File: | clang/lib/AST/ExprConstant.cpp |
Warning: | line 5850, column 7 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 "Interp/Context.h" | |||
36 | #include "Interp/Frame.h" | |||
37 | #include "Interp/State.h" | |||
38 | #include "clang/AST/APValue.h" | |||
39 | #include "clang/AST/ASTContext.h" | |||
40 | #include "clang/AST/ASTDiagnostic.h" | |||
41 | #include "clang/AST/ASTLambda.h" | |||
42 | #include "clang/AST/Attr.h" | |||
43 | #include "clang/AST/CXXInheritance.h" | |||
44 | #include "clang/AST/CharUnits.h" | |||
45 | #include "clang/AST/CurrentSourceLocExprScope.h" | |||
46 | #include "clang/AST/Expr.h" | |||
47 | #include "clang/AST/OSLog.h" | |||
48 | #include "clang/AST/OptionalDiagnostic.h" | |||
49 | #include "clang/AST/RecordLayout.h" | |||
50 | #include "clang/AST/StmtVisitor.h" | |||
51 | #include "clang/AST/TypeLoc.h" | |||
52 | #include "clang/Basic/Builtins.h" | |||
53 | #include "clang/Basic/TargetInfo.h" | |||
54 | #include "llvm/ADT/APFixedPoint.h" | |||
55 | #include "llvm/ADT/Optional.h" | |||
56 | #include "llvm/ADT/SmallBitVector.h" | |||
57 | #include "llvm/Support/Debug.h" | |||
58 | #include "llvm/Support/SaveAndRestore.h" | |||
59 | #include "llvm/Support/raw_ostream.h" | |||
60 | #include <cstring> | |||
61 | #include <functional> | |||
62 | ||||
63 | #define DEBUG_TYPE"exprconstant" "exprconstant" | |||
64 | ||||
65 | using namespace clang; | |||
66 | using llvm::APFixedPoint; | |||
67 | using llvm::APInt; | |||
68 | using llvm::APSInt; | |||
69 | using llvm::APFloat; | |||
70 | using llvm::FixedPointSemantics; | |||
71 | using llvm::Optional; | |||
72 | ||||
73 | namespace { | |||
74 | struct LValue; | |||
75 | class CallStackFrame; | |||
76 | class EvalInfo; | |||
77 | ||||
78 | using SourceLocExprScopeGuard = | |||
79 | CurrentSourceLocExprScope::SourceLocExprScopeGuard; | |||
80 | ||||
81 | static QualType getType(APValue::LValueBase B) { | |||
82 | return B.getType(); | |||
83 | } | |||
84 | ||||
85 | /// Get an LValue path entry, which is known to not be an array index, as a | |||
86 | /// field declaration. | |||
87 | static const FieldDecl *getAsField(APValue::LValuePathEntry E) { | |||
88 | return dyn_cast_or_null<FieldDecl>(E.getAsBaseOrMember().getPointer()); | |||
89 | } | |||
90 | /// Get an LValue path entry, which is known to not be an array index, as a | |||
91 | /// base class declaration. | |||
92 | static const CXXRecordDecl *getAsBaseClass(APValue::LValuePathEntry E) { | |||
93 | return dyn_cast_or_null<CXXRecordDecl>(E.getAsBaseOrMember().getPointer()); | |||
94 | } | |||
95 | /// Determine whether this LValue path entry for a base class names a virtual | |||
96 | /// base class. | |||
97 | static bool isVirtualBaseClass(APValue::LValuePathEntry E) { | |||
98 | return E.getAsBaseOrMember().getInt(); | |||
99 | } | |||
100 | ||||
101 | /// Given an expression, determine the type used to store the result of | |||
102 | /// evaluating that expression. | |||
103 | static QualType getStorageType(const ASTContext &Ctx, const Expr *E) { | |||
104 | if (E->isPRValue()) | |||
105 | return E->getType(); | |||
106 | return Ctx.getLValueReferenceType(E->getType()); | |||
107 | } | |||
108 | ||||
109 | /// Given a CallExpr, try to get the alloc_size attribute. May return null. | |||
110 | static const AllocSizeAttr *getAllocSizeAttr(const CallExpr *CE) { | |||
111 | if (const FunctionDecl *DirectCallee = CE->getDirectCallee()) | |||
112 | return DirectCallee->getAttr<AllocSizeAttr>(); | |||
113 | if (const Decl *IndirectCallee = CE->getCalleeDecl()) | |||
114 | return IndirectCallee->getAttr<AllocSizeAttr>(); | |||
115 | return nullptr; | |||
116 | } | |||
117 | ||||
118 | /// Attempts to unwrap a CallExpr (with an alloc_size attribute) from an Expr. | |||
119 | /// This will look through a single cast. | |||
120 | /// | |||
121 | /// Returns null if we couldn't unwrap a function with alloc_size. | |||
122 | static const CallExpr *tryUnwrapAllocSizeCall(const Expr *E) { | |||
123 | if (!E->getType()->isPointerType()) | |||
124 | return nullptr; | |||
125 | ||||
126 | E = E->IgnoreParens(); | |||
127 | // If we're doing a variable assignment from e.g. malloc(N), there will | |||
128 | // probably be a cast of some kind. In exotic cases, we might also see a | |||
129 | // top-level ExprWithCleanups. Ignore them either way. | |||
130 | if (const auto *FE = dyn_cast<FullExpr>(E)) | |||
131 | E = FE->getSubExpr()->IgnoreParens(); | |||
132 | ||||
133 | if (const auto *Cast = dyn_cast<CastExpr>(E)) | |||
134 | E = Cast->getSubExpr()->IgnoreParens(); | |||
135 | ||||
136 | if (const auto *CE = dyn_cast<CallExpr>(E)) | |||
137 | return getAllocSizeAttr(CE) ? CE : nullptr; | |||
138 | return nullptr; | |||
139 | } | |||
140 | ||||
141 | /// Determines whether or not the given Base contains a call to a function | |||
142 | /// with the alloc_size attribute. | |||
143 | static bool isBaseAnAllocSizeCall(APValue::LValueBase Base) { | |||
144 | const auto *E = Base.dyn_cast<const Expr *>(); | |||
145 | return E && E->getType()->isPointerType() && tryUnwrapAllocSizeCall(E); | |||
146 | } | |||
147 | ||||
148 | /// Determines whether the given kind of constant expression is only ever | |||
149 | /// used for name mangling. If so, it's permitted to reference things that we | |||
150 | /// can't generate code for (in particular, dllimported functions). | |||
151 | static bool isForManglingOnly(ConstantExprKind Kind) { | |||
152 | switch (Kind) { | |||
153 | case ConstantExprKind::Normal: | |||
154 | case ConstantExprKind::ClassTemplateArgument: | |||
155 | case ConstantExprKind::ImmediateInvocation: | |||
156 | // Note that non-type template arguments of class type are emitted as | |||
157 | // template parameter objects. | |||
158 | return false; | |||
159 | ||||
160 | case ConstantExprKind::NonClassTemplateArgument: | |||
161 | return true; | |||
162 | } | |||
163 | llvm_unreachable("unknown ConstantExprKind")::llvm::llvm_unreachable_internal("unknown ConstantExprKind", "clang/lib/AST/ExprConstant.cpp", 163); | |||
164 | } | |||
165 | ||||
166 | static bool isTemplateArgument(ConstantExprKind Kind) { | |||
167 | switch (Kind) { | |||
168 | case ConstantExprKind::Normal: | |||
169 | case ConstantExprKind::ImmediateInvocation: | |||
170 | return false; | |||
171 | ||||
172 | case ConstantExprKind::ClassTemplateArgument: | |||
173 | case ConstantExprKind::NonClassTemplateArgument: | |||
174 | return true; | |||
175 | } | |||
176 | llvm_unreachable("unknown ConstantExprKind")::llvm::llvm_unreachable_internal("unknown ConstantExprKind", "clang/lib/AST/ExprConstant.cpp", 176); | |||
177 | } | |||
178 | ||||
179 | /// The bound to claim that an array of unknown bound has. | |||
180 | /// The value in MostDerivedArraySize is undefined in this case. So, set it | |||
181 | /// to an arbitrary value that's likely to loudly break things if it's used. | |||
182 | static const uint64_t AssumedSizeForUnsizedArray = | |||
183 | std::numeric_limits<uint64_t>::max() / 2; | |||
184 | ||||
185 | /// Determines if an LValue with the given LValueBase will have an unsized | |||
186 | /// array in its designator. | |||
187 | /// Find the path length and type of the most-derived subobject in the given | |||
188 | /// path, and find the size of the containing array, if any. | |||
189 | static unsigned | |||
190 | findMostDerivedSubobject(ASTContext &Ctx, APValue::LValueBase Base, | |||
191 | ArrayRef<APValue::LValuePathEntry> Path, | |||
192 | uint64_t &ArraySize, QualType &Type, bool &IsArray, | |||
193 | bool &FirstEntryIsUnsizedArray) { | |||
194 | // This only accepts LValueBases from APValues, and APValues don't support | |||
195 | // arrays that lack size info. | |||
196 | assert(!isBaseAnAllocSizeCall(Base) &&(static_cast <bool> (!isBaseAnAllocSizeCall(Base) && "Unsized arrays shouldn't appear here") ? void (0) : __assert_fail ("!isBaseAnAllocSizeCall(Base) && \"Unsized arrays shouldn't appear here\"" , "clang/lib/AST/ExprConstant.cpp", 197, __extension__ __PRETTY_FUNCTION__ )) | |||
197 | "Unsized arrays shouldn't appear here")(static_cast <bool> (!isBaseAnAllocSizeCall(Base) && "Unsized arrays shouldn't appear here") ? void (0) : __assert_fail ("!isBaseAnAllocSizeCall(Base) && \"Unsized arrays shouldn't appear here\"" , "clang/lib/AST/ExprConstant.cpp", 197, __extension__ __PRETTY_FUNCTION__ )); | |||
198 | unsigned MostDerivedLength = 0; | |||
199 | Type = getType(Base); | |||
200 | ||||
201 | for (unsigned I = 0, N = Path.size(); I != N; ++I) { | |||
202 | if (Type->isArrayType()) { | |||
203 | const ArrayType *AT = Ctx.getAsArrayType(Type); | |||
204 | Type = AT->getElementType(); | |||
205 | MostDerivedLength = I + 1; | |||
206 | IsArray = true; | |||
207 | ||||
208 | if (auto *CAT = dyn_cast<ConstantArrayType>(AT)) { | |||
209 | ArraySize = CAT->getSize().getZExtValue(); | |||
210 | } else { | |||
211 | assert(I == 0 && "unexpected unsized array designator")(static_cast <bool> (I == 0 && "unexpected unsized array designator" ) ? void (0) : __assert_fail ("I == 0 && \"unexpected unsized array designator\"" , "clang/lib/AST/ExprConstant.cpp", 211, __extension__ __PRETTY_FUNCTION__ )); | |||
212 | FirstEntryIsUnsizedArray = true; | |||
213 | ArraySize = AssumedSizeForUnsizedArray; | |||
214 | } | |||
215 | } else if (Type->isAnyComplexType()) { | |||
216 | const ComplexType *CT = Type->castAs<ComplexType>(); | |||
217 | Type = CT->getElementType(); | |||
218 | ArraySize = 2; | |||
219 | MostDerivedLength = I + 1; | |||
220 | IsArray = true; | |||
221 | } else if (const FieldDecl *FD = getAsField(Path[I])) { | |||
222 | Type = FD->getType(); | |||
223 | ArraySize = 0; | |||
224 | MostDerivedLength = I + 1; | |||
225 | IsArray = false; | |||
226 | } else { | |||
227 | // Path[I] describes a base class. | |||
228 | ArraySize = 0; | |||
229 | IsArray = false; | |||
230 | } | |||
231 | } | |||
232 | return MostDerivedLength; | |||
233 | } | |||
234 | ||||
235 | /// A path from a glvalue to a subobject of that glvalue. | |||
236 | struct SubobjectDesignator { | |||
237 | /// True if the subobject was named in a manner not supported by C++11. Such | |||
238 | /// lvalues can still be folded, but they are not core constant expressions | |||
239 | /// and we cannot perform lvalue-to-rvalue conversions on them. | |||
240 | unsigned Invalid : 1; | |||
241 | ||||
242 | /// Is this a pointer one past the end of an object? | |||
243 | unsigned IsOnePastTheEnd : 1; | |||
244 | ||||
245 | /// Indicator of whether the first entry is an unsized array. | |||
246 | unsigned FirstEntryIsAnUnsizedArray : 1; | |||
247 | ||||
248 | /// Indicator of whether the most-derived object is an array element. | |||
249 | unsigned MostDerivedIsArrayElement : 1; | |||
250 | ||||
251 | /// The length of the path to the most-derived object of which this is a | |||
252 | /// subobject. | |||
253 | unsigned MostDerivedPathLength : 28; | |||
254 | ||||
255 | /// The size of the array of which the most-derived object is an element. | |||
256 | /// This will always be 0 if the most-derived object is not an array | |||
257 | /// element. 0 is not an indicator of whether or not the most-derived object | |||
258 | /// is an array, however, because 0-length arrays are allowed. | |||
259 | /// | |||
260 | /// If the current array is an unsized array, the value of this is | |||
261 | /// undefined. | |||
262 | uint64_t MostDerivedArraySize; | |||
263 | ||||
264 | /// The type of the most derived object referred to by this address. | |||
265 | QualType MostDerivedType; | |||
266 | ||||
267 | typedef APValue::LValuePathEntry PathEntry; | |||
268 | ||||
269 | /// The entries on the path from the glvalue to the designated subobject. | |||
270 | SmallVector<PathEntry, 8> Entries; | |||
271 | ||||
272 | SubobjectDesignator() : Invalid(true) {} | |||
273 | ||||
274 | explicit SubobjectDesignator(QualType T) | |||
275 | : Invalid(false), IsOnePastTheEnd(false), | |||
276 | FirstEntryIsAnUnsizedArray(false), MostDerivedIsArrayElement(false), | |||
277 | MostDerivedPathLength(0), MostDerivedArraySize(0), | |||
278 | MostDerivedType(T) {} | |||
279 | ||||
280 | SubobjectDesignator(ASTContext &Ctx, const APValue &V) | |||
281 | : Invalid(!V.isLValue() || !V.hasLValuePath()), IsOnePastTheEnd(false), | |||
282 | FirstEntryIsAnUnsizedArray(false), MostDerivedIsArrayElement(false), | |||
283 | MostDerivedPathLength(0), MostDerivedArraySize(0) { | |||
284 | assert(V.isLValue() && "Non-LValue used to make an LValue designator?")(static_cast <bool> (V.isLValue() && "Non-LValue used to make an LValue designator?" ) ? void (0) : __assert_fail ("V.isLValue() && \"Non-LValue used to make an LValue designator?\"" , "clang/lib/AST/ExprConstant.cpp", 284, __extension__ __PRETTY_FUNCTION__ )); | |||
285 | if (!Invalid) { | |||
286 | IsOnePastTheEnd = V.isLValueOnePastTheEnd(); | |||
287 | ArrayRef<PathEntry> VEntries = V.getLValuePath(); | |||
288 | Entries.insert(Entries.end(), VEntries.begin(), VEntries.end()); | |||
289 | if (V.getLValueBase()) { | |||
290 | bool IsArray = false; | |||
291 | bool FirstIsUnsizedArray = false; | |||
292 | MostDerivedPathLength = findMostDerivedSubobject( | |||
293 | Ctx, V.getLValueBase(), V.getLValuePath(), MostDerivedArraySize, | |||
294 | MostDerivedType, IsArray, FirstIsUnsizedArray); | |||
295 | MostDerivedIsArrayElement = IsArray; | |||
296 | FirstEntryIsAnUnsizedArray = FirstIsUnsizedArray; | |||
297 | } | |||
298 | } | |||
299 | } | |||
300 | ||||
301 | void truncate(ASTContext &Ctx, APValue::LValueBase Base, | |||
302 | unsigned NewLength) { | |||
303 | if (Invalid) | |||
304 | return; | |||
305 | ||||
306 | assert(Base && "cannot truncate path for null pointer")(static_cast <bool> (Base && "cannot truncate path for null pointer" ) ? void (0) : __assert_fail ("Base && \"cannot truncate path for null pointer\"" , "clang/lib/AST/ExprConstant.cpp", 306, __extension__ __PRETTY_FUNCTION__ )); | |||
307 | assert(NewLength <= Entries.size() && "not a truncation")(static_cast <bool> (NewLength <= Entries.size() && "not a truncation") ? void (0) : __assert_fail ("NewLength <= Entries.size() && \"not a truncation\"" , "clang/lib/AST/ExprConstant.cpp", 307, __extension__ __PRETTY_FUNCTION__ )); | |||
308 | ||||
309 | if (NewLength == Entries.size()) | |||
310 | return; | |||
311 | Entries.resize(NewLength); | |||
312 | ||||
313 | bool IsArray = false; | |||
314 | bool FirstIsUnsizedArray = false; | |||
315 | MostDerivedPathLength = findMostDerivedSubobject( | |||
316 | Ctx, Base, Entries, MostDerivedArraySize, MostDerivedType, IsArray, | |||
317 | FirstIsUnsizedArray); | |||
318 | MostDerivedIsArrayElement = IsArray; | |||
319 | FirstEntryIsAnUnsizedArray = FirstIsUnsizedArray; | |||
320 | } | |||
321 | ||||
322 | void setInvalid() { | |||
323 | Invalid = true; | |||
324 | Entries.clear(); | |||
325 | } | |||
326 | ||||
327 | /// Determine whether the most derived subobject is an array without a | |||
328 | /// known bound. | |||
329 | bool isMostDerivedAnUnsizedArray() const { | |||
330 | assert(!Invalid && "Calling this makes no sense on invalid designators")(static_cast <bool> (!Invalid && "Calling this makes no sense on invalid designators" ) ? void (0) : __assert_fail ("!Invalid && \"Calling this makes no sense on invalid designators\"" , "clang/lib/AST/ExprConstant.cpp", 330, __extension__ __PRETTY_FUNCTION__ )); | |||
331 | return Entries.size() == 1 && FirstEntryIsAnUnsizedArray; | |||
332 | } | |||
333 | ||||
334 | /// Determine what the most derived array's size is. Results in an assertion | |||
335 | /// failure if the most derived array lacks a size. | |||
336 | uint64_t getMostDerivedArraySize() const { | |||
337 | assert(!isMostDerivedAnUnsizedArray() && "Unsized array has no size")(static_cast <bool> (!isMostDerivedAnUnsizedArray() && "Unsized array has no size") ? void (0) : __assert_fail ("!isMostDerivedAnUnsizedArray() && \"Unsized array has no size\"" , "clang/lib/AST/ExprConstant.cpp", 337, __extension__ __PRETTY_FUNCTION__ )); | |||
338 | return MostDerivedArraySize; | |||
339 | } | |||
340 | ||||
341 | /// Determine whether this is a one-past-the-end pointer. | |||
342 | bool isOnePastTheEnd() const { | |||
343 | assert(!Invalid)(static_cast <bool> (!Invalid) ? void (0) : __assert_fail ("!Invalid", "clang/lib/AST/ExprConstant.cpp", 343, __extension__ __PRETTY_FUNCTION__)); | |||
344 | if (IsOnePastTheEnd) | |||
345 | return true; | |||
346 | if (!isMostDerivedAnUnsizedArray() && MostDerivedIsArrayElement && | |||
347 | Entries[MostDerivedPathLength - 1].getAsArrayIndex() == | |||
348 | MostDerivedArraySize) | |||
349 | return true; | |||
350 | return false; | |||
351 | } | |||
352 | ||||
353 | /// Get the range of valid index adjustments in the form | |||
354 | /// {maximum value that can be subtracted from this pointer, | |||
355 | /// maximum value that can be added to this pointer} | |||
356 | std::pair<uint64_t, uint64_t> validIndexAdjustments() { | |||
357 | if (Invalid || isMostDerivedAnUnsizedArray()) | |||
358 | return {0, 0}; | |||
359 | ||||
360 | // [expr.add]p4: For the purposes of these operators, a pointer to a | |||
361 | // nonarray object behaves the same as a pointer to the first element of | |||
362 | // an array of length one with the type of the object as its element type. | |||
363 | bool IsArray = MostDerivedPathLength == Entries.size() && | |||
364 | MostDerivedIsArrayElement; | |||
365 | uint64_t ArrayIndex = IsArray ? Entries.back().getAsArrayIndex() | |||
366 | : (uint64_t)IsOnePastTheEnd; | |||
367 | uint64_t ArraySize = | |||
368 | IsArray ? getMostDerivedArraySize() : (uint64_t)1; | |||
369 | return {ArrayIndex, ArraySize - ArrayIndex}; | |||
370 | } | |||
371 | ||||
372 | /// Check that this refers to a valid subobject. | |||
373 | bool isValidSubobject() const { | |||
374 | if (Invalid) | |||
375 | return false; | |||
376 | return !isOnePastTheEnd(); | |||
377 | } | |||
378 | /// Check that this refers to a valid subobject, and if not, produce a | |||
379 | /// relevant diagnostic and set the designator as invalid. | |||
380 | bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK); | |||
381 | ||||
382 | /// Get the type of the designated object. | |||
383 | QualType getType(ASTContext &Ctx) const { | |||
384 | assert(!Invalid && "invalid designator has no subobject type")(static_cast <bool> (!Invalid && "invalid designator has no subobject type" ) ? void (0) : __assert_fail ("!Invalid && \"invalid designator has no subobject type\"" , "clang/lib/AST/ExprConstant.cpp", 384, __extension__ __PRETTY_FUNCTION__ )); | |||
385 | return MostDerivedPathLength == Entries.size() | |||
386 | ? MostDerivedType | |||
387 | : Ctx.getRecordType(getAsBaseClass(Entries.back())); | |||
388 | } | |||
389 | ||||
390 | /// Update this designator to refer to the first element within this array. | |||
391 | void addArrayUnchecked(const ConstantArrayType *CAT) { | |||
392 | Entries.push_back(PathEntry::ArrayIndex(0)); | |||
393 | ||||
394 | // This is a most-derived object. | |||
395 | MostDerivedType = CAT->getElementType(); | |||
396 | MostDerivedIsArrayElement = true; | |||
397 | MostDerivedArraySize = CAT->getSize().getZExtValue(); | |||
398 | MostDerivedPathLength = Entries.size(); | |||
399 | } | |||
400 | /// Update this designator to refer to the first element within the array of | |||
401 | /// elements of type T. This is an array of unknown size. | |||
402 | void addUnsizedArrayUnchecked(QualType ElemTy) { | |||
403 | Entries.push_back(PathEntry::ArrayIndex(0)); | |||
404 | ||||
405 | MostDerivedType = ElemTy; | |||
406 | MostDerivedIsArrayElement = true; | |||
407 | // The value in MostDerivedArraySize is undefined in this case. So, set it | |||
408 | // to an arbitrary value that's likely to loudly break things if it's | |||
409 | // used. | |||
410 | MostDerivedArraySize = AssumedSizeForUnsizedArray; | |||
411 | MostDerivedPathLength = Entries.size(); | |||
412 | } | |||
413 | /// Update this designator to refer to the given base or member of this | |||
414 | /// object. | |||
415 | void addDeclUnchecked(const Decl *D, bool Virtual = false) { | |||
416 | Entries.push_back(APValue::BaseOrMemberType(D, Virtual)); | |||
417 | ||||
418 | // If this isn't a base class, it's a new most-derived object. | |||
419 | if (const FieldDecl *FD = dyn_cast<FieldDecl>(D)) { | |||
420 | MostDerivedType = FD->getType(); | |||
421 | MostDerivedIsArrayElement = false; | |||
422 | MostDerivedArraySize = 0; | |||
423 | MostDerivedPathLength = Entries.size(); | |||
424 | } | |||
425 | } | |||
426 | /// Update this designator to refer to the given complex component. | |||
427 | void addComplexUnchecked(QualType EltTy, bool Imag) { | |||
428 | Entries.push_back(PathEntry::ArrayIndex(Imag)); | |||
429 | ||||
430 | // This is technically a most-derived object, though in practice this | |||
431 | // is unlikely to matter. | |||
432 | MostDerivedType = EltTy; | |||
433 | MostDerivedIsArrayElement = true; | |||
434 | MostDerivedArraySize = 2; | |||
435 | MostDerivedPathLength = Entries.size(); | |||
436 | } | |||
437 | void diagnoseUnsizedArrayPointerArithmetic(EvalInfo &Info, const Expr *E); | |||
438 | void diagnosePointerArithmetic(EvalInfo &Info, const Expr *E, | |||
439 | const APSInt &N); | |||
440 | /// Add N to the address of this subobject. | |||
441 | void adjustIndex(EvalInfo &Info, const Expr *E, APSInt N) { | |||
442 | if (Invalid || !N) return; | |||
443 | uint64_t TruncatedN = N.extOrTrunc(64).getZExtValue(); | |||
444 | if (isMostDerivedAnUnsizedArray()) { | |||
445 | diagnoseUnsizedArrayPointerArithmetic(Info, E); | |||
446 | // Can't verify -- trust that the user is doing the right thing (or if | |||
447 | // not, trust that the caller will catch the bad behavior). | |||
448 | // FIXME: Should we reject if this overflows, at least? | |||
449 | Entries.back() = PathEntry::ArrayIndex( | |||
450 | Entries.back().getAsArrayIndex() + TruncatedN); | |||
451 | return; | |||
452 | } | |||
453 | ||||
454 | // [expr.add]p4: For the purposes of these operators, a pointer to a | |||
455 | // nonarray object behaves the same as a pointer to the first element of | |||
456 | // an array of length one with the type of the object as its element type. | |||
457 | bool IsArray = MostDerivedPathLength == Entries.size() && | |||
458 | MostDerivedIsArrayElement; | |||
459 | uint64_t ArrayIndex = IsArray ? Entries.back().getAsArrayIndex() | |||
460 | : (uint64_t)IsOnePastTheEnd; | |||
461 | uint64_t ArraySize = | |||
462 | IsArray ? getMostDerivedArraySize() : (uint64_t)1; | |||
463 | ||||
464 | if (N < -(int64_t)ArrayIndex || N > ArraySize - ArrayIndex) { | |||
465 | // Calculate the actual index in a wide enough type, so we can include | |||
466 | // it in the note. | |||
467 | N = N.extend(std::max<unsigned>(N.getBitWidth() + 1, 65)); | |||
468 | (llvm::APInt&)N += ArrayIndex; | |||
469 | assert(N.ugt(ArraySize) && "bounds check failed for in-bounds index")(static_cast <bool> (N.ugt(ArraySize) && "bounds check failed for in-bounds index" ) ? void (0) : __assert_fail ("N.ugt(ArraySize) && \"bounds check failed for in-bounds index\"" , "clang/lib/AST/ExprConstant.cpp", 469, __extension__ __PRETTY_FUNCTION__ )); | |||
470 | diagnosePointerArithmetic(Info, E, N); | |||
471 | setInvalid(); | |||
472 | return; | |||
473 | } | |||
474 | ||||
475 | ArrayIndex += TruncatedN; | |||
476 | assert(ArrayIndex <= ArraySize &&(static_cast <bool> (ArrayIndex <= ArraySize && "bounds check succeeded for out-of-bounds index") ? void (0) : __assert_fail ("ArrayIndex <= ArraySize && \"bounds check succeeded for out-of-bounds index\"" , "clang/lib/AST/ExprConstant.cpp", 477, __extension__ __PRETTY_FUNCTION__ )) | |||
477 | "bounds check succeeded for out-of-bounds index")(static_cast <bool> (ArrayIndex <= ArraySize && "bounds check succeeded for out-of-bounds index") ? void (0) : __assert_fail ("ArrayIndex <= ArraySize && \"bounds check succeeded for out-of-bounds index\"" , "clang/lib/AST/ExprConstant.cpp", 477, __extension__ __PRETTY_FUNCTION__ )); | |||
478 | ||||
479 | if (IsArray) | |||
480 | Entries.back() = PathEntry::ArrayIndex(ArrayIndex); | |||
481 | else | |||
482 | IsOnePastTheEnd = (ArrayIndex != 0); | |||
483 | } | |||
484 | }; | |||
485 | ||||
486 | /// A scope at the end of which an object can need to be destroyed. | |||
487 | enum class ScopeKind { | |||
488 | Block, | |||
489 | FullExpression, | |||
490 | Call | |||
491 | }; | |||
492 | ||||
493 | /// A reference to a particular call and its arguments. | |||
494 | struct CallRef { | |||
495 | CallRef() : OrigCallee(), CallIndex(0), Version() {} | |||
496 | CallRef(const FunctionDecl *Callee, unsigned CallIndex, unsigned Version) | |||
497 | : OrigCallee(Callee), CallIndex(CallIndex), Version(Version) {} | |||
498 | ||||
499 | explicit operator bool() const { return OrigCallee; } | |||
500 | ||||
501 | /// Get the parameter that the caller initialized, corresponding to the | |||
502 | /// given parameter in the callee. | |||
503 | const ParmVarDecl *getOrigParam(const ParmVarDecl *PVD) const { | |||
504 | return OrigCallee ? OrigCallee->getParamDecl(PVD->getFunctionScopeIndex()) | |||
505 | : PVD; | |||
506 | } | |||
507 | ||||
508 | /// The callee at the point where the arguments were evaluated. This might | |||
509 | /// be different from the actual callee (a different redeclaration, or a | |||
510 | /// virtual override), but this function's parameters are the ones that | |||
511 | /// appear in the parameter map. | |||
512 | const FunctionDecl *OrigCallee; | |||
513 | /// The call index of the frame that holds the argument values. | |||
514 | unsigned CallIndex; | |||
515 | /// The version of the parameters corresponding to this call. | |||
516 | unsigned Version; | |||
517 | }; | |||
518 | ||||
519 | /// A stack frame in the constexpr call stack. | |||
520 | class CallStackFrame : public interp::Frame { | |||
521 | public: | |||
522 | EvalInfo &Info; | |||
523 | ||||
524 | /// Parent - The caller of this stack frame. | |||
525 | CallStackFrame *Caller; | |||
526 | ||||
527 | /// Callee - The function which was called. | |||
528 | const FunctionDecl *Callee; | |||
529 | ||||
530 | /// This - The binding for the this pointer in this call, if any. | |||
531 | const LValue *This; | |||
532 | ||||
533 | /// Information on how to find the arguments to this call. Our arguments | |||
534 | /// are stored in our parent's CallStackFrame, using the ParmVarDecl* as a | |||
535 | /// key and this value as the version. | |||
536 | CallRef Arguments; | |||
537 | ||||
538 | /// Source location information about the default argument or default | |||
539 | /// initializer expression we're evaluating, if any. | |||
540 | CurrentSourceLocExprScope CurSourceLocExprScope; | |||
541 | ||||
542 | // Note that we intentionally use std::map here so that references to | |||
543 | // values are stable. | |||
544 | typedef std::pair<const void *, unsigned> MapKeyTy; | |||
545 | typedef std::map<MapKeyTy, APValue> MapTy; | |||
546 | /// Temporaries - Temporary lvalues materialized within this stack frame. | |||
547 | MapTy Temporaries; | |||
548 | ||||
549 | /// CallLoc - The location of the call expression for this call. | |||
550 | SourceLocation CallLoc; | |||
551 | ||||
552 | /// Index - The call index of this call. | |||
553 | unsigned Index; | |||
554 | ||||
555 | /// The stack of integers for tracking version numbers for temporaries. | |||
556 | SmallVector<unsigned, 2> TempVersionStack = {1}; | |||
557 | unsigned CurTempVersion = TempVersionStack.back(); | |||
558 | ||||
559 | unsigned getTempVersion() const { return TempVersionStack.back(); } | |||
560 | ||||
561 | void pushTempVersion() { | |||
562 | TempVersionStack.push_back(++CurTempVersion); | |||
563 | } | |||
564 | ||||
565 | void popTempVersion() { | |||
566 | TempVersionStack.pop_back(); | |||
567 | } | |||
568 | ||||
569 | CallRef createCall(const FunctionDecl *Callee) { | |||
570 | return {Callee, Index, ++CurTempVersion}; | |||
571 | } | |||
572 | ||||
573 | // FIXME: Adding this to every 'CallStackFrame' may have a nontrivial impact | |||
574 | // on the overall stack usage of deeply-recursing constexpr evaluations. | |||
575 | // (We should cache this map rather than recomputing it repeatedly.) | |||
576 | // But let's try this and see how it goes; we can look into caching the map | |||
577 | // as a later change. | |||
578 | ||||
579 | /// LambdaCaptureFields - Mapping from captured variables/this to | |||
580 | /// corresponding data members in the closure class. | |||
581 | llvm::DenseMap<const VarDecl *, FieldDecl *> LambdaCaptureFields; | |||
582 | FieldDecl *LambdaThisCaptureField; | |||
583 | ||||
584 | CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, | |||
585 | const FunctionDecl *Callee, const LValue *This, | |||
586 | CallRef Arguments); | |||
587 | ~CallStackFrame(); | |||
588 | ||||
589 | // Return the temporary for Key whose version number is Version. | |||
590 | APValue *getTemporary(const void *Key, unsigned Version) { | |||
591 | MapKeyTy KV(Key, Version); | |||
592 | auto LB = Temporaries.lower_bound(KV); | |||
593 | if (LB != Temporaries.end() && LB->first == KV) | |||
594 | return &LB->second; | |||
595 | // Pair (Key,Version) wasn't found in the map. Check that no elements | |||
596 | // in the map have 'Key' as their key. | |||
597 | assert((LB == Temporaries.end() || LB->first.first != Key) &&(static_cast <bool> ((LB == Temporaries.end() || LB-> first.first != Key) && (LB == Temporaries.begin() || std ::prev(LB)->first.first != Key) && "Element with key 'Key' found in map" ) ? 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\"" , "clang/lib/AST/ExprConstant.cpp", 599, __extension__ __PRETTY_FUNCTION__ )) | |||
598 | (LB == Temporaries.begin() || std::prev(LB)->first.first != Key) &&(static_cast <bool> ((LB == Temporaries.end() || LB-> first.first != Key) && (LB == Temporaries.begin() || std ::prev(LB)->first.first != Key) && "Element with key 'Key' found in map" ) ? 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\"" , "clang/lib/AST/ExprConstant.cpp", 599, __extension__ __PRETTY_FUNCTION__ )) | |||
599 | "Element with key 'Key' found in map")(static_cast <bool> ((LB == Temporaries.end() || LB-> first.first != Key) && (LB == Temporaries.begin() || std ::prev(LB)->first.first != Key) && "Element with key 'Key' found in map" ) ? 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\"" , "clang/lib/AST/ExprConstant.cpp", 599, __extension__ __PRETTY_FUNCTION__ )); | |||
600 | return nullptr; | |||
601 | } | |||
602 | ||||
603 | // Return the current temporary for Key in the map. | |||
604 | APValue *getCurrentTemporary(const void *Key) { | |||
605 | auto UB = Temporaries.upper_bound(MapKeyTy(Key, UINT_MAX(2147483647 *2U +1U))); | |||
606 | if (UB != Temporaries.begin() && std::prev(UB)->first.first == Key) | |||
607 | return &std::prev(UB)->second; | |||
608 | return nullptr; | |||
609 | } | |||
610 | ||||
611 | // Return the version number of the current temporary for Key. | |||
612 | unsigned getCurrentTemporaryVersion(const void *Key) const { | |||
613 | auto UB = Temporaries.upper_bound(MapKeyTy(Key, UINT_MAX(2147483647 *2U +1U))); | |||
614 | if (UB != Temporaries.begin() && std::prev(UB)->first.first == Key) | |||
615 | return std::prev(UB)->first.second; | |||
616 | return 0; | |||
617 | } | |||
618 | ||||
619 | /// Allocate storage for an object of type T in this stack frame. | |||
620 | /// Populates LV with a handle to the created object. Key identifies | |||
621 | /// the temporary within the stack frame, and must not be reused without | |||
622 | /// bumping the temporary version number. | |||
623 | template<typename KeyT> | |||
624 | APValue &createTemporary(const KeyT *Key, QualType T, | |||
625 | ScopeKind Scope, LValue &LV); | |||
626 | ||||
627 | /// Allocate storage for a parameter of a function call made in this frame. | |||
628 | APValue &createParam(CallRef Args, const ParmVarDecl *PVD, LValue &LV); | |||
629 | ||||
630 | void describe(llvm::raw_ostream &OS) override; | |||
631 | ||||
632 | Frame *getCaller() const override { return Caller; } | |||
633 | SourceLocation getCallLocation() const override { return CallLoc; } | |||
634 | const FunctionDecl *getCallee() const override { return Callee; } | |||
635 | ||||
636 | bool isStdFunction() const { | |||
637 | for (const DeclContext *DC = Callee; DC; DC = DC->getParent()) | |||
638 | if (DC->isStdNamespace()) | |||
639 | return true; | |||
640 | return false; | |||
641 | } | |||
642 | ||||
643 | private: | |||
644 | APValue &createLocal(APValue::LValueBase Base, const void *Key, QualType T, | |||
645 | ScopeKind Scope); | |||
646 | }; | |||
647 | ||||
648 | /// Temporarily override 'this'. | |||
649 | class ThisOverrideRAII { | |||
650 | public: | |||
651 | ThisOverrideRAII(CallStackFrame &Frame, const LValue *NewThis, bool Enable) | |||
652 | : Frame(Frame), OldThis(Frame.This) { | |||
653 | if (Enable) | |||
654 | Frame.This = NewThis; | |||
655 | } | |||
656 | ~ThisOverrideRAII() { | |||
657 | Frame.This = OldThis; | |||
658 | } | |||
659 | private: | |||
660 | CallStackFrame &Frame; | |||
661 | const LValue *OldThis; | |||
662 | }; | |||
663 | } | |||
664 | ||||
665 | static bool HandleDestruction(EvalInfo &Info, const Expr *E, | |||
666 | const LValue &This, QualType ThisType); | |||
667 | static bool HandleDestruction(EvalInfo &Info, SourceLocation Loc, | |||
668 | APValue::LValueBase LVBase, APValue &Value, | |||
669 | QualType T); | |||
670 | ||||
671 | namespace { | |||
672 | /// A cleanup, and a flag indicating whether it is lifetime-extended. | |||
673 | class Cleanup { | |||
674 | llvm::PointerIntPair<APValue*, 2, ScopeKind> Value; | |||
675 | APValue::LValueBase Base; | |||
676 | QualType T; | |||
677 | ||||
678 | public: | |||
679 | Cleanup(APValue *Val, APValue::LValueBase Base, QualType T, | |||
680 | ScopeKind Scope) | |||
681 | : Value(Val, Scope), Base(Base), T(T) {} | |||
682 | ||||
683 | /// Determine whether this cleanup should be performed at the end of the | |||
684 | /// given kind of scope. | |||
685 | bool isDestroyedAtEndOf(ScopeKind K) const { | |||
686 | return (int)Value.getInt() >= (int)K; | |||
687 | } | |||
688 | bool endLifetime(EvalInfo &Info, bool RunDestructors) { | |||
689 | if (RunDestructors) { | |||
690 | SourceLocation Loc; | |||
691 | if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) | |||
692 | Loc = VD->getLocation(); | |||
693 | else if (const Expr *E = Base.dyn_cast<const Expr*>()) | |||
694 | Loc = E->getExprLoc(); | |||
695 | return HandleDestruction(Info, Loc, Base, *Value.getPointer(), T); | |||
696 | } | |||
697 | *Value.getPointer() = APValue(); | |||
698 | return true; | |||
699 | } | |||
700 | ||||
701 | bool hasSideEffect() { | |||
702 | return T.isDestructedType(); | |||
703 | } | |||
704 | }; | |||
705 | ||||
706 | /// A reference to an object whose construction we are currently evaluating. | |||
707 | struct ObjectUnderConstruction { | |||
708 | APValue::LValueBase Base; | |||
709 | ArrayRef<APValue::LValuePathEntry> Path; | |||
710 | friend bool operator==(const ObjectUnderConstruction &LHS, | |||
711 | const ObjectUnderConstruction &RHS) { | |||
712 | return LHS.Base == RHS.Base && LHS.Path == RHS.Path; | |||
713 | } | |||
714 | friend llvm::hash_code hash_value(const ObjectUnderConstruction &Obj) { | |||
715 | return llvm::hash_combine(Obj.Base, Obj.Path); | |||
716 | } | |||
717 | }; | |||
718 | enum class ConstructionPhase { | |||
719 | None, | |||
720 | Bases, | |||
721 | AfterBases, | |||
722 | AfterFields, | |||
723 | Destroying, | |||
724 | DestroyingBases | |||
725 | }; | |||
726 | } | |||
727 | ||||
728 | namespace llvm { | |||
729 | template<> struct DenseMapInfo<ObjectUnderConstruction> { | |||
730 | using Base = DenseMapInfo<APValue::LValueBase>; | |||
731 | static ObjectUnderConstruction getEmptyKey() { | |||
732 | return {Base::getEmptyKey(), {}}; } | |||
733 | static ObjectUnderConstruction getTombstoneKey() { | |||
734 | return {Base::getTombstoneKey(), {}}; | |||
735 | } | |||
736 | static unsigned getHashValue(const ObjectUnderConstruction &Object) { | |||
737 | return hash_value(Object); | |||
738 | } | |||
739 | static bool isEqual(const ObjectUnderConstruction &LHS, | |||
740 | const ObjectUnderConstruction &RHS) { | |||
741 | return LHS == RHS; | |||
742 | } | |||
743 | }; | |||
744 | } | |||
745 | ||||
746 | namespace { | |||
747 | /// A dynamically-allocated heap object. | |||
748 | struct DynAlloc { | |||
749 | /// The value of this heap-allocated object. | |||
750 | APValue Value; | |||
751 | /// The allocating expression; used for diagnostics. Either a CXXNewExpr | |||
752 | /// or a CallExpr (the latter is for direct calls to operator new inside | |||
753 | /// std::allocator<T>::allocate). | |||
754 | const Expr *AllocExpr = nullptr; | |||
755 | ||||
756 | enum Kind { | |||
757 | New, | |||
758 | ArrayNew, | |||
759 | StdAllocator | |||
760 | }; | |||
761 | ||||
762 | /// Get the kind of the allocation. This must match between allocation | |||
763 | /// and deallocation. | |||
764 | Kind getKind() const { | |||
765 | if (auto *NE = dyn_cast<CXXNewExpr>(AllocExpr)) | |||
766 | return NE->isArray() ? ArrayNew : New; | |||
767 | assert(isa<CallExpr>(AllocExpr))(static_cast <bool> (isa<CallExpr>(AllocExpr)) ? void (0) : __assert_fail ("isa<CallExpr>(AllocExpr)", "clang/lib/AST/ExprConstant.cpp" , 767, __extension__ __PRETTY_FUNCTION__)); | |||
768 | return StdAllocator; | |||
769 | } | |||
770 | }; | |||
771 | ||||
772 | struct DynAllocOrder { | |||
773 | bool operator()(DynamicAllocLValue L, DynamicAllocLValue R) const { | |||
774 | return L.getIndex() < R.getIndex(); | |||
775 | } | |||
776 | }; | |||
777 | ||||
778 | /// EvalInfo - This is a private struct used by the evaluator to capture | |||
779 | /// information about a subexpression as it is folded. It retains information | |||
780 | /// about the AST context, but also maintains information about the folded | |||
781 | /// expression. | |||
782 | /// | |||
783 | /// If an expression could be evaluated, it is still possible it is not a C | |||
784 | /// "integer constant expression" or constant expression. If not, this struct | |||
785 | /// captures information about how and why not. | |||
786 | /// | |||
787 | /// One bit of information passed *into* the request for constant folding | |||
788 | /// indicates whether the subexpression is "evaluated" or not according to C | |||
789 | /// rules. For example, the RHS of (0 && foo()) is not evaluated. We can | |||
790 | /// evaluate the expression regardless of what the RHS is, but C only allows | |||
791 | /// certain things in certain situations. | |||
792 | class EvalInfo : public interp::State { | |||
793 | public: | |||
794 | ASTContext &Ctx; | |||
795 | ||||
796 | /// EvalStatus - Contains information about the evaluation. | |||
797 | Expr::EvalStatus &EvalStatus; | |||
798 | ||||
799 | /// CurrentCall - The top of the constexpr call stack. | |||
800 | CallStackFrame *CurrentCall; | |||
801 | ||||
802 | /// CallStackDepth - The number of calls in the call stack right now. | |||
803 | unsigned CallStackDepth; | |||
804 | ||||
805 | /// NextCallIndex - The next call index to assign. | |||
806 | unsigned NextCallIndex; | |||
807 | ||||
808 | /// StepsLeft - The remaining number of evaluation steps we're permitted | |||
809 | /// to perform. This is essentially a limit for the number of statements | |||
810 | /// we will evaluate. | |||
811 | unsigned StepsLeft; | |||
812 | ||||
813 | /// Enable the experimental new constant interpreter. If an expression is | |||
814 | /// not supported by the interpreter, an error is triggered. | |||
815 | bool EnableNewConstInterp; | |||
816 | ||||
817 | /// BottomFrame - The frame in which evaluation started. This must be | |||
818 | /// initialized after CurrentCall and CallStackDepth. | |||
819 | CallStackFrame BottomFrame; | |||
820 | ||||
821 | /// A stack of values whose lifetimes end at the end of some surrounding | |||
822 | /// evaluation frame. | |||
823 | llvm::SmallVector<Cleanup, 16> CleanupStack; | |||
824 | ||||
825 | /// EvaluatingDecl - This is the declaration whose initializer is being | |||
826 | /// evaluated, if any. | |||
827 | APValue::LValueBase EvaluatingDecl; | |||
828 | ||||
829 | enum class EvaluatingDeclKind { | |||
830 | None, | |||
831 | /// We're evaluating the construction of EvaluatingDecl. | |||
832 | Ctor, | |||
833 | /// We're evaluating the destruction of EvaluatingDecl. | |||
834 | Dtor, | |||
835 | }; | |||
836 | EvaluatingDeclKind IsEvaluatingDecl = EvaluatingDeclKind::None; | |||
837 | ||||
838 | /// EvaluatingDeclValue - This is the value being constructed for the | |||
839 | /// declaration whose initializer is being evaluated, if any. | |||
840 | APValue *EvaluatingDeclValue; | |||
841 | ||||
842 | /// Set of objects that are currently being constructed. | |||
843 | llvm::DenseMap<ObjectUnderConstruction, ConstructionPhase> | |||
844 | ObjectsUnderConstruction; | |||
845 | ||||
846 | /// Current heap allocations, along with the location where each was | |||
847 | /// allocated. We use std::map here because we need stable addresses | |||
848 | /// for the stored APValues. | |||
849 | std::map<DynamicAllocLValue, DynAlloc, DynAllocOrder> HeapAllocs; | |||
850 | ||||
851 | /// The number of heap allocations performed so far in this evaluation. | |||
852 | unsigned NumHeapAllocs = 0; | |||
853 | ||||
854 | struct EvaluatingConstructorRAII { | |||
855 | EvalInfo &EI; | |||
856 | ObjectUnderConstruction Object; | |||
857 | bool DidInsert; | |||
858 | EvaluatingConstructorRAII(EvalInfo &EI, ObjectUnderConstruction Object, | |||
859 | bool HasBases) | |||
860 | : EI(EI), Object(Object) { | |||
861 | DidInsert = | |||
862 | EI.ObjectsUnderConstruction | |||
863 | .insert({Object, HasBases ? ConstructionPhase::Bases | |||
864 | : ConstructionPhase::AfterBases}) | |||
865 | .second; | |||
866 | } | |||
867 | void finishedConstructingBases() { | |||
868 | EI.ObjectsUnderConstruction[Object] = ConstructionPhase::AfterBases; | |||
869 | } | |||
870 | void finishedConstructingFields() { | |||
871 | EI.ObjectsUnderConstruction[Object] = ConstructionPhase::AfterFields; | |||
872 | } | |||
873 | ~EvaluatingConstructorRAII() { | |||
874 | if (DidInsert) EI.ObjectsUnderConstruction.erase(Object); | |||
875 | } | |||
876 | }; | |||
877 | ||||
878 | struct EvaluatingDestructorRAII { | |||
879 | EvalInfo &EI; | |||
880 | ObjectUnderConstruction Object; | |||
881 | bool DidInsert; | |||
882 | EvaluatingDestructorRAII(EvalInfo &EI, ObjectUnderConstruction Object) | |||
883 | : EI(EI), Object(Object) { | |||
884 | DidInsert = EI.ObjectsUnderConstruction | |||
885 | .insert({Object, ConstructionPhase::Destroying}) | |||
886 | .second; | |||
887 | } | |||
888 | void startedDestroyingBases() { | |||
889 | EI.ObjectsUnderConstruction[Object] = | |||
890 | ConstructionPhase::DestroyingBases; | |||
891 | } | |||
892 | ~EvaluatingDestructorRAII() { | |||
893 | if (DidInsert) | |||
894 | EI.ObjectsUnderConstruction.erase(Object); | |||
895 | } | |||
896 | }; | |||
897 | ||||
898 | ConstructionPhase | |||
899 | isEvaluatingCtorDtor(APValue::LValueBase Base, | |||
900 | ArrayRef<APValue::LValuePathEntry> Path) { | |||
901 | return ObjectsUnderConstruction.lookup({Base, Path}); | |||
902 | } | |||
903 | ||||
904 | /// If we're currently speculatively evaluating, the outermost call stack | |||
905 | /// depth at which we can mutate state, otherwise 0. | |||
906 | unsigned SpeculativeEvaluationDepth = 0; | |||
907 | ||||
908 | /// The current array initialization index, if we're performing array | |||
909 | /// initialization. | |||
910 | uint64_t ArrayInitIndex = -1; | |||
911 | ||||
912 | /// HasActiveDiagnostic - Was the previous diagnostic stored? If so, further | |||
913 | /// notes attached to it will also be stored, otherwise they will not be. | |||
914 | bool HasActiveDiagnostic; | |||
915 | ||||
916 | /// Have we emitted a diagnostic explaining why we couldn't constant | |||
917 | /// fold (not just why it's not strictly a constant expression)? | |||
918 | bool HasFoldFailureDiagnostic; | |||
919 | ||||
920 | /// Whether or not we're in a context where the front end requires a | |||
921 | /// constant value. | |||
922 | bool InConstantContext; | |||
923 | ||||
924 | /// Whether we're checking that an expression is a potential constant | |||
925 | /// expression. If so, do not fail on constructs that could become constant | |||
926 | /// later on (such as a use of an undefined global). | |||
927 | bool CheckingPotentialConstantExpression = false; | |||
928 | ||||
929 | /// Whether we're checking for an expression that has undefined behavior. | |||
930 | /// If so, we will produce warnings if we encounter an operation that is | |||
931 | /// always undefined. | |||
932 | /// | |||
933 | /// Note that we still need to evaluate the expression normally when this | |||
934 | /// is set; this is used when evaluating ICEs in C. | |||
935 | bool CheckingForUndefinedBehavior = false; | |||
936 | ||||
937 | enum EvaluationMode { | |||
938 | /// Evaluate as a constant expression. Stop if we find that the expression | |||
939 | /// is not a constant expression. | |||
940 | EM_ConstantExpression, | |||
941 | ||||
942 | /// Evaluate as a constant expression. Stop if we find that the expression | |||
943 | /// is not a constant expression. Some expressions can be retried in the | |||
944 | /// optimizer if we don't constant fold them here, but in an unevaluated | |||
945 | /// context we try to fold them immediately since the optimizer never | |||
946 | /// gets a chance to look at it. | |||
947 | EM_ConstantExpressionUnevaluated, | |||
948 | ||||
949 | /// Fold the expression to a constant. Stop if we hit a side-effect that | |||
950 | /// we can't model. | |||
951 | EM_ConstantFold, | |||
952 | ||||
953 | /// Evaluate in any way we know how. Don't worry about side-effects that | |||
954 | /// can't be modeled. | |||
955 | EM_IgnoreSideEffects, | |||
956 | } EvalMode; | |||
957 | ||||
958 | /// Are we checking whether the expression is a potential constant | |||
959 | /// expression? | |||
960 | bool checkingPotentialConstantExpression() const override { | |||
961 | return CheckingPotentialConstantExpression; | |||
962 | } | |||
963 | ||||
964 | /// Are we checking an expression for overflow? | |||
965 | // FIXME: We should check for any kind of undefined or suspicious behavior | |||
966 | // in such constructs, not just overflow. | |||
967 | bool checkingForUndefinedBehavior() const override { | |||
968 | return CheckingForUndefinedBehavior; | |||
969 | } | |||
970 | ||||
971 | EvalInfo(const ASTContext &C, Expr::EvalStatus &S, EvaluationMode Mode) | |||
972 | : Ctx(const_cast<ASTContext &>(C)), EvalStatus(S), CurrentCall(nullptr), | |||
973 | CallStackDepth(0), NextCallIndex(1), | |||
974 | StepsLeft(C.getLangOpts().ConstexprStepLimit), | |||
975 | EnableNewConstInterp(C.getLangOpts().EnableNewConstInterp), | |||
976 | BottomFrame(*this, SourceLocation(), nullptr, nullptr, CallRef()), | |||
977 | EvaluatingDecl((const ValueDecl *)nullptr), | |||
978 | EvaluatingDeclValue(nullptr), HasActiveDiagnostic(false), | |||
979 | HasFoldFailureDiagnostic(false), InConstantContext(false), | |||
980 | EvalMode(Mode) {} | |||
981 | ||||
982 | ~EvalInfo() { | |||
983 | discardCleanups(); | |||
984 | } | |||
985 | ||||
986 | ASTContext &getCtx() const override { return Ctx; } | |||
987 | ||||
988 | void setEvaluatingDecl(APValue::LValueBase Base, APValue &Value, | |||
989 | EvaluatingDeclKind EDK = EvaluatingDeclKind::Ctor) { | |||
990 | EvaluatingDecl = Base; | |||
991 | IsEvaluatingDecl = EDK; | |||
992 | EvaluatingDeclValue = &Value; | |||
993 | } | |||
994 | ||||
995 | bool CheckCallLimit(SourceLocation Loc) { | |||
996 | // Don't perform any constexpr calls (other than the call we're checking) | |||
997 | // when checking a potential constant expression. | |||
998 | if (checkingPotentialConstantExpression() && CallStackDepth > 1) | |||
999 | return false; | |||
1000 | if (NextCallIndex == 0) { | |||
1001 | // NextCallIndex has wrapped around. | |||
1002 | FFDiag(Loc, diag::note_constexpr_call_limit_exceeded); | |||
1003 | return false; | |||
1004 | } | |||
1005 | if (CallStackDepth <= getLangOpts().ConstexprCallDepth) | |||
1006 | return true; | |||
1007 | FFDiag(Loc, diag::note_constexpr_depth_limit_exceeded) | |||
1008 | << getLangOpts().ConstexprCallDepth; | |||
1009 | return false; | |||
1010 | } | |||
1011 | ||||
1012 | std::pair<CallStackFrame *, unsigned> | |||
1013 | getCallFrameAndDepth(unsigned CallIndex) { | |||
1014 | assert(CallIndex && "no call index in getCallFrameAndDepth")(static_cast <bool> (CallIndex && "no call index in getCallFrameAndDepth" ) ? void (0) : __assert_fail ("CallIndex && \"no call index in getCallFrameAndDepth\"" , "clang/lib/AST/ExprConstant.cpp", 1014, __extension__ __PRETTY_FUNCTION__ )); | |||
1015 | // We will eventually hit BottomFrame, which has Index 1, so Frame can't | |||
1016 | // be null in this loop. | |||
1017 | unsigned Depth = CallStackDepth; | |||
1018 | CallStackFrame *Frame = CurrentCall; | |||
1019 | while (Frame->Index > CallIndex) { | |||
1020 | Frame = Frame->Caller; | |||
1021 | --Depth; | |||
1022 | } | |||
1023 | if (Frame->Index == CallIndex) | |||
1024 | return {Frame, Depth}; | |||
1025 | return {nullptr, 0}; | |||
1026 | } | |||
1027 | ||||
1028 | bool nextStep(const Stmt *S) { | |||
1029 | if (!StepsLeft) { | |||
1030 | FFDiag(S->getBeginLoc(), diag::note_constexpr_step_limit_exceeded); | |||
1031 | return false; | |||
1032 | } | |||
1033 | --StepsLeft; | |||
1034 | return true; | |||
1035 | } | |||
1036 | ||||
1037 | APValue *createHeapAlloc(const Expr *E, QualType T, LValue &LV); | |||
1038 | ||||
1039 | Optional<DynAlloc*> lookupDynamicAlloc(DynamicAllocLValue DA) { | |||
1040 | Optional<DynAlloc*> Result; | |||
1041 | auto It = HeapAllocs.find(DA); | |||
1042 | if (It != HeapAllocs.end()) | |||
1043 | Result = &It->second; | |||
1044 | return Result; | |||
1045 | } | |||
1046 | ||||
1047 | /// Get the allocated storage for the given parameter of the given call. | |||
1048 | APValue *getParamSlot(CallRef Call, const ParmVarDecl *PVD) { | |||
1049 | CallStackFrame *Frame = getCallFrameAndDepth(Call.CallIndex).first; | |||
1050 | return Frame ? Frame->getTemporary(Call.getOrigParam(PVD), Call.Version) | |||
1051 | : nullptr; | |||
1052 | } | |||
1053 | ||||
1054 | /// Information about a stack frame for std::allocator<T>::[de]allocate. | |||
1055 | struct StdAllocatorCaller { | |||
1056 | unsigned FrameIndex; | |||
1057 | QualType ElemType; | |||
1058 | explicit operator bool() const { return FrameIndex != 0; }; | |||
1059 | }; | |||
1060 | ||||
1061 | StdAllocatorCaller getStdAllocatorCaller(StringRef FnName) const { | |||
1062 | for (const CallStackFrame *Call = CurrentCall; Call != &BottomFrame; | |||
1063 | Call = Call->Caller) { | |||
1064 | const auto *MD = dyn_cast_or_null<CXXMethodDecl>(Call->Callee); | |||
1065 | if (!MD) | |||
1066 | continue; | |||
1067 | const IdentifierInfo *FnII = MD->getIdentifier(); | |||
1068 | if (!FnII || !FnII->isStr(FnName)) | |||
1069 | continue; | |||
1070 | ||||
1071 | const auto *CTSD = | |||
1072 | dyn_cast<ClassTemplateSpecializationDecl>(MD->getParent()); | |||
1073 | if (!CTSD) | |||
1074 | continue; | |||
1075 | ||||
1076 | const IdentifierInfo *ClassII = CTSD->getIdentifier(); | |||
1077 | const TemplateArgumentList &TAL = CTSD->getTemplateArgs(); | |||
1078 | if (CTSD->isInStdNamespace() && ClassII && | |||
1079 | ClassII->isStr("allocator") && TAL.size() >= 1 && | |||
1080 | TAL[0].getKind() == TemplateArgument::Type) | |||
1081 | return {Call->Index, TAL[0].getAsType()}; | |||
1082 | } | |||
1083 | ||||
1084 | return {}; | |||
1085 | } | |||
1086 | ||||
1087 | void performLifetimeExtension() { | |||
1088 | // Disable the cleanups for lifetime-extended temporaries. | |||
1089 | llvm::erase_if(CleanupStack, [](Cleanup &C) { | |||
1090 | return !C.isDestroyedAtEndOf(ScopeKind::FullExpression); | |||
1091 | }); | |||
1092 | } | |||
1093 | ||||
1094 | /// Throw away any remaining cleanups at the end of evaluation. If any | |||
1095 | /// cleanups would have had a side-effect, note that as an unmodeled | |||
1096 | /// side-effect and return false. Otherwise, return true. | |||
1097 | bool discardCleanups() { | |||
1098 | for (Cleanup &C : CleanupStack) { | |||
1099 | if (C.hasSideEffect() && !noteSideEffect()) { | |||
1100 | CleanupStack.clear(); | |||
1101 | return false; | |||
1102 | } | |||
1103 | } | |||
1104 | CleanupStack.clear(); | |||
1105 | return true; | |||
1106 | } | |||
1107 | ||||
1108 | private: | |||
1109 | interp::Frame *getCurrentFrame() override { return CurrentCall; } | |||
1110 | const interp::Frame *getBottomFrame() const override { return &BottomFrame; } | |||
1111 | ||||
1112 | bool hasActiveDiagnostic() override { return HasActiveDiagnostic; } | |||
1113 | void setActiveDiagnostic(bool Flag) override { HasActiveDiagnostic = Flag; } | |||
1114 | ||||
1115 | void setFoldFailureDiagnostic(bool Flag) override { | |||
1116 | HasFoldFailureDiagnostic = Flag; | |||
1117 | } | |||
1118 | ||||
1119 | Expr::EvalStatus &getEvalStatus() const override { return EvalStatus; } | |||
1120 | ||||
1121 | // If we have a prior diagnostic, it will be noting that the expression | |||
1122 | // isn't a constant expression. This diagnostic is more important, | |||
1123 | // unless we require this evaluation to produce a constant expression. | |||
1124 | // | |||
1125 | // FIXME: We might want to show both diagnostics to the user in | |||
1126 | // EM_ConstantFold mode. | |||
1127 | bool hasPriorDiagnostic() override { | |||
1128 | if (!EvalStatus.Diag->empty()) { | |||
1129 | switch (EvalMode) { | |||
1130 | case EM_ConstantFold: | |||
1131 | case EM_IgnoreSideEffects: | |||
1132 | if (!HasFoldFailureDiagnostic) | |||
1133 | break; | |||
1134 | // We've already failed to fold something. Keep that diagnostic. | |||
1135 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
1136 | case EM_ConstantExpression: | |||
1137 | case EM_ConstantExpressionUnevaluated: | |||
1138 | setActiveDiagnostic(false); | |||
1139 | return true; | |||
1140 | } | |||
1141 | } | |||
1142 | return false; | |||
1143 | } | |||
1144 | ||||
1145 | unsigned getCallStackDepth() override { return CallStackDepth; } | |||
1146 | ||||
1147 | public: | |||
1148 | /// Should we continue evaluation after encountering a side-effect that we | |||
1149 | /// couldn't model? | |||
1150 | bool keepEvaluatingAfterSideEffect() { | |||
1151 | switch (EvalMode) { | |||
1152 | case EM_IgnoreSideEffects: | |||
1153 | return true; | |||
1154 | ||||
1155 | case EM_ConstantExpression: | |||
1156 | case EM_ConstantExpressionUnevaluated: | |||
1157 | case EM_ConstantFold: | |||
1158 | // By default, assume any side effect might be valid in some other | |||
1159 | // evaluation of this expression from a different context. | |||
1160 | return checkingPotentialConstantExpression() || | |||
1161 | checkingForUndefinedBehavior(); | |||
1162 | } | |||
1163 | llvm_unreachable("Missed EvalMode case")::llvm::llvm_unreachable_internal("Missed EvalMode case", "clang/lib/AST/ExprConstant.cpp" , 1163); | |||
1164 | } | |||
1165 | ||||
1166 | /// Note that we have had a side-effect, and determine whether we should | |||
1167 | /// keep evaluating. | |||
1168 | bool noteSideEffect() { | |||
1169 | EvalStatus.HasSideEffects = true; | |||
1170 | return keepEvaluatingAfterSideEffect(); | |||
1171 | } | |||
1172 | ||||
1173 | /// Should we continue evaluation after encountering undefined behavior? | |||
1174 | bool keepEvaluatingAfterUndefinedBehavior() { | |||
1175 | switch (EvalMode) { | |||
1176 | case EM_IgnoreSideEffects: | |||
1177 | case EM_ConstantFold: | |||
1178 | return true; | |||
1179 | ||||
1180 | case EM_ConstantExpression: | |||
1181 | case EM_ConstantExpressionUnevaluated: | |||
1182 | return checkingForUndefinedBehavior(); | |||
1183 | } | |||
1184 | llvm_unreachable("Missed EvalMode case")::llvm::llvm_unreachable_internal("Missed EvalMode case", "clang/lib/AST/ExprConstant.cpp" , 1184); | |||
1185 | } | |||
1186 | ||||
1187 | /// Note that we hit something that was technically undefined behavior, but | |||
1188 | /// that we can evaluate past it (such as signed overflow or floating-point | |||
1189 | /// division by zero.) | |||
1190 | bool noteUndefinedBehavior() override { | |||
1191 | EvalStatus.HasUndefinedBehavior = true; | |||
1192 | return keepEvaluatingAfterUndefinedBehavior(); | |||
1193 | } | |||
1194 | ||||
1195 | /// Should we continue evaluation as much as possible after encountering a | |||
1196 | /// construct which can't be reduced to a value? | |||
1197 | bool keepEvaluatingAfterFailure() const override { | |||
1198 | if (!StepsLeft) | |||
1199 | return false; | |||
1200 | ||||
1201 | switch (EvalMode) { | |||
1202 | case EM_ConstantExpression: | |||
1203 | case EM_ConstantExpressionUnevaluated: | |||
1204 | case EM_ConstantFold: | |||
1205 | case EM_IgnoreSideEffects: | |||
1206 | return checkingPotentialConstantExpression() || | |||
1207 | checkingForUndefinedBehavior(); | |||
1208 | } | |||
1209 | llvm_unreachable("Missed EvalMode case")::llvm::llvm_unreachable_internal("Missed EvalMode case", "clang/lib/AST/ExprConstant.cpp" , 1209); | |||
1210 | } | |||
1211 | ||||
1212 | /// Notes that we failed to evaluate an expression that other expressions | |||
1213 | /// directly depend on, and determine if we should keep evaluating. This | |||
1214 | /// should only be called if we actually intend to keep evaluating. | |||
1215 | /// | |||
1216 | /// Call noteSideEffect() instead if we may be able to ignore the value that | |||
1217 | /// we failed to evaluate, e.g. if we failed to evaluate Foo() in: | |||
1218 | /// | |||
1219 | /// (Foo(), 1) // use noteSideEffect | |||
1220 | /// (Foo() || true) // use noteSideEffect | |||
1221 | /// Foo() + 1 // use noteFailure | |||
1222 | LLVM_NODISCARD[[clang::warn_unused_result]] bool noteFailure() { | |||
1223 | // Failure when evaluating some expression often means there is some | |||
1224 | // subexpression whose evaluation was skipped. Therefore, (because we | |||
1225 | // don't track whether we skipped an expression when unwinding after an | |||
1226 | // evaluation failure) every evaluation failure that bubbles up from a | |||
1227 | // subexpression implies that a side-effect has potentially happened. We | |||
1228 | // skip setting the HasSideEffects flag to true until we decide to | |||
1229 | // continue evaluating after that point, which happens here. | |||
1230 | bool KeepGoing = keepEvaluatingAfterFailure(); | |||
1231 | EvalStatus.HasSideEffects |= KeepGoing; | |||
1232 | return KeepGoing; | |||
1233 | } | |||
1234 | ||||
1235 | class ArrayInitLoopIndex { | |||
1236 | EvalInfo &Info; | |||
1237 | uint64_t OuterIndex; | |||
1238 | ||||
1239 | public: | |||
1240 | ArrayInitLoopIndex(EvalInfo &Info) | |||
1241 | : Info(Info), OuterIndex(Info.ArrayInitIndex) { | |||
1242 | Info.ArrayInitIndex = 0; | |||
1243 | } | |||
1244 | ~ArrayInitLoopIndex() { Info.ArrayInitIndex = OuterIndex; } | |||
1245 | ||||
1246 | operator uint64_t&() { return Info.ArrayInitIndex; } | |||
1247 | }; | |||
1248 | }; | |||
1249 | ||||
1250 | /// Object used to treat all foldable expressions as constant expressions. | |||
1251 | struct FoldConstant { | |||
1252 | EvalInfo &Info; | |||
1253 | bool Enabled; | |||
1254 | bool HadNoPriorDiags; | |||
1255 | EvalInfo::EvaluationMode OldMode; | |||
1256 | ||||
1257 | explicit FoldConstant(EvalInfo &Info, bool Enabled) | |||
1258 | : Info(Info), | |||
1259 | Enabled(Enabled), | |||
1260 | HadNoPriorDiags(Info.EvalStatus.Diag && | |||
1261 | Info.EvalStatus.Diag->empty() && | |||
1262 | !Info.EvalStatus.HasSideEffects), | |||
1263 | OldMode(Info.EvalMode) { | |||
1264 | if (Enabled) | |||
1265 | Info.EvalMode = EvalInfo::EM_ConstantFold; | |||
1266 | } | |||
1267 | void keepDiagnostics() { Enabled = false; } | |||
1268 | ~FoldConstant() { | |||
1269 | if (Enabled && HadNoPriorDiags && !Info.EvalStatus.Diag->empty() && | |||
1270 | !Info.EvalStatus.HasSideEffects) | |||
1271 | Info.EvalStatus.Diag->clear(); | |||
1272 | Info.EvalMode = OldMode; | |||
1273 | } | |||
1274 | }; | |||
1275 | ||||
1276 | /// RAII object used to set the current evaluation mode to ignore | |||
1277 | /// side-effects. | |||
1278 | struct IgnoreSideEffectsRAII { | |||
1279 | EvalInfo &Info; | |||
1280 | EvalInfo::EvaluationMode OldMode; | |||
1281 | explicit IgnoreSideEffectsRAII(EvalInfo &Info) | |||
1282 | : Info(Info), OldMode(Info.EvalMode) { | |||
1283 | Info.EvalMode = EvalInfo::EM_IgnoreSideEffects; | |||
1284 | } | |||
1285 | ||||
1286 | ~IgnoreSideEffectsRAII() { Info.EvalMode = OldMode; } | |||
1287 | }; | |||
1288 | ||||
1289 | /// RAII object used to optionally suppress diagnostics and side-effects from | |||
1290 | /// a speculative evaluation. | |||
1291 | class SpeculativeEvaluationRAII { | |||
1292 | EvalInfo *Info = nullptr; | |||
1293 | Expr::EvalStatus OldStatus; | |||
1294 | unsigned OldSpeculativeEvaluationDepth; | |||
1295 | ||||
1296 | void moveFromAndCancel(SpeculativeEvaluationRAII &&Other) { | |||
1297 | Info = Other.Info; | |||
1298 | OldStatus = Other.OldStatus; | |||
1299 | OldSpeculativeEvaluationDepth = Other.OldSpeculativeEvaluationDepth; | |||
1300 | Other.Info = nullptr; | |||
1301 | } | |||
1302 | ||||
1303 | void maybeRestoreState() { | |||
1304 | if (!Info) | |||
1305 | return; | |||
1306 | ||||
1307 | Info->EvalStatus = OldStatus; | |||
1308 | Info->SpeculativeEvaluationDepth = OldSpeculativeEvaluationDepth; | |||
1309 | } | |||
1310 | ||||
1311 | public: | |||
1312 | SpeculativeEvaluationRAII() = default; | |||
1313 | ||||
1314 | SpeculativeEvaluationRAII( | |||
1315 | EvalInfo &Info, SmallVectorImpl<PartialDiagnosticAt> *NewDiag = nullptr) | |||
1316 | : Info(&Info), OldStatus(Info.EvalStatus), | |||
1317 | OldSpeculativeEvaluationDepth(Info.SpeculativeEvaluationDepth) { | |||
1318 | Info.EvalStatus.Diag = NewDiag; | |||
1319 | Info.SpeculativeEvaluationDepth = Info.CallStackDepth + 1; | |||
1320 | } | |||
1321 | ||||
1322 | SpeculativeEvaluationRAII(const SpeculativeEvaluationRAII &Other) = delete; | |||
1323 | SpeculativeEvaluationRAII(SpeculativeEvaluationRAII &&Other) { | |||
1324 | moveFromAndCancel(std::move(Other)); | |||
1325 | } | |||
1326 | ||||
1327 | SpeculativeEvaluationRAII &operator=(SpeculativeEvaluationRAII &&Other) { | |||
1328 | maybeRestoreState(); | |||
1329 | moveFromAndCancel(std::move(Other)); | |||
1330 | return *this; | |||
1331 | } | |||
1332 | ||||
1333 | ~SpeculativeEvaluationRAII() { maybeRestoreState(); } | |||
1334 | }; | |||
1335 | ||||
1336 | /// RAII object wrapping a full-expression or block scope, and handling | |||
1337 | /// the ending of the lifetime of temporaries created within it. | |||
1338 | template<ScopeKind Kind> | |||
1339 | class ScopeRAII { | |||
1340 | EvalInfo &Info; | |||
1341 | unsigned OldStackSize; | |||
1342 | public: | |||
1343 | ScopeRAII(EvalInfo &Info) | |||
1344 | : Info(Info), OldStackSize(Info.CleanupStack.size()) { | |||
1345 | // Push a new temporary version. This is needed to distinguish between | |||
1346 | // temporaries created in different iterations of a loop. | |||
1347 | Info.CurrentCall->pushTempVersion(); | |||
1348 | } | |||
1349 | bool destroy(bool RunDestructors = true) { | |||
1350 | bool OK = cleanup(Info, RunDestructors, OldStackSize); | |||
1351 | OldStackSize = -1U; | |||
1352 | return OK; | |||
1353 | } | |||
1354 | ~ScopeRAII() { | |||
1355 | if (OldStackSize != -1U) | |||
1356 | destroy(false); | |||
1357 | // Body moved to a static method to encourage the compiler to inline away | |||
1358 | // instances of this class. | |||
1359 | Info.CurrentCall->popTempVersion(); | |||
1360 | } | |||
1361 | private: | |||
1362 | static bool cleanup(EvalInfo &Info, bool RunDestructors, | |||
1363 | unsigned OldStackSize) { | |||
1364 | assert(OldStackSize <= Info.CleanupStack.size() &&(static_cast <bool> (OldStackSize <= Info.CleanupStack .size() && "running cleanups out of order?") ? void ( 0) : __assert_fail ("OldStackSize <= Info.CleanupStack.size() && \"running cleanups out of order?\"" , "clang/lib/AST/ExprConstant.cpp", 1365, __extension__ __PRETTY_FUNCTION__ )) | |||
1365 | "running cleanups out of order?")(static_cast <bool> (OldStackSize <= Info.CleanupStack .size() && "running cleanups out of order?") ? void ( 0) : __assert_fail ("OldStackSize <= Info.CleanupStack.size() && \"running cleanups out of order?\"" , "clang/lib/AST/ExprConstant.cpp", 1365, __extension__ __PRETTY_FUNCTION__ )); | |||
1366 | ||||
1367 | // Run all cleanups for a block scope, and non-lifetime-extended cleanups | |||
1368 | // for a full-expression scope. | |||
1369 | bool Success = true; | |||
1370 | for (unsigned I = Info.CleanupStack.size(); I > OldStackSize; --I) { | |||
1371 | if (Info.CleanupStack[I - 1].isDestroyedAtEndOf(Kind)) { | |||
1372 | if (!Info.CleanupStack[I - 1].endLifetime(Info, RunDestructors)) { | |||
1373 | Success = false; | |||
1374 | break; | |||
1375 | } | |||
1376 | } | |||
1377 | } | |||
1378 | ||||
1379 | // Compact any retained cleanups. | |||
1380 | auto NewEnd = Info.CleanupStack.begin() + OldStackSize; | |||
1381 | if (Kind != ScopeKind::Block) | |||
1382 | NewEnd = | |||
1383 | std::remove_if(NewEnd, Info.CleanupStack.end(), [](Cleanup &C) { | |||
1384 | return C.isDestroyedAtEndOf(Kind); | |||
1385 | }); | |||
1386 | Info.CleanupStack.erase(NewEnd, Info.CleanupStack.end()); | |||
1387 | return Success; | |||
1388 | } | |||
1389 | }; | |||
1390 | typedef ScopeRAII<ScopeKind::Block> BlockScopeRAII; | |||
1391 | typedef ScopeRAII<ScopeKind::FullExpression> FullExpressionRAII; | |||
1392 | typedef ScopeRAII<ScopeKind::Call> CallScopeRAII; | |||
1393 | } | |||
1394 | ||||
1395 | bool SubobjectDesignator::checkSubobject(EvalInfo &Info, const Expr *E, | |||
1396 | CheckSubobjectKind CSK) { | |||
1397 | if (Invalid) | |||
1398 | return false; | |||
1399 | if (isOnePastTheEnd()) { | |||
1400 | Info.CCEDiag(E, diag::note_constexpr_past_end_subobject) | |||
1401 | << CSK; | |||
1402 | setInvalid(); | |||
1403 | return false; | |||
1404 | } | |||
1405 | // Note, we do not diagnose if isMostDerivedAnUnsizedArray(), because there | |||
1406 | // must actually be at least one array element; even a VLA cannot have a | |||
1407 | // bound of zero. And if our index is nonzero, we already had a CCEDiag. | |||
1408 | return true; | |||
1409 | } | |||
1410 | ||||
1411 | void SubobjectDesignator::diagnoseUnsizedArrayPointerArithmetic(EvalInfo &Info, | |||
1412 | const Expr *E) { | |||
1413 | Info.CCEDiag(E, diag::note_constexpr_unsized_array_indexed); | |||
1414 | // Do not set the designator as invalid: we can represent this situation, | |||
1415 | // and correct handling of __builtin_object_size requires us to do so. | |||
1416 | } | |||
1417 | ||||
1418 | void SubobjectDesignator::diagnosePointerArithmetic(EvalInfo &Info, | |||
1419 | const Expr *E, | |||
1420 | const APSInt &N) { | |||
1421 | // If we're complaining, we must be able to statically determine the size of | |||
1422 | // the most derived array. | |||
1423 | if (MostDerivedPathLength == Entries.size() && MostDerivedIsArrayElement) | |||
1424 | Info.CCEDiag(E, diag::note_constexpr_array_index) | |||
1425 | << N << /*array*/ 0 | |||
1426 | << static_cast<unsigned>(getMostDerivedArraySize()); | |||
1427 | else | |||
1428 | Info.CCEDiag(E, diag::note_constexpr_array_index) | |||
1429 | << N << /*non-array*/ 1; | |||
1430 | setInvalid(); | |||
1431 | } | |||
1432 | ||||
1433 | CallStackFrame::CallStackFrame(EvalInfo &Info, SourceLocation CallLoc, | |||
1434 | const FunctionDecl *Callee, const LValue *This, | |||
1435 | CallRef Call) | |||
1436 | : Info(Info), Caller(Info.CurrentCall), Callee(Callee), This(This), | |||
1437 | Arguments(Call), CallLoc(CallLoc), Index(Info.NextCallIndex++) { | |||
1438 | Info.CurrentCall = this; | |||
1439 | ++Info.CallStackDepth; | |||
1440 | } | |||
1441 | ||||
1442 | CallStackFrame::~CallStackFrame() { | |||
1443 | assert(Info.CurrentCall == this && "calls retired out of order")(static_cast <bool> (Info.CurrentCall == this && "calls retired out of order") ? void (0) : __assert_fail ("Info.CurrentCall == this && \"calls retired out of order\"" , "clang/lib/AST/ExprConstant.cpp", 1443, __extension__ __PRETTY_FUNCTION__ )); | |||
1444 | --Info.CallStackDepth; | |||
1445 | Info.CurrentCall = Caller; | |||
1446 | } | |||
1447 | ||||
1448 | static bool isRead(AccessKinds AK) { | |||
1449 | return AK == AK_Read || AK == AK_ReadObjectRepresentation; | |||
1450 | } | |||
1451 | ||||
1452 | static bool isModification(AccessKinds AK) { | |||
1453 | switch (AK) { | |||
1454 | case AK_Read: | |||
1455 | case AK_ReadObjectRepresentation: | |||
1456 | case AK_MemberCall: | |||
1457 | case AK_DynamicCast: | |||
1458 | case AK_TypeId: | |||
1459 | return false; | |||
1460 | case AK_Assign: | |||
1461 | case AK_Increment: | |||
1462 | case AK_Decrement: | |||
1463 | case AK_Construct: | |||
1464 | case AK_Destroy: | |||
1465 | return true; | |||
1466 | } | |||
1467 | llvm_unreachable("unknown access kind")::llvm::llvm_unreachable_internal("unknown access kind", "clang/lib/AST/ExprConstant.cpp" , 1467); | |||
1468 | } | |||
1469 | ||||
1470 | static bool isAnyAccess(AccessKinds AK) { | |||
1471 | return isRead(AK) || isModification(AK); | |||
1472 | } | |||
1473 | ||||
1474 | /// Is this an access per the C++ definition? | |||
1475 | static bool isFormalAccess(AccessKinds AK) { | |||
1476 | return isAnyAccess(AK) && AK != AK_Construct && AK != AK_Destroy; | |||
1477 | } | |||
1478 | ||||
1479 | /// Is this kind of axcess valid on an indeterminate object value? | |||
1480 | static bool isValidIndeterminateAccess(AccessKinds AK) { | |||
1481 | switch (AK) { | |||
1482 | case AK_Read: | |||
1483 | case AK_Increment: | |||
1484 | case AK_Decrement: | |||
1485 | // These need the object's value. | |||
1486 | return false; | |||
1487 | ||||
1488 | case AK_ReadObjectRepresentation: | |||
1489 | case AK_Assign: | |||
1490 | case AK_Construct: | |||
1491 | case AK_Destroy: | |||
1492 | // Construction and destruction don't need the value. | |||
1493 | return true; | |||
1494 | ||||
1495 | case AK_MemberCall: | |||
1496 | case AK_DynamicCast: | |||
1497 | case AK_TypeId: | |||
1498 | // These aren't really meaningful on scalars. | |||
1499 | return true; | |||
1500 | } | |||
1501 | llvm_unreachable("unknown access kind")::llvm::llvm_unreachable_internal("unknown access kind", "clang/lib/AST/ExprConstant.cpp" , 1501); | |||
1502 | } | |||
1503 | ||||
1504 | namespace { | |||
1505 | struct ComplexValue { | |||
1506 | private: | |||
1507 | bool IsInt; | |||
1508 | ||||
1509 | public: | |||
1510 | APSInt IntReal, IntImag; | |||
1511 | APFloat FloatReal, FloatImag; | |||
1512 | ||||
1513 | ComplexValue() : FloatReal(APFloat::Bogus()), FloatImag(APFloat::Bogus()) {} | |||
1514 | ||||
1515 | void makeComplexFloat() { IsInt = false; } | |||
1516 | bool isComplexFloat() const { return !IsInt; } | |||
1517 | APFloat &getComplexFloatReal() { return FloatReal; } | |||
1518 | APFloat &getComplexFloatImag() { return FloatImag; } | |||
1519 | ||||
1520 | void makeComplexInt() { IsInt = true; } | |||
1521 | bool isComplexInt() const { return IsInt; } | |||
1522 | APSInt &getComplexIntReal() { return IntReal; } | |||
1523 | APSInt &getComplexIntImag() { return IntImag; } | |||
1524 | ||||
1525 | void moveInto(APValue &v) const { | |||
1526 | if (isComplexFloat()) | |||
1527 | v = APValue(FloatReal, FloatImag); | |||
1528 | else | |||
1529 | v = APValue(IntReal, IntImag); | |||
1530 | } | |||
1531 | void setFrom(const APValue &v) { | |||
1532 | assert(v.isComplexFloat() || v.isComplexInt())(static_cast <bool> (v.isComplexFloat() || v.isComplexInt ()) ? void (0) : __assert_fail ("v.isComplexFloat() || v.isComplexInt()" , "clang/lib/AST/ExprConstant.cpp", 1532, __extension__ __PRETTY_FUNCTION__ )); | |||
1533 | if (v.isComplexFloat()) { | |||
1534 | makeComplexFloat(); | |||
1535 | FloatReal = v.getComplexFloatReal(); | |||
1536 | FloatImag = v.getComplexFloatImag(); | |||
1537 | } else { | |||
1538 | makeComplexInt(); | |||
1539 | IntReal = v.getComplexIntReal(); | |||
1540 | IntImag = v.getComplexIntImag(); | |||
1541 | } | |||
1542 | } | |||
1543 | }; | |||
1544 | ||||
1545 | struct LValue { | |||
1546 | APValue::LValueBase Base; | |||
1547 | CharUnits Offset; | |||
1548 | SubobjectDesignator Designator; | |||
1549 | bool IsNullPtr : 1; | |||
1550 | bool InvalidBase : 1; | |||
1551 | ||||
1552 | const APValue::LValueBase getLValueBase() const { return Base; } | |||
1553 | CharUnits &getLValueOffset() { return Offset; } | |||
1554 | const CharUnits &getLValueOffset() const { return Offset; } | |||
1555 | SubobjectDesignator &getLValueDesignator() { return Designator; } | |||
1556 | const SubobjectDesignator &getLValueDesignator() const { return Designator;} | |||
1557 | bool isNullPointer() const { return IsNullPtr;} | |||
1558 | ||||
1559 | unsigned getLValueCallIndex() const { return Base.getCallIndex(); } | |||
1560 | unsigned getLValueVersion() const { return Base.getVersion(); } | |||
1561 | ||||
1562 | void moveInto(APValue &V) const { | |||
1563 | if (Designator.Invalid) | |||
1564 | V = APValue(Base, Offset, APValue::NoLValuePath(), IsNullPtr); | |||
1565 | else { | |||
1566 | assert(!InvalidBase && "APValues can't handle invalid LValue bases")(static_cast <bool> (!InvalidBase && "APValues can't handle invalid LValue bases" ) ? void (0) : __assert_fail ("!InvalidBase && \"APValues can't handle invalid LValue bases\"" , "clang/lib/AST/ExprConstant.cpp", 1566, __extension__ __PRETTY_FUNCTION__ )); | |||
1567 | V = APValue(Base, Offset, Designator.Entries, | |||
1568 | Designator.IsOnePastTheEnd, IsNullPtr); | |||
1569 | } | |||
1570 | } | |||
1571 | void setFrom(ASTContext &Ctx, const APValue &V) { | |||
1572 | assert(V.isLValue() && "Setting LValue from a non-LValue?")(static_cast <bool> (V.isLValue() && "Setting LValue from a non-LValue?" ) ? void (0) : __assert_fail ("V.isLValue() && \"Setting LValue from a non-LValue?\"" , "clang/lib/AST/ExprConstant.cpp", 1572, __extension__ __PRETTY_FUNCTION__ )); | |||
1573 | Base = V.getLValueBase(); | |||
1574 | Offset = V.getLValueOffset(); | |||
1575 | InvalidBase = false; | |||
1576 | Designator = SubobjectDesignator(Ctx, V); | |||
1577 | IsNullPtr = V.isNullPointer(); | |||
1578 | } | |||
1579 | ||||
1580 | void set(APValue::LValueBase B, bool BInvalid = false) { | |||
1581 | #ifndef NDEBUG | |||
1582 | // We only allow a few types of invalid bases. Enforce that here. | |||
1583 | if (BInvalid) { | |||
1584 | const auto *E = B.get<const Expr *>(); | |||
1585 | assert((isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) &&(static_cast <bool> ((isa<MemberExpr>(E) || tryUnwrapAllocSizeCall (E)) && "Unexpected type of invalid base") ? void (0) : __assert_fail ("(isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) && \"Unexpected type of invalid base\"" , "clang/lib/AST/ExprConstant.cpp", 1586, __extension__ __PRETTY_FUNCTION__ )) | |||
1586 | "Unexpected type of invalid base")(static_cast <bool> ((isa<MemberExpr>(E) || tryUnwrapAllocSizeCall (E)) && "Unexpected type of invalid base") ? void (0) : __assert_fail ("(isa<MemberExpr>(E) || tryUnwrapAllocSizeCall(E)) && \"Unexpected type of invalid base\"" , "clang/lib/AST/ExprConstant.cpp", 1586, __extension__ __PRETTY_FUNCTION__ )); | |||
1587 | } | |||
1588 | #endif | |||
1589 | ||||
1590 | Base = B; | |||
1591 | Offset = CharUnits::fromQuantity(0); | |||
1592 | InvalidBase = BInvalid; | |||
1593 | Designator = SubobjectDesignator(getType(B)); | |||
1594 | IsNullPtr = false; | |||
1595 | } | |||
1596 | ||||
1597 | void setNull(ASTContext &Ctx, QualType PointerTy) { | |||
1598 | Base = (const ValueDecl *)nullptr; | |||
1599 | Offset = | |||
1600 | CharUnits::fromQuantity(Ctx.getTargetNullPointerValue(PointerTy)); | |||
1601 | InvalidBase = false; | |||
1602 | Designator = SubobjectDesignator(PointerTy->getPointeeType()); | |||
1603 | IsNullPtr = true; | |||
1604 | } | |||
1605 | ||||
1606 | void setInvalid(APValue::LValueBase B, unsigned I = 0) { | |||
1607 | set(B, true); | |||
1608 | } | |||
1609 | ||||
1610 | std::string toString(ASTContext &Ctx, QualType T) const { | |||
1611 | APValue Printable; | |||
1612 | moveInto(Printable); | |||
1613 | return Printable.getAsString(Ctx, T); | |||
1614 | } | |||
1615 | ||||
1616 | private: | |||
1617 | // Check that this LValue is not based on a null pointer. If it is, produce | |||
1618 | // a diagnostic and mark the designator as invalid. | |||
1619 | template <typename GenDiagType> | |||
1620 | bool checkNullPointerDiagnosingWith(const GenDiagType &GenDiag) { | |||
1621 | if (Designator.Invalid) | |||
1622 | return false; | |||
1623 | if (IsNullPtr) { | |||
1624 | GenDiag(); | |||
1625 | Designator.setInvalid(); | |||
1626 | return false; | |||
1627 | } | |||
1628 | return true; | |||
1629 | } | |||
1630 | ||||
1631 | public: | |||
1632 | bool checkNullPointer(EvalInfo &Info, const Expr *E, | |||
1633 | CheckSubobjectKind CSK) { | |||
1634 | return checkNullPointerDiagnosingWith([&Info, E, CSK] { | |||
1635 | Info.CCEDiag(E, diag::note_constexpr_null_subobject) << CSK; | |||
1636 | }); | |||
1637 | } | |||
1638 | ||||
1639 | bool checkNullPointerForFoldAccess(EvalInfo &Info, const Expr *E, | |||
1640 | AccessKinds AK) { | |||
1641 | return checkNullPointerDiagnosingWith([&Info, E, AK] { | |||
1642 | Info.FFDiag(E, diag::note_constexpr_access_null) << AK; | |||
1643 | }); | |||
1644 | } | |||
1645 | ||||
1646 | // Check this LValue refers to an object. If not, set the designator to be | |||
1647 | // invalid and emit a diagnostic. | |||
1648 | bool checkSubobject(EvalInfo &Info, const Expr *E, CheckSubobjectKind CSK) { | |||
1649 | return (CSK == CSK_ArrayToPointer || checkNullPointer(Info, E, CSK)) && | |||
1650 | Designator.checkSubobject(Info, E, CSK); | |||
1651 | } | |||
1652 | ||||
1653 | void addDecl(EvalInfo &Info, const Expr *E, | |||
1654 | const Decl *D, bool Virtual = false) { | |||
1655 | if (checkSubobject(Info, E, isa<FieldDecl>(D) ? CSK_Field : CSK_Base)) | |||
1656 | Designator.addDeclUnchecked(D, Virtual); | |||
1657 | } | |||
1658 | void addUnsizedArray(EvalInfo &Info, const Expr *E, QualType ElemTy) { | |||
1659 | if (!Designator.Entries.empty()) { | |||
1660 | Info.CCEDiag(E, diag::note_constexpr_unsupported_unsized_array); | |||
1661 | Designator.setInvalid(); | |||
1662 | return; | |||
1663 | } | |||
1664 | if (checkSubobject(Info, E, CSK_ArrayToPointer)) { | |||
1665 | assert(getType(Base)->isPointerType() || getType(Base)->isArrayType())(static_cast <bool> (getType(Base)->isPointerType() || getType(Base)->isArrayType()) ? void (0) : __assert_fail ( "getType(Base)->isPointerType() || getType(Base)->isArrayType()" , "clang/lib/AST/ExprConstant.cpp", 1665, __extension__ __PRETTY_FUNCTION__ )); | |||
1666 | Designator.FirstEntryIsAnUnsizedArray = true; | |||
1667 | Designator.addUnsizedArrayUnchecked(ElemTy); | |||
1668 | } | |||
1669 | } | |||
1670 | void addArray(EvalInfo &Info, const Expr *E, const ConstantArrayType *CAT) { | |||
1671 | if (checkSubobject(Info, E, CSK_ArrayToPointer)) | |||
1672 | Designator.addArrayUnchecked(CAT); | |||
1673 | } | |||
1674 | void addComplex(EvalInfo &Info, const Expr *E, QualType EltTy, bool Imag) { | |||
1675 | if (checkSubobject(Info, E, Imag ? CSK_Imag : CSK_Real)) | |||
1676 | Designator.addComplexUnchecked(EltTy, Imag); | |||
1677 | } | |||
1678 | void clearIsNullPointer() { | |||
1679 | IsNullPtr = false; | |||
1680 | } | |||
1681 | void adjustOffsetAndIndex(EvalInfo &Info, const Expr *E, | |||
1682 | const APSInt &Index, CharUnits ElementSize) { | |||
1683 | // An index of 0 has no effect. (In C, adding 0 to a null pointer is UB, | |||
1684 | // but we're not required to diagnose it and it's valid in C++.) | |||
1685 | if (!Index) | |||
1686 | return; | |||
1687 | ||||
1688 | // Compute the new offset in the appropriate width, wrapping at 64 bits. | |||
1689 | // FIXME: When compiling for a 32-bit target, we should use 32-bit | |||
1690 | // offsets. | |||
1691 | uint64_t Offset64 = Offset.getQuantity(); | |||
1692 | uint64_t ElemSize64 = ElementSize.getQuantity(); | |||
1693 | uint64_t Index64 = Index.extOrTrunc(64).getZExtValue(); | |||
1694 | Offset = CharUnits::fromQuantity(Offset64 + ElemSize64 * Index64); | |||
1695 | ||||
1696 | if (checkNullPointer(Info, E, CSK_ArrayIndex)) | |||
1697 | Designator.adjustIndex(Info, E, Index); | |||
1698 | clearIsNullPointer(); | |||
1699 | } | |||
1700 | void adjustOffset(CharUnits N) { | |||
1701 | Offset += N; | |||
1702 | if (N.getQuantity()) | |||
1703 | clearIsNullPointer(); | |||
1704 | } | |||
1705 | }; | |||
1706 | ||||
1707 | struct MemberPtr { | |||
1708 | MemberPtr() {} | |||
1709 | explicit MemberPtr(const ValueDecl *Decl) | |||
1710 | : DeclAndIsDerivedMember(Decl, false) {} | |||
1711 | ||||
1712 | /// The member or (direct or indirect) field referred to by this member | |||
1713 | /// pointer, or 0 if this is a null member pointer. | |||
1714 | const ValueDecl *getDecl() const { | |||
1715 | return DeclAndIsDerivedMember.getPointer(); | |||
1716 | } | |||
1717 | /// Is this actually a member of some type derived from the relevant class? | |||
1718 | bool isDerivedMember() const { | |||
1719 | return DeclAndIsDerivedMember.getInt(); | |||
1720 | } | |||
1721 | /// Get the class which the declaration actually lives in. | |||
1722 | const CXXRecordDecl *getContainingRecord() const { | |||
1723 | return cast<CXXRecordDecl>( | |||
1724 | DeclAndIsDerivedMember.getPointer()->getDeclContext()); | |||
1725 | } | |||
1726 | ||||
1727 | void moveInto(APValue &V) const { | |||
1728 | V = APValue(getDecl(), isDerivedMember(), Path); | |||
1729 | } | |||
1730 | void setFrom(const APValue &V) { | |||
1731 | assert(V.isMemberPointer())(static_cast <bool> (V.isMemberPointer()) ? void (0) : __assert_fail ("V.isMemberPointer()", "clang/lib/AST/ExprConstant.cpp", 1731 , __extension__ __PRETTY_FUNCTION__)); | |||
1732 | DeclAndIsDerivedMember.setPointer(V.getMemberPointerDecl()); | |||
1733 | DeclAndIsDerivedMember.setInt(V.isMemberPointerToDerivedMember()); | |||
1734 | Path.clear(); | |||
1735 | ArrayRef<const CXXRecordDecl*> P = V.getMemberPointerPath(); | |||
1736 | Path.insert(Path.end(), P.begin(), P.end()); | |||
1737 | } | |||
1738 | ||||
1739 | /// DeclAndIsDerivedMember - The member declaration, and a flag indicating | |||
1740 | /// whether the member is a member of some class derived from the class type | |||
1741 | /// of the member pointer. | |||
1742 | llvm::PointerIntPair<const ValueDecl*, 1, bool> DeclAndIsDerivedMember; | |||
1743 | /// Path - The path of base/derived classes from the member declaration's | |||
1744 | /// class (exclusive) to the class type of the member pointer (inclusive). | |||
1745 | SmallVector<const CXXRecordDecl*, 4> Path; | |||
1746 | ||||
1747 | /// Perform a cast towards the class of the Decl (either up or down the | |||
1748 | /// hierarchy). | |||
1749 | bool castBack(const CXXRecordDecl *Class) { | |||
1750 | assert(!Path.empty())(static_cast <bool> (!Path.empty()) ? void (0) : __assert_fail ("!Path.empty()", "clang/lib/AST/ExprConstant.cpp", 1750, __extension__ __PRETTY_FUNCTION__)); | |||
1751 | const CXXRecordDecl *Expected; | |||
1752 | if (Path.size() >= 2) | |||
1753 | Expected = Path[Path.size() - 2]; | |||
1754 | else | |||
1755 | Expected = getContainingRecord(); | |||
1756 | if (Expected->getCanonicalDecl() != Class->getCanonicalDecl()) { | |||
1757 | // C++11 [expr.static.cast]p12: In a conversion from (D::*) to (B::*), | |||
1758 | // if B does not contain the original member and is not a base or | |||
1759 | // derived class of the class containing the original member, the result | |||
1760 | // of the cast is undefined. | |||
1761 | // C++11 [conv.mem]p2 does not cover this case for a cast from (B::*) to | |||
1762 | // (D::*). We consider that to be a language defect. | |||
1763 | return false; | |||
1764 | } | |||
1765 | Path.pop_back(); | |||
1766 | return true; | |||
1767 | } | |||
1768 | /// Perform a base-to-derived member pointer cast. | |||
1769 | bool castToDerived(const CXXRecordDecl *Derived) { | |||
1770 | if (!getDecl()) | |||
1771 | return true; | |||
1772 | if (!isDerivedMember()) { | |||
1773 | Path.push_back(Derived); | |||
1774 | return true; | |||
1775 | } | |||
1776 | if (!castBack(Derived)) | |||
1777 | return false; | |||
1778 | if (Path.empty()) | |||
1779 | DeclAndIsDerivedMember.setInt(false); | |||
1780 | return true; | |||
1781 | } | |||
1782 | /// Perform a derived-to-base member pointer cast. | |||
1783 | bool castToBase(const CXXRecordDecl *Base) { | |||
1784 | if (!getDecl()) | |||
1785 | return true; | |||
1786 | if (Path.empty()) | |||
1787 | DeclAndIsDerivedMember.setInt(true); | |||
1788 | if (isDerivedMember()) { | |||
1789 | Path.push_back(Base); | |||
1790 | return true; | |||
1791 | } | |||
1792 | return castBack(Base); | |||
1793 | } | |||
1794 | }; | |||
1795 | ||||
1796 | /// Compare two member pointers, which are assumed to be of the same type. | |||
1797 | static bool operator==(const MemberPtr &LHS, const MemberPtr &RHS) { | |||
1798 | if (!LHS.getDecl() || !RHS.getDecl()) | |||
1799 | return !LHS.getDecl() && !RHS.getDecl(); | |||
1800 | if (LHS.getDecl()->getCanonicalDecl() != RHS.getDecl()->getCanonicalDecl()) | |||
1801 | return false; | |||
1802 | return LHS.Path == RHS.Path; | |||
1803 | } | |||
1804 | } | |||
1805 | ||||
1806 | static bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E); | |||
1807 | static bool EvaluateInPlace(APValue &Result, EvalInfo &Info, | |||
1808 | const LValue &This, const Expr *E, | |||
1809 | bool AllowNonLiteralTypes = false); | |||
1810 | static bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info, | |||
1811 | bool InvalidBaseOK = false); | |||
1812 | static bool EvaluatePointer(const Expr *E, LValue &Result, EvalInfo &Info, | |||
1813 | bool InvalidBaseOK = false); | |||
1814 | static bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, | |||
1815 | EvalInfo &Info); | |||
1816 | static bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info); | |||
1817 | static bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info); | |||
1818 | static bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, | |||
1819 | EvalInfo &Info); | |||
1820 | static bool EvaluateFloat(const Expr *E, APFloat &Result, EvalInfo &Info); | |||
1821 | static bool EvaluateComplex(const Expr *E, ComplexValue &Res, EvalInfo &Info); | |||
1822 | static bool EvaluateAtomic(const Expr *E, const LValue *This, APValue &Result, | |||
1823 | EvalInfo &Info); | |||
1824 | static bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result); | |||
1825 | static bool EvaluateBuiltinStrLen(const Expr *E, uint64_t &Result, | |||
1826 | EvalInfo &Info); | |||
1827 | ||||
1828 | /// Evaluate an integer or fixed point expression into an APResult. | |||
1829 | static bool EvaluateFixedPointOrInteger(const Expr *E, APFixedPoint &Result, | |||
1830 | EvalInfo &Info); | |||
1831 | ||||
1832 | /// Evaluate only a fixed point expression into an APResult. | |||
1833 | static bool EvaluateFixedPoint(const Expr *E, APFixedPoint &Result, | |||
