandleDestruction(EvalInfo &Info, SourceLocation Loc, | ||||||
5867 | APValue::LValueBase LVBase, APValue &Value, | ||||||
5868 | QualType T) { | ||||||
5869 | // If we've had an unmodeled side-effect, we can't rely on mutable state | ||||||
5870 | // (such as the object we're about to destroy) being correct. | ||||||
5871 | if (Info.EvalStatus.HasSideEffects) | ||||||
5872 | return false; | ||||||
5873 | |||||||
5874 | LValue LV; | ||||||
5875 | LV.set({LVBase}); | ||||||
5876 | return HandleDestructionImpl(Info, Loc, LV, Value, T); | ||||||
5877 | } | ||||||
5878 | |||||||
5879 | //===----------------------------------------------------------------------===// | ||||||
5880 | // Generic Evaluation | ||||||
5881 | //===----------------------------------------------------------------------===// | ||||||
5882 | namespace { | ||||||
5883 | |||||||
5884 | class BitCastBuffer { | ||||||
5885 | // FIXME: We're going to need bit-level granularity when we support | ||||||
5886 | // bit-fields. | ||||||
5887 | // FIXME: Its possible under the C++ standard for 'char' to not be 8 bits, but | ||||||
5888 | // we don't support a host or target where that is the case. Still, we should | ||||||
5889 | // use a more generic type in case we ever do. | ||||||
5890 | SmallVector<Optional<unsigned char>, 32> Bytes; | ||||||
5891 | |||||||
5892 | static_assert(std::numeric_limits<unsigned char>::digits >= 8, | ||||||
5893 | "Need at least 8 bit unsigned char"); | ||||||
5894 | |||||||
5895 | bool TargetIsLittleEndian; | ||||||
5896 | |||||||
5897 | public: | ||||||
5898 | BitCastBuffer(CharUnits Width, bool TargetIsLittleEndian) | ||||||
5899 | : Bytes(Width.getQuantity()), | ||||||
5900 | TargetIsLittleEndian(TargetIsLittleEndian) {} | ||||||
5901 | |||||||
5902 | LLVM_NODISCARD[[clang::warn_unused_result]] | ||||||
5903 | bool readObject(CharUnits Offset, CharUnits Width, | ||||||
5904 | SmallVectorImpl<unsigned char> &Output) const { | ||||||
5905 | for (CharUnits I = Offset, E = Offset + Width; I != E; ++I) { | ||||||
5906 | // If a byte of an integer is uninitialized, then the whole integer is | ||||||
5907 | // uninitalized. | ||||||
5908 | if (!Bytes[I.getQuantity()]) | ||||||
5909 | return false; | ||||||
5910 | Output.push_back(*Bytes[I.getQuantity()]); | ||||||
5911 | } | ||||||
5912 | if (llvm::sys::IsLittleEndianHost != TargetIsLittleEndian) | ||||||
5913 | std::reverse(Output.begin(), Output.end()); | ||||||
5914 | return true; | ||||||
5915 | } | ||||||
5916 | |||||||
5917 | void writeObject(CharUnits Offset, SmallVectorImpl<unsigned char> &Input) { | ||||||
5918 | if (llvm::sys::IsLittleEndianHost != TargetIsLittleEndian) | ||||||
5919 | std::reverse(Input.begin(), Input.end()); | ||||||
5920 | |||||||
5921 | size_t Index = 0; | ||||||
5922 | for (unsigned char Byte : Input) { | ||||||
5923 | assert(!Bytes[Offset.getQuantity() + Index] && "overwriting a byte?")((!Bytes[Offset.getQuantity() + Index] && "overwriting a byte?" ) ? static_cast<void> (0) : __assert_fail ("!Bytes[Offset.getQuantity() + Index] && \"overwriting a byte?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5923, __PRETTY_FUNCTION__)); | ||||||
5924 | Bytes[Offset.getQuantity() + Index] = Byte; | ||||||
5925 | ++Index; | ||||||
5926 | } | ||||||
5927 | } | ||||||
5928 | |||||||
5929 | size_t size() { return Bytes.size(); } | ||||||
5930 | }; | ||||||
5931 | |||||||
5932 | /// Traverse an APValue to produce an BitCastBuffer, emulating how the current | ||||||
5933 | /// target would represent the value at runtime. | ||||||
5934 | class APValueToBufferConverter { | ||||||
5935 | EvalInfo &Info; | ||||||
5936 | BitCastBuffer Buffer; | ||||||
5937 | const CastExpr *BCE; | ||||||
5938 | |||||||
5939 | APValueToBufferConverter(EvalInfo &Info, CharUnits ObjectWidth, | ||||||
5940 | const CastExpr *BCE) | ||||||
5941 | : Info(Info), | ||||||
5942 | Buffer(ObjectWidth, Info.Ctx.getTargetInfo().isLittleEndian()), | ||||||
5943 | BCE(BCE) {} | ||||||
5944 | |||||||
5945 | bool visit(const APValue &Val, QualType Ty) { | ||||||
5946 | return visit(Val, Ty, CharUnits::fromQuantity(0)); | ||||||
5947 | } | ||||||
5948 | |||||||
5949 | // Write out Val with type Ty into Buffer starting at Offset. | ||||||
5950 | bool visit(const APValue &Val, QualType Ty, CharUnits Offset) { | ||||||
5951 | assert((size_t)Offset.getQuantity() <= Buffer.size())(((size_t)Offset.getQuantity() <= Buffer.size()) ? static_cast <void> (0) : __assert_fail ("(size_t)Offset.getQuantity() <= Buffer.size()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5951, __PRETTY_FUNCTION__)); | ||||||
5952 | |||||||
5953 | // As a special case, nullptr_t has an indeterminate value. | ||||||
5954 | if (Ty->isNullPtrType()) | ||||||
5955 | return true; | ||||||
5956 | |||||||
5957 | // Dig through Src to find the byte at SrcOffset. | ||||||
5958 | switch (Val.getKind()) { | ||||||
5959 | case APValue::Indeterminate: | ||||||
5960 | case APValue::None: | ||||||
5961 | return true; | ||||||
5962 | |||||||
5963 | case APValue::Int: | ||||||
5964 | return visitInt(Val.getInt(), Ty, Offset); | ||||||
5965 | case APValue::Float: | ||||||
5966 | return visitFloat(Val.getFloat(), Ty, Offset); | ||||||
5967 | case APValue::Array: | ||||||
5968 | return visitArray(Val, Ty, Offset); | ||||||
5969 | case APValue::Struct: | ||||||
5970 | return visitRecord(Val, Ty, Offset); | ||||||
5971 | |||||||
5972 | case APValue::ComplexInt: | ||||||
5973 | case APValue::ComplexFloat: | ||||||
5974 | case APValue::Vector: | ||||||
5975 | case APValue::FixedPoint: | ||||||
5976 | // FIXME: We should support these. | ||||||
5977 | |||||||
5978 | case APValue::Union: | ||||||
5979 | case APValue::MemberPointer: | ||||||
5980 | case APValue::AddrLabelDiff: { | ||||||
5981 | Info.FFDiag(BCE->getBeginLoc(), | ||||||
5982 | diag::note_constexpr_bit_cast_unsupported_type) | ||||||
5983 | << Ty; | ||||||
5984 | return false; | ||||||
5985 | } | ||||||
5986 | |||||||
5987 | case APValue::LValue: | ||||||
5988 | llvm_unreachable("LValue subobject in bit_cast?")::llvm::llvm_unreachable_internal("LValue subobject in bit_cast?" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5988); | ||||||
5989 | } | ||||||
5990 | llvm_unreachable("Unhandled APValue::ValueKind")::llvm::llvm_unreachable_internal("Unhandled APValue::ValueKind" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 5990); | ||||||
5991 | } | ||||||
5992 | |||||||
5993 | bool visitRecord(const APValue &Val, QualType Ty, CharUnits Offset) { | ||||||
5994 | const RecordDecl *RD = Ty->getAsRecordDecl(); | ||||||
5995 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | ||||||
5996 | |||||||
5997 | // Visit the base classes. | ||||||
5998 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) { | ||||||
5999 | for (size_t I = 0, E = CXXRD->getNumBases(); I != E; ++I) { | ||||||
6000 | const CXXBaseSpecifier &BS = CXXRD->bases_begin()[I]; | ||||||
6001 | CXXRecordDecl *BaseDecl = BS.getType()->getAsCXXRecordDecl(); | ||||||
6002 | |||||||
6003 | if (!visitRecord(Val.getStructBase(I), BS.getType(), | ||||||
6004 | Layout.getBaseClassOffset(BaseDecl) + Offset)) | ||||||
6005 | return false; | ||||||
6006 | } | ||||||
6007 | } | ||||||
6008 | |||||||
6009 | // Visit the fields. | ||||||
6010 | unsigned FieldIdx = 0; | ||||||
6011 | for (FieldDecl *FD : RD->fields()) { | ||||||
6012 | if (FD->isBitField()) { | ||||||
6013 | Info.FFDiag(BCE->getBeginLoc(), | ||||||
6014 | diag::note_constexpr_bit_cast_unsupported_bitfield); | ||||||
6015 | return false; | ||||||
6016 | } | ||||||
6017 | |||||||
6018 | uint64_t FieldOffsetBits = Layout.getFieldOffset(FieldIdx); | ||||||
6019 | |||||||
6020 | assert(FieldOffsetBits % Info.Ctx.getCharWidth() == 0 &&((FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && "only bit-fields can have sub-char alignment" ) ? static_cast<void> (0) : __assert_fail ("FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && \"only bit-fields can have sub-char alignment\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6021, __PRETTY_FUNCTION__)) | ||||||
6021 | "only bit-fields can have sub-char alignment")((FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && "only bit-fields can have sub-char alignment" ) ? static_cast<void> (0) : __assert_fail ("FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && \"only bit-fields can have sub-char alignment\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6021, __PRETTY_FUNCTION__)); | ||||||
6022 | CharUnits FieldOffset = | ||||||
6023 | Info.Ctx.toCharUnitsFromBits(FieldOffsetBits) + Offset; | ||||||
6024 | QualType FieldTy = FD->getType(); | ||||||
6025 | if (!visit(Val.getStructField(FieldIdx), FieldTy, FieldOffset)) | ||||||
6026 | return false; | ||||||
6027 | ++FieldIdx; | ||||||
6028 | } | ||||||
6029 | |||||||
6030 | return true; | ||||||
6031 | } | ||||||
6032 | |||||||
6033 | bool visitArray(const APValue &Val, QualType Ty, CharUnits Offset) { | ||||||
6034 | const auto *CAT = | ||||||
6035 | dyn_cast_or_null<ConstantArrayType>(Ty->getAsArrayTypeUnsafe()); | ||||||
6036 | if (!CAT) | ||||||
6037 | return false; | ||||||
6038 | |||||||
6039 | CharUnits ElemWidth = Info.Ctx.getTypeSizeInChars(CAT->getElementType()); | ||||||
6040 | unsigned NumInitializedElts = Val.getArrayInitializedElts(); | ||||||
6041 | unsigned ArraySize = Val.getArraySize(); | ||||||
6042 | // First, initialize the initialized elements. | ||||||
6043 | for (unsigned I = 0; I != NumInitializedElts; ++I) { | ||||||
6044 | const APValue &SubObj = Val.getArrayInitializedElt(I); | ||||||
6045 | if (!visit(SubObj, CAT->getElementType(), Offset + I * ElemWidth)) | ||||||
6046 | return false; | ||||||
6047 | } | ||||||
6048 | |||||||
6049 | // Next, initialize the rest of the array using the filler. | ||||||
6050 | if (Val.hasArrayFiller()) { | ||||||
6051 | const APValue &Filler = Val.getArrayFiller(); | ||||||
6052 | for (unsigned I = NumInitializedElts; I != ArraySize; ++I) { | ||||||
6053 | if (!visit(Filler, CAT->getElementType(), Offset + I * ElemWidth)) | ||||||
6054 | return false; | ||||||
6055 | } | ||||||
6056 | } | ||||||
6057 | |||||||
6058 | return true; | ||||||
6059 | } | ||||||
6060 | |||||||
6061 | bool visitInt(const APSInt &Val, QualType Ty, CharUnits Offset) { | ||||||
6062 | CharUnits Width = Info.Ctx.getTypeSizeInChars(Ty); | ||||||
6063 | SmallVector<unsigned char, 8> Bytes(Width.getQuantity()); | ||||||
6064 | llvm::StoreIntToMemory(Val, &*Bytes.begin(), Width.getQuantity()); | ||||||
6065 | Buffer.writeObject(Offset, Bytes); | ||||||
6066 | return true; | ||||||
6067 | } | ||||||
6068 | |||||||
6069 | bool visitFloat(const APFloat &Val, QualType Ty, CharUnits Offset) { | ||||||
6070 | APSInt AsInt(Val.bitcastToAPInt()); | ||||||
6071 | return visitInt(AsInt, Ty, Offset); | ||||||
6072 | } | ||||||
6073 | |||||||
6074 | public: | ||||||
6075 | static Optional<BitCastBuffer> convert(EvalInfo &Info, const APValue &Src, | ||||||
6076 | const CastExpr *BCE) { | ||||||
6077 | CharUnits DstSize = Info.Ctx.getTypeSizeInChars(BCE->getType()); | ||||||
6078 | APValueToBufferConverter Converter(Info, DstSize, BCE); | ||||||
6079 | if (!Converter.visit(Src, BCE->getSubExpr()->getType())) | ||||||
6080 | return None; | ||||||
6081 | return Converter.Buffer; | ||||||
6082 | } | ||||||
6083 | }; | ||||||
6084 | |||||||
6085 | /// Write an BitCastBuffer into an APValue. | ||||||
6086 | class BufferToAPValueConverter { | ||||||
6087 | EvalInfo &Info; | ||||||
6088 | const BitCastBuffer &Buffer; | ||||||
6089 | const CastExpr *BCE; | ||||||
6090 | |||||||
6091 | BufferToAPValueConverter(EvalInfo &Info, const BitCastBuffer &Buffer, | ||||||
6092 | const CastExpr *BCE) | ||||||
6093 | : Info(Info), Buffer(Buffer), BCE(BCE) {} | ||||||
6094 | |||||||
6095 | // Emit an unsupported bit_cast type error. Sema refuses to build a bit_cast | ||||||
6096 | // with an invalid type, so anything left is a deficiency on our part (FIXME). | ||||||
6097 | // Ideally this will be unreachable. | ||||||
6098 | llvm::NoneType unsupportedType(QualType Ty) { | ||||||
6099 | Info.FFDiag(BCE->getBeginLoc(), | ||||||
6100 | diag::note_constexpr_bit_cast_unsupported_type) | ||||||
6101 | << Ty; | ||||||
6102 | return None; | ||||||
6103 | } | ||||||
6104 | |||||||
6105 | Optional<APValue> visit(const BuiltinType *T, CharUnits Offset, | ||||||
6106 | const EnumType *EnumSugar = nullptr) { | ||||||
6107 | if (T->isNullPtrType()) { | ||||||
6108 | uint64_t NullValue = Info.Ctx.getTargetNullPointerValue(QualType(T, 0)); | ||||||
6109 | return APValue((Expr *)nullptr, | ||||||
6110 | /*Offset=*/CharUnits::fromQuantity(NullValue), | ||||||
6111 | APValue::NoLValuePath{}, /*IsNullPtr=*/true); | ||||||
6112 | } | ||||||
6113 | |||||||
6114 | CharUnits SizeOf = Info.Ctx.getTypeSizeInChars(T); | ||||||
6115 | SmallVector<uint8_t, 8> Bytes; | ||||||
6116 | if (!Buffer.readObject(Offset, SizeOf, Bytes)) { | ||||||
6117 | // If this is std::byte or unsigned char, then its okay to store an | ||||||
6118 | // indeterminate value. | ||||||
6119 | bool IsStdByte = EnumSugar && EnumSugar->isStdByteType(); | ||||||
6120 | bool IsUChar = | ||||||
6121 | !EnumSugar && (T->isSpecificBuiltinType(BuiltinType::UChar) || | ||||||
6122 | T->isSpecificBuiltinType(BuiltinType::Char_U)); | ||||||
6123 | if (!IsStdByte && !IsUChar) { | ||||||
6124 | QualType DisplayType(EnumSugar ? (const Type *)EnumSugar : T, 0); | ||||||
6125 | Info.FFDiag(BCE->getExprLoc(), | ||||||
6126 | diag::note_constexpr_bit_cast_indet_dest) | ||||||
6127 | << DisplayType << Info.Ctx.getLangOpts().CharIsSigned; | ||||||
6128 | return None; | ||||||
6129 | } | ||||||
6130 | |||||||
6131 | return APValue::IndeterminateValue(); | ||||||
6132 | } | ||||||
6133 | |||||||
6134 | APSInt Val(SizeOf.getQuantity() * Info.Ctx.getCharWidth(), true); | ||||||
6135 | llvm::LoadIntFromMemory(Val, &*Bytes.begin(), Bytes.size()); | ||||||
6136 | |||||||
6137 | if (T->isIntegralOrEnumerationType()) { | ||||||
6138 | Val.setIsSigned(T->isSignedIntegerOrEnumerationType()); | ||||||
6139 | return APValue(Val); | ||||||
6140 | } | ||||||
6141 | |||||||
6142 | if (T->isRealFloatingType()) { | ||||||
6143 | const llvm::fltSemantics &Semantics = | ||||||
6144 | Info.Ctx.getFloatTypeSemantics(QualType(T, 0)); | ||||||
6145 | return APValue(APFloat(Semantics, Val)); | ||||||
6146 | } | ||||||
6147 | |||||||
6148 | return unsupportedType(QualType(T, 0)); | ||||||
6149 | } | ||||||
6150 | |||||||
6151 | Optional<APValue> visit(const RecordType *RTy, CharUnits Offset) { | ||||||
6152 | const RecordDecl *RD = RTy->getAsRecordDecl(); | ||||||
6153 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | ||||||
6154 | |||||||
6155 | unsigned NumBases = 0; | ||||||
6156 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) | ||||||
6157 | NumBases = CXXRD->getNumBases(); | ||||||
6158 | |||||||
6159 | APValue ResultVal(APValue::UninitStruct(), NumBases, | ||||||
6160 | std::distance(RD->field_begin(), RD->field_end())); | ||||||
6161 | |||||||
6162 | // Visit the base classes. | ||||||
6163 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) { | ||||||
6164 | for (size_t I = 0, E = CXXRD->getNumBases(); I != E; ++I) { | ||||||
6165 | const CXXBaseSpecifier &BS = CXXRD->bases_begin()[I]; | ||||||
6166 | CXXRecordDecl *BaseDecl = BS.getType()->getAsCXXRecordDecl(); | ||||||
6167 | if (BaseDecl->isEmpty() || | ||||||
6168 | Info.Ctx.getASTRecordLayout(BaseDecl).getNonVirtualSize().isZero()) | ||||||
6169 | continue; | ||||||
6170 | |||||||
6171 | Optional<APValue> SubObj = visitType( | ||||||
6172 | BS.getType(), Layout.getBaseClassOffset(BaseDecl) + Offset); | ||||||
6173 | if (!SubObj) | ||||||
6174 | return None; | ||||||
6175 | ResultVal.getStructBase(I) = *SubObj; | ||||||
6176 | } | ||||||
6177 | } | ||||||
6178 | |||||||
6179 | // Visit the fields. | ||||||
6180 | unsigned FieldIdx = 0; | ||||||
6181 | for (FieldDecl *FD : RD->fields()) { | ||||||
6182 | // FIXME: We don't currently support bit-fields. A lot of the logic for | ||||||
6183 | // this is in CodeGen, so we need to factor it around. | ||||||
6184 | if (FD->isBitField()) { | ||||||
6185 | Info.FFDiag(BCE->getBeginLoc(), | ||||||
6186 | diag::note_constexpr_bit_cast_unsupported_bitfield); | ||||||
6187 | return None; | ||||||
6188 | } | ||||||
6189 | |||||||
6190 | uint64_t FieldOffsetBits = Layout.getFieldOffset(FieldIdx); | ||||||
6191 | assert(FieldOffsetBits % Info.Ctx.getCharWidth() == 0)((FieldOffsetBits % Info.Ctx.getCharWidth() == 0) ? static_cast <void> (0) : __assert_fail ("FieldOffsetBits % Info.Ctx.getCharWidth() == 0" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6191, __PRETTY_FUNCTION__)); | ||||||
6192 | |||||||
6193 | CharUnits FieldOffset = | ||||||
6194 | CharUnits::fromQuantity(FieldOffsetBits / Info.Ctx.getCharWidth()) + | ||||||
6195 | Offset; | ||||||
6196 | QualType FieldTy = FD->getType(); | ||||||
6197 | Optional<APValue> SubObj = visitType(FieldTy, FieldOffset); | ||||||
6198 | if (!SubObj) | ||||||
6199 | return None; | ||||||
6200 | ResultVal.getStructField(FieldIdx) = *SubObj; | ||||||
6201 | ++FieldIdx; | ||||||
6202 | } | ||||||
6203 | |||||||
6204 | return ResultVal; | ||||||
6205 | } | ||||||
6206 | |||||||
6207 | Optional<APValue> visit(const EnumType *Ty, CharUnits Offset) { | ||||||
6208 | QualType RepresentationType = Ty->getDecl()->getIntegerType(); | ||||||
6209 | assert(!RepresentationType.isNull() &&((!RepresentationType.isNull() && "enum forward decl should be caught by Sema" ) ? static_cast<void> (0) : __assert_fail ("!RepresentationType.isNull() && \"enum forward decl should be caught by Sema\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6210, __PRETTY_FUNCTION__)) | ||||||
6210 | "enum forward decl should be caught by Sema")((!RepresentationType.isNull() && "enum forward decl should be caught by Sema" ) ? static_cast<void> (0) : __assert_fail ("!RepresentationType.isNull() && \"enum forward decl should be caught by Sema\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6210, __PRETTY_FUNCTION__)); | ||||||
6211 | const BuiltinType *AsBuiltin = | ||||||
6212 | RepresentationType.getCanonicalType()->getAs<BuiltinType>(); | ||||||
6213 | assert(AsBuiltin && "non-integral enum underlying type?")((AsBuiltin && "non-integral enum underlying type?") ? static_cast<void> (0) : __assert_fail ("AsBuiltin && \"non-integral enum underlying type?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6213, __PRETTY_FUNCTION__)); | ||||||
6214 | // Recurse into the underlying type. Treat std::byte transparently as | ||||||
6215 | // unsigned char. | ||||||
6216 | return visit(AsBuiltin, Offset, /*EnumTy=*/Ty); | ||||||
6217 | } | ||||||
6218 | |||||||
6219 | Optional<APValue> visit(const ConstantArrayType *Ty, CharUnits Offset) { | ||||||
6220 | size_t Size = Ty->getSize().getLimitedValue(); | ||||||
6221 | CharUnits ElementWidth = Info.Ctx.getTypeSizeInChars(Ty->getElementType()); | ||||||
6222 | |||||||
6223 | APValue ArrayValue(APValue::UninitArray(), Size, Size); | ||||||
6224 | for (size_t I = 0; I != Size; ++I) { | ||||||
6225 | Optional<APValue> ElementValue = | ||||||
6226 | visitType(Ty->getElementType(), Offset + I * ElementWidth); | ||||||
6227 | if (!ElementValue) | ||||||
6228 | return None; | ||||||
6229 | ArrayValue.getArrayInitializedElt(I) = std::move(*ElementValue); | ||||||
6230 | } | ||||||
6231 | |||||||
6232 | return ArrayValue; | ||||||
6233 | } | ||||||
6234 | |||||||
6235 | Optional<APValue> visit(const Type *Ty, CharUnits Offset) { | ||||||
6236 | return unsupportedType(QualType(Ty, 0)); | ||||||
6237 | } | ||||||
6238 | |||||||
6239 | Optional<APValue> visitType(QualType Ty, CharUnits Offset) { | ||||||
6240 | QualType Can = Ty.getCanonicalType(); | ||||||
6241 | |||||||
6242 | switch (Can->getTypeClass()) { | ||||||
6243 | #define TYPE(Class, Base) \ | ||||||
6244 | case Type::Class: \ | ||||||
6245 | return visit(cast<Class##Type>(Can.getTypePtr()), Offset); | ||||||
6246 | #define ABSTRACT_TYPE(Class, Base) | ||||||
6247 | #define NON_CANONICAL_TYPE(Class, Base) \ | ||||||
6248 | case Type::Class: \ | ||||||
6249 | llvm_unreachable("non-canonical type should be impossible!")::llvm::llvm_unreachable_internal("non-canonical type should be impossible!" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6249); | ||||||
6250 | #define DEPENDENT_TYPE(Class, Base) \ | ||||||
6251 | case Type::Class: \ | ||||||
6252 | llvm_unreachable( \::llvm::llvm_unreachable_internal("dependent types aren't supported in the constant evaluator!" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6253) | ||||||
6253 | "dependent types aren't supported in the constant evaluator!")::llvm::llvm_unreachable_internal("dependent types aren't supported in the constant evaluator!" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6253); | ||||||
6254 | #define NON_CANONICAL_UNLESS_DEPENDENT(Class, Base)case Type::Class: ::llvm::llvm_unreachable_internal("either dependent or not canonical!" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6254); \ | ||||||
6255 | case Type::Class: \ | ||||||
6256 | llvm_unreachable("either dependent or not canonical!")::llvm::llvm_unreachable_internal("either dependent or not canonical!" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6256); | ||||||
6257 | #include "clang/AST/TypeNodes.def" | ||||||
6258 | } | ||||||
6259 | llvm_unreachable("Unhandled Type::TypeClass")::llvm::llvm_unreachable_internal("Unhandled Type::TypeClass" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6259); | ||||||
6260 | } | ||||||
6261 | |||||||
6262 | public: | ||||||
6263 | // Pull out a full value of type DstType. | ||||||
6264 | static Optional<APValue> convert(EvalInfo &Info, BitCastBuffer &Buffer, | ||||||
6265 | const CastExpr *BCE) { | ||||||
6266 | BufferToAPValueConverter Converter(Info, Buffer, BCE); | ||||||
6267 | return Converter.visitType(BCE->getType(), CharUnits::fromQuantity(0)); | ||||||
6268 | } | ||||||
6269 | }; | ||||||
6270 | |||||||
6271 | static bool checkBitCastConstexprEligibilityType(SourceLocation Loc, | ||||||
6272 | QualType Ty, EvalInfo *Info, | ||||||
6273 | const ASTContext &Ctx, | ||||||
6274 | bool CheckingDest) { | ||||||
6275 | Ty = Ty.getCanonicalType(); | ||||||
6276 | |||||||
6277 | auto diag = [&](int Reason) { | ||||||
6278 | if (Info) | ||||||
6279 | Info->FFDiag(Loc, diag::note_constexpr_bit_cast_invalid_type) | ||||||
6280 | << CheckingDest << (Reason == 4) << Reason; | ||||||
6281 | return false; | ||||||
6282 | }; | ||||||
6283 | auto note = [&](int Construct, QualType NoteTy, SourceLocation NoteLoc) { | ||||||
6284 | if (Info) | ||||||
6285 | Info->Note(NoteLoc, diag::note_constexpr_bit_cast_invalid_subtype) | ||||||
6286 | << NoteTy << Construct << Ty; | ||||||
6287 | return false; | ||||||
6288 | }; | ||||||
6289 | |||||||
6290 | if (Ty->isUnionType()) | ||||||
6291 | return diag(0); | ||||||
6292 | if (Ty->isPointerType()) | ||||||
6293 | return diag(1); | ||||||
6294 | if (Ty->isMemberPointerType()) | ||||||
6295 | return diag(2); | ||||||
6296 | if (Ty.isVolatileQualified()) | ||||||
6297 | return diag(3); | ||||||
6298 | |||||||
6299 | if (RecordDecl *Record = Ty->getAsRecordDecl()) { | ||||||
6300 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(Record)) { | ||||||
6301 | for (CXXBaseSpecifier &BS : CXXRD->bases()) | ||||||
6302 | if (!checkBitCastConstexprEligibilityType(Loc, BS.getType(), Info, Ctx, | ||||||
6303 | CheckingDest)) | ||||||
6304 | return note(1, BS.getType(), BS.getBeginLoc()); | ||||||
6305 | } | ||||||
6306 | for (FieldDecl *FD : Record->fields()) { | ||||||
6307 | if (FD->getType()->isReferenceType()) | ||||||
6308 | return diag(4); | ||||||
6309 | if (!checkBitCastConstexprEligibilityType(Loc, FD->getType(), Info, Ctx, | ||||||
6310 | CheckingDest)) | ||||||
6311 | return note(0, FD->getType(), FD->getBeginLoc()); | ||||||
6312 | } | ||||||
6313 | } | ||||||
6314 | |||||||
6315 | if (Ty->isArrayType() && | ||||||
6316 | !checkBitCastConstexprEligibilityType(Loc, Ctx.getBaseElementType(Ty), | ||||||
6317 | Info, Ctx, CheckingDest)) | ||||||
6318 | return false; | ||||||
6319 | |||||||
6320 | return true; | ||||||
6321 | } | ||||||
6322 | |||||||
6323 | static bool checkBitCastConstexprEligibility(EvalInfo *Info, | ||||||
6324 | const ASTContext &Ctx, | ||||||
6325 | const CastExpr *BCE) { | ||||||
6326 | bool DestOK = checkBitCastConstexprEligibilityType( | ||||||
6327 | BCE->getBeginLoc(), BCE->getType(), Info, Ctx, true); | ||||||
6328 | bool SourceOK = DestOK && checkBitCastConstexprEligibilityType( | ||||||
6329 | BCE->getBeginLoc(), | ||||||
6330 | BCE->getSubExpr()->getType(), Info, Ctx, false); | ||||||
6331 | return SourceOK; | ||||||
6332 | } | ||||||
6333 | |||||||
6334 | static bool handleLValueToRValueBitCast(EvalInfo &Info, APValue &DestValue, | ||||||
6335 | APValue &SourceValue, | ||||||
6336 | const CastExpr *BCE) { | ||||||
6337 | assert(CHAR_BIT == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 &&((8 == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 && "no host or target supports non 8-bit chars") ? static_cast<void> (0) : __assert_fail ("CHAR_BIT == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 && \"no host or target supports non 8-bit chars\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6338, __PRETTY_FUNCTION__)) | ||||||
6338 | "no host or target supports non 8-bit chars")((8 == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 && "no host or target supports non 8-bit chars") ? static_cast<void> (0) : __assert_fail ("CHAR_BIT == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 && \"no host or target supports non 8-bit chars\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6338, __PRETTY_FUNCTION__)); | ||||||
6339 | assert(SourceValue.isLValue() &&((SourceValue.isLValue() && "LValueToRValueBitcast requires an lvalue operand!" ) ? static_cast<void> (0) : __assert_fail ("SourceValue.isLValue() && \"LValueToRValueBitcast requires an lvalue operand!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6340, __PRETTY_FUNCTION__)) | ||||||
6340 | "LValueToRValueBitcast requires an lvalue operand!")((SourceValue.isLValue() && "LValueToRValueBitcast requires an lvalue operand!" ) ? static_cast<void> (0) : __assert_fail ("SourceValue.isLValue() && \"LValueToRValueBitcast requires an lvalue operand!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6340, __PRETTY_FUNCTION__)); | ||||||
6341 | |||||||
6342 | if (!checkBitCastConstexprEligibility(&Info, Info.Ctx, BCE)) | ||||||
6343 | return false; | ||||||
6344 | |||||||
6345 | LValue SourceLValue; | ||||||
6346 | APValue SourceRValue; | ||||||
6347 | SourceLValue.setFrom(Info.Ctx, SourceValue); | ||||||
6348 | if (!handleLValueToRValueConversion( | ||||||
6349 | Info, BCE, BCE->getSubExpr()->getType().withConst(), SourceLValue, | ||||||
6350 | SourceRValue, /*WantObjectRepresentation=*/true)) | ||||||
6351 | return false; | ||||||
6352 | |||||||
6353 | // Read out SourceValue into a char buffer. | ||||||
6354 | Optional<BitCastBuffer> Buffer = | ||||||
6355 | APValueToBufferConverter::convert(Info, SourceRValue, BCE); | ||||||
6356 | if (!Buffer) | ||||||
6357 | return false; | ||||||
6358 | |||||||
6359 | // Write out the buffer into a new APValue. | ||||||
6360 | Optional<APValue> MaybeDestValue = | ||||||
6361 | BufferToAPValueConverter::convert(Info, *Buffer, BCE); | ||||||
6362 | if (!MaybeDestValue) | ||||||
6363 | return false; | ||||||
6364 | |||||||
6365 | DestValue = std::move(*MaybeDestValue); | ||||||
6366 | return true; | ||||||
6367 | } | ||||||
6368 | |||||||
6369 | template <class Derived> | ||||||
6370 | class ExprEvaluatorBase | ||||||
6371 | : public ConstStmtVisitor<Derived, bool> { | ||||||
6372 | private: | ||||||
6373 | Derived &getDerived() { return static_cast<Derived&>(*this); } | ||||||
6374 | bool DerivedSuccess(const APValue &V, const Expr *E) { | ||||||
6375 | return getDerived().Success(V, E); | ||||||
6376 | } | ||||||
6377 | bool DerivedZeroInitialization(const Expr *E) { | ||||||
6378 | return getDerived().ZeroInitialization(E); | ||||||
6379 | } | ||||||
6380 | |||||||
6381 | // Check whether a conditional operator with a non-constant condition is a | ||||||
6382 | // potential constant expression. If neither arm is a potential constant | ||||||
6383 | // expression, then the conditional operator is not either. | ||||||
6384 | template<typename ConditionalOperator> | ||||||
6385 | void CheckPotentialConstantConditional(const ConditionalOperator *E) { | ||||||
6386 | assert(Info.checkingPotentialConstantExpression())((Info.checkingPotentialConstantExpression()) ? static_cast< void> (0) : __assert_fail ("Info.checkingPotentialConstantExpression()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6386, __PRETTY_FUNCTION__)); | ||||||
6387 | |||||||
6388 | // Speculatively evaluate both arms. | ||||||
6389 | SmallVector<PartialDiagnosticAt, 8> Diag; | ||||||
6390 | { | ||||||
6391 | SpeculativeEvaluationRAII Speculate(Info, &Diag); | ||||||
6392 | StmtVisitorTy::Visit(E->getFalseExpr()); | ||||||
6393 | if (Diag.empty()) | ||||||
6394 | return; | ||||||
6395 | } | ||||||
6396 | |||||||
6397 | { | ||||||
6398 | SpeculativeEvaluationRAII Speculate(Info, &Diag); | ||||||
6399 | Diag.clear(); | ||||||
6400 | StmtVisitorTy::Visit(E->getTrueExpr()); | ||||||
6401 | if (Diag.empty()) | ||||||
6402 | return; | ||||||
6403 | } | ||||||
6404 | |||||||
6405 | Error(E, diag::note_constexpr_conditional_never_const); | ||||||
6406 | } | ||||||
6407 | |||||||
6408 | |||||||
6409 | template<typename ConditionalOperator> | ||||||
6410 | bool HandleConditionalOperator(const ConditionalOperator *E) { | ||||||
6411 | bool BoolResult; | ||||||
6412 | if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) { | ||||||
6413 | if (Info.checkingPotentialConstantExpression() && Info.noteFailure()) { | ||||||
6414 | CheckPotentialConstantConditional(E); | ||||||
6415 | return false; | ||||||
6416 | } | ||||||
6417 | if (Info.noteFailure()) { | ||||||
6418 | StmtVisitorTy::Visit(E->getTrueExpr()); | ||||||
6419 | StmtVisitorTy::Visit(E->getFalseExpr()); | ||||||
6420 | } | ||||||
6421 | return false; | ||||||
6422 | } | ||||||
6423 | |||||||
6424 | Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); | ||||||
6425 | return StmtVisitorTy::Visit(EvalExpr); | ||||||
6426 | } | ||||||
6427 | |||||||
6428 | protected: | ||||||
6429 | EvalInfo &Info; | ||||||
6430 | typedef ConstStmtVisitor<Derived, bool> StmtVisitorTy; | ||||||
6431 | typedef ExprEvaluatorBase ExprEvaluatorBaseTy; | ||||||
6432 | |||||||
6433 | OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { | ||||||
6434 | return Info.CCEDiag(E, D); | ||||||
6435 | } | ||||||
6436 | |||||||
6437 | bool ZeroInitialization(const Expr *E) { return Error(E); } | ||||||
6438 | |||||||
6439 | public: | ||||||
6440 | ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} | ||||||
6441 | |||||||
6442 | EvalInfo &getEvalInfo() { return Info; } | ||||||
6443 | |||||||
6444 | /// Report an evaluation error. This should only be called when an error is | ||||||
6445 | /// first discovered. When propagating an error, just return false. | ||||||
6446 | bool Error(const Expr *E, diag::kind D) { | ||||||
6447 | Info.FFDiag(E, D); | ||||||
6448 | return false; | ||||||
6449 | } | ||||||
6450 | bool Error(const Expr *E) { | ||||||
6451 | return Error(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
6452 | } | ||||||
6453 | |||||||
6454 | bool VisitStmt(const Stmt *) { | ||||||
6455 | llvm_unreachable("Expression evaluator should not be called on stmts")::llvm::llvm_unreachable_internal("Expression evaluator should not be called on stmts" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6455); | ||||||
6456 | } | ||||||
6457 | bool VisitExpr(const Expr *E) { | ||||||
6458 | return Error(E); | ||||||
6459 | } | ||||||
6460 | |||||||
6461 | bool VisitConstantExpr(const ConstantExpr *E) | ||||||
6462 | { return StmtVisitorTy::Visit(E->getSubExpr()); } | ||||||
6463 | bool VisitParenExpr(const ParenExpr *E) | ||||||
6464 | { return StmtVisitorTy::Visit(E->getSubExpr()); } | ||||||
6465 | bool VisitUnaryExtension(const UnaryOperator *E) | ||||||
6466 | { return StmtVisitorTy::Visit(E->getSubExpr()); } | ||||||
6467 | bool VisitUnaryPlus(const UnaryOperator *E) | ||||||
6468 | { return StmtVisitorTy::Visit(E->getSubExpr()); } | ||||||
6469 | bool VisitChooseExpr(const ChooseExpr *E) | ||||||
6470 | { return StmtVisitorTy::Visit(E->getChosenSubExpr()); } | ||||||
6471 | bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) | ||||||
6472 | { return StmtVisitorTy::Visit(E->getResultExpr()); } | ||||||
6473 | bool VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) | ||||||
6474 | { return StmtVisitorTy::Visit(E->getReplacement()); } | ||||||
6475 | bool VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) { | ||||||
6476 | TempVersionRAII RAII(*Info.CurrentCall); | ||||||
6477 | SourceLocExprScopeGuard Guard(E, Info.CurrentCall->CurSourceLocExprScope); | ||||||
6478 | return StmtVisitorTy::Visit(E->getExpr()); | ||||||
6479 | } | ||||||
6480 | bool VisitCXXDefaultInitExpr(const CXXDefaultInitExpr *E) { | ||||||
6481 | TempVersionRAII RAII(*Info.CurrentCall); | ||||||
6482 | // The initializer may not have been parsed yet, or might be erroneous. | ||||||
6483 | if (!E->getExpr()) | ||||||
6484 | return Error(E); | ||||||
6485 | SourceLocExprScopeGuard Guard(E, Info.CurrentCall->CurSourceLocExprScope); | ||||||
6486 | return StmtVisitorTy::Visit(E->getExpr()); | ||||||
6487 | } | ||||||
6488 | |||||||
6489 | bool VisitExprWithCleanups(const ExprWithCleanups *E) { | ||||||
6490 | FullExpressionRAII Scope(Info); | ||||||
6491 | return StmtVisitorTy::Visit(E->getSubExpr()) && Scope.destroy(); | ||||||
6492 | } | ||||||
6493 | |||||||
6494 | bool VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { | ||||||
6495 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; | ||||||
6496 | return static_cast<Derived*>(this)->VisitCastExpr(E); | ||||||
6497 | } | ||||||
6498 | bool VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { | ||||||
6499 | if (!Info.Ctx.getLangOpts().CPlusPlus2a) | ||||||
6500 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; | ||||||
6501 | return static_cast<Derived*>(this)->VisitCastExpr(E); | ||||||
6502 | } | ||||||
6503 | bool VisitBuiltinBitCastExpr(const BuiltinBitCastExpr *E) { | ||||||
6504 | return static_cast<Derived*>(this)->VisitCastExpr(E); | ||||||
6505 | } | ||||||
6506 | |||||||
6507 | bool VisitBinaryOperator(const BinaryOperator *E) { | ||||||
6508 | switch (E->getOpcode()) { | ||||||
6509 | default: | ||||||
6510 | return Error(E); | ||||||
6511 | |||||||
6512 | case BO_Comma: | ||||||
6513 | VisitIgnoredValue(E->getLHS()); | ||||||
6514 | return StmtVisitorTy::Visit(E->getRHS()); | ||||||
6515 | |||||||
6516 | case BO_PtrMemD: | ||||||
6517 | case BO_PtrMemI: { | ||||||
6518 | LValue Obj; | ||||||
6519 | if (!HandleMemberPointerAccess(Info, E, Obj)) | ||||||
6520 | return false; | ||||||
6521 | APValue Result; | ||||||
6522 | if (!handleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) | ||||||
6523 | return false; | ||||||
6524 | return DerivedSuccess(Result, E); | ||||||
6525 | } | ||||||
6526 | } | ||||||
6527 | } | ||||||
6528 | |||||||
6529 | bool VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { | ||||||
6530 | // Evaluate and cache the common expression. We treat it as a temporary, | ||||||
6531 | // even though it's not quite the same thing. | ||||||
6532 | LValue CommonLV; | ||||||
6533 | if (!Evaluate(Info.CurrentCall->createTemporary( | ||||||
6534 | E->getOpaqueValue(), | ||||||
6535 | getStorageType(Info.Ctx, E->getOpaqueValue()), false, | ||||||
6536 | CommonLV), | ||||||
6537 | Info, E->getCommon())) | ||||||
6538 | return false; | ||||||
6539 | |||||||
6540 | return HandleConditionalOperator(E); | ||||||
6541 | } | ||||||
6542 | |||||||
6543 | bool VisitConditionalOperator(const ConditionalOperator *E) { | ||||||
6544 | bool IsBcpCall = false; | ||||||
6545 | // If the condition (ignoring parens) is a __builtin_constant_p call, | ||||||
6546 | // the result is a constant expression if it can be folded without | ||||||
6547 | // side-effects. This is an important GNU extension. See GCC PR38377 | ||||||
6548 | // for discussion. | ||||||
6549 | if (const CallExpr *CallCE = | ||||||
6550 | dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) | ||||||
6551 | if (CallCE->getBuiltinCallee() == Builtin::BI__builtin_constant_p) | ||||||
6552 | IsBcpCall = true; | ||||||
6553 | |||||||
6554 | // Always assume __builtin_constant_p(...) ? ... : ... is a potential | ||||||
6555 | // constant expression; we can't check whether it's potentially foldable. | ||||||
6556 | // FIXME: We should instead treat __builtin_constant_p as non-constant if | ||||||
6557 | // it would return 'false' in this mode. | ||||||
6558 | if (Info.checkingPotentialConstantExpression() && IsBcpCall) | ||||||
6559 | return false; | ||||||
6560 | |||||||
6561 | FoldConstant Fold(Info, IsBcpCall); | ||||||
6562 | if (!HandleConditionalOperator(E)) { | ||||||
6563 | Fold.keepDiagnostics(); | ||||||
6564 | return false; | ||||||
6565 | } | ||||||
6566 | |||||||
6567 | return true; | ||||||
6568 | } | ||||||
6569 | |||||||
6570 | bool VisitOpaqueValueExpr(const OpaqueValueExpr *E) { | ||||||
6571 | if (APValue *Value = Info.CurrentCall->getCurrentTemporary(E)) | ||||||
6572 | return DerivedSuccess(*Value, E); | ||||||
6573 | |||||||
6574 | const Expr *Source = E->getSourceExpr(); | ||||||
6575 | if (!Source) | ||||||
6576 | return Error(E); | ||||||
6577 | if (Source == E) { // sanity checking. | ||||||
6578 | assert(0 && "OpaqueValueExpr recursively refers to itself")((0 && "OpaqueValueExpr recursively refers to itself" ) ? static_cast<void> (0) : __assert_fail ("0 && \"OpaqueValueExpr recursively refers to itself\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6578, __PRETTY_FUNCTION__)); | ||||||
6579 | return Error(E); | ||||||
6580 | } | ||||||
6581 | return StmtVisitorTy::Visit(Source); | ||||||
6582 | } | ||||||
6583 | |||||||
6584 | bool VisitCallExpr(const CallExpr *E) { | ||||||
6585 | APValue Result; | ||||||
6586 | if (!handleCallExpr(E, Result, nullptr)) | ||||||
| |||||||
6587 | return false; | ||||||
6588 | return DerivedSuccess(Result, E); | ||||||
6589 | } | ||||||
6590 | |||||||
6591 | bool handleCallExpr(const CallExpr *E, APValue &Result, | ||||||
6592 | const LValue *ResultSlot) { | ||||||
6593 | const Expr *Callee = E->getCallee()->IgnoreParens(); | ||||||
6594 | QualType CalleeType = Callee->getType(); | ||||||
6595 | |||||||
6596 | const FunctionDecl *FD = nullptr; | ||||||
6597 | LValue *This = nullptr, ThisVal; | ||||||
6598 | auto Args = llvm::makeArrayRef(E->getArgs(), E->getNumArgs()); | ||||||
6599 | bool HasQualifier = false; | ||||||
6600 | |||||||
6601 | // Extract function decl and 'this' pointer from the callee. | ||||||
6602 | if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { | ||||||
6603 | const CXXMethodDecl *Member = nullptr; | ||||||
6604 | if (const MemberExpr *ME
| ||||||
6605 | // Explicit bound member calls, such as x.f() or p->g(); | ||||||
6606 | if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) | ||||||
6607 | return false; | ||||||
6608 | Member = dyn_cast<CXXMethodDecl>(ME->getMemberDecl()); | ||||||
6609 | if (!Member) | ||||||
6610 | return Error(Callee); | ||||||
6611 | This = &ThisVal; | ||||||
6612 | HasQualifier = ME->hasQualifier(); | ||||||
6613 | } else if (const BinaryOperator *BE
| ||||||
6614 | // Indirect bound member calls ('.*' or '->*'). | ||||||
6615 | Member = dyn_cast_or_null<CXXMethodDecl>( | ||||||
6616 | HandleMemberPointerAccess(Info, BE, ThisVal, false)); | ||||||
6617 | if (!Member
| ||||||
6618 | return Error(Callee); | ||||||
6619 | This = &ThisVal; | ||||||
6620 | } else if (const auto *PDE = dyn_cast<CXXPseudoDestructorExpr>(Callee)) { | ||||||
6621 | if (!Info.getLangOpts().CPlusPlus2a) | ||||||
6622 | Info.CCEDiag(PDE, diag::note_constexpr_pseudo_destructor); | ||||||
6623 | // FIXME: If pseudo-destructor calls ever start ending the lifetime of | ||||||
6624 | // their callee, we should start calling HandleDestruction here. | ||||||
6625 | // For now, we just evaluate the object argument and discard it. | ||||||
6626 | return EvaluateObjectArgument(Info, PDE->getBase(), ThisVal); | ||||||
6627 | } else | ||||||
6628 | return Error(Callee); | ||||||
6629 | FD = Member; | ||||||
6630 | } else if (CalleeType->isFunctionPointerType()) { | ||||||
6631 | LValue Call; | ||||||
6632 | if (!EvaluatePointer(Callee, Call, Info)) | ||||||
6633 | return false; | ||||||
6634 | |||||||
6635 | if (!Call.getLValueOffset().isZero()) | ||||||
6636 | return Error(Callee); | ||||||
6637 | FD = dyn_cast_or_null<FunctionDecl>( | ||||||
6638 | Call.getLValueBase().dyn_cast<const ValueDecl*>()); | ||||||
6639 | if (!FD) | ||||||
6640 | return Error(Callee); | ||||||
6641 | // Don't call function pointers which have been cast to some other type. | ||||||
6642 | // Per DR (no number yet), the caller and callee can differ in noexcept. | ||||||
6643 | if (!Info.Ctx.hasSameFunctionTypeIgnoringExceptionSpec( | ||||||
6644 | CalleeType->getPointeeType(), FD->getType())) { | ||||||
6645 | return Error(E); | ||||||
6646 | } | ||||||
6647 | |||||||
6648 | // Overloaded operator calls to member functions are represented as normal | ||||||
6649 | // calls with '*this' as the first argument. | ||||||
6650 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); | ||||||
6651 | if (MD && !MD->isStatic()) { | ||||||
6652 | // FIXME: When selecting an implicit conversion for an overloaded | ||||||
6653 | // operator delete, we sometimes try to evaluate calls to conversion | ||||||
6654 | // operators without a 'this' parameter! | ||||||
6655 | if (Args.empty()) | ||||||
6656 | return Error(E); | ||||||
6657 | |||||||
6658 | if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) | ||||||
6659 | return false; | ||||||
6660 | This = &ThisVal; | ||||||
6661 | Args = Args.slice(1); | ||||||
6662 | } else if (MD && MD->isLambdaStaticInvoker()) { | ||||||
6663 | // Map the static invoker for the lambda back to the call operator. | ||||||
6664 | // Conveniently, we don't have to slice out the 'this' argument (as is | ||||||
6665 | // being done for the non-static case), since a static member function | ||||||
6666 | // doesn't have an implicit argument passed in. | ||||||
6667 | const CXXRecordDecl *ClosureClass = MD->getParent(); | ||||||
6668 | assert(((ClosureClass->captures_begin() == ClosureClass->captures_end () && "Number of captures must be zero for conversion to function-ptr" ) ? static_cast<void> (0) : __assert_fail ("ClosureClass->captures_begin() == ClosureClass->captures_end() && \"Number of captures must be zero for conversion to function-ptr\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6670, __PRETTY_FUNCTION__)) | ||||||
6669 | ClosureClass->captures_begin() == ClosureClass->captures_end() &&((ClosureClass->captures_begin() == ClosureClass->captures_end () && "Number of captures must be zero for conversion to function-ptr" ) ? static_cast<void> (0) : __assert_fail ("ClosureClass->captures_begin() == ClosureClass->captures_end() && \"Number of captures must be zero for conversion to function-ptr\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6670, __PRETTY_FUNCTION__)) | ||||||
6670 | "Number of captures must be zero for conversion to function-ptr")((ClosureClass->captures_begin() == ClosureClass->captures_end () && "Number of captures must be zero for conversion to function-ptr" ) ? static_cast<void> (0) : __assert_fail ("ClosureClass->captures_begin() == ClosureClass->captures_end() && \"Number of captures must be zero for conversion to function-ptr\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6670, __PRETTY_FUNCTION__)); | ||||||
6671 | |||||||
6672 | const CXXMethodDecl *LambdaCallOp = | ||||||
6673 | ClosureClass->getLambdaCallOperator(); | ||||||
6674 | |||||||
6675 | // Set 'FD', the function that will be called below, to the call | ||||||
6676 | // operator. If the closure object represents a generic lambda, find | ||||||
6677 | // the corresponding specialization of the call operator. | ||||||
6678 | |||||||
6679 | if (ClosureClass->isGenericLambda()) { | ||||||
6680 | assert(MD->isFunctionTemplateSpecialization() &&((MD->isFunctionTemplateSpecialization() && "A generic lambda's static-invoker function must be a " "template specialization") ? static_cast<void> (0) : __assert_fail ("MD->isFunctionTemplateSpecialization() && \"A generic lambda's static-invoker function must be a \" \"template specialization\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6682, __PRETTY_FUNCTION__)) | ||||||
6681 | "A generic lambda's static-invoker function must be a "((MD->isFunctionTemplateSpecialization() && "A generic lambda's static-invoker function must be a " "template specialization") ? static_cast<void> (0) : __assert_fail ("MD->isFunctionTemplateSpecialization() && \"A generic lambda's static-invoker function must be a \" \"template specialization\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6682, __PRETTY_FUNCTION__)) | ||||||
6682 | "template specialization")((MD->isFunctionTemplateSpecialization() && "A generic lambda's static-invoker function must be a " "template specialization") ? static_cast<void> (0) : __assert_fail ("MD->isFunctionTemplateSpecialization() && \"A generic lambda's static-invoker function must be a \" \"template specialization\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6682, __PRETTY_FUNCTION__)); | ||||||
6683 | const TemplateArgumentList *TAL = MD->getTemplateSpecializationArgs(); | ||||||
6684 | FunctionTemplateDecl *CallOpTemplate = | ||||||
6685 | LambdaCallOp->getDescribedFunctionTemplate(); | ||||||
6686 | void *InsertPos = nullptr; | ||||||
6687 | FunctionDecl *CorrespondingCallOpSpecialization = | ||||||
6688 | CallOpTemplate->findSpecialization(TAL->asArray(), InsertPos); | ||||||
6689 | assert(CorrespondingCallOpSpecialization &&((CorrespondingCallOpSpecialization && "We must always have a function call operator specialization " "that corresponds to our static invoker specialization") ? static_cast <void> (0) : __assert_fail ("CorrespondingCallOpSpecialization && \"We must always have a function call operator specialization \" \"that corresponds to our static invoker specialization\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6691, __PRETTY_FUNCTION__)) | ||||||
6690 | "We must always have a function call operator specialization "((CorrespondingCallOpSpecialization && "We must always have a function call operator specialization " "that corresponds to our static invoker specialization") ? static_cast <void> (0) : __assert_fail ("CorrespondingCallOpSpecialization && \"We must always have a function call operator specialization \" \"that corresponds to our static invoker specialization\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6691, __PRETTY_FUNCTION__)) | ||||||
6691 | "that corresponds to our static invoker specialization")((CorrespondingCallOpSpecialization && "We must always have a function call operator specialization " "that corresponds to our static invoker specialization") ? static_cast <void> (0) : __assert_fail ("CorrespondingCallOpSpecialization && \"We must always have a function call operator specialization \" \"that corresponds to our static invoker specialization\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6691, __PRETTY_FUNCTION__)); | ||||||
6692 | FD = cast<CXXMethodDecl>(CorrespondingCallOpSpecialization); | ||||||
6693 | } else | ||||||
6694 | FD = LambdaCallOp; | ||||||
6695 | } | ||||||
6696 | } else | ||||||
6697 | return Error(E); | ||||||
6698 | |||||||
6699 | SmallVector<QualType, 4> CovariantAdjustmentPath; | ||||||
6700 | if (This
| ||||||
6701 | auto *NamedMember = dyn_cast<CXXMethodDecl>(FD); | ||||||
6702 | if (NamedMember
| ||||||
6703 | // Perform virtual dispatch, if necessary. | ||||||
6704 | FD = HandleVirtualDispatch(Info, E, *This, NamedMember, | ||||||
6705 | CovariantAdjustmentPath); | ||||||
6706 | if (!FD) | ||||||
6707 | return false; | ||||||
6708 | } else { | ||||||
6709 | // Check that the 'this' pointer points to an object of the right type. | ||||||
6710 | // FIXME: If this is an assignment operator call, we may need to change | ||||||
6711 | // the active union member before we check this. | ||||||
6712 | if (!checkNonVirtualMemberCallThisPointer(Info, E, *This, NamedMember)) | ||||||
6713 | return false; | ||||||
6714 | } | ||||||
6715 | } | ||||||
6716 | |||||||
6717 | // Destructor calls are different enough that they have their own codepath. | ||||||
6718 | if (auto *DD
| ||||||
6719 | assert(This && "no 'this' pointer for destructor call")((This && "no 'this' pointer for destructor call") ? static_cast <void> (0) : __assert_fail ("This && \"no 'this' pointer for destructor call\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6719, __PRETTY_FUNCTION__)); | ||||||
6720 | return HandleDestruction(Info, E, *This, | ||||||
6721 | Info.Ctx.getRecordType(DD->getParent())); | ||||||
6722 | } | ||||||
6723 | |||||||
6724 | const FunctionDecl *Definition = nullptr; | ||||||
6725 | Stmt *Body = FD->getBody(Definition); | ||||||
6726 | |||||||
6727 | if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition, Body) || | ||||||
6728 | !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Body, Info, | ||||||
6729 | Result, ResultSlot)) | ||||||
6730 | return false; | ||||||
6731 | |||||||
6732 | if (!CovariantAdjustmentPath.empty() && | ||||||
6733 | !HandleCovariantReturnAdjustment(Info, E, Result, | ||||||
6734 | CovariantAdjustmentPath)) | ||||||
6735 | return false; | ||||||
6736 | |||||||
6737 | return true; | ||||||
6738 | } | ||||||
6739 | |||||||
6740 | bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { | ||||||
6741 | return StmtVisitorTy::Visit(E->getInitializer()); | ||||||
6742 | } | ||||||
6743 | bool VisitInitListExpr(const InitListExpr *E) { | ||||||
6744 | if (E->getNumInits() == 0) | ||||||
6745 | return DerivedZeroInitialization(E); | ||||||
6746 | if (E->getNumInits() == 1) | ||||||
6747 | return StmtVisitorTy::Visit(E->getInit(0)); | ||||||
6748 | return Error(E); | ||||||
6749 | } | ||||||
6750 | bool VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { | ||||||
6751 | return DerivedZeroInitialization(E); | ||||||
6752 | } | ||||||
6753 | bool VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { | ||||||
6754 | return DerivedZeroInitialization(E); | ||||||
6755 | } | ||||||
6756 | bool VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { | ||||||
6757 | return DerivedZeroInitialization(E); | ||||||
6758 | } | ||||||
6759 | |||||||
6760 | /// A member expression where the object is a prvalue is itself a prvalue. | ||||||
6761 | bool VisitMemberExpr(const MemberExpr *E) { | ||||||
6762 | assert(!Info.Ctx.getLangOpts().CPlusPlus11 &&((!Info.Ctx.getLangOpts().CPlusPlus11 && "missing temporary materialization conversion" ) ? static_cast<void> (0) : __assert_fail ("!Info.Ctx.getLangOpts().CPlusPlus11 && \"missing temporary materialization conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6763, __PRETTY_FUNCTION__)) | ||||||
6763 | "missing temporary materialization conversion")((!Info.Ctx.getLangOpts().CPlusPlus11 && "missing temporary materialization conversion" ) ? static_cast<void> (0) : __assert_fail ("!Info.Ctx.getLangOpts().CPlusPlus11 && \"missing temporary materialization conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6763, __PRETTY_FUNCTION__)); | ||||||
6764 | assert(!E->isArrow() && "missing call to bound member function?")((!E->isArrow() && "missing call to bound member function?" ) ? static_cast<void> (0) : __assert_fail ("!E->isArrow() && \"missing call to bound member function?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6764, __PRETTY_FUNCTION__)); | ||||||
6765 | |||||||
6766 | APValue Val; | ||||||
6767 | if (!Evaluate(Val, Info, E->getBase())) | ||||||
6768 | return false; | ||||||
6769 | |||||||
6770 | QualType BaseTy = E->getBase()->getType(); | ||||||
6771 | |||||||
6772 | const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); | ||||||
6773 | if (!FD) return Error(E); | ||||||
6774 | assert(!FD->getType()->isReferenceType() && "prvalue reference?")((!FD->getType()->isReferenceType() && "prvalue reference?" ) ? static_cast<void> (0) : __assert_fail ("!FD->getType()->isReferenceType() && \"prvalue reference?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6774, __PRETTY_FUNCTION__)); | ||||||
6775 | assert(BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() ==((BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl () == FD->getParent()->getCanonicalDecl() && "record / field mismatch" ) ? static_cast<void> (0) : __assert_fail ("BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6776, __PRETTY_FUNCTION__)) | ||||||
6776 | FD->getParent()->getCanonicalDecl() && "record / field mismatch")((BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl () == FD->getParent()->getCanonicalDecl() && "record / field mismatch" ) ? static_cast<void> (0) : __assert_fail ("BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6776, __PRETTY_FUNCTION__)); | ||||||
6777 | |||||||
6778 | // Note: there is no lvalue base here. But this case should only ever | ||||||
6779 | // happen in C or in C++98, where we cannot be evaluating a constexpr | ||||||
6780 | // constructor, which is the only case the base matters. | ||||||
6781 | CompleteObject Obj(APValue::LValueBase(), &Val, BaseTy); | ||||||
6782 | SubobjectDesignator Designator(BaseTy); | ||||||
6783 | Designator.addDeclUnchecked(FD); | ||||||
6784 | |||||||
6785 | APValue Result; | ||||||
6786 | return extractSubobject(Info, E, Obj, Designator, Result) && | ||||||
6787 | DerivedSuccess(Result, E); | ||||||
6788 | } | ||||||
6789 | |||||||
6790 | bool VisitCastExpr(const CastExpr *E) { | ||||||
6791 | switch (E->getCastKind()) { | ||||||
6792 | default: | ||||||
6793 | break; | ||||||
6794 | |||||||
6795 | case CK_AtomicToNonAtomic: { | ||||||
6796 | APValue AtomicVal; | ||||||
6797 | // This does not need to be done in place even for class/array types: | ||||||
6798 | // atomic-to-non-atomic conversion implies copying the object | ||||||
6799 | // representation. | ||||||
6800 | if (!Evaluate(AtomicVal, Info, E->getSubExpr())) | ||||||
6801 | return false; | ||||||
6802 | return DerivedSuccess(AtomicVal, E); | ||||||
6803 | } | ||||||
6804 | |||||||
6805 | case CK_NoOp: | ||||||
6806 | case CK_UserDefinedConversion: | ||||||
6807 | return StmtVisitorTy::Visit(E->getSubExpr()); | ||||||
6808 | |||||||
6809 | case CK_LValueToRValue: { | ||||||
6810 | LValue LVal; | ||||||
6811 | if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) | ||||||
6812 | return false; | ||||||
6813 | APValue RVal; | ||||||
6814 | // Note, we use the subexpression's type in order to retain cv-qualifiers. | ||||||
6815 | if (!handleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), | ||||||
6816 | LVal, RVal)) | ||||||
6817 | return false; | ||||||
6818 | return DerivedSuccess(RVal, E); | ||||||
6819 | } | ||||||
6820 | case CK_LValueToRValueBitCast: { | ||||||
6821 | APValue DestValue, SourceValue; | ||||||
6822 | if (!Evaluate(SourceValue, Info, E->getSubExpr())) | ||||||
6823 | return false; | ||||||
6824 | if (!handleLValueToRValueBitCast(Info, DestValue, SourceValue, E)) | ||||||
6825 | return false; | ||||||
6826 | return DerivedSuccess(DestValue, E); | ||||||
6827 | } | ||||||
6828 | } | ||||||
6829 | |||||||
6830 | return Error(E); | ||||||
6831 | } | ||||||
6832 | |||||||
6833 | bool VisitUnaryPostInc(const UnaryOperator *UO) { | ||||||
6834 | return VisitUnaryPostIncDec(UO); | ||||||
6835 | } | ||||||
6836 | bool VisitUnaryPostDec(const UnaryOperator *UO) { | ||||||
6837 | return VisitUnaryPostIncDec(UO); | ||||||
6838 | } | ||||||
6839 | bool VisitUnaryPostIncDec(const UnaryOperator *UO) { | ||||||
6840 | if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure()) | ||||||
6841 | return Error(UO); | ||||||
6842 | |||||||
6843 | LValue LVal; | ||||||
6844 | if (!EvaluateLValue(UO->getSubExpr(), LVal, Info)) | ||||||
6845 | return false; | ||||||
6846 | APValue RVal; | ||||||
6847 | if (!handleIncDec(this->Info, UO, LVal, UO->getSubExpr()->getType(), | ||||||
6848 | UO->isIncrementOp(), &RVal)) | ||||||
6849 | return false; | ||||||
6850 | return DerivedSuccess(RVal, UO); | ||||||
6851 | } | ||||||
6852 | |||||||
6853 | bool VisitStmtExpr(const StmtExpr *E) { | ||||||
6854 | // We will have checked the full-expressions inside the statement expression | ||||||
6855 | // when they were completed, and don't need to check them again now. | ||||||
6856 | if (Info.checkingForUndefinedBehavior()) | ||||||
6857 | return Error(E); | ||||||
6858 | |||||||
6859 | const CompoundStmt *CS = E->getSubStmt(); | ||||||
6860 | if (CS->body_empty()) | ||||||
6861 | return true; | ||||||
6862 | |||||||
6863 | BlockScopeRAII Scope(Info); | ||||||
6864 | for (CompoundStmt::const_body_iterator BI = CS->body_begin(), | ||||||
6865 | BE = CS->body_end(); | ||||||
6866 | /**/; ++BI) { | ||||||
6867 | if (BI + 1 == BE) { | ||||||
6868 | const Expr *FinalExpr = dyn_cast<Expr>(*BI); | ||||||
6869 | if (!FinalExpr) { | ||||||
6870 | Info.FFDiag((*BI)->getBeginLoc(), | ||||||
6871 | diag::note_constexpr_stmt_expr_unsupported); | ||||||
6872 | return false; | ||||||
6873 | } | ||||||
6874 | return this->Visit(FinalExpr) && Scope.destroy(); | ||||||
6875 | } | ||||||
6876 | |||||||
6877 | APValue ReturnValue; | ||||||
6878 | StmtResult Result = { ReturnValue, nullptr }; | ||||||
6879 | EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); | ||||||
6880 | if (ESR != ESR_Succeeded) { | ||||||
6881 | // FIXME: If the statement-expression terminated due to 'return', | ||||||
6882 | // 'break', or 'continue', it would be nice to propagate that to | ||||||
6883 | // the outer statement evaluation rather than bailing out. | ||||||
6884 | if (ESR != ESR_Failed) | ||||||
6885 | Info.FFDiag((*BI)->getBeginLoc(), | ||||||
6886 | diag::note_constexpr_stmt_expr_unsupported); | ||||||
6887 | return false; | ||||||
6888 | } | ||||||
6889 | } | ||||||
6890 | |||||||
6891 | llvm_unreachable("Return from function from the loop above.")::llvm::llvm_unreachable_internal("Return from function from the loop above." , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6891); | ||||||
6892 | } | ||||||
6893 | |||||||
6894 | /// Visit a value which is evaluated, but whose value is ignored. | ||||||
6895 | void VisitIgnoredValue(const Expr *E) { | ||||||
6896 | EvaluateIgnoredValue(Info, E); | ||||||
6897 | } | ||||||
6898 | |||||||
6899 | /// Potentially visit a MemberExpr's base expression. | ||||||
6900 | void VisitIgnoredBaseExpression(const Expr *E) { | ||||||
6901 | // While MSVC doesn't evaluate the base expression, it does diagnose the | ||||||
6902 | // presence of side-effecting behavior. | ||||||
6903 | if (Info.getLangOpts().MSVCCompat && !E->HasSideEffects(Info.Ctx)) | ||||||
6904 | return; | ||||||
6905 | VisitIgnoredValue(E); | ||||||
6906 | } | ||||||
6907 | }; | ||||||
6908 | |||||||
6909 | } // namespace | ||||||
6910 | |||||||
6911 | //===----------------------------------------------------------------------===// | ||||||
6912 | // Common base class for lvalue and temporary evaluation. | ||||||
6913 | //===----------------------------------------------------------------------===// | ||||||
6914 | namespace { | ||||||
6915 | template<class Derived> | ||||||
6916 | class LValueExprEvaluatorBase | ||||||
6917 | : public ExprEvaluatorBase<Derived> { | ||||||
6918 | protected: | ||||||
6919 | LValue &Result; | ||||||
6920 | bool InvalidBaseOK; | ||||||
6921 | typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; | ||||||
6922 | typedef ExprEvaluatorBase<Derived> ExprEvaluatorBaseTy; | ||||||
6923 | |||||||
6924 | bool Success(APValue::LValueBase B) { | ||||||
6925 | Result.set(B); | ||||||
6926 | return true; | ||||||
6927 | } | ||||||
6928 | |||||||
6929 | bool evaluatePointer(const Expr *E, LValue &Result) { | ||||||
6930 | return EvaluatePointer(E, Result, this->Info, InvalidBaseOK); | ||||||
6931 | } | ||||||
6932 | |||||||
6933 | public: | ||||||
6934 | LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result, bool InvalidBaseOK) | ||||||
6935 | : ExprEvaluatorBaseTy(Info), Result(Result), | ||||||
6936 | InvalidBaseOK(InvalidBaseOK) {} | ||||||
6937 | |||||||
6938 | bool Success(const APValue &V, const Expr *E) { | ||||||
6939 | Result.setFrom(this->Info.Ctx, V); | ||||||
6940 | return true; | ||||||
6941 | } | ||||||
6942 | |||||||
6943 | bool VisitMemberExpr(const MemberExpr *E) { | ||||||
6944 | // Handle non-static data members. | ||||||
6945 | QualType BaseTy; | ||||||
6946 | bool EvalOK; | ||||||
6947 | if (E->isArrow()) { | ||||||
6948 | EvalOK = evaluatePointer(E->getBase(), Result); | ||||||
6949 | BaseTy = E->getBase()->getType()->castAs<PointerType>()->getPointeeType(); | ||||||
6950 | } else if (E->getBase()->isRValue()) { | ||||||
6951 | assert(E->getBase()->getType()->isRecordType())((E->getBase()->getType()->isRecordType()) ? static_cast <void> (0) : __assert_fail ("E->getBase()->getType()->isRecordType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6951, __PRETTY_FUNCTION__)); | ||||||
6952 | EvalOK = EvaluateTemporary(E->getBase(), Result, this->Info); | ||||||
6953 | BaseTy = E->getBase()->getType(); | ||||||
6954 | } else { | ||||||
6955 | EvalOK = this->Visit(E->getBase()); | ||||||
6956 | BaseTy = E->getBase()->getType(); | ||||||
6957 | } | ||||||
6958 | if (!EvalOK) { | ||||||
6959 | if (!InvalidBaseOK) | ||||||
6960 | return false; | ||||||
6961 | Result.setInvalid(E); | ||||||
6962 | return true; | ||||||
6963 | } | ||||||
6964 | |||||||
6965 | const ValueDecl *MD = E->getMemberDecl(); | ||||||
6966 | if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { | ||||||
6967 | assert(BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() ==((BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl () == FD->getParent()->getCanonicalDecl() && "record / field mismatch" ) ? static_cast<void> (0) : __assert_fail ("BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6968, __PRETTY_FUNCTION__)) | ||||||
6968 | FD->getParent()->getCanonicalDecl() && "record / field mismatch")((BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl () == FD->getParent()->getCanonicalDecl() && "record / field mismatch" ) ? static_cast<void> (0) : __assert_fail ("BaseTy->getAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 6968, __PRETTY_FUNCTION__)); | ||||||
6969 | (void)BaseTy; | ||||||
6970 | if (!HandleLValueMember(this->Info, E, Result, FD)) | ||||||
6971 | return false; | ||||||
6972 | } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { | ||||||
6973 | if (!HandleLValueIndirectMember(this->Info, E, Result, IFD)) | ||||||
6974 | return false; | ||||||
6975 | } else | ||||||
6976 | return this->Error(E); | ||||||
6977 | |||||||
6978 | if (MD->getType()->isReferenceType()) { | ||||||
6979 | APValue RefValue; | ||||||
6980 | if (!handleLValueToRValueConversion(this->Info, E, MD->getType(), Result, | ||||||
6981 | RefValue)) | ||||||
6982 | return false; | ||||||
6983 | return Success(RefValue, E); | ||||||
6984 | } | ||||||
6985 | return true; | ||||||
6986 | } | ||||||
6987 | |||||||
6988 | bool VisitBinaryOperator(const BinaryOperator *E) { | ||||||
6989 | switch (E->getOpcode()) { | ||||||
6990 | default: | ||||||
6991 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | ||||||
6992 | |||||||
6993 | case BO_PtrMemD: | ||||||
6994 | case BO_PtrMemI: | ||||||
6995 | return HandleMemberPointerAccess(this->Info, E, Result); | ||||||
6996 | } | ||||||
6997 | } | ||||||
6998 | |||||||
6999 | bool VisitCastExpr(const CastExpr *E) { | ||||||
7000 | switch (E->getCastKind()) { | ||||||
7001 | default: | ||||||
7002 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
7003 | |||||||
7004 | case CK_DerivedToBase: | ||||||
7005 | case CK_UncheckedDerivedToBase: | ||||||
7006 | if (!this->Visit(E->getSubExpr())) | ||||||
7007 | return false; | ||||||
7008 | |||||||
7009 | // Now figure out the necessary offset to add to the base LV to get from | ||||||
7010 | // the derived class to the base class. | ||||||
7011 | return HandleLValueBasePath(this->Info, E, E->getSubExpr()->getType(), | ||||||
7012 | Result); | ||||||
7013 | } | ||||||
7014 | } | ||||||
7015 | }; | ||||||
7016 | } | ||||||
7017 | |||||||
7018 | //===----------------------------------------------------------------------===// | ||||||
7019 | // LValue Evaluation | ||||||
7020 | // | ||||||
7021 | // This is used for evaluating lvalues (in C and C++), xvalues (in C++11), | ||||||
7022 | // function designators (in C), decl references to void objects (in C), and | ||||||
7023 | // temporaries (if building with -Wno-address-of-temporary). | ||||||
7024 | // | ||||||
7025 | // LValue evaluation produces values comprising a base expression of one of the | ||||||
7026 | // following types: | ||||||
7027 | // - Declarations | ||||||
7028 | // * VarDecl | ||||||
7029 | // * FunctionDecl | ||||||
7030 | // - Literals | ||||||
7031 | // * CompoundLiteralExpr in C (and in global scope in C++) | ||||||
7032 | // * StringLiteral | ||||||
7033 | // * PredefinedExpr | ||||||
7034 | // * ObjCStringLiteralExpr | ||||||
7035 | // * ObjCEncodeExpr | ||||||
7036 | // * AddrLabelExpr | ||||||
7037 | // * BlockExpr | ||||||
7038 | // * CallExpr for a MakeStringConstant builtin | ||||||
7039 | // - typeid(T) expressions, as TypeInfoLValues | ||||||
7040 | // - Locals and temporaries | ||||||
7041 | // * MaterializeTemporaryExpr | ||||||
7042 | // * Any Expr, with a CallIndex indicating the function in which the temporary | ||||||
7043 | // was evaluated, for cases where the MaterializeTemporaryExpr is missing | ||||||
7044 | // from the AST (FIXME). | ||||||
7045 | // * A MaterializeTemporaryExpr that has static storage duration, with no | ||||||
7046 | // CallIndex, for a lifetime-extended temporary. | ||||||
7047 | // plus an offset in bytes. | ||||||
7048 | //===----------------------------------------------------------------------===// | ||||||
7049 | namespace { | ||||||
7050 | class LValueExprEvaluator | ||||||
7051 | : public LValueExprEvaluatorBase<LValueExprEvaluator> { | ||||||
7052 | public: | ||||||
7053 | LValueExprEvaluator(EvalInfo &Info, LValue &Result, bool InvalidBaseOK) : | ||||||
7054 | LValueExprEvaluatorBaseTy(Info, Result, InvalidBaseOK) {} | ||||||
7055 | |||||||
7056 | bool VisitVarDecl(const Expr *E, const VarDecl *VD); | ||||||
7057 | bool VisitUnaryPreIncDec(const UnaryOperator *UO); | ||||||
7058 | |||||||
7059 | bool VisitDeclRefExpr(const DeclRefExpr *E); | ||||||
7060 | bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } | ||||||
7061 | bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); | ||||||
7062 | bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); | ||||||
7063 | bool VisitMemberExpr(const MemberExpr *E); | ||||||
7064 | bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } | ||||||
7065 | bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } | ||||||
7066 | bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); | ||||||
7067 | bool VisitCXXUuidofExpr(const CXXUuidofExpr *E); | ||||||
7068 | bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); | ||||||
7069 | bool VisitUnaryDeref(const UnaryOperator *E); | ||||||
7070 | bool VisitUnaryReal(const UnaryOperator *E); | ||||||
7071 | bool VisitUnaryImag(const UnaryOperator *E); | ||||||
7072 | bool VisitUnaryPreInc(const UnaryOperator *UO) { | ||||||
7073 | return VisitUnaryPreIncDec(UO); | ||||||
7074 | } | ||||||
7075 | bool VisitUnaryPreDec(const UnaryOperator *UO) { | ||||||
7076 | return VisitUnaryPreIncDec(UO); | ||||||
7077 | } | ||||||
7078 | bool VisitBinAssign(const BinaryOperator *BO); | ||||||
7079 | bool VisitCompoundAssignOperator(const CompoundAssignOperator *CAO); | ||||||
7080 | |||||||
7081 | bool VisitCastExpr(const CastExpr *E) { | ||||||
7082 | switch (E->getCastKind()) { | ||||||
7083 | default: | ||||||
7084 | return LValueExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
7085 | |||||||
7086 | case CK_LValueBitCast: | ||||||
7087 | this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; | ||||||
7088 | if (!Visit(E->getSubExpr())) | ||||||
7089 | return false; | ||||||
7090 | Result.Designator.setInvalid(); | ||||||
7091 | return true; | ||||||
7092 | |||||||
7093 | case CK_BaseToDerived: | ||||||
7094 | if (!Visit(E->getSubExpr())) | ||||||
7095 | return false; | ||||||
7096 | return HandleBaseToDerivedCast(Info, E, Result); | ||||||
7097 | |||||||
7098 | case CK_Dynamic: | ||||||
7099 | if (!Visit(E->getSubExpr())) | ||||||
7100 | return false; | ||||||
7101 | return HandleDynamicCast(Info, cast<ExplicitCastExpr>(E), Result); | ||||||
7102 | } | ||||||
7103 | } | ||||||
7104 | }; | ||||||
7105 | } // end anonymous namespace | ||||||
7106 | |||||||
7107 | /// Evaluate an expression as an lvalue. This can be legitimately called on | ||||||
7108 | /// expressions which are not glvalues, in three cases: | ||||||
7109 | /// * function designators in C, and | ||||||
7110 | /// * "extern void" objects | ||||||
7111 | /// * @selector() expressions in Objective-C | ||||||
7112 | static bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info, | ||||||
7113 | bool InvalidBaseOK) { | ||||||
7114 | assert(E->isGLValue() || E->getType()->isFunctionType() ||((E->isGLValue() || E->getType()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr> (E)) ? static_cast<void> (0) : __assert_fail ("E->isGLValue() || E->getType()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E)" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7115, __PRETTY_FUNCTION__)) | ||||||
7115 | E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E))((E->isGLValue() || E->getType()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr> (E)) ? static_cast<void> (0) : __assert_fail ("E->isGLValue() || E->getType()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E)" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7115, __PRETTY_FUNCTION__)); | ||||||
7116 | return LValueExprEvaluator(Info, Result, InvalidBaseOK).Visit(E); | ||||||
7117 | } | ||||||
7118 | |||||||
7119 | bool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { | ||||||
7120 | if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(E->getDecl())) | ||||||
7121 | return Success(FD); | ||||||
7122 | if (const VarDecl *VD = dyn_cast<VarDecl>(E->getDecl())) | ||||||
7123 | return VisitVarDecl(E, VD); | ||||||
7124 | if (const BindingDecl *BD = dyn_cast<BindingDecl>(E->getDecl())) | ||||||
7125 | return Visit(BD->getBinding()); | ||||||
7126 | return Error(E); | ||||||
7127 | } | ||||||
7128 | |||||||
7129 | |||||||
7130 | bool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { | ||||||
7131 | |||||||
7132 | // If we are within a lambda's call operator, check whether the 'VD' referred | ||||||
7133 | // to within 'E' actually represents a lambda-capture that maps to a | ||||||
7134 | // data-member/field within the closure object, and if so, evaluate to the | ||||||
7135 | // field or what the field refers to. | ||||||
7136 | if (Info.CurrentCall && isLambdaCallOperator(Info.CurrentCall->Callee) && | ||||||
7137 | isa<DeclRefExpr>(E) && | ||||||
7138 | cast<DeclRefExpr>(E)->refersToEnclosingVariableOrCapture()) { | ||||||
7139 | // We don't always have a complete capture-map when checking or inferring if | ||||||
7140 | // the function call operator meets the requirements of a constexpr function | ||||||
7141 | // - but we don't need to evaluate the captures to determine constexprness | ||||||
7142 | // (dcl.constexpr C++17). | ||||||
7143 | if (Info.checkingPotentialConstantExpression()) | ||||||
7144 | return false; | ||||||
7145 | |||||||
7146 | if (auto *FD = Info.CurrentCall->LambdaCaptureFields.lookup(VD)) { | ||||||
7147 | // Start with 'Result' referring to the complete closure object... | ||||||
7148 | Result = *Info.CurrentCall->This; | ||||||
7149 | // ... then update it to refer to the field of the closure object | ||||||
7150 | // that represents the capture. | ||||||
7151 | if (!HandleLValueMember(Info, E, Result, FD)) | ||||||
7152 | return false; | ||||||
7153 | // And if the field is of reference type, update 'Result' to refer to what | ||||||
7154 | // the field refers to. | ||||||
7155 | if (FD->getType()->isReferenceType()) { | ||||||
7156 | APValue RVal; | ||||||
7157 | if (!handleLValueToRValueConversion(Info, E, FD->getType(), Result, | ||||||
7158 | RVal)) | ||||||
7159 | return false; | ||||||
7160 | Result.setFrom(Info.Ctx, RVal); | ||||||
7161 | } | ||||||
7162 | return true; | ||||||
7163 | } | ||||||
7164 | } | ||||||
7165 | CallStackFrame *Frame = nullptr; | ||||||
7166 | if (VD->hasLocalStorage() && Info.CurrentCall->Index > 1) { | ||||||
7167 | // Only if a local variable was declared in the function currently being | ||||||
7168 | // evaluated, do we expect to be able to find its value in the current | ||||||
7169 | // frame. (Otherwise it was likely declared in an enclosing context and | ||||||
7170 | // could either have a valid evaluatable value (for e.g. a constexpr | ||||||
7171 | // variable) or be ill-formed (and trigger an appropriate evaluation | ||||||
7172 | // diagnostic)). | ||||||
7173 | if (Info.CurrentCall->Callee && | ||||||
7174 | Info.CurrentCall->Callee->Equals(VD->getDeclContext())) { | ||||||
7175 | Frame = Info.CurrentCall; | ||||||
7176 | } | ||||||
7177 | } | ||||||
7178 | |||||||
7179 | if (!VD->getType()->isReferenceType()) { | ||||||
7180 | if (Frame) { | ||||||
7181 | Result.set({VD, Frame->Index, | ||||||
7182 | Info.CurrentCall->getCurrentTemporaryVersion(VD)}); | ||||||
7183 | return true; | ||||||
7184 | } | ||||||
7185 | return Success(VD); | ||||||
7186 | } | ||||||
7187 | |||||||
7188 | APValue *V; | ||||||
7189 | if (!evaluateVarDeclInit(Info, E, VD, Frame, V, nullptr)) | ||||||
7190 | return false; | ||||||
7191 | if (!V->hasValue()) { | ||||||
7192 | // FIXME: Is it possible for V to be indeterminate here? If so, we should | ||||||
7193 | // adjust the diagnostic to say that. | ||||||
7194 | if (!Info.checkingPotentialConstantExpression()) | ||||||
7195 | Info.FFDiag(E, diag::note_constexpr_use_uninit_reference); | ||||||
7196 | return false; | ||||||
7197 | } | ||||||
7198 | return Success(*V, E); | ||||||
7199 | } | ||||||
7200 | |||||||
7201 | bool LValueExprEvaluator::VisitMaterializeTemporaryExpr( | ||||||
7202 | const MaterializeTemporaryExpr *E) { | ||||||
7203 | // Walk through the expression to find the materialized temporary itself. | ||||||
7204 | SmallVector<const Expr *, 2> CommaLHSs; | ||||||
7205 | SmallVector<SubobjectAdjustment, 2> Adjustments; | ||||||
7206 | const Expr *Inner = E->GetTemporaryExpr()-> | ||||||
7207 | skipRValueSubobjectAdjustments(CommaLHSs, Adjustments); | ||||||
7208 | |||||||
7209 | // If we passed any comma operators, evaluate their LHSs. | ||||||
7210 | for (unsigned I = 0, N = CommaLHSs.size(); I != N; ++I) | ||||||
7211 | if (!EvaluateIgnoredValue(Info, CommaLHSs[I])) | ||||||
7212 | return false; | ||||||
7213 | |||||||
7214 | // A materialized temporary with static storage duration can appear within the | ||||||
7215 | // result of a constant expression evaluation, so we need to preserve its | ||||||
7216 | // value for use outside this evaluation. | ||||||
7217 | APValue *Value; | ||||||
7218 | if (E->getStorageDuration() == SD_Static) { | ||||||
7219 | Value = Info.Ctx.getMaterializedTemporaryValue(E, true); | ||||||
7220 | *Value = APValue(); | ||||||
7221 | Result.set(E); | ||||||
7222 | } else { | ||||||
7223 | Value = &Info.CurrentCall->createTemporary( | ||||||
7224 | E, E->getType(), E->getStorageDuration() == SD_Automatic, Result); | ||||||
7225 | } | ||||||
7226 | |||||||
7227 | QualType Type = Inner->getType(); | ||||||
7228 | |||||||
7229 | // Materialize the temporary itself. | ||||||
7230 | if (!EvaluateInPlace(*Value, Info, Result, Inner)) { | ||||||
7231 | *Value = APValue(); | ||||||
7232 | return false; | ||||||
7233 | } | ||||||
7234 | |||||||
7235 | // Adjust our lvalue to refer to the desired subobject. | ||||||
7236 | for (unsigned I = Adjustments.size(); I != 0; /**/) { | ||||||
7237 | --I; | ||||||
7238 | switch (Adjustments[I].Kind) { | ||||||
7239 | case SubobjectAdjustment::DerivedToBaseAdjustment: | ||||||
7240 | if (!HandleLValueBasePath(Info, Adjustments[I].DerivedToBase.BasePath, | ||||||
7241 | Type, Result)) | ||||||
7242 | return false; | ||||||
7243 | Type = Adjustments[I].DerivedToBase.BasePath->getType(); | ||||||
7244 | break; | ||||||
7245 | |||||||
7246 | case SubobjectAdjustment::FieldAdjustment: | ||||||
7247 | if (!HandleLValueMember(Info, E, Result, Adjustments[I].Field)) | ||||||
7248 | return false; | ||||||
7249 | Type = Adjustments[I].Field->getType(); | ||||||
7250 | break; | ||||||
7251 | |||||||
7252 | case SubobjectAdjustment::MemberPointerAdjustment: | ||||||
7253 | if (!HandleMemberPointerAccess(this->Info, Type, Result, | ||||||
7254 | Adjustments[I].Ptr.RHS)) | ||||||
7255 | return false; | ||||||
7256 | Type = Adjustments[I].Ptr.MPT->getPointeeType(); | ||||||
7257 | break; | ||||||
7258 | } | ||||||
7259 | } | ||||||
7260 | |||||||
7261 | return true; | ||||||
7262 | } | ||||||
7263 | |||||||
7264 | bool | ||||||
7265 | LValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { | ||||||
7266 | assert((!Info.getLangOpts().CPlusPlus || E->isFileScope()) &&(((!Info.getLangOpts().CPlusPlus || E->isFileScope()) && "lvalue compound literal in c++?") ? static_cast<void> (0) : __assert_fail ("(!Info.getLangOpts().CPlusPlus || E->isFileScope()) && \"lvalue compound literal in c++?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7267, __PRETTY_FUNCTION__)) | ||||||
7267 | "lvalue compound literal in c++?")(((!Info.getLangOpts().CPlusPlus || E->isFileScope()) && "lvalue compound literal in c++?") ? static_cast<void> (0) : __assert_fail ("(!Info.getLangOpts().CPlusPlus || E->isFileScope()) && \"lvalue compound literal in c++?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7267, __PRETTY_FUNCTION__)); | ||||||
7268 | // Defer visiting the literal until the lvalue-to-rvalue conversion. We can | ||||||
7269 | // only see this when folding in C, so there's no standard to follow here. | ||||||
7270 | return Success(E); | ||||||
7271 | } | ||||||
7272 | |||||||
7273 | bool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { | ||||||
7274 | TypeInfoLValue TypeInfo; | ||||||
7275 | |||||||
7276 | if (!E->isPotentiallyEvaluated()) { | ||||||
7277 | if (E->isTypeOperand()) | ||||||
7278 | TypeInfo = TypeInfoLValue(E->getTypeOperand(Info.Ctx).getTypePtr()); | ||||||
7279 | else | ||||||
7280 | TypeInfo = TypeInfoLValue(E->getExprOperand()->getType().getTypePtr()); | ||||||
7281 | } else { | ||||||
7282 | if (!Info.Ctx.getLangOpts().CPlusPlus2a) { | ||||||
7283 | Info.CCEDiag(E, diag::note_constexpr_typeid_polymorphic) | ||||||
7284 | << E->getExprOperand()->getType() | ||||||
7285 | << E->getExprOperand()->getSourceRange(); | ||||||
7286 | } | ||||||
7287 | |||||||
7288 | if (!Visit(E->getExprOperand())) | ||||||
7289 | return false; | ||||||
7290 | |||||||
7291 | Optional<DynamicType> DynType = | ||||||
7292 | ComputeDynamicType(Info, E, Result, AK_TypeId); | ||||||
7293 | if (!DynType) | ||||||
7294 | return false; | ||||||
7295 | |||||||
7296 | TypeInfo = | ||||||
7297 | TypeInfoLValue(Info.Ctx.getRecordType(DynType->Type).getTypePtr()); | ||||||
7298 | } | ||||||
7299 | |||||||
7300 | return Success(APValue::LValueBase::getTypeInfo(TypeInfo, E->getType())); | ||||||
7301 | } | ||||||
7302 | |||||||
7303 | bool LValueExprEvaluator::VisitCXXUuidofExpr(const CXXUuidofExpr *E) { | ||||||
7304 | return Success(E); | ||||||
7305 | } | ||||||
7306 | |||||||
7307 | bool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { | ||||||
7308 | // Handle static data members. | ||||||
7309 | if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { | ||||||
7310 | VisitIgnoredBaseExpression(E->getBase()); | ||||||
7311 | return VisitVarDecl(E, VD); | ||||||
7312 | } | ||||||
7313 | |||||||
7314 | // Handle static member functions. | ||||||
7315 | if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { | ||||||
7316 | if (MD->isStatic()) { | ||||||
7317 | VisitIgnoredBaseExpression(E->getBase()); | ||||||
7318 | return Success(MD); | ||||||
7319 | } | ||||||
7320 | } | ||||||
7321 | |||||||
7322 | // Handle non-static data members. | ||||||
7323 | return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); | ||||||
7324 | } | ||||||
7325 | |||||||
7326 | bool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { | ||||||
7327 | // FIXME: Deal with vectors as array subscript bases. | ||||||
7328 | if (E->getBase()->getType()->isVectorType()) | ||||||
7329 | return Error(E); | ||||||
7330 | |||||||
7331 | bool Success = true; | ||||||
7332 | if (!evaluatePointer(E->getBase(), Result)) { | ||||||
7333 | if (!Info.noteFailure()) | ||||||
7334 | return false; | ||||||
7335 | Success = false; | ||||||
7336 | } | ||||||
7337 | |||||||
7338 | APSInt Index; | ||||||
7339 | if (!EvaluateInteger(E->getIdx(), Index, Info)) | ||||||
7340 | return false; | ||||||
7341 | |||||||
7342 | return Success && | ||||||
7343 | HandleLValueArrayAdjustment(Info, E, Result, E->getType(), Index); | ||||||
7344 | } | ||||||
7345 | |||||||
7346 | bool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { | ||||||
7347 | return evaluatePointer(E->getSubExpr(), Result); | ||||||
7348 | } | ||||||
7349 | |||||||
7350 | bool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { | ||||||
7351 | if (!Visit(E->getSubExpr())) | ||||||
7352 | return false; | ||||||
7353 | // __real is a no-op on scalar lvalues. | ||||||
7354 | if (E->getSubExpr()->getType()->isAnyComplexType()) | ||||||
7355 | HandleLValueComplexElement(Info, E, Result, E->getType(), false); | ||||||
7356 | return true; | ||||||
7357 | } | ||||||
7358 | |||||||
7359 | bool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { | ||||||
7360 | assert(E->getSubExpr()->getType()->isAnyComplexType() &&((E->getSubExpr()->getType()->isAnyComplexType() && "lvalue __imag__ on scalar?") ? static_cast<void> (0) : __assert_fail ("E->getSubExpr()->getType()->isAnyComplexType() && \"lvalue __imag__ on scalar?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7361, __PRETTY_FUNCTION__)) | ||||||
7361 | "lvalue __imag__ on scalar?")((E->getSubExpr()->getType()->isAnyComplexType() && "lvalue __imag__ on scalar?") ? static_cast<void> (0) : __assert_fail ("E->getSubExpr()->getType()->isAnyComplexType() && \"lvalue __imag__ on scalar?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7361, __PRETTY_FUNCTION__)); | ||||||
7362 | if (!Visit(E->getSubExpr())) | ||||||
7363 | return false; | ||||||
7364 | HandleLValueComplexElement(Info, E, Result, E->getType(), true); | ||||||
7365 | return true; | ||||||
7366 | } | ||||||
7367 | |||||||
7368 | bool LValueExprEvaluator::VisitUnaryPreIncDec(const UnaryOperator *UO) { | ||||||
7369 | if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure()) | ||||||
7370 | return Error(UO); | ||||||
7371 | |||||||
7372 | if (!this->Visit(UO->getSubExpr())) | ||||||
7373 | return false; | ||||||
7374 | |||||||
7375 | return handleIncDec( | ||||||
7376 | this->Info, UO, Result, UO->getSubExpr()->getType(), | ||||||
7377 | UO->isIncrementOp(), nullptr); | ||||||
7378 | } | ||||||
7379 | |||||||
7380 | bool LValueExprEvaluator::VisitCompoundAssignOperator( | ||||||
7381 | const CompoundAssignOperator *CAO) { | ||||||
7382 | if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure()) | ||||||
7383 | return Error(CAO); | ||||||
7384 | |||||||
7385 | APValue RHS; | ||||||
7386 | |||||||
7387 | // The overall lvalue result is the result of evaluating the LHS. | ||||||
7388 | if (!this->Visit(CAO->getLHS())) { | ||||||
7389 | if (Info.noteFailure()) | ||||||
7390 | Evaluate(RHS, this->Info, CAO->getRHS()); | ||||||
7391 | return false; | ||||||
7392 | } | ||||||
7393 | |||||||
7394 | if (!Evaluate(RHS, this->Info, CAO->getRHS())) | ||||||
7395 | return false; | ||||||
7396 | |||||||