1834 | EvalInfo &Info); | |||
1835 | ||||
1836 | //===----------------------------------------------------------------------===// | |||
1837 | // Misc utilities | |||
1838 | //===----------------------------------------------------------------------===// | |||
1839 | ||||
1840 | /// Negate an APSInt in place, converting it to a signed form if necessary, and | |||
1841 | /// preserving its value (by extending by up to one bit as needed). | |||
1842 | static void negateAsSigned(APSInt &Int) { | |||
1843 | if (Int.isUnsigned() || Int.isMinSignedValue()) { | |||
1844 | Int = Int.extend(Int.getBitWidth() + 1); | |||
1845 | Int.setIsSigned(true); | |||
1846 | } | |||
1847 | Int = -Int; | |||
1848 | } | |||
1849 | ||||
1850 | template<typename KeyT> | |||
1851 | APValue &CallStackFrame::createTemporary(const KeyT *Key, QualType T, | |||
1852 | ScopeKind Scope, LValue &LV) { | |||
1853 | unsigned Version = getTempVersion(); | |||
1854 | APValue::LValueBase Base(Key, Index, Version); | |||
1855 | LV.set(Base); | |||
1856 | return createLocal(Base, Key, T, Scope); | |||
1857 | } | |||
1858 | ||||
1859 | /// Allocate storage for a parameter of a function call made in this frame. | |||
1860 | APValue &CallStackFrame::createParam(CallRef Args, const ParmVarDecl *PVD, | |||
1861 | LValue &LV) { | |||
1862 | assert(Args.CallIndex == Index && "creating parameter in wrong frame")(static_cast <bool> (Args.CallIndex == Index && "creating parameter in wrong frame") ? void (0) : __assert_fail ("Args.CallIndex == Index && \"creating parameter in wrong frame\"" , "clang/lib/AST/ExprConstant.cpp", 1862, __extension__ __PRETTY_FUNCTION__ )); | |||
1863 | APValue::LValueBase Base(PVD, Index, Args.Version); | |||
1864 | LV.set(Base); | |||
1865 | // We always destroy parameters at the end of the call, even if we'd allow | |||
1866 | // them to live to the end of the full-expression at runtime, in order to | |||
1867 | // give portable results and match other compilers. | |||
1868 | return createLocal(Base, PVD, PVD->getType(), ScopeKind::Call); | |||
1869 | } | |||
1870 | ||||
1871 | APValue &CallStackFrame::createLocal(APValue::LValueBase Base, const void *Key, | |||
1872 | QualType T, ScopeKind Scope) { | |||
1873 | assert(Base.getCallIndex() == Index && "lvalue for wrong frame")(static_cast <bool> (Base.getCallIndex() == Index && "lvalue for wrong frame") ? void (0) : __assert_fail ("Base.getCallIndex() == Index && \"lvalue for wrong frame\"" , "clang/lib/AST/ExprConstant.cpp", 1873, __extension__ __PRETTY_FUNCTION__ )); | |||
1874 | unsigned Version = Base.getVersion(); | |||
1875 | APValue &Result = Temporaries[MapKeyTy(Key, Version)]; | |||
1876 | assert(Result.isAbsent() && "local created multiple times")(static_cast <bool> (Result.isAbsent() && "local created multiple times" ) ? void (0) : __assert_fail ("Result.isAbsent() && \"local created multiple times\"" , "clang/lib/AST/ExprConstant.cpp", 1876, __extension__ __PRETTY_FUNCTION__ )); | |||
1877 | ||||
1878 | // If we're creating a local immediately in the operand of a speculative | |||
1879 | // evaluation, don't register a cleanup to be run outside the speculative | |||
1880 | // evaluation context, since we won't actually be able to initialize this | |||
1881 | // object. | |||
1882 | if (Index <= Info.SpeculativeEvaluationDepth) { | |||
1883 | if (T.isDestructedType()) | |||
1884 | Info.noteSideEffect(); | |||
1885 | } else { | |||
1886 | Info.CleanupStack.push_back(Cleanup(&Result, Base, T, Scope)); | |||
1887 | } | |||
1888 | return Result; | |||
1889 | } | |||
1890 | ||||
1891 | APValue *EvalInfo::createHeapAlloc(const Expr *E, QualType T, LValue &LV) { | |||
1892 | if (NumHeapAllocs > DynamicAllocLValue::getMaxIndex()) { | |||
1893 | FFDiag(E, diag::note_constexpr_heap_alloc_limit_exceeded); | |||
1894 | return nullptr; | |||
1895 | } | |||
1896 | ||||
1897 | DynamicAllocLValue DA(NumHeapAllocs++); | |||
1898 | LV.set(APValue::LValueBase::getDynamicAlloc(DA, T)); | |||
1899 | auto Result = HeapAllocs.emplace(std::piecewise_construct, | |||
1900 | std::forward_as_tuple(DA), std::tuple<>()); | |||
1901 | assert(Result.second && "reused a heap alloc index?")(static_cast <bool> (Result.second && "reused a heap alloc index?" ) ? void (0) : __assert_fail ("Result.second && \"reused a heap alloc index?\"" , "clang/lib/AST/ExprConstant.cpp", 1901, __extension__ __PRETTY_FUNCTION__ )); | |||
1902 | Result.first->second.AllocExpr = E; | |||
1903 | return &Result.first->second.Value; | |||
1904 | } | |||
1905 | ||||
1906 | /// Produce a string describing the given constexpr call. | |||
1907 | void CallStackFrame::describe(raw_ostream &Out) { | |||
1908 | unsigned ArgIndex = 0; | |||
1909 | bool IsMemberCall = isa<CXXMethodDecl>(Callee) && | |||
1910 | !isa<CXXConstructorDecl>(Callee) && | |||
1911 | cast<CXXMethodDecl>(Callee)->isInstance(); | |||
1912 | ||||
1913 | if (!IsMemberCall) | |||
1914 | Out << *Callee << '('; | |||
1915 | ||||
1916 | if (This && IsMemberCall) { | |||
1917 | APValue Val; | |||
1918 | This->moveInto(Val); | |||
1919 | Val.printPretty(Out, Info.Ctx, | |||
1920 | This->Designator.MostDerivedType); | |||
1921 | // FIXME: Add parens around Val if needed. | |||
1922 | Out << "->" << *Callee << '('; | |||
1923 | IsMemberCall = false; | |||
1924 | } | |||
1925 | ||||
1926 | for (FunctionDecl::param_const_iterator I = Callee->param_begin(), | |||
1927 | E = Callee->param_end(); I != E; ++I, ++ArgIndex) { | |||
1928 | if (ArgIndex > (unsigned)IsMemberCall) | |||
1929 | Out << ", "; | |||
1930 | ||||
1931 | const ParmVarDecl *Param = *I; | |||
1932 | APValue *V = Info.getParamSlot(Arguments, Param); | |||
1933 | if (V) | |||
1934 | V->printPretty(Out, Info.Ctx, Param->getType()); | |||
1935 | else | |||
1936 | Out << "<...>"; | |||
1937 | ||||
1938 | if (ArgIndex == 0 && IsMemberCall) | |||
1939 | Out << "->" << *Callee << '('; | |||
1940 | } | |||
1941 | ||||
1942 | Out << ')'; | |||
1943 | } | |||
1944 | ||||
1945 | /// Evaluate an expression to see if it had side-effects, and discard its | |||
1946 | /// result. | |||
1947 | /// \return \c true if the caller should keep evaluating. | |||
1948 | static bool EvaluateIgnoredValue(EvalInfo &Info, const Expr *E) { | |||
1949 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 1949, __extension__ __PRETTY_FUNCTION__)); | |||
1950 | APValue Scratch; | |||
1951 | if (!Evaluate(Scratch, Info, E)) | |||
1952 | // We don't need the value, but we might have skipped a side effect here. | |||
1953 | return Info.noteSideEffect(); | |||
1954 | return true; | |||
1955 | } | |||
1956 | ||||
1957 | /// Should this call expression be treated as a constant? | |||
1958 | static bool IsConstantCall(const CallExpr *E) { | |||
1959 | unsigned Builtin = E->getBuiltinCallee(); | |||
1960 | return (Builtin == Builtin::BI__builtin___CFStringMakeConstantString || | |||
1961 | Builtin == Builtin::BI__builtin___NSStringMakeConstantString || | |||
1962 | Builtin == Builtin::BI__builtin_function_start); | |||
1963 | } | |||
1964 | ||||
1965 | static bool IsGlobalLValue(APValue::LValueBase B) { | |||
1966 | // C++11 [expr.const]p3 An address constant expression is a prvalue core | |||
1967 | // constant expression of pointer type that evaluates to... | |||
1968 | ||||
1969 | // ... a null pointer value, or a prvalue core constant expression of type | |||
1970 | // std::nullptr_t. | |||
1971 | if (!B) return true; | |||
1972 | ||||
1973 | if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { | |||
1974 | // ... the address of an object with static storage duration, | |||
1975 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) | |||
1976 | return VD->hasGlobalStorage(); | |||
1977 | if (isa<TemplateParamObjectDecl>(D)) | |||
1978 | return true; | |||
1979 | // ... the address of a function, | |||
1980 | // ... the address of a GUID [MS extension], | |||
1981 | return isa<FunctionDecl>(D) || isa<MSGuidDecl>(D); | |||
1982 | } | |||
1983 | ||||
1984 | if (B.is<TypeInfoLValue>() || B.is<DynamicAllocLValue>()) | |||
1985 | return true; | |||
1986 | ||||
1987 | const Expr *E = B.get<const Expr*>(); | |||
1988 | switch (E->getStmtClass()) { | |||
1989 | default: | |||
1990 | return false; | |||
1991 | case Expr::CompoundLiteralExprClass: { | |||
1992 | const CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E); | |||
1993 | return CLE->isFileScope() && CLE->isLValue(); | |||
1994 | } | |||
1995 | case Expr::MaterializeTemporaryExprClass: | |||
1996 | // A materialized temporary might have been lifetime-extended to static | |||
1997 | // storage duration. | |||
1998 | return cast<MaterializeTemporaryExpr>(E)->getStorageDuration() == SD_Static; | |||
1999 | // A string literal has static storage duration. | |||
2000 | case Expr::StringLiteralClass: | |||
2001 | case Expr::PredefinedExprClass: | |||
2002 | case Expr::ObjCStringLiteralClass: | |||
2003 | case Expr::ObjCEncodeExprClass: | |||
2004 | return true; | |||
2005 | case Expr::ObjCBoxedExprClass: | |||
2006 | return cast<ObjCBoxedExpr>(E)->isExpressibleAsConstantInitializer(); | |||
2007 | case Expr::CallExprClass: | |||
2008 | return IsConstantCall(cast<CallExpr>(E)); | |||
2009 | // For GCC compatibility, &&label has static storage duration. | |||
2010 | case Expr::AddrLabelExprClass: | |||
2011 | return true; | |||
2012 | // A Block literal expression may be used as the initialization value for | |||
2013 | // Block variables at global or local static scope. | |||
2014 | case Expr::BlockExprClass: | |||
2015 | return !cast<BlockExpr>(E)->getBlockDecl()->hasCaptures(); | |||
2016 | case Expr::ImplicitValueInitExprClass: | |||
2017 | // FIXME: | |||
2018 | // We can never form an lvalue with an implicit value initialization as its | |||
2019 | // base through expression evaluation, so these only appear in one case: the | |||
2020 | // implicit variable declaration we invent when checking whether a constexpr | |||
2021 | // constructor can produce a constant expression. We must assume that such | |||
2022 | // an expression might be a global lvalue. | |||
2023 | return true; | |||
2024 | } | |||
2025 | } | |||
2026 | ||||
2027 | static const ValueDecl *GetLValueBaseDecl(const LValue &LVal) { | |||
2028 | return LVal.Base.dyn_cast<const ValueDecl*>(); | |||
2029 | } | |||
2030 | ||||
2031 | static bool IsLiteralLValue(const LValue &Value) { | |||
2032 | if (Value.getLValueCallIndex()) | |||
2033 | return false; | |||
2034 | const Expr *E = Value.Base.dyn_cast<const Expr*>(); | |||
2035 | return E && !isa<MaterializeTemporaryExpr>(E); | |||
2036 | } | |||
2037 | ||||
2038 | static bool IsWeakLValue(const LValue &Value) { | |||
2039 | const ValueDecl *Decl = GetLValueBaseDecl(Value); | |||
2040 | return Decl && Decl->isWeak(); | |||
2041 | } | |||
2042 | ||||
2043 | static bool isZeroSized(const LValue &Value) { | |||
2044 | const ValueDecl *Decl = GetLValueBaseDecl(Value); | |||
2045 | if (Decl && isa<VarDecl>(Decl)) { | |||
2046 | QualType Ty = Decl->getType(); | |||
2047 | if (Ty->isArrayType()) | |||
2048 | return Ty->isIncompleteType() || | |||
2049 | Decl->getASTContext().getTypeSize(Ty) == 0; | |||
2050 | } | |||
2051 | return false; | |||
2052 | } | |||
2053 | ||||
2054 | static bool HasSameBase(const LValue &A, const LValue &B) { | |||
2055 | if (!A.getLValueBase()) | |||
2056 | return !B.getLValueBase(); | |||
2057 | if (!B.getLValueBase()) | |||
2058 | return false; | |||
2059 | ||||
2060 | if (A.getLValueBase().getOpaqueValue() != | |||
2061 | B.getLValueBase().getOpaqueValue()) | |||
2062 | return false; | |||
2063 | ||||
2064 | return A.getLValueCallIndex() == B.getLValueCallIndex() && | |||
2065 | A.getLValueVersion() == B.getLValueVersion(); | |||
2066 | } | |||
2067 | ||||
2068 | static void NoteLValueLocation(EvalInfo &Info, APValue::LValueBase Base) { | |||
2069 | assert(Base && "no location for a null lvalue")(static_cast <bool> (Base && "no location for a null lvalue" ) ? void (0) : __assert_fail ("Base && \"no location for a null lvalue\"" , "clang/lib/AST/ExprConstant.cpp", 2069, __extension__ __PRETTY_FUNCTION__ )); | |||
2070 | const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); | |||
2071 | ||||
2072 | // For a parameter, find the corresponding call stack frame (if it still | |||
2073 | // exists), and point at the parameter of the function definition we actually | |||
2074 | // invoked. | |||
2075 | if (auto *PVD = dyn_cast_or_null<ParmVarDecl>(VD)) { | |||
2076 | unsigned Idx = PVD->getFunctionScopeIndex(); | |||
2077 | for (CallStackFrame *F = Info.CurrentCall; F; F = F->Caller) { | |||
2078 | if (F->Arguments.CallIndex == Base.getCallIndex() && | |||
2079 | F->Arguments.Version == Base.getVersion() && F->Callee && | |||
2080 | Idx < F->Callee->getNumParams()) { | |||
2081 | VD = F->Callee->getParamDecl(Idx); | |||
2082 | break; | |||
2083 | } | |||
2084 | } | |||
2085 | } | |||
2086 | ||||
2087 | if (VD) | |||
2088 | Info.Note(VD->getLocation(), diag::note_declared_at); | |||
2089 | else if (const Expr *E = Base.dyn_cast<const Expr*>()) | |||
2090 | Info.Note(E->getExprLoc(), diag::note_constexpr_temporary_here); | |||
2091 | else if (DynamicAllocLValue DA = Base.dyn_cast<DynamicAllocLValue>()) { | |||
2092 | // FIXME: Produce a note for dangling pointers too. | |||
2093 | if (Optional<DynAlloc*> Alloc = Info.lookupDynamicAlloc(DA)) | |||
2094 | Info.Note((*Alloc)->AllocExpr->getExprLoc(), | |||
2095 | diag::note_constexpr_dynamic_alloc_here); | |||
2096 | } | |||
2097 | // We have no information to show for a typeid(T) object. | |||
2098 | } | |||
2099 | ||||
2100 | enum class CheckEvaluationResultKind { | |||
2101 | ConstantExpression, | |||
2102 | FullyInitialized, | |||
2103 | }; | |||
2104 | ||||
2105 | /// Materialized temporaries that we've already checked to determine if they're | |||
2106 | /// initializsed by a constant expression. | |||
2107 | using CheckedTemporaries = | |||
2108 | llvm::SmallPtrSet<const MaterializeTemporaryExpr *, 8>; | |||
2109 | ||||
2110 | static bool CheckEvaluationResult(CheckEvaluationResultKind CERK, | |||
2111 | EvalInfo &Info, SourceLocation DiagLoc, | |||
2112 | QualType Type, const APValue &Value, | |||
2113 | ConstantExprKind Kind, | |||
2114 | SourceLocation SubobjectLoc, | |||
2115 | CheckedTemporaries &CheckedTemps); | |||
2116 | ||||
2117 | /// Check that this reference or pointer core constant expression is a valid | |||
2118 | /// value for an address or reference constant expression. Return true if we | |||
2119 | /// can fold this expression, whether or not it's a constant expression. | |||
2120 | static bool CheckLValueConstantExpression(EvalInfo &Info, SourceLocation Loc, | |||
2121 | QualType Type, const LValue &LVal, | |||
2122 | ConstantExprKind Kind, | |||
2123 | CheckedTemporaries &CheckedTemps) { | |||
2124 | bool IsReferenceType = Type->isReferenceType(); | |||
2125 | ||||
2126 | APValue::LValueBase Base = LVal.getLValueBase(); | |||
2127 | const SubobjectDesignator &Designator = LVal.getLValueDesignator(); | |||
2128 | ||||
2129 | const Expr *BaseE = Base.dyn_cast<const Expr *>(); | |||
2130 | const ValueDecl *BaseVD = Base.dyn_cast<const ValueDecl*>(); | |||
2131 | ||||
2132 | // Additional restrictions apply in a template argument. We only enforce the | |||
2133 | // C++20 restrictions here; additional syntactic and semantic restrictions | |||
2134 | // are applied elsewhere. | |||
2135 | if (isTemplateArgument(Kind)) { | |||
2136 | int InvalidBaseKind = -1; | |||
2137 | StringRef Ident; | |||
2138 | if (Base.is<TypeInfoLValue>()) | |||
2139 | InvalidBaseKind = 0; | |||
2140 | else if (isa_and_nonnull<StringLiteral>(BaseE)) | |||
2141 | InvalidBaseKind = 1; | |||
2142 | else if (isa_and_nonnull<MaterializeTemporaryExpr>(BaseE) || | |||
2143 | isa_and_nonnull<LifetimeExtendedTemporaryDecl>(BaseVD)) | |||
2144 | InvalidBaseKind = 2; | |||
2145 | else if (auto *PE = dyn_cast_or_null<PredefinedExpr>(BaseE)) { | |||
2146 | InvalidBaseKind = 3; | |||
2147 | Ident = PE->getIdentKindName(); | |||
2148 | } | |||
2149 | ||||
2150 | if (InvalidBaseKind != -1) { | |||
2151 | Info.FFDiag(Loc, diag::note_constexpr_invalid_template_arg) | |||
2152 | << IsReferenceType << !Designator.Entries.empty() << InvalidBaseKind | |||
2153 | << Ident; | |||
2154 | return false; | |||
2155 | } | |||
2156 | } | |||
2157 | ||||
2158 | if (auto *FD = dyn_cast_or_null<FunctionDecl>(BaseVD)) { | |||
2159 | if (FD->isConsteval()) { | |||
2160 | Info.FFDiag(Loc, diag::note_consteval_address_accessible) | |||
2161 | << !Type->isAnyPointerType(); | |||
2162 | Info.Note(FD->getLocation(), diag::note_declared_at); | |||
2163 | return false; | |||
2164 | } | |||
2165 | } | |||
2166 | ||||
2167 | // Check that the object is a global. Note that the fake 'this' object we | |||
2168 | // manufacture when checking potential constant expressions is conservatively | |||
2169 | // assumed to be global here. | |||
2170 | if (!IsGlobalLValue(Base)) { | |||
2171 | if (Info.getLangOpts().CPlusPlus11) { | |||
2172 | const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>(); | |||
2173 | Info.FFDiag(Loc, diag::note_constexpr_non_global, 1) | |||
2174 | << IsReferenceType << !Designator.Entries.empty() | |||
2175 | << !!VD << VD; | |||
2176 | ||||
2177 | auto *VarD = dyn_cast_or_null<VarDecl>(VD); | |||
2178 | if (VarD && VarD->isConstexpr()) { | |||
2179 | // Non-static local constexpr variables have unintuitive semantics: | |||
2180 | // constexpr int a = 1; | |||
2181 | // constexpr const int *p = &a; | |||
2182 | // ... is invalid because the address of 'a' is not constant. Suggest | |||
2183 | // adding a 'static' in this case. | |||
2184 | Info.Note(VarD->getLocation(), diag::note_constexpr_not_static) | |||
2185 | << VarD | |||
2186 | << FixItHint::CreateInsertion(VarD->getBeginLoc(), "static "); | |||
2187 | } else { | |||
2188 | NoteLValueLocation(Info, Base); | |||
2189 | } | |||
2190 | } else { | |||
2191 | Info.FFDiag(Loc); | |||
2192 | } | |||
2193 | // Don't allow references to temporaries to escape. | |||
2194 | return false; | |||
2195 | } | |||
2196 | assert((Info.checkingPotentialConstantExpression() ||(static_cast <bool> ((Info.checkingPotentialConstantExpression () || LVal.getLValueCallIndex() == 0) && "have call index for global lvalue" ) ? void (0) : __assert_fail ("(Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex() == 0) && \"have call index for global lvalue\"" , "clang/lib/AST/ExprConstant.cpp", 2198, __extension__ __PRETTY_FUNCTION__ )) | |||
2197 | LVal.getLValueCallIndex() == 0) &&(static_cast <bool> ((Info.checkingPotentialConstantExpression () || LVal.getLValueCallIndex() == 0) && "have call index for global lvalue" ) ? void (0) : __assert_fail ("(Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex() == 0) && \"have call index for global lvalue\"" , "clang/lib/AST/ExprConstant.cpp", 2198, __extension__ __PRETTY_FUNCTION__ )) | |||
2198 | "have call index for global lvalue")(static_cast <bool> ((Info.checkingPotentialConstantExpression () || LVal.getLValueCallIndex() == 0) && "have call index for global lvalue" ) ? void (0) : __assert_fail ("(Info.checkingPotentialConstantExpression() || LVal.getLValueCallIndex() == 0) && \"have call index for global lvalue\"" , "clang/lib/AST/ExprConstant.cpp", 2198, __extension__ __PRETTY_FUNCTION__ )); | |||
2199 | ||||
2200 | if (Base.is<DynamicAllocLValue>()) { | |||
2201 | Info.FFDiag(Loc, diag::note_constexpr_dynamic_alloc) | |||
2202 | << IsReferenceType << !Designator.Entries.empty(); | |||
2203 | NoteLValueLocation(Info, Base); | |||
2204 | return false; | |||
2205 | } | |||
2206 | ||||
2207 | if (BaseVD) { | |||
2208 | if (const VarDecl *Var = dyn_cast<const VarDecl>(BaseVD)) { | |||
2209 | // Check if this is a thread-local variable. | |||
2210 | if (Var->getTLSKind()) | |||
2211 | // FIXME: Diagnostic! | |||
2212 | return false; | |||
2213 | ||||
2214 | // A dllimport variable never acts like a constant, unless we're | |||
2215 | // evaluating a value for use only in name mangling. | |||
2216 | if (!isForManglingOnly(Kind) && Var->hasAttr<DLLImportAttr>()) | |||
2217 | // FIXME: Diagnostic! | |||
2218 | return false; | |||
2219 | ||||
2220 | // In CUDA/HIP device compilation, only device side variables have | |||
2221 | // constant addresses. | |||
2222 | if (Info.getCtx().getLangOpts().CUDA && | |||
2223 | Info.getCtx().getLangOpts().CUDAIsDevice && | |||
2224 | Info.getCtx().CUDAConstantEvalCtx.NoWrongSidedVars) { | |||
2225 | if ((!Var->hasAttr<CUDADeviceAttr>() && | |||
2226 | !Var->hasAttr<CUDAConstantAttr>() && | |||
2227 | !Var->getType()->isCUDADeviceBuiltinSurfaceType() && | |||
2228 | !Var->getType()->isCUDADeviceBuiltinTextureType()) || | |||
2229 | Var->hasAttr<HIPManagedAttr>()) | |||
2230 | return false; | |||
2231 | } | |||
2232 | } | |||
2233 | if (const auto *FD = dyn_cast<const FunctionDecl>(BaseVD)) { | |||
2234 | // __declspec(dllimport) must be handled very carefully: | |||
2235 | // We must never initialize an expression with the thunk in C++. | |||
2236 | // Doing otherwise would allow the same id-expression to yield | |||
2237 | // different addresses for the same function in different translation | |||
2238 | // units. However, this means that we must dynamically initialize the | |||
2239 | // expression with the contents of the import address table at runtime. | |||
2240 | // | |||
2241 | // The C language has no notion of ODR; furthermore, it has no notion of | |||
2242 | // dynamic initialization. This means that we are permitted to | |||
2243 | // perform initialization with the address of the thunk. | |||
2244 | if (Info.getLangOpts().CPlusPlus && !isForManglingOnly(Kind) && | |||
2245 | FD->hasAttr<DLLImportAttr>()) | |||
2246 | // FIXME: Diagnostic! | |||
2247 | return false; | |||
2248 | } | |||
2249 | } else if (const auto *MTE = | |||
2250 | dyn_cast_or_null<MaterializeTemporaryExpr>(BaseE)) { | |||
2251 | if (CheckedTemps.insert(MTE).second) { | |||
2252 | QualType TempType = getType(Base); | |||
2253 | if (TempType.isDestructedType()) { | |||
2254 | Info.FFDiag(MTE->getExprLoc(), | |||
2255 | diag::note_constexpr_unsupported_temporary_nontrivial_dtor) | |||
2256 | << TempType; | |||
2257 | return false; | |||
2258 | } | |||
2259 | ||||
2260 | APValue *V = MTE->getOrCreateValue(false); | |||
2261 | assert(V && "evasluation result refers to uninitialised temporary")(static_cast <bool> (V && "evasluation result refers to uninitialised temporary" ) ? void (0) : __assert_fail ("V && \"evasluation result refers to uninitialised temporary\"" , "clang/lib/AST/ExprConstant.cpp", 2261, __extension__ __PRETTY_FUNCTION__ )); | |||
2262 | if (!CheckEvaluationResult(CheckEvaluationResultKind::ConstantExpression, | |||
2263 | Info, MTE->getExprLoc(), TempType, *V, | |||
2264 | Kind, SourceLocation(), CheckedTemps)) | |||
2265 | return false; | |||
2266 | } | |||
2267 | } | |||
2268 | ||||
2269 | // Allow address constant expressions to be past-the-end pointers. This is | |||
2270 | // an extension: the standard requires them to point to an object. | |||
2271 | if (!IsReferenceType) | |||
2272 | return true; | |||
2273 | ||||
2274 | // A reference constant expression must refer to an object. | |||
2275 | if (!Base) { | |||
2276 | // FIXME: diagnostic | |||
2277 | Info.CCEDiag(Loc); | |||
2278 | return true; | |||
2279 | } | |||
2280 | ||||
2281 | // Does this refer one past the end of some object? | |||
2282 | if (!Designator.Invalid && Designator.isOnePastTheEnd()) { | |||
2283 | Info.FFDiag(Loc, diag::note_constexpr_past_end, 1) | |||
2284 | << !Designator.Entries.empty() << !!BaseVD << BaseVD; | |||
2285 | NoteLValueLocation(Info, Base); | |||
2286 | } | |||
2287 | ||||
2288 | return true; | |||
2289 | } | |||
2290 | ||||
2291 | /// Member pointers are constant expressions unless they point to a | |||
2292 | /// non-virtual dllimport member function. | |||
2293 | static bool CheckMemberPointerConstantExpression(EvalInfo &Info, | |||
2294 | SourceLocation Loc, | |||
2295 | QualType Type, | |||
2296 | const APValue &Value, | |||
2297 | ConstantExprKind Kind) { | |||
2298 | const ValueDecl *Member = Value.getMemberPointerDecl(); | |||
2299 | const auto *FD = dyn_cast_or_null<CXXMethodDecl>(Member); | |||
2300 | if (!FD) | |||
2301 | return true; | |||
2302 | if (FD->isConsteval()) { | |||
2303 | Info.FFDiag(Loc, diag::note_consteval_address_accessible) << /*pointer*/ 0; | |||
2304 | Info.Note(FD->getLocation(), diag::note_declared_at); | |||
2305 | return false; | |||
2306 | } | |||
2307 | return isForManglingOnly(Kind) || FD->isVirtual() || | |||
2308 | !FD->hasAttr<DLLImportAttr>(); | |||
2309 | } | |||
2310 | ||||
2311 | /// Check that this core constant expression is of literal type, and if not, | |||
2312 | /// produce an appropriate diagnostic. | |||
2313 | static bool CheckLiteralType(EvalInfo &Info, const Expr *E, | |||
2314 | const LValue *This = nullptr) { | |||
2315 | if (!E->isPRValue() || E->getType()->isLiteralType(Info.Ctx)) | |||
2316 | return true; | |||
2317 | ||||
2318 | // C++1y: A constant initializer for an object o [...] may also invoke | |||
2319 | // constexpr constructors for o and its subobjects even if those objects | |||
2320 | // are of non-literal class types. | |||
2321 | // | |||
2322 | // C++11 missed this detail for aggregates, so classes like this: | |||
2323 | // struct foo_t { union { int i; volatile int j; } u; }; | |||
2324 | // are not (obviously) initializable like so: | |||
2325 | // __attribute__((__require_constant_initialization__)) | |||
2326 | // static const foo_t x = {{0}}; | |||
2327 | // because "i" is a subobject with non-literal initialization (due to the | |||
2328 | // volatile member of the union). See: | |||
2329 | // http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1677 | |||
2330 | // Therefore, we use the C++1y behavior. | |||
2331 | if (This && Info.EvaluatingDecl == This->getLValueBase()) | |||
2332 | return true; | |||
2333 | ||||
2334 | // Prvalue constant expressions must be of literal types. | |||
2335 | if (Info.getLangOpts().CPlusPlus11) | |||
2336 | Info.FFDiag(E, diag::note_constexpr_nonliteral) | |||
2337 | << E->getType(); | |||
2338 | else | |||
2339 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
2340 | return false; | |||
2341 | } | |||
2342 | ||||
2343 | static bool CheckEvaluationResult(CheckEvaluationResultKind CERK, | |||
2344 | EvalInfo &Info, SourceLocation DiagLoc, | |||
2345 | QualType Type, const APValue &Value, | |||
2346 | ConstantExprKind Kind, | |||
2347 | SourceLocation SubobjectLoc, | |||
2348 | CheckedTemporaries &CheckedTemps) { | |||
2349 | if (!Value.hasValue()) { | |||
2350 | Info.FFDiag(DiagLoc, diag::note_constexpr_uninitialized) | |||
2351 | << true << Type; | |||
2352 | if (SubobjectLoc.isValid()) | |||
2353 | Info.Note(SubobjectLoc, diag::note_constexpr_subobject_declared_here); | |||
2354 | return false; | |||
2355 | } | |||
2356 | ||||
2357 | // We allow _Atomic(T) to be initialized from anything that T can be | |||
2358 | // initialized from. | |||
2359 | if (const AtomicType *AT = Type->getAs<AtomicType>()) | |||
2360 | Type = AT->getValueType(); | |||
2361 | ||||
2362 | // Core issue 1454: For a literal constant expression of array or class type, | |||
2363 | // each subobject of its value shall have been initialized by a constant | |||
2364 | // expression. | |||
2365 | if (Value.isArray()) { | |||
2366 | QualType EltTy = Type->castAsArrayTypeUnsafe()->getElementType(); | |||
2367 | for (unsigned I = 0, N = Value.getArrayInitializedElts(); I != N; ++I) { | |||
2368 | if (!CheckEvaluationResult(CERK, Info, DiagLoc, EltTy, | |||
2369 | Value.getArrayInitializedElt(I), Kind, | |||
2370 | SubobjectLoc, CheckedTemps)) | |||
2371 | return false; | |||
2372 | } | |||
2373 | if (!Value.hasArrayFiller()) | |||
2374 | return true; | |||
2375 | return CheckEvaluationResult(CERK, Info, DiagLoc, EltTy, | |||
2376 | Value.getArrayFiller(), Kind, SubobjectLoc, | |||
2377 | CheckedTemps); | |||
2378 | } | |||
2379 | if (Value.isUnion() && Value.getUnionField()) { | |||
2380 | return CheckEvaluationResult( | |||
2381 | CERK, Info, DiagLoc, Value.getUnionField()->getType(), | |||
2382 | Value.getUnionValue(), Kind, Value.getUnionField()->getLocation(), | |||
2383 | CheckedTemps); | |||
2384 | } | |||
2385 | if (Value.isStruct()) { | |||
2386 | RecordDecl *RD = Type->castAs<RecordType>()->getDecl(); | |||
2387 | if (const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD)) { | |||
2388 | unsigned BaseIndex = 0; | |||
2389 | for (const CXXBaseSpecifier &BS : CD->bases()) { | |||
2390 | if (!CheckEvaluationResult(CERK, Info, DiagLoc, BS.getType(), | |||
2391 | Value.getStructBase(BaseIndex), Kind, | |||
2392 | BS.getBeginLoc(), CheckedTemps)) | |||
2393 | return false; | |||
2394 | ++BaseIndex; | |||
2395 | } | |||
2396 | } | |||
2397 | for (const auto *I : RD->fields()) { | |||
2398 | if (I->isUnnamedBitfield()) | |||
2399 | continue; | |||
2400 | ||||
2401 | if (!CheckEvaluationResult(CERK, Info, DiagLoc, I->getType(), | |||
2402 | Value.getStructField(I->getFieldIndex()), | |||
2403 | Kind, I->getLocation(), CheckedTemps)) | |||
2404 | return false; | |||
2405 | } | |||
2406 | } | |||
2407 | ||||
2408 | if (Value.isLValue() && | |||
2409 | CERK == CheckEvaluationResultKind::ConstantExpression) { | |||
2410 | LValue LVal; | |||
2411 | LVal.setFrom(Info.Ctx, Value); | |||
2412 | return CheckLValueConstantExpression(Info, DiagLoc, Type, LVal, Kind, | |||
2413 | CheckedTemps); | |||
2414 | } | |||
2415 | ||||
2416 | if (Value.isMemberPointer() && | |||
2417 | CERK == CheckEvaluationResultKind::ConstantExpression) | |||
2418 | return CheckMemberPointerConstantExpression(Info, DiagLoc, Type, Value, Kind); | |||
2419 | ||||
2420 | // Everything else is fine. | |||
2421 | return true; | |||
2422 | } | |||
2423 | ||||
2424 | /// Check that this core constant expression value is a valid value for a | |||
2425 | /// constant expression. If not, report an appropriate diagnostic. Does not | |||
2426 | /// check that the expression is of literal type. | |||
2427 | static bool CheckConstantExpression(EvalInfo &Info, SourceLocation DiagLoc, | |||
2428 | QualType Type, const APValue &Value, | |||
2429 | ConstantExprKind Kind) { | |||
2430 | // Nothing to check for a constant expression of type 'cv void'. | |||
2431 | if (Type->isVoidType()) | |||
2432 | return true; | |||
2433 | ||||
2434 | CheckedTemporaries CheckedTemps; | |||
2435 | return CheckEvaluationResult(CheckEvaluationResultKind::ConstantExpression, | |||
2436 | Info, DiagLoc, Type, Value, Kind, | |||
2437 | SourceLocation(), CheckedTemps); | |||
2438 | } | |||
2439 | ||||
2440 | /// Check that this evaluated value is fully-initialized and can be loaded by | |||
2441 | /// an lvalue-to-rvalue conversion. | |||
2442 | static bool CheckFullyInitialized(EvalInfo &Info, SourceLocation DiagLoc, | |||
2443 | QualType Type, const APValue &Value) { | |||
2444 | CheckedTemporaries CheckedTemps; | |||
2445 | return CheckEvaluationResult( | |||
2446 | CheckEvaluationResultKind::FullyInitialized, Info, DiagLoc, Type, Value, | |||
2447 | ConstantExprKind::Normal, SourceLocation(), CheckedTemps); | |||
2448 | } | |||
2449 | ||||
2450 | /// Enforce C++2a [expr.const]/4.17, which disallows new-expressions unless | |||
2451 | /// "the allocated storage is deallocated within the evaluation". | |||
2452 | static bool CheckMemoryLeaks(EvalInfo &Info) { | |||
2453 | if (!Info.HeapAllocs.empty()) { | |||
2454 | // We can still fold to a constant despite a compile-time memory leak, | |||
2455 | // so long as the heap allocation isn't referenced in the result (we check | |||
2456 | // that in CheckConstantExpression). | |||
2457 | Info.CCEDiag(Info.HeapAllocs.begin()->second.AllocExpr, | |||
2458 | diag::note_constexpr_memory_leak) | |||
2459 | << unsigned(Info.HeapAllocs.size() - 1); | |||
2460 | } | |||
2461 | return true; | |||
2462 | } | |||
2463 | ||||
2464 | static bool EvalPointerValueAsBool(const APValue &Value, bool &Result) { | |||
2465 | // A null base expression indicates a null pointer. These are always | |||
2466 | // evaluatable, and they are false unless the offset is zero. | |||
2467 | if (!Value.getLValueBase()) { | |||
2468 | Result = !Value.getLValueOffset().isZero(); | |||
2469 | return true; | |||
2470 | } | |||
2471 | ||||
2472 | // We have a non-null base. These are generally known to be true, but if it's | |||
2473 | // a weak declaration it can be null at runtime. | |||
2474 | Result = true; | |||
2475 | const ValueDecl *Decl = Value.getLValueBase().dyn_cast<const ValueDecl*>(); | |||
2476 | return !Decl || !Decl->isWeak(); | |||
2477 | } | |||
2478 | ||||
2479 | static bool HandleConversionToBool(const APValue &Val, bool &Result) { | |||
2480 | switch (Val.getKind()) { | |||
2481 | case APValue::None: | |||
2482 | case APValue::Indeterminate: | |||
2483 | return false; | |||
2484 | case APValue::Int: | |||
2485 | Result = Val.getInt().getBoolValue(); | |||
2486 | return true; | |||
2487 | case APValue::FixedPoint: | |||
2488 | Result = Val.getFixedPoint().getBoolValue(); | |||
2489 | return true; | |||
2490 | case APValue::Float: | |||
2491 | Result = !Val.getFloat().isZero(); | |||
2492 | return true; | |||
2493 | case APValue::ComplexInt: | |||
2494 | Result = Val.getComplexIntReal().getBoolValue() || | |||
2495 | Val.getComplexIntImag().getBoolValue(); | |||
2496 | return true; | |||
2497 | case APValue::ComplexFloat: | |||
2498 | Result = !Val.getComplexFloatReal().isZero() || | |||
2499 | !Val.getComplexFloatImag().isZero(); | |||
2500 | return true; | |||
2501 | case APValue::LValue: | |||
2502 | return EvalPointerValueAsBool(Val, Result); | |||
2503 | case APValue::MemberPointer: | |||
2504 | Result = Val.getMemberPointerDecl(); | |||
2505 | return true; | |||
2506 | case APValue::Vector: | |||
2507 | case APValue::Array: | |||
2508 | case APValue::Struct: | |||
2509 | case APValue::Union: | |||
2510 | case APValue::AddrLabelDiff: | |||
2511 | return false; | |||
2512 | } | |||
2513 | ||||
2514 | llvm_unreachable("unknown APValue kind")::llvm::llvm_unreachable_internal("unknown APValue kind", "clang/lib/AST/ExprConstant.cpp" , 2514); | |||
2515 | } | |||
2516 | ||||
2517 | static bool EvaluateAsBooleanCondition(const Expr *E, bool &Result, | |||
2518 | EvalInfo &Info) { | |||
2519 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 2519, __extension__ __PRETTY_FUNCTION__)); | |||
2520 | assert(E->isPRValue() && "missing lvalue-to-rvalue conv in bool condition")(static_cast <bool> (E->isPRValue() && "missing lvalue-to-rvalue conv in bool condition" ) ? void (0) : __assert_fail ("E->isPRValue() && \"missing lvalue-to-rvalue conv in bool condition\"" , "clang/lib/AST/ExprConstant.cpp", 2520, __extension__ __PRETTY_FUNCTION__ )); | |||
2521 | APValue Val; | |||
2522 | if (!Evaluate(Val, Info, E)) | |||
2523 | return false; | |||
2524 | return HandleConversionToBool(Val, Result); | |||
2525 | } | |||
2526 | ||||
2527 | template<typename T> | |||
2528 | static bool HandleOverflow(EvalInfo &Info, const Expr *E, | |||
2529 | const T &SrcValue, QualType DestType) { | |||
2530 | Info.CCEDiag(E, diag::note_constexpr_overflow) | |||
2531 | << SrcValue << DestType; | |||
2532 | return Info.noteUndefinedBehavior(); | |||
2533 | } | |||
2534 | ||||
2535 | static bool HandleFloatToIntCast(EvalInfo &Info, const Expr *E, | |||
2536 | QualType SrcType, const APFloat &Value, | |||
2537 | QualType DestType, APSInt &Result) { | |||
2538 | unsigned DestWidth = Info.Ctx.getIntWidth(DestType); | |||
2539 | // Determine whether we are converting to unsigned or signed. | |||
2540 | bool DestSigned = DestType->isSignedIntegerOrEnumerationType(); | |||
2541 | ||||
2542 | Result = APSInt(DestWidth, !DestSigned); | |||
2543 | bool ignored; | |||
2544 | if (Value.convertToInteger(Result, llvm::APFloat::rmTowardZero, &ignored) | |||
2545 | & APFloat::opInvalidOp) | |||
2546 | return HandleOverflow(Info, E, Value, DestType); | |||
2547 | return true; | |||
2548 | } | |||
2549 | ||||
2550 | /// Get rounding mode used for evaluation of the specified expression. | |||
2551 | /// \param[out] DynamicRM Is set to true is the requested rounding mode is | |||
2552 | /// dynamic. | |||
2553 | /// If rounding mode is unknown at compile time, still try to evaluate the | |||
2554 | /// expression. If the result is exact, it does not depend on rounding mode. | |||
2555 | /// So return "tonearest" mode instead of "dynamic". | |||
2556 | static llvm::RoundingMode getActiveRoundingMode(EvalInfo &Info, const Expr *E, | |||
2557 | bool &DynamicRM) { | |||
2558 | llvm::RoundingMode RM = | |||
2559 | E->getFPFeaturesInEffect(Info.Ctx.getLangOpts()).getRoundingMode(); | |||
2560 | DynamicRM = (RM == llvm::RoundingMode::Dynamic); | |||
2561 | if (DynamicRM) | |||
2562 | RM = llvm::RoundingMode::NearestTiesToEven; | |||
2563 | return RM; | |||
2564 | } | |||
2565 | ||||
2566 | /// Check if the given evaluation result is allowed for constant evaluation. | |||
2567 | static bool checkFloatingPointResult(EvalInfo &Info, const Expr *E, | |||
2568 | APFloat::opStatus St) { | |||
2569 | // In a constant context, assume that any dynamic rounding mode or FP | |||
2570 | // exception state matches the default floating-point environment. | |||
2571 | if (Info.InConstantContext) | |||
2572 | return true; | |||
2573 | ||||
2574 | FPOptions FPO = E->getFPFeaturesInEffect(Info.Ctx.getLangOpts()); | |||
2575 | if ((St & APFloat::opInexact) && | |||
2576 | FPO.getRoundingMode() == llvm::RoundingMode::Dynamic) { | |||
2577 | // Inexact result means that it depends on rounding mode. If the requested | |||
2578 | // mode is dynamic, the evaluation cannot be made in compile time. | |||
2579 | Info.FFDiag(E, diag::note_constexpr_dynamic_rounding); | |||
2580 | return false; | |||
2581 | } | |||
2582 | ||||
2583 | if ((St != APFloat::opOK) && | |||
2584 | (FPO.getRoundingMode() == llvm::RoundingMode::Dynamic || | |||
2585 | FPO.getFPExceptionMode() != LangOptions::FPE_Ignore || | |||
2586 | FPO.getAllowFEnvAccess())) { | |||
2587 | Info.FFDiag(E, diag::note_constexpr_float_arithmetic_strict); | |||
2588 | return false; | |||
2589 | } | |||
2590 | ||||
2591 | if ((St & APFloat::opStatus::opInvalidOp) && | |||
2592 | FPO.getFPExceptionMode() != LangOptions::FPE_Ignore) { | |||
2593 | // There is no usefully definable result. | |||
2594 | Info.FFDiag(E); | |||
2595 | return false; | |||
2596 | } | |||
2597 | ||||
2598 | // FIXME: if: | |||
2599 | // - evaluation triggered other FP exception, and | |||
2600 | // - exception mode is not "ignore", and | |||
2601 | // - the expression being evaluated is not a part of global variable | |||
2602 | // initializer, | |||
2603 | // the evaluation probably need to be rejected. | |||
2604 | return true; | |||
2605 | } | |||
2606 | ||||
2607 | static bool HandleFloatToFloatCast(EvalInfo &Info, const Expr *E, | |||
2608 | QualType SrcType, QualType DestType, | |||
2609 | APFloat &Result) { | |||
2610 | assert(isa<CastExpr>(E) || isa<CompoundAssignOperator>(E))(static_cast <bool> (isa<CastExpr>(E) || isa<CompoundAssignOperator >(E)) ? void (0) : __assert_fail ("isa<CastExpr>(E) || isa<CompoundAssignOperator>(E)" , "clang/lib/AST/ExprConstant.cpp", 2610, __extension__ __PRETTY_FUNCTION__ )); | |||
2611 | bool DynamicRM; | |||
2612 | llvm::RoundingMode RM = getActiveRoundingMode(Info, E, DynamicRM); | |||
2613 | APFloat::opStatus St; | |||
2614 | APFloat Value = Result; | |||
2615 | bool ignored; | |||
2616 | St = Result.convert(Info.Ctx.getFloatTypeSemantics(DestType), RM, &ignored); | |||
2617 | return checkFloatingPointResult(Info, E, St); | |||
2618 | } | |||
2619 | ||||
2620 | static APSInt HandleIntToIntCast(EvalInfo &Info, const Expr *E, | |||
2621 | QualType DestType, QualType SrcType, | |||
2622 | const APSInt &Value) { | |||
2623 | unsigned DestWidth = Info.Ctx.getIntWidth(DestType); | |||
2624 | // Figure out if this is a truncate, extend or noop cast. | |||
2625 | // If the input is signed, do a sign extend, noop, or truncate. | |||
2626 | APSInt Result = Value.extOrTrunc(DestWidth); | |||
2627 | Result.setIsUnsigned(DestType->isUnsignedIntegerOrEnumerationType()); | |||
2628 | if (DestType->isBooleanType()) | |||
2629 | Result = Value.getBoolValue(); | |||
2630 | return Result; | |||
2631 | } | |||
2632 | ||||
2633 | static bool HandleIntToFloatCast(EvalInfo &Info, const Expr *E, | |||
2634 | const FPOptions FPO, | |||
2635 | QualType SrcType, const APSInt &Value, | |||
2636 | QualType DestType, APFloat &Result) { | |||
2637 | Result = APFloat(Info.Ctx.getFloatTypeSemantics(DestType), 1); | |||
2638 | APFloat::opStatus St = Result.convertFromAPInt(Value, Value.isSigned(), | |||
2639 | APFloat::rmNearestTiesToEven); | |||
2640 | if (!Info.InConstantContext && St != llvm::APFloatBase::opOK && | |||
2641 | FPO.isFPConstrained()) { | |||
2642 | Info.FFDiag(E, diag::note_constexpr_float_arithmetic_strict); | |||
2643 | return false; | |||
2644 | } | |||
2645 | return true; | |||
2646 | } | |||
2647 | ||||
2648 | static bool truncateBitfieldValue(EvalInfo &Info, const Expr *E, | |||
2649 | APValue &Value, const FieldDecl *FD) { | |||
2650 | assert(FD->isBitField() && "truncateBitfieldValue on non-bitfield")(static_cast <bool> (FD->isBitField() && "truncateBitfieldValue on non-bitfield" ) ? void (0) : __assert_fail ("FD->isBitField() && \"truncateBitfieldValue on non-bitfield\"" , "clang/lib/AST/ExprConstant.cpp", 2650, __extension__ __PRETTY_FUNCTION__ )); | |||
2651 | ||||
2652 | if (!Value.isInt()) { | |||
2653 | // Trying to store a pointer-cast-to-integer into a bitfield. | |||
2654 | // FIXME: In this case, we should provide the diagnostic for casting | |||
2655 | // a pointer to an integer. | |||
2656 | assert(Value.isLValue() && "integral value neither int nor lvalue?")(static_cast <bool> (Value.isLValue() && "integral value neither int nor lvalue?" ) ? void (0) : __assert_fail ("Value.isLValue() && \"integral value neither int nor lvalue?\"" , "clang/lib/AST/ExprConstant.cpp", 2656, __extension__ __PRETTY_FUNCTION__ )); | |||
2657 | Info.FFDiag(E); | |||
2658 | return false; | |||
2659 | } | |||
2660 | ||||
2661 | APSInt &Int = Value.getInt(); | |||
2662 | unsigned OldBitWidth = Int.getBitWidth(); | |||
2663 | unsigned NewBitWidth = FD->getBitWidthValue(Info.Ctx); | |||
2664 | if (NewBitWidth < OldBitWidth) | |||
2665 | Int = Int.trunc(NewBitWidth).extend(OldBitWidth); | |||
2666 | return true; | |||
2667 | } | |||
2668 | ||||
2669 | static bool EvalAndBitcastToAPInt(EvalInfo &Info, const Expr *E, | |||
2670 | llvm::APInt &Res) { | |||
2671 | APValue SVal; | |||
2672 | if (!Evaluate(SVal, Info, E)) | |||
2673 | return false; | |||
2674 | if (SVal.isInt()) { | |||
2675 | Res = SVal.getInt(); | |||
2676 | return true; | |||
2677 | } | |||
2678 | if (SVal.isFloat()) { | |||
2679 | Res = SVal.getFloat().bitcastToAPInt(); | |||
2680 | return true; | |||
2681 | } | |||
2682 | if (SVal.isVector()) { | |||
2683 | QualType VecTy = E->getType(); | |||
2684 | unsigned VecSize = Info.Ctx.getTypeSize(VecTy); | |||
2685 | QualType EltTy = VecTy->castAs<VectorType>()->getElementType(); | |||
2686 | unsigned EltSize = Info.Ctx.getTypeSize(EltTy); | |||
2687 | bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); | |||
2688 | Res = llvm::APInt::getZero(VecSize); | |||
2689 | for (unsigned i = 0; i < SVal.getVectorLength(); i++) { | |||
2690 | APValue &Elt = SVal.getVectorElt(i); | |||
2691 | llvm::APInt EltAsInt; | |||
2692 | if (Elt.isInt()) { | |||
2693 | EltAsInt = Elt.getInt(); | |||
2694 | } else if (Elt.isFloat()) { | |||
2695 | EltAsInt = Elt.getFloat().bitcastToAPInt(); | |||
2696 | } else { | |||
2697 | // Don't try to handle vectors of anything other than int or float | |||
2698 | // (not sure if it's possible to hit this case). | |||
2699 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
2700 | return false; | |||
2701 | } | |||
2702 | unsigned BaseEltSize = EltAsInt.getBitWidth(); | |||
2703 | if (BigEndian) | |||
2704 | Res |= EltAsInt.zextOrTrunc(VecSize).rotr(i*EltSize+BaseEltSize); | |||
2705 | else | |||
2706 | Res |= EltAsInt.zextOrTrunc(VecSize).rotl(i*EltSize); | |||
2707 | } | |||
2708 | return true; | |||
2709 | } | |||
2710 | // Give up if the input isn't an int, float, or vector. For example, we | |||
2711 | // reject "(v4i16)(intptr_t)&a". | |||
2712 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
2713 | return false; | |||
2714 | } | |||
2715 | ||||
2716 | /// Perform the given integer operation, which is known to need at most BitWidth | |||
2717 | /// bits, and check for overflow in the original type (if that type was not an | |||
2718 | /// unsigned type). | |||
2719 | template<typename Operation> | |||
2720 | static bool CheckedIntArithmetic(EvalInfo &Info, const Expr *E, | |||
2721 | const APSInt &LHS, const APSInt &RHS, | |||
2722 | unsigned BitWidth, Operation Op, | |||
2723 | APSInt &Result) { | |||
2724 | if (LHS.isUnsigned()) { | |||
2725 | Result = Op(LHS, RHS); | |||
2726 | return true; | |||
2727 | } | |||
2728 | ||||
2729 | APSInt Value(Op(LHS.extend(BitWidth), RHS.extend(BitWidth)), false); | |||
2730 | Result = Value.trunc(LHS.getBitWidth()); | |||
2731 | if (Result.extend(BitWidth) != Value) { | |||
2732 | if (Info.checkingForUndefinedBehavior()) | |||
2733 | Info.Ctx.getDiagnostics().Report(E->getExprLoc(), | |||
2734 | diag::warn_integer_constant_overflow) | |||
2735 | << toString(Result, 10) << E->getType(); | |||
2736 | return HandleOverflow(Info, E, Value, E->getType()); | |||
2737 | } | |||
2738 | return true; | |||
2739 | } | |||
2740 | ||||
2741 | /// Perform the given binary integer operation. | |||
2742 | static bool handleIntIntBinOp(EvalInfo &Info, const Expr *E, const APSInt &LHS, | |||
2743 | BinaryOperatorKind Opcode, APSInt RHS, | |||
2744 | APSInt &Result) { | |||
2745 | switch (Opcode) { | |||
2746 | default: | |||
2747 | Info.FFDiag(E); | |||
2748 | return false; | |||
2749 | case BO_Mul: | |||
2750 | return CheckedIntArithmetic(Info, E, LHS, RHS, LHS.getBitWidth() * 2, | |||
2751 | std::multiplies<APSInt>(), Result); | |||
2752 | case BO_Add: | |||
2753 | return CheckedIntArithmetic(Info, E, LHS, RHS, LHS.getBitWidth() + 1, | |||
2754 | std::plus<APSInt>(), Result); | |||
2755 | case BO_Sub: | |||
2756 | return CheckedIntArithmetic(Info, E, LHS, RHS, LHS.getBitWidth() + 1, | |||
2757 | std::minus<APSInt>(), Result); | |||
2758 | case BO_And: Result = LHS & RHS; return true; | |||
2759 | case BO_Xor: Result = LHS ^ RHS; return true; | |||
2760 | case BO_Or: Result = LHS | RHS; return true; | |||
2761 | case BO_Div: | |||
2762 | case BO_Rem: | |||
2763 | if (RHS == 0) { | |||
2764 | Info.FFDiag(E, diag::note_expr_divide_by_zero); | |||
2765 | return false; | |||
2766 | } | |||
2767 | Result = (Opcode == BO_Rem ? LHS % RHS : LHS / RHS); | |||
2768 | // Check for overflow case: INT_MIN / -1 or INT_MIN % -1. APSInt supports | |||
2769 | // this operation and gives the two's complement result. | |||
2770 | if (RHS.isNegative() && RHS.isAllOnes() && LHS.isSigned() && | |||
2771 | LHS.isMinSignedValue()) | |||
2772 | return HandleOverflow(Info, E, -LHS.extend(LHS.getBitWidth() + 1), | |||
2773 | E->getType()); | |||
2774 | return true; | |||
2775 | case BO_Shl: { | |||
2776 | if (Info.getLangOpts().OpenCL) | |||
2777 | // OpenCL 6.3j: shift values are effectively % word size of LHS. | |||
2778 | RHS &= APSInt(llvm::APInt(RHS.getBitWidth(), | |||
2779 | static_cast<uint64_t>(LHS.getBitWidth() - 1)), | |||
2780 | RHS.isUnsigned()); | |||
2781 | else if (RHS.isSigned() && RHS.isNegative()) { | |||
2782 | // During constant-folding, a negative shift is an opposite shift. Such | |||
2783 | // a shift is not a constant expression. | |||
2784 | Info.CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; | |||
2785 | RHS = -RHS; | |||
2786 | goto shift_right; | |||
2787 | } | |||
2788 | shift_left: | |||
2789 | // C++11 [expr.shift]p1: Shift width must be less than the bit width of | |||
2790 | // the shifted type. | |||
2791 | unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); | |||
2792 | if (SA != RHS) { | |||
2793 | Info.CCEDiag(E, diag::note_constexpr_large_shift) | |||
2794 | << RHS << E->getType() << LHS.getBitWidth(); | |||
2795 | } else if (LHS.isSigned() && !Info.getLangOpts().CPlusPlus20) { | |||
2796 | // C++11 [expr.shift]p2: A signed left shift must have a non-negative | |||
2797 | // operand, and must not overflow the corresponding unsigned type. | |||
2798 | // C++2a [expr.shift]p2: E1 << E2 is the unique value congruent to | |||
2799 | // E1 x 2^E2 module 2^N. | |||
2800 | if (LHS.isNegative()) | |||
2801 | Info.CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS; | |||
2802 | else if (LHS.countLeadingZeros() < SA) | |||
2803 | Info.CCEDiag(E, diag::note_constexpr_lshift_discards); | |||
2804 | } | |||
2805 | Result = LHS << SA; | |||
2806 | return true; | |||
2807 | } | |||
2808 | case BO_Shr: { | |||
2809 | if (Info.getLangOpts().OpenCL) | |||
2810 | // OpenCL 6.3j: shift values are effectively % word size of LHS. | |||
2811 | RHS &= APSInt(llvm::APInt(RHS.getBitWidth(), | |||
2812 | static_cast<uint64_t>(LHS.getBitWidth() - 1)), | |||
2813 | RHS.isUnsigned()); | |||
2814 | else if (RHS.isSigned() && RHS.isNegative()) { | |||
2815 | // During constant-folding, a negative shift is an opposite shift. Such a | |||
2816 | // shift is not a constant expression. | |||
2817 | Info.CCEDiag(E, diag::note_constexpr_negative_shift) << RHS; | |||
2818 | RHS = -RHS; | |||
2819 | goto shift_left; | |||
2820 | } | |||
2821 | shift_right: | |||
2822 | // C++11 [expr.shift]p1: Shift width must be less than the bit width of the | |||
2823 | // shifted type. | |||
2824 | unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1); | |||
2825 | if (SA != RHS) | |||
2826 | Info.CCEDiag(E, diag::note_constexpr_large_shift) | |||
2827 | << RHS << E->getType() << LHS.getBitWidth(); | |||
2828 | Result = LHS >> SA; | |||
2829 | return true; | |||
2830 | } | |||
2831 | ||||
2832 | case BO_LT: Result = LHS < RHS; return true; | |||
2833 | case BO_GT: Result = LHS > RHS; return true; | |||
2834 | case BO_LE: Result = LHS <= RHS; return true; | |||
2835 | case BO_GE: Result = LHS >= RHS; return true; | |||
2836 | case BO_EQ: Result = LHS == RHS; return true; | |||
2837 | case BO_NE: Result = LHS != RHS; return true; | |||
2838 | case BO_Cmp: | |||
2839 | llvm_unreachable("BO_Cmp should be handled elsewhere")::llvm::llvm_unreachable_internal("BO_Cmp should be handled elsewhere" , "clang/lib/AST/ExprConstant.cpp", 2839); | |||
2840 | } | |||
2841 | } | |||
2842 | ||||
2843 | /// Perform the given binary floating-point operation, in-place, on LHS. | |||
2844 | static bool handleFloatFloatBinOp(EvalInfo &Info, const BinaryOperator *E, | |||
2845 | APFloat &LHS, BinaryOperatorKind Opcode, | |||
2846 | const APFloat &RHS) { | |||
2847 | bool DynamicRM; | |||
2848 | llvm::RoundingMode RM = getActiveRoundingMode(Info, E, DynamicRM); | |||
2849 | APFloat::opStatus St; | |||
2850 | switch (Opcode) { | |||
2851 | default: | |||
2852 | Info.FFDiag(E); | |||
2853 | return false; | |||
2854 | case BO_Mul: | |||
2855 | St = LHS.multiply(RHS, RM); | |||
2856 | break; | |||
2857 | case BO_Add: | |||
2858 | St = LHS.add(RHS, RM); | |||
2859 | break; | |||
2860 | case BO_Sub: | |||
2861 | St = LHS.subtract(RHS, RM); | |||
2862 | break; | |||
2863 | case BO_Div: | |||
2864 | // [expr.mul]p4: | |||
2865 | // If the second operand of / or % is zero the behavior is undefined. | |||
2866 | if (RHS.isZero()) | |||
2867 | Info.CCEDiag(E, diag::note_expr_divide_by_zero); | |||
2868 | St = LHS.divide(RHS, RM); | |||
2869 | break; | |||
2870 | } | |||
2871 | ||||
2872 | // [expr.pre]p4: | |||
2873 | // If during the evaluation of an expression, the result is not | |||
2874 | // mathematically defined [...], the behavior is undefined. | |||
2875 | // FIXME: C++ rules require us to not conform to IEEE 754 here. | |||
2876 | if (LHS.isNaN()) { | |||
2877 | Info.CCEDiag(E, diag::note_constexpr_float_arithmetic) << LHS.isNaN(); | |||
2878 | return Info.noteUndefinedBehavior(); | |||
2879 | } | |||
2880 | ||||
2881 | return checkFloatingPointResult(Info, E, St); | |||
2882 | } | |||
2883 | ||||
2884 | static bool handleLogicalOpForVector(const APInt &LHSValue, | |||
2885 | BinaryOperatorKind Opcode, | |||
2886 | const APInt &RHSValue, APInt &Result) { | |||
2887 | bool LHS = (LHSValue != 0); | |||
2888 | bool RHS = (RHSValue != 0); | |||
2889 | ||||
2890 | if (Opcode == BO_LAnd) | |||
2891 | Result = LHS && RHS; | |||
2892 | else | |||
2893 | Result = LHS || RHS; | |||
2894 | return true; | |||
2895 | } | |||
2896 | static bool handleLogicalOpForVector(const APFloat &LHSValue, | |||
2897 | BinaryOperatorKind Opcode, | |||
2898 | const APFloat &RHSValue, APInt &Result) { | |||
2899 | bool LHS = !LHSValue.isZero(); | |||
2900 | bool RHS = !RHSValue.isZero(); | |||
2901 | ||||
2902 | if (Opcode == BO_LAnd) | |||
2903 | Result = LHS && RHS; | |||
2904 | else | |||
2905 | Result = LHS || RHS; | |||
2906 | return true; | |||
2907 | } | |||
2908 | ||||
2909 | static bool handleLogicalOpForVector(const APValue &LHSValue, | |||
2910 | BinaryOperatorKind Opcode, | |||
2911 | const APValue &RHSValue, APInt &Result) { | |||
2912 | // The result is always an int type, however operands match the first. | |||
2913 | if (LHSValue.getKind() == APValue::Int) | |||
2914 | return handleLogicalOpForVector(LHSValue.getInt(), Opcode, | |||
2915 | RHSValue.getInt(), Result); | |||
2916 | assert(LHSValue.getKind() == APValue::Float && "Should be no other options")(static_cast <bool> (LHSValue.getKind() == APValue::Float && "Should be no other options") ? void (0) : __assert_fail ("LHSValue.getKind() == APValue::Float && \"Should be no other options\"" , "clang/lib/AST/ExprConstant.cpp", 2916, __extension__ __PRETTY_FUNCTION__ )); | |||
2917 | return handleLogicalOpForVector(LHSValue.getFloat(), Opcode, | |||
2918 | RHSValue.getFloat(), Result); | |||
2919 | } | |||
2920 | ||||
2921 | template <typename APTy> | |||
2922 | static bool | |||
2923 | handleCompareOpForVectorHelper(const APTy &LHSValue, BinaryOperatorKind Opcode, | |||
2924 | const APTy &RHSValue, APInt &Result) { | |||
2925 | switch (Opcode) { | |||
2926 | default: | |||
2927 | llvm_unreachable("unsupported binary operator")::llvm::llvm_unreachable_internal("unsupported binary operator" , "clang/lib/AST/ExprConstant.cpp", 2927); | |||
2928 | case BO_EQ: | |||
2929 | Result = (LHSValue == RHSValue); | |||
2930 | break; | |||
2931 | case BO_NE: | |||
2932 | Result = (LHSValue != RHSValue); | |||
2933 | break; | |||
2934 | case BO_LT: | |||
2935 | Result = (LHSValue < RHSValue); | |||
2936 | break; | |||
2937 | case BO_GT: | |||
2938 | Result = (LHSValue > RHSValue); | |||
2939 | break; | |||
2940 | case BO_LE: | |||
2941 | Result = (LHSValue <= RHSValue); | |||
2942 | break; | |||
2943 | case BO_GE: | |||
2944 | Result = (LHSValue >= RHSValue); | |||
2945 | break; | |||
2946 | } | |||
2947 | ||||
2948 | // The boolean operations on these vector types use an instruction that | |||
2949 | // results in a mask of '-1' for the 'truth' value. Ensure that we negate 1 | |||
2950 | // to -1 to make sure that we produce the correct value. | |||
2951 | Result.negate(); | |||
2952 | ||||
2953 | return true; | |||
2954 | } | |||
2955 | ||||
2956 | static bool handleCompareOpForVector(const APValue &LHSValue, | |||
2957 | BinaryOperatorKind Opcode, | |||
2958 | const APValue &RHSValue, APInt &Result) { | |||
2959 | // The result is always an int type, however operands match the first. | |||
2960 | if (LHSValue.getKind() == APValue::Int) | |||
2961 | return handleCompareOpForVectorHelper(LHSValue.getInt(), Opcode, | |||
2962 | RHSValue.getInt(), Result); | |||
2963 | assert(LHSValue.getKind() == APValue::Float && "Should be no other options")(static_cast <bool> (LHSValue.getKind() == APValue::Float && "Should be no other options") ? void (0) : __assert_fail ("LHSValue.getKind() == APValue::Float && \"Should be no other options\"" , "clang/lib/AST/ExprConstant.cpp", 2963, __extension__ __PRETTY_FUNCTION__ )); | |||
2964 | return handleCompareOpForVectorHelper(LHSValue.getFloat(), Opcode, | |||
2965 | RHSValue.getFloat(), Result); | |||
2966 | } | |||
2967 | ||||
2968 | // Perform binary operations for vector types, in place on the LHS. | |||
2969 | static bool handleVectorVectorBinOp(EvalInfo &Info, const BinaryOperator *E, | |||
2970 | BinaryOperatorKind Opcode, | |||
2971 | APValue &LHSValue, | |||
2972 | const APValue &RHSValue) { | |||
2973 | assert(Opcode != BO_PtrMemD && Opcode != BO_PtrMemI &&(static_cast <bool> (Opcode != BO_PtrMemD && Opcode != BO_PtrMemI && "Operation not supported on vector types" ) ? void (0) : __assert_fail ("Opcode != BO_PtrMemD && Opcode != BO_PtrMemI && \"Operation not supported on vector types\"" , "clang/lib/AST/ExprConstant.cpp", 2974, __extension__ __PRETTY_FUNCTION__ )) | |||
2974 | "Operation not supported on vector types")(static_cast <bool> (Opcode != BO_PtrMemD && Opcode != BO_PtrMemI && "Operation not supported on vector types" ) ? void (0) : __assert_fail ("Opcode != BO_PtrMemD && Opcode != BO_PtrMemI && \"Operation not supported on vector types\"" , "clang/lib/AST/ExprConstant.cpp", 2974, __extension__ __PRETTY_FUNCTION__ )); | |||
2975 | ||||
2976 | const auto *VT = E->getType()->castAs<VectorType>(); | |||
2977 | unsigned NumElements = VT->getNumElements(); | |||
2978 | QualType EltTy = VT->getElementType(); | |||
2979 | ||||
2980 | // In the cases (typically C as I've observed) where we aren't evaluating | |||
2981 | // constexpr but are checking for cases where the LHS isn't yet evaluatable, | |||
2982 | // just give up. | |||
2983 | if (!LHSValue.isVector()) { | |||
2984 | assert(LHSValue.isLValue() &&(static_cast <bool> (LHSValue.isLValue() && "A vector result that isn't a vector OR uncalculated LValue" ) ? void (0) : __assert_fail ("LHSValue.isLValue() && \"A vector result that isn't a vector OR uncalculated LValue\"" , "clang/lib/AST/ExprConstant.cpp", 2985, __extension__ __PRETTY_FUNCTION__ )) | |||
2985 | "A vector result that isn't a vector OR uncalculated LValue")(static_cast <bool> (LHSValue.isLValue() && "A vector result that isn't a vector OR uncalculated LValue" ) ? void (0) : __assert_fail ("LHSValue.isLValue() && \"A vector result that isn't a vector OR uncalculated LValue\"" , "clang/lib/AST/ExprConstant.cpp", 2985, __extension__ __PRETTY_FUNCTION__ )); | |||
2986 | Info.FFDiag(E); | |||
2987 | return false; | |||
2988 | } | |||
2989 | ||||
2990 | assert(LHSValue.getVectorLength() == NumElements &&(static_cast <bool> (LHSValue.getVectorLength() == NumElements && RHSValue.getVectorLength() == NumElements && "Different vector sizes") ? void (0) : __assert_fail ("LHSValue.getVectorLength() == NumElements && RHSValue.getVectorLength() == NumElements && \"Different vector sizes\"" , "clang/lib/AST/ExprConstant.cpp", 2991, __extension__ __PRETTY_FUNCTION__ )) | |||
2991 | RHSValue.getVectorLength() == NumElements && "Different vector sizes")(static_cast <bool> (LHSValue.getVectorLength() == NumElements && RHSValue.getVectorLength() == NumElements && "Different vector sizes") ? void (0) : __assert_fail ("LHSValue.getVectorLength() == NumElements && RHSValue.getVectorLength() == NumElements && \"Different vector sizes\"" , "clang/lib/AST/ExprConstant.cpp", 2991, __extension__ __PRETTY_FUNCTION__ )); | |||
2992 | ||||
2993 | SmallVector<APValue, 4> ResultElements; | |||
2994 | ||||
2995 | for (unsigned EltNum = 0; EltNum < NumElements; ++EltNum) { | |||
2996 | APValue LHSElt = LHSValue.getVectorElt(EltNum); | |||
2997 | APValue RHSElt = RHSValue.getVectorElt(EltNum); | |||
2998 | ||||
2999 | if (EltTy->isIntegerType()) { | |||
3000 | APSInt EltResult{Info.Ctx.getIntWidth(EltTy), | |||
3001 | EltTy->isUnsignedIntegerType()}; | |||
3002 | bool Success = true; | |||
3003 | ||||
3004 | if (BinaryOperator::isLogicalOp(Opcode)) | |||
3005 | Success = handleLogicalOpForVector(LHSElt, Opcode, RHSElt, EltResult); | |||
3006 | else if (BinaryOperator::isComparisonOp(Opcode)) | |||
3007 | Success = handleCompareOpForVector(LHSElt, Opcode, RHSElt, EltResult); | |||
3008 | else | |||
3009 | Success = handleIntIntBinOp(Info, E, LHSElt.getInt(), Opcode, | |||
3010 | RHSElt.getInt(), EltResult); | |||
3011 | ||||
3012 | if (!Success) { | |||
3013 | Info.FFDiag(E); | |||
3014 | return false; | |||
3015 | } | |||
3016 | ResultElements.emplace_back(EltResult); | |||
3017 | ||||
3018 | } else if (EltTy->isFloatingType()) { | |||
3019 | assert(LHSElt.getKind() == APValue::Float &&(static_cast <bool> (LHSElt.getKind() == APValue::Float && RHSElt.getKind() == APValue::Float && "Mismatched LHS/RHS/Result Type" ) ? void (0) : __assert_fail ("LHSElt.getKind() == APValue::Float && RHSElt.getKind() == APValue::Float && \"Mismatched LHS/RHS/Result Type\"" , "clang/lib/AST/ExprConstant.cpp", 3021, __extension__ __PRETTY_FUNCTION__ )) | |||
3020 | RHSElt.getKind() == APValue::Float &&(static_cast <bool> (LHSElt.getKind() == APValue::Float && RHSElt.getKind() == APValue::Float && "Mismatched LHS/RHS/Result Type" ) ? void (0) : __assert_fail ("LHSElt.getKind() == APValue::Float && RHSElt.getKind() == APValue::Float && \"Mismatched LHS/RHS/Result Type\"" , "clang/lib/AST/ExprConstant.cpp", 3021, __extension__ __PRETTY_FUNCTION__ )) | |||
3021 | "Mismatched LHS/RHS/Result Type")(static_cast <bool> (LHSElt.getKind() == APValue::Float && RHSElt.getKind() == APValue::Float && "Mismatched LHS/RHS/Result Type" ) ? void (0) : __assert_fail ("LHSElt.getKind() == APValue::Float && RHSElt.getKind() == APValue::Float && \"Mismatched LHS/RHS/Result Type\"" , "clang/lib/AST/ExprConstant.cpp", 3021, __extension__ __PRETTY_FUNCTION__ )); | |||
3022 | APFloat LHSFloat = LHSElt.getFloat(); | |||
3023 | ||||
3024 | if (!handleFloatFloatBinOp(Info, E, LHSFloat, Opcode, | |||
3025 | RHSElt.getFloat())) { | |||
3026 | Info.FFDiag(E); | |||
3027 | return false; | |||
3028 | } | |||
3029 | ||||
3030 | ResultElements.emplace_back(LHSFloat); | |||
3031 | } | |||
3032 | } | |||
3033 | ||||
3034 | LHSValue = APValue(ResultElements.data(), ResultElements.size()); | |||
3035 | return true; | |||
3036 | } | |||
3037 | ||||
3038 | /// Cast an lvalue referring to a base subobject to a derived class, by | |||
3039 | /// truncating the lvalue's path to the given length. | |||
3040 | static bool CastToDerivedClass(EvalInfo &Info, const Expr *E, LValue &Result, | |||
3041 | const RecordDecl *TruncatedType, | |||
3042 | unsigned TruncatedElements) { | |||
3043 | SubobjectDesignator &D = Result.Designator; | |||
3044 | ||||
3045 | // Check we actually point to a derived class object. | |||
3046 | if (TruncatedElements == D.Entries.size()) | |||
3047 | return true; | |||
3048 | assert(TruncatedElements >= D.MostDerivedPathLength &&(static_cast <bool> (TruncatedElements >= D.MostDerivedPathLength && "not casting to a derived class") ? void (0) : __assert_fail ("TruncatedElements >= D.MostDerivedPathLength && \"not casting to a derived class\"" , "clang/lib/AST/ExprConstant.cpp", 3049, __extension__ __PRETTY_FUNCTION__ )) | |||
3049 | "not casting to a derived class")(static_cast <bool> (TruncatedElements >= D.MostDerivedPathLength && "not casting to a derived class") ? void (0) : __assert_fail ("TruncatedElements >= D.MostDerivedPathLength && \"not casting to a derived class\"" , "clang/lib/AST/ExprConstant.cpp", 3049, __extension__ __PRETTY_FUNCTION__ )); | |||
3050 | if (!Result.checkSubobject(Info, E, CSK_Derived)) | |||
3051 | return false; | |||
3052 | ||||
3053 | // Truncate the path to the subobject, and remove any derived-to-base offsets. | |||
3054 | const RecordDecl *RD = TruncatedType; | |||
3055 | for (unsigned I = TruncatedElements, N = D.Entries.size(); I != N; ++I) { | |||
3056 | if (RD->isInvalidDecl()) return false; | |||
3057 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | |||
3058 | const CXXRecordDecl *Base = getAsBaseClass(D.Entries[I]); | |||
3059 | if (isVirtualBaseClass(D.Entries[I])) | |||
3060 | Result.Offset -= Layout.getVBaseClassOffset(Base); | |||
3061 | else | |||
3062 | Result.Offset -= Layout.getBaseClassOffset(Base); | |||
3063 | RD = Base; | |||
3064 | } | |||
3065 | D.Entries.resize(TruncatedElements); | |||
3066 | return true; | |||
3067 | } | |||
3068 | ||||
3069 | static bool HandleLValueDirectBase(EvalInfo &Info, const Expr *E, LValue &Obj, | |||
3070 | const CXXRecordDecl *Derived, | |||
3071 | const CXXRecordDecl *Base, | |||
3072 | const ASTRecordLayout *RL = nullptr) { | |||
3073 | if (!RL) { | |||
3074 | if (Derived->isInvalidDecl()) return false; | |||
3075 | RL = &Info.Ctx.getASTRecordLayout(Derived); | |||
3076 | } | |||
3077 | ||||
3078 | Obj.getLValueOffset() += RL->getBaseClassOffset(Base); | |||
3079 | Obj.addDecl(Info, E, Base, /*Virtual*/ false); | |||
3080 | return true; | |||
3081 | } | |||
3082 | ||||
3083 | static bool HandleLValueBase(EvalInfo &Info, const Expr *E, LValue &Obj, | |||
3084 | const CXXRecordDecl *DerivedDecl, | |||
3085 | const CXXBaseSpecifier *Base) { | |||
3086 | const CXXRecordDecl *BaseDecl = Base->getType()->getAsCXXRecordDecl(); | |||
3087 | ||||
3088 | if (!Base->isVirtual()) | |||
3089 | return HandleLValueDirectBase(Info, E, Obj, DerivedDecl, BaseDecl); | |||
3090 | ||||
3091 | SubobjectDesignator &D = Obj.Designator; | |||
3092 | if (D.Invalid) | |||
3093 | return false; | |||
3094 | ||||
3095 | // Extract most-derived object and corresponding type. | |||
3096 | DerivedDecl = D.MostDerivedType->getAsCXXRecordDecl(); | |||
3097 | if (!CastToDerivedClass(Info, E, Obj, DerivedDecl, D.MostDerivedPathLength)) | |||
3098 | return false; | |||
3099 | ||||
3100 | // Find the virtual base class. | |||
3101 | if (DerivedDecl->isInvalidDecl()) return false; | |||
3102 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(DerivedDecl); | |||
3103 | Obj.getLValueOffset() += Layout.getVBaseClassOffset(BaseDecl); | |||
3104 | Obj.addDecl(Info, E, BaseDecl, /*Virtual*/ true); | |||
3105 | return true; | |||
3106 | } | |||
3107 | ||||
3108 | static bool HandleLValueBasePath(EvalInfo &Info, const CastExpr *E, | |||
3109 | QualType Type, LValue &Result) { | |||
3110 | for (CastExpr::path_const_iterator PathI = E->path_begin(), | |||
3111 | PathE = E->path_end(); | |||
3112 | PathI != PathE; ++PathI) { | |||
3113 | if (!HandleLValueBase(Info, E, Result, Type->getAsCXXRecordDecl(), | |||
3114 | *PathI)) | |||
3115 | return false; | |||
3116 | Type = (*PathI)->getType(); | |||
3117 | } | |||
3118 | return true; | |||
3119 | } | |||
3120 | ||||
3121 | /// Cast an lvalue referring to a derived class to a known base subobject. | |||
3122 | static bool CastToBaseClass(EvalInfo &Info, const Expr *E, LValue &Result, | |||
3123 | const CXXRecordDecl *DerivedRD, | |||
3124 | const CXXRecordDecl *BaseRD) { | |||
3125 | CXXBasePaths Paths(/*FindAmbiguities=*/false, | |||
3126 | /*RecordPaths=*/true, /*DetectVirtual=*/false); | |||
3127 | if (!DerivedRD->isDerivedFrom(BaseRD, Paths)) | |||
3128 | 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!" , "clang/lib/AST/ExprConstant.cpp", 3128); | |||
3129 | ||||
3130 | for (CXXBasePathElement &Elem : Paths.front()) | |||
3131 | if (!HandleLValueBase(Info, E, Result, Elem.Class, Elem.Base)) | |||
3132 | return false; | |||
3133 | return true; | |||
3134 | } | |||
3135 | ||||
3136 | /// Update LVal to refer to the given field, which must be a member of the type | |||
3137 | /// currently described by LVal. | |||
3138 | static bool HandleLValueMember(EvalInfo &Info, const Expr *E, LValue &LVal, | |||
3139 | const FieldDecl *FD, | |||
3140 | const ASTRecordLayout *RL = nullptr) { | |||
3141 | if (!RL) { | |||
3142 | if (FD->getParent()->isInvalidDecl()) return false; | |||
3143 | RL = &Info.Ctx.getASTRecordLayout(FD->getParent()); | |||
3144 | } | |||
3145 | ||||
3146 | unsigned I = FD->getFieldIndex(); | |||
3147 | LVal.adjustOffset(Info.Ctx.toCharUnitsFromBits(RL->getFieldOffset(I))); | |||
3148 | LVal.addDecl(Info, E, FD); | |||
3149 | return true; | |||
3150 | } | |||
3151 | ||||
3152 | /// Update LVal to refer to the given indirect field. | |||
3153 | static bool HandleLValueIndirectMember(EvalInfo &Info, const Expr *E, | |||
3154 | LValue &LVal, | |||
3155 | const IndirectFieldDecl *IFD) { | |||
3156 | for (const auto *C : IFD->chain()) | |||
3157 | if (!HandleLValueMember(Info, E, LVal, cast<FieldDecl>(C))) | |||
3158 | return false; | |||
3159 | return true; | |||
3160 | } | |||
3161 | ||||
3162 | /// Get the size of the given type in char units. | |||
3163 | static bool HandleSizeof(EvalInfo &Info, SourceLocation Loc, | |||
3164 | QualType Type, CharUnits &Size) { | |||
3165 | // sizeof(void), __alignof__(void), sizeof(function) = 1 as a gcc | |||
3166 | // extension. | |||
3167 | if (Type->isVoidType() || Type->isFunctionType()) { | |||
3168 | Size = CharUnits::One(); | |||
3169 | return true; | |||
3170 | } | |||
3171 | ||||
3172 | if (Type->isDependentType()) { | |||
3173 | Info.FFDiag(Loc); | |||
3174 | return false; | |||
3175 | } | |||
3176 | ||||
3177 | if (!Type->isConstantSizeType()) { | |||
3178 | // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. | |||
3179 | // FIXME: Better diagnostic. | |||
3180 | Info.FFDiag(Loc); | |||
3181 | return false; | |||
3182 | } | |||
3183 | ||||
3184 | Size = Info.Ctx.getTypeSizeInChars(Type); | |||
3185 | return true; | |||
3186 | } | |||
3187 | ||||
3188 | /// Update a pointer value to model pointer arithmetic. | |||
3189 | /// \param Info - Information about the ongoing evaluation. | |||
3190 | /// \param E - The expression being evaluated, for diagnostic purposes. | |||
3191 | /// \param LVal - The pointer value to be updated. | |||
3192 | /// \param EltTy - The pointee type represented by LVal. | |||
3193 | /// \param Adjustment - The adjustment, in objects of type EltTy, to add. | |||
3194 | static bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, | |||
3195 | LValue &LVal, QualType EltTy, | |||
3196 | APSInt Adjustment) { | |||
3197 | CharUnits SizeOfPointee; | |||
3198 | if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfPointee)) | |||
3199 | return false; | |||
3200 | ||||
3201 | LVal.adjustOffsetAndIndex(Info, E, Adjustment, SizeOfPointee); | |||
3202 | return true; | |||
3203 | } | |||
3204 | ||||
3205 | static bool HandleLValueArrayAdjustment(EvalInfo &Info, const Expr *E, | |||
3206 | LValue &LVal, QualType EltTy, | |||
3207 | int64_t Adjustment) { | |||
3208 | return HandleLValueArrayAdjustment(Info, E, LVal, EltTy, | |||
3209 | APSInt::get(Adjustment)); | |||
3210 | } | |||
3211 | ||||
3212 | /// Update an lvalue to refer to a component of a complex number. | |||
3213 | /// \param Info - Information about the ongoing evaluation. | |||
3214 | /// \param LVal - The lvalue to be updated. | |||
3215 | /// \param EltTy - The complex number's component type. | |||
3216 | /// \param Imag - False for the real component, true for the imaginary. | |||
3217 | static bool HandleLValueComplexElement(EvalInfo &Info, const Expr *E, | |||
3218 | LValue &LVal, QualType EltTy, | |||
3219 | bool Imag) { | |||
3220 | if (Imag) { | |||
3221 | CharUnits SizeOfComponent; | |||
3222 | if (!HandleSizeof(Info, E->getExprLoc(), EltTy, SizeOfComponent)) | |||
3223 | return false; | |||
3224 | LVal.Offset += SizeOfComponent; | |||
3225 | } | |||
3226 | LVal.addComplex(Info, E, EltTy, Imag); | |||
3227 | return true; | |||
3228 | } | |||
3229 | ||||
3230 | /// Try to evaluate the initializer for a variable declaration. | |||
3231 | /// | |||
3232 | /// \param Info Information about the ongoing evaluation. | |||
3233 | /// \param E An expression to be used when printing diagnostics. | |||
3234 | /// \param VD The variable whose initializer should be obtained. | |||
3235 | /// \param Version The version of the variable within the frame. | |||
3236 | /// \param Frame The frame in which the variable was created. Must be null | |||
3237 | /// if this variable is not local to the evaluation. | |||
3238 | /// \param Result Filled in with a pointer to the value of the variable. | |||
3239 | static bool evaluateVarDeclInit(EvalInfo &Info, const Expr *E, | |||
3240 | const VarDecl *VD, CallStackFrame *Frame, | |||
3241 | unsigned Version, APValue *&Result) { | |||
3242 | APValue::LValueBase Base(VD, Frame ? Frame->Index : 0, Version); | |||
3243 | ||||
3244 | // If this is a local variable, dig out its value. | |||
3245 | if (Frame) { | |||
3246 | Result = Frame->getTemporary(VD, Version); | |||
3247 | if (Result) | |||
3248 | return true; | |||
3249 | ||||
3250 | if (!isa<ParmVarDecl>(VD)) { | |||
3251 | // Assume variables referenced within a lambda's call operator that were | |||
3252 | // not declared within the call operator are captures and during checking | |||
3253 | // of a potential constant expression, assume they are unknown constant | |||
3254 | // expressions. | |||
3255 | assert(isLambdaCallOperator(Frame->Callee) &&(static_cast <bool> (isLambdaCallOperator(Frame->Callee ) && (VD->getDeclContext() != Frame->Callee || VD ->isInitCapture()) && "missing value for local variable" ) ? void (0) : __assert_fail ("isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) && \"missing value for local variable\"" , "clang/lib/AST/ExprConstant.cpp", 3257, __extension__ __PRETTY_FUNCTION__ )) | |||
3256 | (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) &&(static_cast <bool> (isLambdaCallOperator(Frame->Callee ) && (VD->getDeclContext() != Frame->Callee || VD ->isInitCapture()) && "missing value for local variable" ) ? void (0) : __assert_fail ("isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) && \"missing value for local variable\"" , "clang/lib/AST/ExprConstant.cpp", 3257, __extension__ __PRETTY_FUNCTION__ )) | |||
3257 | "missing value for local variable")(static_cast <bool> (isLambdaCallOperator(Frame->Callee ) && (VD->getDeclContext() != Frame->Callee || VD ->isInitCapture()) && "missing value for local variable" ) ? void (0) : __assert_fail ("isLambdaCallOperator(Frame->Callee) && (VD->getDeclContext() != Frame->Callee || VD->isInitCapture()) && \"missing value for local variable\"" , "clang/lib/AST/ExprConstant.cpp", 3257, __extension__ __PRETTY_FUNCTION__ )); | |||
3258 | if (Info.checkingPotentialConstantExpression()) | |||
3259 | return false; | |||
3260 | // FIXME: This diagnostic is bogus; we do support captures. Is this code | |||
3261 | // still reachable at all? | |||
3262 | Info.FFDiag(E->getBeginLoc(), | |||
3263 | diag::note_unimplemented_constexpr_lambda_feature_ast) | |||
3264 | << "captures not currently allowed"; | |||
3265 | return false; | |||
3266 | } | |||
3267 | } | |||
3268 | ||||
3269 | // If we're currently evaluating the initializer of this declaration, use that | |||
3270 | // in-flight value. | |||
3271 | if (Info.EvaluatingDecl == Base) { | |||
3272 | Result = Info.EvaluatingDeclValue; | |||
3273 | return true; | |||
3274 | } | |||
3275 | ||||
3276 | if (isa<ParmVarDecl>(VD)) { | |||
3277 | // Assume parameters of a potential constant expression are usable in | |||
3278 | // constant expressions. | |||
3279 | if (!Info.checkingPotentialConstantExpression() || | |||
3280 | !Info.CurrentCall->Callee || | |||
3281 | !Info.CurrentCall->Callee->Equals(VD->getDeclContext())) { | |||
3282 | if (Info.getLangOpts().CPlusPlus11) { | |||
3283 | Info.FFDiag(E, diag::note_constexpr_function_param_value_unknown) | |||
3284 | << VD; | |||
3285 | NoteLValueLocation(Info, Base); | |||
3286 | } else { | |||
3287 | Info.FFDiag(E); | |||
3288 | } | |||
3289 | } | |||
3290 | return false; | |||
3291 | } | |||
3292 | ||||
3293 | // Dig out the initializer, and use the declaration which it's attached to. | |||
3294 | // FIXME: We should eventually check whether the variable has a reachable | |||
3295 | // initializing declaration. | |||
3296 | const Expr *Init = VD->getAnyInitializer(VD); | |||
3297 | if (!Init) { | |||
3298 | // Don't diagnose during potential constant expression checking; an | |||
3299 | // initializer might be added later. | |||
3300 | if (!Info.checkingPotentialConstantExpression()) { | |||
3301 | Info.FFDiag(E, diag::note_constexpr_var_init_unknown, 1) | |||
3302 | << VD; | |||
3303 | NoteLValueLocation(Info, Base); | |||
3304 | } | |||
3305 | return false; | |||
3306 | } | |||
3307 | ||||
3308 | if (Init->isValueDependent()) { | |||
3309 | // The DeclRefExpr is not value-dependent, but the variable it refers to | |||
3310 | // has a value-dependent initializer. This should only happen in | |||
3311 | // constant-folding cases, where the variable is not actually of a suitable | |||
3312 | // type for use in a constant expression (otherwise the DeclRefExpr would | |||
3313 | // have been value-dependent too), so diagnose that. | |||
3314 | assert(!VD->mightBeUsableInConstantExpressions(Info.Ctx))(static_cast <bool> (!VD->mightBeUsableInConstantExpressions (Info.Ctx)) ? void (0) : __assert_fail ("!VD->mightBeUsableInConstantExpressions(Info.Ctx)" , "clang/lib/AST/ExprConstant.cpp", 3314, __extension__ __PRETTY_FUNCTION__ )); | |||
3315 | if (!Info.checkingPotentialConstantExpression()) { | |||
3316 | Info.FFDiag(E, Info.getLangOpts().CPlusPlus11 | |||
3317 | ? diag::note_constexpr_ltor_non_constexpr | |||
3318 | : diag::note_constexpr_ltor_non_integral, 1) | |||
3319 | << VD << VD->getType(); | |||
3320 | NoteLValueLocation(Info, Base); | |||
3321 | } | |||
3322 | return false; | |||
3323 | } | |||
3324 | ||||
3325 | // Check that we can fold the initializer. In C++, we will have already done | |||
3326 | // this in the cases where it matters for conformance. | |||
3327 | if (!VD->evaluateValue()) { | |||
3328 | Info.FFDiag(E, diag::note_constexpr_var_init_non_constant, 1) << VD; | |||
3329 | NoteLValueLocation(Info, Base); | |||
3330 | return false; | |||
3331 | } | |||
3332 | ||||
3333 | // Check that the variable is actually usable in constant expressions. For a | |||
3334 | // const integral variable or a reference, we might have a non-constant | |||
3335 | // initializer that we can nonetheless evaluate the initializer for. Such | |||
3336 | // variables are not usable in constant expressions. In C++98, the | |||
3337 | // initializer also syntactically needs to be an ICE. | |||
3338 | // | |||
3339 | // FIXME: We don't diagnose cases that aren't potentially usable in constant | |||
3340 | // expressions here; doing so would regress diagnostics for things like | |||
3341 | // reading from a volatile constexpr variable. | |||
3342 | if ((Info.getLangOpts().CPlusPlus && !VD->hasConstantInitialization() && | |||
3343 | VD->mightBeUsableInConstantExpressions(Info.Ctx)) || | |||
3344 | ((Info.getLangOpts().CPlusPlus || Info.getLangOpts().OpenCL) && | |||
3345 | !Info.getLangOpts().CPlusPlus11 && !VD->hasICEInitializer(Info.Ctx))) { | |||
3346 | Info.CCEDiag(E, diag::note_constexpr_var_init_non_constant, 1) << VD; | |||
3347 | NoteLValueLocation(Info, Base); | |||
3348 | } | |||
3349 | ||||
3350 | // Never use the initializer of a weak variable, not even for constant | |||
3351 | // folding. We can't be sure that this is the definition that will be used. | |||
3352 | if (VD->isWeak()) { | |||
3353 | Info.FFDiag(E, diag::note_constexpr_var_init_weak) << VD; | |||
3354 | NoteLValueLocation(Info, Base); | |||
3355 | return false; | |||
3356 | } | |||
3357 | ||||
3358 | Result = VD->getEvaluatedValue(); | |||
3359 | return true; | |||
3360 | } | |||
3361 | ||||
3362 | /// Get the base index of the given base class within an APValue representing | |||
3363 | /// the given derived class. | |||
3364 | static unsigned getBaseIndex(const CXXRecordDecl *Derived, | |||
3365 | const CXXRecordDecl *Base) { | |||
3366 | Base = Base->getCanonicalDecl(); | |||
3367 | unsigned Index = 0; | |||
3368 | for (CXXRecordDecl::base_class_const_iterator I = Derived->bases_begin(), | |||
3369 | E = Derived->bases_end(); I != E; ++I, ++Index) { | |||
3370 | if (I->getType()->getAsCXXRecordDecl()->getCanonicalDecl() == Base) | |||
3371 | return Index; | |||
3372 | } | |||
3373 | ||||
3374 | llvm_unreachable("base class missing from derived class's bases list")::llvm::llvm_unreachable_internal("base class missing from derived class's bases list" , "clang/lib/AST/ExprConstant.cpp", 3374); | |||
3375 | } | |||
3376 | ||||
3377 | /// Extract the value of a character from a string literal. | |||
3378 | static APSInt extractStringLiteralCharacter(EvalInfo &Info, const Expr *Lit, | |||
3379 | uint64_t Index) { | |||
3380 | assert(!isa<SourceLocExpr>(Lit) &&(static_cast <bool> (!isa<SourceLocExpr>(Lit) && "SourceLocExpr should have already been converted to a StringLiteral" ) ? void (0) : __assert_fail ("!isa<SourceLocExpr>(Lit) && \"SourceLocExpr should have already been converted to a StringLiteral\"" , "clang/lib/AST/ExprConstant.cpp", 3381, __extension__ __PRETTY_FUNCTION__ )) | |||
3381 | "SourceLocExpr should have already been converted to a StringLiteral")(static_cast <bool> (!isa<SourceLocExpr>(Lit) && "SourceLocExpr should have already been converted to a StringLiteral" ) ? void (0) : __assert_fail ("!isa<SourceLocExpr>(Lit) && \"SourceLocExpr should have already been converted to a StringLiteral\"" , "clang/lib/AST/ExprConstant.cpp", 3381, __extension__ __PRETTY_FUNCTION__ )); | |||
3382 | ||||
3383 | // FIXME: Support MakeStringConstant | |||
3384 | if (const auto *ObjCEnc = dyn_cast<ObjCEncodeExpr>(Lit)) { | |||
3385 | std::string Str; | |||
3386 | Info.Ctx.getObjCEncodingForType(ObjCEnc->getEncodedType(), Str); | |||
3387 | assert(Index <= Str.size() && "Index too large")(static_cast <bool> (Index <= Str.size() && "Index too large" ) ? void (0) : __assert_fail ("Index <= Str.size() && \"Index too large\"" , "clang/lib/AST/ExprConstant.cpp", 3387, __extension__ __PRETTY_FUNCTION__ )); | |||
3388 | return APSInt::getUnsigned(Str.c_str()[Index]); | |||
3389 | } | |||
3390 | ||||
3391 | if (auto PE = dyn_cast<PredefinedExpr>(Lit)) | |||
3392 | Lit = PE->getFunctionName(); | |||
3393 | const StringLiteral *S = cast<StringLiteral>(Lit); | |||
3394 | const ConstantArrayType *CAT = | |||
3395 | Info.Ctx.getAsConstantArrayType(S->getType()); | |||
3396 | assert(CAT && "string literal isn't an array")(static_cast <bool> (CAT && "string literal isn't an array" ) ? void (0) : __assert_fail ("CAT && \"string literal isn't an array\"" , "clang/lib/AST/ExprConstant.cpp", 3396, __extension__ __PRETTY_FUNCTION__ )); | |||
3397 | QualType CharType = CAT->getElementType(); | |||
3398 | assert(CharType->isIntegerType() && "unexpected character type")(static_cast <bool> (CharType->isIntegerType() && "unexpected character type") ? void (0) : __assert_fail ("CharType->isIntegerType() && \"unexpected character type\"" , "clang/lib/AST/ExprConstant.cpp", 3398, __extension__ __PRETTY_FUNCTION__ )); | |||
3399 | ||||
3400 | APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), | |||
3401 | CharType->isUnsignedIntegerType()); | |||
3402 | if (Index < S->getLength()) | |||
3403 | Value = S->getCodeUnit(Index); | |||
3404 | return Value; | |||
3405 | } | |||
3406 | ||||
3407 | // Expand a string literal into an array of characters. | |||
3408 | // | |||
3409 | // FIXME: This is inefficient; we should probably introduce something similar | |||
3410 | // to the LLVM ConstantDataArray to make this cheaper. | |||
3411 | static void expandStringLiteral(EvalInfo &Info, const StringLiteral *S, | |||
3412 | APValue &Result, | |||
3413 | QualType AllocType = QualType()) { | |||
3414 | const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType( | |||
3415 | AllocType.isNull() ? S->getType() : AllocType); | |||
3416 | assert(CAT && "string literal isn't an array")(static_cast <bool> (CAT && "string literal isn't an array" ) ? void (0) : __assert_fail ("CAT && \"string literal isn't an array\"" , "clang/lib/AST/ExprConstant.cpp", 3416, __extension__ __PRETTY_FUNCTION__ )); | |||
3417 | QualType CharType = CAT->getElementType(); | |||
3418 | assert(CharType->isIntegerType() && "unexpected character type")(static_cast <bool> (CharType->isIntegerType() && "unexpected character type") ? void (0) : __assert_fail ("CharType->isIntegerType() && \"unexpected character type\"" , "clang/lib/AST/ExprConstant.cpp", 3418, __extension__ __PRETTY_FUNCTION__ )); | |||
3419 | ||||
3420 | unsigned Elts = CAT->getSize().getZExtValue(); | |||
3421 | Result = APValue(APValue::UninitArray(), | |||
3422 | std::min(S->getLength(), Elts), Elts); | |||
3423 | APSInt Value(S->getCharByteWidth() * Info.Ctx.getCharWidth(), | |||
3424 | CharType->isUnsignedIntegerType()); | |||
3425 | if (Result.hasArrayFiller()) | |||
3426 | Result.getArrayFiller() = APValue(Value); | |||
3427 | for (unsigned I = 0, N = Result.getArrayInitializedElts(); I != N; ++I) { | |||
3428 | Value = S->getCodeUnit(I); | |||
3429 | Result.getArrayInitializedElt(I) = APValue(Value); | |||
3430 | } | |||
3431 | } | |||
3432 | ||||
3433 | // Expand an array so that it has more than Index filled elements. | |||
3434 | static void expandArray(APValue &Array, unsigned Index) { | |||
3435 | unsigned Size = Array.getArraySize(); | |||
3436 | assert(Index < Size)(static_cast <bool> (Index < Size) ? void (0) : __assert_fail ("Index < Size", "clang/lib/AST/ExprConstant.cpp", 3436, __extension__ __PRETTY_FUNCTION__)); | |||
3437 | ||||
3438 | // Always at least double the number of elements for which we store a value. | |||
3439 | unsigned OldElts = Array.getArrayInitializedElts(); | |||
3440 | unsigned NewElts = std::max(Index+1, OldElts * 2); | |||
3441 | NewElts = std::min(Size, std::max(NewElts, 8u)); | |||
3442 | ||||
3443 | // Copy the data across. | |||
3444 | APValue NewValue(APValue::UninitArray(), NewElts, Size); | |||
3445 | for (unsigned I = 0; I != OldElts; ++I) | |||
3446 | NewValue.getArrayInitializedElt(I).swap(Array.getArrayInitializedElt(I)); | |||
3447 | for (unsigned I = OldElts; I != NewElts; ++I) | |||
3448 | NewValue.getArrayInitializedElt(I) = Array.getArrayFiller(); | |||
3449 | if (NewValue.hasArrayFiller()) | |||
3450 | NewValue.getArrayFiller() = Array.getArrayFiller(); | |||
3451 | Array.swap(NewValue); | |||
3452 | } | |||
3453 | ||||
3454 | /// Determine whether a type would actually be read by an lvalue-to-rvalue | |||
3455 | /// conversion. If it's of class type, we may assume that the copy operation | |||
3456 | /// is trivial. Note that this is never true for a union type with fields | |||
3457 | /// (because the copy always "reads" the active member) and always true for | |||
3458 | /// a non-class type. | |||
3459 | static bool isReadByLvalueToRvalueConversion(const CXXRecordDecl *RD); | |||
3460 | static bool isReadByLvalueToRvalueConversion(QualType T) { | |||
3461 | CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); | |||
3462 | return !RD || isReadByLvalueToRvalueConversion(RD); | |||
3463 | } | |||
3464 | static bool isReadByLvalueToRvalueConversion(const CXXRecordDecl *RD) { | |||
3465 | // FIXME: A trivial copy of a union copies the object representation, even if | |||
3466 | // the union is empty. | |||
3467 | if (RD->isUnion()) | |||
3468 | return !RD->field_empty(); | |||
3469 | if (RD->isEmpty()) | |||
3470 | return false; | |||
3471 | ||||
3472 | for (auto *Field : RD->fields()) | |||
3473 | if (!Field->isUnnamedBitfield() && | |||
3474 | isReadByLvalueToRvalueConversion(Field->getType())) | |||
3475 | return true; | |||
3476 | ||||
3477 | for (auto &BaseSpec : RD->bases()) | |||