7397 | return handleCompoundAssignment( | ||||||
7398 | this->Info, CAO, | ||||||
7399 | Result, CAO->getLHS()->getType(), CAO->getComputationLHSType(), | ||||||
7400 | CAO->getOpForCompoundAssignment(CAO->getOpcode()), RHS); | ||||||
7401 | } | ||||||
7402 | |||||||
7403 | bool LValueExprEvaluator::VisitBinAssign(const BinaryOperator *E) { | ||||||
7404 | if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure()) | ||||||
7405 | return Error(E); | ||||||
7406 | |||||||
7407 | APValue NewVal; | ||||||
7408 | |||||||
7409 | if (!this->Visit(E->getLHS())) { | ||||||
7410 | if (Info.noteFailure()) | ||||||
7411 | Evaluate(NewVal, this->Info, E->getRHS()); | ||||||
7412 | return false; | ||||||
7413 | } | ||||||
7414 | |||||||
7415 | if (!Evaluate(NewVal, this->Info, E->getRHS())) | ||||||
7416 | return false; | ||||||
7417 | |||||||
7418 | if (Info.getLangOpts().CPlusPlus2a && | ||||||
7419 | !HandleUnionActiveMemberChange(Info, E->getLHS(), Result)) | ||||||
7420 | return false; | ||||||
7421 | |||||||
7422 | return handleAssignment(this->Info, E, Result, E->getLHS()->getType(), | ||||||
7423 | NewVal); | ||||||
7424 | } | ||||||
7425 | |||||||
7426 | //===----------------------------------------------------------------------===// | ||||||
7427 | // Pointer Evaluation | ||||||
7428 | //===----------------------------------------------------------------------===// | ||||||
7429 | |||||||
7430 | /// Attempts to compute the number of bytes available at the pointer | ||||||
7431 | /// returned by a function with the alloc_size attribute. Returns true if we | ||||||
7432 | /// were successful. Places an unsigned number into `Result`. | ||||||
7433 | /// | ||||||
7434 | /// This expects the given CallExpr to be a call to a function with an | ||||||
7435 | /// alloc_size attribute. | ||||||
7436 | static bool getBytesReturnedByAllocSizeCall(const ASTContext &Ctx, | ||||||
7437 | const CallExpr *Call, | ||||||
7438 | llvm::APInt &Result) { | ||||||
7439 | const AllocSizeAttr *AllocSize = getAllocSizeAttr(Call); | ||||||
7440 | |||||||
7441 | assert(AllocSize && AllocSize->getElemSizeParam().isValid())((AllocSize && AllocSize->getElemSizeParam().isValid ()) ? static_cast<void> (0) : __assert_fail ("AllocSize && AllocSize->getElemSizeParam().isValid()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7441, __PRETTY_FUNCTION__)); | ||||||
7442 | unsigned SizeArgNo = AllocSize->getElemSizeParam().getASTIndex(); | ||||||
7443 | unsigned BitsInSizeT = Ctx.getTypeSize(Ctx.getSizeType()); | ||||||
7444 | if (Call->getNumArgs() <= SizeArgNo) | ||||||
7445 | return false; | ||||||
7446 | |||||||
7447 | auto EvaluateAsSizeT = [&](const Expr *E, APSInt &Into) { | ||||||
7448 | Expr::EvalResult ExprResult; | ||||||
7449 | if (!E->EvaluateAsInt(ExprResult, Ctx, Expr::SE_AllowSideEffects)) | ||||||
7450 | return false; | ||||||
7451 | Into = ExprResult.Val.getInt(); | ||||||
7452 | if (Into.isNegative() || !Into.isIntN(BitsInSizeT)) | ||||||
7453 | return false; | ||||||
7454 | Into = Into.zextOrSelf(BitsInSizeT); | ||||||
7455 | return true; | ||||||
7456 | }; | ||||||
7457 | |||||||
7458 | APSInt SizeOfElem; | ||||||
7459 | if (!EvaluateAsSizeT(Call->getArg(SizeArgNo), SizeOfElem)) | ||||||
7460 | return false; | ||||||
7461 | |||||||
7462 | if (!AllocSize->getNumElemsParam().isValid()) { | ||||||
7463 | Result = std::move(SizeOfElem); | ||||||
7464 | return true; | ||||||
7465 | } | ||||||
7466 | |||||||
7467 | APSInt NumberOfElems; | ||||||
7468 | unsigned NumArgNo = AllocSize->getNumElemsParam().getASTIndex(); | ||||||
7469 | if (!EvaluateAsSizeT(Call->getArg(NumArgNo), NumberOfElems)) | ||||||
7470 | return false; | ||||||
7471 | |||||||
7472 | bool Overflow; | ||||||
7473 | llvm::APInt BytesAvailable = SizeOfElem.umul_ov(NumberOfElems, Overflow); | ||||||
7474 | if (Overflow) | ||||||
7475 | return false; | ||||||
7476 | |||||||
7477 | Result = std::move(BytesAvailable); | ||||||
7478 | return true; | ||||||
7479 | } | ||||||
7480 | |||||||
7481 | /// Convenience function. LVal's base must be a call to an alloc_size | ||||||
7482 | /// function. | ||||||
7483 | static bool getBytesReturnedByAllocSizeCall(const ASTContext &Ctx, | ||||||
7484 | const LValue &LVal, | ||||||
7485 | llvm::APInt &Result) { | ||||||
7486 | assert(isBaseAnAllocSizeCall(LVal.getLValueBase()) &&((isBaseAnAllocSizeCall(LVal.getLValueBase()) && "Can't get the size of a non alloc_size function" ) ? static_cast<void> (0) : __assert_fail ("isBaseAnAllocSizeCall(LVal.getLValueBase()) && \"Can't get the size of a non alloc_size function\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7487, __PRETTY_FUNCTION__)) | ||||||
7487 | "Can't get the size of a non alloc_size function")((isBaseAnAllocSizeCall(LVal.getLValueBase()) && "Can't get the size of a non alloc_size function" ) ? static_cast<void> (0) : __assert_fail ("isBaseAnAllocSizeCall(LVal.getLValueBase()) && \"Can't get the size of a non alloc_size function\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7487, __PRETTY_FUNCTION__)); | ||||||
7488 | const auto *Base = LVal.getLValueBase().get<const Expr *>(); | ||||||
7489 | const CallExpr *CE = tryUnwrapAllocSizeCall(Base); | ||||||
7490 | return getBytesReturnedByAllocSizeCall(Ctx, CE, Result); | ||||||
7491 | } | ||||||
7492 | |||||||
7493 | /// Attempts to evaluate the given LValueBase as the result of a call to | ||||||
7494 | /// a function with the alloc_size attribute. If it was possible to do so, this | ||||||
7495 | /// function will return true, make Result's Base point to said function call, | ||||||
7496 | /// and mark Result's Base as invalid. | ||||||
7497 | static bool evaluateLValueAsAllocSize(EvalInfo &Info, APValue::LValueBase Base, | ||||||
7498 | LValue &Result) { | ||||||
7499 | if (Base.isNull()) | ||||||
7500 | return false; | ||||||
7501 | |||||||
7502 | // Because we do no form of static analysis, we only support const variables. | ||||||
7503 | // | ||||||
7504 | // Additionally, we can't support parameters, nor can we support static | ||||||
7505 | // variables (in the latter case, use-before-assign isn't UB; in the former, | ||||||
7506 | // we have no clue what they'll be assigned to). | ||||||
7507 | const auto *VD = | ||||||
7508 | dyn_cast_or_null<VarDecl>(Base.dyn_cast<const ValueDecl *>()); | ||||||
7509 | if (!VD || !VD->isLocalVarDecl() || !VD->getType().isConstQualified()) | ||||||
7510 | return false; | ||||||
7511 | |||||||
7512 | const Expr *Init = VD->getAnyInitializer(); | ||||||
7513 | if (!Init) | ||||||
7514 | return false; | ||||||
7515 | |||||||
7516 | const Expr *E = Init->IgnoreParens(); | ||||||
7517 | if (!tryUnwrapAllocSizeCall(E)) | ||||||
7518 | return false; | ||||||
7519 | |||||||
7520 | // Store E instead of E unwrapped so that the type of the LValue's base is | ||||||
7521 | // what the user wanted. | ||||||
7522 | Result.setInvalid(E); | ||||||
7523 | |||||||
7524 | QualType Pointee = E->getType()->castAs<PointerType>()->getPointeeType(); | ||||||
7525 | Result.addUnsizedArray(Info, E, Pointee); | ||||||
7526 | return true; | ||||||
7527 | } | ||||||
7528 | |||||||
7529 | namespace { | ||||||
7530 | class PointerExprEvaluator | ||||||
7531 | : public ExprEvaluatorBase<PointerExprEvaluator> { | ||||||
7532 | LValue &Result; | ||||||
7533 | bool InvalidBaseOK; | ||||||
7534 | |||||||
7535 | bool Success(const Expr *E) { | ||||||
7536 | Result.set(E); | ||||||
7537 | return true; | ||||||
7538 | } | ||||||
7539 | |||||||
7540 | bool evaluateLValue(const Expr *E, LValue &Result) { | ||||||
7541 | return EvaluateLValue(E, Result, Info, InvalidBaseOK); | ||||||
7542 | } | ||||||
7543 | |||||||
7544 | bool evaluatePointer(const Expr *E, LValue &Result) { | ||||||
7545 | return EvaluatePointer(E, Result, Info, InvalidBaseOK); | ||||||
7546 | } | ||||||
7547 | |||||||
7548 | bool visitNonBuiltinCallExpr(const CallExpr *E); | ||||||
7549 | public: | ||||||
7550 | |||||||
7551 | PointerExprEvaluator(EvalInfo &info, LValue &Result, bool InvalidBaseOK) | ||||||
7552 | : ExprEvaluatorBaseTy(info), Result(Result), | ||||||
7553 | InvalidBaseOK(InvalidBaseOK) {} | ||||||
7554 | |||||||
7555 | bool Success(const APValue &V, const Expr *E) { | ||||||
7556 | Result.setFrom(Info.Ctx, V); | ||||||
7557 | return true; | ||||||
7558 | } | ||||||
7559 | bool ZeroInitialization(const Expr *E) { | ||||||
7560 | auto TargetVal = Info.Ctx.getTargetNullPointerValue(E->getType()); | ||||||
7561 | Result.setNull(E->getType(), TargetVal); | ||||||
7562 | return true; | ||||||
7563 | } | ||||||
7564 | |||||||
7565 | bool VisitBinaryOperator(const BinaryOperator *E); | ||||||
7566 | bool VisitCastExpr(const CastExpr* E); | ||||||
7567 | bool VisitUnaryAddrOf(const UnaryOperator *E); | ||||||
7568 | bool VisitObjCStringLiteral(const ObjCStringLiteral *E) | ||||||
7569 | { return Success(E); } | ||||||
7570 | bool VisitObjCBoxedExpr(const ObjCBoxedExpr *E) { | ||||||
7571 | if (E->isExpressibleAsConstantInitializer()) | ||||||
7572 | return Success(E); | ||||||
7573 | if (Info.noteFailure()) | ||||||
7574 | EvaluateIgnoredValue(Info, E->getSubExpr()); | ||||||
7575 | return Error(E); | ||||||
7576 | } | ||||||
7577 | bool VisitAddrLabelExpr(const AddrLabelExpr *E) | ||||||
7578 | { return Success(E); } | ||||||
7579 | bool VisitCallExpr(const CallExpr *E); | ||||||
7580 | bool VisitBuiltinCallExpr(const CallExpr *E, unsigned BuiltinOp); | ||||||
7581 | bool VisitBlockExpr(const BlockExpr *E) { | ||||||
7582 | if (!E->getBlockDecl()->hasCaptures()) | ||||||
7583 | return Success(E); | ||||||
7584 | return Error(E); | ||||||
7585 | } | ||||||
7586 | bool VisitCXXThisExpr(const CXXThisExpr *E) { | ||||||
7587 | // Can't look at 'this' when checking a potential constant expression. | ||||||
7588 | if (Info.checkingPotentialConstantExpression()) | ||||||
7589 | return false; | ||||||
7590 | if (!Info.CurrentCall->This) { | ||||||
7591 | if (Info.getLangOpts().CPlusPlus11) | ||||||
7592 | Info.FFDiag(E, diag::note_constexpr_this) << E->isImplicit(); | ||||||
7593 | else | ||||||
7594 | Info.FFDiag(E); | ||||||
7595 | return false; | ||||||
7596 | } | ||||||
7597 | Result = *Info.CurrentCall->This; | ||||||
7598 | // If we are inside a lambda's call operator, the 'this' expression refers | ||||||
7599 | // to the enclosing '*this' object (either by value or reference) which is | ||||||
7600 | // either copied into the closure object's field that represents the '*this' | ||||||
7601 | // or refers to '*this'. | ||||||
7602 | if (isLambdaCallOperator(Info.CurrentCall->Callee)) { | ||||||
7603 | // Update 'Result' to refer to the data member/field of the closure object | ||||||
7604 | // that represents the '*this' capture. | ||||||
7605 | if (!HandleLValueMember(Info, E, Result, | ||||||
7606 | Info.CurrentCall->LambdaThisCaptureField)) | ||||||
7607 | return false; | ||||||
7608 | // If we captured '*this' by reference, replace the field with its referent. | ||||||
7609 | if (Info.CurrentCall->LambdaThisCaptureField->getType() | ||||||
7610 | ->isPointerType()) { | ||||||
7611 | APValue RVal; | ||||||
7612 | if (!handleLValueToRValueConversion(Info, E, E->getType(), Result, | ||||||
7613 | RVal)) | ||||||
7614 | return false; | ||||||
7615 | |||||||
7616 | Result.setFrom(Info.Ctx, RVal); | ||||||
7617 | } | ||||||
7618 | } | ||||||
7619 | return true; | ||||||
7620 | } | ||||||
7621 | |||||||
7622 | bool VisitCXXNewExpr(const CXXNewExpr *E); | ||||||
7623 | |||||||
7624 | bool VisitSourceLocExpr(const SourceLocExpr *E) { | ||||||
7625 | assert(E->isStringType() && "SourceLocExpr isn't a pointer type?")((E->isStringType() && "SourceLocExpr isn't a pointer type?" ) ? static_cast<void> (0) : __assert_fail ("E->isStringType() && \"SourceLocExpr isn't a pointer type?\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7625, __PRETTY_FUNCTION__)); | ||||||
7626 | APValue LValResult = E->EvaluateInContext( | ||||||
7627 | Info.Ctx, Info.CurrentCall->CurSourceLocExprScope.getDefaultExpr()); | ||||||
7628 | Result.setFrom(Info.Ctx, LValResult); | ||||||
7629 | return true; | ||||||
7630 | } | ||||||
7631 | |||||||
7632 | // FIXME: Missing: @protocol, @selector | ||||||
7633 | }; | ||||||
7634 | } // end anonymous namespace | ||||||
7635 | |||||||
7636 | static bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info, | ||||||
7637 | bool InvalidBaseOK) { | ||||||
7638 | assert(E->isRValue() && E->getType()->hasPointerRepresentation())((E->isRValue() && E->getType()->hasPointerRepresentation ()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->hasPointerRepresentation()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7638, __PRETTY_FUNCTION__)); | ||||||
7639 | return PointerExprEvaluator(Info, Result, InvalidBaseOK).Visit(E); | ||||||
7640 | } | ||||||
7641 | |||||||
7642 | bool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | ||||||
7643 | if (E->getOpcode() != BO_Add && | ||||||
7644 | E->getOpcode() != BO_Sub) | ||||||
7645 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | ||||||
7646 | |||||||
7647 | const Expr *PExp = E->getLHS(); | ||||||
7648 | const Expr *IExp = E->getRHS(); | ||||||
7649 | if (IExp->getType()->isPointerType()) | ||||||
7650 | std::swap(PExp, IExp); | ||||||
7651 | |||||||
7652 | bool EvalPtrOK = evaluatePointer(PExp, Result); | ||||||
7653 | if (!EvalPtrOK && !Info.noteFailure()) | ||||||
7654 | return false; | ||||||
7655 | |||||||
7656 | llvm::APSInt Offset; | ||||||
7657 | if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) | ||||||
7658 | return false; | ||||||
7659 | |||||||
7660 | if (E->getOpcode() == BO_Sub) | ||||||
7661 | negateAsSigned(Offset); | ||||||
7662 | |||||||
7663 | QualType Pointee = PExp->getType()->castAs<PointerType>()->getPointeeType(); | ||||||
7664 | return HandleLValueArrayAdjustment(Info, E, Result, Pointee, Offset); | ||||||
7665 | } | ||||||
7666 | |||||||
7667 | bool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { | ||||||
7668 | return evaluateLValue(E->getSubExpr(), Result); | ||||||
7669 | } | ||||||
7670 | |||||||
7671 | bool PointerExprEvaluator::VisitCastExpr(const CastExpr *E) { | ||||||
7672 | const Expr *SubExpr = E->getSubExpr(); | ||||||
7673 | |||||||
7674 | switch (E->getCastKind()) { | ||||||
7675 | default: | ||||||
7676 | break; | ||||||
7677 | case CK_BitCast: | ||||||
7678 | case CK_CPointerToObjCPointerCast: | ||||||
7679 | case CK_BlockPointerToObjCPointerCast: | ||||||
7680 | case CK_AnyPointerToBlockPointerCast: | ||||||
7681 | case CK_AddressSpaceConversion: | ||||||
7682 | if (!Visit(SubExpr)) | ||||||
7683 | return false; | ||||||
7684 | // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are | ||||||
7685 | // permitted in constant expressions in C++11. Bitcasts from cv void* are | ||||||
7686 | // also static_casts, but we disallow them as a resolution to DR1312. | ||||||
7687 | if (!E->getType()->isVoidPointerType()) { | ||||||
7688 | Result.Designator.setInvalid(); | ||||||
7689 | if (SubExpr->getType()->isVoidPointerType()) | ||||||
7690 | CCEDiag(E, diag::note_constexpr_invalid_cast) | ||||||
7691 | << 3 << SubExpr->getType(); | ||||||
7692 | else | ||||||
7693 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; | ||||||
7694 | } | ||||||
7695 | if (E->getCastKind() == CK_AddressSpaceConversion && Result.IsNullPtr) | ||||||
7696 | ZeroInitialization(E); | ||||||
7697 | return true; | ||||||
7698 | |||||||
7699 | case CK_DerivedToBase: | ||||||
7700 | case CK_UncheckedDerivedToBase: | ||||||
7701 | if (!evaluatePointer(E->getSubExpr(), Result)) | ||||||
7702 | return false; | ||||||
7703 | if (!Result.Base && Result.Offset.isZero()) | ||||||
7704 | return true; | ||||||
7705 | |||||||
7706 | // Now figure out the necessary offset to add to the base LV to get from | ||||||
7707 | // the derived class to the base class. | ||||||
7708 | return HandleLValueBasePath(Info, E, E->getSubExpr()->getType()-> | ||||||
7709 | castAs<PointerType>()->getPointeeType(), | ||||||
7710 | Result); | ||||||
7711 | |||||||
7712 | case CK_BaseToDerived: | ||||||
7713 | if (!Visit(E->getSubExpr())) | ||||||
7714 | return false; | ||||||
7715 | if (!Result.Base && Result.Offset.isZero()) | ||||||
7716 | return true; | ||||||
7717 | return HandleBaseToDerivedCast(Info, E, Result); | ||||||
7718 | |||||||
7719 | case CK_Dynamic: | ||||||
7720 | if (!Visit(E->getSubExpr())) | ||||||
7721 | return false; | ||||||
7722 | return HandleDynamicCast(Info, cast<ExplicitCastExpr>(E), Result); | ||||||
7723 | |||||||
7724 | case CK_NullToPointer: | ||||||
7725 | VisitIgnoredValue(E->getSubExpr()); | ||||||
7726 | return ZeroInitialization(E); | ||||||
7727 | |||||||
7728 | case CK_IntegralToPointer: { | ||||||
7729 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; | ||||||
7730 | |||||||
7731 | APValue Value; | ||||||
7732 | if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) | ||||||
7733 | break; | ||||||
7734 | |||||||
7735 | if (Value.isInt()) { | ||||||
7736 | unsigned Size = Info.Ctx.getTypeSize(E->getType()); | ||||||
7737 | uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); | ||||||
7738 | Result.Base = (Expr*)nullptr; | ||||||
7739 | Result.InvalidBase = false; | ||||||
7740 | Result.Offset = CharUnits::fromQuantity(N); | ||||||
7741 | Result.Designator.setInvalid(); | ||||||
7742 | Result.IsNullPtr = false; | ||||||
7743 | return true; | ||||||
7744 | } else { | ||||||
7745 | // Cast is of an lvalue, no need to change value. | ||||||
7746 | Result.setFrom(Info.Ctx, Value); | ||||||
7747 | return true; | ||||||
7748 | } | ||||||
7749 | } | ||||||
7750 | |||||||
7751 | case CK_ArrayToPointerDecay: { | ||||||
7752 | if (SubExpr->isGLValue()) { | ||||||
7753 | if (!evaluateLValue(SubExpr, Result)) | ||||||
7754 | return false; | ||||||
7755 | } else { | ||||||
7756 | APValue &Value = Info.CurrentCall->createTemporary( | ||||||
7757 | SubExpr, SubExpr->getType(), false, Result); | ||||||
7758 | if (!EvaluateInPlace(Value, Info, Result, SubExpr)) | ||||||
7759 | return false; | ||||||
7760 | } | ||||||
7761 | // The result is a pointer to the first element of the array. | ||||||
7762 | auto *AT = Info.Ctx.getAsArrayType(SubExpr->getType()); | ||||||
7763 | if (auto *CAT = dyn_cast<ConstantArrayType>(AT)) | ||||||
7764 | Result.addArray(Info, E, CAT); | ||||||
7765 | else | ||||||
7766 | Result.addUnsizedArray(Info, E, AT->getElementType()); | ||||||
7767 | return true; | ||||||
7768 | } | ||||||
7769 | |||||||
7770 | case CK_FunctionToPointerDecay: | ||||||
7771 | return evaluateLValue(SubExpr, Result); | ||||||
7772 | |||||||
7773 | case CK_LValueToRValue: { | ||||||
7774 | LValue LVal; | ||||||
7775 | if (!evaluateLValue(E->getSubExpr(), LVal)) | ||||||
7776 | return false; | ||||||
7777 | |||||||
7778 | APValue RVal; | ||||||
7779 | // Note, we use the subexpression's type in order to retain cv-qualifiers. | ||||||
7780 | if (!handleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), | ||||||
7781 | LVal, RVal)) | ||||||
7782 | return InvalidBaseOK && | ||||||
7783 | evaluateLValueAsAllocSize(Info, LVal.Base, Result); | ||||||
7784 | return Success(RVal, E); | ||||||
7785 | } | ||||||
7786 | } | ||||||
7787 | |||||||
7788 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
7789 | } | ||||||
7790 | |||||||
7791 | static CharUnits GetAlignOfType(EvalInfo &Info, QualType T, | ||||||
7792 | UnaryExprOrTypeTrait ExprKind) { | ||||||
7793 | // C++ [expr.alignof]p3: | ||||||
7794 | // When alignof is applied to a reference type, the result is the | ||||||
7795 | // alignment of the referenced type. | ||||||
7796 | if (const ReferenceType *Ref = T->getAs<ReferenceType>()) | ||||||
7797 | T = Ref->getPointeeType(); | ||||||
7798 | |||||||
7799 | if (T.getQualifiers().hasUnaligned()) | ||||||
7800 | return CharUnits::One(); | ||||||
7801 | |||||||
7802 | const bool AlignOfReturnsPreferred = | ||||||
7803 | Info.Ctx.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver7; | ||||||
7804 | |||||||
7805 | // __alignof is defined to return the preferred alignment. | ||||||
7806 | // Before 8, clang returned the preferred alignment for alignof and _Alignof | ||||||
7807 | // as well. | ||||||
7808 | if (ExprKind == UETT_PreferredAlignOf || AlignOfReturnsPreferred) | ||||||
7809 | return Info.Ctx.toCharUnitsFromBits( | ||||||
7810 | Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); | ||||||
7811 | // alignof and _Alignof are defined to return the ABI alignment. | ||||||
7812 | else if (ExprKind == UETT_AlignOf) | ||||||
7813 | return Info.Ctx.getTypeAlignInChars(T.getTypePtr()); | ||||||
7814 | else | ||||||
7815 | llvm_unreachable("GetAlignOfType on a non-alignment ExprKind")::llvm::llvm_unreachable_internal("GetAlignOfType on a non-alignment ExprKind" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7815); | ||||||
7816 | } | ||||||
7817 | |||||||
7818 | static CharUnits GetAlignOfExpr(EvalInfo &Info, const Expr *E, | ||||||
7819 | UnaryExprOrTypeTrait ExprKind) { | ||||||
7820 | E = E->IgnoreParens(); | ||||||
7821 | |||||||
7822 | // The kinds of expressions that we have special-case logic here for | ||||||
7823 | // should be kept up to date with the special checks for those | ||||||
7824 | // expressions in Sema. | ||||||
7825 | |||||||
7826 | // alignof decl is always accepted, even if it doesn't make sense: we default | ||||||
7827 | // to 1 in those cases. | ||||||
7828 | if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) | ||||||
7829 | return Info.Ctx.getDeclAlign(DRE->getDecl(), | ||||||
7830 | /*RefAsPointee*/true); | ||||||
7831 | |||||||
7832 | if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) | ||||||
7833 | return Info.Ctx.getDeclAlign(ME->getMemberDecl(), | ||||||
7834 | /*RefAsPointee*/true); | ||||||
7835 | |||||||
7836 | return GetAlignOfType(Info, E->getType(), ExprKind); | ||||||
7837 | } | ||||||
7838 | |||||||
7839 | // To be clear: this happily visits unsupported builtins. Better name welcomed. | ||||||
7840 | bool PointerExprEvaluator::visitNonBuiltinCallExpr(const CallExpr *E) { | ||||||
7841 | if (ExprEvaluatorBaseTy::VisitCallExpr(E)) | ||||||
7842 | return true; | ||||||
7843 | |||||||
7844 | if (!(InvalidBaseOK && getAllocSizeAttr(E))) | ||||||
7845 | return false; | ||||||
7846 | |||||||
7847 | Result.setInvalid(E); | ||||||
7848 | QualType PointeeTy = E->getType()->castAs<PointerType>()->getPointeeType(); | ||||||
7849 | Result.addUnsizedArray(Info, E, PointeeTy); | ||||||
7850 | return true; | ||||||
7851 | } | ||||||
7852 | |||||||
7853 | bool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { | ||||||
7854 | if (IsStringLiteralCall(E)) | ||||||
7855 | return Success(E); | ||||||
7856 | |||||||
7857 | if (unsigned BuiltinOp = E->getBuiltinCallee()) | ||||||
7858 | return VisitBuiltinCallExpr(E, BuiltinOp); | ||||||
7859 | |||||||
7860 | return visitNonBuiltinCallExpr(E); | ||||||
7861 | } | ||||||
7862 | |||||||
7863 | bool PointerExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E, | ||||||
7864 | unsigned BuiltinOp) { | ||||||
7865 | switch (BuiltinOp) { | ||||||
7866 | case Builtin::BI__builtin_addressof: | ||||||
7867 | return evaluateLValue(E->getArg(0), Result); | ||||||
7868 | case Builtin::BI__builtin_assume_aligned: { | ||||||
7869 | // We need to be very careful here because: if the pointer does not have the | ||||||
7870 | // asserted alignment, then the behavior is undefined, and undefined | ||||||
7871 | // behavior is non-constant. | ||||||
7872 | if (!evaluatePointer(E->getArg(0), Result)) | ||||||
7873 | return false; | ||||||
7874 | |||||||
7875 | LValue OffsetResult(Result); | ||||||
7876 | APSInt Alignment; | ||||||
7877 | if (!EvaluateInteger(E->getArg(1), Alignment, Info)) | ||||||
7878 | return false; | ||||||
7879 | CharUnits Align = CharUnits::fromQuantity(Alignment.getZExtValue()); | ||||||
7880 | |||||||
7881 | if (E->getNumArgs() > 2) { | ||||||
7882 | APSInt Offset; | ||||||
7883 | if (!EvaluateInteger(E->getArg(2), Offset, Info)) | ||||||
7884 | return false; | ||||||
7885 | |||||||
7886 | int64_t AdditionalOffset = -Offset.getZExtValue(); | ||||||
7887 | OffsetResult.Offset += CharUnits::fromQuantity(AdditionalOffset); | ||||||
7888 | } | ||||||
7889 | |||||||
7890 | // If there is a base object, then it must have the correct alignment. | ||||||
7891 | if (OffsetResult.Base) { | ||||||
7892 | CharUnits BaseAlignment; | ||||||
7893 | if (const ValueDecl *VD = | ||||||
7894 | OffsetResult.Base.dyn_cast<const ValueDecl*>()) { | ||||||
7895 | BaseAlignment = Info.Ctx.getDeclAlign(VD); | ||||||
7896 | } else if (const Expr *E = OffsetResult.Base.dyn_cast<const Expr *>()) { | ||||||
7897 | BaseAlignment = GetAlignOfExpr(Info, E, UETT_AlignOf); | ||||||
7898 | } else { | ||||||
7899 | BaseAlignment = GetAlignOfType( | ||||||
7900 | Info, OffsetResult.Base.getTypeInfoType(), UETT_AlignOf); | ||||||
7901 | } | ||||||
7902 | |||||||
7903 | if (BaseAlignment < Align) { | ||||||
7904 | Result.Designator.setInvalid(); | ||||||
7905 | // FIXME: Add support to Diagnostic for long / long long. | ||||||
7906 | CCEDiag(E->getArg(0), | ||||||
7907 | diag::note_constexpr_baa_insufficient_alignment) << 0 | ||||||
7908 | << (unsigned)BaseAlignment.getQuantity() | ||||||
7909 | << (unsigned)Align.getQuantity(); | ||||||
7910 | return false; | ||||||
7911 | } | ||||||
7912 | } | ||||||
7913 | |||||||
7914 | // The offset must also have the correct alignment. | ||||||
7915 | if (OffsetResult.Offset.alignTo(Align) != OffsetResult.Offset) { | ||||||
7916 | Result.Designator.setInvalid(); | ||||||
7917 | |||||||
7918 | (OffsetResult.Base | ||||||
7919 | ? CCEDiag(E->getArg(0), | ||||||
7920 | diag::note_constexpr_baa_insufficient_alignment) << 1 | ||||||
7921 | : CCEDiag(E->getArg(0), | ||||||
7922 | diag::note_constexpr_baa_value_insufficient_alignment)) | ||||||
7923 | << (int)OffsetResult.Offset.getQuantity() | ||||||
7924 | << (unsigned)Align.getQuantity(); | ||||||
7925 | return false; | ||||||
7926 | } | ||||||
7927 | |||||||
7928 | return true; | ||||||
7929 | } | ||||||
7930 | case Builtin::BI__builtin_launder: | ||||||
7931 | return evaluatePointer(E->getArg(0), Result); | ||||||
7932 | case Builtin::BIstrchr: | ||||||
7933 | case Builtin::BIwcschr: | ||||||
7934 | case Builtin::BImemchr: | ||||||
7935 | case Builtin::BIwmemchr: | ||||||
7936 | if (Info.getLangOpts().CPlusPlus11) | ||||||
7937 | Info.CCEDiag(E, diag::note_constexpr_invalid_function) | ||||||
7938 | << /*isConstexpr*/0 << /*isConstructor*/0 | ||||||
7939 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'"); | ||||||
7940 | else | ||||||
7941 | Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
7942 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||||
7943 | case Builtin::BI__builtin_strchr: | ||||||
7944 | case Builtin::BI__builtin_wcschr: | ||||||
7945 | case Builtin::BI__builtin_memchr: | ||||||
7946 | case Builtin::BI__builtin_char_memchr: | ||||||
7947 | case Builtin::BI__builtin_wmemchr: { | ||||||
7948 | if (!Visit(E->getArg(0))) | ||||||
7949 | return false; | ||||||
7950 | APSInt Desired; | ||||||
7951 | if (!EvaluateInteger(E->getArg(1), Desired, Info)) | ||||||
7952 | return false; | ||||||
7953 | uint64_t MaxLength = uint64_t(-1); | ||||||
7954 | if (BuiltinOp != Builtin::BIstrchr && | ||||||
7955 | BuiltinOp != Builtin::BIwcschr && | ||||||
7956 | BuiltinOp != Builtin::BI__builtin_strchr && | ||||||
7957 | BuiltinOp != Builtin::BI__builtin_wcschr) { | ||||||
7958 | APSInt N; | ||||||
7959 | if (!EvaluateInteger(E->getArg(2), N, Info)) | ||||||
7960 | return false; | ||||||
7961 | MaxLength = N.getExtValue(); | ||||||
7962 | } | ||||||
7963 | // We cannot find the value if there are no candidates to match against. | ||||||
7964 | if (MaxLength == 0u) | ||||||
7965 | return ZeroInitialization(E); | ||||||
7966 | if (!Result.checkNullPointerForFoldAccess(Info, E, AK_Read) || | ||||||
7967 | Result.Designator.Invalid) | ||||||
7968 | return false; | ||||||
7969 | QualType CharTy = Result.Designator.getType(Info.Ctx); | ||||||
7970 | bool IsRawByte = BuiltinOp == Builtin::BImemchr || | ||||||
7971 | BuiltinOp == Builtin::BI__builtin_memchr; | ||||||
7972 | assert(IsRawByte ||((IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E-> getArg(0)->getType()->getPointeeType())) ? static_cast< void> (0) : __assert_fail ("IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->getArg(0)->getType()->getPointeeType())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7974, __PRETTY_FUNCTION__)) | ||||||
7973 | Info.Ctx.hasSameUnqualifiedType(((IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E-> getArg(0)->getType()->getPointeeType())) ? static_cast< void> (0) : __assert_fail ("IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->getArg(0)->getType()->getPointeeType())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7974, __PRETTY_FUNCTION__)) | ||||||
7974 | CharTy, E->getArg(0)->getType()->getPointeeType()))((IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E-> getArg(0)->getType()->getPointeeType())) ? static_cast< void> (0) : __assert_fail ("IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->getArg(0)->getType()->getPointeeType())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 7974, __PRETTY_FUNCTION__)); | ||||||
7975 | // Pointers to const void may point to objects of incomplete type. | ||||||
7976 | if (IsRawByte && CharTy->isIncompleteType()) { | ||||||
7977 | Info.FFDiag(E, diag::note_constexpr_ltor_incomplete_type) << CharTy; | ||||||
7978 | return false; | ||||||
7979 | } | ||||||
7980 | // Give up on byte-oriented matching against multibyte elements. | ||||||
7981 | // FIXME: We can compare the bytes in the correct order. | ||||||
7982 | if (IsRawByte && Info.Ctx.getTypeSizeInChars(CharTy) != CharUnits::One()) | ||||||
7983 | return false; | ||||||
7984 | // Figure out what value we're actually looking for (after converting to | ||||||
7985 | // the corresponding unsigned type if necessary). | ||||||
7986 | uint64_t DesiredVal; | ||||||
7987 | bool StopAtNull = false; | ||||||
7988 | switch (BuiltinOp) { | ||||||
7989 | case Builtin::BIstrchr: | ||||||
7990 | case Builtin::BI__builtin_strchr: | ||||||
7991 | // strchr compares directly to the passed integer, and therefore | ||||||
7992 | // always fails if given an int that is not a char. | ||||||
7993 | if (!APSInt::isSameValue(HandleIntToIntCast(Info, E, CharTy, | ||||||
7994 | E->getArg(1)->getType(), | ||||||
7995 | Desired), | ||||||
7996 | Desired)) | ||||||
7997 | return ZeroInitialization(E); | ||||||
7998 | StopAtNull = true; | ||||||
7999 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||||
8000 | case Builtin::BImemchr: | ||||||
8001 | case Builtin::BI__builtin_memchr: | ||||||
8002 | case Builtin::BI__builtin_char_memchr: | ||||||
8003 | // memchr compares by converting both sides to unsigned char. That's also | ||||||
8004 | // correct for strchr if we get this far (to cope with plain char being | ||||||
8005 | // unsigned in the strchr case). | ||||||
8006 | DesiredVal = Desired.trunc(Info.Ctx.getCharWidth()).getZExtValue(); | ||||||
8007 | break; | ||||||
8008 | |||||||
8009 | case Builtin::BIwcschr: | ||||||
8010 | case Builtin::BI__builtin_wcschr: | ||||||
8011 | StopAtNull = true; | ||||||
8012 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||||
8013 | case Builtin::BIwmemchr: | ||||||
8014 | case Builtin::BI__builtin_wmemchr: | ||||||
8015 | // wcschr and wmemchr are given a wchar_t to look for. Just use it. | ||||||
8016 | DesiredVal = Desired.getZExtValue(); | ||||||
8017 | break; | ||||||
8018 | } | ||||||
8019 | |||||||
8020 | for (; MaxLength; --MaxLength) { | ||||||
8021 | APValue Char; | ||||||
8022 | if (!handleLValueToRValueConversion(Info, E, CharTy, Result, Char) || | ||||||
8023 | !Char.isInt()) | ||||||
8024 | return false; | ||||||
8025 | if (Char.getInt().getZExtValue() == DesiredVal) | ||||||
8026 | return true; | ||||||
8027 | if (StopAtNull && !Char.getInt()) | ||||||
8028 | break; | ||||||
8029 | if (!HandleLValueArrayAdjustment(Info, E, Result, CharTy, 1)) | ||||||
8030 | return false; | ||||||
8031 | } | ||||||
8032 | // Not found: return nullptr. | ||||||
8033 | return ZeroInitialization(E); | ||||||
8034 | } | ||||||
8035 | |||||||
8036 | case Builtin::BImemcpy: | ||||||
8037 | case Builtin::BImemmove: | ||||||
8038 | case Builtin::BIwmemcpy: | ||||||
8039 | case Builtin::BIwmemmove: | ||||||
8040 | if (Info.getLangOpts().CPlusPlus11) | ||||||
8041 | Info.CCEDiag(E, diag::note_constexpr_invalid_function) | ||||||
8042 | << /*isConstexpr*/0 << /*isConstructor*/0 | ||||||
8043 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'"); | ||||||
8044 | else | ||||||
8045 | Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
8046 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||||
8047 | case Builtin::BI__builtin_memcpy: | ||||||
8048 | case Builtin::BI__builtin_memmove: | ||||||
8049 | case Builtin::BI__builtin_wmemcpy: | ||||||
8050 | case Builtin::BI__builtin_wmemmove: { | ||||||
8051 | bool WChar = BuiltinOp == Builtin::BIwmemcpy || | ||||||
8052 | BuiltinOp == Builtin::BIwmemmove || | ||||||
8053 | BuiltinOp == Builtin::BI__builtin_wmemcpy || | ||||||
8054 | BuiltinOp == Builtin::BI__builtin_wmemmove; | ||||||
8055 | bool Move = BuiltinOp == Builtin::BImemmove || | ||||||
8056 | BuiltinOp == Builtin::BIwmemmove || | ||||||
8057 | BuiltinOp == Builtin::BI__builtin_memmove || | ||||||
8058 | BuiltinOp == Builtin::BI__builtin_wmemmove; | ||||||
8059 | |||||||
8060 | // The result of mem* is the first argument. | ||||||
8061 | if (!Visit(E->getArg(0))) | ||||||
8062 | return false; | ||||||
8063 | LValue Dest = Result; | ||||||
8064 | |||||||
8065 | LValue Src; | ||||||
8066 | if (!EvaluatePointer(E->getArg(1), Src, Info)) | ||||||
8067 | return false; | ||||||
8068 | |||||||
8069 | APSInt N; | ||||||
8070 | if (!EvaluateInteger(E->getArg(2), N, Info)) | ||||||
8071 | return false; | ||||||
8072 | assert(!N.isSigned() && "memcpy and friends take an unsigned size")((!N.isSigned() && "memcpy and friends take an unsigned size" ) ? static_cast<void> (0) : __assert_fail ("!N.isSigned() && \"memcpy and friends take an unsigned size\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8072, __PRETTY_FUNCTION__)); | ||||||
8073 | |||||||
8074 | // If the size is zero, we treat this as always being a valid no-op. | ||||||
8075 | // (Even if one of the src and dest pointers is null.) | ||||||
8076 | if (!N) | ||||||
8077 | return true; | ||||||
8078 | |||||||
8079 | // Otherwise, if either of the operands is null, we can't proceed. Don't | ||||||
8080 | // try to determine the type of the copied objects, because there aren't | ||||||
8081 | // any. | ||||||
8082 | if (!Src.Base || !Dest.Base) { | ||||||
8083 | APValue Val; | ||||||
8084 | (!Src.Base ? Src : Dest).moveInto(Val); | ||||||
8085 | Info.FFDiag(E, diag::note_constexpr_memcpy_null) | ||||||
8086 | << Move << WChar << !!Src.Base | ||||||
8087 | << Val.getAsString(Info.Ctx, E->getArg(0)->getType()); | ||||||
8088 | return false; | ||||||
8089 | } | ||||||
8090 | if (Src.Designator.Invalid || Dest.Designator.Invalid) | ||||||
8091 | return false; | ||||||
8092 | |||||||
8093 | // We require that Src and Dest are both pointers to arrays of | ||||||
8094 | // trivially-copyable type. (For the wide version, the designator will be | ||||||
8095 | // invalid if the designated object is not a wchar_t.) | ||||||
8096 | QualType T = Dest.Designator.getType(Info.Ctx); | ||||||
8097 | QualType SrcT = Src.Designator.getType(Info.Ctx); | ||||||
8098 | if (!Info.Ctx.hasSameUnqualifiedType(T, SrcT)) { | ||||||
8099 | Info.FFDiag(E, diag::note_constexpr_memcpy_type_pun) << Move << SrcT << T; | ||||||
8100 | return false; | ||||||
8101 | } | ||||||
8102 | if (T->isIncompleteType()) { | ||||||
8103 | Info.FFDiag(E, diag::note_constexpr_memcpy_incomplete_type) << Move << T; | ||||||
8104 | return false; | ||||||
8105 | } | ||||||
8106 | if (!T.isTriviallyCopyableType(Info.Ctx)) { | ||||||
8107 | Info.FFDiag(E, diag::note_constexpr_memcpy_nontrivial) << Move << T; | ||||||
8108 | return false; | ||||||
8109 | } | ||||||
8110 | |||||||
8111 | // Figure out how many T's we're copying. | ||||||
8112 | uint64_t TSize = Info.Ctx.getTypeSizeInChars(T).getQuantity(); | ||||||
8113 | if (!WChar) { | ||||||
8114 | uint64_t Remainder; | ||||||
8115 | llvm::APInt OrigN = N; | ||||||
8116 | llvm::APInt::udivrem(OrigN, TSize, N, Remainder); | ||||||
8117 | if (Remainder) { | ||||||
8118 | Info.FFDiag(E, diag::note_constexpr_memcpy_unsupported) | ||||||
8119 | << Move << WChar << 0 << T << OrigN.toString(10, /*Signed*/false) | ||||||
8120 | << (unsigned)TSize; | ||||||
8121 | return false; | ||||||
8122 | } | ||||||
8123 | } | ||||||
8124 | |||||||
8125 | // Check that the copying will remain within the arrays, just so that we | ||||||
8126 | // can give a more meaningful diagnostic. This implicitly also checks that | ||||||
8127 | // N fits into 64 bits. | ||||||
8128 | uint64_t RemainingSrcSize = Src.Designator.validIndexAdjustments().second; | ||||||
8129 | uint64_t RemainingDestSize = Dest.Designator.validIndexAdjustments().second; | ||||||
8130 | if (N.ugt(RemainingSrcSize) || N.ugt(RemainingDestSize)) { | ||||||
8131 | Info.FFDiag(E, diag::note_constexpr_memcpy_unsupported) | ||||||
8132 | << Move << WChar << (N.ugt(RemainingSrcSize) ? 1 : 2) << T | ||||||
8133 | << N.toString(10, /*Signed*/false); | ||||||
8134 | return false; | ||||||
8135 | } | ||||||
8136 | uint64_t NElems = N.getZExtValue(); | ||||||
8137 | uint64_t NBytes = NElems * TSize; | ||||||
8138 | |||||||
8139 | // Check for overlap. | ||||||
8140 | int Direction = 1; | ||||||
8141 | if (HasSameBase(Src, Dest)) { | ||||||
8142 | uint64_t SrcOffset = Src.getLValueOffset().getQuantity(); | ||||||
8143 | uint64_t DestOffset = Dest.getLValueOffset().getQuantity(); | ||||||
8144 | if (DestOffset >= SrcOffset && DestOffset - SrcOffset < NBytes) { | ||||||
8145 | // Dest is inside the source region. | ||||||
8146 | if (!Move) { | ||||||
8147 | Info.FFDiag(E, diag::note_constexpr_memcpy_overlap) << WChar; | ||||||
8148 | return false; | ||||||
8149 | } | ||||||
8150 | // For memmove and friends, copy backwards. | ||||||
8151 | if (!HandleLValueArrayAdjustment(Info, E, Src, T, NElems - 1) || | ||||||
8152 | !HandleLValueArrayAdjustment(Info, E, Dest, T, NElems - 1)) | ||||||
8153 | return false; | ||||||
8154 | Direction = -1; | ||||||
8155 | } else if (!Move && SrcOffset >= DestOffset && | ||||||
8156 | SrcOffset - DestOffset < NBytes) { | ||||||
8157 | // Src is inside the destination region for memcpy: invalid. | ||||||
8158 | Info.FFDiag(E, diag::note_constexpr_memcpy_overlap) << WChar; | ||||||
8159 | return false; | ||||||
8160 | } | ||||||
8161 | } | ||||||
8162 | |||||||
8163 | while (true) { | ||||||
8164 | APValue Val; | ||||||
8165 | // FIXME: Set WantObjectRepresentation to true if we're copying a | ||||||
8166 | // char-like type? | ||||||
8167 | if (!handleLValueToRValueConversion(Info, E, T, Src, Val) || | ||||||
8168 | !handleAssignment(Info, E, Dest, T, Val)) | ||||||
8169 | return false; | ||||||
8170 | // Do not iterate past the last element; if we're copying backwards, that | ||||||
8171 | // might take us off the start of the array. | ||||||
8172 | if (--NElems == 0) | ||||||
8173 | return true; | ||||||
8174 | if (!HandleLValueArrayAdjustment(Info, E, Src, T, Direction) || | ||||||
8175 | !HandleLValueArrayAdjustment(Info, E, Dest, T, Direction)) | ||||||
8176 | return false; | ||||||
8177 | } | ||||||
8178 | } | ||||||
8179 | |||||||
8180 | default: | ||||||
8181 | return visitNonBuiltinCallExpr(E); | ||||||
8182 | } | ||||||
8183 | } | ||||||
8184 | |||||||
8185 | static bool EvaluateArrayNewInitList(EvalInfo &Info, LValue &This, | ||||||
8186 | APValue &Result, const InitListExpr *ILE, | ||||||
8187 | QualType AllocType); | ||||||
8188 | |||||||
8189 | bool PointerExprEvaluator::VisitCXXNewExpr(const CXXNewExpr *E) { | ||||||
8190 | if (!Info.getLangOpts().CPlusPlus2a) | ||||||
8191 | Info.CCEDiag(E, diag::note_constexpr_new); | ||||||
8192 | |||||||
8193 | // We cannot speculatively evaluate a delete expression. | ||||||
8194 | if (Info.SpeculativeEvaluationDepth) | ||||||
8195 | return false; | ||||||
8196 | |||||||
8197 | FunctionDecl *OperatorNew = E->getOperatorNew(); | ||||||
8198 | if (!OperatorNew->isReplaceableGlobalAllocationFunction()) { | ||||||
8199 | Info.FFDiag(E, diag::note_constexpr_new_non_replaceable) | ||||||
8200 | << isa<CXXMethodDecl>(OperatorNew) << OperatorNew; | ||||||
8201 | return false; | ||||||
8202 | } | ||||||
8203 | |||||||
8204 | bool IsNothrow = false; | ||||||
8205 | if (E->getNumPlacementArgs()) { | ||||||
8206 | // The only new-placement list we support is of the form (std::nothrow). | ||||||
8207 | // | ||||||
8208 | // FIXME: There is no restriction on this, but it's not clear that any | ||||||
8209 | // other form makes any sense. We get here for cases such as: | ||||||
8210 | // | ||||||
8211 | // new (std::align_val_t{N}) X(int) | ||||||
8212 | // | ||||||
8213 | // (which should presumably be valid only if N is a multiple of | ||||||
8214 | // alignof(int), and in any case can't be deallocated unless N is | ||||||
8215 | // alignof(X) and X has new-extended alignment). | ||||||
8216 | if (E->getNumPlacementArgs() != 1 || | ||||||
8217 | !E->getPlacementArg(0)->getType()->isNothrowT()) | ||||||
8218 | return Error(E, diag::note_constexpr_new_placement); | ||||||
8219 | |||||||
8220 | LValue Nothrow; | ||||||
8221 | if (!EvaluateLValue(E->getPlacementArg(0), Nothrow, Info)) | ||||||
8222 | return false; | ||||||
8223 | IsNothrow = true; | ||||||
8224 | } | ||||||
8225 | |||||||
8226 | const Expr *Init = E->getInitializer(); | ||||||
8227 | const InitListExpr *ResizedArrayILE = nullptr; | ||||||
8228 | |||||||
8229 | QualType AllocType = E->getAllocatedType(); | ||||||
8230 | if (Optional<const Expr*> ArraySize = E->getArraySize()) { | ||||||
8231 | const Expr *Stripped = *ArraySize; | ||||||
8232 | for (; auto *ICE = dyn_cast<ImplicitCastExpr>(Stripped); | ||||||
8233 | Stripped = ICE->getSubExpr()) | ||||||
8234 | if (ICE->getCastKind() != CK_NoOp && | ||||||
8235 | ICE->getCastKind() != CK_IntegralCast) | ||||||
8236 | break; | ||||||
8237 | |||||||
8238 | llvm::APSInt ArrayBound; | ||||||
8239 | if (!EvaluateInteger(Stripped, ArrayBound, Info)) | ||||||
8240 | return false; | ||||||
8241 | |||||||
8242 | // C++ [expr.new]p9: | ||||||
8243 | // The expression is erroneous if: | ||||||
8244 | // -- [...] its value before converting to size_t [or] applying the | ||||||
8245 | // second standard conversion sequence is less than zero | ||||||
8246 | if (ArrayBound.isSigned() && ArrayBound.isNegative()) { | ||||||
8247 | if (IsNothrow) | ||||||
8248 | return ZeroInitialization(E); | ||||||
8249 | |||||||
8250 | Info.FFDiag(*ArraySize, diag::note_constexpr_new_negative) | ||||||
8251 | << ArrayBound << (*ArraySize)->getSourceRange(); | ||||||
8252 | return false; | ||||||
8253 | } | ||||||
8254 | |||||||
8255 | // -- its value is such that the size of the allocated object would | ||||||
8256 | // exceed the implementation-defined limit | ||||||
8257 | if (ConstantArrayType::getNumAddressingBits(Info.Ctx, AllocType, | ||||||
8258 | ArrayBound) > | ||||||
8259 | ConstantArrayType::getMaxSizeBits(Info.Ctx)) { | ||||||
8260 | if (IsNothrow) | ||||||
8261 | return ZeroInitialization(E); | ||||||
8262 | |||||||
8263 | Info.FFDiag(*ArraySize, diag::note_constexpr_new_too_large) | ||||||
8264 | << ArrayBound << (*ArraySize)->getSourceRange(); | ||||||
8265 | return false; | ||||||
8266 | } | ||||||
8267 | |||||||
8268 | // -- the new-initializer is a braced-init-list and the number of | ||||||
8269 | // array elements for which initializers are provided [...] | ||||||
8270 | // exceeds the number of elements to initialize | ||||||
8271 | if (Init) { | ||||||
8272 | auto *CAT = Info.Ctx.getAsConstantArrayType(Init->getType()); | ||||||
8273 | assert(CAT && "unexpected type for array initializer")((CAT && "unexpected type for array initializer") ? static_cast <void> (0) : __assert_fail ("CAT && \"unexpected type for array initializer\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8273, __PRETTY_FUNCTION__)); | ||||||
8274 | |||||||
8275 | unsigned Bits = | ||||||
8276 | std::max(CAT->getSize().getBitWidth(), ArrayBound.getBitWidth()); | ||||||
8277 | llvm::APInt InitBound = CAT->getSize().zextOrSelf(Bits); | ||||||
8278 | llvm::APInt AllocBound = ArrayBound.zextOrSelf(Bits); | ||||||
8279 | if (InitBound.ugt(AllocBound)) { | ||||||
8280 | if (IsNothrow) | ||||||
8281 | return ZeroInitialization(E); | ||||||
8282 | |||||||
8283 | Info.FFDiag(*ArraySize, diag::note_constexpr_new_too_small) | ||||||
8284 | << AllocBound.toString(10, /*Signed=*/false) | ||||||
8285 | << InitBound.toString(10, /*Signed=*/false) | ||||||
8286 | << (*ArraySize)->getSourceRange(); | ||||||
8287 | return false; | ||||||
8288 | } | ||||||
8289 | |||||||
8290 | // If the sizes differ, we must have an initializer list, and we need | ||||||
8291 | // special handling for this case when we initialize. | ||||||
8292 | if (InitBound != AllocBound) | ||||||
8293 | ResizedArrayILE = cast<InitListExpr>(Init); | ||||||
8294 | } | ||||||
8295 | |||||||
8296 | AllocType = Info.Ctx.getConstantArrayType(AllocType, ArrayBound, | ||||||
8297 | ArrayType::Normal, 0); | ||||||
8298 | } else { | ||||||
8299 | assert(!AllocType->isArrayType() &&((!AllocType->isArrayType() && "array allocation with non-array new" ) ? static_cast<void> (0) : __assert_fail ("!AllocType->isArrayType() && \"array allocation with non-array new\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8300, __PRETTY_FUNCTION__)) | ||||||
8300 | "array allocation with non-array new")((!AllocType->isArrayType() && "array allocation with non-array new" ) ? static_cast<void> (0) : __assert_fail ("!AllocType->isArrayType() && \"array allocation with non-array new\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8300, __PRETTY_FUNCTION__)); | ||||||
8301 | } | ||||||
8302 | |||||||
8303 | // Perform the allocation and obtain a pointer to the resulting object. | ||||||
8304 | APValue *Val = Info.createHeapAlloc(E, AllocType, Result); | ||||||
8305 | if (!Val) | ||||||
8306 | return false; | ||||||
8307 | |||||||
8308 | if (ResizedArrayILE) { | ||||||
8309 | if (!EvaluateArrayNewInitList(Info, Result, *Val, ResizedArrayILE, | ||||||
8310 | AllocType)) | ||||||
8311 | return false; | ||||||
8312 | } else if (Init) { | ||||||
8313 | if (!EvaluateInPlace(*Val, Info, Result, Init)) | ||||||
8314 | return false; | ||||||
8315 | } else { | ||||||
8316 | *Val = getDefaultInitValue(AllocType); | ||||||
8317 | } | ||||||
8318 | |||||||
8319 | // Array new returns a pointer to the first element, not a pointer to the | ||||||
8320 | // array. | ||||||
8321 | if (auto *AT = AllocType->getAsArrayTypeUnsafe()) | ||||||
8322 | Result.addArray(Info, E, cast<ConstantArrayType>(AT)); | ||||||
8323 | |||||||
8324 | return true; | ||||||
8325 | } | ||||||
8326 | //===----------------------------------------------------------------------===// | ||||||
8327 | // Member Pointer Evaluation | ||||||
8328 | //===----------------------------------------------------------------------===// | ||||||
8329 | |||||||
8330 | namespace { | ||||||
8331 | class MemberPointerExprEvaluator | ||||||
8332 | : public ExprEvaluatorBase<MemberPointerExprEvaluator> { | ||||||
8333 | MemberPtr &Result; | ||||||
8334 | |||||||
8335 | bool Success(const ValueDecl *D) { | ||||||
8336 | Result = MemberPtr(D); | ||||||
8337 | return true; | ||||||
8338 | } | ||||||
8339 | public: | ||||||
8340 | |||||||
8341 | MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) | ||||||
8342 | : ExprEvaluatorBaseTy(Info), Result(Result) {} | ||||||
8343 | |||||||
8344 | bool Success(const APValue &V, const Expr *E) { | ||||||
8345 | Result.setFrom(V); | ||||||
8346 | return true; | ||||||
8347 | } | ||||||
8348 | bool ZeroInitialization(const Expr *E) { | ||||||
8349 | return Success((const ValueDecl*)nullptr); | ||||||
8350 | } | ||||||
8351 | |||||||
8352 | bool VisitCastExpr(const CastExpr *E); | ||||||
8353 | bool VisitUnaryAddrOf(const UnaryOperator *E); | ||||||
8354 | }; | ||||||
8355 | } // end anonymous namespace | ||||||
8356 | |||||||
8357 | static bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, | ||||||
8358 | EvalInfo &Info) { | ||||||
8359 | assert(E->isRValue() && E->getType()->isMemberPointerType())((E->isRValue() && E->getType()->isMemberPointerType ()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isMemberPointerType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8359, __PRETTY_FUNCTION__)); | ||||||
8360 | return MemberPointerExprEvaluator(Info, Result).Visit(E); | ||||||
8361 | } | ||||||
8362 | |||||||
8363 | bool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { | ||||||
8364 | switch (E->getCastKind()) { | ||||||
8365 | default: | ||||||
8366 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
8367 | |||||||
8368 | case CK_NullToMemberPointer: | ||||||
8369 | VisitIgnoredValue(E->getSubExpr()); | ||||||
8370 | return ZeroInitialization(E); | ||||||
8371 | |||||||
8372 | case CK_BaseToDerivedMemberPointer: { | ||||||
8373 | if (!Visit(E->getSubExpr())) | ||||||
8374 | return false; | ||||||
8375 | if (E->path_empty()) | ||||||
8376 | return true; | ||||||
8377 | // Base-to-derived member pointer casts store the path in derived-to-base | ||||||
8378 | // order, so iterate backwards. The CXXBaseSpecifier also provides us with | ||||||
8379 | // the wrong end of the derived->base arc, so stagger the path by one class. | ||||||
8380 | typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; | ||||||
8381 | for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); | ||||||
8382 | PathI != PathE; ++PathI) { | ||||||
8383 | assert(!(*PathI)->isVirtual() && "memptr cast through vbase")((!(*PathI)->isVirtual() && "memptr cast through vbase" ) ? static_cast<void> (0) : __assert_fail ("!(*PathI)->isVirtual() && \"memptr cast through vbase\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8383, __PRETTY_FUNCTION__)); | ||||||
8384 | const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); | ||||||
8385 | if (!Result.castToDerived(Derived)) | ||||||
8386 | return Error(E); | ||||||
8387 | } | ||||||
8388 | const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); | ||||||
8389 | if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) | ||||||
8390 | return Error(E); | ||||||
8391 | return true; | ||||||
8392 | } | ||||||
8393 | |||||||
8394 | case CK_DerivedToBaseMemberPointer: | ||||||
8395 | if (!Visit(E->getSubExpr())) | ||||||
8396 | return false; | ||||||
8397 | for (CastExpr::path_const_iterator PathI = E->path_begin(), | ||||||
8398 | PathE = E->path_end(); PathI != PathE; ++PathI) { | ||||||
8399 | assert(!(*PathI)->isVirtual() && "memptr cast through vbase")((!(*PathI)->isVirtual() && "memptr cast through vbase" ) ? static_cast<void> (0) : __assert_fail ("!(*PathI)->isVirtual() && \"memptr cast through vbase\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8399, __PRETTY_FUNCTION__)); | ||||||
8400 | const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); | ||||||
8401 | if (!Result.castToBase(Base)) | ||||||
8402 | return Error(E); | ||||||
8403 | } | ||||||
8404 | return true; | ||||||
8405 | } | ||||||
8406 | } | ||||||
8407 | |||||||
8408 | bool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { | ||||||
8409 | // C++11 [expr.unary.op]p3 has very strict rules on how the address of a | ||||||
8410 | // member can be formed. | ||||||
8411 | return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); | ||||||
8412 | } | ||||||
8413 | |||||||
8414 | //===----------------------------------------------------------------------===// | ||||||
8415 | // Record Evaluation | ||||||
8416 | //===----------------------------------------------------------------------===// | ||||||
8417 | |||||||
8418 | namespace { | ||||||
8419 | class RecordExprEvaluator | ||||||
8420 | : public ExprEvaluatorBase<RecordExprEvaluator> { | ||||||
8421 | const LValue &This; | ||||||
8422 | APValue &Result; | ||||||
8423 | public: | ||||||
8424 | |||||||
8425 | RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) | ||||||
8426 | : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} | ||||||
8427 | |||||||
8428 | bool Success(const APValue &V, const Expr *E) { | ||||||
8429 | Result = V; | ||||||
8430 | return true; | ||||||
8431 | } | ||||||
8432 | bool ZeroInitialization(const Expr *E) { | ||||||
8433 | return ZeroInitialization(E, E->getType()); | ||||||
8434 | } | ||||||
8435 | bool ZeroInitialization(const Expr *E, QualType T); | ||||||
8436 | |||||||
8437 | bool VisitCallExpr(const CallExpr *E) { | ||||||
8438 | return handleCallExpr(E, Result, &This); | ||||||
8439 | } | ||||||
8440 | bool VisitCastExpr(const CastExpr *E); | ||||||
8441 | bool VisitInitListExpr(const InitListExpr *E); | ||||||
8442 | bool VisitCXXConstructExpr(const CXXConstructExpr *E) { | ||||||
8443 | return VisitCXXConstructExpr(E, E->getType()); | ||||||
8444 | } | ||||||
8445 | bool VisitLambdaExpr(const LambdaExpr *E); | ||||||
8446 | bool VisitCXXInheritedCtorInitExpr(const CXXInheritedCtorInitExpr *E); | ||||||
8447 | bool VisitCXXConstructExpr(const CXXConstructExpr *E, QualType T); | ||||||
8448 | bool VisitCXXStdInitializerListExpr(const CXXStdInitializerListExpr *E); | ||||||
8449 | |||||||
8450 | // Temporaries are registered when created, so we don't care about | ||||||
8451 | // CXXBindTemporaryExpr. | ||||||
8452 | bool VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) { | ||||||
8453 | return Visit(E->getSubExpr()); | ||||||
8454 | } | ||||||
8455 | |||||||
8456 | bool VisitBinCmp(const BinaryOperator *E); | ||||||
8457 | }; | ||||||
8458 | } | ||||||
8459 | |||||||
8460 | /// Perform zero-initialization on an object of non-union class type. | ||||||
8461 | /// C++11 [dcl.init]p5: | ||||||
8462 | /// To zero-initialize an object or reference of type T means: | ||||||
8463 | /// [...] | ||||||
8464 | /// -- if T is a (possibly cv-qualified) non-union class type, | ||||||
8465 | /// each non-static data member and each base-class subobject is | ||||||
8466 | /// zero-initialized | ||||||
8467 | static bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, | ||||||
8468 | const RecordDecl *RD, | ||||||
8469 | const LValue &This, APValue &Result) { | ||||||
8470 | assert(!RD->isUnion() && "Expected non-union class type")((!RD->isUnion() && "Expected non-union class type" ) ? static_cast<void> (0) : __assert_fail ("!RD->isUnion() && \"Expected non-union class type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8470, __PRETTY_FUNCTION__)); | ||||||
8471 | const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); | ||||||
8472 | Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, | ||||||
8473 | std::distance(RD->field_begin(), RD->field_end())); | ||||||
8474 | |||||||
8475 | if (RD->isInvalidDecl()) return false; | ||||||
8476 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | ||||||
8477 | |||||||
8478 | if (CD) { | ||||||
8479 | unsigned Index = 0; | ||||||
8480 | for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), | ||||||
8481 | End = CD->bases_end(); I != End; ++I, ++Index) { | ||||||
8482 | const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); | ||||||
8483 | LValue Subobject = This; | ||||||
8484 | if (!HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout)) | ||||||
8485 | return false; | ||||||
8486 | if (!HandleClassZeroInitialization(Info, E, Base, Subobject, | ||||||
8487 | Result.getStructBase(Index))) | ||||||
8488 | return false; | ||||||
8489 | } | ||||||
8490 | } | ||||||
8491 | |||||||
8492 | for (const auto *I : RD->fields()) { | ||||||
8493 | // -- if T is a reference type, no initialization is performed. | ||||||
8494 | if (I->getType()->isReferenceType()) | ||||||
8495 | continue; | ||||||
8496 | |||||||
8497 | LValue Subobject = This; | ||||||
8498 | if (!HandleLValueMember(Info, E, Subobject, I, &Layout)) | ||||||
8499 | return false; | ||||||
8500 | |||||||
8501 | ImplicitValueInitExpr VIE(I->getType()); | ||||||
8502 | if (!EvaluateInPlace( | ||||||
8503 | Result.getStructField(I->getFieldIndex()), Info, Subobject, &VIE)) | ||||||
8504 | return false; | ||||||
8505 | } | ||||||
8506 | |||||||
8507 | return true; | ||||||
8508 | } | ||||||
8509 | |||||||
8510 | bool RecordExprEvaluator::ZeroInitialization(const Expr *E, QualType T) { | ||||||
8511 | const RecordDecl *RD = T->castAs<RecordType>()->getDecl(); | ||||||
8512 | if (RD->isInvalidDecl()) return false; | ||||||
8513 | if (RD->isUnion()) { | ||||||
8514 | // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the | ||||||
8515 | // object's first non-static named data member is zero-initialized | ||||||
8516 | RecordDecl::field_iterator I = RD->field_begin(); | ||||||
8517 | if (I == RD->field_end()) { | ||||||
8518 | Result = APValue((const FieldDecl*)nullptr); | ||||||
8519 | return true; | ||||||
8520 | } | ||||||
8521 | |||||||
8522 | LValue Subobject = This; | ||||||
8523 | if (!HandleLValueMember(Info, E, Subobject, *I)) | ||||||
8524 | return false; | ||||||
8525 | Result = APValue(*I); | ||||||
8526 | ImplicitValueInitExpr VIE(I->getType()); | ||||||
8527 | return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); | ||||||
8528 | } | ||||||
8529 | |||||||
8530 | if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) { | ||||||
8531 | Info.FFDiag(E, diag::note_constexpr_virtual_base) << RD; | ||||||
8532 | return false; | ||||||
8533 | } | ||||||
8534 | |||||||
8535 | return HandleClassZeroInitialization(Info, E, RD, This, Result); | ||||||
8536 | } | ||||||
8537 | |||||||
8538 | bool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { | ||||||
8539 | switch (E->getCastKind()) { | ||||||
8540 | default: | ||||||
8541 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
8542 | |||||||
8543 | case CK_ConstructorConversion: | ||||||
8544 | return Visit(E->getSubExpr()); | ||||||
8545 | |||||||
8546 | case CK_DerivedToBase: | ||||||
8547 | case CK_UncheckedDerivedToBase: { | ||||||
8548 | APValue DerivedObject; | ||||||
8549 | if (!Evaluate(DerivedObject, Info, E->getSubExpr())) | ||||||
8550 | return false; | ||||||
8551 | if (!DerivedObject.isStruct()) | ||||||
8552 | return Error(E->getSubExpr()); | ||||||
8553 | |||||||
8554 | // Derived-to-base rvalue conversion: just slice off the derived part. | ||||||
8555 | APValue *Value = &DerivedObject; | ||||||
8556 | const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); | ||||||
8557 | for (CastExpr::path_const_iterator PathI = E->path_begin(), | ||||||
8558 | PathE = E->path_end(); PathI != PathE; ++PathI) { | ||||||
8559 | assert(!(*PathI)->isVirtual() && "record rvalue with virtual base")((!(*PathI)->isVirtual() && "record rvalue with virtual base" ) ? static_cast<void> (0) : __assert_fail ("!(*PathI)->isVirtual() && \"record rvalue with virtual base\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8559, __PRETTY_FUNCTION__)); | ||||||
8560 | const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); | ||||||
8561 | Value = &Value->getStructBase(getBaseIndex(RD, Base)); | ||||||
8562 | RD = Base; | ||||||
8563 | } | ||||||
8564 | Result = *Value; | ||||||
8565 | return true; | ||||||
8566 | } | ||||||
8567 | } | ||||||
8568 | } | ||||||
8569 | |||||||
8570 | bool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { | ||||||
8571 | if (E->isTransparent()) | ||||||
8572 | return Visit(E->getInit(0)); | ||||||
8573 | |||||||
8574 | const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); | ||||||
8575 | if (RD->isInvalidDecl()) return false; | ||||||
8576 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | ||||||
8577 | auto *CXXRD = dyn_cast<CXXRecordDecl>(RD); | ||||||
8578 | |||||||
8579 | EvalInfo::EvaluatingConstructorRAII EvalObj( | ||||||
8580 | Info, | ||||||
8581 | ObjectUnderConstruction{This.getLValueBase(), This.Designator.Entries}, | ||||||
8582 | CXXRD && CXXRD->getNumBases()); | ||||||
8583 | |||||||
8584 | if (RD->isUnion()) { | ||||||
8585 | const FieldDecl *Field = E->getInitializedFieldInUnion(); | ||||||
8586 | Result = APValue(Field); | ||||||
8587 | if (!Field) | ||||||
8588 | return true; | ||||||
8589 | |||||||
8590 | // If the initializer list for a union does not contain any elements, the | ||||||
8591 | // first element of the union is value-initialized. | ||||||
8592 | // FIXME: The element should be initialized from an initializer list. | ||||||
8593 | // Is this difference ever observable for initializer lists which | ||||||
8594 | // we don't build? | ||||||
8595 | ImplicitValueInitExpr VIE(Field->getType()); | ||||||
8596 | const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; | ||||||
8597 | |||||||
8598 | LValue Subobject = This; | ||||||
8599 | if (!HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout)) | ||||||
8600 | return false; | ||||||
8601 | |||||||
8602 | // Temporarily override This, in case there's a CXXDefaultInitExpr in here. | ||||||
8603 | ThisOverrideRAII ThisOverride(*Info.CurrentCall, &This, | ||||||
8604 | isa<CXXDefaultInitExpr>(InitExpr)); | ||||||
8605 | |||||||
8606 | return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr); | ||||||
8607 | } | ||||||
8608 | |||||||
8609 | if (!Result.hasValue()) | ||||||
8610 | Result = APValue(APValue::UninitStruct(), CXXRD ? CXXRD->getNumBases() : 0, | ||||||
8611 | std::distance(RD->field_begin(), RD->field_end())); | ||||||
8612 | unsigned ElementNo = 0; | ||||||
8613 | bool Success = true; | ||||||
8614 | |||||||
8615 | // Initialize base classes. | ||||||
8616 | if (CXXRD && CXXRD->getNumBases()) { | ||||||
8617 | for (const auto &Base : CXXRD->bases()) { | ||||||
8618 | assert(ElementNo < E->getNumInits() && "missing init for base class")((ElementNo < E->getNumInits() && "missing init for base class" ) ? static_cast<void> (0) : __assert_fail ("ElementNo < E->getNumInits() && \"missing init for base class\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8618, __PRETTY_FUNCTION__)); | ||||||
8619 | const Expr *Init = E->getInit(ElementNo); | ||||||
8620 | |||||||
8621 | LValue Subobject = This; | ||||||
8622 | if (!HandleLValueBase(Info, Init, Subobject, CXXRD, &Base)) | ||||||
8623 | return false; | ||||||
8624 | |||||||
8625 | APValue &FieldVal = Result.getStructBase(ElementNo); | ||||||
8626 | if (!EvaluateInPlace(FieldVal, Info, Subobject, Init)) { | ||||||
8627 | if (!Info.noteFailure()) | ||||||
8628 | return false; | ||||||
8629 | Success = false; | ||||||
8630 | } | ||||||
8631 | ++ElementNo; | ||||||
8632 | } | ||||||
8633 | |||||||
8634 | EvalObj.finishedConstructingBases(); | ||||||
8635 | } | ||||||
8636 | |||||||
8637 | // Initialize members. | ||||||
8638 | for (const auto *Field : RD->fields()) { | ||||||
8639 | // Anonymous bit-fields are not considered members of the class for | ||||||
8640 | // purposes of aggregate initialization. | ||||||
8641 | if (Field->isUnnamedBitfield()) | ||||||
8642 | continue; | ||||||
8643 | |||||||
8644 | LValue Subobject = This; | ||||||
8645 | |||||||
8646 | bool HaveInit = ElementNo < E->getNumInits(); | ||||||
8647 | |||||||
8648 | // FIXME: Diagnostics here should point to the end of the initializer | ||||||
8649 | // list, not the start. | ||||||
8650 | if (!HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, | ||||||
8651 | Subobject, Field, &Layout)) | ||||||
8652 | return false; | ||||||
8653 | |||||||
8654 | // Perform an implicit value-initialization for members beyond the end of | ||||||
8655 | // the initializer list. | ||||||
8656 | ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); | ||||||
8657 | const Expr *Init = HaveInit ? E->getInit(ElementNo++) : &VIE; | ||||||
8658 | |||||||
8659 | // Temporarily override This, in case there's a CXXDefaultInitExpr in here. | ||||||
8660 | ThisOverrideRAII ThisOverride(*Info.CurrentCall, &This, | ||||||
8661 | isa<CXXDefaultInitExpr>(Init)); | ||||||
8662 | |||||||
8663 | APValue &FieldVal = Result.getStructField(Field->getFieldIndex()); | ||||||
8664 | if (!EvaluateInPlace(FieldVal, Info, Subobject, Init) || | ||||||
8665 | (Field->isBitField() && !truncateBitfieldValue(Info, Init, | ||||||
8666 | FieldVal, Field))) { | ||||||
8667 | if (!Info.noteFailure()) | ||||||
8668 | return false; | ||||||
8669 | Success = false; | ||||||
8670 | } | ||||||
8671 | } | ||||||
8672 | |||||||
8673 | return Success; | ||||||
8674 | } | ||||||
8675 | |||||||
8676 | bool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E, | ||||||
8677 | QualType T) { | ||||||
8678 | // Note that E's type is not necessarily the type of our class here; we might | ||||||
8679 | // be initializing an array element instead. | ||||||
8680 | const CXXConstructorDecl *FD = E->getConstructor(); | ||||||
8681 | if (FD->isInvalidDecl() || FD->getParent()->isInvalidDecl()) return false; | ||||||
8682 | |||||||
8683 | bool ZeroInit = E->requiresZeroInitialization(); | ||||||
8684 | if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { | ||||||
8685 | // If we've already performed zero-initialization, we're already done. | ||||||
8686 | if (Result.hasValue()) | ||||||
8687 | return true; | ||||||
8688 | |||||||
8689 | if (ZeroInit) | ||||||
8690 | return ZeroInitialization(E, T); | ||||||
8691 | |||||||
8692 | Result = getDefaultInitValue(T); | ||||||
8693 | return true; | ||||||
8694 | } | ||||||
8695 | |||||||
8696 | const FunctionDecl *Definition = nullptr; | ||||||
8697 | auto Body = FD->getBody(Definition); | ||||||
8698 | |||||||
8699 | if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition, Body)) | ||||||
8700 | return false; | ||||||
8701 | |||||||
8702 | // Avoid materializing a temporary for an elidable copy/move constructor. | ||||||
8703 | if (E->isElidable() && !ZeroInit) | ||||||
8704 | if (const MaterializeTemporaryExpr *ME | ||||||
8705 | = dyn_cast<MaterializeTemporaryExpr>(E->getArg(0))) | ||||||
8706 | return Visit(ME->GetTemporaryExpr()); | ||||||
8707 | |||||||
8708 | if (ZeroInit && !ZeroInitialization(E, T)) | ||||||
8709 | return false; | ||||||
8710 | |||||||
8711 | auto Args = llvm::makeArrayRef(E->getArgs(), E->getNumArgs()); | ||||||
8712 | return HandleConstructorCall(E, This, Args, | ||||||
8713 | cast<CXXConstructorDecl>(Definition), Info, | ||||||
8714 | Result); | ||||||
8715 | } | ||||||
8716 | |||||||
8717 | bool RecordExprEvaluator::VisitCXXInheritedCtorInitExpr( | ||||||
8718 | const CXXInheritedCtorInitExpr *E) { | ||||||
8719 | if (!Info.CurrentCall) { | ||||||
8720 | assert(Info.checkingPotentialConstantExpression())((Info.checkingPotentialConstantExpression()) ? static_cast< void> (0) : __assert_fail ("Info.checkingPotentialConstantExpression()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8720, __PRETTY_FUNCTION__)); | ||||||
8721 | return false; | ||||||
8722 | } | ||||||
8723 | |||||||
8724 | const CXXConstructorDecl *FD = E->getConstructor(); | ||||||
8725 | if (FD->isInvalidDecl() || FD->getParent()->isInvalidDecl()) | ||||||
8726 | return false; | ||||||
8727 | |||||||
8728 | const FunctionDecl *Definition = nullptr; | ||||||
8729 | auto Body = FD->getBody(Definition); | ||||||
8730 | |||||||
8731 | if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition, Body)) | ||||||
8732 | return false; | ||||||
8733 | |||||||
8734 | return HandleConstructorCall(E, This, Info.CurrentCall->Arguments, | ||||||
8735 | cast<CXXConstructorDecl>(Definition), Info, | ||||||
8736 | Result); | ||||||
8737 | } | ||||||
8738 | |||||||
8739 | bool RecordExprEvaluator::VisitCXXStdInitializerListExpr( | ||||||
8740 | const CXXStdInitializerListExpr *E) { | ||||||
8741 | const ConstantArrayType *ArrayType = | ||||||
8742 | Info.Ctx.getAsConstantArrayType(E->getSubExpr()->getType()); | ||||||
8743 | |||||||
8744 | LValue Array; | ||||||
8745 | if (!EvaluateLValue(E->getSubExpr(), Array, Info)) | ||||||
8746 | return false; | ||||||
8747 | |||||||
8748 | // Get a pointer to the first element of the array. | ||||||
8749 | Array.addArray(Info, E, ArrayType); | ||||||
8750 | |||||||
8751 | // FIXME: Perform the checks on the field types in SemaInit. | ||||||
8752 | RecordDecl *Record = E->getType()->castAs<RecordType>()->getDecl(); | ||||||
8753 | RecordDecl::field_iterator Field = Record->field_begin(); | ||||||
8754 | if (Field == Record->field_end()) | ||||||
8755 | return Error(E); | ||||||
8756 | |||||||
8757 | // Start pointer. | ||||||
8758 | if (!Field->getType()->isPointerType() || | ||||||
8759 | !Info.Ctx.hasSameType(Field->getType()->getPointeeType(), | ||||||
8760 | ArrayType->getElementType())) | ||||||
8761 | return Error(E); | ||||||
8762 | |||||||
8763 | // FIXME: What if the initializer_list type has base classes, etc? | ||||||
8764 | Result = APValue(APValue::UninitStruct(), 0, 2); | ||||||
8765 | Array.moveInto(Result.getStructField(0)); | ||||||
8766 | |||||||
8767 | if (++Field == Record->field_end()) | ||||||
8768 | return Error(E); | ||||||
8769 | |||||||
8770 | if (Field->getType()->isPointerType() && | ||||||
8771 | Info.Ctx.hasSameType(Field->getType()->getPointeeType(), | ||||||
8772 | ArrayType->getElementType())) { | ||||||
8773 | // End pointer. | ||||||
8774 | if (!HandleLValueArrayAdjustment(Info, E, Array, | ||||||
8775 | ArrayType->getElementType(), | ||||||
8776 | ArrayType->getSize().getZExtValue())) | ||||||
8777 | return false; | ||||||
8778 | Array.moveInto(Result.getStructField(1)); | ||||||
8779 | } else if (Info.Ctx.hasSameType(Field->getType(), Info.Ctx.getSizeType())) | ||||||
8780 | // Length. | ||||||
8781 | Result.getStructField(1) = APValue(APSInt(ArrayType->getSize())); | ||||||
8782 | else | ||||||
8783 | return Error(E); | ||||||
8784 | |||||||
8785 | if (++Field != Record->field_end()) | ||||||
8786 | return Error(E); | ||||||
8787 | |||||||
8788 | return true; | ||||||
8789 | } | ||||||
8790 | |||||||
8791 | bool RecordExprEvaluator::VisitLambdaExpr(const LambdaExpr *E) { | ||||||
8792 | const CXXRecordDecl *ClosureClass = E->getLambdaClass(); | ||||||
8793 | if (ClosureClass->isInvalidDecl()) | ||||||
8794 | return false; | ||||||
8795 | |||||||
8796 | const size_t NumFields = | ||||||
8797 | std::distance(ClosureClass->field_begin(), ClosureClass->field_end()); | ||||||
8798 | |||||||
8799 | assert(NumFields == (size_t)std::distance(E->capture_init_begin(),((NumFields == (size_t)std::distance(E->capture_init_begin (), E->capture_init_end()) && "The number of lambda capture initializers should equal the number of " "fields within the closure type") ? static_cast<void> ( 0) : __assert_fail ("NumFields == (size_t)std::distance(E->capture_init_begin(), E->capture_init_end()) && \"The number of lambda capture initializers should equal the number of \" \"fields within the closure type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8802, __PRETTY_FUNCTION__)) | ||||||
8800 | E->capture_init_end()) &&((NumFields == (size_t)std::distance(E->capture_init_begin (), E->capture_init_end()) && "The number of lambda capture initializers should equal the number of " "fields within the closure type") ? static_cast<void> ( 0) : __assert_fail ("NumFields == (size_t)std::distance(E->capture_init_begin(), E->capture_init_end()) && \"The number of lambda capture initializers should equal the number of \" \"fields within the closure type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8802, __PRETTY_FUNCTION__)) | ||||||
8801 | "The number of lambda capture initializers should equal the number of "((NumFields == (size_t)std::distance(E->capture_init_begin (), E->capture_init_end()) && "The number of lambda capture initializers should equal the number of " "fields within the closure type") ? static_cast<void> ( 0) : __assert_fail ("NumFields == (size_t)std::distance(E->capture_init_begin(), E->capture_init_end()) && \"The number of lambda capture initializers should equal the number of \" \"fields within the closure type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8802, __PRETTY_FUNCTION__)) | ||||||
8802 | "fields within the closure type")((NumFields == (size_t)std::distance(E->capture_init_begin (), E->capture_init_end()) && "The number of lambda capture initializers should equal the number of " "fields within the closure type") ? static_cast<void> ( 0) : __assert_fail ("NumFields == (size_t)std::distance(E->capture_init_begin(), E->capture_init_end()) && \"The number of lambda capture initializers should equal the number of \" \"fields within the closure type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8802, __PRETTY_FUNCTION__)); | ||||||
8803 | |||||||
8804 | Result = APValue(APValue::UninitStruct(), /*NumBases*/0, NumFields); | ||||||
8805 | // Iterate through all the lambda's closure object's fields and initialize | ||||||
8806 | // them. | ||||||
8807 | auto *CaptureInitIt = E->capture_init_begin(); | ||||||
8808 | const LambdaCapture *CaptureIt = ClosureClass->captures_begin(); | ||||||
8809 | bool Success = true; | ||||||
8810 | for (const auto *Field : ClosureClass->fields()) { | ||||||
8811 | assert(CaptureInitIt != E->capture_init_end())((CaptureInitIt != E->capture_init_end()) ? static_cast< void> (0) : __assert_fail ("CaptureInitIt != E->capture_init_end()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8811, __PRETTY_FUNCTION__)); | ||||||
8812 | // Get the initializer for this field | ||||||
8813 | Expr *const CurFieldInit = *CaptureInitIt++; | ||||||
8814 | |||||||
8815 | // If there is no initializer, either this is a VLA or an error has | ||||||
8816 | // occurred. | ||||||
8817 | if (!CurFieldInit) | ||||||
8818 | return Error(E); | ||||||
8819 | |||||||
8820 | APValue &FieldVal = Result.getStructField(Field->getFieldIndex()); | ||||||
8821 | if (!EvaluateInPlace(FieldVal, Info, This, CurFieldInit)) { | ||||||
8822 | if (!Info.keepEvaluatingAfterFailure()) | ||||||
8823 | return false; | ||||||
8824 | Success = false; | ||||||
8825 | } | ||||||
8826 | ++CaptureIt; | ||||||
8827 | } | ||||||
8828 | return Success; | ||||||
8829 | } | ||||||
8830 | |||||||
8831 | static bool EvaluateRecord(const Expr *E, const LValue &This, | ||||||
8832 | APValue &Result, EvalInfo &Info) { | ||||||
8833 | assert(E->isRValue() && E->getType()->isRecordType() &&((E->isRValue() && E->getType()->isRecordType () && "can't evaluate expression as a record rvalue") ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isRecordType() && \"can't evaluate expression as a record rvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8834, __PRETTY_FUNCTION__)) | ||||||
8834 | "can't evaluate expression as a record rvalue")((E->isRValue() && E->getType()->isRecordType () && "can't evaluate expression as a record rvalue") ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isRecordType() && \"can't evaluate expression as a record rvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8834, __PRETTY_FUNCTION__)); | ||||||
8835 | return RecordExprEvaluator(Info, This, Result).Visit(E); | ||||||
8836 | } | ||||||
8837 | |||||||
8838 | //===----------------------------------------------------------------------===// | ||||||
8839 | // Temporary Evaluation | ||||||
8840 | // | ||||||
8841 | // Temporaries are represented in the AST as rvalues, but generally behave like | ||||||
8842 | // lvalues. The full-object of which the temporary is a subobject is implicitly | ||||||
8843 | // materialized so that a reference can bind to it. | ||||||
8844 | //===----------------------------------------------------------------------===// | ||||||
8845 | namespace { | ||||||
8846 | class TemporaryExprEvaluator | ||||||
8847 | : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { | ||||||
8848 | public: | ||||||
8849 | TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : | ||||||
8850 | LValueExprEvaluatorBaseTy(Info, Result, false) {} | ||||||
8851 | |||||||
8852 | /// Visit an expression which constructs the value of this temporary. | ||||||
8853 | bool VisitConstructExpr(const Expr *E) { | ||||||
8854 | APValue &Value = | ||||||
8855 | Info.CurrentCall->createTemporary(E, E->getType(), false, Result); | ||||||
8856 | return EvaluateInPlace(Value, Info, Result, E); | ||||||
8857 | } | ||||||
8858 | |||||||
8859 | bool VisitCastExpr(const CastExpr *E) { | ||||||
8860 | switch (E->getCastKind()) { | ||||||
8861 | default: | ||||||
8862 | return LValueExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
8863 | |||||||
8864 | case CK_ConstructorConversion: | ||||||
8865 | return VisitConstructExpr(E->getSubExpr()); | ||||||
8866 | } | ||||||
8867 | } | ||||||
8868 | bool VisitInitListExpr(const InitListExpr *E) { | ||||||
8869 | return VisitConstructExpr(E); | ||||||
8870 | } | ||||||
8871 | bool VisitCXXConstructExpr(const CXXConstructExpr *E) { | ||||||
8872 | return VisitConstructExpr(E); | ||||||
8873 | } | ||||||
8874 | bool VisitCallExpr(const CallExpr *E) { | ||||||
8875 | return VisitConstructExpr(E); | ||||||
8876 | } | ||||||
8877 | bool VisitCXXStdInitializerListExpr(const CXXStdInitializerListExpr *E) { | ||||||
8878 | return VisitConstructExpr(E); | ||||||
8879 | } | ||||||
8880 | bool VisitLambdaExpr(const LambdaExpr *E) { | ||||||
8881 | return VisitConstructExpr(E); | ||||||
8882 | } | ||||||
8883 | }; | ||||||
8884 | } // end anonymous namespace | ||||||
8885 | |||||||
8886 | /// Evaluate an expression of record type as a temporary. | ||||||
8887 | static bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { | ||||||
8888 | assert(E->isRValue() && E->getType()->isRecordType())((E->isRValue() && E->getType()->isRecordType ()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isRecordType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8888, __PRETTY_FUNCTION__)); | ||||||
8889 | return TemporaryExprEvaluator(Info, Result).Visit(E); | ||||||
8890 | } | ||||||
8891 | |||||||
8892 | //===----------------------------------------------------------------------===// | ||||||
8893 | // Vector Evaluation | ||||||
8894 | //===----------------------------------------------------------------------===// | ||||||
8895 | |||||||
8896 | namespace { | ||||||
8897 | class VectorExprEvaluator | ||||||
8898 | : public ExprEvaluatorBase<VectorExprEvaluator> { | ||||||
8899 | APValue &Result; | ||||||
8900 | public: | ||||||
8901 | |||||||
8902 | VectorExprEvaluator(EvalInfo &info, APValue &Result) | ||||||
8903 | : ExprEvaluatorBaseTy(info), Result(Result) {} | ||||||
8904 | |||||||
8905 | bool Success(ArrayRef<APValue> V, const Expr *E) { | ||||||
8906 | assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements())((V.size() == E->getType()->castAs<VectorType>()-> getNumElements()) ? static_cast<void> (0) : __assert_fail ("V.size() == E->getType()->castAs<VectorType>()->getNumElements()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8906, __PRETTY_FUNCTION__)); | ||||||
8907 | // FIXME: remove this APValue copy. | ||||||
8908 | Result = APValue(V.data(), V.size()); | ||||||
8909 | return true; | ||||||
8910 | } | ||||||
8911 | bool Success(const APValue &V, const Expr *E) { | ||||||
8912 | assert(V.isVector())((V.isVector()) ? static_cast<void> (0) : __assert_fail ("V.isVector()", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8912, __PRETTY_FUNCTION__)); | ||||||
8913 | Result = V; | ||||||
8914 | return true; | ||||||
8915 | } | ||||||
8916 | bool ZeroInitialization(const Expr *E); | ||||||
8917 | |||||||
8918 | bool VisitUnaryReal(const UnaryOperator *E) | ||||||
8919 | { return Visit(E->getSubExpr()); } | ||||||
8920 | bool VisitCastExpr(const CastExpr* E); | ||||||
8921 | bool VisitInitListExpr(const InitListExpr *E); | ||||||
8922 | bool VisitUnaryImag(const UnaryOperator *E); | ||||||
8923 | // FIXME: Missing: unary -, unary ~, binary add/sub/mul/div, | ||||||
8924 | // binary comparisons, binary and/or/xor, | ||||||
8925 | // shufflevector, ExtVectorElementExpr | ||||||
8926 | }; | ||||||
8927 | } // end anonymous namespace | ||||||
8928 | |||||||
8929 | static bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { | ||||||
8930 | assert(E->isRValue() && E->getType()->isVectorType() &&"not a vector rvalue")((E->isRValue() && E->getType()->isVectorType () &&"not a vector rvalue") ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isVectorType() &&\"not a vector rvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 8930, __PRETTY_FUNCTION__)); | ||||||
8931 | return VectorExprEvaluator(Info, Result).Visit(E); | ||||||
8932 | } | ||||||
8933 | |||||||
8934 | bool VectorExprEvaluator::VisitCastExpr(const CastExpr *E) { | ||||||
8935 | const VectorType *VTy = E->getType()->castAs<VectorType>(); | ||||||
8936 | unsigned NElts = VTy->getNumElements(); | ||||||
8937 | |||||||
8938 | const Expr *SE = E->getSubExpr(); | ||||||
8939 | QualType SETy = SE->getType(); | ||||||
8940 | |||||||
8941 | switch (E->getCastKind()) { | ||||||
8942 | case CK_VectorSplat: { | ||||||
8943 | APValue Val = APValue(); | ||||||
8944 | if (SETy->isIntegerType()) { | ||||||
8945 | APSInt IntResult; | ||||||
8946 | if (!EvaluateInteger(SE, IntResult, Info)) | ||||||
8947 | return false; | ||||||
8948 | Val = APValue(std::move(IntResult)); | ||||||
8949 | } else if (SETy->isRealFloatingType()) { | ||||||
8950 | APFloat FloatResult(0.0); | ||||||
8951 | if (!EvaluateFloat(SE, FloatResult, Info)) | ||||||
8952 | return false; | ||||||
8953 | Val = APValue(std::move(FloatResult)); | ||||||
8954 | } else { | ||||||
8955 | return Error(E); | ||||||
8956 | } | ||||||
8957 | |||||||
8958 | // Splat and create vector APValue. | ||||||
8959 | SmallVector<APValue, 4> Elts(NElts, Val); | ||||||
8960 | return Success(Elts, E); | ||||||
8961 | } | ||||||
8962 | case CK_BitCast: { | ||||||
8963 | // Evaluate the operand into an APInt we can extract from. | ||||||
8964 | llvm::APInt SValInt; | ||||||
8965 | if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) | ||||||
8966 | return false; | ||||||
8967 | // Extract the elements | ||||||
8968 | QualType EltTy = VTy->getElementType(); | ||||||
8969 | unsigned EltSize = Info.Ctx.getTypeSize(EltTy); | ||||||
8970 | bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); | ||||||
8971 | SmallVector<APValue, 4> Elts; | ||||||
8972 | if (EltTy->isRealFloatingType()) { | ||||||
8973 | const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); | ||||||
8974 | unsigned FloatEltSize = EltSize; | ||||||
8975 | if (&Sem == &APFloat::x87DoubleExtended()) | ||||||
8976 | FloatEltSize = 80; | ||||||
8977 | for (unsigned i = 0; i < NElts; i++) { | ||||||
8978 | llvm::APInt Elt; | ||||||
8979 | if (BigEndian) | ||||||
8980 | Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); | ||||||
8981 | else | ||||||
8982 | Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); | ||||||
8983 | Elts.push_back(APValue(APFloat(Sem, Elt))); | ||||||
8984 | } | ||||||
8985 | } else if (EltTy->isIntegerType()) { | ||||||
8986 | for (unsigned i = 0; i < NElts; i++) { | ||||||
8987 | llvm::APInt Elt; | ||||||
8988 | if (BigEndian) | ||||||
8989 | Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); | ||||||
8990 | else | ||||||
8991 | Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); | ||||||
8992 | Elts.push_back(APValue(APSInt(Elt, EltTy->isSignedIntegerType()))); | ||||||
8993 | } | ||||||
8994 | } else { | ||||||
8995 | return Error(E); | ||||||
8996 | } | ||||||
8997 | return Success(Elts, E); | ||||||
8998 | } | ||||||
8999 | default: | ||||||
9000 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
9001 | } | ||||||
9002 | } | ||||||
9003 | |||||||
9004 | bool | ||||||
9005 | VectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { | ||||||
9006 | const VectorType *VT = E->getType()->castAs<VectorType>(); | ||||||
9007 | unsigned NumInits = E->getNumInits(); | ||||||
9008 | unsigned NumElements = VT->getNumElements(); | ||||||
9009 | |||||||
9010 | QualType EltTy = VT->getElementType(); | ||||||
9011 | SmallVector<APValue, 4> Elements; | ||||||
9012 | |||||||
9013 | // The number of initializers can be less than the number of | ||||||
9014 | // vector elements. For OpenCL, this can be due to nested vector | ||||||
9015 | // initialization. For GCC compatibility, missing trailing elements | ||||||
9016 | // should be initialized with zeroes. | ||||||
9017 | unsigned CountInits = 0, CountElts = 0; | ||||||