3478 | if (isReadByLvalueToRvalueConversion(BaseSpec.getType())) | |||
3479 | return true; | |||
3480 | ||||
3481 | return false; | |||
3482 | } | |||
3483 | ||||
3484 | /// Diagnose an attempt to read from any unreadable field within the specified | |||
3485 | /// type, which might be a class type. | |||
3486 | static bool diagnoseMutableFields(EvalInfo &Info, const Expr *E, AccessKinds AK, | |||
3487 | QualType T) { | |||
3488 | CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); | |||
3489 | if (!RD) | |||
3490 | return false; | |||
3491 | ||||
3492 | if (!RD->hasMutableFields()) | |||
3493 | return false; | |||
3494 | ||||
3495 | for (auto *Field : RD->fields()) { | |||
3496 | // If we're actually going to read this field in some way, then it can't | |||
3497 | // be mutable. If we're in a union, then assigning to a mutable field | |||
3498 | // (even an empty one) can change the active member, so that's not OK. | |||
3499 | // FIXME: Add core issue number for the union case. | |||
3500 | if (Field->isMutable() && | |||
3501 | (RD->isUnion() || isReadByLvalueToRvalueConversion(Field->getType()))) { | |||
3502 | Info.FFDiag(E, diag::note_constexpr_access_mutable, 1) << AK << Field; | |||
3503 | Info.Note(Field->getLocation(), diag::note_declared_at); | |||
3504 | return true; | |||
3505 | } | |||
3506 | ||||
3507 | if (diagnoseMutableFields(Info, E, AK, Field->getType())) | |||
3508 | return true; | |||
3509 | } | |||
3510 | ||||
3511 | for (auto &BaseSpec : RD->bases()) | |||
3512 | if (diagnoseMutableFields(Info, E, AK, BaseSpec.getType())) | |||
3513 | return true; | |||
3514 | ||||
3515 | // All mutable fields were empty, and thus not actually read. | |||
3516 | return false; | |||
3517 | } | |||
3518 | ||||
3519 | static bool lifetimeStartedInEvaluation(EvalInfo &Info, | |||
3520 | APValue::LValueBase Base, | |||
3521 | bool MutableSubobject = false) { | |||
3522 | // A temporary or transient heap allocation we created. | |||
3523 | if (Base.getCallIndex() || Base.is<DynamicAllocLValue>()) | |||
3524 | return true; | |||
3525 | ||||
3526 | switch (Info.IsEvaluatingDecl) { | |||
3527 | case EvalInfo::EvaluatingDeclKind::None: | |||
3528 | return false; | |||
3529 | ||||
3530 | case EvalInfo::EvaluatingDeclKind::Ctor: | |||
3531 | // The variable whose initializer we're evaluating. | |||
3532 | if (Info.EvaluatingDecl == Base) | |||
3533 | return true; | |||
3534 | ||||
3535 | // A temporary lifetime-extended by the variable whose initializer we're | |||
3536 | // evaluating. | |||
3537 | if (auto *BaseE = Base.dyn_cast<const Expr *>()) | |||
3538 | if (auto *BaseMTE = dyn_cast<MaterializeTemporaryExpr>(BaseE)) | |||
3539 | return Info.EvaluatingDecl == BaseMTE->getExtendingDecl(); | |||
3540 | return false; | |||
3541 | ||||
3542 | case EvalInfo::EvaluatingDeclKind::Dtor: | |||
3543 | // C++2a [expr.const]p6: | |||
3544 | // [during constant destruction] the lifetime of a and its non-mutable | |||
3545 | // subobjects (but not its mutable subobjects) [are] considered to start | |||
3546 | // within e. | |||
3547 | if (MutableSubobject || Base != Info.EvaluatingDecl) | |||
3548 | return false; | |||
3549 | // FIXME: We can meaningfully extend this to cover non-const objects, but | |||
3550 | // we will need special handling: we should be able to access only | |||
3551 | // subobjects of such objects that are themselves declared const. | |||
3552 | QualType T = getType(Base); | |||
3553 | return T.isConstQualified() || T->isReferenceType(); | |||
3554 | } | |||
3555 | ||||
3556 | llvm_unreachable("unknown evaluating decl kind")::llvm::llvm_unreachable_internal("unknown evaluating decl kind" , "clang/lib/AST/ExprConstant.cpp", 3556); | |||
3557 | } | |||
3558 | ||||
3559 | namespace { | |||
3560 | /// A handle to a complete object (an object that is not a subobject of | |||
3561 | /// another object). | |||
3562 | struct CompleteObject { | |||
3563 | /// The identity of the object. | |||
3564 | APValue::LValueBase Base; | |||
3565 | /// The value of the complete object. | |||
3566 | APValue *Value; | |||
3567 | /// The type of the complete object. | |||
3568 | QualType Type; | |||
3569 | ||||
3570 | CompleteObject() : Value(nullptr) {} | |||
3571 | CompleteObject(APValue::LValueBase Base, APValue *Value, QualType Type) | |||
3572 | : Base(Base), Value(Value), Type(Type) {} | |||
3573 | ||||
3574 | bool mayAccessMutableMembers(EvalInfo &Info, AccessKinds AK) const { | |||
3575 | // If this isn't a "real" access (eg, if it's just accessing the type | |||
3576 | // info), allow it. We assume the type doesn't change dynamically for | |||
3577 | // subobjects of constexpr objects (even though we'd hit UB here if it | |||
3578 | // did). FIXME: Is this right? | |||
3579 | if (!isAnyAccess(AK)) | |||
3580 | return true; | |||
3581 | ||||
3582 | // In C++14 onwards, it is permitted to read a mutable member whose | |||
3583 | // lifetime began within the evaluation. | |||
3584 | // FIXME: Should we also allow this in C++11? | |||
3585 | if (!Info.getLangOpts().CPlusPlus14) | |||
3586 | return false; | |||
3587 | return lifetimeStartedInEvaluation(Info, Base, /*MutableSubobject*/true); | |||
3588 | } | |||
3589 | ||||
3590 | explicit operator bool() const { return !Type.isNull(); } | |||
3591 | }; | |||
3592 | } // end anonymous namespace | |||
3593 | ||||
3594 | static QualType getSubobjectType(QualType ObjType, QualType SubobjType, | |||
3595 | bool IsMutable = false) { | |||
3596 | // C++ [basic.type.qualifier]p1: | |||
3597 | // - A const object is an object of type const T or a non-mutable subobject | |||
3598 | // of a const object. | |||
3599 | if (ObjType.isConstQualified() && !IsMutable) | |||
3600 | SubobjType.addConst(); | |||
3601 | // - A volatile object is an object of type const T or a subobject of a | |||
3602 | // volatile object. | |||
3603 | if (ObjType.isVolatileQualified()) | |||
3604 | SubobjType.addVolatile(); | |||
3605 | return SubobjType; | |||
3606 | } | |||
3607 | ||||
3608 | /// Find the designated sub-object of an rvalue. | |||
3609 | template<typename SubobjectHandler> | |||
3610 | typename SubobjectHandler::result_type | |||
3611 | findSubobject(EvalInfo &Info, const Expr *E, const CompleteObject &Obj, | |||
3612 | const SubobjectDesignator &Sub, SubobjectHandler &handler) { | |||
3613 | if (Sub.Invalid) | |||
3614 | // A diagnostic will have already been produced. | |||
3615 | return handler.failed(); | |||
3616 | if (Sub.isOnePastTheEnd() || Sub.isMostDerivedAnUnsizedArray()) { | |||
3617 | if (Info.getLangOpts().CPlusPlus11) | |||
3618 | Info.FFDiag(E, Sub.isOnePastTheEnd() | |||
3619 | ? diag::note_constexpr_access_past_end | |||
3620 | : diag::note_constexpr_access_unsized_array) | |||
3621 | << handler.AccessKind; | |||
3622 | else | |||
3623 | Info.FFDiag(E); | |||
3624 | return handler.failed(); | |||
3625 | } | |||
3626 | ||||
3627 | APValue *O = Obj.Value; | |||
3628 | QualType ObjType = Obj.Type; | |||
3629 | const FieldDecl *LastField = nullptr; | |||
3630 | const FieldDecl *VolatileField = nullptr; | |||
3631 | ||||
3632 | // Walk the designator's path to find the subobject. | |||
3633 | for (unsigned I = 0, N = Sub.Entries.size(); /**/; ++I) { | |||
3634 | // Reading an indeterminate value is undefined, but assigning over one is OK. | |||
3635 | if ((O->isAbsent() && !(handler.AccessKind == AK_Construct && I == N)) || | |||
3636 | (O->isIndeterminate() && | |||
3637 | !isValidIndeterminateAccess(handler.AccessKind))) { | |||
3638 | if (!Info.checkingPotentialConstantExpression()) | |||
3639 | Info.FFDiag(E, diag::note_constexpr_access_uninit) | |||
3640 | << handler.AccessKind << O->isIndeterminate(); | |||
3641 | return handler.failed(); | |||
3642 | } | |||
3643 | ||||
3644 | // C++ [class.ctor]p5, C++ [class.dtor]p5: | |||
3645 | // const and volatile semantics are not applied on an object under | |||
3646 | // {con,de}struction. | |||
3647 | if ((ObjType.isConstQualified() || ObjType.isVolatileQualified()) && | |||
3648 | ObjType->isRecordType() && | |||
3649 | Info.isEvaluatingCtorDtor( | |||
3650 | Obj.Base, llvm::makeArrayRef(Sub.Entries.begin(), | |||
3651 | Sub.Entries.begin() + I)) != | |||
3652 | ConstructionPhase::None) { | |||
3653 | ObjType = Info.Ctx.getCanonicalType(ObjType); | |||
3654 | ObjType.removeLocalConst(); | |||
3655 | ObjType.removeLocalVolatile(); | |||
3656 | } | |||
3657 | ||||
3658 | // If this is our last pass, check that the final object type is OK. | |||
3659 | if (I == N || (I == N - 1 && ObjType->isAnyComplexType())) { | |||
3660 | // Accesses to volatile objects are prohibited. | |||
3661 | if (ObjType.isVolatileQualified() && isFormalAccess(handler.AccessKind)) { | |||
3662 | if (Info.getLangOpts().CPlusPlus) { | |||
3663 | int DiagKind; | |||
3664 | SourceLocation Loc; | |||
3665 | const NamedDecl *Decl = nullptr; | |||
3666 | if (VolatileField) { | |||
3667 | DiagKind = 2; | |||
3668 | Loc = VolatileField->getLocation(); | |||
3669 | Decl = VolatileField; | |||
3670 | } else if (auto *VD = Obj.Base.dyn_cast<const ValueDecl*>()) { | |||
3671 | DiagKind = 1; | |||
3672 | Loc = VD->getLocation(); | |||
3673 | Decl = VD; | |||
3674 | } else { | |||
3675 | DiagKind = 0; | |||
3676 | if (auto *E = Obj.Base.dyn_cast<const Expr *>()) | |||
3677 | Loc = E->getExprLoc(); | |||
3678 | } | |||
3679 | Info.FFDiag(E, diag::note_constexpr_access_volatile_obj, 1) | |||
3680 | << handler.AccessKind << DiagKind << Decl; | |||
3681 | Info.Note(Loc, diag::note_constexpr_volatile_here) << DiagKind; | |||
3682 | } else { | |||
3683 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
3684 | } | |||
3685 | return handler.failed(); | |||
3686 | } | |||
3687 | ||||
3688 | // If we are reading an object of class type, there may still be more | |||
3689 | // things we need to check: if there are any mutable subobjects, we | |||
3690 | // cannot perform this read. (This only happens when performing a trivial | |||
3691 | // copy or assignment.) | |||
3692 | if (ObjType->isRecordType() && | |||
3693 | !Obj.mayAccessMutableMembers(Info, handler.AccessKind) && | |||
3694 | diagnoseMutableFields(Info, E, handler.AccessKind, ObjType)) | |||
3695 | return handler.failed(); | |||
3696 | } | |||
3697 | ||||
3698 | if (I == N) { | |||
3699 | if (!handler.found(*O, ObjType)) | |||
3700 | return false; | |||
3701 | ||||
3702 | // If we modified a bit-field, truncate it to the right width. | |||
3703 | if (isModification(handler.AccessKind) && | |||
3704 | LastField && LastField->isBitField() && | |||
3705 | !truncateBitfieldValue(Info, E, *O, LastField)) | |||
3706 | return false; | |||
3707 | ||||
3708 | return true; | |||
3709 | } | |||
3710 | ||||
3711 | LastField = nullptr; | |||
3712 | if (ObjType->isArrayType()) { | |||
3713 | // Next subobject is an array element. | |||
3714 | const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(ObjType); | |||
3715 | assert(CAT && "vla in literal type?")(static_cast <bool> (CAT && "vla in literal type?" ) ? void (0) : __assert_fail ("CAT && \"vla in literal type?\"" , "clang/lib/AST/ExprConstant.cpp", 3715, __extension__ __PRETTY_FUNCTION__ )); | |||
3716 | uint64_t Index = Sub.Entries[I].getAsArrayIndex(); | |||
3717 | if (CAT->getSize().ule(Index)) { | |||
3718 | // Note, it should not be possible to form a pointer with a valid | |||
3719 | // designator which points more than one past the end of the array. | |||
3720 | if (Info.getLangOpts().CPlusPlus11) | |||
3721 | Info.FFDiag(E, diag::note_constexpr_access_past_end) | |||
3722 | << handler.AccessKind; | |||
3723 | else | |||
3724 | Info.FFDiag(E); | |||
3725 | return handler.failed(); | |||
3726 | } | |||
3727 | ||||
3728 | ObjType = CAT->getElementType(); | |||
3729 | ||||
3730 | if (O->getArrayInitializedElts() > Index) | |||
3731 | O = &O->getArrayInitializedElt(Index); | |||
3732 | else if (!isRead(handler.AccessKind)) { | |||
3733 | expandArray(*O, Index); | |||
3734 | O = &O->getArrayInitializedElt(Index); | |||
3735 | } else | |||
3736 | O = &O->getArrayFiller(); | |||
3737 | } else if (ObjType->isAnyComplexType()) { | |||
3738 | // Next subobject is a complex number. | |||
3739 | uint64_t Index = Sub.Entries[I].getAsArrayIndex(); | |||
3740 | if (Index > 1) { | |||
3741 | if (Info.getLangOpts().CPlusPlus11) | |||
3742 | Info.FFDiag(E, diag::note_constexpr_access_past_end) | |||
3743 | << handler.AccessKind; | |||
3744 | else | |||
3745 | Info.FFDiag(E); | |||
3746 | return handler.failed(); | |||
3747 | } | |||
3748 | ||||
3749 | ObjType = getSubobjectType( | |||
3750 | ObjType, ObjType->castAs<ComplexType>()->getElementType()); | |||
3751 | ||||
3752 | assert(I == N - 1 && "extracting subobject of scalar?")(static_cast <bool> (I == N - 1 && "extracting subobject of scalar?" ) ? void (0) : __assert_fail ("I == N - 1 && \"extracting subobject of scalar?\"" , "clang/lib/AST/ExprConstant.cpp", 3752, __extension__ __PRETTY_FUNCTION__ )); | |||
3753 | if (O->isComplexInt()) { | |||
3754 | return handler.found(Index ? O->getComplexIntImag() | |||
3755 | : O->getComplexIntReal(), ObjType); | |||
3756 | } else { | |||
3757 | assert(O->isComplexFloat())(static_cast <bool> (O->isComplexFloat()) ? void (0) : __assert_fail ("O->isComplexFloat()", "clang/lib/AST/ExprConstant.cpp" , 3757, __extension__ __PRETTY_FUNCTION__)); | |||
3758 | return handler.found(Index ? O->getComplexFloatImag() | |||
3759 | : O->getComplexFloatReal(), ObjType); | |||
3760 | } | |||
3761 | } else if (const FieldDecl *Field = getAsField(Sub.Entries[I])) { | |||
3762 | if (Field->isMutable() && | |||
3763 | !Obj.mayAccessMutableMembers(Info, handler.AccessKind)) { | |||
3764 | Info.FFDiag(E, diag::note_constexpr_access_mutable, 1) | |||
3765 | << handler.AccessKind << Field; | |||
3766 | Info.Note(Field->getLocation(), diag::note_declared_at); | |||
3767 | return handler.failed(); | |||
3768 | } | |||
3769 | ||||
3770 | // Next subobject is a class, struct or union field. | |||
3771 | RecordDecl *RD = ObjType->castAs<RecordType>()->getDecl(); | |||
3772 | if (RD->isUnion()) { | |||
3773 | const FieldDecl *UnionField = O->getUnionField(); | |||
3774 | if (!UnionField || | |||
3775 | UnionField->getCanonicalDecl() != Field->getCanonicalDecl()) { | |||
3776 | if (I == N - 1 && handler.AccessKind == AK_Construct) { | |||
3777 | // Placement new onto an inactive union member makes it active. | |||
3778 | O->setUnion(Field, APValue()); | |||
3779 | } else { | |||
3780 | // FIXME: If O->getUnionValue() is absent, report that there's no | |||
3781 | // active union member rather than reporting the prior active union | |||
3782 | // member. We'll need to fix nullptr_t to not use APValue() as its | |||
3783 | // representation first. | |||
3784 | Info.FFDiag(E, diag::note_constexpr_access_inactive_union_member) | |||
3785 | << handler.AccessKind << Field << !UnionField << UnionField; | |||
3786 | return handler.failed(); | |||
3787 | } | |||
3788 | } | |||
3789 | O = &O->getUnionValue(); | |||
3790 | } else | |||
3791 | O = &O->getStructField(Field->getFieldIndex()); | |||
3792 | ||||
3793 | ObjType = getSubobjectType(ObjType, Field->getType(), Field->isMutable()); | |||
3794 | LastField = Field; | |||
3795 | if (Field->getType().isVolatileQualified()) | |||
3796 | VolatileField = Field; | |||
3797 | } else { | |||
3798 | // Next subobject is a base class. | |||
3799 | const CXXRecordDecl *Derived = ObjType->getAsCXXRecordDecl(); | |||
3800 | const CXXRecordDecl *Base = getAsBaseClass(Sub.Entries[I]); | |||
3801 | O = &O->getStructBase(getBaseIndex(Derived, Base)); | |||
3802 | ||||
3803 | ObjType = getSubobjectType(ObjType, Info.Ctx.getRecordType(Base)); | |||
3804 | } | |||
3805 | } | |||
3806 | } | |||
3807 | ||||
3808 | namespace { | |||
3809 | struct ExtractSubobjectHandler { | |||
3810 | EvalInfo &Info; | |||
3811 | const Expr *E; | |||
3812 | APValue &Result; | |||
3813 | const AccessKinds AccessKind; | |||
3814 | ||||
3815 | typedef bool result_type; | |||
3816 | bool failed() { return false; } | |||
3817 | bool found(APValue &Subobj, QualType SubobjType) { | |||
3818 | Result = Subobj; | |||
3819 | if (AccessKind == AK_ReadObjectRepresentation) | |||
3820 | return true; | |||
3821 | return CheckFullyInitialized(Info, E->getExprLoc(), SubobjType, Result); | |||
3822 | } | |||
3823 | bool found(APSInt &Value, QualType SubobjType) { | |||
3824 | Result = APValue(Value); | |||
3825 | return true; | |||
3826 | } | |||
3827 | bool found(APFloat &Value, QualType SubobjType) { | |||
3828 | Result = APValue(Value); | |||
3829 | return true; | |||
3830 | } | |||
3831 | }; | |||
3832 | } // end anonymous namespace | |||
3833 | ||||
3834 | /// Extract the designated sub-object of an rvalue. | |||
3835 | static bool extractSubobject(EvalInfo &Info, const Expr *E, | |||
3836 | const CompleteObject &Obj, | |||
3837 | const SubobjectDesignator &Sub, APValue &Result, | |||
3838 | AccessKinds AK = AK_Read) { | |||
3839 | assert(AK == AK_Read || AK == AK_ReadObjectRepresentation)(static_cast <bool> (AK == AK_Read || AK == AK_ReadObjectRepresentation ) ? void (0) : __assert_fail ("AK == AK_Read || AK == AK_ReadObjectRepresentation" , "clang/lib/AST/ExprConstant.cpp", 3839, __extension__ __PRETTY_FUNCTION__ )); | |||
3840 | ExtractSubobjectHandler Handler = {Info, E, Result, AK}; | |||
3841 | return findSubobject(Info, E, Obj, Sub, Handler); | |||
3842 | } | |||
3843 | ||||
3844 | namespace { | |||
3845 | struct ModifySubobjectHandler { | |||
3846 | EvalInfo &Info; | |||
3847 | APValue &NewVal; | |||
3848 | const Expr *E; | |||
3849 | ||||
3850 | typedef bool result_type; | |||
3851 | static const AccessKinds AccessKind = AK_Assign; | |||
3852 | ||||
3853 | bool checkConst(QualType QT) { | |||
3854 | // Assigning to a const object has undefined behavior. | |||
3855 | if (QT.isConstQualified()) { | |||
3856 | Info.FFDiag(E, diag::note_constexpr_modify_const_type) << QT; | |||
3857 | return false; | |||
3858 | } | |||
3859 | return true; | |||
3860 | } | |||
3861 | ||||
3862 | bool failed() { return false; } | |||
3863 | bool found(APValue &Subobj, QualType SubobjType) { | |||
3864 | if (!checkConst(SubobjType)) | |||
3865 | return false; | |||
3866 | // We've been given ownership of NewVal, so just swap it in. | |||
3867 | Subobj.swap(NewVal); | |||
3868 | return true; | |||
3869 | } | |||
3870 | bool found(APSInt &Value, QualType SubobjType) { | |||
3871 | if (!checkConst(SubobjType)) | |||
3872 | return false; | |||
3873 | if (!NewVal.isInt()) { | |||
3874 | // Maybe trying to write a cast pointer value into a complex? | |||
3875 | Info.FFDiag(E); | |||
3876 | return false; | |||
3877 | } | |||
3878 | Value = NewVal.getInt(); | |||
3879 | return true; | |||
3880 | } | |||
3881 | bool found(APFloat &Value, QualType SubobjType) { | |||
3882 | if (!checkConst(SubobjType)) | |||
3883 | return false; | |||
3884 | Value = NewVal.getFloat(); | |||
3885 | return true; | |||
3886 | } | |||
3887 | }; | |||
3888 | } // end anonymous namespace | |||
3889 | ||||
3890 | const AccessKinds ModifySubobjectHandler::AccessKind; | |||
3891 | ||||
3892 | /// Update the designated sub-object of an rvalue to the given value. | |||
3893 | static bool modifySubobject(EvalInfo &Info, const Expr *E, | |||
3894 | const CompleteObject &Obj, | |||
3895 | const SubobjectDesignator &Sub, | |||
3896 | APValue &NewVal) { | |||
3897 | ModifySubobjectHandler Handler = { Info, NewVal, E }; | |||
3898 | return findSubobject(Info, E, Obj, Sub, Handler); | |||
3899 | } | |||
3900 | ||||
3901 | /// Find the position where two subobject designators diverge, or equivalently | |||
3902 | /// the length of the common initial subsequence. | |||
3903 | static unsigned FindDesignatorMismatch(QualType ObjType, | |||
3904 | const SubobjectDesignator &A, | |||
3905 | const SubobjectDesignator &B, | |||
3906 | bool &WasArrayIndex) { | |||
3907 | unsigned I = 0, N = std::min(A.Entries.size(), B.Entries.size()); | |||
3908 | for (/**/; I != N; ++I) { | |||
3909 | if (!ObjType.isNull() && | |||
3910 | (ObjType->isArrayType() || ObjType->isAnyComplexType())) { | |||
3911 | // Next subobject is an array element. | |||
3912 | if (A.Entries[I].getAsArrayIndex() != B.Entries[I].getAsArrayIndex()) { | |||
3913 | WasArrayIndex = true; | |||
3914 | return I; | |||
3915 | } | |||
3916 | if (ObjType->isAnyComplexType()) | |||
3917 | ObjType = ObjType->castAs<ComplexType>()->getElementType(); | |||
3918 | else | |||
3919 | ObjType = ObjType->castAsArrayTypeUnsafe()->getElementType(); | |||
3920 | } else { | |||
3921 | if (A.Entries[I].getAsBaseOrMember() != | |||
3922 | B.Entries[I].getAsBaseOrMember()) { | |||
3923 | WasArrayIndex = false; | |||
3924 | return I; | |||
3925 | } | |||
3926 | if (const FieldDecl *FD = getAsField(A.Entries[I])) | |||
3927 | // Next subobject is a field. | |||
3928 | ObjType = FD->getType(); | |||
3929 | else | |||
3930 | // Next subobject is a base class. | |||
3931 | ObjType = QualType(); | |||
3932 | } | |||
3933 | } | |||
3934 | WasArrayIndex = false; | |||
3935 | return I; | |||
3936 | } | |||
3937 | ||||
3938 | /// Determine whether the given subobject designators refer to elements of the | |||
3939 | /// same array object. | |||
3940 | static bool AreElementsOfSameArray(QualType ObjType, | |||
3941 | const SubobjectDesignator &A, | |||
3942 | const SubobjectDesignator &B) { | |||
3943 | if (A.Entries.size() != B.Entries.size()) | |||
3944 | return false; | |||
3945 | ||||
3946 | bool IsArray = A.MostDerivedIsArrayElement; | |||
3947 | if (IsArray && A.MostDerivedPathLength != A.Entries.size()) | |||
3948 | // A is a subobject of the array element. | |||
3949 | return false; | |||
3950 | ||||
3951 | // If A (and B) designates an array element, the last entry will be the array | |||
3952 | // index. That doesn't have to match. Otherwise, we're in the 'implicit array | |||
3953 | // of length 1' case, and the entire path must match. | |||
3954 | bool WasArrayIndex; | |||
3955 | unsigned CommonLength = FindDesignatorMismatch(ObjType, A, B, WasArrayIndex); | |||
3956 | return CommonLength >= A.Entries.size() - IsArray; | |||
3957 | } | |||
3958 | ||||
3959 | /// Find the complete object to which an LValue refers. | |||
3960 | static CompleteObject findCompleteObject(EvalInfo &Info, const Expr *E, | |||
3961 | AccessKinds AK, const LValue &LVal, | |||
3962 | QualType LValType) { | |||
3963 | if (LVal.InvalidBase) { | |||
3964 | Info.FFDiag(E); | |||
3965 | return CompleteObject(); | |||
3966 | } | |||
3967 | ||||
3968 | if (!LVal.Base) { | |||
3969 | Info.FFDiag(E, diag::note_constexpr_access_null) << AK; | |||
3970 | return CompleteObject(); | |||
3971 | } | |||
3972 | ||||
3973 | CallStackFrame *Frame = nullptr; | |||
3974 | unsigned Depth = 0; | |||
3975 | if (LVal.getLValueCallIndex()) { | |||
3976 | std::tie(Frame, Depth) = | |||
3977 | Info.getCallFrameAndDepth(LVal.getLValueCallIndex()); | |||
3978 | if (!Frame) { | |||
3979 | Info.FFDiag(E, diag::note_constexpr_lifetime_ended, 1) | |||
3980 | << AK << LVal.Base.is<const ValueDecl*>(); | |||
3981 | NoteLValueLocation(Info, LVal.Base); | |||
3982 | return CompleteObject(); | |||
3983 | } | |||
3984 | } | |||
3985 | ||||
3986 | bool IsAccess = isAnyAccess(AK); | |||
3987 | ||||
3988 | // C++11 DR1311: An lvalue-to-rvalue conversion on a volatile-qualified type | |||
3989 | // is not a constant expression (even if the object is non-volatile). We also | |||
3990 | // apply this rule to C++98, in order to conform to the expected 'volatile' | |||
3991 | // semantics. | |||
3992 | if (isFormalAccess(AK) && LValType.isVolatileQualified()) { | |||
3993 | if (Info.getLangOpts().CPlusPlus) | |||
3994 | Info.FFDiag(E, diag::note_constexpr_access_volatile_type) | |||
3995 | << AK << LValType; | |||
3996 | else | |||
3997 | Info.FFDiag(E); | |||
3998 | return CompleteObject(); | |||
3999 | } | |||
4000 | ||||
4001 | // Compute value storage location and type of base object. | |||
4002 | APValue *BaseVal = nullptr; | |||
4003 | QualType BaseType = getType(LVal.Base); | |||
4004 | ||||
4005 | if (Info.getLangOpts().CPlusPlus14 && LVal.Base == Info.EvaluatingDecl && | |||
4006 | lifetimeStartedInEvaluation(Info, LVal.Base)) { | |||
4007 | // This is the object whose initializer we're evaluating, so its lifetime | |||
4008 | // started in the current evaluation. | |||
4009 | BaseVal = Info.EvaluatingDeclValue; | |||
4010 | } else if (const ValueDecl *D = LVal.Base.dyn_cast<const ValueDecl *>()) { | |||
4011 | // Allow reading from a GUID declaration. | |||
4012 | if (auto *GD = dyn_cast<MSGuidDecl>(D)) { | |||
4013 | if (isModification(AK)) { | |||
4014 | // All the remaining cases do not permit modification of the object. | |||
4015 | Info.FFDiag(E, diag::note_constexpr_modify_global); | |||
4016 | return CompleteObject(); | |||
4017 | } | |||
4018 | APValue &V = GD->getAsAPValue(); | |||
4019 | if (V.isAbsent()) { | |||
4020 | Info.FFDiag(E, diag::note_constexpr_unsupported_layout) | |||
4021 | << GD->getType(); | |||
4022 | return CompleteObject(); | |||
4023 | } | |||
4024 | return CompleteObject(LVal.Base, &V, GD->getType()); | |||
4025 | } | |||
4026 | ||||
4027 | // Allow reading from template parameter objects. | |||
4028 | if (auto *TPO = dyn_cast<TemplateParamObjectDecl>(D)) { | |||
4029 | if (isModification(AK)) { | |||
4030 | Info.FFDiag(E, diag::note_constexpr_modify_global); | |||
4031 | return CompleteObject(); | |||
4032 | } | |||
4033 | return CompleteObject(LVal.Base, const_cast<APValue *>(&TPO->getValue()), | |||
4034 | TPO->getType()); | |||
4035 | } | |||
4036 | ||||
4037 | // In C++98, const, non-volatile integers initialized with ICEs are ICEs. | |||
4038 | // In C++11, constexpr, non-volatile variables initialized with constant | |||
4039 | // expressions are constant expressions too. Inside constexpr functions, | |||
4040 | // parameters are constant expressions even if they're non-const. | |||
4041 | // In C++1y, objects local to a constant expression (those with a Frame) are | |||
4042 | // both readable and writable inside constant expressions. | |||
4043 | // In C, such things can also be folded, although they are not ICEs. | |||
4044 | const VarDecl *VD = dyn_cast<VarDecl>(D); | |||
4045 | if (VD) { | |||
4046 | if (const VarDecl *VDef = VD->getDefinition(Info.Ctx)) | |||
4047 | VD = VDef; | |||
4048 | } | |||
4049 | if (!VD || VD->isInvalidDecl()) { | |||
4050 | Info.FFDiag(E); | |||
4051 | return CompleteObject(); | |||
4052 | } | |||
4053 | ||||
4054 | bool IsConstant = BaseType.isConstant(Info.Ctx); | |||
4055 | ||||
4056 | // Unless we're looking at a local variable or argument in a constexpr call, | |||
4057 | // the variable we're reading must be const. | |||
4058 | if (!Frame) { | |||
4059 | if (IsAccess && isa<ParmVarDecl>(VD)) { | |||
4060 | // Access of a parameter that's not associated with a frame isn't going | |||
4061 | // to work out, but we can leave it to evaluateVarDeclInit to provide a | |||
4062 | // suitable diagnostic. | |||
4063 | } else if (Info.getLangOpts().CPlusPlus14 && | |||
4064 | lifetimeStartedInEvaluation(Info, LVal.Base)) { | |||
4065 | // OK, we can read and modify an object if we're in the process of | |||
4066 | // evaluating its initializer, because its lifetime began in this | |||
4067 | // evaluation. | |||
4068 | } else if (isModification(AK)) { | |||
4069 | // All the remaining cases do not permit modification of the object. | |||
4070 | Info.FFDiag(E, diag::note_constexpr_modify_global); | |||
4071 | return CompleteObject(); | |||
4072 | } else if (VD->isConstexpr()) { | |||
4073 | // OK, we can read this variable. | |||
4074 | } else if (BaseType->isIntegralOrEnumerationType()) { | |||
4075 | if (!IsConstant) { | |||
4076 | if (!IsAccess) | |||
4077 | return CompleteObject(LVal.getLValueBase(), nullptr, BaseType); | |||
4078 | if (Info.getLangOpts().CPlusPlus) { | |||
4079 | Info.FFDiag(E, diag::note_constexpr_ltor_non_const_int, 1) << VD; | |||
4080 | Info.Note(VD->getLocation(), diag::note_declared_at); | |||
4081 | } else { | |||
4082 | Info.FFDiag(E); | |||
4083 | } | |||
4084 | return CompleteObject(); | |||
4085 | } | |||
4086 | } else if (!IsAccess) { | |||
4087 | return CompleteObject(LVal.getLValueBase(), nullptr, BaseType); | |||
4088 | } else if (IsConstant && Info.checkingPotentialConstantExpression() && | |||
4089 | BaseType->isLiteralType(Info.Ctx) && !VD->hasDefinition()) { | |||
4090 | // This variable might end up being constexpr. Don't diagnose it yet. | |||
4091 | } else if (IsConstant) { | |||
4092 | // Keep evaluating to see what we can do. In particular, we support | |||
4093 | // folding of const floating-point types, in order to make static const | |||
4094 | // data members of such types (supported as an extension) more useful. | |||
4095 | if (Info.getLangOpts().CPlusPlus) { | |||
4096 | Info.CCEDiag(E, Info.getLangOpts().CPlusPlus11 | |||
4097 | ? diag::note_constexpr_ltor_non_constexpr | |||
4098 | : diag::note_constexpr_ltor_non_integral, 1) | |||
4099 | << VD << BaseType; | |||
4100 | Info.Note(VD->getLocation(), diag::note_declared_at); | |||
4101 | } else { | |||
4102 | Info.CCEDiag(E); | |||
4103 | } | |||
4104 | } else { | |||
4105 | // Never allow reading a non-const value. | |||
4106 | if (Info.getLangOpts().CPlusPlus) { | |||
4107 | Info.FFDiag(E, Info.getLangOpts().CPlusPlus11 | |||
4108 | ? diag::note_constexpr_ltor_non_constexpr | |||
4109 | : diag::note_constexpr_ltor_non_integral, 1) | |||
4110 | << VD << BaseType; | |||
4111 | Info.Note(VD->getLocation(), diag::note_declared_at); | |||
4112 | } else { | |||
4113 | Info.FFDiag(E); | |||
4114 | } | |||
4115 | return CompleteObject(); | |||
4116 | } | |||
4117 | } | |||
4118 | ||||
4119 | if (!evaluateVarDeclInit(Info, E, VD, Frame, LVal.getLValueVersion(), BaseVal)) | |||
4120 | return CompleteObject(); | |||
4121 | } else if (DynamicAllocLValue DA = LVal.Base.dyn_cast<DynamicAllocLValue>()) { | |||
4122 | Optional<DynAlloc*> Alloc = Info.lookupDynamicAlloc(DA); | |||
4123 | if (!Alloc) { | |||
4124 | Info.FFDiag(E, diag::note_constexpr_access_deleted_object) << AK; | |||
4125 | return CompleteObject(); | |||
4126 | } | |||
4127 | return CompleteObject(LVal.Base, &(*Alloc)->Value, | |||
4128 | LVal.Base.getDynamicAllocType()); | |||
4129 | } else { | |||
4130 | const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); | |||
4131 | ||||
4132 | if (!Frame) { | |||
4133 | if (const MaterializeTemporaryExpr *MTE = | |||
4134 | dyn_cast_or_null<MaterializeTemporaryExpr>(Base)) { | |||
4135 | assert(MTE->getStorageDuration() == SD_Static &&(static_cast <bool> (MTE->getStorageDuration() == SD_Static && "should have a frame for a non-global materialized temporary" ) ? void (0) : __assert_fail ("MTE->getStorageDuration() == SD_Static && \"should have a frame for a non-global materialized temporary\"" , "clang/lib/AST/ExprConstant.cpp", 4136, __extension__ __PRETTY_FUNCTION__ )) | |||
4136 | "should have a frame for a non-global materialized temporary")(static_cast <bool> (MTE->getStorageDuration() == SD_Static && "should have a frame for a non-global materialized temporary" ) ? void (0) : __assert_fail ("MTE->getStorageDuration() == SD_Static && \"should have a frame for a non-global materialized temporary\"" , "clang/lib/AST/ExprConstant.cpp", 4136, __extension__ __PRETTY_FUNCTION__ )); | |||
4137 | ||||
4138 | // C++20 [expr.const]p4: [DR2126] | |||
4139 | // An object or reference is usable in constant expressions if it is | |||
4140 | // - a temporary object of non-volatile const-qualified literal type | |||
4141 | // whose lifetime is extended to that of a variable that is usable | |||
4142 | // in constant expressions | |||
4143 | // | |||
4144 | // C++20 [expr.const]p5: | |||
4145 | // an lvalue-to-rvalue conversion [is not allowed unless it applies to] | |||
4146 | // - a non-volatile glvalue that refers to an object that is usable | |||
4147 | // in constant expressions, or | |||
4148 | // - a non-volatile glvalue of literal type that refers to a | |||
4149 | // non-volatile object whose lifetime began within the evaluation | |||
4150 | // of E; | |||
4151 | // | |||
4152 | // C++11 misses the 'began within the evaluation of e' check and | |||
4153 | // instead allows all temporaries, including things like: | |||
4154 | // int &&r = 1; | |||
4155 | // int x = ++r; | |||
4156 | // constexpr int k = r; | |||
4157 | // Therefore we use the C++14-onwards rules in C++11 too. | |||
4158 | // | |||
4159 | // Note that temporaries whose lifetimes began while evaluating a | |||
4160 | // variable's constructor are not usable while evaluating the | |||
4161 | // corresponding destructor, not even if they're of const-qualified | |||
4162 | // types. | |||
4163 | if (!MTE->isUsableInConstantExpressions(Info.Ctx) && | |||
4164 | !lifetimeStartedInEvaluation(Info, LVal.Base)) { | |||
4165 | if (!IsAccess) | |||
4166 | return CompleteObject(LVal.getLValueBase(), nullptr, BaseType); | |||
4167 | Info.FFDiag(E, diag::note_constexpr_access_static_temporary, 1) << AK; | |||
4168 | Info.Note(MTE->getExprLoc(), diag::note_constexpr_temporary_here); | |||
4169 | return CompleteObject(); | |||
4170 | } | |||
4171 | ||||
4172 | BaseVal = MTE->getOrCreateValue(false); | |||
4173 | assert(BaseVal && "got reference to unevaluated temporary")(static_cast <bool> (BaseVal && "got reference to unevaluated temporary" ) ? void (0) : __assert_fail ("BaseVal && \"got reference to unevaluated temporary\"" , "clang/lib/AST/ExprConstant.cpp", 4173, __extension__ __PRETTY_FUNCTION__ )); | |||
4174 | } else { | |||
4175 | if (!IsAccess) | |||
4176 | return CompleteObject(LVal.getLValueBase(), nullptr, BaseType); | |||
4177 | APValue Val; | |||
4178 | LVal.moveInto(Val); | |||
4179 | Info.FFDiag(E, diag::note_constexpr_access_unreadable_object) | |||
4180 | << AK | |||
4181 | << Val.getAsString(Info.Ctx, | |||
4182 | Info.Ctx.getLValueReferenceType(LValType)); | |||
4183 | NoteLValueLocation(Info, LVal.Base); | |||
4184 | return CompleteObject(); | |||
4185 | } | |||
4186 | } else { | |||
4187 | BaseVal = Frame->getTemporary(Base, LVal.Base.getVersion()); | |||
4188 | assert(BaseVal && "missing value for temporary")(static_cast <bool> (BaseVal && "missing value for temporary" ) ? void (0) : __assert_fail ("BaseVal && \"missing value for temporary\"" , "clang/lib/AST/ExprConstant.cpp", 4188, __extension__ __PRETTY_FUNCTION__ )); | |||
4189 | } | |||
4190 | } | |||
4191 | ||||
4192 | // In C++14, we can't safely access any mutable state when we might be | |||
4193 | // evaluating after an unmodeled side effect. Parameters are modeled as state | |||
4194 | // in the caller, but aren't visible once the call returns, so they can be | |||
4195 | // modified in a speculatively-evaluated call. | |||
4196 | // | |||
4197 | // FIXME: Not all local state is mutable. Allow local constant subobjects | |||
4198 | // to be read here (but take care with 'mutable' fields). | |||
4199 | unsigned VisibleDepth = Depth; | |||
4200 | if (llvm::isa_and_nonnull<ParmVarDecl>( | |||
4201 | LVal.Base.dyn_cast<const ValueDecl *>())) | |||
4202 | ++VisibleDepth; | |||
4203 | if ((Frame && Info.getLangOpts().CPlusPlus14 && | |||
4204 | Info.EvalStatus.HasSideEffects) || | |||
4205 | (isModification(AK) && VisibleDepth < Info.SpeculativeEvaluationDepth)) | |||
4206 | return CompleteObject(); | |||
4207 | ||||
4208 | return CompleteObject(LVal.getLValueBase(), BaseVal, BaseType); | |||
4209 | } | |||
4210 | ||||
4211 | /// Perform an lvalue-to-rvalue conversion on the given glvalue. This | |||
4212 | /// can also be used for 'lvalue-to-lvalue' conversions for looking up the | |||
4213 | /// glvalue referred to by an entity of reference type. | |||
4214 | /// | |||
4215 | /// \param Info - Information about the ongoing evaluation. | |||
4216 | /// \param Conv - The expression for which we are performing the conversion. | |||
4217 | /// Used for diagnostics. | |||
4218 | /// \param Type - The type of the glvalue (before stripping cv-qualifiers in the | |||
4219 | /// case of a non-class type). | |||
4220 | /// \param LVal - The glvalue on which we are attempting to perform this action. | |||
4221 | /// \param RVal - The produced value will be placed here. | |||
4222 | /// \param WantObjectRepresentation - If true, we're looking for the object | |||
4223 | /// representation rather than the value, and in particular, | |||
4224 | /// there is no requirement that the result be fully initialized. | |||
4225 | static bool | |||
4226 | handleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, QualType Type, | |||
4227 | const LValue &LVal, APValue &RVal, | |||
4228 | bool WantObjectRepresentation = false) { | |||
4229 | if (LVal.Designator.Invalid) | |||
4230 | return false; | |||
4231 | ||||
4232 | // Check for special cases where there is no existing APValue to look at. | |||
4233 | const Expr *Base = LVal.Base.dyn_cast<const Expr*>(); | |||
4234 | ||||
4235 | AccessKinds AK = | |||
4236 | WantObjectRepresentation ? AK_ReadObjectRepresentation : AK_Read; | |||
4237 | ||||
4238 | if (Base && !LVal.getLValueCallIndex() && !Type.isVolatileQualified()) { | |||
4239 | if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(Base)) { | |||
4240 | // In C99, a CompoundLiteralExpr is an lvalue, and we defer evaluating the | |||
4241 | // initializer until now for such expressions. Such an expression can't be | |||
4242 | // an ICE in C, so this only matters for fold. | |||
4243 | if (Type.isVolatileQualified()) { | |||
4244 | Info.FFDiag(Conv); | |||
4245 | return false; | |||
4246 | } | |||
4247 | APValue Lit; | |||
4248 | if (!Evaluate(Lit, Info, CLE->getInitializer())) | |||
4249 | return false; | |||
4250 | CompleteObject LitObj(LVal.Base, &Lit, Base->getType()); | |||
4251 | return extractSubobject(Info, Conv, LitObj, LVal.Designator, RVal, AK); | |||
4252 | } else if (isa<StringLiteral>(Base) || isa<PredefinedExpr>(Base)) { | |||
4253 | // Special-case character extraction so we don't have to construct an | |||
4254 | // APValue for the whole string. | |||
4255 | assert(LVal.Designator.Entries.size() <= 1 &&(static_cast <bool> (LVal.Designator.Entries.size() <= 1 && "Can only read characters from string literals" ) ? void (0) : __assert_fail ("LVal.Designator.Entries.size() <= 1 && \"Can only read characters from string literals\"" , "clang/lib/AST/ExprConstant.cpp", 4256, __extension__ __PRETTY_FUNCTION__ )) | |||
4256 | "Can only read characters from string literals")(static_cast <bool> (LVal.Designator.Entries.size() <= 1 && "Can only read characters from string literals" ) ? void (0) : __assert_fail ("LVal.Designator.Entries.size() <= 1 && \"Can only read characters from string literals\"" , "clang/lib/AST/ExprConstant.cpp", 4256, __extension__ __PRETTY_FUNCTION__ )); | |||
4257 | if (LVal.Designator.Entries.empty()) { | |||
4258 | // Fail for now for LValue to RValue conversion of an array. | |||
4259 | // (This shouldn't show up in C/C++, but it could be triggered by a | |||
4260 | // weird EvaluateAsRValue call from a tool.) | |||
4261 | Info.FFDiag(Conv); | |||
4262 | return false; | |||
4263 | } | |||
4264 | if (LVal.Designator.isOnePastTheEnd()) { | |||
4265 | if (Info.getLangOpts().CPlusPlus11) | |||
4266 | Info.FFDiag(Conv, diag::note_constexpr_access_past_end) << AK; | |||
4267 | else | |||
4268 | Info.FFDiag(Conv); | |||
4269 | return false; | |||
4270 | } | |||
4271 | uint64_t CharIndex = LVal.Designator.Entries[0].getAsArrayIndex(); | |||
4272 | RVal = APValue(extractStringLiteralCharacter(Info, Base, CharIndex)); | |||
4273 | return true; | |||
4274 | } | |||
4275 | } | |||
4276 | ||||
4277 | CompleteObject Obj = findCompleteObject(Info, Conv, AK, LVal, Type); | |||
4278 | return Obj && extractSubobject(Info, Conv, Obj, LVal.Designator, RVal, AK); | |||
4279 | } | |||
4280 | ||||
4281 | /// Perform an assignment of Val to LVal. Takes ownership of Val. | |||
4282 | static bool handleAssignment(EvalInfo &Info, const Expr *E, const LValue &LVal, | |||
4283 | QualType LValType, APValue &Val) { | |||
4284 | if (LVal.Designator.Invalid) | |||
4285 | return false; | |||
4286 | ||||
4287 | if (!Info.getLangOpts().CPlusPlus14) { | |||
4288 | Info.FFDiag(E); | |||
4289 | return false; | |||
4290 | } | |||
4291 | ||||
4292 | CompleteObject Obj = findCompleteObject(Info, E, AK_Assign, LVal, LValType); | |||
4293 | return Obj && modifySubobject(Info, E, Obj, LVal.Designator, Val); | |||
4294 | } | |||
4295 | ||||
4296 | namespace { | |||
4297 | struct CompoundAssignSubobjectHandler { | |||
4298 | EvalInfo &Info; | |||
4299 | const CompoundAssignOperator *E; | |||
4300 | QualType PromotedLHSType; | |||
4301 | BinaryOperatorKind Opcode; | |||
4302 | const APValue &RHS; | |||
4303 | ||||
4304 | static const AccessKinds AccessKind = AK_Assign; | |||
4305 | ||||
4306 | typedef bool result_type; | |||
4307 | ||||
4308 | bool checkConst(QualType QT) { | |||
4309 | // Assigning to a const object has undefined behavior. | |||
4310 | if (QT.isConstQualified()) { | |||
4311 | Info.FFDiag(E, diag::note_constexpr_modify_const_type) << QT; | |||
4312 | return false; | |||
4313 | } | |||
4314 | return true; | |||
4315 | } | |||
4316 | ||||
4317 | bool failed() { return false; } | |||
4318 | bool found(APValue &Subobj, QualType SubobjType) { | |||
4319 | switch (Subobj.getKind()) { | |||
4320 | case APValue::Int: | |||
4321 | return found(Subobj.getInt(), SubobjType); | |||
4322 | case APValue::Float: | |||
4323 | return found(Subobj.getFloat(), SubobjType); | |||
4324 | case APValue::ComplexInt: | |||
4325 | case APValue::ComplexFloat: | |||
4326 | // FIXME: Implement complex compound assignment. | |||
4327 | Info.FFDiag(E); | |||
4328 | return false; | |||
4329 | case APValue::LValue: | |||
4330 | return foundPointer(Subobj, SubobjType); | |||
4331 | case APValue::Vector: | |||
4332 | return foundVector(Subobj, SubobjType); | |||
4333 | default: | |||
4334 | // FIXME: can this happen? | |||
4335 | Info.FFDiag(E); | |||
4336 | return false; | |||
4337 | } | |||
4338 | } | |||
4339 | ||||
4340 | bool foundVector(APValue &Value, QualType SubobjType) { | |||
4341 | if (!checkConst(SubobjType)) | |||
4342 | return false; | |||
4343 | ||||
4344 | if (!SubobjType->isVectorType()) { | |||
4345 | Info.FFDiag(E); | |||
4346 | return false; | |||
4347 | } | |||
4348 | return handleVectorVectorBinOp(Info, E, Opcode, Value, RHS); | |||
4349 | } | |||
4350 | ||||
4351 | bool found(APSInt &Value, QualType SubobjType) { | |||
4352 | if (!checkConst(SubobjType)) | |||
4353 | return false; | |||
4354 | ||||
4355 | if (!SubobjType->isIntegerType()) { | |||
4356 | // We don't support compound assignment on integer-cast-to-pointer | |||
4357 | // values. | |||
4358 | Info.FFDiag(E); | |||
4359 | return false; | |||
4360 | } | |||
4361 | ||||
4362 | if (RHS.isInt()) { | |||
4363 | APSInt LHS = | |||
4364 | HandleIntToIntCast(Info, E, PromotedLHSType, SubobjType, Value); | |||
4365 | if (!handleIntIntBinOp(Info, E, LHS, Opcode, RHS.getInt(), LHS)) | |||
4366 | return false; | |||
4367 | Value = HandleIntToIntCast(Info, E, SubobjType, PromotedLHSType, LHS); | |||
4368 | return true; | |||
4369 | } else if (RHS.isFloat()) { | |||
4370 | const FPOptions FPO = E->getFPFeaturesInEffect( | |||
4371 | Info.Ctx.getLangOpts()); | |||
4372 | APFloat FValue(0.0); | |||
4373 | return HandleIntToFloatCast(Info, E, FPO, SubobjType, Value, | |||
4374 | PromotedLHSType, FValue) && | |||
4375 | handleFloatFloatBinOp(Info, E, FValue, Opcode, RHS.getFloat()) && | |||
4376 | HandleFloatToIntCast(Info, E, PromotedLHSType, FValue, SubobjType, | |||
4377 | Value); | |||
4378 | } | |||
4379 | ||||
4380 | Info.FFDiag(E); | |||
4381 | return false; | |||
4382 | } | |||
4383 | bool found(APFloat &Value, QualType SubobjType) { | |||
4384 | return checkConst(SubobjType) && | |||
4385 | HandleFloatToFloatCast(Info, E, SubobjType, PromotedLHSType, | |||
4386 | Value) && | |||
4387 | handleFloatFloatBinOp(Info, E, Value, Opcode, RHS.getFloat()) && | |||
4388 | HandleFloatToFloatCast(Info, E, PromotedLHSType, SubobjType, Value); | |||
4389 | } | |||
4390 | bool foundPointer(APValue &Subobj, QualType SubobjType) { | |||
4391 | if (!checkConst(SubobjType)) | |||
4392 | return false; | |||
4393 | ||||
4394 | QualType PointeeType; | |||
4395 | if (const PointerType *PT = SubobjType->getAs<PointerType>()) | |||
4396 | PointeeType = PT->getPointeeType(); | |||
4397 | ||||
4398 | if (PointeeType.isNull() || !RHS.isInt() || | |||
4399 | (Opcode != BO_Add && Opcode != BO_Sub)) { | |||
4400 | Info.FFDiag(E); | |||
4401 | return false; | |||
4402 | } | |||
4403 | ||||
4404 | APSInt Offset = RHS.getInt(); | |||
4405 | if (Opcode == BO_Sub) | |||
4406 | negateAsSigned(Offset); | |||
4407 | ||||
4408 | LValue LVal; | |||
4409 | LVal.setFrom(Info.Ctx, Subobj); | |||
4410 | if (!HandleLValueArrayAdjustment(Info, E, LVal, PointeeType, Offset)) | |||
4411 | return false; | |||
4412 | LVal.moveInto(Subobj); | |||
4413 | return true; | |||
4414 | } | |||
4415 | }; | |||
4416 | } // end anonymous namespace | |||
4417 | ||||
4418 | const AccessKinds CompoundAssignSubobjectHandler::AccessKind; | |||
4419 | ||||
4420 | /// Perform a compound assignment of LVal <op>= RVal. | |||
4421 | static bool handleCompoundAssignment(EvalInfo &Info, | |||
4422 | const CompoundAssignOperator *E, | |||
4423 | const LValue &LVal, QualType LValType, | |||
4424 | QualType PromotedLValType, | |||
4425 | BinaryOperatorKind Opcode, | |||
4426 | const APValue &RVal) { | |||
4427 | if (LVal.Designator.Invalid) | |||
4428 | return false; | |||
4429 | ||||
4430 | if (!Info.getLangOpts().CPlusPlus14) { | |||
4431 | Info.FFDiag(E); | |||
4432 | return false; | |||
4433 | } | |||
4434 | ||||
4435 | CompleteObject Obj = findCompleteObject(Info, E, AK_Assign, LVal, LValType); | |||
4436 | CompoundAssignSubobjectHandler Handler = { Info, E, PromotedLValType, Opcode, | |||
4437 | RVal }; | |||
4438 | return Obj && findSubobject(Info, E, Obj, LVal.Designator, Handler); | |||
4439 | } | |||
4440 | ||||
4441 | namespace { | |||
4442 | struct IncDecSubobjectHandler { | |||
4443 | EvalInfo &Info; | |||
4444 | const UnaryOperator *E; | |||
4445 | AccessKinds AccessKind; | |||
4446 | APValue *Old; | |||
4447 | ||||
4448 | typedef bool result_type; | |||
4449 | ||||
4450 | bool checkConst(QualType QT) { | |||
4451 | // Assigning to a const object has undefined behavior. | |||
4452 | if (QT.isConstQualified()) { | |||
4453 | Info.FFDiag(E, diag::note_constexpr_modify_const_type) << QT; | |||
4454 | return false; | |||
4455 | } | |||
4456 | return true; | |||
4457 | } | |||
4458 | ||||
4459 | bool failed() { return false; } | |||
4460 | bool found(APValue &Subobj, QualType SubobjType) { | |||
4461 | // Stash the old value. Also clear Old, so we don't clobber it later | |||
4462 | // if we're post-incrementing a complex. | |||
4463 | if (Old) { | |||
4464 | *Old = Subobj; | |||
4465 | Old = nullptr; | |||
4466 | } | |||
4467 | ||||
4468 | switch (Subobj.getKind()) { | |||
4469 | case APValue::Int: | |||
4470 | return found(Subobj.getInt(), SubobjType); | |||
4471 | case APValue::Float: | |||
4472 | return found(Subobj.getFloat(), SubobjType); | |||
4473 | case APValue::ComplexInt: | |||
4474 | return found(Subobj.getComplexIntReal(), | |||
4475 | SubobjType->castAs<ComplexType>()->getElementType() | |||
4476 | .withCVRQualifiers(SubobjType.getCVRQualifiers())); | |||
4477 | case APValue::ComplexFloat: | |||
4478 | return found(Subobj.getComplexFloatReal(), | |||
4479 | SubobjType->castAs<ComplexType>()->getElementType() | |||
4480 | .withCVRQualifiers(SubobjType.getCVRQualifiers())); | |||
4481 | case APValue::LValue: | |||
4482 | return foundPointer(Subobj, SubobjType); | |||
4483 | default: | |||
4484 | // FIXME: can this happen? | |||
4485 | Info.FFDiag(E); | |||
4486 | return false; | |||
4487 | } | |||
4488 | } | |||
4489 | bool found(APSInt &Value, QualType SubobjType) { | |||
4490 | if (!checkConst(SubobjType)) | |||
4491 | return false; | |||
4492 | ||||
4493 | if (!SubobjType->isIntegerType()) { | |||
4494 | // We don't support increment / decrement on integer-cast-to-pointer | |||
4495 | // values. | |||
4496 | Info.FFDiag(E); | |||
4497 | return false; | |||
4498 | } | |||
4499 | ||||
4500 | if (Old) *Old = APValue(Value); | |||
4501 | ||||
4502 | // bool arithmetic promotes to int, and the conversion back to bool | |||
4503 | // doesn't reduce mod 2^n, so special-case it. | |||
4504 | if (SubobjType->isBooleanType()) { | |||
4505 | if (AccessKind == AK_Increment) | |||
4506 | Value = 1; | |||
4507 | else | |||
4508 | Value = !Value; | |||
4509 | return true; | |||
4510 | } | |||
4511 | ||||
4512 | bool WasNegative = Value.isNegative(); | |||
4513 | if (AccessKind == AK_Increment) { | |||
4514 | ++Value; | |||
4515 | ||||
4516 | if (!WasNegative && Value.isNegative() && E->canOverflow()) { | |||
4517 | APSInt ActualValue(Value, /*IsUnsigned*/true); | |||
4518 | return HandleOverflow(Info, E, ActualValue, SubobjType); | |||
4519 | } | |||
4520 | } else { | |||
4521 | --Value; | |||
4522 | ||||
4523 | if (WasNegative && !Value.isNegative() && E->canOverflow()) { | |||
4524 | unsigned BitWidth = Value.getBitWidth(); | |||
4525 | APSInt ActualValue(Value.sext(BitWidth + 1), /*IsUnsigned*/false); | |||
4526 | ActualValue.setBit(BitWidth); | |||
4527 | return HandleOverflow(Info, E, ActualValue, SubobjType); | |||
4528 | } | |||
4529 | } | |||
4530 | return true; | |||
4531 | } | |||
4532 | bool found(APFloat &Value, QualType SubobjType) { | |||
4533 | if (!checkConst(SubobjType)) | |||
4534 | return false; | |||
4535 | ||||
4536 | if (Old) *Old = APValue(Value); | |||
4537 | ||||
4538 | APFloat One(Value.getSemantics(), 1); | |||
4539 | if (AccessKind == AK_Increment) | |||
4540 | Value.add(One, APFloat::rmNearestTiesToEven); | |||
4541 | else | |||
4542 | Value.subtract(One, APFloat::rmNearestTiesToEven); | |||
4543 | return true; | |||
4544 | } | |||
4545 | bool foundPointer(APValue &Subobj, QualType SubobjType) { | |||
4546 | if (!checkConst(SubobjType)) | |||
4547 | return false; | |||
4548 | ||||
4549 | QualType PointeeType; | |||
4550 | if (const PointerType *PT = SubobjType->getAs<PointerType>()) | |||
4551 | PointeeType = PT->getPointeeType(); | |||
4552 | else { | |||
4553 | Info.FFDiag(E); | |||
4554 | return false; | |||
4555 | } | |||
4556 | ||||
4557 | LValue LVal; | |||
4558 | LVal.setFrom(Info.Ctx, Subobj); | |||
4559 | if (!HandleLValueArrayAdjustment(Info, E, LVal, PointeeType, | |||
4560 | AccessKind == AK_Increment ? 1 : -1)) | |||
4561 | return false; | |||
4562 | LVal.moveInto(Subobj); | |||
4563 | return true; | |||
4564 | } | |||
4565 | }; | |||
4566 | } // end anonymous namespace | |||
4567 | ||||
4568 | /// Perform an increment or decrement on LVal. | |||
4569 | static bool handleIncDec(EvalInfo &Info, const Expr *E, const LValue &LVal, | |||
4570 | QualType LValType, bool IsIncrement, APValue *Old) { | |||
4571 | if (LVal.Designator.Invalid) | |||
4572 | return false; | |||
4573 | ||||
4574 | if (!Info.getLangOpts().CPlusPlus14) { | |||
4575 | Info.FFDiag(E); | |||
4576 | return false; | |||
4577 | } | |||
4578 | ||||
4579 | AccessKinds AK = IsIncrement ? AK_Increment : AK_Decrement; | |||
4580 | CompleteObject Obj = findCompleteObject(Info, E, AK, LVal, LValType); | |||
4581 | IncDecSubobjectHandler Handler = {Info, cast<UnaryOperator>(E), AK, Old}; | |||
4582 | return Obj && findSubobject(Info, E, Obj, LVal.Designator, Handler); | |||
4583 | } | |||
4584 | ||||
4585 | /// Build an lvalue for the object argument of a member function call. | |||
4586 | static bool EvaluateObjectArgument(EvalInfo &Info, const Expr *Object, | |||
4587 | LValue &This) { | |||
4588 | if (Object->getType()->isPointerType() && Object->isPRValue()) | |||
4589 | return EvaluatePointer(Object, This, Info); | |||
4590 | ||||
4591 | if (Object->isGLValue()) | |||
4592 | return EvaluateLValue(Object, This, Info); | |||
4593 | ||||
4594 | if (Object->getType()->isLiteralType(Info.Ctx)) | |||
4595 | return EvaluateTemporary(Object, This, Info); | |||
4596 | ||||
4597 | Info.FFDiag(Object, diag::note_constexpr_nonliteral) << Object->getType(); | |||
4598 | return false; | |||
4599 | } | |||
4600 | ||||
4601 | /// HandleMemberPointerAccess - Evaluate a member access operation and build an | |||
4602 | /// lvalue referring to the result. | |||
4603 | /// | |||
4604 | /// \param Info - Information about the ongoing evaluation. | |||
4605 | /// \param LV - An lvalue referring to the base of the member pointer. | |||
4606 | /// \param RHS - The member pointer expression. | |||
4607 | /// \param IncludeMember - Specifies whether the member itself is included in | |||
4608 | /// the resulting LValue subobject designator. This is not possible when | |||
4609 | /// creating a bound member function. | |||
4610 | /// \return The field or method declaration to which the member pointer refers, | |||
4611 | /// or 0 if evaluation fails. | |||
4612 | static const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, | |||
4613 | QualType LVType, | |||
4614 | LValue &LV, | |||
4615 | const Expr *RHS, | |||
4616 | bool IncludeMember = true) { | |||
4617 | MemberPtr MemPtr; | |||
4618 | if (!EvaluateMemberPointer(RHS, MemPtr, Info)) | |||
4619 | return nullptr; | |||
4620 | ||||
4621 | // C++11 [expr.mptr.oper]p6: If the second operand is the null pointer to | |||
4622 | // member value, the behavior is undefined. | |||
4623 | if (!MemPtr.getDecl()) { | |||
4624 | // FIXME: Specific diagnostic. | |||
4625 | Info.FFDiag(RHS); | |||
4626 | return nullptr; | |||
4627 | } | |||
4628 | ||||
4629 | if (MemPtr.isDerivedMember()) { | |||
4630 | // This is a member of some derived class. Truncate LV appropriately. | |||
4631 | // The end of the derived-to-base path for the base object must match the | |||
4632 | // derived-to-base path for the member pointer. | |||
4633 | if (LV.Designator.MostDerivedPathLength + MemPtr.Path.size() > | |||
4634 | LV.Designator.Entries.size()) { | |||
4635 | Info.FFDiag(RHS); | |||
4636 | return nullptr; | |||
4637 | } | |||
4638 | unsigned PathLengthToMember = | |||
4639 | LV.Designator.Entries.size() - MemPtr.Path.size(); | |||
4640 | for (unsigned I = 0, N = MemPtr.Path.size(); I != N; ++I) { | |||
4641 | const CXXRecordDecl *LVDecl = getAsBaseClass( | |||
4642 | LV.Designator.Entries[PathLengthToMember + I]); | |||
4643 | const CXXRecordDecl *MPDecl = MemPtr.Path[I]; | |||
4644 | if (LVDecl->getCanonicalDecl() != MPDecl->getCanonicalDecl()) { | |||
4645 | Info.FFDiag(RHS); | |||
4646 | return nullptr; | |||
4647 | } | |||
4648 | } | |||
4649 | ||||
4650 | // Truncate the lvalue to the appropriate derived class. | |||
4651 | if (!CastToDerivedClass(Info, RHS, LV, MemPtr.getContainingRecord(), | |||
4652 | PathLengthToMember)) | |||
4653 | return nullptr; | |||
4654 | } else if (!MemPtr.Path.empty()) { | |||
4655 | // Extend the LValue path with the member pointer's path. | |||
4656 | LV.Designator.Entries.reserve(LV.Designator.Entries.size() + | |||
4657 | MemPtr.Path.size() + IncludeMember); | |||
4658 | ||||
4659 | // Walk down to the appropriate base class. | |||
4660 | if (const PointerType *PT = LVType->getAs<PointerType>()) | |||
4661 | LVType = PT->getPointeeType(); | |||
4662 | const CXXRecordDecl *RD = LVType->getAsCXXRecordDecl(); | |||
4663 | assert(RD && "member pointer access on non-class-type expression")(static_cast <bool> (RD && "member pointer access on non-class-type expression" ) ? void (0) : __assert_fail ("RD && \"member pointer access on non-class-type expression\"" , "clang/lib/AST/ExprConstant.cpp", 4663, __extension__ __PRETTY_FUNCTION__ )); | |||
4664 | // The first class in the path is that of the lvalue. | |||
4665 | for (unsigned I = 1, N = MemPtr.Path.size(); I != N; ++I) { | |||
4666 | const CXXRecordDecl *Base = MemPtr.Path[N - I - 1]; | |||
4667 | if (!HandleLValueDirectBase(Info, RHS, LV, RD, Base)) | |||
4668 | return nullptr; | |||
4669 | RD = Base; | |||
4670 | } | |||
4671 | // Finally cast to the class containing the member. | |||
4672 | if (!HandleLValueDirectBase(Info, RHS, LV, RD, | |||
4673 | MemPtr.getContainingRecord())) | |||
4674 | return nullptr; | |||
4675 | } | |||
4676 | ||||
4677 | // Add the member. Note that we cannot build bound member functions here. | |||
4678 | if (IncludeMember) { | |||
4679 | if (const FieldDecl *FD = dyn_cast<FieldDecl>(MemPtr.getDecl())) { | |||
4680 | if (!HandleLValueMember(Info, RHS, LV, FD)) | |||
4681 | return nullptr; | |||
4682 | } else if (const IndirectFieldDecl *IFD = | |||
4683 | dyn_cast<IndirectFieldDecl>(MemPtr.getDecl())) { | |||
4684 | if (!HandleLValueIndirectMember(Info, RHS, LV, IFD)) | |||
4685 | return nullptr; | |||
4686 | } else { | |||
4687 | llvm_unreachable("can't construct reference to bound member function")::llvm::llvm_unreachable_internal("can't construct reference to bound member function" , "clang/lib/AST/ExprConstant.cpp", 4687); | |||
4688 | } | |||
4689 | } | |||
4690 | ||||
4691 | return MemPtr.getDecl(); | |||
4692 | } | |||
4693 | ||||
4694 | static const ValueDecl *HandleMemberPointerAccess(EvalInfo &Info, | |||
4695 | const BinaryOperator *BO, | |||
4696 | LValue &LV, | |||
4697 | bool IncludeMember = true) { | |||
4698 | assert(BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI)(static_cast <bool> (BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI) ? void (0) : __assert_fail ("BO->getOpcode() == BO_PtrMemD || BO->getOpcode() == BO_PtrMemI" , "clang/lib/AST/ExprConstant.cpp", 4698, __extension__ __PRETTY_FUNCTION__ )); | |||
4699 | ||||
4700 | if (!EvaluateObjectArgument(Info, BO->getLHS(), LV)) { | |||
4701 | if (Info.noteFailure()) { | |||
4702 | MemberPtr MemPtr; | |||
4703 | EvaluateMemberPointer(BO->getRHS(), MemPtr, Info); | |||
4704 | } | |||
4705 | return nullptr; | |||
4706 | } | |||
4707 | ||||
4708 | return HandleMemberPointerAccess(Info, BO->getLHS()->getType(), LV, | |||
4709 | BO->getRHS(), IncludeMember); | |||
4710 | } | |||
4711 | ||||
4712 | /// HandleBaseToDerivedCast - Apply the given base-to-derived cast operation on | |||
4713 | /// the provided lvalue, which currently refers to the base object. | |||
4714 | static bool HandleBaseToDerivedCast(EvalInfo &Info, const CastExpr *E, | |||
4715 | LValue &Result) { | |||
4716 | SubobjectDesignator &D = Result.Designator; | |||
4717 | if (D.Invalid || !Result.checkNullPointer(Info, E, CSK_Derived)) | |||
4718 | return false; | |||
4719 | ||||
4720 | QualType TargetQT = E->getType(); | |||
4721 | if (const PointerType *PT = TargetQT->getAs<PointerType>()) | |||
4722 | TargetQT = PT->getPointeeType(); | |||
4723 | ||||
4724 | // Check this cast lands within the final derived-to-base subobject path. | |||
4725 | if (D.MostDerivedPathLength + E->path_size() > D.Entries.size()) { | |||
4726 | Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) | |||
4727 | << D.MostDerivedType << TargetQT; | |||
4728 | return false; | |||
4729 | } | |||
4730 | ||||
4731 | // Check the type of the final cast. We don't need to check the path, | |||
4732 | // since a cast can only be formed if the path is unique. | |||
4733 | unsigned NewEntriesSize = D.Entries.size() - E->path_size(); | |||
4734 | const CXXRecordDecl *TargetType = TargetQT->getAsCXXRecordDecl(); | |||
4735 | const CXXRecordDecl *FinalType; | |||
4736 | if (NewEntriesSize == D.MostDerivedPathLength) | |||
4737 | FinalType = D.MostDerivedType->getAsCXXRecordDecl(); | |||
4738 | else | |||
4739 | FinalType = getAsBaseClass(D.Entries[NewEntriesSize - 1]); | |||
4740 | if (FinalType->getCanonicalDecl() != TargetType->getCanonicalDecl()) { | |||
4741 | Info.CCEDiag(E, diag::note_constexpr_invalid_downcast) | |||
4742 | << D.MostDerivedType << TargetQT; | |||
4743 | return false; | |||
4744 | } | |||
4745 | ||||
4746 | // Truncate the lvalue to the appropriate derived class. | |||
4747 | return CastToDerivedClass(Info, E, Result, TargetType, NewEntriesSize); | |||
4748 | } | |||
4749 | ||||
4750 | /// Get the value to use for a default-initialized object of type T. | |||
4751 | /// Return false if it encounters something invalid. | |||
4752 | static bool getDefaultInitValue(QualType T, APValue &Result) { | |||
4753 | bool Success = true; | |||
4754 | if (auto *RD = T->getAsCXXRecordDecl()) { | |||
4755 | if (RD->isInvalidDecl()) { | |||
4756 | Result = APValue(); | |||
4757 | return false; | |||
4758 | } | |||
4759 | if (RD->isUnion()) { | |||
4760 | Result = APValue((const FieldDecl *)nullptr); | |||
4761 | return true; | |||
4762 | } | |||
4763 | Result = APValue(APValue::UninitStruct(), RD->getNumBases(), | |||
4764 | std::distance(RD->field_begin(), RD->field_end())); | |||
4765 | ||||
4766 | unsigned Index = 0; | |||
4767 | for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), | |||
4768 | End = RD->bases_end(); | |||
4769 | I != End; ++I, ++Index) | |||
4770 | Success &= getDefaultInitValue(I->getType(), Result.getStructBase(Index)); | |||
4771 | ||||
4772 | for (const auto *I : RD->fields()) { | |||
4773 | if (I->isUnnamedBitfield()) | |||
4774 | continue; | |||
4775 | Success &= getDefaultInitValue(I->getType(), | |||
4776 | Result.getStructField(I->getFieldIndex())); | |||
4777 | } | |||
4778 | return Success; | |||
4779 | } | |||
4780 | ||||
4781 | if (auto *AT = | |||
4782 | dyn_cast_or_null<ConstantArrayType>(T->getAsArrayTypeUnsafe())) { | |||
4783 | Result = APValue(APValue::UninitArray(), 0, AT->getSize().getZExtValue()); | |||
4784 | if (Result.hasArrayFiller()) | |||
4785 | Success &= | |||
4786 | getDefaultInitValue(AT->getElementType(), Result.getArrayFiller()); | |||
4787 | ||||
4788 | return Success; | |||
4789 | } | |||
4790 | ||||
4791 | Result = APValue::IndeterminateValue(); | |||
4792 | return true; | |||
4793 | } | |||
4794 | ||||
4795 | namespace { | |||
4796 | enum EvalStmtResult { | |||
4797 | /// Evaluation failed. | |||
4798 | ESR_Failed, | |||
4799 | /// Hit a 'return' statement. | |||
4800 | ESR_Returned, | |||
4801 | /// Evaluation succeeded. | |||
4802 | ESR_Succeeded, | |||
4803 | /// Hit a 'continue' statement. | |||
4804 | ESR_Continue, | |||
4805 | /// Hit a 'break' statement. | |||
4806 | ESR_Break, | |||
4807 | /// Still scanning for 'case' or 'default' statement. | |||
4808 | ESR_CaseNotFound | |||
4809 | }; | |||
4810 | } | |||
4811 | ||||
4812 | static bool EvaluateVarDecl(EvalInfo &Info, const VarDecl *VD) { | |||
4813 | // We don't need to evaluate the initializer for a static local. | |||
4814 | if (!VD->hasLocalStorage()) | |||
4815 | return true; | |||
4816 | ||||
4817 | LValue Result; | |||
4818 | APValue &Val = Info.CurrentCall->createTemporary(VD, VD->getType(), | |||
4819 | ScopeKind::Block, Result); | |||
4820 | ||||
4821 | const Expr *InitE = VD->getInit(); | |||
4822 | if (!InitE) { | |||
4823 | if (VD->getType()->isDependentType()) | |||
4824 | return Info.noteSideEffect(); | |||
4825 | return getDefaultInitValue(VD->getType(), Val); | |||
4826 | } | |||
4827 | if (InitE->isValueDependent()) | |||
4828 | return false; | |||
4829 | ||||
4830 | if (!EvaluateInPlace(Val, Info, Result, InitE)) { | |||
4831 | // Wipe out any partially-computed value, to allow tracking that this | |||
4832 | // evaluation failed. | |||
4833 | Val = APValue(); | |||
4834 | return false; | |||
4835 | } | |||
4836 | ||||
4837 | return true; | |||
4838 | } | |||
4839 | ||||
4840 | static bool EvaluateDecl(EvalInfo &Info, const Decl *D) { | |||
4841 | bool OK = true; | |||
4842 | ||||
4843 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) | |||
4844 | OK &= EvaluateVarDecl(Info, VD); | |||
4845 | ||||
4846 | if (const DecompositionDecl *DD = dyn_cast<DecompositionDecl>(D)) | |||
4847 | for (auto *BD : DD->bindings()) | |||
4848 | if (auto *VD = BD->getHoldingVar()) | |||
4849 | OK &= EvaluateDecl(Info, VD); | |||
4850 | ||||
4851 | return OK; | |||
4852 | } | |||
4853 | ||||
4854 | static bool EvaluateDependentExpr(const Expr *E, EvalInfo &Info) { | |||
4855 | assert(E->isValueDependent())(static_cast <bool> (E->isValueDependent()) ? void ( 0) : __assert_fail ("E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 4855, __extension__ __PRETTY_FUNCTION__)); | |||
4856 | if (Info.noteSideEffect()) | |||
4857 | return true; | |||
4858 | assert(E->containsErrors() && "valid value-dependent expression should never "(static_cast <bool> (E->containsErrors() && "valid value-dependent expression should never " "reach invalid code path.") ? void (0) : __assert_fail ("E->containsErrors() && \"valid value-dependent expression should never \" \"reach invalid code path.\"" , "clang/lib/AST/ExprConstant.cpp", 4859, __extension__ __PRETTY_FUNCTION__ )) | |||
4859 | "reach invalid code path.")(static_cast <bool> (E->containsErrors() && "valid value-dependent expression should never " "reach invalid code path.") ? void (0) : __assert_fail ("E->containsErrors() && \"valid value-dependent expression should never \" \"reach invalid code path.\"" , "clang/lib/AST/ExprConstant.cpp", 4859, __extension__ __PRETTY_FUNCTION__ )); | |||
4860 | return false; | |||
4861 | } | |||
4862 | ||||
4863 | /// Evaluate a condition (either a variable declaration or an expression). | |||
4864 | static bool EvaluateCond(EvalInfo &Info, const VarDecl *CondDecl, | |||
4865 | const Expr *Cond, bool &Result) { | |||
4866 | if (Cond->isValueDependent()) | |||
4867 | return false; | |||
4868 | FullExpressionRAII Scope(Info); | |||
4869 | if (CondDecl && !EvaluateDecl(Info, CondDecl)) | |||
4870 | return false; | |||
4871 | if (!EvaluateAsBooleanCondition(Cond, Result, Info)) | |||
4872 | return false; | |||
4873 | return Scope.destroy(); | |||
4874 | } | |||
4875 | ||||
4876 | namespace { | |||
4877 | /// A location where the result (returned value) of evaluating a | |||
4878 | /// statement should be stored. | |||
4879 | struct StmtResult { | |||
4880 | /// The APValue that should be filled in with the returned value. | |||
4881 | APValue &Value; | |||
4882 | /// The location containing the result, if any (used to support RVO). | |||
4883 | const LValue *Slot; | |||
4884 | }; | |||
4885 | ||||
4886 | struct TempVersionRAII { | |||
4887 | CallStackFrame &Frame; | |||
4888 | ||||
4889 | TempVersionRAII(CallStackFrame &Frame) : Frame(Frame) { | |||
4890 | Frame.pushTempVersion(); | |||
4891 | } | |||
4892 | ||||
4893 | ~TempVersionRAII() { | |||
4894 | Frame.popTempVersion(); | |||
4895 | } | |||
4896 | }; | |||
4897 | ||||
4898 | } | |||
4899 | ||||
4900 | static EvalStmtResult EvaluateStmt(StmtResult &Result, EvalInfo &Info, | |||
4901 | const Stmt *S, | |||
4902 | const SwitchCase *SC = nullptr); | |||
4903 | ||||
4904 | /// Evaluate the body of a loop, and translate the result as appropriate. | |||
4905 | static EvalStmtResult EvaluateLoopBody(StmtResult &Result, EvalInfo &Info, | |||
4906 | const Stmt *Body, | |||
4907 | const SwitchCase *Case = nullptr) { | |||
4908 | BlockScopeRAII Scope(Info); | |||
4909 | ||||
4910 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Body, Case); | |||
4911 | if (ESR != ESR_Failed && ESR != ESR_CaseNotFound && !Scope.destroy()) | |||
4912 | ESR = ESR_Failed; | |||
4913 | ||||
4914 | switch (ESR) { | |||
4915 | case ESR_Break: | |||
4916 | return ESR_Succeeded; | |||
4917 | case ESR_Succeeded: | |||
4918 | case ESR_Continue: | |||
4919 | return ESR_Continue; | |||
4920 | case ESR_Failed: | |||
4921 | case ESR_Returned: | |||
4922 | case ESR_CaseNotFound: | |||
4923 | return ESR; | |||
4924 | } | |||
4925 | llvm_unreachable("Invalid EvalStmtResult!")::llvm::llvm_unreachable_internal("Invalid EvalStmtResult!", "clang/lib/AST/ExprConstant.cpp" , 4925); | |||
4926 | } | |||
4927 | ||||
4928 | /// Evaluate a switch statement. | |||
4929 | static EvalStmtResult EvaluateSwitch(StmtResult &Result, EvalInfo &Info, | |||
4930 | const SwitchStmt *SS) { | |||
4931 | BlockScopeRAII Scope(Info); | |||
4932 | ||||
4933 | // Evaluate the switch condition. | |||
4934 | APSInt Value; | |||
4935 | { | |||
4936 | if (const Stmt *Init = SS->getInit()) { | |||
4937 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Init); | |||
4938 | if (ESR != ESR_Succeeded) { | |||
4939 | if (ESR != ESR_Failed && !Scope.destroy()) | |||
4940 | ESR = ESR_Failed; | |||
4941 | return ESR; | |||
4942 | } | |||
4943 | } | |||
4944 | ||||
4945 | FullExpressionRAII CondScope(Info); | |||
4946 | if (SS->getConditionVariable() && | |||
4947 | !EvaluateDecl(Info, SS->getConditionVariable())) | |||
4948 | return ESR_Failed; | |||
4949 | if (SS->getCond()->isValueDependent()) { | |||
4950 | if (!EvaluateDependentExpr(SS->getCond(), Info)) | |||
4951 | return ESR_Failed; | |||
4952 | } else { | |||
4953 | if (!EvaluateInteger(SS->getCond(), Value, Info)) | |||
4954 | return ESR_Failed; | |||
4955 | } | |||
4956 | if (!CondScope.destroy()) | |||
4957 | return ESR_Failed; | |||
4958 | } | |||
4959 | ||||
4960 | // Find the switch case corresponding to the value of the condition. | |||
4961 | // FIXME: Cache this lookup. | |||
4962 | const SwitchCase *Found = nullptr; | |||
4963 | for (const SwitchCase *SC = SS->getSwitchCaseList(); SC; | |||
4964 | SC = SC->getNextSwitchCase()) { | |||
4965 | if (isa<DefaultStmt>(SC)) { | |||
4966 | Found = SC; | |||
4967 | continue; | |||
4968 | } | |||
4969 | ||||
4970 | const CaseStmt *CS = cast<CaseStmt>(SC); | |||
4971 | APSInt LHS = CS->getLHS()->EvaluateKnownConstInt(Info.Ctx); | |||
4972 | APSInt RHS = CS->getRHS() ? CS->getRHS()->EvaluateKnownConstInt(Info.Ctx) | |||
4973 | : LHS; | |||
4974 | if (LHS <= Value && Value <= RHS) { | |||
4975 | Found = SC; | |||
4976 | break; | |||
4977 | } | |||
4978 | } | |||
4979 | ||||
4980 | if (!Found) | |||
4981 | return Scope.destroy() ? ESR_Succeeded : ESR_Failed; | |||
4982 | ||||
4983 | // Search the switch body for the switch case and evaluate it from there. | |||
4984 | EvalStmtResult ESR = EvaluateStmt(Result, Info, SS->getBody(), Found); | |||
4985 | if (ESR != ESR_Failed && ESR != ESR_CaseNotFound && !Scope.destroy()) | |||
4986 | return ESR_Failed; | |||
4987 | ||||
4988 | switch (ESR) { | |||
4989 | case ESR_Break: | |||
4990 | return ESR_Succeeded; | |||
4991 | case ESR_Succeeded: | |||
4992 | case ESR_Continue: | |||
4993 | case ESR_Failed: | |||
4994 | case ESR_Returned: | |||
4995 | return ESR; | |||
4996 | case ESR_CaseNotFound: | |||
4997 | // This can only happen if the switch case is nested within a statement | |||
4998 | // expression. We have no intention of supporting that. | |||
4999 | Info.FFDiag(Found->getBeginLoc(), | |||
5000 | diag::note_constexpr_stmt_expr_unsupported); | |||
5001 | return ESR_Failed; | |||
5002 | } | |||
5003 | llvm_unreachable("Invalid EvalStmtResult!")::llvm::llvm_unreachable_internal("Invalid EvalStmtResult!", "clang/lib/AST/ExprConstant.cpp" , 5003); | |||
5004 | } | |||
5005 | ||||
5006 | // Evaluate a statement. | |||
5007 | static EvalStmtResult EvaluateStmt(StmtResult &Result, EvalInfo &Info, | |||
5008 | const Stmt *S, const SwitchCase *Case) { | |||
5009 | if (!Info.nextStep(S)) | |||
5010 | return ESR_Failed; | |||
5011 | ||||
5012 | // If we're hunting down a 'case' or 'default' label, recurse through | |||
5013 | // substatements until we hit the label. | |||
5014 | if (Case) { | |||
5015 | switch (S->getStmtClass()) { | |||
5016 | case Stmt::CompoundStmtClass: | |||
5017 | // FIXME: Precompute which substatement of a compound statement we | |||
5018 | // would jump to, and go straight there rather than performing a | |||
5019 | // linear scan each time. | |||
5020 | case Stmt::LabelStmtClass: | |||
5021 | case Stmt::AttributedStmtClass: | |||
5022 | case Stmt::DoStmtClass: | |||
5023 | break; | |||
5024 | ||||
5025 | case Stmt::CaseStmtClass: | |||
5026 | case Stmt::DefaultStmtClass: | |||
5027 | if (Case == S) | |||
5028 | Case = nullptr; | |||
5029 | break; | |||
5030 | ||||
5031 | case Stmt::IfStmtClass: { | |||
5032 | // FIXME: Precompute which side of an 'if' we would jump to, and go | |||
5033 | // straight there rather than scanning both sides. | |||
5034 | const IfStmt *IS = cast<IfStmt>(S); | |||
5035 | ||||
5036 | // Wrap the evaluation in a block scope, in case it's a DeclStmt | |||
5037 | // preceded by our switch label. | |||
5038 | BlockScopeRAII Scope(Info); | |||
5039 | ||||
5040 | // Step into the init statement in case it brings an (uninitialized) | |||
5041 | // variable into scope. | |||
5042 | if (const Stmt *Init = IS->getInit()) { | |||
5043 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Init, Case); | |||
5044 | if (ESR != ESR_CaseNotFound) { | |||
5045 | assert(ESR != ESR_Succeeded)(static_cast <bool> (ESR != ESR_Succeeded) ? void (0) : __assert_fail ("ESR != ESR_Succeeded", "clang/lib/AST/ExprConstant.cpp" , 5045, __extension__ __PRETTY_FUNCTION__)); | |||
5046 | return ESR; | |||
5047 | } | |||
5048 | } | |||
5049 | ||||
5050 | // Condition variable must be initialized if it exists. | |||
5051 | // FIXME: We can skip evaluating the body if there's a condition | |||
5052 | // variable, as there can't be any case labels within it. | |||
5053 | // (The same is true for 'for' statements.) | |||
5054 | ||||
5055 | EvalStmtResult ESR = EvaluateStmt(Result, Info, IS->getThen(), Case); | |||
5056 | if (ESR == ESR_Failed) | |||
5057 | return ESR; | |||
5058 | if (ESR != ESR_CaseNotFound) | |||
5059 | return Scope.destroy() ? ESR : ESR_Failed; | |||
5060 | if (!IS->getElse()) | |||
5061 | return ESR_CaseNotFound; | |||
5062 | ||||
5063 | ESR = EvaluateStmt(Result, Info, IS->getElse(), Case); | |||
5064 | if (ESR == ESR_Failed) | |||
5065 | return ESR; | |||
5066 | if (ESR != ESR_CaseNotFound) | |||
5067 | return Scope.destroy() ? ESR : ESR_Failed; | |||
5068 | return ESR_CaseNotFound; | |||
5069 | } | |||
5070 | ||||
5071 | case Stmt::WhileStmtClass: { | |||
5072 | EvalStmtResult ESR = | |||
5073 | EvaluateLoopBody(Result, Info, cast<WhileStmt>(S)->getBody(), Case); | |||
5074 | if (ESR != ESR_Continue) | |||
5075 | return ESR; | |||
5076 | break; | |||
5077 | } | |||
5078 | ||||
5079 | case Stmt::ForStmtClass: { | |||
5080 | const ForStmt *FS = cast<ForStmt>(S); | |||
5081 | BlockScopeRAII Scope(Info); | |||
5082 | ||||
5083 | // Step into the init statement in case it brings an (uninitialized) | |||
5084 | // variable into scope. | |||
5085 | if (const Stmt *Init = FS->getInit()) { | |||
5086 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Init, Case); | |||
5087 | if (ESR != ESR_CaseNotFound) { | |||
5088 | assert(ESR != ESR_Succeeded)(static_cast <bool> (ESR != ESR_Succeeded) ? void (0) : __assert_fail ("ESR != ESR_Succeeded", "clang/lib/AST/ExprConstant.cpp" , 5088, __extension__ __PRETTY_FUNCTION__)); | |||
5089 | return ESR; | |||
5090 | } | |||
5091 | } | |||
5092 | ||||
5093 | EvalStmtResult ESR = | |||
5094 | EvaluateLoopBody(Result, Info, FS->getBody(), Case); | |||
5095 | if (ESR != ESR_Continue) | |||
5096 | return ESR; | |||
5097 | if (const auto *Inc = FS->getInc()) { | |||
5098 | if (Inc->isValueDependent()) { | |||
5099 | if (!EvaluateDependentExpr(Inc, Info)) | |||
5100 | return ESR_Failed; | |||
5101 | } else { | |||
5102 | FullExpressionRAII IncScope(Info); | |||
5103 | if (!EvaluateIgnoredValue(Info, Inc) || !IncScope.destroy()) | |||
5104 | return ESR_Failed; | |||
5105 | } | |||
5106 | } | |||
5107 | break; | |||
5108 | } | |||
5109 | ||||
5110 | case Stmt::DeclStmtClass: { | |||
5111 | // Start the lifetime of any uninitialized variables we encounter. They | |||
5112 | // might be used by the selected branch of the switch. | |||
5113 | const DeclStmt *DS = cast<DeclStmt>(S); | |||
5114 | for (const auto *D : DS->decls()) { | |||
5115 | if (const auto *VD = dyn_cast<VarDecl>(D)) { | |||
5116 | if (VD->hasLocalStorage() && !VD->getInit()) | |||
5117 | if (!EvaluateVarDecl(Info, VD)) | |||
5118 | return ESR_Failed; | |||
5119 | // FIXME: If the variable has initialization that can't be jumped | |||
5120 | // over, bail out of any immediately-surrounding compound-statement | |||
5121 | // too. There can't be any case labels here. | |||
5122 | } | |||
5123 | } | |||
5124 | return ESR_CaseNotFound; | |||
5125 | } | |||
5126 | ||||
5127 | default: | |||
5128 | return ESR_CaseNotFound; | |||
5129 | } | |||
5130 | } | |||
5131 | ||||
5132 | switch (S->getStmtClass()) { | |||
5133 | default: | |||
5134 | if (const Expr *E = dyn_cast<Expr>(S)) { | |||
5135 | if (E->isValueDependent()) { | |||
5136 | if (!EvaluateDependentExpr(E, Info)) | |||
5137 | return ESR_Failed; | |||
5138 | } else { | |||
5139 | // Don't bother evaluating beyond an expression-statement which couldn't | |||
5140 | // be evaluated. | |||
5141 | // FIXME: Do we need the FullExpressionRAII object here? | |||
5142 | // VisitExprWithCleanups should create one when necessary. | |||
5143 | FullExpressionRAII Scope(Info); | |||
5144 | if (!EvaluateIgnoredValue(Info, E) || !Scope.destroy()) | |||
5145 | return ESR_Failed; | |||
5146 | } | |||
5147 | return ESR_Succeeded; | |||
5148 | } | |||
5149 | ||||
5150 | Info.FFDiag(S->getBeginLoc()); | |||
5151 | return ESR_Failed; | |||
5152 | ||||
5153 | case Stmt::NullStmtClass: | |||
5154 | return ESR_Succeeded; | |||
5155 | ||||
5156 | case Stmt::DeclStmtClass: { | |||
5157 | const DeclStmt *DS = cast<DeclStmt>(S); | |||
5158 | for (const auto *D : DS->decls()) { | |||
5159 | // Each declaration initialization is its own full-expression. | |||
5160 | FullExpressionRAII Scope(Info); | |||
5161 | if (!EvaluateDecl(Info, D) && !Info.noteFailure()) | |||
5162 | return ESR_Failed; | |||
5163 | if (!Scope.destroy()) | |||
5164 | return ESR_Failed; | |||
5165 | } | |||
5166 | return ESR_Succeeded; | |||
5167 | } | |||
5168 | ||||
5169 | case Stmt::ReturnStmtClass: { | |||
5170 | const Expr *RetExpr = cast<ReturnStmt>(S)->getRetValue(); | |||
5171 | FullExpressionRAII Scope(Info); | |||
5172 | if (RetExpr && RetExpr->isValueDependent()) { | |||
5173 | EvaluateDependentExpr(RetExpr, Info); | |||
5174 | // We know we returned, but we don't know what the value is. | |||
5175 | return ESR_Failed; | |||
5176 | } | |||
5177 | if (RetExpr && | |||
5178 | !(Result.Slot | |||
5179 | ? EvaluateInPlace(Result.Value, Info, *Result.Slot, RetExpr) | |||
5180 | : Evaluate(Result.Value, Info, RetExpr))) | |||
5181 | return ESR_Failed; | |||
5182 | return Scope.destroy() ? ESR_Returned : ESR_Failed; | |||
5183 | } | |||
5184 | ||||
5185 | case Stmt::CompoundStmtClass: { | |||
5186 | BlockScopeRAII Scope(Info); | |||
5187 | ||||
5188 | const CompoundStmt *CS = cast<CompoundStmt>(S); | |||
5189 | for (const auto *BI : CS->body()) { | |||
5190 | EvalStmtResult ESR = EvaluateStmt(Result, Info, BI, Case); | |||
5191 | if (ESR == ESR_Succeeded) | |||
5192 | Case = nullptr; | |||
5193 | else if (ESR != ESR_CaseNotFound) { | |||
5194 | if (ESR != ESR_Failed && !Scope.destroy()) | |||
5195 | return ESR_Failed; | |||
5196 | return ESR; | |||
5197 | } | |||
5198 | } | |||
5199 | if (Case) | |||
5200 | return ESR_CaseNotFound; | |||
5201 | return Scope.destroy() ? ESR_Succeeded : ESR_Failed; | |||
5202 | } | |||
5203 | ||||
5204 | case Stmt::IfStmtClass: { | |||
5205 | const IfStmt *IS = cast<IfStmt>(S); | |||
5206 | ||||
5207 | // Evaluate the condition, as either a var decl or as an expression. | |||
5208 | BlockScopeRAII Scope(Info); | |||
5209 | if (const Stmt *Init = IS->getInit()) { | |||
5210 | EvalStmtResult ESR = EvaluateStmt(Result, Info, Init); | |||
5211 | if (ESR != ESR_Succeeded) { | |||
5212 | if (ESR != ESR_Failed && !Scope.destroy()) | |||
5213 | return ESR_Failed; | |||
5214 | return ESR; | |||
5215 | } | |||
5216 | } | |||
5217 | bool Cond; | |||
5218 | if (IS->isConsteval()) | |||
5219 | Cond = IS->isNonNegatedConsteval(); | |||
5220 | else if (!EvaluateCond(Info, IS->getConditionVariable(), IS->getCond(), | |||
5221 | Cond)) | |||
5222 | return ESR_Failed; | |||
5223 | ||||
5224 | if (const Stmt *SubStmt = Cond ? IS->getThen() : IS->getElse()) { | |||
5225 | EvalStmtResult ESR = EvaluateStmt(Result, Info, SubStmt); | |||
5226 | if (ESR != ESR_Succeeded) { | |||
5227 | if (ESR != ESR_Failed && !Scope.destroy()) | |||
5228 | return ESR_Failed; | |||
5229 | return ESR; | |||
5230 | } | |||
5231 | } | |||
5232 | return Scope.destroy() ? ESR_Succeeded : ESR_Failed; | |||
5233 | } | |||
5234 | ||||
5235 | case Stmt::WhileStmtClass: { | |||
5236 | const WhileStmt *WS = cast<WhileStmt>(S); | |||
5237 | while (true) { | |||
5238 | BlockScopeRAII Scope(Info); | |||
5239 | bool Continue; | |||
5240 | if (!EvaluateCond(Info, WS->getConditionVariable(), WS->getCond(), | |||
5241 | Continue)) | |||
5242 | return ESR_Failed; | |||
5243 | if (!Continue) | |||
5244 | break; | |||
5245 | ||||
5246 | EvalStmtResult ESR = EvaluateLoopBody(Result, Info, WS->getBody()); | |||
5247 | if (ESR != ESR_Continue) { | |||
5248 | if (ESR != ESR_Failed && !Scope.destroy()) | |||
5249 | return ESR_Failed; | |||
5250 | return ESR; | |||
5251 | } | |||
5252 | if (!Scope.destroy()) | |||
5253 | return ESR_Failed; | |||
5254 | } | |||
5255 | return ESR_Succeeded; | |||
5256 | } | |||
5257 | ||||
5258 | case Stmt::DoStmtClass: { | |||
5259 | const DoStmt *DS = cast<DoStmt>(S); | |||
5260 | bool Continue; | |||
5261 | do { | |||
5262 | EvalStmtResult ESR = EvaluateLoopBody(Result, Info, DS->getBody(), Case); | |||
5263 | if (ESR != ESR_Continue) | |||
5264 | return ESR; | |||
5265 | Case = nullptr; | |||
5266 | ||||
5267 | if (DS->getCond()->isValueDependent()) { | |||
5268 | EvaluateDependentExpr(DS->getCond(), Info); | |||
5269 | // Bailout as we don't know whether to keep going or terminate the loop. | |||
5270 | return ESR_Failed; | |||
5271 | } | |||
5272 | FullExpressionRAII CondScope(Info); | |||
5273 | if (!EvaluateAsBooleanCondition(DS->getCond(), Continue, Info) || | |||
5274 | !CondScope.destroy()) | |||
5275 | return ESR_Failed; | |||
5276 | } while (Continue); | |||
5277 | return ESR_Succeeded; | |||
5278 | } | |||
5279 | ||||
5280 | case Stmt::ForStmtClass: { | |||
5281 | const ForStmt *FS = cast<ForStmt>(S); | |||
5282 | BlockScopeRAII ForScope(Info); | |||
5283 | if (FS->getInit()) { | |||
5284 | EvalStmtResult ESR = EvaluateStmt(Result, Info, FS->getInit()); | |||
5285 | if (ESR != ESR_Succeeded) { | |||
5286 | if (ESR != ESR_Failed && !ForScope.destroy()) | |||
5287 | return ESR_Failed; | |||
5288 | return ESR; | |||
5289 | } | |||
5290 | } | |||
5291 | while (true) { | |||
5292 | BlockScopeRAII IterScope(Info); | |||
5293 | bool Continue = true; | |||
5294 | if (FS->getCond() && !EvaluateCond(Info, FS->getConditionVariable(), | |||
5295 | FS->getCond(), Continue)) | |||
5296 | return ESR_Failed; | |||
5297 | if (!Continue) | |||
5298 | break; | |||
5299 | ||||
5300 | EvalStmtResult ESR = EvaluateLoopBody(Result, Info, FS->getBody()); | |||
5301 | if (ESR != ESR_Continue) { | |||
5302 | if (ESR != ESR_Failed && (!IterScope.destroy() || !ForScope.destroy())) | |||
5303 | return ESR_Failed; | |||
5304 | return ESR; | |||
5305 | } | |||
5306 | ||||
5307 | if (const auto *Inc = FS->getInc()) { | |||
5308 | if (Inc->isValueDependent()) { | |||
5309 | if (!EvaluateDependentExpr(Inc, Info)) | |||
5310 | return ESR_Failed; | |||
5311 | } else { | |||
5312 | FullExpressionRAII IncScope(Info); | |||
5313 | if (!EvaluateIgnoredValue(Info, Inc) || !IncScope.destroy()) | |||
5314 | return ESR_Failed; | |||
5315 | } | |||
5316 | } | |||
5317 | ||||
5318 | if (!IterScope.destroy()) | |||
5319 | return ESR_Failed; | |||
5320 | } | |||
5321 | return ForScope.destroy() ? ESR_Succeeded : ESR_Failed; | |||
5322 | } | |||
5323 | ||||
5324 | case Stmt::CXXForRangeStmtClass: { | |||
5325 | const CXXForRangeStmt *FS = cast<CXXForRangeStmt>(S); | |||
5326 | BlockScopeRAII Scope(Info); | |||
5327 | ||||
5328 | // Evaluate the init-statement if present. | |||
5329 | if (FS->getInit()) { | |||
5330 | EvalStmtResult ESR = EvaluateStmt(Result, Info, FS->getInit()); | |||
5331 | if (ESR != ESR_Succeeded) { | |||
5332 | if (ESR != ESR_Failed && !Scope.destroy()) | |||
5333 | return ESR_Failed; | |||
5334 | return ESR; | |||
5335 | } | |||
5336 | } | |||
5337 | ||||
5338 | // Initialize the __range variable. | |||
5339 | EvalStmtResult ESR = EvaluateStmt(Result, Info, FS->getRangeStmt()); | |||
5340 | if (ESR != ESR_Succeeded) { | |||
5341 | if (ESR != ESR_Failed && !Scope.destroy()) | |||
5342 | return ESR_Failed; | |||
5343 | return ESR; | |||
5344 | } | |||
5345 | ||||
5346 | // In error-recovery cases it's possible to get here even if we failed to | |||
5347 | // synthesize the __begin and __end variables. | |||
5348 | if (!FS->getBeginStmt() || !FS->getEndStmt() || !FS->getCond()) | |||
5349 | return ESR_Failed; | |||
5350 | ||||
5351 | // Create the __begin and __end iterators. | |||
5352 | ESR = EvaluateStmt(Result, Info, FS->getBeginStmt()); | |||
5353 | if (ESR != ESR_Succeeded) { | |||
5354 | if (ESR != ESR_Failed && !Scope.destroy()) | |||
5355 | return ESR_Failed; | |||
5356 | return ESR; | |||
5357 | } | |||
5358 | ESR = EvaluateStmt(Result, Info, FS->getEndStmt()); | |||
5359 | if (ESR != ESR_Succeeded) { | |||
5360 | if (ESR != ESR_Failed && !Scope.destroy()) | |||
5361 | return ESR_Failed; | |||
5362 | return ESR; | |||
5363 | } | |||
5364 | ||||
5365 | while (true) { | |||
5366 | // Condition: __begin != __end. | |||
5367 | { | |||
5368 | if (FS->getCond()->isValueDependent()) { | |||
5369 | EvaluateDependentExpr(FS->getCond(), Info); | |||
5370 | // We don't know whether to keep going or terminate the loop. | |||
5371 | return ESR_Failed; | |||
5372 | } | |||
5373 | bool Continue = true; | |||
5374 | FullExpressionRAII CondExpr(Info); | |||
5375 | if (!EvaluateAsBooleanCondition(FS->getCond(), Continue, Info)) | |||
5376 | return ESR_Failed; | |||
5377 | if (!Continue) | |||
5378 | break; | |||
5379 | } | |||
5380 | ||||
5381 | // User's variable declaration, initialized by *__begin. | |||
5382 | BlockScopeRAII InnerScope(Info); | |||
5383 | ESR = EvaluateStmt(Result, Info, FS->getLoopVarStmt()); | |||
5384 | if (ESR != ESR_Succeeded) { | |||
5385 | if (ESR != ESR_Failed && (!InnerScope.destroy() || !Scope.destroy())) | |||
5386 | return ESR_Failed; | |||
5387 | return ESR; | |||
5388 | } | |||
5389 | ||||
5390 | // Loop body. | |||
5391 | ESR = EvaluateLoopBody(Result, Info, FS->getBody()); | |||
5392 | if (ESR != ESR_Continue) { | |||
5393 | if (ESR != ESR_Failed && (!InnerScope.destroy() || !Scope.destroy())) | |||
5394 | return ESR_Failed; | |||
5395 | return ESR; | |||
5396 | } | |||
5397 | if (FS->getInc()->isValueDependent()) { | |||
5398 | if (!EvaluateDependentExpr(FS->getInc(), Info)) | |||
5399 | return ESR_Failed; | |||
5400 | } else { | |||
5401 | // Increment: ++__begin | |||
5402 | if (!EvaluateIgnoredValue(Info, FS->getInc())) | |||
5403 | return ESR_Failed; | |||
5404 | } | |||
5405 | ||||
5406 | if (!InnerScope.destroy()) | |||
5407 | return ESR_Failed; | |||
5408 | } | |||
5409 | ||||
5410 | return Scope.destroy() ? ESR_Succeeded : ESR_Failed; | |||
5411 | } | |||
5412 | ||||
5413 | case Stmt::SwitchStmtClass: | |||
5414 | return EvaluateSwitch(Result, Info, cast<SwitchStmt>(S)); | |||
5415 | ||||
5416 | case Stmt::ContinueStmtClass: | |||
5417 | return ESR_Continue; | |||
5418 | ||||
5419 | case Stmt::BreakStmtClass: | |||
5420 | return ESR_Break; | |||
5421 | ||||
5422 | case Stmt::LabelStmtClass: | |||
5423 | return EvaluateStmt(Result, Info, cast<LabelStmt>(S)->getSubStmt(), Case); | |||
5424 | ||||
5425 | case Stmt::AttributedStmtClass: | |||
5426 | // As a general principle, C++11 attributes can be ignored without | |||
5427 | // any semantic impact. | |||