9018 | while (CountElts < NumElements) { | ||||||
9019 | // Handle nested vector initialization. | ||||||
9020 | if (CountInits < NumInits | ||||||
9021 | && E->getInit(CountInits)->getType()->isVectorType()) { | ||||||
9022 | APValue v; | ||||||
9023 | if (!EvaluateVector(E->getInit(CountInits), v, Info)) | ||||||
9024 | return Error(E); | ||||||
9025 | unsigned vlen = v.getVectorLength(); | ||||||
9026 | for (unsigned j = 0; j < vlen; j++) | ||||||
9027 | Elements.push_back(v.getVectorElt(j)); | ||||||
9028 | CountElts += vlen; | ||||||
9029 | } else if (EltTy->isIntegerType()) { | ||||||
9030 | llvm::APSInt sInt(32); | ||||||
9031 | if (CountInits < NumInits) { | ||||||
9032 | if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) | ||||||
9033 | return false; | ||||||
9034 | } else // trailing integer zero. | ||||||
9035 | sInt = Info.Ctx.MakeIntValue(0, EltTy); | ||||||
9036 | Elements.push_back(APValue(sInt)); | ||||||
9037 | CountElts++; | ||||||
9038 | } else { | ||||||
9039 | llvm::APFloat f(0.0); | ||||||
9040 | if (CountInits < NumInits) { | ||||||
9041 | if (!EvaluateFloat(E->getInit(CountInits), f, Info)) | ||||||
9042 | return false; | ||||||
9043 | } else // trailing float zero. | ||||||
9044 | f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); | ||||||
9045 | Elements.push_back(APValue(f)); | ||||||
9046 | CountElts++; | ||||||
9047 | } | ||||||
9048 | CountInits++; | ||||||
9049 | } | ||||||
9050 | return Success(Elements, E); | ||||||
9051 | } | ||||||
9052 | |||||||
9053 | bool | ||||||
9054 | VectorExprEvaluator::ZeroInitialization(const Expr *E) { | ||||||
9055 | const VectorType *VT = E->getType()->getAs<VectorType>(); | ||||||
9056 | QualType EltTy = VT->getElementType(); | ||||||
9057 | APValue ZeroElement; | ||||||
9058 | if (EltTy->isIntegerType()) | ||||||
9059 | ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); | ||||||
9060 | else | ||||||
9061 | ZeroElement = | ||||||
9062 | APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); | ||||||
9063 | |||||||
9064 | SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); | ||||||
9065 | return Success(Elements, E); | ||||||
9066 | } | ||||||
9067 | |||||||
9068 | bool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { | ||||||
9069 | VisitIgnoredValue(E->getSubExpr()); | ||||||
9070 | return ZeroInitialization(E); | ||||||
9071 | } | ||||||
9072 | |||||||
9073 | //===----------------------------------------------------------------------===// | ||||||
9074 | // Array Evaluation | ||||||
9075 | //===----------------------------------------------------------------------===// | ||||||
9076 | |||||||
9077 | namespace { | ||||||
9078 | class ArrayExprEvaluator | ||||||
9079 | : public ExprEvaluatorBase<ArrayExprEvaluator> { | ||||||
9080 | const LValue &This; | ||||||
9081 | APValue &Result; | ||||||
9082 | public: | ||||||
9083 | |||||||
9084 | ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) | ||||||
9085 | : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} | ||||||
9086 | |||||||
9087 | bool Success(const APValue &V, const Expr *E) { | ||||||
9088 | assert(V.isArray() && "expected array")((V.isArray() && "expected array") ? static_cast<void > (0) : __assert_fail ("V.isArray() && \"expected array\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9088, __PRETTY_FUNCTION__)); | ||||||
9089 | Result = V; | ||||||
9090 | return true; | ||||||
9091 | } | ||||||
9092 | |||||||
9093 | bool ZeroInitialization(const Expr *E) { | ||||||
9094 | const ConstantArrayType *CAT = | ||||||
9095 | Info.Ctx.getAsConstantArrayType(E->getType()); | ||||||
9096 | if (!CAT) | ||||||
9097 | return Error(E); | ||||||
9098 | |||||||
9099 | Result = APValue(APValue::UninitArray(), 0, | ||||||
9100 | CAT->getSize().getZExtValue()); | ||||||
9101 | if (!Result.hasArrayFiller()) return true; | ||||||
9102 | |||||||
9103 | // Zero-initialize all elements. | ||||||
9104 | LValue Subobject = This; | ||||||
9105 | Subobject.addArray(Info, E, CAT); | ||||||
9106 | ImplicitValueInitExpr VIE(CAT->getElementType()); | ||||||
9107 | return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); | ||||||
9108 | } | ||||||
9109 | |||||||
9110 | bool VisitCallExpr(const CallExpr *E) { | ||||||
9111 | return handleCallExpr(E, Result, &This); | ||||||
9112 | } | ||||||
9113 | bool VisitInitListExpr(const InitListExpr *E, | ||||||
9114 | QualType AllocType = QualType()); | ||||||
9115 | bool VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E); | ||||||
9116 | bool VisitCXXConstructExpr(const CXXConstructExpr *E); | ||||||
9117 | bool VisitCXXConstructExpr(const CXXConstructExpr *E, | ||||||
9118 | const LValue &Subobject, | ||||||
9119 | APValue *Value, QualType Type); | ||||||
9120 | bool VisitStringLiteral(const StringLiteral *E, | ||||||
9121 | QualType AllocType = QualType()) { | ||||||
9122 | expandStringLiteral(Info, E, Result, AllocType); | ||||||
9123 | return true; | ||||||
9124 | } | ||||||
9125 | }; | ||||||
9126 | } // end anonymous namespace | ||||||
9127 | |||||||
9128 | static bool EvaluateArray(const Expr *E, const LValue &This, | ||||||
9129 | APValue &Result, EvalInfo &Info) { | ||||||
9130 | assert(E->isRValue() && E->getType()->isArrayType() && "not an array rvalue")((E->isRValue() && E->getType()->isArrayType () && "not an array rvalue") ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isArrayType() && \"not an array rvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9130, __PRETTY_FUNCTION__)); | ||||||
9131 | return ArrayExprEvaluator(Info, This, Result).Visit(E); | ||||||
9132 | } | ||||||
9133 | |||||||
9134 | static bool EvaluateArrayNewInitList(EvalInfo &Info, LValue &This, | ||||||
9135 | APValue &Result, const InitListExpr *ILE, | ||||||
9136 | QualType AllocType) { | ||||||
9137 | assert(ILE->isRValue() && ILE->getType()->isArrayType() &&((ILE->isRValue() && ILE->getType()->isArrayType () && "not an array rvalue") ? static_cast<void> (0) : __assert_fail ("ILE->isRValue() && ILE->getType()->isArrayType() && \"not an array rvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9138, __PRETTY_FUNCTION__)) | ||||||
9138 | "not an array rvalue")((ILE->isRValue() && ILE->getType()->isArrayType () && "not an array rvalue") ? static_cast<void> (0) : __assert_fail ("ILE->isRValue() && ILE->getType()->isArrayType() && \"not an array rvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9138, __PRETTY_FUNCTION__)); | ||||||
9139 | return ArrayExprEvaluator(Info, This, Result) | ||||||
9140 | .VisitInitListExpr(ILE, AllocType); | ||||||
9141 | } | ||||||
9142 | |||||||
9143 | // Return true iff the given array filler may depend on the element index. | ||||||
9144 | static bool MaybeElementDependentArrayFiller(const Expr *FillerExpr) { | ||||||
9145 | // For now, just whitelist non-class value-initialization and initialization | ||||||
9146 | // lists comprised of them. | ||||||
9147 | if (isa<ImplicitValueInitExpr>(FillerExpr)) | ||||||
9148 | return false; | ||||||
9149 | if (const InitListExpr *ILE = dyn_cast<InitListExpr>(FillerExpr)) { | ||||||
9150 | for (unsigned I = 0, E = ILE->getNumInits(); I != E; ++I) { | ||||||
9151 | if (MaybeElementDependentArrayFiller(ILE->getInit(I))) | ||||||
9152 | return true; | ||||||
9153 | } | ||||||
9154 | return false; | ||||||
9155 | } | ||||||
9156 | return true; | ||||||
9157 | } | ||||||
9158 | |||||||
9159 | bool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E, | ||||||
9160 | QualType AllocType) { | ||||||
9161 | const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType( | ||||||
9162 | AllocType.isNull() ? E->getType() : AllocType); | ||||||
9163 | if (!CAT) | ||||||
9164 | return Error(E); | ||||||
9165 | |||||||
9166 | // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] | ||||||
9167 | // an appropriately-typed string literal enclosed in braces. | ||||||
9168 | if (E->isStringLiteralInit()) { | ||||||
9169 | auto *SL = dyn_cast<StringLiteral>(E->getInit(0)->IgnoreParens()); | ||||||
9170 | // FIXME: Support ObjCEncodeExpr here once we support it in | ||||||
9171 | // ArrayExprEvaluator generally. | ||||||
9172 | if (!SL) | ||||||
9173 | return Error(E); | ||||||
9174 | return VisitStringLiteral(SL, AllocType); | ||||||
9175 | } | ||||||
9176 | |||||||
9177 | bool Success = true; | ||||||
9178 | |||||||
9179 | assert((!Result.isArray() || Result.getArrayInitializedElts() == 0) &&(((!Result.isArray() || Result.getArrayInitializedElts() == 0 ) && "zero-initialized array shouldn't have any initialized elts" ) ? static_cast<void> (0) : __assert_fail ("(!Result.isArray() || Result.getArrayInitializedElts() == 0) && \"zero-initialized array shouldn't have any initialized elts\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9180, __PRETTY_FUNCTION__)) | ||||||
9180 | "zero-initialized array shouldn't have any initialized elts")(((!Result.isArray() || Result.getArrayInitializedElts() == 0 ) && "zero-initialized array shouldn't have any initialized elts" ) ? static_cast<void> (0) : __assert_fail ("(!Result.isArray() || Result.getArrayInitializedElts() == 0) && \"zero-initialized array shouldn't have any initialized elts\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9180, __PRETTY_FUNCTION__)); | ||||||
9181 | APValue Filler; | ||||||
9182 | if (Result.isArray() && Result.hasArrayFiller()) | ||||||
9183 | Filler = Result.getArrayFiller(); | ||||||
9184 | |||||||
9185 | unsigned NumEltsToInit = E->getNumInits(); | ||||||
9186 | unsigned NumElts = CAT->getSize().getZExtValue(); | ||||||
9187 | const Expr *FillerExpr = E->hasArrayFiller() ? E->getArrayFiller() : nullptr; | ||||||
9188 | |||||||
9189 | // If the initializer might depend on the array index, run it for each | ||||||
9190 | // array element. | ||||||
9191 | if (NumEltsToInit != NumElts && MaybeElementDependentArrayFiller(FillerExpr)) | ||||||
9192 | NumEltsToInit = NumElts; | ||||||
9193 | |||||||
9194 | LLVM_DEBUG(llvm::dbgs() << "The number of elements to initialize: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("exprconstant")) { llvm::dbgs() << "The number of elements to initialize: " << NumEltsToInit << ".\n"; } } while (false) | ||||||
9195 | << NumEltsToInit << ".\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("exprconstant")) { llvm::dbgs() << "The number of elements to initialize: " << NumEltsToInit << ".\n"; } } while (false); | ||||||
9196 | |||||||
9197 | Result = APValue(APValue::UninitArray(), NumEltsToInit, NumElts); | ||||||
9198 | |||||||
9199 | // If the array was previously zero-initialized, preserve the | ||||||
9200 | // zero-initialized values. | ||||||
9201 | if (Filler.hasValue()) { | ||||||
9202 | for (unsigned I = 0, E = Result.getArrayInitializedElts(); I != E; ++I) | ||||||
9203 | Result.getArrayInitializedElt(I) = Filler; | ||||||
9204 | if (Result.hasArrayFiller()) | ||||||
9205 | Result.getArrayFiller() = Filler; | ||||||
9206 | } | ||||||
9207 | |||||||
9208 | LValue Subobject = This; | ||||||
9209 | Subobject.addArray(Info, E, CAT); | ||||||
9210 | for (unsigned Index = 0; Index != NumEltsToInit; ++Index) { | ||||||
9211 | const Expr *Init = | ||||||
9212 | Index < E->getNumInits() ? E->getInit(Index) : FillerExpr; | ||||||
9213 | if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), | ||||||
9214 | Info, Subobject, Init) || | ||||||
9215 | !HandleLValueArrayAdjustment(Info, Init, Subobject, | ||||||
9216 | CAT->getElementType(), 1)) { | ||||||
9217 | if (!Info.noteFailure()) | ||||||
9218 | return false; | ||||||
9219 | Success = false; | ||||||
9220 | } | ||||||
9221 | } | ||||||
9222 | |||||||
9223 | if (!Result.hasArrayFiller()) | ||||||
9224 | return Success; | ||||||
9225 | |||||||
9226 | // If we get here, we have a trivial filler, which we can just evaluate | ||||||
9227 | // once and splat over the rest of the array elements. | ||||||
9228 | assert(FillerExpr && "no array filler for incomplete init list")((FillerExpr && "no array filler for incomplete init list" ) ? static_cast<void> (0) : __assert_fail ("FillerExpr && \"no array filler for incomplete init list\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9228, __PRETTY_FUNCTION__)); | ||||||
9229 | return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, | ||||||
9230 | FillerExpr) && Success; | ||||||
9231 | } | ||||||
9232 | |||||||
9233 | bool ArrayExprEvaluator::VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E) { | ||||||
9234 | LValue CommonLV; | ||||||
9235 | if (E->getCommonExpr() && | ||||||
9236 | !Evaluate(Info.CurrentCall->createTemporary( | ||||||
9237 | E->getCommonExpr(), | ||||||
9238 | getStorageType(Info.Ctx, E->getCommonExpr()), false, | ||||||
9239 | CommonLV), | ||||||
9240 | Info, E->getCommonExpr()->getSourceExpr())) | ||||||
9241 | return false; | ||||||
9242 | |||||||
9243 | auto *CAT = cast<ConstantArrayType>(E->getType()->castAsArrayTypeUnsafe()); | ||||||
9244 | |||||||
9245 | uint64_t Elements = CAT->getSize().getZExtValue(); | ||||||
9246 | Result = APValue(APValue::UninitArray(), Elements, Elements); | ||||||
9247 | |||||||
9248 | LValue Subobject = This; | ||||||
9249 | Subobject.addArray(Info, E, CAT); | ||||||
9250 | |||||||
9251 | bool Success = true; | ||||||
9252 | for (EvalInfo::ArrayInitLoopIndex Index(Info); Index != Elements; ++Index) { | ||||||
9253 | if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), | ||||||
9254 | Info, Subobject, E->getSubExpr()) || | ||||||
9255 | !HandleLValueArrayAdjustment(Info, E, Subobject, | ||||||
9256 | CAT->getElementType(), 1)) { | ||||||
9257 | if (!Info.noteFailure()) | ||||||
9258 | return false; | ||||||
9259 | Success = false; | ||||||
9260 | } | ||||||
9261 | } | ||||||
9262 | |||||||
9263 | return Success; | ||||||
9264 | } | ||||||
9265 | |||||||
9266 | bool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { | ||||||
9267 | return VisitCXXConstructExpr(E, This, &Result, E->getType()); | ||||||
9268 | } | ||||||
9269 | |||||||
9270 | bool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E, | ||||||
9271 | const LValue &Subobject, | ||||||
9272 | APValue *Value, | ||||||
9273 | QualType Type) { | ||||||
9274 | bool HadZeroInit = Value->hasValue(); | ||||||
9275 | |||||||
9276 | if (const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(Type)) { | ||||||
9277 | unsigned N = CAT->getSize().getZExtValue(); | ||||||
9278 | |||||||
9279 | // Preserve the array filler if we had prior zero-initialization. | ||||||
9280 | APValue Filler = | ||||||
9281 | HadZeroInit && Value->hasArrayFiller() ? Value->getArrayFiller() | ||||||
9282 | : APValue(); | ||||||
9283 | |||||||
9284 | *Value = APValue(APValue::UninitArray(), N, N); | ||||||
9285 | |||||||
9286 | if (HadZeroInit) | ||||||
9287 | for (unsigned I = 0; I != N; ++I) | ||||||
9288 | Value->getArrayInitializedElt(I) = Filler; | ||||||
9289 | |||||||
9290 | // Initialize the elements. | ||||||
9291 | LValue ArrayElt = Subobject; | ||||||
9292 | ArrayElt.addArray(Info, E, CAT); | ||||||
9293 | for (unsigned I = 0; I != N; ++I) | ||||||
9294 | if (!VisitCXXConstructExpr(E, ArrayElt, &Value->getArrayInitializedElt(I), | ||||||
9295 | CAT->getElementType()) || | ||||||
9296 | !HandleLValueArrayAdjustment(Info, E, ArrayElt, | ||||||
9297 | CAT->getElementType(), 1)) | ||||||
9298 | return false; | ||||||
9299 | |||||||
9300 | return true; | ||||||
9301 | } | ||||||
9302 | |||||||
9303 | if (!Type->isRecordType()) | ||||||
9304 | return Error(E); | ||||||
9305 | |||||||
9306 | return RecordExprEvaluator(Info, Subobject, *Value) | ||||||
9307 | .VisitCXXConstructExpr(E, Type); | ||||||
9308 | } | ||||||
9309 | |||||||
9310 | //===----------------------------------------------------------------------===// | ||||||
9311 | // Integer Evaluation | ||||||
9312 | // | ||||||
9313 | // As a GNU extension, we support casting pointers to sufficiently-wide integer | ||||||
9314 | // types and back in constant folding. Integer values are thus represented | ||||||
9315 | // either as an integer-valued APValue, or as an lvalue-valued APValue. | ||||||
9316 | //===----------------------------------------------------------------------===// | ||||||
9317 | |||||||
9318 | namespace { | ||||||
9319 | class IntExprEvaluator | ||||||
9320 | : public ExprEvaluatorBase<IntExprEvaluator> { | ||||||
9321 | APValue &Result; | ||||||
9322 | public: | ||||||
9323 | IntExprEvaluator(EvalInfo &info, APValue &result) | ||||||
9324 | : ExprEvaluatorBaseTy(info), Result(result) {} | ||||||
9325 | |||||||
9326 | bool Success(const llvm::APSInt &SI, const Expr *E, APValue &Result) { | ||||||
9327 | assert(E->getType()->isIntegralOrEnumerationType() &&((E->getType()->isIntegralOrEnumerationType() && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9328, __PRETTY_FUNCTION__)) | ||||||
9328 | "Invalid evaluation result.")((E->getType()->isIntegralOrEnumerationType() && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9328, __PRETTY_FUNCTION__)); | ||||||
9329 | assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() &&((SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType () && "Invalid evaluation result.") ? static_cast< void> (0) : __assert_fail ("SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9330, __PRETTY_FUNCTION__)) | ||||||
9330 | "Invalid evaluation result.")((SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType () && "Invalid evaluation result.") ? static_cast< void> (0) : __assert_fail ("SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9330, __PRETTY_FUNCTION__)); | ||||||
9331 | assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&((SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9332, __PRETTY_FUNCTION__)) | ||||||
9332 | "Invalid evaluation result.")((SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9332, __PRETTY_FUNCTION__)); | ||||||
9333 | Result = APValue(SI); | ||||||
9334 | return true; | ||||||
9335 | } | ||||||
9336 | bool Success(const llvm::APSInt &SI, const Expr *E) { | ||||||
9337 | return Success(SI, E, Result); | ||||||
9338 | } | ||||||
9339 | |||||||
9340 | bool Success(const llvm::APInt &I, const Expr *E, APValue &Result) { | ||||||
9341 | assert(E->getType()->isIntegralOrEnumerationType() &&((E->getType()->isIntegralOrEnumerationType() && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9342, __PRETTY_FUNCTION__)) | ||||||
9342 | "Invalid evaluation result.")((E->getType()->isIntegralOrEnumerationType() && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9342, __PRETTY_FUNCTION__)); | ||||||
9343 | assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&((I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9344, __PRETTY_FUNCTION__)) | ||||||
9344 | "Invalid evaluation result.")((I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9344, __PRETTY_FUNCTION__)); | ||||||
9345 | Result = APValue(APSInt(I)); | ||||||
9346 | Result.getInt().setIsUnsigned( | ||||||
9347 | E->getType()->isUnsignedIntegerOrEnumerationType()); | ||||||
9348 | return true; | ||||||
9349 | } | ||||||
9350 | bool Success(const llvm::APInt &I, const Expr *E) { | ||||||
9351 | return Success(I, E, Result); | ||||||
9352 | } | ||||||
9353 | |||||||
9354 | bool Success(uint64_t Value, const Expr *E, APValue &Result) { | ||||||
9355 | assert(E->getType()->isIntegralOrEnumerationType() &&((E->getType()->isIntegralOrEnumerationType() && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9356, __PRETTY_FUNCTION__)) | ||||||
9356 | "Invalid evaluation result.")((E->getType()->isIntegralOrEnumerationType() && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9356, __PRETTY_FUNCTION__)); | ||||||
9357 | Result = APValue(Info.Ctx.MakeIntValue(Value, E->getType())); | ||||||
9358 | return true; | ||||||
9359 | } | ||||||
9360 | bool Success(uint64_t Value, const Expr *E) { | ||||||
9361 | return Success(Value, E, Result); | ||||||
9362 | } | ||||||
9363 | |||||||
9364 | bool Success(CharUnits Size, const Expr *E) { | ||||||
9365 | return Success(Size.getQuantity(), E); | ||||||
9366 | } | ||||||
9367 | |||||||
9368 | bool Success(const APValue &V, const Expr *E) { | ||||||
9369 | if (V.isLValue() || V.isAddrLabelDiff() || V.isIndeterminate()) { | ||||||
9370 | Result = V; | ||||||
9371 | return true; | ||||||
9372 | } | ||||||
9373 | return Success(V.getInt(), E); | ||||||
9374 | } | ||||||
9375 | |||||||
9376 | bool ZeroInitialization(const Expr *E) { return Success(0, E); } | ||||||
9377 | |||||||
9378 | //===--------------------------------------------------------------------===// | ||||||
9379 | // Visitor Methods | ||||||
9380 | //===--------------------------------------------------------------------===// | ||||||
9381 | |||||||
9382 | bool VisitConstantExpr(const ConstantExpr *E); | ||||||
9383 | |||||||
9384 | bool VisitIntegerLiteral(const IntegerLiteral *E) { | ||||||
9385 | return Success(E->getValue(), E); | ||||||
9386 | } | ||||||
9387 | bool VisitCharacterLiteral(const CharacterLiteral *E) { | ||||||
9388 | return Success(E->getValue(), E); | ||||||
9389 | } | ||||||
9390 | |||||||
9391 | bool CheckReferencedDecl(const Expr *E, const Decl *D); | ||||||
9392 | bool VisitDeclRefExpr(const DeclRefExpr *E) { | ||||||
9393 | if (CheckReferencedDecl(E, E->getDecl())) | ||||||
9394 | return true; | ||||||
9395 | |||||||
9396 | return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); | ||||||
9397 | } | ||||||
9398 | bool VisitMemberExpr(const MemberExpr *E) { | ||||||
9399 | if (CheckReferencedDecl(E, E->getMemberDecl())) { | ||||||
9400 | VisitIgnoredBaseExpression(E->getBase()); | ||||||
9401 | return true; | ||||||
9402 | } | ||||||
9403 | |||||||
9404 | return ExprEvaluatorBaseTy::VisitMemberExpr(E); | ||||||
9405 | } | ||||||
9406 | |||||||
9407 | bool VisitCallExpr(const CallExpr *E); | ||||||
9408 | bool VisitBuiltinCallExpr(const CallExpr *E, unsigned BuiltinOp); | ||||||
9409 | bool VisitBinaryOperator(const BinaryOperator *E); | ||||||
9410 | bool VisitOffsetOfExpr(const OffsetOfExpr *E); | ||||||
9411 | bool VisitUnaryOperator(const UnaryOperator *E); | ||||||
9412 | |||||||
9413 | bool VisitCastExpr(const CastExpr* E); | ||||||
9414 | bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); | ||||||
9415 | |||||||
9416 | bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { | ||||||
9417 | return Success(E->getValue(), E); | ||||||
9418 | } | ||||||
9419 | |||||||
9420 | bool VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) { | ||||||
9421 | return Success(E->getValue(), E); | ||||||
9422 | } | ||||||
9423 | |||||||
9424 | bool VisitArrayInitIndexExpr(const ArrayInitIndexExpr *E) { | ||||||
9425 | if (Info.ArrayInitIndex == uint64_t(-1)) { | ||||||
9426 | // We were asked to evaluate this subexpression independent of the | ||||||
9427 | // enclosing ArrayInitLoopExpr. We can't do that. | ||||||
9428 | Info.FFDiag(E); | ||||||
9429 | return false; | ||||||
9430 | } | ||||||
9431 | return Success(Info.ArrayInitIndex, E); | ||||||
9432 | } | ||||||
9433 | |||||||
9434 | // Note, GNU defines __null as an integer, not a pointer. | ||||||
9435 | bool VisitGNUNullExpr(const GNUNullExpr *E) { | ||||||
9436 | return ZeroInitialization(E); | ||||||
9437 | } | ||||||
9438 | |||||||
9439 | bool VisitTypeTraitExpr(const TypeTraitExpr *E) { | ||||||
9440 | return Success(E->getValue(), E); | ||||||
9441 | } | ||||||
9442 | |||||||
9443 | bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { | ||||||
9444 | return Success(E->getValue(), E); | ||||||
9445 | } | ||||||
9446 | |||||||
9447 | bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { | ||||||
9448 | return Success(E->getValue(), E); | ||||||
9449 | } | ||||||
9450 | |||||||
9451 | bool VisitUnaryReal(const UnaryOperator *E); | ||||||
9452 | bool VisitUnaryImag(const UnaryOperator *E); | ||||||
9453 | |||||||
9454 | bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); | ||||||
9455 | bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); | ||||||
9456 | bool VisitSourceLocExpr(const SourceLocExpr *E); | ||||||
9457 | // FIXME: Missing: array subscript of vector, member of vector | ||||||
9458 | }; | ||||||
9459 | |||||||
9460 | class FixedPointExprEvaluator | ||||||
9461 | : public ExprEvaluatorBase<FixedPointExprEvaluator> { | ||||||
9462 | APValue &Result; | ||||||
9463 | |||||||
9464 | public: | ||||||
9465 | FixedPointExprEvaluator(EvalInfo &info, APValue &result) | ||||||
9466 | : ExprEvaluatorBaseTy(info), Result(result) {} | ||||||
9467 | |||||||
9468 | bool Success(const llvm::APInt &I, const Expr *E) { | ||||||
9469 | return Success( | ||||||
9470 | APFixedPoint(I, Info.Ctx.getFixedPointSemantics(E->getType())), E); | ||||||
9471 | } | ||||||
9472 | |||||||
9473 | bool Success(uint64_t Value, const Expr *E) { | ||||||
9474 | return Success( | ||||||
9475 | APFixedPoint(Value, Info.Ctx.getFixedPointSemantics(E->getType())), E); | ||||||
9476 | } | ||||||
9477 | |||||||
9478 | bool Success(const APValue &V, const Expr *E) { | ||||||
9479 | return Success(V.getFixedPoint(), E); | ||||||
9480 | } | ||||||
9481 | |||||||
9482 | bool Success(const APFixedPoint &V, const Expr *E) { | ||||||
9483 | assert(E->getType()->isFixedPointType() && "Invalid evaluation result.")((E->getType()->isFixedPointType() && "Invalid evaluation result." ) ? static_cast<void> (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9483, __PRETTY_FUNCTION__)); | ||||||
9484 | assert(V.getWidth() == Info.Ctx.getIntWidth(E->getType()) &&((V.getWidth() == Info.Ctx.getIntWidth(E->getType()) && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("V.getWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9485, __PRETTY_FUNCTION__)) | ||||||
9485 | "Invalid evaluation result.")((V.getWidth() == Info.Ctx.getIntWidth(E->getType()) && "Invalid evaluation result.") ? static_cast<void> (0) : __assert_fail ("V.getWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9485, __PRETTY_FUNCTION__)); | ||||||
9486 | Result = APValue(V); | ||||||
9487 | return true; | ||||||
9488 | } | ||||||
9489 | |||||||
9490 | //===--------------------------------------------------------------------===// | ||||||
9491 | // Visitor Methods | ||||||
9492 | //===--------------------------------------------------------------------===// | ||||||
9493 | |||||||
9494 | bool VisitFixedPointLiteral(const FixedPointLiteral *E) { | ||||||
9495 | return Success(E->getValue(), E); | ||||||
9496 | } | ||||||
9497 | |||||||
9498 | bool VisitCastExpr(const CastExpr *E); | ||||||
9499 | bool VisitUnaryOperator(const UnaryOperator *E); | ||||||
9500 | bool VisitBinaryOperator(const BinaryOperator *E); | ||||||
9501 | }; | ||||||
9502 | } // end anonymous namespace | ||||||
9503 | |||||||
9504 | /// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and | ||||||
9505 | /// produce either the integer value or a pointer. | ||||||
9506 | /// | ||||||
9507 | /// GCC has a heinous extension which folds casts between pointer types and | ||||||
9508 | /// pointer-sized integral types. We support this by allowing the evaluation of | ||||||
9509 | /// an integer rvalue to produce a pointer (represented as an lvalue) instead. | ||||||
9510 | /// Some simple arithmetic on such values is supported (they are treated much | ||||||
9511 | /// like char*). | ||||||
9512 | static bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, | ||||||
9513 | EvalInfo &Info) { | ||||||
9514 | assert(E->isRValue() && E->getType()->isIntegralOrEnumerationType())((E->isRValue() && E->getType()->isIntegralOrEnumerationType ()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isIntegralOrEnumerationType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9514, __PRETTY_FUNCTION__)); | ||||||
9515 | return IntExprEvaluator(Info, Result).Visit(E); | ||||||
9516 | } | ||||||
9517 | |||||||
9518 | static bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { | ||||||
9519 | APValue Val; | ||||||
9520 | if (!EvaluateIntegerOrLValue(E, Val, Info)) | ||||||
9521 | return false; | ||||||
9522 | if (!Val.isInt()) { | ||||||
9523 | // FIXME: It would be better to produce the diagnostic for casting | ||||||
9524 | // a pointer to an integer. | ||||||
9525 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
9526 | return false; | ||||||
9527 | } | ||||||
9528 | Result = Val.getInt(); | ||||||
9529 | return true; | ||||||
9530 | } | ||||||
9531 | |||||||
9532 | bool IntExprEvaluator::VisitSourceLocExpr(const SourceLocExpr *E) { | ||||||
9533 | APValue Evaluated = E->EvaluateInContext( | ||||||
9534 | Info.Ctx, Info.CurrentCall->CurSourceLocExprScope.getDefaultExpr()); | ||||||
9535 | return Success(Evaluated, E); | ||||||
9536 | } | ||||||
9537 | |||||||
9538 | static bool EvaluateFixedPoint(const Expr *E, APFixedPoint &Result, | ||||||
9539 | EvalInfo &Info) { | ||||||
9540 | if (E->getType()->isFixedPointType()) { | ||||||
9541 | APValue Val; | ||||||
9542 | if (!FixedPointExprEvaluator(Info, Val).Visit(E)) | ||||||
9543 | return false; | ||||||
9544 | if (!Val.isFixedPoint()) | ||||||
9545 | return false; | ||||||
9546 | |||||||
9547 | Result = Val.getFixedPoint(); | ||||||
9548 | return true; | ||||||
9549 | } | ||||||
9550 | return false; | ||||||
9551 | } | ||||||
9552 | |||||||
9553 | static bool EvaluateFixedPointOrInteger(const Expr *E, APFixedPoint &Result, | ||||||
9554 | EvalInfo &Info) { | ||||||
9555 | if (E->getType()->isIntegerType()) { | ||||||
9556 | auto FXSema = Info.Ctx.getFixedPointSemantics(E->getType()); | ||||||
9557 | APSInt Val; | ||||||
9558 | if (!EvaluateInteger(E, Val, Info)) | ||||||
9559 | return false; | ||||||
9560 | Result = APFixedPoint(Val, FXSema); | ||||||
9561 | return true; | ||||||
9562 | } else if (E->getType()->isFixedPointType()) { | ||||||
9563 | return EvaluateFixedPoint(E, Result, Info); | ||||||
9564 | } | ||||||
9565 | return false; | ||||||
9566 | } | ||||||
9567 | |||||||
9568 | /// Check whether the given declaration can be directly converted to an integral | ||||||
9569 | /// rvalue. If not, no diagnostic is produced; there are other things we can | ||||||
9570 | /// try. | ||||||
9571 | bool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { | ||||||
9572 | // Enums are integer constant exprs. | ||||||
9573 | if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { | ||||||
9574 | // Check for signedness/width mismatches between E type and ECD value. | ||||||
9575 | bool SameSign = (ECD->getInitVal().isSigned() | ||||||
9576 | == E->getType()->isSignedIntegerOrEnumerationType()); | ||||||
9577 | bool SameWidth = (ECD->getInitVal().getBitWidth() | ||||||
9578 | == Info.Ctx.getIntWidth(E->getType())); | ||||||
9579 | if (SameSign && SameWidth) | ||||||
9580 | return Success(ECD->getInitVal(), E); | ||||||
9581 | else { | ||||||
9582 | // Get rid of mismatch (otherwise Success assertions will fail) | ||||||
9583 | // by computing a new value matching the type of E. | ||||||
9584 | llvm::APSInt Val = ECD->getInitVal(); | ||||||
9585 | if (!SameSign) | ||||||
9586 | Val.setIsSigned(!ECD->getInitVal().isSigned()); | ||||||
9587 | if (!SameWidth) | ||||||
9588 | Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); | ||||||
9589 | return Success(Val, E); | ||||||
9590 | } | ||||||
9591 | } | ||||||
9592 | return false; | ||||||
9593 | } | ||||||
9594 | |||||||
9595 | /// Values returned by __builtin_classify_type, chosen to match the values | ||||||
9596 | /// produced by GCC's builtin. | ||||||
9597 | enum class GCCTypeClass { | ||||||
9598 | None = -1, | ||||||
9599 | Void = 0, | ||||||
9600 | Integer = 1, | ||||||
9601 | // GCC reserves 2 for character types, but instead classifies them as | ||||||
9602 | // integers. | ||||||
9603 | Enum = 3, | ||||||
9604 | Bool = 4, | ||||||
9605 | Pointer = 5, | ||||||
9606 | // GCC reserves 6 for references, but appears to never use it (because | ||||||
9607 | // expressions never have reference type, presumably). | ||||||
9608 | PointerToDataMember = 7, | ||||||
9609 | RealFloat = 8, | ||||||
9610 | Complex = 9, | ||||||
9611 | // GCC reserves 10 for functions, but does not use it since GCC version 6 due | ||||||
9612 | // to decay to pointer. (Prior to version 6 it was only used in C++ mode). | ||||||
9613 | // GCC claims to reserve 11 for pointers to member functions, but *actually* | ||||||
9614 | // uses 12 for that purpose, same as for a class or struct. Maybe it | ||||||
9615 | // internally implements a pointer to member as a struct? Who knows. | ||||||
9616 | PointerToMemberFunction = 12, // Not a bug, see above. | ||||||
9617 | ClassOrStruct = 12, | ||||||
9618 | Union = 13, | ||||||
9619 | // GCC reserves 14 for arrays, but does not use it since GCC version 6 due to | ||||||
9620 | // decay to pointer. (Prior to version 6 it was only used in C++ mode). | ||||||
9621 | // GCC reserves 15 for strings, but actually uses 5 (pointer) for string | ||||||
9622 | // literals. | ||||||
9623 | }; | ||||||
9624 | |||||||
9625 | /// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way | ||||||
9626 | /// as GCC. | ||||||
9627 | static GCCTypeClass | ||||||
9628 | EvaluateBuiltinClassifyType(QualType T, const LangOptions &LangOpts) { | ||||||
9629 | assert(!T->isDependentType() && "unexpected dependent type")((!T->isDependentType() && "unexpected dependent type" ) ? static_cast<void> (0) : __assert_fail ("!T->isDependentType() && \"unexpected dependent type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9629, __PRETTY_FUNCTION__)); | ||||||
9630 | |||||||
9631 | QualType CanTy = T.getCanonicalType(); | ||||||
9632 | const BuiltinType *BT = dyn_cast<BuiltinType>(CanTy); | ||||||
9633 | |||||||
9634 | switch (CanTy->getTypeClass()) { | ||||||
9635 | #define TYPE(ID, BASE) | ||||||
9636 | #define DEPENDENT_TYPE(ID, BASE) case Type::ID: | ||||||
9637 | #define NON_CANONICAL_TYPE(ID, BASE) case Type::ID: | ||||||
9638 | #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(ID, BASE) case Type::ID: | ||||||
9639 | #include "clang/AST/TypeNodes.def" | ||||||
9640 | case Type::Auto: | ||||||
9641 | case Type::DeducedTemplateSpecialization: | ||||||
9642 | llvm_unreachable("unexpected non-canonical or dependent type")::llvm::llvm_unreachable_internal("unexpected non-canonical or dependent type" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9642); | ||||||
9643 | |||||||
9644 | case Type::Builtin: | ||||||
9645 | switch (BT->getKind()) { | ||||||
9646 | #define BUILTIN_TYPE(ID, SINGLETON_ID) | ||||||
9647 | #define SIGNED_TYPE(ID, SINGLETON_ID) \ | ||||||
9648 | case BuiltinType::ID: return GCCTypeClass::Integer; | ||||||
9649 | #define FLOATING_TYPE(ID, SINGLETON_ID) \ | ||||||
9650 | case BuiltinType::ID: return GCCTypeClass::RealFloat; | ||||||
9651 | #define PLACEHOLDER_TYPE(ID, SINGLETON_ID) \ | ||||||
9652 | case BuiltinType::ID: break; | ||||||
9653 | #include "clang/AST/BuiltinTypes.def" | ||||||
9654 | case BuiltinType::Void: | ||||||
9655 | return GCCTypeClass::Void; | ||||||
9656 | |||||||
9657 | case BuiltinType::Bool: | ||||||
9658 | return GCCTypeClass::Bool; | ||||||
9659 | |||||||
9660 | case BuiltinType::Char_U: | ||||||
9661 | case BuiltinType::UChar: | ||||||
9662 | case BuiltinType::WChar_U: | ||||||
9663 | case BuiltinType::Char8: | ||||||
9664 | case BuiltinType::Char16: | ||||||
9665 | case BuiltinType::Char32: | ||||||
9666 | case BuiltinType::UShort: | ||||||
9667 | case BuiltinType::UInt: | ||||||
9668 | case BuiltinType::ULong: | ||||||
9669 | case BuiltinType::ULongLong: | ||||||
9670 | case BuiltinType::UInt128: | ||||||
9671 | return GCCTypeClass::Integer; | ||||||
9672 | |||||||
9673 | case BuiltinType::UShortAccum: | ||||||
9674 | case BuiltinType::UAccum: | ||||||
9675 | case BuiltinType::ULongAccum: | ||||||
9676 | case BuiltinType::UShortFract: | ||||||
9677 | case BuiltinType::UFract: | ||||||
9678 | case BuiltinType::ULongFract: | ||||||
9679 | case BuiltinType::SatUShortAccum: | ||||||
9680 | case BuiltinType::SatUAccum: | ||||||
9681 | case BuiltinType::SatULongAccum: | ||||||
9682 | case BuiltinType::SatUShortFract: | ||||||
9683 | case BuiltinType::SatUFract: | ||||||
9684 | case BuiltinType::SatULongFract: | ||||||
9685 | return GCCTypeClass::None; | ||||||
9686 | |||||||
9687 | case BuiltinType::NullPtr: | ||||||
9688 | |||||||
9689 | case BuiltinType::ObjCId: | ||||||
9690 | case BuiltinType::ObjCClass: | ||||||
9691 | case BuiltinType::ObjCSel: | ||||||
9692 | #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \ | ||||||
9693 | case BuiltinType::Id: | ||||||
9694 | #include "clang/Basic/OpenCLImageTypes.def" | ||||||
9695 | #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \ | ||||||
9696 | case BuiltinType::Id: | ||||||
9697 | #include "clang/Basic/OpenCLExtensionTypes.def" | ||||||
9698 | case BuiltinType::OCLSampler: | ||||||
9699 | case BuiltinType::OCLEvent: | ||||||
9700 | case BuiltinType::OCLClkEvent: | ||||||
9701 | case BuiltinType::OCLQueue: | ||||||
9702 | case BuiltinType::OCLReserveID: | ||||||
9703 | #define SVE_TYPE(Name, Id, SingletonId) \ | ||||||
9704 | case BuiltinType::Id: | ||||||
9705 | #include "clang/Basic/AArch64SVEACLETypes.def" | ||||||
9706 | return GCCTypeClass::None; | ||||||
9707 | |||||||
9708 | case BuiltinType::Dependent: | ||||||
9709 | llvm_unreachable("unexpected dependent type")::llvm::llvm_unreachable_internal("unexpected dependent type" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9709); | ||||||
9710 | }; | ||||||
9711 | llvm_unreachable("unexpected placeholder type")::llvm::llvm_unreachable_internal("unexpected placeholder type" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9711); | ||||||
9712 | |||||||
9713 | case Type::Enum: | ||||||
9714 | return LangOpts.CPlusPlus ? GCCTypeClass::Enum : GCCTypeClass::Integer; | ||||||
9715 | |||||||
9716 | case Type::Pointer: | ||||||
9717 | case Type::ConstantArray: | ||||||
9718 | case Type::VariableArray: | ||||||
9719 | case Type::IncompleteArray: | ||||||
9720 | case Type::FunctionNoProto: | ||||||
9721 | case Type::FunctionProto: | ||||||
9722 | return GCCTypeClass::Pointer; | ||||||
9723 | |||||||
9724 | case Type::MemberPointer: | ||||||
9725 | return CanTy->isMemberDataPointerType() | ||||||
9726 | ? GCCTypeClass::PointerToDataMember | ||||||
9727 | : GCCTypeClass::PointerToMemberFunction; | ||||||
9728 | |||||||
9729 | case Type::Complex: | ||||||
9730 | return GCCTypeClass::Complex; | ||||||
9731 | |||||||
9732 | case Type::Record: | ||||||
9733 | return CanTy->isUnionType() ? GCCTypeClass::Union | ||||||
9734 | : GCCTypeClass::ClassOrStruct; | ||||||
9735 | |||||||
9736 | case Type::Atomic: | ||||||
9737 | // GCC classifies _Atomic T the same as T. | ||||||
9738 | return EvaluateBuiltinClassifyType( | ||||||
9739 | CanTy->castAs<AtomicType>()->getValueType(), LangOpts); | ||||||
9740 | |||||||
9741 | case Type::BlockPointer: | ||||||
9742 | case Type::Vector: | ||||||
9743 | case Type::ExtVector: | ||||||
9744 | case Type::ObjCObject: | ||||||
9745 | case Type::ObjCInterface: | ||||||
9746 | case Type::ObjCObjectPointer: | ||||||
9747 | case Type::Pipe: | ||||||
9748 | // GCC classifies vectors as None. We follow its lead and classify all | ||||||
9749 | // other types that don't fit into the regular classification the same way. | ||||||
9750 | return GCCTypeClass::None; | ||||||
9751 | |||||||
9752 | case Type::LValueReference: | ||||||
9753 | case Type::RValueReference: | ||||||
9754 | llvm_unreachable("invalid type for expression")::llvm::llvm_unreachable_internal("invalid type for expression" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9754); | ||||||
9755 | } | ||||||
9756 | |||||||
9757 | llvm_unreachable("unexpected type class")::llvm::llvm_unreachable_internal("unexpected type class", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9757); | ||||||
9758 | } | ||||||
9759 | |||||||
9760 | /// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way | ||||||
9761 | /// as GCC. | ||||||
9762 | static GCCTypeClass | ||||||
9763 | EvaluateBuiltinClassifyType(const CallExpr *E, const LangOptions &LangOpts) { | ||||||
9764 | // If no argument was supplied, default to None. This isn't | ||||||
9765 | // ideal, however it is what gcc does. | ||||||
9766 | if (E->getNumArgs() == 0) | ||||||
9767 | return GCCTypeClass::None; | ||||||
9768 | |||||||
9769 | // FIXME: Bizarrely, GCC treats a call with more than one argument as not | ||||||
9770 | // being an ICE, but still folds it to a constant using the type of the first | ||||||
9771 | // argument. | ||||||
9772 | return EvaluateBuiltinClassifyType(E->getArg(0)->getType(), LangOpts); | ||||||
9773 | } | ||||||
9774 | |||||||
9775 | /// EvaluateBuiltinConstantPForLValue - Determine the result of | ||||||
9776 | /// __builtin_constant_p when applied to the given pointer. | ||||||
9777 | /// | ||||||
9778 | /// A pointer is only "constant" if it is null (or a pointer cast to integer) | ||||||
9779 | /// or it points to the first character of a string literal. | ||||||
9780 | static bool EvaluateBuiltinConstantPForLValue(const APValue &LV) { | ||||||
9781 | APValue::LValueBase Base = LV.getLValueBase(); | ||||||
9782 | if (Base.isNull()) { | ||||||
9783 | // A null base is acceptable. | ||||||
9784 | return true; | ||||||
9785 | } else if (const Expr *E = Base.dyn_cast<const Expr *>()) { | ||||||
9786 | if (!isa<StringLiteral>(E)) | ||||||
9787 | return false; | ||||||
9788 | return LV.getLValueOffset().isZero(); | ||||||
9789 | } else if (Base.is<TypeInfoLValue>()) { | ||||||
9790 | // Surprisingly, GCC considers __builtin_constant_p(&typeid(int)) to | ||||||
9791 | // evaluate to true. | ||||||
9792 | return true; | ||||||
9793 | } else { | ||||||
9794 | // Any other base is not constant enough for GCC. | ||||||
9795 | return false; | ||||||
9796 | } | ||||||
9797 | } | ||||||
9798 | |||||||
9799 | /// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to | ||||||
9800 | /// GCC as we can manage. | ||||||
9801 | static bool EvaluateBuiltinConstantP(EvalInfo &Info, const Expr *Arg) { | ||||||
9802 | // This evaluation is not permitted to have side-effects, so evaluate it in | ||||||
9803 | // a speculative evaluation context. | ||||||
9804 | SpeculativeEvaluationRAII SpeculativeEval(Info); | ||||||
9805 | |||||||
9806 | // Constant-folding is always enabled for the operand of __builtin_constant_p | ||||||
9807 | // (even when the enclosing evaluation context otherwise requires a strict | ||||||
9808 | // language-specific constant expression). | ||||||
9809 | FoldConstant Fold(Info, true); | ||||||
9810 | |||||||
9811 | QualType ArgType = Arg->getType(); | ||||||
9812 | |||||||
9813 | // __builtin_constant_p always has one operand. The rules which gcc follows | ||||||
9814 | // are not precisely documented, but are as follows: | ||||||
9815 | // | ||||||
9816 | // - If the operand is of integral, floating, complex or enumeration type, | ||||||
9817 | // and can be folded to a known value of that type, it returns 1. | ||||||
9818 | // - If the operand can be folded to a pointer to the first character | ||||||
9819 | // of a string literal (or such a pointer cast to an integral type) | ||||||
9820 | // or to a null pointer or an integer cast to a pointer, it returns 1. | ||||||
9821 | // | ||||||
9822 | // Otherwise, it returns 0. | ||||||
9823 | // | ||||||
9824 | // FIXME: GCC also intends to return 1 for literals of aggregate types, but | ||||||
9825 | // its support for this did not work prior to GCC 9 and is not yet well | ||||||
9826 | // understood. | ||||||
9827 | if (ArgType->isIntegralOrEnumerationType() || ArgType->isFloatingType() || | ||||||
9828 | ArgType->isAnyComplexType() || ArgType->isPointerType() || | ||||||
9829 | ArgType->isNullPtrType()) { | ||||||
9830 | APValue V; | ||||||
9831 | if (!::EvaluateAsRValue(Info, Arg, V)) { | ||||||
9832 | Fold.keepDiagnostics(); | ||||||
9833 | return false; | ||||||
9834 | } | ||||||
9835 | |||||||
9836 | // For a pointer (possibly cast to integer), there are special rules. | ||||||
9837 | if (V.getKind() == APValue::LValue) | ||||||
9838 | return EvaluateBuiltinConstantPForLValue(V); | ||||||
9839 | |||||||
9840 | // Otherwise, any constant value is good enough. | ||||||
9841 | return V.hasValue(); | ||||||
9842 | } | ||||||
9843 | |||||||
9844 | // Anything else isn't considered to be sufficiently constant. | ||||||
9845 | return false; | ||||||
9846 | } | ||||||
9847 | |||||||
9848 | /// Retrieves the "underlying object type" of the given expression, | ||||||
9849 | /// as used by __builtin_object_size. | ||||||
9850 | static QualType getObjectType(APValue::LValueBase B) { | ||||||
9851 | if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { | ||||||
9852 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) | ||||||
9853 | return VD->getType(); | ||||||
9854 | } else if (const Expr *E = B.get<const Expr*>()) { | ||||||
9855 | if (isa<CompoundLiteralExpr>(E)) | ||||||
9856 | return E->getType(); | ||||||
9857 | } else if (B.is<TypeInfoLValue>()) { | ||||||
9858 | return B.getTypeInfoType(); | ||||||
9859 | } else if (B.is<DynamicAllocLValue>()) { | ||||||
9860 | return B.getDynamicAllocType(); | ||||||
9861 | } | ||||||
9862 | |||||||
9863 | return QualType(); | ||||||
9864 | } | ||||||
9865 | |||||||
9866 | /// A more selective version of E->IgnoreParenCasts for | ||||||
9867 | /// tryEvaluateBuiltinObjectSize. This ignores some casts/parens that serve only | ||||||
9868 | /// to change the type of E. | ||||||
9869 | /// Ex. For E = `(short*)((char*)(&foo))`, returns `&foo` | ||||||
9870 | /// | ||||||
9871 | /// Always returns an RValue with a pointer representation. | ||||||
9872 | static const Expr *ignorePointerCastsAndParens(const Expr *E) { | ||||||
9873 | assert(E->isRValue() && E->getType()->hasPointerRepresentation())((E->isRValue() && E->getType()->hasPointerRepresentation ()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->hasPointerRepresentation()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9873, __PRETTY_FUNCTION__)); | ||||||
9874 | |||||||
9875 | auto *NoParens = E->IgnoreParens(); | ||||||
9876 | auto *Cast = dyn_cast<CastExpr>(NoParens); | ||||||
9877 | if (Cast == nullptr) | ||||||
9878 | return NoParens; | ||||||
9879 | |||||||
9880 | // We only conservatively allow a few kinds of casts, because this code is | ||||||
9881 | // inherently a simple solution that seeks to support the common case. | ||||||
9882 | auto CastKind = Cast->getCastKind(); | ||||||
9883 | if (CastKind != CK_NoOp && CastKind != CK_BitCast && | ||||||
9884 | CastKind != CK_AddressSpaceConversion) | ||||||
9885 | return NoParens; | ||||||
9886 | |||||||
9887 | auto *SubExpr = Cast->getSubExpr(); | ||||||
9888 | if (!SubExpr->getType()->hasPointerRepresentation() || !SubExpr->isRValue()) | ||||||
9889 | return NoParens; | ||||||
9890 | return ignorePointerCastsAndParens(SubExpr); | ||||||
9891 | } | ||||||
9892 | |||||||
9893 | /// Checks to see if the given LValue's Designator is at the end of the LValue's | ||||||
9894 | /// record layout. e.g. | ||||||
9895 | /// struct { struct { int a, b; } fst, snd; } obj; | ||||||
9896 | /// obj.fst // no | ||||||
9897 | /// obj.snd // yes | ||||||
9898 | /// obj.fst.a // no | ||||||
9899 | /// obj.fst.b // no | ||||||
9900 | /// obj.snd.a // no | ||||||
9901 | /// obj.snd.b // yes | ||||||
9902 | /// | ||||||
9903 | /// Please note: this function is specialized for how __builtin_object_size | ||||||
9904 | /// views "objects". | ||||||
9905 | /// | ||||||
9906 | /// If this encounters an invalid RecordDecl or otherwise cannot determine the | ||||||
9907 | /// correct result, it will always return true. | ||||||
9908 | static bool isDesignatorAtObjectEnd(const ASTContext &Ctx, const LValue &LVal) { | ||||||
9909 | assert(!LVal.Designator.Invalid)((!LVal.Designator.Invalid) ? static_cast<void> (0) : __assert_fail ("!LVal.Designator.Invalid", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9909, __PRETTY_FUNCTION__)); | ||||||
9910 | |||||||
9911 | auto IsLastOrInvalidFieldDecl = [&Ctx](const FieldDecl *FD, bool &Invalid) { | ||||||
9912 | const RecordDecl *Parent = FD->getParent(); | ||||||
9913 | Invalid = Parent->isInvalidDecl(); | ||||||
9914 | if (Invalid || Parent->isUnion()) | ||||||
9915 | return true; | ||||||
9916 | const ASTRecordLayout &Layout = Ctx.getASTRecordLayout(Parent); | ||||||
9917 | return FD->getFieldIndex() + 1 == Layout.getFieldCount(); | ||||||
9918 | }; | ||||||
9919 | |||||||
9920 | auto &Base = LVal.getLValueBase(); | ||||||
9921 | if (auto *ME = dyn_cast_or_null<MemberExpr>(Base.dyn_cast<const Expr *>())) { | ||||||
9922 | if (auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { | ||||||
9923 | bool Invalid; | ||||||
9924 | if (!IsLastOrInvalidFieldDecl(FD, Invalid)) | ||||||
9925 | return Invalid; | ||||||
9926 | } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(ME->getMemberDecl())) { | ||||||
9927 | for (auto *FD : IFD->chain()) { | ||||||
9928 | bool Invalid; | ||||||
9929 | if (!IsLastOrInvalidFieldDecl(cast<FieldDecl>(FD), Invalid)) | ||||||
9930 | return Invalid; | ||||||
9931 | } | ||||||
9932 | } | ||||||
9933 | } | ||||||
9934 | |||||||
9935 | unsigned I = 0; | ||||||
9936 | QualType BaseType = getType(Base); | ||||||
9937 | if (LVal.Designator.FirstEntryIsAnUnsizedArray) { | ||||||
9938 | // If we don't know the array bound, conservatively assume we're looking at | ||||||
9939 | // the final array element. | ||||||
9940 | ++I; | ||||||
9941 | if (BaseType->isIncompleteArrayType()) | ||||||
9942 | BaseType = Ctx.getAsArrayType(BaseType)->getElementType(); | ||||||
9943 | else | ||||||
9944 | BaseType = BaseType->castAs<PointerType>()->getPointeeType(); | ||||||
9945 | } | ||||||
9946 | |||||||
9947 | for (unsigned E = LVal.Designator.Entries.size(); I != E; ++I) { | ||||||
9948 | const auto &Entry = LVal.Designator.Entries[I]; | ||||||
9949 | if (BaseType->isArrayType()) { | ||||||
9950 | // Because __builtin_object_size treats arrays as objects, we can ignore | ||||||
9951 | // the index iff this is the last array in the Designator. | ||||||
9952 | if (I + 1 == E) | ||||||
9953 | return true; | ||||||
9954 | const auto *CAT = cast<ConstantArrayType>(Ctx.getAsArrayType(BaseType)); | ||||||
9955 | uint64_t Index = Entry.getAsArrayIndex(); | ||||||
9956 | if (Index + 1 != CAT->getSize()) | ||||||
9957 | return false; | ||||||
9958 | BaseType = CAT->getElementType(); | ||||||
9959 | } else if (BaseType->isAnyComplexType()) { | ||||||
9960 | const auto *CT = BaseType->castAs<ComplexType>(); | ||||||
9961 | uint64_t Index = Entry.getAsArrayIndex(); | ||||||
9962 | if (Index != 1) | ||||||
9963 | return false; | ||||||
9964 | BaseType = CT->getElementType(); | ||||||
9965 | } else if (auto *FD = getAsField(Entry)) { | ||||||
9966 | bool Invalid; | ||||||
9967 | if (!IsLastOrInvalidFieldDecl(FD, Invalid)) | ||||||
9968 | return Invalid; | ||||||
9969 | BaseType = FD->getType(); | ||||||
9970 | } else { | ||||||
9971 | assert(getAsBaseClass(Entry) && "Expecting cast to a base class")((getAsBaseClass(Entry) && "Expecting cast to a base class" ) ? static_cast<void> (0) : __assert_fail ("getAsBaseClass(Entry) && \"Expecting cast to a base class\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 9971, __PRETTY_FUNCTION__)); | ||||||
9972 | return false; | ||||||
9973 | } | ||||||
9974 | } | ||||||
9975 | return true; | ||||||
9976 | } | ||||||
9977 | |||||||
9978 | /// Tests to see if the LValue has a user-specified designator (that isn't | ||||||
9979 | /// necessarily valid). Note that this always returns 'true' if the LValue has | ||||||
9980 | /// an unsized array as its first designator entry, because there's currently no | ||||||
9981 | /// way to tell if the user typed *foo or foo[0]. | ||||||
9982 | static bool refersToCompleteObject(const LValue &LVal) { | ||||||
9983 | if (LVal.Designator.Invalid) | ||||||
9984 | return false; | ||||||
9985 | |||||||
9986 | if (!LVal.Designator.Entries.empty()) | ||||||
9987 | return LVal.Designator.isMostDerivedAnUnsizedArray(); | ||||||
9988 | |||||||
9989 | if (!LVal.InvalidBase) | ||||||
9990 | return true; | ||||||
9991 | |||||||
9992 | // If `E` is a MemberExpr, then the first part of the designator is hiding in | ||||||
9993 | // the LValueBase. | ||||||
9994 | const auto *E = LVal.Base.dyn_cast<const Expr *>(); | ||||||
9995 | return !E || !isa<MemberExpr>(E); | ||||||
9996 | } | ||||||
9997 | |||||||
9998 | /// Attempts to detect a user writing into a piece of memory that's impossible | ||||||
9999 | /// to figure out the size of by just using types. | ||||||
10000 | static bool isUserWritingOffTheEnd(const ASTContext &Ctx, const LValue &LVal) { | ||||||
10001 | const SubobjectDesignator &Designator = LVal.Designator; | ||||||
10002 | // Notes: | ||||||
10003 | // - Users can only write off of the end when we have an invalid base. Invalid | ||||||
10004 | // bases imply we don't know where the memory came from. | ||||||
10005 | // - We used to be a bit more aggressive here; we'd only be conservative if | ||||||
10006 | // the array at the end was flexible, or if it had 0 or 1 elements. This | ||||||
10007 | // broke some common standard library extensions (PR30346), but was | ||||||
10008 | // otherwise seemingly fine. It may be useful to reintroduce this behavior | ||||||
10009 | // with some sort of whitelist. OTOH, it seems that GCC is always | ||||||
10010 | // conservative with the last element in structs (if it's an array), so our | ||||||
10011 | // current behavior is more compatible than a whitelisting approach would | ||||||
10012 | // be. | ||||||
10013 | return LVal.InvalidBase && | ||||||
10014 | Designator.Entries.size() == Designator.MostDerivedPathLength && | ||||||
10015 | Designator.MostDerivedIsArrayElement && | ||||||
10016 | isDesignatorAtObjectEnd(Ctx, LVal); | ||||||
10017 | } | ||||||
10018 | |||||||
10019 | /// Converts the given APInt to CharUnits, assuming the APInt is unsigned. | ||||||
10020 | /// Fails if the conversion would cause loss of precision. | ||||||
10021 | static bool convertUnsignedAPIntToCharUnits(const llvm::APInt &Int, | ||||||
10022 | CharUnits &Result) { | ||||||
10023 | auto CharUnitsMax = std::numeric_limits<CharUnits::QuantityType>::max(); | ||||||
10024 | if (Int.ugt(CharUnitsMax)) | ||||||
10025 | return false; | ||||||
10026 | Result = CharUnits::fromQuantity(Int.getZExtValue()); | ||||||
10027 | return true; | ||||||
10028 | } | ||||||
10029 | |||||||
10030 | /// Helper for tryEvaluateBuiltinObjectSize -- Given an LValue, this will | ||||||
10031 | /// determine how many bytes exist from the beginning of the object to either | ||||||
10032 | /// the end of the current subobject, or the end of the object itself, depending | ||||||
10033 | /// on what the LValue looks like + the value of Type. | ||||||
10034 | /// | ||||||
10035 | /// If this returns false, the value of Result is undefined. | ||||||
10036 | static bool determineEndOffset(EvalInfo &Info, SourceLocation ExprLoc, | ||||||
10037 | unsigned Type, const LValue &LVal, | ||||||
10038 | CharUnits &EndOffset) { | ||||||
10039 | bool DetermineForCompleteObject = refersToCompleteObject(LVal); | ||||||
10040 | |||||||
10041 | auto CheckedHandleSizeof = [&](QualType Ty, CharUnits &Result) { | ||||||
10042 | if (Ty.isNull() || Ty->isIncompleteType() || Ty->isFunctionType()) | ||||||
10043 | return false; | ||||||
10044 | return HandleSizeof(Info, ExprLoc, Ty, Result); | ||||||
10045 | }; | ||||||
10046 | |||||||
10047 | // We want to evaluate the size of the entire object. This is a valid fallback | ||||||
10048 | // for when Type=1 and the designator is invalid, because we're asked for an | ||||||
10049 | // upper-bound. | ||||||
10050 | if (!(Type & 1) || LVal.Designator.Invalid || DetermineForCompleteObject) { | ||||||
10051 | // Type=3 wants a lower bound, so we can't fall back to this. | ||||||
10052 | if (Type == 3 && !DetermineForCompleteObject) | ||||||
10053 | return false; | ||||||
10054 | |||||||
10055 | llvm::APInt APEndOffset; | ||||||
10056 | if (isBaseAnAllocSizeCall(LVal.getLValueBase()) && | ||||||
10057 | getBytesReturnedByAllocSizeCall(Info.Ctx, LVal, APEndOffset)) | ||||||
10058 | return convertUnsignedAPIntToCharUnits(APEndOffset, EndOffset); | ||||||
10059 | |||||||
10060 | if (LVal.InvalidBase) | ||||||
10061 | return false; | ||||||
10062 | |||||||
10063 | QualType BaseTy = getObjectType(LVal.getLValueBase()); | ||||||
10064 | return CheckedHandleSizeof(BaseTy, EndOffset); | ||||||
10065 | } | ||||||
10066 | |||||||
10067 | // We want to evaluate the size of a subobject. | ||||||
10068 | const SubobjectDesignator &Designator = LVal.Designator; | ||||||
10069 | |||||||
10070 | // The following is a moderately common idiom in C: | ||||||
10071 | // | ||||||
10072 | // struct Foo { int a; char c[1]; }; | ||||||
10073 | // struct Foo *F = (struct Foo *)malloc(sizeof(struct Foo) + strlen(Bar)); | ||||||
10074 | // strcpy(&F->c[0], Bar); | ||||||
10075 | // | ||||||
10076 | // In order to not break too much legacy code, we need to support it. | ||||||
10077 | if (isUserWritingOffTheEnd(Info.Ctx, LVal)) { | ||||||
10078 | // If we can resolve this to an alloc_size call, we can hand that back, | ||||||
10079 | // because we know for certain how many bytes there are to write to. | ||||||
10080 | llvm::APInt APEndOffset; | ||||||
10081 | if (isBaseAnAllocSizeCall(LVal.getLValueBase()) && | ||||||
10082 | getBytesReturnedByAllocSizeCall(Info.Ctx, LVal, APEndOffset)) | ||||||
10083 | return convertUnsignedAPIntToCharUnits(APEndOffset, EndOffset); | ||||||
10084 | |||||||
10085 | // If we cannot determine the size of the initial allocation, then we can't | ||||||
10086 | // given an accurate upper-bound. However, we are still able to give | ||||||
10087 | // conservative lower-bounds for Type=3. | ||||||
10088 | if (Type == 1) | ||||||
10089 | return false; | ||||||
10090 | } | ||||||
10091 | |||||||
10092 | CharUnits BytesPerElem; | ||||||
10093 | if (!CheckedHandleSizeof(Designator.MostDerivedType, BytesPerElem)) | ||||||
10094 | return false; | ||||||
10095 | |||||||
10096 | // According to the GCC documentation, we want the size of the subobject | ||||||
10097 | // denoted by the pointer. But that's not quite right -- what we actually | ||||||
10098 | // want is the size of the immediately-enclosing array, if there is one. | ||||||
10099 | int64_t ElemsRemaining; | ||||||
10100 | if (Designator.MostDerivedIsArrayElement && | ||||||
10101 | Designator.Entries.size() == Designator.MostDerivedPathLength) { | ||||||
10102 | uint64_t ArraySize = Designator.getMostDerivedArraySize(); | ||||||
10103 | uint64_t ArrayIndex = Designator.Entries.back().getAsArrayIndex(); | ||||||
10104 | ElemsRemaining = ArraySize <= ArrayIndex ? 0 : ArraySize - ArrayIndex; | ||||||
10105 | } else { | ||||||
10106 | ElemsRemaining = Designator.isOnePastTheEnd() ? 0 : 1; | ||||||
10107 | } | ||||||
10108 | |||||||
10109 | EndOffset = LVal.getLValueOffset() + BytesPerElem * ElemsRemaining; | ||||||
10110 | return true; | ||||||
10111 | } | ||||||
10112 | |||||||
10113 | /// Tries to evaluate the __builtin_object_size for @p E. If successful, | ||||||
10114 | /// returns true and stores the result in @p Size. | ||||||
10115 | /// | ||||||
10116 | /// If @p WasError is non-null, this will report whether the failure to evaluate | ||||||
10117 | /// is to be treated as an Error in IntExprEvaluator. | ||||||
10118 | static bool tryEvaluateBuiltinObjectSize(const Expr *E, unsigned Type, | ||||||
10119 | EvalInfo &Info, uint64_t &Size) { | ||||||
10120 | // Determine the denoted object. | ||||||
10121 | LValue LVal; | ||||||
10122 | { | ||||||
10123 | // The operand of __builtin_object_size is never evaluated for side-effects. | ||||||
10124 | // If there are any, but we can determine the pointed-to object anyway, then | ||||||
10125 | // ignore the side-effects. | ||||||
10126 | SpeculativeEvaluationRAII SpeculativeEval(Info); | ||||||
10127 | IgnoreSideEffectsRAII Fold(Info); | ||||||
10128 | |||||||
10129 | if (E->isGLValue()) { | ||||||
10130 | // It's possible for us to be given GLValues if we're called via | ||||||
10131 | // Expr::tryEvaluateObjectSize. | ||||||
10132 | APValue RVal; | ||||||
10133 | if (!EvaluateAsRValue(Info, E, RVal)) | ||||||
10134 | return false; | ||||||
10135 | LVal.setFrom(Info.Ctx, RVal); | ||||||
10136 | } else if (!EvaluatePointer(ignorePointerCastsAndParens(E), LVal, Info, | ||||||
10137 | /*InvalidBaseOK=*/true)) | ||||||
10138 | return false; | ||||||
10139 | } | ||||||
10140 | |||||||
10141 | // If we point to before the start of the object, there are no accessible | ||||||
10142 | // bytes. | ||||||
10143 | if (LVal.getLValueOffset().isNegative()) { | ||||||
10144 | Size = 0; | ||||||
10145 | return true; | ||||||
10146 | } | ||||||
10147 | |||||||
10148 | CharUnits EndOffset; | ||||||
10149 | if (!determineEndOffset(Info, E->getExprLoc(), Type, LVal, EndOffset)) | ||||||
10150 | return false; | ||||||
10151 | |||||||
10152 | // If we've fallen outside of the end offset, just pretend there's nothing to | ||||||
10153 | // write to/read from. | ||||||
10154 | if (EndOffset <= LVal.getLValueOffset()) | ||||||
10155 | Size = 0; | ||||||
10156 | else | ||||||
10157 | Size = (EndOffset - LVal.getLValueOffset()).getQuantity(); | ||||||
10158 | return true; | ||||||
10159 | } | ||||||
10160 | |||||||
10161 | bool IntExprEvaluator::VisitConstantExpr(const ConstantExpr *E) { | ||||||
10162 | llvm::SaveAndRestore<bool> InConstantContext(Info.InConstantContext, true); | ||||||
10163 | if (E->getResultAPValueKind() != APValue::None) | ||||||
10164 | return Success(E->getAPValueResult(), E); | ||||||
10165 | return ExprEvaluatorBaseTy::VisitConstantExpr(E); | ||||||
10166 | } | ||||||
10167 | |||||||
10168 | bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { | ||||||
10169 | if (unsigned BuiltinOp = E->getBuiltinCallee()) | ||||||
10170 | return VisitBuiltinCallExpr(E, BuiltinOp); | ||||||
10171 | |||||||
10172 | return ExprEvaluatorBaseTy::VisitCallExpr(E); | ||||||
10173 | } | ||||||
10174 | |||||||
10175 | bool IntExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E, | ||||||
10176 | unsigned BuiltinOp) { | ||||||
10177 | switch (unsigned BuiltinOp = E->getBuiltinCallee()) { | ||||||
10178 | default: | ||||||
10179 | return ExprEvaluatorBaseTy::VisitCallExpr(E); | ||||||
10180 | |||||||
10181 | case Builtin::BI__builtin_dynamic_object_size: | ||||||
10182 | case Builtin::BI__builtin_object_size: { | ||||||
10183 | // The type was checked when we built the expression. | ||||||
10184 | unsigned Type = | ||||||
10185 | E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); | ||||||
10186 | assert(Type <= 3 && "unexpected type")((Type <= 3 && "unexpected type") ? static_cast< void> (0) : __assert_fail ("Type <= 3 && \"unexpected type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10186, __PRETTY_FUNCTION__)); | ||||||
10187 | |||||||
10188 | uint64_t Size; | ||||||
10189 | if (tryEvaluateBuiltinObjectSize(E->getArg(0), Type, Info, Size)) | ||||||
10190 | return Success(Size, E); | ||||||
10191 | |||||||
10192 | if (E->getArg(0)->HasSideEffects(Info.Ctx)) | ||||||
10193 | return Success((Type & 2) ? 0 : -1, E); | ||||||
10194 | |||||||
10195 | // Expression had no side effects, but we couldn't statically determine the | ||||||
10196 | // size of the referenced object. | ||||||
10197 | switch (Info.EvalMode) { | ||||||
10198 | case EvalInfo::EM_ConstantExpression: | ||||||
10199 | case EvalInfo::EM_ConstantFold: | ||||||
10200 | case EvalInfo::EM_IgnoreSideEffects: | ||||||
10201 | // Leave it to IR generation. | ||||||
10202 | return Error(E); | ||||||
10203 | case EvalInfo::EM_ConstantExpressionUnevaluated: | ||||||
10204 | // Reduce it to a constant now. | ||||||
10205 | return Success((Type & 2) ? 0 : -1, E); | ||||||
10206 | } | ||||||
10207 | |||||||
10208 | llvm_unreachable("unexpected EvalMode")::llvm::llvm_unreachable_internal("unexpected EvalMode", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10208); | ||||||
10209 | } | ||||||
10210 | |||||||
10211 | case Builtin::BI__builtin_os_log_format_buffer_size: { | ||||||
10212 | analyze_os_log::OSLogBufferLayout Layout; | ||||||
10213 | analyze_os_log::computeOSLogBufferLayout(Info.Ctx, E, Layout); | ||||||
10214 | return Success(Layout.size().getQuantity(), E); | ||||||
10215 | } | ||||||
10216 | |||||||
10217 | case Builtin::BI__builtin_bswap16: | ||||||
10218 | case Builtin::BI__builtin_bswap32: | ||||||
10219 | case Builtin::BI__builtin_bswap64: { | ||||||
10220 | APSInt Val; | ||||||
10221 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | ||||||
10222 | return false; | ||||||
10223 | |||||||
10224 | return Success(Val.byteSwap(), E); | ||||||
10225 | } | ||||||
10226 | |||||||
10227 | case Builtin::BI__builtin_classify_type: | ||||||
10228 | return Success((int)EvaluateBuiltinClassifyType(E, Info.getLangOpts()), E); | ||||||
10229 | |||||||
10230 | case Builtin::BI__builtin_clrsb: | ||||||
10231 | case Builtin::BI__builtin_clrsbl: | ||||||
10232 | case Builtin::BI__builtin_clrsbll: { | ||||||
10233 | APSInt Val; | ||||||
10234 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | ||||||
10235 | return false; | ||||||
10236 | |||||||
10237 | return Success(Val.getBitWidth() - Val.getMinSignedBits(), E); | ||||||
10238 | } | ||||||
10239 | |||||||
10240 | case Builtin::BI__builtin_clz: | ||||||
10241 | case Builtin::BI__builtin_clzl: | ||||||
10242 | case Builtin::BI__builtin_clzll: | ||||||
10243 | case Builtin::BI__builtin_clzs: { | ||||||
10244 | APSInt Val; | ||||||
10245 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | ||||||
10246 | return false; | ||||||
10247 | if (!Val) | ||||||
10248 | return Error(E); | ||||||
10249 | |||||||
10250 | return Success(Val.countLeadingZeros(), E); | ||||||
10251 | } | ||||||
10252 | |||||||
10253 | case Builtin::BI__builtin_constant_p: { | ||||||
10254 | const Expr *Arg = E->getArg(0); | ||||||
10255 | if (EvaluateBuiltinConstantP(Info, Arg)) | ||||||
10256 | return Success(true, E); | ||||||
10257 | if (Info.InConstantContext || Arg->HasSideEffects(Info.Ctx)) { | ||||||
10258 | // Outside a constant context, eagerly evaluate to false in the presence | ||||||
10259 | // of side-effects in order to avoid -Wunsequenced false-positives in | ||||||
10260 | // a branch on __builtin_constant_p(expr). | ||||||
10261 | return Success(false, E); | ||||||
10262 | } | ||||||
10263 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
10264 | return false; | ||||||
10265 | } | ||||||
10266 | |||||||
10267 | case Builtin::BI__builtin_is_constant_evaluated: | ||||||
10268 | return Success(Info.InConstantContext, E); | ||||||
10269 | |||||||
10270 | case Builtin::BI__builtin_ctz: | ||||||
10271 | case Builtin::BI__builtin_ctzl: | ||||||
10272 | case Builtin::BI__builtin_ctzll: | ||||||
10273 | case Builtin::BI__builtin_ctzs: { | ||||||
10274 | APSInt Val; | ||||||
10275 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | ||||||
10276 | return false; | ||||||
10277 | if (!Val) | ||||||
10278 | return Error(E); | ||||||
10279 | |||||||
10280 | return Success(Val.countTrailingZeros(), E); | ||||||
10281 | } | ||||||
10282 | |||||||
10283 | case Builtin::BI__builtin_eh_return_data_regno: { | ||||||
10284 | int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); | ||||||
10285 | Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); | ||||||
10286 | return Success(Operand, E); | ||||||
10287 | } | ||||||
10288 | |||||||
10289 | case Builtin::BI__builtin_expect: | ||||||
10290 | return Visit(E->getArg(0)); | ||||||
10291 | |||||||
10292 | case Builtin::BI__builtin_ffs: | ||||||
10293 | case Builtin::BI__builtin_ffsl: | ||||||
10294 | case Builtin::BI__builtin_ffsll: { | ||||||
10295 | APSInt Val; | ||||||
10296 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | ||||||
10297 | return false; | ||||||
10298 | |||||||
10299 | unsigned N = Val.countTrailingZeros(); | ||||||
10300 | return Success(N == Val.getBitWidth() ? 0 : N + 1, E); | ||||||
10301 | } | ||||||
10302 | |||||||
10303 | case Builtin::BI__builtin_fpclassify: { | ||||||
10304 | APFloat Val(0.0); | ||||||
10305 | if (!EvaluateFloat(E->getArg(5), Val, Info)) | ||||||
10306 | return false; | ||||||
10307 | unsigned Arg; | ||||||
10308 | switch (Val.getCategory()) { | ||||||
10309 | case APFloat::fcNaN: Arg = 0; break; | ||||||
10310 | case APFloat::fcInfinity: Arg = 1; break; | ||||||
10311 | case APFloat::fcNormal: Arg = Val.isDenormal() ? 3 : 2; break; | ||||||
10312 | case APFloat::fcZero: Arg = 4; break; | ||||||
10313 | } | ||||||
10314 | return Visit(E->getArg(Arg)); | ||||||
10315 | } | ||||||
10316 | |||||||
10317 | case Builtin::BI__builtin_isinf_sign: { | ||||||
10318 | APFloat Val(0.0); | ||||||
10319 | return EvaluateFloat(E->getArg(0), Val, Info) && | ||||||
10320 | Success(Val.isInfinity() ? (Val.isNegative() ? -1 : 1) : 0, E); | ||||||
10321 | } | ||||||
10322 | |||||||
10323 | case Builtin::BI__builtin_isinf: { | ||||||
10324 | APFloat Val(0.0); | ||||||
10325 | return EvaluateFloat(E->getArg(0), Val, Info) && | ||||||
10326 | Success(Val.isInfinity() ? 1 : 0, E); | ||||||
10327 | } | ||||||
10328 | |||||||
10329 | case Builtin::BI__builtin_isfinite: { | ||||||
10330 | APFloat Val(0.0); | ||||||
10331 | return EvaluateFloat(E->getArg(0), Val, Info) && | ||||||
10332 | Success(Val.isFinite() ? 1 : 0, E); | ||||||
10333 | } | ||||||
10334 | |||||||
10335 | case Builtin::BI__builtin_isnan: { | ||||||
10336 | APFloat Val(0.0); | ||||||
10337 | return EvaluateFloat(E->getArg(0), Val, Info) && | ||||||
10338 | Success(Val.isNaN() ? 1 : 0, E); | ||||||
10339 | } | ||||||
10340 | |||||||
10341 | case Builtin::BI__builtin_isnormal: { | ||||||
10342 | APFloat Val(0.0); | ||||||
10343 | return EvaluateFloat(E->getArg(0), Val, Info) && | ||||||
10344 | Success(Val.isNormal() ? 1 : 0, E); | ||||||
10345 | } | ||||||
10346 | |||||||
10347 | case Builtin::BI__builtin_parity: | ||||||
10348 | case Builtin::BI__builtin_parityl: | ||||||
10349 | case Builtin::BI__builtin_parityll: { | ||||||
10350 | APSInt Val; | ||||||
10351 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | ||||||
10352 | return false; | ||||||
10353 | |||||||
10354 | return Success(Val.countPopulation() % 2, E); | ||||||
10355 | } | ||||||
10356 | |||||||
10357 | case Builtin::BI__builtin_popcount: | ||||||
10358 | case Builtin::BI__builtin_popcountl: | ||||||
10359 | case Builtin::BI__builtin_popcountll: { | ||||||
10360 | APSInt Val; | ||||||
10361 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | ||||||
10362 | return false; | ||||||
10363 | |||||||
10364 | return Success(Val.countPopulation(), E); | ||||||
10365 | } | ||||||
10366 | |||||||
10367 | case Builtin::BIstrlen: | ||||||
10368 | case Builtin::BIwcslen: | ||||||
10369 | // A call to strlen is not a constant expression. | ||||||
10370 | if (Info.getLangOpts().CPlusPlus11) | ||||||
10371 | Info.CCEDiag(E, diag::note_constexpr_invalid_function) | ||||||
10372 | << /*isConstexpr*/0 << /*isConstructor*/0 | ||||||
10373 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'"); | ||||||
10374 | else | ||||||
10375 | Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
10376 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||||
10377 | case Builtin::BI__builtin_strlen: | ||||||
10378 | case Builtin::BI__builtin_wcslen: { | ||||||
10379 | // As an extension, we support __builtin_strlen() as a constant expression, | ||||||
10380 | // and support folding strlen() to a constant. | ||||||
10381 | LValue String; | ||||||
10382 | if (!EvaluatePointer(E->getArg(0), String, Info)) | ||||||
10383 | return false; | ||||||
10384 | |||||||
10385 | QualType CharTy = E->getArg(0)->getType()->getPointeeType(); | ||||||
10386 | |||||||
10387 | // Fast path: if it's a string literal, search the string value. | ||||||
10388 | if (const StringLiteral *S = dyn_cast_or_null<StringLiteral>( | ||||||
10389 | String.getLValueBase().dyn_cast<const Expr *>())) { | ||||||
10390 | // The string literal may have embedded null characters. Find the first | ||||||
10391 | // one and truncate there. | ||||||
10392 | StringRef Str = S->getBytes(); | ||||||
10393 | int64_t Off = String.Offset.getQuantity(); | ||||||
10394 | if (Off >= 0 && (uint64_t)Off <= (uint64_t)Str.size() && | ||||||
10395 | S->getCharByteWidth() == 1 && | ||||||
10396 | // FIXME: Add fast-path for wchar_t too. | ||||||
10397 | Info.Ctx.hasSameUnqualifiedType(CharTy, Info.Ctx.CharTy)) { | ||||||
10398 | Str = Str.substr(Off); | ||||||
10399 | |||||||
10400 | StringRef::size_type Pos = Str.find(0); | ||||||
10401 | if (Pos != StringRef::npos) | ||||||
10402 | Str = Str.substr(0, Pos); | ||||||
10403 | |||||||
10404 | return Success(Str.size(), E); | ||||||
10405 | } | ||||||
10406 | |||||||
10407 | // Fall through to slow path to issue appropriate diagnostic. | ||||||
10408 | } | ||||||
10409 | |||||||
10410 | // Slow path: scan the bytes of the string looking for the terminating 0. | ||||||
10411 | for (uint64_t Strlen = 0; /**/; ++Strlen) { | ||||||
10412 | APValue Char; | ||||||
10413 | if (!handleLValueToRValueConversion(Info, E, CharTy, String, Char) || | ||||||
10414 | !Char.isInt()) | ||||||
10415 | return false; | ||||||
10416 | if (!Char.getInt()) | ||||||
10417 | return Success(Strlen, E); | ||||||
10418 | if (!HandleLValueArrayAdjustment(Info, E, String, CharTy, 1)) | ||||||
10419 | return false; | ||||||
10420 | } | ||||||
10421 | } | ||||||
10422 | |||||||
10423 | case Builtin::BIstrcmp: | ||||||
10424 | case Builtin::BIwcscmp: | ||||||
10425 | case Builtin::BIstrncmp: | ||||||
10426 | case Builtin::BIwcsncmp: | ||||||
10427 | case Builtin::BImemcmp: | ||||||
10428 | case Builtin::BIbcmp: | ||||||
10429 | case Builtin::BIwmemcmp: | ||||||
10430 | // A call to strlen is not a constant expression. | ||||||
10431 | if (Info.getLangOpts().CPlusPlus11) | ||||||
10432 | Info.CCEDiag(E, diag::note_constexpr_invalid_function) | ||||||
10433 | << /*isConstexpr*/0 << /*isConstructor*/0 | ||||||
10434 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'"); | ||||||
10435 | else | ||||||
10436 | Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
10437 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||||
10438 | case Builtin::BI__builtin_strcmp: | ||||||
10439 | case Builtin::BI__builtin_wcscmp: | ||||||
10440 | case Builtin::BI__builtin_strncmp: | ||||||
10441 | case Builtin::BI__builtin_wcsncmp: | ||||||
10442 | case Builtin::BI__builtin_memcmp: | ||||||
10443 | case Builtin::BI__builtin_bcmp: | ||||||
10444 | case Builtin::BI__builtin_wmemcmp: { | ||||||
10445 | LValue String1, String2; | ||||||
10446 | if (!EvaluatePointer(E->getArg(0), String1, Info) || | ||||||
10447 | !EvaluatePointer(E->getArg(1), String2, Info)) | ||||||
10448 | return false; | ||||||
10449 | |||||||
10450 | uint64_t MaxLength = uint64_t(-1); | ||||||
10451 | if (BuiltinOp != Builtin::BIstrcmp && | ||||||
10452 | BuiltinOp != Builtin::BIwcscmp && | ||||||
10453 | BuiltinOp != Builtin::BI__builtin_strcmp && | ||||||
10454 | BuiltinOp != Builtin::BI__builtin_wcscmp) { | ||||||
10455 | APSInt N; | ||||||
10456 | if (!EvaluateInteger(E->getArg(2), N, Info)) | ||||||
10457 | return false; | ||||||
10458 | MaxLength = N.getExtValue(); | ||||||
10459 | } | ||||||
10460 | |||||||
10461 | // Empty substrings compare equal by definition. | ||||||
10462 | if (MaxLength == 0u) | ||||||
10463 | return Success(0, E); | ||||||
10464 | |||||||
10465 | if (!String1.checkNullPointerForFoldAccess(Info, E, AK_Read) || | ||||||
10466 | !String2.checkNullPointerForFoldAccess(Info, E, AK_Read) || | ||||||
10467 | String1.Designator.Invalid || String2.Designator.Invalid) | ||||||
10468 | return false; | ||||||
10469 | |||||||
10470 | QualType CharTy1 = String1.Designator.getType(Info.Ctx); | ||||||
10471 | QualType CharTy2 = String2.Designator.getType(Info.Ctx); | ||||||
10472 | |||||||
10473 | bool IsRawByte = BuiltinOp == Builtin::BImemcmp || | ||||||
10474 | BuiltinOp == Builtin::BIbcmp || | ||||||
10475 | BuiltinOp == Builtin::BI__builtin_memcmp || | ||||||
10476 | BuiltinOp == Builtin::BI__builtin_bcmp; | ||||||
10477 | |||||||
10478 | assert(IsRawByte ||((IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E-> getArg(0)->getType()->getPointeeType()) && Info .Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))) ? static_cast <void> (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10481, __PRETTY_FUNCTION__)) | ||||||
10479 | (Info.Ctx.hasSameUnqualifiedType(((IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E-> getArg(0)->getType()->getPointeeType()) && Info .Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))) ? static_cast <void> (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10481, __PRETTY_FUNCTION__)) | ||||||
10480 | CharTy1, E->getArg(0)->getType()->getPointeeType()) &&((IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E-> getArg(0)->getType()->getPointeeType()) && Info .Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))) ? static_cast <void> (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10481, __PRETTY_FUNCTION__)) | ||||||
10481 | Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2)))((IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E-> getArg(0)->getType()->getPointeeType()) && Info .Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))) ? static_cast <void> (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10481, __PRETTY_FUNCTION__)); | ||||||
10482 | |||||||
10483 | const auto &ReadCurElems = [&](APValue &Char1, APValue &Char2) { | ||||||
10484 | return handleLValueToRValueConversion(Info, E, CharTy1, String1, Char1) && | ||||||
10485 | handleLValueToRValueConversion(Info, E, CharTy2, String2, Char2) && | ||||||
10486 | Char1.isInt() && Char2.isInt(); | ||||||
10487 | }; | ||||||
10488 | const auto &AdvanceElems = [&] { | ||||||
10489 | return HandleLValueArrayAdjustment(Info, E, String1, CharTy1, 1) && | ||||||
10490 | HandleLValueArrayAdjustment(Info, E, String2, CharTy2, 1); | ||||||
10491 | }; | ||||||
10492 | |||||||
10493 | if (IsRawByte) { | ||||||
10494 | uint64_t BytesRemaining = MaxLength; | ||||||
10495 | // Pointers to const void may point to objects of incomplete type. | ||||||
10496 | if (CharTy1->isIncompleteType()) { | ||||||
10497 | Info.FFDiag(E, diag::note_constexpr_ltor_incomplete_type) << CharTy1; | ||||||
10498 | return false; | ||||||
10499 | } | ||||||
10500 | if (CharTy2->isIncompleteType()) { | ||||||
10501 | Info.FFDiag(E, diag::note_constexpr_ltor_incomplete_type) << CharTy2; | ||||||
10502 | return false; | ||||||
10503 | } | ||||||
10504 | uint64_t CharTy1Width{Info.Ctx.getTypeSize(CharTy1)}; | ||||||
10505 | CharUnits CharTy1Size = Info.Ctx.toCharUnitsFromBits(CharTy1Width); | ||||||
10506 | // Give up on comparing between elements with disparate widths. | ||||||
10507 | if (CharTy1Size != Info.Ctx.getTypeSizeInChars(CharTy2)) | ||||||
10508 | return false; | ||||||
10509 | uint64_t BytesPerElement = CharTy1Size.getQuantity(); | ||||||
10510 | assert(BytesRemaining && "BytesRemaining should not be zero: the "((BytesRemaining && "BytesRemaining should not be zero: the " "following loop considers at least one element") ? static_cast <void> (0) : __assert_fail ("BytesRemaining && \"BytesRemaining should not be zero: the \" \"following loop considers at least one element\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10511, __PRETTY_FUNCTION__)) | ||||||
10511 | "following loop considers at least one element")((BytesRemaining && "BytesRemaining should not be zero: the " "following loop considers at least one element") ? static_cast <void> (0) : __assert_fail ("BytesRemaining && \"BytesRemaining should not be zero: the \" \"following loop considers at least one element\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10511, __PRETTY_FUNCTION__)); | ||||||
10512 | while (true) { | ||||||
10513 | APValue Char1, Char2; | ||||||
10514 | if (!ReadCurElems(Char1, Char2)) | ||||||
10515 | return false; | ||||||
10516 | // We have compatible in-memory widths, but a possible type and | ||||||
10517 | // (for `bool`) internal representation mismatch. | ||||||
10518 | // Assuming two's complement representation, including 0 for `false` and | ||||||
10519 | // 1 for `true`, we can check an appropriate number of elements for | ||||||
10520 | // equality even if they are not byte-sized. | ||||||
10521 | APSInt Char1InMem = Char1.getInt().extOrTrunc(CharTy1Width); | ||||||
10522 | APSInt Char2InMem = Char2.getInt().extOrTrunc(CharTy1Width); | ||||||
10523 | if (Char1InMem.ne(Char2InMem)) { | ||||||
10524 | // If the elements are byte-sized, then we can produce a three-way | ||||||
10525 | // comparison result in a straightforward manner. | ||||||
10526 | if (BytesPerElement == 1u) { | ||||||
10527 | // memcmp always compares unsigned chars. | ||||||
10528 | return Success(Char1InMem.ult(Char2InMem) ? -1 : 1, E); | ||||||
10529 | } | ||||||
10530 | // The result is byte-order sensitive, and we have multibyte elements. | ||||||
10531 | // FIXME: We can compare the remaining bytes in the correct order. | ||||||
10532 | return false; | ||||||
10533 | } | ||||||
10534 | if (!AdvanceElems()) | ||||||
10535 | return false; | ||||||
10536 | if (BytesRemaining <= BytesPerElement) | ||||||
10537 | break; | ||||||
10538 | BytesRemaining -= BytesPerElement; | ||||||
10539 | } | ||||||
10540 | // Enough elements are equal to account for the memcmp limit. | ||||||
10541 | return Success(0, E); | ||||||
10542 | } | ||||||
10543 | |||||||
10544 | bool StopAtNull = | ||||||
10545 | (BuiltinOp != Builtin::BImemcmp && BuiltinOp != Builtin::BIbcmp && | ||||||
10546 | BuiltinOp != Builtin::BIwmemcmp && | ||||||
10547 | BuiltinOp != Builtin::BI__builtin_memcmp && | ||||||
10548 | BuiltinOp != Builtin::BI__builtin_bcmp && | ||||||
10549 | BuiltinOp != Builtin::BI__builtin_wmemcmp); | ||||||
10550 | bool IsWide = BuiltinOp == Builtin::BIwcscmp || | ||||||
10551 | BuiltinOp == Builtin::BIwcsncmp || | ||||||
10552 | BuiltinOp == Builtin::BIwmemcmp || | ||||||
10553 | BuiltinOp == Builtin::BI__builtin_wcscmp || | ||||||
10554 | BuiltinOp == Builtin::BI__builtin_wcsncmp || | ||||||
10555 | BuiltinOp == Builtin::BI__builtin_wmemcmp; | ||||||
10556 | |||||||
10557 | for (; MaxLength; --MaxLength) { | ||||||
10558 | APValue Char1, Char2; | ||||||
10559 | if (!ReadCurElems(Char1, Char2)) | ||||||
10560 | return false; | ||||||
10561 | if (Char1.getInt() != Char2.getInt()) { | ||||||
10562 | if (IsWide) // wmemcmp compares with wchar_t signedness. | ||||||
10563 | return Success(Char1.getInt() < Char2.getInt() ? -1 : 1, E); | ||||||
10564 | // memcmp always compares unsigned chars. | ||||||
10565 | return Success(Char1.getInt().ult(Char2.getInt()) ? -1 : 1, E); | ||||||
10566 | } | ||||||
10567 | if (StopAtNull && !Char1.getInt()) | ||||||
10568 | return Success(0, E); | ||||||
10569 | assert(!(StopAtNull && !Char2.getInt()))((!(StopAtNull && !Char2.getInt())) ? static_cast< void> (0) : __assert_fail ("!(StopAtNull && !Char2.getInt())" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10569, __PRETTY_FUNCTION__)); | ||||||
10570 | if (!AdvanceElems()) | ||||||
10571 | return false; | ||||||
10572 | } | ||||||
10573 | // We hit the strncmp / memcmp limit. | ||||||
10574 | return Success(0, E); | ||||||
10575 | } | ||||||
10576 | |||||||
10577 | case Builtin::BI__atomic_always_lock_free: | ||||||
10578 | case Builtin::BI__atomic_is_lock_free: | ||||||
10579 | case Builtin::BI__c11_atomic_is_lock_free: { | ||||||
10580 | APSInt SizeVal; | ||||||
10581 | if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) | ||||||
10582 | return false; | ||||||
10583 | |||||||
10584 | // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power | ||||||
10585 | // of two less than the maximum inline atomic width, we know it is | ||||||
10586 | // lock-free. If the size isn't a power of two, or greater than the | ||||||
10587 | // maximum alignment where we promote atomics, we know it is not lock-free | ||||||
10588 | // (at least not in the sense of atomic_is_lock_free). Otherwise, | ||||||
10589 | // the answer can only be determined at runtime; for example, 16-byte | ||||||
10590 | // atomics have lock-free implementations on some, but not all, | ||||||
10591 | // x86-64 processors. | ||||||
10592 | |||||||
10593 | // Check power-of-two. | ||||||
10594 | CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); | ||||||