5428 | return EvaluateStmt(Result, Info, cast<AttributedStmt>(S)->getSubStmt(), | |||
5429 | Case); | |||
5430 | ||||
5431 | case Stmt::CaseStmtClass: | |||
5432 | case Stmt::DefaultStmtClass: | |||
5433 | return EvaluateStmt(Result, Info, cast<SwitchCase>(S)->getSubStmt(), Case); | |||
5434 | case Stmt::CXXTryStmtClass: | |||
5435 | // Evaluate try blocks by evaluating all sub statements. | |||
5436 | return EvaluateStmt(Result, Info, cast<CXXTryStmt>(S)->getTryBlock(), Case); | |||
5437 | } | |||
5438 | } | |||
5439 | ||||
5440 | /// CheckTrivialDefaultConstructor - Check whether a constructor is a trivial | |||
5441 | /// default constructor. If so, we'll fold it whether or not it's marked as | |||
5442 | /// constexpr. If it is marked as constexpr, we will never implicitly define it, | |||
5443 | /// so we need special handling. | |||
5444 | static bool CheckTrivialDefaultConstructor(EvalInfo &Info, SourceLocation Loc, | |||
5445 | const CXXConstructorDecl *CD, | |||
5446 | bool IsValueInitialization) { | |||
5447 | if (!CD->isTrivial() || !CD->isDefaultConstructor()) | |||
5448 | return false; | |||
5449 | ||||
5450 | // Value-initialization does not call a trivial default constructor, so such a | |||
5451 | // call is a core constant expression whether or not the constructor is | |||
5452 | // constexpr. | |||
5453 | if (!CD->isConstexpr() && !IsValueInitialization) { | |||
5454 | if (Info.getLangOpts().CPlusPlus11) { | |||
5455 | // FIXME: If DiagDecl is an implicitly-declared special member function, | |||
5456 | // we should be much more explicit about why it's not constexpr. | |||
5457 | Info.CCEDiag(Loc, diag::note_constexpr_invalid_function, 1) | |||
5458 | << /*IsConstexpr*/0 << /*IsConstructor*/1 << CD; | |||
5459 | Info.Note(CD->getLocation(), diag::note_declared_at); | |||
5460 | } else { | |||
5461 | Info.CCEDiag(Loc, diag::note_invalid_subexpr_in_const_expr); | |||
5462 | } | |||
5463 | } | |||
5464 | return true; | |||
5465 | } | |||
5466 | ||||
5467 | /// CheckConstexprFunction - Check that a function can be called in a constant | |||
5468 | /// expression. | |||
5469 | static bool CheckConstexprFunction(EvalInfo &Info, SourceLocation CallLoc, | |||
5470 | const FunctionDecl *Declaration, | |||
5471 | const FunctionDecl *Definition, | |||
5472 | const Stmt *Body) { | |||
5473 | // Potential constant expressions can contain calls to declared, but not yet | |||
5474 | // defined, constexpr functions. | |||
5475 | if (Info.checkingPotentialConstantExpression() && !Definition && | |||
5476 | Declaration->isConstexpr()) | |||
5477 | return false; | |||
5478 | ||||
5479 | // Bail out if the function declaration itself is invalid. We will | |||
5480 | // have produced a relevant diagnostic while parsing it, so just | |||
5481 | // note the problematic sub-expression. | |||
5482 | if (Declaration->isInvalidDecl()) { | |||
5483 | Info.FFDiag(CallLoc, diag::note_invalid_subexpr_in_const_expr); | |||
5484 | return false; | |||
5485 | } | |||
5486 | ||||
5487 | // DR1872: An instantiated virtual constexpr function can't be called in a | |||
5488 | // constant expression (prior to C++20). We can still constant-fold such a | |||
5489 | // call. | |||
5490 | if (!Info.Ctx.getLangOpts().CPlusPlus20 && isa<CXXMethodDecl>(Declaration) && | |||
5491 | cast<CXXMethodDecl>(Declaration)->isVirtual()) | |||
5492 | Info.CCEDiag(CallLoc, diag::note_constexpr_virtual_call); | |||
5493 | ||||
5494 | if (Definition && Definition->isInvalidDecl()) { | |||
5495 | Info.FFDiag(CallLoc, diag::note_invalid_subexpr_in_const_expr); | |||
5496 | return false; | |||
5497 | } | |||
5498 | ||||
5499 | // Can we evaluate this function call? | |||
5500 | if (Definition && Definition->isConstexpr() && Body) | |||
5501 | return true; | |||
5502 | ||||
5503 | if (Info.getLangOpts().CPlusPlus11) { | |||
5504 | const FunctionDecl *DiagDecl = Definition ? Definition : Declaration; | |||
5505 | ||||
5506 | // If this function is not constexpr because it is an inherited | |||
5507 | // non-constexpr constructor, diagnose that directly. | |||
5508 | auto *CD = dyn_cast<CXXConstructorDecl>(DiagDecl); | |||
5509 | if (CD && CD->isInheritingConstructor()) { | |||
5510 | auto *Inherited = CD->getInheritedConstructor().getConstructor(); | |||
5511 | if (!Inherited->isConstexpr()) | |||
5512 | DiagDecl = CD = Inherited; | |||
5513 | } | |||
5514 | ||||
5515 | // FIXME: If DiagDecl is an implicitly-declared special member function | |||
5516 | // or an inheriting constructor, we should be much more explicit about why | |||
5517 | // it's not constexpr. | |||
5518 | if (CD && CD->isInheritingConstructor()) | |||
5519 | Info.FFDiag(CallLoc, diag::note_constexpr_invalid_inhctor, 1) | |||
5520 | << CD->getInheritedConstructor().getConstructor()->getParent(); | |||
5521 | else | |||
5522 | Info.FFDiag(CallLoc, diag::note_constexpr_invalid_function, 1) | |||
5523 | << DiagDecl->isConstexpr() << (bool)CD << DiagDecl; | |||
5524 | Info.Note(DiagDecl->getLocation(), diag::note_declared_at); | |||
5525 | } else { | |||
5526 | Info.FFDiag(CallLoc, diag::note_invalid_subexpr_in_const_expr); | |||
5527 | } | |||
5528 | return false; | |||
5529 | } | |||
5530 | ||||
5531 | namespace { | |||
5532 | struct CheckDynamicTypeHandler { | |||
5533 | AccessKinds AccessKind; | |||
5534 | typedef bool result_type; | |||
5535 | bool failed() { return false; } | |||
5536 | bool found(APValue &Subobj, QualType SubobjType) { return true; } | |||
5537 | bool found(APSInt &Value, QualType SubobjType) { return true; } | |||
5538 | bool found(APFloat &Value, QualType SubobjType) { return true; } | |||
5539 | }; | |||
5540 | } // end anonymous namespace | |||
5541 | ||||
5542 | /// Check that we can access the notional vptr of an object / determine its | |||
5543 | /// dynamic type. | |||
5544 | static bool checkDynamicType(EvalInfo &Info, const Expr *E, const LValue &This, | |||
5545 | AccessKinds AK, bool Polymorphic) { | |||
5546 | if (This.Designator.Invalid) | |||
5547 | return false; | |||
5548 | ||||
5549 | CompleteObject Obj = findCompleteObject(Info, E, AK, This, QualType()); | |||
5550 | ||||
5551 | if (!Obj) | |||
5552 | return false; | |||
5553 | ||||
5554 | if (!Obj.Value) { | |||
5555 | // The object is not usable in constant expressions, so we can't inspect | |||
5556 | // its value to see if it's in-lifetime or what the active union members | |||
5557 | // are. We can still check for a one-past-the-end lvalue. | |||
5558 | if (This.Designator.isOnePastTheEnd() || | |||
5559 | This.Designator.isMostDerivedAnUnsizedArray()) { | |||
5560 | Info.FFDiag(E, This.Designator.isOnePastTheEnd() | |||
5561 | ? diag::note_constexpr_access_past_end | |||
5562 | : diag::note_constexpr_access_unsized_array) | |||
5563 | << AK; | |||
5564 | return false; | |||
5565 | } else if (Polymorphic) { | |||
5566 | // Conservatively refuse to perform a polymorphic operation if we would | |||
5567 | // not be able to read a notional 'vptr' value. | |||
5568 | APValue Val; | |||
5569 | This.moveInto(Val); | |||
5570 | QualType StarThisType = | |||
5571 | Info.Ctx.getLValueReferenceType(This.Designator.getType(Info.Ctx)); | |||
5572 | Info.FFDiag(E, diag::note_constexpr_polymorphic_unknown_dynamic_type) | |||
5573 | << AK << Val.getAsString(Info.Ctx, StarThisType); | |||
5574 | return false; | |||
5575 | } | |||
5576 | return true; | |||
5577 | } | |||
5578 | ||||
5579 | CheckDynamicTypeHandler Handler{AK}; | |||
5580 | return Obj && findSubobject(Info, E, Obj, This.Designator, Handler); | |||
5581 | } | |||
5582 | ||||
5583 | /// Check that the pointee of the 'this' pointer in a member function call is | |||
5584 | /// either within its lifetime or in its period of construction or destruction. | |||
5585 | static bool | |||
5586 | checkNonVirtualMemberCallThisPointer(EvalInfo &Info, const Expr *E, | |||
5587 | const LValue &This, | |||
5588 | const CXXMethodDecl *NamedMember) { | |||
5589 | return checkDynamicType( | |||
5590 | Info, E, This, | |||
5591 | isa<CXXDestructorDecl>(NamedMember) ? AK_Destroy : AK_MemberCall, false); | |||
5592 | } | |||
5593 | ||||
5594 | struct DynamicType { | |||
5595 | /// The dynamic class type of the object. | |||
5596 | const CXXRecordDecl *Type; | |||
5597 | /// The corresponding path length in the lvalue. | |||
5598 | unsigned PathLength; | |||
5599 | }; | |||
5600 | ||||
5601 | static const CXXRecordDecl *getBaseClassType(SubobjectDesignator &Designator, | |||
5602 | unsigned PathLength) { | |||
5603 | assert(PathLength >= Designator.MostDerivedPathLength && PathLength <=(static_cast <bool> (PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && "invalid path length") ? void (0) : __assert_fail ("PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && \"invalid path length\"" , "clang/lib/AST/ExprConstant.cpp", 5604, __extension__ __PRETTY_FUNCTION__ )) | |||
5604 | Designator.Entries.size() && "invalid path length")(static_cast <bool> (PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && "invalid path length") ? void (0) : __assert_fail ("PathLength >= Designator.MostDerivedPathLength && PathLength <= Designator.Entries.size() && \"invalid path length\"" , "clang/lib/AST/ExprConstant.cpp", 5604, __extension__ __PRETTY_FUNCTION__ )); | |||
5605 | return (PathLength == Designator.MostDerivedPathLength) | |||
5606 | ? Designator.MostDerivedType->getAsCXXRecordDecl() | |||
5607 | : getAsBaseClass(Designator.Entries[PathLength - 1]); | |||
5608 | } | |||
5609 | ||||
5610 | /// Determine the dynamic type of an object. | |||
5611 | static Optional<DynamicType> ComputeDynamicType(EvalInfo &Info, const Expr *E, | |||
5612 | LValue &This, AccessKinds AK) { | |||
5613 | // If we don't have an lvalue denoting an object of class type, there is no | |||
5614 | // meaningful dynamic type. (We consider objects of non-class type to have no | |||
5615 | // dynamic type.) | |||
5616 | if (!checkDynamicType(Info, E, This, AK, true)) | |||
5617 | return None; | |||
5618 | ||||
5619 | // Refuse to compute a dynamic type in the presence of virtual bases. This | |||
5620 | // shouldn't happen other than in constant-folding situations, since literal | |||
5621 | // types can't have virtual bases. | |||
5622 | // | |||
5623 | // Note that consumers of DynamicType assume that the type has no virtual | |||
5624 | // bases, and will need modifications if this restriction is relaxed. | |||
5625 | const CXXRecordDecl *Class = | |||
5626 | This.Designator.MostDerivedType->getAsCXXRecordDecl(); | |||
5627 | if (!Class || Class->getNumVBases()) { | |||
5628 | Info.FFDiag(E); | |||
5629 | return None; | |||
5630 | } | |||
5631 | ||||
5632 | // FIXME: For very deep class hierarchies, it might be beneficial to use a | |||
5633 | // binary search here instead. But the overwhelmingly common case is that | |||
5634 | // we're not in the middle of a constructor, so it probably doesn't matter | |||
5635 | // in practice. | |||
5636 | ArrayRef<APValue::LValuePathEntry> Path = This.Designator.Entries; | |||
5637 | for (unsigned PathLength = This.Designator.MostDerivedPathLength; | |||
5638 | PathLength <= Path.size(); ++PathLength) { | |||
5639 | switch (Info.isEvaluatingCtorDtor(This.getLValueBase(), | |||
5640 | Path.slice(0, PathLength))) { | |||
5641 | case ConstructionPhase::Bases: | |||
5642 | case ConstructionPhase::DestroyingBases: | |||
5643 | // We're constructing or destroying a base class. This is not the dynamic | |||
5644 | // type. | |||
5645 | break; | |||
5646 | ||||
5647 | case ConstructionPhase::None: | |||
5648 | case ConstructionPhase::AfterBases: | |||
5649 | case ConstructionPhase::AfterFields: | |||
5650 | case ConstructionPhase::Destroying: | |||
5651 | // We've finished constructing the base classes and not yet started | |||
5652 | // destroying them again, so this is the dynamic type. | |||
5653 | return DynamicType{getBaseClassType(This.Designator, PathLength), | |||
5654 | PathLength}; | |||
5655 | } | |||
5656 | } | |||
5657 | ||||
5658 | // CWG issue 1517: we're constructing a base class of the object described by | |||
5659 | // 'This', so that object has not yet begun its period of construction and | |||
5660 | // any polymorphic operation on it results in undefined behavior. | |||
5661 | Info.FFDiag(E); | |||
5662 | return None; | |||
5663 | } | |||
5664 | ||||
5665 | /// Perform virtual dispatch. | |||
5666 | static const CXXMethodDecl *HandleVirtualDispatch( | |||
5667 | EvalInfo &Info, const Expr *E, LValue &This, const CXXMethodDecl *Found, | |||
5668 | llvm::SmallVectorImpl<QualType> &CovariantAdjustmentPath) { | |||
5669 | Optional<DynamicType> DynType = ComputeDynamicType( | |||
5670 | Info, E, This, | |||
5671 | isa<CXXDestructorDecl>(Found) ? AK_Destroy : AK_MemberCall); | |||
5672 | if (!DynType) | |||
5673 | return nullptr; | |||
5674 | ||||
5675 | // Find the final overrider. It must be declared in one of the classes on the | |||
5676 | // path from the dynamic type to the static type. | |||
5677 | // FIXME: If we ever allow literal types to have virtual base classes, that | |||
5678 | // won't be true. | |||
5679 | const CXXMethodDecl *Callee = Found; | |||
5680 | unsigned PathLength = DynType->PathLength; | |||
5681 | for (/**/; PathLength <= This.Designator.Entries.size(); ++PathLength) { | |||
5682 | const CXXRecordDecl *Class = getBaseClassType(This.Designator, PathLength); | |||
5683 | const CXXMethodDecl *Overrider = | |||
5684 | Found->getCorrespondingMethodDeclaredInClass(Class, false); | |||
5685 | if (Overrider) { | |||
5686 | Callee = Overrider; | |||
5687 | break; | |||
5688 | } | |||
5689 | } | |||
5690 | ||||
5691 | // C++2a [class.abstract]p6: | |||
5692 | // the effect of making a virtual call to a pure virtual function [...] is | |||
5693 | // undefined | |||
5694 | if (Callee->isPure()) { | |||
5695 | Info.FFDiag(E, diag::note_constexpr_pure_virtual_call, 1) << Callee; | |||
5696 | Info.Note(Callee->getLocation(), diag::note_declared_at); | |||
5697 | return nullptr; | |||
5698 | } | |||
5699 | ||||
5700 | // If necessary, walk the rest of the path to determine the sequence of | |||
5701 | // covariant adjustment steps to apply. | |||
5702 | if (!Info.Ctx.hasSameUnqualifiedType(Callee->getReturnType(), | |||
5703 | Found->getReturnType())) { | |||
5704 | CovariantAdjustmentPath.push_back(Callee->getReturnType()); | |||
5705 | for (unsigned CovariantPathLength = PathLength + 1; | |||
5706 | CovariantPathLength != This.Designator.Entries.size(); | |||
5707 | ++CovariantPathLength) { | |||
5708 | const CXXRecordDecl *NextClass = | |||
5709 | getBaseClassType(This.Designator, CovariantPathLength); | |||
5710 | const CXXMethodDecl *Next = | |||
5711 | Found->getCorrespondingMethodDeclaredInClass(NextClass, false); | |||
5712 | if (Next && !Info.Ctx.hasSameUnqualifiedType( | |||
5713 | Next->getReturnType(), CovariantAdjustmentPath.back())) | |||
5714 | CovariantAdjustmentPath.push_back(Next->getReturnType()); | |||
5715 | } | |||
5716 | if (!Info.Ctx.hasSameUnqualifiedType(Found->getReturnType(), | |||
5717 | CovariantAdjustmentPath.back())) | |||
5718 | CovariantAdjustmentPath.push_back(Found->getReturnType()); | |||
5719 | } | |||
5720 | ||||
5721 | // Perform 'this' adjustment. | |||
5722 | if (!CastToDerivedClass(Info, E, This, Callee->getParent(), PathLength)) | |||
5723 | return nullptr; | |||
5724 | ||||
5725 | return Callee; | |||
5726 | } | |||
5727 | ||||
5728 | /// Perform the adjustment from a value returned by a virtual function to | |||
5729 | /// a value of the statically expected type, which may be a pointer or | |||
5730 | /// reference to a base class of the returned type. | |||
5731 | static bool HandleCovariantReturnAdjustment(EvalInfo &Info, const Expr *E, | |||
5732 | APValue &Result, | |||
5733 | ArrayRef<QualType> Path) { | |||
5734 | assert(Result.isLValue() &&(static_cast <bool> (Result.isLValue() && "unexpected kind of APValue for covariant return" ) ? void (0) : __assert_fail ("Result.isLValue() && \"unexpected kind of APValue for covariant return\"" , "clang/lib/AST/ExprConstant.cpp", 5735, __extension__ __PRETTY_FUNCTION__ )) | |||
5735 | "unexpected kind of APValue for covariant return")(static_cast <bool> (Result.isLValue() && "unexpected kind of APValue for covariant return" ) ? void (0) : __assert_fail ("Result.isLValue() && \"unexpected kind of APValue for covariant return\"" , "clang/lib/AST/ExprConstant.cpp", 5735, __extension__ __PRETTY_FUNCTION__ )); | |||
5736 | if (Result.isNullPointer()) | |||
5737 | return true; | |||
5738 | ||||
5739 | LValue LVal; | |||
5740 | LVal.setFrom(Info.Ctx, Result); | |||
5741 | ||||
5742 | const CXXRecordDecl *OldClass = Path[0]->getPointeeCXXRecordDecl(); | |||
5743 | for (unsigned I = 1; I != Path.size(); ++I) { | |||
5744 | const CXXRecordDecl *NewClass = Path[I]->getPointeeCXXRecordDecl(); | |||
5745 | assert(OldClass && NewClass && "unexpected kind of covariant return")(static_cast <bool> (OldClass && NewClass && "unexpected kind of covariant return") ? void (0) : __assert_fail ("OldClass && NewClass && \"unexpected kind of covariant return\"" , "clang/lib/AST/ExprConstant.cpp", 5745, __extension__ __PRETTY_FUNCTION__ )); | |||
5746 | if (OldClass != NewClass && | |||
5747 | !CastToBaseClass(Info, E, LVal, OldClass, NewClass)) | |||
5748 | return false; | |||
5749 | OldClass = NewClass; | |||
5750 | } | |||
5751 | ||||
5752 | LVal.moveInto(Result); | |||
5753 | return true; | |||
5754 | } | |||
5755 | ||||
5756 | /// Determine whether \p Base, which is known to be a direct base class of | |||
5757 | /// \p Derived, is a public base class. | |||
5758 | static bool isBaseClassPublic(const CXXRecordDecl *Derived, | |||
5759 | const CXXRecordDecl *Base) { | |||
5760 | for (const CXXBaseSpecifier &BaseSpec : Derived->bases()) { | |||
5761 | auto *BaseClass = BaseSpec.getType()->getAsCXXRecordDecl(); | |||
5762 | if (BaseClass && declaresSameEntity(BaseClass, Base)) | |||
5763 | return BaseSpec.getAccessSpecifier() == AS_public; | |||
5764 | } | |||
5765 | llvm_unreachable("Base is not a direct base of Derived")::llvm::llvm_unreachable_internal("Base is not a direct base of Derived" , "clang/lib/AST/ExprConstant.cpp", 5765); | |||
5766 | } | |||
5767 | ||||
5768 | /// Apply the given dynamic cast operation on the provided lvalue. | |||
5769 | /// | |||
5770 | /// This implements the hard case of dynamic_cast, requiring a "runtime check" | |||
5771 | /// to find a suitable target subobject. | |||
5772 | static bool HandleDynamicCast(EvalInfo &Info, const ExplicitCastExpr *E, | |||
5773 | LValue &Ptr) { | |||
5774 | // We can't do anything with a non-symbolic pointer value. | |||
5775 | SubobjectDesignator &D = Ptr.Designator; | |||
5776 | if (D.Invalid) | |||
5777 | return false; | |||
5778 | ||||
5779 | // C++ [expr.dynamic.cast]p6: | |||
5780 | // If v is a null pointer value, the result is a null pointer value. | |||
5781 | if (Ptr.isNullPointer() && !E->isGLValue()) | |||
5782 | return true; | |||
5783 | ||||
5784 | // For all the other cases, we need the pointer to point to an object within | |||
5785 | // its lifetime / period of construction / destruction, and we need to know | |||
5786 | // its dynamic type. | |||
5787 | Optional<DynamicType> DynType = | |||
5788 | ComputeDynamicType(Info, E, Ptr, AK_DynamicCast); | |||
5789 | if (!DynType) | |||
5790 | return false; | |||
5791 | ||||
5792 | // C++ [expr.dynamic.cast]p7: | |||
5793 | // If T is "pointer to cv void", then the result is a pointer to the most | |||
5794 | // derived object | |||
5795 | if (E->getType()->isVoidPointerType()) | |||
5796 | return CastToDerivedClass(Info, E, Ptr, DynType->Type, DynType->PathLength); | |||
5797 | ||||
5798 | const CXXRecordDecl *C = E->getTypeAsWritten()->getPointeeCXXRecordDecl(); | |||
5799 | assert(C && "dynamic_cast target is not void pointer nor class")(static_cast <bool> (C && "dynamic_cast target is not void pointer nor class" ) ? void (0) : __assert_fail ("C && \"dynamic_cast target is not void pointer nor class\"" , "clang/lib/AST/ExprConstant.cpp", 5799, __extension__ __PRETTY_FUNCTION__ )); | |||
5800 | CanQualType CQT = Info.Ctx.getCanonicalType(Info.Ctx.getRecordType(C)); | |||
5801 | ||||
5802 | auto RuntimeCheckFailed = [&] (CXXBasePaths *Paths) { | |||
5803 | // C++ [expr.dynamic.cast]p9: | |||
5804 | if (!E->isGLValue()) { | |||
5805 | // The value of a failed cast to pointer type is the null pointer value | |||
5806 | // of the required result type. | |||
5807 | Ptr.setNull(Info.Ctx, E->getType()); | |||
5808 | return true; | |||
5809 | } | |||
5810 | ||||
5811 | // A failed cast to reference type throws [...] std::bad_cast. | |||
5812 | unsigned DiagKind; | |||
5813 | if (!Paths && (declaresSameEntity(DynType->Type, C) || | |||
5814 | DynType->Type->isDerivedFrom(C))) | |||
5815 | DiagKind = 0; | |||
5816 | else if (!Paths || Paths->begin() == Paths->end()) | |||
5817 | DiagKind = 1; | |||
5818 | else if (Paths->isAmbiguous(CQT)) | |||
5819 | DiagKind = 2; | |||
5820 | else { | |||
5821 | assert(Paths->front().Access != AS_public && "why did the cast fail?")(static_cast <bool> (Paths->front().Access != AS_public && "why did the cast fail?") ? void (0) : __assert_fail ("Paths->front().Access != AS_public && \"why did the cast fail?\"" , "clang/lib/AST/ExprConstant.cpp", 5821, __extension__ __PRETTY_FUNCTION__ )); | |||
5822 | DiagKind = 3; | |||
5823 | } | |||
5824 | Info.FFDiag(E, diag::note_constexpr_dynamic_cast_to_reference_failed) | |||
5825 | << DiagKind << Ptr.Designator.getType(Info.Ctx) | |||
5826 | << Info.Ctx.getRecordType(DynType->Type) | |||
5827 | << E->getType().getUnqualifiedType(); | |||
5828 | return false; | |||
5829 | }; | |||
5830 | ||||
5831 | // Runtime check, phase 1: | |||
5832 | // Walk from the base subobject towards the derived object looking for the | |||
5833 | // target type. | |||
5834 | for (int PathLength = Ptr.Designator.Entries.size(); | |||
5835 | PathLength >= (int)DynType->PathLength; --PathLength) { | |||
5836 | const CXXRecordDecl *Class = getBaseClassType(Ptr.Designator, PathLength); | |||
5837 | if (declaresSameEntity(Class, C)) | |||
5838 | return CastToDerivedClass(Info, E, Ptr, Class, PathLength); | |||
5839 | // We can only walk across public inheritance edges. | |||
5840 | if (PathLength > (int)DynType->PathLength && | |||
5841 | !isBaseClassPublic(getBaseClassType(Ptr.Designator, PathLength - 1), | |||
5842 | Class)) | |||
5843 | return RuntimeCheckFailed(nullptr); | |||
5844 | } | |||
5845 | ||||
5846 | // Runtime check, phase 2: | |||
5847 | // Search the dynamic type for an unambiguous public base of type C. | |||
5848 | CXXBasePaths Paths(/*FindAmbiguities=*/true, | |||
5849 | /*RecordPaths=*/true, /*DetectVirtual=*/false); | |||
5850 | if (DynType->Type->isDerivedFrom(C, Paths) && !Paths.isAmbiguous(CQT) && | |||
| ||||
5851 | Paths.front().Access == AS_public) { | |||
5852 | // Downcast to the dynamic type... | |||
5853 | if (!CastToDerivedClass(Info, E, Ptr, DynType->Type, DynType->PathLength)) | |||
5854 | return false; | |||
5855 | // ... then upcast to the chosen base class subobject. | |||
5856 | for (CXXBasePathElement &Elem : Paths.front()) | |||
5857 | if (!HandleLValueBase(Info, E, Ptr, Elem.Class, Elem.Base)) | |||
5858 | return false; | |||
5859 | return true; | |||
5860 | } | |||
5861 | ||||
5862 | // Otherwise, the runtime check fails. | |||
5863 | return RuntimeCheckFailed(&Paths); | |||
5864 | } | |||
5865 | ||||
5866 | namespace { | |||
5867 | struct StartLifetimeOfUnionMemberHandler { | |||
5868 | EvalInfo &Info; | |||
5869 | const Expr *LHSExpr; | |||
5870 | const FieldDecl *Field; | |||
5871 | bool DuringInit; | |||
5872 | bool Failed = false; | |||
5873 | static const AccessKinds AccessKind = AK_Assign; | |||
5874 | ||||
5875 | typedef bool result_type; | |||
5876 | bool failed() { return Failed; } | |||
5877 | bool found(APValue &Subobj, QualType SubobjType) { | |||
5878 | // We are supposed to perform no initialization but begin the lifetime of | |||
5879 | // the object. We interpret that as meaning to do what default | |||
5880 | // initialization of the object would do if all constructors involved were | |||
5881 | // trivial: | |||
5882 | // * All base, non-variant member, and array element subobjects' lifetimes | |||
5883 | // begin | |||
5884 | // * No variant members' lifetimes begin | |||
5885 | // * All scalar subobjects whose lifetimes begin have indeterminate values | |||
5886 | assert(SubobjType->isUnionType())(static_cast <bool> (SubobjType->isUnionType()) ? void (0) : __assert_fail ("SubobjType->isUnionType()", "clang/lib/AST/ExprConstant.cpp" , 5886, __extension__ __PRETTY_FUNCTION__)); | |||
5887 | if (declaresSameEntity(Subobj.getUnionField(), Field)) { | |||
5888 | // This union member is already active. If it's also in-lifetime, there's | |||
5889 | // nothing to do. | |||
5890 | if (Subobj.getUnionValue().hasValue()) | |||
5891 | return true; | |||
5892 | } else if (DuringInit) { | |||
5893 | // We're currently in the process of initializing a different union | |||
5894 | // member. If we carried on, that initialization would attempt to | |||
5895 | // store to an inactive union member, resulting in undefined behavior. | |||
5896 | Info.FFDiag(LHSExpr, | |||
5897 | diag::note_constexpr_union_member_change_during_init); | |||
5898 | return false; | |||
5899 | } | |||
5900 | APValue Result; | |||
5901 | Failed = !getDefaultInitValue(Field->getType(), Result); | |||
5902 | Subobj.setUnion(Field, Result); | |||
5903 | return true; | |||
5904 | } | |||
5905 | bool found(APSInt &Value, QualType SubobjType) { | |||
5906 | llvm_unreachable("wrong value kind for union object")::llvm::llvm_unreachable_internal("wrong value kind for union object" , "clang/lib/AST/ExprConstant.cpp", 5906); | |||
5907 | } | |||
5908 | bool found(APFloat &Value, QualType SubobjType) { | |||
5909 | llvm_unreachable("wrong value kind for union object")::llvm::llvm_unreachable_internal("wrong value kind for union object" , "clang/lib/AST/ExprConstant.cpp", 5909); | |||
5910 | } | |||
5911 | }; | |||
5912 | } // end anonymous namespace | |||
5913 | ||||
5914 | const AccessKinds StartLifetimeOfUnionMemberHandler::AccessKind; | |||
5915 | ||||
5916 | /// Handle a builtin simple-assignment or a call to a trivial assignment | |||
5917 | /// operator whose left-hand side might involve a union member access. If it | |||
5918 | /// does, implicitly start the lifetime of any accessed union elements per | |||
5919 | /// C++20 [class.union]5. | |||
5920 | static bool HandleUnionActiveMemberChange(EvalInfo &Info, const Expr *LHSExpr, | |||
5921 | const LValue &LHS) { | |||
5922 | if (LHS.InvalidBase || LHS.Designator.Invalid) | |||
5923 | return false; | |||
5924 | ||||
5925 | llvm::SmallVector<std::pair<unsigned, const FieldDecl*>, 4> UnionPathLengths; | |||
5926 | // C++ [class.union]p5: | |||
5927 | // define the set S(E) of subexpressions of E as follows: | |||
5928 | unsigned PathLength = LHS.Designator.Entries.size(); | |||
5929 | for (const Expr *E = LHSExpr; E != nullptr;) { | |||
5930 | // -- If E is of the form A.B, S(E) contains the elements of S(A)... | |||
5931 | if (auto *ME = dyn_cast<MemberExpr>(E)) { | |||
5932 | auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()); | |||
5933 | // Note that we can't implicitly start the lifetime of a reference, | |||
5934 | // so we don't need to proceed any further if we reach one. | |||
5935 | if (!FD || FD->getType()->isReferenceType()) | |||
5936 | break; | |||
5937 | ||||
5938 | // ... and also contains A.B if B names a union member ... | |||
5939 | if (FD->getParent()->isUnion()) { | |||
5940 | // ... of a non-class, non-array type, or of a class type with a | |||
5941 | // trivial default constructor that is not deleted, or an array of | |||
5942 | // such types. | |||
5943 | auto *RD = | |||
5944 | FD->getType()->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); | |||
5945 | if (!RD || RD->hasTrivialDefaultConstructor()) | |||
5946 | UnionPathLengths.push_back({PathLength - 1, FD}); | |||
5947 | } | |||
5948 | ||||
5949 | E = ME->getBase(); | |||
5950 | --PathLength; | |||
5951 | assert(declaresSameEntity(FD,(static_cast <bool> (declaresSameEntity(FD, LHS.Designator .Entries[PathLength] .getAsBaseOrMember().getPointer())) ? void (0) : __assert_fail ("declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "clang/lib/AST/ExprConstant.cpp", 5953, __extension__ __PRETTY_FUNCTION__ )) | |||
5952 | LHS.Designator.Entries[PathLength](static_cast <bool> (declaresSameEntity(FD, LHS.Designator .Entries[PathLength] .getAsBaseOrMember().getPointer())) ? void (0) : __assert_fail ("declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "clang/lib/AST/ExprConstant.cpp", 5953, __extension__ __PRETTY_FUNCTION__ )) | |||
5953 | .getAsBaseOrMember().getPointer()))(static_cast <bool> (declaresSameEntity(FD, LHS.Designator .Entries[PathLength] .getAsBaseOrMember().getPointer())) ? void (0) : __assert_fail ("declaresSameEntity(FD, LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "clang/lib/AST/ExprConstant.cpp", 5953, __extension__ __PRETTY_FUNCTION__ )); | |||
5954 | ||||
5955 | // -- If E is of the form A[B] and is interpreted as a built-in array | |||
5956 | // subscripting operator, S(E) is [S(the array operand, if any)]. | |||
5957 | } else if (auto *ASE = dyn_cast<ArraySubscriptExpr>(E)) { | |||
5958 | // Step over an ArrayToPointerDecay implicit cast. | |||
5959 | auto *Base = ASE->getBase()->IgnoreImplicit(); | |||
5960 | if (!Base->getType()->isArrayType()) | |||
5961 | break; | |||
5962 | ||||
5963 | E = Base; | |||
5964 | --PathLength; | |||
5965 | ||||
5966 | } else if (auto *ICE = dyn_cast<ImplicitCastExpr>(E)) { | |||
5967 | // Step over a derived-to-base conversion. | |||
5968 | E = ICE->getSubExpr(); | |||
5969 | if (ICE->getCastKind() == CK_NoOp) | |||
5970 | continue; | |||
5971 | if (ICE->getCastKind() != CK_DerivedToBase && | |||
5972 | ICE->getCastKind() != CK_UncheckedDerivedToBase) | |||
5973 | break; | |||
5974 | // Walk path backwards as we walk up from the base to the derived class. | |||
5975 | for (const CXXBaseSpecifier *Elt : llvm::reverse(ICE->path())) { | |||
5976 | --PathLength; | |||
5977 | (void)Elt; | |||
5978 | assert(declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(),(static_cast <bool> (declaresSameEntity(Elt->getType ()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength ] .getAsBaseOrMember().getPointer())) ? void (0) : __assert_fail ("declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "clang/lib/AST/ExprConstant.cpp", 5980, __extension__ __PRETTY_FUNCTION__ )) | |||
5979 | LHS.Designator.Entries[PathLength](static_cast <bool> (declaresSameEntity(Elt->getType ()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength ] .getAsBaseOrMember().getPointer())) ? void (0) : __assert_fail ("declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "clang/lib/AST/ExprConstant.cpp", 5980, __extension__ __PRETTY_FUNCTION__ )) | |||
5980 | .getAsBaseOrMember().getPointer()))(static_cast <bool> (declaresSameEntity(Elt->getType ()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength ] .getAsBaseOrMember().getPointer())) ? void (0) : __assert_fail ("declaresSameEntity(Elt->getType()->getAsCXXRecordDecl(), LHS.Designator.Entries[PathLength] .getAsBaseOrMember().getPointer())" , "clang/lib/AST/ExprConstant.cpp", 5980, __extension__ __PRETTY_FUNCTION__ )); | |||
5981 | } | |||
5982 | ||||
5983 | // -- Otherwise, S(E) is empty. | |||
5984 | } else { | |||
5985 | break; | |||
5986 | } | |||
5987 | } | |||
5988 | ||||
5989 | // Common case: no unions' lifetimes are started. | |||
5990 | if (UnionPathLengths.empty()) | |||
5991 | return true; | |||
5992 | ||||
5993 | // if modification of X [would access an inactive union member], an object | |||
5994 | // of the type of X is implicitly created | |||
5995 | CompleteObject Obj = | |||
5996 | findCompleteObject(Info, LHSExpr, AK_Assign, LHS, LHSExpr->getType()); | |||
5997 | if (!Obj) | |||
5998 | return false; | |||
5999 | for (std::pair<unsigned, const FieldDecl *> LengthAndField : | |||
6000 | llvm::reverse(UnionPathLengths)) { | |||
6001 | // Form a designator for the union object. | |||
6002 | SubobjectDesignator D = LHS.Designator; | |||
6003 | D.truncate(Info.Ctx, LHS.Base, LengthAndField.first); | |||
6004 | ||||
6005 | bool DuringInit = Info.isEvaluatingCtorDtor(LHS.Base, D.Entries) == | |||
6006 | ConstructionPhase::AfterBases; | |||
6007 | StartLifetimeOfUnionMemberHandler StartLifetime{ | |||
6008 | Info, LHSExpr, LengthAndField.second, DuringInit}; | |||
6009 | if (!findSubobject(Info, LHSExpr, Obj, D, StartLifetime)) | |||
6010 | return false; | |||
6011 | } | |||
6012 | ||||
6013 | return true; | |||
6014 | } | |||
6015 | ||||
6016 | static bool EvaluateCallArg(const ParmVarDecl *PVD, const Expr *Arg, | |||
6017 | CallRef Call, EvalInfo &Info, | |||
6018 | bool NonNull = false) { | |||
6019 | LValue LV; | |||
6020 | // Create the parameter slot and register its destruction. For a vararg | |||
6021 | // argument, create a temporary. | |||
6022 | // FIXME: For calling conventions that destroy parameters in the callee, | |||
6023 | // should we consider performing destruction when the function returns | |||
6024 | // instead? | |||
6025 | APValue &V = PVD ? Info.CurrentCall->createParam(Call, PVD, LV) | |||
6026 | : Info.CurrentCall->createTemporary(Arg, Arg->getType(), | |||
6027 | ScopeKind::Call, LV); | |||
6028 | if (!EvaluateInPlace(V, Info, LV, Arg)) | |||
6029 | return false; | |||
6030 | ||||
6031 | // Passing a null pointer to an __attribute__((nonnull)) parameter results in | |||
6032 | // undefined behavior, so is non-constant. | |||
6033 | if (NonNull && V.isLValue() && V.isNullPointer()) { | |||
6034 | Info.CCEDiag(Arg, diag::note_non_null_attribute_failed); | |||
6035 | return false; | |||
6036 | } | |||
6037 | ||||
6038 | return true; | |||
6039 | } | |||
6040 | ||||
6041 | /// Evaluate the arguments to a function call. | |||
6042 | static bool EvaluateArgs(ArrayRef<const Expr *> Args, CallRef Call, | |||
6043 | EvalInfo &Info, const FunctionDecl *Callee, | |||
6044 | bool RightToLeft = false) { | |||
6045 | bool Success = true; | |||
6046 | llvm::SmallBitVector ForbiddenNullArgs; | |||
6047 | if (Callee->hasAttr<NonNullAttr>()) { | |||
6048 | ForbiddenNullArgs.resize(Args.size()); | |||
6049 | for (const auto *Attr : Callee->specific_attrs<NonNullAttr>()) { | |||
6050 | if (!Attr->args_size()) { | |||
6051 | ForbiddenNullArgs.set(); | |||
6052 | break; | |||
6053 | } else | |||
6054 | for (auto Idx : Attr->args()) { | |||
6055 | unsigned ASTIdx = Idx.getASTIndex(); | |||
6056 | if (ASTIdx >= Args.size()) | |||
6057 | continue; | |||
6058 | ForbiddenNullArgs[ASTIdx] = true; | |||
6059 | } | |||
6060 | } | |||
6061 | } | |||
6062 | for (unsigned I = 0; I < Args.size(); I++) { | |||
6063 | unsigned Idx = RightToLeft ? Args.size() - I - 1 : I; | |||
6064 | const ParmVarDecl *PVD = | |||
6065 | Idx < Callee->getNumParams() ? Callee->getParamDecl(Idx) : nullptr; | |||
6066 | bool NonNull = !ForbiddenNullArgs.empty() && ForbiddenNullArgs[Idx]; | |||
6067 | if (!EvaluateCallArg(PVD, Args[Idx], Call, Info, NonNull)) { | |||
6068 | // If we're checking for a potential constant expression, evaluate all | |||
6069 | // initializers even if some of them fail. | |||
6070 | if (!Info.noteFailure()) | |||
6071 | return false; | |||
6072 | Success = false; | |||
6073 | } | |||
6074 | } | |||
6075 | return Success; | |||
6076 | } | |||
6077 | ||||
6078 | /// Perform a trivial copy from Param, which is the parameter of a copy or move | |||
6079 | /// constructor or assignment operator. | |||
6080 | static bool handleTrivialCopy(EvalInfo &Info, const ParmVarDecl *Param, | |||
6081 | const Expr *E, APValue &Result, | |||
6082 | bool CopyObjectRepresentation) { | |||
6083 | // Find the reference argument. | |||
6084 | CallStackFrame *Frame = Info.CurrentCall; | |||
6085 | APValue *RefValue = Info.getParamSlot(Frame->Arguments, Param); | |||
6086 | if (!RefValue) { | |||
6087 | Info.FFDiag(E); | |||
6088 | return false; | |||
6089 | } | |||
6090 | ||||
6091 | // Copy out the contents of the RHS object. | |||
6092 | LValue RefLValue; | |||
6093 | RefLValue.setFrom(Info.Ctx, *RefValue); | |||
6094 | return handleLValueToRValueConversion( | |||
6095 | Info, E, Param->getType().getNonReferenceType(), RefLValue, Result, | |||
6096 | CopyObjectRepresentation); | |||
6097 | } | |||
6098 | ||||
6099 | /// Evaluate a function call. | |||
6100 | static bool HandleFunctionCall(SourceLocation CallLoc, | |||
6101 | const FunctionDecl *Callee, const LValue *This, | |||
6102 | ArrayRef<const Expr *> Args, CallRef Call, | |||
6103 | const Stmt *Body, EvalInfo &Info, | |||
6104 | APValue &Result, const LValue *ResultSlot) { | |||
6105 | if (!Info.CheckCallLimit(CallLoc)) | |||
6106 | return false; | |||
6107 | ||||
6108 | CallStackFrame Frame(Info, CallLoc, Callee, This, Call); | |||
6109 | ||||
6110 | // For a trivial copy or move assignment, perform an APValue copy. This is | |||
6111 | // essential for unions, where the operations performed by the assignment | |||
6112 | // operator cannot be represented as statements. | |||
6113 | // | |||
6114 | // Skip this for non-union classes with no fields; in that case, the defaulted | |||
6115 | // copy/move does not actually read the object. | |||
6116 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Callee); | |||
6117 | if (MD && MD->isDefaulted() && | |||
6118 | (MD->getParent()->isUnion() || | |||
6119 | (MD->isTrivial() && | |||
6120 | isReadByLvalueToRvalueConversion(MD->getParent())))) { | |||
6121 | assert(This &&(static_cast <bool> (This && (MD->isCopyAssignmentOperator () || MD->isMoveAssignmentOperator())) ? void (0) : __assert_fail ("This && (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())" , "clang/lib/AST/ExprConstant.cpp", 6122, __extension__ __PRETTY_FUNCTION__ )) | |||
6122 | (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator()))(static_cast <bool> (This && (MD->isCopyAssignmentOperator () || MD->isMoveAssignmentOperator())) ? void (0) : __assert_fail ("This && (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())" , "clang/lib/AST/ExprConstant.cpp", 6122, __extension__ __PRETTY_FUNCTION__ )); | |||
6123 | APValue RHSValue; | |||
6124 | if (!handleTrivialCopy(Info, MD->getParamDecl(0), Args[0], RHSValue, | |||
6125 | MD->getParent()->isUnion())) | |||
6126 | return false; | |||
6127 | if (Info.getLangOpts().CPlusPlus20 && MD->isTrivial() && | |||
6128 | !HandleUnionActiveMemberChange(Info, Args[0], *This)) | |||
6129 | return false; | |||
6130 | if (!handleAssignment(Info, Args[0], *This, MD->getThisType(), | |||
6131 | RHSValue)) | |||
6132 | return false; | |||
6133 | This->moveInto(Result); | |||
6134 | return true; | |||
6135 | } else if (MD && isLambdaCallOperator(MD)) { | |||
6136 | // We're in a lambda; determine the lambda capture field maps unless we're | |||
6137 | // just constexpr checking a lambda's call operator. constexpr checking is | |||
6138 | // done before the captures have been added to the closure object (unless | |||
6139 | // we're inferring constexpr-ness), so we don't have access to them in this | |||
6140 | // case. But since we don't need the captures to constexpr check, we can | |||
6141 | // just ignore them. | |||
6142 | if (!Info.checkingPotentialConstantExpression()) | |||
6143 | MD->getParent()->getCaptureFields(Frame.LambdaCaptureFields, | |||
6144 | Frame.LambdaThisCaptureField); | |||
6145 | } | |||
6146 | ||||
6147 | StmtResult Ret = {Result, ResultSlot}; | |||
6148 | EvalStmtResult ESR = EvaluateStmt(Ret, Info, Body); | |||
6149 | if (ESR == ESR_Succeeded) { | |||
6150 | if (Callee->getReturnType()->isVoidType()) | |||
6151 | return true; | |||
6152 | Info.FFDiag(Callee->getEndLoc(), diag::note_constexpr_no_return); | |||
6153 | } | |||
6154 | return ESR == ESR_Returned; | |||
6155 | } | |||
6156 | ||||
6157 | /// Evaluate a constructor call. | |||
6158 | static bool HandleConstructorCall(const Expr *E, const LValue &This, | |||
6159 | CallRef Call, | |||
6160 | const CXXConstructorDecl *Definition, | |||
6161 | EvalInfo &Info, APValue &Result) { | |||
6162 | SourceLocation CallLoc = E->getExprLoc(); | |||
6163 | if (!Info.CheckCallLimit(CallLoc)) | |||
6164 | return false; | |||
6165 | ||||
6166 | const CXXRecordDecl *RD = Definition->getParent(); | |||
6167 | if (RD->getNumVBases()) { | |||
6168 | Info.FFDiag(CallLoc, diag::note_constexpr_virtual_base) << RD; | |||
6169 | return false; | |||
6170 | } | |||
6171 | ||||
6172 | EvalInfo::EvaluatingConstructorRAII EvalObj( | |||
6173 | Info, | |||
6174 | ObjectUnderConstruction{This.getLValueBase(), This.Designator.Entries}, | |||
6175 | RD->getNumBases()); | |||
6176 | CallStackFrame Frame(Info, CallLoc, Definition, &This, Call); | |||
6177 | ||||
6178 | // FIXME: Creating an APValue just to hold a nonexistent return value is | |||
6179 | // wasteful. | |||
6180 | APValue RetVal; | |||
6181 | StmtResult Ret = {RetVal, nullptr}; | |||
6182 | ||||
6183 | // If it's a delegating constructor, delegate. | |||
6184 | if (Definition->isDelegatingConstructor()) { | |||
6185 | CXXConstructorDecl::init_const_iterator I = Definition->init_begin(); | |||
6186 | if ((*I)->getInit()->isValueDependent()) { | |||
6187 | if (!EvaluateDependentExpr((*I)->getInit(), Info)) | |||
6188 | return false; | |||
6189 | } else { | |||
6190 | FullExpressionRAII InitScope(Info); | |||
6191 | if (!EvaluateInPlace(Result, Info, This, (*I)->getInit()) || | |||
6192 | !InitScope.destroy()) | |||
6193 | return false; | |||
6194 | } | |||
6195 | return EvaluateStmt(Ret, Info, Definition->getBody()) != ESR_Failed; | |||
6196 | } | |||
6197 | ||||
6198 | // For a trivial copy or move constructor, perform an APValue copy. This is | |||
6199 | // essential for unions (or classes with anonymous union members), where the | |||
6200 | // operations performed by the constructor cannot be represented by | |||
6201 | // ctor-initializers. | |||
6202 | // | |||
6203 | // Skip this for empty non-union classes; we should not perform an | |||
6204 | // lvalue-to-rvalue conversion on them because their copy constructor does not | |||
6205 | // actually read them. | |||
6206 | if (Definition->isDefaulted() && Definition->isCopyOrMoveConstructor() && | |||
6207 | (Definition->getParent()->isUnion() || | |||
6208 | (Definition->isTrivial() && | |||
6209 | isReadByLvalueToRvalueConversion(Definition->getParent())))) { | |||
6210 | return handleTrivialCopy(Info, Definition->getParamDecl(0), E, Result, | |||
6211 | Definition->getParent()->isUnion()); | |||
6212 | } | |||
6213 | ||||
6214 | // Reserve space for the struct members. | |||
6215 | if (!Result.hasValue()) { | |||
6216 | if (!RD->isUnion()) | |||
6217 | Result = APValue(APValue::UninitStruct(), RD->getNumBases(), | |||
6218 | std::distance(RD->field_begin(), RD->field_end())); | |||
6219 | else | |||
6220 | // A union starts with no active member. | |||
6221 | Result = APValue((const FieldDecl*)nullptr); | |||
6222 | } | |||
6223 | ||||
6224 | if (RD->isInvalidDecl()) return false; | |||
6225 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | |||
6226 | ||||
6227 | // A scope for temporaries lifetime-extended by reference members. | |||
6228 | BlockScopeRAII LifetimeExtendedScope(Info); | |||
6229 | ||||
6230 | bool Success = true; | |||
6231 | unsigned BasesSeen = 0; | |||
6232 | #ifndef NDEBUG | |||
6233 | CXXRecordDecl::base_class_const_iterator BaseIt = RD->bases_begin(); | |||
6234 | #endif | |||
6235 | CXXRecordDecl::field_iterator FieldIt = RD->field_begin(); | |||
6236 | auto SkipToField = [&](FieldDecl *FD, bool Indirect) { | |||
6237 | // We might be initializing the same field again if this is an indirect | |||
6238 | // field initialization. | |||
6239 | if (FieldIt == RD->field_end() || | |||
6240 | FieldIt->getFieldIndex() > FD->getFieldIndex()) { | |||
6241 | assert(Indirect && "fields out of order?")(static_cast <bool> (Indirect && "fields out of order?" ) ? void (0) : __assert_fail ("Indirect && \"fields out of order?\"" , "clang/lib/AST/ExprConstant.cpp", 6241, __extension__ __PRETTY_FUNCTION__ )); | |||
6242 | return; | |||
6243 | } | |||
6244 | ||||
6245 | // Default-initialize any fields with no explicit initializer. | |||
6246 | for (; !declaresSameEntity(*FieldIt, FD); ++FieldIt) { | |||
6247 | assert(FieldIt != RD->field_end() && "missing field?")(static_cast <bool> (FieldIt != RD->field_end() && "missing field?") ? void (0) : __assert_fail ("FieldIt != RD->field_end() && \"missing field?\"" , "clang/lib/AST/ExprConstant.cpp", 6247, __extension__ __PRETTY_FUNCTION__ )); | |||
6248 | if (!FieldIt->isUnnamedBitfield()) | |||
6249 | Success &= getDefaultInitValue( | |||
6250 | FieldIt->getType(), | |||
6251 | Result.getStructField(FieldIt->getFieldIndex())); | |||
6252 | } | |||
6253 | ++FieldIt; | |||
6254 | }; | |||
6255 | for (const auto *I : Definition->inits()) { | |||
6256 | LValue Subobject = This; | |||
6257 | LValue SubobjectParent = This; | |||
6258 | APValue *Value = &Result; | |||
6259 | ||||
6260 | // Determine the subobject to initialize. | |||
6261 | FieldDecl *FD = nullptr; | |||
6262 | if (I->isBaseInitializer()) { | |||
6263 | QualType BaseType(I->getBaseClass(), 0); | |||
6264 | #ifndef NDEBUG | |||
6265 | // Non-virtual base classes are initialized in the order in the class | |||
6266 | // definition. We have already checked for virtual base classes. | |||
6267 | assert(!BaseIt->isVirtual() && "virtual base for literal type")(static_cast <bool> (!BaseIt->isVirtual() && "virtual base for literal type") ? void (0) : __assert_fail ( "!BaseIt->isVirtual() && \"virtual base for literal type\"" , "clang/lib/AST/ExprConstant.cpp", 6267, __extension__ __PRETTY_FUNCTION__ )); | |||
6268 | assert(Info.Ctx.hasSameType(BaseIt->getType(), BaseType) &&(static_cast <bool> (Info.Ctx.hasSameType(BaseIt->getType (), BaseType) && "base class initializers not in expected order" ) ? void (0) : __assert_fail ("Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && \"base class initializers not in expected order\"" , "clang/lib/AST/ExprConstant.cpp", 6269, __extension__ __PRETTY_FUNCTION__ )) | |||
6269 | "base class initializers not in expected order")(static_cast <bool> (Info.Ctx.hasSameType(BaseIt->getType (), BaseType) && "base class initializers not in expected order" ) ? void (0) : __assert_fail ("Info.Ctx.hasSameType(BaseIt->getType(), BaseType) && \"base class initializers not in expected order\"" , "clang/lib/AST/ExprConstant.cpp", 6269, __extension__ __PRETTY_FUNCTION__ )); | |||
6270 | ++BaseIt; | |||
6271 | #endif | |||
6272 | if (!HandleLValueDirectBase(Info, I->getInit(), Subobject, RD, | |||
6273 | BaseType->getAsCXXRecordDecl(), &Layout)) | |||
6274 | return false; | |||
6275 | Value = &Result.getStructBase(BasesSeen++); | |||
6276 | } else if ((FD = I->getMember())) { | |||
6277 | if (!HandleLValueMember(Info, I->getInit(), Subobject, FD, &Layout)) | |||
6278 | return false; | |||
6279 | if (RD->isUnion()) { | |||
6280 | Result = APValue(FD); | |||
6281 | Value = &Result.getUnionValue(); | |||
6282 | } else { | |||
6283 | SkipToField(FD, false); | |||
6284 | Value = &Result.getStructField(FD->getFieldIndex()); | |||
6285 | } | |||
6286 | } else if (IndirectFieldDecl *IFD = I->getIndirectMember()) { | |||
6287 | // Walk the indirect field decl's chain to find the object to initialize, | |||
6288 | // and make sure we've initialized every step along it. | |||
6289 | auto IndirectFieldChain = IFD->chain(); | |||
6290 | for (auto *C : IndirectFieldChain) { | |||
6291 | FD = cast<FieldDecl>(C); | |||
6292 | CXXRecordDecl *CD = cast<CXXRecordDecl>(FD->getParent()); | |||
6293 | // Switch the union field if it differs. This happens if we had | |||
6294 | // preceding zero-initialization, and we're now initializing a union | |||
6295 | // subobject other than the first. | |||
6296 | // FIXME: In this case, the values of the other subobjects are | |||
6297 | // specified, since zero-initialization sets all padding bits to zero. | |||
6298 | if (!Value->hasValue() || | |||
6299 | (Value->isUnion() && Value->getUnionField() != FD)) { | |||
6300 | if (CD->isUnion()) | |||
6301 | *Value = APValue(FD); | |||
6302 | else | |||
6303 | // FIXME: This immediately starts the lifetime of all members of | |||
6304 | // an anonymous struct. It would be preferable to strictly start | |||
6305 | // member lifetime in initialization order. | |||
6306 | Success &= getDefaultInitValue(Info.Ctx.getRecordType(CD), *Value); | |||
6307 | } | |||
6308 | // Store Subobject as its parent before updating it for the last element | |||
6309 | // in the chain. | |||
6310 | if (C == IndirectFieldChain.back()) | |||
6311 | SubobjectParent = Subobject; | |||
6312 | if (!HandleLValueMember(Info, I->getInit(), Subobject, FD)) | |||
6313 | return false; | |||
6314 | if (CD->isUnion()) | |||
6315 | Value = &Value->getUnionValue(); | |||
6316 | else { | |||
6317 | if (C == IndirectFieldChain.front() && !RD->isUnion()) | |||
6318 | SkipToField(FD, true); | |||
6319 | Value = &Value->getStructField(FD->getFieldIndex()); | |||
6320 | } | |||
6321 | } | |||
6322 | } else { | |||
6323 | llvm_unreachable("unknown base initializer kind")::llvm::llvm_unreachable_internal("unknown base initializer kind" , "clang/lib/AST/ExprConstant.cpp", 6323); | |||
6324 | } | |||
6325 | ||||
6326 | // Need to override This for implicit field initializers as in this case | |||
6327 | // This refers to innermost anonymous struct/union containing initializer, | |||
6328 | // not to currently constructed class. | |||
6329 | const Expr *Init = I->getInit(); | |||
6330 | if (Init->isValueDependent()) { | |||
6331 | if (!EvaluateDependentExpr(Init, Info)) | |||
6332 | return false; | |||
6333 | } else { | |||
6334 | ThisOverrideRAII ThisOverride(*Info.CurrentCall, &SubobjectParent, | |||
6335 | isa<CXXDefaultInitExpr>(Init)); | |||
6336 | FullExpressionRAII InitScope(Info); | |||
6337 | if (!EvaluateInPlace(*Value, Info, Subobject, Init) || | |||
6338 | (FD && FD->isBitField() && | |||
6339 | !truncateBitfieldValue(Info, Init, *Value, FD))) { | |||
6340 | // If we're checking for a potential constant expression, evaluate all | |||
6341 | // initializers even if some of them fail. | |||
6342 | if (!Info.noteFailure()) | |||
6343 | return false; | |||
6344 | Success = false; | |||
6345 | } | |||
6346 | } | |||
6347 | ||||
6348 | // This is the point at which the dynamic type of the object becomes this | |||
6349 | // class type. | |||
6350 | if (I->isBaseInitializer() && BasesSeen == RD->getNumBases()) | |||
6351 | EvalObj.finishedConstructingBases(); | |||
6352 | } | |||
6353 | ||||
6354 | // Default-initialize any remaining fields. | |||
6355 | if (!RD->isUnion()) { | |||
6356 | for (; FieldIt != RD->field_end(); ++FieldIt) { | |||
6357 | if (!FieldIt->isUnnamedBitfield()) | |||
6358 | Success &= getDefaultInitValue( | |||
6359 | FieldIt->getType(), | |||
6360 | Result.getStructField(FieldIt->getFieldIndex())); | |||
6361 | } | |||
6362 | } | |||
6363 | ||||
6364 | EvalObj.finishedConstructingFields(); | |||
6365 | ||||
6366 | return Success && | |||
6367 | EvaluateStmt(Ret, Info, Definition->getBody()) != ESR_Failed && | |||
6368 | LifetimeExtendedScope.destroy(); | |||
6369 | } | |||
6370 | ||||
6371 | static bool HandleConstructorCall(const Expr *E, const LValue &This, | |||
6372 | ArrayRef<const Expr*> Args, | |||
6373 | const CXXConstructorDecl *Definition, | |||
6374 | EvalInfo &Info, APValue &Result) { | |||
6375 | CallScopeRAII CallScope(Info); | |||
6376 | CallRef Call = Info.CurrentCall->createCall(Definition); | |||
6377 | if (!EvaluateArgs(Args, Call, Info, Definition)) | |||
6378 | return false; | |||
6379 | ||||
6380 | return HandleConstructorCall(E, This, Call, Definition, Info, Result) && | |||
6381 | CallScope.destroy(); | |||
6382 | } | |||
6383 | ||||
6384 | static bool HandleDestructionImpl(EvalInfo &Info, SourceLocation CallLoc, | |||
6385 | const LValue &This, APValue &Value, | |||
6386 | QualType T) { | |||
6387 | // Objects can only be destroyed while they're within their lifetimes. | |||
6388 | // FIXME: We have no representation for whether an object of type nullptr_t | |||
6389 | // is in its lifetime; it usually doesn't matter. Perhaps we should model it | |||
6390 | // as indeterminate instead? | |||
6391 | if (Value.isAbsent() && !T->isNullPtrType()) { | |||
6392 | APValue Printable; | |||
6393 | This.moveInto(Printable); | |||
6394 | Info.FFDiag(CallLoc, diag::note_constexpr_destroy_out_of_lifetime) | |||
6395 | << Printable.getAsString(Info.Ctx, Info.Ctx.getLValueReferenceType(T)); | |||
6396 | return false; | |||
6397 | } | |||
6398 | ||||
6399 | // Invent an expression for location purposes. | |||
6400 | // FIXME: We shouldn't need to do this. | |||
6401 | OpaqueValueExpr LocE(CallLoc, Info.Ctx.IntTy, VK_PRValue); | |||
6402 | ||||
6403 | // For arrays, destroy elements right-to-left. | |||
6404 | if (const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(T)) { | |||
6405 | uint64_t Size = CAT->getSize().getZExtValue(); | |||
6406 | QualType ElemT = CAT->getElementType(); | |||
6407 | ||||
6408 | LValue ElemLV = This; | |||
6409 | ElemLV.addArray(Info, &LocE, CAT); | |||
6410 | if (!HandleLValueArrayAdjustment(Info, &LocE, ElemLV, ElemT, Size)) | |||
6411 | return false; | |||
6412 | ||||
6413 | // Ensure that we have actual array elements available to destroy; the | |||
6414 | // destructors might mutate the value, so we can't run them on the array | |||
6415 | // filler. | |||
6416 | if (Size && Size > Value.getArrayInitializedElts()) | |||
6417 | expandArray(Value, Value.getArraySize() - 1); | |||
6418 | ||||
6419 | for (; Size != 0; --Size) { | |||
6420 | APValue &Elem = Value.getArrayInitializedElt(Size - 1); | |||
6421 | if (!HandleLValueArrayAdjustment(Info, &LocE, ElemLV, ElemT, -1) || | |||
6422 | !HandleDestructionImpl(Info, CallLoc, ElemLV, Elem, ElemT)) | |||
6423 | return false; | |||
6424 | } | |||
6425 | ||||
6426 | // End the lifetime of this array now. | |||
6427 | Value = APValue(); | |||
6428 | return true; | |||
6429 | } | |||
6430 | ||||
6431 | const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); | |||
6432 | if (!RD) { | |||
6433 | if (T.isDestructedType()) { | |||
6434 | Info.FFDiag(CallLoc, diag::note_constexpr_unsupported_destruction) << T; | |||
6435 | return false; | |||
6436 | } | |||
6437 | ||||
6438 | Value = APValue(); | |||
6439 | return true; | |||
6440 | } | |||
6441 | ||||
6442 | if (RD->getNumVBases()) { | |||
6443 | Info.FFDiag(CallLoc, diag::note_constexpr_virtual_base) << RD; | |||
6444 | return false; | |||
6445 | } | |||
6446 | ||||
6447 | const CXXDestructorDecl *DD = RD->getDestructor(); | |||
6448 | if (!DD && !RD->hasTrivialDestructor()) { | |||
6449 | Info.FFDiag(CallLoc); | |||
6450 | return false; | |||
6451 | } | |||
6452 | ||||
6453 | if (!DD || DD->isTrivial() || | |||
6454 | (RD->isAnonymousStructOrUnion() && RD->isUnion())) { | |||
6455 | // A trivial destructor just ends the lifetime of the object. Check for | |||
6456 | // this case before checking for a body, because we might not bother | |||
6457 | // building a body for a trivial destructor. Note that it doesn't matter | |||
6458 | // whether the destructor is constexpr in this case; all trivial | |||
6459 | // destructors are constexpr. | |||
6460 | // | |||
6461 | // If an anonymous union would be destroyed, some enclosing destructor must | |||
6462 | // have been explicitly defined, and the anonymous union destruction should | |||
6463 | // have no effect. | |||
6464 | Value = APValue(); | |||
6465 | return true; | |||
6466 | } | |||
6467 | ||||
6468 | if (!Info.CheckCallLimit(CallLoc)) | |||
6469 | return false; | |||
6470 | ||||
6471 | const FunctionDecl *Definition = nullptr; | |||
6472 | const Stmt *Body = DD->getBody(Definition); | |||
6473 | ||||
6474 | if (!CheckConstexprFunction(Info, CallLoc, DD, Definition, Body)) | |||
6475 | return false; | |||
6476 | ||||
6477 | CallStackFrame Frame(Info, CallLoc, Definition, &This, CallRef()); | |||
6478 | ||||
6479 | // We're now in the period of destruction of this object. | |||
6480 | unsigned BasesLeft = RD->getNumBases(); | |||
6481 | EvalInfo::EvaluatingDestructorRAII EvalObj( | |||
6482 | Info, | |||
6483 | ObjectUnderConstruction{This.getLValueBase(), This.Designator.Entries}); | |||
6484 | if (!EvalObj.DidInsert) { | |||
6485 | // C++2a [class.dtor]p19: | |||
6486 | // the behavior is undefined if the destructor is invoked for an object | |||
6487 | // whose lifetime has ended | |||
6488 | // (Note that formally the lifetime ends when the period of destruction | |||
6489 | // begins, even though certain uses of the object remain valid until the | |||
6490 | // period of destruction ends.) | |||
6491 | Info.FFDiag(CallLoc, diag::note_constexpr_double_destroy); | |||
6492 | return false; | |||
6493 | } | |||
6494 | ||||
6495 | // FIXME: Creating an APValue just to hold a nonexistent return value is | |||
6496 | // wasteful. | |||
6497 | APValue RetVal; | |||
6498 | StmtResult Ret = {RetVal, nullptr}; | |||
6499 | if (EvaluateStmt(Ret, Info, Definition->getBody()) == ESR_Failed) | |||
6500 | return false; | |||
6501 | ||||
6502 | // A union destructor does not implicitly destroy its members. | |||
6503 | if (RD->isUnion()) | |||
6504 | return true; | |||
6505 | ||||
6506 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | |||
6507 | ||||
6508 | // We don't have a good way to iterate fields in reverse, so collect all the | |||
6509 | // fields first and then walk them backwards. | |||
6510 | SmallVector<FieldDecl*, 16> Fields(RD->field_begin(), RD->field_end()); | |||
6511 | for (const FieldDecl *FD : llvm::reverse(Fields)) { | |||
6512 | if (FD->isUnnamedBitfield()) | |||
6513 | continue; | |||
6514 | ||||
6515 | LValue Subobject = This; | |||
6516 | if (!HandleLValueMember(Info, &LocE, Subobject, FD, &Layout)) | |||
6517 | return false; | |||
6518 | ||||
6519 | APValue *SubobjectValue = &Value.getStructField(FD->getFieldIndex()); | |||
6520 | if (!HandleDestructionImpl(Info, CallLoc, Subobject, *SubobjectValue, | |||
6521 | FD->getType())) | |||
6522 | return false; | |||
6523 | } | |||
6524 | ||||
6525 | if (BasesLeft != 0) | |||
6526 | EvalObj.startedDestroyingBases(); | |||
6527 | ||||
6528 | // Destroy base classes in reverse order. | |||
6529 | for (const CXXBaseSpecifier &Base : llvm::reverse(RD->bases())) { | |||
6530 | --BasesLeft; | |||
6531 | ||||
6532 | QualType BaseType = Base.getType(); | |||
6533 | LValue Subobject = This; | |||
6534 | if (!HandleLValueDirectBase(Info, &LocE, Subobject, RD, | |||
6535 | BaseType->getAsCXXRecordDecl(), &Layout)) | |||
6536 | return false; | |||
6537 | ||||
6538 | APValue *SubobjectValue = &Value.getStructBase(BasesLeft); | |||
6539 | if (!HandleDestructionImpl(Info, CallLoc, Subobject, *SubobjectValue, | |||
6540 | BaseType)) | |||
6541 | return false; | |||
6542 | } | |||
6543 | assert(BasesLeft == 0 && "NumBases was wrong?")(static_cast <bool> (BasesLeft == 0 && "NumBases was wrong?" ) ? void (0) : __assert_fail ("BasesLeft == 0 && \"NumBases was wrong?\"" , "clang/lib/AST/ExprConstant.cpp", 6543, __extension__ __PRETTY_FUNCTION__ )); | |||
6544 | ||||
6545 | // The period of destruction ends now. The object is gone. | |||
6546 | Value = APValue(); | |||
6547 | return true; | |||
6548 | } | |||
6549 | ||||
6550 | namespace { | |||
6551 | struct DestroyObjectHandler { | |||
6552 | EvalInfo &Info; | |||
6553 | const Expr *E; | |||
6554 | const LValue &This; | |||
6555 | const AccessKinds AccessKind; | |||
6556 | ||||
6557 | typedef bool result_type; | |||
6558 | bool failed() { return false; } | |||
6559 | bool found(APValue &Subobj, QualType SubobjType) { | |||
6560 | return HandleDestructionImpl(Info, E->getExprLoc(), This, Subobj, | |||
6561 | SubobjType); | |||
6562 | } | |||
6563 | bool found(APSInt &Value, QualType SubobjType) { | |||
6564 | Info.FFDiag(E, diag::note_constexpr_destroy_complex_elem); | |||
6565 | return false; | |||
6566 | } | |||
6567 | bool found(APFloat &Value, QualType SubobjType) { | |||
6568 | Info.FFDiag(E, diag::note_constexpr_destroy_complex_elem); | |||
6569 | return false; | |||
6570 | } | |||
6571 | }; | |||
6572 | } | |||
6573 | ||||
6574 | /// Perform a destructor or pseudo-destructor call on the given object, which | |||
6575 | /// might in general not be a complete object. | |||
6576 | static bool HandleDestruction(EvalInfo &Info, const Expr *E, | |||
6577 | const LValue &This, QualType ThisType) { | |||
6578 | CompleteObject Obj = findCompleteObject(Info, E, AK_Destroy, This, ThisType); | |||
6579 | DestroyObjectHandler Handler = {Info, E, This, AK_Destroy}; | |||
6580 | return Obj && findSubobject(Info, E, Obj, This.Designator, Handler); | |||
6581 | } | |||
6582 | ||||
6583 | /// Destroy and end the lifetime of the given complete object. | |||
6584 | static bool HandleDestruction(EvalInfo &Info, SourceLocation Loc, | |||
6585 | APValue::LValueBase LVBase, APValue &Value, | |||
6586 | QualType T) { | |||
6587 | // If we've had an unmodeled side-effect, we can't rely on mutable state | |||
6588 | // (such as the object we're about to destroy) being correct. | |||
6589 | if (Info.EvalStatus.HasSideEffects) | |||
6590 | return false; | |||
6591 | ||||
6592 | LValue LV; | |||
6593 | LV.set({LVBase}); | |||
6594 | return HandleDestructionImpl(Info, Loc, LV, Value, T); | |||
6595 | } | |||
6596 | ||||
6597 | /// Perform a call to 'perator new' or to `__builtin_operator_new'. | |||
6598 | static bool HandleOperatorNewCall(EvalInfo &Info, const CallExpr *E, | |||
6599 | LValue &Result) { | |||
6600 | if (Info.checkingPotentialConstantExpression() || | |||
6601 | Info.SpeculativeEvaluationDepth) | |||
6602 | return false; | |||
6603 | ||||
6604 | // This is permitted only within a call to std::allocator<T>::allocate. | |||
6605 | auto Caller = Info.getStdAllocatorCaller("allocate"); | |||
6606 | if (!Caller) { | |||
6607 | Info.FFDiag(E->getExprLoc(), Info.getLangOpts().CPlusPlus20 | |||
6608 | ? diag::note_constexpr_new_untyped | |||
6609 | : diag::note_constexpr_new); | |||
6610 | return false; | |||
6611 | } | |||
6612 | ||||
6613 | QualType ElemType = Caller.ElemType; | |||
6614 | if (ElemType->isIncompleteType() || ElemType->isFunctionType()) { | |||
6615 | Info.FFDiag(E->getExprLoc(), | |||
6616 | diag::note_constexpr_new_not_complete_object_type) | |||
6617 | << (ElemType->isIncompleteType() ? 0 : 1) << ElemType; | |||
6618 | return false; | |||
6619 | } | |||
6620 | ||||
6621 | APSInt ByteSize; | |||
6622 | if (!EvaluateInteger(E->getArg(0), ByteSize, Info)) | |||
6623 | return false; | |||
6624 | bool IsNothrow = false; | |||
6625 | for (unsigned I = 1, N = E->getNumArgs(); I != N; ++I) { | |||
6626 | EvaluateIgnoredValue(Info, E->getArg(I)); | |||
6627 | IsNothrow |= E->getType()->isNothrowT(); | |||
6628 | } | |||
6629 | ||||
6630 | CharUnits ElemSize; | |||
6631 | if (!HandleSizeof(Info, E->getExprLoc(), ElemType, ElemSize)) | |||
6632 | return false; | |||
6633 | APInt Size, Remainder; | |||
6634 | APInt ElemSizeAP(ByteSize.getBitWidth(), ElemSize.getQuantity()); | |||
6635 | APInt::udivrem(ByteSize, ElemSizeAP, Size, Remainder); | |||
6636 | if (Remainder != 0) { | |||
6637 | // This likely indicates a bug in the implementation of 'std::allocator'. | |||
6638 | Info.FFDiag(E->getExprLoc(), diag::note_constexpr_operator_new_bad_size) | |||
6639 | << ByteSize << APSInt(ElemSizeAP, true) << ElemType; | |||
6640 | return false; | |||
6641 | } | |||
6642 | ||||
6643 | if (ByteSize.getActiveBits() > ConstantArrayType::getMaxSizeBits(Info.Ctx)) { | |||
6644 | if (IsNothrow) { | |||
6645 | Result.setNull(Info.Ctx, E->getType()); | |||
6646 | return true; | |||
6647 | } | |||
6648 | ||||
6649 | Info.FFDiag(E, diag::note_constexpr_new_too_large) << APSInt(Size, true); | |||
6650 | return false; | |||
6651 | } | |||
6652 | ||||
6653 | QualType AllocType = Info.Ctx.getConstantArrayType(ElemType, Size, nullptr, | |||
6654 | ArrayType::Normal, 0); | |||
6655 | APValue *Val = Info.createHeapAlloc(E, AllocType, Result); | |||
6656 | *Val = APValue(APValue::UninitArray(), 0, Size.getZExtValue()); | |||
6657 | Result.addArray(Info, E, cast<ConstantArrayType>(AllocType)); | |||
6658 | return true; | |||
6659 | } | |||
6660 | ||||
6661 | static bool hasVirtualDestructor(QualType T) { | |||
6662 | if (CXXRecordDecl *RD = T->getAsCXXRecordDecl()) | |||
6663 | if (CXXDestructorDecl *DD = RD->getDestructor()) | |||
6664 | return DD->isVirtual(); | |||
6665 | return false; | |||
6666 | } | |||
6667 | ||||
6668 | static const FunctionDecl *getVirtualOperatorDelete(QualType T) { | |||
6669 | if (CXXRecordDecl *RD = T->getAsCXXRecordDecl()) | |||
6670 | if (CXXDestructorDecl *DD = RD->getDestructor()) | |||
6671 | return DD->isVirtual() ? DD->getOperatorDelete() : nullptr; | |||
6672 | return nullptr; | |||
6673 | } | |||
6674 | ||||
6675 | /// Check that the given object is a suitable pointer to a heap allocation that | |||
6676 | /// still exists and is of the right kind for the purpose of a deletion. | |||
6677 | /// | |||
6678 | /// On success, returns the heap allocation to deallocate. On failure, produces | |||
6679 | /// a diagnostic and returns None. | |||
6680 | static Optional<DynAlloc *> CheckDeleteKind(EvalInfo &Info, const Expr *E, | |||
6681 | const LValue &Pointer, | |||
6682 | DynAlloc::Kind DeallocKind) { | |||
6683 | auto PointerAsString = [&] { | |||
6684 | return Pointer.toString(Info.Ctx, Info.Ctx.VoidPtrTy); | |||
6685 | }; | |||
6686 | ||||
6687 | DynamicAllocLValue DA = Pointer.Base.dyn_cast<DynamicAllocLValue>(); | |||
6688 | if (!DA) { | |||
6689 | Info.FFDiag(E, diag::note_constexpr_delete_not_heap_alloc) | |||
6690 | << PointerAsString(); | |||
6691 | if (Pointer.Base) | |||
6692 | NoteLValueLocation(Info, Pointer.Base); | |||
6693 | return None; | |||
6694 | } | |||
6695 | ||||
6696 | Optional<DynAlloc *> Alloc = Info.lookupDynamicAlloc(DA); | |||
6697 | if (!Alloc) { | |||
6698 | Info.FFDiag(E, diag::note_constexpr_double_delete); | |||
6699 | return None; | |||
6700 | } | |||
6701 | ||||
6702 | QualType AllocType = Pointer.Base.getDynamicAllocType(); | |||
6703 | if (DeallocKind != (*Alloc)->getKind()) { | |||
6704 | Info.FFDiag(E, diag::note_constexpr_new_delete_mismatch) | |||
6705 | << DeallocKind << (*Alloc)->getKind() << AllocType; | |||
6706 | NoteLValueLocation(Info, Pointer.Base); | |||
6707 | return None; | |||
6708 | } | |||
6709 | ||||
6710 | bool Subobject = false; | |||
6711 | if (DeallocKind == DynAlloc::New) { | |||
6712 | Subobject = Pointer.Designator.MostDerivedPathLength != 0 || | |||
6713 | Pointer.Designator.isOnePastTheEnd(); | |||
6714 | } else { | |||
6715 | Subobject = Pointer.Designator.Entries.size() != 1 || | |||
6716 | Pointer.Designator.Entries[0].getAsArrayIndex() != 0; | |||
6717 | } | |||
6718 | if (Subobject) { | |||
6719 | Info.FFDiag(E, diag::note_constexpr_delete_subobject) | |||
6720 | << PointerAsString() << Pointer.Designator.isOnePastTheEnd(); | |||
6721 | return None; | |||
6722 | } | |||
6723 | ||||
6724 | return Alloc; | |||
6725 | } | |||
6726 | ||||
6727 | // Perform a call to 'operator delete' or '__builtin_operator_delete'. | |||
6728 | bool HandleOperatorDeleteCall(EvalInfo &Info, const CallExpr *E) { | |||
6729 | if (Info.checkingPotentialConstantExpression() || | |||
6730 | Info.SpeculativeEvaluationDepth) | |||
6731 | return false; | |||
6732 | ||||
6733 | // This is permitted only within a call to std::allocator<T>::deallocate. | |||
6734 | if (!Info.getStdAllocatorCaller("deallocate")) { | |||
6735 | Info.FFDiag(E->getExprLoc()); | |||
6736 | return true; | |||
6737 | } | |||
6738 | ||||
6739 | LValue Pointer; | |||
6740 | if (!EvaluatePointer(E->getArg(0), Pointer, Info)) | |||
6741 | return false; | |||
6742 | for (unsigned I = 1, N = E->getNumArgs(); I != N; ++I) | |||
6743 | EvaluateIgnoredValue(Info, E->getArg(I)); | |||
6744 | ||||
6745 | if (Pointer.Designator.Invalid) | |||
6746 | return false; | |||
6747 | ||||
6748 | // Deleting a null pointer would have no effect, but it's not permitted by | |||
6749 | // std::allocator<T>::deallocate's contract. | |||
6750 | if (Pointer.isNullPointer()) { | |||
6751 | Info.CCEDiag(E->getExprLoc(), diag::note_constexpr_deallocate_null); | |||
6752 | return true; | |||
6753 | } | |||
6754 | ||||
6755 | if (!CheckDeleteKind(Info, E, Pointer, DynAlloc::StdAllocator)) | |||
6756 | return false; | |||
6757 | ||||
6758 | Info.HeapAllocs.erase(Pointer.Base.get<DynamicAllocLValue>()); | |||
6759 | return true; | |||
6760 | } | |||
6761 | ||||
6762 | //===----------------------------------------------------------------------===// | |||
6763 | // Generic Evaluation | |||
6764 | //===----------------------------------------------------------------------===// | |||
6765 | namespace { | |||
6766 | ||||
6767 | class BitCastBuffer { | |||
6768 | // FIXME: We're going to need bit-level granularity when we support | |||
6769 | // bit-fields. | |||
6770 | // FIXME: Its possible under the C++ standard for 'char' to not be 8 bits, but | |||
6771 | // we don't support a host or target where that is the case. Still, we should | |||
6772 | // use a more generic type in case we ever do. | |||
6773 | SmallVector<Optional<unsigned char>, 32> Bytes; | |||
6774 | ||||
6775 | static_assert(std::numeric_limits<unsigned char>::digits >= 8, | |||
6776 | "Need at least 8 bit unsigned char"); | |||
6777 | ||||
6778 | bool TargetIsLittleEndian; | |||
6779 | ||||
6780 | public: | |||
6781 | BitCastBuffer(CharUnits Width, bool TargetIsLittleEndian) | |||
6782 | : Bytes(Width.getQuantity()), | |||
6783 | TargetIsLittleEndian(TargetIsLittleEndian) {} | |||
6784 | ||||
6785 | LLVM_NODISCARD[[clang::warn_unused_result]] | |||
6786 | bool readObject(CharUnits Offset, CharUnits Width, | |||
6787 | SmallVectorImpl<unsigned char> &Output) const { | |||
6788 | for (CharUnits I = Offset, E = Offset + Width; I != E; ++I) { | |||
6789 | // If a byte of an integer is uninitialized, then the whole integer is | |||
6790 | // uninitialized. | |||
6791 | if (!Bytes[I.getQuantity()]) | |||
6792 | return false; | |||
6793 | Output.push_back(*Bytes[I.getQuantity()]); | |||
6794 | } | |||
6795 | if (llvm::sys::IsLittleEndianHost != TargetIsLittleEndian) | |||
6796 | std::reverse(Output.begin(), Output.end()); | |||
6797 | return true; | |||
6798 | } | |||
6799 | ||||
6800 | void writeObject(CharUnits Offset, SmallVectorImpl<unsigned char> &Input) { | |||
6801 | if (llvm::sys::IsLittleEndianHost != TargetIsLittleEndian) | |||
6802 | std::reverse(Input.begin(), Input.end()); | |||
6803 | ||||
6804 | size_t Index = 0; | |||
6805 | for (unsigned char Byte : Input) { | |||
6806 | assert(!Bytes[Offset.getQuantity() + Index] && "overwriting a byte?")(static_cast <bool> (!Bytes[Offset.getQuantity() + Index ] && "overwriting a byte?") ? void (0) : __assert_fail ("!Bytes[Offset.getQuantity() + Index] && \"overwriting a byte?\"" , "clang/lib/AST/ExprConstant.cpp", 6806, __extension__ __PRETTY_FUNCTION__ )); | |||
6807 | Bytes[Offset.getQuantity() + Index] = Byte; | |||
6808 | ++Index; | |||
6809 | } | |||
6810 | } | |||
6811 | ||||
6812 | size_t size() { return Bytes.size(); } | |||
6813 | }; | |||
6814 | ||||
6815 | /// Traverse an APValue to produce an BitCastBuffer, emulating how the current | |||
6816 | /// target would represent the value at runtime. | |||
6817 | class APValueToBufferConverter { | |||
6818 | EvalInfo &Info; | |||
6819 | BitCastBuffer Buffer; | |||
6820 | const CastExpr *BCE; | |||
6821 | ||||
6822 | APValueToBufferConverter(EvalInfo &Info, CharUnits ObjectWidth, | |||
6823 | const CastExpr *BCE) | |||
6824 | : Info(Info), | |||
6825 | Buffer(ObjectWidth, Info.Ctx.getTargetInfo().isLittleEndian()), | |||
6826 | BCE(BCE) {} | |||
6827 | ||||
6828 | bool visit(const APValue &Val, QualType Ty) { | |||
6829 | return visit(Val, Ty, CharUnits::fromQuantity(0)); | |||
6830 | } | |||
6831 | ||||
6832 | // Write out Val with type Ty into Buffer starting at Offset. | |||
6833 | bool visit(const APValue &Val, QualType Ty, CharUnits Offset) { | |||
6834 | assert((size_t)Offset.getQuantity() <= Buffer.size())(static_cast <bool> ((size_t)Offset.getQuantity() <= Buffer.size()) ? void (0) : __assert_fail ("(size_t)Offset.getQuantity() <= Buffer.size()" , "clang/lib/AST/ExprConstant.cpp", 6834, __extension__ __PRETTY_FUNCTION__ )); | |||
6835 | ||||
6836 | // As a special case, nullptr_t has an indeterminate value. | |||
6837 | if (Ty->isNullPtrType()) | |||
6838 | return true; | |||
6839 | ||||
6840 | // Dig through Src to find the byte at SrcOffset. | |||
6841 | switch (Val.getKind()) { | |||
6842 | case APValue::Indeterminate: | |||
6843 | case APValue::None: | |||
6844 | return true; | |||
6845 | ||||
6846 | case APValue::Int: | |||
6847 | return visitInt(Val.getInt(), Ty, Offset); | |||
6848 | case APValue::Float: | |||
6849 | return visitFloat(Val.getFloat(), Ty, Offset); | |||
6850 | case APValue::Array: | |||
6851 | return visitArray(Val, Ty, Offset); | |||
6852 | case APValue::Struct: | |||
6853 | return visitRecord(Val, Ty, Offset); | |||
6854 | ||||
6855 | case APValue::ComplexInt: | |||
6856 | case APValue::ComplexFloat: | |||
6857 | case APValue::Vector: | |||
6858 | case APValue::FixedPoint: | |||
6859 | // FIXME: We should support these. | |||
6860 | ||||
6861 | case APValue::Union: | |||
6862 | case APValue::MemberPointer: | |||
6863 | case APValue::AddrLabelDiff: { | |||
6864 | Info.FFDiag(BCE->getBeginLoc(), | |||
6865 | diag::note_constexpr_bit_cast_unsupported_type) | |||
6866 | << Ty; | |||
6867 | return false; | |||
6868 | } | |||
6869 | ||||
6870 | case APValue::LValue: | |||
6871 | llvm_unreachable("LValue subobject in bit_cast?")::llvm::llvm_unreachable_internal("LValue subobject in bit_cast?" , "clang/lib/AST/ExprConstant.cpp", 6871); | |||
6872 | } | |||
6873 | llvm_unreachable("Unhandled APValue::ValueKind")::llvm::llvm_unreachable_internal("Unhandled APValue::ValueKind" , "clang/lib/AST/ExprConstant.cpp", 6873); | |||
6874 | } | |||
6875 | ||||
6876 | bool visitRecord(const APValue &Val, QualType Ty, CharUnits Offset) { | |||
6877 | const RecordDecl *RD = Ty->getAsRecordDecl(); | |||
6878 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | |||
6879 | ||||
6880 | // Visit the base classes. | |||
6881 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) { | |||
6882 | for (size_t I = 0, E = CXXRD->getNumBases(); I != E; ++I) { | |||
6883 | const CXXBaseSpecifier &BS = CXXRD->bases_begin()[I]; | |||
6884 | CXXRecordDecl *BaseDecl = BS.getType()->getAsCXXRecordDecl(); | |||
6885 | ||||
6886 | if (!visitRecord(Val.getStructBase(I), BS.getType(), | |||
6887 | Layout.getBaseClassOffset(BaseDecl) + Offset)) | |||
6888 | return false; | |||
6889 | } | |||
6890 | } | |||
6891 | ||||
6892 | // Visit the fields. | |||
6893 | unsigned FieldIdx = 0; | |||
6894 | for (FieldDecl *FD : RD->fields()) { | |||
6895 | if (FD->isBitField()) { | |||
6896 | Info.FFDiag(BCE->getBeginLoc(), | |||
6897 | diag::note_constexpr_bit_cast_unsupported_bitfield); | |||
6898 | return false; | |||
6899 | } | |||
6900 | ||||
6901 | uint64_t FieldOffsetBits = Layout.getFieldOffset(FieldIdx); | |||
6902 | ||||
6903 | assert(FieldOffsetBits % Info.Ctx.getCharWidth() == 0 &&(static_cast <bool> (FieldOffsetBits % Info.Ctx.getCharWidth () == 0 && "only bit-fields can have sub-char alignment" ) ? void (0) : __assert_fail ("FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && \"only bit-fields can have sub-char alignment\"" , "clang/lib/AST/ExprConstant.cpp", 6904, __extension__ __PRETTY_FUNCTION__ )) | |||
6904 | "only bit-fields can have sub-char alignment")(static_cast <bool> (FieldOffsetBits % Info.Ctx.getCharWidth () == 0 && "only bit-fields can have sub-char alignment" ) ? void (0) : __assert_fail ("FieldOffsetBits % Info.Ctx.getCharWidth() == 0 && \"only bit-fields can have sub-char alignment\"" , "clang/lib/AST/ExprConstant.cpp", 6904, __extension__ __PRETTY_FUNCTION__ )); | |||
6905 | CharUnits FieldOffset = | |||
6906 | Info.Ctx.toCharUnitsFromBits(FieldOffsetBits) + Offset; | |||
6907 | QualType FieldTy = FD->getType(); | |||
6908 | if (!visit(Val.getStructField(FieldIdx), FieldTy, FieldOffset)) | |||
6909 | return false; | |||
6910 | ++FieldIdx; | |||
6911 | } | |||
6912 | ||||
6913 | return true; | |||
6914 | } | |||
6915 | ||||
6916 | bool visitArray(const APValue &Val, QualType Ty, CharUnits Offset) { | |||
6917 | const auto *CAT = | |||
6918 | dyn_cast_or_null<ConstantArrayType>(Ty->getAsArrayTypeUnsafe()); | |||
6919 | if (!CAT) | |||
6920 | return false; | |||
6921 | ||||
6922 | CharUnits ElemWidth = Info.Ctx.getTypeSizeInChars(CAT->getElementType()); | |||
6923 | unsigned NumInitializedElts = Val.getArrayInitializedElts(); | |||
6924 | unsigned ArraySize = Val.getArraySize(); | |||
6925 | // First, initialize the initialized elements. | |||
6926 | for (unsigned I = 0; I != NumInitializedElts; ++I) { | |||
6927 | const APValue &SubObj = Val.getArrayInitializedElt(I); | |||
6928 | if (!visit(SubObj, CAT->getElementType(), Offset + I * ElemWidth)) | |||
6929 | return false; | |||
6930 | } | |||
6931 | ||||
6932 | // Next, initialize the rest of the array using the filler. | |||
6933 | if (Val.hasArrayFiller()) { | |||
6934 | const APValue &Filler = Val.getArrayFiller(); | |||
6935 | for (unsigned I = NumInitializedElts; I != ArraySize; ++I) { | |||
6936 | if (!visit(Filler, CAT->getElementType(), Offset + I * ElemWidth)) | |||
6937 | return false; | |||
6938 | } | |||
6939 | } | |||
6940 | ||||
6941 | return true; | |||
6942 | } | |||
6943 | ||||
6944 | bool visitInt(const APSInt &Val, QualType Ty, CharUnits Offset) { | |||
6945 | APSInt AdjustedVal = Val; | |||
6946 | unsigned Width = AdjustedVal.getBitWidth(); | |||
6947 | if (Ty->isBooleanType()) { | |||
6948 | Width = Info.Ctx.getTypeSize(Ty); | |||
6949 | AdjustedVal = AdjustedVal.extend(Width); | |||
6950 | } | |||
6951 | ||||
6952 | SmallVector<unsigned char, 8> Bytes(Width / 8); | |||
6953 | llvm::StoreIntToMemory(AdjustedVal, &*Bytes.begin(), Width / 8); | |||
6954 | Buffer.writeObject(Offset, Bytes); | |||
6955 | return true; | |||
6956 | } | |||
6957 | ||||
6958 | bool visitFloat(const APFloat &Val, QualType Ty, CharUnits Offset) { | |||
6959 | APSInt AsInt(Val.bitcastToAPInt()); | |||
6960 | return visitInt(AsInt, Ty, Offset); | |||
6961 | } | |||
6962 | ||||
6963 | public: | |||
6964 | static Optional<BitCastBuffer> convert(EvalInfo &Info, const APValue &Src, | |||
6965 | const CastExpr *BCE) { | |||
6966 | CharUnits DstSize = Info.Ctx.getTypeSizeInChars(BCE->getType()); | |||
6967 | APValueToBufferConverter Converter(Info, DstSize, BCE); | |||
6968 | if (!Converter.visit(Src, BCE->getSubExpr()->getType())) | |||
6969 | return None; | |||
6970 | return Converter.Buffer; | |||
6971 | } | |||
6972 | }; | |||
6973 | ||||
6974 | /// Write an BitCastBuffer into an APValue. | |||
6975 | class BufferToAPValueConverter { | |||
6976 | EvalInfo &Info; | |||
6977 | const BitCastBuffer &Buffer; | |||
6978 | const CastExpr *BCE; | |||
6979 | ||||
6980 | BufferToAPValueConverter(EvalInfo &Info, const BitCastBuffer &Buffer, | |||
6981 | const CastExpr *BCE) | |||
6982 | : Info(Info), Buffer(Buffer), BCE(BCE) {} | |||
6983 | ||||
6984 | // Emit an unsupported bit_cast type error. Sema refuses to build a bit_cast | |||
6985 | // with an invalid type, so anything left is a deficiency on our part (FIXME). | |||
6986 | // Ideally this will be unreachable. | |||
6987 | llvm::NoneType unsupportedType(QualType Ty) { | |||
6988 | Info.FFDiag(BCE->getBeginLoc(), | |||
6989 | diag::note_constexpr_bit_cast_unsupported_type) | |||
6990 | << Ty; | |||
6991 | return None; | |||
6992 | } | |||
6993 | ||||
6994 | llvm::NoneType unrepresentableValue(QualType Ty, const APSInt &Val) { | |||
6995 | Info.FFDiag(BCE->getBeginLoc(), | |||
6996 | diag::note_constexpr_bit_cast_unrepresentable_value) | |||
6997 | << Ty << toString(Val, /*Radix=*/10); | |||
6998 | return None; | |||
6999 | } | |||
7000 | ||||
7001 | Optional<APValue> visit(const BuiltinType *T, CharUnits Offset, | |||
7002 | const EnumType *EnumSugar = nullptr) { | |||
7003 | if (T->isNullPtrType()) { | |||
7004 | uint64_t NullValue = Info.Ctx.getTargetNullPointerValue(QualType(T, 0)); | |||
7005 | return APValue((Expr *)nullptr, | |||
7006 | /*Offset=*/CharUnits::fromQuantity(NullValue), | |||
7007 | APValue::NoLValuePath{}, /*IsNullPtr=*/true); | |||
7008 | } | |||
7009 | ||||
7010 | CharUnits SizeOf = Info.Ctx.getTypeSizeInChars(T); | |||
7011 | ||||
7012 | // Work around floating point types that contain unused padding bytes. This | |||
7013 | // is really just `long double` on x86, which is the only fundamental type | |||
7014 | // with padding bytes. | |||
7015 | if (T->isRealFloatingType()) { | |||
7016 | const llvm::fltSemantics &Semantics = | |||
7017 | Info.Ctx.getFloatTypeSemantics(QualType(T, 0)); | |||
7018 | unsigned NumBits = llvm::APFloatBase::getSizeInBits(Semantics); | |||
7019 | assert(NumBits % 8 == 0)(static_cast <bool> (NumBits % 8 == 0) ? void (0) : __assert_fail ("NumBits % 8 == 0", "clang/lib/AST/ExprConstant.cpp", 7019, __extension__ __PRETTY_FUNCTION__)); | |||
7020 | CharUnits NumBytes = CharUnits::fromQuantity(NumBits / 8); | |||
7021 | if (NumBytes != SizeOf) | |||
7022 | SizeOf = NumBytes; | |||
7023 | } | |||
7024 | ||||
7025 | SmallVector<uint8_t, 8> Bytes; | |||
7026 | if (!Buffer.readObject(Offset, SizeOf, Bytes)) { | |||
7027 | // If this is std::byte or unsigned char, then its okay to store an | |||
7028 | // indeterminate value. | |||
7029 | bool IsStdByte = EnumSugar && EnumSugar->isStdByteType(); | |||
7030 | bool IsUChar = | |||
7031 | !EnumSugar && (T->isSpecificBuiltinType(BuiltinType::UChar) || | |||
7032 | T->isSpecificBuiltinType(BuiltinType::Char_U)); | |||
7033 | if (!IsStdByte && !IsUChar) { | |||
7034 | QualType DisplayType(EnumSugar ? (const Type *)EnumSugar : T, 0); | |||
7035 | Info.FFDiag(BCE->getExprLoc(), | |||
7036 | diag::note_constexpr_bit_cast_indet_dest) | |||
7037 | << DisplayType << Info.Ctx.getLangOpts().CharIsSigned; | |||
7038 | return None; | |||
7039 | } | |||
7040 | ||||
7041 | return APValue::IndeterminateValue(); | |||
7042 | } | |||
7043 | ||||
7044 | APSInt Val(SizeOf.getQuantity() * Info.Ctx.getCharWidth(), true); | |||
7045 | llvm::LoadIntFromMemory(Val, &*Bytes.begin(), Bytes.size()); | |||
7046 | ||||
7047 | if (T->isIntegralOrEnumerationType()) { | |||
7048 | Val.setIsSigned(T->isSignedIntegerOrEnumerationType()); | |||
7049 | ||||
7050 | unsigned IntWidth = Info.Ctx.getIntWidth(QualType(T, 0)); | |||
7051 | if (IntWidth != Val.getBitWidth()) { | |||
7052 | APSInt Truncated = Val.trunc(IntWidth); | |||
7053 | if (Truncated.extend(Val.getBitWidth()) != Val) | |||
7054 | return unrepresentableValue(QualType(T, 0), Val); | |||
7055 | Val = Truncated; | |||
7056 | } | |||
7057 | ||||
7058 | return APValue(Val); | |||
7059 | } | |||
7060 | ||||
7061 | if (T->isRealFloatingType()) { | |||
7062 | const llvm::fltSemantics &Semantics = | |||
7063 | Info.Ctx.getFloatTypeSemantics(QualType(T, 0)); | |||
7064 | return APValue(APFloat(Semantics, Val)); | |||
7065 | } | |||
7066 | ||||
7067 | return unsupportedType(QualType(T, 0)); | |||
7068 | } | |||
7069 | ||||
7070 | Optional<APValue> visit(const RecordType *RTy, CharUnits Offset) { | |||
7071 | const RecordDecl *RD = RTy->getAsRecordDecl(); | |||
7072 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | |||
7073 | ||||
7074 | unsigned NumBases = 0; | |||
7075 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) | |||
7076 | NumBases = CXXRD->getNumBases(); | |||
7077 | ||||
7078 | APValue ResultVal(APValue::UninitStruct(), NumBases, | |||
7079 | std::distance(RD->field_begin(), RD->field_end())); | |||
7080 | ||||
7081 | // Visit the base classes. | |||
7082 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) { | |||
7083 | for (size_t I = 0, E = CXXRD->getNumBases(); I != E; ++I) { | |||
7084 | const CXXBaseSpecifier &BS = CXXRD->bases_begin()[I]; | |||
7085 | CXXRecordDecl *BaseDecl = BS.getType()->getAsCXXRecordDecl(); | |||
7086 | if (BaseDecl->isEmpty() || | |||
7087 | Info.Ctx.getASTRecordLayout(BaseDecl).getNonVirtualSize().isZero()) | |||
7088 | continue; | |||
7089 | ||||
7090 | Optional<APValue> SubObj = visitType( | |||
7091 | BS.getType(), Layout.getBaseClassOffset(BaseDecl) + Offset); | |||
7092 | if (!SubObj) | |||
7093 | return None; | |||
7094 | ResultVal.getStructBase(I) = *SubObj; | |||
7095 | } | |||
7096 | } | |||
7097 | ||||
7098 | // Visit the fields. | |||
7099 | unsigned FieldIdx = 0; | |||
7100 | for (FieldDecl *FD : RD->fields()) { | |||
7101 | // FIXME: We don't currently support bit-fields. A lot of the logic for | |||
7102 | // this is in CodeGen, so we need to factor it around. | |||
7103 | if (FD->isBitField()) { | |||
7104 | Info.FFDiag(BCE->getBeginLoc(), | |||
7105 | diag::note_constexpr_bit_cast_unsupported_bitfield); | |||
7106 | return None; | |||
7107 | } | |||
7108 | ||||
7109 | uint64_t FieldOffsetBits = Layout.getFieldOffset(FieldIdx); | |||
7110 | assert(FieldOffsetBits % Info.Ctx.getCharWidth() == 0)(static_cast <bool> (FieldOffsetBits % Info.Ctx.getCharWidth () == 0) ? void (0) : __assert_fail ("FieldOffsetBits % Info.Ctx.getCharWidth() == 0" , "clang/lib/AST/ExprConstant.cpp", 7110, __extension__ __PRETTY_FUNCTION__ )); | |||
7111 | ||||
7112 | CharUnits FieldOffset = | |||
7113 | CharUnits::fromQuantity(FieldOffsetBits / Info.Ctx.getCharWidth()) + | |||
7114 | Offset; | |||
7115 | QualType FieldTy = FD->getType(); | |||
7116 | Optional<APValue> SubObj = visitType(FieldTy, FieldOffset); | |||
7117 | if (!SubObj) | |||
7118 | return None; | |||
7119 | ResultVal.getStructField(FieldIdx) = *SubObj; | |||
7120 | ++FieldIdx; | |||
7121 | } | |||
7122 | ||||
7123 | return ResultVal; | |||
7124 | } | |||
7125 | ||||
7126 | Optional<APValue> visit(const EnumType *Ty, CharUnits Offset) { | |||
7127 | QualType RepresentationType = Ty->getDecl()->getIntegerType(); | |||
7128 | assert(!RepresentationType.isNull() &&(static_cast <bool> (!RepresentationType.isNull() && "enum forward decl should be caught by Sema") ? void (0) : __assert_fail ("!RepresentationType.isNull() && \"enum forward decl should be caught by Sema\"" , "clang/lib/AST/ExprConstant.cpp", 7129, __extension__ __PRETTY_FUNCTION__ )) | |||
7129 | "enum forward decl should be caught by Sema")(static_cast <bool> (!RepresentationType.isNull() && "enum forward decl should be caught by Sema") ? void (0) : __assert_fail ("!RepresentationType.isNull() && \"enum forward decl should be caught by Sema\"" , "clang/lib/AST/ExprConstant.cpp", 7129, __extension__ __PRETTY_FUNCTION__ )); | |||
7130 | const auto *AsBuiltin = | |||
7131 | RepresentationType.getCanonicalType()->castAs<BuiltinType>(); | |||
7132 | // Recurse into the underlying type. Treat std::byte transparently as | |||
7133 | // unsigned char. | |||
7134 | return visit(AsBuiltin, Offset, /*EnumTy=*/Ty); | |||
7135 | } | |||
7136 | ||||
7137 | Optional<APValue> visit(const ConstantArrayType *Ty, CharUnits Offset) { | |||
7138 | size_t Size = Ty->getSize().getLimitedValue(); | |||
7139 | CharUnits ElementWidth = Info.Ctx.getTypeSizeInChars(Ty->getElementType()); | |||
7140 | ||||
7141 | APValue ArrayValue(APValue::UninitArray(), Size, Size); | |||
7142 | for (size_t I = 0; I != Size; ++I) { | |||
7143 | Optional<APValue> ElementValue = | |||
7144 | visitType(Ty->getElementType(), Offset + I * ElementWidth); | |||
7145 | if (!ElementValue) | |||
7146 | return None; | |||
7147 | ArrayValue.getArrayInitializedElt(I) = std::move(*ElementValue); | |||
7148 | } | |||
7149 | ||||
7150 | return ArrayValue; | |||
7151 | } | |||
7152 | ||||
7153 | Optional<APValue> visit(const Type *Ty, CharUnits Offset) { | |||
7154 | return unsupportedType(QualType(Ty, 0)); | |||
7155 | } | |||
7156 | ||||
7157 | Optional<APValue> visitType(QualType Ty, CharUnits Offset) { | |||
7158 | QualType Can = Ty.getCanonicalType(); | |||
7159 | ||||
7160 | switch (Can->getTypeClass()) { | |||
7161 | #define TYPE(Class, Base) \ | |||
7162 | case Type::Class: \ | |||
7163 | return visit(cast<Class##Type>(Can.getTypePtr()), Offset); | |||
7164 | #define ABSTRACT_TYPE(Class, Base) | |||
7165 | #define NON_CANONICAL_TYPE(Class, Base) \ | |||
7166 | case Type::Class: \ | |||
7167 | llvm_unreachable("non-canonical type should be impossible!")::llvm::llvm_unreachable_internal("non-canonical type should be impossible!" , "clang/lib/AST/ExprConstant.cpp", 7167); | |||
7168 | #define DEPENDENT_TYPE(Class, Base) \ | |||
7169 | case Type::Class: \ | |||
7170 | llvm_unreachable( \::llvm::llvm_unreachable_internal("dependent types aren't supported in the constant evaluator!" , "clang/lib/AST/ExprConstant.cpp", 7171) | |||
7171 | "dependent types aren't supported in the constant evaluator!")::llvm::llvm_unreachable_internal("dependent types aren't supported in the constant evaluator!" , "clang/lib/AST/ExprConstant.cpp", 7171); | |||
7172 | #define NON_CANONICAL_UNLESS_DEPENDENT(Class, Base)case Type::Class: ::llvm::llvm_unreachable_internal("either dependent or not canonical!" , "clang/lib/AST/ExprConstant.cpp", 7172); \ | |||
7173 | case Type::Class: \ | |||
7174 | llvm_unreachable("either dependent or not canonical!")::llvm::llvm_unreachable_internal("either dependent or not canonical!" , "clang/lib/AST/ExprConstant.cpp", 7174); | |||
7175 | #include "clang/AST/TypeNodes.inc" | |||
7176 | } | |||
7177 | llvm_unreachable("Unhandled Type::TypeClass")::llvm::llvm_unreachable_internal("Unhandled Type::TypeClass" , "clang/lib/AST/ExprConstant.cpp", 7177); | |||
7178 | } | |||
7179 | ||||
7180 | public: | |||
7181 | // Pull out a full value of type DstType. | |||
7182 | static Optional<APValue> convert(EvalInfo &Info, BitCastBuffer &Buffer, | |||
7183 | const CastExpr *BCE) { | |||
7184 | BufferToAPValueConverter Converter(Info, Buffer, BCE); | |||
7185 | return Converter.visitType(BCE->getType(), CharUnits::fromQuantity(0)); | |||
7186 | } | |||
7187 | }; | |||
7188 | ||||
7189 | static bool checkBitCastConstexprEligibilityType(SourceLocation Loc, | |||
7190 | QualType Ty, EvalInfo *Info, | |||
7191 | const ASTContext &Ctx, | |||
7192 | bool CheckingDest) { | |||
7193 | Ty = Ty.getCanonicalType(); | |||
7194 | ||||
7195 | auto diag = [&](int Reason) { | |||
7196 | if (Info) | |||
7197 | Info->FFDiag(Loc, diag::note_constexpr_bit_cast_invalid_type) | |||
7198 | << CheckingDest << (Reason == 4) << Reason; | |||
7199 | return false; | |||
7200 | }; | |||
7201 | auto note = [&](int Construct, QualType NoteTy, SourceLocation NoteLoc) { | |||
7202 | if (Info) | |||
7203 | Info->Note(NoteLoc, diag::note_constexpr_bit_cast_invalid_subtype) | |||
7204 | << NoteTy << Construct << Ty; | |||
7205 | return false; | |||
7206 | }; | |||
7207 | ||||
7208 | if (Ty->isUnionType()) | |||
7209 | return diag(0); | |||
7210 | if (Ty->isPointerType()) | |||
7211 | return diag(1); | |||
7212 | if (Ty->isMemberPointerType()) | |||
7213 | return diag(2); | |||
7214 | if (Ty.isVolatileQualified()) | |||
7215 | return diag(3); | |||
7216 | ||||
7217 | if (RecordDecl *Record = Ty->getAsRecordDecl()) { | |||
7218 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(Record)) { | |||
7219 | for (CXXBaseSpecifier &BS : CXXRD->bases()) | |||
7220 | if (!checkBitCastConstexprEligibilityType(Loc, BS.getType(), Info, Ctx, | |||
7221 | CheckingDest)) | |||
7222 | return note(1, BS.getType(), BS.getBeginLoc()); | |||
7223 | } | |||
7224 | for (FieldDecl *FD : Record->fields()) { | |||
7225 | if (FD->getType()->isReferenceType()) | |||
7226 | return diag(4); | |||
7227 | if (!checkBitCastConstexprEligibilityType(Loc, FD->getType(), Info, Ctx, | |||
7228 | CheckingDest)) | |||
7229 | return note(0, FD->getType(), FD->getBeginLoc()); | |||
7230 | } | |||
7231 | } | |||
7232 | ||||
7233 | if (Ty->isArrayType() && | |||
7234 | !checkBitCastConstexprEligibilityType(Loc, Ctx.getBaseElementType(Ty), | |||
7235 | Info, Ctx, CheckingDest)) | |||
7236 | return false; | |||
7237 | ||||
7238 | return true; | |||
7239 | } | |||
7240 | ||||
7241 | static bool checkBitCastConstexprEligibility(EvalInfo *Info, | |||
7242 | const ASTContext &Ctx, | |||
7243 | const CastExpr *BCE) { | |||
7244 | bool DestOK = checkBitCastConstexprEligibilityType( | |||
7245 | BCE->getBeginLoc(), BCE->getType(), Info, Ctx, true); | |||
7246 | bool SourceOK = DestOK && checkBitCastConstexprEligibilityType( | |||
7247 | BCE->getBeginLoc(), | |||
7248 | BCE->getSubExpr()->getType(), Info, Ctx, false); | |||
7249 | return SourceOK; | |||
7250 | } | |||
7251 | ||||
7252 | static bool handleLValueToRValueBitCast(EvalInfo &Info, APValue &DestValue, | |||
7253 | APValue &SourceValue, | |||
7254 | const CastExpr *BCE) { | |||
7255 | assert(CHAR_BIT == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 &&(static_cast <bool> (8 == 8 && Info.Ctx.getTargetInfo ().getCharWidth() == 8 && "no host or target supports non 8-bit chars" ) ? void (0) : __assert_fail ("CHAR_BIT == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 && \"no host or target supports non 8-bit chars\"" , "clang/lib/AST/ExprConstant.cpp", 7256, __extension__ __PRETTY_FUNCTION__ )) | |||
7256 | "no host or target supports non 8-bit chars")(static_cast <bool> (8 == 8 && Info.Ctx.getTargetInfo ().getCharWidth() == 8 && "no host or target supports non 8-bit chars" ) ? void (0) : __assert_fail ("CHAR_BIT == 8 && Info.Ctx.getTargetInfo().getCharWidth() == 8 && \"no host or target supports non 8-bit chars\"" , "clang/lib/AST/ExprConstant.cpp", 7256, __extension__ __PRETTY_FUNCTION__ )); | |||
7257 | assert(SourceValue.isLValue() &&(static_cast <bool> (SourceValue.isLValue() && "LValueToRValueBitcast requires an lvalue operand!" ) ? void (0) : __assert_fail ("SourceValue.isLValue() && \"LValueToRValueBitcast requires an lvalue operand!\"" , "clang/lib/AST/ExprConstant.cpp", 7258, __extension__ __PRETTY_FUNCTION__ )) | |||
7258 | "LValueToRValueBitcast requires an lvalue operand!")(static_cast <bool> (SourceValue.isLValue() && "LValueToRValueBitcast requires an lvalue operand!" ) ? void (0) : __assert_fail ("SourceValue.isLValue() && \"LValueToRValueBitcast requires an lvalue operand!\"" , "clang/lib/AST/ExprConstant.cpp", 7258, __extension__ __PRETTY_FUNCTION__ )); | |||
7259 | ||||
7260 | if (!checkBitCastConstexprEligibility(&Info, Info.Ctx, BCE)) | |||
7261 | return false; | |||
7262 | ||||
7263 | LValue SourceLValue; | |||
7264 | APValue SourceRValue; | |||
7265 | SourceLValue.setFrom(Info.Ctx, SourceValue); | |||
7266 | if (!handleLValueToRValueConversion( | |||
7267 | Info, BCE, BCE->getSubExpr()->getType().withConst(), SourceLValue, | |||
7268 | SourceRValue, /*WantObjectRepresentation=*/true)) | |||
7269 | return false; | |||
7270 | ||||
7271 | // Read out SourceValue into a char buffer. | |||
7272 | Optional<BitCastBuffer> Buffer = | |||
7273 | APValueToBufferConverter::convert(Info, SourceRValue, BCE); | |||
7274 | if (!Buffer) | |||
7275 | return false; | |||
7276 | ||||
7277 | // Write out the buffer into a new APValue. | |||
7278 | Optional<APValue> MaybeDestValue = | |||
7279 | BufferToAPValueConverter::convert(Info, *Buffer, BCE); | |||
7280 | if (!MaybeDestValue) | |||
7281 | return false; | |||
7282 | ||||
7283 | DestValue = std::move(*MaybeDestValue); | |||
7284 | return true; | |||
7285 | } | |||
7286 | ||||
7287 | template <class Derived> | |||
7288 | class ExprEvaluatorBase | |||
7289 | : public ConstStmtVisitor<Derived, bool> { | |||
7290 | private: | |||
7291 | Derived &getDerived() { return static_cast<Derived&>(*this); } | |||
7292 | bool DerivedSuccess(const APValue &V, const Expr *E) { | |||
7293 | return getDerived().Success(V, E); | |||
7294 | } | |||
7295 | bool DerivedZeroInitialization(const Expr *E) { | |||
7296 | return getDerived().ZeroInitialization(E); | |||
7297 | } | |||
7298 | ||||
7299 | // Check whether a conditional operator with a non-constant condition is a | |||
7300 | // potential constant expression. If neither arm is a potential constant | |||
7301 | // expression, then the conditional operator is not either. | |||
7302 | template<typename ConditionalOperator> | |||
7303 | void CheckPotentialConstantConditional(const ConditionalOperator *E) { | |||
7304 | assert(Info.checkingPotentialConstantExpression())(static_cast <bool> (Info.checkingPotentialConstantExpression ()) ? void (0) : __assert_fail ("Info.checkingPotentialConstantExpression()" , "clang/lib/AST/ExprConstant.cpp", 7304, __extension__ __PRETTY_FUNCTION__ )); | |||
7305 | ||||
7306 | // Speculatively evaluate both arms. | |||
7307 | SmallVector<PartialDiagnosticAt, 8> Diag; | |||
7308 | { | |||
7309 | SpeculativeEvaluationRAII Speculate(Info, &Diag); | |||
7310 | StmtVisitorTy::Visit(E->getFalseExpr()); | |||
7311 | if (Diag.empty()) | |||
7312 | return; | |||
7313 | } | |||
7314 | ||||
7315 | { | |||
7316 | SpeculativeEvaluationRAII Speculate(Info, &Diag); | |||
7317 | Diag.clear(); | |||
7318 | StmtVisitorTy::Visit(E->getTrueExpr()); | |||
7319 | if (Diag.empty()) | |||
7320 | return; | |||
7321 | } | |||
7322 | ||||
7323 | Error(E, diag::note_constexpr_conditional_never_const); | |||
7324 | } | |||
7325 | ||||
7326 | ||||
7327 | template<typename ConditionalOperator> | |||
7328 | bool HandleConditionalOperator(const ConditionalOperator *E) { | |||
7329 | bool BoolResult; | |||
7330 | if (!EvaluateAsBooleanCondition(E->getCond(), BoolResult, Info)) { | |||
7331 | if (Info.checkingPotentialConstantExpression() && Info.noteFailure()) { | |||
7332 | CheckPotentialConstantConditional(E); | |||
7333 | return false; | |||
7334 | } | |||
7335 | if (Info.noteFailure()) { | |||
7336 | StmtVisitorTy::Visit(E->getTrueExpr()); | |||
7337 | StmtVisitorTy::Visit(E->getFalseExpr()); | |||
7338 | } | |||
7339 | return false; | |||
7340 | } | |||
7341 | ||||
7342 | Expr *EvalExpr = BoolResult ? E->getTrueExpr() : E->getFalseExpr(); | |||
7343 | return StmtVisitorTy::Visit(EvalExpr); | |||
7344 | } | |||
7345 | ||||
7346 | protected: | |||
7347 | EvalInfo &Info; | |||
7348 | typedef ConstStmtVisitor<Derived, bool> StmtVisitorTy; | |||
7349 | typedef ExprEvaluatorBase ExprEvaluatorBaseTy; | |||
7350 | ||||
7351 | OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { | |||
7352 | return Info.CCEDiag(E, D); | |||
7353 | } | |||
7354 | ||||
7355 | bool ZeroInitialization(const Expr *E) { return Error(E); } | |||
7356 | ||||
7357 | public: | |||
7358 | ExprEvaluatorBase(EvalInfo &Info) : Info(Info) {} | |||
7359 | ||||
7360 | EvalInfo &getEvalInfo() { return Info; } | |||
7361 | ||||
7362 | /// Report an evaluation error. This should only be called when an error is | |||
7363 | /// first discovered. When propagating an error, just return false. | |||
7364 | bool Error(const Expr *E, diag::kind D) { | |||
7365 | Info.FFDiag(E, D); | |||
7366 | return false; | |||
7367 | } | |||
7368 | bool Error(const Expr *E) { | |||
7369 | return Error(E, diag::note_invalid_subexpr_in_const_expr); | |||
7370 | } | |||
7371 | ||||
7372 | bool VisitStmt(const Stmt *) { | |||
7373 | llvm_unreachable("Expression evaluator should not be called on stmts")::llvm::llvm_unreachable_internal("Expression evaluator should not be called on stmts" , "clang/lib/AST/ExprConstant.cpp", 7373); | |||
7374 | } | |||
7375 | bool VisitExpr(const Expr *E) { | |||
7376 | return Error(E); | |||
7377 | } | |||
7378 | ||||
7379 | bool VisitConstantExpr(const ConstantExpr *E) { | |||
7380 | if (E->hasAPValueResult()) | |||
7381 | return DerivedSuccess(E->getAPValueResult(), E); | |||
7382 | ||||
7383 | return StmtVisitorTy::Visit(E->getSubExpr()); | |||
7384 | } | |||
7385 | ||||
7386 | bool VisitParenExpr(const ParenExpr *E) | |||
7387 | { return StmtVisitorTy::Visit(E->getSubExpr()); } | |||
7388 | bool VisitUnaryExtension(const UnaryOperator *E) | |||
7389 | { return StmtVisitorTy::Visit(E->getSubExpr()); } | |||
7390 | bool VisitUnaryPlus(const UnaryOperator *E) | |||
7391 | { return StmtVisitorTy::Visit(E->getSubExpr()); } | |||
7392 | bool VisitChooseExpr(const ChooseExpr *E) | |||
7393 | { return StmtVisitorTy::Visit(E->getChosenSubExpr()); } | |||
7394 | bool VisitGenericSelectionExpr(const GenericSelectionExpr *E) | |||
7395 | { return StmtVisitorTy::Visit(E->getResultExpr()); } | |||
7396 | bool VisitSubstNonTypeTemplateParmExpr(const SubstNonTypeTemplateParmExpr *E) | |||
7397 | { return StmtVisitorTy::Visit(E->getReplacement()); } | |||
7398 | bool VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *E) { | |||
7399 | TempVersionRAII RAII(*Info.CurrentCall); | |||
7400 | SourceLocExprScopeGuard Guard(E, Info.CurrentCall->CurSourceLocExprScope); | |||
7401 | return StmtVisitorTy::Visit(E->getExpr()); | |||
7402 | } | |||
7403 | bool VisitCXXDefaultInitExpr(const CXXDefaultInitExpr *E) { | |||
7404 | TempVersionRAII RAII(*Info.CurrentCall); | |||
7405 | // The initializer may not have been parsed yet, or might be erroneous. | |||
7406 | if (!E->getExpr()) | |||
7407 | return Error(E); | |||
7408 | SourceLocExprScopeGuard Guard(E, Info.CurrentCall->CurSourceLocExprScope); | |||
7409 | return StmtVisitorTy::Visit(E->getExpr()); | |||
7410 | } | |||
7411 | ||||
7412 | bool VisitExprWithCleanups(const ExprWithCleanups *E) { | |||
7413 | FullExpressionRAII Scope(Info); | |||
7414 | return StmtVisitorTy::Visit(E->getSubExpr()) && Scope.destroy(); | |||
7415 | } | |||
7416 | ||||
7417 | // Temporaries are registered when created, so we don't care about | |||
7418 | // CXXBindTemporaryExpr. | |||
7419 | bool VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *E) { | |||
7420 | return StmtVisitorTy::Visit(E->getSubExpr()); | |||
7421 | } | |||
7422 | ||||
7423 | bool VisitCXXReinterpretCastExpr(const CXXReinterpretCastExpr *E) { | |||
7424 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 0; | |||
7425 | return static_cast<Derived*>(this)->VisitCastExpr(E); | |||
| ||||
7426 | } | |||
7427 | bool VisitCXXDynamicCastExpr(const CXXDynamicCastExpr *E) { | |||
7428 | if (!Info.Ctx.getLangOpts().CPlusPlus20) | |||
7429 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 1; | |||
7430 | return static_cast<Derived*>(this)->VisitCastExpr(E); | |||
7431 | } | |||
7432 | bool VisitBuiltinBitCastExpr(const BuiltinBitCastExpr *E) { | |||
7433 | return static_cast<Derived*>(this)->VisitCastExpr(E); | |||
7434 | } | |||
7435 | ||||
7436 | bool VisitBinaryOperator(const BinaryOperator *E) { | |||
7437 | switch (E->getOpcode()) { | |||
7438 | default: | |||
7439 | return Error(E); | |||
7440 | ||||
7441 | case BO_Comma: | |||
7442 | VisitIgnoredValue(E->getLHS()); | |||
7443 | return StmtVisitorTy::Visit(E->getRHS()); | |||
7444 | ||||
7445 | case BO_PtrMemD: | |||
7446 | case BO_PtrMemI: { | |||
7447 | LValue Obj; | |||
7448 | if (!HandleMemberPointerAccess(Info, E, Obj)) | |||
7449 | return false; | |||
7450 | APValue Result; | |||
7451 | if (!handleLValueToRValueConversion(Info, E, E->getType(), Obj, Result)) | |||
7452 | return false; | |||
7453 | return DerivedSuccess(Result, E); | |||
7454 | } | |||
7455 | } | |||
7456 | } | |||
7457 | ||||
7458 | bool VisitCXXRewrittenBinaryOperator(const CXXRewrittenBinaryOperator *E) { | |||
7459 | return StmtVisitorTy::Visit(E->getSemanticForm()); | |||
7460 | } | |||
7461 | ||||
7462 | bool VisitBinaryConditionalOperator(const BinaryConditionalOperator *E) { | |||
7463 | // Evaluate and cache the common expression. We treat it as a temporary, | |||
7464 | // even though it's not quite the same thing. | |||
7465 | LValue CommonLV; | |||
7466 | if (!Evaluate(Info.CurrentCall->createTemporary( | |||
7467 | E->getOpaqueValue(), | |||
7468 | getStorageType(Info.Ctx, E->getOpaqueValue()), | |||
7469 | ScopeKind::FullExpression, CommonLV), | |||
7470 | Info, E->getCommon())) | |||
7471 | return false; | |||
7472 | ||||
7473 | return HandleConditionalOperator(E); | |||
7474 | } | |||
7475 | ||||
7476 | bool VisitConditionalOperator(const ConditionalOperator *E) { | |||
7477 | bool IsBcpCall = false; | |||
7478 | // If the condition (ignoring parens) is a __builtin_constant_p call, | |||
7479 | // the result is a constant expression if it can be folded without | |||
7480 | // side-effects. This is an important GNU extension. See GCC PR38377 | |||
7481 | // for discussion. | |||
7482 | if (const CallExpr *CallCE = | |||
7483 | dyn_cast<CallExpr>(E->getCond()->IgnoreParenCasts())) | |||
7484 | if (CallCE->getBuiltinCallee() == Builtin::BI__builtin_constant_p) | |||
7485 | IsBcpCall = true; | |||
7486 | ||||
7487 | // Always assume __builtin_constant_p(...) ? ... : ... is a potential | |||
7488 | // constant expression; we can't check whether it's potentially foldable. | |||
7489 | // FIXME: We should instead treat __builtin_constant_p as non-constant if | |||
7490 | // it would return 'false' in this mode. | |||
7491 | if (Info.checkingPotentialConstantExpression() && IsBcpCall) | |||
7492 | return false; | |||
7493 | ||||
7494 | FoldConstant Fold(Info, IsBcpCall); | |||
7495 | if (!HandleConditionalOperator(E)) { | |||
7496 | Fold.keepDiagnostics(); | |||
7497 | return false; | |||
7498 | } | |||
7499 | ||||
7500 | return true; | |||
7501 | } | |||
7502 | ||||
7503 | bool VisitOpaqueValueExpr(const OpaqueValueExpr *E) { | |||
7504 | if (APValue *Value = Info.CurrentCall->getCurrentTemporary(E)) | |||
7505 | return DerivedSuccess(*Value, E); | |||
7506 | ||||
7507 | const Expr *Source = E->getSourceExpr(); | |||
7508 | if (!Source) | |||
7509 | return Error(E); | |||
7510 | if (Source == E) { | |||
7511 | assert(0 && "OpaqueValueExpr recursively refers to itself")(static_cast <bool> (0 && "OpaqueValueExpr recursively refers to itself" ) ? void (0) : __assert_fail ("0 && \"OpaqueValueExpr recursively refers to itself\"" , "clang/lib/AST/ExprConstant.cpp", 7511, __extension__ __PRETTY_FUNCTION__ )); | |||
7512 | return Error(E); | |||
7513 | } | |||
7514 | return StmtVisitorTy::Visit(Source); | |||
7515 | } | |||
7516 | ||||
7517 | bool VisitPseudoObjectExpr(const PseudoObjectExpr *E) { | |||
7518 | for (const Expr *SemE : E->semantics()) { | |||
7519 | if (auto *OVE = dyn_cast<OpaqueValueExpr>(SemE)) { | |||
7520 | // FIXME: We can't handle the case where an OpaqueValueExpr is also the | |||
7521 | // result expression: there could be two different LValues that would | |||
7522 | // refer to the same object in that case, and we can't model that. | |||
7523 | if (SemE == E->getResultExpr()) | |||
7524 | return Error(E); | |||
7525 | ||||
7526 | // Unique OVEs get evaluated if and when we encounter them when | |||
7527 | // emitting the rest of the semantic form, rather than eagerly. | |||
7528 | if (OVE->isUnique()) | |||
7529 | continue; | |||
7530 | ||||
7531 | LValue LV; | |||
7532 | if (!Evaluate(Info.CurrentCall->createTemporary( | |||
7533 | OVE, getStorageType(Info.Ctx, OVE), | |||
7534 | ScopeKind::FullExpression, LV), | |||
7535 | Info, OVE->getSourceExpr())) | |||
7536 | return false; | |||
7537 | } else if (SemE == E->getResultExpr()) { | |||
7538 | if (!StmtVisitorTy::Visit(SemE)) | |||
7539 | return false; | |||
7540 | } else { | |||
7541 | if (!EvaluateIgnoredValue(Info, SemE)) | |||
7542 | return false; | |||
7543 | } | |||
7544 | } | |||
7545 | return true; | |||
7546 | } | |||
7547 | ||||
7548 | bool VisitCallExpr(const CallExpr *E) { | |||
7549 | APValue Result; | |||
7550 | if (!handleCallExpr(E, Result, nullptr)) | |||
7551 | return false; | |||
7552 | return DerivedSuccess(Result, E); | |||
7553 | } | |||
7554 | ||||
7555 | bool handleCallExpr(const CallExpr *E, APValue &Result, | |||
7556 | const LValue *ResultSlot) { | |||
7557 | CallScopeRAII CallScope(Info); | |||
7558 | ||||
7559 | const Expr *Callee = E->getCallee()->IgnoreParens(); | |||
7560 | QualType CalleeType = Callee->getType(); | |||
7561 | ||||
7562 | const FunctionDecl *FD = nullptr; | |||
7563 | LValue *This = nullptr, ThisVal; | |||
7564 | auto Args = llvm::makeArrayRef(E->getArgs(), E->getNumArgs()); | |||
7565 | bool HasQualifier = false; | |||
7566 | ||||
7567 | CallRef Call; | |||
7568 | ||||
7569 | // Extract function decl and 'this' pointer from the callee. | |||
7570 | if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { | |||
7571 | const CXXMethodDecl *Member = nullptr; | |||
7572 | if (const MemberExpr *ME = dyn_cast<MemberExpr>(Callee)) { | |||
7573 | // Explicit bound member calls, such as x.f() or p->g(); | |||
7574 | if (!EvaluateObjectArgument(Info, ME->getBase(), ThisVal)) | |||
7575 | return false; | |||
7576 | Member = dyn_cast<CXXMethodDecl>(ME->getMemberDecl()); | |||
7577 | if (!Member) | |||
7578 | return Error(Callee); | |||
7579 | This = &ThisVal; | |||
7580 | HasQualifier = ME->hasQualifier(); | |||
7581 | } else if (const BinaryOperator *BE = dyn_cast<BinaryOperator>(Callee)) { | |||
7582 | // Indirect bound member calls ('.*' or '->*'). | |||
7583 | const ValueDecl *D = | |||
7584 | HandleMemberPointerAccess(Info, BE, ThisVal, false); | |||
7585 | if (!D) | |||
7586 | return false; | |||
7587 | Member = dyn_cast<CXXMethodDecl>(D); | |||
7588 | if (!Member) | |||
7589 | return Error(Callee); | |||
7590 | This = &ThisVal; | |||
7591 | } else if (const auto *PDE = dyn_cast<CXXPseudoDestructorExpr>(Callee)) { | |||
7592 | if (!Info.getLangOpts().CPlusPlus20) | |||
7593 | Info.CCEDiag(PDE, diag::note_constexpr_pseudo_destructor); | |||
7594 | return EvaluateObjectArgument(Info, PDE->getBase(), ThisVal) && | |||
7595 | HandleDestruction(Info, PDE, ThisVal, PDE->getDestroyedType()); | |||
7596 | } else | |||
7597 | return Error(Callee); | |||
7598 | FD = Member; | |||
7599 | } else if (CalleeType->isFunctionPointerType()) { | |||
7600 | LValue CalleeLV; | |||
7601 | if (!EvaluatePointer(Callee, CalleeLV, Info)) | |||
7602 | return false; | |||
7603 | ||||
7604 | if (!CalleeLV.getLValueOffset().isZero()) | |||
7605 | return Error(Callee); | |||
7606 | FD = dyn_cast_or_null<FunctionDecl>( | |||
7607 | CalleeLV.getLValueBase().dyn_cast<const ValueDecl *>()); | |||
7608 | if (!FD) | |||
7609 | return Error(Callee); | |||
7610 | // Don't call function pointers which have been cast to some other type. | |||
7611 | // Per DR (no number yet), the caller and callee can differ in noexcept. | |||
7612 | if (!Info.Ctx.hasSameFunctionTypeIgnoringExceptionSpec( | |||
7613 | CalleeType->getPointeeType(), FD->getType())) { | |||
7614 | return Error(E); | |||
7615 | } | |||
7616 | ||||
7617 | // For an (overloaded) assignment expression, evaluate the RHS before the | |||
7618 | // LHS. | |||
7619 | auto *OCE = dyn_cast<CXXOperatorCallExpr>(E); | |||
7620 | if (OCE && OCE->isAssignmentOp()) { | |||
7621 | assert(Args.size() == 2 && "wrong number of arguments in assignment")(static_cast <bool> (Args.size() == 2 && "wrong number of arguments in assignment" ) ? void (0) : __assert_fail ("Args.size() == 2 && \"wrong number of arguments in assignment\"" , "clang/lib/AST/ExprConstant.cpp", 7621, __extension__ __PRETTY_FUNCTION__ )); | |||
7622 | Call = Info.CurrentCall->createCall(FD); | |||
7623 | if (!EvaluateArgs(isa<CXXMethodDecl>(FD) ? Args.slice(1) : Args, Call, | |||
7624 | Info, FD, /*RightToLeft=*/true)) | |||
7625 | return false; | |||
7626 | } | |||
7627 | ||||
7628 | // Overloaded operator calls to member functions are represented as normal | |||
7629 | // calls with '*this' as the first argument. | |||
7630 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); | |||
7631 | if (MD && !MD->isStatic()) { | |||
7632 | // FIXME: When selecting an implicit conversion for an overloaded | |||
7633 | // operator delete, we sometimes try to evaluate calls to conversion | |||
7634 | // operators without a 'this' parameter! | |||
7635 | if (Args.empty()) | |||
7636 | return Error(E); | |||
7637 | ||||
7638 | if (!EvaluateObjectArgument(Info, Args[0], ThisVal)) | |||
7639 | return false; | |||
7640 | This = &ThisVal; | |||
7641 | Args = Args.slice(1); | |||
7642 | } else if (MD && MD->isLambdaStaticInvoker()) { | |||
7643 | // Map the static invoker for the lambda back to the call operator. | |||
7644 | // Conveniently, we don't have to slice out the 'this' argument (as is | |||
7645 | // being done for the non-static case), since a static member function | |||
7646 | // doesn't have an implicit argument passed in. | |||
7647 | const CXXRecordDecl *ClosureClass = MD->getParent(); | |||
7648 | assert((static_cast <bool> (ClosureClass->captures_begin() == ClosureClass->captures_end() && "Number of captures must be zero for conversion to function-ptr" ) ? void (0) : __assert_fail ("ClosureClass->captures_begin() == ClosureClass->captures_end() && \"Number of captures must be zero for conversion to function-ptr\"" , "clang/lib/AST/ExprConstant.cpp", 7650, __extension__ __PRETTY_FUNCTION__ )) | |||
7649 | ClosureClass->captures_begin() == ClosureClass->captures_end() &&(static_cast <bool> (ClosureClass->captures_begin() == ClosureClass->captures_end() && "Number of captures must be zero for conversion to function-ptr" ) ? void (0) : __assert_fail ("ClosureClass->captures_begin() == ClosureClass->captures_end() && \"Number of captures must be zero for conversion to function-ptr\"" , "clang/lib/AST/ExprConstant.cpp", 7650, __extension__ __PRETTY_FUNCTION__ )) | |||
7650 | "Number of captures must be zero for conversion to function-ptr")(static_cast <bool> (ClosureClass->captures_begin() == ClosureClass->captures_end() && "Number of captures must be zero for conversion to function-ptr" ) ? void (0) : __assert_fail ("ClosureClass->captures_begin() == ClosureClass->captures_end() && \"Number of captures must be zero for conversion to function-ptr\"" , "clang/lib/AST/ExprConstant.cpp", 7650, __extension__ __PRETTY_FUNCTION__ )); | |||
7651 | ||||
7652 | const CXXMethodDecl *LambdaCallOp = | |||
7653 | ClosureClass->getLambdaCallOperator(); | |||
7654 | ||||
7655 | // Set 'FD', the function that will be called below, to the call | |||
7656 | // operator. If the closure object represents a generic lambda, find | |||
7657 | // the corresponding specialization of the call operator. | |||
7658 | ||||
7659 | if (ClosureClass->isGenericLambda()) { | |||
7660 | assert(MD->isFunctionTemplateSpecialization() &&(static_cast <bool> (MD->isFunctionTemplateSpecialization () && "A generic lambda's static-invoker function must be a " "template specialization") ? void (0) : __assert_fail ("MD->isFunctionTemplateSpecialization() && \"A generic lambda's static-invoker function must be a \" \"template specialization\"" , "clang/lib/AST/ExprConstant.cpp", 7662, __extension__ __PRETTY_FUNCTION__ )) | |||
7661 | "A generic lambda's static-invoker function must be a "(static_cast <bool> (MD->isFunctionTemplateSpecialization () && "A generic lambda's static-invoker function must be a " "template specialization") ? void (0) : __assert_fail ("MD->isFunctionTemplateSpecialization() && \"A generic lambda's static-invoker function must be a \" \"template specialization\"" , "clang/lib/AST/ExprConstant.cpp", 7662, __extension__ __PRETTY_FUNCTION__ )) | |||
7662 | "template specialization")(static_cast <bool> (MD->isFunctionTemplateSpecialization () && "A generic lambda's static-invoker function must be a " "template specialization") ? void (0) : __assert_fail ("MD->isFunctionTemplateSpecialization() && \"A generic lambda's static-invoker function must be a \" \"template specialization\"" , "clang/lib/AST/ExprConstant.cpp", 7662, __extension__ __PRETTY_FUNCTION__ )); | |||
7663 | const TemplateArgumentList *TAL = MD->getTemplateSpecializationArgs(); | |||
7664 | FunctionTemplateDecl *CallOpTemplate = | |||
7665 | LambdaCallOp->getDescribedFunctionTemplate(); | |||
7666 | void *InsertPos = nullptr; | |||
7667 | FunctionDecl *CorrespondingCallOpSpecialization = | |||
7668 | CallOpTemplate->findSpecialization(TAL->asArray(), InsertPos); | |||
7669 | assert(CorrespondingCallOpSpecialization &&(static_cast <bool> (CorrespondingCallOpSpecialization && "We must always have a function call operator specialization " "that corresponds to our static invoker specialization") ? void (0) : __assert_fail ("CorrespondingCallOpSpecialization && \"We must always have a function call operator specialization \" \"that corresponds to our static invoker specialization\"" , "clang/lib/AST/ExprConstant.cpp", 7671, __extension__ __PRETTY_FUNCTION__ )) | |||
7670 | "We must always have a function call operator specialization "(static_cast <bool> (CorrespondingCallOpSpecialization && "We must always have a function call operator specialization " "that corresponds to our static invoker specialization") ? void (0) : __assert_fail ("CorrespondingCallOpSpecialization && \"We must always have a function call operator specialization \" \"that corresponds to our static invoker specialization\"" , "clang/lib/AST/ExprConstant.cpp", 7671, __extension__ __PRETTY_FUNCTION__ )) | |||
7671 | "that corresponds to our static invoker specialization")(static_cast <bool> (CorrespondingCallOpSpecialization && "We must always have a function call operator specialization " "that corresponds to our static invoker specialization") ? void (0) : __assert_fail ("CorrespondingCallOpSpecialization && \"We must always have a function call operator specialization \" \"that corresponds to our static invoker specialization\"" , "clang/lib/AST/ExprConstant.cpp", 7671, __extension__ __PRETTY_FUNCTION__ )); | |||
7672 | FD = cast<CXXMethodDecl>(CorrespondingCallOpSpecialization); | |||
7673 | } else | |||
7674 | FD = LambdaCallOp; | |||
7675 | } else if (FD->isReplaceableGlobalAllocationFunction()) { | |||
7676 | if (FD->getDeclName().getCXXOverloadedOperator() == OO_New || | |||
7677 | FD->getDeclName().getCXXOverloadedOperator() == OO_Array_New) { | |||
7678 | LValue Ptr; | |||
7679 | if (!HandleOperatorNewCall(Info, E, Ptr)) | |||
7680 | return false; | |||
7681 | Ptr.moveInto(Result); | |||
7682 | return CallScope.destroy(); | |||
7683 | } else { | |||
7684 | return HandleOperatorDeleteCall(Info, E) && CallScope.destroy(); | |||
7685 | } | |||
7686 | } | |||
7687 | } else | |||
7688 | return Error(E); | |||
7689 | ||||
7690 | // Evaluate the arguments now if we've not already done so. | |||
7691 | if (!Call) { | |||
7692 | Call = Info.CurrentCall->createCall(FD); | |||
7693 | if (!EvaluateArgs(Args, Call, Info, FD)) | |||
7694 | return false; | |||
7695 | } | |||
7696 | ||||
7697 | SmallVector<QualType, 4> CovariantAdjustmentPath; | |||
7698 | if (This) { | |||
7699 | auto *NamedMember = dyn_cast<CXXMethodDecl>(FD); | |||
7700 | if (NamedMember && NamedMember->isVirtual() && !HasQualifier) { | |||
7701 | // Perform virtual dispatch, if necessary. | |||
7702 | FD = HandleVirtualDispatch(Info, E, *This, NamedMember, | |||
7703 | CovariantAdjustmentPath); | |||
7704 | if (!FD) | |||
7705 | return false; | |||
7706 | } else { | |||
7707 | // Check that the 'this' pointer points to an object of the right type. | |||
7708 | // FIXME: If this is an assignment operator call, we may need to change | |||
7709 | // the active union member before we check this. | |||
7710 | if (!checkNonVirtualMemberCallThisPointer(Info, E, *This, NamedMember)) | |||
7711 | return false; | |||
7712 | } | |||
7713 | } | |||
7714 | ||||
7715 | // Destructor calls are different enough that they have their own codepath. | |||
7716 | if (auto *DD = dyn_cast<CXXDestructorDecl>(FD)) { | |||
7717 | assert(This && "no 'this' pointer for destructor call")(static_cast <bool> (This && "no 'this' pointer for destructor call" ) ? void (0) : __assert_fail ("This && \"no 'this' pointer for destructor call\"" , "clang/lib/AST/ExprConstant.cpp", 7717, __extension__ __PRETTY_FUNCTION__ )); | |||
7718 | return HandleDestruction(Info, E, *This, | |||
7719 | Info.Ctx.getRecordType(DD->getParent())) && | |||
7720 | CallScope.destroy(); | |||
7721 | } | |||
7722 | ||||
7723 | const FunctionDecl *Definition = nullptr; | |||
7724 | Stmt *Body = FD->getBody(Definition); | |||
7725 | ||||
7726 | if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition, Body) || | |||
7727 | !HandleFunctionCall(E->getExprLoc(), Definition, This, Args, Call, | |||
7728 | Body, Info, Result, ResultSlot)) | |||
7729 | return false; | |||
7730 | ||||
7731 | if (!CovariantAdjustmentPath.empty() && | |||
7732 | !HandleCovariantReturnAdjustment(Info, E, Result, | |||
7733 | CovariantAdjustmentPath)) | |||
7734 | return false; | |||
7735 | ||||
7736 | return CallScope.destroy(); | |||
7737 | } | |||
7738 | ||||
7739 | bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { | |||
7740 | return StmtVisitorTy::Visit(E->getInitializer()); | |||
7741 | } | |||
7742 | bool VisitInitListExpr(const InitListExpr *E) { | |||
7743 | if (E->getNumInits() == 0) | |||
7744 | return DerivedZeroInitialization(E); | |||
7745 | if (E->getNumInits() == 1) | |||
7746 | return StmtVisitorTy::Visit(E->getInit(0)); | |||
7747 | return Error(E); | |||
7748 | } | |||
7749 | bool VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) { | |||
7750 | return DerivedZeroInitialization(E); | |||
7751 | } | |||
7752 | bool VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) { | |||
7753 | return DerivedZeroInitialization(E); | |||
7754 | } | |||
7755 | bool VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) { | |||
7756 | return DerivedZeroInitialization(E); | |||
7757 | } | |||
7758 | ||||
7759 | /// A member expression where the object is a prvalue is itself a prvalue. | |||
7760 | bool VisitMemberExpr(const MemberExpr *E) { | |||
7761 | assert(!Info.Ctx.getLangOpts().CPlusPlus11 &&(static_cast <bool> (!Info.Ctx.getLangOpts().CPlusPlus11 && "missing temporary materialization conversion") ? void (0) : __assert_fail ("!Info.Ctx.getLangOpts().CPlusPlus11 && \"missing temporary materialization conversion\"" , "clang/lib/AST/ExprConstant.cpp", 7762, __extension__ __PRETTY_FUNCTION__ )) | |||
7762 | "missing temporary materialization conversion")(static_cast <bool> (!Info.Ctx.getLangOpts().CPlusPlus11 && "missing temporary materialization conversion") ? void (0) : __assert_fail ("!Info.Ctx.getLangOpts().CPlusPlus11 && \"missing temporary materialization conversion\"" , "clang/lib/AST/ExprConstant.cpp", 7762, __extension__ __PRETTY_FUNCTION__ )); | |||
7763 | assert(!E->isArrow() && "missing call to bound member function?")(static_cast <bool> (!E->isArrow() && "missing call to bound member function?" ) ? void (0) : __assert_fail ("!E->isArrow() && \"missing call to bound member function?\"" , "clang/lib/AST/ExprConstant.cpp", 7763, __extension__ __PRETTY_FUNCTION__ )); | |||
7764 | ||||
7765 | APValue Val; | |||
7766 | if (!Evaluate(Val, Info, E->getBase())) | |||
7767 | return false; | |||
7768 | ||||
7769 | QualType BaseTy = E->getBase()->getType(); | |||
7770 | ||||
7771 | const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl()); | |||
7772 | if (!FD) return Error(E); | |||
7773 | assert(!FD->getType()->isReferenceType() && "prvalue reference?")(static_cast <bool> (!FD->getType()->isReferenceType () && "prvalue reference?") ? void (0) : __assert_fail ("!FD->getType()->isReferenceType() && \"prvalue reference?\"" , "clang/lib/AST/ExprConstant.cpp", 7773, __extension__ __PRETTY_FUNCTION__ )); | |||
7774 | assert(BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() ==(static_cast <bool> (BaseTy->castAs<RecordType> ()->getDecl()->getCanonicalDecl() == FD->getParent() ->getCanonicalDecl() && "record / field mismatch") ? void (0) : __assert_fail ("BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\"" , "clang/lib/AST/ExprConstant.cpp", 7775, __extension__ __PRETTY_FUNCTION__ )) | |||
7775 | FD->getParent()->getCanonicalDecl() && "record / field mismatch")(static_cast <bool> (BaseTy->castAs<RecordType> ()->getDecl()->getCanonicalDecl() == FD->getParent() ->getCanonicalDecl() && "record / field mismatch") ? void (0) : __assert_fail ("BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\"" , "clang/lib/AST/ExprConstant.cpp", 7775, __extension__ __PRETTY_FUNCTION__ )); | |||
7776 | ||||
7777 | // Note: there is no lvalue base here. But this case should only ever | |||
7778 | // happen in C or in C++98, where we cannot be evaluating a constexpr | |||
7779 | // constructor, which is the only case the base matters. | |||
7780 | CompleteObject Obj(APValue::LValueBase(), &Val, BaseTy); | |||
7781 | SubobjectDesignator Designator(BaseTy); | |||
7782 | Designator.addDeclUnchecked(FD); | |||
7783 | ||||
7784 | APValue Result; | |||
7785 | return extractSubobject(Info, E, Obj, Designator, Result) && | |||
7786 | DerivedSuccess(Result, E); | |||
7787 | } | |||
7788 | ||||
7789 | bool VisitExtVectorElementExpr(const ExtVectorElementExpr *E) { | |||
7790 | APValue Val; | |||
7791 | if (!Evaluate(Val, Info, E->getBase())) | |||
7792 | return false; | |||
7793 | ||||
7794 | if (Val.isVector()) { | |||
7795 | SmallVector<uint32_t, 4> Indices; | |||
7796 | E->getEncodedElementAccess(Indices); | |||
7797 | if (Indices.size() == 1) { | |||
7798 | // Return scalar. | |||
7799 | return DerivedSuccess(Val.getVectorElt(Indices[0]), E); | |||
7800 | } else { | |||
7801 | // Construct new APValue vector. | |||
7802 | SmallVector<APValue, 4> Elts; | |||
7803 | for (unsigned I = 0; I < Indices.size(); ++I) { | |||
7804 | Elts.push_back(Val.getVectorElt(Indices[I])); | |||
7805 | } | |||
7806 | APValue VecResult(Elts.data(), Indices.size()); | |||
7807 | return DerivedSuccess(VecResult, E); | |||
7808 | } | |||
7809 | } | |||
7810 | ||||
7811 | return false; | |||
7812 | } | |||
7813 | ||||
7814 | bool VisitCastExpr(const CastExpr *E) { | |||
7815 | switch (E->getCastKind()) { | |||
7816 | default: | |||
7817 | break; | |||
7818 | ||||
7819 | case CK_AtomicToNonAtomic: { | |||
7820 | APValue AtomicVal; | |||
7821 | // This does not need to be done in place even for class/array types: | |||
7822 | // atomic-to-non-atomic conversion implies copying the object | |||
7823 | // representation. | |||
7824 | if (!Evaluate(AtomicVal, Info, E->getSubExpr())) | |||
7825 | return false; | |||
7826 | return DerivedSuccess(AtomicVal, E); | |||
7827 | } | |||
7828 | ||||
7829 | case CK_NoOp: | |||
7830 | case CK_UserDefinedConversion: | |||
7831 | return StmtVisitorTy::Visit(E->getSubExpr()); | |||
7832 | ||||
7833 | case CK_LValueToRValue: { | |||
7834 | LValue LVal; | |||
7835 | if (!EvaluateLValue(E->getSubExpr(), LVal, Info)) | |||
7836 | return false; | |||
7837 | APValue RVal; | |||
7838 | // Note, we use the subexpression's type in order to retain cv-qualifiers. | |||
7839 | if (!handleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), | |||
7840 | LVal, RVal)) | |||
7841 | return false; | |||
7842 | return DerivedSuccess(RVal, E); | |||
7843 | } | |||
7844 | case CK_LValueToRValueBitCast: { | |||
7845 | APValue DestValue, SourceValue; | |||
7846 | if (!Evaluate(SourceValue, Info, E->getSubExpr())) | |||
7847 | return false; | |||
7848 | if (!handleLValueToRValueBitCast(Info, DestValue, SourceValue, E)) | |||
7849 | return false; | |||
7850 | return DerivedSuccess(DestValue, E); | |||
7851 | } | |||
7852 | ||||
7853 | case CK_AddressSpaceConversion: { | |||
7854 | APValue Value; | |||
7855 | if (!Evaluate(Value, Info, E->getSubExpr())) | |||
7856 | return false; | |||
7857 | return DerivedSuccess(Value, E); | |||
7858 | } | |||
7859 | } | |||
7860 | ||||
7861 | return Error(E); | |||
7862 | } | |||
7863 | ||||
7864 | bool VisitUnaryPostInc(const UnaryOperator *UO) { | |||
7865 | return VisitUnaryPostIncDec(UO); | |||
7866 | } | |||
7867 | bool VisitUnaryPostDec(const UnaryOperator *UO) { | |||
7868 | return VisitUnaryPostIncDec(UO); | |||
7869 | } | |||
7870 | bool VisitUnaryPostIncDec(const UnaryOperator *UO) { | |||
7871 | if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure()) | |||
7872 | return Error(UO); | |||
7873 | ||||
7874 | LValue LVal; | |||
7875 | if (!EvaluateLValue(UO->getSubExpr(), LVal, Info)) | |||
7876 | return false; | |||
7877 | APValue RVal; | |||
7878 | if (!handleIncDec(this->Info, UO, LVal, UO->getSubExpr()->getType(), | |||
7879 | UO->isIncrementOp(), &RVal)) | |||
7880 | return false; | |||
7881 | return DerivedSuccess(RVal, UO); | |||
7882 | } | |||
7883 | ||||
7884 | bool VisitStmtExpr(const StmtExpr *E) { | |||
7885 | // We will have checked the full-expressions inside the statement expression | |||
7886 | // when they were completed, and don't need to check them again now. | |||
7887 | llvm::SaveAndRestore<bool> NotCheckingForUB( | |||
7888 | Info.CheckingForUndefinedBehavior, false); | |||
7889 | ||||
7890 | const CompoundStmt *CS = E->getSubStmt(); | |||
7891 | if (CS->body_empty()) | |||
7892 | return true; | |||
7893 | ||||
7894 | BlockScopeRAII Scope(Info); | |||
7895 | for (CompoundStmt::const_body_iterator BI = CS->body_begin(), | |||
7896 | BE = CS->body_end(); | |||
7897 | /**/; ++BI) { | |||
7898 | if (BI + 1 == BE) { | |||
7899 | const Expr *FinalExpr = dyn_cast<Expr>(*BI); | |||
7900 | if (!FinalExpr) { | |||
7901 | Info.FFDiag((*BI)->getBeginLoc(), | |||
7902 | diag::note_constexpr_stmt_expr_unsupported); | |||
7903 | return false; | |||
7904 | } | |||
7905 | return this->Visit(FinalExpr) && Scope.destroy(); | |||
7906 | } | |||
7907 | ||||
7908 | APValue ReturnValue; | |||
7909 | StmtResult Result = { ReturnValue, nullptr }; | |||
7910 | EvalStmtResult ESR = EvaluateStmt(Result, Info, *BI); | |||
7911 | if (ESR != ESR_Succeeded) { | |||
7912 | // FIXME: If the statement-expression terminated due to 'return', | |||
7913 | // 'break', or 'continue', it would be nice to propagate that to | |||
7914 | // the outer statement evaluation rather than bailing out. | |||
7915 | if (ESR != ESR_Failed) | |||
7916 | Info.FFDiag((*BI)->getBeginLoc(), | |||
7917 | diag::note_constexpr_stmt_expr_unsupported); | |||
7918 | return false; | |||
7919 | } | |||
7920 | } | |||
7921 | ||||
7922 | llvm_unreachable("Return from function from the loop above.")::llvm::llvm_unreachable_internal("Return from function from the loop above." , "clang/lib/AST/ExprConstant.cpp", 7922); | |||
7923 | } | |||
7924 | ||||
7925 | /// Visit a value which is evaluated, but whose value is ignored. | |||
7926 | void VisitIgnoredValue(const Expr *E) { | |||
7927 | EvaluateIgnoredValue(Info, E); | |||
7928 | } | |||
7929 | ||||
7930 | /// Potentially visit a MemberExpr's base expression. | |||
7931 | void VisitIgnoredBaseExpression(const Expr *E) { | |||
7932 | // While MSVC doesn't evaluate the base expression, it does diagnose the | |||
7933 | // presence of side-effecting behavior. | |||
7934 | if (Info.getLangOpts().MSVCCompat && !E->HasSideEffects(Info.Ctx)) | |||
7935 | return; | |||
7936 | VisitIgnoredValue(E); | |||
7937 | } | |||
7938 | }; | |||
7939 | ||||
7940 | } // namespace | |||
7941 | ||||
7942 | //===----------------------------------------------------------------------===// | |||
7943 | // Common base class for lvalue and temporary evaluation. | |||
7944 | //===----------------------------------------------------------------------===// | |||
7945 | namespace { | |||
7946 | template<class Derived> | |||
7947 | class LValueExprEvaluatorBase | |||
7948 | : public ExprEvaluatorBase<Derived> { | |||
7949 | protected: | |||
7950 | LValue &Result; | |||
7951 | bool InvalidBaseOK; | |||
7952 | typedef LValueExprEvaluatorBase LValueExprEvaluatorBaseTy; | |||
7953 | typedef ExprEvaluatorBase<Derived> ExprEvaluatorBaseTy; | |||
7954 | ||||
7955 | bool Success(APValue::LValueBase B) { | |||
7956 | Result.set(B); | |||
7957 | return true; | |||
7958 | } | |||
7959 | ||||
7960 | bool evaluatePointer(const Expr *E, LValue &Result) { | |||
7961 | return EvaluatePointer(E, Result, this->Info, InvalidBaseOK); | |||
7962 | } | |||
7963 | ||||
7964 | public: | |||
7965 | LValueExprEvaluatorBase(EvalInfo &Info, LValue &Result, bool InvalidBaseOK) | |||
7966 | : ExprEvaluatorBaseTy(Info), Result(Result), | |||
7967 | InvalidBaseOK(InvalidBaseOK) {} | |||
7968 | ||||
7969 | bool Success(const APValue &V, const Expr *E) { | |||
7970 | Result.setFrom(this->Info.Ctx, V); | |||
7971 | return true; | |||
7972 | } | |||
7973 | ||||
7974 | bool VisitMemberExpr(const MemberExpr *E) { | |||
7975 | // Handle non-static data members. | |||
7976 | QualType BaseTy; | |||
7977 | bool EvalOK; | |||
7978 | if (E->isArrow()) { | |||
7979 | EvalOK = evaluatePointer(E->getBase(), Result); | |||
7980 | BaseTy = E->getBase()->getType()->castAs<PointerType>()->getPointeeType(); | |||
7981 | } else if (E->getBase()->isPRValue()) { | |||
7982 | assert(E->getBase()->getType()->isRecordType())(static_cast <bool> (E->getBase()->getType()-> isRecordType()) ? void (0) : __assert_fail ("E->getBase()->getType()->isRecordType()" , "clang/lib/AST/ExprConstant.cpp", 7982, __extension__ __PRETTY_FUNCTION__ )); | |||
7983 | EvalOK = EvaluateTemporary(E->getBase(), Result, this->Info); | |||
7984 | BaseTy = E->getBase()->getType(); | |||
7985 | } else { | |||
7986 | EvalOK = this->Visit(E->getBase()); | |||
7987 | BaseTy = E->getBase()->getType(); | |||
7988 | } | |||
7989 | if (!EvalOK) { | |||
7990 | if (!InvalidBaseOK) | |||
7991 | return false; | |||
7992 | Result.setInvalid(E); | |||
7993 | return true; | |||
7994 | } | |||
7995 | ||||
7996 | const ValueDecl *MD = E->getMemberDecl(); | |||
7997 | if (const FieldDecl *FD = dyn_cast<FieldDecl>(E->getMemberDecl())) { | |||
7998 | assert(BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() ==(static_cast <bool> (BaseTy->castAs<RecordType> ()->getDecl()->getCanonicalDecl() == FD->getParent() ->getCanonicalDecl() && "record / field mismatch") ? void (0) : __assert_fail ("BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\"" , "clang/lib/AST/ExprConstant.cpp", 7999, __extension__ __PRETTY_FUNCTION__ )) | |||
7999 | FD->getParent()->getCanonicalDecl() && "record / field mismatch")(static_cast <bool> (BaseTy->castAs<RecordType> ()->getDecl()->getCanonicalDecl() == FD->getParent() ->getCanonicalDecl() && "record / field mismatch") ? void (0) : __assert_fail ("BaseTy->castAs<RecordType>()->getDecl()->getCanonicalDecl() == FD->getParent()->getCanonicalDecl() && \"record / field mismatch\"" , "clang/lib/AST/ExprConstant.cpp", 7999, __extension__ __PRETTY_FUNCTION__ )); | |||
8000 | (void)BaseTy; | |||
8001 | if (!HandleLValueMember(this->Info, E, Result, FD)) | |||
8002 | return false; | |||
8003 | } else if (const IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(MD)) { | |||
8004 | if (!HandleLValueIndirectMember(this->Info, E, Result, IFD)) | |||
8005 | return false; | |||
8006 | } else | |||
8007 | return this->Error(E); | |||
8008 | ||||
8009 | if (MD->getType()->isReferenceType()) { | |||
8010 | APValue RefValue; | |||
8011 | if (!handleLValueToRValueConversion(this->Info, E, MD->getType(), Result, | |||
8012 | RefValue)) | |||
8013 | return false; | |||
8014 | return Success(RefValue, E); | |||
8015 | } | |||
8016 | return true; | |||
8017 | } | |||
8018 | ||||
8019 | bool VisitBinaryOperator(const BinaryOperator *E) { | |||
8020 | switch (E->getOpcode()) { | |||
8021 | default: | |||
8022 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | |||
8023 | ||||
8024 | case BO_PtrMemD: | |||
8025 | case BO_PtrMemI: | |||
8026 | return HandleMemberPointerAccess(this->Info, E, Result); | |||
8027 | } | |||
8028 | } | |||
8029 | ||||
8030 | bool VisitCastExpr(const CastExpr *E) { | |||
8031 | switch (E->getCastKind()) { | |||
8032 | default: | |||
8033 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
8034 | ||||
8035 | case CK_DerivedToBase: | |||
8036 | case CK_UncheckedDerivedToBase: | |||
8037 | if (!this->Visit(E->getSubExpr())) | |||
8038 | return false; | |||
8039 | ||||
8040 | // Now figure out the necessary offset to add to the base LV to get from | |||
8041 | // the derived class to the base class. | |||
8042 | return HandleLValueBasePath(this->Info, E, E->getSubExpr()->getType(), | |||
8043 | Result); | |||
8044 | } | |||
8045 | } | |||
8046 | }; | |||
8047 | } | |||
8048 | ||||
8049 | //===----------------------------------------------------------------------===// | |||
8050 | // LValue Evaluation | |||
8051 | // | |||
8052 | // This is used for evaluating lvalues (in C and C++), xvalues (in C++11), | |||
8053 | // function designators (in C), decl references to void objects (in C), and | |||
8054 | // temporaries (if building with -Wno-address-of-temporary). | |||
8055 | // | |||
8056 | // LValue evaluation produces values comprising a base expression of one of the | |||
8057 | // following types: | |||
8058 | // - Declarations | |||
8059 | // * VarDecl | |||
8060 | // * FunctionDecl | |||
8061 | // - Literals | |||
8062 | // * CompoundLiteralExpr in C (and in global scope in C++) | |||
8063 | // * StringLiteral | |||
8064 | // * PredefinedExpr | |||
8065 | // * ObjCStringLiteralExpr | |||
8066 | // * ObjCEncodeExpr | |||
8067 | // * AddrLabelExpr | |||
8068 | // * BlockExpr | |||
8069 | // * CallExpr for a MakeStringConstant builtin | |||
8070 | // - typeid(T) expressions, as TypeInfoLValues | |||
8071 | // - Locals and temporaries | |||
8072 | // * MaterializeTemporaryExpr | |||
8073 | // * Any Expr, with a CallIndex indicating the function in which the temporary | |||
8074 | // was evaluated, for cases where the MaterializeTemporaryExpr is missing | |||
8075 | // from the AST (FIXME). | |||
8076 | // * A MaterializeTemporaryExpr that has static storage duration, with no | |||
8077 | // CallIndex, for a lifetime-extended temporary. | |||
8078 | // * The ConstantExpr that is currently being evaluated during evaluation of an | |||
8079 | // immediate invocation. | |||
8080 | // plus an offset in bytes. | |||
8081 | //===----------------------------------------------------------------------===// | |||
8082 | namespace { | |||
8083 | class LValueExprEvaluator | |||
8084 | : public LValueExprEvaluatorBase<LValueExprEvaluator> { | |||
8085 | public: | |||
8086 | LValueExprEvaluator(EvalInfo &Info, LValue &Result, bool InvalidBaseOK) : | |||
8087 | LValueExprEvaluatorBaseTy(Info, Result, InvalidBaseOK) {} | |||
8088 | ||||
8089 | bool VisitVarDecl(const Expr *E, const VarDecl *VD); | |||
8090 | bool VisitUnaryPreIncDec(const UnaryOperator *UO); | |||
8091 | ||||
8092 | bool VisitDeclRefExpr(const DeclRefExpr *E); | |||
8093 | bool VisitPredefinedExpr(const PredefinedExpr *E) { return Success(E); } | |||
8094 | bool VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E); | |||
8095 | bool VisitCompoundLiteralExpr(const CompoundLiteralExpr *E); | |||
8096 | bool VisitMemberExpr(const MemberExpr *E); | |||
8097 | bool VisitStringLiteral(const StringLiteral *E) { return Success(E); } | |||
8098 | bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E) { return Success(E); } | |||
8099 | bool VisitCXXTypeidExpr(const CXXTypeidExpr *E); | |||
8100 | bool VisitCXXUuidofExpr(const CXXUuidofExpr *E); | |||
8101 | bool VisitArraySubscriptExpr(const ArraySubscriptExpr *E); | |||
8102 | bool VisitUnaryDeref(const UnaryOperator *E); | |||
8103 | bool VisitUnaryReal(const UnaryOperator *E); | |||
8104 | bool VisitUnaryImag(const UnaryOperator *E); | |||
8105 | bool VisitUnaryPreInc(const UnaryOperator *UO) { | |||
8106 | return VisitUnaryPreIncDec(UO); | |||
8107 | } | |||
8108 | bool VisitUnaryPreDec(const UnaryOperator *UO) { | |||
8109 | return VisitUnaryPreIncDec(UO); | |||
8110 | } | |||
8111 | bool VisitBinAssign(const BinaryOperator *BO); | |||
8112 | bool VisitCompoundAssignOperator(const CompoundAssignOperator *CAO); | |||
8113 | ||||
8114 | bool VisitCastExpr(const CastExpr *E) { | |||
8115 | switch (E->getCastKind()) { | |||
8116 | default: | |||
8117 | return LValueExprEvaluatorBaseTy::VisitCastExpr(E); | |||
8118 | ||||
8119 | case CK_LValueBitCast: | |||
8120 | this->CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; | |||
8121 | if (!Visit(E->getSubExpr())) | |||
8122 | return false; | |||
8123 | Result.Designator.setInvalid(); | |||
8124 | return true; | |||
8125 | ||||
8126 | case CK_BaseToDerived: | |||
8127 | if (!Visit(E->getSubExpr())) | |||
8128 | return false; | |||
8129 | return HandleBaseToDerivedCast(Info, E, Result); | |||
8130 | ||||
8131 | case CK_Dynamic: | |||
8132 | if (!Visit(E->getSubExpr())) | |||
8133 | return false; | |||
8134 | return HandleDynamicCast(Info, cast<ExplicitCastExpr>(E), Result); | |||
8135 | } | |||
8136 | } | |||
8137 | }; | |||
8138 | } // end anonymous namespace | |||
8139 | ||||
8140 | /// Evaluate an expression as an lvalue. This can be legitimately called on | |||
8141 | /// expressions which are not glvalues, in three cases: | |||
8142 | /// * function designators in C, and | |||
8143 | /// * "extern void" objects | |||
8144 | /// * @selector() expressions in Objective-C | |||
8145 | static bool EvaluateLValue(const Expr *E, LValue &Result, EvalInfo &Info, | |||
8146 | bool InvalidBaseOK) { | |||
8147 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 8147, __extension__ __PRETTY_FUNCTION__)); | |||
8148 | assert(E->isGLValue() || E->getType()->isFunctionType() ||(static_cast <bool> (E->isGLValue() || E->getType ()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E)) ? void (0) : __assert_fail ( "E->isGLValue() || E->getType()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E)" , "clang/lib/AST/ExprConstant.cpp", 8149, __extension__ __PRETTY_FUNCTION__ )) | |||
8149 | E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E))(static_cast <bool> (E->isGLValue() || E->getType ()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E)) ? void (0) : __assert_fail ( "E->isGLValue() || E->getType()->isFunctionType() || E->getType()->isVoidType() || isa<ObjCSelectorExpr>(E)" , "clang/lib/AST/ExprConstant.cpp", 8149, __extension__ __PRETTY_FUNCTION__ )); | |||
8150 | return LValueExprEvaluator(Info, Result, InvalidBaseOK).Visit(E); | |||
8151 | } | |||
8152 | ||||
8153 | bool LValueExprEvaluator::VisitDeclRefExpr(const DeclRefExpr *E) { | |||
8154 | const NamedDecl *D = E->getDecl(); | |||
8155 | if (isa<FunctionDecl, MSGuidDecl, TemplateParamObjectDecl>(D)) | |||
8156 | return Success(cast<ValueDecl>(D)); | |||
8157 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) | |||
8158 | return VisitVarDecl(E, VD); | |||
8159 | if (const BindingDecl *BD = dyn_cast<BindingDecl>(D)) | |||
8160 | return Visit(BD->getBinding()); | |||
8161 | return Error(E); | |||
8162 | } | |||
8163 | ||||
8164 | ||||
8165 | bool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) { | |||
8166 | ||||
8167 | // If we are within a lambda's call operator, check whether the 'VD' referred | |||
8168 | // to within 'E' actually represents a lambda-capture that maps to a | |||
8169 | // data-member/field within the closure object, and if so, evaluate to the | |||
8170 | // field or what the field refers to. | |||
8171 | if (Info.CurrentCall && isLambdaCallOperator(Info.CurrentCall->Callee) && | |||
8172 | isa<DeclRefExpr>(E) && | |||
8173 | cast<DeclRefExpr>(E)->refersToEnclosingVariableOrCapture()) { | |||
8174 | // We don't always have a complete capture-map when checking or inferring if | |||
8175 | // the function call operator meets the requirements of a constexpr function | |||
8176 | // - but we don't need to evaluate the captures to determine constexprness | |||
8177 | // (dcl.constexpr C++17). | |||
8178 | if (Info.checkingPotentialConstantExpression()) | |||
8179 | return false; | |||
8180 | ||||
8181 | if (auto *FD = Info.CurrentCall->LambdaCaptureFields.lookup(VD)) { | |||
8182 | // Start with 'Result' referring to the complete closure object... | |||
8183 | Result = *Info.CurrentCall->This; | |||
8184 | // ... then update it to refer to the field of the closure object | |||
8185 | // that represents the capture. | |||
8186 | if (!HandleLValueMember(Info, E, Result, FD)) | |||
8187 | return false; | |||
8188 | // And if the field is of reference type, update 'Result' to refer to what | |||
8189 | // the field refers to. | |||
8190 | if (FD->getType()->isReferenceType()) { | |||
8191 | APValue RVal; | |||
8192 | if (!handleLValueToRValueConversion(Info, E, FD->getType(), Result, | |||
8193 | RVal)) | |||
8194 | return false; | |||
8195 | Result.setFrom(Info.Ctx, RVal); | |||
8196 | } | |||
8197 | return true; | |||
8198 | } | |||
8199 | } | |||
8200 | ||||
8201 | CallStackFrame *Frame = nullptr; | |||
8202 | unsigned Version = 0; | |||
8203 | if (VD->hasLocalStorage()) { | |||
8204 | // Only if a local variable was declared in the function currently being | |||
8205 | // evaluated, do we expect to be able to find its value in the current | |||
8206 | // frame. (Otherwise it was likely declared in an enclosing context and | |||
8207 | // could either have a valid evaluatable value (for e.g. a constexpr | |||
8208 | // variable) or be ill-formed (and trigger an appropriate evaluation | |||
8209 | // diagnostic)). | |||
8210 | CallStackFrame *CurrFrame = Info.CurrentCall; | |||
8211 | if (CurrFrame->Callee && CurrFrame->Callee->Equals(VD->getDeclContext())) { | |||
8212 | // Function parameters are stored in some caller's frame. (Usually the | |||
8213 | // immediate caller, but for an inherited constructor they may be more | |||
8214 | // distant.) | |||
8215 | if (auto *PVD = dyn_cast<ParmVarDecl>(VD)) { | |||
8216 | if (CurrFrame->Arguments) { | |||
8217 | VD = CurrFrame->Arguments.getOrigParam(PVD); | |||
8218 | Frame = | |||
8219 | Info.getCallFrameAndDepth(CurrFrame->Arguments.CallIndex).first; | |||
8220 | Version = CurrFrame->Arguments.Version; | |||
8221 | } | |||
8222 | } else { | |||
8223 | Frame = CurrFrame; | |||
8224 | Version = CurrFrame->getCurrentTemporaryVersion(VD); | |||
8225 | } | |||
8226 | } | |||
8227 | } | |||
8228 | ||||
8229 | if (!VD->getType()->isReferenceType()) { | |||
8230 | if (Frame) { | |||
8231 | Result.set({VD, Frame->Index, Version}); | |||
8232 | return true; | |||
8233 | } | |||
8234 | return Success(VD); | |||
8235 | } | |||
8236 | ||||
8237 | if (!Info.getLangOpts().CPlusPlus11) { | |||
8238 | Info.CCEDiag(E, diag::note_constexpr_ltor_non_integral, 1) | |||
8239 | << VD << VD->getType(); | |||
8240 | Info.Note(VD->getLocation(), diag::note_declared_at); | |||
8241 | } | |||
8242 | ||||
8243 | APValue *V; | |||
8244 | if (!evaluateVarDeclInit(Info, E, VD, Frame, Version, V)) | |||
8245 | return false; | |||
8246 | if (!V->hasValue()) { | |||
8247 | // FIXME: Is it possible for V to be indeterminate here? If so, we should | |||
8248 | // adjust the diagnostic to say that. | |||
8249 | if (!Info.checkingPotentialConstantExpression()) | |||
8250 | Info.FFDiag(E, diag::note_constexpr_use_uninit_reference); | |||
8251 | return false; | |||
8252 | } | |||
8253 | return Success(*V, E); | |||
8254 | } | |||
8255 | ||||
8256 | bool LValueExprEvaluator::VisitMaterializeTemporaryExpr( | |||
8257 | const MaterializeTemporaryExpr *E) { | |||
8258 | // Walk through the expression to find the materialized temporary itself. | |||
8259 | SmallVector<const Expr *, 2> CommaLHSs; | |||
8260 | SmallVector<SubobjectAdjustment, 2> Adjustments; | |||
8261 | const Expr *Inner = | |||
8262 | E->getSubExpr()->skipRValueSubobjectAdjustments(CommaLHSs, Adjustments); | |||
8263 | ||||
8264 | // If we passed any comma operators, evaluate their LHSs. | |||
8265 | for (unsigned I = 0, N = CommaLHSs.size(); I != N; ++I) | |||
8266 | if (!EvaluateIgnoredValue(Info, CommaLHSs[I])) | |||
8267 | return false; | |||
8268 | ||||
8269 | // A materialized temporary with static storage duration can appear within the | |||
8270 | // result of a constant expression evaluation, so we need to preserve its | |||
8271 | // value for use outside this evaluation. | |||
8272 | APValue *Value; | |||
8273 | if (E->getStorageDuration() == SD_Static) { | |||
8274 | // FIXME: What about SD_Thread? | |||
8275 | Value = E->getOrCreateValue(true); | |||
8276 | *Value = APValue(); | |||
8277 | Result.set(E); | |||
8278 | } else { | |||
8279 | Value = &Info.CurrentCall->createTemporary( | |||
8280 | E, E->getType(), | |||
8281 | E->getStorageDuration() == SD_FullExpression ? ScopeKind::FullExpression | |||
8282 | : ScopeKind::Block, | |||
8283 | Result); | |||
8284 | } | |||
8285 | ||||
8286 | QualType Type = Inner->getType(); | |||
8287 | ||||
8288 | // Materialize the temporary itself. | |||
8289 | if (!EvaluateInPlace(*Value, Info, Result, Inner)) { | |||
8290 | *Value = APValue(); | |||
8291 | return false; | |||
8292 | } | |||
8293 | ||||
8294 | // Adjust our lvalue to refer to the desired subobject. | |||
8295 | for (unsigned I = Adjustments.size(); I != 0; /**/) { | |||
8296 | --I; | |||
8297 | switch (Adjustments[I].Kind) { | |||
8298 | case SubobjectAdjustment::DerivedToBaseAdjustment: | |||
8299 | if (!HandleLValueBasePath(Info, Adjustments[I].DerivedToBase.BasePath, | |||
8300 | Type, Result)) | |||
8301 | return false; | |||
8302 | Type = Adjustments[I].DerivedToBase.BasePath->getType(); | |||
8303 | break; | |||
8304 | ||||
8305 | case SubobjectAdjustment::FieldAdjustment: | |||
8306 | if (!HandleLValueMember(Info, E, Result, Adjustments[I].Field)) | |||
8307 | return false; | |||
8308 | Type = Adjustments[I].Field->getType(); | |||
8309 | break; | |||
8310 | ||||
8311 | case SubobjectAdjustment::MemberPointerAdjustment: | |||
8312 | if (!HandleMemberPointerAccess(this->Info, Type, Result, | |||
8313 | Adjustments[I].Ptr.RHS)) | |||
8314 | return false; | |||
8315 | Type = Adjustments[I].Ptr.MPT->getPointeeType(); | |||
8316 | break; | |||
8317 | } | |||
8318 | } | |||
8319 | ||||
8320 | return true; | |||
8321 | } | |||
8322 | ||||
8323 | bool | |||
8324 | LValueExprEvaluator::VisitCompoundLiteralExpr(const CompoundLiteralExpr *E) { | |||
8325 | assert((!Info.getLangOpts().CPlusPlus || E->isFileScope()) &&(static_cast <bool> ((!Info.getLangOpts().CPlusPlus || E ->isFileScope()) && "lvalue compound literal in c++?" ) ? void (0) : __assert_fail ("(!Info.getLangOpts().CPlusPlus || E->isFileScope()) && \"lvalue compound literal in c++?\"" , "clang/lib/AST/ExprConstant.cpp", 8326, __extension__ __PRETTY_FUNCTION__ )) | |||
8326 | "lvalue compound literal in c++?")(static_cast <bool> ((!Info.getLangOpts().CPlusPlus || E ->isFileScope()) && "lvalue compound literal in c++?" ) ? void (0) : __assert_fail ("(!Info.getLangOpts().CPlusPlus || E->isFileScope()) && \"lvalue compound literal in c++?\"" , "clang/lib/AST/ExprConstant.cpp", 8326, __extension__ __PRETTY_FUNCTION__ )); | |||
8327 | // Defer visiting the literal until the lvalue-to-rvalue conversion. We can | |||
8328 | // only see this when folding in C, so there's no standard to follow here. | |||
8329 | return Success(E); | |||
8330 | } | |||
8331 | ||||
8332 | bool LValueExprEvaluator::VisitCXXTypeidExpr(const CXXTypeidExpr *E) { | |||
8333 | TypeInfoLValue TypeInfo; | |||
8334 | ||||
8335 | if (!E->isPotentiallyEvaluated()) { | |||
8336 | if (E->isTypeOperand()) | |||
8337 | TypeInfo = TypeInfoLValue(E->getTypeOperand(Info.Ctx).getTypePtr()); | |||
8338 | else | |||
8339 | TypeInfo = TypeInfoLValue(E->getExprOperand()->getType().getTypePtr()); | |||
8340 | } else { | |||
8341 | if (!Info.Ctx.getLangOpts().CPlusPlus20) { | |||
8342 | Info.CCEDiag(E, diag::note_constexpr_typeid_polymorphic) | |||
8343 | << E->getExprOperand()->getType() | |||
8344 | << E->getExprOperand()->getSourceRange(); | |||
8345 | } | |||
8346 | ||||
8347 | if (!Visit(E->getExprOperand())) | |||
8348 | return false; | |||
8349 | ||||
8350 | Optional<DynamicType> DynType = | |||
8351 | ComputeDynamicType(Info, E, Result, AK_TypeId); | |||
8352 | if (!DynType) | |||
8353 | return false; | |||
8354 | ||||
8355 | TypeInfo = | |||
8356 | TypeInfoLValue(Info.Ctx.getRecordType(DynType->Type).getTypePtr()); | |||
8357 | } | |||
8358 | ||||
8359 | return Success(APValue::LValueBase::getTypeInfo(TypeInfo, E->getType())); | |||
8360 | } | |||
8361 | ||||
8362 | bool LValueExprEvaluator::VisitCXXUuidofExpr(const CXXUuidofExpr *E) { | |||
8363 | return Success(E->getGuidDecl()); | |||
8364 | } | |||
8365 | ||||
8366 | bool LValueExprEvaluator::VisitMemberExpr(const MemberExpr *E) { | |||
8367 | // Handle static data members. | |||
8368 | if (const VarDecl *VD = dyn_cast<VarDecl>(E->getMemberDecl())) { | |||
8369 | VisitIgnoredBaseExpression(E->getBase()); | |||
8370 | return VisitVarDecl(E, VD); | |||
8371 | } | |||
8372 | ||||
8373 | // Handle static member functions. | |||
8374 | if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl())) { | |||
8375 | if (MD->isStatic()) { | |||
8376 | VisitIgnoredBaseExpression(E->getBase()); | |||
8377 | return Success(MD); | |||
8378 | } | |||
8379 | } | |||
8380 | ||||
8381 | // Handle non-static data members. | |||
8382 | return LValueExprEvaluatorBaseTy::VisitMemberExpr(E); | |||
8383 | } | |||
8384 | ||||
8385 | bool LValueExprEvaluator::VisitArraySubscriptExpr(const ArraySubscriptExpr *E) { | |||
8386 | // FIXME: Deal with vectors as array subscript bases. | |||
8387 | if (E->getBase()->getType()->isVectorType()) | |||
8388 | return Error(E); | |||
8389 | ||||
8390 | APSInt Index; | |||
8391 | bool Success = true; | |||
8392 | ||||
8393 | // C++17's rules require us to evaluate the LHS first, regardless of which | |||
8394 | // side is the base. | |||
8395 | for (const Expr *SubExpr : {E->getLHS(), E->getRHS()}) { | |||
8396 | if (SubExpr == E->getBase() ? !evaluatePointer(SubExpr, Result) | |||
8397 | : !EvaluateInteger(SubExpr, Index, Info)) { | |||
8398 | if (!Info.noteFailure()) | |||
8399 | return false; | |||
8400 | Success = false; | |||
8401 | } | |||
8402 | } | |||
8403 | ||||
8404 | return Success && | |||
8405 | HandleLValueArrayAdjustment(Info, E, Result, E->getType(), Index); | |||
8406 | } | |||
8407 | ||||
8408 | bool LValueExprEvaluator::VisitUnaryDeref(const UnaryOperator *E) { | |||
8409 | return evaluatePointer(E->getSubExpr(), Result); | |||
8410 | } | |||
8411 | ||||
8412 | bool LValueExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { | |||
8413 | if (!Visit(E->getSubExpr())) | |||
8414 | return false; | |||
8415 | // __real is a no-op on scalar lvalues. | |||
8416 | if (E->getSubExpr()->getType()->isAnyComplexType()) | |||
8417 | HandleLValueComplexElement(Info, E, Result, E->getType(), false); | |||
8418 | return true; | |||
8419 | } | |||
8420 | ||||
8421 | bool LValueExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { | |||
8422 | assert(E->getSubExpr()->getType()->isAnyComplexType() &&(static_cast <bool> (E->getSubExpr()->getType()-> isAnyComplexType() && "lvalue __imag__ on scalar?") ? void (0) : __assert_fail ("E->getSubExpr()->getType()->isAnyComplexType() && \"lvalue __imag__ on scalar?\"" , "clang/lib/AST/ExprConstant.cpp", 8423, __extension__ __PRETTY_FUNCTION__ )) | |||
8423 | "lvalue __imag__ on scalar?")(static_cast <bool> (E->getSubExpr()->getType()-> isAnyComplexType() && "lvalue __imag__ on scalar?") ? void (0) : __assert_fail ("E->getSubExpr()->getType()->isAnyComplexType() && \"lvalue __imag__ on scalar?\"" , "clang/lib/AST/ExprConstant.cpp", 8423, __extension__ __PRETTY_FUNCTION__ )); | |||
8424 | if (!Visit(E->getSubExpr())) | |||
8425 | return false; | |||
8426 | HandleLValueComplexElement(Info, E, Result, E->getType(), true); | |||
8427 | return true; | |||
8428 | } | |||
8429 | ||||
8430 | bool LValueExprEvaluator::VisitUnaryPreIncDec(const UnaryOperator *UO) { | |||
8431 | if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure()) | |||
8432 | return Error(UO); | |||
8433 | ||||
8434 | if (!this->Visit(UO->getSubExpr())) | |||
8435 | return false; | |||
8436 | ||||
8437 | return handleIncDec( | |||
8438 | this->Info, UO, Result, UO->getSubExpr()->getType(), | |||
8439 | UO->isIncrementOp(), nullptr); | |||
8440 | } | |||
8441 | ||||
8442 | bool LValueExprEvaluator::VisitCompoundAssignOperator( | |||
8443 | const CompoundAssignOperator *CAO) { | |||
8444 | if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure()) | |||
8445 | return Error(CAO); | |||
8446 | ||||
8447 | bool Success = true; | |||
8448 | ||||
8449 | // C++17 onwards require that we evaluate the RHS first. | |||
8450 | APValue RHS; | |||
8451 | if (!Evaluate(RHS, this->Info, CAO->getRHS())) { | |||
8452 | if (!Info.noteFailure()) | |||
8453 | return false; | |||
8454 | Success = false; | |||
8455 | } | |||
8456 | ||||
8457 | // The overall lvalue result is the result of evaluating the LHS. | |||
8458 | if (!this->Visit(CAO->getLHS()) || !Success) | |||
8459 | return false; | |||
8460 | ||||
8461 | return handleCompoundAssignment( | |||
8462 | this->Info, CAO, | |||
8463 | Result, CAO->getLHS()->getType(), CAO->getComputationLHSType(), | |||
8464 | CAO->getOpForCompoundAssignment(CAO->getOpcode()), RHS); | |||
8465 | } | |||
8466 | ||||
8467 | bool LValueExprEvaluator::VisitBinAssign(const BinaryOperator *E) { | |||
8468 | if (!Info.getLangOpts().CPlusPlus14 && !Info.keepEvaluatingAfterFailure()) | |||
8469 | return Error(E); | |||
8470 | ||||
8471 | bool Success = true; | |||
8472 | ||||
8473 | // C++17 onwards require that we evaluate the RHS first. | |||
8474 | APValue NewVal; | |||
8475 | if (!Evaluate(NewVal, this->Info, E->getRHS())) { | |||
8476 | if (!Info.noteFailure()) | |||
8477 | return false; | |||
8478 | Success = false; | |||
8479 | } | |||
8480 | ||||
8481 | if (!this->Visit(E->getLHS()) || !Success) | |||
8482 | return false; | |||
8483 | ||||
8484 | if (Info.getLangOpts().CPlusPlus20 && | |||
8485 | !HandleUnionActiveMemberChange(Info, E->getLHS(), Result)) | |||
8486 | return false; | |||
8487 | ||||
8488 | return handleAssignment(this->Info, E, Result, E->getLHS()->getType(), | |||
8489 | NewVal); | |||
8490 | } | |||
8491 | ||||
8492 | //===----------------------------------------------------------------------===// | |||
8493 | // Pointer Evaluation | |||
8494 | //===----------------------------------------------------------------------===// | |||
8495 | ||||
8496 | /// Attempts to compute the number of bytes available at the pointer | |||
8497 | /// returned by a function with the alloc_size attribute. Returns true if we | |||
8498 | /// were successful. Places an unsigned number into `Result`. | |||
8499 | /// | |||
8500 | /// This expects the given CallExpr to be a call to a function with an | |||
8501 | /// alloc_size attribute. | |||
8502 | static bool getBytesReturnedByAllocSizeCall(const ASTContext &Ctx, | |||
8503 | const CallExpr *Call, | |||
8504 | llvm::APInt &Result) { | |||
8505 | const AllocSizeAttr *AllocSize = getAllocSizeAttr(Call); | |||
8506 | ||||
8507 | assert(AllocSize && AllocSize->getElemSizeParam().isValid())(static_cast <bool> (AllocSize && AllocSize-> getElemSizeParam().isValid()) ? void (0) : __assert_fail ("AllocSize && AllocSize->getElemSizeParam().isValid()" , "clang/lib/AST/ExprConstant.cpp", 8507, __extension__ __PRETTY_FUNCTION__ )); | |||
8508 | unsigned SizeArgNo = AllocSize->getElemSizeParam().getASTIndex(); | |||
8509 | unsigned BitsInSizeT = Ctx.getTypeSize(Ctx.getSizeType()); | |||
8510 | if (Call->getNumArgs() <= SizeArgNo) | |||
8511 | return false; | |||
8512 | ||||
8513 | auto EvaluateAsSizeT = [&](const Expr *E, APSInt &Into) { | |||
8514 | Expr::EvalResult ExprResult; | |||
8515 | if (!E->EvaluateAsInt(ExprResult, Ctx, Expr::SE_AllowSideEffects)) | |||
8516 | return false; | |||
8517 | Into = ExprResult.Val.getInt(); | |||
8518 | if (Into.isNegative() || !Into.isIntN(BitsInSizeT)) | |||
8519 | return false; | |||
8520 | Into = Into.zextOrSelf(BitsInSizeT); | |||
8521 | return true; | |||
8522 | }; | |||
8523 | ||||
8524 | APSInt SizeOfElem; | |||
8525 | if (!EvaluateAsSizeT(Call->getArg(SizeArgNo), SizeOfElem)) | |||
8526 | return false; | |||
8527 | ||||
8528 | if (!AllocSize->getNumElemsParam().isValid()) { | |||
8529 | Result = std::move(SizeOfElem); | |||
8530 | return true; | |||
8531 | } | |||
8532 | ||||
8533 | APSInt NumberOfElems; | |||
8534 | unsigned NumArgNo = AllocSize->getNumElemsParam().getASTIndex(); | |||
8535 | if (!EvaluateAsSizeT(Call->getArg(NumArgNo), NumberOfElems)) | |||
8536 | return false; | |||
8537 | ||||
8538 | bool Overflow; | |||
8539 | llvm::APInt BytesAvailable = SizeOfElem.umul_ov(NumberOfElems, Overflow); | |||
8540 | if (Overflow) | |||
8541 | return false; | |||
8542 | ||||
8543 | Result = std::move(BytesAvailable); | |||
8544 | return true; | |||
8545 | } | |||
8546 | ||||
8547 | /// Convenience function. LVal's base must be a call to an alloc_size | |||
8548 | /// function. | |||
8549 | static bool getBytesReturnedByAllocSizeCall(const ASTContext &Ctx, | |||
8550 | const LValue &LVal, | |||
8551 | llvm::APInt &Result) { | |||
8552 | assert(isBaseAnAllocSizeCall(LVal.getLValueBase()) &&(static_cast <bool> (isBaseAnAllocSizeCall(LVal.getLValueBase ()) && "Can't get the size of a non alloc_size function" ) ? void (0) : __assert_fail ("isBaseAnAllocSizeCall(LVal.getLValueBase()) && \"Can't get the size of a non alloc_size function\"" , "clang/lib/AST/ExprConstant.cpp", 8553, __extension__ __PRETTY_FUNCTION__ )) | |||
8553 | "Can't get the size of a non alloc_size function")(static_cast <bool> (isBaseAnAllocSizeCall(LVal.getLValueBase ()) && "Can't get the size of a non alloc_size function" ) ? void (0) : __assert_fail ("isBaseAnAllocSizeCall(LVal.getLValueBase()) && \"Can't get the size of a non alloc_size function\"" , "clang/lib/AST/ExprConstant.cpp", 8553, __extension__ __PRETTY_FUNCTION__ )); | |||
8554 | const auto *Base = LVal.getLValueBase().get<const Expr *>(); | |||
8555 | const CallExpr *CE = tryUnwrapAllocSizeCall(Base); | |||
8556 | return getBytesReturnedByAllocSizeCall(Ctx, CE, Result); | |||
8557 | } | |||
8558 | ||||
8559 | /// Attempts to evaluate the given LValueBase as the result of a call to | |||
8560 | /// a function with the alloc_size attribute. If it was possible to do so, this | |||
8561 | /// function will return true, make Result's Base point to said function call, | |||
8562 | /// and mark Result's Base as invalid. | |||
8563 | static bool evaluateLValueAsAllocSize(EvalInfo &Info, APValue::LValueBase Base, | |||
8564 | LValue &Result) { | |||
8565 | if (Base.isNull()) | |||
8566 | return false; | |||
8567 | ||||
8568 | // Because we do no form of static analysis, we only support const variables. | |||
8569 | // | |||
8570 | // Additionally, we can't support parameters, nor can we support static | |||
8571 | // variables (in the latter case, use-before-assign isn't UB; in the former, | |||
8572 | // we have no clue what they'll be assigned to). | |||
8573 | const auto *VD = | |||
8574 | dyn_cast_or_null<VarDecl>(Base.dyn_cast<const ValueDecl *>()); | |||
8575 | if (!VD || !VD->isLocalVarDecl() || !VD->getType().isConstQualified()) | |||
8576 | return false; | |||
8577 | ||||
8578 | const Expr *Init = VD->getAnyInitializer(); | |||
8579 | if (!Init) | |||
8580 | return false; | |||
8581 | ||||
8582 | const Expr *E = Init->IgnoreParens(); | |||
8583 | if (!tryUnwrapAllocSizeCall(E)) | |||
8584 | return false; | |||
8585 | ||||
8586 | // Store E instead of E unwrapped so that the type of the LValue's base is | |||
8587 | // what the user wanted. | |||
8588 | Result.setInvalid(E); | |||
8589 | ||||
8590 | QualType Pointee = E->getType()->castAs<PointerType>()->getPointeeType(); | |||
8591 | Result.addUnsizedArray(Info, E, Pointee); | |||
8592 | return true; | |||
8593 | } | |||
8594 | ||||
8595 | namespace { | |||
8596 | class PointerExprEvaluator | |||
8597 | : public ExprEvaluatorBase<PointerExprEvaluator> { | |||
8598 | LValue &Result; | |||
8599 | bool InvalidBaseOK; | |||
8600 | ||||
8601 | bool Success(const Expr *E) { | |||
8602 | Result.set(E); | |||
8603 | return true; | |||
8604 | } | |||
8605 | ||||
8606 | bool evaluateLValue(const Expr *E, LValue &Result) { | |||
8607 | return EvaluateLValue(E, Result, Info, InvalidBaseOK); | |||
8608 | } | |||
8609 | ||||
8610 | bool evaluatePointer(const Expr *E, LValue &Result) { | |||
8611 | return EvaluatePointer(E, Result, Info, InvalidBaseOK); | |||
8612 | } | |||
8613 | ||||
8614 | bool visitNonBuiltinCallExpr(const CallExpr *E); | |||
8615 | public: | |||
8616 | ||||
8617 | PointerExprEvaluator(EvalInfo &info, LValue &Result, bool InvalidBaseOK) | |||
8618 | : ExprEvaluatorBaseTy(info), Result(Result), | |||
8619 | InvalidBaseOK(InvalidBaseOK) {} | |||
8620 | ||||
8621 | bool Success(const APValue &V, const Expr *E) { | |||
8622 | Result.setFrom(Info.Ctx, V); | |||
8623 | return true; | |||
8624 | } | |||
8625 | bool ZeroInitialization(const Expr *E) { | |||
8626 | Result.setNull(Info.Ctx, E->getType()); | |||
8627 | return true; | |||
8628 | } | |||
8629 | ||||
8630 | bool VisitBinaryOperator(const BinaryOperator *E); | |||
8631 | bool VisitCastExpr(const CastExpr* E); | |||
8632 | bool VisitUnaryAddrOf(const UnaryOperator *E); | |||
8633 | bool VisitObjCStringLiteral(const ObjCStringLiteral *E) | |||
8634 | { return Success(E); } | |||
8635 | bool VisitObjCBoxedExpr(const ObjCBoxedExpr *E) { | |||
8636 | if (E->isExpressibleAsConstantInitializer()) | |||
8637 | return Success(E); | |||
8638 | if (Info.noteFailure()) | |||
8639 | EvaluateIgnoredValue(Info, E->getSubExpr()); | |||
8640 | return Error(E); | |||
8641 | } | |||
8642 | bool VisitAddrLabelExpr(const AddrLabelExpr *E) | |||
8643 | { return Success(E); } | |||
8644 | bool VisitCallExpr(const CallExpr *E); | |||
8645 | bool VisitBuiltinCallExpr(const CallExpr *E, unsigned BuiltinOp); | |||
8646 | bool VisitBlockExpr(const BlockExpr *E) { | |||
8647 | if (!E->getBlockDecl()->hasCaptures()) | |||
8648 | return Success(E); | |||
8649 | return Error(E); | |||
8650 | } | |||
8651 | bool VisitCXXThisExpr(const CXXThisExpr *E) { | |||
8652 | // Can't look at 'this' when checking a potential constant expression. | |||
8653 | if (Info.checkingPotentialConstantExpression()) | |||
8654 | return false; | |||
8655 | if (!Info.CurrentCall->This) { | |||
8656 | if (Info.getLangOpts().CPlusPlus11) | |||
8657 | Info.FFDiag(E, diag::note_constexpr_this) << E->isImplicit(); | |||
8658 | else | |||
8659 | Info.FFDiag(E); | |||
8660 | return false; | |||
8661 | } | |||
8662 | Result = *Info.CurrentCall->This; | |||
8663 | // If we are inside a lambda's call operator, the 'this' expression refers | |||
8664 | // to the enclosing '*this' object (either by value or reference) which is | |||
8665 | // either copied into the closure object's field that represents the '*this' | |||
8666 | // or refers to '*this'. | |||
8667 | if (isLambdaCallOperator(Info.CurrentCall->Callee)) { | |||
8668 | // Ensure we actually have captured 'this'. (an error will have | |||
8669 | // been previously reported if not). | |||
8670 | if (!Info.CurrentCall->LambdaThisCaptureField) | |||
8671 | return false; | |||
8672 | ||||
8673 | // Update 'Result' to refer to the data member/field of the closure object | |||
8674 | // that represents the '*this' capture. | |||
8675 | if (!HandleLValueMember(Info, E, Result, | |||
8676 | Info.CurrentCall->LambdaThisCaptureField)) | |||
8677 | return false; | |||
8678 | // If we captured '*this' by reference, replace the field with its referent. | |||
8679 | if (Info.CurrentCall->LambdaThisCaptureField->getType() | |||
8680 | ->isPointerType()) { | |||
8681 | APValue RVal; | |||
8682 | if (!handleLValueToRValueConversion(Info, E, E->getType(), Result, | |||
8683 | RVal)) | |||
8684 | return false; | |||
8685 | ||||
8686 | Result.setFrom(Info.Ctx, RVal); | |||
8687 | } | |||
8688 | } | |||
8689 | return true; | |||
8690 | } | |||
8691 | ||||
8692 | bool VisitCXXNewExpr(const CXXNewExpr *E); | |||
8693 | ||||
8694 | bool VisitSourceLocExpr(const SourceLocExpr *E) { | |||
8695 | assert(E->isStringType() && "SourceLocExpr isn't a pointer type?")(static_cast <bool> (E->isStringType() && "SourceLocExpr isn't a pointer type?" ) ? void (0) : __assert_fail ("E->isStringType() && \"SourceLocExpr isn't a pointer type?\"" , "clang/lib/AST/ExprConstant.cpp", 8695, __extension__ __PRETTY_FUNCTION__ )); | |||
8696 | APValue LValResult = E->EvaluateInContext( | |||
8697 | Info.Ctx, Info.CurrentCall->CurSourceLocExprScope.getDefaultExpr()); | |||
8698 | Result.setFrom(Info.Ctx, LValResult); | |||
8699 | return true; | |||
8700 | } | |||
8701 | ||||
8702 | bool VisitSYCLUniqueStableNameExpr(const SYCLUniqueStableNameExpr *E) { | |||
8703 | std::string ResultStr = E->ComputeName(Info.Ctx); | |||
8704 | ||||
8705 | QualType CharTy = Info.Ctx.CharTy.withConst(); | |||
8706 | APInt Size(Info.Ctx.getTypeSize(Info.Ctx.getSizeType()), | |||
8707 | ResultStr.size() + 1); | |||
8708 | QualType ArrayTy = Info.Ctx.getConstantArrayType(CharTy, Size, nullptr, | |||
8709 | ArrayType::Normal, 0); | |||
8710 | ||||
8711 | StringLiteral *SL = | |||
8712 | StringLiteral::Create(Info.Ctx, ResultStr, StringLiteral::Ascii, | |||
8713 | /*Pascal*/ false, ArrayTy, E->getLocation()); | |||
8714 | ||||
8715 | evaluateLValue(SL, Result); | |||
8716 | Result.addArray(Info, E, cast<ConstantArrayType>(ArrayTy)); | |||
8717 | return true; | |||
8718 | } | |||
8719 | ||||
8720 | // FIXME: Missing: @protocol, @selector | |||
8721 | }; | |||
8722 | } // end anonymous namespace | |||
8723 | ||||
8724 | static bool EvaluatePointer(const Expr* E, LValue& Result, EvalInfo &Info, | |||
8725 | bool InvalidBaseOK) { | |||
8726 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 8726, __extension__ __PRETTY_FUNCTION__)); | |||
8727 | assert(E->isPRValue() && E->getType()->hasPointerRepresentation())(static_cast <bool> (E->isPRValue() && E-> getType()->hasPointerRepresentation()) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->hasPointerRepresentation()" , "clang/lib/AST/ExprConstant.cpp", 8727, __extension__ __PRETTY_FUNCTION__ )); | |||
8728 | return PointerExprEvaluator(Info, Result, InvalidBaseOK).Visit(E); | |||
8729 | } | |||
8730 | ||||
8731 | bool PointerExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | |||
8732 | if (E->getOpcode() != BO_Add && | |||
8733 | E->getOpcode() != BO_Sub) | |||
8734 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | |||
8735 | ||||
8736 | const Expr *PExp = E->getLHS(); | |||
8737 | const Expr *IExp = E->getRHS(); | |||
8738 | if (IExp->getType()->isPointerType()) | |||
8739 | std::swap(PExp, IExp); | |||
8740 | ||||
8741 | bool EvalPtrOK = evaluatePointer(PExp, Result); | |||
8742 | if (!EvalPtrOK && !Info.noteFailure()) | |||
8743 | return false; | |||
8744 | ||||
8745 | llvm::APSInt Offset; | |||
8746 | if (!EvaluateInteger(IExp, Offset, Info) || !EvalPtrOK) | |||
8747 | return false; | |||
8748 | ||||
8749 | if (E->getOpcode() == BO_Sub) | |||
8750 | negateAsSigned(Offset); | |||
8751 | ||||
8752 | QualType Pointee = PExp->getType()->castAs<PointerType>()->getPointeeType(); | |||
8753 | return HandleLValueArrayAdjustment(Info, E, Result, Pointee, Offset); | |||
8754 | } | |||
8755 | ||||
8756 | bool PointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { | |||
8757 | return evaluateLValue(E->getSubExpr(), Result); | |||
8758 | } | |||
8759 | ||||
8760 | bool PointerExprEvaluator::VisitCastExpr(const CastExpr *E) { | |||
8761 | const Expr *SubExpr = E->getSubExpr(); | |||
8762 | ||||
8763 | switch (E->getCastKind()) { | |||
8764 | default: | |||
8765 | break; | |||
8766 | case CK_BitCast: | |||
8767 | case CK_CPointerToObjCPointerCast: | |||
8768 | case CK_BlockPointerToObjCPointerCast: | |||
8769 | case CK_AnyPointerToBlockPointerCast: | |||
8770 | case CK_AddressSpaceConversion: | |||
8771 | if (!Visit(SubExpr)) | |||
8772 | return false; | |||
8773 | // Bitcasts to cv void* are static_casts, not reinterpret_casts, so are | |||
8774 | // permitted in constant expressions in C++11. Bitcasts from cv void* are | |||
8775 | // also static_casts, but we disallow them as a resolution to DR1312. | |||
8776 | if (!E->getType()->isVoidPointerType()) { | |||
8777 | if (!Result.InvalidBase && !Result.Designator.Invalid && | |||
8778 | !Result.IsNullPtr && | |||
8779 | Info.Ctx.hasSameUnqualifiedType(Result.Designator.getType(Info.Ctx), | |||
8780 | E->getType()->getPointeeType()) && | |||
8781 | Info.getStdAllocatorCaller("allocate")) { | |||
8782 | // Inside a call to std::allocator::allocate and friends, we permit | |||
8783 | // casting from void* back to cv1 T* for a pointer that points to a | |||
8784 | // cv2 T. | |||
8785 | } else { | |||
8786 | Result.Designator.setInvalid(); | |||
8787 | if (SubExpr->getType()->isVoidPointerType()) | |||
8788 | CCEDiag(E, diag::note_constexpr_invalid_cast) | |||
8789 | << 3 << SubExpr->getType(); | |||
8790 | else | |||
8791 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; | |||
8792 | } | |||
8793 | } | |||
8794 | if (E->getCastKind() == CK_AddressSpaceConversion && Result.IsNullPtr) | |||
8795 | ZeroInitialization(E); | |||
8796 | return true; | |||
8797 | ||||
8798 | case CK_DerivedToBase: | |||
8799 | case CK_UncheckedDerivedToBase: | |||
8800 | if (!evaluatePointer(E->getSubExpr(), Result)) | |||
8801 | return false; | |||
8802 | if (!Result.Base && Result.Offset.isZero()) | |||
8803 | return true; | |||
8804 | ||||
8805 | // Now figure out the necessary offset to add to the base LV to get from | |||
8806 | // the derived class to the base class. | |||
8807 | return HandleLValueBasePath(Info, E, E->getSubExpr()->getType()-> | |||
8808 | castAs<PointerType>()->getPointeeType(), | |||
8809 | Result); | |||
8810 | ||||
8811 | case CK_BaseToDerived: | |||
8812 | if (!Visit(E->getSubExpr())) | |||
8813 | return false; | |||
8814 | if (!Result.Base && Result.Offset.isZero()) | |||
8815 | return true; | |||
8816 | return HandleBaseToDerivedCast(Info, E, Result); | |||
8817 | ||||
8818 | case CK_Dynamic: | |||
8819 | if (!Visit(E->getSubExpr())) | |||
8820 | return false; | |||
8821 | return HandleDynamicCast(Info, cast<ExplicitCastExpr>(E), Result); | |||
8822 | ||||
8823 | case CK_NullToPointer: | |||
8824 | VisitIgnoredValue(E->getSubExpr()); | |||
8825 | return ZeroInitialization(E); | |||
8826 | ||||
8827 | case CK_IntegralToPointer: { | |||
8828 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; | |||
8829 | ||||
8830 | APValue Value; | |||
8831 | if (!EvaluateIntegerOrLValue(SubExpr, Value, Info)) | |||
8832 | break; | |||
8833 | ||||
8834 | if (Value.isInt()) { | |||
8835 | unsigned Size = Info.Ctx.getTypeSize(E->getType()); | |||
8836 | uint64_t N = Value.getInt().extOrTrunc(Size).getZExtValue(); | |||
8837 | Result.Base = (Expr*)nullptr; | |||
8838 | Result.InvalidBase = false; | |||
8839 | Result.Offset = CharUnits::fromQuantity(N); | |||
8840 | Result.Designator.setInvalid(); | |||
8841 | Result.IsNullPtr = false; | |||
8842 | return true; | |||
8843 | } else { | |||
8844 | // Cast is of an lvalue, no need to change value. | |||
8845 | Result.setFrom(Info.Ctx, Value); | |||
8846 | return true; | |||
8847 | } | |||
8848 | } | |||
8849 | ||||
8850 | case CK_ArrayToPointerDecay: { | |||
8851 | if (SubExpr->isGLValue()) { | |||
8852 | if (!evaluateLValue(SubExpr, Result)) | |||
8853 | return false; | |||
8854 | } else { | |||
8855 | APValue &Value = Info.CurrentCall->createTemporary( | |||
8856 | SubExpr, SubExpr->getType(), ScopeKind::FullExpression, Result); | |||
8857 | if (!EvaluateInPlace(Value, Info, Result, SubExpr)) | |||