10595 | if (Size.isPowerOfTwo()) { | ||||||
10596 | // Check against inlining width. | ||||||
10597 | unsigned InlineWidthBits = | ||||||
10598 | Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); | ||||||
10599 | if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) { | ||||||
10600 | if (BuiltinOp == Builtin::BI__c11_atomic_is_lock_free || | ||||||
10601 | Size == CharUnits::One() || | ||||||
10602 | E->getArg(1)->isNullPointerConstant(Info.Ctx, | ||||||
10603 | Expr::NPC_NeverValueDependent)) | ||||||
10604 | // OK, we will inline appropriately-aligned operations of this size, | ||||||
10605 | // and _Atomic(T) is appropriately-aligned. | ||||||
10606 | return Success(1, E); | ||||||
10607 | |||||||
10608 | QualType PointeeType = E->getArg(1)->IgnoreImpCasts()->getType()-> | ||||||
10609 | castAs<PointerType>()->getPointeeType(); | ||||||
10610 | if (!PointeeType->isIncompleteType() && | ||||||
10611 | Info.Ctx.getTypeAlignInChars(PointeeType) >= Size) { | ||||||
10612 | // OK, we will inline operations on this object. | ||||||
10613 | return Success(1, E); | ||||||
10614 | } | ||||||
10615 | } | ||||||
10616 | } | ||||||
10617 | |||||||
10618 | return BuiltinOp == Builtin::BI__atomic_always_lock_free ? | ||||||
10619 | Success(0, E) : Error(E); | ||||||
10620 | } | ||||||
10621 | case Builtin::BIomp_is_initial_device: | ||||||
10622 | // We can decide statically which value the runtime would return if called. | ||||||
10623 | return Success(Info.getLangOpts().OpenMPIsDevice ? 0 : 1, E); | ||||||
10624 | case Builtin::BI__builtin_add_overflow: | ||||||
10625 | case Builtin::BI__builtin_sub_overflow: | ||||||
10626 | case Builtin::BI__builtin_mul_overflow: | ||||||
10627 | case Builtin::BI__builtin_sadd_overflow: | ||||||
10628 | case Builtin::BI__builtin_uadd_overflow: | ||||||
10629 | case Builtin::BI__builtin_uaddl_overflow: | ||||||
10630 | case Builtin::BI__builtin_uaddll_overflow: | ||||||
10631 | case Builtin::BI__builtin_usub_overflow: | ||||||
10632 | case Builtin::BI__builtin_usubl_overflow: | ||||||
10633 | case Builtin::BI__builtin_usubll_overflow: | ||||||
10634 | case Builtin::BI__builtin_umul_overflow: | ||||||
10635 | case Builtin::BI__builtin_umull_overflow: | ||||||
10636 | case Builtin::BI__builtin_umulll_overflow: | ||||||
10637 | case Builtin::BI__builtin_saddl_overflow: | ||||||
10638 | case Builtin::BI__builtin_saddll_overflow: | ||||||
10639 | case Builtin::BI__builtin_ssub_overflow: | ||||||
10640 | case Builtin::BI__builtin_ssubl_overflow: | ||||||
10641 | case Builtin::BI__builtin_ssubll_overflow: | ||||||
10642 | case Builtin::BI__builtin_smul_overflow: | ||||||
10643 | case Builtin::BI__builtin_smull_overflow: | ||||||
10644 | case Builtin::BI__builtin_smulll_overflow: { | ||||||
10645 | LValue ResultLValue; | ||||||
10646 | APSInt LHS, RHS; | ||||||
10647 | |||||||
10648 | QualType ResultType = E->getArg(2)->getType()->getPointeeType(); | ||||||
10649 | if (!EvaluateInteger(E->getArg(0), LHS, Info) || | ||||||
10650 | !EvaluateInteger(E->getArg(1), RHS, Info) || | ||||||
10651 | !EvaluatePointer(E->getArg(2), ResultLValue, Info)) | ||||||
10652 | return false; | ||||||
10653 | |||||||
10654 | APSInt Result; | ||||||
10655 | bool DidOverflow = false; | ||||||
10656 | |||||||
10657 | // If the types don't have to match, enlarge all 3 to the largest of them. | ||||||
10658 | if (BuiltinOp == Builtin::BI__builtin_add_overflow || | ||||||
10659 | BuiltinOp == Builtin::BI__builtin_sub_overflow || | ||||||
10660 | BuiltinOp == Builtin::BI__builtin_mul_overflow) { | ||||||
10661 | bool IsSigned = LHS.isSigned() || RHS.isSigned() || | ||||||
10662 | ResultType->isSignedIntegerOrEnumerationType(); | ||||||
10663 | bool AllSigned = LHS.isSigned() && RHS.isSigned() && | ||||||
10664 | ResultType->isSignedIntegerOrEnumerationType(); | ||||||
10665 | uint64_t LHSSize = LHS.getBitWidth(); | ||||||
10666 | uint64_t RHSSize = RHS.getBitWidth(); | ||||||
10667 | uint64_t ResultSize = Info.Ctx.getTypeSize(ResultType); | ||||||
10668 | uint64_t MaxBits = std::max(std::max(LHSSize, RHSSize), ResultSize); | ||||||
10669 | |||||||
10670 | // Add an additional bit if the signedness isn't uniformly agreed to. We | ||||||
10671 | // could do this ONLY if there is a signed and an unsigned that both have | ||||||
10672 | // MaxBits, but the code to check that is pretty nasty. The issue will be | ||||||
10673 | // caught in the shrink-to-result later anyway. | ||||||
10674 | if (IsSigned && !AllSigned) | ||||||
10675 | ++MaxBits; | ||||||
10676 | |||||||
10677 | LHS = APSInt(LHS.extOrTrunc(MaxBits), !IsSigned); | ||||||
10678 | RHS = APSInt(RHS.extOrTrunc(MaxBits), !IsSigned); | ||||||
10679 | Result = APSInt(MaxBits, !IsSigned); | ||||||
10680 | } | ||||||
10681 | |||||||
10682 | // Find largest int. | ||||||
10683 | switch (BuiltinOp) { | ||||||
10684 | default: | ||||||
10685 | llvm_unreachable("Invalid value for BuiltinOp")::llvm::llvm_unreachable_internal("Invalid value for BuiltinOp" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10685); | ||||||
10686 | case Builtin::BI__builtin_add_overflow: | ||||||
10687 | case Builtin::BI__builtin_sadd_overflow: | ||||||
10688 | case Builtin::BI__builtin_saddl_overflow: | ||||||
10689 | case Builtin::BI__builtin_saddll_overflow: | ||||||
10690 | case Builtin::BI__builtin_uadd_overflow: | ||||||
10691 | case Builtin::BI__builtin_uaddl_overflow: | ||||||
10692 | case Builtin::BI__builtin_uaddll_overflow: | ||||||
10693 | Result = LHS.isSigned() ? LHS.sadd_ov(RHS, DidOverflow) | ||||||
10694 | : LHS.uadd_ov(RHS, DidOverflow); | ||||||
10695 | break; | ||||||
10696 | case Builtin::BI__builtin_sub_overflow: | ||||||
10697 | case Builtin::BI__builtin_ssub_overflow: | ||||||
10698 | case Builtin::BI__builtin_ssubl_overflow: | ||||||
10699 | case Builtin::BI__builtin_ssubll_overflow: | ||||||
10700 | case Builtin::BI__builtin_usub_overflow: | ||||||
10701 | case Builtin::BI__builtin_usubl_overflow: | ||||||
10702 | case Builtin::BI__builtin_usubll_overflow: | ||||||
10703 | Result = LHS.isSigned() ? LHS.ssub_ov(RHS, DidOverflow) | ||||||
10704 | : LHS.usub_ov(RHS, DidOverflow); | ||||||
10705 | break; | ||||||
10706 | case Builtin::BI__builtin_mul_overflow: | ||||||
10707 | case Builtin::BI__builtin_smul_overflow: | ||||||
10708 | case Builtin::BI__builtin_smull_overflow: | ||||||
10709 | case Builtin::BI__builtin_smulll_overflow: | ||||||
10710 | case Builtin::BI__builtin_umul_overflow: | ||||||
10711 | case Builtin::BI__builtin_umull_overflow: | ||||||
10712 | case Builtin::BI__builtin_umulll_overflow: | ||||||
10713 | Result = LHS.isSigned() ? LHS.smul_ov(RHS, DidOverflow) | ||||||
10714 | : LHS.umul_ov(RHS, DidOverflow); | ||||||
10715 | break; | ||||||
10716 | } | ||||||
10717 | |||||||
10718 | // In the case where multiple sizes are allowed, truncate and see if | ||||||
10719 | // the values are the same. | ||||||
10720 | if (BuiltinOp == Builtin::BI__builtin_add_overflow || | ||||||
10721 | BuiltinOp == Builtin::BI__builtin_sub_overflow || | ||||||
10722 | BuiltinOp == Builtin::BI__builtin_mul_overflow) { | ||||||
10723 | // APSInt doesn't have a TruncOrSelf, so we use extOrTrunc instead, | ||||||
10724 | // since it will give us the behavior of a TruncOrSelf in the case where | ||||||
10725 | // its parameter <= its size. We previously set Result to be at least the | ||||||
10726 | // type-size of the result, so getTypeSize(ResultType) <= Result.BitWidth | ||||||
10727 | // will work exactly like TruncOrSelf. | ||||||
10728 | APSInt Temp = Result.extOrTrunc(Info.Ctx.getTypeSize(ResultType)); | ||||||
10729 | Temp.setIsSigned(ResultType->isSignedIntegerOrEnumerationType()); | ||||||
10730 | |||||||
10731 | if (!APSInt::isSameValue(Temp, Result)) | ||||||
10732 | DidOverflow = true; | ||||||
10733 | Result = Temp; | ||||||
10734 | } | ||||||
10735 | |||||||
10736 | APValue APV{Result}; | ||||||
10737 | if (!handleAssignment(Info, E, ResultLValue, ResultType, APV)) | ||||||
10738 | return false; | ||||||
10739 | return Success(DidOverflow, E); | ||||||
10740 | } | ||||||
10741 | } | ||||||
10742 | } | ||||||
10743 | |||||||
10744 | /// Determine whether this is a pointer past the end of the complete | ||||||
10745 | /// object referred to by the lvalue. | ||||||
10746 | static bool isOnePastTheEndOfCompleteObject(const ASTContext &Ctx, | ||||||
10747 | const LValue &LV) { | ||||||
10748 | // A null pointer can be viewed as being "past the end" but we don't | ||||||
10749 | // choose to look at it that way here. | ||||||
10750 | if (!LV.getLValueBase()) | ||||||
10751 | return false; | ||||||
10752 | |||||||
10753 | // If the designator is valid and refers to a subobject, we're not pointing | ||||||
10754 | // past the end. | ||||||
10755 | if (!LV.getLValueDesignator().Invalid && | ||||||
10756 | !LV.getLValueDesignator().isOnePastTheEnd()) | ||||||
10757 | return false; | ||||||
10758 | |||||||
10759 | // A pointer to an incomplete type might be past-the-end if the type's size is | ||||||
10760 | // zero. We cannot tell because the type is incomplete. | ||||||
10761 | QualType Ty = getType(LV.getLValueBase()); | ||||||
10762 | if (Ty->isIncompleteType()) | ||||||
10763 | return true; | ||||||
10764 | |||||||
10765 | // We're a past-the-end pointer if we point to the byte after the object, | ||||||
10766 | // no matter what our type or path is. | ||||||
10767 | auto Size = Ctx.getTypeSizeInChars(Ty); | ||||||
10768 | return LV.getLValueOffset() == Size; | ||||||
10769 | } | ||||||
10770 | |||||||
10771 | namespace { | ||||||
10772 | |||||||
10773 | /// Data recursive integer evaluator of certain binary operators. | ||||||
10774 | /// | ||||||
10775 | /// We use a data recursive algorithm for binary operators so that we are able | ||||||
10776 | /// to handle extreme cases of chained binary operators without causing stack | ||||||
10777 | /// overflow. | ||||||
10778 | class DataRecursiveIntBinOpEvaluator { | ||||||
10779 | struct EvalResult { | ||||||
10780 | APValue Val; | ||||||
10781 | bool Failed; | ||||||
10782 | |||||||
10783 | EvalResult() : Failed(false) { } | ||||||
10784 | |||||||
10785 | void swap(EvalResult &RHS) { | ||||||
10786 | Val.swap(RHS.Val); | ||||||
10787 | Failed = RHS.Failed; | ||||||
10788 | RHS.Failed = false; | ||||||
10789 | } | ||||||
10790 | }; | ||||||
10791 | |||||||
10792 | struct Job { | ||||||
10793 | const Expr *E; | ||||||
10794 | EvalResult LHSResult; // meaningful only for binary operator expression. | ||||||
10795 | enum { AnyExprKind, BinOpKind, BinOpVisitedLHSKind } Kind; | ||||||
10796 | |||||||
10797 | Job() = default; | ||||||
10798 | Job(Job &&) = default; | ||||||
10799 | |||||||
10800 | void startSpeculativeEval(EvalInfo &Info) { | ||||||
10801 | SpecEvalRAII = SpeculativeEvaluationRAII(Info); | ||||||
10802 | } | ||||||
10803 | |||||||
10804 | private: | ||||||
10805 | SpeculativeEvaluationRAII SpecEvalRAII; | ||||||
10806 | }; | ||||||
10807 | |||||||
10808 | SmallVector<Job, 16> Queue; | ||||||
10809 | |||||||
10810 | IntExprEvaluator &IntEval; | ||||||
10811 | EvalInfo &Info; | ||||||
10812 | APValue &FinalResult; | ||||||
10813 | |||||||
10814 | public: | ||||||
10815 | DataRecursiveIntBinOpEvaluator(IntExprEvaluator &IntEval, APValue &Result) | ||||||
10816 | : IntEval(IntEval), Info(IntEval.getEvalInfo()), FinalResult(Result) { } | ||||||
10817 | |||||||
10818 | /// True if \param E is a binary operator that we are going to handle | ||||||
10819 | /// data recursively. | ||||||
10820 | /// We handle binary operators that are comma, logical, or that have operands | ||||||
10821 | /// with integral or enumeration type. | ||||||
10822 | static bool shouldEnqueue(const BinaryOperator *E) { | ||||||
10823 | return E->getOpcode() == BO_Comma || E->isLogicalOp() || | ||||||
10824 | (E->isRValue() && E->getType()->isIntegralOrEnumerationType() && | ||||||
10825 | E->getLHS()->getType()->isIntegralOrEnumerationType() && | ||||||
10826 | E->getRHS()->getType()->isIntegralOrEnumerationType()); | ||||||
10827 | } | ||||||
10828 | |||||||
10829 | bool Traverse(const BinaryOperator *E) { | ||||||
10830 | enqueue(E); | ||||||
10831 | EvalResult PrevResult; | ||||||
10832 | while (!Queue.empty()) | ||||||
10833 | process(PrevResult); | ||||||
10834 | |||||||
10835 | if (PrevResult.Failed) return false; | ||||||
10836 | |||||||
10837 | FinalResult.swap(PrevResult.Val); | ||||||
10838 | return true; | ||||||
10839 | } | ||||||
10840 | |||||||
10841 | private: | ||||||
10842 | bool Success(uint64_t Value, const Expr *E, APValue &Result) { | ||||||
10843 | return IntEval.Success(Value, E, Result); | ||||||
10844 | } | ||||||
10845 | bool Success(const APSInt &Value, const Expr *E, APValue &Result) { | ||||||
10846 | return IntEval.Success(Value, E, Result); | ||||||
10847 | } | ||||||
10848 | bool Error(const Expr *E) { | ||||||
10849 | return IntEval.Error(E); | ||||||
10850 | } | ||||||
10851 | bool Error(const Expr *E, diag::kind D) { | ||||||
10852 | return IntEval.Error(E, D); | ||||||
10853 | } | ||||||
10854 | |||||||
10855 | OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { | ||||||
10856 | return Info.CCEDiag(E, D); | ||||||
10857 | } | ||||||
10858 | |||||||
10859 | // Returns true if visiting the RHS is necessary, false otherwise. | ||||||
10860 | bool VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, | ||||||
10861 | bool &SuppressRHSDiags); | ||||||
10862 | |||||||
10863 | bool VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, | ||||||
10864 | const BinaryOperator *E, APValue &Result); | ||||||
10865 | |||||||
10866 | void EvaluateExpr(const Expr *E, EvalResult &Result) { | ||||||
10867 | Result.Failed = !Evaluate(Result.Val, Info, E); | ||||||
10868 | if (Result.Failed) | ||||||
10869 | Result.Val = APValue(); | ||||||
10870 | } | ||||||
10871 | |||||||
10872 | void process(EvalResult &Result); | ||||||
10873 | |||||||
10874 | void enqueue(const Expr *E) { | ||||||
10875 | E = E->IgnoreParens(); | ||||||
10876 | Queue.resize(Queue.size()+1); | ||||||
10877 | Queue.back().E = E; | ||||||
10878 | Queue.back().Kind = Job::AnyExprKind; | ||||||
10879 | } | ||||||
10880 | }; | ||||||
10881 | |||||||
10882 | } | ||||||
10883 | |||||||
10884 | bool DataRecursiveIntBinOpEvaluator:: | ||||||
10885 | VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, | ||||||
10886 | bool &SuppressRHSDiags) { | ||||||
10887 | if (E->getOpcode() == BO_Comma) { | ||||||
10888 | // Ignore LHS but note if we could not evaluate it. | ||||||
10889 | if (LHSResult.Failed) | ||||||
10890 | return Info.noteSideEffect(); | ||||||
10891 | return true; | ||||||
10892 | } | ||||||
10893 | |||||||
10894 | if (E->isLogicalOp()) { | ||||||
10895 | bool LHSAsBool; | ||||||
10896 | if (!LHSResult.Failed && HandleConversionToBool(LHSResult.Val, LHSAsBool)) { | ||||||
10897 | // We were able to evaluate the LHS, see if we can get away with not | ||||||
10898 | // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 | ||||||
10899 | if (LHSAsBool == (E->getOpcode() == BO_LOr)) { | ||||||
10900 | Success(LHSAsBool, E, LHSResult.Val); | ||||||
10901 | return false; // Ignore RHS | ||||||
10902 | } | ||||||
10903 | } else { | ||||||
10904 | LHSResult.Failed = true; | ||||||
10905 | |||||||
10906 | // Since we weren't able to evaluate the left hand side, it | ||||||
10907 | // might have had side effects. | ||||||
10908 | if (!Info.noteSideEffect()) | ||||||
10909 | return false; | ||||||
10910 | |||||||
10911 | // We can't evaluate the LHS; however, sometimes the result | ||||||
10912 | // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. | ||||||
10913 | // Don't ignore RHS and suppress diagnostics from this arm. | ||||||
10914 | SuppressRHSDiags = true; | ||||||
10915 | } | ||||||
10916 | |||||||
10917 | return true; | ||||||
10918 | } | ||||||
10919 | |||||||
10920 | assert(E->getLHS()->getType()->isIntegralOrEnumerationType() &&((E->getLHS()->getType()->isIntegralOrEnumerationType () && E->getRHS()->getType()->isIntegralOrEnumerationType ()) ? static_cast<void> (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10921, __PRETTY_FUNCTION__)) | ||||||
10921 | E->getRHS()->getType()->isIntegralOrEnumerationType())((E->getLHS()->getType()->isIntegralOrEnumerationType () && E->getRHS()->getType()->isIntegralOrEnumerationType ()) ? static_cast<void> (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10921, __PRETTY_FUNCTION__)); | ||||||
10922 | |||||||
10923 | if (LHSResult.Failed && !Info.noteFailure()) | ||||||
10924 | return false; // Ignore RHS; | ||||||
10925 | |||||||
10926 | return true; | ||||||
10927 | } | ||||||
10928 | |||||||
10929 | static void addOrSubLValueAsInteger(APValue &LVal, const APSInt &Index, | ||||||
10930 | bool IsSub) { | ||||||
10931 | // Compute the new offset in the appropriate width, wrapping at 64 bits. | ||||||
10932 | // FIXME: When compiling for a 32-bit target, we should use 32-bit | ||||||
10933 | // offsets. | ||||||
10934 | assert(!LVal.hasLValuePath() && "have designator for integer lvalue")((!LVal.hasLValuePath() && "have designator for integer lvalue" ) ? static_cast<void> (0) : __assert_fail ("!LVal.hasLValuePath() && \"have designator for integer lvalue\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10934, __PRETTY_FUNCTION__)); | ||||||
10935 | CharUnits &Offset = LVal.getLValueOffset(); | ||||||
10936 | uint64_t Offset64 = Offset.getQuantity(); | ||||||
10937 | uint64_t Index64 = Index.extOrTrunc(64).getZExtValue(); | ||||||
10938 | Offset = CharUnits::fromQuantity(IsSub ? Offset64 - Index64 | ||||||
10939 | : Offset64 + Index64); | ||||||
10940 | } | ||||||
10941 | |||||||
10942 | bool DataRecursiveIntBinOpEvaluator:: | ||||||
10943 | VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, | ||||||
10944 | const BinaryOperator *E, APValue &Result) { | ||||||
10945 | if (E->getOpcode() == BO_Comma) { | ||||||
10946 | if (RHSResult.Failed) | ||||||
10947 | return false; | ||||||
10948 | Result = RHSResult.Val; | ||||||
10949 | return true; | ||||||
10950 | } | ||||||
10951 | |||||||
10952 | if (E->isLogicalOp()) { | ||||||
10953 | bool lhsResult, rhsResult; | ||||||
10954 | bool LHSIsOK = HandleConversionToBool(LHSResult.Val, lhsResult); | ||||||
10955 | bool RHSIsOK = HandleConversionToBool(RHSResult.Val, rhsResult); | ||||||
10956 | |||||||
10957 | if (LHSIsOK) { | ||||||
10958 | if (RHSIsOK) { | ||||||
10959 | if (E->getOpcode() == BO_LOr) | ||||||
10960 | return Success(lhsResult || rhsResult, E, Result); | ||||||
10961 | else | ||||||
10962 | return Success(lhsResult && rhsResult, E, Result); | ||||||
10963 | } | ||||||
10964 | } else { | ||||||
10965 | if (RHSIsOK) { | ||||||
10966 | // We can't evaluate the LHS; however, sometimes the result | ||||||
10967 | // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. | ||||||
10968 | if (rhsResult == (E->getOpcode() == BO_LOr)) | ||||||
10969 | return Success(rhsResult, E, Result); | ||||||
10970 | } | ||||||
10971 | } | ||||||
10972 | |||||||
10973 | return false; | ||||||
10974 | } | ||||||
10975 | |||||||
10976 | assert(E->getLHS()->getType()->isIntegralOrEnumerationType() &&((E->getLHS()->getType()->isIntegralOrEnumerationType () && E->getRHS()->getType()->isIntegralOrEnumerationType ()) ? static_cast<void> (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10977, __PRETTY_FUNCTION__)) | ||||||
10977 | E->getRHS()->getType()->isIntegralOrEnumerationType())((E->getLHS()->getType()->isIntegralOrEnumerationType () && E->getRHS()->getType()->isIntegralOrEnumerationType ()) ? static_cast<void> (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 10977, __PRETTY_FUNCTION__)); | ||||||
10978 | |||||||
10979 | if (LHSResult.Failed || RHSResult.Failed) | ||||||
10980 | return false; | ||||||
10981 | |||||||
10982 | const APValue &LHSVal = LHSResult.Val; | ||||||
10983 | const APValue &RHSVal = RHSResult.Val; | ||||||
10984 | |||||||
10985 | // Handle cases like (unsigned long)&a + 4. | ||||||
10986 | if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { | ||||||
10987 | Result = LHSVal; | ||||||
10988 | addOrSubLValueAsInteger(Result, RHSVal.getInt(), E->getOpcode() == BO_Sub); | ||||||
10989 | return true; | ||||||
10990 | } | ||||||
10991 | |||||||
10992 | // Handle cases like 4 + (unsigned long)&a | ||||||
10993 | if (E->getOpcode() == BO_Add && | ||||||
10994 | RHSVal.isLValue() && LHSVal.isInt()) { | ||||||
10995 | Result = RHSVal; | ||||||
10996 | addOrSubLValueAsInteger(Result, LHSVal.getInt(), /*IsSub*/false); | ||||||
10997 | return true; | ||||||
10998 | } | ||||||
10999 | |||||||
11000 | if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { | ||||||
11001 | // Handle (intptr_t)&&A - (intptr_t)&&B. | ||||||
11002 | if (!LHSVal.getLValueOffset().isZero() || | ||||||
11003 | !RHSVal.getLValueOffset().isZero()) | ||||||
11004 | return false; | ||||||
11005 | const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); | ||||||
11006 | const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); | ||||||
11007 | if (!LHSExpr || !RHSExpr) | ||||||
11008 | return false; | ||||||
11009 | const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); | ||||||
11010 | const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); | ||||||
11011 | if (!LHSAddrExpr || !RHSAddrExpr) | ||||||
11012 | return false; | ||||||
11013 | // Make sure both labels come from the same function. | ||||||
11014 | if (LHSAddrExpr->getLabel()->getDeclContext() != | ||||||
11015 | RHSAddrExpr->getLabel()->getDeclContext()) | ||||||
11016 | return false; | ||||||
11017 | Result = APValue(LHSAddrExpr, RHSAddrExpr); | ||||||
11018 | return true; | ||||||
11019 | } | ||||||
11020 | |||||||
11021 | // All the remaining cases expect both operands to be an integer | ||||||
11022 | if (!LHSVal.isInt() || !RHSVal.isInt()) | ||||||
11023 | return Error(E); | ||||||
11024 | |||||||
11025 | // Set up the width and signedness manually, in case it can't be deduced | ||||||
11026 | // from the operation we're performing. | ||||||
11027 | // FIXME: Don't do this in the cases where we can deduce it. | ||||||
11028 | APSInt Value(Info.Ctx.getIntWidth(E->getType()), | ||||||
11029 | E->getType()->isUnsignedIntegerOrEnumerationType()); | ||||||
11030 | if (!handleIntIntBinOp(Info, E, LHSVal.getInt(), E->getOpcode(), | ||||||
11031 | RHSVal.getInt(), Value)) | ||||||
11032 | return false; | ||||||
11033 | return Success(Value, E, Result); | ||||||
11034 | } | ||||||
11035 | |||||||
11036 | void DataRecursiveIntBinOpEvaluator::process(EvalResult &Result) { | ||||||
11037 | Job &job = Queue.back(); | ||||||
11038 | |||||||
11039 | switch (job.Kind) { | ||||||
11040 | case Job::AnyExprKind: { | ||||||
11041 | if (const BinaryOperator *Bop = dyn_cast<BinaryOperator>(job.E)) { | ||||||
11042 | if (shouldEnqueue(Bop)) { | ||||||
11043 | job.Kind = Job::BinOpKind; | ||||||
11044 | enqueue(Bop->getLHS()); | ||||||
11045 | return; | ||||||
11046 | } | ||||||
11047 | } | ||||||
11048 | |||||||
11049 | EvaluateExpr(job.E, Result); | ||||||
11050 | Queue.pop_back(); | ||||||
11051 | return; | ||||||
11052 | } | ||||||
11053 | |||||||
11054 | case Job::BinOpKind: { | ||||||
11055 | const BinaryOperator *Bop = cast<BinaryOperator>(job.E); | ||||||
11056 | bool SuppressRHSDiags = false; | ||||||
11057 | if (!VisitBinOpLHSOnly(Result, Bop, SuppressRHSDiags)) { | ||||||
11058 | Queue.pop_back(); | ||||||
11059 | return; | ||||||
11060 | } | ||||||
11061 | if (SuppressRHSDiags) | ||||||
11062 | job.startSpeculativeEval(Info); | ||||||
11063 | job.LHSResult.swap(Result); | ||||||
11064 | job.Kind = Job::BinOpVisitedLHSKind; | ||||||
11065 | enqueue(Bop->getRHS()); | ||||||
11066 | return; | ||||||
11067 | } | ||||||
11068 | |||||||
11069 | case Job::BinOpVisitedLHSKind: { | ||||||
11070 | const BinaryOperator *Bop = cast<BinaryOperator>(job.E); | ||||||
11071 | EvalResult RHS; | ||||||
11072 | RHS.swap(Result); | ||||||
11073 | Result.Failed = !VisitBinOp(job.LHSResult, RHS, Bop, Result.Val); | ||||||
11074 | Queue.pop_back(); | ||||||
11075 | return; | ||||||
11076 | } | ||||||
11077 | } | ||||||
11078 | |||||||
11079 | llvm_unreachable("Invalid Job::Kind!")::llvm::llvm_unreachable_internal("Invalid Job::Kind!", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11079); | ||||||
11080 | } | ||||||
11081 | |||||||
11082 | namespace { | ||||||
11083 | /// Used when we determine that we should fail, but can keep evaluating prior to | ||||||
11084 | /// noting that we had a failure. | ||||||
11085 | class DelayedNoteFailureRAII { | ||||||
11086 | EvalInfo &Info; | ||||||
11087 | bool NoteFailure; | ||||||
11088 | |||||||
11089 | public: | ||||||
11090 | DelayedNoteFailureRAII(EvalInfo &Info, bool NoteFailure = true) | ||||||
11091 | : Info(Info), NoteFailure(NoteFailure) {} | ||||||
11092 | ~DelayedNoteFailureRAII() { | ||||||
11093 | if (NoteFailure) { | ||||||
11094 | bool ContinueAfterFailure = Info.noteFailure(); | ||||||
11095 | (void)ContinueAfterFailure; | ||||||
11096 | assert(ContinueAfterFailure &&((ContinueAfterFailure && "Shouldn't have kept evaluating on failure." ) ? static_cast<void> (0) : __assert_fail ("ContinueAfterFailure && \"Shouldn't have kept evaluating on failure.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11097, __PRETTY_FUNCTION__)) | ||||||
11097 | "Shouldn't have kept evaluating on failure.")((ContinueAfterFailure && "Shouldn't have kept evaluating on failure." ) ? static_cast<void> (0) : __assert_fail ("ContinueAfterFailure && \"Shouldn't have kept evaluating on failure.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11097, __PRETTY_FUNCTION__)); | ||||||
11098 | } | ||||||
11099 | } | ||||||
11100 | }; | ||||||
11101 | } | ||||||
11102 | |||||||
11103 | template <class SuccessCB, class AfterCB> | ||||||
11104 | static bool | ||||||
11105 | EvaluateComparisonBinaryOperator(EvalInfo &Info, const BinaryOperator *E, | ||||||
11106 | SuccessCB &&Success, AfterCB &&DoAfter) { | ||||||
11107 | assert(E->isComparisonOp() && "expected comparison operator")((E->isComparisonOp() && "expected comparison operator" ) ? static_cast<void> (0) : __assert_fail ("E->isComparisonOp() && \"expected comparison operator\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11107, __PRETTY_FUNCTION__)); | ||||||
11108 | assert((E->getOpcode() == BO_Cmp ||(((E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType ()) && "unsupported binary expression evaluation") ? static_cast <void> (0) : __assert_fail ("(E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType()) && \"unsupported binary expression evaluation\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11110, __PRETTY_FUNCTION__)) | ||||||
11109 | E->getType()->isIntegralOrEnumerationType()) &&(((E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType ()) && "unsupported binary expression evaluation") ? static_cast <void> (0) : __assert_fail ("(E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType()) && \"unsupported binary expression evaluation\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11110, __PRETTY_FUNCTION__)) | ||||||
11110 | "unsupported binary expression evaluation")(((E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType ()) && "unsupported binary expression evaluation") ? static_cast <void> (0) : __assert_fail ("(E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType()) && \"unsupported binary expression evaluation\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11110, __PRETTY_FUNCTION__)); | ||||||
11111 | auto Error = [&](const Expr *E) { | ||||||
11112 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
11113 | return false; | ||||||
11114 | }; | ||||||
11115 | |||||||
11116 | using CCR = ComparisonCategoryResult; | ||||||
11117 | bool IsRelational = E->isRelationalOp(); | ||||||
11118 | bool IsEquality = E->isEqualityOp(); | ||||||
11119 | if (E->getOpcode() == BO_Cmp) { | ||||||
11120 | const ComparisonCategoryInfo &CmpInfo = | ||||||
11121 | Info.Ctx.CompCategories.getInfoForType(E->getType()); | ||||||
11122 | IsRelational = CmpInfo.isOrdered(); | ||||||
11123 | IsEquality = CmpInfo.isEquality(); | ||||||
11124 | } | ||||||
11125 | |||||||
11126 | QualType LHSTy = E->getLHS()->getType(); | ||||||
11127 | QualType RHSTy = E->getRHS()->getType(); | ||||||
11128 | |||||||
11129 | if (LHSTy->isIntegralOrEnumerationType() && | ||||||
11130 | RHSTy->isIntegralOrEnumerationType()) { | ||||||
11131 | APSInt LHS, RHS; | ||||||
11132 | bool LHSOK = EvaluateInteger(E->getLHS(), LHS, Info); | ||||||
11133 | if (!LHSOK && !Info.noteFailure()) | ||||||
11134 | return false; | ||||||
11135 | if (!EvaluateInteger(E->getRHS(), RHS, Info) || !LHSOK) | ||||||
11136 | return false; | ||||||
11137 | if (LHS < RHS) | ||||||
11138 | return Success(CCR::Less, E); | ||||||
11139 | if (LHS > RHS) | ||||||
11140 | return Success(CCR::Greater, E); | ||||||
11141 | return Success(CCR::Equal, E); | ||||||
11142 | } | ||||||
11143 | |||||||
11144 | if (LHSTy->isFixedPointType() || RHSTy->isFixedPointType()) { | ||||||
11145 | APFixedPoint LHSFX(Info.Ctx.getFixedPointSemantics(LHSTy)); | ||||||
11146 | APFixedPoint RHSFX(Info.Ctx.getFixedPointSemantics(RHSTy)); | ||||||
11147 | |||||||
11148 | bool LHSOK = EvaluateFixedPointOrInteger(E->getLHS(), LHSFX, Info); | ||||||
11149 | if (!LHSOK && !Info.noteFailure()) | ||||||
11150 | return false; | ||||||
11151 | if (!EvaluateFixedPointOrInteger(E->getRHS(), RHSFX, Info) || !LHSOK) | ||||||
11152 | return false; | ||||||
11153 | if (LHSFX < RHSFX) | ||||||
11154 | return Success(CCR::Less, E); | ||||||
11155 | if (LHSFX > RHSFX) | ||||||
11156 | return Success(CCR::Greater, E); | ||||||
11157 | return Success(CCR::Equal, E); | ||||||
11158 | } | ||||||
11159 | |||||||
11160 | if (LHSTy->isAnyComplexType() || RHSTy->isAnyComplexType()) { | ||||||
11161 | ComplexValue LHS, RHS; | ||||||
11162 | bool LHSOK; | ||||||
11163 | if (E->isAssignmentOp()) { | ||||||
11164 | LValue LV; | ||||||
11165 | EvaluateLValue(E->getLHS(), LV, Info); | ||||||
11166 | LHSOK = false; | ||||||
11167 | } else if (LHSTy->isRealFloatingType()) { | ||||||
11168 | LHSOK = EvaluateFloat(E->getLHS(), LHS.FloatReal, Info); | ||||||
11169 | if (LHSOK) { | ||||||
11170 | LHS.makeComplexFloat(); | ||||||
11171 | LHS.FloatImag = APFloat(LHS.FloatReal.getSemantics()); | ||||||
11172 | } | ||||||
11173 | } else { | ||||||
11174 | LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); | ||||||
11175 | } | ||||||
11176 | if (!LHSOK && !Info.noteFailure()) | ||||||
11177 | return false; | ||||||
11178 | |||||||
11179 | if (E->getRHS()->getType()->isRealFloatingType()) { | ||||||
11180 | if (!EvaluateFloat(E->getRHS(), RHS.FloatReal, Info) || !LHSOK) | ||||||
11181 | return false; | ||||||
11182 | RHS.makeComplexFloat(); | ||||||
11183 | RHS.FloatImag = APFloat(RHS.FloatReal.getSemantics()); | ||||||
11184 | } else if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) | ||||||
11185 | return false; | ||||||
11186 | |||||||
11187 | if (LHS.isComplexFloat()) { | ||||||
11188 | APFloat::cmpResult CR_r = | ||||||
11189 | LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); | ||||||
11190 | APFloat::cmpResult CR_i = | ||||||
11191 | LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); | ||||||
11192 | bool IsEqual = CR_r == APFloat::cmpEqual && CR_i == APFloat::cmpEqual; | ||||||
11193 | return Success(IsEqual ? CCR::Equal : CCR::Nonequal, E); | ||||||
11194 | } else { | ||||||
11195 | assert(IsEquality && "invalid complex comparison")((IsEquality && "invalid complex comparison") ? static_cast <void> (0) : __assert_fail ("IsEquality && \"invalid complex comparison\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11195, __PRETTY_FUNCTION__)); | ||||||
11196 | bool IsEqual = LHS.getComplexIntReal() == RHS.getComplexIntReal() && | ||||||
11197 | LHS.getComplexIntImag() == RHS.getComplexIntImag(); | ||||||
11198 | return Success(IsEqual ? CCR::Equal : CCR::Nonequal, E); | ||||||
11199 | } | ||||||
11200 | } | ||||||
11201 | |||||||
11202 | if (LHSTy->isRealFloatingType() && | ||||||
11203 | RHSTy->isRealFloatingType()) { | ||||||
11204 | APFloat RHS(0.0), LHS(0.0); | ||||||
11205 | |||||||
11206 | bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); | ||||||
11207 | if (!LHSOK && !Info.noteFailure()) | ||||||
11208 | return false; | ||||||
11209 | |||||||
11210 | if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) | ||||||
11211 | return false; | ||||||
11212 | |||||||
11213 | assert(E->isComparisonOp() && "Invalid binary operator!")((E->isComparisonOp() && "Invalid binary operator!" ) ? static_cast<void> (0) : __assert_fail ("E->isComparisonOp() && \"Invalid binary operator!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11213, __PRETTY_FUNCTION__)); | ||||||
11214 | auto GetCmpRes = [&]() { | ||||||
11215 | switch (LHS.compare(RHS)) { | ||||||
11216 | case APFloat::cmpEqual: | ||||||
11217 | return CCR::Equal; | ||||||
11218 | case APFloat::cmpLessThan: | ||||||
11219 | return CCR::Less; | ||||||
11220 | case APFloat::cmpGreaterThan: | ||||||
11221 | return CCR::Greater; | ||||||
11222 | case APFloat::cmpUnordered: | ||||||
11223 | return CCR::Unordered; | ||||||
11224 | } | ||||||
11225 | llvm_unreachable("Unrecognised APFloat::cmpResult enum")::llvm::llvm_unreachable_internal("Unrecognised APFloat::cmpResult enum" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11225); | ||||||
11226 | }; | ||||||
11227 | return Success(GetCmpRes(), E); | ||||||
11228 | } | ||||||
11229 | |||||||
11230 | if (LHSTy->isPointerType() && RHSTy->isPointerType()) { | ||||||
11231 | LValue LHSValue, RHSValue; | ||||||
11232 | |||||||
11233 | bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); | ||||||
11234 | if (!LHSOK && !Info.noteFailure()) | ||||||
11235 | return false; | ||||||
11236 | |||||||
11237 | if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) | ||||||
11238 | return false; | ||||||
11239 | |||||||
11240 | // Reject differing bases from the normal codepath; we special-case | ||||||
11241 | // comparisons to null. | ||||||
11242 | if (!HasSameBase(LHSValue, RHSValue)) { | ||||||
11243 | // Inequalities and subtractions between unrelated pointers have | ||||||
11244 | // unspecified or undefined behavior. | ||||||
11245 | if (!IsEquality) | ||||||
11246 | return Error(E); | ||||||
11247 | // A constant address may compare equal to the address of a symbol. | ||||||
11248 | // The one exception is that address of an object cannot compare equal | ||||||
11249 | // to a null pointer constant. | ||||||
11250 | if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || | ||||||
11251 | (!RHSValue.Base && !RHSValue.Offset.isZero())) | ||||||
11252 | return Error(E); | ||||||
11253 | // It's implementation-defined whether distinct literals will have | ||||||
11254 | // distinct addresses. In clang, the result of such a comparison is | ||||||
11255 | // unspecified, so it is not a constant expression. However, we do know | ||||||
11256 | // that the address of a literal will be non-null. | ||||||
11257 | if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && | ||||||
11258 | LHSValue.Base && RHSValue.Base) | ||||||
11259 | return Error(E); | ||||||
11260 | // We can't tell whether weak symbols will end up pointing to the same | ||||||
11261 | // object. | ||||||
11262 | if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) | ||||||
11263 | return Error(E); | ||||||
11264 | // We can't compare the address of the start of one object with the | ||||||
11265 | // past-the-end address of another object, per C++ DR1652. | ||||||
11266 | if ((LHSValue.Base && LHSValue.Offset.isZero() && | ||||||
11267 | isOnePastTheEndOfCompleteObject(Info.Ctx, RHSValue)) || | ||||||
11268 | (RHSValue.Base && RHSValue.Offset.isZero() && | ||||||
11269 | isOnePastTheEndOfCompleteObject(Info.Ctx, LHSValue))) | ||||||
11270 | return Error(E); | ||||||
11271 | // We can't tell whether an object is at the same address as another | ||||||
11272 | // zero sized object. | ||||||
11273 | if ((RHSValue.Base && isZeroSized(LHSValue)) || | ||||||
11274 | (LHSValue.Base && isZeroSized(RHSValue))) | ||||||
11275 | return Error(E); | ||||||
11276 | return Success(CCR::Nonequal, E); | ||||||
11277 | } | ||||||
11278 | |||||||
11279 | const CharUnits &LHSOffset = LHSValue.getLValueOffset(); | ||||||
11280 | const CharUnits &RHSOffset = RHSValue.getLValueOffset(); | ||||||
11281 | |||||||
11282 | SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); | ||||||
11283 | SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); | ||||||
11284 | |||||||
11285 | // C++11 [expr.rel]p3: | ||||||
11286 | // Pointers to void (after pointer conversions) can be compared, with a | ||||||
11287 | // result defined as follows: If both pointers represent the same | ||||||
11288 | // address or are both the null pointer value, the result is true if the | ||||||
11289 | // operator is <= or >= and false otherwise; otherwise the result is | ||||||
11290 | // unspecified. | ||||||
11291 | // We interpret this as applying to pointers to *cv* void. | ||||||
11292 | if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && IsRelational) | ||||||
11293 | Info.CCEDiag(E, diag::note_constexpr_void_comparison); | ||||||
11294 | |||||||
11295 | // C++11 [expr.rel]p2: | ||||||
11296 | // - If two pointers point to non-static data members of the same object, | ||||||
11297 | // or to subobjects or array elements fo such members, recursively, the | ||||||
11298 | // pointer to the later declared member compares greater provided the | ||||||
11299 | // two members have the same access control and provided their class is | ||||||
11300 | // not a union. | ||||||
11301 | // [...] | ||||||
11302 | // - Otherwise pointer comparisons are unspecified. | ||||||
11303 | if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && IsRelational) { | ||||||
11304 | bool WasArrayIndex; | ||||||
11305 | unsigned Mismatch = FindDesignatorMismatch( | ||||||
11306 | getType(LHSValue.Base), LHSDesignator, RHSDesignator, WasArrayIndex); | ||||||
11307 | // At the point where the designators diverge, the comparison has a | ||||||
11308 | // specified value if: | ||||||
11309 | // - we are comparing array indices | ||||||
11310 | // - we are comparing fields of a union, or fields with the same access | ||||||
11311 | // Otherwise, the result is unspecified and thus the comparison is not a | ||||||
11312 | // constant expression. | ||||||
11313 | if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && | ||||||
11314 | Mismatch < RHSDesignator.Entries.size()) { | ||||||
11315 | const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); | ||||||
11316 | const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); | ||||||
11317 | if (!LF && !RF) | ||||||
11318 | Info.CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); | ||||||
11319 | else if (!LF) | ||||||
11320 | Info.CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) | ||||||
11321 | << getAsBaseClass(LHSDesignator.Entries[Mismatch]) | ||||||
11322 | << RF->getParent() << RF; | ||||||
11323 | else if (!RF) | ||||||
11324 | Info.CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) | ||||||
11325 | << getAsBaseClass(RHSDesignator.Entries[Mismatch]) | ||||||
11326 | << LF->getParent() << LF; | ||||||
11327 | else if (!LF->getParent()->isUnion() && | ||||||
11328 | LF->getAccess() != RF->getAccess()) | ||||||
11329 | Info.CCEDiag(E, | ||||||
11330 | diag::note_constexpr_pointer_comparison_differing_access) | ||||||
11331 | << LF << LF->getAccess() << RF << RF->getAccess() | ||||||
11332 | << LF->getParent(); | ||||||
11333 | } | ||||||
11334 | } | ||||||
11335 | |||||||
11336 | // The comparison here must be unsigned, and performed with the same | ||||||
11337 | // width as the pointer. | ||||||
11338 | unsigned PtrSize = Info.Ctx.getTypeSize(LHSTy); | ||||||
11339 | uint64_t CompareLHS = LHSOffset.getQuantity(); | ||||||
11340 | uint64_t CompareRHS = RHSOffset.getQuantity(); | ||||||
11341 | assert(PtrSize <= 64 && "Unexpected pointer width")((PtrSize <= 64 && "Unexpected pointer width") ? static_cast <void> (0) : __assert_fail ("PtrSize <= 64 && \"Unexpected pointer width\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11341, __PRETTY_FUNCTION__)); | ||||||
11342 | uint64_t Mask = ~0ULL >> (64 - PtrSize); | ||||||
11343 | CompareLHS &= Mask; | ||||||
11344 | CompareRHS &= Mask; | ||||||
11345 | |||||||
11346 | // If there is a base and this is a relational operator, we can only | ||||||
11347 | // compare pointers within the object in question; otherwise, the result | ||||||
11348 | // depends on where the object is located in memory. | ||||||
11349 | if (!LHSValue.Base.isNull() && IsRelational) { | ||||||
11350 | QualType BaseTy = getType(LHSValue.Base); | ||||||
11351 | if (BaseTy->isIncompleteType()) | ||||||
11352 | return Error(E); | ||||||
11353 | CharUnits Size = Info.Ctx.getTypeSizeInChars(BaseTy); | ||||||
11354 | uint64_t OffsetLimit = Size.getQuantity(); | ||||||
11355 | if (CompareLHS > OffsetLimit || CompareRHS > OffsetLimit) | ||||||
11356 | return Error(E); | ||||||
11357 | } | ||||||
11358 | |||||||
11359 | if (CompareLHS < CompareRHS) | ||||||
11360 | return Success(CCR::Less, E); | ||||||
11361 | if (CompareLHS > CompareRHS) | ||||||
11362 | return Success(CCR::Greater, E); | ||||||
11363 | return Success(CCR::Equal, E); | ||||||
11364 | } | ||||||
11365 | |||||||
11366 | if (LHSTy->isMemberPointerType()) { | ||||||
11367 | assert(IsEquality && "unexpected member pointer operation")((IsEquality && "unexpected member pointer operation" ) ? static_cast<void> (0) : __assert_fail ("IsEquality && \"unexpected member pointer operation\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11367, __PRETTY_FUNCTION__)); | ||||||
11368 | assert(RHSTy->isMemberPointerType() && "invalid comparison")((RHSTy->isMemberPointerType() && "invalid comparison" ) ? static_cast<void> (0) : __assert_fail ("RHSTy->isMemberPointerType() && \"invalid comparison\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11368, __PRETTY_FUNCTION__)); | ||||||
11369 | |||||||
11370 | MemberPtr LHSValue, RHSValue; | ||||||
11371 | |||||||
11372 | bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); | ||||||
11373 | if (!LHSOK && !Info.noteFailure()) | ||||||
11374 | return false; | ||||||
11375 | |||||||
11376 | if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) | ||||||
11377 | return false; | ||||||
11378 | |||||||
11379 | // C++11 [expr.eq]p2: | ||||||
11380 | // If both operands are null, they compare equal. Otherwise if only one is | ||||||
11381 | // null, they compare unequal. | ||||||
11382 | if (!LHSValue.getDecl() || !RHSValue.getDecl()) { | ||||||
11383 | bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); | ||||||
11384 | return Success(Equal ? CCR::Equal : CCR::Nonequal, E); | ||||||
11385 | } | ||||||
11386 | |||||||
11387 | // Otherwise if either is a pointer to a virtual member function, the | ||||||
11388 | // result is unspecified. | ||||||
11389 | if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) | ||||||
11390 | if (MD->isVirtual()) | ||||||
11391 | Info.CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; | ||||||
11392 | if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) | ||||||
11393 | if (MD->isVirtual()) | ||||||
11394 | Info.CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; | ||||||
11395 | |||||||
11396 | // Otherwise they compare equal if and only if they would refer to the | ||||||
11397 | // same member of the same most derived object or the same subobject if | ||||||
11398 | // they were dereferenced with a hypothetical object of the associated | ||||||
11399 | // class type. | ||||||
11400 | bool Equal = LHSValue == RHSValue; | ||||||
11401 | return Success(Equal ? CCR::Equal : CCR::Nonequal, E); | ||||||
11402 | } | ||||||
11403 | |||||||
11404 | if (LHSTy->isNullPtrType()) { | ||||||
11405 | assert(E->isComparisonOp() && "unexpected nullptr operation")((E->isComparisonOp() && "unexpected nullptr operation" ) ? static_cast<void> (0) : __assert_fail ("E->isComparisonOp() && \"unexpected nullptr operation\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11405, __PRETTY_FUNCTION__)); | ||||||
11406 | assert(RHSTy->isNullPtrType() && "missing pointer conversion")((RHSTy->isNullPtrType() && "missing pointer conversion" ) ? static_cast<void> (0) : __assert_fail ("RHSTy->isNullPtrType() && \"missing pointer conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11406, __PRETTY_FUNCTION__)); | ||||||
11407 | // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t | ||||||
11408 | // are compared, the result is true of the operator is <=, >= or ==, and | ||||||
11409 | // false otherwise. | ||||||
11410 | return Success(CCR::Equal, E); | ||||||
11411 | } | ||||||
11412 | |||||||
11413 | return DoAfter(); | ||||||
11414 | } | ||||||
11415 | |||||||
11416 | bool RecordExprEvaluator::VisitBinCmp(const BinaryOperator *E) { | ||||||
11417 | if (!CheckLiteralType(Info, E)) | ||||||
11418 | return false; | ||||||
11419 | |||||||
11420 | auto OnSuccess = [&](ComparisonCategoryResult ResKind, | ||||||
11421 | const BinaryOperator *E) { | ||||||
11422 | // Evaluation succeeded. Lookup the information for the comparison category | ||||||
11423 | // type and fetch the VarDecl for the result. | ||||||
11424 | const ComparisonCategoryInfo &CmpInfo = | ||||||
11425 | Info.Ctx.CompCategories.getInfoForType(E->getType()); | ||||||
11426 | const VarDecl *VD = | ||||||
11427 | CmpInfo.getValueInfo(CmpInfo.makeWeakResult(ResKind))->VD; | ||||||
11428 | // Check and evaluate the result as a constant expression. | ||||||
11429 | LValue LV; | ||||||
11430 | LV.set(VD); | ||||||
11431 | if (!handleLValueToRValueConversion(Info, E, E->getType(), LV, Result)) | ||||||
11432 | return false; | ||||||
11433 | return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result); | ||||||
11434 | }; | ||||||
11435 | return EvaluateComparisonBinaryOperator(Info, E, OnSuccess, [&]() { | ||||||
11436 | return ExprEvaluatorBaseTy::VisitBinCmp(E); | ||||||
11437 | }); | ||||||
11438 | } | ||||||
11439 | |||||||
11440 | bool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | ||||||
11441 | // We don't call noteFailure immediately because the assignment happens after | ||||||
11442 | // we evaluate LHS and RHS. | ||||||
11443 | if (!Info.keepEvaluatingAfterFailure() && E->isAssignmentOp()) | ||||||
11444 | return Error(E); | ||||||
11445 | |||||||
11446 | DelayedNoteFailureRAII MaybeNoteFailureLater(Info, E->isAssignmentOp()); | ||||||
11447 | if (DataRecursiveIntBinOpEvaluator::shouldEnqueue(E)) | ||||||
11448 | return DataRecursiveIntBinOpEvaluator(*this, Result).Traverse(E); | ||||||
11449 | |||||||
11450 | assert((!E->getLHS()->getType()->isIntegralOrEnumerationType() ||(((!E->getLHS()->getType()->isIntegralOrEnumerationType () || !E->getRHS()->getType()->isIntegralOrEnumerationType ()) && "DataRecursiveIntBinOpEvaluator should have handled integral types" ) ? static_cast<void> (0) : __assert_fail ("(!E->getLHS()->getType()->isIntegralOrEnumerationType() || !E->getRHS()->getType()->isIntegralOrEnumerationType()) && \"DataRecursiveIntBinOpEvaluator should have handled integral types\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11452, __PRETTY_FUNCTION__)) | ||||||
11451 | !E->getRHS()->getType()->isIntegralOrEnumerationType()) &&(((!E->getLHS()->getType()->isIntegralOrEnumerationType () || !E->getRHS()->getType()->isIntegralOrEnumerationType ()) && "DataRecursiveIntBinOpEvaluator should have handled integral types" ) ? static_cast<void> (0) : __assert_fail ("(!E->getLHS()->getType()->isIntegralOrEnumerationType() || !E->getRHS()->getType()->isIntegralOrEnumerationType()) && \"DataRecursiveIntBinOpEvaluator should have handled integral types\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11452, __PRETTY_FUNCTION__)) | ||||||
11452 | "DataRecursiveIntBinOpEvaluator should have handled integral types")(((!E->getLHS()->getType()->isIntegralOrEnumerationType () || !E->getRHS()->getType()->isIntegralOrEnumerationType ()) && "DataRecursiveIntBinOpEvaluator should have handled integral types" ) ? static_cast<void> (0) : __assert_fail ("(!E->getLHS()->getType()->isIntegralOrEnumerationType() || !E->getRHS()->getType()->isIntegralOrEnumerationType()) && \"DataRecursiveIntBinOpEvaluator should have handled integral types\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11452, __PRETTY_FUNCTION__)); | ||||||
11453 | |||||||
11454 | if (E->isComparisonOp()) { | ||||||
11455 | // Evaluate builtin binary comparisons by evaluating them as C++2a three-way | ||||||
11456 | // comparisons and then translating the result. | ||||||
11457 | auto OnSuccess = [&](ComparisonCategoryResult ResKind, | ||||||
11458 | const BinaryOperator *E) { | ||||||
11459 | using CCR = ComparisonCategoryResult; | ||||||
11460 | bool IsEqual = ResKind == CCR::Equal, | ||||||
11461 | IsLess = ResKind == CCR::Less, | ||||||
11462 | IsGreater = ResKind == CCR::Greater; | ||||||
11463 | auto Op = E->getOpcode(); | ||||||
11464 | switch (Op) { | ||||||
11465 | default: | ||||||
11466 | llvm_unreachable("unsupported binary operator")::llvm::llvm_unreachable_internal("unsupported binary operator" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11466); | ||||||
11467 | case BO_EQ: | ||||||
11468 | case BO_NE: | ||||||
11469 | return Success(IsEqual == (Op == BO_EQ), E); | ||||||
11470 | case BO_LT: return Success(IsLess, E); | ||||||
11471 | case BO_GT: return Success(IsGreater, E); | ||||||
11472 | case BO_LE: return Success(IsEqual || IsLess, E); | ||||||
11473 | case BO_GE: return Success(IsEqual || IsGreater, E); | ||||||
11474 | } | ||||||
11475 | }; | ||||||
11476 | return EvaluateComparisonBinaryOperator(Info, E, OnSuccess, [&]() { | ||||||
11477 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | ||||||
11478 | }); | ||||||
11479 | } | ||||||
11480 | |||||||
11481 | QualType LHSTy = E->getLHS()->getType(); | ||||||
11482 | QualType RHSTy = E->getRHS()->getType(); | ||||||
11483 | |||||||
11484 | if (LHSTy->isPointerType() && RHSTy->isPointerType() && | ||||||
11485 | E->getOpcode() == BO_Sub) { | ||||||
11486 | LValue LHSValue, RHSValue; | ||||||
11487 | |||||||
11488 | bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); | ||||||
11489 | if (!LHSOK && !Info.noteFailure()) | ||||||
11490 | return false; | ||||||
11491 | |||||||
11492 | if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) | ||||||
11493 | return false; | ||||||
11494 | |||||||
11495 | // Reject differing bases from the normal codepath; we special-case | ||||||
11496 | // comparisons to null. | ||||||
11497 | if (!HasSameBase(LHSValue, RHSValue)) { | ||||||
11498 | // Handle &&A - &&B. | ||||||
11499 | if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) | ||||||
11500 | return Error(E); | ||||||
11501 | const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr *>(); | ||||||
11502 | const Expr *RHSExpr = RHSValue.Base.dyn_cast<const Expr *>(); | ||||||
11503 | if (!LHSExpr || !RHSExpr) | ||||||
11504 | return Error(E); | ||||||
11505 | const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); | ||||||
11506 | const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); | ||||||
11507 | if (!LHSAddrExpr || !RHSAddrExpr) | ||||||
11508 | return Error(E); | ||||||
11509 | // Make sure both labels come from the same function. | ||||||
11510 | if (LHSAddrExpr->getLabel()->getDeclContext() != | ||||||
11511 | RHSAddrExpr->getLabel()->getDeclContext()) | ||||||
11512 | return Error(E); | ||||||
11513 | return Success(APValue(LHSAddrExpr, RHSAddrExpr), E); | ||||||
11514 | } | ||||||
11515 | const CharUnits &LHSOffset = LHSValue.getLValueOffset(); | ||||||
11516 | const CharUnits &RHSOffset = RHSValue.getLValueOffset(); | ||||||
11517 | |||||||
11518 | SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); | ||||||
11519 | SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); | ||||||
11520 | |||||||
11521 | // C++11 [expr.add]p6: | ||||||
11522 | // Unless both pointers point to elements of the same array object, or | ||||||
11523 | // one past the last element of the array object, the behavior is | ||||||
11524 | // undefined. | ||||||
11525 | if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && | ||||||
11526 | !AreElementsOfSameArray(getType(LHSValue.Base), LHSDesignator, | ||||||
11527 | RHSDesignator)) | ||||||
11528 | Info.CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); | ||||||
11529 | |||||||
11530 | QualType Type = E->getLHS()->getType(); | ||||||
11531 | QualType ElementType = Type->getAs<PointerType>()->getPointeeType(); | ||||||
11532 | |||||||
11533 | CharUnits ElementSize; | ||||||
11534 | if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize)) | ||||||
11535 | return false; | ||||||
11536 | |||||||
11537 | // As an extension, a type may have zero size (empty struct or union in | ||||||
11538 | // C, array of zero length). Pointer subtraction in such cases has | ||||||
11539 | // undefined behavior, so is not constant. | ||||||
11540 | if (ElementSize.isZero()) { | ||||||
11541 | Info.FFDiag(E, diag::note_constexpr_pointer_subtraction_zero_size) | ||||||
11542 | << ElementType; | ||||||
11543 | return false; | ||||||
11544 | } | ||||||
11545 | |||||||
11546 | // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, | ||||||
11547 | // and produce incorrect results when it overflows. Such behavior | ||||||
11548 | // appears to be non-conforming, but is common, so perhaps we should | ||||||
11549 | // assume the standard intended for such cases to be undefined behavior | ||||||
11550 | // and check for them. | ||||||
11551 | |||||||
11552 | // Compute (LHSOffset - RHSOffset) / Size carefully, checking for | ||||||
11553 | // overflow in the final conversion to ptrdiff_t. | ||||||
11554 | APSInt LHS(llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); | ||||||
11555 | APSInt RHS(llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); | ||||||
11556 | APSInt ElemSize(llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), | ||||||
11557 | false); | ||||||
11558 | APSInt TrueResult = (LHS - RHS) / ElemSize; | ||||||
11559 | APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); | ||||||
11560 | |||||||
11561 | if (Result.extend(65) != TrueResult && | ||||||
11562 | !HandleOverflow(Info, E, TrueResult, E->getType())) | ||||||
11563 | return false; | ||||||
11564 | return Success(Result, E); | ||||||
11565 | } | ||||||
11566 | |||||||
11567 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | ||||||
11568 | } | ||||||
11569 | |||||||
11570 | /// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with | ||||||
11571 | /// a result as the expression's type. | ||||||
11572 | bool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( | ||||||
11573 | const UnaryExprOrTypeTraitExpr *E) { | ||||||
11574 | switch(E->getKind()) { | ||||||
11575 | case UETT_PreferredAlignOf: | ||||||
11576 | case UETT_AlignOf: { | ||||||
11577 | if (E->isArgumentType()) | ||||||
11578 | return Success(GetAlignOfType(Info, E->getArgumentType(), E->getKind()), | ||||||
11579 | E); | ||||||
11580 | else | ||||||
11581 | return Success(GetAlignOfExpr(Info, E->getArgumentExpr(), E->getKind()), | ||||||
11582 | E); | ||||||
11583 | } | ||||||
11584 | |||||||
11585 | case UETT_VecStep: { | ||||||
11586 | QualType Ty = E->getTypeOfArgument(); | ||||||
11587 | |||||||
11588 | if (Ty->isVectorType()) { | ||||||
11589 | unsigned n = Ty->castAs<VectorType>()->getNumElements(); | ||||||
11590 | |||||||
11591 | // The vec_step built-in functions that take a 3-component | ||||||
11592 | // vector return 4. (OpenCL 1.1 spec 6.11.12) | ||||||
11593 | if (n == 3) | ||||||
11594 | n = 4; | ||||||
11595 | |||||||
11596 | return Success(n, E); | ||||||
11597 | } else | ||||||
11598 | return Success(1, E); | ||||||
11599 | } | ||||||
11600 | |||||||
11601 | case UETT_SizeOf: { | ||||||
11602 | QualType SrcTy = E->getTypeOfArgument(); | ||||||
11603 | // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, | ||||||
11604 | // the result is the size of the referenced type." | ||||||
11605 | if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) | ||||||
11606 | SrcTy = Ref->getPointeeType(); | ||||||
11607 | |||||||
11608 | CharUnits Sizeof; | ||||||
11609 | if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof)) | ||||||
11610 | return false; | ||||||
11611 | return Success(Sizeof, E); | ||||||
11612 | } | ||||||
11613 | case UETT_OpenMPRequiredSimdAlign: | ||||||
11614 | assert(E->isArgumentType())((E->isArgumentType()) ? static_cast<void> (0) : __assert_fail ("E->isArgumentType()", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11614, __PRETTY_FUNCTION__)); | ||||||
11615 | return Success( | ||||||
11616 | Info.Ctx.toCharUnitsFromBits( | ||||||
11617 | Info.Ctx.getOpenMPDefaultSimdAlign(E->getArgumentType())) | ||||||
11618 | .getQuantity(), | ||||||
11619 | E); | ||||||
11620 | } | ||||||
11621 | |||||||
11622 | llvm_unreachable("unknown expr/type trait")::llvm::llvm_unreachable_internal("unknown expr/type trait", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11622); | ||||||
11623 | } | ||||||
11624 | |||||||
11625 | bool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { | ||||||
11626 | CharUnits Result; | ||||||
11627 | unsigned n = OOE->getNumComponents(); | ||||||
11628 | if (n == 0) | ||||||
11629 | return Error(OOE); | ||||||
11630 | QualType CurrentType = OOE->getTypeSourceInfo()->getType(); | ||||||
11631 | for (unsigned i = 0; i != n; ++i) { | ||||||
11632 | OffsetOfNode ON = OOE->getComponent(i); | ||||||
11633 | switch (ON.getKind()) { | ||||||
11634 | case OffsetOfNode::Array: { | ||||||
11635 | const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); | ||||||
11636 | APSInt IdxResult; | ||||||
11637 | if (!EvaluateInteger(Idx, IdxResult, Info)) | ||||||
11638 | return false; | ||||||
11639 | const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); | ||||||
11640 | if (!AT) | ||||||
11641 | return Error(OOE); | ||||||
11642 | CurrentType = AT->getElementType(); | ||||||
11643 | CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); | ||||||
11644 | Result += IdxResult.getSExtValue() * ElementSize; | ||||||
11645 | break; | ||||||
11646 | } | ||||||
11647 | |||||||
11648 | case OffsetOfNode::Field: { | ||||||
11649 | FieldDecl *MemberDecl = ON.getField(); | ||||||
11650 | const RecordType *RT = CurrentType->getAs<RecordType>(); | ||||||
11651 | if (!RT) | ||||||
11652 | return Error(OOE); | ||||||
11653 | RecordDecl *RD = RT->getDecl(); | ||||||
11654 | if (RD->isInvalidDecl()) return false; | ||||||
11655 | const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); | ||||||
11656 | unsigned i = MemberDecl->getFieldIndex(); | ||||||
11657 | assert(i < RL.getFieldCount() && "offsetof field in wrong type")((i < RL.getFieldCount() && "offsetof field in wrong type" ) ? static_cast<void> (0) : __assert_fail ("i < RL.getFieldCount() && \"offsetof field in wrong type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11657, __PRETTY_FUNCTION__)); | ||||||
11658 | Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); | ||||||
11659 | CurrentType = MemberDecl->getType().getNonReferenceType(); | ||||||
11660 | break; | ||||||
11661 | } | ||||||
11662 | |||||||
11663 | case OffsetOfNode::Identifier: | ||||||
11664 | llvm_unreachable("dependent __builtin_offsetof")::llvm::llvm_unreachable_internal("dependent __builtin_offsetof" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11664); | ||||||
11665 | |||||||
11666 | case OffsetOfNode::Base: { | ||||||
11667 | CXXBaseSpecifier *BaseSpec = ON.getBase(); | ||||||
11668 | if (BaseSpec->isVirtual()) | ||||||
11669 | return Error(OOE); | ||||||
11670 | |||||||
11671 | // Find the layout of the class whose base we are looking into. | ||||||
11672 | const RecordType *RT = CurrentType->getAs<RecordType>(); | ||||||
11673 | if (!RT) | ||||||
11674 | return Error(OOE); | ||||||
11675 | RecordDecl *RD = RT->getDecl(); | ||||||
11676 | if (RD->isInvalidDecl()) return false; | ||||||
11677 | const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); | ||||||
11678 | |||||||
11679 | // Find the base class itself. | ||||||
11680 | CurrentType = BaseSpec->getType(); | ||||||
11681 | const RecordType *BaseRT = CurrentType->getAs<RecordType>(); | ||||||
11682 | if (!BaseRT) | ||||||
11683 | return Error(OOE); | ||||||
11684 | |||||||
11685 | // Add the offset to the base. | ||||||
11686 | Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); | ||||||
11687 | break; | ||||||
11688 | } | ||||||
11689 | } | ||||||
11690 | } | ||||||
11691 | return Success(Result, OOE); | ||||||
11692 | } | ||||||
11693 | |||||||
11694 | bool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { | ||||||
11695 | switch (E->getOpcode()) { | ||||||
11696 | default: | ||||||
11697 | // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. | ||||||
11698 | // See C99 6.6p3. | ||||||
11699 | return Error(E); | ||||||
11700 | case UO_Extension: | ||||||
11701 | // FIXME: Should extension allow i-c-e extension expressions in its scope? | ||||||
11702 | // If so, we could clear the diagnostic ID. | ||||||
11703 | return Visit(E->getSubExpr()); | ||||||
11704 | case UO_Plus: | ||||||
11705 | // The result is just the value. | ||||||
11706 | return Visit(E->getSubExpr()); | ||||||
11707 | case UO_Minus: { | ||||||
11708 | if (!Visit(E->getSubExpr())) | ||||||
11709 | return false; | ||||||
11710 | if (!Result.isInt()) return Error(E); | ||||||
11711 | const APSInt &Value = Result.getInt(); | ||||||
11712 | if (Value.isSigned() && Value.isMinSignedValue() && E->canOverflow() && | ||||||
11713 | !HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), | ||||||
11714 | E->getType())) | ||||||
11715 | return false; | ||||||
11716 | return Success(-Value, E); | ||||||
11717 | } | ||||||
11718 | case UO_Not: { | ||||||
11719 | if (!Visit(E->getSubExpr())) | ||||||
11720 | return false; | ||||||
11721 | if (!Result.isInt()) return Error(E); | ||||||
11722 | return Success(~Result.getInt(), E); | ||||||
11723 | } | ||||||
11724 | case UO_LNot: { | ||||||
11725 | bool bres; | ||||||
11726 | if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) | ||||||
11727 | return false; | ||||||
11728 | return Success(!bres, E); | ||||||
11729 | } | ||||||
11730 | } | ||||||
11731 | } | ||||||
11732 | |||||||
11733 | /// HandleCast - This is used to evaluate implicit or explicit casts where the | ||||||
11734 | /// result type is integer. | ||||||
11735 | bool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { | ||||||
11736 | const Expr *SubExpr = E->getSubExpr(); | ||||||
11737 | QualType DestType = E->getType(); | ||||||
11738 | QualType SrcType = SubExpr->getType(); | ||||||
11739 | |||||||
11740 | switch (E->getCastKind()) { | ||||||
11741 | case CK_BaseToDerived: | ||||||
11742 | case CK_DerivedToBase: | ||||||
11743 | case CK_UncheckedDerivedToBase: | ||||||
11744 | case CK_Dynamic: | ||||||
11745 | case CK_ToUnion: | ||||||
11746 | case CK_ArrayToPointerDecay: | ||||||
11747 | case CK_FunctionToPointerDecay: | ||||||
11748 | case CK_NullToPointer: | ||||||
11749 | case CK_NullToMemberPointer: | ||||||
11750 | case CK_BaseToDerivedMemberPointer: | ||||||
11751 | case CK_DerivedToBaseMemberPointer: | ||||||
11752 | case CK_ReinterpretMemberPointer: | ||||||
11753 | case CK_ConstructorConversion: | ||||||
11754 | case CK_IntegralToPointer: | ||||||
11755 | case CK_ToVoid: | ||||||
11756 | case CK_VectorSplat: | ||||||
11757 | case CK_IntegralToFloating: | ||||||
11758 | case CK_FloatingCast: | ||||||
11759 | case CK_CPointerToObjCPointerCast: | ||||||
11760 | case CK_BlockPointerToObjCPointerCast: | ||||||
11761 | case CK_AnyPointerToBlockPointerCast: | ||||||
11762 | case CK_ObjCObjectLValueCast: | ||||||
11763 | case CK_FloatingRealToComplex: | ||||||
11764 | case CK_FloatingComplexToReal: | ||||||
11765 | case CK_FloatingComplexCast: | ||||||
11766 | case CK_FloatingComplexToIntegralComplex: | ||||||
11767 | case CK_IntegralRealToComplex: | ||||||
11768 | case CK_IntegralComplexCast: | ||||||
11769 | case CK_IntegralComplexToFloatingComplex: | ||||||
11770 | case CK_BuiltinFnToFnPtr: | ||||||
11771 | case CK_ZeroToOCLOpaqueType: | ||||||
11772 | case CK_NonAtomicToAtomic: | ||||||
11773 | case CK_AddressSpaceConversion: | ||||||
11774 | case CK_IntToOCLSampler: | ||||||
11775 | case CK_FixedPointCast: | ||||||
11776 | case CK_IntegralToFixedPoint: | ||||||
11777 | llvm_unreachable("invalid cast kind for integral value")::llvm::llvm_unreachable_internal("invalid cast kind for integral value" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11777); | ||||||
11778 | |||||||
11779 | case CK_BitCast: | ||||||
11780 | case CK_Dependent: | ||||||
11781 | case CK_LValueBitCast: | ||||||
11782 | case CK_ARCProduceObject: | ||||||
11783 | case CK_ARCConsumeObject: | ||||||
11784 | case CK_ARCReclaimReturnedObject: | ||||||
11785 | case CK_ARCExtendBlockObject: | ||||||
11786 | case CK_CopyAndAutoreleaseBlockObject: | ||||||
11787 | return Error(E); | ||||||
11788 | |||||||
11789 | case CK_UserDefinedConversion: | ||||||
11790 | case CK_LValueToRValue: | ||||||
11791 | case CK_AtomicToNonAtomic: | ||||||
11792 | case CK_NoOp: | ||||||
11793 | case CK_LValueToRValueBitCast: | ||||||
11794 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
11795 | |||||||
11796 | case CK_MemberPointerToBoolean: | ||||||
11797 | case CK_PointerToBoolean: | ||||||
11798 | case CK_IntegralToBoolean: | ||||||
11799 | case CK_FloatingToBoolean: | ||||||
11800 | case CK_BooleanToSignedIntegral: | ||||||
11801 | case CK_FloatingComplexToBoolean: | ||||||
11802 | case CK_IntegralComplexToBoolean: { | ||||||
11803 | bool BoolResult; | ||||||
11804 | if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) | ||||||
11805 | return false; | ||||||
11806 | uint64_t IntResult = BoolResult; | ||||||
11807 | if (BoolResult && E->getCastKind() == CK_BooleanToSignedIntegral) | ||||||
11808 | IntResult = (uint64_t)-1; | ||||||
11809 | return Success(IntResult, E); | ||||||
11810 | } | ||||||
11811 | |||||||
11812 | case CK_FixedPointToIntegral: { | ||||||
11813 | APFixedPoint Src(Info.Ctx.getFixedPointSemantics(SrcType)); | ||||||
11814 | if (!EvaluateFixedPoint(SubExpr, Src, Info)) | ||||||
11815 | return false; | ||||||
11816 | bool Overflowed; | ||||||
11817 | llvm::APSInt Result = Src.convertToInt( | ||||||
11818 | Info.Ctx.getIntWidth(DestType), | ||||||
11819 | DestType->isSignedIntegerOrEnumerationType(), &Overflowed); | ||||||
11820 | if (Overflowed && !HandleOverflow(Info, E, Result, DestType)) | ||||||
11821 | return false; | ||||||
11822 | return Success(Result, E); | ||||||
11823 | } | ||||||
11824 | |||||||
11825 | case CK_FixedPointToBoolean: { | ||||||
11826 | // Unsigned padding does not affect this. | ||||||
11827 | APValue Val; | ||||||
11828 | if (!Evaluate(Val, Info, SubExpr)) | ||||||
11829 | return false; | ||||||
11830 | return Success(Val.getFixedPoint().getBoolValue(), E); | ||||||
11831 | } | ||||||
11832 | |||||||
11833 | case CK_IntegralCast: { | ||||||
11834 | if (!Visit(SubExpr)) | ||||||
11835 | return false; | ||||||
11836 | |||||||
11837 | if (!Result.isInt()) { | ||||||
11838 | // Allow casts of address-of-label differences if they are no-ops | ||||||
11839 | // or narrowing. (The narrowing case isn't actually guaranteed to | ||||||
11840 | // be constant-evaluatable except in some narrow cases which are hard | ||||||
11841 | // to detect here. We let it through on the assumption the user knows | ||||||
11842 | // what they are doing.) | ||||||
11843 | if (Result.isAddrLabelDiff()) | ||||||
11844 | return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); | ||||||
11845 | // Only allow casts of lvalues if they are lossless. | ||||||
11846 | return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); | ||||||
11847 | } | ||||||
11848 | |||||||
11849 | return Success(HandleIntToIntCast(Info, E, DestType, SrcType, | ||||||
11850 | Result.getInt()), E); | ||||||
11851 | } | ||||||
11852 | |||||||
11853 | case CK_PointerToIntegral: { | ||||||
11854 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; | ||||||
11855 | |||||||
11856 | LValue LV; | ||||||
11857 | if (!EvaluatePointer(SubExpr, LV, Info)) | ||||||
11858 | return false; | ||||||
11859 | |||||||
11860 | if (LV.getLValueBase()) { | ||||||
11861 | // Only allow based lvalue casts if they are lossless. | ||||||
11862 | // FIXME: Allow a larger integer size than the pointer size, and allow | ||||||
11863 | // narrowing back down to pointer width in subsequent integral casts. | ||||||
11864 | // FIXME: Check integer type's active bits, not its type size. | ||||||
11865 | if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) | ||||||
11866 | return Error(E); | ||||||
11867 | |||||||
11868 | LV.Designator.setInvalid(); | ||||||
11869 | LV.moveInto(Result); | ||||||
11870 | return true; | ||||||
11871 | } | ||||||
11872 | |||||||
11873 | APSInt AsInt; | ||||||
11874 | APValue V; | ||||||
11875 | LV.moveInto(V); | ||||||
11876 | if (!V.toIntegralConstant(AsInt, SrcType, Info.Ctx)) | ||||||
11877 | llvm_unreachable("Can't cast this!")::llvm::llvm_unreachable_internal("Can't cast this!", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11877); | ||||||
11878 | |||||||
11879 | return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); | ||||||
11880 | } | ||||||
11881 | |||||||
11882 | case CK_IntegralComplexToReal: { | ||||||
11883 | ComplexValue C; | ||||||
11884 | if (!EvaluateComplex(SubExpr, C, Info)) | ||||||
11885 | return false; | ||||||
11886 | return Success(C.getComplexIntReal(), E); | ||||||
11887 | } | ||||||
11888 | |||||||
11889 | case CK_FloatingToIntegral: { | ||||||
11890 | APFloat F(0.0); | ||||||
11891 | if (!EvaluateFloat(SubExpr, F, Info)) | ||||||
11892 | return false; | ||||||
11893 | |||||||
11894 | APSInt Value; | ||||||
11895 | if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) | ||||||
11896 | return false; | ||||||
11897 | return Success(Value, E); | ||||||
11898 | } | ||||||
11899 | } | ||||||
11900 | |||||||
11901 | llvm_unreachable("unknown cast resulting in integral value")::llvm::llvm_unreachable_internal("unknown cast resulting in integral value" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11901); | ||||||
11902 | } | ||||||
11903 | |||||||
11904 | bool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { | ||||||
11905 | if (E->getSubExpr()->getType()->isAnyComplexType()) { | ||||||
11906 | ComplexValue LV; | ||||||
11907 | if (!EvaluateComplex(E->getSubExpr(), LV, Info)) | ||||||
11908 | return false; | ||||||
11909 | if (!LV.isComplexInt()) | ||||||
11910 | return Error(E); | ||||||
11911 | return Success(LV.getComplexIntReal(), E); | ||||||
11912 | } | ||||||
11913 | |||||||
11914 | return Visit(E->getSubExpr()); | ||||||
11915 | } | ||||||
11916 | |||||||
11917 | bool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { | ||||||
11918 | if (E->getSubExpr()->getType()->isComplexIntegerType()) { | ||||||
11919 | ComplexValue LV; | ||||||
11920 | if (!EvaluateComplex(E->getSubExpr(), LV, Info)) | ||||||
11921 | return false; | ||||||
11922 | if (!LV.isComplexInt()) | ||||||
11923 | return Error(E); | ||||||
11924 | return Success(LV.getComplexIntImag(), E); | ||||||
11925 | } | ||||||
11926 | |||||||
11927 | VisitIgnoredValue(E->getSubExpr()); | ||||||
11928 | return Success(0, E); | ||||||
11929 | } | ||||||
11930 | |||||||
11931 | bool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { | ||||||
11932 | return Success(E->getPackLength(), E); | ||||||
11933 | } | ||||||
11934 | |||||||
11935 | bool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { | ||||||
11936 | return Success(E->getValue(), E); | ||||||
11937 | } | ||||||
11938 | |||||||
11939 | bool FixedPointExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { | ||||||
11940 | switch (E->getOpcode()) { | ||||||
11941 | default: | ||||||
11942 | // Invalid unary operators | ||||||
11943 | return Error(E); | ||||||
11944 | case UO_Plus: | ||||||
11945 | // The result is just the value. | ||||||
11946 | return Visit(E->getSubExpr()); | ||||||
11947 | case UO_Minus: { | ||||||
11948 | if (!Visit(E->getSubExpr())) return false; | ||||||
11949 | if (!Result.isFixedPoint()) | ||||||
11950 | return Error(E); | ||||||
11951 | bool Overflowed; | ||||||
11952 | APFixedPoint Negated = Result.getFixedPoint().negate(&Overflowed); | ||||||
11953 | if (Overflowed && !HandleOverflow(Info, E, Negated, E->getType())) | ||||||
11954 | return false; | ||||||
11955 | return Success(Negated, E); | ||||||
11956 | } | ||||||
11957 | case UO_LNot: { | ||||||
11958 | bool bres; | ||||||
11959 | if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) | ||||||
11960 | return false; | ||||||
11961 | return Success(!bres, E); | ||||||
11962 | } | ||||||
11963 | } | ||||||
11964 | } | ||||||
11965 | |||||||
11966 | bool FixedPointExprEvaluator::VisitCastExpr(const CastExpr *E) { | ||||||
11967 | const Expr *SubExpr = E->getSubExpr(); | ||||||
11968 | QualType DestType = E->getType(); | ||||||
11969 | assert(DestType->isFixedPointType() &&((DestType->isFixedPointType() && "Expected destination type to be a fixed point type" ) ? static_cast<void> (0) : __assert_fail ("DestType->isFixedPointType() && \"Expected destination type to be a fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11970, __PRETTY_FUNCTION__)) | ||||||
11970 | "Expected destination type to be a fixed point type")((DestType->isFixedPointType() && "Expected destination type to be a fixed point type" ) ? static_cast<void> (0) : __assert_fail ("DestType->isFixedPointType() && \"Expected destination type to be a fixed point type\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 11970, __PRETTY_FUNCTION__)); | ||||||
11971 | auto DestFXSema = Info.Ctx.getFixedPointSemantics(DestType); | ||||||
11972 | |||||||
11973 | switch (E->getCastKind()) { | ||||||
11974 | case CK_FixedPointCast: { | ||||||
11975 | APFixedPoint Src(Info.Ctx.getFixedPointSemantics(SubExpr->getType())); | ||||||
11976 | if (!EvaluateFixedPoint(SubExpr, Src, Info)) | ||||||
11977 | return false; | ||||||
11978 | bool Overflowed; | ||||||
11979 | APFixedPoint Result = Src.convert(DestFXSema, &Overflowed); | ||||||
11980 | if (Overflowed && !HandleOverflow(Info, E, Result, DestType)) | ||||||
11981 | return false; | ||||||
11982 | return Success(Result, E); | ||||||
11983 | } | ||||||
11984 | case CK_IntegralToFixedPoint: { | ||||||
11985 | APSInt Src; | ||||||
11986 | if (!EvaluateInteger(SubExpr, Src, Info)) | ||||||
11987 | return false; | ||||||
11988 | |||||||
11989 | bool Overflowed; | ||||||
11990 | APFixedPoint IntResult = APFixedPoint::getFromIntValue( | ||||||
11991 | Src, Info.Ctx.getFixedPointSemantics(DestType), &Overflowed); | ||||||
11992 | |||||||
11993 | if (Overflowed && !HandleOverflow(Info, E, IntResult, DestType)) | ||||||
11994 | return false; | ||||||
11995 | |||||||
11996 | return Success(IntResult, E); | ||||||
11997 | } | ||||||
11998 | case CK_NoOp: | ||||||
11999 | case CK_LValueToRValue: | ||||||
12000 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
12001 | default: | ||||||
12002 | return Error(E); | ||||||
12003 | } | ||||||
12004 | } | ||||||
12005 | |||||||
12006 | bool FixedPointExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | ||||||
12007 | const Expr *LHS = E->getLHS(); | ||||||
12008 | const Expr *RHS = E->getRHS(); | ||||||
12009 | FixedPointSemantics ResultFXSema = | ||||||
12010 | Info.Ctx.getFixedPointSemantics(E->getType()); | ||||||
12011 | |||||||
12012 | APFixedPoint LHSFX(Info.Ctx.getFixedPointSemantics(LHS->getType())); | ||||||
12013 | if (!EvaluateFixedPointOrInteger(LHS, LHSFX, Info)) | ||||||
12014 | return false; | ||||||
12015 | APFixedPoint RHSFX(Info.Ctx.getFixedPointSemantics(RHS->getType())); | ||||||
12016 | if (!EvaluateFixedPointOrInteger(RHS, RHSFX, Info)) | ||||||
12017 | return false; | ||||||
12018 | |||||||
12019 | switch (E->getOpcode()) { | ||||||
12020 | case BO_Add: { | ||||||
12021 | bool AddOverflow, ConversionOverflow; | ||||||
12022 | APFixedPoint Result = LHSFX.add(RHSFX, &AddOverflow) | ||||||
12023 | .convert(ResultFXSema, &ConversionOverflow); | ||||||
12024 | if ((AddOverflow || ConversionOverflow) && | ||||||
12025 | !HandleOverflow(Info, E, Result, E->getType())) | ||||||
12026 | return false; | ||||||
12027 | return Success(Result, E); | ||||||
12028 | } | ||||||
12029 | default: | ||||||
12030 | return false; | ||||||
12031 | } | ||||||
12032 | llvm_unreachable("Should've exited before this")::llvm::llvm_unreachable_internal("Should've exited before this" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12032); | ||||||
12033 | } | ||||||
12034 | |||||||
12035 | //===----------------------------------------------------------------------===// | ||||||
12036 | // Float Evaluation | ||||||
12037 | //===----------------------------------------------------------------------===// | ||||||
12038 | |||||||
12039 | namespace { | ||||||
12040 | class FloatExprEvaluator | ||||||
12041 | : public ExprEvaluatorBase<FloatExprEvaluator> { | ||||||
12042 | APFloat &Result; | ||||||
12043 | public: | ||||||
12044 | FloatExprEvaluator(EvalInfo &info, APFloat &result) | ||||||
12045 | : ExprEvaluatorBaseTy(info), Result(result) {} | ||||||
12046 | |||||||
12047 | bool Success(const APValue &V, const Expr *e) { | ||||||
12048 | Result = V.getFloat(); | ||||||
12049 | return true; | ||||||
12050 | } | ||||||
12051 | |||||||
12052 | bool ZeroInitialization(const Expr *E) { | ||||||
12053 | Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); | ||||||
12054 | return true; | ||||||
12055 | } | ||||||
12056 | |||||||
12057 | bool VisitCallExpr(const CallExpr *E); | ||||||
12058 | |||||||
12059 | bool VisitUnaryOperator(const UnaryOperator *E); | ||||||
12060 | bool VisitBinaryOperator(const BinaryOperator *E); | ||||||
12061 | bool VisitFloatingLiteral(const FloatingLiteral *E); | ||||||
12062 | bool VisitCastExpr(const CastExpr *E); | ||||||
12063 | |||||||
12064 | bool VisitUnaryReal(const UnaryOperator *E); | ||||||
12065 | bool VisitUnaryImag(const UnaryOperator *E); | ||||||
12066 | |||||||
12067 | // FIXME: Missing: array subscript of vector, member of vector | ||||||
12068 | }; | ||||||
12069 | } // end anonymous namespace | ||||||
12070 | |||||||
12071 | static bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { | ||||||
12072 | assert(E->isRValue() && E->getType()->isRealFloatingType())((E->isRValue() && E->getType()->isRealFloatingType ()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isRealFloatingType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12072, __PRETTY_FUNCTION__)); | ||||||
12073 | return FloatExprEvaluator(Info, Result).Visit(E); | ||||||
12074 | } | ||||||
12075 | |||||||
12076 | static bool TryEvaluateBuiltinNaN(const ASTContext &Context, | ||||||
12077 | QualType ResultTy, | ||||||
12078 | const Expr *Arg, | ||||||
12079 | bool SNaN, | ||||||
12080 | llvm::APFloat &Result) { | ||||||
12081 | const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); | ||||||
12082 | if (!S) return false; | ||||||
12083 | |||||||
12084 | const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); | ||||||
12085 | |||||||
12086 | llvm::APInt fill; | ||||||
12087 | |||||||
12088 | // Treat empty strings as if they were zero. | ||||||
12089 | if (S->getString().empty()) | ||||||
12090 | fill = llvm::APInt(32, 0); | ||||||
12091 | else if (S->getString().getAsInteger(0, fill)) | ||||||
12092 | return false; | ||||||
12093 | |||||||
12094 | if (Context.getTargetInfo().isNan2008()) { | ||||||
12095 | if (SNaN) | ||||||
12096 | Result = llvm::APFloat::getSNaN(Sem, false, &fill); | ||||||
12097 | else | ||||||
12098 | Result = llvm::APFloat::getQNaN(Sem, false, &fill); | ||||||
12099 | } else { | ||||||
12100 | // Prior to IEEE 754-2008, architectures were allowed to choose whether | ||||||
12101 | // the first bit of their significand was set for qNaN or sNaN. MIPS chose | ||||||
12102 | // a different encoding to what became a standard in 2008, and for pre- | ||||||
12103 | // 2008 revisions, MIPS interpreted sNaN-2008 as qNan and qNaN-2008 as | ||||||
12104 | // sNaN. This is now known as "legacy NaN" encoding. | ||||||
12105 | if (SNaN) | ||||||
12106 | Result = llvm::APFloat::getQNaN(Sem, false, &fill); | ||||||
12107 | else | ||||||
12108 | Result = llvm::APFloat::getSNaN(Sem, false, &fill); | ||||||
12109 | } | ||||||
12110 | |||||||
12111 | return true; | ||||||
12112 | } | ||||||
12113 | |||||||
12114 | bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { | ||||||
12115 | switch (E->getBuiltinCallee()) { | ||||||
12116 | default: | ||||||
12117 | return ExprEvaluatorBaseTy::VisitCallExpr(E); | ||||||
12118 | |||||||
12119 | case Builtin::BI__builtin_huge_val: | ||||||
12120 | case Builtin::BI__builtin_huge_valf: | ||||||
12121 | case Builtin::BI__builtin_huge_vall: | ||||||
12122 | case Builtin::BI__builtin_huge_valf128: | ||||||
12123 | case Builtin::BI__builtin_inf: | ||||||
12124 | case Builtin::BI__builtin_inff: | ||||||
12125 | case Builtin::BI__builtin_infl: | ||||||
12126 | case Builtin::BI__builtin_inff128: { | ||||||
12127 | const llvm::fltSemantics &Sem = | ||||||
12128 | Info.Ctx.getFloatTypeSemantics(E->getType()); | ||||||
12129 | Result = llvm::APFloat::getInf(Sem); | ||||||
12130 | return true; | ||||||
12131 | } | ||||||
12132 | |||||||
12133 | case Builtin::BI__builtin_nans: | ||||||
12134 | case Builtin::BI__builtin_nansf: | ||||||
12135 | case Builtin::BI__builtin_nansl: | ||||||
12136 | case Builtin::BI__builtin_nansf128: | ||||||
12137 | if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), | ||||||
12138 | true, Result)) | ||||||
12139 | return Error(E); | ||||||
12140 | return true; | ||||||
12141 | |||||||
12142 | case Builtin::BI__builtin_nan: | ||||||
12143 | case Builtin::BI__builtin_nanf: | ||||||
12144 | case Builtin::BI__builtin_nanl: | ||||||
12145 | case Builtin::BI__builtin_nanf128: | ||||||
12146 | // If this is __builtin_nan() turn this into a nan, otherwise we | ||||||
12147 | // can't constant fold it. | ||||||
12148 | if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), | ||||||
12149 | false, Result)) | ||||||
12150 | return Error(E); | ||||||
12151 | return true; | ||||||
12152 | |||||||
12153 | case Builtin::BI__builtin_fabs: | ||||||
12154 | case Builtin::BI__builtin_fabsf: | ||||||
12155 | case Builtin::BI__builtin_fabsl: | ||||||
12156 | case Builtin::BI__builtin_fabsf128: | ||||||
12157 | if (!EvaluateFloat(E->getArg(0), Result, Info)) | ||||||
12158 | return false; | ||||||
12159 | |||||||
12160 | if (Result.isNegative()) | ||||||
12161 | Result.changeSign(); | ||||||
12162 | return true; | ||||||
12163 | |||||||
12164 | // FIXME: Builtin::BI__builtin_powi | ||||||
12165 | // FIXME: Builtin::BI__builtin_powif | ||||||
12166 | // FIXME: Builtin::BI__builtin_powil | ||||||
12167 | |||||||
12168 | case Builtin::BI__builtin_copysign: | ||||||
12169 | case Builtin::BI__builtin_copysignf: | ||||||
12170 | case Builtin::BI__builtin_copysignl: | ||||||
12171 | case Builtin::BI__builtin_copysignf128: { | ||||||
12172 | APFloat RHS(0.); | ||||||
12173 | if (!EvaluateFloat(E->getArg(0), Result, Info) || | ||||||
12174 | !EvaluateFloat(E->getArg(1), RHS, Info)) | ||||||
12175 | return false; | ||||||
12176 | Result.copySign(RHS); | ||||||
12177 | return true; | ||||||
12178 | } | ||||||
12179 | } | ||||||
12180 | } | ||||||
12181 | |||||||
12182 | bool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { | ||||||
12183 | if (E->getSubExpr()->getType()->isAnyComplexType()) { | ||||||
12184 | ComplexValue CV; | ||||||
12185 | if (!EvaluateComplex(E->getSubExpr(), CV, Info)) | ||||||
12186 | return false; | ||||||
12187 | Result = CV.FloatReal; | ||||||
12188 | return true; | ||||||
12189 | } | ||||||
12190 | |||||||
12191 | return Visit(E->getSubExpr()); | ||||||
12192 | } | ||||||
12193 | |||||||
12194 | bool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { | ||||||
12195 | if (E->getSubExpr()->getType()->isAnyComplexType()) { | ||||||
12196 | ComplexValue CV; | ||||||
12197 | if (!EvaluateComplex(E->getSubExpr(), CV, Info)) | ||||||
12198 | return false; | ||||||