8858 | return false; | |||
8859 | } | |||
8860 | // The result is a pointer to the first element of the array. | |||
8861 | auto *AT = Info.Ctx.getAsArrayType(SubExpr->getType()); | |||
8862 | if (auto *CAT = dyn_cast<ConstantArrayType>(AT)) | |||
8863 | Result.addArray(Info, E, CAT); | |||
8864 | else | |||
8865 | Result.addUnsizedArray(Info, E, AT->getElementType()); | |||
8866 | return true; | |||
8867 | } | |||
8868 | ||||
8869 | case CK_FunctionToPointerDecay: | |||
8870 | return evaluateLValue(SubExpr, Result); | |||
8871 | ||||
8872 | case CK_LValueToRValue: { | |||
8873 | LValue LVal; | |||
8874 | if (!evaluateLValue(E->getSubExpr(), LVal)) | |||
8875 | return false; | |||
8876 | ||||
8877 | APValue RVal; | |||
8878 | // Note, we use the subexpression's type in order to retain cv-qualifiers. | |||
8879 | if (!handleLValueToRValueConversion(Info, E, E->getSubExpr()->getType(), | |||
8880 | LVal, RVal)) | |||
8881 | return InvalidBaseOK && | |||
8882 | evaluateLValueAsAllocSize(Info, LVal.Base, Result); | |||
8883 | return Success(RVal, E); | |||
8884 | } | |||
8885 | } | |||
8886 | ||||
8887 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
8888 | } | |||
8889 | ||||
8890 | static CharUnits GetAlignOfType(EvalInfo &Info, QualType T, | |||
8891 | UnaryExprOrTypeTrait ExprKind) { | |||
8892 | // C++ [expr.alignof]p3: | |||
8893 | // When alignof is applied to a reference type, the result is the | |||
8894 | // alignment of the referenced type. | |||
8895 | if (const ReferenceType *Ref = T->getAs<ReferenceType>()) | |||
8896 | T = Ref->getPointeeType(); | |||
8897 | ||||
8898 | if (T.getQualifiers().hasUnaligned()) | |||
8899 | return CharUnits::One(); | |||
8900 | ||||
8901 | const bool AlignOfReturnsPreferred = | |||
8902 | Info.Ctx.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver7; | |||
8903 | ||||
8904 | // __alignof is defined to return the preferred alignment. | |||
8905 | // Before 8, clang returned the preferred alignment for alignof and _Alignof | |||
8906 | // as well. | |||
8907 | if (ExprKind == UETT_PreferredAlignOf || AlignOfReturnsPreferred) | |||
8908 | return Info.Ctx.toCharUnitsFromBits( | |||
8909 | Info.Ctx.getPreferredTypeAlign(T.getTypePtr())); | |||
8910 | // alignof and _Alignof are defined to return the ABI alignment. | |||
8911 | else if (ExprKind == UETT_AlignOf) | |||
8912 | return Info.Ctx.getTypeAlignInChars(T.getTypePtr()); | |||
8913 | else | |||
8914 | llvm_unreachable("GetAlignOfType on a non-alignment ExprKind")::llvm::llvm_unreachable_internal("GetAlignOfType on a non-alignment ExprKind" , "clang/lib/AST/ExprConstant.cpp", 8914); | |||
8915 | } | |||
8916 | ||||
8917 | static CharUnits GetAlignOfExpr(EvalInfo &Info, const Expr *E, | |||
8918 | UnaryExprOrTypeTrait ExprKind) { | |||
8919 | E = E->IgnoreParens(); | |||
8920 | ||||
8921 | // The kinds of expressions that we have special-case logic here for | |||
8922 | // should be kept up to date with the special checks for those | |||
8923 | // expressions in Sema. | |||
8924 | ||||
8925 | // alignof decl is always accepted, even if it doesn't make sense: we default | |||
8926 | // to 1 in those cases. | |||
8927 | if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) | |||
8928 | return Info.Ctx.getDeclAlign(DRE->getDecl(), | |||
8929 | /*RefAsPointee*/true); | |||
8930 | ||||
8931 | if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) | |||
8932 | return Info.Ctx.getDeclAlign(ME->getMemberDecl(), | |||
8933 | /*RefAsPointee*/true); | |||
8934 | ||||
8935 | return GetAlignOfType(Info, E->getType(), ExprKind); | |||
8936 | } | |||
8937 | ||||
8938 | static CharUnits getBaseAlignment(EvalInfo &Info, const LValue &Value) { | |||
8939 | if (const auto *VD = Value.Base.dyn_cast<const ValueDecl *>()) | |||
8940 | return Info.Ctx.getDeclAlign(VD); | |||
8941 | if (const auto *E = Value.Base.dyn_cast<const Expr *>()) | |||
8942 | return GetAlignOfExpr(Info, E, UETT_AlignOf); | |||
8943 | return GetAlignOfType(Info, Value.Base.getTypeInfoType(), UETT_AlignOf); | |||
8944 | } | |||
8945 | ||||
8946 | /// Evaluate the value of the alignment argument to __builtin_align_{up,down}, | |||
8947 | /// __builtin_is_aligned and __builtin_assume_aligned. | |||
8948 | static bool getAlignmentArgument(const Expr *E, QualType ForType, | |||
8949 | EvalInfo &Info, APSInt &Alignment) { | |||
8950 | if (!EvaluateInteger(E, Alignment, Info)) | |||
8951 | return false; | |||
8952 | if (Alignment < 0 || !Alignment.isPowerOf2()) { | |||
8953 | Info.FFDiag(E, diag::note_constexpr_invalid_alignment) << Alignment; | |||
8954 | return false; | |||
8955 | } | |||
8956 | unsigned SrcWidth = Info.Ctx.getIntWidth(ForType); | |||
8957 | APSInt MaxValue(APInt::getOneBitSet(SrcWidth, SrcWidth - 1)); | |||
8958 | if (APSInt::compareValues(Alignment, MaxValue) > 0) { | |||
8959 | Info.FFDiag(E, diag::note_constexpr_alignment_too_big) | |||
8960 | << MaxValue << ForType << Alignment; | |||
8961 | return false; | |||
8962 | } | |||
8963 | // Ensure both alignment and source value have the same bit width so that we | |||
8964 | // don't assert when computing the resulting value. | |||
8965 | APSInt ExtAlignment = | |||
8966 | APSInt(Alignment.zextOrTrunc(SrcWidth), /*isUnsigned=*/true); | |||
8967 | assert(APSInt::compareValues(Alignment, ExtAlignment) == 0 &&(static_cast <bool> (APSInt::compareValues(Alignment, ExtAlignment ) == 0 && "Alignment should not be changed by ext/trunc" ) ? void (0) : __assert_fail ("APSInt::compareValues(Alignment, ExtAlignment) == 0 && \"Alignment should not be changed by ext/trunc\"" , "clang/lib/AST/ExprConstant.cpp", 8968, __extension__ __PRETTY_FUNCTION__ )) | |||
8968 | "Alignment should not be changed by ext/trunc")(static_cast <bool> (APSInt::compareValues(Alignment, ExtAlignment ) == 0 && "Alignment should not be changed by ext/trunc" ) ? void (0) : __assert_fail ("APSInt::compareValues(Alignment, ExtAlignment) == 0 && \"Alignment should not be changed by ext/trunc\"" , "clang/lib/AST/ExprConstant.cpp", 8968, __extension__ __PRETTY_FUNCTION__ )); | |||
8969 | Alignment = ExtAlignment; | |||
8970 | assert(Alignment.getBitWidth() == SrcWidth)(static_cast <bool> (Alignment.getBitWidth() == SrcWidth ) ? void (0) : __assert_fail ("Alignment.getBitWidth() == SrcWidth" , "clang/lib/AST/ExprConstant.cpp", 8970, __extension__ __PRETTY_FUNCTION__ )); | |||
8971 | return true; | |||
8972 | } | |||
8973 | ||||
8974 | // To be clear: this happily visits unsupported builtins. Better name welcomed. | |||
8975 | bool PointerExprEvaluator::visitNonBuiltinCallExpr(const CallExpr *E) { | |||
8976 | if (ExprEvaluatorBaseTy::VisitCallExpr(E)) | |||
8977 | return true; | |||
8978 | ||||
8979 | if (!(InvalidBaseOK && getAllocSizeAttr(E))) | |||
8980 | return false; | |||
8981 | ||||
8982 | Result.setInvalid(E); | |||
8983 | QualType PointeeTy = E->getType()->castAs<PointerType>()->getPointeeType(); | |||
8984 | Result.addUnsizedArray(Info, E, PointeeTy); | |||
8985 | return true; | |||
8986 | } | |||
8987 | ||||
8988 | bool PointerExprEvaluator::VisitCallExpr(const CallExpr *E) { | |||
8989 | if (IsConstantCall(E)) | |||
8990 | return Success(E); | |||
8991 | ||||
8992 | if (unsigned BuiltinOp = E->getBuiltinCallee()) | |||
8993 | return VisitBuiltinCallExpr(E, BuiltinOp); | |||
8994 | ||||
8995 | return visitNonBuiltinCallExpr(E); | |||
8996 | } | |||
8997 | ||||
8998 | // Determine if T is a character type for which we guarantee that | |||
8999 | // sizeof(T) == 1. | |||
9000 | static bool isOneByteCharacterType(QualType T) { | |||
9001 | return T->isCharType() || T->isChar8Type(); | |||
9002 | } | |||
9003 | ||||
9004 | bool PointerExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E, | |||
9005 | unsigned BuiltinOp) { | |||
9006 | switch (BuiltinOp) { | |||
9007 | case Builtin::BI__builtin_addressof: | |||
9008 | return evaluateLValue(E->getArg(0), Result); | |||
9009 | case Builtin::BI__builtin_assume_aligned: { | |||
9010 | // We need to be very careful here because: if the pointer does not have the | |||
9011 | // asserted alignment, then the behavior is undefined, and undefined | |||
9012 | // behavior is non-constant. | |||
9013 | if (!evaluatePointer(E->getArg(0), Result)) | |||
9014 | return false; | |||
9015 | ||||
9016 | LValue OffsetResult(Result); | |||
9017 | APSInt Alignment; | |||
9018 | if (!getAlignmentArgument(E->getArg(1), E->getArg(0)->getType(), Info, | |||
9019 | Alignment)) | |||
9020 | return false; | |||
9021 | CharUnits Align = CharUnits::fromQuantity(Alignment.getZExtValue()); | |||
9022 | ||||
9023 | if (E->getNumArgs() > 2) { | |||
9024 | APSInt Offset; | |||
9025 | if (!EvaluateInteger(E->getArg(2), Offset, Info)) | |||
9026 | return false; | |||
9027 | ||||
9028 | int64_t AdditionalOffset = -Offset.getZExtValue(); | |||
9029 | OffsetResult.Offset += CharUnits::fromQuantity(AdditionalOffset); | |||
9030 | } | |||
9031 | ||||
9032 | // If there is a base object, then it must have the correct alignment. | |||
9033 | if (OffsetResult.Base) { | |||
9034 | CharUnits BaseAlignment = getBaseAlignment(Info, OffsetResult); | |||
9035 | ||||
9036 | if (BaseAlignment < Align) { | |||
9037 | Result.Designator.setInvalid(); | |||
9038 | // FIXME: Add support to Diagnostic for long / long long. | |||
9039 | CCEDiag(E->getArg(0), | |||
9040 | diag::note_constexpr_baa_insufficient_alignment) << 0 | |||
9041 | << (unsigned)BaseAlignment.getQuantity() | |||
9042 | << (unsigned)Align.getQuantity(); | |||
9043 | return false; | |||
9044 | } | |||
9045 | } | |||
9046 | ||||
9047 | // The offset must also have the correct alignment. | |||
9048 | if (OffsetResult.Offset.alignTo(Align) != OffsetResult.Offset) { | |||
9049 | Result.Designator.setInvalid(); | |||
9050 | ||||
9051 | (OffsetResult.Base | |||
9052 | ? CCEDiag(E->getArg(0), | |||
9053 | diag::note_constexpr_baa_insufficient_alignment) << 1 | |||
9054 | : CCEDiag(E->getArg(0), | |||
9055 | diag::note_constexpr_baa_value_insufficient_alignment)) | |||
9056 | << (int)OffsetResult.Offset.getQuantity() | |||
9057 | << (unsigned)Align.getQuantity(); | |||
9058 | return false; | |||
9059 | } | |||
9060 | ||||
9061 | return true; | |||
9062 | } | |||
9063 | case Builtin::BI__builtin_align_up: | |||
9064 | case Builtin::BI__builtin_align_down: { | |||
9065 | if (!evaluatePointer(E->getArg(0), Result)) | |||
9066 | return false; | |||
9067 | APSInt Alignment; | |||
9068 | if (!getAlignmentArgument(E->getArg(1), E->getArg(0)->getType(), Info, | |||
9069 | Alignment)) | |||
9070 | return false; | |||
9071 | CharUnits BaseAlignment = getBaseAlignment(Info, Result); | |||
9072 | CharUnits PtrAlign = BaseAlignment.alignmentAtOffset(Result.Offset); | |||
9073 | // For align_up/align_down, we can return the same value if the alignment | |||
9074 | // is known to be greater or equal to the requested value. | |||
9075 | if (PtrAlign.getQuantity() >= Alignment) | |||
9076 | return true; | |||
9077 | ||||
9078 | // The alignment could be greater than the minimum at run-time, so we cannot | |||
9079 | // infer much about the resulting pointer value. One case is possible: | |||
9080 | // For `_Alignas(32) char buf[N]; __builtin_align_down(&buf[idx], 32)` we | |||
9081 | // can infer the correct index if the requested alignment is smaller than | |||
9082 | // the base alignment so we can perform the computation on the offset. | |||
9083 | if (BaseAlignment.getQuantity() >= Alignment) { | |||
9084 | assert(Alignment.getBitWidth() <= 64 &&(static_cast <bool> (Alignment.getBitWidth() <= 64 && "Cannot handle > 64-bit address-space") ? void (0) : __assert_fail ("Alignment.getBitWidth() <= 64 && \"Cannot handle > 64-bit address-space\"" , "clang/lib/AST/ExprConstant.cpp", 9085, __extension__ __PRETTY_FUNCTION__ )) | |||
9085 | "Cannot handle > 64-bit address-space")(static_cast <bool> (Alignment.getBitWidth() <= 64 && "Cannot handle > 64-bit address-space") ? void (0) : __assert_fail ("Alignment.getBitWidth() <= 64 && \"Cannot handle > 64-bit address-space\"" , "clang/lib/AST/ExprConstant.cpp", 9085, __extension__ __PRETTY_FUNCTION__ )); | |||
9086 | uint64_t Alignment64 = Alignment.getZExtValue(); | |||
9087 | CharUnits NewOffset = CharUnits::fromQuantity( | |||
9088 | BuiltinOp == Builtin::BI__builtin_align_down | |||
9089 | ? llvm::alignDown(Result.Offset.getQuantity(), Alignment64) | |||
9090 | : llvm::alignTo(Result.Offset.getQuantity(), Alignment64)); | |||
9091 | Result.adjustOffset(NewOffset - Result.Offset); | |||
9092 | // TODO: diagnose out-of-bounds values/only allow for arrays? | |||
9093 | return true; | |||
9094 | } | |||
9095 | // Otherwise, we cannot constant-evaluate the result. | |||
9096 | Info.FFDiag(E->getArg(0), diag::note_constexpr_alignment_adjust) | |||
9097 | << Alignment; | |||
9098 | return false; | |||
9099 | } | |||
9100 | case Builtin::BI__builtin_operator_new: | |||
9101 | return HandleOperatorNewCall(Info, E, Result); | |||
9102 | case Builtin::BI__builtin_launder: | |||
9103 | return evaluatePointer(E->getArg(0), Result); | |||
9104 | case Builtin::BIstrchr: | |||
9105 | case Builtin::BIwcschr: | |||
9106 | case Builtin::BImemchr: | |||
9107 | case Builtin::BIwmemchr: | |||
9108 | if (Info.getLangOpts().CPlusPlus11) | |||
9109 | Info.CCEDiag(E, diag::note_constexpr_invalid_function) | |||
9110 | << /*isConstexpr*/0 << /*isConstructor*/0 | |||
9111 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'"); | |||
9112 | else | |||
9113 | Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
9114 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
9115 | case Builtin::BI__builtin_strchr: | |||
9116 | case Builtin::BI__builtin_wcschr: | |||
9117 | case Builtin::BI__builtin_memchr: | |||
9118 | case Builtin::BI__builtin_char_memchr: | |||
9119 | case Builtin::BI__builtin_wmemchr: { | |||
9120 | if (!Visit(E->getArg(0))) | |||
9121 | return false; | |||
9122 | APSInt Desired; | |||
9123 | if (!EvaluateInteger(E->getArg(1), Desired, Info)) | |||
9124 | return false; | |||
9125 | uint64_t MaxLength = uint64_t(-1); | |||
9126 | if (BuiltinOp != Builtin::BIstrchr && | |||
9127 | BuiltinOp != Builtin::BIwcschr && | |||
9128 | BuiltinOp != Builtin::BI__builtin_strchr && | |||
9129 | BuiltinOp != Builtin::BI__builtin_wcschr) { | |||
9130 | APSInt N; | |||
9131 | if (!EvaluateInteger(E->getArg(2), N, Info)) | |||
9132 | return false; | |||
9133 | MaxLength = N.getExtValue(); | |||
9134 | } | |||
9135 | // We cannot find the value if there are no candidates to match against. | |||
9136 | if (MaxLength == 0u) | |||
9137 | return ZeroInitialization(E); | |||
9138 | if (!Result.checkNullPointerForFoldAccess(Info, E, AK_Read) || | |||
9139 | Result.Designator.Invalid) | |||
9140 | return false; | |||
9141 | QualType CharTy = Result.Designator.getType(Info.Ctx); | |||
9142 | bool IsRawByte = BuiltinOp == Builtin::BImemchr || | |||
9143 | BuiltinOp == Builtin::BI__builtin_memchr; | |||
9144 | assert(IsRawByte ||(static_cast <bool> (IsRawByte || Info.Ctx.hasSameUnqualifiedType ( CharTy, E->getArg(0)->getType()->getPointeeType()) ) ? void (0) : __assert_fail ("IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->getArg(0)->getType()->getPointeeType())" , "clang/lib/AST/ExprConstant.cpp", 9146, __extension__ __PRETTY_FUNCTION__ )) | |||
9145 | Info.Ctx.hasSameUnqualifiedType((static_cast <bool> (IsRawByte || Info.Ctx.hasSameUnqualifiedType ( CharTy, E->getArg(0)->getType()->getPointeeType()) ) ? void (0) : __assert_fail ("IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->getArg(0)->getType()->getPointeeType())" , "clang/lib/AST/ExprConstant.cpp", 9146, __extension__ __PRETTY_FUNCTION__ )) | |||
9146 | CharTy, E->getArg(0)->getType()->getPointeeType()))(static_cast <bool> (IsRawByte || Info.Ctx.hasSameUnqualifiedType ( CharTy, E->getArg(0)->getType()->getPointeeType()) ) ? void (0) : __assert_fail ("IsRawByte || Info.Ctx.hasSameUnqualifiedType( CharTy, E->getArg(0)->getType()->getPointeeType())" , "clang/lib/AST/ExprConstant.cpp", 9146, __extension__ __PRETTY_FUNCTION__ )); | |||
9147 | // Pointers to const void may point to objects of incomplete type. | |||
9148 | if (IsRawByte && CharTy->isIncompleteType()) { | |||
9149 | Info.FFDiag(E, diag::note_constexpr_ltor_incomplete_type) << CharTy; | |||
9150 | return false; | |||
9151 | } | |||
9152 | // Give up on byte-oriented matching against multibyte elements. | |||
9153 | // FIXME: We can compare the bytes in the correct order. | |||
9154 | if (IsRawByte && !isOneByteCharacterType(CharTy)) { | |||
9155 | Info.FFDiag(E, diag::note_constexpr_memchr_unsupported) | |||
9156 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'") | |||
9157 | << CharTy; | |||
9158 | return false; | |||
9159 | } | |||
9160 | // Figure out what value we're actually looking for (after converting to | |||
9161 | // the corresponding unsigned type if necessary). | |||
9162 | uint64_t DesiredVal; | |||
9163 | bool StopAtNull = false; | |||
9164 | switch (BuiltinOp) { | |||
9165 | case Builtin::BIstrchr: | |||
9166 | case Builtin::BI__builtin_strchr: | |||
9167 | // strchr compares directly to the passed integer, and therefore | |||
9168 | // always fails if given an int that is not a char. | |||
9169 | if (!APSInt::isSameValue(HandleIntToIntCast(Info, E, CharTy, | |||
9170 | E->getArg(1)->getType(), | |||
9171 | Desired), | |||
9172 | Desired)) | |||
9173 | return ZeroInitialization(E); | |||
9174 | StopAtNull = true; | |||
9175 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
9176 | case Builtin::BImemchr: | |||
9177 | case Builtin::BI__builtin_memchr: | |||
9178 | case Builtin::BI__builtin_char_memchr: | |||
9179 | // memchr compares by converting both sides to unsigned char. That's also | |||
9180 | // correct for strchr if we get this far (to cope with plain char being | |||
9181 | // unsigned in the strchr case). | |||
9182 | DesiredVal = Desired.trunc(Info.Ctx.getCharWidth()).getZExtValue(); | |||
9183 | break; | |||
9184 | ||||
9185 | case Builtin::BIwcschr: | |||
9186 | case Builtin::BI__builtin_wcschr: | |||
9187 | StopAtNull = true; | |||
9188 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
9189 | case Builtin::BIwmemchr: | |||
9190 | case Builtin::BI__builtin_wmemchr: | |||
9191 | // wcschr and wmemchr are given a wchar_t to look for. Just use it. | |||
9192 | DesiredVal = Desired.getZExtValue(); | |||
9193 | break; | |||
9194 | } | |||
9195 | ||||
9196 | for (; MaxLength; --MaxLength) { | |||
9197 | APValue Char; | |||
9198 | if (!handleLValueToRValueConversion(Info, E, CharTy, Result, Char) || | |||
9199 | !Char.isInt()) | |||
9200 | return false; | |||
9201 | if (Char.getInt().getZExtValue() == DesiredVal) | |||
9202 | return true; | |||
9203 | if (StopAtNull && !Char.getInt()) | |||
9204 | break; | |||
9205 | if (!HandleLValueArrayAdjustment(Info, E, Result, CharTy, 1)) | |||
9206 | return false; | |||
9207 | } | |||
9208 | // Not found: return nullptr. | |||
9209 | return ZeroInitialization(E); | |||
9210 | } | |||
9211 | ||||
9212 | case Builtin::BImemcpy: | |||
9213 | case Builtin::BImemmove: | |||
9214 | case Builtin::BIwmemcpy: | |||
9215 | case Builtin::BIwmemmove: | |||
9216 | if (Info.getLangOpts().CPlusPlus11) | |||
9217 | Info.CCEDiag(E, diag::note_constexpr_invalid_function) | |||
9218 | << /*isConstexpr*/0 << /*isConstructor*/0 | |||
9219 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'"); | |||
9220 | else | |||
9221 | Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
9222 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
9223 | case Builtin::BI__builtin_memcpy: | |||
9224 | case Builtin::BI__builtin_memmove: | |||
9225 | case Builtin::BI__builtin_wmemcpy: | |||
9226 | case Builtin::BI__builtin_wmemmove: { | |||
9227 | bool WChar = BuiltinOp == Builtin::BIwmemcpy || | |||
9228 | BuiltinOp == Builtin::BIwmemmove || | |||
9229 | BuiltinOp == Builtin::BI__builtin_wmemcpy || | |||
9230 | BuiltinOp == Builtin::BI__builtin_wmemmove; | |||
9231 | bool Move = BuiltinOp == Builtin::BImemmove || | |||
9232 | BuiltinOp == Builtin::BIwmemmove || | |||
9233 | BuiltinOp == Builtin::BI__builtin_memmove || | |||
9234 | BuiltinOp == Builtin::BI__builtin_wmemmove; | |||
9235 | ||||
9236 | // The result of mem* is the first argument. | |||
9237 | if (!Visit(E->getArg(0))) | |||
9238 | return false; | |||
9239 | LValue Dest = Result; | |||
9240 | ||||
9241 | LValue Src; | |||
9242 | if (!EvaluatePointer(E->getArg(1), Src, Info)) | |||
9243 | return false; | |||
9244 | ||||
9245 | APSInt N; | |||
9246 | if (!EvaluateInteger(E->getArg(2), N, Info)) | |||
9247 | return false; | |||
9248 | assert(!N.isSigned() && "memcpy and friends take an unsigned size")(static_cast <bool> (!N.isSigned() && "memcpy and friends take an unsigned size" ) ? void (0) : __assert_fail ("!N.isSigned() && \"memcpy and friends take an unsigned size\"" , "clang/lib/AST/ExprConstant.cpp", 9248, __extension__ __PRETTY_FUNCTION__ )); | |||
9249 | ||||
9250 | // If the size is zero, we treat this as always being a valid no-op. | |||
9251 | // (Even if one of the src and dest pointers is null.) | |||
9252 | if (!N) | |||
9253 | return true; | |||
9254 | ||||
9255 | // Otherwise, if either of the operands is null, we can't proceed. Don't | |||
9256 | // try to determine the type of the copied objects, because there aren't | |||
9257 | // any. | |||
9258 | if (!Src.Base || !Dest.Base) { | |||
9259 | APValue Val; | |||
9260 | (!Src.Base ? Src : Dest).moveInto(Val); | |||
9261 | Info.FFDiag(E, diag::note_constexpr_memcpy_null) | |||
9262 | << Move << WChar << !!Src.Base | |||
9263 | << Val.getAsString(Info.Ctx, E->getArg(0)->getType()); | |||
9264 | return false; | |||
9265 | } | |||
9266 | if (Src.Designator.Invalid || Dest.Designator.Invalid) | |||
9267 | return false; | |||
9268 | ||||
9269 | // We require that Src and Dest are both pointers to arrays of | |||
9270 | // trivially-copyable type. (For the wide version, the designator will be | |||
9271 | // invalid if the designated object is not a wchar_t.) | |||
9272 | QualType T = Dest.Designator.getType(Info.Ctx); | |||
9273 | QualType SrcT = Src.Designator.getType(Info.Ctx); | |||
9274 | if (!Info.Ctx.hasSameUnqualifiedType(T, SrcT)) { | |||
9275 | // FIXME: Consider using our bit_cast implementation to support this. | |||
9276 | Info.FFDiag(E, diag::note_constexpr_memcpy_type_pun) << Move << SrcT << T; | |||
9277 | return false; | |||
9278 | } | |||
9279 | if (T->isIncompleteType()) { | |||
9280 | Info.FFDiag(E, diag::note_constexpr_memcpy_incomplete_type) << Move << T; | |||
9281 | return false; | |||
9282 | } | |||
9283 | if (!T.isTriviallyCopyableType(Info.Ctx)) { | |||
9284 | Info.FFDiag(E, diag::note_constexpr_memcpy_nontrivial) << Move << T; | |||
9285 | return false; | |||
9286 | } | |||
9287 | ||||
9288 | // Figure out how many T's we're copying. | |||
9289 | uint64_t TSize = Info.Ctx.getTypeSizeInChars(T).getQuantity(); | |||
9290 | if (!WChar) { | |||
9291 | uint64_t Remainder; | |||
9292 | llvm::APInt OrigN = N; | |||
9293 | llvm::APInt::udivrem(OrigN, TSize, N, Remainder); | |||
9294 | if (Remainder) { | |||
9295 | Info.FFDiag(E, diag::note_constexpr_memcpy_unsupported) | |||
9296 | << Move << WChar << 0 << T << toString(OrigN, 10, /*Signed*/false) | |||
9297 | << (unsigned)TSize; | |||
9298 | return false; | |||
9299 | } | |||
9300 | } | |||
9301 | ||||
9302 | // Check that the copying will remain within the arrays, just so that we | |||
9303 | // can give a more meaningful diagnostic. This implicitly also checks that | |||
9304 | // N fits into 64 bits. | |||
9305 | uint64_t RemainingSrcSize = Src.Designator.validIndexAdjustments().second; | |||
9306 | uint64_t RemainingDestSize = Dest.Designator.validIndexAdjustments().second; | |||
9307 | if (N.ugt(RemainingSrcSize) || N.ugt(RemainingDestSize)) { | |||
9308 | Info.FFDiag(E, diag::note_constexpr_memcpy_unsupported) | |||
9309 | << Move << WChar << (N.ugt(RemainingSrcSize) ? 1 : 2) << T | |||
9310 | << toString(N, 10, /*Signed*/false); | |||
9311 | return false; | |||
9312 | } | |||
9313 | uint64_t NElems = N.getZExtValue(); | |||
9314 | uint64_t NBytes = NElems * TSize; | |||
9315 | ||||
9316 | // Check for overlap. | |||
9317 | int Direction = 1; | |||
9318 | if (HasSameBase(Src, Dest)) { | |||
9319 | uint64_t SrcOffset = Src.getLValueOffset().getQuantity(); | |||
9320 | uint64_t DestOffset = Dest.getLValueOffset().getQuantity(); | |||
9321 | if (DestOffset >= SrcOffset && DestOffset - SrcOffset < NBytes) { | |||
9322 | // Dest is inside the source region. | |||
9323 | if (!Move) { | |||
9324 | Info.FFDiag(E, diag::note_constexpr_memcpy_overlap) << WChar; | |||
9325 | return false; | |||
9326 | } | |||
9327 | // For memmove and friends, copy backwards. | |||
9328 | if (!HandleLValueArrayAdjustment(Info, E, Src, T, NElems - 1) || | |||
9329 | !HandleLValueArrayAdjustment(Info, E, Dest, T, NElems - 1)) | |||
9330 | return false; | |||
9331 | Direction = -1; | |||
9332 | } else if (!Move && SrcOffset >= DestOffset && | |||
9333 | SrcOffset - DestOffset < NBytes) { | |||
9334 | // Src is inside the destination region for memcpy: invalid. | |||
9335 | Info.FFDiag(E, diag::note_constexpr_memcpy_overlap) << WChar; | |||
9336 | return false; | |||
9337 | } | |||
9338 | } | |||
9339 | ||||
9340 | while (true) { | |||
9341 | APValue Val; | |||
9342 | // FIXME: Set WantObjectRepresentation to true if we're copying a | |||
9343 | // char-like type? | |||
9344 | if (!handleLValueToRValueConversion(Info, E, T, Src, Val) || | |||
9345 | !handleAssignment(Info, E, Dest, T, Val)) | |||
9346 | return false; | |||
9347 | // Do not iterate past the last element; if we're copying backwards, that | |||
9348 | // might take us off the start of the array. | |||
9349 | if (--NElems == 0) | |||
9350 | return true; | |||
9351 | if (!HandleLValueArrayAdjustment(Info, E, Src, T, Direction) || | |||
9352 | !HandleLValueArrayAdjustment(Info, E, Dest, T, Direction)) | |||
9353 | return false; | |||
9354 | } | |||
9355 | } | |||
9356 | ||||
9357 | default: | |||
9358 | break; | |||
9359 | } | |||
9360 | ||||
9361 | return visitNonBuiltinCallExpr(E); | |||
9362 | } | |||
9363 | ||||
9364 | static bool EvaluateArrayNewInitList(EvalInfo &Info, LValue &This, | |||
9365 | APValue &Result, const InitListExpr *ILE, | |||
9366 | QualType AllocType); | |||
9367 | static bool EvaluateArrayNewConstructExpr(EvalInfo &Info, LValue &This, | |||
9368 | APValue &Result, | |||
9369 | const CXXConstructExpr *CCE, | |||
9370 | QualType AllocType); | |||
9371 | ||||
9372 | bool PointerExprEvaluator::VisitCXXNewExpr(const CXXNewExpr *E) { | |||
9373 | if (!Info.getLangOpts().CPlusPlus20) | |||
9374 | Info.CCEDiag(E, diag::note_constexpr_new); | |||
9375 | ||||
9376 | // We cannot speculatively evaluate a delete expression. | |||
9377 | if (Info.SpeculativeEvaluationDepth) | |||
9378 | return false; | |||
9379 | ||||
9380 | FunctionDecl *OperatorNew = E->getOperatorNew(); | |||
9381 | ||||
9382 | bool IsNothrow = false; | |||
9383 | bool IsPlacement = false; | |||
9384 | if (OperatorNew->isReservedGlobalPlacementOperator() && | |||
9385 | Info.CurrentCall->isStdFunction() && !E->isArray()) { | |||
9386 | // FIXME Support array placement new. | |||
9387 | assert(E->getNumPlacementArgs() == 1)(static_cast <bool> (E->getNumPlacementArgs() == 1) ? void (0) : __assert_fail ("E->getNumPlacementArgs() == 1" , "clang/lib/AST/ExprConstant.cpp", 9387, __extension__ __PRETTY_FUNCTION__ )); | |||
9388 | if (!EvaluatePointer(E->getPlacementArg(0), Result, Info)) | |||
9389 | return false; | |||
9390 | if (Result.Designator.Invalid) | |||
9391 | return false; | |||
9392 | IsPlacement = true; | |||
9393 | } else if (!OperatorNew->isReplaceableGlobalAllocationFunction()) { | |||
9394 | Info.FFDiag(E, diag::note_constexpr_new_non_replaceable) | |||
9395 | << isa<CXXMethodDecl>(OperatorNew) << OperatorNew; | |||
9396 | return false; | |||
9397 | } else if (E->getNumPlacementArgs()) { | |||
9398 | // The only new-placement list we support is of the form (std::nothrow). | |||
9399 | // | |||
9400 | // FIXME: There is no restriction on this, but it's not clear that any | |||
9401 | // other form makes any sense. We get here for cases such as: | |||
9402 | // | |||
9403 | // new (std::align_val_t{N}) X(int) | |||
9404 | // | |||
9405 | // (which should presumably be valid only if N is a multiple of | |||
9406 | // alignof(int), and in any case can't be deallocated unless N is | |||
9407 | // alignof(X) and X has new-extended alignment). | |||
9408 | if (E->getNumPlacementArgs() != 1 || | |||
9409 | !E->getPlacementArg(0)->getType()->isNothrowT()) | |||
9410 | return Error(E, diag::note_constexpr_new_placement); | |||
9411 | ||||
9412 | LValue Nothrow; | |||
9413 | if (!EvaluateLValue(E->getPlacementArg(0), Nothrow, Info)) | |||
9414 | return false; | |||
9415 | IsNothrow = true; | |||
9416 | } | |||
9417 | ||||
9418 | const Expr *Init = E->getInitializer(); | |||
9419 | const InitListExpr *ResizedArrayILE = nullptr; | |||
9420 | const CXXConstructExpr *ResizedArrayCCE = nullptr; | |||
9421 | bool ValueInit = false; | |||
9422 | ||||
9423 | QualType AllocType = E->getAllocatedType(); | |||
9424 | if (Optional<const Expr*> ArraySize = E->getArraySize()) { | |||
9425 | const Expr *Stripped = *ArraySize; | |||
9426 | for (; auto *ICE = dyn_cast<ImplicitCastExpr>(Stripped); | |||
9427 | Stripped = ICE->getSubExpr()) | |||
9428 | if (ICE->getCastKind() != CK_NoOp && | |||
9429 | ICE->getCastKind() != CK_IntegralCast) | |||
9430 | break; | |||
9431 | ||||
9432 | llvm::APSInt ArrayBound; | |||
9433 | if (!EvaluateInteger(Stripped, ArrayBound, Info)) | |||
9434 | return false; | |||
9435 | ||||
9436 | // C++ [expr.new]p9: | |||
9437 | // The expression is erroneous if: | |||
9438 | // -- [...] its value before converting to size_t [or] applying the | |||
9439 | // second standard conversion sequence is less than zero | |||
9440 | if (ArrayBound.isSigned() && ArrayBound.isNegative()) { | |||
9441 | if (IsNothrow) | |||
9442 | return ZeroInitialization(E); | |||
9443 | ||||
9444 | Info.FFDiag(*ArraySize, diag::note_constexpr_new_negative) | |||
9445 | << ArrayBound << (*ArraySize)->getSourceRange(); | |||
9446 | return false; | |||
9447 | } | |||
9448 | ||||
9449 | // -- its value is such that the size of the allocated object would | |||
9450 | // exceed the implementation-defined limit | |||
9451 | if (ConstantArrayType::getNumAddressingBits(Info.Ctx, AllocType, | |||
9452 | ArrayBound) > | |||
9453 | ConstantArrayType::getMaxSizeBits(Info.Ctx)) { | |||
9454 | if (IsNothrow) | |||
9455 | return ZeroInitialization(E); | |||
9456 | ||||
9457 | Info.FFDiag(*ArraySize, diag::note_constexpr_new_too_large) | |||
9458 | << ArrayBound << (*ArraySize)->getSourceRange(); | |||
9459 | return false; | |||
9460 | } | |||
9461 | ||||
9462 | // -- the new-initializer is a braced-init-list and the number of | |||
9463 | // array elements for which initializers are provided [...] | |||
9464 | // exceeds the number of elements to initialize | |||
9465 | if (!Init) { | |||
9466 | // No initialization is performed. | |||
9467 | } else if (isa<CXXScalarValueInitExpr>(Init) || | |||
9468 | isa<ImplicitValueInitExpr>(Init)) { | |||
9469 | ValueInit = true; | |||
9470 | } else if (auto *CCE = dyn_cast<CXXConstructExpr>(Init)) { | |||
9471 | ResizedArrayCCE = CCE; | |||
9472 | } else { | |||
9473 | auto *CAT = Info.Ctx.getAsConstantArrayType(Init->getType()); | |||
9474 | assert(CAT && "unexpected type for array initializer")(static_cast <bool> (CAT && "unexpected type for array initializer" ) ? void (0) : __assert_fail ("CAT && \"unexpected type for array initializer\"" , "clang/lib/AST/ExprConstant.cpp", 9474, __extension__ __PRETTY_FUNCTION__ )); | |||
9475 | ||||
9476 | unsigned Bits = | |||
9477 | std::max(CAT->getSize().getBitWidth(), ArrayBound.getBitWidth()); | |||
9478 | llvm::APInt InitBound = CAT->getSize().zextOrSelf(Bits); | |||
9479 | llvm::APInt AllocBound = ArrayBound.zextOrSelf(Bits); | |||
9480 | if (InitBound.ugt(AllocBound)) { | |||
9481 | if (IsNothrow) | |||
9482 | return ZeroInitialization(E); | |||
9483 | ||||
9484 | Info.FFDiag(*ArraySize, diag::note_constexpr_new_too_small) | |||
9485 | << toString(AllocBound, 10, /*Signed=*/false) | |||
9486 | << toString(InitBound, 10, /*Signed=*/false) | |||
9487 | << (*ArraySize)->getSourceRange(); | |||
9488 | return false; | |||
9489 | } | |||
9490 | ||||
9491 | // If the sizes differ, we must have an initializer list, and we need | |||
9492 | // special handling for this case when we initialize. | |||
9493 | if (InitBound != AllocBound) | |||
9494 | ResizedArrayILE = cast<InitListExpr>(Init); | |||
9495 | } | |||
9496 | ||||
9497 | AllocType = Info.Ctx.getConstantArrayType(AllocType, ArrayBound, nullptr, | |||
9498 | ArrayType::Normal, 0); | |||
9499 | } else { | |||
9500 | assert(!AllocType->isArrayType() &&(static_cast <bool> (!AllocType->isArrayType() && "array allocation with non-array new") ? void (0) : __assert_fail ("!AllocType->isArrayType() && \"array allocation with non-array new\"" , "clang/lib/AST/ExprConstant.cpp", 9501, __extension__ __PRETTY_FUNCTION__ )) | |||
9501 | "array allocation with non-array new")(static_cast <bool> (!AllocType->isArrayType() && "array allocation with non-array new") ? void (0) : __assert_fail ("!AllocType->isArrayType() && \"array allocation with non-array new\"" , "clang/lib/AST/ExprConstant.cpp", 9501, __extension__ __PRETTY_FUNCTION__ )); | |||
9502 | } | |||
9503 | ||||
9504 | APValue *Val; | |||
9505 | if (IsPlacement) { | |||
9506 | AccessKinds AK = AK_Construct; | |||
9507 | struct FindObjectHandler { | |||
9508 | EvalInfo &Info; | |||
9509 | const Expr *E; | |||
9510 | QualType AllocType; | |||
9511 | const AccessKinds AccessKind; | |||
9512 | APValue *Value; | |||
9513 | ||||
9514 | typedef bool result_type; | |||
9515 | bool failed() { return false; } | |||
9516 | bool found(APValue &Subobj, QualType SubobjType) { | |||
9517 | // FIXME: Reject the cases where [basic.life]p8 would not permit the | |||
9518 | // old name of the object to be used to name the new object. | |||
9519 | if (!Info.Ctx.hasSameUnqualifiedType(SubobjType, AllocType)) { | |||
9520 | Info.FFDiag(E, diag::note_constexpr_placement_new_wrong_type) << | |||
9521 | SubobjType << AllocType; | |||
9522 | return false; | |||
9523 | } | |||
9524 | Value = &Subobj; | |||
9525 | return true; | |||
9526 | } | |||
9527 | bool found(APSInt &Value, QualType SubobjType) { | |||
9528 | Info.FFDiag(E, diag::note_constexpr_construct_complex_elem); | |||
9529 | return false; | |||
9530 | } | |||
9531 | bool found(APFloat &Value, QualType SubobjType) { | |||
9532 | Info.FFDiag(E, diag::note_constexpr_construct_complex_elem); | |||
9533 | return false; | |||
9534 | } | |||
9535 | } Handler = {Info, E, AllocType, AK, nullptr}; | |||
9536 | ||||
9537 | CompleteObject Obj = findCompleteObject(Info, E, AK, Result, AllocType); | |||
9538 | if (!Obj || !findSubobject(Info, E, Obj, Result.Designator, Handler)) | |||
9539 | return false; | |||
9540 | ||||
9541 | Val = Handler.Value; | |||
9542 | ||||
9543 | // [basic.life]p1: | |||
9544 | // The lifetime of an object o of type T ends when [...] the storage | |||
9545 | // which the object occupies is [...] reused by an object that is not | |||
9546 | // nested within o (6.6.2). | |||
9547 | *Val = APValue(); | |||
9548 | } else { | |||
9549 | // Perform the allocation and obtain a pointer to the resulting object. | |||
9550 | Val = Info.createHeapAlloc(E, AllocType, Result); | |||
9551 | if (!Val) | |||
9552 | return false; | |||
9553 | } | |||
9554 | ||||
9555 | if (ValueInit) { | |||
9556 | ImplicitValueInitExpr VIE(AllocType); | |||
9557 | if (!EvaluateInPlace(*Val, Info, Result, &VIE)) | |||
9558 | return false; | |||
9559 | } else if (ResizedArrayILE) { | |||
9560 | if (!EvaluateArrayNewInitList(Info, Result, *Val, ResizedArrayILE, | |||
9561 | AllocType)) | |||
9562 | return false; | |||
9563 | } else if (ResizedArrayCCE) { | |||
9564 | if (!EvaluateArrayNewConstructExpr(Info, Result, *Val, ResizedArrayCCE, | |||
9565 | AllocType)) | |||
9566 | return false; | |||
9567 | } else if (Init) { | |||
9568 | if (!EvaluateInPlace(*Val, Info, Result, Init)) | |||
9569 | return false; | |||
9570 | } else if (!getDefaultInitValue(AllocType, *Val)) { | |||
9571 | return false; | |||
9572 | } | |||
9573 | ||||
9574 | // Array new returns a pointer to the first element, not a pointer to the | |||
9575 | // array. | |||
9576 | if (auto *AT = AllocType->getAsArrayTypeUnsafe()) | |||
9577 | Result.addArray(Info, E, cast<ConstantArrayType>(AT)); | |||
9578 | ||||
9579 | return true; | |||
9580 | } | |||
9581 | //===----------------------------------------------------------------------===// | |||
9582 | // Member Pointer Evaluation | |||
9583 | //===----------------------------------------------------------------------===// | |||
9584 | ||||
9585 | namespace { | |||
9586 | class MemberPointerExprEvaluator | |||
9587 | : public ExprEvaluatorBase<MemberPointerExprEvaluator> { | |||
9588 | MemberPtr &Result; | |||
9589 | ||||
9590 | bool Success(const ValueDecl *D) { | |||
9591 | Result = MemberPtr(D); | |||
9592 | return true; | |||
9593 | } | |||
9594 | public: | |||
9595 | ||||
9596 | MemberPointerExprEvaluator(EvalInfo &Info, MemberPtr &Result) | |||
9597 | : ExprEvaluatorBaseTy(Info), Result(Result) {} | |||
9598 | ||||
9599 | bool Success(const APValue &V, const Expr *E) { | |||
9600 | Result.setFrom(V); | |||
9601 | return true; | |||
9602 | } | |||
9603 | bool ZeroInitialization(const Expr *E) { | |||
9604 | return Success((const ValueDecl*)nullptr); | |||
9605 | } | |||
9606 | ||||
9607 | bool VisitCastExpr(const CastExpr *E); | |||
9608 | bool VisitUnaryAddrOf(const UnaryOperator *E); | |||
9609 | }; | |||
9610 | } // end anonymous namespace | |||
9611 | ||||
9612 | static bool EvaluateMemberPointer(const Expr *E, MemberPtr &Result, | |||
9613 | EvalInfo &Info) { | |||
9614 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 9614, __extension__ __PRETTY_FUNCTION__)); | |||
9615 | assert(E->isPRValue() && E->getType()->isMemberPointerType())(static_cast <bool> (E->isPRValue() && E-> getType()->isMemberPointerType()) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isMemberPointerType()" , "clang/lib/AST/ExprConstant.cpp", 9615, __extension__ __PRETTY_FUNCTION__ )); | |||
9616 | return MemberPointerExprEvaluator(Info, Result).Visit(E); | |||
9617 | } | |||
9618 | ||||
9619 | bool MemberPointerExprEvaluator::VisitCastExpr(const CastExpr *E) { | |||
9620 | switch (E->getCastKind()) { | |||
9621 | default: | |||
9622 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
9623 | ||||
9624 | case CK_NullToMemberPointer: | |||
9625 | VisitIgnoredValue(E->getSubExpr()); | |||
9626 | return ZeroInitialization(E); | |||
9627 | ||||
9628 | case CK_BaseToDerivedMemberPointer: { | |||
9629 | if (!Visit(E->getSubExpr())) | |||
9630 | return false; | |||
9631 | if (E->path_empty()) | |||
9632 | return true; | |||
9633 | // Base-to-derived member pointer casts store the path in derived-to-base | |||
9634 | // order, so iterate backwards. The CXXBaseSpecifier also provides us with | |||
9635 | // the wrong end of the derived->base arc, so stagger the path by one class. | |||
9636 | typedef std::reverse_iterator<CastExpr::path_const_iterator> ReverseIter; | |||
9637 | for (ReverseIter PathI(E->path_end() - 1), PathE(E->path_begin()); | |||
9638 | PathI != PathE; ++PathI) { | |||
9639 | assert(!(*PathI)->isVirtual() && "memptr cast through vbase")(static_cast <bool> (!(*PathI)->isVirtual() && "memptr cast through vbase") ? void (0) : __assert_fail ("!(*PathI)->isVirtual() && \"memptr cast through vbase\"" , "clang/lib/AST/ExprConstant.cpp", 9639, __extension__ __PRETTY_FUNCTION__ )); | |||
9640 | const CXXRecordDecl *Derived = (*PathI)->getType()->getAsCXXRecordDecl(); | |||
9641 | if (!Result.castToDerived(Derived)) | |||
9642 | return Error(E); | |||
9643 | } | |||
9644 | const Type *FinalTy = E->getType()->castAs<MemberPointerType>()->getClass(); | |||
9645 | if (!Result.castToDerived(FinalTy->getAsCXXRecordDecl())) | |||
9646 | return Error(E); | |||
9647 | return true; | |||
9648 | } | |||
9649 | ||||
9650 | case CK_DerivedToBaseMemberPointer: | |||
9651 | if (!Visit(E->getSubExpr())) | |||
9652 | return false; | |||
9653 | for (CastExpr::path_const_iterator PathI = E->path_begin(), | |||
9654 | PathE = E->path_end(); PathI != PathE; ++PathI) { | |||
9655 | assert(!(*PathI)->isVirtual() && "memptr cast through vbase")(static_cast <bool> (!(*PathI)->isVirtual() && "memptr cast through vbase") ? void (0) : __assert_fail ("!(*PathI)->isVirtual() && \"memptr cast through vbase\"" , "clang/lib/AST/ExprConstant.cpp", 9655, __extension__ __PRETTY_FUNCTION__ )); | |||
9656 | const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); | |||
9657 | if (!Result.castToBase(Base)) | |||
9658 | return Error(E); | |||
9659 | } | |||
9660 | return true; | |||
9661 | } | |||
9662 | } | |||
9663 | ||||
9664 | bool MemberPointerExprEvaluator::VisitUnaryAddrOf(const UnaryOperator *E) { | |||
9665 | // C++11 [expr.unary.op]p3 has very strict rules on how the address of a | |||
9666 | // member can be formed. | |||
9667 | return Success(cast<DeclRefExpr>(E->getSubExpr())->getDecl()); | |||
9668 | } | |||
9669 | ||||
9670 | //===----------------------------------------------------------------------===// | |||
9671 | // Record Evaluation | |||
9672 | //===----------------------------------------------------------------------===// | |||
9673 | ||||
9674 | namespace { | |||
9675 | class RecordExprEvaluator | |||
9676 | : public ExprEvaluatorBase<RecordExprEvaluator> { | |||
9677 | const LValue &This; | |||
9678 | APValue &Result; | |||
9679 | public: | |||
9680 | ||||
9681 | RecordExprEvaluator(EvalInfo &info, const LValue &This, APValue &Result) | |||
9682 | : ExprEvaluatorBaseTy(info), This(This), Result(Result) {} | |||
9683 | ||||
9684 | bool Success(const APValue &V, const Expr *E) { | |||
9685 | Result = V; | |||
9686 | return true; | |||
9687 | } | |||
9688 | bool ZeroInitialization(const Expr *E) { | |||
9689 | return ZeroInitialization(E, E->getType()); | |||
9690 | } | |||
9691 | bool ZeroInitialization(const Expr *E, QualType T); | |||
9692 | ||||
9693 | bool VisitCallExpr(const CallExpr *E) { | |||
9694 | return handleCallExpr(E, Result, &This); | |||
9695 | } | |||
9696 | bool VisitCastExpr(const CastExpr *E); | |||
9697 | bool VisitInitListExpr(const InitListExpr *E); | |||
9698 | bool VisitCXXConstructExpr(const CXXConstructExpr *E) { | |||
9699 | return VisitCXXConstructExpr(E, E->getType()); | |||
9700 | } | |||
9701 | bool VisitLambdaExpr(const LambdaExpr *E); | |||
9702 | bool VisitCXXInheritedCtorInitExpr(const CXXInheritedCtorInitExpr *E); | |||
9703 | bool VisitCXXConstructExpr(const CXXConstructExpr *E, QualType T); | |||
9704 | bool VisitCXXStdInitializerListExpr(const CXXStdInitializerListExpr *E); | |||
9705 | bool VisitBinCmp(const BinaryOperator *E); | |||
9706 | }; | |||
9707 | } | |||
9708 | ||||
9709 | /// Perform zero-initialization on an object of non-union class type. | |||
9710 | /// C++11 [dcl.init]p5: | |||
9711 | /// To zero-initialize an object or reference of type T means: | |||
9712 | /// [...] | |||
9713 | /// -- if T is a (possibly cv-qualified) non-union class type, | |||
9714 | /// each non-static data member and each base-class subobject is | |||
9715 | /// zero-initialized | |||
9716 | static bool HandleClassZeroInitialization(EvalInfo &Info, const Expr *E, | |||
9717 | const RecordDecl *RD, | |||
9718 | const LValue &This, APValue &Result) { | |||
9719 | assert(!RD->isUnion() && "Expected non-union class type")(static_cast <bool> (!RD->isUnion() && "Expected non-union class type" ) ? void (0) : __assert_fail ("!RD->isUnion() && \"Expected non-union class type\"" , "clang/lib/AST/ExprConstant.cpp", 9719, __extension__ __PRETTY_FUNCTION__ )); | |||
9720 | const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(RD); | |||
9721 | Result = APValue(APValue::UninitStruct(), CD ? CD->getNumBases() : 0, | |||
9722 | std::distance(RD->field_begin(), RD->field_end())); | |||
9723 | ||||
9724 | if (RD->isInvalidDecl()) return false; | |||
9725 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | |||
9726 | ||||
9727 | if (CD) { | |||
9728 | unsigned Index = 0; | |||
9729 | for (CXXRecordDecl::base_class_const_iterator I = CD->bases_begin(), | |||
9730 | End = CD->bases_end(); I != End; ++I, ++Index) { | |||
9731 | const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); | |||
9732 | LValue Subobject = This; | |||
9733 | if (!HandleLValueDirectBase(Info, E, Subobject, CD, Base, &Layout)) | |||
9734 | return false; | |||
9735 | if (!HandleClassZeroInitialization(Info, E, Base, Subobject, | |||
9736 | Result.getStructBase(Index))) | |||
9737 | return false; | |||
9738 | } | |||
9739 | } | |||
9740 | ||||
9741 | for (const auto *I : RD->fields()) { | |||
9742 | // -- if T is a reference type, no initialization is performed. | |||
9743 | if (I->isUnnamedBitfield() || I->getType()->isReferenceType()) | |||
9744 | continue; | |||
9745 | ||||
9746 | LValue Subobject = This; | |||
9747 | if (!HandleLValueMember(Info, E, Subobject, I, &Layout)) | |||
9748 | return false; | |||
9749 | ||||
9750 | ImplicitValueInitExpr VIE(I->getType()); | |||
9751 | if (!EvaluateInPlace( | |||
9752 | Result.getStructField(I->getFieldIndex()), Info, Subobject, &VIE)) | |||
9753 | return false; | |||
9754 | } | |||
9755 | ||||
9756 | return true; | |||
9757 | } | |||
9758 | ||||
9759 | bool RecordExprEvaluator::ZeroInitialization(const Expr *E, QualType T) { | |||
9760 | const RecordDecl *RD = T->castAs<RecordType>()->getDecl(); | |||
9761 | if (RD->isInvalidDecl()) return false; | |||
9762 | if (RD->isUnion()) { | |||
9763 | // C++11 [dcl.init]p5: If T is a (possibly cv-qualified) union type, the | |||
9764 | // object's first non-static named data member is zero-initialized | |||
9765 | RecordDecl::field_iterator I = RD->field_begin(); | |||
9766 | while (I != RD->field_end() && (*I)->isUnnamedBitfield()) | |||
9767 | ++I; | |||
9768 | if (I == RD->field_end()) { | |||
9769 | Result = APValue((const FieldDecl*)nullptr); | |||
9770 | return true; | |||
9771 | } | |||
9772 | ||||
9773 | LValue Subobject = This; | |||
9774 | if (!HandleLValueMember(Info, E, Subobject, *I)) | |||
9775 | return false; | |||
9776 | Result = APValue(*I); | |||
9777 | ImplicitValueInitExpr VIE(I->getType()); | |||
9778 | return EvaluateInPlace(Result.getUnionValue(), Info, Subobject, &VIE); | |||
9779 | } | |||
9780 | ||||
9781 | if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->getNumVBases()) { | |||
9782 | Info.FFDiag(E, diag::note_constexpr_virtual_base) << RD; | |||
9783 | return false; | |||
9784 | } | |||
9785 | ||||
9786 | return HandleClassZeroInitialization(Info, E, RD, This, Result); | |||
9787 | } | |||
9788 | ||||
9789 | bool RecordExprEvaluator::VisitCastExpr(const CastExpr *E) { | |||
9790 | switch (E->getCastKind()) { | |||
9791 | default: | |||
9792 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
9793 | ||||
9794 | case CK_ConstructorConversion: | |||
9795 | return Visit(E->getSubExpr()); | |||
9796 | ||||
9797 | case CK_DerivedToBase: | |||
9798 | case CK_UncheckedDerivedToBase: { | |||
9799 | APValue DerivedObject; | |||
9800 | if (!Evaluate(DerivedObject, Info, E->getSubExpr())) | |||
9801 | return false; | |||
9802 | if (!DerivedObject.isStruct()) | |||
9803 | return Error(E->getSubExpr()); | |||
9804 | ||||
9805 | // Derived-to-base rvalue conversion: just slice off the derived part. | |||
9806 | APValue *Value = &DerivedObject; | |||
9807 | const CXXRecordDecl *RD = E->getSubExpr()->getType()->getAsCXXRecordDecl(); | |||
9808 | for (CastExpr::path_const_iterator PathI = E->path_begin(), | |||
9809 | PathE = E->path_end(); PathI != PathE; ++PathI) { | |||
9810 | assert(!(*PathI)->isVirtual() && "record rvalue with virtual base")(static_cast <bool> (!(*PathI)->isVirtual() && "record rvalue with virtual base") ? void (0) : __assert_fail ("!(*PathI)->isVirtual() && \"record rvalue with virtual base\"" , "clang/lib/AST/ExprConstant.cpp", 9810, __extension__ __PRETTY_FUNCTION__ )); | |||
9811 | const CXXRecordDecl *Base = (*PathI)->getType()->getAsCXXRecordDecl(); | |||
9812 | Value = &Value->getStructBase(getBaseIndex(RD, Base)); | |||
9813 | RD = Base; | |||
9814 | } | |||
9815 | Result = *Value; | |||
9816 | return true; | |||
9817 | } | |||
9818 | } | |||
9819 | } | |||
9820 | ||||
9821 | bool RecordExprEvaluator::VisitInitListExpr(const InitListExpr *E) { | |||
9822 | if (E->isTransparent()) | |||
9823 | return Visit(E->getInit(0)); | |||
9824 | ||||
9825 | const RecordDecl *RD = E->getType()->castAs<RecordType>()->getDecl(); | |||
9826 | if (RD->isInvalidDecl()) return false; | |||
9827 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(RD); | |||
9828 | auto *CXXRD = dyn_cast<CXXRecordDecl>(RD); | |||
9829 | ||||
9830 | EvalInfo::EvaluatingConstructorRAII EvalObj( | |||
9831 | Info, | |||
9832 | ObjectUnderConstruction{This.getLValueBase(), This.Designator.Entries}, | |||
9833 | CXXRD && CXXRD->getNumBases()); | |||
9834 | ||||
9835 | if (RD->isUnion()) { | |||
9836 | const FieldDecl *Field = E->getInitializedFieldInUnion(); | |||
9837 | Result = APValue(Field); | |||
9838 | if (!Field) | |||
9839 | return true; | |||
9840 | ||||
9841 | // If the initializer list for a union does not contain any elements, the | |||
9842 | // first element of the union is value-initialized. | |||
9843 | // FIXME: The element should be initialized from an initializer list. | |||
9844 | // Is this difference ever observable for initializer lists which | |||
9845 | // we don't build? | |||
9846 | ImplicitValueInitExpr VIE(Field->getType()); | |||
9847 | const Expr *InitExpr = E->getNumInits() ? E->getInit(0) : &VIE; | |||
9848 | ||||
9849 | LValue Subobject = This; | |||
9850 | if (!HandleLValueMember(Info, InitExpr, Subobject, Field, &Layout)) | |||
9851 | return false; | |||
9852 | ||||
9853 | // Temporarily override This, in case there's a CXXDefaultInitExpr in here. | |||
9854 | ThisOverrideRAII ThisOverride(*Info.CurrentCall, &This, | |||
9855 | isa<CXXDefaultInitExpr>(InitExpr)); | |||
9856 | ||||
9857 | if (EvaluateInPlace(Result.getUnionValue(), Info, Subobject, InitExpr)) { | |||
9858 | if (Field->isBitField()) | |||
9859 | return truncateBitfieldValue(Info, InitExpr, Result.getUnionValue(), | |||
9860 | Field); | |||
9861 | return true; | |||
9862 | } | |||
9863 | ||||
9864 | return false; | |||
9865 | } | |||
9866 | ||||
9867 | if (!Result.hasValue()) | |||
9868 | Result = APValue(APValue::UninitStruct(), CXXRD ? CXXRD->getNumBases() : 0, | |||
9869 | std::distance(RD->field_begin(), RD->field_end())); | |||
9870 | unsigned ElementNo = 0; | |||
9871 | bool Success = true; | |||
9872 | ||||
9873 | // Initialize base classes. | |||
9874 | if (CXXRD && CXXRD->getNumBases()) { | |||
9875 | for (const auto &Base : CXXRD->bases()) { | |||
9876 | assert(ElementNo < E->getNumInits() && "missing init for base class")(static_cast <bool> (ElementNo < E->getNumInits() && "missing init for base class") ? void (0) : __assert_fail ("ElementNo < E->getNumInits() && \"missing init for base class\"" , "clang/lib/AST/ExprConstant.cpp", 9876, __extension__ __PRETTY_FUNCTION__ )); | |||
9877 | const Expr *Init = E->getInit(ElementNo); | |||
9878 | ||||
9879 | LValue Subobject = This; | |||
9880 | if (!HandleLValueBase(Info, Init, Subobject, CXXRD, &Base)) | |||
9881 | return false; | |||
9882 | ||||
9883 | APValue &FieldVal = Result.getStructBase(ElementNo); | |||
9884 | if (!EvaluateInPlace(FieldVal, Info, Subobject, Init)) { | |||
9885 | if (!Info.noteFailure()) | |||
9886 | return false; | |||
9887 | Success = false; | |||
9888 | } | |||
9889 | ++ElementNo; | |||
9890 | } | |||
9891 | ||||
9892 | EvalObj.finishedConstructingBases(); | |||
9893 | } | |||
9894 | ||||
9895 | // Initialize members. | |||
9896 | for (const auto *Field : RD->fields()) { | |||
9897 | // Anonymous bit-fields are not considered members of the class for | |||
9898 | // purposes of aggregate initialization. | |||
9899 | if (Field->isUnnamedBitfield()) | |||
9900 | continue; | |||
9901 | ||||
9902 | LValue Subobject = This; | |||
9903 | ||||
9904 | bool HaveInit = ElementNo < E->getNumInits(); | |||
9905 | ||||
9906 | // FIXME: Diagnostics here should point to the end of the initializer | |||
9907 | // list, not the start. | |||
9908 | if (!HandleLValueMember(Info, HaveInit ? E->getInit(ElementNo) : E, | |||
9909 | Subobject, Field, &Layout)) | |||
9910 | return false; | |||
9911 | ||||
9912 | // Perform an implicit value-initialization for members beyond the end of | |||
9913 | // the initializer list. | |||
9914 | ImplicitValueInitExpr VIE(HaveInit ? Info.Ctx.IntTy : Field->getType()); | |||
9915 | const Expr *Init = HaveInit ? E->getInit(ElementNo++) : &VIE; | |||
9916 | ||||
9917 | // Temporarily override This, in case there's a CXXDefaultInitExpr in here. | |||
9918 | ThisOverrideRAII ThisOverride(*Info.CurrentCall, &This, | |||
9919 | isa<CXXDefaultInitExpr>(Init)); | |||
9920 | ||||
9921 | APValue &FieldVal = Result.getStructField(Field->getFieldIndex()); | |||
9922 | if (!EvaluateInPlace(FieldVal, Info, Subobject, Init) || | |||
9923 | (Field->isBitField() && !truncateBitfieldValue(Info, Init, | |||
9924 | FieldVal, Field))) { | |||
9925 | if (!Info.noteFailure()) | |||
9926 | return false; | |||
9927 | Success = false; | |||
9928 | } | |||
9929 | } | |||
9930 | ||||
9931 | EvalObj.finishedConstructingFields(); | |||
9932 | ||||
9933 | return Success; | |||
9934 | } | |||
9935 | ||||
9936 | bool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E, | |||
9937 | QualType T) { | |||
9938 | // Note that E's type is not necessarily the type of our class here; we might | |||
9939 | // be initializing an array element instead. | |||
9940 | const CXXConstructorDecl *FD = E->getConstructor(); | |||
9941 | if (FD->isInvalidDecl() || FD->getParent()->isInvalidDecl()) return false; | |||
9942 | ||||
9943 | bool ZeroInit = E->requiresZeroInitialization(); | |||
9944 | if (CheckTrivialDefaultConstructor(Info, E->getExprLoc(), FD, ZeroInit)) { | |||
9945 | // If we've already performed zero-initialization, we're already done. | |||
9946 | if (Result.hasValue()) | |||
9947 | return true; | |||
9948 | ||||
9949 | if (ZeroInit) | |||
9950 | return ZeroInitialization(E, T); | |||
9951 | ||||
9952 | return getDefaultInitValue(T, Result); | |||
9953 | } | |||
9954 | ||||
9955 | const FunctionDecl *Definition = nullptr; | |||
9956 | auto Body = FD->getBody(Definition); | |||
9957 | ||||
9958 | if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition, Body)) | |||
9959 | return false; | |||
9960 | ||||
9961 | // Avoid materializing a temporary for an elidable copy/move constructor. | |||
9962 | if (E->isElidable() && !ZeroInit) { | |||
9963 | // FIXME: This only handles the simplest case, where the source object | |||
9964 | // is passed directly as the first argument to the constructor. | |||
9965 | // This should also handle stepping though implicit casts and | |||
9966 | // and conversion sequences which involve two steps, with a | |||
9967 | // conversion operator followed by a converting constructor. | |||
9968 | const Expr *SrcObj = E->getArg(0); | |||
9969 | assert(SrcObj->isTemporaryObject(Info.Ctx, FD->getParent()))(static_cast <bool> (SrcObj->isTemporaryObject(Info. Ctx, FD->getParent())) ? void (0) : __assert_fail ("SrcObj->isTemporaryObject(Info.Ctx, FD->getParent())" , "clang/lib/AST/ExprConstant.cpp", 9969, __extension__ __PRETTY_FUNCTION__ )); | |||
9970 | assert(Info.Ctx.hasSameUnqualifiedType(E->getType(), SrcObj->getType()))(static_cast <bool> (Info.Ctx.hasSameUnqualifiedType(E-> getType(), SrcObj->getType())) ? void (0) : __assert_fail ( "Info.Ctx.hasSameUnqualifiedType(E->getType(), SrcObj->getType())" , "clang/lib/AST/ExprConstant.cpp", 9970, __extension__ __PRETTY_FUNCTION__ )); | |||
9971 | if (const MaterializeTemporaryExpr *ME = | |||
9972 | dyn_cast<MaterializeTemporaryExpr>(SrcObj)) | |||
9973 | return Visit(ME->getSubExpr()); | |||
9974 | } | |||
9975 | ||||
9976 | if (ZeroInit && !ZeroInitialization(E, T)) | |||
9977 | return false; | |||
9978 | ||||
9979 | auto Args = llvm::makeArrayRef(E->getArgs(), E->getNumArgs()); | |||
9980 | return HandleConstructorCall(E, This, Args, | |||
9981 | cast<CXXConstructorDecl>(Definition), Info, | |||
9982 | Result); | |||
9983 | } | |||
9984 | ||||
9985 | bool RecordExprEvaluator::VisitCXXInheritedCtorInitExpr( | |||
9986 | const CXXInheritedCtorInitExpr *E) { | |||
9987 | if (!Info.CurrentCall) { | |||
9988 | assert(Info.checkingPotentialConstantExpression())(static_cast <bool> (Info.checkingPotentialConstantExpression ()) ? void (0) : __assert_fail ("Info.checkingPotentialConstantExpression()" , "clang/lib/AST/ExprConstant.cpp", 9988, __extension__ __PRETTY_FUNCTION__ )); | |||
9989 | return false; | |||
9990 | } | |||
9991 | ||||
9992 | const CXXConstructorDecl *FD = E->getConstructor(); | |||
9993 | if (FD->isInvalidDecl() || FD->getParent()->isInvalidDecl()) | |||
9994 | return false; | |||
9995 | ||||
9996 | const FunctionDecl *Definition = nullptr; | |||
9997 | auto Body = FD->getBody(Definition); | |||
9998 | ||||
9999 | if (!CheckConstexprFunction(Info, E->getExprLoc(), FD, Definition, Body)) | |||
10000 | return false; | |||
10001 | ||||
10002 | return HandleConstructorCall(E, This, Info.CurrentCall->Arguments, | |||
10003 | cast<CXXConstructorDecl>(Definition), Info, | |||
10004 | Result); | |||
10005 | } | |||
10006 | ||||
10007 | bool RecordExprEvaluator::VisitCXXStdInitializerListExpr( | |||
10008 | const CXXStdInitializerListExpr *E) { | |||
10009 | const ConstantArrayType *ArrayType = | |||
10010 | Info.Ctx.getAsConstantArrayType(E->getSubExpr()->getType()); | |||
10011 | ||||
10012 | LValue Array; | |||
10013 | if (!EvaluateLValue(E->getSubExpr(), Array, Info)) | |||
10014 | return false; | |||
10015 | ||||
10016 | // Get a pointer to the first element of the array. | |||
10017 | Array.addArray(Info, E, ArrayType); | |||
10018 | ||||
10019 | auto InvalidType = [&] { | |||
10020 | Info.FFDiag(E, diag::note_constexpr_unsupported_layout) | |||
10021 | << E->getType(); | |||
10022 | return false; | |||
10023 | }; | |||
10024 | ||||
10025 | // FIXME: Perform the checks on the field types in SemaInit. | |||
10026 | RecordDecl *Record = E->getType()->castAs<RecordType>()->getDecl(); | |||
10027 | RecordDecl::field_iterator Field = Record->field_begin(); | |||
10028 | if (Field == Record->field_end()) | |||
10029 | return InvalidType(); | |||
10030 | ||||
10031 | // Start pointer. | |||
10032 | if (!Field->getType()->isPointerType() || | |||
10033 | !Info.Ctx.hasSameType(Field->getType()->getPointeeType(), | |||
10034 | ArrayType->getElementType())) | |||
10035 | return InvalidType(); | |||
10036 | ||||
10037 | // FIXME: What if the initializer_list type has base classes, etc? | |||
10038 | Result = APValue(APValue::UninitStruct(), 0, 2); | |||
10039 | Array.moveInto(Result.getStructField(0)); | |||
10040 | ||||
10041 | if (++Field == Record->field_end()) | |||
10042 | return InvalidType(); | |||
10043 | ||||
10044 | if (Field->getType()->isPointerType() && | |||
10045 | Info.Ctx.hasSameType(Field->getType()->getPointeeType(), | |||
10046 | ArrayType->getElementType())) { | |||
10047 | // End pointer. | |||
10048 | if (!HandleLValueArrayAdjustment(Info, E, Array, | |||
10049 | ArrayType->getElementType(), | |||
10050 | ArrayType->getSize().getZExtValue())) | |||
10051 | return false; | |||
10052 | Array.moveInto(Result.getStructField(1)); | |||
10053 | } else if (Info.Ctx.hasSameType(Field->getType(), Info.Ctx.getSizeType())) | |||
10054 | // Length. | |||
10055 | Result.getStructField(1) = APValue(APSInt(ArrayType->getSize())); | |||
10056 | else | |||
10057 | return InvalidType(); | |||
10058 | ||||
10059 | if (++Field != Record->field_end()) | |||
10060 | return InvalidType(); | |||
10061 | ||||
10062 | return true; | |||
10063 | } | |||
10064 | ||||
10065 | bool RecordExprEvaluator::VisitLambdaExpr(const LambdaExpr *E) { | |||
10066 | const CXXRecordDecl *ClosureClass = E->getLambdaClass(); | |||
10067 | if (ClosureClass->isInvalidDecl()) | |||
10068 | return false; | |||
10069 | ||||
10070 | const size_t NumFields = | |||
10071 | std::distance(ClosureClass->field_begin(), ClosureClass->field_end()); | |||
10072 | ||||
10073 | assert(NumFields == (size_t)std::distance(E->capture_init_begin(),(static_cast <bool> (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") ? 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\"" , "clang/lib/AST/ExprConstant.cpp", 10076, __extension__ __PRETTY_FUNCTION__ )) | |||
10074 | E->capture_init_end()) &&(static_cast <bool> (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") ? 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\"" , "clang/lib/AST/ExprConstant.cpp", 10076, __extension__ __PRETTY_FUNCTION__ )) | |||
10075 | "The number of lambda capture initializers should equal the number of "(static_cast <bool> (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") ? 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\"" , "clang/lib/AST/ExprConstant.cpp", 10076, __extension__ __PRETTY_FUNCTION__ )) | |||
10076 | "fields within the closure type")(static_cast <bool> (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") ? 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\"" , "clang/lib/AST/ExprConstant.cpp", 10076, __extension__ __PRETTY_FUNCTION__ )); | |||
10077 | ||||
10078 | Result = APValue(APValue::UninitStruct(), /*NumBases*/0, NumFields); | |||
10079 | // Iterate through all the lambda's closure object's fields and initialize | |||
10080 | // them. | |||
10081 | auto *CaptureInitIt = E->capture_init_begin(); | |||
10082 | const LambdaCapture *CaptureIt = ClosureClass->captures_begin(); | |||
10083 | bool Success = true; | |||
10084 | const ASTRecordLayout &Layout = Info.Ctx.getASTRecordLayout(ClosureClass); | |||
10085 | for (const auto *Field : ClosureClass->fields()) { | |||
10086 | assert(CaptureInitIt != E->capture_init_end())(static_cast <bool> (CaptureInitIt != E->capture_init_end ()) ? void (0) : __assert_fail ("CaptureInitIt != E->capture_init_end()" , "clang/lib/AST/ExprConstant.cpp", 10086, __extension__ __PRETTY_FUNCTION__ )); | |||
10087 | // Get the initializer for this field | |||
10088 | Expr *const CurFieldInit = *CaptureInitIt++; | |||
10089 | ||||
10090 | // If there is no initializer, either this is a VLA or an error has | |||
10091 | // occurred. | |||
10092 | if (!CurFieldInit) | |||
10093 | return Error(E); | |||
10094 | ||||
10095 | LValue Subobject = This; | |||
10096 | ||||
10097 | if (!HandleLValueMember(Info, E, Subobject, Field, &Layout)) | |||
10098 | return false; | |||
10099 | ||||
10100 | APValue &FieldVal = Result.getStructField(Field->getFieldIndex()); | |||
10101 | if (!EvaluateInPlace(FieldVal, Info, Subobject, CurFieldInit)) { | |||
10102 | if (!Info.keepEvaluatingAfterFailure()) | |||
10103 | return false; | |||
10104 | Success = false; | |||
10105 | } | |||
10106 | ++CaptureIt; | |||
10107 | } | |||
10108 | return Success; | |||
10109 | } | |||
10110 | ||||
10111 | static bool EvaluateRecord(const Expr *E, const LValue &This, | |||
10112 | APValue &Result, EvalInfo &Info) { | |||
10113 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 10113, __extension__ __PRETTY_FUNCTION__)); | |||
10114 | assert(E->isPRValue() && E->getType()->isRecordType() &&(static_cast <bool> (E->isPRValue() && E-> getType()->isRecordType() && "can't evaluate expression as a record rvalue" ) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isRecordType() && \"can't evaluate expression as a record rvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10115, __extension__ __PRETTY_FUNCTION__ )) | |||
10115 | "can't evaluate expression as a record rvalue")(static_cast <bool> (E->isPRValue() && E-> getType()->isRecordType() && "can't evaluate expression as a record rvalue" ) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isRecordType() && \"can't evaluate expression as a record rvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10115, __extension__ __PRETTY_FUNCTION__ )); | |||
10116 | return RecordExprEvaluator(Info, This, Result).Visit(E); | |||
10117 | } | |||
10118 | ||||
10119 | //===----------------------------------------------------------------------===// | |||
10120 | // Temporary Evaluation | |||
10121 | // | |||
10122 | // Temporaries are represented in the AST as rvalues, but generally behave like | |||
10123 | // lvalues. The full-object of which the temporary is a subobject is implicitly | |||
10124 | // materialized so that a reference can bind to it. | |||
10125 | //===----------------------------------------------------------------------===// | |||
10126 | namespace { | |||
10127 | class TemporaryExprEvaluator | |||
10128 | : public LValueExprEvaluatorBase<TemporaryExprEvaluator> { | |||
10129 | public: | |||
10130 | TemporaryExprEvaluator(EvalInfo &Info, LValue &Result) : | |||
10131 | LValueExprEvaluatorBaseTy(Info, Result, false) {} | |||
10132 | ||||
10133 | /// Visit an expression which constructs the value of this temporary. | |||
10134 | bool VisitConstructExpr(const Expr *E) { | |||
10135 | APValue &Value = Info.CurrentCall->createTemporary( | |||
10136 | E, E->getType(), ScopeKind::FullExpression, Result); | |||
10137 | return EvaluateInPlace(Value, Info, Result, E); | |||
10138 | } | |||
10139 | ||||
10140 | bool VisitCastExpr(const CastExpr *E) { | |||
10141 | switch (E->getCastKind()) { | |||
10142 | default: | |||
10143 | return LValueExprEvaluatorBaseTy::VisitCastExpr(E); | |||
10144 | ||||
10145 | case CK_ConstructorConversion: | |||
10146 | return VisitConstructExpr(E->getSubExpr()); | |||
10147 | } | |||
10148 | } | |||
10149 | bool VisitInitListExpr(const InitListExpr *E) { | |||
10150 | return VisitConstructExpr(E); | |||
10151 | } | |||
10152 | bool VisitCXXConstructExpr(const CXXConstructExpr *E) { | |||
10153 | return VisitConstructExpr(E); | |||
10154 | } | |||
10155 | bool VisitCallExpr(const CallExpr *E) { | |||
10156 | return VisitConstructExpr(E); | |||
10157 | } | |||
10158 | bool VisitCXXStdInitializerListExpr(const CXXStdInitializerListExpr *E) { | |||
10159 | return VisitConstructExpr(E); | |||
10160 | } | |||
10161 | bool VisitLambdaExpr(const LambdaExpr *E) { | |||
10162 | return VisitConstructExpr(E); | |||
10163 | } | |||
10164 | }; | |||
10165 | } // end anonymous namespace | |||
10166 | ||||
10167 | /// Evaluate an expression of record type as a temporary. | |||
10168 | static bool EvaluateTemporary(const Expr *E, LValue &Result, EvalInfo &Info) { | |||
10169 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 10169, __extension__ __PRETTY_FUNCTION__)); | |||
10170 | assert(E->isPRValue() && E->getType()->isRecordType())(static_cast <bool> (E->isPRValue() && E-> getType()->isRecordType()) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isRecordType()" , "clang/lib/AST/ExprConstant.cpp", 10170, __extension__ __PRETTY_FUNCTION__ )); | |||
10171 | return TemporaryExprEvaluator(Info, Result).Visit(E); | |||
10172 | } | |||
10173 | ||||
10174 | //===----------------------------------------------------------------------===// | |||
10175 | // Vector Evaluation | |||
10176 | //===----------------------------------------------------------------------===// | |||
10177 | ||||
10178 | namespace { | |||
10179 | class VectorExprEvaluator | |||
10180 | : public ExprEvaluatorBase<VectorExprEvaluator> { | |||
10181 | APValue &Result; | |||
10182 | public: | |||
10183 | ||||
10184 | VectorExprEvaluator(EvalInfo &info, APValue &Result) | |||
10185 | : ExprEvaluatorBaseTy(info), Result(Result) {} | |||
10186 | ||||
10187 | bool Success(ArrayRef<APValue> V, const Expr *E) { | |||
10188 | assert(V.size() == E->getType()->castAs<VectorType>()->getNumElements())(static_cast <bool> (V.size() == E->getType()->castAs <VectorType>()->getNumElements()) ? void (0) : __assert_fail ("V.size() == E->getType()->castAs<VectorType>()->getNumElements()" , "clang/lib/AST/ExprConstant.cpp", 10188, __extension__ __PRETTY_FUNCTION__ )); | |||
10189 | // FIXME: remove this APValue copy. | |||
10190 | Result = APValue(V.data(), V.size()); | |||
10191 | return true; | |||
10192 | } | |||
10193 | bool Success(const APValue &V, const Expr *E) { | |||
10194 | assert(V.isVector())(static_cast <bool> (V.isVector()) ? void (0) : __assert_fail ("V.isVector()", "clang/lib/AST/ExprConstant.cpp", 10194, __extension__ __PRETTY_FUNCTION__)); | |||
10195 | Result = V; | |||
10196 | return true; | |||
10197 | } | |||
10198 | bool ZeroInitialization(const Expr *E); | |||
10199 | ||||
10200 | bool VisitUnaryReal(const UnaryOperator *E) | |||
10201 | { return Visit(E->getSubExpr()); } | |||
10202 | bool VisitCastExpr(const CastExpr* E); | |||
10203 | bool VisitInitListExpr(const InitListExpr *E); | |||
10204 | bool VisitUnaryImag(const UnaryOperator *E); | |||
10205 | bool VisitBinaryOperator(const BinaryOperator *E); | |||
10206 | bool VisitUnaryOperator(const UnaryOperator *E); | |||
10207 | // FIXME: Missing: conditional operator (for GNU | |||
10208 | // conditional select), shufflevector, ExtVectorElementExpr | |||
10209 | }; | |||
10210 | } // end anonymous namespace | |||
10211 | ||||
10212 | static bool EvaluateVector(const Expr* E, APValue& Result, EvalInfo &Info) { | |||
10213 | assert(E->isPRValue() && E->getType()->isVectorType() &&(static_cast <bool> (E->isPRValue() && E-> getType()->isVectorType() && "not a vector prvalue" ) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isVectorType() && \"not a vector prvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10214, __extension__ __PRETTY_FUNCTION__ )) | |||
10214 | "not a vector prvalue")(static_cast <bool> (E->isPRValue() && E-> getType()->isVectorType() && "not a vector prvalue" ) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isVectorType() && \"not a vector prvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10214, __extension__ __PRETTY_FUNCTION__ )); | |||
10215 | return VectorExprEvaluator(Info, Result).Visit(E); | |||
10216 | } | |||
10217 | ||||
10218 | bool VectorExprEvaluator::VisitCastExpr(const CastExpr *E) { | |||
10219 | const VectorType *VTy = E->getType()->castAs<VectorType>(); | |||
10220 | unsigned NElts = VTy->getNumElements(); | |||
10221 | ||||
10222 | const Expr *SE = E->getSubExpr(); | |||
10223 | QualType SETy = SE->getType(); | |||
10224 | ||||
10225 | switch (E->getCastKind()) { | |||
10226 | case CK_VectorSplat: { | |||
10227 | APValue Val = APValue(); | |||
10228 | if (SETy->isIntegerType()) { | |||
10229 | APSInt IntResult; | |||
10230 | if (!EvaluateInteger(SE, IntResult, Info)) | |||
10231 | return false; | |||
10232 | Val = APValue(std::move(IntResult)); | |||
10233 | } else if (SETy->isRealFloatingType()) { | |||
10234 | APFloat FloatResult(0.0); | |||
10235 | if (!EvaluateFloat(SE, FloatResult, Info)) | |||
10236 | return false; | |||
10237 | Val = APValue(std::move(FloatResult)); | |||
10238 | } else { | |||
10239 | return Error(E); | |||
10240 | } | |||
10241 | ||||
10242 | // Splat and create vector APValue. | |||
10243 | SmallVector<APValue, 4> Elts(NElts, Val); | |||
10244 | return Success(Elts, E); | |||
10245 | } | |||
10246 | case CK_BitCast: { | |||
10247 | // Evaluate the operand into an APInt we can extract from. | |||
10248 | llvm::APInt SValInt; | |||
10249 | if (!EvalAndBitcastToAPInt(Info, SE, SValInt)) | |||
10250 | return false; | |||
10251 | // Extract the elements | |||
10252 | QualType EltTy = VTy->getElementType(); | |||
10253 | unsigned EltSize = Info.Ctx.getTypeSize(EltTy); | |||
10254 | bool BigEndian = Info.Ctx.getTargetInfo().isBigEndian(); | |||
10255 | SmallVector<APValue, 4> Elts; | |||
10256 | if (EltTy->isRealFloatingType()) { | |||
10257 | const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(EltTy); | |||
10258 | unsigned FloatEltSize = EltSize; | |||
10259 | if (&Sem == &APFloat::x87DoubleExtended()) | |||
10260 | FloatEltSize = 80; | |||
10261 | for (unsigned i = 0; i < NElts; i++) { | |||
10262 | llvm::APInt Elt; | |||
10263 | if (BigEndian) | |||
10264 | Elt = SValInt.rotl(i*EltSize+FloatEltSize).trunc(FloatEltSize); | |||
10265 | else | |||
10266 | Elt = SValInt.rotr(i*EltSize).trunc(FloatEltSize); | |||
10267 | Elts.push_back(APValue(APFloat(Sem, Elt))); | |||
10268 | } | |||
10269 | } else if (EltTy->isIntegerType()) { | |||
10270 | for (unsigned i = 0; i < NElts; i++) { | |||
10271 | llvm::APInt Elt; | |||
10272 | if (BigEndian) | |||
10273 | Elt = SValInt.rotl(i*EltSize+EltSize).zextOrTrunc(EltSize); | |||
10274 | else | |||
10275 | Elt = SValInt.rotr(i*EltSize).zextOrTrunc(EltSize); | |||
10276 | Elts.push_back(APValue(APSInt(Elt, !EltTy->isSignedIntegerType()))); | |||
10277 | } | |||
10278 | } else { | |||
10279 | return Error(E); | |||
10280 | } | |||
10281 | return Success(Elts, E); | |||
10282 | } | |||
10283 | default: | |||
10284 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
10285 | } | |||
10286 | } | |||
10287 | ||||
10288 | bool | |||
10289 | VectorExprEvaluator::VisitInitListExpr(const InitListExpr *E) { | |||
10290 | const VectorType *VT = E->getType()->castAs<VectorType>(); | |||
10291 | unsigned NumInits = E->getNumInits(); | |||
10292 | unsigned NumElements = VT->getNumElements(); | |||
10293 | ||||
10294 | QualType EltTy = VT->getElementType(); | |||
10295 | SmallVector<APValue, 4> Elements; | |||
10296 | ||||
10297 | // The number of initializers can be less than the number of | |||
10298 | // vector elements. For OpenCL, this can be due to nested vector | |||
10299 | // initialization. For GCC compatibility, missing trailing elements | |||
10300 | // should be initialized with zeroes. | |||
10301 | unsigned CountInits = 0, CountElts = 0; | |||
10302 | while (CountElts < NumElements) { | |||
10303 | // Handle nested vector initialization. | |||
10304 | if (CountInits < NumInits | |||
10305 | && E->getInit(CountInits)->getType()->isVectorType()) { | |||
10306 | APValue v; | |||
10307 | if (!EvaluateVector(E->getInit(CountInits), v, Info)) | |||
10308 | return Error(E); | |||
10309 | unsigned vlen = v.getVectorLength(); | |||
10310 | for (unsigned j = 0; j < vlen; j++) | |||
10311 | Elements.push_back(v.getVectorElt(j)); | |||
10312 | CountElts += vlen; | |||
10313 | } else if (EltTy->isIntegerType()) { | |||
10314 | llvm::APSInt sInt(32); | |||
10315 | if (CountInits < NumInits) { | |||
10316 | if (!EvaluateInteger(E->getInit(CountInits), sInt, Info)) | |||
10317 | return false; | |||
10318 | } else // trailing integer zero. | |||
10319 | sInt = Info.Ctx.MakeIntValue(0, EltTy); | |||
10320 | Elements.push_back(APValue(sInt)); | |||
10321 | CountElts++; | |||
10322 | } else { | |||
10323 | llvm::APFloat f(0.0); | |||
10324 | if (CountInits < NumInits) { | |||
10325 | if (!EvaluateFloat(E->getInit(CountInits), f, Info)) | |||
10326 | return false; | |||
10327 | } else // trailing float zero. | |||
10328 | f = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy)); | |||
10329 | Elements.push_back(APValue(f)); | |||
10330 | CountElts++; | |||
10331 | } | |||
10332 | CountInits++; | |||
10333 | } | |||
10334 | return Success(Elements, E); | |||
10335 | } | |||
10336 | ||||
10337 | bool | |||
10338 | VectorExprEvaluator::ZeroInitialization(const Expr *E) { | |||
10339 | const auto *VT = E->getType()->castAs<VectorType>(); | |||
10340 | QualType EltTy = VT->getElementType(); | |||
10341 | APValue ZeroElement; | |||
10342 | if (EltTy->isIntegerType()) | |||
10343 | ZeroElement = APValue(Info.Ctx.MakeIntValue(0, EltTy)); | |||
10344 | else | |||
10345 | ZeroElement = | |||
10346 | APValue(APFloat::getZero(Info.Ctx.getFloatTypeSemantics(EltTy))); | |||
10347 | ||||
10348 | SmallVector<APValue, 4> Elements(VT->getNumElements(), ZeroElement); | |||
10349 | return Success(Elements, E); | |||
10350 | } | |||
10351 | ||||
10352 | bool VectorExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { | |||
10353 | VisitIgnoredValue(E->getSubExpr()); | |||
10354 | return ZeroInitialization(E); | |||
10355 | } | |||
10356 | ||||
10357 | bool VectorExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | |||
10358 | BinaryOperatorKind Op = E->getOpcode(); | |||
10359 | assert(Op != BO_PtrMemD && Op != BO_PtrMemI && Op != BO_Cmp &&(static_cast <bool> (Op != BO_PtrMemD && Op != BO_PtrMemI && Op != BO_Cmp && "Operation not supported on vector types" ) ? void (0) : __assert_fail ("Op != BO_PtrMemD && Op != BO_PtrMemI && Op != BO_Cmp && \"Operation not supported on vector types\"" , "clang/lib/AST/ExprConstant.cpp", 10360, __extension__ __PRETTY_FUNCTION__ )) | |||
10360 | "Operation not supported on vector types")(static_cast <bool> (Op != BO_PtrMemD && Op != BO_PtrMemI && Op != BO_Cmp && "Operation not supported on vector types" ) ? void (0) : __assert_fail ("Op != BO_PtrMemD && Op != BO_PtrMemI && Op != BO_Cmp && \"Operation not supported on vector types\"" , "clang/lib/AST/ExprConstant.cpp", 10360, __extension__ __PRETTY_FUNCTION__ )); | |||
10361 | ||||
10362 | if (Op == BO_Comma) | |||
10363 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | |||
10364 | ||||
10365 | Expr *LHS = E->getLHS(); | |||
10366 | Expr *RHS = E->getRHS(); | |||
10367 | ||||
10368 | assert(LHS->getType()->isVectorType() && RHS->getType()->isVectorType() &&(static_cast <bool> (LHS->getType()->isVectorType () && RHS->getType()->isVectorType() && "Must both be vector types") ? void (0) : __assert_fail ("LHS->getType()->isVectorType() && RHS->getType()->isVectorType() && \"Must both be vector types\"" , "clang/lib/AST/ExprConstant.cpp", 10369, __extension__ __PRETTY_FUNCTION__ )) | |||
10369 | "Must both be vector types")(static_cast <bool> (LHS->getType()->isVectorType () && RHS->getType()->isVectorType() && "Must both be vector types") ? void (0) : __assert_fail ("LHS->getType()->isVectorType() && RHS->getType()->isVectorType() && \"Must both be vector types\"" , "clang/lib/AST/ExprConstant.cpp", 10369, __extension__ __PRETTY_FUNCTION__ )); | |||
10370 | // Checking JUST the types are the same would be fine, except shifts don't | |||
10371 | // need to have their types be the same (since you always shift by an int). | |||
10372 | assert(LHS->getType()->castAs<VectorType>()->getNumElements() ==(static_cast <bool> (LHS->getType()->castAs<VectorType >()->getNumElements() == E->getType()->castAs< VectorType>()->getNumElements() && RHS->getType ()->castAs<VectorType>()->getNumElements() == E-> getType()->castAs<VectorType>()->getNumElements() && "All operands must be the same size.") ? void (0) : __assert_fail ("LHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && RHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && \"All operands must be the same size.\"" , "clang/lib/AST/ExprConstant.cpp", 10376, __extension__ __PRETTY_FUNCTION__ )) | |||
10373 | E->getType()->castAs<VectorType>()->getNumElements() &&(static_cast <bool> (LHS->getType()->castAs<VectorType >()->getNumElements() == E->getType()->castAs< VectorType>()->getNumElements() && RHS->getType ()->castAs<VectorType>()->getNumElements() == E-> getType()->castAs<VectorType>()->getNumElements() && "All operands must be the same size.") ? void (0) : __assert_fail ("LHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && RHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && \"All operands must be the same size.\"" , "clang/lib/AST/ExprConstant.cpp", 10376, __extension__ __PRETTY_FUNCTION__ )) | |||
10374 | RHS->getType()->castAs<VectorType>()->getNumElements() ==(static_cast <bool> (LHS->getType()->castAs<VectorType >()->getNumElements() == E->getType()->castAs< VectorType>()->getNumElements() && RHS->getType ()->castAs<VectorType>()->getNumElements() == E-> getType()->castAs<VectorType>()->getNumElements() && "All operands must be the same size.") ? void (0) : __assert_fail ("LHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && RHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && \"All operands must be the same size.\"" , "clang/lib/AST/ExprConstant.cpp", 10376, __extension__ __PRETTY_FUNCTION__ )) | |||
10375 | E->getType()->castAs<VectorType>()->getNumElements() &&(static_cast <bool> (LHS->getType()->castAs<VectorType >()->getNumElements() == E->getType()->castAs< VectorType>()->getNumElements() && RHS->getType ()->castAs<VectorType>()->getNumElements() == E-> getType()->castAs<VectorType>()->getNumElements() && "All operands must be the same size.") ? void (0) : __assert_fail ("LHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && RHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && \"All operands must be the same size.\"" , "clang/lib/AST/ExprConstant.cpp", 10376, __extension__ __PRETTY_FUNCTION__ )) | |||
10376 | "All operands must be the same size.")(static_cast <bool> (LHS->getType()->castAs<VectorType >()->getNumElements() == E->getType()->castAs< VectorType>()->getNumElements() && RHS->getType ()->castAs<VectorType>()->getNumElements() == E-> getType()->castAs<VectorType>()->getNumElements() && "All operands must be the same size.") ? void (0) : __assert_fail ("LHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && RHS->getType()->castAs<VectorType>()->getNumElements() == E->getType()->castAs<VectorType>()->getNumElements() && \"All operands must be the same size.\"" , "clang/lib/AST/ExprConstant.cpp", 10376, __extension__ __PRETTY_FUNCTION__ )); | |||
10377 | ||||
10378 | APValue LHSValue; | |||
10379 | APValue RHSValue; | |||
10380 | bool LHSOK = Evaluate(LHSValue, Info, LHS); | |||
10381 | if (!LHSOK && !Info.noteFailure()) | |||
10382 | return false; | |||
10383 | if (!Evaluate(RHSValue, Info, RHS) || !LHSOK) | |||
10384 | return false; | |||
10385 | ||||
10386 | if (!handleVectorVectorBinOp(Info, E, Op, LHSValue, RHSValue)) | |||
10387 | return false; | |||
10388 | ||||
10389 | return Success(LHSValue, E); | |||
10390 | } | |||
10391 | ||||
10392 | static llvm::Optional<APValue> handleVectorUnaryOperator(ASTContext &Ctx, | |||
10393 | QualType ResultTy, | |||
10394 | UnaryOperatorKind Op, | |||
10395 | APValue Elt) { | |||
10396 | switch (Op) { | |||
10397 | case UO_Plus: | |||
10398 | // Nothing to do here. | |||
10399 | return Elt; | |||
10400 | case UO_Minus: | |||
10401 | if (Elt.getKind() == APValue::Int) { | |||
10402 | Elt.getInt().negate(); | |||
10403 | } else { | |||
10404 | assert(Elt.getKind() == APValue::Float &&(static_cast <bool> (Elt.getKind() == APValue::Float && "Vector can only be int or float type") ? void (0) : __assert_fail ("Elt.getKind() == APValue::Float && \"Vector can only be int or float type\"" , "clang/lib/AST/ExprConstant.cpp", 10405, __extension__ __PRETTY_FUNCTION__ )) | |||
10405 | "Vector can only be int or float type")(static_cast <bool> (Elt.getKind() == APValue::Float && "Vector can only be int or float type") ? void (0) : __assert_fail ("Elt.getKind() == APValue::Float && \"Vector can only be int or float type\"" , "clang/lib/AST/ExprConstant.cpp", 10405, __extension__ __PRETTY_FUNCTION__ )); | |||
10406 | Elt.getFloat().changeSign(); | |||
10407 | } | |||
10408 | return Elt; | |||
10409 | case UO_Not: | |||
10410 | // This is only valid for integral types anyway, so we don't have to handle | |||
10411 | // float here. | |||
10412 | assert(Elt.getKind() == APValue::Int &&(static_cast <bool> (Elt.getKind() == APValue::Int && "Vector operator ~ can only be int") ? void (0) : __assert_fail ("Elt.getKind() == APValue::Int && \"Vector operator ~ can only be int\"" , "clang/lib/AST/ExprConstant.cpp", 10413, __extension__ __PRETTY_FUNCTION__ )) | |||
10413 | "Vector operator ~ can only be int")(static_cast <bool> (Elt.getKind() == APValue::Int && "Vector operator ~ can only be int") ? void (0) : __assert_fail ("Elt.getKind() == APValue::Int && \"Vector operator ~ can only be int\"" , "clang/lib/AST/ExprConstant.cpp", 10413, __extension__ __PRETTY_FUNCTION__ )); | |||
10414 | Elt.getInt().flipAllBits(); | |||
10415 | return Elt; | |||
10416 | case UO_LNot: { | |||
10417 | if (Elt.getKind() == APValue::Int) { | |||
10418 | Elt.getInt() = !Elt.getInt(); | |||
10419 | // operator ! on vectors returns -1 for 'truth', so negate it. | |||
10420 | Elt.getInt().negate(); | |||
10421 | return Elt; | |||
10422 | } | |||
10423 | assert(Elt.getKind() == APValue::Float &&(static_cast <bool> (Elt.getKind() == APValue::Float && "Vector can only be int or float type") ? void (0) : __assert_fail ("Elt.getKind() == APValue::Float && \"Vector can only be int or float type\"" , "clang/lib/AST/ExprConstant.cpp", 10424, __extension__ __PRETTY_FUNCTION__ )) | |||
10424 | "Vector can only be int or float type")(static_cast <bool> (Elt.getKind() == APValue::Float && "Vector can only be int or float type") ? void (0) : __assert_fail ("Elt.getKind() == APValue::Float && \"Vector can only be int or float type\"" , "clang/lib/AST/ExprConstant.cpp", 10424, __extension__ __PRETTY_FUNCTION__ )); | |||
10425 | // Float types result in an int of the same size, but -1 for true, or 0 for | |||
10426 | // false. | |||
10427 | APSInt EltResult{Ctx.getIntWidth(ResultTy), | |||
10428 | ResultTy->isUnsignedIntegerType()}; | |||
10429 | if (Elt.getFloat().isZero()) | |||
10430 | EltResult.setAllBits(); | |||
10431 | else | |||
10432 | EltResult.clearAllBits(); | |||
10433 | ||||
10434 | return APValue{EltResult}; | |||
10435 | } | |||
10436 | default: | |||
10437 | // FIXME: Implement the rest of the unary operators. | |||
10438 | return llvm::None; | |||
10439 | } | |||
10440 | } | |||
10441 | ||||
10442 | bool VectorExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { | |||
10443 | Expr *SubExpr = E->getSubExpr(); | |||
10444 | const auto *VD = SubExpr->getType()->castAs<VectorType>(); | |||
10445 | // This result element type differs in the case of negating a floating point | |||
10446 | // vector, since the result type is the a vector of the equivilant sized | |||
10447 | // integer. | |||
10448 | const QualType ResultEltTy = VD->getElementType(); | |||
10449 | UnaryOperatorKind Op = E->getOpcode(); | |||
10450 | ||||
10451 | APValue SubExprValue; | |||
10452 | if (!Evaluate(SubExprValue, Info, SubExpr)) | |||
10453 | return false; | |||
10454 | ||||
10455 | // FIXME: This vector evaluator someday needs to be changed to be LValue | |||
10456 | // aware/keep LValue information around, rather than dealing with just vector | |||
10457 | // types directly. Until then, we cannot handle cases where the operand to | |||
10458 | // these unary operators is an LValue. The only case I've been able to see | |||
10459 | // cause this is operator++ assigning to a member expression (only valid in | |||
10460 | // altivec compilations) in C mode, so this shouldn't limit us too much. | |||
10461 | if (SubExprValue.isLValue()) | |||
10462 | return false; | |||
10463 | ||||
10464 | assert(SubExprValue.getVectorLength() == VD->getNumElements() &&(static_cast <bool> (SubExprValue.getVectorLength() == VD ->getNumElements() && "Vector length doesn't match type?" ) ? void (0) : __assert_fail ("SubExprValue.getVectorLength() == VD->getNumElements() && \"Vector length doesn't match type?\"" , "clang/lib/AST/ExprConstant.cpp", 10465, __extension__ __PRETTY_FUNCTION__ )) | |||
10465 | "Vector length doesn't match type?")(static_cast <bool> (SubExprValue.getVectorLength() == VD ->getNumElements() && "Vector length doesn't match type?" ) ? void (0) : __assert_fail ("SubExprValue.getVectorLength() == VD->getNumElements() && \"Vector length doesn't match type?\"" , "clang/lib/AST/ExprConstant.cpp", 10465, __extension__ __PRETTY_FUNCTION__ )); | |||
10466 | ||||
10467 | SmallVector<APValue, 4> ResultElements; | |||
10468 | for (unsigned EltNum = 0; EltNum < VD->getNumElements(); ++EltNum) { | |||
10469 | llvm::Optional<APValue> Elt = handleVectorUnaryOperator( | |||
10470 | Info.Ctx, ResultEltTy, Op, SubExprValue.getVectorElt(EltNum)); | |||
10471 | if (!Elt) | |||
10472 | return false; | |||
10473 | ResultElements.push_back(*Elt); | |||
10474 | } | |||
10475 | return Success(APValue(ResultElements.data(), ResultElements.size()), E); | |||
10476 | } | |||
10477 | ||||
10478 | //===----------------------------------------------------------------------===// | |||
10479 | // Array Evaluation | |||
10480 | //===----------------------------------------------------------------------===// | |||
10481 | ||||
10482 | namespace { | |||
10483 | class ArrayExprEvaluator | |||
10484 | : public ExprEvaluatorBase<ArrayExprEvaluator> { | |||
10485 | const LValue &This; | |||
10486 | APValue &Result; | |||
10487 | public: | |||
10488 | ||||
10489 | ArrayExprEvaluator(EvalInfo &Info, const LValue &This, APValue &Result) | |||
10490 | : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} | |||
10491 | ||||
10492 | bool Success(const APValue &V, const Expr *E) { | |||
10493 | assert(V.isArray() && "expected array")(static_cast <bool> (V.isArray() && "expected array" ) ? void (0) : __assert_fail ("V.isArray() && \"expected array\"" , "clang/lib/AST/ExprConstant.cpp", 10493, __extension__ __PRETTY_FUNCTION__ )); | |||
10494 | Result = V; | |||
10495 | return true; | |||
10496 | } | |||
10497 | ||||
10498 | bool ZeroInitialization(const Expr *E) { | |||
10499 | const ConstantArrayType *CAT = | |||
10500 | Info.Ctx.getAsConstantArrayType(E->getType()); | |||
10501 | if (!CAT) { | |||
10502 | if (E->getType()->isIncompleteArrayType()) { | |||
10503 | // We can be asked to zero-initialize a flexible array member; this | |||
10504 | // is represented as an ImplicitValueInitExpr of incomplete array | |||
10505 | // type. In this case, the array has zero elements. | |||
10506 | Result = APValue(APValue::UninitArray(), 0, 0); | |||
10507 | return true; | |||
10508 | } | |||
10509 | // FIXME: We could handle VLAs here. | |||
10510 | return Error(E); | |||
10511 | } | |||
10512 | ||||
10513 | Result = APValue(APValue::UninitArray(), 0, | |||
10514 | CAT->getSize().getZExtValue()); | |||
10515 | if (!Result.hasArrayFiller()) | |||
10516 | return true; | |||
10517 | ||||
10518 | // Zero-initialize all elements. | |||
10519 | LValue Subobject = This; | |||
10520 | Subobject.addArray(Info, E, CAT); | |||
10521 | ImplicitValueInitExpr VIE(CAT->getElementType()); | |||
10522 | return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, &VIE); | |||
10523 | } | |||
10524 | ||||
10525 | bool VisitCallExpr(const CallExpr *E) { | |||
10526 | return handleCallExpr(E, Result, &This); | |||
10527 | } | |||
10528 | bool VisitInitListExpr(const InitListExpr *E, | |||
10529 | QualType AllocType = QualType()); | |||
10530 | bool VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E); | |||
10531 | bool VisitCXXConstructExpr(const CXXConstructExpr *E); | |||
10532 | bool VisitCXXConstructExpr(const CXXConstructExpr *E, | |||
10533 | const LValue &Subobject, | |||
10534 | APValue *Value, QualType Type); | |||
10535 | bool VisitStringLiteral(const StringLiteral *E, | |||
10536 | QualType AllocType = QualType()) { | |||
10537 | expandStringLiteral(Info, E, Result, AllocType); | |||
10538 | return true; | |||
10539 | } | |||
10540 | }; | |||
10541 | } // end anonymous namespace | |||
10542 | ||||
10543 | static bool EvaluateArray(const Expr *E, const LValue &This, | |||
10544 | APValue &Result, EvalInfo &Info) { | |||
10545 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 10545, __extension__ __PRETTY_FUNCTION__)); | |||
10546 | assert(E->isPRValue() && E->getType()->isArrayType() &&(static_cast <bool> (E->isPRValue() && E-> getType()->isArrayType() && "not an array prvalue" ) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isArrayType() && \"not an array prvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10547, __extension__ __PRETTY_FUNCTION__ )) | |||
10547 | "not an array prvalue")(static_cast <bool> (E->isPRValue() && E-> getType()->isArrayType() && "not an array prvalue" ) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isArrayType() && \"not an array prvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10547, __extension__ __PRETTY_FUNCTION__ )); | |||
10548 | return ArrayExprEvaluator(Info, This, Result).Visit(E); | |||
10549 | } | |||
10550 | ||||
10551 | static bool EvaluateArrayNewInitList(EvalInfo &Info, LValue &This, | |||
10552 | APValue &Result, const InitListExpr *ILE, | |||
10553 | QualType AllocType) { | |||
10554 | assert(!ILE->isValueDependent())(static_cast <bool> (!ILE->isValueDependent()) ? void (0) : __assert_fail ("!ILE->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 10554, __extension__ __PRETTY_FUNCTION__)); | |||
10555 | assert(ILE->isPRValue() && ILE->getType()->isArrayType() &&(static_cast <bool> (ILE->isPRValue() && ILE ->getType()->isArrayType() && "not an array prvalue" ) ? void (0) : __assert_fail ("ILE->isPRValue() && ILE->getType()->isArrayType() && \"not an array prvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10556, __extension__ __PRETTY_FUNCTION__ )) | |||
10556 | "not an array prvalue")(static_cast <bool> (ILE->isPRValue() && ILE ->getType()->isArrayType() && "not an array prvalue" ) ? void (0) : __assert_fail ("ILE->isPRValue() && ILE->getType()->isArrayType() && \"not an array prvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10556, __extension__ __PRETTY_FUNCTION__ )); | |||
10557 | return ArrayExprEvaluator(Info, This, Result) | |||
10558 | .VisitInitListExpr(ILE, AllocType); | |||
10559 | } | |||
10560 | ||||
10561 | static bool EvaluateArrayNewConstructExpr(EvalInfo &Info, LValue &This, | |||
10562 | APValue &Result, | |||
10563 | const CXXConstructExpr *CCE, | |||
10564 | QualType AllocType) { | |||
10565 | assert(!CCE->isValueDependent())(static_cast <bool> (!CCE->isValueDependent()) ? void (0) : __assert_fail ("!CCE->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 10565, __extension__ __PRETTY_FUNCTION__)); | |||
10566 | assert(CCE->isPRValue() && CCE->getType()->isArrayType() &&(static_cast <bool> (CCE->isPRValue() && CCE ->getType()->isArrayType() && "not an array prvalue" ) ? void (0) : __assert_fail ("CCE->isPRValue() && CCE->getType()->isArrayType() && \"not an array prvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10567, __extension__ __PRETTY_FUNCTION__ )) | |||
10567 | "not an array prvalue")(static_cast <bool> (CCE->isPRValue() && CCE ->getType()->isArrayType() && "not an array prvalue" ) ? void (0) : __assert_fail ("CCE->isPRValue() && CCE->getType()->isArrayType() && \"not an array prvalue\"" , "clang/lib/AST/ExprConstant.cpp", 10567, __extension__ __PRETTY_FUNCTION__ )); | |||
10568 | return ArrayExprEvaluator(Info, This, Result) | |||
10569 | .VisitCXXConstructExpr(CCE, This, &Result, AllocType); | |||
10570 | } | |||
10571 | ||||
10572 | // Return true iff the given array filler may depend on the element index. | |||
10573 | static bool MaybeElementDependentArrayFiller(const Expr *FillerExpr) { | |||
10574 | // For now, just allow non-class value-initialization and initialization | |||
10575 | // lists comprised of them. | |||
10576 | if (isa<ImplicitValueInitExpr>(FillerExpr)) | |||
10577 | return false; | |||
10578 | if (const InitListExpr *ILE = dyn_cast<InitListExpr>(FillerExpr)) { | |||
10579 | for (unsigned I = 0, E = ILE->getNumInits(); I != E; ++I) { | |||
10580 | if (MaybeElementDependentArrayFiller(ILE->getInit(I))) | |||
10581 | return true; | |||
10582 | } | |||
10583 | return false; | |||
10584 | } | |||
10585 | return true; | |||
10586 | } | |||
10587 | ||||
10588 | bool ArrayExprEvaluator::VisitInitListExpr(const InitListExpr *E, | |||
10589 | QualType AllocType) { | |||
10590 | const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType( | |||
10591 | AllocType.isNull() ? E->getType() : AllocType); | |||
10592 | if (!CAT) | |||
10593 | return Error(E); | |||
10594 | ||||
10595 | // C++11 [dcl.init.string]p1: A char array [...] can be initialized by [...] | |||
10596 | // an appropriately-typed string literal enclosed in braces. | |||
10597 | if (E->isStringLiteralInit()) { | |||
10598 | auto *SL = dyn_cast<StringLiteral>(E->getInit(0)->IgnoreParenImpCasts()); | |||
10599 | // FIXME: Support ObjCEncodeExpr here once we support it in | |||
10600 | // ArrayExprEvaluator generally. | |||
10601 | if (!SL) | |||
10602 | return Error(E); | |||
10603 | return VisitStringLiteral(SL, AllocType); | |||
10604 | } | |||
10605 | // Any other transparent list init will need proper handling of the | |||
10606 | // AllocType; we can't just recurse to the inner initializer. | |||
10607 | assert(!E->isTransparent() &&(static_cast <bool> (!E->isTransparent() && "transparent array list initialization is not string literal init?" ) ? void (0) : __assert_fail ("!E->isTransparent() && \"transparent array list initialization is not string literal init?\"" , "clang/lib/AST/ExprConstant.cpp", 10608, __extension__ __PRETTY_FUNCTION__ )) | |||
10608 | "transparent array list initialization is not string literal init?")(static_cast <bool> (!E->isTransparent() && "transparent array list initialization is not string literal init?" ) ? void (0) : __assert_fail ("!E->isTransparent() && \"transparent array list initialization is not string literal init?\"" , "clang/lib/AST/ExprConstant.cpp", 10608, __extension__ __PRETTY_FUNCTION__ )); | |||
10609 | ||||
10610 | bool Success = true; | |||
10611 | ||||
10612 | assert((!Result.isArray() || Result.getArrayInitializedElts() == 0) &&(static_cast <bool> ((!Result.isArray() || Result.getArrayInitializedElts () == 0) && "zero-initialized array shouldn't have any initialized elts" ) ? void (0) : __assert_fail ("(!Result.isArray() || Result.getArrayInitializedElts() == 0) && \"zero-initialized array shouldn't have any initialized elts\"" , "clang/lib/AST/ExprConstant.cpp", 10613, __extension__ __PRETTY_FUNCTION__ )) | |||
10613 | "zero-initialized array shouldn't have any initialized elts")(static_cast <bool> ((!Result.isArray() || Result.getArrayInitializedElts () == 0) && "zero-initialized array shouldn't have any initialized elts" ) ? void (0) : __assert_fail ("(!Result.isArray() || Result.getArrayInitializedElts() == 0) && \"zero-initialized array shouldn't have any initialized elts\"" , "clang/lib/AST/ExprConstant.cpp", 10613, __extension__ __PRETTY_FUNCTION__ )); | |||
10614 | APValue Filler; | |||
10615 | if (Result.isArray() && Result.hasArrayFiller()) | |||
10616 | Filler = Result.getArrayFiller(); | |||
10617 | ||||
10618 | unsigned NumEltsToInit = E->getNumInits(); | |||
10619 | unsigned NumElts = CAT->getSize().getZExtValue(); | |||
10620 | const Expr *FillerExpr = E->hasArrayFiller() ? E->getArrayFiller() : nullptr; | |||
10621 | ||||
10622 | // If the initializer might depend on the array index, run it for each | |||
10623 | // array element. | |||
10624 | if (NumEltsToInit != NumElts && MaybeElementDependentArrayFiller(FillerExpr)) | |||
10625 | NumEltsToInit = NumElts; | |||
10626 | ||||
10627 | 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) | |||
10628 | << NumEltsToInit << ".\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("exprconstant")) { llvm::dbgs() << "The number of elements to initialize: " << NumEltsToInit << ".\n"; } } while (false); | |||
10629 | ||||
10630 | Result = APValue(APValue::UninitArray(), NumEltsToInit, NumElts); | |||
10631 | ||||
10632 | // If the array was previously zero-initialized, preserve the | |||
10633 | // zero-initialized values. | |||
10634 | if (Filler.hasValue()) { | |||
10635 | for (unsigned I = 0, E = Result.getArrayInitializedElts(); I != E; ++I) | |||
10636 | Result.getArrayInitializedElt(I) = Filler; | |||
10637 | if (Result.hasArrayFiller()) | |||
10638 | Result.getArrayFiller() = Filler; | |||
10639 | } | |||
10640 | ||||
10641 | LValue Subobject = This; | |||
10642 | Subobject.addArray(Info, E, CAT); | |||
10643 | for (unsigned Index = 0; Index != NumEltsToInit; ++Index) { | |||
10644 | const Expr *Init = | |||
10645 | Index < E->getNumInits() ? E->getInit(Index) : FillerExpr; | |||
10646 | if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), | |||
10647 | Info, Subobject, Init) || | |||
10648 | !HandleLValueArrayAdjustment(Info, Init, Subobject, | |||
10649 | CAT->getElementType(), 1)) { | |||
10650 | if (!Info.noteFailure()) | |||
10651 | return false; | |||
10652 | Success = false; | |||
10653 | } | |||
10654 | } | |||
10655 | ||||
10656 | if (!Result.hasArrayFiller()) | |||
10657 | return Success; | |||
10658 | ||||
10659 | // If we get here, we have a trivial filler, which we can just evaluate | |||
10660 | // once and splat over the rest of the array elements. | |||
10661 | assert(FillerExpr && "no array filler for incomplete init list")(static_cast <bool> (FillerExpr && "no array filler for incomplete init list" ) ? void (0) : __assert_fail ("FillerExpr && \"no array filler for incomplete init list\"" , "clang/lib/AST/ExprConstant.cpp", 10661, __extension__ __PRETTY_FUNCTION__ )); | |||
10662 | return EvaluateInPlace(Result.getArrayFiller(), Info, Subobject, | |||
10663 | FillerExpr) && Success; | |||
10664 | } | |||
10665 | ||||
10666 | bool ArrayExprEvaluator::VisitArrayInitLoopExpr(const ArrayInitLoopExpr *E) { | |||
10667 | LValue CommonLV; | |||
10668 | if (E->getCommonExpr() && | |||
10669 | !Evaluate(Info.CurrentCall->createTemporary( | |||
10670 | E->getCommonExpr(), | |||
10671 | getStorageType(Info.Ctx, E->getCommonExpr()), | |||
10672 | ScopeKind::FullExpression, CommonLV), | |||
10673 | Info, E->getCommonExpr()->getSourceExpr())) | |||
10674 | return false; | |||
10675 | ||||
10676 | auto *CAT = cast<ConstantArrayType>(E->getType()->castAsArrayTypeUnsafe()); | |||
10677 | ||||
10678 | uint64_t Elements = CAT->getSize().getZExtValue(); | |||
10679 | Result = APValue(APValue::UninitArray(), Elements, Elements); | |||
10680 | ||||
10681 | LValue Subobject = This; | |||
10682 | Subobject.addArray(Info, E, CAT); | |||
10683 | ||||
10684 | bool Success = true; | |||
10685 | for (EvalInfo::ArrayInitLoopIndex Index(Info); Index != Elements; ++Index) { | |||
10686 | if (!EvaluateInPlace(Result.getArrayInitializedElt(Index), | |||
10687 | Info, Subobject, E->getSubExpr()) || | |||
10688 | !HandleLValueArrayAdjustment(Info, E, Subobject, | |||
10689 | CAT->getElementType(), 1)) { | |||
10690 | if (!Info.noteFailure()) | |||
10691 | return false; | |||
10692 | Success = false; | |||
10693 | } | |||
10694 | } | |||
10695 | ||||
10696 | return Success; | |||
10697 | } | |||
10698 | ||||
10699 | bool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) { | |||
10700 | return VisitCXXConstructExpr(E, This, &Result, E->getType()); | |||
10701 | } | |||
10702 | ||||
10703 | bool ArrayExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E, | |||
10704 | const LValue &Subobject, | |||
10705 | APValue *Value, | |||
10706 | QualType Type) { | |||
10707 | bool HadZeroInit = Value->hasValue(); | |||
10708 | ||||
10709 | if (const ConstantArrayType *CAT = Info.Ctx.getAsConstantArrayType(Type)) { | |||
10710 | unsigned FinalSize = CAT->getSize().getZExtValue(); | |||
10711 | ||||
10712 | // Preserve the array filler if we had prior zero-initialization. | |||
10713 | APValue Filler = | |||
10714 | HadZeroInit && Value->hasArrayFiller() ? Value->getArrayFiller() | |||
10715 | : APValue(); | |||
10716 | ||||
10717 | *Value = APValue(APValue::UninitArray(), 0, FinalSize); | |||
10718 | if (FinalSize == 0) | |||
10719 | return true; | |||
10720 | ||||
10721 | LValue ArrayElt = Subobject; | |||
10722 | ArrayElt.addArray(Info, E, CAT); | |||
10723 | // We do the whole initialization in two passes, first for just one element, | |||
10724 | // then for the whole array. It's possible we may find out we can't do const | |||
10725 | // init in the first pass, in which case we avoid allocating a potentially | |||
10726 | // large array. We don't do more passes because expanding array requires | |||
10727 | // copying the data, which is wasteful. | |||
10728 | for (const unsigned N : {1u, FinalSize}) { | |||
10729 | unsigned OldElts = Value->getArrayInitializedElts(); | |||
10730 | if (OldElts == N) | |||
10731 | break; | |||
10732 | ||||
10733 | // Expand the array to appropriate size. | |||
10734 | APValue NewValue(APValue::UninitArray(), N, FinalSize); | |||
10735 | for (unsigned I = 0; I < OldElts; ++I) | |||
10736 | NewValue.getArrayInitializedElt(I).swap( | |||
10737 | Value->getArrayInitializedElt(I)); | |||
10738 | Value->swap(NewValue); | |||
10739 | ||||
10740 | if (HadZeroInit) | |||
10741 | for (unsigned I = OldElts; I < N; ++I) | |||
10742 | Value->getArrayInitializedElt(I) = Filler; | |||
10743 | ||||
10744 | // Initialize the elements. | |||
10745 | for (unsigned I = OldElts; I < N; ++I) { | |||
10746 | if (!VisitCXXConstructExpr(E, ArrayElt, | |||
10747 | &Value->getArrayInitializedElt(I), | |||
10748 | CAT->getElementType()) || | |||
10749 | !HandleLValueArrayAdjustment(Info, E, ArrayElt, | |||
10750 | CAT->getElementType(), 1)) | |||
10751 | return false; | |||
10752 | // When checking for const initilization any diagnostic is considered | |||
10753 | // an error. | |||
10754 | if (Info.EvalStatus.Diag && !Info.EvalStatus.Diag->empty() && | |||
10755 | !Info.keepEvaluatingAfterFailure()) | |||
10756 | return false; | |||
10757 | } | |||
10758 | } | |||
10759 | ||||
10760 | return true; | |||
10761 | } | |||
10762 | ||||
10763 | if (!Type->isRecordType()) | |||
10764 | return Error(E); | |||
10765 | ||||
10766 | return RecordExprEvaluator(Info, Subobject, *Value) | |||
10767 | .VisitCXXConstructExpr(E, Type); | |||
10768 | } | |||
10769 | ||||
10770 | //===----------------------------------------------------------------------===// | |||
10771 | // Integer Evaluation | |||
10772 | // | |||
10773 | // As a GNU extension, we support casting pointers to sufficiently-wide integer | |||
10774 | // types and back in constant folding. Integer values are thus represented | |||
10775 | // either as an integer-valued APValue, or as an lvalue-valued APValue. | |||
10776 | //===----------------------------------------------------------------------===// | |||
10777 | ||||
10778 | namespace { | |||
10779 | class IntExprEvaluator | |||
10780 | : public ExprEvaluatorBase<IntExprEvaluator> { | |||
10781 | APValue &Result; | |||
10782 | public: | |||
10783 | IntExprEvaluator(EvalInfo &info, APValue &result) | |||
10784 | : ExprEvaluatorBaseTy(info), Result(result) {} | |||
10785 | ||||
10786 | bool Success(const llvm::APSInt &SI, const Expr *E, APValue &Result) { | |||
10787 | assert(E->getType()->isIntegralOrEnumerationType() &&(static_cast <bool> (E->getType()->isIntegralOrEnumerationType () && "Invalid evaluation result.") ? void (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10788, __extension__ __PRETTY_FUNCTION__ )) | |||
10788 | "Invalid evaluation result.")(static_cast <bool> (E->getType()->isIntegralOrEnumerationType () && "Invalid evaluation result.") ? void (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10788, __extension__ __PRETTY_FUNCTION__ )); | |||
10789 | assert(SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() &&(static_cast <bool> (SI.isSigned() == E->getType()-> isSignedIntegerOrEnumerationType() && "Invalid evaluation result." ) ? void (0) : __assert_fail ("SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10790, __extension__ __PRETTY_FUNCTION__ )) | |||
10790 | "Invalid evaluation result.")(static_cast <bool> (SI.isSigned() == E->getType()-> isSignedIntegerOrEnumerationType() && "Invalid evaluation result." ) ? void (0) : __assert_fail ("SI.isSigned() == E->getType()->isSignedIntegerOrEnumerationType() && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10790, __extension__ __PRETTY_FUNCTION__ )); | |||
10791 | assert(SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&(static_cast <bool> (SI.getBitWidth() == Info.Ctx.getIntWidth (E->getType()) && "Invalid evaluation result.") ? void (0) : __assert_fail ("SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10792, __extension__ __PRETTY_FUNCTION__ )) | |||
10792 | "Invalid evaluation result.")(static_cast <bool> (SI.getBitWidth() == Info.Ctx.getIntWidth (E->getType()) && "Invalid evaluation result.") ? void (0) : __assert_fail ("SI.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10792, __extension__ __PRETTY_FUNCTION__ )); | |||
10793 | Result = APValue(SI); | |||
10794 | return true; | |||
10795 | } | |||
10796 | bool Success(const llvm::APSInt &SI, const Expr *E) { | |||
10797 | return Success(SI, E, Result); | |||
10798 | } | |||
10799 | ||||
10800 | bool Success(const llvm::APInt &I, const Expr *E, APValue &Result) { | |||
10801 | assert(E->getType()->isIntegralOrEnumerationType() &&(static_cast <bool> (E->getType()->isIntegralOrEnumerationType () && "Invalid evaluation result.") ? void (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10802, __extension__ __PRETTY_FUNCTION__ )) | |||
10802 | "Invalid evaluation result.")(static_cast <bool> (E->getType()->isIntegralOrEnumerationType () && "Invalid evaluation result.") ? void (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10802, __extension__ __PRETTY_FUNCTION__ )); | |||
10803 | assert(I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) &&(static_cast <bool> (I.getBitWidth() == Info.Ctx.getIntWidth (E->getType()) && "Invalid evaluation result.") ? void (0) : __assert_fail ("I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10804, __extension__ __PRETTY_FUNCTION__ )) | |||
10804 | "Invalid evaluation result.")(static_cast <bool> (I.getBitWidth() == Info.Ctx.getIntWidth (E->getType()) && "Invalid evaluation result.") ? void (0) : __assert_fail ("I.getBitWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10804, __extension__ __PRETTY_FUNCTION__ )); | |||
10805 | Result = APValue(APSInt(I)); | |||
10806 | Result.getInt().setIsUnsigned( | |||
10807 | E->getType()->isUnsignedIntegerOrEnumerationType()); | |||
10808 | return true; | |||
10809 | } | |||
10810 | bool Success(const llvm::APInt &I, const Expr *E) { | |||
10811 | return Success(I, E, Result); | |||
10812 | } | |||
10813 | ||||
10814 | bool Success(uint64_t Value, const Expr *E, APValue &Result) { | |||
10815 | assert(E->getType()->isIntegralOrEnumerationType() &&(static_cast <bool> (E->getType()->isIntegralOrEnumerationType () && "Invalid evaluation result.") ? void (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10816, __extension__ __PRETTY_FUNCTION__ )) | |||
10816 | "Invalid evaluation result.")(static_cast <bool> (E->getType()->isIntegralOrEnumerationType () && "Invalid evaluation result.") ? void (0) : __assert_fail ("E->getType()->isIntegralOrEnumerationType() && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10816, __extension__ __PRETTY_FUNCTION__ )); | |||
10817 | Result = APValue(Info.Ctx.MakeIntValue(Value, E->getType())); | |||
10818 | return true; | |||
10819 | } | |||
10820 | bool Success(uint64_t Value, const Expr *E) { | |||
10821 | return Success(Value, E, Result); | |||
10822 | } | |||
10823 | ||||
10824 | bool Success(CharUnits Size, const Expr *E) { | |||
10825 | return Success(Size.getQuantity(), E); | |||
10826 | } | |||
10827 | ||||
10828 | bool Success(const APValue &V, const Expr *E) { | |||
10829 | if (V.isLValue() || V.isAddrLabelDiff() || V.isIndeterminate()) { | |||
10830 | Result = V; | |||
10831 | return true; | |||
10832 | } | |||
10833 | return Success(V.getInt(), E); | |||
10834 | } | |||
10835 | ||||
10836 | bool ZeroInitialization(const Expr *E) { return Success(0, E); } | |||
10837 | ||||
10838 | //===--------------------------------------------------------------------===// | |||
10839 | // Visitor Methods | |||
10840 | //===--------------------------------------------------------------------===// | |||
10841 | ||||
10842 | bool VisitIntegerLiteral(const IntegerLiteral *E) { | |||
10843 | return Success(E->getValue(), E); | |||
10844 | } | |||
10845 | bool VisitCharacterLiteral(const CharacterLiteral *E) { | |||
10846 | return Success(E->getValue(), E); | |||
10847 | } | |||
10848 | ||||
10849 | bool CheckReferencedDecl(const Expr *E, const Decl *D); | |||
10850 | bool VisitDeclRefExpr(const DeclRefExpr *E) { | |||
10851 | if (CheckReferencedDecl(E, E->getDecl())) | |||
10852 | return true; | |||
10853 | ||||
10854 | return ExprEvaluatorBaseTy::VisitDeclRefExpr(E); | |||
10855 | } | |||
10856 | bool VisitMemberExpr(const MemberExpr *E) { | |||
10857 | if (CheckReferencedDecl(E, E->getMemberDecl())) { | |||
10858 | VisitIgnoredBaseExpression(E->getBase()); | |||
10859 | return true; | |||
10860 | } | |||
10861 | ||||
10862 | return ExprEvaluatorBaseTy::VisitMemberExpr(E); | |||
10863 | } | |||
10864 | ||||
10865 | bool VisitCallExpr(const CallExpr *E); | |||
10866 | bool VisitBuiltinCallExpr(const CallExpr *E, unsigned BuiltinOp); | |||
10867 | bool VisitBinaryOperator(const BinaryOperator *E); | |||
10868 | bool VisitOffsetOfExpr(const OffsetOfExpr *E); | |||
10869 | bool VisitUnaryOperator(const UnaryOperator *E); | |||
10870 | ||||
10871 | bool VisitCastExpr(const CastExpr* E); | |||
10872 | bool VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E); | |||
10873 | ||||
10874 | bool VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) { | |||
10875 | return Success(E->getValue(), E); | |||
10876 | } | |||
10877 | ||||
10878 | bool VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) { | |||
10879 | return Success(E->getValue(), E); | |||
10880 | } | |||
10881 | ||||
10882 | bool VisitArrayInitIndexExpr(const ArrayInitIndexExpr *E) { | |||
10883 | if (Info.ArrayInitIndex == uint64_t(-1)) { | |||
10884 | // We were asked to evaluate this subexpression independent of the | |||
10885 | // enclosing ArrayInitLoopExpr. We can't do that. | |||
10886 | Info.FFDiag(E); | |||
10887 | return false; | |||
10888 | } | |||
10889 | return Success(Info.ArrayInitIndex, E); | |||
10890 | } | |||
10891 | ||||
10892 | // Note, GNU defines __null as an integer, not a pointer. | |||
10893 | bool VisitGNUNullExpr(const GNUNullExpr *E) { | |||
10894 | return ZeroInitialization(E); | |||
10895 | } | |||
10896 | ||||
10897 | bool VisitTypeTraitExpr(const TypeTraitExpr *E) { | |||
10898 | return Success(E->getValue(), E); | |||
10899 | } | |||
10900 | ||||
10901 | bool VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) { | |||
10902 | return Success(E->getValue(), E); | |||
10903 | } | |||
10904 | ||||
10905 | bool VisitExpressionTraitExpr(const ExpressionTraitExpr *E) { | |||
10906 | return Success(E->getValue(), E); | |||
10907 | } | |||
10908 | ||||
10909 | bool VisitUnaryReal(const UnaryOperator *E); | |||
10910 | bool VisitUnaryImag(const UnaryOperator *E); | |||
10911 | ||||
10912 | bool VisitCXXNoexceptExpr(const CXXNoexceptExpr *E); | |||
10913 | bool VisitSizeOfPackExpr(const SizeOfPackExpr *E); | |||
10914 | bool VisitSourceLocExpr(const SourceLocExpr *E); | |||
10915 | bool VisitConceptSpecializationExpr(const ConceptSpecializationExpr *E); | |||
10916 | bool VisitRequiresExpr(const RequiresExpr *E); | |||
10917 | // FIXME: Missing: array subscript of vector, member of vector | |||
10918 | }; | |||
10919 | ||||
10920 | class FixedPointExprEvaluator | |||
10921 | : public ExprEvaluatorBase<FixedPointExprEvaluator> { | |||
10922 | APValue &Result; | |||
10923 | ||||
10924 | public: | |||
10925 | FixedPointExprEvaluator(EvalInfo &info, APValue &result) | |||
10926 | : ExprEvaluatorBaseTy(info), Result(result) {} | |||
10927 | ||||
10928 | bool Success(const llvm::APInt &I, const Expr *E) { | |||
10929 | return Success( | |||
10930 | APFixedPoint(I, Info.Ctx.getFixedPointSemantics(E->getType())), E); | |||
10931 | } | |||
10932 | ||||
10933 | bool Success(uint64_t Value, const Expr *E) { | |||
10934 | return Success( | |||
10935 | APFixedPoint(Value, Info.Ctx.getFixedPointSemantics(E->getType())), E); | |||
10936 | } | |||
10937 | ||||
10938 | bool Success(const APValue &V, const Expr *E) { | |||
10939 | return Success(V.getFixedPoint(), E); | |||
10940 | } | |||
10941 | ||||
10942 | bool Success(const APFixedPoint &V, const Expr *E) { | |||
10943 | assert(E->getType()->isFixedPointType() && "Invalid evaluation result.")(static_cast <bool> (E->getType()->isFixedPointType () && "Invalid evaluation result.") ? void (0) : __assert_fail ("E->getType()->isFixedPointType() && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10943, __extension__ __PRETTY_FUNCTION__ )); | |||
10944 | assert(V.getWidth() == Info.Ctx.getIntWidth(E->getType()) &&(static_cast <bool> (V.getWidth() == Info.Ctx.getIntWidth (E->getType()) && "Invalid evaluation result.") ? void (0) : __assert_fail ("V.getWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10945, __extension__ __PRETTY_FUNCTION__ )) | |||
10945 | "Invalid evaluation result.")(static_cast <bool> (V.getWidth() == Info.Ctx.getIntWidth (E->getType()) && "Invalid evaluation result.") ? void (0) : __assert_fail ("V.getWidth() == Info.Ctx.getIntWidth(E->getType()) && \"Invalid evaluation result.\"" , "clang/lib/AST/ExprConstant.cpp", 10945, __extension__ __PRETTY_FUNCTION__ )); | |||
10946 | Result = APValue(V); | |||
10947 | return true; | |||
10948 | } | |||
10949 | ||||
10950 | //===--------------------------------------------------------------------===// | |||
10951 | // Visitor Methods | |||
10952 | //===--------------------------------------------------------------------===// | |||
10953 | ||||
10954 | bool VisitFixedPointLiteral(const FixedPointLiteral *E) { | |||
10955 | return Success(E->getValue(), E); | |||
10956 | } | |||
10957 | ||||
10958 | bool VisitCastExpr(const CastExpr *E); | |||
10959 | bool VisitUnaryOperator(const UnaryOperator *E); | |||
10960 | bool VisitBinaryOperator(const BinaryOperator *E); | |||
10961 | }; | |||
10962 | } // end anonymous namespace | |||
10963 | ||||
10964 | /// EvaluateIntegerOrLValue - Evaluate an rvalue integral-typed expression, and | |||
10965 | /// produce either the integer value or a pointer. | |||
10966 | /// | |||
10967 | /// GCC has a heinous extension which folds casts between pointer types and | |||
10968 | /// pointer-sized integral types. We support this by allowing the evaluation of | |||
10969 | /// an integer rvalue to produce a pointer (represented as an lvalue) instead. | |||
10970 | /// Some simple arithmetic on such values is supported (they are treated much | |||
10971 | /// like char*). | |||
10972 | static bool EvaluateIntegerOrLValue(const Expr *E, APValue &Result, | |||
10973 | EvalInfo &Info) { | |||
10974 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 10974, __extension__ __PRETTY_FUNCTION__)); | |||
10975 | assert(E->isPRValue() && E->getType()->isIntegralOrEnumerationType())(static_cast <bool> (E->isPRValue() && E-> getType()->isIntegralOrEnumerationType()) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isIntegralOrEnumerationType()" , "clang/lib/AST/ExprConstant.cpp", 10975, __extension__ __PRETTY_FUNCTION__ )); | |||
10976 | return IntExprEvaluator(Info, Result).Visit(E); | |||
10977 | } | |||
10978 | ||||
10979 | static bool EvaluateInteger(const Expr *E, APSInt &Result, EvalInfo &Info) { | |||
10980 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 10980, __extension__ __PRETTY_FUNCTION__)); | |||
10981 | APValue Val; | |||
10982 | if (!EvaluateIntegerOrLValue(E, Val, Info)) | |||
10983 | return false; | |||
10984 | if (!Val.isInt()) { | |||
10985 | // FIXME: It would be better to produce the diagnostic for casting | |||
10986 | // a pointer to an integer. | |||
10987 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
10988 | return false; | |||
10989 | } | |||
10990 | Result = Val.getInt(); | |||
10991 | return true; | |||
10992 | } | |||
10993 | ||||
10994 | bool IntExprEvaluator::VisitSourceLocExpr(const SourceLocExpr *E) { | |||
10995 | APValue Evaluated = E->EvaluateInContext( | |||
10996 | Info.Ctx, Info.CurrentCall->CurSourceLocExprScope.getDefaultExpr()); | |||
10997 | return Success(Evaluated, E); | |||
10998 | } | |||
10999 | ||||
11000 | static bool EvaluateFixedPoint(const Expr *E, APFixedPoint &Result, | |||
11001 | EvalInfo &Info) { | |||
11002 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 11002, __extension__ __PRETTY_FUNCTION__)); | |||
11003 | if (E->getType()->isFixedPointType()) { | |||
11004 | APValue Val; | |||
11005 | if (!FixedPointExprEvaluator(Info, Val).Visit(E)) | |||
11006 | return false; | |||
11007 | if (!Val.isFixedPoint()) | |||
11008 | return false; | |||
11009 | ||||
11010 | Result = Val.getFixedPoint(); | |||
11011 | return true; | |||
11012 | } | |||
11013 | return false; | |||
11014 | } | |||
11015 | ||||
11016 | static bool EvaluateFixedPointOrInteger(const Expr *E, APFixedPoint &Result, | |||
11017 | EvalInfo &Info) { | |||
11018 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 11018, __extension__ __PRETTY_FUNCTION__)); | |||
11019 | if (E->getType()->isIntegerType()) { | |||
11020 | auto FXSema = Info.Ctx.getFixedPointSemantics(E->getType()); | |||
11021 | APSInt Val; | |||
11022 | if (!EvaluateInteger(E, Val, Info)) | |||
11023 | return false; | |||
11024 | Result = APFixedPoint(Val, FXSema); | |||
11025 | return true; | |||
11026 | } else if (E->getType()->isFixedPointType()) { | |||
11027 | return EvaluateFixedPoint(E, Result, Info); | |||
11028 | } | |||
11029 | return false; | |||
11030 | } | |||
11031 | ||||
11032 | /// Check whether the given declaration can be directly converted to an integral | |||
11033 | /// rvalue. If not, no diagnostic is produced; there are other things we can | |||
11034 | /// try. | |||
11035 | bool IntExprEvaluator::CheckReferencedDecl(const Expr* E, const Decl* D) { | |||
11036 | // Enums are integer constant exprs. | |||
11037 | if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(D)) { | |||
11038 | // Check for signedness/width mismatches between E type and ECD value. | |||
11039 | bool SameSign = (ECD->getInitVal().isSigned() | |||
11040 | == E->getType()->isSignedIntegerOrEnumerationType()); | |||
11041 | bool SameWidth = (ECD->getInitVal().getBitWidth() | |||
11042 | == Info.Ctx.getIntWidth(E->getType())); | |||
11043 | if (SameSign && SameWidth) | |||
11044 | return Success(ECD->getInitVal(), E); | |||
11045 | else { | |||
11046 | // Get rid of mismatch (otherwise Success assertions will fail) | |||
11047 | // by computing a new value matching the type of E. | |||
11048 | llvm::APSInt Val = ECD->getInitVal(); | |||
11049 | if (!SameSign) | |||
11050 | Val.setIsSigned(!ECD->getInitVal().isSigned()); | |||
11051 | if (!SameWidth) | |||
11052 | Val = Val.extOrTrunc(Info.Ctx.getIntWidth(E->getType())); | |||
11053 | return Success(Val, E); | |||
11054 | } | |||
11055 | } | |||
11056 | return false; | |||
11057 | } | |||
11058 | ||||
11059 | /// Values returned by __builtin_classify_type, chosen to match the values | |||
11060 | /// produced by GCC's builtin. | |||
11061 | enum class GCCTypeClass { | |||
11062 | None = -1, | |||
11063 | Void = 0, | |||
11064 | Integer = 1, | |||
11065 | // GCC reserves 2 for character types, but instead classifies them as | |||
11066 | // integers. | |||
11067 | Enum = 3, | |||
11068 | Bool = 4, | |||
11069 | Pointer = 5, | |||
11070 | // GCC reserves 6 for references, but appears to never use it (because | |||
11071 | // expressions never have reference type, presumably). | |||
11072 | PointerToDataMember = 7, | |||
11073 | RealFloat = 8, | |||
11074 | Complex = 9, | |||
11075 | // GCC reserves 10 for functions, but does not use it since GCC version 6 due | |||
11076 | // to decay to pointer. (Prior to version 6 it was only used in C++ mode). | |||
11077 | // GCC claims to reserve 11 for pointers to member functions, but *actually* | |||
11078 | // uses 12 for that purpose, same as for a class or struct. Maybe it | |||
11079 | // internally implements a pointer to member as a struct? Who knows. | |||
11080 | PointerToMemberFunction = 12, // Not a bug, see above. | |||
11081 | ClassOrStruct = 12, | |||
11082 | Union = 13, | |||
11083 | // GCC reserves 14 for arrays, but does not use it since GCC version 6 due to | |||
11084 | // decay to pointer. (Prior to version 6 it was only used in C++ mode). | |||
11085 | // GCC reserves 15 for strings, but actually uses 5 (pointer) for string | |||
11086 | // literals. | |||
11087 | }; | |||
11088 | ||||
11089 | /// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way | |||
11090 | /// as GCC. | |||
11091 | static GCCTypeClass | |||
11092 | EvaluateBuiltinClassifyType(QualType T, const LangOptions &LangOpts) { | |||
11093 | assert(!T->isDependentType() && "unexpected dependent type")(static_cast <bool> (!T->isDependentType() && "unexpected dependent type") ? void (0) : __assert_fail ("!T->isDependentType() && \"unexpected dependent type\"" , "clang/lib/AST/ExprConstant.cpp", 11093, __extension__ __PRETTY_FUNCTION__ )); | |||
11094 | ||||
11095 | QualType CanTy = T.getCanonicalType(); | |||
11096 | const BuiltinType *BT = dyn_cast<BuiltinType>(CanTy); | |||
11097 | ||||
11098 | switch (CanTy->getTypeClass()) { | |||
11099 | #define TYPE(ID, BASE) | |||
11100 | #define DEPENDENT_TYPE(ID, BASE) case Type::ID: | |||
11101 | #define NON_CANONICAL_TYPE(ID, BASE) case Type::ID: | |||
11102 | #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(ID, BASE) case Type::ID: | |||
11103 | #include "clang/AST/TypeNodes.inc" | |||
11104 | case Type::Auto: | |||
11105 | case Type::DeducedTemplateSpecialization: | |||
11106 | llvm_unreachable("unexpected non-canonical or dependent type")::llvm::llvm_unreachable_internal("unexpected non-canonical or dependent type" , "clang/lib/AST/ExprConstant.cpp", 11106); | |||
11107 | ||||
11108 | case Type::Builtin: | |||
11109 | switch (BT->getKind()) { | |||
11110 | #define BUILTIN_TYPE(ID, SINGLETON_ID) | |||
11111 | #define SIGNED_TYPE(ID, SINGLETON_ID) \ | |||
11112 | case BuiltinType::ID: return GCCTypeClass::Integer; | |||
11113 | #define FLOATING_TYPE(ID, SINGLETON_ID) \ | |||
11114 | case BuiltinType::ID: return GCCTypeClass::RealFloat; | |||
11115 | #define PLACEHOLDER_TYPE(ID, SINGLETON_ID) \ | |||
11116 | case BuiltinType::ID: break; | |||
11117 | #include "clang/AST/BuiltinTypes.def" | |||
11118 | case BuiltinType::Void: | |||
11119 | return GCCTypeClass::Void; | |||
11120 | ||||
11121 | case BuiltinType::Bool: | |||
11122 | return GCCTypeClass::Bool; | |||
11123 | ||||
11124 | case BuiltinType::Char_U: | |||
11125 | case BuiltinType::UChar: | |||
11126 | case BuiltinType::WChar_U: | |||
11127 | case BuiltinType::Char8: | |||
11128 | case BuiltinType::Char16: | |||
11129 | case BuiltinType::Char32: | |||
11130 | case BuiltinType::UShort: | |||
11131 | case BuiltinType::UInt: | |||
11132 | case BuiltinType::ULong: | |||
11133 | case BuiltinType::ULongLong: | |||
11134 | case BuiltinType::UInt128: | |||
11135 | return GCCTypeClass::Integer; | |||
11136 | ||||
11137 | case BuiltinType::UShortAccum: | |||
11138 | case BuiltinType::UAccum: | |||
11139 | case BuiltinType::ULongAccum: | |||
11140 | case BuiltinType::UShortFract: | |||
11141 | case BuiltinType::UFract: | |||
11142 | case BuiltinType::ULongFract: | |||
11143 | case BuiltinType::SatUShortAccum: | |||
11144 | case BuiltinType::SatUAccum: | |||
11145 | case BuiltinType::SatULongAccum: | |||
11146 | case BuiltinType::SatUShortFract: | |||
11147 | case BuiltinType::SatUFract: | |||
11148 | case BuiltinType::SatULongFract: | |||
11149 | return GCCTypeClass::None; | |||
11150 | ||||
11151 | case BuiltinType::NullPtr: | |||
11152 | ||||
11153 | case BuiltinType::ObjCId: | |||
11154 | case BuiltinType::ObjCClass: | |||
11155 | case BuiltinType::ObjCSel: | |||
11156 | #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \ | |||
11157 | case BuiltinType::Id: | |||
11158 | #include "clang/Basic/OpenCLImageTypes.def" | |||
11159 | #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \ | |||
11160 | case BuiltinType::Id: | |||
11161 | #include "clang/Basic/OpenCLExtensionTypes.def" | |||
11162 | case BuiltinType::OCLSampler: | |||
11163 | case BuiltinType::OCLEvent: | |||
11164 | case BuiltinType::OCLClkEvent: | |||
11165 | case BuiltinType::OCLQueue: | |||
11166 | case BuiltinType::OCLReserveID: | |||
11167 | #define SVE_TYPE(Name, Id, SingletonId) \ | |||
11168 | case BuiltinType::Id: | |||
11169 | #include "clang/Basic/AArch64SVEACLETypes.def" | |||
11170 | #define PPC_VECTOR_TYPE(Name, Id, Size) \ | |||
11171 | case BuiltinType::Id: | |||
11172 | #include "clang/Basic/PPCTypes.def" | |||
11173 | #define RVV_TYPE(Name, Id, SingletonId) case BuiltinType::Id: | |||
11174 | #include "clang/Basic/RISCVVTypes.def" | |||
11175 | return GCCTypeClass::None; | |||
11176 | ||||
11177 | case BuiltinType::Dependent: | |||
11178 | llvm_unreachable("unexpected dependent type")::llvm::llvm_unreachable_internal("unexpected dependent type" , "clang/lib/AST/ExprConstant.cpp", 11178); | |||
11179 | }; | |||
11180 | llvm_unreachable("unexpected placeholder type")::llvm::llvm_unreachable_internal("unexpected placeholder type" , "clang/lib/AST/ExprConstant.cpp", 11180); | |||
11181 | ||||
11182 | case Type::Enum: | |||
11183 | return LangOpts.CPlusPlus ? GCCTypeClass::Enum : GCCTypeClass::Integer; | |||
11184 | ||||
11185 | case Type::Pointer: | |||
11186 | case Type::ConstantArray: | |||
11187 | case Type::VariableArray: | |||
11188 | case Type::IncompleteArray: | |||
11189 | case Type::FunctionNoProto: | |||
11190 | case Type::FunctionProto: | |||
11191 | return GCCTypeClass::Pointer; | |||
11192 | ||||
11193 | case Type::MemberPointer: | |||
11194 | return CanTy->isMemberDataPointerType() | |||
11195 | ? GCCTypeClass::PointerToDataMember | |||
11196 | : GCCTypeClass::PointerToMemberFunction; | |||
11197 | ||||
11198 | case Type::Complex: | |||
11199 | return GCCTypeClass::Complex; | |||
11200 | ||||
11201 | case Type::Record: | |||
11202 | return CanTy->isUnionType() ? GCCTypeClass::Union | |||
11203 | : GCCTypeClass::ClassOrStruct; | |||
11204 | ||||
11205 | case Type::Atomic: | |||
11206 | // GCC classifies _Atomic T the same as T. | |||
11207 | return EvaluateBuiltinClassifyType( | |||
11208 | CanTy->castAs<AtomicType>()->getValueType(), LangOpts); | |||
11209 | ||||
11210 | case Type::BlockPointer: | |||
11211 | case Type::Vector: | |||
11212 | case Type::ExtVector: | |||
11213 | case Type::ConstantMatrix: | |||
11214 | case Type::ObjCObject: | |||
11215 | case Type::ObjCInterface: | |||
11216 | case Type::ObjCObjectPointer: | |||
11217 | case Type::Pipe: | |||
11218 | case Type::BitInt: | |||
11219 | // GCC classifies vectors as None. We follow its lead and classify all | |||
11220 | // other types that don't fit into the regular classification the same way. | |||
11221 | return GCCTypeClass::None; | |||
11222 | ||||
11223 | case Type::LValueReference: | |||
11224 | case Type::RValueReference: | |||
11225 | llvm_unreachable("invalid type for expression")::llvm::llvm_unreachable_internal("invalid type for expression" , "clang/lib/AST/ExprConstant.cpp", 11225); | |||
11226 | } | |||
11227 | ||||
11228 | llvm_unreachable("unexpected type class")::llvm::llvm_unreachable_internal("unexpected type class", "clang/lib/AST/ExprConstant.cpp" , 11228); | |||
11229 | } | |||
11230 | ||||
11231 | /// EvaluateBuiltinClassifyType - Evaluate __builtin_classify_type the same way | |||
11232 | /// as GCC. | |||
11233 | static GCCTypeClass | |||
11234 | EvaluateBuiltinClassifyType(const CallExpr *E, const LangOptions &LangOpts) { | |||
11235 | // If no argument was supplied, default to None. This isn't | |||
11236 | // ideal, however it is what gcc does. | |||
11237 | if (E->getNumArgs() == 0) | |||
11238 | return GCCTypeClass::None; | |||
11239 | ||||
11240 | // FIXME: Bizarrely, GCC treats a call with more than one argument as not | |||
11241 | // being an ICE, but still folds it to a constant using the type of the first | |||
11242 | // argument. | |||
11243 | return EvaluateBuiltinClassifyType(E->getArg(0)->getType(), LangOpts); | |||
11244 | } | |||
11245 | ||||
11246 | /// EvaluateBuiltinConstantPForLValue - Determine the result of | |||
11247 | /// __builtin_constant_p when applied to the given pointer. | |||
11248 | /// | |||
11249 | /// A pointer is only "constant" if it is null (or a pointer cast to integer) | |||
11250 | /// or it points to the first character of a string literal. | |||
11251 | static bool EvaluateBuiltinConstantPForLValue(const APValue &LV) { | |||
11252 | APValue::LValueBase Base = LV.getLValueBase(); | |||
11253 | if (Base.isNull()) { | |||
11254 | // A null base is acceptable. | |||
11255 | return true; | |||
11256 | } else if (const Expr *E = Base.dyn_cast<const Expr *>()) { | |||
11257 | if (!isa<StringLiteral>(E)) | |||
11258 | return false; | |||
11259 | return LV.getLValueOffset().isZero(); | |||
11260 | } else if (Base.is<TypeInfoLValue>()) { | |||
11261 | // Surprisingly, GCC considers __builtin_constant_p(&typeid(int)) to | |||
11262 | // evaluate to true. | |||
11263 | return true; | |||
11264 | } else { | |||
11265 | // Any other base is not constant enough for GCC. | |||
11266 | return false; | |||
11267 | } | |||
11268 | } | |||
11269 | ||||
11270 | /// EvaluateBuiltinConstantP - Evaluate __builtin_constant_p as similarly to | |||
11271 | /// GCC as we can manage. | |||
11272 | static bool EvaluateBuiltinConstantP(EvalInfo &Info, const Expr *Arg) { | |||
11273 | // This evaluation is not permitted to have side-effects, so evaluate it in | |||
11274 | // a speculative evaluation context. | |||
11275 | SpeculativeEvaluationRAII SpeculativeEval(Info); | |||
11276 | ||||
11277 | // Constant-folding is always enabled for the operand of __builtin_constant_p | |||
11278 | // (even when the enclosing evaluation context otherwise requires a strict | |||
11279 | // language-specific constant expression). | |||
11280 | FoldConstant Fold(Info, true); | |||
11281 | ||||
11282 | QualType ArgType = Arg->getType(); | |||
11283 | ||||
11284 | // __builtin_constant_p always has one operand. The rules which gcc follows | |||
11285 | // are not precisely documented, but are as follows: | |||
11286 | // | |||
11287 | // - If the operand is of integral, floating, complex or enumeration type, | |||
11288 | // and can be folded to a known value of that type, it returns 1. | |||
11289 | // - If the operand can be folded to a pointer to the first character | |||
11290 | // of a string literal (or such a pointer cast to an integral type) | |||
11291 | // or to a null pointer or an integer cast to a pointer, it returns 1. | |||
11292 | // | |||
11293 | // Otherwise, it returns 0. | |||
11294 | // | |||
11295 | // FIXME: GCC also intends to return 1 for literals of aggregate types, but | |||
11296 | // its support for this did not work prior to GCC 9 and is not yet well | |||
11297 | // understood. | |||
11298 | if (ArgType->isIntegralOrEnumerationType() || ArgType->isFloatingType() || | |||
11299 | ArgType->isAnyComplexType() || ArgType->isPointerType() || | |||
11300 | ArgType->isNullPtrType()) { | |||
11301 | APValue V; | |||
11302 | if (!::EvaluateAsRValue(Info, Arg, V) || Info.EvalStatus.HasSideEffects) { | |||
11303 | Fold.keepDiagnostics(); | |||
11304 | return false; | |||
11305 | } | |||
11306 | ||||
11307 | // For a pointer (possibly cast to integer), there are special rules. | |||
11308 | if (V.getKind() == APValue::LValue) | |||
11309 | return EvaluateBuiltinConstantPForLValue(V); | |||
11310 | ||||
11311 | // Otherwise, any constant value is good enough. | |||
11312 | return V.hasValue(); | |||
11313 | } | |||
11314 | ||||
11315 | // Anything else isn't considered to be sufficiently constant. | |||
11316 | return false; | |||
11317 | } | |||
11318 | ||||
11319 | /// Retrieves the "underlying object type" of the given expression, | |||
11320 | /// as used by __builtin_object_size. | |||
11321 | static QualType getObjectType(APValue::LValueBase B) { | |||
11322 | if (const ValueDecl *D = B.dyn_cast<const ValueDecl*>()) { | |||
11323 | if (const VarDecl *VD = dyn_cast<VarDecl>(D)) | |||
11324 | return VD->getType(); | |||
11325 | } else if (const Expr *E = B.dyn_cast<const Expr*>()) { | |||
11326 | if (isa<CompoundLiteralExpr>(E)) | |||
11327 | return E->getType(); | |||
11328 | } else if (B.is<TypeInfoLValue>()) { | |||
11329 | return B.getTypeInfoType(); | |||
11330 | } else if (B.is<DynamicAllocLValue>()) { | |||
11331 | return B.getDynamicAllocType(); | |||
11332 | } | |||
11333 | ||||
11334 | return QualType(); | |||
11335 | } | |||
11336 | ||||
11337 | /// A more selective version of E->IgnoreParenCasts for | |||
11338 | /// tryEvaluateBuiltinObjectSize. This ignores some casts/parens that serve only | |||
11339 | /// to change the type of E. | |||
11340 | /// Ex. For E = `(short*)((char*)(&foo))`, returns `&foo` | |||
11341 | /// | |||
11342 | /// Always returns an RValue with a pointer representation. | |||
11343 | static const Expr *ignorePointerCastsAndParens(const Expr *E) { | |||
11344 | assert(E->isPRValue() && E->getType()->hasPointerRepresentation())(static_cast <bool> (E->isPRValue() && E-> getType()->hasPointerRepresentation()) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->hasPointerRepresentation()" , "clang/lib/AST/ExprConstant.cpp", 11344, __extension__ __PRETTY_FUNCTION__ )); | |||
11345 | ||||
11346 | auto *NoParens = E->IgnoreParens(); | |||
11347 | auto *Cast = dyn_cast<CastExpr>(NoParens); | |||
11348 | if (Cast == nullptr) | |||
11349 | return NoParens; | |||
11350 | ||||
11351 | // We only conservatively allow a few kinds of casts, because this code is | |||
11352 | // inherently a simple solution that seeks to support the common case. | |||
11353 | auto CastKind = Cast->getCastKind(); | |||
11354 | if (CastKind != CK_NoOp && CastKind != CK_BitCast && | |||
11355 | CastKind != CK_AddressSpaceConversion) | |||
11356 | return NoParens; | |||
11357 | ||||
11358 | auto *SubExpr = Cast->getSubExpr(); | |||
11359 | if (!SubExpr->getType()->hasPointerRepresentation() || !SubExpr->isPRValue()) | |||
11360 | return NoParens; | |||
11361 | return ignorePointerCastsAndParens(SubExpr); | |||
11362 | } | |||
11363 | ||||
11364 | /// Checks to see if the given LValue's Designator is at the end of the LValue's | |||
11365 | /// record layout. e.g. | |||
11366 | /// struct { struct { int a, b; } fst, snd; } obj; | |||
11367 | /// obj.fst // no | |||
11368 | /// obj.snd // yes | |||
11369 | /// obj.fst.a // no | |||
11370 | /// obj.fst.b // no | |||
11371 | /// obj.snd.a // no | |||
11372 | /// obj.snd.b // yes | |||
11373 | /// | |||
11374 | /// Please note: this function is specialized for how __builtin_object_size | |||
11375 | /// views "objects". | |||
11376 | /// | |||
11377 | /// If this encounters an invalid RecordDecl or otherwise cannot determine the | |||
11378 | /// correct result, it will always return true. | |||
11379 | static bool isDesignatorAtObjectEnd(const ASTContext &Ctx, const LValue &LVal) { | |||
11380 | assert(!LVal.Designator.Invalid)(static_cast <bool> (!LVal.Designator.Invalid) ? void ( 0) : __assert_fail ("!LVal.Designator.Invalid", "clang/lib/AST/ExprConstant.cpp" , 11380, __extension__ __PRETTY_FUNCTION__)); | |||
11381 | ||||
11382 | auto IsLastOrInvalidFieldDecl = [&Ctx](const FieldDecl *FD, bool &Invalid) { | |||
11383 | const RecordDecl *Parent = FD->getParent(); | |||
11384 | Invalid = Parent->isInvalidDecl(); | |||
11385 | if (Invalid || Parent->isUnion()) | |||
11386 | return true; | |||
11387 | const ASTRecordLayout &Layout = Ctx.getASTRecordLayout(Parent); | |||
11388 | return FD->getFieldIndex() + 1 == Layout.getFieldCount(); | |||
11389 | }; | |||
11390 | ||||
11391 | auto &Base = LVal.getLValueBase(); | |||
11392 | if (auto *ME = dyn_cast_or_null<MemberExpr>(Base.dyn_cast<const Expr *>())) { | |||
11393 | if (auto *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { | |||
11394 | bool Invalid; | |||
11395 | if (!IsLastOrInvalidFieldDecl(FD, Invalid)) | |||
11396 | return Invalid; | |||
11397 | } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(ME->getMemberDecl())) { | |||
11398 | for (auto *FD : IFD->chain()) { | |||
11399 | bool Invalid; | |||
11400 | if (!IsLastOrInvalidFieldDecl(cast<FieldDecl>(FD), Invalid)) | |||
11401 | return Invalid; | |||
11402 | } | |||
11403 | } | |||
11404 | } | |||
11405 | ||||
11406 | unsigned I = 0; | |||
11407 | QualType BaseType = getType(Base); | |||
11408 | if (LVal.Designator.FirstEntryIsAnUnsizedArray) { | |||
11409 | // If we don't know the array bound, conservatively assume we're looking at | |||
11410 | // the final array element. | |||
11411 | ++I; | |||
11412 | if (BaseType->isIncompleteArrayType()) | |||
11413 | BaseType = Ctx.getAsArrayType(BaseType)->getElementType(); | |||
11414 | else | |||
11415 | BaseType = BaseType->castAs<PointerType>()->getPointeeType(); | |||
11416 | } | |||
11417 | ||||
11418 | for (unsigned E = LVal.Designator.Entries.size(); I != E; ++I) { | |||
11419 | const auto &Entry = LVal.Designator.Entries[I]; | |||
11420 | if (BaseType->isArrayType()) { | |||
11421 | // Because __builtin_object_size treats arrays as objects, we can ignore | |||
11422 | // the index iff this is the last array in the Designator. | |||
11423 | if (I + 1 == E) | |||
11424 | return true; | |||
11425 | const auto *CAT = cast<ConstantArrayType>(Ctx.getAsArrayType(BaseType)); | |||
11426 | uint64_t Index = Entry.getAsArrayIndex(); | |||
11427 | if (Index + 1 != CAT->getSize()) | |||
11428 | return false; | |||
11429 | BaseType = CAT->getElementType(); | |||
11430 | } else if (BaseType->isAnyComplexType()) { | |||
11431 | const auto *CT = BaseType->castAs<ComplexType>(); | |||
11432 | uint64_t Index = Entry.getAsArrayIndex(); | |||
11433 | if (Index != 1) | |||
11434 | return false; | |||
11435 | BaseType = CT->getElementType(); | |||
11436 | } else if (auto *FD = getAsField(Entry)) { | |||
11437 | bool Invalid; | |||
11438 | if (!IsLastOrInvalidFieldDecl(FD, Invalid)) | |||
11439 | return Invalid; | |||
11440 | BaseType = FD->getType(); | |||
11441 | } else { | |||
11442 | assert(getAsBaseClass(Entry) && "Expecting cast to a base class")(static_cast <bool> (getAsBaseClass(Entry) && "Expecting cast to a base class" ) ? void (0) : __assert_fail ("getAsBaseClass(Entry) && \"Expecting cast to a base class\"" , "clang/lib/AST/ExprConstant.cpp", 11442, __extension__ __PRETTY_FUNCTION__ )); | |||
11443 | return false; | |||
11444 | } | |||
11445 | } | |||
11446 | return true; | |||
11447 | } | |||
11448 | ||||
11449 | /// Tests to see if the LValue has a user-specified designator (that isn't | |||
11450 | /// necessarily valid). Note that this always returns 'true' if the LValue has | |||
11451 | /// an unsized array as its first designator entry, because there's currently no | |||
11452 | /// way to tell if the user typed *foo or foo[0]. | |||
11453 | static bool refersToCompleteObject(const LValue &LVal) { | |||
11454 | if (LVal.Designator.Invalid) | |||
11455 | return false; | |||
11456 | ||||
11457 | if (!LVal.Designator.Entries.empty()) | |||
11458 | return LVal.Designator.isMostDerivedAnUnsizedArray(); | |||
11459 | ||||
11460 | if (!LVal.InvalidBase) | |||
11461 | return true; | |||
11462 | ||||
11463 | // If `E` is a MemberExpr, then the first part of the designator is hiding in | |||
11464 | // the LValueBase. | |||
11465 | const auto *E = LVal.Base.dyn_cast<const Expr *>(); | |||
11466 | return !E || !isa<MemberExpr>(E); | |||
11467 | } | |||
11468 | ||||
11469 | /// Attempts to detect a user writing into a piece of memory that's impossible | |||
11470 | /// to figure out the size of by just using types. | |||
11471 | static bool isUserWritingOffTheEnd(const ASTContext &Ctx, const LValue &LVal) { | |||
11472 | const SubobjectDesignator &Designator = LVal.Designator; | |||
11473 | // Notes: | |||
11474 | // - Users can only write off of the end when we have an invalid base. Invalid | |||
11475 | // bases imply we don't know where the memory came from. | |||
11476 | // - We used to be a bit more aggressive here; we'd only be conservative if | |||
11477 | // the array at the end was flexible, or if it had 0 or 1 elements. This | |||
11478 | // broke some common standard library extensions (PR30346), but was | |||
11479 | // otherwise seemingly fine. It may be useful to reintroduce this behavior | |||
11480 | // with some sort of list. OTOH, it seems that GCC is always | |||
11481 | // conservative with the last element in structs (if it's an array), so our | |||
11482 | // current behavior is more compatible than an explicit list approach would | |||
11483 | // be. | |||
11484 | return LVal.InvalidBase && | |||
11485 | Designator.Entries.size() == Designator.MostDerivedPathLength && | |||
11486 | Designator.MostDerivedIsArrayElement && | |||
11487 | isDesignatorAtObjectEnd(Ctx, LVal); | |||
11488 | } | |||
11489 | ||||
11490 | /// Converts the given APInt to CharUnits, assuming the APInt is unsigned. | |||
11491 | /// Fails if the conversion would cause loss of precision. | |||
11492 | static bool convertUnsignedAPIntToCharUnits(const llvm::APInt &Int, | |||
11493 | CharUnits &Result) { | |||
11494 | auto CharUnitsMax = std::numeric_limits<CharUnits::QuantityType>::max(); | |||
11495 | if (Int.ugt(CharUnitsMax)) | |||
11496 | return false; | |||
11497 | Result = CharUnits::fromQuantity(Int.getZExtValue()); | |||
11498 | return true; | |||
11499 | } | |||
11500 | ||||
11501 | /// Helper for tryEvaluateBuiltinObjectSize -- Given an LValue, this will | |||
11502 | /// determine how many bytes exist from the beginning of the object to either | |||
11503 | /// the end of the current subobject, or the end of the object itself, depending | |||
11504 | /// on what the LValue looks like + the value of Type. | |||
11505 | /// | |||
11506 | /// If this returns false, the value of Result is undefined. | |||
11507 | static bool determineEndOffset(EvalInfo &Info, SourceLocation ExprLoc, | |||
11508 | unsigned Type, const LValue &LVal, | |||
11509 | CharUnits &EndOffset) { | |||
11510 | bool DetermineForCompleteObject = refersToCompleteObject(LVal); | |||
11511 | ||||
11512 | auto CheckedHandleSizeof = [&](QualType Ty, CharUnits &Result) { | |||
11513 | if (Ty.isNull() || Ty->isIncompleteType() || Ty->isFunctionType()) | |||
11514 | return false; | |||
11515 | return HandleSizeof(Info, ExprLoc, Ty, Result); | |||
11516 | }; | |||
11517 | ||||
11518 | // We want to evaluate the size of the entire object. This is a valid fallback | |||
11519 | // for when Type=1 and the designator is invalid, because we're asked for an | |||
11520 | // upper-bound. | |||
11521 | if (!(Type & 1) || LVal.Designator.Invalid || DetermineForCompleteObject) { | |||
11522 | // Type=3 wants a lower bound, so we can't fall back to this. | |||
11523 | if (Type == 3 && !DetermineForCompleteObject) | |||
11524 | return false; | |||
11525 | ||||
11526 | llvm::APInt APEndOffset; | |||
11527 | if (isBaseAnAllocSizeCall(LVal.getLValueBase()) && | |||
11528 | getBytesReturnedByAllocSizeCall(Info.Ctx, LVal, APEndOffset)) | |||
11529 | return convertUnsignedAPIntToCharUnits(APEndOffset, EndOffset); | |||
11530 | ||||
11531 | if (LVal.InvalidBase) | |||
11532 | return false; | |||
11533 | ||||
11534 | QualType BaseTy = getObjectType(LVal.getLValueBase()); | |||
11535 | return CheckedHandleSizeof(BaseTy, EndOffset); | |||
11536 | } | |||
11537 | ||||
11538 | // We want to evaluate the size of a subobject. | |||
11539 | const SubobjectDesignator &Designator = LVal.Designator; | |||
11540 | ||||
11541 | // The following is a moderately common idiom in C: | |||
11542 | // | |||
11543 | // struct Foo { int a; char c[1]; }; | |||
11544 | // struct Foo *F = (struct Foo *)malloc(sizeof(struct Foo) + strlen(Bar)); | |||
11545 | // strcpy(&F->c[0], Bar); | |||
11546 | // | |||
11547 | // In order to not break too much legacy code, we need to support it. | |||
11548 | if (isUserWritingOffTheEnd(Info.Ctx, LVal)) { | |||
11549 | // If we can resolve this to an alloc_size call, we can hand that back, | |||
11550 | // because we know for certain how many bytes there are to write to. | |||
11551 | llvm::APInt APEndOffset; | |||
11552 | if (isBaseAnAllocSizeCall(LVal.getLValueBase()) && | |||
11553 | getBytesReturnedByAllocSizeCall(Info.Ctx, LVal, APEndOffset)) | |||
11554 | return convertUnsignedAPIntToCharUnits(APEndOffset, EndOffset); | |||
11555 | ||||
11556 | // If we cannot determine the size of the initial allocation, then we can't | |||
11557 | // given an accurate upper-bound. However, we are still able to give | |||
11558 | // conservative lower-bounds for Type=3. | |||
11559 | if (Type == 1) | |||
11560 | return false; | |||
11561 | } | |||
11562 | ||||
11563 | CharUnits BytesPerElem; | |||
11564 | if (!CheckedHandleSizeof(Designator.MostDerivedType, BytesPerElem)) | |||
11565 | return false; | |||
11566 | ||||
11567 | // According to the GCC documentation, we want the size of the subobject | |||
11568 | // denoted by the pointer. But that's not quite right -- what we actually | |||
11569 | // want is the size of the immediately-enclosing array, if there is one. | |||
11570 | int64_t ElemsRemaining; | |||
11571 | if (Designator.MostDerivedIsArrayElement && | |||
11572 | Designator.Entries.size() == Designator.MostDerivedPathLength) { | |||
11573 | uint64_t ArraySize = Designator.getMostDerivedArraySize(); | |||
11574 | uint64_t ArrayIndex = Designator.Entries.back().getAsArrayIndex(); | |||
11575 | ElemsRemaining = ArraySize <= ArrayIndex ? 0 : ArraySize - ArrayIndex; | |||
11576 | } else { | |||
11577 | ElemsRemaining = Designator.isOnePastTheEnd() ? 0 : 1; | |||
11578 | } | |||
11579 | ||||
11580 | EndOffset = LVal.getLValueOffset() + BytesPerElem * ElemsRemaining; | |||
11581 | return true; | |||
11582 | } | |||
11583 | ||||
11584 | /// Tries to evaluate the __builtin_object_size for @p E. If successful, | |||
11585 | /// returns true and stores the result in @p Size. | |||
11586 | /// | |||
11587 | /// If @p WasError is non-null, this will report whether the failure to evaluate | |||
11588 | /// is to be treated as an Error in IntExprEvaluator. | |||
11589 | static bool tryEvaluateBuiltinObjectSize(const Expr *E, unsigned Type, | |||
11590 | EvalInfo &Info, uint64_t &Size) { | |||
11591 | // Determine the denoted object. | |||
11592 | LValue LVal; | |||
11593 | { | |||
11594 | // The operand of __builtin_object_size is never evaluated for side-effects. | |||
11595 | // If there are any, but we can determine the pointed-to object anyway, then | |||
11596 | // ignore the side-effects. | |||
11597 | SpeculativeEvaluationRAII SpeculativeEval(Info); | |||
11598 | IgnoreSideEffectsRAII Fold(Info); | |||
11599 | ||||
11600 | if (E->isGLValue()) { | |||
11601 | // It's possible for us to be given GLValues if we're called via | |||
11602 | // Expr::tryEvaluateObjectSize. | |||
11603 | APValue RVal; | |||
11604 | if (!EvaluateAsRValue(Info, E, RVal)) | |||
11605 | return false; | |||
11606 | LVal.setFrom(Info.Ctx, RVal); | |||
11607 | } else if (!EvaluatePointer(ignorePointerCastsAndParens(E), LVal, Info, | |||
11608 | /*InvalidBaseOK=*/true)) | |||
11609 | return false; | |||
11610 | } | |||
11611 | ||||
11612 | // If we point to before the start of the object, there are no accessible | |||
11613 | // bytes. | |||
11614 | if (LVal.getLValueOffset().isNegative()) { | |||
11615 | Size = 0; | |||
11616 | return true; | |||
11617 | } | |||
11618 | ||||
11619 | CharUnits EndOffset; | |||
11620 | if (!determineEndOffset(Info, E->getExprLoc(), Type, LVal, EndOffset)) | |||
11621 | return false; | |||
11622 | ||||
11623 | // If we've fallen outside of the end offset, just pretend there's nothing to | |||
11624 | // write to/read from. | |||
11625 | if (EndOffset <= LVal.getLValueOffset()) | |||
11626 | Size = 0; | |||
11627 | else | |||
11628 | Size = (EndOffset - LVal.getLValueOffset()).getQuantity(); | |||
11629 | return true; | |||
11630 | } | |||
11631 | ||||
11632 | bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) { | |||
11633 | if (unsigned BuiltinOp = E->getBuiltinCallee()) | |||
11634 | return VisitBuiltinCallExpr(E, BuiltinOp); | |||
11635 | ||||
11636 | return ExprEvaluatorBaseTy::VisitCallExpr(E); | |||
11637 | } | |||
11638 | ||||
11639 | static bool getBuiltinAlignArguments(const CallExpr *E, EvalInfo &Info, | |||
11640 | APValue &Val, APSInt &Alignment) { | |||
11641 | QualType SrcTy = E->getArg(0)->getType(); | |||
11642 | if (!getAlignmentArgument(E->getArg(1), SrcTy, Info, Alignment)) | |||
11643 | return false; | |||
11644 | // Even though we are evaluating integer expressions we could get a pointer | |||
11645 | // argument for the __builtin_is_aligned() case. | |||
11646 | if (SrcTy->isPointerType()) { | |||
11647 | LValue Ptr; | |||
11648 | if (!EvaluatePointer(E->getArg(0), Ptr, Info)) | |||
11649 | return false; | |||
11650 | Ptr.moveInto(Val); | |||
11651 | } else if (!SrcTy->isIntegralOrEnumerationType()) { | |||
11652 | Info.FFDiag(E->getArg(0)); | |||
11653 | return false; | |||
11654 | } else { | |||
11655 | APSInt SrcInt; | |||
11656 | if (!EvaluateInteger(E->getArg(0), SrcInt, Info)) | |||
11657 | return false; | |||
11658 | assert(SrcInt.getBitWidth() >= Alignment.getBitWidth() &&(static_cast <bool> (SrcInt.getBitWidth() >= Alignment .getBitWidth() && "Bit widths must be the same") ? void (0) : __assert_fail ("SrcInt.getBitWidth() >= Alignment.getBitWidth() && \"Bit widths must be the same\"" , "clang/lib/AST/ExprConstant.cpp", 11659, __extension__ __PRETTY_FUNCTION__ )) | |||
11659 | "Bit widths must be the same")(static_cast <bool> (SrcInt.getBitWidth() >= Alignment .getBitWidth() && "Bit widths must be the same") ? void (0) : __assert_fail ("SrcInt.getBitWidth() >= Alignment.getBitWidth() && \"Bit widths must be the same\"" , "clang/lib/AST/ExprConstant.cpp", 11659, __extension__ __PRETTY_FUNCTION__ )); | |||
11660 | Val = APValue(SrcInt); | |||
11661 | } | |||
11662 | assert(Val.hasValue())(static_cast <bool> (Val.hasValue()) ? void (0) : __assert_fail ("Val.hasValue()", "clang/lib/AST/ExprConstant.cpp", 11662, __extension__ __PRETTY_FUNCTION__)); | |||
11663 | return true; | |||
11664 | } | |||
11665 | ||||
11666 | bool IntExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E, | |||
11667 | unsigned BuiltinOp) { | |||
11668 | switch (BuiltinOp) { | |||
11669 | default: | |||
11670 | return ExprEvaluatorBaseTy::VisitCallExpr(E); | |||
11671 | ||||
11672 | case Builtin::BI__builtin_dynamic_object_size: | |||
11673 | case Builtin::BI__builtin_object_size: { | |||
11674 | // The type was checked when we built the expression. | |||
11675 | unsigned Type = | |||
11676 | E->getArg(1)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); | |||
11677 | assert(Type <= 3 && "unexpected type")(static_cast <bool> (Type <= 3 && "unexpected type" ) ? void (0) : __assert_fail ("Type <= 3 && \"unexpected type\"" , "clang/lib/AST/ExprConstant.cpp", 11677, __extension__ __PRETTY_FUNCTION__ )); | |||
11678 | ||||
11679 | uint64_t Size; | |||
11680 | if (tryEvaluateBuiltinObjectSize(E->getArg(0), Type, Info, Size)) | |||
11681 | return Success(Size, E); | |||
11682 | ||||
11683 | if (E->getArg(0)->HasSideEffects(Info.Ctx)) | |||
11684 | return Success((Type & 2) ? 0 : -1, E); | |||
11685 | ||||
11686 | // Expression had no side effects, but we couldn't statically determine the | |||
11687 | // size of the referenced object. | |||
11688 | switch (Info.EvalMode) { | |||
11689 | case EvalInfo::EM_ConstantExpression: | |||
11690 | case EvalInfo::EM_ConstantFold: | |||
11691 | case EvalInfo::EM_IgnoreSideEffects: | |||
11692 | // Leave it to IR generation. | |||
11693 | return Error(E); | |||
11694 | case EvalInfo::EM_ConstantExpressionUnevaluated: | |||
11695 | // Reduce it to a constant now. | |||
11696 | return Success((Type & 2) ? 0 : -1, E); | |||
11697 | } | |||
11698 | ||||
11699 | llvm_unreachable("unexpected EvalMode")::llvm::llvm_unreachable_internal("unexpected EvalMode", "clang/lib/AST/ExprConstant.cpp" , 11699); | |||
11700 | } | |||
11701 | ||||
11702 | case Builtin::BI__builtin_os_log_format_buffer_size: { | |||
11703 | analyze_os_log::OSLogBufferLayout Layout; | |||
11704 | analyze_os_log::computeOSLogBufferLayout(Info.Ctx, E, Layout); | |||
11705 | return Success(Layout.size().getQuantity(), E); | |||
11706 | } | |||
11707 | ||||
11708 | case Builtin::BI__builtin_is_aligned: { | |||
11709 | APValue Src; | |||
11710 | APSInt Alignment; | |||
11711 | if (!getBuiltinAlignArguments(E, Info, Src, Alignment)) | |||
11712 | return false; | |||
11713 | if (Src.isLValue()) { | |||
11714 | // If we evaluated a pointer, check the minimum known alignment. | |||
11715 | LValue Ptr; | |||
11716 | Ptr.setFrom(Info.Ctx, Src); | |||
11717 | CharUnits BaseAlignment = getBaseAlignment(Info, Ptr); | |||
11718 | CharUnits PtrAlign = BaseAlignment.alignmentAtOffset(Ptr.Offset); | |||
11719 | // We can return true if the known alignment at the computed offset is | |||
11720 | // greater than the requested alignment. | |||
11721 | assert(PtrAlign.isPowerOfTwo())(static_cast <bool> (PtrAlign.isPowerOfTwo()) ? void (0 ) : __assert_fail ("PtrAlign.isPowerOfTwo()", "clang/lib/AST/ExprConstant.cpp" , 11721, __extension__ __PRETTY_FUNCTION__)); | |||
11722 | assert(Alignment.isPowerOf2())(static_cast <bool> (Alignment.isPowerOf2()) ? void (0) : __assert_fail ("Alignment.isPowerOf2()", "clang/lib/AST/ExprConstant.cpp" , 11722, __extension__ __PRETTY_FUNCTION__)); | |||
11723 | if (PtrAlign.getQuantity() >= Alignment) | |||
11724 | return Success(1, E); | |||
11725 | // If the alignment is not known to be sufficient, some cases could still | |||
11726 | // be aligned at run time. However, if the requested alignment is less or | |||
11727 | // equal to the base alignment and the offset is not aligned, we know that | |||
11728 | // the run-time value can never be aligned. | |||
11729 | if (BaseAlignment.getQuantity() >= Alignment && | |||
11730 | PtrAlign.getQuantity() < Alignment) | |||
11731 | return Success(0, E); | |||
11732 | // Otherwise we can't infer whether the value is sufficiently aligned. | |||
11733 | // TODO: __builtin_is_aligned(__builtin_align_{down,up{(expr, N), N) | |||
11734 | // in cases where we can't fully evaluate the pointer. | |||
11735 | Info.FFDiag(E->getArg(0), diag::note_constexpr_alignment_compute) | |||
11736 | << Alignment; | |||
11737 | return false; | |||
11738 | } | |||
11739 | assert(Src.isInt())(static_cast <bool> (Src.isInt()) ? void (0) : __assert_fail ("Src.isInt()", "clang/lib/AST/ExprConstant.cpp", 11739, __extension__ __PRETTY_FUNCTION__)); | |||
11740 | return Success((Src.getInt() & (Alignment - 1)) == 0 ? 1 : 0, E); | |||
11741 | } | |||
11742 | case Builtin::BI__builtin_align_up: { | |||
11743 | APValue Src; | |||
11744 | APSInt Alignment; | |||
11745 | if (!getBuiltinAlignArguments(E, Info, Src, Alignment)) | |||
11746 | return false; | |||
11747 | if (!Src.isInt()) | |||
11748 | return Error(E); | |||
11749 | APSInt AlignedVal = | |||
11750 | APSInt((Src.getInt() + (Alignment - 1)) & ~(Alignment - 1), | |||
11751 | Src.getInt().isUnsigned()); | |||
11752 | assert(AlignedVal.getBitWidth() == Src.getInt().getBitWidth())(static_cast <bool> (AlignedVal.getBitWidth() == Src.getInt ().getBitWidth()) ? void (0) : __assert_fail ("AlignedVal.getBitWidth() == Src.getInt().getBitWidth()" , "clang/lib/AST/ExprConstant.cpp", 11752, __extension__ __PRETTY_FUNCTION__ )); | |||
11753 | return Success(AlignedVal, E); | |||
11754 | } | |||
11755 | case Builtin::BI__builtin_align_down: { | |||
11756 | APValue Src; | |||
11757 | APSInt Alignment; | |||
11758 | if (!getBuiltinAlignArguments(E, Info, Src, Alignment)) | |||
11759 | return false; | |||
11760 | if (!Src.isInt()) | |||
11761 | return Error(E); | |||
11762 | APSInt AlignedVal = | |||
11763 | APSInt(Src.getInt() & ~(Alignment - 1), Src.getInt().isUnsigned()); | |||
11764 | assert(AlignedVal.getBitWidth() == Src.getInt().getBitWidth())(static_cast <bool> (AlignedVal.getBitWidth() == Src.getInt ().getBitWidth()) ? void (0) : __assert_fail ("AlignedVal.getBitWidth() == Src.getInt().getBitWidth()" , "clang/lib/AST/ExprConstant.cpp", 11764, __extension__ __PRETTY_FUNCTION__ )); | |||
11765 | return Success(AlignedVal, E); | |||
11766 | } | |||
11767 | ||||
11768 | case Builtin::BI__builtin_bitreverse8: | |||
11769 | case Builtin::BI__builtin_bitreverse16: | |||
11770 | case Builtin::BI__builtin_bitreverse32: | |||
11771 | case Builtin::BI__builtin_bitreverse64: { | |||
11772 | APSInt Val; | |||
11773 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | |||
11774 | return false; | |||
11775 | ||||
11776 | return Success(Val.reverseBits(), E); | |||
11777 | } | |||
11778 | ||||
11779 | case Builtin::BI__builtin_bswap16: | |||
11780 | case Builtin::BI__builtin_bswap32: | |||
11781 | case Builtin::BI__builtin_bswap64: { | |||
11782 | APSInt Val; | |||
11783 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | |||
11784 | return false; | |||
11785 | ||||
11786 | return Success(Val.byteSwap(), E); | |||
11787 | } | |||
11788 | ||||
11789 | case Builtin::BI__builtin_classify_type: | |||
11790 | return Success((int)EvaluateBuiltinClassifyType(E, Info.getLangOpts()), E); | |||
11791 | ||||
11792 | case Builtin::BI__builtin_clrsb: | |||
11793 | case Builtin::BI__builtin_clrsbl: | |||
11794 | case Builtin::BI__builtin_clrsbll: { | |||
11795 | APSInt Val; | |||
11796 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | |||
11797 | return false; | |||
11798 | ||||
11799 | return Success(Val.getBitWidth() - Val.getMinSignedBits(), E); | |||
11800 | } | |||
11801 | ||||
11802 | case Builtin::BI__builtin_clz: | |||
11803 | case Builtin::BI__builtin_clzl: | |||
11804 | case Builtin::BI__builtin_clzll: | |||
11805 | case Builtin::BI__builtin_clzs: { | |||
11806 | APSInt Val; | |||
11807 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | |||
11808 | return false; | |||
11809 | if (!Val) | |||
11810 | return Error(E); | |||
11811 | ||||
11812 | return Success(Val.countLeadingZeros(), E); | |||
11813 | } | |||
11814 | ||||
11815 | case Builtin::BI__builtin_constant_p: { | |||
11816 | const Expr *Arg = E->getArg(0); | |||
11817 | if (EvaluateBuiltinConstantP(Info, Arg)) | |||
11818 | return Success(true, E); | |||
11819 | if (Info.InConstantContext || Arg->HasSideEffects(Info.Ctx)) { | |||
11820 | // Outside a constant context, eagerly evaluate to false in the presence | |||
11821 | // of side-effects in order to avoid -Wunsequenced false-positives in | |||
11822 | // a branch on __builtin_constant_p(expr). | |||
11823 | return Success(false, E); | |||
11824 | } | |||
11825 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
11826 | return false; | |||
11827 | } | |||
11828 | ||||
11829 | case Builtin::BI__builtin_is_constant_evaluated: { | |||
11830 | const auto *Callee = Info.CurrentCall->getCallee(); | |||
11831 | if (Info.InConstantContext && !Info.CheckingPotentialConstantExpression && | |||
11832 | (Info.CallStackDepth == 1 || | |||
11833 | (Info.CallStackDepth == 2 && Callee->isInStdNamespace() && | |||
11834 | Callee->getIdentifier() && | |||
11835 | Callee->getIdentifier()->isStr("is_constant_evaluated")))) { | |||
11836 | // FIXME: Find a better way to avoid duplicated diagnostics. | |||
11837 | if (Info.EvalStatus.Diag) | |||
11838 | Info.report((Info.CallStackDepth == 1) ? E->getExprLoc() | |||
11839 | : Info.CurrentCall->CallLoc, | |||
11840 | diag::warn_is_constant_evaluated_always_true_constexpr) | |||
11841 | << (Info.CallStackDepth == 1 ? "__builtin_is_constant_evaluated" | |||
11842 | : "std::is_constant_evaluated"); | |||
11843 | } | |||
11844 | ||||
11845 | return Success(Info.InConstantContext, E); | |||
11846 | } | |||
11847 | ||||
11848 | case Builtin::BI__builtin_ctz: | |||
11849 | case Builtin::BI__builtin_ctzl: | |||
11850 | case Builtin::BI__builtin_ctzll: | |||
11851 | case Builtin::BI__builtin_ctzs: { | |||
11852 | APSInt Val; | |||
11853 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | |||
11854 | return false; | |||
11855 | if (!Val) | |||
11856 | return Error(E); | |||
11857 | ||||
11858 | return Success(Val.countTrailingZeros(), E); | |||
11859 | } | |||
11860 | ||||
11861 | case Builtin::BI__builtin_eh_return_data_regno: { | |||
11862 | int Operand = E->getArg(0)->EvaluateKnownConstInt(Info.Ctx).getZExtValue(); | |||
11863 | Operand = Info.Ctx.getTargetInfo().getEHDataRegisterNumber(Operand); | |||
11864 | return Success(Operand, E); | |||
11865 | } | |||
11866 | ||||
11867 | case Builtin::BI__builtin_expect: | |||
11868 | case Builtin::BI__builtin_expect_with_probability: | |||
11869 | return Visit(E->getArg(0)); | |||
11870 | ||||
11871 | case Builtin::BI__builtin_ffs: | |||
11872 | case Builtin::BI__builtin_ffsl: | |||
11873 | case Builtin::BI__builtin_ffsll: { | |||
11874 | APSInt Val; | |||
11875 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | |||
11876 | return false; | |||
11877 | ||||
11878 | unsigned N = Val.countTrailingZeros(); | |||
11879 | return Success(N == Val.getBitWidth() ? 0 : N + 1, E); | |||
11880 | } | |||
11881 | ||||
11882 | case Builtin::BI__builtin_fpclassify: { | |||
11883 | APFloat Val(0.0); | |||
11884 | if (!EvaluateFloat(E->getArg(5), Val, Info)) | |||
11885 | return false; | |||
11886 | unsigned Arg; | |||
11887 | switch (Val.getCategory()) { | |||
11888 | case APFloat::fcNaN: Arg = 0; break; | |||
11889 | case APFloat::fcInfinity: Arg = 1; break; | |||
11890 | case APFloat::fcNormal: Arg = Val.isDenormal() ? 3 : 2; break; | |||
11891 | case APFloat::fcZero: Arg = 4; break; | |||
11892 | } | |||
11893 | return Visit(E->getArg(Arg)); | |||
11894 | } | |||
11895 | ||||
11896 | case Builtin::BI__builtin_isinf_sign: { | |||
11897 | APFloat Val(0.0); | |||
11898 | return EvaluateFloat(E->getArg(0), Val, Info) && | |||
11899 | Success(Val.isInfinity() ? (Val.isNegative() ? -1 : 1) : 0, E); | |||
11900 | } | |||
11901 | ||||
11902 | case Builtin::BI__builtin_isinf: { | |||
11903 | APFloat Val(0.0); | |||
11904 | return EvaluateFloat(E->getArg(0), Val, Info) && | |||
11905 | Success(Val.isInfinity() ? 1 : 0, E); | |||
11906 | } | |||
11907 | ||||
11908 | case Builtin::BI__builtin_isfinite: { | |||
11909 | APFloat Val(0.0); | |||
11910 | return EvaluateFloat(E->getArg(0), Val, Info) && | |||
11911 | Success(Val.isFinite() ? 1 : 0, E); | |||
11912 | } | |||
11913 | ||||
11914 | case Builtin::BI__builtin_isnan: { | |||
11915 | APFloat Val(0.0); | |||
11916 | return EvaluateFloat(E->getArg(0), Val, Info) && | |||
11917 | Success(Val.isNaN() ? 1 : 0, E); | |||
11918 | } | |||
11919 | ||||
11920 | case Builtin::BI__builtin_isnormal: { | |||
11921 | APFloat Val(0.0); | |||
11922 | return EvaluateFloat(E->getArg(0), Val, Info) && | |||
11923 | Success(Val.isNormal() ? 1 : 0, E); | |||
11924 | } | |||
11925 | ||||
11926 | case Builtin::BI__builtin_parity: | |||
11927 | case Builtin::BI__builtin_parityl: | |||
11928 | case Builtin::BI__builtin_parityll: { | |||
11929 | APSInt Val; | |||
11930 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | |||
11931 | return false; | |||
11932 | ||||
11933 | return Success(Val.countPopulation() % 2, E); | |||
11934 | } | |||
11935 | ||||
11936 | case Builtin::BI__builtin_popcount: | |||
11937 | case Builtin::BI__builtin_popcountl: | |||
11938 | case Builtin::BI__builtin_popcountll: { | |||
11939 | APSInt Val; | |||
11940 | if (!EvaluateInteger(E->getArg(0), Val, Info)) | |||
11941 | return false; | |||
11942 | ||||
11943 | return Success(Val.countPopulation(), E); | |||
11944 | } | |||
11945 | ||||
11946 | case Builtin::BI__builtin_rotateleft8: | |||
11947 | case Builtin::BI__builtin_rotateleft16: | |||
11948 | case Builtin::BI__builtin_rotateleft32: | |||
11949 | case Builtin::BI__builtin_rotateleft64: | |||
11950 | case Builtin::BI_rotl8: // Microsoft variants of rotate right | |||
11951 | case Builtin::BI_rotl16: | |||
11952 | case Builtin::BI_rotl: | |||
11953 | case Builtin::BI_lrotl: | |||
11954 | case Builtin::BI_rotl64: { | |||
11955 | APSInt Val, Amt; | |||
11956 | if (!EvaluateInteger(E->getArg(0), Val, Info) || | |||
11957 | !EvaluateInteger(E->getArg(1), Amt, Info)) | |||
11958 | return false; | |||
11959 | ||||
11960 | return Success(Val.rotl(Amt.urem(Val.getBitWidth())), E); | |||
11961 | } | |||
11962 | ||||
11963 | case Builtin::BI__builtin_rotateright8: | |||
11964 | case Builtin::BI__builtin_rotateright16: | |||
11965 | case Builtin::BI__builtin_rotateright32: | |||
11966 | case Builtin::BI__builtin_rotateright64: | |||
11967 | case Builtin::BI_rotr8: // Microsoft variants of rotate right | |||
11968 | case Builtin::BI_rotr16: | |||
11969 | case Builtin::BI_rotr: | |||
11970 | case Builtin::BI_lrotr: | |||
11971 | case Builtin::BI_rotr64: { | |||
11972 | APSInt Val, Amt; | |||
11973 | if (!EvaluateInteger(E->getArg(0), Val, Info) || | |||
11974 | !EvaluateInteger(E->getArg(1), Amt, Info)) | |||
11975 | return false; | |||
11976 | ||||
11977 | return Success(Val.rotr(Amt.urem(Val.getBitWidth())), E); | |||
11978 | } | |||
11979 | ||||
11980 | case Builtin::BIstrlen: | |||
11981 | case Builtin::BIwcslen: | |||
11982 | // A call to strlen is not a constant expression. | |||
11983 | if (Info.getLangOpts().CPlusPlus11) | |||
11984 | Info.CCEDiag(E, diag::note_constexpr_invalid_function) | |||
11985 | << /*isConstexpr*/0 << /*isConstructor*/0 | |||
11986 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'"); | |||
11987 | else | |||
11988 | Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
11989 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
11990 | case Builtin::BI__builtin_strlen: | |||
11991 | case Builtin::BI__builtin_wcslen: { | |||
11992 | // As an extension, we support __builtin_strlen() as a constant expression, | |||
11993 | // and support folding strlen() to a constant. | |||
11994 | uint64_t StrLen; | |||
11995 | if (EvaluateBuiltinStrLen(E->getArg(0), StrLen, Info)) | |||
11996 | return Success(StrLen, E); | |||
11997 | return false; | |||
11998 | } | |||
11999 | ||||
12000 | case Builtin::BIstrcmp: | |||
12001 | case Builtin::BIwcscmp: | |||
12002 | case Builtin::BIstrncmp: | |||
12003 | case Builtin::BIwcsncmp: | |||
12004 | case Builtin::BImemcmp: | |||
12005 | case Builtin::BIbcmp: | |||
12006 | case Builtin::BIwmemcmp: | |||
12007 | // A call to strlen is not a constant expression. | |||
12008 | if (Info.getLangOpts().CPlusPlus11) | |||
12009 | Info.CCEDiag(E, diag::note_constexpr_invalid_function) | |||
12010 | << /*isConstexpr*/0 << /*isConstructor*/0 | |||
12011 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'"); | |||
12012 | else | |||
12013 | Info.CCEDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
12014 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
12015 | case Builtin::BI__builtin_strcmp: | |||
12016 | case Builtin::BI__builtin_wcscmp: | |||
12017 | case Builtin::BI__builtin_strncmp: | |||
12018 | case Builtin::BI__builtin_wcsncmp: | |||
12019 | case Builtin::BI__builtin_memcmp: | |||
12020 | case Builtin::BI__builtin_bcmp: | |||
12021 | case Builtin::BI__builtin_wmemcmp: { | |||
12022 | LValue String1, String2; | |||
12023 | if (!EvaluatePointer(E->getArg(0), String1, Info) || | |||
12024 | !EvaluatePointer(E->getArg(1), String2, Info)) | |||
12025 | return false; | |||
12026 | ||||
12027 | uint64_t MaxLength = uint64_t(-1); | |||
12028 | if (BuiltinOp != Builtin::BIstrcmp && | |||
12029 | BuiltinOp != Builtin::BIwcscmp && | |||
12030 | BuiltinOp != Builtin::BI__builtin_strcmp && | |||
12031 | BuiltinOp != Builtin::BI__builtin_wcscmp) { | |||
12032 | APSInt N; | |||
12033 | if (!EvaluateInteger(E->getArg(2), N, Info)) | |||
12034 | return false; | |||
12035 | MaxLength = N.getExtValue(); | |||
12036 | } | |||
12037 | ||||
12038 | // Empty substrings compare equal by definition. | |||
12039 | if (MaxLength == 0u) | |||
12040 | return Success(0, E); | |||
12041 | ||||
12042 | if (!String1.checkNullPointerForFoldAccess(Info, E, AK_Read) || | |||
12043 | !String2.checkNullPointerForFoldAccess(Info, E, AK_Read) || | |||
12044 | String1.Designator.Invalid || String2.Designator.Invalid) | |||
12045 | return false; | |||
12046 | ||||
12047 | QualType CharTy1 = String1.Designator.getType(Info.Ctx); | |||
12048 | QualType CharTy2 = String2.Designator.getType(Info.Ctx); | |||
12049 | ||||
12050 | bool IsRawByte = BuiltinOp == Builtin::BImemcmp || | |||
12051 | BuiltinOp == Builtin::BIbcmp || | |||
12052 | BuiltinOp == Builtin::BI__builtin_memcmp || | |||
12053 | BuiltinOp == Builtin::BI__builtin_bcmp; | |||
12054 | ||||
12055 | assert(IsRawByte ||(static_cast <bool> (IsRawByte || (Info.Ctx.hasSameUnqualifiedType ( CharTy1, E->getArg(0)->getType()->getPointeeType() ) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2 ))) ? void (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))" , "clang/lib/AST/ExprConstant.cpp", 12058, __extension__ __PRETTY_FUNCTION__ )) | |||
12056 | (Info.Ctx.hasSameUnqualifiedType((static_cast <bool> (IsRawByte || (Info.Ctx.hasSameUnqualifiedType ( CharTy1, E->getArg(0)->getType()->getPointeeType() ) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2 ))) ? void (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))" , "clang/lib/AST/ExprConstant.cpp", 12058, __extension__ __PRETTY_FUNCTION__ )) | |||
12057 | CharTy1, E->getArg(0)->getType()->getPointeeType()) &&(static_cast <bool> (IsRawByte || (Info.Ctx.hasSameUnqualifiedType ( CharTy1, E->getArg(0)->getType()->getPointeeType() ) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2 ))) ? void (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))" , "clang/lib/AST/ExprConstant.cpp", 12058, __extension__ __PRETTY_FUNCTION__ )) | |||
12058 | Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2)))(static_cast <bool> (IsRawByte || (Info.Ctx.hasSameUnqualifiedType ( CharTy1, E->getArg(0)->getType()->getPointeeType() ) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2 ))) ? void (0) : __assert_fail ("IsRawByte || (Info.Ctx.hasSameUnqualifiedType( CharTy1, E->getArg(0)->getType()->getPointeeType()) && Info.Ctx.hasSameUnqualifiedType(CharTy1, CharTy2))" , "clang/lib/AST/ExprConstant.cpp", 12058, __extension__ __PRETTY_FUNCTION__ )); | |||
12059 | ||||
12060 | // For memcmp, allow comparing any arrays of '[[un]signed] char' or | |||
12061 | // 'char8_t', but no other types. | |||
12062 | if (IsRawByte && | |||
12063 | !(isOneByteCharacterType(CharTy1) && isOneByteCharacterType(CharTy2))) { | |||
12064 | // FIXME: Consider using our bit_cast implementation to support this. | |||
12065 | Info.FFDiag(E, diag::note_constexpr_memcmp_unsupported) | |||
12066 | << (std::string("'") + Info.Ctx.BuiltinInfo.getName(BuiltinOp) + "'") | |||
12067 | << CharTy1 << CharTy2; | |||
12068 | return false; | |||
12069 | } | |||
12070 | ||||
12071 | const auto &ReadCurElems = [&](APValue &Char1, APValue &Char2) { | |||
12072 | return handleLValueToRValueConversion(Info, E, CharTy1, String1, Char1) && | |||
12073 | handleLValueToRValueConversion(Info, E, CharTy2, String2, Char2) && | |||
12074 | Char1.isInt() && Char2.isInt(); | |||
12075 | }; | |||
12076 | const auto &AdvanceElems = [&] { | |||
12077 | return HandleLValueArrayAdjustment(Info, E, String1, CharTy1, 1) && | |||