12199 | Result = CV.FloatImag; | ||||||
12200 | return true; | ||||||
12201 | } | ||||||
12202 | |||||||
12203 | VisitIgnoredValue(E->getSubExpr()); | ||||||
12204 | const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); | ||||||
12205 | Result = llvm::APFloat::getZero(Sem); | ||||||
12206 | return true; | ||||||
12207 | } | ||||||
12208 | |||||||
12209 | bool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { | ||||||
12210 | switch (E->getOpcode()) { | ||||||
12211 | default: return Error(E); | ||||||
12212 | case UO_Plus: | ||||||
12213 | return EvaluateFloat(E->getSubExpr(), Result, Info); | ||||||
12214 | case UO_Minus: | ||||||
12215 | if (!EvaluateFloat(E->getSubExpr(), Result, Info)) | ||||||
12216 | return false; | ||||||
12217 | Result.changeSign(); | ||||||
12218 | return true; | ||||||
12219 | } | ||||||
12220 | } | ||||||
12221 | |||||||
12222 | bool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | ||||||
12223 | if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) | ||||||
12224 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | ||||||
12225 | |||||||
12226 | APFloat RHS(0.0); | ||||||
12227 | bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); | ||||||
12228 | if (!LHSOK && !Info.noteFailure()) | ||||||
12229 | return false; | ||||||
12230 | return EvaluateFloat(E->getRHS(), RHS, Info) && LHSOK && | ||||||
12231 | handleFloatFloatBinOp(Info, E, Result, E->getOpcode(), RHS); | ||||||
12232 | } | ||||||
12233 | |||||||
12234 | bool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { | ||||||
12235 | Result = E->getValue(); | ||||||
12236 | return true; | ||||||
12237 | } | ||||||
12238 | |||||||
12239 | bool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { | ||||||
12240 | const Expr* SubExpr = E->getSubExpr(); | ||||||
12241 | |||||||
12242 | switch (E->getCastKind()) { | ||||||
12243 | default: | ||||||
12244 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
12245 | |||||||
12246 | case CK_IntegralToFloating: { | ||||||
12247 | APSInt IntResult; | ||||||
12248 | return EvaluateInteger(SubExpr, IntResult, Info) && | ||||||
12249 | HandleIntToFloatCast(Info, E, SubExpr->getType(), IntResult, | ||||||
12250 | E->getType(), Result); | ||||||
12251 | } | ||||||
12252 | |||||||
12253 | case CK_FloatingCast: { | ||||||
12254 | if (!Visit(SubExpr)) | ||||||
12255 | return false; | ||||||
12256 | return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), | ||||||
12257 | Result); | ||||||
12258 | } | ||||||
12259 | |||||||
12260 | case CK_FloatingComplexToReal: { | ||||||
12261 | ComplexValue V; | ||||||
12262 | if (!EvaluateComplex(SubExpr, V, Info)) | ||||||
12263 | return false; | ||||||
12264 | Result = V.getComplexFloatReal(); | ||||||
12265 | return true; | ||||||
12266 | } | ||||||
12267 | } | ||||||
12268 | } | ||||||
12269 | |||||||
12270 | //===----------------------------------------------------------------------===// | ||||||
12271 | // Complex Evaluation (for float and integer) | ||||||
12272 | //===----------------------------------------------------------------------===// | ||||||
12273 | |||||||
12274 | namespace { | ||||||
12275 | class ComplexExprEvaluator | ||||||
12276 | : public ExprEvaluatorBase<ComplexExprEvaluator> { | ||||||
12277 | ComplexValue &Result; | ||||||
12278 | |||||||
12279 | public: | ||||||
12280 | ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) | ||||||
12281 | : ExprEvaluatorBaseTy(info), Result(Result) {} | ||||||
12282 | |||||||
12283 | bool Success(const APValue &V, const Expr *e) { | ||||||
12284 | Result.setFrom(V); | ||||||
12285 | return true; | ||||||
12286 | } | ||||||
12287 | |||||||
12288 | bool ZeroInitialization(const Expr *E); | ||||||
12289 | |||||||
12290 | //===--------------------------------------------------------------------===// | ||||||
12291 | // Visitor Methods | ||||||
12292 | //===--------------------------------------------------------------------===// | ||||||
12293 | |||||||
12294 | bool VisitImaginaryLiteral(const ImaginaryLiteral *E); | ||||||
12295 | bool VisitCastExpr(const CastExpr *E); | ||||||
12296 | bool VisitBinaryOperator(const BinaryOperator *E); | ||||||
12297 | bool VisitUnaryOperator(const UnaryOperator *E); | ||||||
12298 | bool VisitInitListExpr(const InitListExpr *E); | ||||||
12299 | }; | ||||||
12300 | } // end anonymous namespace | ||||||
12301 | |||||||
12302 | static bool EvaluateComplex(const Expr *E, ComplexValue &Result, | ||||||
12303 | EvalInfo &Info) { | ||||||
12304 | assert(E->isRValue() && E->getType()->isAnyComplexType())((E->isRValue() && E->getType()->isAnyComplexType ()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isAnyComplexType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12304, __PRETTY_FUNCTION__)); | ||||||
12305 | return ComplexExprEvaluator(Info, Result).Visit(E); | ||||||
12306 | } | ||||||
12307 | |||||||
12308 | bool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { | ||||||
12309 | QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType(); | ||||||
12310 | if (ElemTy->isRealFloatingType()) { | ||||||
12311 | Result.makeComplexFloat(); | ||||||
12312 | APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); | ||||||
12313 | Result.FloatReal = Zero; | ||||||
12314 | Result.FloatImag = Zero; | ||||||
12315 | } else { | ||||||
12316 | Result.makeComplexInt(); | ||||||
12317 | APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); | ||||||
12318 | Result.IntReal = Zero; | ||||||
12319 | Result.IntImag = Zero; | ||||||
12320 | } | ||||||
12321 | return true; | ||||||
12322 | } | ||||||
12323 | |||||||
12324 | bool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { | ||||||
12325 | const Expr* SubExpr = E->getSubExpr(); | ||||||
12326 | |||||||
12327 | if (SubExpr->getType()->isRealFloatingType()) { | ||||||
12328 | Result.makeComplexFloat(); | ||||||
12329 | APFloat &Imag = Result.FloatImag; | ||||||
12330 | if (!EvaluateFloat(SubExpr, Imag, Info)) | ||||||
12331 | return false; | ||||||
12332 | |||||||
12333 | Result.FloatReal = APFloat(Imag.getSemantics()); | ||||||
12334 | return true; | ||||||
12335 | } else { | ||||||
12336 | assert(SubExpr->getType()->isIntegerType() &&((SubExpr->getType()->isIntegerType() && "Unexpected imaginary literal." ) ? static_cast<void> (0) : __assert_fail ("SubExpr->getType()->isIntegerType() && \"Unexpected imaginary literal.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12337, __PRETTY_FUNCTION__)) | ||||||
12337 | "Unexpected imaginary literal.")((SubExpr->getType()->isIntegerType() && "Unexpected imaginary literal." ) ? static_cast<void> (0) : __assert_fail ("SubExpr->getType()->isIntegerType() && \"Unexpected imaginary literal.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12337, __PRETTY_FUNCTION__)); | ||||||
12338 | |||||||
12339 | Result.makeComplexInt(); | ||||||
12340 | APSInt &Imag = Result.IntImag; | ||||||
12341 | if (!EvaluateInteger(SubExpr, Imag, Info)) | ||||||
12342 | return false; | ||||||
12343 | |||||||
12344 | Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); | ||||||
12345 | return true; | ||||||
12346 | } | ||||||
12347 | } | ||||||
12348 | |||||||
12349 | bool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { | ||||||
12350 | |||||||
12351 | switch (E->getCastKind()) { | ||||||
12352 | case CK_BitCast: | ||||||
12353 | case CK_BaseToDerived: | ||||||
12354 | case CK_DerivedToBase: | ||||||
12355 | case CK_UncheckedDerivedToBase: | ||||||
12356 | case CK_Dynamic: | ||||||
12357 | case CK_ToUnion: | ||||||
12358 | case CK_ArrayToPointerDecay: | ||||||
12359 | case CK_FunctionToPointerDecay: | ||||||
12360 | case CK_NullToPointer: | ||||||
12361 | case CK_NullToMemberPointer: | ||||||
12362 | case CK_BaseToDerivedMemberPointer: | ||||||
12363 | case CK_DerivedToBaseMemberPointer: | ||||||
12364 | case CK_MemberPointerToBoolean: | ||||||
12365 | case CK_ReinterpretMemberPointer: | ||||||
12366 | case CK_ConstructorConversion: | ||||||
12367 | case CK_IntegralToPointer: | ||||||
12368 | case CK_PointerToIntegral: | ||||||
12369 | case CK_PointerToBoolean: | ||||||
12370 | case CK_ToVoid: | ||||||
12371 | case CK_VectorSplat: | ||||||
12372 | case CK_IntegralCast: | ||||||
12373 | case CK_BooleanToSignedIntegral: | ||||||
12374 | case CK_IntegralToBoolean: | ||||||
12375 | case CK_IntegralToFloating: | ||||||
12376 | case CK_FloatingToIntegral: | ||||||
12377 | case CK_FloatingToBoolean: | ||||||
12378 | case CK_FloatingCast: | ||||||
12379 | case CK_CPointerToObjCPointerCast: | ||||||
12380 | case CK_BlockPointerToObjCPointerCast: | ||||||
12381 | case CK_AnyPointerToBlockPointerCast: | ||||||
12382 | case CK_ObjCObjectLValueCast: | ||||||
12383 | case CK_FloatingComplexToReal: | ||||||
12384 | case CK_FloatingComplexToBoolean: | ||||||
12385 | case CK_IntegralComplexToReal: | ||||||
12386 | case CK_IntegralComplexToBoolean: | ||||||
12387 | case CK_ARCProduceObject: | ||||||
12388 | case CK_ARCConsumeObject: | ||||||
12389 | case CK_ARCReclaimReturnedObject: | ||||||
12390 | case CK_ARCExtendBlockObject: | ||||||
12391 | case CK_CopyAndAutoreleaseBlockObject: | ||||||
12392 | case CK_BuiltinFnToFnPtr: | ||||||
12393 | case CK_ZeroToOCLOpaqueType: | ||||||
12394 | case CK_NonAtomicToAtomic: | ||||||
12395 | case CK_AddressSpaceConversion: | ||||||
12396 | case CK_IntToOCLSampler: | ||||||
12397 | case CK_FixedPointCast: | ||||||
12398 | case CK_FixedPointToBoolean: | ||||||
12399 | case CK_FixedPointToIntegral: | ||||||
12400 | case CK_IntegralToFixedPoint: | ||||||
12401 | llvm_unreachable("invalid cast kind for complex value")::llvm::llvm_unreachable_internal("invalid cast kind for complex value" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12401); | ||||||
12402 | |||||||
12403 | case CK_LValueToRValue: | ||||||
12404 | case CK_AtomicToNonAtomic: | ||||||
12405 | case CK_NoOp: | ||||||
12406 | case CK_LValueToRValueBitCast: | ||||||
12407 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
12408 | |||||||
12409 | case CK_Dependent: | ||||||
12410 | case CK_LValueBitCast: | ||||||
12411 | case CK_UserDefinedConversion: | ||||||
12412 | return Error(E); | ||||||
12413 | |||||||
12414 | case CK_FloatingRealToComplex: { | ||||||
12415 | APFloat &Real = Result.FloatReal; | ||||||
12416 | if (!EvaluateFloat(E->getSubExpr(), Real, Info)) | ||||||
12417 | return false; | ||||||
12418 | |||||||
12419 | Result.makeComplexFloat(); | ||||||
12420 | Result.FloatImag = APFloat(Real.getSemantics()); | ||||||
12421 | return true; | ||||||
12422 | } | ||||||
12423 | |||||||
12424 | case CK_FloatingComplexCast: { | ||||||
12425 | if (!Visit(E->getSubExpr())) | ||||||
12426 | return false; | ||||||
12427 | |||||||
12428 | QualType To = E->getType()->getAs<ComplexType>()->getElementType(); | ||||||
12429 | QualType From | ||||||
12430 | = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); | ||||||
12431 | |||||||
12432 | return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && | ||||||
12433 | HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); | ||||||
12434 | } | ||||||
12435 | |||||||
12436 | case CK_FloatingComplexToIntegralComplex: { | ||||||
12437 | if (!Visit(E->getSubExpr())) | ||||||
12438 | return false; | ||||||
12439 | |||||||
12440 | QualType To = E->getType()->getAs<ComplexType>()->getElementType(); | ||||||
12441 | QualType From | ||||||
12442 | = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); | ||||||
12443 | Result.makeComplexInt(); | ||||||
12444 | return HandleFloatToIntCast(Info, E, From, Result.FloatReal, | ||||||
12445 | To, Result.IntReal) && | ||||||
12446 | HandleFloatToIntCast(Info, E, From, Result.FloatImag, | ||||||
12447 | To, Result.IntImag); | ||||||
12448 | } | ||||||
12449 | |||||||
12450 | case CK_IntegralRealToComplex: { | ||||||
12451 | APSInt &Real = Result.IntReal; | ||||||
12452 | if (!EvaluateInteger(E->getSubExpr(), Real, Info)) | ||||||
12453 | return false; | ||||||
12454 | |||||||
12455 | Result.makeComplexInt(); | ||||||
12456 | Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); | ||||||
12457 | return true; | ||||||
12458 | } | ||||||
12459 | |||||||
12460 | case CK_IntegralComplexCast: { | ||||||
12461 | if (!Visit(E->getSubExpr())) | ||||||
12462 | return false; | ||||||
12463 | |||||||
12464 | QualType To = E->getType()->getAs<ComplexType>()->getElementType(); | ||||||
12465 | QualType From | ||||||
12466 | = E->getSubExpr()->getType()->getAs<ComplexType>()->getElementType(); | ||||||
12467 | |||||||
12468 | Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); | ||||||
12469 | Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); | ||||||
12470 | return true; | ||||||
12471 | } | ||||||
12472 | |||||||
12473 | case CK_IntegralComplexToFloatingComplex: { | ||||||
12474 | if (!Visit(E->getSubExpr())) | ||||||
12475 | return false; | ||||||
12476 | |||||||
12477 | QualType To = E->getType()->castAs<ComplexType>()->getElementType(); | ||||||
12478 | QualType From | ||||||
12479 | = E->getSubExpr()->getType()->castAs<ComplexType>()->getElementType(); | ||||||
12480 | Result.makeComplexFloat(); | ||||||
12481 | return HandleIntToFloatCast(Info, E, From, Result.IntReal, | ||||||
12482 | To, Result.FloatReal) && | ||||||
12483 | HandleIntToFloatCast(Info, E, From, Result.IntImag, | ||||||
12484 | To, Result.FloatImag); | ||||||
12485 | } | ||||||
12486 | } | ||||||
12487 | |||||||
12488 | llvm_unreachable("unknown cast resulting in complex value")::llvm::llvm_unreachable_internal("unknown cast resulting in complex value" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12488); | ||||||
12489 | } | ||||||
12490 | |||||||
12491 | bool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | ||||||
12492 | if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) | ||||||
12493 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | ||||||
12494 | |||||||
12495 | // Track whether the LHS or RHS is real at the type system level. When this is | ||||||
12496 | // the case we can simplify our evaluation strategy. | ||||||
12497 | bool LHSReal = false, RHSReal = false; | ||||||
12498 | |||||||
12499 | bool LHSOK; | ||||||
12500 | if (E->getLHS()->getType()->isRealFloatingType()) { | ||||||
12501 | LHSReal = true; | ||||||
12502 | APFloat &Real = Result.FloatReal; | ||||||
12503 | LHSOK = EvaluateFloat(E->getLHS(), Real, Info); | ||||||
12504 | if (LHSOK) { | ||||||
12505 | Result.makeComplexFloat(); | ||||||
12506 | Result.FloatImag = APFloat(Real.getSemantics()); | ||||||
12507 | } | ||||||
12508 | } else { | ||||||
12509 | LHSOK = Visit(E->getLHS()); | ||||||
12510 | } | ||||||
12511 | if (!LHSOK && !Info.noteFailure()) | ||||||
12512 | return false; | ||||||
12513 | |||||||
12514 | ComplexValue RHS; | ||||||
12515 | if (E->getRHS()->getType()->isRealFloatingType()) { | ||||||
12516 | RHSReal = true; | ||||||
12517 | APFloat &Real = RHS.FloatReal; | ||||||
12518 | if (!EvaluateFloat(E->getRHS(), Real, Info) || !LHSOK) | ||||||
12519 | return false; | ||||||
12520 | RHS.makeComplexFloat(); | ||||||
12521 | RHS.FloatImag = APFloat(Real.getSemantics()); | ||||||
12522 | } else if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) | ||||||
12523 | return false; | ||||||
12524 | |||||||
12525 | assert(!(LHSReal && RHSReal) &&((!(LHSReal && RHSReal) && "Cannot have both operands of a complex operation be real." ) ? static_cast<void> (0) : __assert_fail ("!(LHSReal && RHSReal) && \"Cannot have both operands of a complex operation be real.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12526, __PRETTY_FUNCTION__)) | ||||||
12526 | "Cannot have both operands of a complex operation be real.")((!(LHSReal && RHSReal) && "Cannot have both operands of a complex operation be real." ) ? static_cast<void> (0) : __assert_fail ("!(LHSReal && RHSReal) && \"Cannot have both operands of a complex operation be real.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12526, __PRETTY_FUNCTION__)); | ||||||
12527 | switch (E->getOpcode()) { | ||||||
12528 | default: return Error(E); | ||||||
12529 | case BO_Add: | ||||||
12530 | if (Result.isComplexFloat()) { | ||||||
12531 | Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), | ||||||
12532 | APFloat::rmNearestTiesToEven); | ||||||
12533 | if (LHSReal) | ||||||
12534 | Result.getComplexFloatImag() = RHS.getComplexFloatImag(); | ||||||
12535 | else if (!RHSReal) | ||||||
12536 | Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), | ||||||
12537 | APFloat::rmNearestTiesToEven); | ||||||
12538 | } else { | ||||||
12539 | Result.getComplexIntReal() += RHS.getComplexIntReal(); | ||||||
12540 | Result.getComplexIntImag() += RHS.getComplexIntImag(); | ||||||
12541 | } | ||||||
12542 | break; | ||||||
12543 | case BO_Sub: | ||||||
12544 | if (Result.isComplexFloat()) { | ||||||
12545 | Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), | ||||||
12546 | APFloat::rmNearestTiesToEven); | ||||||
12547 | if (LHSReal) { | ||||||
12548 | Result.getComplexFloatImag() = RHS.getComplexFloatImag(); | ||||||
12549 | Result.getComplexFloatImag().changeSign(); | ||||||
12550 | } else if (!RHSReal) { | ||||||
12551 | Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), | ||||||
12552 | APFloat::rmNearestTiesToEven); | ||||||
12553 | } | ||||||
12554 | } else { | ||||||
12555 | Result.getComplexIntReal() -= RHS.getComplexIntReal(); | ||||||
12556 | Result.getComplexIntImag() -= RHS.getComplexIntImag(); | ||||||
12557 | } | ||||||
12558 | break; | ||||||
12559 | case BO_Mul: | ||||||
12560 | if (Result.isComplexFloat()) { | ||||||
12561 | // This is an implementation of complex multiplication according to the | ||||||
12562 | // constraints laid out in C11 Annex G. The implementation uses the | ||||||
12563 | // following naming scheme: | ||||||
12564 | // (a + ib) * (c + id) | ||||||
12565 | ComplexValue LHS = Result; | ||||||
12566 | APFloat &A = LHS.getComplexFloatReal(); | ||||||
12567 | APFloat &B = LHS.getComplexFloatImag(); | ||||||
12568 | APFloat &C = RHS.getComplexFloatReal(); | ||||||
12569 | APFloat &D = RHS.getComplexFloatImag(); | ||||||
12570 | APFloat &ResR = Result.getComplexFloatReal(); | ||||||
12571 | APFloat &ResI = Result.getComplexFloatImag(); | ||||||
12572 | if (LHSReal) { | ||||||
12573 | assert(!RHSReal && "Cannot have two real operands for a complex op!")((!RHSReal && "Cannot have two real operands for a complex op!" ) ? static_cast<void> (0) : __assert_fail ("!RHSReal && \"Cannot have two real operands for a complex op!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12573, __PRETTY_FUNCTION__)); | ||||||
12574 | ResR = A * C; | ||||||
12575 | ResI = A * D; | ||||||
12576 | } else if (RHSReal) { | ||||||
12577 | ResR = C * A; | ||||||
12578 | ResI = C * B; | ||||||
12579 | } else { | ||||||
12580 | // In the fully general case, we need to handle NaNs and infinities | ||||||
12581 | // robustly. | ||||||
12582 | APFloat AC = A * C; | ||||||
12583 | APFloat BD = B * D; | ||||||
12584 | APFloat AD = A * D; | ||||||
12585 | APFloat BC = B * C; | ||||||
12586 | ResR = AC - BD; | ||||||
12587 | ResI = AD + BC; | ||||||
12588 | if (ResR.isNaN() && ResI.isNaN()) { | ||||||
12589 | bool Recalc = false; | ||||||
12590 | if (A.isInfinity() || B.isInfinity()) { | ||||||
12591 | A = APFloat::copySign( | ||||||
12592 | APFloat(A.getSemantics(), A.isInfinity() ? 1 : 0), A); | ||||||
12593 | B = APFloat::copySign( | ||||||
12594 | APFloat(B.getSemantics(), B.isInfinity() ? 1 : 0), B); | ||||||
12595 | if (C.isNaN()) | ||||||
12596 | C = APFloat::copySign(APFloat(C.getSemantics()), C); | ||||||
12597 | if (D.isNaN()) | ||||||
12598 | D = APFloat::copySign(APFloat(D.getSemantics()), D); | ||||||
12599 | Recalc = true; | ||||||
12600 | } | ||||||
12601 | if (C.isInfinity() || D.isInfinity()) { | ||||||
12602 | C = APFloat::copySign( | ||||||
12603 | APFloat(C.getSemantics(), C.isInfinity() ? 1 : 0), C); | ||||||
12604 | D = APFloat::copySign( | ||||||
12605 | APFloat(D.getSemantics(), D.isInfinity() ? 1 : 0), D); | ||||||
12606 | if (A.isNaN()) | ||||||
12607 | A = APFloat::copySign(APFloat(A.getSemantics()), A); | ||||||
12608 | if (B.isNaN()) | ||||||
12609 | B = APFloat::copySign(APFloat(B.getSemantics()), B); | ||||||
12610 | Recalc = true; | ||||||
12611 | } | ||||||
12612 | if (!Recalc && (AC.isInfinity() || BD.isInfinity() || | ||||||
12613 | AD.isInfinity() || BC.isInfinity())) { | ||||||
12614 | if (A.isNaN()) | ||||||
12615 | A = APFloat::copySign(APFloat(A.getSemantics()), A); | ||||||
12616 | if (B.isNaN()) | ||||||
12617 | B = APFloat::copySign(APFloat(B.getSemantics()), B); | ||||||
12618 | if (C.isNaN()) | ||||||
12619 | C = APFloat::copySign(APFloat(C.getSemantics()), C); | ||||||
12620 | if (D.isNaN()) | ||||||
12621 | D = APFloat::copySign(APFloat(D.getSemantics()), D); | ||||||
12622 | Recalc = true; | ||||||
12623 | } | ||||||
12624 | if (Recalc) { | ||||||
12625 | ResR = APFloat::getInf(A.getSemantics()) * (A * C - B * D); | ||||||
12626 | ResI = APFloat::getInf(A.getSemantics()) * (A * D + B * C); | ||||||
12627 | } | ||||||
12628 | } | ||||||
12629 | } | ||||||
12630 | } else { | ||||||
12631 | ComplexValue LHS = Result; | ||||||
12632 | Result.getComplexIntReal() = | ||||||
12633 | (LHS.getComplexIntReal() * RHS.getComplexIntReal() - | ||||||
12634 | LHS.getComplexIntImag() * RHS.getComplexIntImag()); | ||||||
12635 | Result.getComplexIntImag() = | ||||||
12636 | (LHS.getComplexIntReal() * RHS.getComplexIntImag() + | ||||||
12637 | LHS.getComplexIntImag() * RHS.getComplexIntReal()); | ||||||
12638 | } | ||||||
12639 | break; | ||||||
12640 | case BO_Div: | ||||||
12641 | if (Result.isComplexFloat()) { | ||||||
12642 | // This is an implementation of complex division according to the | ||||||
12643 | // constraints laid out in C11 Annex G. The implementation uses the | ||||||
12644 | // following naming scheme: | ||||||
12645 | // (a + ib) / (c + id) | ||||||
12646 | ComplexValue LHS = Result; | ||||||
12647 | APFloat &A = LHS.getComplexFloatReal(); | ||||||
12648 | APFloat &B = LHS.getComplexFloatImag(); | ||||||
12649 | APFloat &C = RHS.getComplexFloatReal(); | ||||||
12650 | APFloat &D = RHS.getComplexFloatImag(); | ||||||
12651 | APFloat &ResR = Result.getComplexFloatReal(); | ||||||
12652 | APFloat &ResI = Result.getComplexFloatImag(); | ||||||
12653 | if (RHSReal) { | ||||||
12654 | ResR = A / C; | ||||||
12655 | ResI = B / C; | ||||||
12656 | } else { | ||||||
12657 | if (LHSReal) { | ||||||
12658 | // No real optimizations we can do here, stub out with zero. | ||||||
12659 | B = APFloat::getZero(A.getSemantics()); | ||||||
12660 | } | ||||||
12661 | int DenomLogB = 0; | ||||||
12662 | APFloat MaxCD = maxnum(abs(C), abs(D)); | ||||||
12663 | if (MaxCD.isFinite()) { | ||||||
12664 | DenomLogB = ilogb(MaxCD); | ||||||
12665 | C = scalbn(C, -DenomLogB, APFloat::rmNearestTiesToEven); | ||||||
12666 | D = scalbn(D, -DenomLogB, APFloat::rmNearestTiesToEven); | ||||||
12667 | } | ||||||
12668 | APFloat Denom = C * C + D * D; | ||||||
12669 | ResR = scalbn((A * C + B * D) / Denom, -DenomLogB, | ||||||
12670 | APFloat::rmNearestTiesToEven); | ||||||
12671 | ResI = scalbn((B * C - A * D) / Denom, -DenomLogB, | ||||||
12672 | APFloat::rmNearestTiesToEven); | ||||||
12673 | if (ResR.isNaN() && ResI.isNaN()) { | ||||||
12674 | if (Denom.isPosZero() && (!A.isNaN() || !B.isNaN())) { | ||||||
12675 | ResR = APFloat::getInf(ResR.getSemantics(), C.isNegative()) * A; | ||||||
12676 | ResI = APFloat::getInf(ResR.getSemantics(), C.isNegative()) * B; | ||||||
12677 | } else if ((A.isInfinity() || B.isInfinity()) && C.isFinite() && | ||||||
12678 | D.isFinite()) { | ||||||
12679 | A = APFloat::copySign( | ||||||
12680 | APFloat(A.getSemantics(), A.isInfinity() ? 1 : 0), A); | ||||||
12681 | B = APFloat::copySign( | ||||||
12682 | APFloat(B.getSemantics(), B.isInfinity() ? 1 : 0), B); | ||||||
12683 | ResR = APFloat::getInf(ResR.getSemantics()) * (A * C + B * D); | ||||||
12684 | ResI = APFloat::getInf(ResI.getSemantics()) * (B * C - A * D); | ||||||
12685 | } else if (MaxCD.isInfinity() && A.isFinite() && B.isFinite()) { | ||||||
12686 | C = APFloat::copySign( | ||||||
12687 | APFloat(C.getSemantics(), C.isInfinity() ? 1 : 0), C); | ||||||
12688 | D = APFloat::copySign( | ||||||
12689 | APFloat(D.getSemantics(), D.isInfinity() ? 1 : 0), D); | ||||||
12690 | ResR = APFloat::getZero(ResR.getSemantics()) * (A * C + B * D); | ||||||
12691 | ResI = APFloat::getZero(ResI.getSemantics()) * (B * C - A * D); | ||||||
12692 | } | ||||||
12693 | } | ||||||
12694 | } | ||||||
12695 | } else { | ||||||
12696 | if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) | ||||||
12697 | return Error(E, diag::note_expr_divide_by_zero); | ||||||
12698 | |||||||
12699 | ComplexValue LHS = Result; | ||||||
12700 | APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + | ||||||
12701 | RHS.getComplexIntImag() * RHS.getComplexIntImag(); | ||||||
12702 | Result.getComplexIntReal() = | ||||||
12703 | (LHS.getComplexIntReal() * RHS.getComplexIntReal() + | ||||||
12704 | LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; | ||||||
12705 | Result.getComplexIntImag() = | ||||||
12706 | (LHS.getComplexIntImag() * RHS.getComplexIntReal() - | ||||||
12707 | LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; | ||||||
12708 | } | ||||||
12709 | break; | ||||||
12710 | } | ||||||
12711 | |||||||
12712 | return true; | ||||||
12713 | } | ||||||
12714 | |||||||
12715 | bool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { | ||||||
12716 | // Get the operand value into 'Result'. | ||||||
12717 | if (!Visit(E->getSubExpr())) | ||||||
12718 | return false; | ||||||
12719 | |||||||
12720 | switch (E->getOpcode()) { | ||||||
12721 | default: | ||||||
12722 | return Error(E); | ||||||
12723 | case UO_Extension: | ||||||
12724 | return true; | ||||||
12725 | case UO_Plus: | ||||||
12726 | // The result is always just the subexpr. | ||||||
12727 | return true; | ||||||
12728 | case UO_Minus: | ||||||
12729 | if (Result.isComplexFloat()) { | ||||||
12730 | Result.getComplexFloatReal().changeSign(); | ||||||
12731 | Result.getComplexFloatImag().changeSign(); | ||||||
12732 | } | ||||||
12733 | else { | ||||||
12734 | Result.getComplexIntReal() = -Result.getComplexIntReal(); | ||||||
12735 | Result.getComplexIntImag() = -Result.getComplexIntImag(); | ||||||
12736 | } | ||||||
12737 | return true; | ||||||
12738 | case UO_Not: | ||||||
12739 | if (Result.isComplexFloat()) | ||||||
12740 | Result.getComplexFloatImag().changeSign(); | ||||||
12741 | else | ||||||
12742 | Result.getComplexIntImag() = -Result.getComplexIntImag(); | ||||||
12743 | return true; | ||||||
12744 | } | ||||||
12745 | } | ||||||
12746 | |||||||
12747 | bool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { | ||||||
12748 | if (E->getNumInits() == 2) { | ||||||
12749 | if (E->getType()->isComplexType()) { | ||||||
12750 | Result.makeComplexFloat(); | ||||||
12751 | if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) | ||||||
12752 | return false; | ||||||
12753 | if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) | ||||||
12754 | return false; | ||||||
12755 | } else { | ||||||
12756 | Result.makeComplexInt(); | ||||||
12757 | if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) | ||||||
12758 | return false; | ||||||
12759 | if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) | ||||||
12760 | return false; | ||||||
12761 | } | ||||||
12762 | return true; | ||||||
12763 | } | ||||||
12764 | return ExprEvaluatorBaseTy::VisitInitListExpr(E); | ||||||
12765 | } | ||||||
12766 | |||||||
12767 | //===----------------------------------------------------------------------===// | ||||||
12768 | // Atomic expression evaluation, essentially just handling the NonAtomicToAtomic | ||||||
12769 | // implicit conversion. | ||||||
12770 | //===----------------------------------------------------------------------===// | ||||||
12771 | |||||||
12772 | namespace { | ||||||
12773 | class AtomicExprEvaluator : | ||||||
12774 | public ExprEvaluatorBase<AtomicExprEvaluator> { | ||||||
12775 | const LValue *This; | ||||||
12776 | APValue &Result; | ||||||
12777 | public: | ||||||
12778 | AtomicExprEvaluator(EvalInfo &Info, const LValue *This, APValue &Result) | ||||||
12779 | : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} | ||||||
12780 | |||||||
12781 | bool Success(const APValue &V, const Expr *E) { | ||||||
12782 | Result = V; | ||||||
12783 | return true; | ||||||
12784 | } | ||||||
12785 | |||||||
12786 | bool ZeroInitialization(const Expr *E) { | ||||||
12787 | ImplicitValueInitExpr VIE( | ||||||
12788 | E->getType()->castAs<AtomicType>()->getValueType()); | ||||||
12789 | // For atomic-qualified class (and array) types in C++, initialize the | ||||||
12790 | // _Atomic-wrapped subobject directly, in-place. | ||||||
12791 | return This ? EvaluateInPlace(Result, Info, *This, &VIE) | ||||||
12792 | : Evaluate(Result, Info, &VIE); | ||||||
12793 | } | ||||||
12794 | |||||||
12795 | bool VisitCastExpr(const CastExpr *E) { | ||||||
12796 | switch (E->getCastKind()) { | ||||||
12797 | default: | ||||||
12798 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
12799 | case CK_NonAtomicToAtomic: | ||||||
12800 | return This ? EvaluateInPlace(Result, Info, *This, E->getSubExpr()) | ||||||
12801 | : Evaluate(Result, Info, E->getSubExpr()); | ||||||
12802 | } | ||||||
12803 | } | ||||||
12804 | }; | ||||||
12805 | } // end anonymous namespace | ||||||
12806 | |||||||
12807 | static bool EvaluateAtomic(const Expr *E, const LValue *This, APValue &Result, | ||||||
12808 | EvalInfo &Info) { | ||||||
12809 | assert(E->isRValue() && E->getType()->isAtomicType())((E->isRValue() && E->getType()->isAtomicType ()) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isAtomicType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12809, __PRETTY_FUNCTION__)); | ||||||
12810 | return AtomicExprEvaluator(Info, This, Result).Visit(E); | ||||||
12811 | } | ||||||
12812 | |||||||
12813 | //===----------------------------------------------------------------------===// | ||||||
12814 | // Void expression evaluation, primarily for a cast to void on the LHS of a | ||||||
12815 | // comma operator | ||||||
12816 | //===----------------------------------------------------------------------===// | ||||||
12817 | |||||||
12818 | namespace { | ||||||
12819 | class VoidExprEvaluator | ||||||
12820 | : public ExprEvaluatorBase<VoidExprEvaluator> { | ||||||
12821 | public: | ||||||
12822 | VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} | ||||||
12823 | |||||||
12824 | bool Success(const APValue &V, const Expr *e) { return true; } | ||||||
12825 | |||||||
12826 | bool ZeroInitialization(const Expr *E) { return true; } | ||||||
12827 | |||||||
12828 | bool VisitCastExpr(const CastExpr *E) { | ||||||
12829 | switch (E->getCastKind()) { | ||||||
12830 | default: | ||||||
12831 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | ||||||
12832 | case CK_ToVoid: | ||||||
12833 | VisitIgnoredValue(E->getSubExpr()); | ||||||
12834 | return true; | ||||||
12835 | } | ||||||
12836 | } | ||||||
12837 | |||||||
12838 | bool VisitCallExpr(const CallExpr *E) { | ||||||
12839 | switch (E->getBuiltinCallee()) { | ||||||
12840 | default: | ||||||
12841 | return ExprEvaluatorBaseTy::VisitCallExpr(E); | ||||||
12842 | case Builtin::BI__assume: | ||||||
12843 | case Builtin::BI__builtin_assume: | ||||||
12844 | // The argument is not evaluated! | ||||||
12845 | return true; | ||||||
12846 | } | ||||||
12847 | } | ||||||
12848 | |||||||
12849 | bool VisitCXXDeleteExpr(const CXXDeleteExpr *E); | ||||||
12850 | }; | ||||||
12851 | } // end anonymous namespace | ||||||
12852 | |||||||
12853 | static bool hasVirtualDestructor(QualType T) { | ||||||
12854 | if (CXXRecordDecl *RD = T->getAsCXXRecordDecl()) | ||||||
12855 | if (CXXDestructorDecl *DD = RD->getDestructor()) | ||||||
12856 | return DD->isVirtual(); | ||||||
12857 | return false; | ||||||
12858 | } | ||||||
12859 | |||||||
12860 | bool VoidExprEvaluator::VisitCXXDeleteExpr(const CXXDeleteExpr *E) { | ||||||
12861 | // We cannot speculatively evaluate a delete expression. | ||||||
12862 | if (Info.SpeculativeEvaluationDepth) | ||||||
12863 | return false; | ||||||
12864 | |||||||
12865 | FunctionDecl *OperatorDelete = E->getOperatorDelete(); | ||||||
12866 | if (!OperatorDelete->isReplaceableGlobalAllocationFunction()) { | ||||||
12867 | Info.FFDiag(E, diag::note_constexpr_new_non_replaceable) | ||||||
12868 | << isa<CXXMethodDecl>(OperatorDelete) << OperatorDelete; | ||||||
12869 | return false; | ||||||
12870 | } | ||||||
12871 | |||||||
12872 | const Expr *Arg = E->getArgument(); | ||||||
12873 | |||||||
12874 | LValue Pointer; | ||||||
12875 | if (!EvaluatePointer(Arg, Pointer, Info)) | ||||||
12876 | return false; | ||||||
12877 | if (Pointer.Designator.Invalid) | ||||||
12878 | return false; | ||||||
12879 | |||||||
12880 | // Deleting a null pointer has no effect. | ||||||
12881 | if (Pointer.isNullPointer()) { | ||||||
12882 | // This is the only case where we need to produce an extension warning: | ||||||
12883 | // the only other way we can succeed is if we find a dynamic allocation, | ||||||
12884 | // and we will have warned when we allocated it in that case. | ||||||
12885 | if (!Info.getLangOpts().CPlusPlus2a) | ||||||
12886 | Info.CCEDiag(E, diag::note_constexpr_new); | ||||||
12887 | return true; | ||||||
12888 | } | ||||||
12889 | |||||||
12890 | auto PointerAsString = [&] { | ||||||
12891 | APValue Printable; | ||||||
12892 | Pointer.moveInto(Printable); | ||||||
12893 | return Printable.getAsString(Info.Ctx, Arg->getType()); | ||||||
12894 | }; | ||||||
12895 | |||||||
12896 | DynamicAllocLValue DA = Pointer.Base.dyn_cast<DynamicAllocLValue>(); | ||||||
12897 | if (!DA) { | ||||||
12898 | Info.FFDiag(E, diag::note_constexpr_delete_not_heap_alloc) | ||||||
12899 | << PointerAsString(); | ||||||
12900 | if (Pointer.Base) | ||||||
12901 | NoteLValueLocation(Info, Pointer.Base); | ||||||
12902 | return false; | ||||||
12903 | } | ||||||
12904 | QualType AllocType = Pointer.Base.getDynamicAllocType(); | ||||||
12905 | |||||||
12906 | Optional<EvalInfo::DynAlloc*> Alloc = Info.lookupDynamicAlloc(DA); | ||||||
12907 | if (!Alloc) { | ||||||
12908 | Info.FFDiag(E, diag::note_constexpr_double_delete); | ||||||
12909 | return false; | ||||||
12910 | } | ||||||
12911 | |||||||
12912 | if (E->isArrayForm() != AllocType->isConstantArrayType()) { | ||||||
12913 | Info.FFDiag(E, diag::note_constexpr_new_delete_mismatch) | ||||||
12914 | << E->isArrayForm() << AllocType; | ||||||
12915 | NoteLValueLocation(Info, Pointer.Base); | ||||||
12916 | return false; | ||||||
12917 | } | ||||||
12918 | |||||||
12919 | bool Subobject = false; | ||||||
12920 | if (E->isArrayForm()) { | ||||||
12921 | Subobject = Pointer.Designator.Entries.size() != 1 || | ||||||
12922 | Pointer.Designator.Entries[0].getAsArrayIndex() != 0; | ||||||
12923 | } else { | ||||||
12924 | Subobject = Pointer.Designator.MostDerivedPathLength != 0 || | ||||||
12925 | Pointer.Designator.isOnePastTheEnd(); | ||||||
12926 | } | ||||||
12927 | if (Subobject) { | ||||||
12928 | Info.FFDiag(E, diag::note_constexpr_delete_subobject) | ||||||
12929 | << PointerAsString() << Pointer.Designator.isOnePastTheEnd(); | ||||||
12930 | return false; | ||||||
12931 | } | ||||||
12932 | |||||||
12933 | // For the non-array case, the designator must be empty if the static type | ||||||
12934 | // does not have a virtual destructor. | ||||||
12935 | if (!E->isArrayForm() && Pointer.Designator.Entries.size() != 0 && | ||||||
12936 | !hasVirtualDestructor(Arg->getType()->getPointeeType())) { | ||||||
12937 | Info.FFDiag(E, diag::note_constexpr_delete_base_nonvirt_dtor) | ||||||
12938 | << Arg->getType()->getPointeeType() << AllocType; | ||||||
12939 | return false; | ||||||
12940 | } | ||||||
12941 | |||||||
12942 | if (!HandleDestruction(Info, E->getExprLoc(), Pointer.getLValueBase(), | ||||||
12943 | (*Alloc)->Value, AllocType)) | ||||||
12944 | return false; | ||||||
12945 | |||||||
12946 | if (!Info.HeapAllocs.erase(DA)) { | ||||||
12947 | // The element was already erased. This means the destructor call also | ||||||
12948 | // deleted the object. | ||||||
12949 | // FIXME: This probably results in undefined behavior before we get this | ||||||
12950 | // far, and should be diagnosed elsewhere first. | ||||||
12951 | Info.FFDiag(E, diag::note_constexpr_double_delete); | ||||||
12952 | return false; | ||||||
12953 | } | ||||||
12954 | |||||||
12955 | return true; | ||||||
12956 | } | ||||||
12957 | |||||||
12958 | static bool EvaluateVoid(const Expr *E, EvalInfo &Info) { | ||||||
12959 | assert(E->isRValue() && E->getType()->isVoidType())((E->isRValue() && E->getType()->isVoidType( )) ? static_cast<void> (0) : __assert_fail ("E->isRValue() && E->getType()->isVoidType()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 12959, __PRETTY_FUNCTION__)); | ||||||
12960 | return VoidExprEvaluator(Info).Visit(E); | ||||||
12961 | } | ||||||
12962 | |||||||
12963 | //===----------------------------------------------------------------------===// | ||||||
12964 | // Top level Expr::EvaluateAsRValue method. | ||||||
12965 | //===----------------------------------------------------------------------===// | ||||||
12966 | |||||||
12967 | static bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E) { | ||||||
12968 | // In C, function designators are not lvalues, but we evaluate them as if they | ||||||
12969 | // are. | ||||||
12970 | QualType T = E->getType(); | ||||||
12971 | if (E->isGLValue() || T->isFunctionType()) { | ||||||
12972 | LValue LV; | ||||||
12973 | if (!EvaluateLValue(E, LV, Info)) | ||||||
12974 | return false; | ||||||
12975 | LV.moveInto(Result); | ||||||
12976 | } else if (T->isVectorType()) { | ||||||
12977 | if (!EvaluateVector(E, Result, Info)) | ||||||
12978 | return false; | ||||||
12979 | } else if (T->isIntegralOrEnumerationType()) { | ||||||
12980 | if (!IntExprEvaluator(Info, Result).Visit(E)) | ||||||
12981 | return false; | ||||||
12982 | } else if (T->hasPointerRepresentation()) { | ||||||
12983 | LValue LV; | ||||||
12984 | if (!EvaluatePointer(E, LV, Info)) | ||||||
12985 | return false; | ||||||
12986 | LV.moveInto(Result); | ||||||
12987 | } else if (T->isRealFloatingType()) { | ||||||
12988 | llvm::APFloat F(0.0); | ||||||
12989 | if (!EvaluateFloat(E, F, Info)) | ||||||
12990 | return false; | ||||||
12991 | Result = APValue(F); | ||||||
12992 | } else if (T->isAnyComplexType()) { | ||||||
12993 | ComplexValue C; | ||||||
12994 | if (!EvaluateComplex(E, C, Info)) | ||||||
12995 | return false; | ||||||
12996 | C.moveInto(Result); | ||||||
12997 | } else if (T->isFixedPointType()) { | ||||||
12998 | if (!FixedPointExprEvaluator(Info, Result).Visit(E)) return false; | ||||||
12999 | } else if (T->isMemberPointerType()) { | ||||||
13000 | MemberPtr P; | ||||||
13001 | if (!EvaluateMemberPointer(E, P, Info)) | ||||||
13002 | return false; | ||||||
13003 | P.moveInto(Result); | ||||||
13004 | return true; | ||||||
13005 | } else if (T->isArrayType()) { | ||||||
13006 | LValue LV; | ||||||
13007 | APValue &Value = | ||||||
13008 | Info.CurrentCall->createTemporary(E, T, false, LV); | ||||||
13009 | if (!EvaluateArray(E, LV, Value, Info)) | ||||||
13010 | return false; | ||||||
13011 | Result = Value; | ||||||
13012 | } else if (T->isRecordType()) { | ||||||
13013 | LValue LV; | ||||||
13014 | APValue &Value = Info.CurrentCall->createTemporary(E, T, false, LV); | ||||||
13015 | if (!EvaluateRecord(E, LV, Value, Info)) | ||||||
13016 | return false; | ||||||
13017 | Result = Value; | ||||||
13018 | } else if (T->isVoidType()) { | ||||||
13019 | if (!Info.getLangOpts().CPlusPlus11) | ||||||
13020 | Info.CCEDiag(E, diag::note_constexpr_nonliteral) | ||||||
13021 | << E->getType(); | ||||||
13022 | if (!EvaluateVoid(E, Info)) | ||||||
13023 | return false; | ||||||
13024 | } else if (T->isAtomicType()) { | ||||||
13025 | QualType Unqual = T.getAtomicUnqualifiedType(); | ||||||
13026 | if (Unqual->isArrayType() || Unqual->isRecordType()) { | ||||||
13027 | LValue LV; | ||||||
13028 | APValue &Value = Info.CurrentCall->createTemporary(E, Unqual, false, LV); | ||||||
13029 | if (!EvaluateAtomic(E, &LV, Value, Info)) | ||||||
13030 | return false; | ||||||
13031 | } else { | ||||||
13032 | if (!EvaluateAtomic(E, nullptr, Result, Info)) | ||||||
13033 | return false; | ||||||
13034 | } | ||||||
13035 | } else if (Info.getLangOpts().CPlusPlus11) { | ||||||
13036 | Info.FFDiag(E, diag::note_constexpr_nonliteral) << E->getType(); | ||||||
13037 | return false; | ||||||
13038 | } else { | ||||||
13039 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | ||||||
13040 | return false; | ||||||
13041 | } | ||||||
13042 | |||||||
13043 | return true; | ||||||
13044 | } | ||||||
13045 | |||||||
13046 | /// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some | ||||||
13047 | /// cases, the in-place evaluation is essential, since later initializers for | ||||||
13048 | /// an object can indirectly refer to subobjects which were initialized earlier. | ||||||
13049 | static bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, | ||||||
13050 | const Expr *E, bool AllowNonLiteralTypes) { | ||||||
13051 | assert(!E->isValueDependent())((!E->isValueDependent()) ? static_cast<void> (0) : __assert_fail ("!E->isValueDependent()", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13051, __PRETTY_FUNCTION__)); | ||||||
13052 | |||||||
13053 | if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E, &This)) | ||||||
13054 | return false; | ||||||
13055 | |||||||
13056 | if (E->isRValue()) { | ||||||
13057 | // Evaluate arrays and record types in-place, so that later initializers can | ||||||
13058 | // refer to earlier-initialized members of the object. | ||||||
13059 | QualType T = E->getType(); | ||||||
13060 | if (T->isArrayType()) | ||||||
13061 | return EvaluateArray(E, This, Result, Info); | ||||||
13062 | else if (T->isRecordType()) | ||||||
13063 | return EvaluateRecord(E, This, Result, Info); | ||||||
13064 | else if (T->isAtomicType()) { | ||||||
13065 | QualType Unqual = T.getAtomicUnqualifiedType(); | ||||||
13066 | if (Unqual->isArrayType() || Unqual->isRecordType()) | ||||||
13067 | return EvaluateAtomic(E, &This, Result, Info); | ||||||
13068 | } | ||||||
13069 | } | ||||||
13070 | |||||||
13071 | // For any other type, in-place evaluation is unimportant. | ||||||
13072 | return Evaluate(Result, Info, E); | ||||||
13073 | } | ||||||
13074 | |||||||
13075 | /// EvaluateAsRValue - Try to evaluate this expression, performing an implicit | ||||||
13076 | /// lvalue-to-rvalue cast if it is an lvalue. | ||||||
13077 | static bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { | ||||||
13078 | if (Info.EnableNewConstInterp) { | ||||||
13079 | auto &InterpCtx = Info.Ctx.getInterpContext(); | ||||||
13080 | switch (InterpCtx.evaluateAsRValue(Info, E, Result)) { | ||||||
13081 | case interp::InterpResult::Success: | ||||||
13082 | return true; | ||||||
13083 | case interp::InterpResult::Fail: | ||||||
13084 | return false; | ||||||
13085 | case interp::InterpResult::Bail: | ||||||
13086 | break; | ||||||
13087 | } | ||||||
13088 | } | ||||||
13089 | |||||||
13090 | if (E->getType().isNull()) | ||||||
13091 | return false; | ||||||
13092 | |||||||
13093 | if (!CheckLiteralType(Info, E)) | ||||||
13094 | return false; | ||||||
13095 | |||||||
13096 | if (!::Evaluate(Result, Info, E)) | ||||||
13097 | return false; | ||||||
13098 | |||||||
13099 | if (E->isGLValue()) { | ||||||
13100 | LValue LV; | ||||||
13101 | LV.setFrom(Info.Ctx, Result); | ||||||
13102 | if (!handleLValueToRValueConversion(Info, E, E->getType(), LV, Result)) | ||||||
13103 | return false; | ||||||
13104 | } | ||||||
13105 | |||||||
13106 | // Check this core constant expression is a constant expression. | ||||||
13107 | return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result) && | ||||||
13108 | CheckMemoryLeaks(Info); | ||||||
13109 | } | ||||||
13110 | |||||||
13111 | static bool FastEvaluateAsRValue(const Expr *Exp, Expr::EvalResult &Result, | ||||||
13112 | const ASTContext &Ctx, bool &IsConst) { | ||||||
13113 | // Fast-path evaluations of integer literals, since we sometimes see files | ||||||
13114 | // containing vast quantities of these. | ||||||
13115 | if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(Exp)) { | ||||||
13116 | Result.Val = APValue(APSInt(L->getValue(), | ||||||
13117 | L->getType()->isUnsignedIntegerType())); | ||||||
13118 | IsConst = true; | ||||||
13119 | return true; | ||||||
13120 | } | ||||||
13121 | |||||||
13122 | // This case should be rare, but we need to check it before we check on | ||||||
13123 | // the type below. | ||||||
13124 | if (Exp->getType().isNull()) { | ||||||
13125 | IsConst = false; | ||||||
13126 | return true; | ||||||
13127 | } | ||||||
13128 | |||||||
13129 | // FIXME: Evaluating values of large array and record types can cause | ||||||
13130 | // performance problems. Only do so in C++11 for now. | ||||||
13131 | if (Exp->isRValue() && (Exp->getType()->isArrayType() || | ||||||
13132 | Exp->getType()->isRecordType()) && | ||||||
13133 | !Ctx.getLangOpts().CPlusPlus11) { | ||||||
13134 | IsConst = false; | ||||||
13135 | return true; | ||||||
13136 | } | ||||||
13137 | return false; | ||||||
13138 | } | ||||||
13139 | |||||||
13140 | static bool hasUnacceptableSideEffect(Expr::EvalStatus &Result, | ||||||
13141 | Expr::SideEffectsKind SEK) { | ||||||
13142 | return (SEK < Expr::SE_AllowSideEffects && Result.HasSideEffects) || | ||||||
13143 | (SEK < Expr::SE_AllowUndefinedBehavior && Result.HasUndefinedBehavior); | ||||||
13144 | } | ||||||
13145 | |||||||
13146 | static bool EvaluateAsRValue(const Expr *E, Expr::EvalResult &Result, | ||||||
13147 | const ASTContext &Ctx, EvalInfo &Info) { | ||||||
13148 | bool IsConst; | ||||||
13149 | if (FastEvaluateAsRValue(E, Result, Ctx, IsConst)) | ||||||
13150 | return IsConst; | ||||||
13151 | |||||||
13152 | return EvaluateAsRValue(Info, E, Result.Val); | ||||||
13153 | } | ||||||
13154 | |||||||
13155 | static bool EvaluateAsInt(const Expr *E, Expr::EvalResult &ExprResult, | ||||||
13156 | const ASTContext &Ctx, | ||||||
13157 | Expr::SideEffectsKind AllowSideEffects, | ||||||
13158 | EvalInfo &Info) { | ||||||
13159 | if (!E->getType()->isIntegralOrEnumerationType()) | ||||||
13160 | return false; | ||||||
13161 | |||||||
13162 | if (!::EvaluateAsRValue(E, ExprResult, Ctx, Info) || | ||||||
13163 | !ExprResult.Val.isInt() || | ||||||
13164 | hasUnacceptableSideEffect(ExprResult, AllowSideEffects)) | ||||||
13165 | return false; | ||||||
13166 | |||||||
13167 | return true; | ||||||
13168 | } | ||||||
13169 | |||||||
13170 | static bool EvaluateAsFixedPoint(const Expr *E, Expr::EvalResult &ExprResult, | ||||||
13171 | const ASTContext &Ctx, | ||||||
13172 | Expr::SideEffectsKind AllowSideEffects, | ||||||
13173 | EvalInfo &Info) { | ||||||
13174 | if (!E->getType()->isFixedPointType()) | ||||||
13175 | return false; | ||||||
13176 | |||||||
13177 | if (!::EvaluateAsRValue(E, ExprResult, Ctx, Info)) | ||||||
13178 | return false; | ||||||
13179 | |||||||
13180 | if (!ExprResult.Val.isFixedPoint() || | ||||||
13181 | hasUnacceptableSideEffect(ExprResult, AllowSideEffects)) | ||||||
13182 | return false; | ||||||
13183 | |||||||
13184 | return true; | ||||||
13185 | } | ||||||
13186 | |||||||
13187 | /// EvaluateAsRValue - Return true if this is a constant which we can fold using | ||||||
13188 | /// any crazy technique (that has nothing to do with language standards) that | ||||||
13189 | /// we want to. If this function returns true, it returns the folded constant | ||||||
13190 | /// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion | ||||||
13191 | /// will be applied to the result. | ||||||
13192 | bool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx, | ||||||
13193 | bool InConstantContext) const { | ||||||
13194 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13195, __PRETTY_FUNCTION__)) | ||||||
13195 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13195, __PRETTY_FUNCTION__)); | ||||||
13196 | EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects); | ||||||
13197 | Info.InConstantContext = InConstantContext; | ||||||
13198 | return ::EvaluateAsRValue(this, Result, Ctx, Info); | ||||||
13199 | } | ||||||
13200 | |||||||
13201 | bool Expr::EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx, | ||||||
13202 | bool InConstantContext) const { | ||||||
13203 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13204, __PRETTY_FUNCTION__)) | ||||||
13204 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13204, __PRETTY_FUNCTION__)); | ||||||
13205 | EvalResult Scratch; | ||||||
13206 | return EvaluateAsRValue(Scratch, Ctx, InConstantContext) && | ||||||
13207 | HandleConversionToBool(Scratch.Val, Result); | ||||||
13208 | } | ||||||
13209 | |||||||
13210 | bool Expr::EvaluateAsInt(EvalResult &Result, const ASTContext &Ctx, | ||||||
13211 | SideEffectsKind AllowSideEffects, | ||||||
13212 | bool InConstantContext) const { | ||||||
13213 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13214, __PRETTY_FUNCTION__)) | ||||||
13214 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13214, __PRETTY_FUNCTION__)); | ||||||
13215 | EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects); | ||||||
13216 | Info.InConstantContext = InConstantContext; | ||||||
13217 | return ::EvaluateAsInt(this, Result, Ctx, AllowSideEffects, Info); | ||||||
13218 | } | ||||||
13219 | |||||||
13220 | bool Expr::EvaluateAsFixedPoint(EvalResult &Result, const ASTContext &Ctx, | ||||||
13221 | SideEffectsKind AllowSideEffects, | ||||||
13222 | bool InConstantContext) const { | ||||||
13223 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13224, __PRETTY_FUNCTION__)) | ||||||
13224 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13224, __PRETTY_FUNCTION__)); | ||||||
13225 | EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects); | ||||||
13226 | Info.InConstantContext = InConstantContext; | ||||||
13227 | return ::EvaluateAsFixedPoint(this, Result, Ctx, AllowSideEffects, Info); | ||||||
13228 | } | ||||||
13229 | |||||||
13230 | bool Expr::EvaluateAsFloat(APFloat &Result, const ASTContext &Ctx, | ||||||
13231 | SideEffectsKind AllowSideEffects, | ||||||
13232 | bool InConstantContext) const { | ||||||
13233 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13234, __PRETTY_FUNCTION__)) | ||||||
13234 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13234, __PRETTY_FUNCTION__)); | ||||||
13235 | |||||||
13236 | if (!getType()->isRealFloatingType()) | ||||||
13237 | return false; | ||||||
13238 | |||||||
13239 | EvalResult ExprResult; | ||||||
13240 | if (!EvaluateAsRValue(ExprResult, Ctx, InConstantContext) || | ||||||
13241 | !ExprResult.Val.isFloat() || | ||||||
13242 | hasUnacceptableSideEffect(ExprResult, AllowSideEffects)) | ||||||
13243 | return false; | ||||||
13244 | |||||||
13245 | Result = ExprResult.Val.getFloat(); | ||||||
13246 | return true; | ||||||
13247 | } | ||||||
13248 | |||||||
13249 | bool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx, | ||||||
13250 | bool InConstantContext) const { | ||||||
13251 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13252, __PRETTY_FUNCTION__)) | ||||||
13252 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13252, __PRETTY_FUNCTION__)); | ||||||
13253 | |||||||
13254 | EvalInfo Info(Ctx, Result, EvalInfo::EM_ConstantFold); | ||||||
13255 | Info.InConstantContext = InConstantContext; | ||||||
13256 | LValue LV; | ||||||
13257 | CheckedTemporaries CheckedTemps; | ||||||
13258 | if (!EvaluateLValue(this, LV, Info) || !Info.discardCleanups() || | ||||||
13259 | Result.HasSideEffects || | ||||||
13260 | !CheckLValueConstantExpression(Info, getExprLoc(), | ||||||
13261 | Ctx.getLValueReferenceType(getType()), LV, | ||||||
13262 | Expr::EvaluateForCodeGen, CheckedTemps)) | ||||||
13263 | return false; | ||||||
13264 | |||||||
13265 | LV.moveInto(Result.Val); | ||||||
13266 | return true; | ||||||
13267 | } | ||||||
13268 | |||||||
13269 | bool Expr::EvaluateAsConstantExpr(EvalResult &Result, ConstExprUsage Usage, | ||||||
13270 | const ASTContext &Ctx) const { | ||||||
13271 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13272, __PRETTY_FUNCTION__)) | ||||||
13272 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13272, __PRETTY_FUNCTION__)); | ||||||
13273 | |||||||
13274 | EvalInfo::EvaluationMode EM = EvalInfo::EM_ConstantExpression; | ||||||
13275 | EvalInfo Info(Ctx, Result, EM); | ||||||
13276 | Info.InConstantContext = true; | ||||||
13277 | |||||||
13278 | if (!::Evaluate(Result.Val, Info, this) || Result.HasSideEffects) | ||||||
13279 | return false; | ||||||
13280 | |||||||
13281 | if (!Info.discardCleanups()) | ||||||
13282 | llvm_unreachable("Unhandled cleanup; missing full expression marker?")::llvm::llvm_unreachable_internal("Unhandled cleanup; missing full expression marker?" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13282); | ||||||
13283 | |||||||
13284 | return CheckConstantExpression(Info, getExprLoc(), getType(), Result.Val, | ||||||
13285 | Usage) && | ||||||
13286 | CheckMemoryLeaks(Info); | ||||||
13287 | } | ||||||
13288 | |||||||
13289 | bool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, | ||||||
13290 | const VarDecl *VD, | ||||||
13291 | SmallVectorImpl<PartialDiagnosticAt> &Notes) const { | ||||||
13292 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13293, __PRETTY_FUNCTION__)) | ||||||
13293 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13293, __PRETTY_FUNCTION__)); | ||||||
13294 | |||||||
13295 | // FIXME: Evaluating initializers for large array and record types can cause | ||||||
13296 | // performance problems. Only do so in C++11 for now. | ||||||
13297 | if (isRValue() && (getType()->isArrayType() || getType()->isRecordType()) && | ||||||
13298 | !Ctx.getLangOpts().CPlusPlus11) | ||||||
13299 | return false; | ||||||
13300 | |||||||
13301 | Expr::EvalStatus EStatus; | ||||||
13302 | EStatus.Diag = &Notes; | ||||||
13303 | |||||||
13304 | EvalInfo Info(Ctx, EStatus, VD->isConstexpr() | ||||||
13305 | ? EvalInfo::EM_ConstantExpression | ||||||
13306 | : EvalInfo::EM_ConstantFold); | ||||||
13307 | Info.setEvaluatingDecl(VD, Value); | ||||||
13308 | Info.InConstantContext = true; | ||||||
13309 | |||||||
13310 | SourceLocation DeclLoc = VD->getLocation(); | ||||||
13311 | QualType DeclTy = VD->getType(); | ||||||
13312 | |||||||
13313 | if (Info.EnableNewConstInterp) { | ||||||
13314 | auto &InterpCtx = const_cast<ASTContext &>(Ctx).getInterpContext(); | ||||||
13315 | switch (InterpCtx.evaluateAsInitializer(Info, VD, Value)) { | ||||||
13316 | case interp::InterpResult::Fail: | ||||||
13317 | // Bail out if an error was encountered. | ||||||
13318 | return false; | ||||||
13319 | case interp::InterpResult::Success: | ||||||
13320 | // Evaluation succeeded and value was set. | ||||||
13321 | return CheckConstantExpression(Info, DeclLoc, DeclTy, Value); | ||||||
13322 | case interp::InterpResult::Bail: | ||||||
13323 | // Evaluate the value again for the tree evaluator to use. | ||||||
13324 | break; | ||||||
13325 | } | ||||||
13326 | } | ||||||
13327 | |||||||
13328 | LValue LVal; | ||||||
13329 | LVal.set(VD); | ||||||
13330 | |||||||
13331 | // C++11 [basic.start.init]p2: | ||||||
13332 | // Variables with static storage duration or thread storage duration shall be | ||||||
13333 | // zero-initialized before any other initialization takes place. | ||||||
13334 | // This behavior is not present in C. | ||||||
13335 | if (Ctx.getLangOpts().CPlusPlus && !VD->hasLocalStorage() && | ||||||
13336 | !DeclTy->isReferenceType()) { | ||||||
13337 | ImplicitValueInitExpr VIE(DeclTy); | ||||||
13338 | if (!EvaluateInPlace(Value, Info, LVal, &VIE, | ||||||
13339 | /*AllowNonLiteralTypes=*/true)) | ||||||
13340 | return false; | ||||||
13341 | } | ||||||
13342 | |||||||
13343 | if (!EvaluateInPlace(Value, Info, LVal, this, | ||||||
13344 | /*AllowNonLiteralTypes=*/true) || | ||||||
13345 | EStatus.HasSideEffects) | ||||||
13346 | return false; | ||||||
13347 | |||||||
13348 | // At this point, any lifetime-extended temporaries are completely | ||||||
13349 | // initialized. | ||||||
13350 | Info.performLifetimeExtension(); | ||||||
13351 | |||||||
13352 | if (!Info.discardCleanups()) | ||||||
13353 | llvm_unreachable("Unhandled cleanup; missing full expression marker?")::llvm::llvm_unreachable_internal("Unhandled cleanup; missing full expression marker?" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13353); | ||||||
13354 | |||||||
13355 | return CheckConstantExpression(Info, DeclLoc, DeclTy, Value) && | ||||||
13356 | CheckMemoryLeaks(Info); | ||||||
13357 | } | ||||||
13358 | |||||||
13359 | bool VarDecl::evaluateDestruction( | ||||||
13360 | SmallVectorImpl<PartialDiagnosticAt> &Notes) const { | ||||||
13361 | assert(getEvaluatedValue() && !getEvaluatedValue()->isAbsent() &&((getEvaluatedValue() && !getEvaluatedValue()->isAbsent () && "cannot evaluate destruction of non-constant-initialized variable" ) ? static_cast<void> (0) : __assert_fail ("getEvaluatedValue() && !getEvaluatedValue()->isAbsent() && \"cannot evaluate destruction of non-constant-initialized variable\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13362, __PRETTY_FUNCTION__)) | ||||||
13362 | "cannot evaluate destruction of non-constant-initialized variable")((getEvaluatedValue() && !getEvaluatedValue()->isAbsent () && "cannot evaluate destruction of non-constant-initialized variable" ) ? static_cast<void> (0) : __assert_fail ("getEvaluatedValue() && !getEvaluatedValue()->isAbsent() && \"cannot evaluate destruction of non-constant-initialized variable\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13362, __PRETTY_FUNCTION__)); | ||||||
13363 | |||||||
13364 | Expr::EvalStatus EStatus; | ||||||
13365 | EStatus.Diag = &Notes; | ||||||
13366 | |||||||
13367 | // Make a copy of the value for the destructor to mutate. | ||||||
13368 | APValue DestroyedValue = *getEvaluatedValue(); | ||||||
13369 | |||||||
13370 | EvalInfo Info(getASTContext(), EStatus, EvalInfo::EM_ConstantExpression); | ||||||
13371 | Info.setEvaluatingDecl(this, DestroyedValue, | ||||||
13372 | EvalInfo::EvaluatingDeclKind::Dtor); | ||||||
13373 | Info.InConstantContext = true; | ||||||
13374 | |||||||
13375 | SourceLocation DeclLoc = getLocation(); | ||||||
13376 | QualType DeclTy = getType(); | ||||||
13377 | |||||||
13378 | LValue LVal; | ||||||
13379 | LVal.set(this); | ||||||
13380 | |||||||
13381 | // FIXME: Consider storing whether this variable has constant destruction in | ||||||
13382 | // the EvaluatedStmt so that CodeGen can query it. | ||||||
13383 | if (!HandleDestruction(Info, DeclLoc, LVal.Base, DestroyedValue, DeclTy) || | ||||||
13384 | EStatus.HasSideEffects) | ||||||
13385 | return false; | ||||||
13386 | |||||||
13387 | if (!Info.discardCleanups()) | ||||||
13388 | llvm_unreachable("Unhandled cleanup; missing full expression marker?")::llvm::llvm_unreachable_internal("Unhandled cleanup; missing full expression marker?" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13388); | ||||||
13389 | |||||||
13390 | ensureEvaluatedStmt()->HasConstantDestruction = true; | ||||||
13391 | return true; | ||||||
13392 | } | ||||||
13393 | |||||||
13394 | /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be | ||||||
13395 | /// constant folded, but discard the result. | ||||||
13396 | bool Expr::isEvaluatable(const ASTContext &Ctx, SideEffectsKind SEK) const { | ||||||
13397 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13398, __PRETTY_FUNCTION__)) | ||||||
13398 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13398, __PRETTY_FUNCTION__)); | ||||||
13399 | |||||||
13400 | EvalResult Result; | ||||||
13401 | return EvaluateAsRValue(Result, Ctx, /* in constant context */ true) && | ||||||
13402 | !hasUnacceptableSideEffect(Result, SEK); | ||||||
13403 | } | ||||||
13404 | |||||||
13405 | APSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx, | ||||||
13406 | SmallVectorImpl<PartialDiagnosticAt> *Diag) const { | ||||||
13407 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13408, __PRETTY_FUNCTION__)) | ||||||
13408 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13408, __PRETTY_FUNCTION__)); | ||||||
13409 | |||||||
13410 | EvalResult EVResult; | ||||||
13411 | EVResult.Diag = Diag; | ||||||
13412 | EvalInfo Info(Ctx, EVResult, EvalInfo::EM_IgnoreSideEffects); | ||||||
13413 | Info.InConstantContext = true; | ||||||
13414 | |||||||
13415 | bool Result = ::EvaluateAsRValue(this, EVResult, Ctx, Info); | ||||||
13416 | (void)Result; | ||||||
13417 | assert(Result && "Could not evaluate expression")((Result && "Could not evaluate expression") ? static_cast <void> (0) : __assert_fail ("Result && \"Could not evaluate expression\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13417, __PRETTY_FUNCTION__)); | ||||||
13418 | assert(EVResult.Val.isInt() && "Expression did not evaluate to integer")((EVResult.Val.isInt() && "Expression did not evaluate to integer" ) ? static_cast<void> (0) : __assert_fail ("EVResult.Val.isInt() && \"Expression did not evaluate to integer\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13418, __PRETTY_FUNCTION__)); | ||||||
13419 | |||||||
13420 | return EVResult.Val.getInt(); | ||||||
13421 | } | ||||||
13422 | |||||||
13423 | APSInt Expr::EvaluateKnownConstIntCheckOverflow( | ||||||
13424 | const ASTContext &Ctx, SmallVectorImpl<PartialDiagnosticAt> *Diag) const { | ||||||
13425 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13426, __PRETTY_FUNCTION__)) | ||||||
13426 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13426, __PRETTY_FUNCTION__)); | ||||||
13427 | |||||||
13428 | EvalResult EVResult; | ||||||
13429 | EVResult.Diag = Diag; | ||||||
13430 | EvalInfo Info(Ctx, EVResult, EvalInfo::EM_IgnoreSideEffects); | ||||||
13431 | Info.InConstantContext = true; | ||||||
13432 | Info.CheckingForUndefinedBehavior = true; | ||||||
13433 | |||||||
13434 | bool Result = ::EvaluateAsRValue(Info, this, EVResult.Val); | ||||||
13435 | (void)Result; | ||||||
13436 | assert(Result && "Could not evaluate expression")((Result && "Could not evaluate expression") ? static_cast <void> (0) : __assert_fail ("Result && \"Could not evaluate expression\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13436, __PRETTY_FUNCTION__)); | ||||||
13437 | assert(EVResult.Val.isInt() && "Expression did not evaluate to integer")((EVResult.Val.isInt() && "Expression did not evaluate to integer" ) ? static_cast<void> (0) : __assert_fail ("EVResult.Val.isInt() && \"Expression did not evaluate to integer\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13437, __PRETTY_FUNCTION__)); | ||||||
13438 | |||||||
13439 | return EVResult.Val.getInt(); | ||||||
13440 | } | ||||||
13441 | |||||||
13442 | void Expr::EvaluateForOverflow(const ASTContext &Ctx) const { | ||||||
13443 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13444, __PRETTY_FUNCTION__)) | ||||||
13444 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13444, __PRETTY_FUNCTION__)); | ||||||
13445 | |||||||
13446 | bool IsConst; | ||||||
13447 | EvalResult EVResult; | ||||||
13448 | if (!FastEvaluateAsRValue(this, EVResult, Ctx, IsConst)) { | ||||||
13449 | EvalInfo Info(Ctx, EVResult, EvalInfo::EM_IgnoreSideEffects); | ||||||
13450 | Info.CheckingForUndefinedBehavior = true; | ||||||
13451 | (void)::EvaluateAsRValue(Info, this, EVResult.Val); | ||||||
13452 | } | ||||||
13453 | } | ||||||
13454 | |||||||
13455 | bool Expr::EvalResult::isGlobalLValue() const { | ||||||
13456 | assert(Val.isLValue())((Val.isLValue()) ? static_cast<void> (0) : __assert_fail ("Val.isLValue()", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13456, __PRETTY_FUNCTION__)); | ||||||
13457 | return IsGlobalLValue(Val.getLValueBase()); | ||||||
13458 | } | ||||||
13459 | |||||||
13460 | |||||||
13461 | /// isIntegerConstantExpr - this recursive routine will test if an expression is | ||||||
13462 | /// an integer constant expression. | ||||||
13463 | |||||||
13464 | /// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, | ||||||
13465 | /// comma, etc | ||||||
13466 | |||||||
13467 | // CheckICE - This function does the fundamental ICE checking: the returned | ||||||
13468 | // ICEDiag contains an ICEKind indicating whether the expression is an ICE, | ||||||
13469 | // and a (possibly null) SourceLocation indicating the location of the problem. | ||||||
13470 | // | ||||||
13471 | // Note that to reduce code duplication, this helper does no evaluation | ||||||
13472 | // itself; the caller checks whether the expression is evaluatable, and | ||||||
13473 | // in the rare cases where CheckICE actually cares about the evaluated | ||||||
13474 | // value, it calls into Evaluate. | ||||||
13475 | |||||||
13476 | namespace { | ||||||
13477 | |||||||
13478 | enum ICEKind { | ||||||
13479 | /// This expression is an ICE. | ||||||
13480 | IK_ICE, | ||||||
13481 | /// This expression is not an ICE, but if it isn't evaluated, it's | ||||||
13482 | /// a legal subexpression for an ICE. This return value is used to handle | ||||||
13483 | /// the comma operator in C99 mode, and non-constant subexpressions. | ||||||
13484 | IK_ICEIfUnevaluated, | ||||||
13485 | /// This expression is not an ICE, and is not a legal subexpression for one. | ||||||
13486 | IK_NotICE | ||||||
13487 | }; | ||||||
13488 | |||||||
13489 | struct ICEDiag { | ||||||
13490 | ICEKind Kind; | ||||||
13491 | SourceLocation Loc; | ||||||
13492 | |||||||
13493 | ICEDiag(ICEKind IK, SourceLocation l) : Kind(IK), Loc(l) {} | ||||||
13494 | }; | ||||||
13495 | |||||||
13496 | } | ||||||
13497 | |||||||
13498 | static ICEDiag NoDiag() { return ICEDiag(IK_ICE, SourceLocation()); } | ||||||
13499 | |||||||
13500 | static ICEDiag Worst(ICEDiag A, ICEDiag B) { return A.Kind >= B.Kind ? A : B; } | ||||||
13501 | |||||||
13502 | static ICEDiag CheckEvalInICE(const Expr* E, const ASTContext &Ctx) { | ||||||
13503 | Expr::EvalResult EVResult; | ||||||
13504 | Expr::EvalStatus Status; | ||||||
13505 | EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpression); | ||||||
13506 | |||||||
13507 | Info.InConstantContext = true; | ||||||
13508 | if (!::EvaluateAsRValue(E, EVResult, Ctx, Info) || EVResult.HasSideEffects || | ||||||
13509 | !EVResult.Val.isInt()) | ||||||
13510 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13511 | |||||||
13512 | return NoDiag(); | ||||||
13513 | } | ||||||
13514 | |||||||
13515 | static ICEDiag CheckICE(const Expr* E, const ASTContext &Ctx) { | ||||||
13516 | assert(!E->isValueDependent() && "Should not see value dependent exprs!")((!E->isValueDependent() && "Should not see value dependent exprs!" ) ? static_cast<void> (0) : __assert_fail ("!E->isValueDependent() && \"Should not see value dependent exprs!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13516, __PRETTY_FUNCTION__)); | ||||||
13517 | if (!E->getType()->isIntegralOrEnumerationType()) | ||||||
13518 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13519 | |||||||
13520 | switch (E->getStmtClass()) { | ||||||
13521 | #define ABSTRACT_STMT(Node) | ||||||
13522 | #define STMT(Node, Base) case Expr::Node##Class: | ||||||
13523 | #define EXPR(Node, Base) | ||||||
13524 | #include "clang/AST/StmtNodes.inc" | ||||||
13525 | case Expr::PredefinedExprClass: | ||||||
13526 | case Expr::FloatingLiteralClass: | ||||||
13527 | case Expr::ImaginaryLiteralClass: | ||||||
13528 | case Expr::StringLiteralClass: | ||||||
13529 | case Expr::ArraySubscriptExprClass: | ||||||
13530 | case Expr::OMPArraySectionExprClass: | ||||||
13531 | case Expr::MemberExprClass: | ||||||
13532 | case Expr::CompoundAssignOperatorClass: | ||||||
13533 | case Expr::CompoundLiteralExprClass: | ||||||
13534 | case Expr::ExtVectorElementExprClass: | ||||||
13535 | case Expr::DesignatedInitExprClass: | ||||||
13536 | case Expr::ArrayInitLoopExprClass: | ||||||
13537 | case Expr::ArrayInitIndexExprClass: | ||||||
13538 | case Expr::NoInitExprClass: | ||||||
13539 | case Expr::DesignatedInitUpdateExprClass: | ||||||
13540 | case Expr::ImplicitValueInitExprClass: | ||||||
13541 | case Expr::ParenListExprClass: | ||||||
13542 | case Expr::VAArgExprClass: | ||||||
13543 | case Expr::AddrLabelExprClass: | ||||||
13544 | case Expr::StmtExprClass: | ||||||
13545 | case Expr::CXXMemberCallExprClass: | ||||||
13546 | case Expr::CUDAKernelCallExprClass: | ||||||
13547 | case Expr::CXXDynamicCastExprClass: | ||||||
13548 | case Expr::CXXTypeidExprClass: | ||||||
13549 | case Expr::CXXUuidofExprClass: | ||||||
13550 | case Expr::MSPropertyRefExprClass: | ||||||
13551 | case Expr::MSPropertySubscriptExprClass: | ||||||
13552 | case Expr::CXXNullPtrLiteralExprClass: | ||||||
13553 | case Expr::UserDefinedLiteralClass: | ||||||
13554 | case Expr::CXXThisExprClass: | ||||||
13555 | case Expr::CXXThrowExprClass: | ||||||
13556 | case Expr::CXXNewExprClass: | ||||||
13557 | case Expr::CXXDeleteExprClass: | ||||||
13558 | case Expr::CXXPseudoDestructorExprClass: | ||||||
13559 | case Expr::UnresolvedLookupExprClass: | ||||||
13560 | case Expr::TypoExprClass: | ||||||
13561 | case Expr::DependentScopeDeclRefExprClass: | ||||||
13562 | case Expr::CXXConstructExprClass: | ||||||
13563 | case Expr::CXXInheritedCtorInitExprClass: | ||||||
13564 | case Expr::CXXStdInitializerListExprClass: | ||||||
13565 | case Expr::CXXBindTemporaryExprClass: | ||||||
13566 | case Expr::ExprWithCleanupsClass: | ||||||
13567 | case Expr::CXXTemporaryObjectExprClass: | ||||||
13568 | case Expr::CXXUnresolvedConstructExprClass: | ||||||
13569 | case Expr::CXXDependentScopeMemberExprClass: | ||||||
13570 | case Expr::UnresolvedMemberExprClass: | ||||||
13571 | case Expr::ObjCStringLiteralClass: | ||||||
13572 | case Expr::ObjCBoxedExprClass: | ||||||
13573 | case Expr::ObjCArrayLiteralClass: | ||||||
13574 | case Expr::ObjCDictionaryLiteralClass: | ||||||
13575 | case Expr::ObjCEncodeExprClass: | ||||||
13576 | case Expr::ObjCMessageExprClass: | ||||||
13577 | case Expr::ObjCSelectorExprClass: | ||||||
13578 | case Expr::ObjCProtocolExprClass: | ||||||
13579 | case Expr::ObjCIvarRefExprClass: | ||||||
13580 | case Expr::ObjCPropertyRefExprClass: | ||||||
13581 | case Expr::ObjCSubscriptRefExprClass: | ||||||
13582 | case Expr::ObjCIsaExprClass: | ||||||
13583 | case Expr::ObjCAvailabilityCheckExprClass: | ||||||
13584 | case Expr::ShuffleVectorExprClass: | ||||||
13585 | case Expr::ConvertVectorExprClass: | ||||||
13586 | case Expr::BlockExprClass: | ||||||
13587 | case Expr::NoStmtClass: | ||||||
13588 | case Expr::OpaqueValueExprClass: | ||||||
13589 | case Expr::PackExpansionExprClass: | ||||||
13590 | case Expr::SubstNonTypeTemplateParmPackExprClass: | ||||||
13591 | case Expr::FunctionParmPackExprClass: | ||||||
13592 | case Expr::AsTypeExprClass: | ||||||
13593 | case Expr::ObjCIndirectCopyRestoreExprClass: | ||||||
13594 | case Expr::MaterializeTemporaryExprClass: | ||||||
13595 | case Expr::PseudoObjectExprClass: | ||||||
13596 | case Expr::AtomicExprClass: | ||||||
13597 | case Expr::LambdaExprClass: | ||||||
13598 | case Expr::CXXFoldExprClass: | ||||||
13599 | case Expr::CoawaitExprClass: | ||||||
13600 | case Expr::DependentCoawaitExprClass: | ||||||
13601 | case Expr::CoyieldExprClass: | ||||||
13602 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13603 | |||||||
13604 | case Expr::InitListExprClass: { | ||||||
13605 | // C++03 [dcl.init]p13: If T is a scalar type, then a declaration of the | ||||||
13606 | // form "T x = { a };" is equivalent to "T x = a;". | ||||||
13607 | // Unless we're initializing a reference, T is a scalar as it is known to be | ||||||
13608 | // of integral or enumeration type. | ||||||
13609 | if (E->isRValue()) | ||||||
13610 | if (cast<InitListExpr>(E)->getNumInits() == 1) | ||||||
13611 | return CheckICE(cast<InitListExpr>(E)->getInit(0), Ctx); | ||||||
13612 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13613 | } | ||||||
13614 | |||||||
13615 | case Expr::SizeOfPackExprClass: | ||||||
13616 | case Expr::GNUNullExprClass: | ||||||
13617 | case Expr::SourceLocExprClass: | ||||||
13618 | return NoDiag(); | ||||||
13619 | |||||||
13620 | case Expr::SubstNonTypeTemplateParmExprClass: | ||||||
13621 | return | ||||||
13622 | CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); | ||||||
13623 | |||||||
13624 | case Expr::ConstantExprClass: | ||||||
13625 | return CheckICE(cast<ConstantExpr>(E)->getSubExpr(), Ctx); | ||||||
13626 | |||||||
13627 | case Expr::ParenExprClass: | ||||||
13628 | return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); | ||||||
13629 | case Expr::GenericSelectionExprClass: | ||||||
13630 | return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); | ||||||
13631 | case Expr::IntegerLiteralClass: | ||||||
13632 | case Expr::FixedPointLiteralClass: | ||||||
13633 | case Expr::CharacterLiteralClass: | ||||||
13634 | case Expr::ObjCBoolLiteralExprClass: | ||||||
13635 | case Expr::CXXBoolLiteralExprClass: | ||||||
13636 | case Expr::CXXScalarValueInitExprClass: | ||||||
13637 | case Expr::TypeTraitExprClass: | ||||||
13638 | case Expr::ArrayTypeTraitExprClass: | ||||||
13639 | case Expr::ExpressionTraitExprClass: | ||||||
13640 | case Expr::CXXNoexceptExprClass: | ||||||
13641 | return NoDiag(); | ||||||
13642 | case Expr::CallExprClass: | ||||||
13643 | case Expr::CXXOperatorCallExprClass: { | ||||||
13644 | // C99 6.6/3 allows function calls within unevaluated subexpressions of | ||||||
13645 | // constant expressions, but they can never be ICEs because an ICE cannot | ||||||
13646 | // contain an operand of (pointer to) function type. | ||||||
13647 | const CallExpr *CE = cast<CallExpr>(E); | ||||||
13648 | if (CE->getBuiltinCallee()) | ||||||
13649 | return CheckEvalInICE(E, Ctx); | ||||||
13650 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13651 | } | ||||||
13652 | case Expr::DeclRefExprClass: { | ||||||
13653 | if (isa<EnumConstantDecl>(cast<DeclRefExpr>(E)->getDecl())) | ||||||
13654 | return NoDiag(); | ||||||
13655 | const ValueDecl *D = cast<DeclRefExpr>(E)->getDecl(); | ||||||
13656 | if (Ctx.getLangOpts().CPlusPlus && | ||||||
13657 | D && IsConstNonVolatile(D->getType())) { | ||||||
13658 | // Parameter variables are never constants. Without this check, | ||||||
13659 | // getAnyInitializer() can find a default argument, which leads | ||||||
13660 | // to chaos. | ||||||
13661 | if (isa<ParmVarDecl>(D)) | ||||||
13662 | return ICEDiag(IK_NotICE, cast<DeclRefExpr>(E)->getLocation()); | ||||||
13663 | |||||||
13664 | // C++ 7.1.5.1p2 | ||||||
13665 | // A variable of non-volatile const-qualified integral or enumeration | ||||||
13666 | // type initialized by an ICE can be used in ICEs. | ||||||
13667 | if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) { | ||||||
13668 | if (!Dcl->getType()->isIntegralOrEnumerationType()) | ||||||
13669 | return ICEDiag(IK_NotICE, cast<DeclRefExpr>(E)->getLocation()); | ||||||
13670 | |||||||
13671 | const VarDecl *VD; | ||||||
13672 | // Look for a declaration of this variable that has an initializer, and | ||||||
13673 | // check whether it is an ICE. | ||||||
13674 | if (Dcl->getAnyInitializer(VD) && VD->checkInitIsICE()) | ||||||
13675 | return NoDiag(); | ||||||
13676 | else | ||||||
13677 | return ICEDiag(IK_NotICE, cast<DeclRefExpr>(E)->getLocation()); | ||||||
13678 | } | ||||||
13679 | } | ||||||
13680 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13681 | } | ||||||
13682 | case Expr::UnaryOperatorClass: { | ||||||
13683 | const UnaryOperator *Exp = cast<UnaryOperator>(E); | ||||||
13684 | switch (Exp->getOpcode()) { | ||||||
13685 | case UO_PostInc: | ||||||
13686 | case UO_PostDec: | ||||||
13687 | case UO_PreInc: | ||||||
13688 | case UO_PreDec: | ||||||
13689 | case UO_AddrOf: | ||||||
13690 | case UO_Deref: | ||||||
13691 | case UO_Coawait: | ||||||
13692 | // C99 6.6/3 allows increment and decrement within unevaluated | ||||||
13693 | // subexpressions of constant expressions, but they can never be ICEs | ||||||
13694 | // because an ICE cannot contain an lvalue operand. | ||||||
13695 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13696 | case UO_Extension: | ||||||
13697 | case UO_LNot: | ||||||
13698 | case UO_Plus: | ||||||
13699 | case UO_Minus: | ||||||
13700 | case UO_Not: | ||||||
13701 | case UO_Real: | ||||||
13702 | case UO_Imag: | ||||||
13703 | return CheckICE(Exp->getSubExpr(), Ctx); | ||||||
13704 | } | ||||||
13705 | llvm_unreachable("invalid unary operator class")::llvm::llvm_unreachable_internal("invalid unary operator class" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13705); | ||||||
13706 | } | ||||||
13707 | case Expr::OffsetOfExprClass: { | ||||||
13708 | // Note that per C99, offsetof must be an ICE. And AFAIK, using | ||||||
13709 | // EvaluateAsRValue matches the proposed gcc behavior for cases like | ||||||
13710 | // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect | ||||||
13711 | // compliance: we should warn earlier for offsetof expressions with | ||||||
13712 | // array subscripts that aren't ICEs, and if the array subscripts | ||||||
13713 | // are ICEs, the value of the offsetof must be an integer constant. | ||||||
13714 | return CheckEvalInICE(E, Ctx); | ||||||
13715 | } | ||||||
13716 | case Expr::UnaryExprOrTypeTraitExprClass: { | ||||||
13717 | const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); | ||||||
13718 | if ((Exp->getKind() == UETT_SizeOf) && | ||||||
13719 | Exp->getTypeOfArgument()->isVariableArrayType()) | ||||||
13720 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13721 | return NoDiag(); | ||||||
13722 | } | ||||||
13723 | case Expr::BinaryOperatorClass: { | ||||||
13724 | const BinaryOperator *Exp = cast<BinaryOperator>(E); | ||||||
13725 | switch (Exp->getOpcode()) { | ||||||
13726 | case BO_PtrMemD: | ||||||
13727 | case BO_PtrMemI: | ||||||
13728 | case BO_Assign: | ||||||
13729 | case BO_MulAssign: | ||||||
13730 | case BO_DivAssign: | ||||||
13731 | case BO_RemAssign: | ||||||
13732 | case BO_AddAssign: | ||||||
13733 | case BO_SubAssign: | ||||||
13734 | case BO_ShlAssign: | ||||||
13735 | case BO_ShrAssign: | ||||||
13736 | case BO_AndAssign: | ||||||
13737 | case BO_XorAssign: | ||||||
13738 | case BO_OrAssign: | ||||||
13739 | // C99 6.6/3 allows assignments within unevaluated subexpressions of | ||||||
13740 | // constant expressions, but they can never be ICEs because an ICE cannot | ||||||
13741 | // contain an lvalue operand. | ||||||
13742 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13743 | |||||||
13744 | case BO_Mul: | ||||||
13745 | case BO_Div: | ||||||
13746 | case BO_Rem: | ||||||
13747 | case BO_Add: | ||||||
13748 | case BO_Sub: | ||||||
13749 | case BO_Shl: | ||||||
13750 | case BO_Shr: | ||||||
13751 | case BO_LT: | ||||||
13752 | case BO_GT: | ||||||
13753 | case BO_LE: | ||||||
13754 | case BO_GE: | ||||||
13755 | case BO_EQ: | ||||||
13756 | case BO_NE: | ||||||
13757 | case BO_And: | ||||||
13758 | case BO_Xor: | ||||||
13759 | case BO_Or: | ||||||
13760 | case BO_Comma: | ||||||
13761 | case BO_Cmp: { | ||||||
13762 | ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); | ||||||
13763 | ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); | ||||||
13764 | if (Exp->getOpcode() == BO_Div || | ||||||
13765 | Exp->getOpcode() == BO_Rem) { | ||||||
13766 | // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure | ||||||
13767 | // we don't evaluate one. | ||||||
13768 | if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICE) { | ||||||
13769 | llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); | ||||||
13770 | if (REval == 0) | ||||||
13771 | return ICEDiag(IK_ICEIfUnevaluated, E->getBeginLoc()); | ||||||
13772 | if (REval.isSigned() && REval.isAllOnesValue()) { | ||||||
13773 | llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); | ||||||
13774 | if (LEval.isMinSignedValue()) | ||||||
13775 | return ICEDiag(IK_ICEIfUnevaluated, E->getBeginLoc()); | ||||||
13776 | } | ||||||
13777 | } | ||||||
13778 | } | ||||||
13779 | if (Exp->getOpcode() == BO_Comma) { | ||||||
13780 | if (Ctx.getLangOpts().C99) { | ||||||
13781 | // C99 6.6p3 introduces a strange edge case: comma can be in an ICE | ||||||
13782 | // if it isn't evaluated. | ||||||
13783 | if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICE) | ||||||
13784 | return ICEDiag(IK_ICEIfUnevaluated, E->getBeginLoc()); | ||||||
13785 | } else { | ||||||
13786 | // In both C89 and C++, commas in ICEs are illegal. | ||||||
13787 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13788 | } | ||||||
13789 | } | ||||||
13790 | return Worst(LHSResult, RHSResult); | ||||||
13791 | } | ||||||
13792 | case BO_LAnd: | ||||||
13793 | case BO_LOr: { | ||||||
13794 | ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); | ||||||
13795 | ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); | ||||||
13796 | if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICEIfUnevaluated) { | ||||||
13797 | // Rare case where the RHS has a comma "side-effect"; we need | ||||||
13798 | // to actually check the condition to see whether the side | ||||||
13799 | // with the comma is evaluated. | ||||||
13800 | if ((Exp->getOpcode() == BO_LAnd) != | ||||||
13801 | (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) | ||||||
13802 | return RHSResult; | ||||||
13803 | return NoDiag(); | ||||||
13804 | } | ||||||
13805 | |||||||
13806 | return Worst(LHSResult, RHSResult); | ||||||
13807 | } | ||||||
13808 | } | ||||||
13809 | llvm_unreachable("invalid binary operator kind")::llvm::llvm_unreachable_internal("invalid binary operator kind" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13809); | ||||||
13810 | } | ||||||
13811 | case Expr::ImplicitCastExprClass: | ||||||
13812 | case Expr::CStyleCastExprClass: | ||||||
13813 | case Expr::CXXFunctionalCastExprClass: | ||||||
13814 | case Expr::CXXStaticCastExprClass: | ||||||
13815 | case Expr::CXXReinterpretCastExprClass: | ||||||
13816 | case Expr::CXXConstCastExprClass: | ||||||
13817 | case Expr::ObjCBridgedCastExprClass: { | ||||||
13818 | const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); | ||||||
13819 | if (isa<ExplicitCastExpr>(E)) { | ||||||
13820 | if (const FloatingLiteral *FL | ||||||
13821 | = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { | ||||||
13822 | unsigned DestWidth = Ctx.getIntWidth(E->getType()); | ||||||
13823 | bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); | ||||||
13824 | APSInt IgnoredVal(DestWidth, !DestSigned); | ||||||
13825 | bool Ignored; | ||||||
13826 | // If the value does not fit in the destination type, the behavior is | ||||||
13827 | // undefined, so we are not required to treat it as a constant | ||||||
13828 | // expression. | ||||||
13829 | if (FL->getValue().convertToInteger(IgnoredVal, | ||||||
13830 | llvm::APFloat::rmTowardZero, | ||||||
13831 | &Ignored) & APFloat::opInvalidOp) | ||||||
13832 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13833 | return NoDiag(); | ||||||
13834 | } | ||||||
13835 | } | ||||||
13836 | switch (cast<CastExpr>(E)->getCastKind()) { | ||||||
13837 | case CK_LValueToRValue: | ||||||
13838 | case CK_AtomicToNonAtomic: | ||||||
13839 | case CK_NonAtomicToAtomic: | ||||||
13840 | case CK_NoOp: | ||||||
13841 | case CK_IntegralToBoolean: | ||||||
13842 | case CK_IntegralCast: | ||||||
13843 | return CheckICE(SubExpr, Ctx); | ||||||
13844 | default: | ||||||
13845 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13846 | } | ||||||
13847 | } | ||||||
13848 | case Expr::BinaryConditionalOperatorClass: { | ||||||
13849 | const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); | ||||||
13850 | ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); | ||||||
13851 | if (CommonResult.Kind == IK_NotICE) return CommonResult; | ||||||
13852 | ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); | ||||||
13853 | if (FalseResult.Kind == IK_NotICE) return FalseResult; | ||||||
13854 | if (CommonResult.Kind == IK_ICEIfUnevaluated) return CommonResult; | ||||||
13855 | if (FalseResult.Kind == IK_ICEIfUnevaluated && | ||||||
13856 | Exp->getCommon()->EvaluateKnownConstInt(Ctx) != 0) return NoDiag(); | ||||||
13857 | return FalseResult; | ||||||
13858 | } | ||||||
13859 | case Expr::ConditionalOperatorClass: { | ||||||
13860 | const ConditionalOperator *Exp = cast<ConditionalOperator>(E); | ||||||
13861 | // If the condition (ignoring parens) is a __builtin_constant_p call, | ||||||
13862 | // then only the true side is actually considered in an integer constant | ||||||
13863 | // expression, and it is fully evaluated. This is an important GNU | ||||||
13864 | // extension. See GCC PR38377 for discussion. | ||||||
13865 | if (const CallExpr *CallCE | ||||||
13866 | = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) | ||||||
13867 | if (CallCE->getBuiltinCallee() == Builtin::BI__builtin_constant_p) | ||||||
13868 | return CheckEvalInICE(E, Ctx); | ||||||
13869 | ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); | ||||||
13870 | if (CondResult.Kind == IK_NotICE) | ||||||
13871 | return CondResult; | ||||||
13872 | |||||||
13873 | ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); | ||||||
13874 | ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); | ||||||
13875 | |||||||
13876 | if (TrueResult.Kind == IK_NotICE) | ||||||
13877 | return TrueResult; | ||||||
13878 | if (FalseResult.Kind == IK_NotICE) | ||||||
13879 | return FalseResult; | ||||||
13880 | if (CondResult.Kind == IK_ICEIfUnevaluated) | ||||||
13881 | return CondResult; | ||||||
13882 | if (TrueResult.Kind == IK_ICE && FalseResult.Kind == IK_ICE) | ||||||
13883 | return NoDiag(); | ||||||
13884 | // Rare case where the diagnostics depend on which side is evaluated | ||||||
13885 | // Note that if we get here, CondResult is 0, and at least one of | ||||||
13886 | // TrueResult and FalseResult is non-zero. | ||||||
13887 | if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) | ||||||
13888 | return FalseResult; | ||||||
13889 | return TrueResult; | ||||||
13890 | } | ||||||
13891 | case Expr::CXXDefaultArgExprClass: | ||||||
13892 | return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); | ||||||
13893 | case Expr::CXXDefaultInitExprClass: | ||||||
13894 | return CheckICE(cast<CXXDefaultInitExpr>(E)->getExpr(), Ctx); | ||||||
13895 | case Expr::ChooseExprClass: { | ||||||
13896 | return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(), Ctx); | ||||||
13897 | } | ||||||
13898 | case Expr::BuiltinBitCastExprClass: { | ||||||
13899 | if (!checkBitCastConstexprEligibility(nullptr, Ctx, cast<CastExpr>(E))) | ||||||
13900 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | ||||||
13901 | return CheckICE(cast<CastExpr>(E)->getSubExpr(), Ctx); | ||||||
13902 | } | ||||||
13903 | } | ||||||
13904 | |||||||
13905 | llvm_unreachable("Invalid StmtClass!")::llvm::llvm_unreachable_internal("Invalid StmtClass!", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13905); | ||||||
13906 | } | ||||||
13907 | |||||||
13908 | /// Evaluate an expression as a C++11 integral constant expression. | ||||||
13909 | static bool EvaluateCPlusPlus11IntegralConstantExpr(const ASTContext &Ctx, | ||||||
13910 | const Expr *E, | ||||||
13911 | llvm::APSInt *Value, | ||||||
13912 | SourceLocation *Loc) { | ||||||
13913 | if (!E->getType()->isIntegralOrUnscopedEnumerationType()) { | ||||||
13914 | if (Loc) *Loc = E->getExprLoc(); | ||||||
13915 | return false; | ||||||
13916 | } | ||||||
13917 | |||||||
13918 | APValue Result; | ||||||
13919 | if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) | ||||||
13920 | return false; | ||||||
13921 | |||||||
13922 | if (!Result.isInt()) { | ||||||
13923 | if (Loc) *Loc = E->getExprLoc(); | ||||||
13924 | return false; | ||||||
13925 | } | ||||||
13926 | |||||||
13927 | if (Value) *Value = Result.getInt(); | ||||||
13928 | return true; | ||||||
13929 | } | ||||||
13930 | |||||||
13931 | bool Expr::isIntegerConstantExpr(const ASTContext &Ctx, | ||||||
13932 | SourceLocation *Loc) const { | ||||||
13933 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13934, __PRETTY_FUNCTION__)) | ||||||
13934 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13934, __PRETTY_FUNCTION__)); | ||||||
13935 | |||||||
13936 | if (Ctx.getLangOpts().CPlusPlus11) | ||||||
13937 | return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, nullptr, Loc); | ||||||
13938 | |||||||
13939 | ICEDiag D = CheckICE(this, Ctx); | ||||||
13940 | if (D.Kind != IK_ICE) { | ||||||
13941 | if (Loc) *Loc = D.Loc; | ||||||
13942 | return false; | ||||||
13943 | } | ||||||
13944 | return true; | ||||||
13945 | } | ||||||
13946 | |||||||
13947 | bool Expr::isIntegerConstantExpr(llvm::APSInt &Value, const ASTContext &Ctx, | ||||||
13948 | SourceLocation *Loc, bool isEvaluated) const { | ||||||
13949 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13950, __PRETTY_FUNCTION__)) | ||||||
13950 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13950, __PRETTY_FUNCTION__)); | ||||||
13951 | |||||||
13952 | if (Ctx.getLangOpts().CPlusPlus11) | ||||||
13953 | return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc); | ||||||
13954 | |||||||
13955 | if (!isIntegerConstantExpr(Ctx, Loc)) | ||||||
13956 | return false; | ||||||
13957 | |||||||
13958 | // The only possible side-effects here are due to UB discovered in the | ||||||
13959 | // evaluation (for instance, INT_MAX + 1). In such a case, we are still | ||||||
13960 | // required to treat the expression as an ICE, so we produce the folded | ||||||
13961 | // value. | ||||||
13962 | EvalResult ExprResult; | ||||||
13963 | Expr::EvalStatus Status; | ||||||
13964 | EvalInfo Info(Ctx, Status, EvalInfo::EM_IgnoreSideEffects); | ||||||
13965 | Info.InConstantContext = true; | ||||||
13966 | |||||||
13967 | if (!::EvaluateAsInt(this, ExprResult, Ctx, SE_AllowSideEffects, Info)) | ||||||
13968 | llvm_unreachable("ICE cannot be evaluated!")::llvm::llvm_unreachable_internal("ICE cannot be evaluated!", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13968); | ||||||
13969 | |||||||
13970 | Value = ExprResult.Val.getInt(); | ||||||
13971 | return true; | ||||||
13972 | } | ||||||
13973 | |||||||
13974 | bool Expr::isCXX98IntegralConstantExpr(const ASTContext &Ctx) const { | ||||||
13975 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13976, __PRETTY_FUNCTION__)) | ||||||
13976 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13976, __PRETTY_FUNCTION__)); | ||||||
13977 | |||||||
13978 | return CheckICE(this, Ctx).Kind == IK_ICE; | ||||||
13979 | } | ||||||
13980 | |||||||
13981 | bool Expr::isCXX11ConstantExpr(const ASTContext &Ctx, APValue *Result, | ||||||
13982 | SourceLocation *Loc) const { | ||||||
13983 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13984, __PRETTY_FUNCTION__)) | ||||||
13984 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13984, __PRETTY_FUNCTION__)); | ||||||
13985 | |||||||
13986 | // We support this checking in C++98 mode in order to diagnose compatibility | ||||||
13987 | // issues. | ||||||
13988 | assert(Ctx.getLangOpts().CPlusPlus)((Ctx.getLangOpts().CPlusPlus) ? static_cast<void> (0) : __assert_fail ("Ctx.getLangOpts().CPlusPlus", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 13988, __PRETTY_FUNCTION__)); | ||||||
13989 | |||||||
13990 | // Build evaluation settings. | ||||||
13991 | Expr::EvalStatus Status; | ||||||
13992 | SmallVector<PartialDiagnosticAt, 8> Diags; | ||||||
13993 | Status.Diag = &Diags; | ||||||
13994 | EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpression); | ||||||
13995 | |||||||
13996 | APValue Scratch; | ||||||
13997 | bool IsConstExpr = | ||||||
13998 | ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch) && | ||||||
13999 | // FIXME: We don't produce a diagnostic for this, but the callers that | ||||||
14000 | // call us on arbitrary full-expressions should generally not care. | ||||||
14001 | Info.discardCleanups() && !Status.HasSideEffects; | ||||||
14002 | |||||||
14003 | if (!Diags.empty()) { | ||||||
14004 | IsConstExpr = false; | ||||||
14005 | if (Loc) *Loc = Diags[0].first; | ||||||
14006 | } else if (!IsConstExpr) { | ||||||
14007 | // FIXME: This shouldn't happen. | ||||||
14008 | if (Loc) *Loc = getExprLoc(); | ||||||
14009 | } | ||||||
14010 | |||||||
14011 | return IsConstExpr; | ||||||
14012 | } | ||||||
14013 | |||||||
14014 | bool Expr::EvaluateWithSubstitution(APValue &Value, ASTContext &Ctx, | ||||||
14015 | const FunctionDecl *Callee, | ||||||
14016 | ArrayRef<const Expr*> Args, | ||||||
14017 | const Expr *This) const { | ||||||
14018 | assert(!isValueDependent() &&((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 14019, __PRETTY_FUNCTION__)) | ||||||
14019 | "Expression evaluator can't be called on a dependent expression.")((!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 14019, __PRETTY_FUNCTION__)); | ||||||
14020 | |||||||
14021 | Expr::EvalStatus Status; | ||||||
14022 | EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpressionUnevaluated); | ||||||
14023 | Info.InConstantContext = true; | ||||||
14024 | |||||||
14025 | LValue ThisVal; | ||||||
14026 | const LValue *ThisPtr = nullptr; | ||||||
14027 | if (This) { | ||||||
14028 | #ifndef NDEBUG | ||||||
14029 | auto *MD = dyn_cast<CXXMethodDecl>(Callee); | ||||||
14030 | assert(MD && "Don't provide `this` for non-methods.")((MD && "Don't provide `this` for non-methods.") ? static_cast <void> (0) : __assert_fail ("MD && \"Don't provide `this` for non-methods.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 14030, __PRETTY_FUNCTION__)); | ||||||
14031 | assert(!MD->isStatic() && "Don't provide `this` for static methods.")((!MD->isStatic() && "Don't provide `this` for static methods." ) ? static_cast<void> (0) : __assert_fail ("!MD->isStatic() && \"Don't provide `this` for static methods.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 14031, __PRETTY_FUNCTION__)); | ||||||
14032 | #endif | ||||||
14033 | if (EvaluateObjectArgument(Info, This, ThisVal)) | ||||||
14034 | ThisPtr = &ThisVal; | ||||||
14035 | if (Info.EvalStatus.HasSideEffects) | ||||||
14036 | return false; | ||||||
14037 | } | ||||||
14038 | |||||||
14039 | ArgVector ArgValues(Args.size()); | ||||||
14040 | for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); | ||||||
14041 | I != E; ++I) { | ||||||
14042 | if ((*I)->isValueDependent() || | ||||||
14043 | !Evaluate(ArgValues[I - Args.begin()], Info, *I)) | ||||||
14044 | // If evaluation fails, throw away the argument entirely. | ||||||
14045 | ArgValues[I - Args.begin()] = APValue(); | ||||||
14046 | if (Info.EvalStatus.HasSideEffects) | ||||||
14047 | return false; | ||||||
14048 | } | ||||||
14049 | |||||||
14050 | // Build fake call to Callee. | ||||||
14051 | CallStackFrame Frame(Info, Callee->getLocation(), Callee, ThisPtr, | ||||||
14052 | ArgValues.data()); | ||||||
14053 | return Evaluate(Value, Info, this) && Info.discardCleanups() && | ||||||
14054 | !Info.EvalStatus.HasSideEffects; | ||||||
14055 | } | ||||||
14056 | |||||||
14057 | bool Expr::isPotentialConstantExpr(const FunctionDecl *FD, | ||||||
14058 | SmallVectorImpl< | ||||||
14059 | PartialDiagnosticAt> &Diags) { | ||||||
14060 | // FIXME: It would be useful to check constexpr function templates, but at the | ||||||
14061 | // moment the constant expression evaluator cannot cope with the non-rigorous | ||||||
14062 | // ASTs which we build for dependent expressions. | ||||||
14063 | if (FD->isDependentContext()) | ||||||
14064 | return true; | ||||||
14065 | |||||||
14066 | Expr::EvalStatus Status; | ||||||
14067 | Status.Diag = &Diags; | ||||||
14068 | |||||||
14069 | EvalInfo Info(FD->getASTContext(), Status, EvalInfo::EM_ConstantExpression); | ||||||
14070 | Info.InConstantContext = true; | ||||||
14071 | Info.CheckingPotentialConstantExpression = true; | ||||||
14072 | |||||||
14073 | // The constexpr VM attempts to compile all methods to bytecode here. | ||||||
14074 | if (Info.EnableNewConstInterp) { | ||||||
14075 | auto &InterpCtx = Info.Ctx.getInterpContext(); | ||||||
14076 | switch (InterpCtx.isPotentialConstantExpr(Info, FD)) { | ||||||
14077 | case interp::InterpResult::Success: | ||||||
14078 | case interp::InterpResult::Fail: | ||||||
14079 | return Diags.empty(); | ||||||
14080 | case interp::InterpResult::Bail: | ||||||
14081 | break; | ||||||
14082 | } | ||||||
14083 | } | ||||||
14084 | |||||||
14085 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); | ||||||
14086 | const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : nullptr; | ||||||
14087 | |||||||
14088 | // Fabricate an arbitrary expression on the stack and pretend that it | ||||||
14089 | // is a temporary being used as the 'this' pointer. | ||||||
14090 | LValue This; | ||||||
14091 | ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); | ||||||
14092 | This.set({&VIE, Info.CurrentCall->Index}); | ||||||
14093 | |||||||
14094 | ArrayRef<const Expr*> Args; | ||||||
14095 | |||||||
14096 | APValue Scratch; | ||||||
14097 | if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { | ||||||
14098 | // Evaluate the call as a constant initializer, to allow the construction | ||||||
14099 | // of objects of non-literal types. | ||||||
14100 | Info.setEvaluatingDecl(This.getLValueBase(), Scratch); | ||||||
14101 | HandleConstructorCall(&VIE, This, Args, CD, Info, Scratch); | ||||||
14102 | } else { | ||||||
14103 | SourceLocation Loc = FD->getLocation(); | ||||||
14104 | HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : nullptr, | ||||||
14105 | Args, FD->getBody(), Info, Scratch, nullptr); | ||||||
14106 | } | ||||||
14107 | |||||||
14108 | return Diags.empty(); | ||||||
14109 | } | ||||||
14110 | |||||||
14111 | bool Expr::isPotentialConstantExprUnevaluated(Expr *E, | ||||||
14112 | const FunctionDecl *FD, | ||||||
14113 | SmallVectorImpl< | ||||||
14114 | PartialDiagnosticAt> &Diags) { | ||||||
14115 | assert(!E->isValueDependent() &&((!E->isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!E->isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 14116, __PRETTY_FUNCTION__)) | ||||||
14116 | "Expression evaluator can't be called on a dependent expression.")((!E->isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? static_cast<void> (0) : __assert_fail ("!E->isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 14116, __PRETTY_FUNCTION__)); | ||||||
14117 | |||||||
14118 | Expr::EvalStatus Status; | ||||||
14119 | Status.Diag = &Diags; | ||||||
14120 | |||||||
14121 | EvalInfo Info(FD->getASTContext(), Status, | ||||||
14122 | EvalInfo::EM_ConstantExpressionUnevaluated); | ||||||
14123 | Info.InConstantContext = true; | ||||||
14124 | Info.CheckingPotentialConstantExpression = true; | ||||||
14125 | |||||||
14126 | // Fabricate a call stack frame to give the arguments a plausible cover story. | ||||||
14127 | ArrayRef<const Expr*> Args; | ||||||
14128 | ArgVector ArgValues(0); | ||||||
14129 | bool Success = EvaluateArgs(Args, ArgValues, Info, FD); | ||||||
14130 | (void)Success; | ||||||
14131 | assert(Success &&((Success && "Failed to set up arguments for potential constant evaluation" ) ? static_cast<void> (0) : __assert_fail ("Success && \"Failed to set up arguments for potential constant evaluation\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 14132, __PRETTY_FUNCTION__)) | ||||||
14132 | "Failed to set up arguments for potential constant evaluation")((Success && "Failed to set up arguments for potential constant evaluation" ) ? static_cast<void> (0) : __assert_fail ("Success && \"Failed to set up arguments for potential constant evaluation\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/lib/AST/ExprConstant.cpp" , 14132, __PRETTY_FUNCTION__)); | ||||||
14133 | CallStackFrame Frame(Info, SourceLocation(), FD, nullptr, ArgValues.data()); | ||||||
14134 | |||||||
14135 | APValue ResultScratch; | ||||||
14136 | Evaluate(ResultScratch, Info, E); | ||||||
14137 | return Diags.empty(); | ||||||
14138 | } | ||||||
14139 | |||||||
14140 | bool Expr::tryEvaluateObjectSize(uint64_t &Result, ASTContext &Ctx, | ||||||
14141 | unsigned Type) const { | ||||||
14142 | if (!getType()->isPointerType()) | ||||||
14143 | return false; | ||||||
14144 | |||||||
14145 | Expr::EvalStatus Status; | ||||||
14146 | EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantFold); | ||||||
14147 | return tryEvaluateBuiltinObjectSize(this, Type, Info, Result); | ||||||
14148 | } |
1 | //===- Decl.h - Classes for representing declarations -----------*- C++ -*-===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file defines the Decl subclasses. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #ifndef LLVM_CLANG_AST_DECL_H |
14 | #define LLVM_CLANG_AST_DECL_H |
15 | |
16 | #include "clang/AST/APValue.h" |
17 | #include "clang/AST/ASTContextAllocate.h" |
18 | #include "clang/AST/DeclBase.h" |
19 | #include "clang/AST/DeclarationName.h" |
20 | #include "clang/AST/ExternalASTSource.h" |
21 | #include "clang/AST/NestedNameSpecifier.h" |
22 | #include "clang/AST/Redeclarable.h" |
23 | #include "clang/AST/Type.h" |
24 | #include "clang/Basic/AddressSpaces.h" |
25 | #include "clang/Basic/Diagnostic.h" |
26 | #include "clang/Basic/IdentifierTable.h" |
27 | #include "clang/Basic/LLVM.h" |
28 | #include "clang/Basic/Linkage.h" |
29 | #include "clang/Basic/OperatorKinds.h" |
30 | #include "clang/Basic/PartialDiagnostic.h" |
31 | #include "clang/Basic/PragmaKinds.h" |
32 | #include "clang/Basic/SourceLocation.h" |
33 | #include "clang/Basic/Specifiers.h" |
34 | #include "clang/Basic/Visibility.h" |
35 | #include "llvm/ADT/APSInt.h" |
36 | #include "llvm/ADT/ArrayRef.h" |
37 | #include "llvm/ADT/Optional.h" |
38 | #include "llvm/ADT/PointerIntPair.h" |
39 | #include "llvm/ADT/PointerUnion.h" |
40 | #include "llvm/ADT/StringRef.h" |
41 | #include "llvm/ADT/iterator_range.h" |
42 | #include "llvm/Support/Casting.h" |
43 | #include "llvm/Support/Compiler.h" |
44 | #include "llvm/Support/TrailingObjects.h" |
45 | #include <cassert> |
46 | #include <cstddef> |
47 | #include <cstdint> |
48 | #include <string> |
49 | #include <utility> |
50 | |
51 | namespace clang { |
52 | |
53 | class ASTContext; |
54 | struct ASTTemplateArgumentListInfo; |
55 | class Attr; |
56 | class CompoundStmt; |
57 | class DependentFunctionTemplateSpecializationInfo; |
58 | class EnumDecl; |
59 | class Expr; |
60 | class FunctionTemplateDecl; |
61 | class FunctionTemplateSpecializationInfo; |
62 | class LabelStmt; |
63 | class MemberSpecializationInfo; |
64 | class Module; |
65 | class NamespaceDecl; |
66 | class ParmVarDecl; |
67 | class RecordDecl; |
68 | class Stmt; |
69 | class StringLiteral; |
70 | class TagDecl; |
71 | class TemplateArgumentList; |
72 | class TemplateArgumentListInfo; |
73 | class TemplateParameterList; |
74 | class TypeAliasTemplateDecl; |
75 | class TypeLoc; |
76 | class UnresolvedSetImpl; |
77 | class VarTemplateDecl; |
78 | |
79 | /// A container of type source information. |
80 | /// |
81 | /// A client can read the relevant info using TypeLoc wrappers, e.g: |
82 | /// @code |
83 | /// TypeLoc TL = TypeSourceInfo->getTypeLoc(); |
84 | /// TL.getBeginLoc().print(OS, SrcMgr); |
85 | /// @endcode |
86 | class alignas(8) TypeSourceInfo { |
87 | // Contains a memory block after the class, used for type source information, |
88 | // allocated by ASTContext. |
89 | friend class ASTContext; |
90 | |
91 | QualType Ty; |
92 | |
93 | TypeSourceInfo(QualType ty) : Ty(ty) {} |
94 | |
95 | public: |
96 | /// Return the type wrapped by this type source info. |
97 | QualType getType() const { return Ty; } |
98 | |
99 | /// Return the TypeLoc wrapper for the type source info. |
100 | TypeLoc getTypeLoc() const; // implemented in TypeLoc.h |
101 | |
102 | /// Override the type stored in this TypeSourceInfo. Use with caution! |
103 | void overrideType(QualType T) { Ty = T; } |
104 | }; |
105 | |
106 | /// The top declaration context. |
107 | class TranslationUnitDecl : public Decl, public DeclContext { |
108 | ASTContext &Ctx; |
109 | |
110 | /// The (most recently entered) anonymous namespace for this |
111 | /// translation unit, if one has been created. |
112 | NamespaceDecl *AnonymousNamespace = nullptr; |
113 | |
114 | explicit TranslationUnitDecl(ASTContext &ctx); |
115 | |
116 | virtual void anchor(); |
117 | |
118 | public: |
119 | ASTContext &getASTContext() const { return Ctx; } |
120 | |
121 | NamespaceDecl *getAnonymousNamespace() const { return AnonymousNamespace; } |
122 | void setAnonymousNamespace(NamespaceDecl *D) { AnonymousNamespace = D; } |
123 | |
124 | static TranslationUnitDecl *Create(ASTContext &C); |
125 | |
126 | // Implement isa/cast/dyncast/etc. |
127 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
128 | static bool classofKind(Kind K) { return K == TranslationUnit; } |
129 | static DeclContext *castToDeclContext(const TranslationUnitDecl *D) { |
130 | return static_cast<DeclContext *>(const_cast<TranslationUnitDecl*>(D)); |
131 | } |
132 | static TranslationUnitDecl *castFromDeclContext(const DeclContext *DC) { |
133 | return static_cast<TranslationUnitDecl *>(const_cast<DeclContext*>(DC)); |
134 | } |
135 | }; |
136 | |
137 | /// Represents a `#pragma comment` line. Always a child of |
138 | /// TranslationUnitDecl. |
139 | class PragmaCommentDecl final |
140 | : public Decl, |
141 | private llvm::TrailingObjects<PragmaCommentDecl, char> { |
142 | friend class ASTDeclReader; |
143 | friend class ASTDeclWriter; |
144 | friend TrailingObjects; |
145 | |
146 | PragmaMSCommentKind CommentKind; |
147 | |
148 | PragmaCommentDecl(TranslationUnitDecl *TU, SourceLocation CommentLoc, |
149 | PragmaMSCommentKind CommentKind) |
150 | : Decl(PragmaComment, TU, CommentLoc), CommentKind(CommentKind) {} |
151 | |
152 | virtual void anchor(); |
153 | |
154 | public: |
155 | static PragmaCommentDecl *Create(const ASTContext &C, TranslationUnitDecl *DC, |
156 | SourceLocation CommentLoc, |
157 | PragmaMSCommentKind CommentKind, |
158 | StringRef Arg); |
159 | static PragmaCommentDecl *CreateDeserialized(ASTContext &C, unsigned ID, |
160 | unsigned ArgSize); |
161 | |
162 | PragmaMSCommentKind getCommentKind() const { return CommentKind; } |
163 | |
164 | StringRef getArg() const { return getTrailingObjects<char>(); } |
165 | |
166 | // Implement isa/cast/dyncast/etc. |
167 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
168 | static bool classofKind(Kind K) { return K == PragmaComment; } |
169 | }; |
170 | |
171 | /// Represents a `#pragma detect_mismatch` line. Always a child of |
172 | /// TranslationUnitDecl. |
173 | class PragmaDetectMismatchDecl final |
174 | : public Decl, |
175 | private llvm::TrailingObjects<PragmaDetectMismatchDecl, char> { |
176 | friend class ASTDeclReader; |
177 | friend class ASTDeclWriter; |
178 | friend TrailingObjects; |
179 | |
180 | size_t ValueStart; |
181 | |
182 | PragmaDetectMismatchDecl(TranslationUnitDecl *TU, SourceLocation Loc, |
183 | size_t ValueStart) |
184 | : Decl(PragmaDetectMismatch, TU, Loc), ValueStart(ValueStart) {} |
185 | |
186 | virtual void anchor(); |
187 | |
188 | public: |
189 | static PragmaDetectMismatchDecl *Create(const ASTContext &C, |
190 | TranslationUnitDecl *DC, |
191 | SourceLocation Loc, StringRef Name, |
192 | StringRef Value); |
193 | static PragmaDetectMismatchDecl * |
194 | CreateDeserialized(ASTContext &C, unsigned ID, unsigned NameValueSize); |
195 | |
196 | StringRef getName() const { return getTrailingObjects<char>(); } |
197 | StringRef getValue() const { return getTrailingObjects<char>() + ValueStart; } |
198 | |
199 | // Implement isa/cast/dyncast/etc. |
200 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
201 | static bool classofKind(Kind K) { return K == PragmaDetectMismatch; } |
202 | }; |
203 | |
204 | /// Declaration context for names declared as extern "C" in C++. This |
205 | /// is neither the semantic nor lexical context for such declarations, but is |
206 | /// used to check for conflicts with other extern "C" declarations. Example: |
207 | /// |
208 | /// \code |
209 | /// namespace N { extern "C" void f(); } // #1 |
210 | /// void N::f() {} // #2 |
211 | /// namespace M { extern "C" void f(); } // #3 |
212 | /// \endcode |
213 | /// |
214 | /// The semantic context of #1 is namespace N and its lexical context is the |
215 | /// LinkageSpecDecl; the semantic context of #2 is namespace N and its lexical |
216 | /// context is the TU. However, both declarations are also visible in the |
217 | /// extern "C" context. |
218 | /// |
219 | /// The declaration at #3 finds it is a redeclaration of \c N::f through |
220 | /// lookup in the extern "C" context. |
221 | class ExternCContextDecl : public Decl, public DeclContext { |
222 | explicit ExternCContextDecl(TranslationUnitDecl *TU) |
223 | : Decl(ExternCContext, TU, SourceLocation()), |
224 | DeclContext(ExternCContext) {} |
225 | |
226 | virtual void anchor(); |
227 | |
228 | public: |
229 | static ExternCContextDecl *Create(const ASTContext &C, |
230 | TranslationUnitDecl *TU); |
231 | |
232 | // Implement isa/cast/dyncast/etc. |
233 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
234 | static bool classofKind(Kind K) { return K == ExternCContext; } |
235 | static DeclContext *castToDeclContext(const ExternCContextDecl *D) { |
236 | return static_cast<DeclContext *>(const_cast<ExternCContextDecl*>(D)); |
237 | } |
238 | static ExternCContextDecl *castFromDeclContext(const DeclContext *DC) { |
239 | return static_cast<ExternCContextDecl *>(const_cast<DeclContext*>(DC)); |
240 | } |
241 | }; |
242 | |
243 | /// This represents a decl that may have a name. Many decls have names such |
244 | /// as ObjCMethodDecl, but not \@class, etc. |
245 | /// |
246 | /// Note that not every NamedDecl is actually named (e.g., a struct might |
247 | /// be anonymous), and not every name is an identifier. |
248 | class NamedDecl : public Decl { |
249 | /// The name of this declaration, which is typically a normal |
250 | /// identifier but may also be a special kind of name (C++ |
251 | /// constructor, Objective-C selector, etc.) |
252 | DeclarationName Name; |
253 | |
254 | virtual void anchor(); |
255 | |
256 | private: |
257 | NamedDecl *getUnderlyingDeclImpl() LLVM_READONLY__attribute__((__pure__)); |
258 | |
259 | protected: |
260 | NamedDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName N) |
261 | : Decl(DK, DC, L), Name(N) {} |
262 | |
263 | public: |
264 | /// Get the identifier that names this declaration, if there is one. |
265 | /// |
266 | /// This will return NULL if this declaration has no name (e.g., for |
267 | /// an unnamed class) or if the name is a special name (C++ constructor, |
268 | /// Objective-C selector, etc.). |
269 | IdentifierInfo *getIdentifier() const { return Name.getAsIdentifierInfo(); } |
270 | |
271 | /// Get the name of identifier for this declaration as a StringRef. |
272 | /// |
273 | /// This requires that the declaration have a name and that it be a simple |
274 | /// identifier. |
275 | StringRef getName() const { |
276 | assert(Name.isIdentifier() && "Name is not a simple identifier")((Name.isIdentifier() && "Name is not a simple identifier" ) ? static_cast<void> (0) : __assert_fail ("Name.isIdentifier() && \"Name is not a simple identifier\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 276, __PRETTY_FUNCTION__)); |
277 | return getIdentifier() ? getIdentifier()->getName() : ""; |
278 | } |
279 | |
280 | /// Get a human-readable name for the declaration, even if it is one of the |
281 | /// special kinds of names (C++ constructor, Objective-C selector, etc). |
282 | /// |
283 | /// Creating this name requires expensive string manipulation, so it should |
284 | /// be called only when performance doesn't matter. For simple declarations, |
285 | /// getNameAsCString() should suffice. |
286 | // |
287 | // FIXME: This function should be renamed to indicate that it is not just an |
288 | // alternate form of getName(), and clients should move as appropriate. |
289 | // |
290 | // FIXME: Deprecated, move clients to getName(). |
291 | std::string getNameAsString() const { return Name.getAsString(); } |
292 | |
293 | virtual void printName(raw_ostream &os) const; |
294 | |
295 | /// Get the actual, stored name of the declaration, which may be a special |
296 | /// name. |
297 | DeclarationName getDeclName() const { return Name; } |
298 | |
299 | /// Set the name of this declaration. |
300 | void setDeclName(DeclarationName N) { Name = N; } |
301 | |
302 | /// Returns a human-readable qualified name for this declaration, like |
303 | /// A::B::i, for i being member of namespace A::B. |
304 | /// |
305 | /// If the declaration is not a member of context which can be named (record, |
306 | /// namespace), it will return the same result as printName(). |
307 | /// |
308 | /// Creating this name is expensive, so it should be called only when |
309 | /// performance doesn't matter. |
310 | void printQualifiedName(raw_ostream &OS) const; |
311 | void printQualifiedName(raw_ostream &OS, const PrintingPolicy &Policy) const; |
312 | |
313 | /// Print only the nested name specifier part of a fully-qualified name, |
314 | /// including the '::' at the end. E.g. |
315 | /// when `printQualifiedName(D)` prints "A::B::i", |
316 | /// this function prints "A::B::". |
317 | void printNestedNameSpecifier(raw_ostream &OS) const; |
318 | void printNestedNameSpecifier(raw_ostream &OS, |
319 | const PrintingPolicy &Policy) const; |
320 | |
321 | // FIXME: Remove string version. |
322 | std::string getQualifiedNameAsString() const; |
323 | |
324 | /// Appends a human-readable name for this declaration into the given stream. |
325 | /// |
326 | /// This is the method invoked by Sema when displaying a NamedDecl |
327 | /// in a diagnostic. It does not necessarily produce the same |
328 | /// result as printName(); for example, class template |
329 | /// specializations are printed with their template arguments. |
330 | virtual void getNameForDiagnostic(raw_ostream &OS, |
331 | const PrintingPolicy &Policy, |
332 | bool Qualified) const; |
333 | |
334 | /// Determine whether this declaration, if known to be well-formed within |
335 | /// its context, will replace the declaration OldD if introduced into scope. |
336 | /// |
337 | /// A declaration will replace another declaration if, for example, it is |
338 | /// a redeclaration of the same variable or function, but not if it is a |
339 | /// declaration of a different kind (function vs. class) or an overloaded |
340 | /// function. |
341 | /// |
342 | /// \param IsKnownNewer \c true if this declaration is known to be newer |
343 | /// than \p OldD (for instance, if this declaration is newly-created). |
344 | bool declarationReplaces(NamedDecl *OldD, bool IsKnownNewer = true) const; |
345 | |
346 | /// Determine whether this declaration has linkage. |
347 | bool hasLinkage() const; |
348 | |
349 | using Decl::isModulePrivate; |
350 | using Decl::setModulePrivate; |
351 | |
352 | /// Determine whether this declaration is a C++ class member. |
353 | bool isCXXClassMember() const { |
354 | const DeclContext *DC = getDeclContext(); |
355 | |
356 | // C++0x [class.mem]p1: |
357 | // The enumerators of an unscoped enumeration defined in |
358 | // the class are members of the class. |
359 | if (isa<EnumDecl>(DC)) |
360 | DC = DC->getRedeclContext(); |
361 | |
362 | return DC->isRecord(); |
363 | } |
364 | |
365 | /// Determine whether the given declaration is an instance member of |
366 | /// a C++ class. |
367 | bool isCXXInstanceMember() const; |
368 | |
369 | /// Determine what kind of linkage this entity has. |
370 | /// |
371 | /// This is not the linkage as defined by the standard or the codegen notion |
372 | /// of linkage. It is just an implementation detail that is used to compute |
373 | /// those. |
374 | Linkage getLinkageInternal() const; |
375 | |
376 | /// Get the linkage from a semantic point of view. Entities in |
377 | /// anonymous namespaces are external (in c++98). |
378 | Linkage getFormalLinkage() const { |
379 | return clang::getFormalLinkage(getLinkageInternal()); |
380 | } |
381 | |
382 | /// True if this decl has external linkage. |
383 | bool hasExternalFormalLinkage() const { |
384 | return isExternalFormalLinkage(getLinkageInternal()); |
385 | } |
386 | |
387 | bool isExternallyVisible() const { |
388 | return clang::isExternallyVisible(getLinkageInternal()); |
389 | } |
390 | |
391 | /// Determine whether this declaration can be redeclared in a |
392 | /// different translation unit. |
393 | bool isExternallyDeclarable() const { |
394 | return isExternallyVisible() && !getOwningModuleForLinkage(); |
395 | } |
396 | |
397 | /// Determines the visibility of this entity. |
398 | Visibility getVisibility() const { |
399 | return getLinkageAndVisibility().getVisibility(); |
400 | } |
401 | |
402 | /// Determines the linkage and visibility of this entity. |
403 | LinkageInfo getLinkageAndVisibility() const; |
404 | |
405 | /// Kinds of explicit visibility. |
406 | enum ExplicitVisibilityKind { |
407 | /// Do an LV computation for, ultimately, a type. |
408 | /// Visibility may be restricted by type visibility settings and |
409 | /// the visibility of template arguments. |
410 | VisibilityForType, |
411 | |
412 | /// Do an LV computation for, ultimately, a non-type declaration. |
413 | /// Visibility may be restricted by value visibility settings and |
414 | /// the visibility of template arguments. |
415 | VisibilityForValue |
416 | }; |
417 | |
418 | /// If visibility was explicitly specified for this |
419 | /// declaration, return that visibility. |
420 | Optional<Visibility> |
421 | getExplicitVisibility(ExplicitVisibilityKind kind) const; |
422 | |
423 | /// True if the computed linkage is valid. Used for consistency |
424 | /// checking. Should always return true. |
425 | bool isLinkageValid() const; |
426 | |
427 | /// True if something has required us to compute the linkage |
428 | /// of this declaration. |
429 | /// |
430 | /// Language features which can retroactively change linkage (like a |
431 | /// typedef name for linkage purposes) may need to consider this, |
432 | /// but hopefully only in transitory ways during parsing. |
433 | bool hasLinkageBeenComputed() const { |
434 | return hasCachedLinkage(); |
435 | } |
436 | |
437 | /// Looks through UsingDecls and ObjCCompatibleAliasDecls for |
438 | /// the underlying named decl. |
439 | NamedDecl *getUnderlyingDecl() { |
440 | // Fast-path the common case. |
441 | if (this->getKind() != UsingShadow && |
442 | this->getKind() != ConstructorUsingShadow && |
443 | this->getKind() != ObjCCompatibleAlias && |
444 | this->getKind() != NamespaceAlias) |
445 | return this; |
446 | |
447 | return getUnderlyingDeclImpl(); |
448 | } |
449 | const NamedDecl *getUnderlyingDecl() const { |
450 | return const_cast<NamedDecl*>(this)->getUnderlyingDecl(); |
451 | } |
452 | |
453 | NamedDecl *getMostRecentDecl() { |
454 | return cast<NamedDecl>(static_cast<Decl *>(this)->getMostRecentDecl()); |
455 | } |
456 | const NamedDecl *getMostRecentDecl() const { |
457 | return const_cast<NamedDecl*>(this)->getMostRecentDecl(); |
458 | } |
459 | |
460 | ObjCStringFormatFamily getObjCFStringFormattingFamily() const; |
461 | |
462 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
463 | static bool classofKind(Kind K) { return K >= firstNamed && K <= lastNamed; } |
464 | }; |
465 | |
466 | inline raw_ostream &operator<<(raw_ostream &OS, const NamedDecl &ND) { |
467 | ND.printName(OS); |
468 | return OS; |
469 | } |
470 | |
471 | /// Represents the declaration of a label. Labels also have a |
472 | /// corresponding LabelStmt, which indicates the position that the label was |
473 | /// defined at. For normal labels, the location of the decl is the same as the |
474 | /// location of the statement. For GNU local labels (__label__), the decl |
475 | /// location is where the __label__ is. |
476 | class LabelDecl : public NamedDecl { |
477 | LabelStmt *TheStmt; |
478 | StringRef MSAsmName; |
479 | bool MSAsmNameResolved = false; |
480 | |
481 | /// For normal labels, this is the same as the main declaration |
482 | /// label, i.e., the location of the identifier; for GNU local labels, |
483 | /// this is the location of the __label__ keyword. |
484 | SourceLocation LocStart; |
485 | |
486 | LabelDecl(DeclContext *DC, SourceLocation IdentL, IdentifierInfo *II, |
487 | LabelStmt *S, SourceLocation StartL) |
488 | : NamedDecl(Label, DC, IdentL, II), TheStmt(S), LocStart(StartL) {} |
489 | |
490 | void anchor() override; |
491 | |
492 | public: |
493 | static LabelDecl *Create(ASTContext &C, DeclContext *DC, |
494 | SourceLocation IdentL, IdentifierInfo *II); |
495 | static LabelDecl *Create(ASTContext &C, DeclContext *DC, |
496 | SourceLocation IdentL, IdentifierInfo *II, |
497 | SourceLocation GnuLabelL); |
498 | static LabelDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
499 | |
500 | LabelStmt *getStmt() const { return TheStmt; } |
501 | void setStmt(LabelStmt *T) { TheStmt = T; } |
502 | |
503 | bool isGnuLocal() const { return LocStart != getLocation(); } |
504 | void setLocStart(SourceLocation L) { LocStart = L; } |
505 | |
506 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
507 | return SourceRange(LocStart, getLocation()); |
508 | } |
509 | |
510 | bool isMSAsmLabel() const { return !MSAsmName.empty(); } |
511 | bool isResolvedMSAsmLabel() const { return isMSAsmLabel() && MSAsmNameResolved; } |
512 | void setMSAsmLabel(StringRef Name); |
513 | StringRef getMSAsmLabel() const { return MSAsmName; } |
514 | void setMSAsmLabelResolved() { MSAsmNameResolved = true; } |
515 | |
516 | // Implement isa/cast/dyncast/etc. |
517 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
518 | static bool classofKind(Kind K) { return K == Label; } |
519 | }; |
520 | |
521 | /// Represent a C++ namespace. |
522 | class NamespaceDecl : public NamedDecl, public DeclContext, |
523 | public Redeclarable<NamespaceDecl> |
524 | { |
525 | /// The starting location of the source range, pointing |
526 | /// to either the namespace or the inline keyword. |
527 | SourceLocation LocStart; |
528 | |
529 | /// The ending location of the source range. |
530 | SourceLocation RBraceLoc; |
531 | |
532 | /// A pointer to either the anonymous namespace that lives just inside |
533 | /// this namespace or to the first namespace in the chain (the latter case |
534 | /// only when this is not the first in the chain), along with a |
535 | /// boolean value indicating whether this is an inline namespace. |
536 | llvm::PointerIntPair<NamespaceDecl *, 1, bool> AnonOrFirstNamespaceAndInline; |
537 | |
538 | NamespaceDecl(ASTContext &C, DeclContext *DC, bool Inline, |
539 | SourceLocation StartLoc, SourceLocation IdLoc, |
540 | IdentifierInfo *Id, NamespaceDecl *PrevDecl); |
541 | |
542 | using redeclarable_base = Redeclarable<NamespaceDecl>; |
543 | |
544 | NamespaceDecl *getNextRedeclarationImpl() override; |
545 | NamespaceDecl *getPreviousDeclImpl() override; |
546 | NamespaceDecl *getMostRecentDeclImpl() override; |
547 | |
548 | public: |
549 | friend class ASTDeclReader; |
550 | friend class ASTDeclWriter; |
551 | |
552 | static NamespaceDecl *Create(ASTContext &C, DeclContext *DC, |
553 | bool Inline, SourceLocation StartLoc, |
554 | SourceLocation IdLoc, IdentifierInfo *Id, |
555 | NamespaceDecl *PrevDecl); |
556 | |
557 | static NamespaceDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
558 | |
559 | using redecl_range = redeclarable_base::redecl_range; |
560 | using redecl_iterator = redeclarable_base::redecl_iterator; |
561 | |
562 | using redeclarable_base::redecls_begin; |
563 | using redeclarable_base::redecls_end; |
564 | using redeclarable_base::redecls; |
565 | using redeclarable_base::getPreviousDecl; |
566 | using redeclarable_base::getMostRecentDecl; |
567 | using redeclarable_base::isFirstDecl; |
568 | |
569 | /// Returns true if this is an anonymous namespace declaration. |
570 | /// |
571 | /// For example: |
572 | /// \code |
573 | /// namespace { |
574 | /// ... |
575 | /// }; |
576 | /// \endcode |
577 | /// q.v. C++ [namespace.unnamed] |
578 | bool isAnonymousNamespace() const { |
579 | return !getIdentifier(); |
580 | } |
581 | |
582 | /// Returns true if this is an inline namespace declaration. |
583 | bool isInline() const { |
584 | return AnonOrFirstNamespaceAndInline.getInt(); |
585 | } |
586 | |
587 | /// Set whether this is an inline namespace declaration. |
588 | void setInline(bool Inline) { |
589 | AnonOrFirstNamespaceAndInline.setInt(Inline); |
590 | } |
591 | |
592 | /// Get the original (first) namespace declaration. |
593 | NamespaceDecl *getOriginalNamespace(); |
594 | |
595 | /// Get the original (first) namespace declaration. |
596 | const NamespaceDecl *getOriginalNamespace() const; |
597 | |
598 | /// Return true if this declaration is an original (first) declaration |
599 | /// of the namespace. This is false for non-original (subsequent) namespace |
600 | /// declarations and anonymous namespaces. |
601 | bool isOriginalNamespace() const; |
602 | |
603 | /// Retrieve the anonymous namespace nested inside this namespace, |
604 | /// if any. |
605 | NamespaceDecl *getAnonymousNamespace() const { |
606 | return getOriginalNamespace()->AnonOrFirstNamespaceAndInline.getPointer(); |
607 | } |
608 | |
609 | void setAnonymousNamespace(NamespaceDecl *D) { |
610 | getOriginalNamespace()->AnonOrFirstNamespaceAndInline.setPointer(D); |
611 | } |
612 | |
613 | /// Retrieves the canonical declaration of this namespace. |
614 | NamespaceDecl *getCanonicalDecl() override { |
615 | return getOriginalNamespace(); |
616 | } |
617 | const NamespaceDecl *getCanonicalDecl() const { |
618 | return getOriginalNamespace(); |
619 | } |
620 | |
621 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
622 | return SourceRange(LocStart, RBraceLoc); |
623 | } |
624 | |
625 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LocStart; } |
626 | SourceLocation getRBraceLoc() const { return RBraceLoc; } |
627 | void setLocStart(SourceLocation L) { LocStart = L; } |
628 | void setRBraceLoc(SourceLocation L) { RBraceLoc = L; } |
629 | |
630 | // Implement isa/cast/dyncast/etc. |
631 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
632 | static bool classofKind(Kind K) { return K == Namespace; } |
633 | static DeclContext *castToDeclContext(const NamespaceDecl *D) { |
634 | return static_cast<DeclContext *>(const_cast<NamespaceDecl*>(D)); |
635 | } |
636 | static NamespaceDecl *castFromDeclContext(const DeclContext *DC) { |
637 | return static_cast<NamespaceDecl *>(const_cast<DeclContext*>(DC)); |
638 | } |
639 | }; |
640 | |
641 | /// Represent the declaration of a variable (in which case it is |
642 | /// an lvalue) a function (in which case it is a function designator) or |
643 | /// an enum constant. |
644 | class ValueDecl : public NamedDecl { |
645 | QualType DeclType; |
646 | |
647 | void anchor() override; |
648 | |
649 | protected: |
650 | ValueDecl(Kind DK, DeclContext *DC, SourceLocation L, |
651 | DeclarationName N, QualType T) |
652 | : NamedDecl(DK, DC, L, N), DeclType(T) {} |
653 | |
654 | public: |
655 | QualType getType() const { return DeclType; } |
656 | void setType(QualType newType) { DeclType = newType; } |
657 | |
658 | /// Determine whether this symbol is weakly-imported, |
659 | /// or declared with the weak or weak-ref attr. |
660 | bool isWeak() const; |
661 | |
662 | // Implement isa/cast/dyncast/etc. |
663 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
664 | static bool classofKind(Kind K) { return K >= firstValue && K <= lastValue; } |
665 | }; |
666 | |
667 | /// A struct with extended info about a syntactic |
668 | /// name qualifier, to be used for the case of out-of-line declarations. |
669 | struct QualifierInfo { |
670 | NestedNameSpecifierLoc QualifierLoc; |
671 | |
672 | /// The number of "outer" template parameter lists. |
673 | /// The count includes all of the template parameter lists that were matched |
674 | /// against the template-ids occurring into the NNS and possibly (in the |
675 | /// case of an explicit specialization) a final "template <>". |
676 | unsigned NumTemplParamLists = 0; |
677 | |
678 | /// A new-allocated array of size NumTemplParamLists, |
679 | /// containing pointers to the "outer" template parameter lists. |
680 | /// It includes all of the template parameter lists that were matched |
681 | /// against the template-ids occurring into the NNS and possibly (in the |
682 | /// case of an explicit specialization) a final "template <>". |
683 | TemplateParameterList** TemplParamLists = nullptr; |
684 | |
685 | QualifierInfo() = default; |
686 | QualifierInfo(const QualifierInfo &) = delete; |
687 | QualifierInfo& operator=(const QualifierInfo &) = delete; |
688 | |
689 | /// Sets info about "outer" template parameter lists. |
690 | void setTemplateParameterListsInfo(ASTContext &Context, |
691 | ArrayRef<TemplateParameterList *> TPLists); |
692 | }; |
693 | |
694 | /// Represents a ValueDecl that came out of a declarator. |
695 | /// Contains type source information through TypeSourceInfo. |
696 | class DeclaratorDecl : public ValueDecl { |
697 | // A struct representing both a TInfo and a syntactic qualifier, |
698 | // to be used for the (uncommon) case of out-of-line declarations. |
699 | struct ExtInfo : public QualifierInfo { |
700 | TypeSourceInfo *TInfo; |
701 | }; |
702 | |
703 | llvm::PointerUnion<TypeSourceInfo *, ExtInfo *> DeclInfo; |
704 | |
705 | /// The start of the source range for this declaration, |
706 | /// ignoring outer template declarations. |
707 | SourceLocation InnerLocStart; |
708 | |
709 | bool hasExtInfo() const { return DeclInfo.is<ExtInfo*>(); } |
710 | ExtInfo *getExtInfo() { return DeclInfo.get<ExtInfo*>(); } |
711 | const ExtInfo *getExtInfo() const { return DeclInfo.get<ExtInfo*>(); } |
712 | |
713 | protected: |
714 | DeclaratorDecl(Kind DK, DeclContext *DC, SourceLocation L, |
715 | DeclarationName N, QualType T, TypeSourceInfo *TInfo, |
716 | SourceLocation StartL) |
717 | : ValueDecl(DK, DC, L, N, T), DeclInfo(TInfo), InnerLocStart(StartL) {} |
718 | |
719 | public: |
720 | friend class ASTDeclReader; |
721 | friend class ASTDeclWriter; |
722 | |
723 | TypeSourceInfo *getTypeSourceInfo() const { |
724 | return hasExtInfo() |
725 | ? getExtInfo()->TInfo |
726 | : DeclInfo.get<TypeSourceInfo*>(); |
727 | } |
728 | |
729 | void setTypeSourceInfo(TypeSourceInfo *TI) { |
730 | if (hasExtInfo()) |
731 | getExtInfo()->TInfo = TI; |
732 | else |
733 | DeclInfo = TI; |
734 | } |
735 | |
736 | /// Return start of source range ignoring outer template declarations. |
737 | SourceLocation getInnerLocStart() const { return InnerLocStart; } |
738 | void setInnerLocStart(SourceLocation L) { InnerLocStart = L; } |
739 | |
740 | /// Return start of source range taking into account any outer template |
741 | /// declarations. |
742 | SourceLocation getOuterLocStart() const; |
743 | |
744 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
745 | |
746 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { |
747 | return getOuterLocStart(); |
748 | } |
749 | |
750 | /// Retrieve the nested-name-specifier that qualifies the name of this |
751 | /// declaration, if it was present in the source. |
752 | NestedNameSpecifier *getQualifier() const { |
753 | return hasExtInfo() ? getExtInfo()->QualifierLoc.getNestedNameSpecifier() |
754 | : nullptr; |
755 | } |
756 | |
757 | /// Retrieve the nested-name-specifier (with source-location |
758 | /// information) that qualifies the name of this declaration, if it was |
759 | /// present in the source. |
760 | NestedNameSpecifierLoc getQualifierLoc() const { |
761 | return hasExtInfo() ? getExtInfo()->QualifierLoc |
762 | : NestedNameSpecifierLoc(); |
763 | } |
764 | |
765 | void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc); |
766 | |
767 | unsigned getNumTemplateParameterLists() const { |
768 | return hasExtInfo() ? getExtInfo()->NumTemplParamLists : 0; |
769 | } |
770 | |
771 | TemplateParameterList *getTemplateParameterList(unsigned index) const { |
772 | assert(index < getNumTemplateParameterLists())((index < getNumTemplateParameterLists()) ? static_cast< void> (0) : __assert_fail ("index < getNumTemplateParameterLists()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 772, __PRETTY_FUNCTION__)); |
773 | return getExtInfo()->TemplParamLists[index]; |
774 | } |
775 | |
776 | void setTemplateParameterListsInfo(ASTContext &Context, |
777 | ArrayRef<TemplateParameterList *> TPLists); |
778 | |
779 | SourceLocation getTypeSpecStartLoc() const; |
780 | |
781 | // Implement isa/cast/dyncast/etc. |
782 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
783 | static bool classofKind(Kind K) { |
784 | return K >= firstDeclarator && K <= lastDeclarator; |
785 | } |
786 | }; |
787 | |
788 | /// Structure used to store a statement, the constant value to |
789 | /// which it was evaluated (if any), and whether or not the statement |
790 | /// is an integral constant expression (if known). |
791 | struct EvaluatedStmt { |
792 | /// Whether this statement was already evaluated. |
793 | bool WasEvaluated : 1; |
794 | |
795 | /// Whether this statement is being evaluated. |
796 | bool IsEvaluating : 1; |
797 | |
798 | /// Whether we already checked whether this statement was an |
799 | /// integral constant expression. |
800 | bool CheckedICE : 1; |
801 | |
802 | /// Whether we are checking whether this statement is an |
803 | /// integral constant expression. |
804 | bool CheckingICE : 1; |
805 | |
806 | /// Whether this statement is an integral constant expression, |
807 | /// or in C++11, whether the statement is a constant expression. Only |
808 | /// valid if CheckedICE is true. |
809 | bool IsICE : 1; |
810 | |
811 | /// Whether this variable is known to have constant destruction. That is, |
812 | /// whether running the destructor on the initial value is a side-effect |
813 | /// (and doesn't inspect any state that might have changed during program |
814 | /// execution). This is currently only computed if the destructor is |
815 | /// non-trivial. |
816 | bool HasConstantDestruction : 1; |
817 | |
818 | Stmt *Value; |
819 | APValue Evaluated; |
820 | |
821 | EvaluatedStmt() |
822 | : WasEvaluated(false), IsEvaluating(false), CheckedICE(false), |
823 | CheckingICE(false), IsICE(false), HasConstantDestruction(false) {} |
824 | }; |
825 | |
826 | /// Represents a variable declaration or definition. |
827 | class VarDecl : public DeclaratorDecl, public Redeclarable<VarDecl> { |
828 | public: |
829 | /// Initialization styles. |
830 | enum InitializationStyle { |
831 | /// C-style initialization with assignment |
832 | CInit, |
833 | |
834 | /// Call-style initialization (C++98) |
835 | CallInit, |
836 | |
837 | /// Direct list-initialization (C++11) |
838 | ListInit |
839 | }; |
840 | |
841 | /// Kinds of thread-local storage. |
842 | enum TLSKind { |
843 | /// Not a TLS variable. |
844 | TLS_None, |
845 | |
846 | /// TLS with a known-constant initializer. |
847 | TLS_Static, |
848 | |
849 | /// TLS with a dynamic initializer. |
850 | TLS_Dynamic |
851 | }; |
852 | |
853 | /// Return the string used to specify the storage class \p SC. |
854 | /// |
855 | /// It is illegal to call this function with SC == None. |
856 | static const char *getStorageClassSpecifierString(StorageClass SC); |
857 | |
858 | protected: |
859 | // A pointer union of Stmt * and EvaluatedStmt *. When an EvaluatedStmt, we |
860 | // have allocated the auxiliary struct of information there. |
861 | // |
862 | // TODO: It is a bit unfortunate to use a PointerUnion inside the VarDecl for |
863 | // this as *many* VarDecls are ParmVarDecls that don't have default |
864 | // arguments. We could save some space by moving this pointer union to be |
865 | // allocated in trailing space when necessary. |
866 | using InitType = llvm::PointerUnion<Stmt *, EvaluatedStmt *>; |
867 | |
868 | /// The initializer for this variable or, for a ParmVarDecl, the |
869 | /// C++ default argument. |
870 | mutable InitType Init; |
871 | |
872 | private: |
873 | friend class ASTDeclReader; |
874 | friend class ASTNodeImporter; |
875 | friend class StmtIteratorBase; |
876 | |
877 | class VarDeclBitfields { |
878 | friend class ASTDeclReader; |
879 | friend class VarDecl; |
880 | |
881 | unsigned SClass : 3; |
882 | unsigned TSCSpec : 2; |
883 | unsigned InitStyle : 2; |
884 | |
885 | /// Whether this variable is an ARC pseudo-__strong variable; see |
886 | /// isARCPseudoStrong() for details. |
887 | unsigned ARCPseudoStrong : 1; |
888 | }; |
889 | enum { NumVarDeclBits = 8 }; |
890 | |
891 | protected: |
892 | enum { NumParameterIndexBits = 8 }; |
893 | |
894 | enum DefaultArgKind { |
895 | DAK_None, |
896 | DAK_Unparsed, |
897 | DAK_Uninstantiated, |
898 | DAK_Normal |
899 | }; |
900 | |
901 | class ParmVarDeclBitfields { |
902 | friend class ASTDeclReader; |
903 | friend class ParmVarDecl; |
904 | |
905 | unsigned : NumVarDeclBits; |
906 | |
907 | /// Whether this parameter inherits a default argument from a |
908 | /// prior declaration. |
909 | unsigned HasInheritedDefaultArg : 1; |
910 | |
911 | /// Describes the kind of default argument for this parameter. By default |
912 | /// this is none. If this is normal, then the default argument is stored in |
913 | /// the \c VarDecl initializer expression unless we were unable to parse |
914 | /// (even an invalid) expression for the default argument. |
915 | unsigned DefaultArgKind : 2; |
916 | |
917 | /// Whether this parameter undergoes K&R argument promotion. |
918 | unsigned IsKNRPromoted : 1; |
919 | |
920 | /// Whether this parameter is an ObjC method parameter or not. |
921 | unsigned IsObjCMethodParam : 1; |
922 | |
923 | /// If IsObjCMethodParam, a Decl::ObjCDeclQualifier. |
924 | /// Otherwise, the number of function parameter scopes enclosing |
925 | /// the function parameter scope in which this parameter was |
926 | /// declared. |
927 | unsigned ScopeDepthOrObjCQuals : 7; |
928 | |
929 | /// The number of parameters preceding this parameter in the |
930 | /// function parameter scope in which it was declared. |
931 | unsigned ParameterIndex : NumParameterIndexBits; |
932 | }; |
933 | |
934 | class NonParmVarDeclBitfields { |
935 | friend class ASTDeclReader; |
936 | friend class ImplicitParamDecl; |
937 | friend class VarDecl; |
938 | |
939 | unsigned : NumVarDeclBits; |
940 | |
941 | // FIXME: We need something similar to CXXRecordDecl::DefinitionData. |
942 | /// Whether this variable is a definition which was demoted due to |
943 | /// module merge. |
944 | unsigned IsThisDeclarationADemotedDefinition : 1; |
945 | |
946 | /// Whether this variable is the exception variable in a C++ catch |
947 | /// or an Objective-C @catch statement. |
948 | unsigned ExceptionVar : 1; |
949 | |
950 | /// Whether this local variable could be allocated in the return |
951 | /// slot of its function, enabling the named return value optimization |
952 | /// (NRVO). |
953 | unsigned NRVOVariable : 1; |
954 | |
955 | /// Whether this variable is the for-range-declaration in a C++0x |
956 | /// for-range statement. |
957 | unsigned CXXForRangeDecl : 1; |
958 | |
959 | /// Whether this variable is the for-in loop declaration in Objective-C. |
960 | unsigned ObjCForDecl : 1; |
961 | |
962 | /// Whether this variable is (C++1z) inline. |
963 | unsigned IsInline : 1; |
964 | |
965 | /// Whether this variable has (C++1z) inline explicitly specified. |
966 | unsigned IsInlineSpecified : 1; |
967 | |
968 | /// Whether this variable is (C++0x) constexpr. |
969 | unsigned IsConstexpr : 1; |
970 | |
971 | /// Whether this variable is the implicit variable for a lambda |
972 | /// init-capture. |
973 | unsigned IsInitCapture : 1; |
974 | |
975 | /// Whether this local extern variable's previous declaration was |
976 | /// declared in the same block scope. This controls whether we should merge |
977 | /// the type of this declaration with its previous declaration. |
978 | unsigned PreviousDeclInSameBlockScope : 1; |
979 | |
980 | /// Defines kind of the ImplicitParamDecl: 'this', 'self', 'vtt', '_cmd' or |
981 | /// something else. |
982 | unsigned ImplicitParamKind : 3; |
983 | |
984 | unsigned EscapingByref : 1; |
985 | }; |
986 | |
987 | union { |
988 | unsigned AllBits; |
989 | VarDeclBitfields VarDeclBits; |
990 | ParmVarDeclBitfields ParmVarDeclBits; |
991 | NonParmVarDeclBitfields NonParmVarDeclBits; |
992 | }; |
993 | |
994 | VarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
995 | SourceLocation IdLoc, IdentifierInfo *Id, QualType T, |
996 | TypeSourceInfo *TInfo, StorageClass SC); |
997 | |
998 | using redeclarable_base = Redeclarable<VarDecl>; |
999 | |
1000 | VarDecl *getNextRedeclarationImpl() override { |
1001 | return getNextRedeclaration(); |
1002 | } |
1003 | |
1004 | VarDecl *getPreviousDeclImpl() override { |
1005 | return getPreviousDecl(); |
1006 | } |
1007 | |
1008 | VarDecl *getMostRecentDeclImpl() override { |
1009 | return getMostRecentDecl(); |
1010 | } |
1011 | |
1012 | public: |
1013 | using redecl_range = redeclarable_base::redecl_range; |
1014 | using redecl_iterator = redeclarable_base::redecl_iterator; |
1015 | |
1016 | using redeclarable_base::redecls_begin; |
1017 | using redeclarable_base::redecls_end; |
1018 | using redeclarable_base::redecls; |
1019 | using redeclarable_base::getPreviousDecl; |
1020 | using redeclarable_base::getMostRecentDecl; |
1021 | using redeclarable_base::isFirstDecl; |
1022 | |
1023 | static VarDecl *Create(ASTContext &C, DeclContext *DC, |
1024 | SourceLocation StartLoc, SourceLocation IdLoc, |
1025 | IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, |
1026 | StorageClass S); |
1027 | |
1028 | static VarDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1029 | |
1030 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
1031 | |
1032 | /// Returns the storage class as written in the source. For the |
1033 | /// computed linkage of symbol, see getLinkage. |
1034 | StorageClass getStorageClass() const { |
1035 | return (StorageClass) VarDeclBits.SClass; |
1036 | } |
1037 | void setStorageClass(StorageClass SC); |
1038 | |
1039 | void setTSCSpec(ThreadStorageClassSpecifier TSC) { |
1040 | VarDeclBits.TSCSpec = TSC; |
1041 | assert(VarDeclBits.TSCSpec == TSC && "truncation")((VarDeclBits.TSCSpec == TSC && "truncation") ? static_cast <void> (0) : __assert_fail ("VarDeclBits.TSCSpec == TSC && \"truncation\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1041, __PRETTY_FUNCTION__)); |
1042 | } |
1043 | ThreadStorageClassSpecifier getTSCSpec() const { |
1044 | return static_cast<ThreadStorageClassSpecifier>(VarDeclBits.TSCSpec); |
1045 | } |
1046 | TLSKind getTLSKind() const; |
1047 | |
1048 | /// Returns true if a variable with function scope is a non-static local |
1049 | /// variable. |
1050 | bool hasLocalStorage() const { |
1051 | if (getStorageClass() == SC_None) { |
1052 | // OpenCL v1.2 s6.5.3: The __constant or constant address space name is |
1053 | // used to describe variables allocated in global memory and which are |
1054 | // accessed inside a kernel(s) as read-only variables. As such, variables |
1055 | // in constant address space cannot have local storage. |
1056 | if (getType().getAddressSpace() == LangAS::opencl_constant) |
1057 | return false; |
1058 | // Second check is for C++11 [dcl.stc]p4. |
1059 | return !isFileVarDecl() && getTSCSpec() == TSCS_unspecified; |
1060 | } |
1061 | |
1062 | // Global Named Register (GNU extension) |
1063 | if (getStorageClass() == SC_Register && !isLocalVarDeclOrParm()) |
1064 | return false; |
1065 | |
1066 | // Return true for: Auto, Register. |
1067 | // Return false for: Extern, Static, PrivateExtern, OpenCLWorkGroupLocal. |
1068 | |
1069 | return getStorageClass() >= SC_Auto; |
1070 | } |
1071 | |
1072 | /// Returns true if a variable with function scope is a static local |
1073 | /// variable. |
1074 | bool isStaticLocal() const { |
1075 | return (getStorageClass() == SC_Static || |
1076 | // C++11 [dcl.stc]p4 |
1077 | (getStorageClass() == SC_None && getTSCSpec() == TSCS_thread_local)) |
1078 | && !isFileVarDecl(); |
1079 | } |
1080 | |
1081 | /// Returns true if a variable has extern or __private_extern__ |
1082 | /// storage. |
1083 | bool hasExternalStorage() const { |
1084 | return getStorageClass() == SC_Extern || |
1085 | getStorageClass() == SC_PrivateExtern; |
1086 | } |
1087 | |
1088 | /// Returns true for all variables that do not have local storage. |
1089 | /// |
1090 | /// This includes all global variables as well as static variables declared |
1091 | /// within a function. |
1092 | bool hasGlobalStorage() const { return !hasLocalStorage(); } |
1093 | |
1094 | /// Get the storage duration of this variable, per C++ [basic.stc]. |
1095 | StorageDuration getStorageDuration() const { |
1096 | return hasLocalStorage() ? SD_Automatic : |
1097 | getTSCSpec() ? SD_Thread : SD_Static; |
1098 | } |
1099 | |
1100 | /// Compute the language linkage. |
1101 | LanguageLinkage getLanguageLinkage() const; |
1102 | |
1103 | /// Determines whether this variable is a variable with external, C linkage. |
1104 | bool isExternC() const; |
1105 | |
1106 | /// Determines whether this variable's context is, or is nested within, |
1107 | /// a C++ extern "C" linkage spec. |
1108 | bool isInExternCContext() const; |
1109 | |
1110 | /// Determines whether this variable's context is, or is nested within, |
1111 | /// a C++ extern "C++" linkage spec. |
1112 | bool isInExternCXXContext() const; |
1113 | |
1114 | /// Returns true for local variable declarations other than parameters. |
1115 | /// Note that this includes static variables inside of functions. It also |
1116 | /// includes variables inside blocks. |
1117 | /// |
1118 | /// void foo() { int x; static int y; extern int z; } |
1119 | bool isLocalVarDecl() const { |
1120 | if (getKind() != Decl::Var && getKind() != Decl::Decomposition) |
1121 | return false; |
1122 | if (const DeclContext *DC = getLexicalDeclContext()) |
1123 | return DC->getRedeclContext()->isFunctionOrMethod(); |
1124 | return false; |
1125 | } |
1126 | |
1127 | /// Similar to isLocalVarDecl but also includes parameters. |
1128 | bool isLocalVarDeclOrParm() const { |
1129 | return isLocalVarDecl() || getKind() == Decl::ParmVar; |
1130 | } |
1131 | |
1132 | /// Similar to isLocalVarDecl, but excludes variables declared in blocks. |
1133 | bool isFunctionOrMethodVarDecl() const { |
1134 | if (getKind() != Decl::Var && getKind() != Decl::Decomposition) |
1135 | return false; |
1136 | const DeclContext *DC = getLexicalDeclContext()->getRedeclContext(); |
1137 | return DC->isFunctionOrMethod() && DC->getDeclKind() != Decl::Block; |
1138 | } |
1139 | |
1140 | /// Determines whether this is a static data member. |
1141 | /// |
1142 | /// This will only be true in C++, and applies to, e.g., the |
1143 | /// variable 'x' in: |
1144 | /// \code |
1145 | /// struct S { |
1146 | /// static int x; |
1147 | /// }; |
1148 | /// \endcode |
1149 | bool isStaticDataMember() const { |
1150 | // If it wasn't static, it would be a FieldDecl. |
1151 | return getKind() != Decl::ParmVar && getDeclContext()->isRecord(); |
1152 | } |
1153 | |
1154 | VarDecl *getCanonicalDecl() override; |
1155 | const VarDecl *getCanonicalDecl() const { |
1156 | return const_cast<VarDecl*>(this)->getCanonicalDecl(); |
1157 | } |
1158 | |
1159 | enum DefinitionKind { |
1160 | /// This declaration is only a declaration. |
1161 | DeclarationOnly, |
1162 | |
1163 | /// This declaration is a tentative definition. |
1164 | TentativeDefinition, |
1165 | |
1166 | /// This declaration is definitely a definition. |
1167 | Definition |
1168 | }; |
1169 | |
1170 | /// Check whether this declaration is a definition. If this could be |
1171 | /// a tentative definition (in C), don't check whether there's an overriding |
1172 | /// definition. |
1173 | DefinitionKind isThisDeclarationADefinition(ASTContext &) const; |
1174 | DefinitionKind isThisDeclarationADefinition() const { |
1175 | return isThisDeclarationADefinition(getASTContext()); |
1176 | } |
1177 | |
1178 | /// Check whether this variable is defined in this translation unit. |
1179 | DefinitionKind hasDefinition(ASTContext &) const; |
1180 | DefinitionKind hasDefinition() const { |
1181 | return hasDefinition(getASTContext()); |
1182 | } |
1183 | |
1184 | /// Get the tentative definition that acts as the real definition in a TU. |
1185 | /// Returns null if there is a proper definition available. |
1186 | VarDecl *getActingDefinition(); |
1187 | const VarDecl *getActingDefinition() const { |
1188 | return const_cast<VarDecl*>(this)->getActingDefinition(); |
1189 | } |
1190 | |
1191 | /// Get the real (not just tentative) definition for this declaration. |
1192 | VarDecl *getDefinition(ASTContext &); |
1193 | const VarDecl *getDefinition(ASTContext &C) const { |
1194 | return const_cast<VarDecl*>(this)->getDefinition(C); |
1195 | } |
1196 | VarDecl *getDefinition() { |
1197 | return getDefinition(getASTContext()); |
1198 | } |
1199 | const VarDecl *getDefinition() const { |
1200 | return const_cast<VarDecl*>(this)->getDefinition(); |
1201 | } |
1202 | |
1203 | /// Determine whether this is or was instantiated from an out-of-line |
1204 | /// definition of a static data member. |
1205 | bool isOutOfLine() const override; |
1206 | |
1207 | /// Returns true for file scoped variable declaration. |
1208 | bool isFileVarDecl() const { |
1209 | Kind K = getKind(); |
1210 | if (K == ParmVar || K == ImplicitParam) |
1211 | return false; |
1212 | |
1213 | if (getLexicalDeclContext()->getRedeclContext()->isFileContext()) |
1214 | return true; |
1215 | |
1216 | if (isStaticDataMember()) |
1217 | return true; |
1218 | |
1219 | return false; |
1220 | } |
1221 | |
1222 | /// Get the initializer for this variable, no matter which |
1223 | /// declaration it is attached to. |
1224 | const Expr *getAnyInitializer() const { |
1225 | const VarDecl *D; |
1226 | return getAnyInitializer(D); |
1227 | } |
1228 | |
1229 | /// Get the initializer for this variable, no matter which |
1230 | /// declaration it is attached to. Also get that declaration. |
1231 | const Expr *getAnyInitializer(const VarDecl *&D) const; |
1232 | |
1233 | bool hasInit() const; |
1234 | const Expr *getInit() const { |
1235 | return const_cast<VarDecl *>(this)->getInit(); |
1236 | } |
1237 | Expr *getInit(); |
1238 | |
1239 | /// Retrieve the address of the initializer expression. |
1240 | Stmt **getInitAddress(); |
1241 | |
1242 | void setInit(Expr *I); |
1243 | |
1244 | /// Get the initializing declaration of this variable, if any. This is |
1245 | /// usually the definition, except that for a static data member it can be |
1246 | /// the in-class declaration. |
1247 | VarDecl *getInitializingDeclaration(); |
1248 | const VarDecl *getInitializingDeclaration() const { |
1249 | return const_cast<VarDecl *>(this)->getInitializingDeclaration(); |
1250 | } |
1251 | |
1252 | /// Determine whether this variable's value might be usable in a |
1253 | /// constant expression, according to the relevant language standard. |
1254 | /// This only checks properties of the declaration, and does not check |
1255 | /// whether the initializer is in fact a constant expression. |
1256 | bool mightBeUsableInConstantExpressions(ASTContext &C) const; |
1257 | |
1258 | /// Determine whether this variable's value can be used in a |
1259 | /// constant expression, according to the relevant language standard, |
1260 | /// including checking whether it was initialized by a constant expression. |
1261 | bool isUsableInConstantExpressions(ASTContext &C) const; |
1262 | |
1263 | EvaluatedStmt *ensureEvaluatedStmt() const; |
1264 | |
1265 | /// Attempt to evaluate the value of the initializer attached to this |
1266 | /// declaration, and produce notes explaining why it cannot be evaluated or is |
1267 | /// not a constant expression. Returns a pointer to the value if evaluation |
1268 | /// succeeded, 0 otherwise. |
1269 | APValue *evaluateValue() const; |
1270 | APValue *evaluateValue(SmallVectorImpl<PartialDiagnosticAt> &Notes) const; |
1271 | |
1272 | /// Return the already-evaluated value of this variable's |
1273 | /// initializer, or NULL if the value is not yet known. Returns pointer |
1274 | /// to untyped APValue if the value could not be evaluated. |
1275 | APValue *getEvaluatedValue() const; |
1276 | |
1277 | /// Evaluate the destruction of this variable to determine if it constitutes |
1278 | /// constant destruction. |
1279 | /// |
1280 | /// \pre isInitICE() |
1281 | /// \return \c true if this variable has constant destruction, \c false if |
1282 | /// not. |
1283 | bool evaluateDestruction(SmallVectorImpl<PartialDiagnosticAt> &Notes) const; |
1284 | |
1285 | /// Determines whether it is already known whether the |
1286 | /// initializer is an integral constant expression or not. |
1287 | bool isInitKnownICE() const; |
1288 | |
1289 | /// Determines whether the initializer is an integral constant |
1290 | /// expression, or in C++11, whether the initializer is a constant |
1291 | /// expression. |
1292 | /// |
1293 | /// \pre isInitKnownICE() |
1294 | bool isInitICE() const; |
1295 | |
1296 | /// Determine whether the value of the initializer attached to this |
1297 | /// declaration is an integral constant expression. |
1298 | bool checkInitIsICE() const; |
1299 | |
1300 | void setInitStyle(InitializationStyle Style) { |
1301 | VarDeclBits.InitStyle = Style; |
1302 | } |
1303 | |
1304 | /// The style of initialization for this declaration. |
1305 | /// |
1306 | /// C-style initialization is "int x = 1;". Call-style initialization is |
1307 | /// a C++98 direct-initializer, e.g. "int x(1);". The Init expression will be |
1308 | /// the expression inside the parens or a "ClassType(a,b,c)" class constructor |
1309 | /// expression for class types. List-style initialization is C++11 syntax, |
1310 | /// e.g. "int x{1};". Clients can distinguish between different forms of |
1311 | /// initialization by checking this value. In particular, "int x = {1};" is |
1312 | /// C-style, "int x({1})" is call-style, and "int x{1};" is list-style; the |
1313 | /// Init expression in all three cases is an InitListExpr. |
1314 | InitializationStyle getInitStyle() const { |
1315 | return static_cast<InitializationStyle>(VarDeclBits.InitStyle); |
1316 | } |
1317 | |
1318 | /// Whether the initializer is a direct-initializer (list or call). |
1319 | bool isDirectInit() const { |
1320 | return getInitStyle() != CInit; |
1321 | } |
1322 | |
1323 | /// If this definition should pretend to be a declaration. |
1324 | bool isThisDeclarationADemotedDefinition() const { |
1325 | return isa<ParmVarDecl>(this) ? false : |
1326 | NonParmVarDeclBits.IsThisDeclarationADemotedDefinition; |
1327 | } |
1328 | |
1329 | /// This is a definition which should be demoted to a declaration. |
1330 | /// |
1331 | /// In some cases (mostly module merging) we can end up with two visible |
1332 | /// definitions one of which needs to be demoted to a declaration to keep |
1333 | /// the AST invariants. |
1334 | void demoteThisDefinitionToDeclaration() { |
1335 | assert(isThisDeclarationADefinition() && "Not a definition!")((isThisDeclarationADefinition() && "Not a definition!" ) ? static_cast<void> (0) : __assert_fail ("isThisDeclarationADefinition() && \"Not a definition!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1335, __PRETTY_FUNCTION__)); |
1336 | assert(!isa<ParmVarDecl>(this) && "Cannot demote ParmVarDecls!")((!isa<ParmVarDecl>(this) && "Cannot demote ParmVarDecls!" ) ? static_cast<void> (0) : __assert_fail ("!isa<ParmVarDecl>(this) && \"Cannot demote ParmVarDecls!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1336, __PRETTY_FUNCTION__)); |
1337 | NonParmVarDeclBits.IsThisDeclarationADemotedDefinition = 1; |
1338 | } |
1339 | |
1340 | /// Determine whether this variable is the exception variable in a |
1341 | /// C++ catch statememt or an Objective-C \@catch statement. |
1342 | bool isExceptionVariable() const { |
1343 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.ExceptionVar; |
1344 | } |
1345 | void setExceptionVariable(bool EV) { |
1346 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1346, __PRETTY_FUNCTION__)); |
1347 | NonParmVarDeclBits.ExceptionVar = EV; |
1348 | } |
1349 | |
1350 | /// Determine whether this local variable can be used with the named |
1351 | /// return value optimization (NRVO). |
1352 | /// |
1353 | /// The named return value optimization (NRVO) works by marking certain |
1354 | /// non-volatile local variables of class type as NRVO objects. These |
1355 | /// locals can be allocated within the return slot of their containing |
1356 | /// function, in which case there is no need to copy the object to the |
1357 | /// return slot when returning from the function. Within the function body, |
1358 | /// each return that returns the NRVO object will have this variable as its |
1359 | /// NRVO candidate. |
1360 | bool isNRVOVariable() const { |
1361 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.NRVOVariable; |
1362 | } |
1363 | void setNRVOVariable(bool NRVO) { |
1364 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1364, __PRETTY_FUNCTION__)); |
1365 | NonParmVarDeclBits.NRVOVariable = NRVO; |
1366 | } |
1367 | |
1368 | /// Determine whether this variable is the for-range-declaration in |
1369 | /// a C++0x for-range statement. |
1370 | bool isCXXForRangeDecl() const { |
1371 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.CXXForRangeDecl; |
1372 | } |
1373 | void setCXXForRangeDecl(bool FRD) { |
1374 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1374, __PRETTY_FUNCTION__)); |
1375 | NonParmVarDeclBits.CXXForRangeDecl = FRD; |
1376 | } |
1377 | |
1378 | /// Determine whether this variable is a for-loop declaration for a |
1379 | /// for-in statement in Objective-C. |
1380 | bool isObjCForDecl() const { |
1381 | return NonParmVarDeclBits.ObjCForDecl; |
1382 | } |
1383 | |
1384 | void setObjCForDecl(bool FRD) { |
1385 | NonParmVarDeclBits.ObjCForDecl = FRD; |
1386 | } |
1387 | |
1388 | /// Determine whether this variable is an ARC pseudo-__strong variable. A |
1389 | /// pseudo-__strong variable has a __strong-qualified type but does not |
1390 | /// actually retain the object written into it. Generally such variables are |
1391 | /// also 'const' for safety. There are 3 cases where this will be set, 1) if |
1392 | /// the variable is annotated with the objc_externally_retained attribute, 2) |
1393 | /// if its 'self' in a non-init method, or 3) if its the variable in an for-in |
1394 | /// loop. |
1395 | bool isARCPseudoStrong() const { return VarDeclBits.ARCPseudoStrong; } |
1396 | void setARCPseudoStrong(bool PS) { VarDeclBits.ARCPseudoStrong = PS; } |
1397 | |
1398 | /// Whether this variable is (C++1z) inline. |
1399 | bool isInline() const { |
1400 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInline; |
1401 | } |
1402 | bool isInlineSpecified() const { |
1403 | return isa<ParmVarDecl>(this) ? false |
1404 | : NonParmVarDeclBits.IsInlineSpecified; |
1405 | } |
1406 | void setInlineSpecified() { |
1407 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1407, __PRETTY_FUNCTION__)); |
1408 | NonParmVarDeclBits.IsInline = true; |
1409 | NonParmVarDeclBits.IsInlineSpecified = true; |
1410 | } |
1411 | void setImplicitlyInline() { |
1412 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1412, __PRETTY_FUNCTION__)); |
1413 | NonParmVarDeclBits.IsInline = true; |
1414 | } |
1415 | |
1416 | /// Whether this variable is (C++11) constexpr. |
1417 | bool isConstexpr() const { |
1418 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsConstexpr; |
1419 | } |
1420 | void setConstexpr(bool IC) { |
1421 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1421, __PRETTY_FUNCTION__)); |
1422 | NonParmVarDeclBits.IsConstexpr = IC; |
1423 | } |
1424 | |
1425 | /// Whether this variable is the implicit variable for a lambda init-capture. |
1426 | bool isInitCapture() const { |
1427 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInitCapture; |
1428 | } |
1429 | void setInitCapture(bool IC) { |
1430 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1430, __PRETTY_FUNCTION__)); |
1431 | NonParmVarDeclBits.IsInitCapture = IC; |
1432 | } |
1433 | |
1434 | /// Determine whether this variable is actually a function parameter pack or |
1435 | /// init-capture pack. |
1436 | bool isParameterPack() const; |
1437 | |
1438 | /// Whether this local extern variable declaration's previous declaration |
1439 | /// was declared in the same block scope. Only correct in C++. |
1440 | bool isPreviousDeclInSameBlockScope() const { |
1441 | return isa<ParmVarDecl>(this) |
1442 | ? false |
1443 | : NonParmVarDeclBits.PreviousDeclInSameBlockScope; |
1444 | } |
1445 | void setPreviousDeclInSameBlockScope(bool Same) { |
1446 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1446, __PRETTY_FUNCTION__)); |
1447 | NonParmVarDeclBits.PreviousDeclInSameBlockScope = Same; |
1448 | } |
1449 | |
1450 | /// Indicates the capture is a __block variable that is captured by a block |
1451 | /// that can potentially escape (a block for which BlockDecl::doesNotEscape |
1452 | /// returns false). |
1453 | bool isEscapingByref() const; |
1454 | |
1455 | /// Indicates the capture is a __block variable that is never captured by an |
1456 | /// escaping block. |
1457 | bool isNonEscapingByref() const; |
1458 | |
1459 | void setEscapingByref() { |
1460 | NonParmVarDeclBits.EscapingByref = true; |
1461 | } |
1462 | |
1463 | /// Retrieve the variable declaration from which this variable could |
1464 | /// be instantiated, if it is an instantiation (rather than a non-template). |
1465 | VarDecl *getTemplateInstantiationPattern() const; |
1466 | |
1467 | /// If this variable is an instantiated static data member of a |
1468 | /// class template specialization, returns the templated static data member |
1469 | /// from which it was instantiated. |
1470 | VarDecl *getInstantiatedFromStaticDataMember() const; |
1471 | |
1472 | /// If this variable is an instantiation of a variable template or a |
1473 | /// static data member of a class template, determine what kind of |
1474 | /// template specialization or instantiation this is. |
1475 | TemplateSpecializationKind getTemplateSpecializationKind() const; |
1476 | |
1477 | /// Get the template specialization kind of this variable for the purposes of |
1478 | /// template instantiation. This differs from getTemplateSpecializationKind() |
1479 | /// for an instantiation of a class-scope explicit specialization. |
1480 | TemplateSpecializationKind |
1481 | getTemplateSpecializationKindForInstantiation() const; |
1482 | |
1483 | /// If this variable is an instantiation of a variable template or a |
1484 | /// static data member of a class template, determine its point of |
1485 | /// instantiation. |
1486 | SourceLocation getPointOfInstantiation() const; |
1487 | |
1488 | /// If this variable is an instantiation of a static data member of a |
1489 | /// class template specialization, retrieves the member specialization |
1490 | /// information. |
1491 | MemberSpecializationInfo *getMemberSpecializationInfo() const; |
1492 | |
1493 | /// For a static data member that was instantiated from a static |
1494 | /// data member of a class template, set the template specialiation kind. |
1495 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK, |
1496 | SourceLocation PointOfInstantiation = SourceLocation()); |
1497 | |
1498 | /// Specify that this variable is an instantiation of the |
1499 | /// static data member VD. |
1500 | void setInstantiationOfStaticDataMember(VarDecl *VD, |
1501 | TemplateSpecializationKind TSK); |
1502 | |
1503 | /// Retrieves the variable template that is described by this |
1504 | /// variable declaration. |
1505 | /// |
1506 | /// Every variable template is represented as a VarTemplateDecl and a |
1507 | /// VarDecl. The former contains template properties (such as |
1508 | /// the template parameter lists) while the latter contains the |
1509 | /// actual description of the template's |
1510 | /// contents. VarTemplateDecl::getTemplatedDecl() retrieves the |
1511 | /// VarDecl that from a VarTemplateDecl, while |
1512 | /// getDescribedVarTemplate() retrieves the VarTemplateDecl from |
1513 | /// a VarDecl. |
1514 | VarTemplateDecl *getDescribedVarTemplate() const; |
1515 | |
1516 | void setDescribedVarTemplate(VarTemplateDecl *Template); |
1517 | |
1518 | // Is this variable known to have a definition somewhere in the complete |
1519 | // program? This may be true even if the declaration has internal linkage and |
1520 | // has no definition within this source file. |
1521 | bool isKnownToBeDefined() const; |
1522 | |
1523 | /// Is destruction of this variable entirely suppressed? If so, the variable |
1524 | /// need not have a usable destructor at all. |
1525 | bool isNoDestroy(const ASTContext &) const; |
1526 | |
1527 | /// Do we need to emit an exit-time destructor for this variable, and if so, |
1528 | /// what kind? |
1529 | QualType::DestructionKind needsDestruction(const ASTContext &Ctx) const; |
1530 | |
1531 | // Implement isa/cast/dyncast/etc. |
1532 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
1533 | static bool classofKind(Kind K) { return K >= firstVar && K <= lastVar; } |
1534 | }; |
1535 | |
1536 | class ImplicitParamDecl : public VarDecl { |
1537 | void anchor() override; |
1538 | |
1539 | public: |
1540 | /// Defines the kind of the implicit parameter: is this an implicit parameter |
1541 | /// with pointer to 'this', 'self', '_cmd', virtual table pointers, captured |
1542 | /// context or something else. |
1543 | enum ImplicitParamKind : unsigned { |
1544 | /// Parameter for Objective-C 'self' argument |
1545 | ObjCSelf, |
1546 | |
1547 | /// Parameter for Objective-C '_cmd' argument |
1548 | ObjCCmd, |
1549 | |
1550 | /// Parameter for C++ 'this' argument |
1551 | CXXThis, |
1552 | |
1553 | /// Parameter for C++ virtual table pointers |
1554 | CXXVTT, |
1555 | |
1556 | /// Parameter for captured context |
1557 | CapturedContext, |
1558 | |
1559 | /// Other implicit parameter |
1560 | Other, |
1561 | }; |
1562 | |
1563 | /// Create implicit parameter. |
1564 | static ImplicitParamDecl *Create(ASTContext &C, DeclContext *DC, |
1565 | SourceLocation IdLoc, IdentifierInfo *Id, |
1566 | QualType T, ImplicitParamKind ParamKind); |
1567 | static ImplicitParamDecl *Create(ASTContext &C, QualType T, |
1568 | ImplicitParamKind ParamKind); |
1569 | |
1570 | static ImplicitParamDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1571 | |
1572 | ImplicitParamDecl(ASTContext &C, DeclContext *DC, SourceLocation IdLoc, |
1573 | IdentifierInfo *Id, QualType Type, |
1574 | ImplicitParamKind ParamKind) |
1575 | : VarDecl(ImplicitParam, C, DC, IdLoc, IdLoc, Id, Type, |
1576 | /*TInfo=*/nullptr, SC_None) { |
1577 | NonParmVarDeclBits.ImplicitParamKind = ParamKind; |
1578 | setImplicit(); |
1579 | } |
1580 | |
1581 | ImplicitParamDecl(ASTContext &C, QualType Type, ImplicitParamKind ParamKind) |
1582 | : VarDecl(ImplicitParam, C, /*DC=*/nullptr, SourceLocation(), |
1583 | SourceLocation(), /*Id=*/nullptr, Type, |
1584 | /*TInfo=*/nullptr, SC_None) { |
1585 | NonParmVarDeclBits.ImplicitParamKind = ParamKind; |
1586 | setImplicit(); |
1587 | } |
1588 | |
1589 | /// Returns the implicit parameter kind. |
1590 | ImplicitParamKind getParameterKind() const { |
1591 | return static_cast<ImplicitParamKind>(NonParmVarDeclBits.ImplicitParamKind); |
1592 | } |
1593 | |
1594 | // Implement isa/cast/dyncast/etc. |
1595 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
1596 | static bool classofKind(Kind K) { return K == ImplicitParam; } |
1597 | }; |
1598 | |
1599 | /// Represents a parameter to a function. |
1600 | class ParmVarDecl : public VarDecl { |
1601 | public: |
1602 | enum { MaxFunctionScopeDepth = 255 }; |
1603 | enum { MaxFunctionScopeIndex = 255 }; |
1604 | |
1605 | protected: |
1606 | ParmVarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1607 | SourceLocation IdLoc, IdentifierInfo *Id, QualType T, |
1608 | TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg) |
1609 | : VarDecl(DK, C, DC, StartLoc, IdLoc, Id, T, TInfo, S) { |
1610 | assert(ParmVarDeclBits.HasInheritedDefaultArg == false)((ParmVarDeclBits.HasInheritedDefaultArg == false) ? static_cast <void> (0) : __assert_fail ("ParmVarDeclBits.HasInheritedDefaultArg == false" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1610, __PRETTY_FUNCTION__)); |
1611 | assert(ParmVarDeclBits.DefaultArgKind == DAK_None)((ParmVarDeclBits.DefaultArgKind == DAK_None) ? static_cast< void> (0) : __assert_fail ("ParmVarDeclBits.DefaultArgKind == DAK_None" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1611, __PRETTY_FUNCTION__)); |
1612 | assert(ParmVarDeclBits.IsKNRPromoted == false)((ParmVarDeclBits.IsKNRPromoted == false) ? static_cast<void > (0) : __assert_fail ("ParmVarDeclBits.IsKNRPromoted == false" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1612, __PRETTY_FUNCTION__)); |
1613 | assert(ParmVarDeclBits.IsObjCMethodParam == false)((ParmVarDeclBits.IsObjCMethodParam == false) ? static_cast< void> (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam == false" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1613, __PRETTY_FUNCTION__)); |
1614 | setDefaultArg(DefArg); |
1615 | } |
1616 | |
1617 | public: |
1618 | static ParmVarDecl *Create(ASTContext &C, DeclContext *DC, |
1619 | SourceLocation StartLoc, |
1620 | SourceLocation IdLoc, IdentifierInfo *Id, |
1621 | QualType T, TypeSourceInfo *TInfo, |
1622 | StorageClass S, Expr *DefArg); |
1623 | |
1624 | static ParmVarDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1625 | |
1626 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
1627 | |
1628 | void setObjCMethodScopeInfo(unsigned parameterIndex) { |
1629 | ParmVarDeclBits.IsObjCMethodParam = true; |
1630 | setParameterIndex(parameterIndex); |
1631 | } |
1632 | |
1633 | void setScopeInfo(unsigned scopeDepth, unsigned parameterIndex) { |
1634 | assert(!ParmVarDeclBits.IsObjCMethodParam)((!ParmVarDeclBits.IsObjCMethodParam) ? static_cast<void> (0) : __assert_fail ("!ParmVarDeclBits.IsObjCMethodParam", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1634, __PRETTY_FUNCTION__)); |
1635 | |
1636 | ParmVarDeclBits.ScopeDepthOrObjCQuals = scopeDepth; |
1637 | assert(ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth((ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && "truncation!") ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1638, __PRETTY_FUNCTION__)) |
1638 | && "truncation!")((ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && "truncation!") ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1638, __PRETTY_FUNCTION__)); |
1639 | |
1640 | setParameterIndex(parameterIndex); |
1641 | } |
1642 | |
1643 | bool isObjCMethodParameter() const { |
1644 | return ParmVarDeclBits.IsObjCMethodParam; |
1645 | } |
1646 | |
1647 | unsigned getFunctionScopeDepth() const { |
1648 | if (ParmVarDeclBits.IsObjCMethodParam) return 0; |
1649 | return ParmVarDeclBits.ScopeDepthOrObjCQuals; |
1650 | } |
1651 | |
1652 | /// Returns the index of this parameter in its prototype or method scope. |
1653 | unsigned getFunctionScopeIndex() const { |
1654 | return getParameterIndex(); |
1655 | } |
1656 | |
1657 | ObjCDeclQualifier getObjCDeclQualifier() const { |
1658 | if (!ParmVarDeclBits.IsObjCMethodParam) return OBJC_TQ_None; |
1659 | return ObjCDeclQualifier(ParmVarDeclBits.ScopeDepthOrObjCQuals); |
1660 | } |
1661 | void setObjCDeclQualifier(ObjCDeclQualifier QTVal) { |
1662 | assert(ParmVarDeclBits.IsObjCMethodParam)((ParmVarDeclBits.IsObjCMethodParam) ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1662, __PRETTY_FUNCTION__)); |
1663 | ParmVarDeclBits.ScopeDepthOrObjCQuals = QTVal; |
1664 | } |
1665 | |
1666 | /// True if the value passed to this parameter must undergo |
1667 | /// K&R-style default argument promotion: |
1668 | /// |
1669 | /// C99 6.5.2.2. |
1670 | /// If the expression that denotes the called function has a type |
1671 | /// that does not include a prototype, the integer promotions are |
1672 | /// performed on each argument, and arguments that have type float |
1673 | /// are promoted to double. |
1674 | bool isKNRPromoted() const { |
1675 | return ParmVarDeclBits.IsKNRPromoted; |
1676 | } |
1677 | void setKNRPromoted(bool promoted) { |
1678 | ParmVarDeclBits.IsKNRPromoted = promoted; |
1679 | } |
1680 | |
1681 | Expr *getDefaultArg(); |
1682 | const Expr *getDefaultArg() const { |
1683 | return const_cast<ParmVarDecl *>(this)->getDefaultArg(); |
1684 | } |
1685 | |
1686 | void setDefaultArg(Expr *defarg); |
1687 | |
1688 | /// Retrieve the source range that covers the entire default |
1689 | /// argument. |
1690 | SourceRange getDefaultArgRange() const; |
1691 | void setUninstantiatedDefaultArg(Expr *arg); |
1692 | Expr *getUninstantiatedDefaultArg(); |
1693 | const Expr *getUninstantiatedDefaultArg() const { |
1694 | return const_cast<ParmVarDecl *>(this)->getUninstantiatedDefaultArg(); |
1695 | } |
1696 | |
1697 | /// Determines whether this parameter has a default argument, |
1698 | /// either parsed or not. |
1699 | bool hasDefaultArg() const; |
1700 | |
1701 | /// Determines whether this parameter has a default argument that has not |
1702 | /// yet been parsed. This will occur during the processing of a C++ class |
1703 | /// whose member functions have default arguments, e.g., |
1704 | /// @code |
1705 | /// class X { |
1706 | /// public: |
1707 | /// void f(int x = 17); // x has an unparsed default argument now |
1708 | /// }; // x has a regular default argument now |
1709 | /// @endcode |
1710 | bool hasUnparsedDefaultArg() const { |
1711 | return ParmVarDeclBits.DefaultArgKind == DAK_Unparsed; |
1712 | } |
1713 | |
1714 | bool hasUninstantiatedDefaultArg() const { |
1715 | return ParmVarDeclBits.DefaultArgKind == DAK_Uninstantiated; |
1716 | } |
1717 | |
1718 | /// Specify that this parameter has an unparsed default argument. |
1719 | /// The argument will be replaced with a real default argument via |
1720 | /// setDefaultArg when the class definition enclosing the function |
1721 | /// declaration that owns this default argument is completed. |
1722 | void setUnparsedDefaultArg() { |
1723 | ParmVarDeclBits.DefaultArgKind = DAK_Unparsed; |
1724 | } |
1725 | |
1726 | bool hasInheritedDefaultArg() const { |
1727 | return ParmVarDeclBits.HasInheritedDefaultArg; |
1728 | } |
1729 | |
1730 | void setHasInheritedDefaultArg(bool I = true) { |
1731 | ParmVarDeclBits.HasInheritedDefaultArg = I; |
1732 | } |
1733 | |
1734 | QualType getOriginalType() const; |
1735 | |
1736 | /// Sets the function declaration that owns this |
1737 | /// ParmVarDecl. Since ParmVarDecls are often created before the |
1738 | /// FunctionDecls that own them, this routine is required to update |
1739 | /// the DeclContext appropriately. |
1740 | void setOwningFunction(DeclContext *FD) { setDeclContext(FD); } |
1741 | |
1742 | // Implement isa/cast/dyncast/etc. |
1743 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
1744 | static bool classofKind(Kind K) { return K == ParmVar; } |
1745 | |
1746 | private: |
1747 | enum { ParameterIndexSentinel = (1 << NumParameterIndexBits) - 1 }; |
1748 | |
1749 | void setParameterIndex(unsigned parameterIndex) { |
1750 | if (parameterIndex >= ParameterIndexSentinel) { |
1751 | setParameterIndexLarge(parameterIndex); |
1752 | return; |
1753 | } |
1754 | |
1755 | ParmVarDeclBits.ParameterIndex = parameterIndex; |
1756 | assert(ParmVarDeclBits.ParameterIndex == parameterIndex && "truncation!")((ParmVarDeclBits.ParameterIndex == parameterIndex && "truncation!") ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.ParameterIndex == parameterIndex && \"truncation!\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 1756, __PRETTY_FUNCTION__)); |
1757 | } |
1758 | unsigned getParameterIndex() const { |
1759 | unsigned d = ParmVarDeclBits.ParameterIndex; |
1760 | return d == ParameterIndexSentinel ? getParameterIndexLarge() : d; |
1761 | } |
1762 | |
1763 | void setParameterIndexLarge(unsigned parameterIndex); |
1764 | unsigned getParameterIndexLarge() const; |
1765 | }; |
1766 | |
1767 | enum class MultiVersionKind { |
1768 | None, |
1769 | Target, |
1770 | CPUSpecific, |
1771 | CPUDispatch |
1772 | }; |
1773 | |
1774 | /// Represents a function declaration or definition. |
1775 | /// |
1776 | /// Since a given function can be declared several times in a program, |
1777 | /// there may be several FunctionDecls that correspond to that |
1778 | /// function. Only one of those FunctionDecls will be found when |
1779 | /// traversing the list of declarations in the context of the |
1780 | /// FunctionDecl (e.g., the translation unit); this FunctionDecl |
1781 | /// contains all of the information known about the function. Other, |
1782 | /// previous declarations of the function are available via the |
1783 | /// getPreviousDecl() chain. |
1784 | class FunctionDecl : public DeclaratorDecl, |
1785 | public DeclContext, |
1786 | public Redeclarable<FunctionDecl> { |
1787 | // This class stores some data in DeclContext::FunctionDeclBits |
1788 | // to save some space. Use the provided accessors to access it. |
1789 | public: |
1790 | /// The kind of templated function a FunctionDecl can be. |
1791 | enum TemplatedKind { |
1792 | // Not templated. |
1793 | TK_NonTemplate, |
1794 | // The pattern in a function template declaration. |
1795 | TK_FunctionTemplate, |
1796 | // A non-template function that is an instantiation or explicit |
1797 | // specialization of a member of a templated class. |
1798 | TK_MemberSpecialization, |
1799 | // An instantiation or explicit specialization of a function template. |
1800 | // Note: this might have been instantiated from a templated class if it |
1801 | // is a class-scope explicit specialization. |
1802 | TK_FunctionTemplateSpecialization, |
1803 | // A function template specialization that hasn't yet been resolved to a |
1804 | // particular specialized function template. |
1805 | TK_DependentFunctionTemplateSpecialization |
1806 | }; |
1807 | |
1808 | private: |
1809 | /// A new[]'d array of pointers to VarDecls for the formal |
1810 | /// parameters of this function. This is null if a prototype or if there are |
1811 | /// no formals. |
1812 | ParmVarDecl **ParamInfo = nullptr; |
1813 | |
1814 | LazyDeclStmtPtr Body; |
1815 | |
1816 | unsigned ODRHash; |
1817 | |
1818 | /// End part of this FunctionDecl's source range. |
1819 | /// |
1820 | /// We could compute the full range in getSourceRange(). However, when we're |
1821 | /// dealing with a function definition deserialized from a PCH/AST file, |
1822 | /// we can only compute the full range once the function body has been |
1823 | /// de-serialized, so it's far better to have the (sometimes-redundant) |
1824 | /// EndRangeLoc. |
1825 | SourceLocation EndRangeLoc; |
1826 | |
1827 | /// The template or declaration that this declaration |
1828 | /// describes or was instantiated from, respectively. |
1829 | /// |
1830 | /// For non-templates, this value will be NULL. For function |
1831 | /// declarations that describe a function template, this will be a |
1832 | /// pointer to a FunctionTemplateDecl. For member functions |
1833 | /// of class template specializations, this will be a MemberSpecializationInfo |
1834 | /// pointer containing information about the specialization. |
1835 | /// For function template specializations, this will be a |
1836 | /// FunctionTemplateSpecializationInfo, which contains information about |
1837 | /// the template being specialized and the template arguments involved in |
1838 | /// that specialization. |
1839 | llvm::PointerUnion4<FunctionTemplateDecl *, |
1840 | MemberSpecializationInfo *, |
1841 | FunctionTemplateSpecializationInfo *, |
1842 | DependentFunctionTemplateSpecializationInfo *> |
1843 | TemplateOrSpecialization; |
1844 | |
1845 | /// Provides source/type location info for the declaration name embedded in |
1846 | /// the DeclaratorDecl base class. |
1847 | DeclarationNameLoc DNLoc; |
1848 | |
1849 | /// Specify that this function declaration is actually a function |
1850 | /// template specialization. |
1851 | /// |
1852 | /// \param C the ASTContext. |
1853 | /// |
1854 | /// \param Template the function template that this function template |
1855 | /// specialization specializes. |
1856 | /// |
1857 | /// \param TemplateArgs the template arguments that produced this |
1858 | /// function template specialization from the template. |
1859 | /// |
1860 | /// \param InsertPos If non-NULL, the position in the function template |
1861 | /// specialization set where the function template specialization data will |
1862 | /// be inserted. |
1863 | /// |
1864 | /// \param TSK the kind of template specialization this is. |
1865 | /// |
1866 | /// \param TemplateArgsAsWritten location info of template arguments. |
1867 | /// |
1868 | /// \param PointOfInstantiation point at which the function template |
1869 | /// specialization was first instantiated. |
1870 | void setFunctionTemplateSpecialization(ASTContext &C, |
1871 | FunctionTemplateDecl *Template, |
1872 | const TemplateArgumentList *TemplateArgs, |
1873 | void *InsertPos, |
1874 | TemplateSpecializationKind TSK, |
1875 | const TemplateArgumentListInfo *TemplateArgsAsWritten, |
1876 | SourceLocation PointOfInstantiation); |
1877 | |
1878 | /// Specify that this record is an instantiation of the |
1879 | /// member function FD. |
1880 | void setInstantiationOfMemberFunction(ASTContext &C, FunctionDecl *FD, |
1881 | TemplateSpecializationKind TSK); |
1882 | |
1883 | void setParams(ASTContext &C, ArrayRef<ParmVarDecl *> NewParamInfo); |
1884 | |
1885 | // This is unfortunately needed because ASTDeclWriter::VisitFunctionDecl |
1886 | // need to access this bit but we want to avoid making ASTDeclWriter |
1887 | // a friend of FunctionDeclBitfields just for this. |
1888 | bool isDeletedBit() const { return FunctionDeclBits.IsDeleted; } |
1889 | |
1890 | /// Whether an ODRHash has been stored. |
1891 | bool hasODRHash() const { return FunctionDeclBits.HasODRHash; } |
1892 | |
1893 | /// State that an ODRHash has been stored. |
1894 | void setHasODRHash(bool B = true) { FunctionDeclBits.HasODRHash = B; } |
1895 | |
1896 | protected: |
1897 | FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1898 | const DeclarationNameInfo &NameInfo, QualType T, |
1899 | TypeSourceInfo *TInfo, StorageClass S, bool isInlineSpecified, |
1900 | ConstexprSpecKind ConstexprKind); |
1901 | |
1902 | using redeclarable_base = Redeclarable<FunctionDecl>; |
1903 | |
1904 | FunctionDecl *getNextRedeclarationImpl() override { |
1905 | return getNextRedeclaration(); |
1906 | } |
1907 | |
1908 | FunctionDecl *getPreviousDeclImpl() override { |
1909 | return getPreviousDecl(); |
1910 | } |
1911 | |
1912 | FunctionDecl *getMostRecentDeclImpl() override { |
1913 | return getMostRecentDecl(); |
1914 | } |
1915 | |
1916 | public: |
1917 | friend class ASTDeclReader; |
1918 | friend class ASTDeclWriter; |
1919 | |
1920 | using redecl_range = redeclarable_base::redecl_range; |
1921 | using redecl_iterator = redeclarable_base::redecl_iterator; |
1922 | |
1923 | using redeclarable_base::redecls_begin; |
1924 | using redeclarable_base::redecls_end; |
1925 | using redeclarable_base::redecls; |
1926 | using redeclarable_base::getPreviousDecl; |
1927 | using redeclarable_base::getMostRecentDecl; |
1928 | using redeclarable_base::isFirstDecl; |
1929 | |
1930 | static FunctionDecl * |
1931 | Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1932 | SourceLocation NLoc, DeclarationName N, QualType T, |
1933 | TypeSourceInfo *TInfo, StorageClass SC, bool isInlineSpecified = false, |
1934 | bool hasWrittenPrototype = true, |
1935 | ConstexprSpecKind ConstexprKind = CSK_unspecified) { |
1936 | DeclarationNameInfo NameInfo(N, NLoc); |
1937 | return FunctionDecl::Create(C, DC, StartLoc, NameInfo, T, TInfo, SC, |
1938 | isInlineSpecified, hasWrittenPrototype, |
1939 | ConstexprKind); |
1940 | } |
1941 | |
1942 | static FunctionDecl *Create(ASTContext &C, DeclContext *DC, |
1943 | SourceLocation StartLoc, |
1944 | const DeclarationNameInfo &NameInfo, QualType T, |
1945 | TypeSourceInfo *TInfo, StorageClass SC, |
1946 | bool isInlineSpecified, bool hasWrittenPrototype, |
1947 | ConstexprSpecKind ConstexprKind); |
1948 | |
1949 | static FunctionDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1950 | |
1951 | DeclarationNameInfo getNameInfo() const { |
1952 | return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); |
1953 | } |
1954 | |
1955 | void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy, |
1956 | bool Qualified) const override; |
1957 | |
1958 | void setRangeEnd(SourceLocation E) { EndRangeLoc = E; } |
1959 | |
1960 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
1961 | |
1962 | // Function definitions. |
1963 | // |
1964 | // A function declaration may be: |
1965 | // - a non defining declaration, |
1966 | // - a definition. A function may be defined because: |
1967 | // - it has a body, or will have it in the case of late parsing. |
1968 | // - it has an uninstantiated body. The body does not exist because the |
1969 | // function is not used yet, but the declaration is considered a |
1970 | // definition and does not allow other definition of this function. |
1971 | // - it does not have a user specified body, but it does not allow |
1972 | // redefinition, because it is deleted/defaulted or is defined through |
1973 | // some other mechanism (alias, ifunc). |
1974 | |
1975 | /// Returns true if the function has a body. |
1976 | /// |
1977 | /// The function body might be in any of the (re-)declarations of this |
1978 | /// function. The variant that accepts a FunctionDecl pointer will set that |
1979 | /// function declaration to the actual declaration containing the body (if |
1980 | /// there is one). |
1981 | bool hasBody(const FunctionDecl *&Definition) const; |
1982 | |
1983 | bool hasBody() const override { |
1984 | const FunctionDecl* Definition; |
1985 | return hasBody(Definition); |
1986 | } |
1987 | |
1988 | /// Returns whether the function has a trivial body that does not require any |
1989 | /// specific codegen. |
1990 | bool hasTrivialBody() const; |
1991 | |
1992 | /// Returns true if the function has a definition that does not need to be |
1993 | /// instantiated. |
1994 | /// |
1995 | /// The variant that accepts a FunctionDecl pointer will set that function |
1996 | /// declaration to the declaration that is a definition (if there is one). |
1997 | bool isDefined(const FunctionDecl *&Definition) const; |
1998 | |
1999 | virtual bool isDefined() const { |
2000 | const FunctionDecl* Definition; |
2001 | return isDefined(Definition); |
2002 | } |
2003 | |
2004 | /// Get the definition for this declaration. |
2005 | FunctionDecl *getDefinition() { |
2006 | const FunctionDecl *Definition; |
2007 | if (isDefined(Definition)) |
2008 | return const_cast<FunctionDecl *>(Definition); |
2009 | return nullptr; |
2010 | } |
2011 | const FunctionDecl *getDefinition() const { |
2012 | return const_cast<FunctionDecl *>(this)->getDefinition(); |
2013 | } |
2014 | |
2015 | /// Retrieve the body (definition) of the function. The function body might be |
2016 | /// in any of the (re-)declarations of this function. The variant that accepts |
2017 | /// a FunctionDecl pointer will set that function declaration to the actual |
2018 | /// declaration containing the body (if there is one). |
2019 | /// NOTE: For checking if there is a body, use hasBody() instead, to avoid |
2020 | /// unnecessary AST de-serialization of the body. |
2021 | Stmt *getBody(const FunctionDecl *&Definition) const; |
2022 | |
2023 | Stmt *getBody() const override { |
2024 | const FunctionDecl* Definition; |
2025 | return getBody(Definition); |
2026 | } |
2027 | |
2028 | /// Returns whether this specific declaration of the function is also a |
2029 | /// definition that does not contain uninstantiated body. |
2030 | /// |
2031 | /// This does not determine whether the function has been defined (e.g., in a |
2032 | /// previous definition); for that information, use isDefined. |
2033 | bool isThisDeclarationADefinition() const { |
2034 | return isDeletedAsWritten() || isDefaulted() || Body || hasSkippedBody() || |
2035 | isLateTemplateParsed() || willHaveBody() || hasDefiningAttr(); |
2036 | } |
2037 | |
2038 | /// Returns whether this specific declaration of the function has a body. |
2039 | bool doesThisDeclarationHaveABody() const { |
2040 | return Body || isLateTemplateParsed(); |
2041 | } |
2042 | |
2043 | void setBody(Stmt *B); |
2044 | void setLazyBody(uint64_t Offset) { Body = Offset; } |
2045 | |
2046 | /// Whether this function is variadic. |
2047 | bool isVariadic() const; |
2048 | |
2049 | /// Whether this function is marked as virtual explicitly. |
2050 | bool isVirtualAsWritten() const { |
2051 | return FunctionDeclBits.IsVirtualAsWritten; |
2052 | } |
2053 | |
2054 | /// State that this function is marked as virtual explicitly. |
2055 | void setVirtualAsWritten(bool V) { FunctionDeclBits.IsVirtualAsWritten = V; } |
2056 | |
2057 | /// Whether this virtual function is pure, i.e. makes the containing class |
2058 | /// abstract. |
2059 | bool isPure() const { return FunctionDeclBits.IsPure; } |
2060 | void setPure(bool P = true); |
2061 | |
2062 | /// Whether this templated function will be late parsed. |
2063 | bool isLateTemplateParsed() const { |
2064 | return FunctionDeclBits.IsLateTemplateParsed; |
2065 | } |
2066 | |
2067 | /// State that this templated function will be late parsed. |
2068 | void setLateTemplateParsed(bool ILT = true) { |
2069 | FunctionDeclBits.IsLateTemplateParsed = ILT; |
2070 | } |
2071 | |
2072 | /// Whether this function is "trivial" in some specialized C++ senses. |
2073 | /// Can only be true for default constructors, copy constructors, |
2074 | /// copy assignment operators, and destructors. Not meaningful until |
2075 | /// the class has been fully built by Sema. |
2076 | bool isTrivial() const { return FunctionDeclBits.IsTrivial; } |
2077 | void setTrivial(bool IT) { FunctionDeclBits.IsTrivial = IT; } |
2078 | |
2079 | bool isTrivialForCall() const { return FunctionDeclBits.IsTrivialForCall; } |
2080 | void setTrivialForCall(bool IT) { FunctionDeclBits.IsTrivialForCall = IT; } |
2081 | |
2082 | /// Whether this function is defaulted per C++0x. Only valid for |
2083 | /// special member functions. |
2084 | bool isDefaulted() const { return FunctionDeclBits.IsDefaulted; } |
2085 | void setDefaulted(bool D = true) { FunctionDeclBits.IsDefaulted = D; } |
2086 | |
2087 | /// Whether this function is explicitly defaulted per C++0x. Only valid |
2088 | /// for special member functions. |
2089 | bool isExplicitlyDefaulted() const { |
2090 | return FunctionDeclBits.IsExplicitlyDefaulted; |
2091 | } |
2092 | |
2093 | /// State that this function is explicitly defaulted per C++0x. Only valid |
2094 | /// for special member functions. |
2095 | void setExplicitlyDefaulted(bool ED = true) { |
2096 | FunctionDeclBits.IsExplicitlyDefaulted = ED; |
2097 | } |
2098 | |
2099 | /// Whether falling off this function implicitly returns null/zero. |
2100 | /// If a more specific implicit return value is required, front-ends |
2101 | /// should synthesize the appropriate return statements. |
2102 | bool hasImplicitReturnZero() const { |
2103 | return FunctionDeclBits.HasImplicitReturnZero; |
2104 | } |
2105 | |
2106 | /// State that falling off this function implicitly returns null/zero. |
2107 | /// If a more specific implicit return value is required, front-ends |
2108 | /// should synthesize the appropriate return statements. |
2109 | void setHasImplicitReturnZero(bool IRZ) { |
2110 | FunctionDeclBits.HasImplicitReturnZero = IRZ; |
2111 | } |
2112 | |
2113 | /// Whether this function has a prototype, either because one |
2114 | /// was explicitly written or because it was "inherited" by merging |
2115 | /// a declaration without a prototype with a declaration that has a |
2116 | /// prototype. |
2117 | bool hasPrototype() const { |
2118 | return hasWrittenPrototype() || hasInheritedPrototype(); |
2119 | } |
2120 | |
2121 | /// Whether this function has a written prototype. |
2122 | bool hasWrittenPrototype() const { |
2123 | return FunctionDeclBits.HasWrittenPrototype; |
2124 | } |
2125 | |
2126 | /// State that this function has a written prototype. |
2127 | void setHasWrittenPrototype(bool P = true) { |
2128 | FunctionDeclBits.HasWrittenPrototype = P; |
2129 | } |
2130 | |
2131 | /// Whether this function inherited its prototype from a |
2132 | /// previous declaration. |
2133 | bool hasInheritedPrototype() const { |
2134 | return FunctionDeclBits.HasInheritedPrototype; |
2135 | } |
2136 | |
2137 | /// State that this function inherited its prototype from a |
2138 | /// previous declaration. |
2139 | void setHasInheritedPrototype(bool P = true) { |
2140 | FunctionDeclBits.HasInheritedPrototype = P; |
2141 | } |
2142 | |
2143 | /// Whether this is a (C++11) constexpr function or constexpr constructor. |
2144 | bool isConstexpr() const { |
2145 | return FunctionDeclBits.ConstexprKind != CSK_unspecified; |
2146 | } |
2147 | void setConstexprKind(ConstexprSpecKind CSK) { |
2148 | FunctionDeclBits.ConstexprKind = CSK; |
2149 | } |
2150 | ConstexprSpecKind getConstexprKind() const { |
2151 | return static_cast<ConstexprSpecKind>(FunctionDeclBits.ConstexprKind); |
2152 | } |
2153 | bool isConstexprSpecified() const { |
2154 | return FunctionDeclBits.ConstexprKind == CSK_constexpr; |
2155 | } |
2156 | bool isConsteval() const { |
2157 | return FunctionDeclBits.ConstexprKind == CSK_consteval; |
2158 | } |
2159 | |
2160 | /// Whether the instantiation of this function is pending. |
2161 | /// This bit is set when the decision to instantiate this function is made |
2162 | /// and unset if and when the function body is created. That leaves out |
2163 | /// cases where instantiation did not happen because the template definition |
2164 | /// was not seen in this TU. This bit remains set in those cases, under the |
2165 | /// assumption that the instantiation will happen in some other TU. |
2166 | bool instantiationIsPending() const { |
2167 | return FunctionDeclBits.InstantiationIsPending; |
2168 | } |
2169 | |
2170 | /// State that the instantiation of this function is pending. |
2171 | /// (see instantiationIsPending) |
2172 | void setInstantiationIsPending(bool IC) { |
2173 | FunctionDeclBits.InstantiationIsPending = IC; |
2174 | } |
2175 | |
2176 | /// Indicates the function uses __try. |
2177 | bool usesSEHTry() const { return FunctionDeclBits.UsesSEHTry; } |
2178 | void setUsesSEHTry(bool UST) { FunctionDeclBits.UsesSEHTry = UST; } |
2179 | |
2180 | /// Whether this function has been deleted. |
2181 | /// |
2182 | /// A function that is "deleted" (via the C++0x "= delete" syntax) |
2183 | /// acts like a normal function, except that it cannot actually be |
2184 | /// called or have its address taken. Deleted functions are |
2185 | /// typically used in C++ overload resolution to attract arguments |
2186 | /// whose type or lvalue/rvalue-ness would permit the use of a |
2187 | /// different overload that would behave incorrectly. For example, |
2188 | /// one might use deleted functions to ban implicit conversion from |
2189 | /// a floating-point number to an Integer type: |
2190 | /// |
2191 | /// @code |
2192 | /// struct Integer { |
2193 | /// Integer(long); // construct from a long |
2194 | /// Integer(double) = delete; // no construction from float or double |
2195 | /// Integer(long double) = delete; // no construction from long double |
2196 | /// }; |
2197 | /// @endcode |
2198 | // If a function is deleted, its first declaration must be. |
2199 | bool isDeleted() const { |
2200 | return getCanonicalDecl()->FunctionDeclBits.IsDeleted; |
2201 | } |
2202 | |
2203 | bool isDeletedAsWritten() const { |
2204 | return FunctionDeclBits.IsDeleted && !isDefaulted(); |
2205 | } |
2206 | |
2207 | void setDeletedAsWritten(bool D = true) { FunctionDeclBits.IsDeleted = D; } |
2208 | |
2209 | /// Determines whether this function is "main", which is the |
2210 | /// entry point into an executable program. |
2211 | bool isMain() const; |
2212 | |
2213 | /// Determines whether this function is a MSVCRT user defined entry |
2214 | /// point. |
2215 | bool isMSVCRTEntryPoint() const; |
2216 | |
2217 | /// Determines whether this operator new or delete is one |
2218 | /// of the reserved global placement operators: |
2219 | /// void *operator new(size_t, void *); |
2220 | /// void *operator new[](size_t, void *); |
2221 | /// void operator delete(void *, void *); |
2222 | /// void operator delete[](void *, void *); |
2223 | /// These functions have special behavior under [new.delete.placement]: |
2224 | /// These functions are reserved, a C++ program may not define |
2225 | /// functions that displace the versions in the Standard C++ library. |
2226 | /// The provisions of [basic.stc.dynamic] do not apply to these |
2227 | /// reserved placement forms of operator new and operator delete. |
2228 | /// |
2229 | /// This function must be an allocation or deallocation function. |
2230 | bool isReservedGlobalPlacementOperator() const; |
2231 | |
2232 | /// Determines whether this function is one of the replaceable |
2233 | /// global allocation functions: |
2234 | /// void *operator new(size_t); |
2235 | /// void *operator new(size_t, const std::nothrow_t &) noexcept; |
2236 | /// void *operator new[](size_t); |
2237 | /// void *operator new[](size_t, const std::nothrow_t &) noexcept; |
2238 | /// void operator delete(void *) noexcept; |
2239 | /// void operator delete(void *, std::size_t) noexcept; [C++1y] |
2240 | /// void operator delete(void *, const std::nothrow_t &) noexcept; |
2241 | /// void operator delete[](void *) noexcept; |
2242 | /// void operator delete[](void *, std::size_t) noexcept; [C++1y] |
2243 | /// void operator delete[](void *, const std::nothrow_t &) noexcept; |
2244 | /// These functions have special behavior under C++1y [expr.new]: |
2245 | /// An implementation is allowed to omit a call to a replaceable global |
2246 | /// allocation function. [...] |
2247 | /// |
2248 | /// If this function is an aligned allocation/deallocation function, return |
2249 | /// true through IsAligned. |
2250 | bool isReplaceableGlobalAllocationFunction(bool *IsAligned = nullptr) const; |
2251 | |
2252 | /// Determine whether this is a destroying operator delete. |
2253 | bool isDestroyingOperatorDelete() const; |
2254 | |
2255 | /// Compute the language linkage. |
2256 | LanguageLinkage getLanguageLinkage() const; |
2257 | |
2258 | /// Determines whether this function is a function with |
2259 | /// external, C linkage. |
2260 | bool isExternC() const; |
2261 | |
2262 | /// Determines whether this function's context is, or is nested within, |
2263 | /// a C++ extern "C" linkage spec. |
2264 | bool isInExternCContext() const; |
2265 | |
2266 | /// Determines whether this function's context is, or is nested within, |
2267 | /// a C++ extern "C++" linkage spec. |
2268 | bool isInExternCXXContext() const; |
2269 | |
2270 | /// Determines whether this is a global function. |
2271 | bool isGlobal() const; |
2272 | |
2273 | /// Determines whether this function is known to be 'noreturn', through |
2274 | /// an attribute on its declaration or its type. |
2275 | bool isNoReturn() const; |
2276 | |
2277 | /// True if the function was a definition but its body was skipped. |
2278 | bool hasSkippedBody() const { return FunctionDeclBits.HasSkippedBody; } |
2279 | void setHasSkippedBody(bool Skipped = true) { |
2280 | FunctionDeclBits.HasSkippedBody = Skipped; |
2281 | } |
2282 | |
2283 | /// True if this function will eventually have a body, once it's fully parsed. |
2284 | bool willHaveBody() const { return FunctionDeclBits.WillHaveBody; } |
2285 | void setWillHaveBody(bool V = true) { FunctionDeclBits.WillHaveBody = V; } |
2286 | |
2287 | /// True if this function is considered a multiversioned function. |
2288 | bool isMultiVersion() const { |
2289 | return getCanonicalDecl()->FunctionDeclBits.IsMultiVersion; |
2290 | } |
2291 | |
2292 | /// Sets the multiversion state for this declaration and all of its |
2293 | /// redeclarations. |
2294 | void setIsMultiVersion(bool V = true) { |
2295 | getCanonicalDecl()->FunctionDeclBits.IsMultiVersion = V; |
2296 | } |
2297 | |
2298 | /// Gets the kind of multiversioning attribute this declaration has. Note that |
2299 | /// this can return a value even if the function is not multiversion, such as |
2300 | /// the case of 'target'. |
2301 | MultiVersionKind getMultiVersionKind() const; |
2302 | |
2303 | |
2304 | /// True if this function is a multiversioned dispatch function as a part of |
2305 | /// the cpu_specific/cpu_dispatch functionality. |
2306 | bool isCPUDispatchMultiVersion() const; |
2307 | /// True if this function is a multiversioned processor specific function as a |
2308 | /// part of the cpu_specific/cpu_dispatch functionality. |
2309 | bool isCPUSpecificMultiVersion() const; |
2310 | |
2311 | /// True if this function is a multiversioned dispatch function as a part of |
2312 | /// the target functionality. |
2313 | bool isTargetMultiVersion() const; |
2314 | |
2315 | void setPreviousDeclaration(FunctionDecl * PrevDecl); |
2316 | |
2317 | FunctionDecl *getCanonicalDecl() override; |
2318 | const FunctionDecl *getCanonicalDecl() const { |
2319 | return const_cast<FunctionDecl*>(this)->getCanonicalDecl(); |
2320 | } |
2321 | |
2322 | unsigned getBuiltinID(bool ConsiderWrapperFunctions = false) const; |
2323 | |
2324 | // ArrayRef interface to parameters. |
2325 | ArrayRef<ParmVarDecl *> parameters() const { |
2326 | return {ParamInfo, getNumParams()}; |
2327 | } |
2328 | MutableArrayRef<ParmVarDecl *> parameters() { |
2329 | return {ParamInfo, getNumParams()}; |
2330 | } |
2331 | |
2332 | // Iterator access to formal parameters. |
2333 | using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator; |
2334 | using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator; |
2335 | |
2336 | bool param_empty() const { return parameters().empty(); } |
2337 | param_iterator param_begin() { return parameters().begin(); } |
2338 | param_iterator param_end() { return parameters().end(); } |
2339 | param_const_iterator param_begin() const { return parameters().begin(); } |
2340 | param_const_iterator param_end() const { return parameters().end(); } |
2341 | size_t param_size() const { return parameters().size(); } |
2342 | |
2343 | /// Return the number of parameters this function must have based on its |
2344 | /// FunctionType. This is the length of the ParamInfo array after it has been |
2345 | /// created. |
2346 | unsigned getNumParams() const; |
2347 | |
2348 | const ParmVarDecl *getParamDecl(unsigned i) const { |
2349 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2349, __PRETTY_FUNCTION__)); |
2350 | return ParamInfo[i]; |
2351 | } |
2352 | ParmVarDecl *getParamDecl(unsigned i) { |
2353 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2353, __PRETTY_FUNCTION__)); |
2354 | return ParamInfo[i]; |
2355 | } |
2356 | void setParams(ArrayRef<ParmVarDecl *> NewParamInfo) { |
2357 | setParams(getASTContext(), NewParamInfo); |
2358 | } |
2359 | |
2360 | /// Returns the minimum number of arguments needed to call this function. This |
2361 | /// may be fewer than the number of function parameters, if some of the |
2362 | /// parameters have default arguments (in C++). |
2363 | unsigned getMinRequiredArguments() const; |
2364 | |
2365 | QualType getReturnType() const { |
2366 | return getType()->castAs<FunctionType>()->getReturnType(); |
2367 | } |
2368 | |
2369 | /// Attempt to compute an informative source range covering the |
2370 | /// function return type. This may omit qualifiers and other information with |
2371 | /// limited representation in the AST. |
2372 | SourceRange getReturnTypeSourceRange() const; |
2373 | |
2374 | /// Get the declared return type, which may differ from the actual return |
2375 | /// type if the return type is deduced. |
2376 | QualType getDeclaredReturnType() const { |
2377 | auto *TSI = getTypeSourceInfo(); |
2378 | QualType T = TSI ? TSI->getType() : getType(); |
2379 | return T->castAs<FunctionType>()->getReturnType(); |
2380 | } |
2381 | |
2382 | /// Gets the ExceptionSpecificationType as declared. |
2383 | ExceptionSpecificationType getExceptionSpecType() const { |
2384 | auto *TSI = getTypeSourceInfo(); |
2385 | QualType T = TSI ? TSI->getType() : getType(); |
2386 | const auto *FPT = T->getAs<FunctionProtoType>(); |
2387 | return FPT ? FPT->getExceptionSpecType() : EST_None; |
2388 | } |
2389 | |
2390 | /// Attempt to compute an informative source range covering the |
2391 | /// function exception specification, if any. |
2392 | SourceRange getExceptionSpecSourceRange() const; |
2393 | |
2394 | /// Determine the type of an expression that calls this function. |
2395 | QualType getCallResultType() const { |
2396 | return getType()->castAs<FunctionType>()->getCallResultType( |
2397 | getASTContext()); |
2398 | } |
2399 | |
2400 | /// Returns the storage class as written in the source. For the |
2401 | /// computed linkage of symbol, see getLinkage. |
2402 | StorageClass getStorageClass() const { |
2403 | return static_cast<StorageClass>(FunctionDeclBits.SClass); |
2404 | } |
2405 | |
2406 | /// Sets the storage class as written in the source. |
2407 | void setStorageClass(StorageClass SClass) { |
2408 | FunctionDeclBits.SClass = SClass; |
2409 | } |
2410 | |
2411 | /// Determine whether the "inline" keyword was specified for this |
2412 | /// function. |
2413 | bool isInlineSpecified() const { return FunctionDeclBits.IsInlineSpecified; } |
2414 | |
2415 | /// Set whether the "inline" keyword was specified for this function. |
2416 | void setInlineSpecified(bool I) { |
2417 | FunctionDeclBits.IsInlineSpecified = I; |
2418 | FunctionDeclBits.IsInline = I; |
2419 | } |
2420 | |
2421 | /// Flag that this function is implicitly inline. |
2422 | void setImplicitlyInline(bool I = true) { FunctionDeclBits.IsInline = I; } |
2423 | |
2424 | /// Determine whether this function should be inlined, because it is |
2425 | /// either marked "inline" or "constexpr" or is a member function of a class |
2426 | /// that was defined in the class body. |
2427 | bool isInlined() const { return FunctionDeclBits.IsInline; } |
2428 | |
2429 | bool isInlineDefinitionExternallyVisible() const; |
2430 | |
2431 | bool isMSExternInline() const; |
2432 | |
2433 | bool doesDeclarationForceExternallyVisibleDefinition() const; |
2434 | |
2435 | bool isStatic() const { return getStorageClass() == SC_Static; } |
2436 | |
2437 | /// Whether this function declaration represents an C++ overloaded |
2438 | /// operator, e.g., "operator+". |
2439 | bool isOverloadedOperator() const { |
2440 | return getOverloadedOperator() != OO_None; |
2441 | } |
2442 | |
2443 | OverloadedOperatorKind getOverloadedOperator() const; |
2444 | |
2445 | const IdentifierInfo *getLiteralIdentifier() const; |
2446 | |
2447 | /// If this function is an instantiation of a member function |
2448 | /// of a class template specialization, retrieves the function from |
2449 | /// which it was instantiated. |
2450 | /// |
2451 | /// This routine will return non-NULL for (non-templated) member |
2452 | /// functions of class templates and for instantiations of function |
2453 | /// templates. For example, given: |
2454 | /// |
2455 | /// \code |
2456 | /// template<typename T> |
2457 | /// struct X { |
2458 | /// void f(T); |
2459 | /// }; |
2460 | /// \endcode |
2461 | /// |
2462 | /// The declaration for X<int>::f is a (non-templated) FunctionDecl |
2463 | /// whose parent is the class template specialization X<int>. For |
2464 | /// this declaration, getInstantiatedFromFunction() will return |
2465 | /// the FunctionDecl X<T>::A. When a complete definition of |
2466 | /// X<int>::A is required, it will be instantiated from the |
2467 | /// declaration returned by getInstantiatedFromMemberFunction(). |
2468 | FunctionDecl *getInstantiatedFromMemberFunction() const; |
2469 | |
2470 | /// What kind of templated function this is. |
2471 | TemplatedKind getTemplatedKind() const; |
2472 | |
2473 | /// If this function is an instantiation of a member function of a |
2474 | /// class template specialization, retrieves the member specialization |
2475 | /// information. |
2476 | MemberSpecializationInfo *getMemberSpecializationInfo() const; |
2477 | |
2478 | /// Specify that this record is an instantiation of the |
2479 | /// member function FD. |
2480 | void setInstantiationOfMemberFunction(FunctionDecl *FD, |
2481 | TemplateSpecializationKind TSK) { |
2482 | setInstantiationOfMemberFunction(getASTContext(), FD, TSK); |
2483 | } |
2484 | |
2485 | /// Retrieves the function template that is described by this |
2486 | /// function declaration. |
2487 | /// |
2488 | /// Every function template is represented as a FunctionTemplateDecl |
2489 | /// and a FunctionDecl (or something derived from FunctionDecl). The |
2490 | /// former contains template properties (such as the template |
2491 | /// parameter lists) while the latter contains the actual |
2492 | /// description of the template's |
2493 | /// contents. FunctionTemplateDecl::getTemplatedDecl() retrieves the |
2494 | /// FunctionDecl that describes the function template, |
2495 | /// getDescribedFunctionTemplate() retrieves the |
2496 | /// FunctionTemplateDecl from a FunctionDecl. |
2497 | FunctionTemplateDecl *getDescribedFunctionTemplate() const; |
2498 | |
2499 | void setDescribedFunctionTemplate(FunctionTemplateDecl *Template); |
2500 | |
2501 | /// Determine whether this function is a function template |
2502 | /// specialization. |
2503 | bool isFunctionTemplateSpecialization() const { |
2504 | return getPrimaryTemplate() != nullptr; |
2505 | } |
2506 | |
2507 | /// If this function is actually a function template specialization, |
2508 | /// retrieve information about this function template specialization. |
2509 | /// Otherwise, returns NULL. |
2510 | FunctionTemplateSpecializationInfo *getTemplateSpecializationInfo() const; |
2511 | |
2512 | /// Determines whether this function is a function template |
2513 | /// specialization or a member of a class template specialization that can |
2514 | /// be implicitly instantiated. |
2515 | bool isImplicitlyInstantiable() const; |
2516 | |
2517 | /// Determines if the given function was instantiated from a |
2518 | /// function template. |
2519 | bool isTemplateInstantiation() const; |
2520 | |
2521 | /// Retrieve the function declaration from which this function could |
2522 | /// be instantiated, if it is an instantiation (rather than a non-template |
2523 | /// or a specialization, for example). |
2524 | FunctionDecl *getTemplateInstantiationPattern() const; |
2525 | |
2526 | /// Retrieve the primary template that this function template |
2527 | /// specialization either specializes or was instantiated from. |
2528 | /// |
2529 | /// If this function declaration is not a function template specialization, |
2530 | /// returns NULL. |
2531 | FunctionTemplateDecl *getPrimaryTemplate() const; |
2532 | |
2533 | /// Retrieve the template arguments used to produce this function |
2534 | /// template specialization from the primary template. |
2535 | /// |
2536 | /// If this function declaration is not a function template specialization, |
2537 | /// returns NULL. |
2538 | const TemplateArgumentList *getTemplateSpecializationArgs() const; |
2539 | |
2540 | /// Retrieve the template argument list as written in the sources, |
2541 | /// if any. |
2542 | /// |
2543 | /// If this function declaration is not a function template specialization |
2544 | /// or if it had no explicit template argument list, returns NULL. |
2545 | /// Note that it an explicit template argument list may be written empty, |
2546 | /// e.g., template<> void foo<>(char* s); |
2547 | const ASTTemplateArgumentListInfo* |
2548 | getTemplateSpecializationArgsAsWritten() const; |
2549 | |
2550 | /// Specify that this function declaration is actually a function |
2551 | /// template specialization. |
2552 | /// |
2553 | /// \param Template the function template that this function template |
2554 | /// specialization specializes. |
2555 | /// |
2556 | /// \param TemplateArgs the template arguments that produced this |
2557 | /// function template specialization from the template. |
2558 | /// |
2559 | /// \param InsertPos If non-NULL, the position in the function template |
2560 | /// specialization set where the function template specialization data will |
2561 | /// be inserted. |
2562 | /// |
2563 | /// \param TSK the kind of template specialization this is. |
2564 | /// |
2565 | /// \param TemplateArgsAsWritten location info of template arguments. |
2566 | /// |
2567 | /// \param PointOfInstantiation point at which the function template |
2568 | /// specialization was first instantiated. |
2569 | void setFunctionTemplateSpecialization(FunctionTemplateDecl *Template, |
2570 | const TemplateArgumentList *TemplateArgs, |
2571 | void *InsertPos, |
2572 | TemplateSpecializationKind TSK = TSK_ImplicitInstantiation, |
2573 | const TemplateArgumentListInfo *TemplateArgsAsWritten = nullptr, |
2574 | SourceLocation PointOfInstantiation = SourceLocation()) { |
2575 | setFunctionTemplateSpecialization(getASTContext(), Template, TemplateArgs, |
2576 | InsertPos, TSK, TemplateArgsAsWritten, |
2577 | PointOfInstantiation); |
2578 | } |
2579 | |
2580 | /// Specifies that this function declaration is actually a |
2581 | /// dependent function template specialization. |
2582 | void setDependentTemplateSpecialization(ASTContext &Context, |
2583 | const UnresolvedSetImpl &Templates, |
2584 | const TemplateArgumentListInfo &TemplateArgs); |
2585 | |
2586 | DependentFunctionTemplateSpecializationInfo * |
2587 | getDependentSpecializationInfo() const; |
2588 | |
2589 | /// Determine what kind of template instantiation this function |
2590 | /// represents. |
2591 | TemplateSpecializationKind getTemplateSpecializationKind() const; |
2592 | |
2593 | /// Determine the kind of template specialization this function represents |
2594 | /// for the purpose of template instantiation. |
2595 | TemplateSpecializationKind |
2596 | getTemplateSpecializationKindForInstantiation() const; |
2597 | |
2598 | /// Determine what kind of template instantiation this function |
2599 | /// represents. |
2600 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK, |
2601 | SourceLocation PointOfInstantiation = SourceLocation()); |
2602 | |
2603 | /// Retrieve the (first) point of instantiation of a function template |
2604 | /// specialization or a member of a class template specialization. |
2605 | /// |
2606 | /// \returns the first point of instantiation, if this function was |
2607 | /// instantiated from a template; otherwise, returns an invalid source |
2608 | /// location. |
2609 | SourceLocation getPointOfInstantiation() const; |
2610 | |
2611 | /// Determine whether this is or was instantiated from an out-of-line |
2612 | /// definition of a member function. |
2613 | bool isOutOfLine() const override; |
2614 | |
2615 | /// Identify a memory copying or setting function. |
2616 | /// If the given function is a memory copy or setting function, returns |
2617 | /// the corresponding Builtin ID. If the function is not a memory function, |
2618 | /// returns 0. |
2619 | unsigned getMemoryFunctionKind() const; |
2620 | |
2621 | /// Returns ODRHash of the function. This value is calculated and |
2622 | /// stored on first call, then the stored value returned on the other calls. |
2623 | unsigned getODRHash(); |
2624 | |
2625 | /// Returns cached ODRHash of the function. This must have been previously |
2626 | /// computed and stored. |
2627 | unsigned getODRHash() const; |
2628 | |
2629 | // Implement isa/cast/dyncast/etc. |
2630 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2631 | static bool classofKind(Kind K) { |
2632 | return K >= firstFunction && K <= lastFunction; |
2633 | } |
2634 | static DeclContext *castToDeclContext(const FunctionDecl *D) { |
2635 | return static_cast<DeclContext *>(const_cast<FunctionDecl*>(D)); |
2636 | } |
2637 | static FunctionDecl *castFromDeclContext(const DeclContext *DC) { |
2638 | return static_cast<FunctionDecl *>(const_cast<DeclContext*>(DC)); |
2639 | } |
2640 | }; |
2641 | |
2642 | /// Represents a member of a struct/union/class. |
2643 | class FieldDecl : public DeclaratorDecl, public Mergeable<FieldDecl> { |
2644 | unsigned BitField : 1; |
2645 | unsigned Mutable : 1; |
2646 | mutable unsigned CachedFieldIndex : 30; |
2647 | |
2648 | /// The kinds of value we can store in InitializerOrBitWidth. |
2649 | /// |
2650 | /// Note that this is compatible with InClassInitStyle except for |
2651 | /// ISK_CapturedVLAType. |
2652 | enum InitStorageKind { |
2653 | /// If the pointer is null, there's nothing special. Otherwise, |
2654 | /// this is a bitfield and the pointer is the Expr* storing the |
2655 | /// bit-width. |
2656 | ISK_NoInit = (unsigned) ICIS_NoInit, |
2657 | |
2658 | /// The pointer is an (optional due to delayed parsing) Expr* |
2659 | /// holding the copy-initializer. |
2660 | ISK_InClassCopyInit = (unsigned) ICIS_CopyInit, |
2661 | |
2662 | /// The pointer is an (optional due to delayed parsing) Expr* |
2663 | /// holding the list-initializer. |
2664 | ISK_InClassListInit = (unsigned) ICIS_ListInit, |
2665 | |
2666 | /// The pointer is a VariableArrayType* that's been captured; |
2667 | /// the enclosing context is a lambda or captured statement. |
2668 | ISK_CapturedVLAType, |
2669 | }; |
2670 | |
2671 | /// If this is a bitfield with a default member initializer, this |
2672 | /// structure is used to represent the two expressions. |
2673 | struct InitAndBitWidth { |
2674 | Expr *Init; |
2675 | Expr *BitWidth; |
2676 | }; |
2677 | |
2678 | /// Storage for either the bit-width, the in-class initializer, or |
2679 | /// both (via InitAndBitWidth), or the captured variable length array bound. |
2680 | /// |
2681 | /// If the storage kind is ISK_InClassCopyInit or |
2682 | /// ISK_InClassListInit, but the initializer is null, then this |
2683 | /// field has an in-class initializer that has not yet been parsed |
2684 | /// and attached. |
2685 | // FIXME: Tail-allocate this to reduce the size of FieldDecl in the |
2686 | // overwhelmingly common case that we have none of these things. |
2687 | llvm::PointerIntPair<void *, 2, InitStorageKind> InitStorage; |
2688 | |
2689 | protected: |
2690 | FieldDecl(Kind DK, DeclContext *DC, SourceLocation StartLoc, |
2691 | SourceLocation IdLoc, IdentifierInfo *Id, |
2692 | QualType T, TypeSourceInfo *TInfo, Expr *BW, bool Mutable, |
2693 | InClassInitStyle InitStyle) |
2694 | : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc), |
2695 | BitField(false), Mutable(Mutable), CachedFieldIndex(0), |
2696 | InitStorage(nullptr, (InitStorageKind) InitStyle) { |
2697 | if (BW) |
2698 | setBitWidth(BW); |
2699 | } |
2700 | |
2701 | public: |
2702 | friend class ASTDeclReader; |
2703 | friend class ASTDeclWriter; |
2704 | |
2705 | static FieldDecl *Create(const ASTContext &C, DeclContext *DC, |
2706 | SourceLocation StartLoc, SourceLocation IdLoc, |
2707 | IdentifierInfo *Id, QualType T, |
2708 | TypeSourceInfo *TInfo, Expr *BW, bool Mutable, |
2709 | InClassInitStyle InitStyle); |
2710 | |
2711 | static FieldDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
2712 | |
2713 | /// Returns the index of this field within its record, |
2714 | /// as appropriate for passing to ASTRecordLayout::getFieldOffset. |
2715 | unsigned getFieldIndex() const; |
2716 | |
2717 | /// Determines whether this field is mutable (C++ only). |
2718 | bool isMutable() const { return Mutable; } |
2719 | |
2720 | /// Determines whether this field is a bitfield. |
2721 | bool isBitField() const { return BitField; } |
2722 | |
2723 | /// Determines whether this is an unnamed bitfield. |
2724 | bool isUnnamedBitfield() const { return isBitField() && !getDeclName(); } |
2725 | |
2726 | /// Determines whether this field is a |
2727 | /// representative for an anonymous struct or union. Such fields are |
2728 | /// unnamed and are implicitly generated by the implementation to |
2729 | /// store the data for the anonymous union or struct. |
2730 | bool isAnonymousStructOrUnion() const; |
2731 | |
2732 | Expr *getBitWidth() const { |
2733 | if (!BitField) |
2734 | return nullptr; |
2735 | void *Ptr = InitStorage.getPointer(); |
2736 | if (getInClassInitStyle()) |
2737 | return static_cast<InitAndBitWidth*>(Ptr)->BitWidth; |
2738 | return static_cast<Expr*>(Ptr); |
2739 | } |
2740 | |
2741 | unsigned getBitWidthValue(const ASTContext &Ctx) const; |
2742 | |
2743 | /// Set the bit-field width for this member. |
2744 | // Note: used by some clients (i.e., do not remove it). |
2745 | void setBitWidth(Expr *Width) { |
2746 | assert(!hasCapturedVLAType() && !BitField &&((!hasCapturedVLAType() && !BitField && "bit width or captured type already set" ) ? static_cast<void> (0) : __assert_fail ("!hasCapturedVLAType() && !BitField && \"bit width or captured type already set\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2747, __PRETTY_FUNCTION__)) |
2747 | "bit width or captured type already set")((!hasCapturedVLAType() && !BitField && "bit width or captured type already set" ) ? static_cast<void> (0) : __assert_fail ("!hasCapturedVLAType() && !BitField && \"bit width or captured type already set\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2747, __PRETTY_FUNCTION__)); |
2748 | assert(Width && "no bit width specified")((Width && "no bit width specified") ? static_cast< void> (0) : __assert_fail ("Width && \"no bit width specified\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2748, __PRETTY_FUNCTION__)); |
2749 | InitStorage.setPointer( |
2750 | InitStorage.getInt() |
2751 | ? new (getASTContext()) |
2752 | InitAndBitWidth{getInClassInitializer(), Width} |
2753 | : static_cast<void*>(Width)); |
2754 | BitField = true; |
2755 | } |
2756 | |
2757 | /// Remove the bit-field width from this member. |
2758 | // Note: used by some clients (i.e., do not remove it). |
2759 | void removeBitWidth() { |
2760 | assert(isBitField() && "no bitfield width to remove")((isBitField() && "no bitfield width to remove") ? static_cast <void> (0) : __assert_fail ("isBitField() && \"no bitfield width to remove\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2760, __PRETTY_FUNCTION__)); |
2761 | InitStorage.setPointer(getInClassInitializer()); |
2762 | BitField = false; |
2763 | } |
2764 | |
2765 | /// Is this a zero-length bit-field? Such bit-fields aren't really bit-fields |
2766 | /// at all and instead act as a separator between contiguous runs of other |
2767 | /// bit-fields. |
2768 | bool isZeroLengthBitField(const ASTContext &Ctx) const; |
2769 | |
2770 | /// Determine if this field is a subobject of zero size, that is, either a |
2771 | /// zero-length bit-field or a field of empty class type with the |
2772 | /// [[no_unique_address]] attribute. |
2773 | bool isZeroSize(const ASTContext &Ctx) const; |
2774 | |
2775 | /// Get the kind of (C++11) default member initializer that this field has. |
2776 | InClassInitStyle getInClassInitStyle() const { |
2777 | InitStorageKind storageKind = InitStorage.getInt(); |
2778 | return (storageKind == ISK_CapturedVLAType |
2779 | ? ICIS_NoInit : (InClassInitStyle) storageKind); |
2780 | } |
2781 | |
2782 | /// Determine whether this member has a C++11 default member initializer. |
2783 | bool hasInClassInitializer() const { |
2784 | return getInClassInitStyle() != ICIS_NoInit; |
2785 | } |
2786 | |
2787 | /// Get the C++11 default member initializer for this member, or null if one |
2788 | /// has not been set. If a valid declaration has a default member initializer, |
2789 | /// but this returns null, then we have not parsed and attached it yet. |
2790 | Expr *getInClassInitializer() const { |
2791 | if (!hasInClassInitializer()) |
2792 | return nullptr; |
2793 | void *Ptr = InitStorage.getPointer(); |
2794 | if (BitField) |
2795 | return static_cast<InitAndBitWidth*>(Ptr)->Init; |
2796 | return static_cast<Expr*>(Ptr); |
2797 | } |
2798 | |
2799 | /// Set the C++11 in-class initializer for this member. |
2800 | void setInClassInitializer(Expr *Init) { |
2801 | assert(hasInClassInitializer() && !getInClassInitializer())((hasInClassInitializer() && !getInClassInitializer() ) ? static_cast<void> (0) : __assert_fail ("hasInClassInitializer() && !getInClassInitializer()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2801, __PRETTY_FUNCTION__)); |
2802 | if (BitField) |
2803 | static_cast<InitAndBitWidth*>(InitStorage.getPointer())->Init = Init; |
2804 | else |
2805 | InitStorage.setPointer(Init); |
2806 | } |
2807 | |
2808 | /// Remove the C++11 in-class initializer from this member. |
2809 | void removeInClassInitializer() { |
2810 | assert(hasInClassInitializer() && "no initializer to remove")((hasInClassInitializer() && "no initializer to remove" ) ? static_cast<void> (0) : __assert_fail ("hasInClassInitializer() && \"no initializer to remove\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2810, __PRETTY_FUNCTION__)); |
2811 | InitStorage.setPointerAndInt(getBitWidth(), ISK_NoInit); |
2812 | } |
2813 | |
2814 | /// Determine whether this member captures the variable length array |
2815 | /// type. |
2816 | bool hasCapturedVLAType() const { |
2817 | return InitStorage.getInt() == ISK_CapturedVLAType; |
2818 | } |
2819 | |
2820 | /// Get the captured variable length array type. |
2821 | const VariableArrayType *getCapturedVLAType() const { |
2822 | return hasCapturedVLAType() ? static_cast<const VariableArrayType *>( |
2823 | InitStorage.getPointer()) |
2824 | : nullptr; |
2825 | } |
2826 | |
2827 | /// Set the captured variable length array type for this field. |
2828 | void setCapturedVLAType(const VariableArrayType *VLAType); |
2829 | |
2830 | /// Returns the parent of this field declaration, which |
2831 | /// is the struct in which this field is defined. |
2832 | const RecordDecl *getParent() const { |
2833 | return cast<RecordDecl>(getDeclContext()); |
2834 | } |
2835 | |
2836 | RecordDecl *getParent() { |
2837 | return cast<RecordDecl>(getDeclContext()); |
2838 | } |
2839 | |
2840 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
2841 | |
2842 | /// Retrieves the canonical declaration of this field. |
2843 | FieldDecl *getCanonicalDecl() override { return getFirstDecl(); } |
2844 | const FieldDecl *getCanonicalDecl() const { return getFirstDecl(); } |
2845 | |
2846 | // Implement isa/cast/dyncast/etc. |
2847 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2848 | static bool classofKind(Kind K) { return K >= firstField && K <= lastField; } |
2849 | }; |
2850 | |
2851 | /// An instance of this object exists for each enum constant |
2852 | /// that is defined. For example, in "enum X {a,b}", each of a/b are |
2853 | /// EnumConstantDecl's, X is an instance of EnumDecl, and the type of a/b is a |
2854 | /// TagType for the X EnumDecl. |
2855 | class EnumConstantDecl : public ValueDecl, public Mergeable<EnumConstantDecl> { |
2856 | Stmt *Init; // an integer constant expression |
2857 | llvm::APSInt Val; // The value. |
2858 | |
2859 | protected: |
2860 | EnumConstantDecl(DeclContext *DC, SourceLocation L, |
2861 | IdentifierInfo *Id, QualType T, Expr *E, |
2862 | const llvm::APSInt &V) |
2863 | : ValueDecl(EnumConstant, DC, L, Id, T), Init((Stmt*)E), Val(V) {} |
2864 | |
2865 | public: |
2866 | friend class StmtIteratorBase; |
2867 | |
2868 | static EnumConstantDecl *Create(ASTContext &C, EnumDecl *DC, |
2869 | SourceLocation L, IdentifierInfo *Id, |
2870 | QualType T, Expr *E, |
2871 | const llvm::APSInt &V); |
2872 | static EnumConstantDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
2873 | |
2874 | const Expr *getInitExpr() const { return (const Expr*) Init; } |
2875 | Expr *getInitExpr() { return (Expr*) Init; } |
2876 | const llvm::APSInt &getInitVal() const { return Val; } |
2877 | |
2878 | void setInitExpr(Expr *E) { Init = (Stmt*) E; } |
2879 | void setInitVal(const llvm::APSInt &V) { Val = V; } |
2880 | |
2881 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
2882 | |
2883 | /// Retrieves the canonical declaration of this enumerator. |
2884 | EnumConstantDecl *getCanonicalDecl() override { return getFirstDecl(); } |
2885 | const EnumConstantDecl *getCanonicalDecl() const { return getFirstDecl(); } |
2886 | |
2887 | // Implement isa/cast/dyncast/etc. |
2888 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2889 | static bool classofKind(Kind K) { return K == EnumConstant; } |
2890 | }; |
2891 | |
2892 | /// Represents a field injected from an anonymous union/struct into the parent |
2893 | /// scope. These are always implicit. |
2894 | class IndirectFieldDecl : public ValueDecl, |
2895 | public Mergeable<IndirectFieldDecl> { |
2896 | NamedDecl **Chaining; |
2897 | unsigned ChainingSize; |
2898 | |
2899 | IndirectFieldDecl(ASTContext &C, DeclContext *DC, SourceLocation L, |
2900 | DeclarationName N, QualType T, |
2901 | MutableArrayRef<NamedDecl *> CH); |
2902 | |
2903 | void anchor() override; |
2904 | |
2905 | public: |
2906 | friend class ASTDeclReader; |
2907 | |
2908 | static IndirectFieldDecl *Create(ASTContext &C, DeclContext *DC, |
2909 | SourceLocation L, IdentifierInfo *Id, |
2910 | QualType T, llvm::MutableArrayRef<NamedDecl *> CH); |
2911 | |
2912 | static IndirectFieldDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
2913 | |
2914 | using chain_iterator = ArrayRef<NamedDecl *>::const_iterator; |
2915 | |
2916 | ArrayRef<NamedDecl *> chain() const { |
2917 | return llvm::makeArrayRef(Chaining, ChainingSize); |
2918 | } |
2919 | chain_iterator chain_begin() const { return chain().begin(); } |
2920 | chain_iterator chain_end() const { return chain().end(); } |
2921 | |
2922 | unsigned getChainingSize() const { return ChainingSize; } |
2923 | |
2924 | FieldDecl *getAnonField() const { |
2925 | assert(chain().size() >= 2)((chain().size() >= 2) ? static_cast<void> (0) : __assert_fail ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2925, __PRETTY_FUNCTION__)); |
2926 | return cast<FieldDecl>(chain().back()); |
2927 | } |
2928 | |
2929 | VarDecl *getVarDecl() const { |
2930 | assert(chain().size() >= 2)((chain().size() >= 2) ? static_cast<void> (0) : __assert_fail ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 2930, __PRETTY_FUNCTION__)); |
2931 | return dyn_cast<VarDecl>(chain().front()); |
2932 | } |
2933 | |
2934 | IndirectFieldDecl *getCanonicalDecl() override { return getFirstDecl(); } |
2935 | const IndirectFieldDecl *getCanonicalDecl() const { return getFirstDecl(); } |
2936 | |
2937 | // Implement isa/cast/dyncast/etc. |
2938 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2939 | static bool classofKind(Kind K) { return K == IndirectField; } |
2940 | }; |
2941 | |
2942 | /// Represents a declaration of a type. |
2943 | class TypeDecl : public NamedDecl { |
2944 | friend class ASTContext; |
2945 | |
2946 | /// This indicates the Type object that represents |
2947 | /// this TypeDecl. It is a cache maintained by |
2948 | /// ASTContext::getTypedefType, ASTContext::getTagDeclType, and |
2949 | /// ASTContext::getTemplateTypeParmType, and TemplateTypeParmDecl. |
2950 | mutable const Type *TypeForDecl = nullptr; |
2951 | |
2952 | /// The start of the source range for this declaration. |
2953 | SourceLocation LocStart; |
2954 | |
2955 | void anchor() override; |
2956 | |
2957 | protected: |
2958 | TypeDecl(Kind DK, DeclContext *DC, SourceLocation L, IdentifierInfo *Id, |
2959 | SourceLocation StartL = SourceLocation()) |
2960 | : NamedDecl(DK, DC, L, Id), LocStart(StartL) {} |
2961 | |
2962 | public: |
2963 | // Low-level accessor. If you just want the type defined by this node, |
2964 | // check out ASTContext::getTypeDeclType or one of |
2965 | // ASTContext::getTypedefType, ASTContext::getRecordType, etc. if you |
2966 | // already know the specific kind of node this is. |
2967 | const Type *getTypeForDecl() const { return TypeForDecl; } |
2968 | void setTypeForDecl(const Type *TD) { TypeForDecl = TD; } |
2969 | |
2970 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LocStart; } |
2971 | void setLocStart(SourceLocation L) { LocStart = L; } |
2972 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
2973 | if (LocStart.isValid()) |
2974 | return SourceRange(LocStart, getLocation()); |
2975 | else |
2976 | return SourceRange(getLocation()); |
2977 | } |
2978 | |
2979 | // Implement isa/cast/dyncast/etc. |
2980 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2981 | static bool classofKind(Kind K) { return K >= firstType && K <= lastType; } |
2982 | }; |
2983 | |
2984 | /// Base class for declarations which introduce a typedef-name. |
2985 | class TypedefNameDecl : public TypeDecl, public Redeclarable<TypedefNameDecl> { |
2986 | struct alignas(8) ModedTInfo { |
2987 | TypeSourceInfo *first; |
2988 | QualType second; |
2989 | }; |
2990 | |
2991 | /// If int part is 0, we have not computed IsTransparentTag. |
2992 | /// Otherwise, IsTransparentTag is (getInt() >> 1). |
2993 | mutable llvm::PointerIntPair< |
2994 | llvm::PointerUnion<TypeSourceInfo *, ModedTInfo *>, 2> |
2995 | MaybeModedTInfo; |
2996 | |
2997 | void anchor() override; |
2998 | |
2999 | protected: |
3000 | TypedefNameDecl(Kind DK, ASTContext &C, DeclContext *DC, |
3001 | SourceLocation StartLoc, SourceLocation IdLoc, |
3002 | IdentifierInfo *Id, TypeSourceInfo *TInfo) |
3003 | : TypeDecl(DK, DC, IdLoc, Id, StartLoc), redeclarable_base(C), |
3004 | MaybeModedTInfo(TInfo, 0) {} |
3005 | |
3006 | using redeclarable_base = Redeclarable<TypedefNameDecl>; |
3007 | |
3008 | TypedefNameDecl *getNextRedeclarationImpl() override { |
3009 | return getNextRedeclaration(); |
3010 | } |
3011 | |
3012 | TypedefNameDecl *getPreviousDeclImpl() override { |
3013 | return getPreviousDecl(); |
3014 | } |
3015 | |
3016 | TypedefNameDecl *getMostRecentDeclImpl() override { |
3017 | return getMostRecentDecl(); |
3018 | } |
3019 | |
3020 | public: |
3021 | using redecl_range = redeclarable_base::redecl_range; |
3022 | using redecl_iterator = redeclarable_base::redecl_iterator; |
3023 | |
3024 | using redeclarable_base::redecls_begin; |
3025 | using redeclarable_base::redecls_end; |
3026 | using redeclarable_base::redecls; |
3027 | using redeclarable_base::getPreviousDecl; |
3028 | using redeclarable_base::getMostRecentDecl; |
3029 | using redeclarable_base::isFirstDecl; |
3030 | |
3031 | bool isModed() const { |
3032 | return MaybeModedTInfo.getPointer().is<ModedTInfo *>(); |
3033 | } |
3034 | |
3035 | TypeSourceInfo *getTypeSourceInfo() const { |
3036 | return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->first |
3037 | : MaybeModedTInfo.getPointer().get<TypeSourceInfo *>(); |
3038 | } |
3039 | |
3040 | QualType getUnderlyingType() const { |
3041 | return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->second |
3042 | : MaybeModedTInfo.getPointer() |
3043 | .get<TypeSourceInfo *>() |
3044 | ->getType(); |
3045 | } |
3046 | |
3047 | void setTypeSourceInfo(TypeSourceInfo *newType) { |
3048 | MaybeModedTInfo.setPointer(newType); |
3049 | } |
3050 | |
3051 | void setModedTypeSourceInfo(TypeSourceInfo *unmodedTSI, QualType modedTy) { |
3052 | MaybeModedTInfo.setPointer(new (getASTContext(), 8) |
3053 | ModedTInfo({unmodedTSI, modedTy})); |
3054 | } |
3055 | |
3056 | /// Retrieves the canonical declaration of this typedef-name. |
3057 | TypedefNameDecl *getCanonicalDecl() override { return getFirstDecl(); } |
3058 | const TypedefNameDecl *getCanonicalDecl() const { return getFirstDecl(); } |
3059 | |
3060 | /// Retrieves the tag declaration for which this is the typedef name for |
3061 | /// linkage purposes, if any. |
3062 | /// |
3063 | /// \param AnyRedecl Look for the tag declaration in any redeclaration of |
3064 | /// this typedef declaration. |
3065 | TagDecl *getAnonDeclWithTypedefName(bool AnyRedecl = false) const; |
3066 | |
3067 | /// Determines if this typedef shares a name and spelling location with its |
3068 | /// underlying tag type, as is the case with the NS_ENUM macro. |
3069 | bool isTransparentTag() const { |
3070 | if (MaybeModedTInfo.getInt()) |
3071 | return MaybeModedTInfo.getInt() & 0x2; |
3072 | return isTransparentTagSlow(); |
3073 | } |
3074 | |
3075 | // Implement isa/cast/dyncast/etc. |
3076 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3077 | static bool classofKind(Kind K) { |
3078 | return K >= firstTypedefName && K <= lastTypedefName; |
3079 | } |
3080 | |
3081 | private: |
3082 | bool isTransparentTagSlow() const; |
3083 | }; |
3084 | |
3085 | /// Represents the declaration of a typedef-name via the 'typedef' |
3086 | /// type specifier. |
3087 | class TypedefDecl : public TypedefNameDecl { |
3088 | TypedefDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
3089 | SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo) |
3090 | : TypedefNameDecl(Typedef, C, DC, StartLoc, IdLoc, Id, TInfo) {} |
3091 | |
3092 | public: |
3093 | static TypedefDecl *Create(ASTContext &C, DeclContext *DC, |
3094 | SourceLocation StartLoc, SourceLocation IdLoc, |
3095 | IdentifierInfo *Id, TypeSourceInfo *TInfo); |
3096 | static TypedefDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3097 | |
3098 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3099 | |
3100 | // Implement isa/cast/dyncast/etc. |
3101 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3102 | static bool classofKind(Kind K) { return K == Typedef; } |
3103 | }; |
3104 | |
3105 | /// Represents the declaration of a typedef-name via a C++11 |
3106 | /// alias-declaration. |
3107 | class TypeAliasDecl : public TypedefNameDecl { |
3108 | /// The template for which this is the pattern, if any. |
3109 | TypeAliasTemplateDecl *Template; |
3110 | |
3111 | TypeAliasDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
3112 | SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo) |
3113 | : TypedefNameDecl(TypeAlias, C, DC, StartLoc, IdLoc, Id, TInfo), |
3114 | Template(nullptr) {} |
3115 | |
3116 | public: |
3117 | static TypeAliasDecl *Create(ASTContext &C, DeclContext *DC, |
3118 | SourceLocation StartLoc, SourceLocation IdLoc, |
3119 | IdentifierInfo *Id, TypeSourceInfo *TInfo); |
3120 | static TypeAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3121 | |
3122 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3123 | |
3124 | TypeAliasTemplateDecl *getDescribedAliasTemplate() const { return Template; } |
3125 | void setDescribedAliasTemplate(TypeAliasTemplateDecl *TAT) { Template = TAT; } |
3126 | |
3127 | // Implement isa/cast/dyncast/etc. |
3128 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3129 | static bool classofKind(Kind K) { return K == TypeAlias; } |
3130 | }; |
3131 | |
3132 | /// Represents the declaration of a struct/union/class/enum. |
3133 | class TagDecl : public TypeDecl, |
3134 | public DeclContext, |
3135 | public Redeclarable<TagDecl> { |
3136 | // This class stores some data in DeclContext::TagDeclBits |
3137 | // to save some space. Use the provided accessors to access it. |
3138 | public: |
3139 | // This is really ugly. |
3140 | using TagKind = TagTypeKind; |
3141 | |
3142 | private: |
3143 | SourceRange BraceRange; |
3144 | |
3145 | // A struct representing syntactic qualifier info, |
3146 | // to be used for the (uncommon) case of out-of-line declarations. |
3147 | using ExtInfo = QualifierInfo; |
3148 | |
3149 | /// If the (out-of-line) tag declaration name |
3150 | /// is qualified, it points to the qualifier info (nns and range); |
3151 | /// otherwise, if the tag declaration is anonymous and it is part of |
3152 | /// a typedef or alias, it points to the TypedefNameDecl (used for mangling); |
3153 | /// otherwise, if the tag declaration is anonymous and it is used as a |
3154 | /// declaration specifier for variables, it points to the first VarDecl (used |
3155 | /// for mangling); |
3156 | /// otherwise, it is a null (TypedefNameDecl) pointer. |
3157 | llvm::PointerUnion<TypedefNameDecl *, ExtInfo *> TypedefNameDeclOrQualifier; |
3158 | |
3159 | bool hasExtInfo() const { return TypedefNameDeclOrQualifier.is<ExtInfo *>(); } |
3160 | ExtInfo *getExtInfo() { return TypedefNameDeclOrQualifier.get<ExtInfo *>(); } |
3161 | const ExtInfo *getExtInfo() const { |
3162 | return TypedefNameDeclOrQualifier.get<ExtInfo *>(); |
3163 | } |
3164 | |
3165 | protected: |
3166 | TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC, |
3167 | SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl, |
3168 | SourceLocation StartL); |
3169 | |
3170 | using redeclarable_base = Redeclarable<TagDecl>; |
3171 | |
3172 | TagDecl *getNextRedeclarationImpl() override { |
3173 | return getNextRedeclaration(); |
3174 | } |
3175 | |
3176 | TagDecl *getPreviousDeclImpl() override { |
3177 | return getPreviousDecl(); |
3178 | } |
3179 | |
3180 | TagDecl *getMostRecentDeclImpl() override { |
3181 | return getMostRecentDecl(); |
3182 | } |
3183 | |
3184 | /// Completes the definition of this tag declaration. |
3185 | /// |
3186 | /// This is a helper function for derived classes. |
3187 | void completeDefinition(); |
3188 | |
3189 | /// True if this decl is currently being defined. |
3190 | void setBeingDefined(bool V = true) { TagDeclBits.IsBeingDefined = V; } |
3191 | |
3192 | /// Indicates whether it is possible for declarations of this kind |
3193 | /// to have an out-of-date definition. |
3194 | /// |
3195 | /// This option is only enabled when modules are enabled. |
3196 | void setMayHaveOutOfDateDef(bool V = true) { |
3197 | TagDeclBits.MayHaveOutOfDateDef = V; |
3198 | } |
3199 | |
3200 | public: |
3201 | friend class ASTDeclReader; |
3202 | friend class ASTDeclWriter; |
3203 | |
3204 | using redecl_range = redeclarable_base::redecl_range; |
3205 | using redecl_iterator = redeclarable_base::redecl_iterator; |
3206 | |
3207 | using redeclarable_base::redecls_begin; |
3208 | using redeclarable_base::redecls_end; |
3209 | using redeclarable_base::redecls; |
3210 | using redeclarable_base::getPreviousDecl; |
3211 | using redeclarable_base::getMostRecentDecl; |
3212 | using redeclarable_base::isFirstDecl; |
3213 | |
3214 | SourceRange getBraceRange() const { return BraceRange; } |
3215 | void setBraceRange(SourceRange R) { BraceRange = R; } |
3216 | |
3217 | /// Return SourceLocation representing start of source |
3218 | /// range ignoring outer template declarations. |
3219 | SourceLocation getInnerLocStart() const { return getBeginLoc(); } |
3220 | |
3221 | /// Return SourceLocation representing start of source |
3222 | /// range taking into account any outer template declarations. |
3223 | SourceLocation getOuterLocStart() const; |
3224 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3225 | |
3226 | TagDecl *getCanonicalDecl() override; |
3227 | const TagDecl *getCanonicalDecl() const { |
3228 | return const_cast<TagDecl*>(this)->getCanonicalDecl(); |
3229 | } |
3230 | |
3231 | /// Return true if this declaration is a completion definition of the type. |
3232 | /// Provided for consistency. |
3233 | bool isThisDeclarationADefinition() const { |
3234 | return isCompleteDefinition(); |
3235 | } |
3236 | |
3237 | /// Return true if this decl has its body fully specified. |
3238 | bool isCompleteDefinition() const { return TagDeclBits.IsCompleteDefinition; } |
3239 | |
3240 | /// True if this decl has its body fully specified. |
3241 | void setCompleteDefinition(bool V = true) { |
3242 | TagDeclBits.IsCompleteDefinition = V; |
3243 | } |
3244 | |
3245 | /// Return true if this complete decl is |
3246 | /// required to be complete for some existing use. |
3247 | bool isCompleteDefinitionRequired() const { |
3248 | return TagDeclBits.IsCompleteDefinitionRequired; |
3249 | } |
3250 | |
3251 | /// True if this complete decl is |
3252 | /// required to be complete for some existing use. |
3253 | void setCompleteDefinitionRequired(bool V = true) { |
3254 | TagDeclBits.IsCompleteDefinitionRequired = V; |
3255 | } |
3256 | |
3257 | /// Return true if this decl is currently being defined. |
3258 | bool isBeingDefined() const { return TagDeclBits.IsBeingDefined; } |
3259 | |
3260 | /// True if this tag declaration is "embedded" (i.e., defined or declared |
3261 | /// for the very first time) in the syntax of a declarator. |
3262 | bool isEmbeddedInDeclarator() const { |
3263 | return TagDeclBits.IsEmbeddedInDeclarator; |
3264 | } |
3265 | |
3266 | /// True if this tag declaration is "embedded" (i.e., defined or declared |
3267 | /// for the very first time) in the syntax of a declarator. |
3268 | void setEmbeddedInDeclarator(bool isInDeclarator) { |
3269 | TagDeclBits.IsEmbeddedInDeclarator = isInDeclarator; |
3270 | } |
3271 | |
3272 | /// True if this tag is free standing, e.g. "struct foo;". |
3273 | bool isFreeStanding() const { return TagDeclBits.IsFreeStanding; } |
3274 | |
3275 | /// True if this tag is free standing, e.g. "struct foo;". |
3276 | void setFreeStanding(bool isFreeStanding = true) { |
3277 | TagDeclBits.IsFreeStanding = isFreeStanding; |
3278 | } |
3279 | |
3280 | /// Indicates whether it is possible for declarations of this kind |
3281 | /// to have an out-of-date definition. |
3282 | /// |
3283 | /// This option is only enabled when modules are enabled. |
3284 | bool mayHaveOutOfDateDef() const { return TagDeclBits.MayHaveOutOfDateDef; } |
3285 | |
3286 | /// Whether this declaration declares a type that is |
3287 | /// dependent, i.e., a type that somehow depends on template |
3288 | /// parameters. |
3289 | bool isDependentType() const { return isDependentContext(); } |
3290 | |
3291 | /// Starts the definition of this tag declaration. |
3292 | /// |
3293 | /// This method should be invoked at the beginning of the definition |
3294 | /// of this tag declaration. It will set the tag type into a state |
3295 | /// where it is in the process of being defined. |
3296 | void startDefinition(); |
3297 | |
3298 | /// Returns the TagDecl that actually defines this |
3299 | /// struct/union/class/enum. When determining whether or not a |
3300 | /// struct/union/class/enum has a definition, one should use this |
3301 | /// method as opposed to 'isDefinition'. 'isDefinition' indicates |
3302 | /// whether or not a specific TagDecl is defining declaration, not |
3303 | /// whether or not the struct/union/class/enum type is defined. |
3304 | /// This method returns NULL if there is no TagDecl that defines |
3305 | /// the struct/union/class/enum. |
3306 | TagDecl *getDefinition() const; |
3307 | |
3308 | StringRef getKindName() const { |
3309 | return TypeWithKeyword::getTagTypeKindName(getTagKind()); |
3310 | } |
3311 | |
3312 | TagKind getTagKind() const { |
3313 | return static_cast<TagKind>(TagDeclBits.TagDeclKind); |
3314 | } |
3315 | |
3316 | void setTagKind(TagKind TK) { TagDeclBits.TagDeclKind = TK; } |
3317 | |
3318 | bool isStruct() const { return getTagKind() == TTK_Struct; } |
3319 | bool isInterface() const { return getTagKind() == TTK_Interface; } |
3320 | bool isClass() const { return getTagKind() == TTK_Class; } |
3321 | bool isUnion() const { return getTagKind() == TTK_Union; } |
3322 | bool isEnum() const { return getTagKind() == TTK_Enum; } |
3323 | |
3324 | /// Is this tag type named, either directly or via being defined in |
3325 | /// a typedef of this type? |
3326 | /// |
3327 | /// C++11 [basic.link]p8: |
3328 | /// A type is said to have linkage if and only if: |
3329 | /// - it is a class or enumeration type that is named (or has a |
3330 | /// name for linkage purposes) and the name has linkage; ... |
3331 | /// C++11 [dcl.typedef]p9: |
3332 | /// If the typedef declaration defines an unnamed class (or enum), |
3333 | /// the first typedef-name declared by the declaration to be that |
3334 | /// class type (or enum type) is used to denote the class type (or |
3335 | /// enum type) for linkage purposes only. |
3336 | /// |
3337 | /// C does not have an analogous rule, but the same concept is |
3338 | /// nonetheless useful in some places. |
3339 | bool hasNameForLinkage() const { |
3340 | return (getDeclName() || getTypedefNameForAnonDecl()); |
3341 | } |
3342 | |
3343 | TypedefNameDecl *getTypedefNameForAnonDecl() const { |
3344 | return hasExtInfo() ? nullptr |
3345 | : TypedefNameDeclOrQualifier.get<TypedefNameDecl *>(); |
3346 | } |
3347 | |
3348 | void setTypedefNameForAnonDecl(TypedefNameDecl *TDD); |
3349 | |
3350 | /// Retrieve the nested-name-specifier that qualifies the name of this |
3351 | /// declaration, if it was present in the source. |
3352 | NestedNameSpecifier *getQualifier() const { |
3353 | return hasExtInfo() ? getExtInfo()->QualifierLoc.getNestedNameSpecifier() |
3354 | : nullptr; |
3355 | } |
3356 | |
3357 | /// Retrieve the nested-name-specifier (with source-location |
3358 | /// information) that qualifies the name of this declaration, if it was |
3359 | /// present in the source. |
3360 | NestedNameSpecifierLoc getQualifierLoc() const { |
3361 | return hasExtInfo() ? getExtInfo()->QualifierLoc |
3362 | : NestedNameSpecifierLoc(); |
3363 | } |
3364 | |
3365 | void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc); |
3366 | |
3367 | unsigned getNumTemplateParameterLists() const { |
3368 | return hasExtInfo() ? getExtInfo()->NumTemplParamLists : 0; |
3369 | } |
3370 | |
3371 | TemplateParameterList *getTemplateParameterList(unsigned i) const { |
3372 | assert(i < getNumTemplateParameterLists())((i < getNumTemplateParameterLists()) ? static_cast<void > (0) : __assert_fail ("i < getNumTemplateParameterLists()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 3372, __PRETTY_FUNCTION__)); |
3373 | return getExtInfo()->TemplParamLists[i]; |
3374 | } |
3375 | |
3376 | void setTemplateParameterListsInfo(ASTContext &Context, |
3377 | ArrayRef<TemplateParameterList *> TPLists); |
3378 | |
3379 | // Implement isa/cast/dyncast/etc. |
3380 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3381 | static bool classofKind(Kind K) { return K >= firstTag && K <= lastTag; } |
3382 | |
3383 | static DeclContext *castToDeclContext(const TagDecl *D) { |
3384 | return static_cast<DeclContext *>(const_cast<TagDecl*>(D)); |
3385 | } |
3386 | |
3387 | static TagDecl *castFromDeclContext(const DeclContext *DC) { |
3388 | return static_cast<TagDecl *>(const_cast<DeclContext*>(DC)); |
3389 | } |
3390 | }; |
3391 | |
3392 | /// Represents an enum. In C++11, enums can be forward-declared |
3393 | /// with a fixed underlying type, and in C we allow them to be forward-declared |
3394 | /// with no underlying type as an extension. |
3395 | class EnumDecl : public TagDecl { |
3396 | // This class stores some data in DeclContext::EnumDeclBits |
3397 | // to save some space. Use the provided accessors to access it. |
3398 | |
3399 | /// This represent the integer type that the enum corresponds |
3400 | /// to for code generation purposes. Note that the enumerator constants may |
3401 | /// have a different type than this does. |
3402 | /// |
3403 | /// If the underlying integer type was explicitly stated in the source |
3404 | /// code, this is a TypeSourceInfo* for that type. Otherwise this type |
3405 | /// was automatically deduced somehow, and this is a Type*. |
3406 | /// |
3407 | /// Normally if IsFixed(), this would contain a TypeSourceInfo*, but in |
3408 | /// some cases it won't. |
3409 | /// |
3410 | /// The underlying type of an enumeration never has any qualifiers, so |
3411 | /// we can get away with just storing a raw Type*, and thus save an |
3412 | /// extra pointer when TypeSourceInfo is needed. |
3413 | llvm::PointerUnion<const Type *, TypeSourceInfo *> IntegerType; |
3414 | |
3415 | /// The integer type that values of this type should |
3416 | /// promote to. In C, enumerators are generally of an integer type |
3417 | /// directly, but gcc-style large enumerators (and all enumerators |
3418 | /// in C++) are of the enum type instead. |
3419 | QualType PromotionType; |
3420 | |
3421 | /// If this enumeration is an instantiation of a member enumeration |
3422 | /// of a class template specialization, this is the member specialization |
3423 | /// information. |
3424 | MemberSpecializationInfo *SpecializationInfo = nullptr; |
3425 | |
3426 | /// Store the ODRHash after first calculation. |
3427 | /// The corresponding flag HasODRHash is in EnumDeclBits |
3428 | /// and can be accessed with the provided accessors. |
3429 | unsigned ODRHash; |
3430 | |
3431 | EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
3432 | SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl, |
3433 | bool Scoped, bool ScopedUsingClassTag, bool Fixed); |
3434 | |
3435 | void anchor() override; |
3436 | |
3437 | void setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED, |
3438 | TemplateSpecializationKind TSK); |
3439 | |
3440 | /// Sets the width in bits required to store all the |
3441 | /// non-negative enumerators of this enum. |
3442 | void setNumPositiveBits(unsigned Num) { |
3443 | EnumDeclBits.NumPositiveBits = Num; |
3444 | assert(EnumDeclBits.NumPositiveBits == Num && "can't store this bitcount")((EnumDeclBits.NumPositiveBits == Num && "can't store this bitcount" ) ? static_cast<void> (0) : __assert_fail ("EnumDeclBits.NumPositiveBits == Num && \"can't store this bitcount\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 3444, __PRETTY_FUNCTION__)); |
3445 | } |
3446 | |
3447 | /// Returns the width in bits required to store all the |
3448 | /// negative enumerators of this enum. (see getNumNegativeBits) |
3449 | void setNumNegativeBits(unsigned Num) { EnumDeclBits.NumNegativeBits = Num; } |
3450 | |
3451 | /// True if this tag declaration is a scoped enumeration. Only |
3452 | /// possible in C++11 mode. |
3453 | void setScoped(bool Scoped = true) { EnumDeclBits.IsScoped = Scoped; } |
3454 | |
3455 | /// If this tag declaration is a scoped enum, |
3456 | /// then this is true if the scoped enum was declared using the class |
3457 | /// tag, false if it was declared with the struct tag. No meaning is |
3458 | /// associated if this tag declaration is not a scoped enum. |
3459 | void setScopedUsingClassTag(bool ScopedUCT = true) { |
3460 | EnumDeclBits.IsScopedUsingClassTag = ScopedUCT; |
3461 | } |
3462 | |
3463 | /// True if this is an Objective-C, C++11, or |
3464 | /// Microsoft-style enumeration with a fixed underlying type. |
3465 | void setFixed(bool Fixed = true) { EnumDeclBits.IsFixed = Fixed; } |
3466 | |
3467 | /// True if a valid hash is stored in ODRHash. |
3468 | bool hasODRHash() const { return EnumDeclBits.HasODRHash; } |
3469 | void setHasODRHash(bool Hash = true) { EnumDeclBits.HasODRHash = Hash; } |
3470 | |
3471 | public: |
3472 | friend class ASTDeclReader; |
3473 | |
3474 | EnumDecl *getCanonicalDecl() override { |
3475 | return cast<EnumDecl>(TagDecl::getCanonicalDecl()); |
3476 | } |
3477 | const EnumDecl *getCanonicalDecl() const { |
3478 | return const_cast<EnumDecl*>(this)->getCanonicalDecl(); |
3479 | } |
3480 | |
3481 | EnumDecl *getPreviousDecl() { |
3482 | return cast_or_null<EnumDecl>( |
3483 | static_cast<TagDecl *>(this)->getPreviousDecl()); |
3484 | } |
3485 | const EnumDecl *getPreviousDecl() const { |
3486 | return const_cast<EnumDecl*>(this)->getPreviousDecl(); |
3487 | } |
3488 | |
3489 | EnumDecl *getMostRecentDecl() { |
3490 | return cast<EnumDecl>(static_cast<TagDecl *>(this)->getMostRecentDecl()); |
3491 | } |
3492 | const EnumDecl *getMostRecentDecl() const { |
3493 | return const_cast<EnumDecl*>(this)->getMostRecentDecl(); |
3494 | } |
3495 | |
3496 | EnumDecl *getDefinition() const { |
3497 | return cast_or_null<EnumDecl>(TagDecl::getDefinition()); |
3498 | } |
3499 | |
3500 | static EnumDecl *Create(ASTContext &C, DeclContext *DC, |
3501 | SourceLocation StartLoc, SourceLocation IdLoc, |
3502 | IdentifierInfo *Id, EnumDecl *PrevDecl, |
3503 | bool IsScoped, bool IsScopedUsingClassTag, |
3504 | bool IsFixed); |
3505 | static EnumDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3506 | |
3507 | /// When created, the EnumDecl corresponds to a |
3508 | /// forward-declared enum. This method is used to mark the |
3509 | /// declaration as being defined; its enumerators have already been |
3510 | /// added (via DeclContext::addDecl). NewType is the new underlying |
3511 | /// type of the enumeration type. |
3512 | void completeDefinition(QualType NewType, |
3513 | QualType PromotionType, |
3514 | unsigned NumPositiveBits, |
3515 | unsigned NumNegativeBits); |
3516 | |
3517 | // Iterates through the enumerators of this enumeration. |
3518 | using enumerator_iterator = specific_decl_iterator<EnumConstantDecl>; |
3519 | using enumerator_range = |
3520 | llvm::iterator_range<specific_decl_iterator<EnumConstantDecl>>; |
3521 | |
3522 | enumerator_range enumerators() const { |
3523 | return enumerator_range(enumerator_begin(), enumerator_end()); |
3524 | } |
3525 | |
3526 | enumerator_iterator enumerator_begin() const { |
3527 | const EnumDecl *E = getDefinition(); |
3528 | if (!E) |
3529 | E = this; |
3530 | return enumerator_iterator(E->decls_begin()); |
3531 | } |
3532 | |
3533 | enumerator_iterator enumerator_end() const { |
3534 | const EnumDecl *E = getDefinition(); |
3535 | if (!E) |
3536 | E = this; |
3537 | return enumerator_iterator(E->decls_end()); |
3538 | } |
3539 | |
3540 | /// Return the integer type that enumerators should promote to. |
3541 | QualType getPromotionType() const { return PromotionType; } |
3542 | |
3543 | /// Set the promotion type. |
3544 | void setPromotionType(QualType T) { PromotionType = T; } |
3545 | |
3546 | /// Return the integer type this enum decl corresponds to. |
3547 | /// This returns a null QualType for an enum forward definition with no fixed |
3548 | /// underlying type. |
3549 | QualType getIntegerType() const { |
3550 | if (!IntegerType) |
3551 | return QualType(); |
3552 | if (const Type *T = IntegerType.dyn_cast<const Type*>()) |
3553 | return QualType(T, 0); |
3554 | return IntegerType.get<TypeSourceInfo*>()->getType().getUnqualifiedType(); |
3555 | } |
3556 | |
3557 | /// Set the underlying integer type. |
3558 | void setIntegerType(QualType T) { IntegerType = T.getTypePtrOrNull(); } |
3559 | |
3560 | /// Set the underlying integer type source info. |
3561 | void setIntegerTypeSourceInfo(TypeSourceInfo *TInfo) { IntegerType = TInfo; } |
3562 | |
3563 | /// Return the type source info for the underlying integer type, |
3564 | /// if no type source info exists, return 0. |
3565 | TypeSourceInfo *getIntegerTypeSourceInfo() const { |
3566 | return IntegerType.dyn_cast<TypeSourceInfo*>(); |
3567 | } |
3568 | |
3569 | /// Retrieve the source range that covers the underlying type if |
3570 | /// specified. |
3571 | SourceRange getIntegerTypeRange() const LLVM_READONLY__attribute__((__pure__)); |
3572 | |
3573 | /// Returns the width in bits required to store all the |
3574 | /// non-negative enumerators of this enum. |
3575 | unsigned getNumPositiveBits() const { return EnumDeclBits.NumPositiveBits; } |
3576 | |
3577 | /// Returns the width in bits required to store all the |
3578 | /// negative enumerators of this enum. These widths include |
3579 | /// the rightmost leading 1; that is: |
3580 | /// |
3581 | /// MOST NEGATIVE ENUMERATOR PATTERN NUM NEGATIVE BITS |
3582 | /// ------------------------ ------- ----------------- |
3583 | /// -1 1111111 1 |
3584 | /// -10 1110110 5 |
3585 | /// -101 1001011 8 |
3586 | unsigned getNumNegativeBits() const { return EnumDeclBits.NumNegativeBits; } |
3587 | |
3588 | /// Returns true if this is a C++11 scoped enumeration. |
3589 | bool isScoped() const { return EnumDeclBits.IsScoped; } |
3590 | |
3591 | /// Returns true if this is a C++11 scoped enumeration. |
3592 | bool isScopedUsingClassTag() const { |
3593 | return EnumDeclBits.IsScopedUsingClassTag; |
3594 | } |
3595 | |
3596 | /// Returns true if this is an Objective-C, C++11, or |
3597 | /// Microsoft-style enumeration with a fixed underlying type. |
3598 | bool isFixed() const { return EnumDeclBits.IsFixed; } |
3599 | |
3600 | unsigned getODRHash(); |
3601 | |
3602 | /// Returns true if this can be considered a complete type. |
3603 | bool isComplete() const { |
3604 | // IntegerType is set for fixed type enums and non-fixed but implicitly |
3605 | // int-sized Microsoft enums. |
3606 | return isCompleteDefinition() || IntegerType; |
3607 | } |
3608 | |
3609 | /// Returns true if this enum is either annotated with |
3610 | /// enum_extensibility(closed) or isn't annotated with enum_extensibility. |
3611 | bool isClosed() const; |
3612 | |
3613 | /// Returns true if this enum is annotated with flag_enum and isn't annotated |
3614 | /// with enum_extensibility(open). |
3615 | bool isClosedFlag() const; |
3616 | |
3617 | /// Returns true if this enum is annotated with neither flag_enum nor |
3618 | /// enum_extensibility(open). |
3619 | bool isClosedNonFlag() const; |
3620 | |
3621 | /// Retrieve the enum definition from which this enumeration could |
3622 | /// be instantiated, if it is an instantiation (rather than a non-template). |
3623 | EnumDecl *getTemplateInstantiationPattern() const; |
3624 | |
3625 | /// Returns the enumeration (declared within the template) |
3626 | /// from which this enumeration type was instantiated, or NULL if |
3627 | /// this enumeration was not instantiated from any template. |
3628 | EnumDecl *getInstantiatedFromMemberEnum() const; |
3629 | |
3630 | /// If this enumeration is a member of a specialization of a |
3631 | /// templated class, determine what kind of template specialization |
3632 | /// or instantiation this is. |
3633 | TemplateSpecializationKind getTemplateSpecializationKind() const; |
3634 | |
3635 | /// For an enumeration member that was instantiated from a member |
3636 | /// enumeration of a templated class, set the template specialiation kind. |
3637 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK, |
3638 | SourceLocation PointOfInstantiation = SourceLocation()); |
3639 | |
3640 | /// If this enumeration is an instantiation of a member enumeration of |
3641 | /// a class template specialization, retrieves the member specialization |
3642 | /// information. |
3643 | MemberSpecializationInfo *getMemberSpecializationInfo() const { |
3644 | return SpecializationInfo; |
3645 | } |
3646 | |
3647 | /// Specify that this enumeration is an instantiation of the |
3648 | /// member enumeration ED. |
3649 | void setInstantiationOfMemberEnum(EnumDecl *ED, |
3650 | TemplateSpecializationKind TSK) { |
3651 | setInstantiationOfMemberEnum(getASTContext(), ED, TSK); |
3652 | } |
3653 | |
3654 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3655 | static bool classofKind(Kind K) { return K == Enum; } |
3656 | }; |
3657 | |
3658 | /// Represents a struct/union/class. For example: |
3659 | /// struct X; // Forward declaration, no "body". |
3660 | /// union Y { int A, B; }; // Has body with members A and B (FieldDecls). |
3661 | /// This decl will be marked invalid if *any* members are invalid. |
3662 | class RecordDecl : public TagDecl { |
3663 | // This class stores some data in DeclContext::RecordDeclBits |
3664 | // to save some space. Use the provided accessors to access it. |
3665 | public: |
3666 | friend class DeclContext; |
3667 | /// Enum that represents the different ways arguments are passed to and |
3668 | /// returned from function calls. This takes into account the target-specific |
3669 | /// and version-specific rules along with the rules determined by the |
3670 | /// language. |
3671 | enum ArgPassingKind : unsigned { |
3672 | /// The argument of this type can be passed directly in registers. |
3673 | APK_CanPassInRegs, |
3674 | |
3675 | /// The argument of this type cannot be passed directly in registers. |
3676 | /// Records containing this type as a subobject are not forced to be passed |
3677 | /// indirectly. This value is used only in C++. This value is required by |
3678 | /// C++ because, in uncommon situations, it is possible for a class to have |
3679 | /// only trivial copy/move constructors even when one of its subobjects has |
3680 | /// a non-trivial copy/move constructor (if e.g. the corresponding copy/move |
3681 | /// constructor in the derived class is deleted). |
3682 | APK_CannotPassInRegs, |
3683 | |
3684 | /// The argument of this type cannot be passed directly in registers. |
3685 | /// Records containing this type as a subobject are forced to be passed |
3686 | /// indirectly. |
3687 | APK_CanNeverPassInRegs |
3688 | }; |
3689 | |
3690 | protected: |
3691 | RecordDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC, |
3692 | SourceLocation StartLoc, SourceLocation IdLoc, |
3693 | IdentifierInfo *Id, RecordDecl *PrevDecl); |
3694 | |
3695 | public: |
3696 | static RecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC, |
3697 | SourceLocation StartLoc, SourceLocation IdLoc, |
3698 | IdentifierInfo *Id, RecordDecl* PrevDecl = nullptr); |
3699 | static RecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID); |
3700 | |
3701 | RecordDecl *getPreviousDecl() { |
3702 | return cast_or_null<RecordDecl>( |
3703 | static_cast<TagDecl *>(this)->getPreviousDecl()); |
3704 | } |
3705 | const RecordDecl *getPreviousDecl() const { |
3706 | return const_cast<RecordDecl*>(this)->getPreviousDecl(); |
3707 | } |
3708 | |
3709 | RecordDecl *getMostRecentDecl() { |
3710 | return cast<RecordDecl>(static_cast<TagDecl *>(this)->getMostRecentDecl()); |
3711 | } |
3712 | const RecordDecl *getMostRecentDecl() const { |
3713 | return const_cast<RecordDecl*>(this)->getMostRecentDecl(); |
3714 | } |
3715 | |
3716 | bool hasFlexibleArrayMember() const { |
3717 | return RecordDeclBits.HasFlexibleArrayMember; |
3718 | } |
3719 | |
3720 | void setHasFlexibleArrayMember(bool V) { |
3721 | RecordDeclBits.HasFlexibleArrayMember = V; |
3722 | } |
3723 | |
3724 | /// Whether this is an anonymous struct or union. To be an anonymous |
3725 | /// struct or union, it must have been declared without a name and |
3726 | /// there must be no objects of this type declared, e.g., |
3727 | /// @code |
3728 | /// union { int i; float f; }; |
3729 | /// @endcode |
3730 | /// is an anonymous union but neither of the following are: |
3731 | /// @code |
3732 | /// union X { int i; float f; }; |
3733 | /// union { int i; float f; } obj; |
3734 | /// @endcode |
3735 | bool isAnonymousStructOrUnion() const { |
3736 | return RecordDeclBits.AnonymousStructOrUnion; |
3737 | } |
3738 | |
3739 | void setAnonymousStructOrUnion(bool Anon) { |
3740 | RecordDeclBits.AnonymousStructOrUnion = Anon; |
3741 | } |
3742 | |
3743 | bool hasObjectMember() const { return RecordDeclBits.HasObjectMember; } |
3744 | void setHasObjectMember(bool val) { RecordDeclBits.HasObjectMember = val; } |
3745 | |
3746 | bool hasVolatileMember() const { return RecordDeclBits.HasVolatileMember; } |
3747 | |
3748 | void setHasVolatileMember(bool val) { |
3749 | RecordDeclBits.HasVolatileMember = val; |
3750 | } |
3751 | |
3752 | bool hasLoadedFieldsFromExternalStorage() const { |
3753 | return RecordDeclBits.LoadedFieldsFromExternalStorage; |
3754 | } |
3755 | |
3756 | void setHasLoadedFieldsFromExternalStorage(bool val) const { |
3757 | RecordDeclBits.LoadedFieldsFromExternalStorage = val; |
3758 | } |
3759 | |
3760 | /// Functions to query basic properties of non-trivial C structs. |
3761 | bool isNonTrivialToPrimitiveDefaultInitialize() const { |
3762 | return RecordDeclBits.NonTrivialToPrimitiveDefaultInitialize; |
3763 | } |
3764 | |
3765 | void setNonTrivialToPrimitiveDefaultInitialize(bool V) { |
3766 | RecordDeclBits.NonTrivialToPrimitiveDefaultInitialize = V; |
3767 | } |
3768 | |
3769 | bool isNonTrivialToPrimitiveCopy() const { |
3770 | return RecordDeclBits.NonTrivialToPrimitiveCopy; |
3771 | } |
3772 | |
3773 | void setNonTrivialToPrimitiveCopy(bool V) { |
3774 | RecordDeclBits.NonTrivialToPrimitiveCopy = V; |
3775 | } |
3776 | |
3777 | bool isNonTrivialToPrimitiveDestroy() const { |
3778 | return RecordDeclBits.NonTrivialToPrimitiveDestroy; |
3779 | } |
3780 | |
3781 | void setNonTrivialToPrimitiveDestroy(bool V) { |
3782 | RecordDeclBits.NonTrivialToPrimitiveDestroy = V; |
3783 | } |
3784 | |
3785 | bool hasNonTrivialToPrimitiveDefaultInitializeCUnion() const { |
3786 | return RecordDeclBits.HasNonTrivialToPrimitiveDefaultInitializeCUnion; |
3787 | } |
3788 | |
3789 | void setHasNonTrivialToPrimitiveDefaultInitializeCUnion(bool V) { |
3790 | RecordDeclBits.HasNonTrivialToPrimitiveDefaultInitializeCUnion = V; |
3791 | } |
3792 | |
3793 | bool hasNonTrivialToPrimitiveDestructCUnion() const { |
3794 | return RecordDeclBits.HasNonTrivialToPrimitiveDestructCUnion; |
3795 | } |
3796 | |
3797 | void setHasNonTrivialToPrimitiveDestructCUnion(bool V) { |
3798 | RecordDeclBits.HasNonTrivialToPrimitiveDestructCUnion = V; |
3799 | } |
3800 | |
3801 | bool hasNonTrivialToPrimitiveCopyCUnion() const { |
3802 | return RecordDeclBits.HasNonTrivialToPrimitiveCopyCUnion; |
3803 | } |
3804 | |
3805 | void setHasNonTrivialToPrimitiveCopyCUnion(bool V) { |
3806 | RecordDeclBits.HasNonTrivialToPrimitiveCopyCUnion = V; |
3807 | } |
3808 | |
3809 | /// Determine whether this class can be passed in registers. In C++ mode, |
3810 | /// it must have at least one trivial, non-deleted copy or move constructor. |
3811 | /// FIXME: This should be set as part of completeDefinition. |
3812 | bool canPassInRegisters() const { |
3813 | return getArgPassingRestrictions() == APK_CanPassInRegs; |
3814 | } |
3815 | |
3816 | ArgPassingKind getArgPassingRestrictions() const { |
3817 | return static_cast<ArgPassingKind>(RecordDeclBits.ArgPassingRestrictions); |
3818 | } |
3819 | |
3820 | void setArgPassingRestrictions(ArgPassingKind Kind) { |
3821 | RecordDeclBits.ArgPassingRestrictions = Kind; |
3822 | } |
3823 | |
3824 | bool isParamDestroyedInCallee() const { |
3825 | return RecordDeclBits.ParamDestroyedInCallee; |
3826 | } |
3827 | |
3828 | void setParamDestroyedInCallee(bool V) { |
3829 | RecordDeclBits.ParamDestroyedInCallee = V; |
3830 | } |
3831 | |
3832 | /// Determines whether this declaration represents the |
3833 | /// injected class name. |
3834 | /// |
3835 | /// The injected class name in C++ is the name of the class that |
3836 | /// appears inside the class itself. For example: |
3837 | /// |
3838 | /// \code |
3839 | /// struct C { |
3840 | /// // C is implicitly declared here as a synonym for the class name. |
3841 | /// }; |
3842 | /// |
3843 | /// C::C c; // same as "C c;" |
3844 | /// \endcode |
3845 | bool isInjectedClassName() const; |
3846 | |
3847 | /// Determine whether this record is a class describing a lambda |
3848 | /// function object. |
3849 | bool isLambda() const; |
3850 | |
3851 | /// Determine whether this record is a record for captured variables in |
3852 | /// CapturedStmt construct. |
3853 | bool isCapturedRecord() const; |
3854 | |
3855 | /// Mark the record as a record for captured variables in CapturedStmt |
3856 | /// construct. |
3857 | void setCapturedRecord(); |
3858 | |
3859 | /// Returns the RecordDecl that actually defines |
3860 | /// this struct/union/class. When determining whether or not a |
3861 | /// struct/union/class is completely defined, one should use this |
3862 | /// method as opposed to 'isCompleteDefinition'. |
3863 | /// 'isCompleteDefinition' indicates whether or not a specific |
3864 | /// RecordDecl is a completed definition, not whether or not the |
3865 | /// record type is defined. This method returns NULL if there is |
3866 | /// no RecordDecl that defines the struct/union/tag. |
3867 | RecordDecl *getDefinition() const { |
3868 | return cast_or_null<RecordDecl>(TagDecl::getDefinition()); |
3869 | } |
3870 | |
3871 | // Iterator access to field members. The field iterator only visits |
3872 | // the non-static data members of this class, ignoring any static |
3873 | // data members, functions, constructors, destructors, etc. |
3874 | using field_iterator = specific_decl_iterator<FieldDecl>; |
3875 | using field_range = llvm::iterator_range<specific_decl_iterator<FieldDecl>>; |
3876 | |
3877 | field_range fields() const { return field_range(field_begin(), field_end()); } |
3878 | field_iterator field_begin() const; |
3879 | |
3880 | field_iterator field_end() const { |
3881 | return field_iterator(decl_iterator()); |
3882 | } |
3883 | |
3884 | // Whether there are any fields (non-static data members) in this record. |
3885 | bool field_empty() const { |
3886 | return field_begin() == field_end(); |
3887 | } |
3888 | |
3889 | /// Note that the definition of this type is now complete. |
3890 | virtual void completeDefinition(); |
3891 | |
3892 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3893 | static bool classofKind(Kind K) { |
3894 | return K >= firstRecord && K <= lastRecord; |
3895 | } |
3896 | |
3897 | /// Get whether or not this is an ms_struct which can |
3898 | /// be turned on with an attribute, pragma, or -mms-bitfields |
3899 | /// commandline option. |
3900 | bool isMsStruct(const ASTContext &C) const; |
3901 | |
3902 | /// Whether we are allowed to insert extra padding between fields. |
3903 | /// These padding are added to help AddressSanitizer detect |
3904 | /// intra-object-overflow bugs. |
3905 | bool mayInsertExtraPadding(bool EmitRemark = false) const; |
3906 | |
3907 | /// Finds the first data member which has a name. |
3908 | /// nullptr is returned if no named data member exists. |
3909 | const FieldDecl *findFirstNamedDataMember() const; |
3910 | |
3911 | private: |
3912 | /// Deserialize just the fields. |
3913 | void LoadFieldsFromExternalStorage() const; |
3914 | }; |
3915 | |
3916 | class FileScopeAsmDecl : public Decl { |
3917 | StringLiteral *AsmString; |
3918 | SourceLocation RParenLoc; |
3919 | |
3920 | FileScopeAsmDecl(DeclContext *DC, StringLiteral *asmstring, |
3921 | SourceLocation StartL, SourceLocation EndL) |
3922 | : Decl(FileScopeAsm, DC, StartL), AsmString(asmstring), RParenLoc(EndL) {} |
3923 | |
3924 | virtual void anchor(); |
3925 | |
3926 | public: |
3927 | static FileScopeAsmDecl *Create(ASTContext &C, DeclContext *DC, |
3928 | StringLiteral *Str, SourceLocation AsmLoc, |
3929 | SourceLocation RParenLoc); |
3930 | |
3931 | static FileScopeAsmDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3932 | |
3933 | SourceLocation getAsmLoc() const { return getLocation(); } |
3934 | SourceLocation getRParenLoc() const { return RParenLoc; } |
3935 | void setRParenLoc(SourceLocation L) { RParenLoc = L; } |
3936 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
3937 | return SourceRange(getAsmLoc(), getRParenLoc()); |
3938 | } |
3939 | |
3940 | const StringLiteral *getAsmString() const { return AsmString; } |
3941 | StringLiteral *getAsmString() { return AsmString; } |
3942 | void setAsmString(StringLiteral *Asm) { AsmString = Asm; } |
3943 | |
3944 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3945 | static bool classofKind(Kind K) { return K == FileScopeAsm; } |
3946 | }; |
3947 | |
3948 | /// Represents a block literal declaration, which is like an |
3949 | /// unnamed FunctionDecl. For example: |
3950 | /// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } |
3951 | class BlockDecl : public Decl, public DeclContext { |
3952 | // This class stores some data in DeclContext::BlockDeclBits |
3953 | // to save some space. Use the provided accessors to access it. |
3954 | public: |
3955 | /// A class which contains all the information about a particular |
3956 | /// captured value. |
3957 | class Capture { |
3958 | enum { |
3959 | flag_isByRef = 0x1, |
3960 | flag_isNested = 0x2 |
3961 | }; |
3962 | |
3963 | /// The variable being captured. |
3964 | llvm::PointerIntPair<VarDecl*, 2> VariableAndFlags; |
3965 | |
3966 | /// The copy expression, expressed in terms of a DeclRef (or |
3967 | /// BlockDeclRef) to the captured variable. Only required if the |
3968 | /// variable has a C++ class type. |
3969 | Expr *CopyExpr; |
3970 | |
3971 | public: |
3972 | Capture(VarDecl *variable, bool byRef, bool nested, Expr *copy) |
3973 | : VariableAndFlags(variable, |
3974 | (byRef ? flag_isByRef : 0) | (nested ? flag_isNested : 0)), |
3975 | CopyExpr(copy) {} |
3976 | |
3977 | /// The variable being captured. |
3978 | VarDecl *getVariable() const { return VariableAndFlags.getPointer(); } |
3979 | |
3980 | /// Whether this is a "by ref" capture, i.e. a capture of a __block |
3981 | /// variable. |
3982 | bool isByRef() const { return VariableAndFlags.getInt() & flag_isByRef; } |
3983 | |
3984 | bool isEscapingByref() const { |
3985 | return getVariable()->isEscapingByref(); |
3986 | } |
3987 | |
3988 | bool isNonEscapingByref() const { |
3989 | return getVariable()->isNonEscapingByref(); |
3990 | } |
3991 | |
3992 | /// Whether this is a nested capture, i.e. the variable captured |
3993 | /// is not from outside the immediately enclosing function/block. |
3994 | bool isNested() const { return VariableAndFlags.getInt() & flag_isNested; } |
3995 | |
3996 | bool hasCopyExpr() const { return CopyExpr != nullptr; } |
3997 | Expr *getCopyExpr() const { return CopyExpr; } |
3998 | void setCopyExpr(Expr *e) { CopyExpr = e; } |
3999 | }; |
4000 | |
4001 | private: |
4002 | /// A new[]'d array of pointers to ParmVarDecls for the formal |
4003 | /// parameters of this function. This is null if a prototype or if there are |
4004 | /// no formals. |
4005 | ParmVarDecl **ParamInfo = nullptr; |
4006 | unsigned NumParams = 0; |
4007 | |
4008 | Stmt *Body = nullptr; |
4009 | TypeSourceInfo *SignatureAsWritten = nullptr; |
4010 | |
4011 | const Capture *Captures = nullptr; |
4012 | unsigned NumCaptures = 0; |
4013 | |
4014 | unsigned ManglingNumber = 0; |
4015 | Decl *ManglingContextDecl = nullptr; |
4016 | |
4017 | protected: |
4018 | BlockDecl(DeclContext *DC, SourceLocation CaretLoc); |
4019 | |
4020 | public: |
4021 | static BlockDecl *Create(ASTContext &C, DeclContext *DC, SourceLocation L); |
4022 | static BlockDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4023 | |
4024 | SourceLocation getCaretLocation() const { return getLocation(); } |
4025 | |
4026 | bool isVariadic() const { return BlockDeclBits.IsVariadic; } |
4027 | void setIsVariadic(bool value) { BlockDeclBits.IsVariadic = value; } |
4028 | |
4029 | CompoundStmt *getCompoundBody() const { return (CompoundStmt*) Body; } |
4030 | Stmt *getBody() const override { return (Stmt*) Body; } |
4031 | void setBody(CompoundStmt *B) { Body = (Stmt*) B; } |
4032 | |
4033 | void setSignatureAsWritten(TypeSourceInfo *Sig) { SignatureAsWritten = Sig; } |
4034 | TypeSourceInfo *getSignatureAsWritten() const { return SignatureAsWritten; } |
4035 | |
4036 | // ArrayRef access to formal parameters. |
4037 | ArrayRef<ParmVarDecl *> parameters() const { |
4038 | return {ParamInfo, getNumParams()}; |
4039 | } |
4040 | MutableArrayRef<ParmVarDecl *> parameters() { |
4041 | return {ParamInfo, getNumParams()}; |
4042 | } |
4043 | |
4044 | // Iterator access to formal parameters. |
4045 | using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator; |
4046 | using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator; |
4047 | |
4048 | bool param_empty() const { return parameters().empty(); } |
4049 | param_iterator param_begin() { return parameters().begin(); } |
4050 | param_iterator param_end() { return parameters().end(); } |
4051 | param_const_iterator param_begin() const { return parameters().begin(); } |
4052 | param_const_iterator param_end() const { return parameters().end(); } |
4053 | size_t param_size() const { return parameters().size(); } |
4054 | |
4055 | unsigned getNumParams() const { return NumParams; } |
4056 | |
4057 | const ParmVarDecl *getParamDecl(unsigned i) const { |
4058 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4058, __PRETTY_FUNCTION__)); |
4059 | return ParamInfo[i]; |
4060 | } |
4061 | ParmVarDecl *getParamDecl(unsigned i) { |
4062 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4062, __PRETTY_FUNCTION__)); |
4063 | return ParamInfo[i]; |
4064 | } |
4065 | |
4066 | void setParams(ArrayRef<ParmVarDecl *> NewParamInfo); |
4067 | |
4068 | /// True if this block (or its nested blocks) captures |
4069 | /// anything of local storage from its enclosing scopes. |
4070 | bool hasCaptures() const { return NumCaptures || capturesCXXThis(); } |
4071 | |
4072 | /// Returns the number of captured variables. |
4073 | /// Does not include an entry for 'this'. |
4074 | unsigned getNumCaptures() const { return NumCaptures; } |
4075 | |
4076 | using capture_const_iterator = ArrayRef<Capture>::const_iterator; |
4077 | |
4078 | ArrayRef<Capture> captures() const { return {Captures, NumCaptures}; } |
4079 | |
4080 | capture_const_iterator capture_begin() const { return captures().begin(); } |
4081 | capture_const_iterator capture_end() const { return captures().end(); } |
4082 | |
4083 | bool capturesCXXThis() const { return BlockDeclBits.CapturesCXXThis; } |
4084 | void setCapturesCXXThis(bool B = true) { BlockDeclBits.CapturesCXXThis = B; } |
4085 | |
4086 | bool blockMissingReturnType() const { |
4087 | return BlockDeclBits.BlockMissingReturnType; |
4088 | } |
4089 | |
4090 | void setBlockMissingReturnType(bool val = true) { |
4091 | BlockDeclBits.BlockMissingReturnType = val; |
4092 | } |
4093 | |
4094 | bool isConversionFromLambda() const { |
4095 | return BlockDeclBits.IsConversionFromLambda; |
4096 | } |
4097 | |
4098 | void setIsConversionFromLambda(bool val = true) { |
4099 | BlockDeclBits.IsConversionFromLambda = val; |
4100 | } |
4101 | |
4102 | bool doesNotEscape() const { return BlockDeclBits.DoesNotEscape; } |
4103 | void setDoesNotEscape(bool B = true) { BlockDeclBits.DoesNotEscape = B; } |
4104 | |
4105 | bool canAvoidCopyToHeap() const { |
4106 | return BlockDeclBits.CanAvoidCopyToHeap; |
4107 | } |
4108 | void setCanAvoidCopyToHeap(bool B = true) { |
4109 | BlockDeclBits.CanAvoidCopyToHeap = B; |
4110 | } |
4111 | |
4112 | bool capturesVariable(const VarDecl *var) const; |
4113 | |
4114 | void setCaptures(ASTContext &Context, ArrayRef<Capture> Captures, |
4115 | bool CapturesCXXThis); |
4116 | |
4117 | unsigned getBlockManglingNumber() const { |
4118 | return ManglingNumber; |
4119 | } |
4120 | |
4121 | Decl *getBlockManglingContextDecl() const { |
4122 | return ManglingContextDecl; |
4123 | } |
4124 | |
4125 | void setBlockMangling(unsigned Number, Decl *Ctx) { |
4126 | ManglingNumber = Number; |
4127 | ManglingContextDecl = Ctx; |
4128 | } |
4129 | |
4130 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
4131 | |
4132 | // Implement isa/cast/dyncast/etc. |
4133 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4134 | static bool classofKind(Kind K) { return K == Block; } |
4135 | static DeclContext *castToDeclContext(const BlockDecl *D) { |
4136 | return static_cast<DeclContext *>(const_cast<BlockDecl*>(D)); |
4137 | } |
4138 | static BlockDecl *castFromDeclContext(const DeclContext *DC) { |
4139 | return static_cast<BlockDecl *>(const_cast<DeclContext*>(DC)); |
4140 | } |
4141 | }; |
4142 | |
4143 | /// Represents the body of a CapturedStmt, and serves as its DeclContext. |
4144 | class CapturedDecl final |
4145 | : public Decl, |
4146 | public DeclContext, |
4147 | private llvm::TrailingObjects<CapturedDecl, ImplicitParamDecl *> { |
4148 | protected: |
4149 | size_t numTrailingObjects(OverloadToken<ImplicitParamDecl>) { |
4150 | return NumParams; |
4151 | } |
4152 | |
4153 | private: |
4154 | /// The number of parameters to the outlined function. |
4155 | unsigned NumParams; |
4156 | |
4157 | /// The position of context parameter in list of parameters. |
4158 | unsigned ContextParam; |
4159 | |
4160 | /// The body of the outlined function. |
4161 | llvm::PointerIntPair<Stmt *, 1, bool> BodyAndNothrow; |
4162 | |
4163 | explicit CapturedDecl(DeclContext *DC, unsigned NumParams); |
4164 | |
4165 | ImplicitParamDecl *const *getParams() const { |
4166 | return getTrailingObjects<ImplicitParamDecl *>(); |
4167 | } |
4168 | |
4169 | ImplicitParamDecl **getParams() { |
4170 | return getTrailingObjects<ImplicitParamDecl *>(); |
4171 | } |
4172 | |
4173 | public: |
4174 | friend class ASTDeclReader; |
4175 | friend class ASTDeclWriter; |
4176 | friend TrailingObjects; |
4177 | |
4178 | static CapturedDecl *Create(ASTContext &C, DeclContext *DC, |
4179 | unsigned NumParams); |
4180 | static CapturedDecl *CreateDeserialized(ASTContext &C, unsigned ID, |
4181 | unsigned NumParams); |
4182 | |
4183 | Stmt *getBody() const override; |
4184 | void setBody(Stmt *B); |
4185 | |
4186 | bool isNothrow() const; |
4187 | void setNothrow(bool Nothrow = true); |
4188 | |
4189 | unsigned getNumParams() const { return NumParams; } |
4190 | |
4191 | ImplicitParamDecl *getParam(unsigned i) const { |
4192 | assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail ("i < NumParams", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4192, __PRETTY_FUNCTION__)); |
4193 | return getParams()[i]; |
4194 | } |
4195 | void setParam(unsigned i, ImplicitParamDecl *P) { |
4196 | assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail ("i < NumParams", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4196, __PRETTY_FUNCTION__)); |
4197 | getParams()[i] = P; |
4198 | } |
4199 | |
4200 | // ArrayRef interface to parameters. |
4201 | ArrayRef<ImplicitParamDecl *> parameters() const { |
4202 | return {getParams(), getNumParams()}; |
4203 | } |
4204 | MutableArrayRef<ImplicitParamDecl *> parameters() { |
4205 | return {getParams(), getNumParams()}; |
4206 | } |
4207 | |
4208 | /// Retrieve the parameter containing captured variables. |
4209 | ImplicitParamDecl *getContextParam() const { |
4210 | assert(ContextParam < NumParams)((ContextParam < NumParams) ? static_cast<void> (0) : __assert_fail ("ContextParam < NumParams", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4210, __PRETTY_FUNCTION__)); |
4211 | return getParam(ContextParam); |
4212 | } |
4213 | void setContextParam(unsigned i, ImplicitParamDecl *P) { |
4214 | assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail ("i < NumParams", "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4214, __PRETTY_FUNCTION__)); |
4215 | ContextParam = i; |
4216 | setParam(i, P); |
4217 | } |
4218 | unsigned getContextParamPosition() const { return ContextParam; } |
4219 | |
4220 | using param_iterator = ImplicitParamDecl *const *; |
4221 | using param_range = llvm::iterator_range<param_iterator>; |
4222 | |
4223 | /// Retrieve an iterator pointing to the first parameter decl. |
4224 | param_iterator param_begin() const { return getParams(); } |
4225 | /// Retrieve an iterator one past the last parameter decl. |
4226 | param_iterator param_end() const { return getParams() + NumParams; } |
4227 | |
4228 | // Implement isa/cast/dyncast/etc. |
4229 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4230 | static bool classofKind(Kind K) { return K == Captured; } |
4231 | static DeclContext *castToDeclContext(const CapturedDecl *D) { |
4232 | return static_cast<DeclContext *>(const_cast<CapturedDecl *>(D)); |
4233 | } |
4234 | static CapturedDecl *castFromDeclContext(const DeclContext *DC) { |
4235 | return static_cast<CapturedDecl *>(const_cast<DeclContext *>(DC)); |
4236 | } |
4237 | }; |
4238 | |
4239 | /// Describes a module import declaration, which makes the contents |
4240 | /// of the named module visible in the current translation unit. |
4241 | /// |
4242 | /// An import declaration imports the named module (or submodule). For example: |
4243 | /// \code |
4244 | /// @import std.vector; |
4245 | /// \endcode |
4246 | /// |
4247 | /// Import declarations can also be implicitly generated from |
4248 | /// \#include/\#import directives. |
4249 | class ImportDecl final : public Decl, |
4250 | llvm::TrailingObjects<ImportDecl, SourceLocation> { |
4251 | friend class ASTContext; |
4252 | friend class ASTDeclReader; |
4253 | friend class ASTReader; |
4254 | friend TrailingObjects; |
4255 | |
4256 | /// The imported module, along with a bit that indicates whether |
4257 | /// we have source-location information for each identifier in the module |
4258 | /// name. |
4259 | /// |
4260 | /// When the bit is false, we only have a single source location for the |
4261 | /// end of the import declaration. |
4262 | llvm::PointerIntPair<Module *, 1, bool> ImportedAndComplete; |
4263 | |
4264 | /// The next import in the list of imports local to the translation |
4265 | /// unit being parsed (not loaded from an AST file). |
4266 | ImportDecl *NextLocalImport = nullptr; |
4267 | |
4268 | ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported, |
4269 | ArrayRef<SourceLocation> IdentifierLocs); |
4270 | |
4271 | ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported, |
4272 | SourceLocation EndLoc); |
4273 | |
4274 | ImportDecl(EmptyShell Empty) : Decl(Import, Empty) {} |
4275 | |
4276 | public: |
4277 | /// Create a new module import declaration. |
4278 | static ImportDecl *Create(ASTContext &C, DeclContext *DC, |
4279 | SourceLocation StartLoc, Module *Imported, |
4280 | ArrayRef<SourceLocation> IdentifierLocs); |
4281 | |
4282 | /// Create a new module import declaration for an implicitly-generated |
4283 | /// import. |
4284 | static ImportDecl *CreateImplicit(ASTContext &C, DeclContext *DC, |
4285 | SourceLocation StartLoc, Module *Imported, |
4286 | SourceLocation EndLoc); |
4287 | |
4288 | /// Create a new, deserialized module import declaration. |
4289 | static ImportDecl *CreateDeserialized(ASTContext &C, unsigned ID, |
4290 | unsigned NumLocations); |
4291 | |
4292 | /// Retrieve the module that was imported by the import declaration. |
4293 | Module *getImportedModule() const { return ImportedAndComplete.getPointer(); } |
4294 | |
4295 | /// Retrieves the locations of each of the identifiers that make up |
4296 | /// the complete module name in the import declaration. |
4297 | /// |
4298 | /// This will return an empty array if the locations of the individual |
4299 | /// identifiers aren't available. |
4300 | ArrayRef<SourceLocation> getIdentifierLocs() const; |
4301 | |
4302 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
4303 | |
4304 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4305 | static bool classofKind(Kind K) { return K == Import; } |
4306 | }; |
4307 | |
4308 | /// Represents a C++ Modules TS module export declaration. |
4309 | /// |
4310 | /// For example: |
4311 | /// \code |
4312 | /// export void foo(); |
4313 | /// \endcode |
4314 | class ExportDecl final : public Decl, public DeclContext { |
4315 | virtual void anchor(); |
4316 | |
4317 | private: |
4318 | friend class ASTDeclReader; |
4319 | |
4320 | /// The source location for the right brace (if valid). |
4321 | SourceLocation RBraceLoc; |
4322 | |
4323 | ExportDecl(DeclContext *DC, SourceLocation ExportLoc) |
4324 | : Decl(Export, DC, ExportLoc), DeclContext(Export), |
4325 | RBraceLoc(SourceLocation()) {} |
4326 | |
4327 | public: |
4328 | static ExportDecl *Create(ASTContext &C, DeclContext *DC, |
4329 | SourceLocation ExportLoc); |
4330 | static ExportDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4331 | |
4332 | SourceLocation getExportLoc() const { return getLocation(); } |
4333 | SourceLocation getRBraceLoc() const { return RBraceLoc; } |
4334 | void setRBraceLoc(SourceLocation L) { RBraceLoc = L; } |
4335 | |
4336 | bool hasBraces() const { return RBraceLoc.isValid(); } |
4337 | |
4338 | SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { |
4339 | if (hasBraces()) |
4340 | return RBraceLoc; |
4341 | // No braces: get the end location of the (only) declaration in context |
4342 | // (if present). |
4343 | return decls_empty() ? getLocation() : decls_begin()->getEndLoc(); |
4344 | } |
4345 | |
4346 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
4347 | return SourceRange(getLocation(), getEndLoc()); |
4348 | } |
4349 | |
4350 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4351 | static bool classofKind(Kind K) { return K == Export; } |
4352 | static DeclContext *castToDeclContext(const ExportDecl *D) { |
4353 | return static_cast<DeclContext *>(const_cast<ExportDecl*>(D)); |
4354 | } |
4355 | static ExportDecl *castFromDeclContext(const DeclContext *DC) { |
4356 | return static_cast<ExportDecl *>(const_cast<DeclContext*>(DC)); |
4357 | } |
4358 | }; |
4359 | |
4360 | /// Represents an empty-declaration. |
4361 | class EmptyDecl : public Decl { |
4362 | EmptyDecl(DeclContext *DC, SourceLocation L) : Decl(Empty, DC, L) {} |
4363 | |
4364 | virtual void anchor(); |
4365 | |
4366 | public: |
4367 | static EmptyDecl *Create(ASTContext &C, DeclContext *DC, |
4368 | SourceLocation L); |
4369 | static EmptyDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4370 | |
4371 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4372 | static bool classofKind(Kind K) { return K == Empty; } |
4373 | }; |
4374 | |
4375 | /// Insertion operator for diagnostics. This allows sending NamedDecl's |
4376 | /// into a diagnostic with <<. |
4377 | inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB, |
4378 | const NamedDecl* ND) { |
4379 | DB.AddTaggedVal(reinterpret_cast<intptr_t>(ND), |
4380 | DiagnosticsEngine::ak_nameddecl); |
4381 | return DB; |
4382 | } |
4383 | inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD, |
4384 | const NamedDecl* ND) { |
4385 | PD.AddTaggedVal(reinterpret_cast<intptr_t>(ND), |
4386 | DiagnosticsEngine::ak_nameddecl); |
4387 | return PD; |
4388 | } |
4389 | |
4390 | template<typename decl_type> |
4391 | void Redeclarable<decl_type>::setPreviousDecl(decl_type *PrevDecl) { |
4392 | // Note: This routine is implemented here because we need both NamedDecl |
4393 | // and Redeclarable to be defined. |
4394 | assert(RedeclLink.isFirst() &&((RedeclLink.isFirst() && "setPreviousDecl on a decl already in a redeclaration chain" ) ? static_cast<void> (0) : __assert_fail ("RedeclLink.isFirst() && \"setPreviousDecl on a decl already in a redeclaration chain\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4395, __PRETTY_FUNCTION__)) |
4395 | "setPreviousDecl on a decl already in a redeclaration chain")((RedeclLink.isFirst() && "setPreviousDecl on a decl already in a redeclaration chain" ) ? static_cast<void> (0) : __assert_fail ("RedeclLink.isFirst() && \"setPreviousDecl on a decl already in a redeclaration chain\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4395, __PRETTY_FUNCTION__)); |
4396 | |
4397 | if (PrevDecl) { |
4398 | // Point to previous. Make sure that this is actually the most recent |
4399 | // redeclaration, or we can build invalid chains. If the most recent |
4400 | // redeclaration is invalid, it won't be PrevDecl, but we want it anyway. |
4401 | First = PrevDecl->getFirstDecl(); |
4402 | assert(First->RedeclLink.isFirst() && "Expected first")((First->RedeclLink.isFirst() && "Expected first") ? static_cast<void> (0) : __assert_fail ("First->RedeclLink.isFirst() && \"Expected first\"" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4402, __PRETTY_FUNCTION__)); |
4403 | decl_type *MostRecent = First->getNextRedeclaration(); |
4404 | RedeclLink = PreviousDeclLink(cast<decl_type>(MostRecent)); |
4405 | |
4406 | // If the declaration was previously visible, a redeclaration of it remains |
4407 | // visible even if it wouldn't be visible by itself. |
4408 | static_cast<decl_type*>(this)->IdentifierNamespace |= |
4409 | MostRecent->getIdentifierNamespace() & |
4410 | (Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Type); |
4411 | } else { |
4412 | // Make this first. |
4413 | First = static_cast<decl_type*>(this); |
4414 | } |
4415 | |
4416 | // First one will point to this one as latest. |
4417 | First->RedeclLink.setLatest(static_cast<decl_type*>(this)); |
4418 | |
4419 | assert(!isa<NamedDecl>(static_cast<decl_type*>(this)) ||((!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))-> isLinkageValid()) ? static_cast<void> (0) : __assert_fail ("!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4420, __PRETTY_FUNCTION__)) |
4420 | cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid())((!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))-> isLinkageValid()) ? static_cast<void> (0) : __assert_fail ("!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid()" , "/build/llvm-toolchain-snapshot-10~svn373253/tools/clang/include/clang/AST/Decl.h" , 4420, __PRETTY_FUNCTION__)); |
4421 | } |
4422 | |
4423 | // Inline function definitions. |
4424 | |
4425 | /// Check if the given decl is complete. |
4426 | /// |
4427 | /// We use this function to break a cycle between the inline definitions in |
4428 | /// Type.h and Decl.h. |
4429 | inline bool IsEnumDeclComplete(EnumDecl *ED) { |
4430 | return ED->isComplete(); |
4431 | } |
4432 | |
4433 | /// Check if the given decl is scoped. |
4434 | /// |
4435 | /// We use this function to break a cycle between the inline definitions in |
4436 | /// Type.h and Decl.h. |
4437 | inline bool IsEnumDeclScoped(EnumDecl *ED) { |
4438 | return ED->isScoped(); |
4439 | } |
4440 | |
4441 | } // namespace clang |
4442 | |
4443 | #endif // LLVM_CLANG_AST_DECL_H |
1 | //===- llvm/ADT/SmallVector.h - 'Normally small' vectors --------*- C++ -*-===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file defines the SmallVector class. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #ifndef LLVM_ADT_SMALLVECTOR_H |
14 | #define LLVM_ADT_SMALLVECTOR_H |
15 | |
16 | #include "llvm/ADT/iterator_range.h" |
17 | #include "llvm/Support/AlignOf.h" |
18 | #include "llvm/Support/Compiler.h" |
19 | #include "llvm/Support/MathExtras.h" |
20 | #include "llvm/Support/MemAlloc.h" |
21 | #include "llvm/Support/type_traits.h" |
22 | #include "llvm/Support/ErrorHandling.h" |
23 | #include <algorithm> |
24 | #include <cassert> |
25 | #include <cstddef> |
26 | #include <cstdlib> |
27 | #include <cstring> |
28 | #include <initializer_list> |
29 | #include <iterator> |
30 | #include <memory> |
31 | #include <new> |
32 | #include <type_traits> |
33 | #include <utility> |
34 | |
35 | namespace llvm { |
36 | |
37 | /// This is all the non-templated stuff common to all SmallVectors. |
38 | class SmallVectorBase { |
39 | protected: |
40 | void *BeginX; |
41 | unsigned Size = 0, Capacity; |
42 | |
43 | SmallVectorBase() = delete; |
44 | SmallVectorBase(void *FirstEl, size_t TotalCapacity) |
45 | : BeginX(FirstEl), Capacity(TotalCapacity) {} |
46 | |
47 | /// This is an implementation of the grow() method which only works |
48 | /// on POD-like data types and is out of line to reduce code duplication. |
49 | void grow_pod(void *FirstEl, size_t MinCapacity, size_t TSize); |
50 | |
51 | public: |
52 | size_t size() const { return Size; } |
53 | size_t capacity() const { return Capacity; } |
54 | |
55 | LLVM_NODISCARD[[clang::warn_unused_result]] bool empty() const { return !Size; } |
56 | |
57 | /// Set the array size to \p N, which the current array must have enough |
58 | /// capacity for. |
59 | /// |
60 | /// This does not construct or destroy any elements in the vector. |
61 | /// |
62 | /// Clients can use this in conjunction with capacity() to write past the end |
63 | /// of the buffer when they know that more elements are available, and only |
64 | /// update the size later. This avoids the cost of value initializing elements |
65 | /// which will only be overwritten. |
66 | void set_size(size_t N) { |
67 | assert(N <= capacity())((N <= capacity()) ? static_cast<void> (0) : __assert_fail ("N <= capacity()", "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 67, __PRETTY_FUNCTION__)); |
68 | Size = N; |
69 | } |
70 | }; |
71 | |
72 | /// Figure out the offset of the first element. |
73 | template <class T, typename = void> struct SmallVectorAlignmentAndSize { |
74 | AlignedCharArrayUnion<SmallVectorBase> Base; |
75 | AlignedCharArrayUnion<T> FirstEl; |
76 | }; |
77 | |
78 | /// This is the part of SmallVectorTemplateBase which does not depend on whether |
79 | /// the type T is a POD. The extra dummy template argument is used by ArrayRef |
80 | /// to avoid unnecessarily requiring T to be complete. |
81 | template <typename T, typename = void> |
82 | class SmallVectorTemplateCommon : public SmallVectorBase { |
83 | /// Find the address of the first element. For this pointer math to be valid |
84 | /// with small-size of 0 for T with lots of alignment, it's important that |
85 | /// SmallVectorStorage is properly-aligned even for small-size of 0. |
86 | void *getFirstEl() const { |
87 | return const_cast<void *>(reinterpret_cast<const void *>( |
88 | reinterpret_cast<const char *>(this) + |
89 | offsetof(SmallVectorAlignmentAndSize<T>, FirstEl)__builtin_offsetof(SmallVectorAlignmentAndSize<T>, FirstEl ))); |
90 | } |
91 | // Space after 'FirstEl' is clobbered, do not add any instance vars after it. |
92 | |
93 | protected: |
94 | SmallVectorTemplateCommon(size_t Size) |
95 | : SmallVectorBase(getFirstEl(), Size) {} |
96 | |
97 | void grow_pod(size_t MinCapacity, size_t TSize) { |
98 | SmallVectorBase::grow_pod(getFirstEl(), MinCapacity, TSize); |
99 | } |
100 | |
101 | /// Return true if this is a smallvector which has not had dynamic |
102 | /// memory allocated for it. |
103 | bool isSmall() const { return BeginX == getFirstEl(); } |
104 | |
105 | /// Put this vector in a state of being small. |
106 | void resetToSmall() { |
107 | BeginX = getFirstEl(); |
108 | Size = Capacity = 0; // FIXME: Setting Capacity to 0 is suspect. |
109 | } |
110 | |
111 | public: |
112 | using size_type = size_t; |
113 | using difference_type = ptrdiff_t; |
114 | using value_type = T; |
115 | using iterator = T *; |
116 | using const_iterator = const T *; |
117 | |
118 | using const_reverse_iterator = std::reverse_iterator<const_iterator>; |
119 | using reverse_iterator = std::reverse_iterator<iterator>; |
120 | |
121 | using reference = T &; |
122 | using const_reference = const T &; |
123 | using pointer = T *; |
124 | using const_pointer = const T *; |
125 | |
126 | // forward iterator creation methods. |
127 | iterator begin() { return (iterator)this->BeginX; } |
128 | const_iterator begin() const { return (const_iterator)this->BeginX; } |
129 | iterator end() { return begin() + size(); } |
130 | const_iterator end() const { return begin() + size(); } |
131 | |
132 | // reverse iterator creation methods. |
133 | reverse_iterator rbegin() { return reverse_iterator(end()); } |
134 | const_reverse_iterator rbegin() const{ return const_reverse_iterator(end()); } |
135 | reverse_iterator rend() { return reverse_iterator(begin()); } |
136 | const_reverse_iterator rend() const { return const_reverse_iterator(begin());} |
137 | |
138 | size_type size_in_bytes() const { return size() * sizeof(T); } |
139 | size_type max_size() const { return size_type(-1) / sizeof(T); } |
140 | |
141 | size_t capacity_in_bytes() const { return capacity() * sizeof(T); } |
142 | |
143 | /// Return a pointer to the vector's buffer, even if empty(). |
144 | pointer data() { return pointer(begin()); } |
145 | /// Return a pointer to the vector's buffer, even if empty(). |
146 | const_pointer data() const { return const_pointer(begin()); } |
147 | |
148 | reference operator[](size_type idx) { |
149 | assert(idx < size())((idx < size()) ? static_cast<void> (0) : __assert_fail ("idx < size()", "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 149, __PRETTY_FUNCTION__)); |
150 | return begin()[idx]; |
151 | } |
152 | const_reference operator[](size_type idx) const { |
153 | assert(idx < size())((idx < size()) ? static_cast<void> (0) : __assert_fail ("idx < size()", "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 153, __PRETTY_FUNCTION__)); |
154 | return begin()[idx]; |
155 | } |
156 | |
157 | reference front() { |
158 | assert(!empty())((!empty()) ? static_cast<void> (0) : __assert_fail ("!empty()" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 158, __PRETTY_FUNCTION__)); |
159 | return begin()[0]; |
160 | } |
161 | const_reference front() const { |
162 | assert(!empty())((!empty()) ? static_cast<void> (0) : __assert_fail ("!empty()" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 162, __PRETTY_FUNCTION__)); |
163 | return begin()[0]; |
164 | } |
165 | |
166 | reference back() { |
167 | assert(!empty())((!empty()) ? static_cast<void> (0) : __assert_fail ("!empty()" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 167, __PRETTY_FUNCTION__)); |
168 | return end()[-1]; |
169 | } |
170 | const_reference back() const { |
171 | assert(!empty())((!empty()) ? static_cast<void> (0) : __assert_fail ("!empty()" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 171, __PRETTY_FUNCTION__)); |
172 | return end()[-1]; |
173 | } |
174 | }; |
175 | |
176 | /// SmallVectorTemplateBase<TriviallyCopyable = false> - This is where we put method |
177 | /// implementations that are designed to work with non-POD-like T's. |
178 | template <typename T, bool = is_trivially_copyable<T>::value> |
179 | class SmallVectorTemplateBase : public SmallVectorTemplateCommon<T> { |
180 | protected: |
181 | SmallVectorTemplateBase(size_t Size) : SmallVectorTemplateCommon<T>(Size) {} |
182 | |
183 | static void destroy_range(T *S, T *E) { |
184 | while (S != E) { |
185 | --E; |
186 | E->~T(); |
187 | } |
188 | } |
189 | |
190 | /// Move the range [I, E) into the uninitialized memory starting with "Dest", |
191 | /// constructing elements as needed. |
192 | template<typename It1, typename It2> |
193 | static void uninitialized_move(It1 I, It1 E, It2 Dest) { |
194 | std::uninitialized_copy(std::make_move_iterator(I), |
195 | std::make_move_iterator(E), Dest); |
196 | } |
197 | |
198 | /// Copy the range [I, E) onto the uninitialized memory starting with "Dest", |
199 | /// constructing elements as needed. |
200 | template<typename It1, typename It2> |
201 | static void uninitialized_copy(It1 I, It1 E, It2 Dest) { |
202 | std::uninitialized_copy(I, E, Dest); |
203 | } |
204 | |
205 | /// Grow the allocated memory (without initializing new elements), doubling |
206 | /// the size of the allocated memory. Guarantees space for at least one more |
207 | /// element, or MinSize more elements if specified. |
208 | void grow(size_t MinSize = 0); |
209 | |
210 | public: |
211 | void push_back(const T &Elt) { |
212 | if (LLVM_UNLIKELY(this->size() >= this->capacity())__builtin_expect((bool)(this->size() >= this->capacity ()), false)) |
213 | this->grow(); |
214 | ::new ((void*) this->end()) T(Elt); |
215 | this->set_size(this->size() + 1); |
216 | } |
217 | |
218 | void push_back(T &&Elt) { |
219 | if (LLVM_UNLIKELY(this->size() >= this->capacity())__builtin_expect((bool)(this->size() >= this->capacity ()), false)) |
220 | this->grow(); |
221 | ::new ((void*) this->end()) T(::std::move(Elt)); |
222 | this->set_size(this->size() + 1); |
223 | } |
224 | |
225 | void pop_back() { |
226 | this->set_size(this->size() - 1); |
227 | this->end()->~T(); |
228 | } |
229 | }; |
230 | |
231 | // Define this out-of-line to dissuade the C++ compiler from inlining it. |
232 | template <typename T, bool TriviallyCopyable> |
233 | void SmallVectorTemplateBase<T, TriviallyCopyable>::grow(size_t MinSize) { |
234 | if (MinSize > UINT32_MAX(4294967295U)) |
235 | report_bad_alloc_error("SmallVector capacity overflow during allocation"); |
236 | |
237 | // Always grow, even from zero. |
238 | size_t NewCapacity = size_t(NextPowerOf2(this->capacity() + 2)); |
239 | NewCapacity = std::min(std::max(NewCapacity, MinSize), size_t(UINT32_MAX(4294967295U))); |
240 | T *NewElts = static_cast<T*>(llvm::safe_malloc(NewCapacity*sizeof(T))); |
241 | |
242 | // Move the elements over. |
243 | this->uninitialized_move(this->begin(), this->end(), NewElts); |
244 | |
245 | // Destroy the original elements. |
246 | destroy_range(this->begin(), this->end()); |
247 | |
248 | // If this wasn't grown from the inline copy, deallocate the old space. |
249 | if (!this->isSmall()) |
250 | free(this->begin()); |
251 | |
252 | this->BeginX = NewElts; |
253 | this->Capacity = NewCapacity; |
254 | } |
255 | |
256 | /// SmallVectorTemplateBase<TriviallyCopyable = true> - This is where we put |
257 | /// method implementations that are designed to work with POD-like T's. |
258 | template <typename T> |
259 | class SmallVectorTemplateBase<T, true> : public SmallVectorTemplateCommon<T> { |
260 | protected: |
261 | SmallVectorTemplateBase(size_t Size) : SmallVectorTemplateCommon<T>(Size) {} |
262 | |
263 | // No need to do a destroy loop for POD's. |
264 | static void destroy_range(T *, T *) {} |
265 | |
266 | /// Move the range [I, E) onto the uninitialized memory |
267 | /// starting with "Dest", constructing elements into it as needed. |
268 | template<typename It1, typename It2> |
269 | static void uninitialized_move(It1 I, It1 E, It2 Dest) { |
270 | // Just do a copy. |
271 | uninitialized_copy(I, E, Dest); |
272 | } |
273 | |
274 | /// Copy the range [I, E) onto the uninitialized memory |
275 | /// starting with "Dest", constructing elements into it as needed. |
276 | template<typename It1, typename It2> |
277 | static void uninitialized_copy(It1 I, It1 E, It2 Dest) { |
278 | // Arbitrary iterator types; just use the basic implementation. |
279 | std::uninitialized_copy(I, E, Dest); |
280 | } |
281 | |
282 | /// Copy the range [I, E) onto the uninitialized memory |
283 | /// starting with "Dest", constructing elements into it as needed. |
284 | template <typename T1, typename T2> |
285 | static void uninitialized_copy( |
286 | T1 *I, T1 *E, T2 *Dest, |
287 | typename std::enable_if<std::is_same<typename std::remove_const<T1>::type, |
288 | T2>::value>::type * = nullptr) { |
289 | // Use memcpy for PODs iterated by pointers (which includes SmallVector |
290 | // iterators): std::uninitialized_copy optimizes to memmove, but we can |
291 | // use memcpy here. Note that I and E are iterators and thus might be |
292 | // invalid for memcpy if they are equal. |
293 | if (I != E) |
294 | memcpy(reinterpret_cast<void *>(Dest), I, (E - I) * sizeof(T)); |
295 | } |
296 | |
297 | /// Double the size of the allocated memory, guaranteeing space for at |
298 | /// least one more element or MinSize if specified. |
299 | void grow(size_t MinSize = 0) { this->grow_pod(MinSize, sizeof(T)); } |
300 | |
301 | public: |
302 | void push_back(const T &Elt) { |
303 | if (LLVM_UNLIKELY(this->size() >= this->capacity())__builtin_expect((bool)(this->size() >= this->capacity ()), false)) |
304 | this->grow(); |
305 | memcpy(reinterpret_cast<void *>(this->end()), &Elt, sizeof(T)); |
306 | this->set_size(this->size() + 1); |
307 | } |
308 | |
309 | void pop_back() { this->set_size(this->size() - 1); } |
310 | }; |
311 | |
312 | /// This class consists of common code factored out of the SmallVector class to |
313 | /// reduce code duplication based on the SmallVector 'N' template parameter. |
314 | template <typename T> |
315 | class SmallVectorImpl : public SmallVectorTemplateBase<T> { |
316 | using SuperClass = SmallVectorTemplateBase<T>; |
317 | |
318 | public: |
319 | using iterator = typename SuperClass::iterator; |
320 | using const_iterator = typename SuperClass::const_iterator; |
321 | using reference = typename SuperClass::reference; |
322 | using size_type = typename SuperClass::size_type; |
323 | |
324 | protected: |
325 | // Default ctor - Initialize to empty. |
326 | explicit SmallVectorImpl(unsigned N) |
327 | : SmallVectorTemplateBase<T>(N) {} |
328 | |
329 | public: |
330 | SmallVectorImpl(const SmallVectorImpl &) = delete; |
331 | |
332 | ~SmallVectorImpl() { |
333 | // Subclass has already destructed this vector's elements. |
334 | // If this wasn't grown from the inline copy, deallocate the old space. |
335 | if (!this->isSmall()) |
336 | free(this->begin()); |
337 | } |
338 | |
339 | void clear() { |
340 | this->destroy_range(this->begin(), this->end()); |
341 | this->Size = 0; |
342 | } |
343 | |
344 | void resize(size_type N) { |
345 | if (N < this->size()) { |
346 | this->destroy_range(this->begin()+N, this->end()); |
347 | this->set_size(N); |
348 | } else if (N > this->size()) { |
349 | if (this->capacity() < N) |
350 | this->grow(N); |
351 | for (auto I = this->end(), E = this->begin() + N; I != E; ++I) |
352 | new (&*I) T(); |
353 | this->set_size(N); |
354 | } |
355 | } |
356 | |
357 | void resize(size_type N, const T &NV) { |
358 | if (N < this->size()) { |
359 | this->destroy_range(this->begin()+N, this->end()); |
360 | this->set_size(N); |
361 | } else if (N > this->size()) { |
362 | if (this->capacity() < N) |
363 | this->grow(N); |
364 | std::uninitialized_fill(this->end(), this->begin()+N, NV); |
365 | this->set_size(N); |
366 | } |
367 | } |
368 | |
369 | void reserve(size_type N) { |
370 | if (this->capacity() < N) |
371 | this->grow(N); |
372 | } |
373 | |
374 | LLVM_NODISCARD[[clang::warn_unused_result]] T pop_back_val() { |
375 | T Result = ::std::move(this->back()); |
376 | this->pop_back(); |
377 | return Result; |
378 | } |
379 | |
380 | void swap(SmallVectorImpl &RHS); |
381 | |
382 | /// Add the specified range to the end of the SmallVector. |
383 | template <typename in_iter, |
384 | typename = typename std::enable_if<std::is_convertible< |
385 | typename std::iterator_traits<in_iter>::iterator_category, |
386 | std::input_iterator_tag>::value>::type> |
387 | void append(in_iter in_start, in_iter in_end) { |
388 | size_type NumInputs = std::distance(in_start, in_end); |
389 | if (NumInputs > this->capacity() - this->size()) |
390 | this->grow(this->size()+NumInputs); |
391 | |
392 | this->uninitialized_copy(in_start, in_end, this->end()); |
393 | this->set_size(this->size() + NumInputs); |
394 | } |
395 | |
396 | /// Append \p NumInputs copies of \p Elt to the end. |
397 | void append(size_type NumInputs, const T &Elt) { |
398 | if (NumInputs > this->capacity() - this->size()) |
399 | this->grow(this->size()+NumInputs); |
400 | |
401 | std::uninitialized_fill_n(this->end(), NumInputs, Elt); |
402 | this->set_size(this->size() + NumInputs); |
403 | } |
404 | |
405 | void append(std::initializer_list<T> IL) { |
406 | append(IL.begin(), IL.end()); |
407 | } |
408 | |
409 | // FIXME: Consider assigning over existing elements, rather than clearing & |
410 | // re-initializing them - for all assign(...) variants. |
411 | |
412 | void assign(size_type NumElts, const T &Elt) { |
413 | clear(); |
414 | if (this->capacity() < NumElts) |
415 | this->grow(NumElts); |
416 | this->set_size(NumElts); |
417 | std::uninitialized_fill(this->begin(), this->end(), Elt); |
418 | } |
419 | |
420 | template <typename in_iter, |
421 | typename = typename std::enable_if<std::is_convertible< |
422 | typename std::iterator_traits<in_iter>::iterator_category, |
423 | std::input_iterator_tag>::value>::type> |
424 | void assign(in_iter in_start, in_iter in_end) { |
425 | clear(); |
426 | append(in_start, in_end); |
427 | } |
428 | |
429 | void assign(std::initializer_list<T> IL) { |
430 | clear(); |
431 | append(IL); |
432 | } |
433 | |
434 | iterator erase(const_iterator CI) { |
435 | // Just cast away constness because this is a non-const member function. |
436 | iterator I = const_cast<iterator>(CI); |
437 | |
438 | assert(I >= this->begin() && "Iterator to erase is out of bounds.")((I >= this->begin() && "Iterator to erase is out of bounds." ) ? static_cast<void> (0) : __assert_fail ("I >= this->begin() && \"Iterator to erase is out of bounds.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 438, __PRETTY_FUNCTION__)); |
439 | assert(I < this->end() && "Erasing at past-the-end iterator.")((I < this->end() && "Erasing at past-the-end iterator." ) ? static_cast<void> (0) : __assert_fail ("I < this->end() && \"Erasing at past-the-end iterator.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 439, __PRETTY_FUNCTION__)); |
440 | |
441 | iterator N = I; |
442 | // Shift all elts down one. |
443 | std::move(I+1, this->end(), I); |
444 | // Drop the last elt. |
445 | this->pop_back(); |
446 | return(N); |
447 | } |
448 | |
449 | iterator erase(const_iterator CS, const_iterator CE) { |
450 | // Just cast away constness because this is a non-const member function. |
451 | iterator S = const_cast<iterator>(CS); |
452 | iterator E = const_cast<iterator>(CE); |
453 | |
454 | assert(S >= this->begin() && "Range to erase is out of bounds.")((S >= this->begin() && "Range to erase is out of bounds." ) ? static_cast<void> (0) : __assert_fail ("S >= this->begin() && \"Range to erase is out of bounds.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 454, __PRETTY_FUNCTION__)); |
455 | assert(S <= E && "Trying to erase invalid range.")((S <= E && "Trying to erase invalid range.") ? static_cast <void> (0) : __assert_fail ("S <= E && \"Trying to erase invalid range.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 455, __PRETTY_FUNCTION__)); |
456 | assert(E <= this->end() && "Trying to erase past the end.")((E <= this->end() && "Trying to erase past the end." ) ? static_cast<void> (0) : __assert_fail ("E <= this->end() && \"Trying to erase past the end.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 456, __PRETTY_FUNCTION__)); |
457 | |
458 | iterator N = S; |
459 | // Shift all elts down. |
460 | iterator I = std::move(E, this->end(), S); |
461 | // Drop the last elts. |
462 | this->destroy_range(I, this->end()); |
463 | this->set_size(I - this->begin()); |
464 | return(N); |
465 | } |
466 | |
467 | iterator insert(iterator I, T &&Elt) { |
468 | if (I == this->end()) { // Important special case for empty vector. |
469 | this->push_back(::std::move(Elt)); |
470 | return this->end()-1; |
471 | } |
472 | |
473 | assert(I >= this->begin() && "Insertion iterator is out of bounds.")((I >= this->begin() && "Insertion iterator is out of bounds." ) ? static_cast<void> (0) : __assert_fail ("I >= this->begin() && \"Insertion iterator is out of bounds.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 473, __PRETTY_FUNCTION__)); |
474 | assert(I <= this->end() && "Inserting past the end of the vector.")((I <= this->end() && "Inserting past the end of the vector." ) ? static_cast<void> (0) : __assert_fail ("I <= this->end() && \"Inserting past the end of the vector.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 474, __PRETTY_FUNCTION__)); |
475 | |
476 | if (this->size() >= this->capacity()) { |
477 | size_t EltNo = I-this->begin(); |
478 | this->grow(); |
479 | I = this->begin()+EltNo; |
480 | } |
481 | |
482 | ::new ((void*) this->end()) T(::std::move(this->back())); |
483 | // Push everything else over. |
484 | std::move_backward(I, this->end()-1, this->end()); |
485 | this->set_size(this->size() + 1); |
486 | |
487 | // If we just moved the element we're inserting, be sure to update |
488 | // the reference. |
489 | T *EltPtr = &Elt; |
490 | if (I <= EltPtr && EltPtr < this->end()) |
491 | ++EltPtr; |
492 | |
493 | *I = ::std::move(*EltPtr); |
494 | return I; |
495 | } |
496 | |
497 | iterator insert(iterator I, const T &Elt) { |
498 | if (I == this->end()) { // Important special case for empty vector. |
499 | this->push_back(Elt); |
500 | return this->end()-1; |
501 | } |
502 | |
503 | assert(I >= this->begin() && "Insertion iterator is out of bounds.")((I >= this->begin() && "Insertion iterator is out of bounds." ) ? static_cast<void> (0) : __assert_fail ("I >= this->begin() && \"Insertion iterator is out of bounds.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 503, __PRETTY_FUNCTION__)); |
504 | assert(I <= this->end() && "Inserting past the end of the vector.")((I <= this->end() && "Inserting past the end of the vector." ) ? static_cast<void> (0) : __assert_fail ("I <= this->end() && \"Inserting past the end of the vector.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 504, __PRETTY_FUNCTION__)); |
505 | |
506 | if (this->size() >= this->capacity()) { |
507 | size_t EltNo = I-this->begin(); |
508 | this->grow(); |
509 | I = this->begin()+EltNo; |
510 | } |
511 | ::new ((void*) this->end()) T(std::move(this->back())); |
512 | // Push everything else over. |
513 | std::move_backward(I, this->end()-1, this->end()); |
514 | this->set_size(this->size() + 1); |
515 | |
516 | // If we just moved the element we're inserting, be sure to update |
517 | // the reference. |
518 | const T *EltPtr = &Elt; |
519 | if (I <= EltPtr && EltPtr < this->end()) |
520 | ++EltPtr; |
521 | |
522 | *I = *EltPtr; |
523 | return I; |
524 | } |
525 | |
526 | iterator insert(iterator I, size_type NumToInsert, const T &Elt) { |
527 | // Convert iterator to elt# to avoid invalidating iterator when we reserve() |
528 | size_t InsertElt = I - this->begin(); |
529 | |
530 | if (I == this->end()) { // Important special case for empty vector. |
531 | append(NumToInsert, Elt); |
532 | return this->begin()+InsertElt; |
533 | } |
534 | |
535 | assert(I >= this->begin() && "Insertion iterator is out of bounds.")((I >= this->begin() && "Insertion iterator is out of bounds." ) ? static_cast<void> (0) : __assert_fail ("I >= this->begin() && \"Insertion iterator is out of bounds.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 535, __PRETTY_FUNCTION__)); |
536 | assert(I <= this->end() && "Inserting past the end of the vector.")((I <= this->end() && "Inserting past the end of the vector." ) ? static_cast<void> (0) : __assert_fail ("I <= this->end() && \"Inserting past the end of the vector.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 536, __PRETTY_FUNCTION__)); |
537 | |
538 | // Ensure there is enough space. |
539 | reserve(this->size() + NumToInsert); |
540 | |
541 | // Uninvalidate the iterator. |
542 | I = this->begin()+InsertElt; |
543 | |
544 | // If there are more elements between the insertion point and the end of the |
545 | // range than there are being inserted, we can use a simple approach to |
546 | // insertion. Since we already reserved space, we know that this won't |
547 | // reallocate the vector. |
548 | if (size_t(this->end()-I) >= NumToInsert) { |
549 | T *OldEnd = this->end(); |
550 | append(std::move_iterator<iterator>(this->end() - NumToInsert), |
551 | std::move_iterator<iterator>(this->end())); |
552 | |
553 | // Copy the existing elements that get replaced. |
554 | std::move_backward(I, OldEnd-NumToInsert, OldEnd); |
555 | |
556 | std::fill_n(I, NumToInsert, Elt); |
557 | return I; |
558 | } |
559 | |
560 | // Otherwise, we're inserting more elements than exist already, and we're |
561 | // not inserting at the end. |
562 | |
563 | // Move over the elements that we're about to overwrite. |
564 | T *OldEnd = this->end(); |
565 | this->set_size(this->size() + NumToInsert); |
566 | size_t NumOverwritten = OldEnd-I; |
567 | this->uninitialized_move(I, OldEnd, this->end()-NumOverwritten); |
568 | |
569 | // Replace the overwritten part. |
570 | std::fill_n(I, NumOverwritten, Elt); |
571 | |
572 | // Insert the non-overwritten middle part. |
573 | std::uninitialized_fill_n(OldEnd, NumToInsert-NumOverwritten, Elt); |
574 | return I; |
575 | } |
576 | |
577 | template <typename ItTy, |
578 | typename = typename std::enable_if<std::is_convertible< |
579 | typename std::iterator_traits<ItTy>::iterator_category, |
580 | std::input_iterator_tag>::value>::type> |
581 | iterator insert(iterator I, ItTy From, ItTy To) { |
582 | // Convert iterator to elt# to avoid invalidating iterator when we reserve() |
583 | size_t InsertElt = I - this->begin(); |
584 | |
585 | if (I == this->end()) { // Important special case for empty vector. |
586 | append(From, To); |
587 | return this->begin()+InsertElt; |
588 | } |
589 | |
590 | assert(I >= this->begin() && "Insertion iterator is out of bounds.")((I >= this->begin() && "Insertion iterator is out of bounds." ) ? static_cast<void> (0) : __assert_fail ("I >= this->begin() && \"Insertion iterator is out of bounds.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 590, __PRETTY_FUNCTION__)); |
591 | assert(I <= this->end() && "Inserting past the end of the vector.")((I <= this->end() && "Inserting past the end of the vector." ) ? static_cast<void> (0) : __assert_fail ("I <= this->end() && \"Inserting past the end of the vector.\"" , "/build/llvm-toolchain-snapshot-10~svn373253/include/llvm/ADT/SmallVector.h" , 591, __PRETTY_FUNCTION__)); |
592 | |
593 | size_t NumToInsert = std::distance(From, To); |
594 | |
595 | // Ensure there is enough space. |
596 | reserve(this->size() + NumToInsert); |
597 | |
598 | // Uninvalidate the iterator. |
599 | I = this->begin()+InsertElt; |
600 | |
601 | // If there are more elements between the insertion point and the end of the |
602 | // range than there are being inserted, we can use a simple approach to |
603 | // insertion. Since we already reserved space, we know that this won't |
604 | // reallocate the vector. |
605 | if (size_t(this->end()-I) >= NumToInsert) { |
606 | T *OldEnd = this->end(); |
607 | append(std::move_iterator<iterator>(this->end() - NumToInsert), |
608 | std::move_iterator<iterator>(this->end())); |
609 | |
610 | // Copy the existing elements that get replaced. |
611 | std::move_backward(I, OldEnd-NumToInsert, OldEnd); |
612 | |
613 | std::copy(From, To, I); |
614 | return I; |
615 | } |
616 | |
617 | // Otherwise, we're inserting more elements than exist already, and we're |
618 | // not inserting at the end. |
619 | |
620 | // Move over the elements that we're about to overwrite. |
621 | T *OldEnd = this->end(); |
622 | this->set_size(this->size() + NumToInsert); |
623 | size_t NumOverwritten = OldEnd-I; |
624 | this->uninitialized_move(I, OldEnd, this->end()-NumOverwritten); |
625 | |
626 | // Replace the overwritten part. |
627 | for (T *J = I; NumOverwritten > 0; --NumOverwritten) { |
628 | *J = *From; |
629 | ++J; ++From; |
630 | } |
631 | |
632 | // Insert the non-overwritten middle part. |
633 | this->uninitialized_copy(From, To, OldEnd); |
634 | return I; |
635 | } |
636 | |
637 | void insert(iterator I, std::initializer_list<T> IL) { |
638 | insert(I, IL.begin(), IL.end()); |
639 | } |
640 | |
641 | template <typename... ArgTypes> reference emplace_back(ArgTypes &&... Args) { |
642 | if (LLVM_UNLIKELY(this->size() >= this->capacity())__builtin_expect((bool)(this->size() >= this->capacity ()), false)) |
643 | this->grow(); |
644 | ::new ((void *)this->end()) T(std::forward<ArgTypes>(Args)...); |
645 | this->set_size(this->size() + 1); |
646 | return this->back(); |
647 | } |
648 | |
649 | SmallVectorImpl &operator=(const SmallVectorImpl &RHS); |
650 | |
651 | SmallVectorImpl &operator=(SmallVectorImpl &&RHS); |
652 | |
653 | bool operator==(const SmallVectorImpl &RHS) const { |
654 | if (this->size() != RHS.size()) return false; |
655 | return std::equal(this->begin(), this->end(), RHS.begin()); |
656 | } |
657 | bool operator!=(const SmallVectorImpl &RHS) const { |
658 | return !(*this == RHS); |
659 | } |
660 | |
661 | bool operator<(const SmallVectorImpl &RHS) const { |
662 | return std::lexicographical_compare(this->begin(), this->end(), |
663 | RHS.begin(), RHS.end()); |
664 | } |
665 | }; |
666 | |
667 | template <typename T> |
668 | void SmallVectorImpl<T>::swap(SmallVectorImpl<T> &RHS) { |
669 | if (this == &RHS) return; |
670 | |
671 | // We can only avoid copying elements if neither vector is small. |
672 | if (!this->isSmall() && !RHS.isSmall()) { |
673 | std::swap(this->BeginX, RHS.BeginX); |
674 | std::swap(this->Size, RHS.Size); |
675 | std::swap(this->Capacity, RHS.Capacity); |
676 | return; |
677 | } |
678 | if (RHS.size() > this->capacity()) |
679 | this->grow(RHS.size()); |
680 | if (this->size() > RHS.capacity()) |
681 | RHS.grow(this->size()); |
682 | |
683 | // Swap the shared elements. |
684 | size_t NumShared = this->size(); |
685 | if (NumShared > RHS.size()) NumShared = RHS.size(); |
686 | for (size_type i = 0; i != NumShared; ++i) |
687 | std::swap((*this)[i], RHS[i]); |
688 | |
689 | // Copy over the extra elts. |
690 | if (this->size() > RHS.size()) { |
691 | size_t EltDiff = this->size() - RHS.size(); |
692 | this->uninitialized_copy(this->begin()+NumShared, this->end(), RHS.end()); |
693 | RHS.set_size(RHS.size() + EltDiff); |
694 | this->destroy_range(this->begin()+NumShared, this->end()); |
695 | this->set_size(NumShared); |
696 | } else if (RHS.size() > this->size()) { |
697 | size_t EltDiff = RHS.size() - this->size(); |
698 | this->uninitialized_copy(RHS.begin()+NumShared, RHS.end(), this->end()); |
699 | this->set_size(this->size() + EltDiff); |
700 | this->destroy_range(RHS.begin()+NumShared, RHS.end()); |
701 | RHS.set_size(NumShared); |
702 | } |
703 | } |
704 | |
705 | template <typename T> |
706 | SmallVectorImpl<T> &SmallVectorImpl<T>:: |
707 | operator=(const SmallVectorImpl<T> &RHS) { |
708 | // Avoid self-assignment. |
709 | if (this == &RHS) return *this; |
710 | |
711 | // If we already have sufficient space, assign the common elements, then |
712 | // destroy any excess. |
713 | size_t RHSSize = RHS.size(); |
714 | size_t CurSize = this->size(); |
715 | if (CurSize >= RHSSize) { |
716 | // Assign common elements. |
717 | iterator NewEnd; |
718 | if (RHSSize) |
719 | NewEnd = std::copy(RHS.begin(), RHS.begin()+RHSSize, this->begin()); |
720 | else |
721 | NewEnd = this->begin(); |
722 | |
723 | // Destroy excess elements. |
724 | this->destroy_range(NewEnd, this->end()); |
725 | |
726 | // Trim. |
727 | this->set_size(RHSSize); |
728 | return *this; |
729 | } |
730 | |
731 | // If we have to grow to have enough elements, destroy the current elements. |
732 | // This allows us to avoid copying them during the grow. |
733 | // FIXME: don't do this if they're efficiently moveable. |
734 | if (this->capacity() < RHSSize) { |
735 | // Destroy current elements. |
736 | this->destroy_range(this->begin(), this->end()); |
737 | this->set_size(0); |
738 | CurSize = 0; |
739 | this->grow(RHSSize); |
740 | } else if (CurSize) { |
741 | // Otherwise, use assignment for the already-constructed elements. |
742 | std::copy(RHS.begin(), RHS.begin()+CurSize, this->begin()); |
743 | } |
744 | |
745 | // Copy construct the new elements in place. |
746 | this->uninitialized_copy(RHS.begin()+CurSize, RHS.end(), |
747 | this->begin()+CurSize); |
748 | |
749 | // Set end. |
750 | this->set_size(RHSSize); |
751 | return *this; |
752 | } |
753 | |
754 | template <typename T> |
755 | SmallVectorImpl<T> &SmallVectorImpl<T>::operator=(SmallVectorImpl<T> &&RHS) { |
756 | // Avoid self-assignment. |
757 | if (this == &RHS) return *this; |
758 | |
759 | // If the RHS isn't small, clear this vector and then steal its buffer. |
760 | if (!RHS.isSmall()) { |
761 | this->destroy_range(this->begin(), this->end()); |
762 | if (!this->isSmall()) free(this->begin()); |
763 | this->BeginX = RHS.BeginX; |
764 | this->Size = RHS.Size; |
765 | this->Capacity = RHS.Capacity; |
766 | RHS.resetToSmall(); |
767 | return *this; |
768 | } |
769 | |
770 | // If we already have sufficient space, assign the common elements, then |
771 | // destroy any excess. |
772 | size_t RHSSize = RHS.size(); |
773 | size_t CurSize = this->size(); |
774 | if (CurSize >= RHSSize) { |
775 | // Assign common elements. |
776 | iterator NewEnd = this->begin(); |
777 | if (RHSSize) |
778 | NewEnd = std::move(RHS.begin(), RHS.end(), NewEnd); |
779 | |
780 | // Destroy excess elements and trim the bounds. |
781 | this->destroy_range(NewEnd, this->end()); |
782 | this->set_size(RHSSize); |
783 | |
784 | // Clear the RHS. |
785 | RHS.clear(); |
786 | |
787 | return *this; |
788 | } |
789 | |
790 | // If we have to grow to have enough elements, destroy the current elements. |
791 | // This allows us to avoid copying them during the grow. |
792 | // FIXME: this may not actually make any sense if we can efficiently move |
793 | // elements. |
794 | if (this->capacity() < RHSSize) { |
795 | // Destroy current elements. |
796 | this->destroy_range(this->begin(), this->end()); |
797 | this->set_size(0); |
798 | CurSize = 0; |
799 | this->grow(RHSSize); |
800 | } else if (CurSize) { |
801 | // Otherwise, use assignment for the already-constructed elements. |
802 | std::move(RHS.begin(), RHS.begin()+CurSize, this->begin()); |
803 | } |
804 | |
805 | // Move-construct the new elements in place. |
806 | this->uninitialized_move(RHS.begin()+CurSize, RHS.end(), |
807 | this->begin()+CurSize); |
808 | |
809 | // Set end. |
810 | this->set_size(RHSSize); |
811 | |
812 | RHS.clear(); |
813 | return *this; |
814 | } |
815 | |
816 | /// Storage for the SmallVector elements. This is specialized for the N=0 case |
817 | /// to avoid allocating unnecessary storage. |
818 | template <typename T, unsigned N> |
819 | struct SmallVectorStorage { |
820 | AlignedCharArrayUnion<T> InlineElts[N]; |
821 | }; |
822 | |
823 | /// We need the storage to be properly aligned even for small-size of 0 so that |
824 | /// the pointer math in \a SmallVectorTemplateCommon::getFirstEl() is |
825 | /// well-defined. |
826 | template <typename T> struct alignas(alignof(T)) SmallVectorStorage<T, 0> {}; |
827 | |
828 | /// This is a 'vector' (really, a variable-sized array), optimized |
829 | /// for the case when the array is small. It contains some number of elements |
830 | /// in-place, which allows it to avoid heap allocation when the actual number of |
831 | /// elements is below that threshold. This allows normal "small" cases to be |
832 | /// fast without losing generality for large inputs. |
833 | /// |
834 | /// Note that this does not attempt to be exception safe. |
835 | /// |
836 | template <typename T, unsigned N> |
837 | class SmallVector : public SmallVectorImpl<T>, SmallVectorStorage<T, N> { |
838 | public: |
839 | SmallVector() : SmallVectorImpl<T>(N) {} |
840 | |
841 | ~SmallVector() { |
842 | // Destroy the constructed elements in the vector. |
843 | this->destroy_range(this->begin(), this->end()); |
844 | } |
845 | |
846 | explicit SmallVector(size_t Size, const T &Value = T()) |
847 | : SmallVectorImpl<T>(N) { |
848 | this->assign(Size, Value); |
849 | } |
850 | |
851 | template <typename ItTy, |
852 | typename = typename std::enable_if<std::is_convertible< |
853 | typename std::iterator_traits<ItTy>::iterator_category, |
854 | std::input_iterator_tag>::value>::type> |
855 | SmallVector(ItTy S, ItTy E) : SmallVectorImpl<T>(N) { |
856 | this->append(S, E); |
857 | } |
858 | |
859 | template <typename RangeTy> |
860 | explicit SmallVector(const iterator_range<RangeTy> &R) |
861 | : SmallVectorImpl<T>(N) { |
862 | this->append(R.begin(), R.end()); |
863 | } |
864 | |
865 | SmallVector(std::initializer_list<T> IL) : SmallVectorImpl<T>(N) { |
866 | this->assign(IL); |
867 | } |
868 | |
869 | SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(N) { |
870 | if (!RHS.empty()) |
871 | SmallVectorImpl<T>::operator=(RHS); |
872 | } |
873 | |
874 | const SmallVector &operator=(const SmallVector &RHS) { |
875 | SmallVectorImpl<T>::operator=(RHS); |
876 | return *this; |
877 | } |
878 | |
879 | SmallVector(SmallVector &&RHS) : SmallVectorImpl<T>(N) { |
880 | if (!RHS.empty()) |
881 | SmallVectorImpl<T>::operator=(::std::move(RHS)); |
882 | } |
883 | |
884 | SmallVector(SmallVectorImpl<T> &&RHS) : SmallVectorImpl<T>(N) { |
885 | if (!RHS.empty()) |
886 | SmallVectorImpl<T>::operator=(::std::move(RHS)); |
887 | } |
888 | |
889 | const SmallVector &operator=(SmallVector &&RHS) { |
890 | SmallVectorImpl<T>::operator=(::std::move(RHS)); |
891 | return *this; |
892 | } |
893 | |
894 | const SmallVector &operator=(SmallVectorImpl<T> &&RHS) { |
895 | SmallVectorImpl<T>::operator=(::std::move(RHS)); |
896 | return *this; |
897 | } |
898 | |
899 | const SmallVector &operator=(std::initializer_list<T> IL) { |
900 | this->assign(IL); |
901 | return *this; |
902 | } |
903 | }; |
904 | |
905 | template <typename T, unsigned N> |
906 | inline size_t capacity_in_bytes(const SmallVector<T, N> &X) { |
907 | return X.capacity_in_bytes(); |
908 | } |
909 | |
910 | } // end namespace llvm |
911 | |
912 | namespace std { |
913 | |
914 | /// Implement std::swap in terms of SmallVector swap. |
915 | template<typename T> |
916 | inline void |
917 | swap(llvm::SmallVectorImpl<T> &LHS, llvm::SmallVectorImpl<T> &RHS) { |
918 | LHS.swap(RHS); |
919 | } |
920 | |
921 | /// Implement std::swap in terms of SmallVector swap. |
922 | template<typename T, unsigned N> |
923 | inline void |
924 | swap(llvm::SmallVector<T, N> &LHS, llvm::SmallVector<T, N> &RHS) { |
925 | LHS.swap(RHS); |
926 | } |
927 | |
928 | } // end namespace std |
929 | |
930 | #endif // LLVM_ADT_SMALLVECTOR_H |