12078 | HandleLValueArrayAdjustment(Info, E, String2, CharTy2, 1); | |||
12079 | }; | |||
12080 | ||||
12081 | bool StopAtNull = | |||
12082 | (BuiltinOp != Builtin::BImemcmp && BuiltinOp != Builtin::BIbcmp && | |||
12083 | BuiltinOp != Builtin::BIwmemcmp && | |||
12084 | BuiltinOp != Builtin::BI__builtin_memcmp && | |||
12085 | BuiltinOp != Builtin::BI__builtin_bcmp && | |||
12086 | BuiltinOp != Builtin::BI__builtin_wmemcmp); | |||
12087 | bool IsWide = BuiltinOp == Builtin::BIwcscmp || | |||
12088 | BuiltinOp == Builtin::BIwcsncmp || | |||
12089 | BuiltinOp == Builtin::BIwmemcmp || | |||
12090 | BuiltinOp == Builtin::BI__builtin_wcscmp || | |||
12091 | BuiltinOp == Builtin::BI__builtin_wcsncmp || | |||
12092 | BuiltinOp == Builtin::BI__builtin_wmemcmp; | |||
12093 | ||||
12094 | for (; MaxLength; --MaxLength) { | |||
12095 | APValue Char1, Char2; | |||
12096 | if (!ReadCurElems(Char1, Char2)) | |||
12097 | return false; | |||
12098 | if (Char1.getInt().ne(Char2.getInt())) { | |||
12099 | if (IsWide) // wmemcmp compares with wchar_t signedness. | |||
12100 | return Success(Char1.getInt() < Char2.getInt() ? -1 : 1, E); | |||
12101 | // memcmp always compares unsigned chars. | |||
12102 | return Success(Char1.getInt().ult(Char2.getInt()) ? -1 : 1, E); | |||
12103 | } | |||
12104 | if (StopAtNull && !Char1.getInt()) | |||
12105 | return Success(0, E); | |||
12106 | assert(!(StopAtNull && !Char2.getInt()))(static_cast <bool> (!(StopAtNull && !Char2.getInt ())) ? void (0) : __assert_fail ("!(StopAtNull && !Char2.getInt())" , "clang/lib/AST/ExprConstant.cpp", 12106, __extension__ __PRETTY_FUNCTION__ )); | |||
12107 | if (!AdvanceElems()) | |||
12108 | return false; | |||
12109 | } | |||
12110 | // We hit the strncmp / memcmp limit. | |||
12111 | return Success(0, E); | |||
12112 | } | |||
12113 | ||||
12114 | case Builtin::BI__atomic_always_lock_free: | |||
12115 | case Builtin::BI__atomic_is_lock_free: | |||
12116 | case Builtin::BI__c11_atomic_is_lock_free: { | |||
12117 | APSInt SizeVal; | |||
12118 | if (!EvaluateInteger(E->getArg(0), SizeVal, Info)) | |||
12119 | return false; | |||
12120 | ||||
12121 | // For __atomic_is_lock_free(sizeof(_Atomic(T))), if the size is a power | |||
12122 | // of two less than or equal to the maximum inline atomic width, we know it | |||
12123 | // is lock-free. If the size isn't a power of two, or greater than the | |||
12124 | // maximum alignment where we promote atomics, we know it is not lock-free | |||
12125 | // (at least not in the sense of atomic_is_lock_free). Otherwise, | |||
12126 | // the answer can only be determined at runtime; for example, 16-byte | |||
12127 | // atomics have lock-free implementations on some, but not all, | |||
12128 | // x86-64 processors. | |||
12129 | ||||
12130 | // Check power-of-two. | |||
12131 | CharUnits Size = CharUnits::fromQuantity(SizeVal.getZExtValue()); | |||
12132 | if (Size.isPowerOfTwo()) { | |||
12133 | // Check against inlining width. | |||
12134 | unsigned InlineWidthBits = | |||
12135 | Info.Ctx.getTargetInfo().getMaxAtomicInlineWidth(); | |||
12136 | if (Size <= Info.Ctx.toCharUnitsFromBits(InlineWidthBits)) { | |||
12137 | if (BuiltinOp == Builtin::BI__c11_atomic_is_lock_free || | |||
12138 | Size == CharUnits::One() || | |||
12139 | E->getArg(1)->isNullPointerConstant(Info.Ctx, | |||
12140 | Expr::NPC_NeverValueDependent)) | |||
12141 | // OK, we will inline appropriately-aligned operations of this size, | |||
12142 | // and _Atomic(T) is appropriately-aligned. | |||
12143 | return Success(1, E); | |||
12144 | ||||
12145 | QualType PointeeType = E->getArg(1)->IgnoreImpCasts()->getType()-> | |||
12146 | castAs<PointerType>()->getPointeeType(); | |||
12147 | if (!PointeeType->isIncompleteType() && | |||
12148 | Info.Ctx.getTypeAlignInChars(PointeeType) >= Size) { | |||
12149 | // OK, we will inline operations on this object. | |||
12150 | return Success(1, E); | |||
12151 | } | |||
12152 | } | |||
12153 | } | |||
12154 | ||||
12155 | return BuiltinOp == Builtin::BI__atomic_always_lock_free ? | |||
12156 | Success(0, E) : Error(E); | |||
12157 | } | |||
12158 | case Builtin::BI__builtin_add_overflow: | |||
12159 | case Builtin::BI__builtin_sub_overflow: | |||
12160 | case Builtin::BI__builtin_mul_overflow: | |||
12161 | case Builtin::BI__builtin_sadd_overflow: | |||
12162 | case Builtin::BI__builtin_uadd_overflow: | |||
12163 | case Builtin::BI__builtin_uaddl_overflow: | |||
12164 | case Builtin::BI__builtin_uaddll_overflow: | |||
12165 | case Builtin::BI__builtin_usub_overflow: | |||
12166 | case Builtin::BI__builtin_usubl_overflow: | |||
12167 | case Builtin::BI__builtin_usubll_overflow: | |||
12168 | case Builtin::BI__builtin_umul_overflow: | |||
12169 | case Builtin::BI__builtin_umull_overflow: | |||
12170 | case Builtin::BI__builtin_umulll_overflow: | |||
12171 | case Builtin::BI__builtin_saddl_overflow: | |||
12172 | case Builtin::BI__builtin_saddll_overflow: | |||
12173 | case Builtin::BI__builtin_ssub_overflow: | |||
12174 | case Builtin::BI__builtin_ssubl_overflow: | |||
12175 | case Builtin::BI__builtin_ssubll_overflow: | |||
12176 | case Builtin::BI__builtin_smul_overflow: | |||
12177 | case Builtin::BI__builtin_smull_overflow: | |||
12178 | case Builtin::BI__builtin_smulll_overflow: { | |||
12179 | LValue ResultLValue; | |||
12180 | APSInt LHS, RHS; | |||
12181 | ||||
12182 | QualType ResultType = E->getArg(2)->getType()->getPointeeType(); | |||
12183 | if (!EvaluateInteger(E->getArg(0), LHS, Info) || | |||
12184 | !EvaluateInteger(E->getArg(1), RHS, Info) || | |||
12185 | !EvaluatePointer(E->getArg(2), ResultLValue, Info)) | |||
12186 | return false; | |||
12187 | ||||
12188 | APSInt Result; | |||
12189 | bool DidOverflow = false; | |||
12190 | ||||
12191 | // If the types don't have to match, enlarge all 3 to the largest of them. | |||
12192 | if (BuiltinOp == Builtin::BI__builtin_add_overflow || | |||
12193 | BuiltinOp == Builtin::BI__builtin_sub_overflow || | |||
12194 | BuiltinOp == Builtin::BI__builtin_mul_overflow) { | |||
12195 | bool IsSigned = LHS.isSigned() || RHS.isSigned() || | |||
12196 | ResultType->isSignedIntegerOrEnumerationType(); | |||
12197 | bool AllSigned = LHS.isSigned() && RHS.isSigned() && | |||
12198 | ResultType->isSignedIntegerOrEnumerationType(); | |||
12199 | uint64_t LHSSize = LHS.getBitWidth(); | |||
12200 | uint64_t RHSSize = RHS.getBitWidth(); | |||
12201 | uint64_t ResultSize = Info.Ctx.getTypeSize(ResultType); | |||
12202 | uint64_t MaxBits = std::max(std::max(LHSSize, RHSSize), ResultSize); | |||
12203 | ||||
12204 | // Add an additional bit if the signedness isn't uniformly agreed to. We | |||
12205 | // could do this ONLY if there is a signed and an unsigned that both have | |||
12206 | // MaxBits, but the code to check that is pretty nasty. The issue will be | |||
12207 | // caught in the shrink-to-result later anyway. | |||
12208 | if (IsSigned && !AllSigned) | |||
12209 | ++MaxBits; | |||
12210 | ||||
12211 | LHS = APSInt(LHS.extOrTrunc(MaxBits), !IsSigned); | |||
12212 | RHS = APSInt(RHS.extOrTrunc(MaxBits), !IsSigned); | |||
12213 | Result = APSInt(MaxBits, !IsSigned); | |||
12214 | } | |||
12215 | ||||
12216 | // Find largest int. | |||
12217 | switch (BuiltinOp) { | |||
12218 | default: | |||
12219 | llvm_unreachable("Invalid value for BuiltinOp")::llvm::llvm_unreachable_internal("Invalid value for BuiltinOp" , "clang/lib/AST/ExprConstant.cpp", 12219); | |||
12220 | case Builtin::BI__builtin_add_overflow: | |||
12221 | case Builtin::BI__builtin_sadd_overflow: | |||
12222 | case Builtin::BI__builtin_saddl_overflow: | |||
12223 | case Builtin::BI__builtin_saddll_overflow: | |||
12224 | case Builtin::BI__builtin_uadd_overflow: | |||
12225 | case Builtin::BI__builtin_uaddl_overflow: | |||
12226 | case Builtin::BI__builtin_uaddll_overflow: | |||
12227 | Result = LHS.isSigned() ? LHS.sadd_ov(RHS, DidOverflow) | |||
12228 | : LHS.uadd_ov(RHS, DidOverflow); | |||
12229 | break; | |||
12230 | case Builtin::BI__builtin_sub_overflow: | |||
12231 | case Builtin::BI__builtin_ssub_overflow: | |||
12232 | case Builtin::BI__builtin_ssubl_overflow: | |||
12233 | case Builtin::BI__builtin_ssubll_overflow: | |||
12234 | case Builtin::BI__builtin_usub_overflow: | |||
12235 | case Builtin::BI__builtin_usubl_overflow: | |||
12236 | case Builtin::BI__builtin_usubll_overflow: | |||
12237 | Result = LHS.isSigned() ? LHS.ssub_ov(RHS, DidOverflow) | |||
12238 | : LHS.usub_ov(RHS, DidOverflow); | |||
12239 | break; | |||
12240 | case Builtin::BI__builtin_mul_overflow: | |||
12241 | case Builtin::BI__builtin_smul_overflow: | |||
12242 | case Builtin::BI__builtin_smull_overflow: | |||
12243 | case Builtin::BI__builtin_smulll_overflow: | |||
12244 | case Builtin::BI__builtin_umul_overflow: | |||
12245 | case Builtin::BI__builtin_umull_overflow: | |||
12246 | case Builtin::BI__builtin_umulll_overflow: | |||
12247 | Result = LHS.isSigned() ? LHS.smul_ov(RHS, DidOverflow) | |||
12248 | : LHS.umul_ov(RHS, DidOverflow); | |||
12249 | break; | |||
12250 | } | |||
12251 | ||||
12252 | // In the case where multiple sizes are allowed, truncate and see if | |||
12253 | // the values are the same. | |||
12254 | if (BuiltinOp == Builtin::BI__builtin_add_overflow || | |||
12255 | BuiltinOp == Builtin::BI__builtin_sub_overflow || | |||
12256 | BuiltinOp == Builtin::BI__builtin_mul_overflow) { | |||
12257 | // APSInt doesn't have a TruncOrSelf, so we use extOrTrunc instead, | |||
12258 | // since it will give us the behavior of a TruncOrSelf in the case where | |||
12259 | // its parameter <= its size. We previously set Result to be at least the | |||
12260 | // type-size of the result, so getTypeSize(ResultType) <= Result.BitWidth | |||
12261 | // will work exactly like TruncOrSelf. | |||
12262 | APSInt Temp = Result.extOrTrunc(Info.Ctx.getTypeSize(ResultType)); | |||
12263 | Temp.setIsSigned(ResultType->isSignedIntegerOrEnumerationType()); | |||
12264 | ||||
12265 | if (!APSInt::isSameValue(Temp, Result)) | |||
12266 | DidOverflow = true; | |||
12267 | Result = Temp; | |||
12268 | } | |||
12269 | ||||
12270 | APValue APV{Result}; | |||
12271 | if (!handleAssignment(Info, E, ResultLValue, ResultType, APV)) | |||
12272 | return false; | |||
12273 | return Success(DidOverflow, E); | |||
12274 | } | |||
12275 | } | |||
12276 | } | |||
12277 | ||||
12278 | /// Determine whether this is a pointer past the end of the complete | |||
12279 | /// object referred to by the lvalue. | |||
12280 | static bool isOnePastTheEndOfCompleteObject(const ASTContext &Ctx, | |||
12281 | const LValue &LV) { | |||
12282 | // A null pointer can be viewed as being "past the end" but we don't | |||
12283 | // choose to look at it that way here. | |||
12284 | if (!LV.getLValueBase()) | |||
12285 | return false; | |||
12286 | ||||
12287 | // If the designator is valid and refers to a subobject, we're not pointing | |||
12288 | // past the end. | |||
12289 | if (!LV.getLValueDesignator().Invalid && | |||
12290 | !LV.getLValueDesignator().isOnePastTheEnd()) | |||
12291 | return false; | |||
12292 | ||||
12293 | // A pointer to an incomplete type might be past-the-end if the type's size is | |||
12294 | // zero. We cannot tell because the type is incomplete. | |||
12295 | QualType Ty = getType(LV.getLValueBase()); | |||
12296 | if (Ty->isIncompleteType()) | |||
12297 | return true; | |||
12298 | ||||
12299 | // We're a past-the-end pointer if we point to the byte after the object, | |||
12300 | // no matter what our type or path is. | |||
12301 | auto Size = Ctx.getTypeSizeInChars(Ty); | |||
12302 | return LV.getLValueOffset() == Size; | |||
12303 | } | |||
12304 | ||||
12305 | namespace { | |||
12306 | ||||
12307 | /// Data recursive integer evaluator of certain binary operators. | |||
12308 | /// | |||
12309 | /// We use a data recursive algorithm for binary operators so that we are able | |||
12310 | /// to handle extreme cases of chained binary operators without causing stack | |||
12311 | /// overflow. | |||
12312 | class DataRecursiveIntBinOpEvaluator { | |||
12313 | struct EvalResult { | |||
12314 | APValue Val; | |||
12315 | bool Failed; | |||
12316 | ||||
12317 | EvalResult() : Failed(false) { } | |||
12318 | ||||
12319 | void swap(EvalResult &RHS) { | |||
12320 | Val.swap(RHS.Val); | |||
12321 | Failed = RHS.Failed; | |||
12322 | RHS.Failed = false; | |||
12323 | } | |||
12324 | }; | |||
12325 | ||||
12326 | struct Job { | |||
12327 | const Expr *E; | |||
12328 | EvalResult LHSResult; // meaningful only for binary operator expression. | |||
12329 | enum { AnyExprKind, BinOpKind, BinOpVisitedLHSKind } Kind; | |||
12330 | ||||
12331 | Job() = default; | |||
12332 | Job(Job &&) = default; | |||
12333 | ||||
12334 | void startSpeculativeEval(EvalInfo &Info) { | |||
12335 | SpecEvalRAII = SpeculativeEvaluationRAII(Info); | |||
12336 | } | |||
12337 | ||||
12338 | private: | |||
12339 | SpeculativeEvaluationRAII SpecEvalRAII; | |||
12340 | }; | |||
12341 | ||||
12342 | SmallVector<Job, 16> Queue; | |||
12343 | ||||
12344 | IntExprEvaluator &IntEval; | |||
12345 | EvalInfo &Info; | |||
12346 | APValue &FinalResult; | |||
12347 | ||||
12348 | public: | |||
12349 | DataRecursiveIntBinOpEvaluator(IntExprEvaluator &IntEval, APValue &Result) | |||
12350 | : IntEval(IntEval), Info(IntEval.getEvalInfo()), FinalResult(Result) { } | |||
12351 | ||||
12352 | /// True if \param E is a binary operator that we are going to handle | |||
12353 | /// data recursively. | |||
12354 | /// We handle binary operators that are comma, logical, or that have operands | |||
12355 | /// with integral or enumeration type. | |||
12356 | static bool shouldEnqueue(const BinaryOperator *E) { | |||
12357 | return E->getOpcode() == BO_Comma || E->isLogicalOp() || | |||
12358 | (E->isPRValue() && E->getType()->isIntegralOrEnumerationType() && | |||
12359 | E->getLHS()->getType()->isIntegralOrEnumerationType() && | |||
12360 | E->getRHS()->getType()->isIntegralOrEnumerationType()); | |||
12361 | } | |||
12362 | ||||
12363 | bool Traverse(const BinaryOperator *E) { | |||
12364 | enqueue(E); | |||
12365 | EvalResult PrevResult; | |||
12366 | while (!Queue.empty()) | |||
12367 | process(PrevResult); | |||
12368 | ||||
12369 | if (PrevResult.Failed) return false; | |||
12370 | ||||
12371 | FinalResult.swap(PrevResult.Val); | |||
12372 | return true; | |||
12373 | } | |||
12374 | ||||
12375 | private: | |||
12376 | bool Success(uint64_t Value, const Expr *E, APValue &Result) { | |||
12377 | return IntEval.Success(Value, E, Result); | |||
12378 | } | |||
12379 | bool Success(const APSInt &Value, const Expr *E, APValue &Result) { | |||
12380 | return IntEval.Success(Value, E, Result); | |||
12381 | } | |||
12382 | bool Error(const Expr *E) { | |||
12383 | return IntEval.Error(E); | |||
12384 | } | |||
12385 | bool Error(const Expr *E, diag::kind D) { | |||
12386 | return IntEval.Error(E, D); | |||
12387 | } | |||
12388 | ||||
12389 | OptionalDiagnostic CCEDiag(const Expr *E, diag::kind D) { | |||
12390 | return Info.CCEDiag(E, D); | |||
12391 | } | |||
12392 | ||||
12393 | // Returns true if visiting the RHS is necessary, false otherwise. | |||
12394 | bool VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, | |||
12395 | bool &SuppressRHSDiags); | |||
12396 | ||||
12397 | bool VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, | |||
12398 | const BinaryOperator *E, APValue &Result); | |||
12399 | ||||
12400 | void EvaluateExpr(const Expr *E, EvalResult &Result) { | |||
12401 | Result.Failed = !Evaluate(Result.Val, Info, E); | |||
12402 | if (Result.Failed) | |||
12403 | Result.Val = APValue(); | |||
12404 | } | |||
12405 | ||||
12406 | void process(EvalResult &Result); | |||
12407 | ||||
12408 | void enqueue(const Expr *E) { | |||
12409 | E = E->IgnoreParens(); | |||
12410 | Queue.resize(Queue.size()+1); | |||
12411 | Queue.back().E = E; | |||
12412 | Queue.back().Kind = Job::AnyExprKind; | |||
12413 | } | |||
12414 | }; | |||
12415 | ||||
12416 | } | |||
12417 | ||||
12418 | bool DataRecursiveIntBinOpEvaluator:: | |||
12419 | VisitBinOpLHSOnly(EvalResult &LHSResult, const BinaryOperator *E, | |||
12420 | bool &SuppressRHSDiags) { | |||
12421 | if (E->getOpcode() == BO_Comma) { | |||
12422 | // Ignore LHS but note if we could not evaluate it. | |||
12423 | if (LHSResult.Failed) | |||
12424 | return Info.noteSideEffect(); | |||
12425 | return true; | |||
12426 | } | |||
12427 | ||||
12428 | if (E->isLogicalOp()) { | |||
12429 | bool LHSAsBool; | |||
12430 | if (!LHSResult.Failed && HandleConversionToBool(LHSResult.Val, LHSAsBool)) { | |||
12431 | // We were able to evaluate the LHS, see if we can get away with not | |||
12432 | // evaluating the RHS: 0 && X -> 0, 1 || X -> 1 | |||
12433 | if (LHSAsBool == (E->getOpcode() == BO_LOr)) { | |||
12434 | Success(LHSAsBool, E, LHSResult.Val); | |||
12435 | return false; // Ignore RHS | |||
12436 | } | |||
12437 | } else { | |||
12438 | LHSResult.Failed = true; | |||
12439 | ||||
12440 | // Since we weren't able to evaluate the left hand side, it | |||
12441 | // might have had side effects. | |||
12442 | if (!Info.noteSideEffect()) | |||
12443 | return false; | |||
12444 | ||||
12445 | // We can't evaluate the LHS; however, sometimes the result | |||
12446 | // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. | |||
12447 | // Don't ignore RHS and suppress diagnostics from this arm. | |||
12448 | SuppressRHSDiags = true; | |||
12449 | } | |||
12450 | ||||
12451 | return true; | |||
12452 | } | |||
12453 | ||||
12454 | assert(E->getLHS()->getType()->isIntegralOrEnumerationType() &&(static_cast <bool> (E->getLHS()->getType()->isIntegralOrEnumerationType () && E->getRHS()->getType()->isIntegralOrEnumerationType ()) ? void (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()" , "clang/lib/AST/ExprConstant.cpp", 12455, __extension__ __PRETTY_FUNCTION__ )) | |||
12455 | E->getRHS()->getType()->isIntegralOrEnumerationType())(static_cast <bool> (E->getLHS()->getType()->isIntegralOrEnumerationType () && E->getRHS()->getType()->isIntegralOrEnumerationType ()) ? void (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()" , "clang/lib/AST/ExprConstant.cpp", 12455, __extension__ __PRETTY_FUNCTION__ )); | |||
12456 | ||||
12457 | if (LHSResult.Failed && !Info.noteFailure()) | |||
12458 | return false; // Ignore RHS; | |||
12459 | ||||
12460 | return true; | |||
12461 | } | |||
12462 | ||||
12463 | static void addOrSubLValueAsInteger(APValue &LVal, const APSInt &Index, | |||
12464 | bool IsSub) { | |||
12465 | // Compute the new offset in the appropriate width, wrapping at 64 bits. | |||
12466 | // FIXME: When compiling for a 32-bit target, we should use 32-bit | |||
12467 | // offsets. | |||
12468 | assert(!LVal.hasLValuePath() && "have designator for integer lvalue")(static_cast <bool> (!LVal.hasLValuePath() && "have designator for integer lvalue" ) ? void (0) : __assert_fail ("!LVal.hasLValuePath() && \"have designator for integer lvalue\"" , "clang/lib/AST/ExprConstant.cpp", 12468, __extension__ __PRETTY_FUNCTION__ )); | |||
12469 | CharUnits &Offset = LVal.getLValueOffset(); | |||
12470 | uint64_t Offset64 = Offset.getQuantity(); | |||
12471 | uint64_t Index64 = Index.extOrTrunc(64).getZExtValue(); | |||
12472 | Offset = CharUnits::fromQuantity(IsSub ? Offset64 - Index64 | |||
12473 | : Offset64 + Index64); | |||
12474 | } | |||
12475 | ||||
12476 | bool DataRecursiveIntBinOpEvaluator:: | |||
12477 | VisitBinOp(const EvalResult &LHSResult, const EvalResult &RHSResult, | |||
12478 | const BinaryOperator *E, APValue &Result) { | |||
12479 | if (E->getOpcode() == BO_Comma) { | |||
12480 | if (RHSResult.Failed) | |||
12481 | return false; | |||
12482 | Result = RHSResult.Val; | |||
12483 | return true; | |||
12484 | } | |||
12485 | ||||
12486 | if (E->isLogicalOp()) { | |||
12487 | bool lhsResult, rhsResult; | |||
12488 | bool LHSIsOK = HandleConversionToBool(LHSResult.Val, lhsResult); | |||
12489 | bool RHSIsOK = HandleConversionToBool(RHSResult.Val, rhsResult); | |||
12490 | ||||
12491 | if (LHSIsOK) { | |||
12492 | if (RHSIsOK) { | |||
12493 | if (E->getOpcode() == BO_LOr) | |||
12494 | return Success(lhsResult || rhsResult, E, Result); | |||
12495 | else | |||
12496 | return Success(lhsResult && rhsResult, E, Result); | |||
12497 | } | |||
12498 | } else { | |||
12499 | if (RHSIsOK) { | |||
12500 | // We can't evaluate the LHS; however, sometimes the result | |||
12501 | // is determined by the RHS: X && 0 -> 0, X || 1 -> 1. | |||
12502 | if (rhsResult == (E->getOpcode() == BO_LOr)) | |||
12503 | return Success(rhsResult, E, Result); | |||
12504 | } | |||
12505 | } | |||
12506 | ||||
12507 | return false; | |||
12508 | } | |||
12509 | ||||
12510 | assert(E->getLHS()->getType()->isIntegralOrEnumerationType() &&(static_cast <bool> (E->getLHS()->getType()->isIntegralOrEnumerationType () && E->getRHS()->getType()->isIntegralOrEnumerationType ()) ? void (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()" , "clang/lib/AST/ExprConstant.cpp", 12511, __extension__ __PRETTY_FUNCTION__ )) | |||
12511 | E->getRHS()->getType()->isIntegralOrEnumerationType())(static_cast <bool> (E->getLHS()->getType()->isIntegralOrEnumerationType () && E->getRHS()->getType()->isIntegralOrEnumerationType ()) ? void (0) : __assert_fail ("E->getLHS()->getType()->isIntegralOrEnumerationType() && E->getRHS()->getType()->isIntegralOrEnumerationType()" , "clang/lib/AST/ExprConstant.cpp", 12511, __extension__ __PRETTY_FUNCTION__ )); | |||
12512 | ||||
12513 | if (LHSResult.Failed || RHSResult.Failed) | |||
12514 | return false; | |||
12515 | ||||
12516 | const APValue &LHSVal = LHSResult.Val; | |||
12517 | const APValue &RHSVal = RHSResult.Val; | |||
12518 | ||||
12519 | // Handle cases like (unsigned long)&a + 4. | |||
12520 | if (E->isAdditiveOp() && LHSVal.isLValue() && RHSVal.isInt()) { | |||
12521 | Result = LHSVal; | |||
12522 | addOrSubLValueAsInteger(Result, RHSVal.getInt(), E->getOpcode() == BO_Sub); | |||
12523 | return true; | |||
12524 | } | |||
12525 | ||||
12526 | // Handle cases like 4 + (unsigned long)&a | |||
12527 | if (E->getOpcode() == BO_Add && | |||
12528 | RHSVal.isLValue() && LHSVal.isInt()) { | |||
12529 | Result = RHSVal; | |||
12530 | addOrSubLValueAsInteger(Result, LHSVal.getInt(), /*IsSub*/false); | |||
12531 | return true; | |||
12532 | } | |||
12533 | ||||
12534 | if (E->getOpcode() == BO_Sub && LHSVal.isLValue() && RHSVal.isLValue()) { | |||
12535 | // Handle (intptr_t)&&A - (intptr_t)&&B. | |||
12536 | if (!LHSVal.getLValueOffset().isZero() || | |||
12537 | !RHSVal.getLValueOffset().isZero()) | |||
12538 | return false; | |||
12539 | const Expr *LHSExpr = LHSVal.getLValueBase().dyn_cast<const Expr*>(); | |||
12540 | const Expr *RHSExpr = RHSVal.getLValueBase().dyn_cast<const Expr*>(); | |||
12541 | if (!LHSExpr || !RHSExpr) | |||
12542 | return false; | |||
12543 | const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); | |||
12544 | const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); | |||
12545 | if (!LHSAddrExpr || !RHSAddrExpr) | |||
12546 | return false; | |||
12547 | // Make sure both labels come from the same function. | |||
12548 | if (LHSAddrExpr->getLabel()->getDeclContext() != | |||
12549 | RHSAddrExpr->getLabel()->getDeclContext()) | |||
12550 | return false; | |||
12551 | Result = APValue(LHSAddrExpr, RHSAddrExpr); | |||
12552 | return true; | |||
12553 | } | |||
12554 | ||||
12555 | // All the remaining cases expect both operands to be an integer | |||
12556 | if (!LHSVal.isInt() || !RHSVal.isInt()) | |||
12557 | return Error(E); | |||
12558 | ||||
12559 | // Set up the width and signedness manually, in case it can't be deduced | |||
12560 | // from the operation we're performing. | |||
12561 | // FIXME: Don't do this in the cases where we can deduce it. | |||
12562 | APSInt Value(Info.Ctx.getIntWidth(E->getType()), | |||
12563 | E->getType()->isUnsignedIntegerOrEnumerationType()); | |||
12564 | if (!handleIntIntBinOp(Info, E, LHSVal.getInt(), E->getOpcode(), | |||
12565 | RHSVal.getInt(), Value)) | |||
12566 | return false; | |||
12567 | return Success(Value, E, Result); | |||
12568 | } | |||
12569 | ||||
12570 | void DataRecursiveIntBinOpEvaluator::process(EvalResult &Result) { | |||
12571 | Job &job = Queue.back(); | |||
12572 | ||||
12573 | switch (job.Kind) { | |||
12574 | case Job::AnyExprKind: { | |||
12575 | if (const BinaryOperator *Bop = dyn_cast<BinaryOperator>(job.E)) { | |||
12576 | if (shouldEnqueue(Bop)) { | |||
12577 | job.Kind = Job::BinOpKind; | |||
12578 | enqueue(Bop->getLHS()); | |||
12579 | return; | |||
12580 | } | |||
12581 | } | |||
12582 | ||||
12583 | EvaluateExpr(job.E, Result); | |||
12584 | Queue.pop_back(); | |||
12585 | return; | |||
12586 | } | |||
12587 | ||||
12588 | case Job::BinOpKind: { | |||
12589 | const BinaryOperator *Bop = cast<BinaryOperator>(job.E); | |||
12590 | bool SuppressRHSDiags = false; | |||
12591 | if (!VisitBinOpLHSOnly(Result, Bop, SuppressRHSDiags)) { | |||
12592 | Queue.pop_back(); | |||
12593 | return; | |||
12594 | } | |||
12595 | if (SuppressRHSDiags) | |||
12596 | job.startSpeculativeEval(Info); | |||
12597 | job.LHSResult.swap(Result); | |||
12598 | job.Kind = Job::BinOpVisitedLHSKind; | |||
12599 | enqueue(Bop->getRHS()); | |||
12600 | return; | |||
12601 | } | |||
12602 | ||||
12603 | case Job::BinOpVisitedLHSKind: { | |||
12604 | const BinaryOperator *Bop = cast<BinaryOperator>(job.E); | |||
12605 | EvalResult RHS; | |||
12606 | RHS.swap(Result); | |||
12607 | Result.Failed = !VisitBinOp(job.LHSResult, RHS, Bop, Result.Val); | |||
12608 | Queue.pop_back(); | |||
12609 | return; | |||
12610 | } | |||
12611 | } | |||
12612 | ||||
12613 | llvm_unreachable("Invalid Job::Kind!")::llvm::llvm_unreachable_internal("Invalid Job::Kind!", "clang/lib/AST/ExprConstant.cpp" , 12613); | |||
12614 | } | |||
12615 | ||||
12616 | namespace { | |||
12617 | enum class CmpResult { | |||
12618 | Unequal, | |||
12619 | Less, | |||
12620 | Equal, | |||
12621 | Greater, | |||
12622 | Unordered, | |||
12623 | }; | |||
12624 | } | |||
12625 | ||||
12626 | template <class SuccessCB, class AfterCB> | |||
12627 | static bool | |||
12628 | EvaluateComparisonBinaryOperator(EvalInfo &Info, const BinaryOperator *E, | |||
12629 | SuccessCB &&Success, AfterCB &&DoAfter) { | |||
12630 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 12630, __extension__ __PRETTY_FUNCTION__)); | |||
12631 | assert(E->isComparisonOp() && "expected comparison operator")(static_cast <bool> (E->isComparisonOp() && "expected comparison operator" ) ? void (0) : __assert_fail ("E->isComparisonOp() && \"expected comparison operator\"" , "clang/lib/AST/ExprConstant.cpp", 12631, __extension__ __PRETTY_FUNCTION__ )); | |||
12632 | assert((E->getOpcode() == BO_Cmp ||(static_cast <bool> ((E->getOpcode() == BO_Cmp || E-> getType()->isIntegralOrEnumerationType()) && "unsupported binary expression evaluation" ) ? void (0) : __assert_fail ("(E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType()) && \"unsupported binary expression evaluation\"" , "clang/lib/AST/ExprConstant.cpp", 12634, __extension__ __PRETTY_FUNCTION__ )) | |||
12633 | E->getType()->isIntegralOrEnumerationType()) &&(static_cast <bool> ((E->getOpcode() == BO_Cmp || E-> getType()->isIntegralOrEnumerationType()) && "unsupported binary expression evaluation" ) ? void (0) : __assert_fail ("(E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType()) && \"unsupported binary expression evaluation\"" , "clang/lib/AST/ExprConstant.cpp", 12634, __extension__ __PRETTY_FUNCTION__ )) | |||
12634 | "unsupported binary expression evaluation")(static_cast <bool> ((E->getOpcode() == BO_Cmp || E-> getType()->isIntegralOrEnumerationType()) && "unsupported binary expression evaluation" ) ? void (0) : __assert_fail ("(E->getOpcode() == BO_Cmp || E->getType()->isIntegralOrEnumerationType()) && \"unsupported binary expression evaluation\"" , "clang/lib/AST/ExprConstant.cpp", 12634, __extension__ __PRETTY_FUNCTION__ )); | |||
12635 | auto Error = [&](const Expr *E) { | |||
12636 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
12637 | return false; | |||
12638 | }; | |||
12639 | ||||
12640 | bool IsRelational = E->isRelationalOp() || E->getOpcode() == BO_Cmp; | |||
12641 | bool IsEquality = E->isEqualityOp(); | |||
12642 | ||||
12643 | QualType LHSTy = E->getLHS()->getType(); | |||
12644 | QualType RHSTy = E->getRHS()->getType(); | |||
12645 | ||||
12646 | if (LHSTy->isIntegralOrEnumerationType() && | |||
12647 | RHSTy->isIntegralOrEnumerationType()) { | |||
12648 | APSInt LHS, RHS; | |||
12649 | bool LHSOK = EvaluateInteger(E->getLHS(), LHS, Info); | |||
12650 | if (!LHSOK && !Info.noteFailure()) | |||
12651 | return false; | |||
12652 | if (!EvaluateInteger(E->getRHS(), RHS, Info) || !LHSOK) | |||
12653 | return false; | |||
12654 | if (LHS < RHS) | |||
12655 | return Success(CmpResult::Less, E); | |||
12656 | if (LHS > RHS) | |||
12657 | return Success(CmpResult::Greater, E); | |||
12658 | return Success(CmpResult::Equal, E); | |||
12659 | } | |||
12660 | ||||
12661 | if (LHSTy->isFixedPointType() || RHSTy->isFixedPointType()) { | |||
12662 | APFixedPoint LHSFX(Info.Ctx.getFixedPointSemantics(LHSTy)); | |||
12663 | APFixedPoint RHSFX(Info.Ctx.getFixedPointSemantics(RHSTy)); | |||
12664 | ||||
12665 | bool LHSOK = EvaluateFixedPointOrInteger(E->getLHS(), LHSFX, Info); | |||
12666 | if (!LHSOK && !Info.noteFailure()) | |||
12667 | return false; | |||
12668 | if (!EvaluateFixedPointOrInteger(E->getRHS(), RHSFX, Info) || !LHSOK) | |||
12669 | return false; | |||
12670 | if (LHSFX < RHSFX) | |||
12671 | return Success(CmpResult::Less, E); | |||
12672 | if (LHSFX > RHSFX) | |||
12673 | return Success(CmpResult::Greater, E); | |||
12674 | return Success(CmpResult::Equal, E); | |||
12675 | } | |||
12676 | ||||
12677 | if (LHSTy->isAnyComplexType() || RHSTy->isAnyComplexType()) { | |||
12678 | ComplexValue LHS, RHS; | |||
12679 | bool LHSOK; | |||
12680 | if (E->isAssignmentOp()) { | |||
12681 | LValue LV; | |||
12682 | EvaluateLValue(E->getLHS(), LV, Info); | |||
12683 | LHSOK = false; | |||
12684 | } else if (LHSTy->isRealFloatingType()) { | |||
12685 | LHSOK = EvaluateFloat(E->getLHS(), LHS.FloatReal, Info); | |||
12686 | if (LHSOK) { | |||
12687 | LHS.makeComplexFloat(); | |||
12688 | LHS.FloatImag = APFloat(LHS.FloatReal.getSemantics()); | |||
12689 | } | |||
12690 | } else { | |||
12691 | LHSOK = EvaluateComplex(E->getLHS(), LHS, Info); | |||
12692 | } | |||
12693 | if (!LHSOK && !Info.noteFailure()) | |||
12694 | return false; | |||
12695 | ||||
12696 | if (E->getRHS()->getType()->isRealFloatingType()) { | |||
12697 | if (!EvaluateFloat(E->getRHS(), RHS.FloatReal, Info) || !LHSOK) | |||
12698 | return false; | |||
12699 | RHS.makeComplexFloat(); | |||
12700 | RHS.FloatImag = APFloat(RHS.FloatReal.getSemantics()); | |||
12701 | } else if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) | |||
12702 | return false; | |||
12703 | ||||
12704 | if (LHS.isComplexFloat()) { | |||
12705 | APFloat::cmpResult CR_r = | |||
12706 | LHS.getComplexFloatReal().compare(RHS.getComplexFloatReal()); | |||
12707 | APFloat::cmpResult CR_i = | |||
12708 | LHS.getComplexFloatImag().compare(RHS.getComplexFloatImag()); | |||
12709 | bool IsEqual = CR_r == APFloat::cmpEqual && CR_i == APFloat::cmpEqual; | |||
12710 | return Success(IsEqual ? CmpResult::Equal : CmpResult::Unequal, E); | |||
12711 | } else { | |||
12712 | assert(IsEquality && "invalid complex comparison")(static_cast <bool> (IsEquality && "invalid complex comparison" ) ? void (0) : __assert_fail ("IsEquality && \"invalid complex comparison\"" , "clang/lib/AST/ExprConstant.cpp", 12712, __extension__ __PRETTY_FUNCTION__ )); | |||
12713 | bool IsEqual = LHS.getComplexIntReal() == RHS.getComplexIntReal() && | |||
12714 | LHS.getComplexIntImag() == RHS.getComplexIntImag(); | |||
12715 | return Success(IsEqual ? CmpResult::Equal : CmpResult::Unequal, E); | |||
12716 | } | |||
12717 | } | |||
12718 | ||||
12719 | if (LHSTy->isRealFloatingType() && | |||
12720 | RHSTy->isRealFloatingType()) { | |||
12721 | APFloat RHS(0.0), LHS(0.0); | |||
12722 | ||||
12723 | bool LHSOK = EvaluateFloat(E->getRHS(), RHS, Info); | |||
12724 | if (!LHSOK && !Info.noteFailure()) | |||
12725 | return false; | |||
12726 | ||||
12727 | if (!EvaluateFloat(E->getLHS(), LHS, Info) || !LHSOK) | |||
12728 | return false; | |||
12729 | ||||
12730 | assert(E->isComparisonOp() && "Invalid binary operator!")(static_cast <bool> (E->isComparisonOp() && "Invalid binary operator!" ) ? void (0) : __assert_fail ("E->isComparisonOp() && \"Invalid binary operator!\"" , "clang/lib/AST/ExprConstant.cpp", 12730, __extension__ __PRETTY_FUNCTION__ )); | |||
12731 | llvm::APFloatBase::cmpResult APFloatCmpResult = LHS.compare(RHS); | |||
12732 | if (!Info.InConstantContext && | |||
12733 | APFloatCmpResult == APFloat::cmpUnordered && | |||
12734 | E->getFPFeaturesInEffect(Info.Ctx.getLangOpts()).isFPConstrained()) { | |||
12735 | // Note: Compares may raise invalid in some cases involving NaN or sNaN. | |||
12736 | Info.FFDiag(E, diag::note_constexpr_float_arithmetic_strict); | |||
12737 | return false; | |||
12738 | } | |||
12739 | auto GetCmpRes = [&]() { | |||
12740 | switch (APFloatCmpResult) { | |||
12741 | case APFloat::cmpEqual: | |||
12742 | return CmpResult::Equal; | |||
12743 | case APFloat::cmpLessThan: | |||
12744 | return CmpResult::Less; | |||
12745 | case APFloat::cmpGreaterThan: | |||
12746 | return CmpResult::Greater; | |||
12747 | case APFloat::cmpUnordered: | |||
12748 | return CmpResult::Unordered; | |||
12749 | } | |||
12750 | llvm_unreachable("Unrecognised APFloat::cmpResult enum")::llvm::llvm_unreachable_internal("Unrecognised APFloat::cmpResult enum" , "clang/lib/AST/ExprConstant.cpp", 12750); | |||
12751 | }; | |||
12752 | return Success(GetCmpRes(), E); | |||
12753 | } | |||
12754 | ||||
12755 | if (LHSTy->isPointerType() && RHSTy->isPointerType()) { | |||
12756 | LValue LHSValue, RHSValue; | |||
12757 | ||||
12758 | bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); | |||
12759 | if (!LHSOK && !Info.noteFailure()) | |||
12760 | return false; | |||
12761 | ||||
12762 | if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) | |||
12763 | return false; | |||
12764 | ||||
12765 | // Reject differing bases from the normal codepath; we special-case | |||
12766 | // comparisons to null. | |||
12767 | if (!HasSameBase(LHSValue, RHSValue)) { | |||
12768 | // Inequalities and subtractions between unrelated pointers have | |||
12769 | // unspecified or undefined behavior. | |||
12770 | if (!IsEquality) { | |||
12771 | Info.FFDiag(E, diag::note_constexpr_pointer_comparison_unspecified); | |||
12772 | return false; | |||
12773 | } | |||
12774 | // A constant address may compare equal to the address of a symbol. | |||
12775 | // The one exception is that address of an object cannot compare equal | |||
12776 | // to a null pointer constant. | |||
12777 | if ((!LHSValue.Base && !LHSValue.Offset.isZero()) || | |||
12778 | (!RHSValue.Base && !RHSValue.Offset.isZero())) | |||
12779 | return Error(E); | |||
12780 | // It's implementation-defined whether distinct literals will have | |||
12781 | // distinct addresses. In clang, the result of such a comparison is | |||
12782 | // unspecified, so it is not a constant expression. However, we do know | |||
12783 | // that the address of a literal will be non-null. | |||
12784 | if ((IsLiteralLValue(LHSValue) || IsLiteralLValue(RHSValue)) && | |||
12785 | LHSValue.Base && RHSValue.Base) | |||
12786 | return Error(E); | |||
12787 | // We can't tell whether weak symbols will end up pointing to the same | |||
12788 | // object. | |||
12789 | if (IsWeakLValue(LHSValue) || IsWeakLValue(RHSValue)) | |||
12790 | return Error(E); | |||
12791 | // We can't compare the address of the start of one object with the | |||
12792 | // past-the-end address of another object, per C++ DR1652. | |||
12793 | if ((LHSValue.Base && LHSValue.Offset.isZero() && | |||
12794 | isOnePastTheEndOfCompleteObject(Info.Ctx, RHSValue)) || | |||
12795 | (RHSValue.Base && RHSValue.Offset.isZero() && | |||
12796 | isOnePastTheEndOfCompleteObject(Info.Ctx, LHSValue))) | |||
12797 | return Error(E); | |||
12798 | // We can't tell whether an object is at the same address as another | |||
12799 | // zero sized object. | |||
12800 | if ((RHSValue.Base && isZeroSized(LHSValue)) || | |||
12801 | (LHSValue.Base && isZeroSized(RHSValue))) | |||
12802 | return Error(E); | |||
12803 | return Success(CmpResult::Unequal, E); | |||
12804 | } | |||
12805 | ||||
12806 | const CharUnits &LHSOffset = LHSValue.getLValueOffset(); | |||
12807 | const CharUnits &RHSOffset = RHSValue.getLValueOffset(); | |||
12808 | ||||
12809 | SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); | |||
12810 | SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); | |||
12811 | ||||
12812 | // C++11 [expr.rel]p3: | |||
12813 | // Pointers to void (after pointer conversions) can be compared, with a | |||
12814 | // result defined as follows: If both pointers represent the same | |||
12815 | // address or are both the null pointer value, the result is true if the | |||
12816 | // operator is <= or >= and false otherwise; otherwise the result is | |||
12817 | // unspecified. | |||
12818 | // We interpret this as applying to pointers to *cv* void. | |||
12819 | if (LHSTy->isVoidPointerType() && LHSOffset != RHSOffset && IsRelational) | |||
12820 | Info.CCEDiag(E, diag::note_constexpr_void_comparison); | |||
12821 | ||||
12822 | // C++11 [expr.rel]p2: | |||
12823 | // - If two pointers point to non-static data members of the same object, | |||
12824 | // or to subobjects or array elements fo such members, recursively, the | |||
12825 | // pointer to the later declared member compares greater provided the | |||
12826 | // two members have the same access control and provided their class is | |||
12827 | // not a union. | |||
12828 | // [...] | |||
12829 | // - Otherwise pointer comparisons are unspecified. | |||
12830 | if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && IsRelational) { | |||
12831 | bool WasArrayIndex; | |||
12832 | unsigned Mismatch = FindDesignatorMismatch( | |||
12833 | getType(LHSValue.Base), LHSDesignator, RHSDesignator, WasArrayIndex); | |||
12834 | // At the point where the designators diverge, the comparison has a | |||
12835 | // specified value if: | |||
12836 | // - we are comparing array indices | |||
12837 | // - we are comparing fields of a union, or fields with the same access | |||
12838 | // Otherwise, the result is unspecified and thus the comparison is not a | |||
12839 | // constant expression. | |||
12840 | if (!WasArrayIndex && Mismatch < LHSDesignator.Entries.size() && | |||
12841 | Mismatch < RHSDesignator.Entries.size()) { | |||
12842 | const FieldDecl *LF = getAsField(LHSDesignator.Entries[Mismatch]); | |||
12843 | const FieldDecl *RF = getAsField(RHSDesignator.Entries[Mismatch]); | |||
12844 | if (!LF && !RF) | |||
12845 | Info.CCEDiag(E, diag::note_constexpr_pointer_comparison_base_classes); | |||
12846 | else if (!LF) | |||
12847 | Info.CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) | |||
12848 | << getAsBaseClass(LHSDesignator.Entries[Mismatch]) | |||
12849 | << RF->getParent() << RF; | |||
12850 | else if (!RF) | |||
12851 | Info.CCEDiag(E, diag::note_constexpr_pointer_comparison_base_field) | |||
12852 | << getAsBaseClass(RHSDesignator.Entries[Mismatch]) | |||
12853 | << LF->getParent() << LF; | |||
12854 | else if (!LF->getParent()->isUnion() && | |||
12855 | LF->getAccess() != RF->getAccess()) | |||
12856 | Info.CCEDiag(E, | |||
12857 | diag::note_constexpr_pointer_comparison_differing_access) | |||
12858 | << LF << LF->getAccess() << RF << RF->getAccess() | |||
12859 | << LF->getParent(); | |||
12860 | } | |||
12861 | } | |||
12862 | ||||
12863 | // The comparison here must be unsigned, and performed with the same | |||
12864 | // width as the pointer. | |||
12865 | unsigned PtrSize = Info.Ctx.getTypeSize(LHSTy); | |||
12866 | uint64_t CompareLHS = LHSOffset.getQuantity(); | |||
12867 | uint64_t CompareRHS = RHSOffset.getQuantity(); | |||
12868 | assert(PtrSize <= 64 && "Unexpected pointer width")(static_cast <bool> (PtrSize <= 64 && "Unexpected pointer width" ) ? void (0) : __assert_fail ("PtrSize <= 64 && \"Unexpected pointer width\"" , "clang/lib/AST/ExprConstant.cpp", 12868, __extension__ __PRETTY_FUNCTION__ )); | |||
12869 | uint64_t Mask = ~0ULL >> (64 - PtrSize); | |||
12870 | CompareLHS &= Mask; | |||
12871 | CompareRHS &= Mask; | |||
12872 | ||||
12873 | // If there is a base and this is a relational operator, we can only | |||
12874 | // compare pointers within the object in question; otherwise, the result | |||
12875 | // depends on where the object is located in memory. | |||
12876 | if (!LHSValue.Base.isNull() && IsRelational) { | |||
12877 | QualType BaseTy = getType(LHSValue.Base); | |||
12878 | if (BaseTy->isIncompleteType()) | |||
12879 | return Error(E); | |||
12880 | CharUnits Size = Info.Ctx.getTypeSizeInChars(BaseTy); | |||
12881 | uint64_t OffsetLimit = Size.getQuantity(); | |||
12882 | if (CompareLHS > OffsetLimit || CompareRHS > OffsetLimit) | |||
12883 | return Error(E); | |||
12884 | } | |||
12885 | ||||
12886 | if (CompareLHS < CompareRHS) | |||
12887 | return Success(CmpResult::Less, E); | |||
12888 | if (CompareLHS > CompareRHS) | |||
12889 | return Success(CmpResult::Greater, E); | |||
12890 | return Success(CmpResult::Equal, E); | |||
12891 | } | |||
12892 | ||||
12893 | if (LHSTy->isMemberPointerType()) { | |||
12894 | assert(IsEquality && "unexpected member pointer operation")(static_cast <bool> (IsEquality && "unexpected member pointer operation" ) ? void (0) : __assert_fail ("IsEquality && \"unexpected member pointer operation\"" , "clang/lib/AST/ExprConstant.cpp", 12894, __extension__ __PRETTY_FUNCTION__ )); | |||
12895 | assert(RHSTy->isMemberPointerType() && "invalid comparison")(static_cast <bool> (RHSTy->isMemberPointerType() && "invalid comparison") ? void (0) : __assert_fail ("RHSTy->isMemberPointerType() && \"invalid comparison\"" , "clang/lib/AST/ExprConstant.cpp", 12895, __extension__ __PRETTY_FUNCTION__ )); | |||
12896 | ||||
12897 | MemberPtr LHSValue, RHSValue; | |||
12898 | ||||
12899 | bool LHSOK = EvaluateMemberPointer(E->getLHS(), LHSValue, Info); | |||
12900 | if (!LHSOK && !Info.noteFailure()) | |||
12901 | return false; | |||
12902 | ||||
12903 | if (!EvaluateMemberPointer(E->getRHS(), RHSValue, Info) || !LHSOK) | |||
12904 | return false; | |||
12905 | ||||
12906 | // C++11 [expr.eq]p2: | |||
12907 | // If both operands are null, they compare equal. Otherwise if only one is | |||
12908 | // null, they compare unequal. | |||
12909 | if (!LHSValue.getDecl() || !RHSValue.getDecl()) { | |||
12910 | bool Equal = !LHSValue.getDecl() && !RHSValue.getDecl(); | |||
12911 | return Success(Equal ? CmpResult::Equal : CmpResult::Unequal, E); | |||
12912 | } | |||
12913 | ||||
12914 | // Otherwise if either is a pointer to a virtual member function, the | |||
12915 | // result is unspecified. | |||
12916 | if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(LHSValue.getDecl())) | |||
12917 | if (MD->isVirtual()) | |||
12918 | Info.CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; | |||
12919 | if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(RHSValue.getDecl())) | |||
12920 | if (MD->isVirtual()) | |||
12921 | Info.CCEDiag(E, diag::note_constexpr_compare_virtual_mem_ptr) << MD; | |||
12922 | ||||
12923 | // Otherwise they compare equal if and only if they would refer to the | |||
12924 | // same member of the same most derived object or the same subobject if | |||
12925 | // they were dereferenced with a hypothetical object of the associated | |||
12926 | // class type. | |||
12927 | bool Equal = LHSValue == RHSValue; | |||
12928 | return Success(Equal ? CmpResult::Equal : CmpResult::Unequal, E); | |||
12929 | } | |||
12930 | ||||
12931 | if (LHSTy->isNullPtrType()) { | |||
12932 | assert(E->isComparisonOp() && "unexpected nullptr operation")(static_cast <bool> (E->isComparisonOp() && "unexpected nullptr operation" ) ? void (0) : __assert_fail ("E->isComparisonOp() && \"unexpected nullptr operation\"" , "clang/lib/AST/ExprConstant.cpp", 12932, __extension__ __PRETTY_FUNCTION__ )); | |||
12933 | assert(RHSTy->isNullPtrType() && "missing pointer conversion")(static_cast <bool> (RHSTy->isNullPtrType() && "missing pointer conversion") ? void (0) : __assert_fail ("RHSTy->isNullPtrType() && \"missing pointer conversion\"" , "clang/lib/AST/ExprConstant.cpp", 12933, __extension__ __PRETTY_FUNCTION__ )); | |||
12934 | // C++11 [expr.rel]p4, [expr.eq]p3: If two operands of type std::nullptr_t | |||
12935 | // are compared, the result is true of the operator is <=, >= or ==, and | |||
12936 | // false otherwise. | |||
12937 | return Success(CmpResult::Equal, E); | |||
12938 | } | |||
12939 | ||||
12940 | return DoAfter(); | |||
12941 | } | |||
12942 | ||||
12943 | bool RecordExprEvaluator::VisitBinCmp(const BinaryOperator *E) { | |||
12944 | if (!CheckLiteralType(Info, E)) | |||
12945 | return false; | |||
12946 | ||||
12947 | auto OnSuccess = [&](CmpResult CR, const BinaryOperator *E) { | |||
12948 | ComparisonCategoryResult CCR; | |||
12949 | switch (CR) { | |||
12950 | case CmpResult::Unequal: | |||
12951 | llvm_unreachable("should never produce Unequal for three-way comparison")::llvm::llvm_unreachable_internal("should never produce Unequal for three-way comparison" , "clang/lib/AST/ExprConstant.cpp", 12951); | |||
12952 | case CmpResult::Less: | |||
12953 | CCR = ComparisonCategoryResult::Less; | |||
12954 | break; | |||
12955 | case CmpResult::Equal: | |||
12956 | CCR = ComparisonCategoryResult::Equal; | |||
12957 | break; | |||
12958 | case CmpResult::Greater: | |||
12959 | CCR = ComparisonCategoryResult::Greater; | |||
12960 | break; | |||
12961 | case CmpResult::Unordered: | |||
12962 | CCR = ComparisonCategoryResult::Unordered; | |||
12963 | break; | |||
12964 | } | |||
12965 | // Evaluation succeeded. Lookup the information for the comparison category | |||
12966 | // type and fetch the VarDecl for the result. | |||
12967 | const ComparisonCategoryInfo &CmpInfo = | |||
12968 | Info.Ctx.CompCategories.getInfoForType(E->getType()); | |||
12969 | const VarDecl *VD = CmpInfo.getValueInfo(CmpInfo.makeWeakResult(CCR))->VD; | |||
12970 | // Check and evaluate the result as a constant expression. | |||
12971 | LValue LV; | |||
12972 | LV.set(VD); | |||
12973 | if (!handleLValueToRValueConversion(Info, E, E->getType(), LV, Result)) | |||
12974 | return false; | |||
12975 | return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result, | |||
12976 | ConstantExprKind::Normal); | |||
12977 | }; | |||
12978 | return EvaluateComparisonBinaryOperator(Info, E, OnSuccess, [&]() { | |||
12979 | return ExprEvaluatorBaseTy::VisitBinCmp(E); | |||
12980 | }); | |||
12981 | } | |||
12982 | ||||
12983 | bool IntExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | |||
12984 | // We don't support assignment in C. C++ assignments don't get here because | |||
12985 | // assignment is an lvalue in C++. | |||
12986 | if (E->isAssignmentOp()) { | |||
12987 | Error(E); | |||
12988 | if (!Info.noteFailure()) | |||
12989 | return false; | |||
12990 | } | |||
12991 | ||||
12992 | if (DataRecursiveIntBinOpEvaluator::shouldEnqueue(E)) | |||
12993 | return DataRecursiveIntBinOpEvaluator(*this, Result).Traverse(E); | |||
12994 | ||||
12995 | assert((!E->getLHS()->getType()->isIntegralOrEnumerationType() ||(static_cast <bool> ((!E->getLHS()->getType()-> isIntegralOrEnumerationType() || !E->getRHS()->getType( )->isIntegralOrEnumerationType()) && "DataRecursiveIntBinOpEvaluator should have handled integral types" ) ? void (0) : __assert_fail ("(!E->getLHS()->getType()->isIntegralOrEnumerationType() || !E->getRHS()->getType()->isIntegralOrEnumerationType()) && \"DataRecursiveIntBinOpEvaluator should have handled integral types\"" , "clang/lib/AST/ExprConstant.cpp", 12997, __extension__ __PRETTY_FUNCTION__ )) | |||
12996 | !E->getRHS()->getType()->isIntegralOrEnumerationType()) &&(static_cast <bool> ((!E->getLHS()->getType()-> isIntegralOrEnumerationType() || !E->getRHS()->getType( )->isIntegralOrEnumerationType()) && "DataRecursiveIntBinOpEvaluator should have handled integral types" ) ? void (0) : __assert_fail ("(!E->getLHS()->getType()->isIntegralOrEnumerationType() || !E->getRHS()->getType()->isIntegralOrEnumerationType()) && \"DataRecursiveIntBinOpEvaluator should have handled integral types\"" , "clang/lib/AST/ExprConstant.cpp", 12997, __extension__ __PRETTY_FUNCTION__ )) | |||
12997 | "DataRecursiveIntBinOpEvaluator should have handled integral types")(static_cast <bool> ((!E->getLHS()->getType()-> isIntegralOrEnumerationType() || !E->getRHS()->getType( )->isIntegralOrEnumerationType()) && "DataRecursiveIntBinOpEvaluator should have handled integral types" ) ? void (0) : __assert_fail ("(!E->getLHS()->getType()->isIntegralOrEnumerationType() || !E->getRHS()->getType()->isIntegralOrEnumerationType()) && \"DataRecursiveIntBinOpEvaluator should have handled integral types\"" , "clang/lib/AST/ExprConstant.cpp", 12997, __extension__ __PRETTY_FUNCTION__ )); | |||
12998 | ||||
12999 | if (E->isComparisonOp()) { | |||
13000 | // Evaluate builtin binary comparisons by evaluating them as three-way | |||
13001 | // comparisons and then translating the result. | |||
13002 | auto OnSuccess = [&](CmpResult CR, const BinaryOperator *E) { | |||
13003 | assert((CR != CmpResult::Unequal || E->isEqualityOp()) &&(static_cast <bool> ((CR != CmpResult::Unequal || E-> isEqualityOp()) && "should only produce Unequal for equality comparisons" ) ? void (0) : __assert_fail ("(CR != CmpResult::Unequal || E->isEqualityOp()) && \"should only produce Unequal for equality comparisons\"" , "clang/lib/AST/ExprConstant.cpp", 13004, __extension__ __PRETTY_FUNCTION__ )) | |||
13004 | "should only produce Unequal for equality comparisons")(static_cast <bool> ((CR != CmpResult::Unequal || E-> isEqualityOp()) && "should only produce Unequal for equality comparisons" ) ? void (0) : __assert_fail ("(CR != CmpResult::Unequal || E->isEqualityOp()) && \"should only produce Unequal for equality comparisons\"" , "clang/lib/AST/ExprConstant.cpp", 13004, __extension__ __PRETTY_FUNCTION__ )); | |||
13005 | bool IsEqual = CR == CmpResult::Equal, | |||
13006 | IsLess = CR == CmpResult::Less, | |||
13007 | IsGreater = CR == CmpResult::Greater; | |||
13008 | auto Op = E->getOpcode(); | |||
13009 | switch (Op) { | |||
13010 | default: | |||
13011 | llvm_unreachable("unsupported binary operator")::llvm::llvm_unreachable_internal("unsupported binary operator" , "clang/lib/AST/ExprConstant.cpp", 13011); | |||
13012 | case BO_EQ: | |||
13013 | case BO_NE: | |||
13014 | return Success(IsEqual == (Op == BO_EQ), E); | |||
13015 | case BO_LT: | |||
13016 | return Success(IsLess, E); | |||
13017 | case BO_GT: | |||
13018 | return Success(IsGreater, E); | |||
13019 | case BO_LE: | |||
13020 | return Success(IsEqual || IsLess, E); | |||
13021 | case BO_GE: | |||
13022 | return Success(IsEqual || IsGreater, E); | |||
13023 | } | |||
13024 | }; | |||
13025 | return EvaluateComparisonBinaryOperator(Info, E, OnSuccess, [&]() { | |||
13026 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | |||
13027 | }); | |||
13028 | } | |||
13029 | ||||
13030 | QualType LHSTy = E->getLHS()->getType(); | |||
13031 | QualType RHSTy = E->getRHS()->getType(); | |||
13032 | ||||
13033 | if (LHSTy->isPointerType() && RHSTy->isPointerType() && | |||
13034 | E->getOpcode() == BO_Sub) { | |||
13035 | LValue LHSValue, RHSValue; | |||
13036 | ||||
13037 | bool LHSOK = EvaluatePointer(E->getLHS(), LHSValue, Info); | |||
13038 | if (!LHSOK && !Info.noteFailure()) | |||
13039 | return false; | |||
13040 | ||||
13041 | if (!EvaluatePointer(E->getRHS(), RHSValue, Info) || !LHSOK) | |||
13042 | return false; | |||
13043 | ||||
13044 | // Reject differing bases from the normal codepath; we special-case | |||
13045 | // comparisons to null. | |||
13046 | if (!HasSameBase(LHSValue, RHSValue)) { | |||
13047 | // Handle &&A - &&B. | |||
13048 | if (!LHSValue.Offset.isZero() || !RHSValue.Offset.isZero()) | |||
13049 | return Error(E); | |||
13050 | const Expr *LHSExpr = LHSValue.Base.dyn_cast<const Expr *>(); | |||
13051 | const Expr *RHSExpr = RHSValue.Base.dyn_cast<const Expr *>(); | |||
13052 | if (!LHSExpr || !RHSExpr) | |||
13053 | return Error(E); | |||
13054 | const AddrLabelExpr *LHSAddrExpr = dyn_cast<AddrLabelExpr>(LHSExpr); | |||
13055 | const AddrLabelExpr *RHSAddrExpr = dyn_cast<AddrLabelExpr>(RHSExpr); | |||
13056 | if (!LHSAddrExpr || !RHSAddrExpr) | |||
13057 | return Error(E); | |||
13058 | // Make sure both labels come from the same function. | |||
13059 | if (LHSAddrExpr->getLabel()->getDeclContext() != | |||
13060 | RHSAddrExpr->getLabel()->getDeclContext()) | |||
13061 | return Error(E); | |||
13062 | return Success(APValue(LHSAddrExpr, RHSAddrExpr), E); | |||
13063 | } | |||
13064 | const CharUnits &LHSOffset = LHSValue.getLValueOffset(); | |||
13065 | const CharUnits &RHSOffset = RHSValue.getLValueOffset(); | |||
13066 | ||||
13067 | SubobjectDesignator &LHSDesignator = LHSValue.getLValueDesignator(); | |||
13068 | SubobjectDesignator &RHSDesignator = RHSValue.getLValueDesignator(); | |||
13069 | ||||
13070 | // C++11 [expr.add]p6: | |||
13071 | // Unless both pointers point to elements of the same array object, or | |||
13072 | // one past the last element of the array object, the behavior is | |||
13073 | // undefined. | |||
13074 | if (!LHSDesignator.Invalid && !RHSDesignator.Invalid && | |||
13075 | !AreElementsOfSameArray(getType(LHSValue.Base), LHSDesignator, | |||
13076 | RHSDesignator)) | |||
13077 | Info.CCEDiag(E, diag::note_constexpr_pointer_subtraction_not_same_array); | |||
13078 | ||||
13079 | QualType Type = E->getLHS()->getType(); | |||
13080 | QualType ElementType = Type->castAs<PointerType>()->getPointeeType(); | |||
13081 | ||||
13082 | CharUnits ElementSize; | |||
13083 | if (!HandleSizeof(Info, E->getExprLoc(), ElementType, ElementSize)) | |||
13084 | return false; | |||
13085 | ||||
13086 | // As an extension, a type may have zero size (empty struct or union in | |||
13087 | // C, array of zero length). Pointer subtraction in such cases has | |||
13088 | // undefined behavior, so is not constant. | |||
13089 | if (ElementSize.isZero()) { | |||
13090 | Info.FFDiag(E, diag::note_constexpr_pointer_subtraction_zero_size) | |||
13091 | << ElementType; | |||
13092 | return false; | |||
13093 | } | |||
13094 | ||||
13095 | // FIXME: LLVM and GCC both compute LHSOffset - RHSOffset at runtime, | |||
13096 | // and produce incorrect results when it overflows. Such behavior | |||
13097 | // appears to be non-conforming, but is common, so perhaps we should | |||
13098 | // assume the standard intended for such cases to be undefined behavior | |||
13099 | // and check for them. | |||
13100 | ||||
13101 | // Compute (LHSOffset - RHSOffset) / Size carefully, checking for | |||
13102 | // overflow in the final conversion to ptrdiff_t. | |||
13103 | APSInt LHS(llvm::APInt(65, (int64_t)LHSOffset.getQuantity(), true), false); | |||
13104 | APSInt RHS(llvm::APInt(65, (int64_t)RHSOffset.getQuantity(), true), false); | |||
13105 | APSInt ElemSize(llvm::APInt(65, (int64_t)ElementSize.getQuantity(), true), | |||
13106 | false); | |||
13107 | APSInt TrueResult = (LHS - RHS) / ElemSize; | |||
13108 | APSInt Result = TrueResult.trunc(Info.Ctx.getIntWidth(E->getType())); | |||
13109 | ||||
13110 | if (Result.extend(65) != TrueResult && | |||
13111 | !HandleOverflow(Info, E, TrueResult, E->getType())) | |||
13112 | return false; | |||
13113 | return Success(Result, E); | |||
13114 | } | |||
13115 | ||||
13116 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | |||
13117 | } | |||
13118 | ||||
13119 | /// VisitUnaryExprOrTypeTraitExpr - Evaluate a sizeof, alignof or vec_step with | |||
13120 | /// a result as the expression's type. | |||
13121 | bool IntExprEvaluator::VisitUnaryExprOrTypeTraitExpr( | |||
13122 | const UnaryExprOrTypeTraitExpr *E) { | |||
13123 | switch(E->getKind()) { | |||
13124 | case UETT_PreferredAlignOf: | |||
13125 | case UETT_AlignOf: { | |||
13126 | if (E->isArgumentType()) | |||
13127 | return Success(GetAlignOfType(Info, E->getArgumentType(), E->getKind()), | |||
13128 | E); | |||
13129 | else | |||
13130 | return Success(GetAlignOfExpr(Info, E->getArgumentExpr(), E->getKind()), | |||
13131 | E); | |||
13132 | } | |||
13133 | ||||
13134 | case UETT_VecStep: { | |||
13135 | QualType Ty = E->getTypeOfArgument(); | |||
13136 | ||||
13137 | if (Ty->isVectorType()) { | |||
13138 | unsigned n = Ty->castAs<VectorType>()->getNumElements(); | |||
13139 | ||||
13140 | // The vec_step built-in functions that take a 3-component | |||
13141 | // vector return 4. (OpenCL 1.1 spec 6.11.12) | |||
13142 | if (n == 3) | |||
13143 | n = 4; | |||
13144 | ||||
13145 | return Success(n, E); | |||
13146 | } else | |||
13147 | return Success(1, E); | |||
13148 | } | |||
13149 | ||||
13150 | case UETT_SizeOf: { | |||
13151 | QualType SrcTy = E->getTypeOfArgument(); | |||
13152 | // C++ [expr.sizeof]p2: "When applied to a reference or a reference type, | |||
13153 | // the result is the size of the referenced type." | |||
13154 | if (const ReferenceType *Ref = SrcTy->getAs<ReferenceType>()) | |||
13155 | SrcTy = Ref->getPointeeType(); | |||
13156 | ||||
13157 | CharUnits Sizeof; | |||
13158 | if (!HandleSizeof(Info, E->getExprLoc(), SrcTy, Sizeof)) | |||
13159 | return false; | |||
13160 | return Success(Sizeof, E); | |||
13161 | } | |||
13162 | case UETT_OpenMPRequiredSimdAlign: | |||
13163 | assert(E->isArgumentType())(static_cast <bool> (E->isArgumentType()) ? void (0) : __assert_fail ("E->isArgumentType()", "clang/lib/AST/ExprConstant.cpp" , 13163, __extension__ __PRETTY_FUNCTION__)); | |||
13164 | return Success( | |||
13165 | Info.Ctx.toCharUnitsFromBits( | |||
13166 | Info.Ctx.getOpenMPDefaultSimdAlign(E->getArgumentType())) | |||
13167 | .getQuantity(), | |||
13168 | E); | |||
13169 | } | |||
13170 | ||||
13171 | llvm_unreachable("unknown expr/type trait")::llvm::llvm_unreachable_internal("unknown expr/type trait", "clang/lib/AST/ExprConstant.cpp" , 13171); | |||
13172 | } | |||
13173 | ||||
13174 | bool IntExprEvaluator::VisitOffsetOfExpr(const OffsetOfExpr *OOE) { | |||
13175 | CharUnits Result; | |||
13176 | unsigned n = OOE->getNumComponents(); | |||
13177 | if (n == 0) | |||
13178 | return Error(OOE); | |||
13179 | QualType CurrentType = OOE->getTypeSourceInfo()->getType(); | |||
13180 | for (unsigned i = 0; i != n; ++i) { | |||
13181 | OffsetOfNode ON = OOE->getComponent(i); | |||
13182 | switch (ON.getKind()) { | |||
13183 | case OffsetOfNode::Array: { | |||
13184 | const Expr *Idx = OOE->getIndexExpr(ON.getArrayExprIndex()); | |||
13185 | APSInt IdxResult; | |||
13186 | if (!EvaluateInteger(Idx, IdxResult, Info)) | |||
13187 | return false; | |||
13188 | const ArrayType *AT = Info.Ctx.getAsArrayType(CurrentType); | |||
13189 | if (!AT) | |||
13190 | return Error(OOE); | |||
13191 | CurrentType = AT->getElementType(); | |||
13192 | CharUnits ElementSize = Info.Ctx.getTypeSizeInChars(CurrentType); | |||
13193 | Result += IdxResult.getSExtValue() * ElementSize; | |||
13194 | break; | |||
13195 | } | |||
13196 | ||||
13197 | case OffsetOfNode::Field: { | |||
13198 | FieldDecl *MemberDecl = ON.getField(); | |||
13199 | const RecordType *RT = CurrentType->getAs<RecordType>(); | |||
13200 | if (!RT) | |||
13201 | return Error(OOE); | |||
13202 | RecordDecl *RD = RT->getDecl(); | |||
13203 | if (RD->isInvalidDecl()) return false; | |||
13204 | const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); | |||
13205 | unsigned i = MemberDecl->getFieldIndex(); | |||
13206 | assert(i < RL.getFieldCount() && "offsetof field in wrong type")(static_cast <bool> (i < RL.getFieldCount() && "offsetof field in wrong type") ? void (0) : __assert_fail ( "i < RL.getFieldCount() && \"offsetof field in wrong type\"" , "clang/lib/AST/ExprConstant.cpp", 13206, __extension__ __PRETTY_FUNCTION__ )); | |||
13207 | Result += Info.Ctx.toCharUnitsFromBits(RL.getFieldOffset(i)); | |||
13208 | CurrentType = MemberDecl->getType().getNonReferenceType(); | |||
13209 | break; | |||
13210 | } | |||
13211 | ||||
13212 | case OffsetOfNode::Identifier: | |||
13213 | llvm_unreachable("dependent __builtin_offsetof")::llvm::llvm_unreachable_internal("dependent __builtin_offsetof" , "clang/lib/AST/ExprConstant.cpp", 13213); | |||
13214 | ||||
13215 | case OffsetOfNode::Base: { | |||
13216 | CXXBaseSpecifier *BaseSpec = ON.getBase(); | |||
13217 | if (BaseSpec->isVirtual()) | |||
13218 | return Error(OOE); | |||
13219 | ||||
13220 | // Find the layout of the class whose base we are looking into. | |||
13221 | const RecordType *RT = CurrentType->getAs<RecordType>(); | |||
13222 | if (!RT) | |||
13223 | return Error(OOE); | |||
13224 | RecordDecl *RD = RT->getDecl(); | |||
13225 | if (RD->isInvalidDecl()) return false; | |||
13226 | const ASTRecordLayout &RL = Info.Ctx.getASTRecordLayout(RD); | |||
13227 | ||||
13228 | // Find the base class itself. | |||
13229 | CurrentType = BaseSpec->getType(); | |||
13230 | const RecordType *BaseRT = CurrentType->getAs<RecordType>(); | |||
13231 | if (!BaseRT) | |||
13232 | return Error(OOE); | |||
13233 | ||||
13234 | // Add the offset to the base. | |||
13235 | Result += RL.getBaseClassOffset(cast<CXXRecordDecl>(BaseRT->getDecl())); | |||
13236 | break; | |||
13237 | } | |||
13238 | } | |||
13239 | } | |||
13240 | return Success(Result, OOE); | |||
13241 | } | |||
13242 | ||||
13243 | bool IntExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { | |||
13244 | switch (E->getOpcode()) { | |||
13245 | default: | |||
13246 | // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. | |||
13247 | // See C99 6.6p3. | |||
13248 | return Error(E); | |||
13249 | case UO_Extension: | |||
13250 | // FIXME: Should extension allow i-c-e extension expressions in its scope? | |||
13251 | // If so, we could clear the diagnostic ID. | |||
13252 | return Visit(E->getSubExpr()); | |||
13253 | case UO_Plus: | |||
13254 | // The result is just the value. | |||
13255 | return Visit(E->getSubExpr()); | |||
13256 | case UO_Minus: { | |||
13257 | if (!Visit(E->getSubExpr())) | |||
13258 | return false; | |||
13259 | if (!Result.isInt()) return Error(E); | |||
13260 | const APSInt &Value = Result.getInt(); | |||
13261 | if (Value.isSigned() && Value.isMinSignedValue() && E->canOverflow() && | |||
13262 | !HandleOverflow(Info, E, -Value.extend(Value.getBitWidth() + 1), | |||
13263 | E->getType())) | |||
13264 | return false; | |||
13265 | return Success(-Value, E); | |||
13266 | } | |||
13267 | case UO_Not: { | |||
13268 | if (!Visit(E->getSubExpr())) | |||
13269 | return false; | |||
13270 | if (!Result.isInt()) return Error(E); | |||
13271 | return Success(~Result.getInt(), E); | |||
13272 | } | |||
13273 | case UO_LNot: { | |||
13274 | bool bres; | |||
13275 | if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) | |||
13276 | return false; | |||
13277 | return Success(!bres, E); | |||
13278 | } | |||
13279 | } | |||
13280 | } | |||
13281 | ||||
13282 | /// HandleCast - This is used to evaluate implicit or explicit casts where the | |||
13283 | /// result type is integer. | |||
13284 | bool IntExprEvaluator::VisitCastExpr(const CastExpr *E) { | |||
13285 | const Expr *SubExpr = E->getSubExpr(); | |||
13286 | QualType DestType = E->getType(); | |||
13287 | QualType SrcType = SubExpr->getType(); | |||
13288 | ||||
13289 | switch (E->getCastKind()) { | |||
13290 | case CK_BaseToDerived: | |||
13291 | case CK_DerivedToBase: | |||
13292 | case CK_UncheckedDerivedToBase: | |||
13293 | case CK_Dynamic: | |||
13294 | case CK_ToUnion: | |||
13295 | case CK_ArrayToPointerDecay: | |||
13296 | case CK_FunctionToPointerDecay: | |||
13297 | case CK_NullToPointer: | |||
13298 | case CK_NullToMemberPointer: | |||
13299 | case CK_BaseToDerivedMemberPointer: | |||
13300 | case CK_DerivedToBaseMemberPointer: | |||
13301 | case CK_ReinterpretMemberPointer: | |||
13302 | case CK_ConstructorConversion: | |||
13303 | case CK_IntegralToPointer: | |||
13304 | case CK_ToVoid: | |||
13305 | case CK_VectorSplat: | |||
13306 | case CK_IntegralToFloating: | |||
13307 | case CK_FloatingCast: | |||
13308 | case CK_CPointerToObjCPointerCast: | |||
13309 | case CK_BlockPointerToObjCPointerCast: | |||
13310 | case CK_AnyPointerToBlockPointerCast: | |||
13311 | case CK_ObjCObjectLValueCast: | |||
13312 | case CK_FloatingRealToComplex: | |||
13313 | case CK_FloatingComplexToReal: | |||
13314 | case CK_FloatingComplexCast: | |||
13315 | case CK_FloatingComplexToIntegralComplex: | |||
13316 | case CK_IntegralRealToComplex: | |||
13317 | case CK_IntegralComplexCast: | |||
13318 | case CK_IntegralComplexToFloatingComplex: | |||
13319 | case CK_BuiltinFnToFnPtr: | |||
13320 | case CK_ZeroToOCLOpaqueType: | |||
13321 | case CK_NonAtomicToAtomic: | |||
13322 | case CK_AddressSpaceConversion: | |||
13323 | case CK_IntToOCLSampler: | |||
13324 | case CK_FloatingToFixedPoint: | |||
13325 | case CK_FixedPointToFloating: | |||
13326 | case CK_FixedPointCast: | |||
13327 | case CK_IntegralToFixedPoint: | |||
13328 | case CK_MatrixCast: | |||
13329 | llvm_unreachable("invalid cast kind for integral value")::llvm::llvm_unreachable_internal("invalid cast kind for integral value" , "clang/lib/AST/ExprConstant.cpp", 13329); | |||
13330 | ||||
13331 | case CK_BitCast: | |||
13332 | case CK_Dependent: | |||
13333 | case CK_LValueBitCast: | |||
13334 | case CK_ARCProduceObject: | |||
13335 | case CK_ARCConsumeObject: | |||
13336 | case CK_ARCReclaimReturnedObject: | |||
13337 | case CK_ARCExtendBlockObject: | |||
13338 | case CK_CopyAndAutoreleaseBlockObject: | |||
13339 | return Error(E); | |||
13340 | ||||
13341 | case CK_UserDefinedConversion: | |||
13342 | case CK_LValueToRValue: | |||
13343 | case CK_AtomicToNonAtomic: | |||
13344 | case CK_NoOp: | |||
13345 | case CK_LValueToRValueBitCast: | |||
13346 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
13347 | ||||
13348 | case CK_MemberPointerToBoolean: | |||
13349 | case CK_PointerToBoolean: | |||
13350 | case CK_IntegralToBoolean: | |||
13351 | case CK_FloatingToBoolean: | |||
13352 | case CK_BooleanToSignedIntegral: | |||
13353 | case CK_FloatingComplexToBoolean: | |||
13354 | case CK_IntegralComplexToBoolean: { | |||
13355 | bool BoolResult; | |||
13356 | if (!EvaluateAsBooleanCondition(SubExpr, BoolResult, Info)) | |||
13357 | return false; | |||
13358 | uint64_t IntResult = BoolResult; | |||
13359 | if (BoolResult && E->getCastKind() == CK_BooleanToSignedIntegral) | |||
13360 | IntResult = (uint64_t)-1; | |||
13361 | return Success(IntResult, E); | |||
13362 | } | |||
13363 | ||||
13364 | case CK_FixedPointToIntegral: { | |||
13365 | APFixedPoint Src(Info.Ctx.getFixedPointSemantics(SrcType)); | |||
13366 | if (!EvaluateFixedPoint(SubExpr, Src, Info)) | |||
13367 | return false; | |||
13368 | bool Overflowed; | |||
13369 | llvm::APSInt Result = Src.convertToInt( | |||
13370 | Info.Ctx.getIntWidth(DestType), | |||
13371 | DestType->isSignedIntegerOrEnumerationType(), &Overflowed); | |||
13372 | if (Overflowed && !HandleOverflow(Info, E, Result, DestType)) | |||
13373 | return false; | |||
13374 | return Success(Result, E); | |||
13375 | } | |||
13376 | ||||
13377 | case CK_FixedPointToBoolean: { | |||
13378 | // Unsigned padding does not affect this. | |||
13379 | APValue Val; | |||
13380 | if (!Evaluate(Val, Info, SubExpr)) | |||
13381 | return false; | |||
13382 | return Success(Val.getFixedPoint().getBoolValue(), E); | |||
13383 | } | |||
13384 | ||||
13385 | case CK_IntegralCast: { | |||
13386 | if (!Visit(SubExpr)) | |||
13387 | return false; | |||
13388 | ||||
13389 | if (!Result.isInt()) { | |||
13390 | // Allow casts of address-of-label differences if they are no-ops | |||
13391 | // or narrowing. (The narrowing case isn't actually guaranteed to | |||
13392 | // be constant-evaluatable except in some narrow cases which are hard | |||
13393 | // to detect here. We let it through on the assumption the user knows | |||
13394 | // what they are doing.) | |||
13395 | if (Result.isAddrLabelDiff()) | |||
13396 | return Info.Ctx.getTypeSize(DestType) <= Info.Ctx.getTypeSize(SrcType); | |||
13397 | // Only allow casts of lvalues if they are lossless. | |||
13398 | return Info.Ctx.getTypeSize(DestType) == Info.Ctx.getTypeSize(SrcType); | |||
13399 | } | |||
13400 | ||||
13401 | return Success(HandleIntToIntCast(Info, E, DestType, SrcType, | |||
13402 | Result.getInt()), E); | |||
13403 | } | |||
13404 | ||||
13405 | case CK_PointerToIntegral: { | |||
13406 | CCEDiag(E, diag::note_constexpr_invalid_cast) << 2; | |||
13407 | ||||
13408 | LValue LV; | |||
13409 | if (!EvaluatePointer(SubExpr, LV, Info)) | |||
13410 | return false; | |||
13411 | ||||
13412 | if (LV.getLValueBase()) { | |||
13413 | // Only allow based lvalue casts if they are lossless. | |||
13414 | // FIXME: Allow a larger integer size than the pointer size, and allow | |||
13415 | // narrowing back down to pointer width in subsequent integral casts. | |||
13416 | // FIXME: Check integer type's active bits, not its type size. | |||
13417 | if (Info.Ctx.getTypeSize(DestType) != Info.Ctx.getTypeSize(SrcType)) | |||
13418 | return Error(E); | |||
13419 | ||||
13420 | LV.Designator.setInvalid(); | |||
13421 | LV.moveInto(Result); | |||
13422 | return true; | |||
13423 | } | |||
13424 | ||||
13425 | APSInt AsInt; | |||
13426 | APValue V; | |||
13427 | LV.moveInto(V); | |||
13428 | if (!V.toIntegralConstant(AsInt, SrcType, Info.Ctx)) | |||
13429 | llvm_unreachable("Can't cast this!")::llvm::llvm_unreachable_internal("Can't cast this!", "clang/lib/AST/ExprConstant.cpp" , 13429); | |||
13430 | ||||
13431 | return Success(HandleIntToIntCast(Info, E, DestType, SrcType, AsInt), E); | |||
13432 | } | |||
13433 | ||||
13434 | case CK_IntegralComplexToReal: { | |||
13435 | ComplexValue C; | |||
13436 | if (!EvaluateComplex(SubExpr, C, Info)) | |||
13437 | return false; | |||
13438 | return Success(C.getComplexIntReal(), E); | |||
13439 | } | |||
13440 | ||||
13441 | case CK_FloatingToIntegral: { | |||
13442 | APFloat F(0.0); | |||
13443 | if (!EvaluateFloat(SubExpr, F, Info)) | |||
13444 | return false; | |||
13445 | ||||
13446 | APSInt Value; | |||
13447 | if (!HandleFloatToIntCast(Info, E, SrcType, F, DestType, Value)) | |||
13448 | return false; | |||
13449 | return Success(Value, E); | |||
13450 | } | |||
13451 | } | |||
13452 | ||||
13453 | llvm_unreachable("unknown cast resulting in integral value")::llvm::llvm_unreachable_internal("unknown cast resulting in integral value" , "clang/lib/AST/ExprConstant.cpp", 13453); | |||
13454 | } | |||
13455 | ||||
13456 | bool IntExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { | |||
13457 | if (E->getSubExpr()->getType()->isAnyComplexType()) { | |||
13458 | ComplexValue LV; | |||
13459 | if (!EvaluateComplex(E->getSubExpr(), LV, Info)) | |||
13460 | return false; | |||
13461 | if (!LV.isComplexInt()) | |||
13462 | return Error(E); | |||
13463 | return Success(LV.getComplexIntReal(), E); | |||
13464 | } | |||
13465 | ||||
13466 | return Visit(E->getSubExpr()); | |||
13467 | } | |||
13468 | ||||
13469 | bool IntExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { | |||
13470 | if (E->getSubExpr()->getType()->isComplexIntegerType()) { | |||
13471 | ComplexValue LV; | |||
13472 | if (!EvaluateComplex(E->getSubExpr(), LV, Info)) | |||
13473 | return false; | |||
13474 | if (!LV.isComplexInt()) | |||
13475 | return Error(E); | |||
13476 | return Success(LV.getComplexIntImag(), E); | |||
13477 | } | |||
13478 | ||||
13479 | VisitIgnoredValue(E->getSubExpr()); | |||
13480 | return Success(0, E); | |||
13481 | } | |||
13482 | ||||
13483 | bool IntExprEvaluator::VisitSizeOfPackExpr(const SizeOfPackExpr *E) { | |||
13484 | return Success(E->getPackLength(), E); | |||
13485 | } | |||
13486 | ||||
13487 | bool IntExprEvaluator::VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) { | |||
13488 | return Success(E->getValue(), E); | |||
13489 | } | |||
13490 | ||||
13491 | bool IntExprEvaluator::VisitConceptSpecializationExpr( | |||
13492 | const ConceptSpecializationExpr *E) { | |||
13493 | return Success(E->isSatisfied(), E); | |||
13494 | } | |||
13495 | ||||
13496 | bool IntExprEvaluator::VisitRequiresExpr(const RequiresExpr *E) { | |||
13497 | return Success(E->isSatisfied(), E); | |||
13498 | } | |||
13499 | ||||
13500 | bool FixedPointExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { | |||
13501 | switch (E->getOpcode()) { | |||
13502 | default: | |||
13503 | // Invalid unary operators | |||
13504 | return Error(E); | |||
13505 | case UO_Plus: | |||
13506 | // The result is just the value. | |||
13507 | return Visit(E->getSubExpr()); | |||
13508 | case UO_Minus: { | |||
13509 | if (!Visit(E->getSubExpr())) return false; | |||
13510 | if (!Result.isFixedPoint()) | |||
13511 | return Error(E); | |||
13512 | bool Overflowed; | |||
13513 | APFixedPoint Negated = Result.getFixedPoint().negate(&Overflowed); | |||
13514 | if (Overflowed && !HandleOverflow(Info, E, Negated, E->getType())) | |||
13515 | return false; | |||
13516 | return Success(Negated, E); | |||
13517 | } | |||
13518 | case UO_LNot: { | |||
13519 | bool bres; | |||
13520 | if (!EvaluateAsBooleanCondition(E->getSubExpr(), bres, Info)) | |||
13521 | return false; | |||
13522 | return Success(!bres, E); | |||
13523 | } | |||
13524 | } | |||
13525 | } | |||
13526 | ||||
13527 | bool FixedPointExprEvaluator::VisitCastExpr(const CastExpr *E) { | |||
13528 | const Expr *SubExpr = E->getSubExpr(); | |||
13529 | QualType DestType = E->getType(); | |||
13530 | assert(DestType->isFixedPointType() &&(static_cast <bool> (DestType->isFixedPointType() && "Expected destination type to be a fixed point type") ? void (0) : __assert_fail ("DestType->isFixedPointType() && \"Expected destination type to be a fixed point type\"" , "clang/lib/AST/ExprConstant.cpp", 13531, __extension__ __PRETTY_FUNCTION__ )) | |||
13531 | "Expected destination type to be a fixed point type")(static_cast <bool> (DestType->isFixedPointType() && "Expected destination type to be a fixed point type") ? void (0) : __assert_fail ("DestType->isFixedPointType() && \"Expected destination type to be a fixed point type\"" , "clang/lib/AST/ExprConstant.cpp", 13531, __extension__ __PRETTY_FUNCTION__ )); | |||
13532 | auto DestFXSema = Info.Ctx.getFixedPointSemantics(DestType); | |||
13533 | ||||
13534 | switch (E->getCastKind()) { | |||
13535 | case CK_FixedPointCast: { | |||
13536 | APFixedPoint Src(Info.Ctx.getFixedPointSemantics(SubExpr->getType())); | |||
13537 | if (!EvaluateFixedPoint(SubExpr, Src, Info)) | |||
13538 | return false; | |||
13539 | bool Overflowed; | |||
13540 | APFixedPoint Result = Src.convert(DestFXSema, &Overflowed); | |||
13541 | if (Overflowed) { | |||
13542 | if (Info.checkingForUndefinedBehavior()) | |||
13543 | Info.Ctx.getDiagnostics().Report(E->getExprLoc(), | |||
13544 | diag::warn_fixedpoint_constant_overflow) | |||
13545 | << Result.toString() << E->getType(); | |||
13546 | if (!HandleOverflow(Info, E, Result, E->getType())) | |||
13547 | return false; | |||
13548 | } | |||
13549 | return Success(Result, E); | |||
13550 | } | |||
13551 | case CK_IntegralToFixedPoint: { | |||
13552 | APSInt Src; | |||
13553 | if (!EvaluateInteger(SubExpr, Src, Info)) | |||
13554 | return false; | |||
13555 | ||||
13556 | bool Overflowed; | |||
13557 | APFixedPoint IntResult = APFixedPoint::getFromIntValue( | |||
13558 | Src, Info.Ctx.getFixedPointSemantics(DestType), &Overflowed); | |||
13559 | ||||
13560 | if (Overflowed) { | |||
13561 | if (Info.checkingForUndefinedBehavior()) | |||
13562 | Info.Ctx.getDiagnostics().Report(E->getExprLoc(), | |||
13563 | diag::warn_fixedpoint_constant_overflow) | |||
13564 | << IntResult.toString() << E->getType(); | |||
13565 | if (!HandleOverflow(Info, E, IntResult, E->getType())) | |||
13566 | return false; | |||
13567 | } | |||
13568 | ||||
13569 | return Success(IntResult, E); | |||
13570 | } | |||
13571 | case CK_FloatingToFixedPoint: { | |||
13572 | APFloat Src(0.0); | |||
13573 | if (!EvaluateFloat(SubExpr, Src, Info)) | |||
13574 | return false; | |||
13575 | ||||
13576 | bool Overflowed; | |||
13577 | APFixedPoint Result = APFixedPoint::getFromFloatValue( | |||
13578 | Src, Info.Ctx.getFixedPointSemantics(DestType), &Overflowed); | |||
13579 | ||||
13580 | if (Overflowed) { | |||
13581 | if (Info.checkingForUndefinedBehavior()) | |||
13582 | Info.Ctx.getDiagnostics().Report(E->getExprLoc(), | |||
13583 | diag::warn_fixedpoint_constant_overflow) | |||
13584 | << Result.toString() << E->getType(); | |||
13585 | if (!HandleOverflow(Info, E, Result, E->getType())) | |||
13586 | return false; | |||
13587 | } | |||
13588 | ||||
13589 | return Success(Result, E); | |||
13590 | } | |||
13591 | case CK_NoOp: | |||
13592 | case CK_LValueToRValue: | |||
13593 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
13594 | default: | |||
13595 | return Error(E); | |||
13596 | } | |||
13597 | } | |||
13598 | ||||
13599 | bool FixedPointExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | |||
13600 | if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) | |||
13601 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | |||
13602 | ||||
13603 | const Expr *LHS = E->getLHS(); | |||
13604 | const Expr *RHS = E->getRHS(); | |||
13605 | FixedPointSemantics ResultFXSema = | |||
13606 | Info.Ctx.getFixedPointSemantics(E->getType()); | |||
13607 | ||||
13608 | APFixedPoint LHSFX(Info.Ctx.getFixedPointSemantics(LHS->getType())); | |||
13609 | if (!EvaluateFixedPointOrInteger(LHS, LHSFX, Info)) | |||
13610 | return false; | |||
13611 | APFixedPoint RHSFX(Info.Ctx.getFixedPointSemantics(RHS->getType())); | |||
13612 | if (!EvaluateFixedPointOrInteger(RHS, RHSFX, Info)) | |||
13613 | return false; | |||
13614 | ||||
13615 | bool OpOverflow = false, ConversionOverflow = false; | |||
13616 | APFixedPoint Result(LHSFX.getSemantics()); | |||
13617 | switch (E->getOpcode()) { | |||
13618 | case BO_Add: { | |||
13619 | Result = LHSFX.add(RHSFX, &OpOverflow) | |||
13620 | .convert(ResultFXSema, &ConversionOverflow); | |||
13621 | break; | |||
13622 | } | |||
13623 | case BO_Sub: { | |||
13624 | Result = LHSFX.sub(RHSFX, &OpOverflow) | |||
13625 | .convert(ResultFXSema, &ConversionOverflow); | |||
13626 | break; | |||
13627 | } | |||
13628 | case BO_Mul: { | |||
13629 | Result = LHSFX.mul(RHSFX, &OpOverflow) | |||
13630 | .convert(ResultFXSema, &ConversionOverflow); | |||
13631 | break; | |||
13632 | } | |||
13633 | case BO_Div: { | |||
13634 | if (RHSFX.getValue() == 0) { | |||
13635 | Info.FFDiag(E, diag::note_expr_divide_by_zero); | |||
13636 | return false; | |||
13637 | } | |||
13638 | Result = LHSFX.div(RHSFX, &OpOverflow) | |||
13639 | .convert(ResultFXSema, &ConversionOverflow); | |||
13640 | break; | |||
13641 | } | |||
13642 | case BO_Shl: | |||
13643 | case BO_Shr: { | |||
13644 | FixedPointSemantics LHSSema = LHSFX.getSemantics(); | |||
13645 | llvm::APSInt RHSVal = RHSFX.getValue(); | |||
13646 | ||||
13647 | unsigned ShiftBW = | |||
13648 | LHSSema.getWidth() - (unsigned)LHSSema.hasUnsignedPadding(); | |||
13649 | unsigned Amt = RHSVal.getLimitedValue(ShiftBW - 1); | |||
13650 | // Embedded-C 4.1.6.2.2: | |||
13651 | // The right operand must be nonnegative and less than the total number | |||
13652 | // of (nonpadding) bits of the fixed-point operand ... | |||
13653 | if (RHSVal.isNegative()) | |||
13654 | Info.CCEDiag(E, diag::note_constexpr_negative_shift) << RHSVal; | |||
13655 | else if (Amt != RHSVal) | |||
13656 | Info.CCEDiag(E, diag::note_constexpr_large_shift) | |||
13657 | << RHSVal << E->getType() << ShiftBW; | |||
13658 | ||||
13659 | if (E->getOpcode() == BO_Shl) | |||
13660 | Result = LHSFX.shl(Amt, &OpOverflow); | |||
13661 | else | |||
13662 | Result = LHSFX.shr(Amt, &OpOverflow); | |||
13663 | break; | |||
13664 | } | |||
13665 | default: | |||
13666 | return false; | |||
13667 | } | |||
13668 | if (OpOverflow || ConversionOverflow) { | |||
13669 | if (Info.checkingForUndefinedBehavior()) | |||
13670 | Info.Ctx.getDiagnostics().Report(E->getExprLoc(), | |||
13671 | diag::warn_fixedpoint_constant_overflow) | |||
13672 | << Result.toString() << E->getType(); | |||
13673 | if (!HandleOverflow(Info, E, Result, E->getType())) | |||
13674 | return false; | |||
13675 | } | |||
13676 | return Success(Result, E); | |||
13677 | } | |||
13678 | ||||
13679 | //===----------------------------------------------------------------------===// | |||
13680 | // Float Evaluation | |||
13681 | //===----------------------------------------------------------------------===// | |||
13682 | ||||
13683 | namespace { | |||
13684 | class FloatExprEvaluator | |||
13685 | : public ExprEvaluatorBase<FloatExprEvaluator> { | |||
13686 | APFloat &Result; | |||
13687 | public: | |||
13688 | FloatExprEvaluator(EvalInfo &info, APFloat &result) | |||
13689 | : ExprEvaluatorBaseTy(info), Result(result) {} | |||
13690 | ||||
13691 | bool Success(const APValue &V, const Expr *e) { | |||
13692 | Result = V.getFloat(); | |||
13693 | return true; | |||
13694 | } | |||
13695 | ||||
13696 | bool ZeroInitialization(const Expr *E) { | |||
13697 | Result = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(E->getType())); | |||
13698 | return true; | |||
13699 | } | |||
13700 | ||||
13701 | bool VisitCallExpr(const CallExpr *E); | |||
13702 | ||||
13703 | bool VisitUnaryOperator(const UnaryOperator *E); | |||
13704 | bool VisitBinaryOperator(const BinaryOperator *E); | |||
13705 | bool VisitFloatingLiteral(const FloatingLiteral *E); | |||
13706 | bool VisitCastExpr(const CastExpr *E); | |||
13707 | ||||
13708 | bool VisitUnaryReal(const UnaryOperator *E); | |||
13709 | bool VisitUnaryImag(const UnaryOperator *E); | |||
13710 | ||||
13711 | // FIXME: Missing: array subscript of vector, member of vector | |||
13712 | }; | |||
13713 | } // end anonymous namespace | |||
13714 | ||||
13715 | static bool EvaluateFloat(const Expr* E, APFloat& Result, EvalInfo &Info) { | |||
13716 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 13716, __extension__ __PRETTY_FUNCTION__)); | |||
13717 | assert(E->isPRValue() && E->getType()->isRealFloatingType())(static_cast <bool> (E->isPRValue() && E-> getType()->isRealFloatingType()) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isRealFloatingType()" , "clang/lib/AST/ExprConstant.cpp", 13717, __extension__ __PRETTY_FUNCTION__ )); | |||
13718 | return FloatExprEvaluator(Info, Result).Visit(E); | |||
13719 | } | |||
13720 | ||||
13721 | static bool TryEvaluateBuiltinNaN(const ASTContext &Context, | |||
13722 | QualType ResultTy, | |||
13723 | const Expr *Arg, | |||
13724 | bool SNaN, | |||
13725 | llvm::APFloat &Result) { | |||
13726 | const StringLiteral *S = dyn_cast<StringLiteral>(Arg->IgnoreParenCasts()); | |||
13727 | if (!S) return false; | |||
13728 | ||||
13729 | const llvm::fltSemantics &Sem = Context.getFloatTypeSemantics(ResultTy); | |||
13730 | ||||
13731 | llvm::APInt fill; | |||
13732 | ||||
13733 | // Treat empty strings as if they were zero. | |||
13734 | if (S->getString().empty()) | |||
13735 | fill = llvm::APInt(32, 0); | |||
13736 | else if (S->getString().getAsInteger(0, fill)) | |||
13737 | return false; | |||
13738 | ||||
13739 | if (Context.getTargetInfo().isNan2008()) { | |||
13740 | if (SNaN) | |||
13741 | Result = llvm::APFloat::getSNaN(Sem, false, &fill); | |||
13742 | else | |||
13743 | Result = llvm::APFloat::getQNaN(Sem, false, &fill); | |||
13744 | } else { | |||
13745 | // Prior to IEEE 754-2008, architectures were allowed to choose whether | |||
13746 | // the first bit of their significand was set for qNaN or sNaN. MIPS chose | |||
13747 | // a different encoding to what became a standard in 2008, and for pre- | |||
13748 | // 2008 revisions, MIPS interpreted sNaN-2008 as qNan and qNaN-2008 as | |||
13749 | // sNaN. This is now known as "legacy NaN" encoding. | |||
13750 | if (SNaN) | |||
13751 | Result = llvm::APFloat::getQNaN(Sem, false, &fill); | |||
13752 | else | |||
13753 | Result = llvm::APFloat::getSNaN(Sem, false, &fill); | |||
13754 | } | |||
13755 | ||||
13756 | return true; | |||
13757 | } | |||
13758 | ||||
13759 | bool FloatExprEvaluator::VisitCallExpr(const CallExpr *E) { | |||
13760 | switch (E->getBuiltinCallee()) { | |||
13761 | default: | |||
13762 | return ExprEvaluatorBaseTy::VisitCallExpr(E); | |||
13763 | ||||
13764 | case Builtin::BI__builtin_huge_val: | |||
13765 | case Builtin::BI__builtin_huge_valf: | |||
13766 | case Builtin::BI__builtin_huge_vall: | |||
13767 | case Builtin::BI__builtin_huge_valf128: | |||
13768 | case Builtin::BI__builtin_inf: | |||
13769 | case Builtin::BI__builtin_inff: | |||
13770 | case Builtin::BI__builtin_infl: | |||
13771 | case Builtin::BI__builtin_inff128: { | |||
13772 | const llvm::fltSemantics &Sem = | |||
13773 | Info.Ctx.getFloatTypeSemantics(E->getType()); | |||
13774 | Result = llvm::APFloat::getInf(Sem); | |||
13775 | return true; | |||
13776 | } | |||
13777 | ||||
13778 | case Builtin::BI__builtin_nans: | |||
13779 | case Builtin::BI__builtin_nansf: | |||
13780 | case Builtin::BI__builtin_nansl: | |||
13781 | case Builtin::BI__builtin_nansf128: | |||
13782 | if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), | |||
13783 | true, Result)) | |||
13784 | return Error(E); | |||
13785 | return true; | |||
13786 | ||||
13787 | case Builtin::BI__builtin_nan: | |||
13788 | case Builtin::BI__builtin_nanf: | |||
13789 | case Builtin::BI__builtin_nanl: | |||
13790 | case Builtin::BI__builtin_nanf128: | |||
13791 | // If this is __builtin_nan() turn this into a nan, otherwise we | |||
13792 | // can't constant fold it. | |||
13793 | if (!TryEvaluateBuiltinNaN(Info.Ctx, E->getType(), E->getArg(0), | |||
13794 | false, Result)) | |||
13795 | return Error(E); | |||
13796 | return true; | |||
13797 | ||||
13798 | case Builtin::BI__builtin_fabs: | |||
13799 | case Builtin::BI__builtin_fabsf: | |||
13800 | case Builtin::BI__builtin_fabsl: | |||
13801 | case Builtin::BI__builtin_fabsf128: | |||
13802 | // The C standard says "fabs raises no floating-point exceptions, | |||
13803 | // even if x is a signaling NaN. The returned value is independent of | |||
13804 | // the current rounding direction mode." Therefore constant folding can | |||
13805 | // proceed without regard to the floating point settings. | |||
13806 | // Reference, WG14 N2478 F.10.4.3 | |||
13807 | if (!EvaluateFloat(E->getArg(0), Result, Info)) | |||
13808 | return false; | |||
13809 | ||||
13810 | if (Result.isNegative()) | |||
13811 | Result.changeSign(); | |||
13812 | return true; | |||
13813 | ||||
13814 | case Builtin::BI__arithmetic_fence: | |||
13815 | return EvaluateFloat(E->getArg(0), Result, Info); | |||
13816 | ||||
13817 | // FIXME: Builtin::BI__builtin_powi | |||
13818 | // FIXME: Builtin::BI__builtin_powif | |||
13819 | // FIXME: Builtin::BI__builtin_powil | |||
13820 | ||||
13821 | case Builtin::BI__builtin_copysign: | |||
13822 | case Builtin::BI__builtin_copysignf: | |||
13823 | case Builtin::BI__builtin_copysignl: | |||
13824 | case Builtin::BI__builtin_copysignf128: { | |||
13825 | APFloat RHS(0.); | |||
13826 | if (!EvaluateFloat(E->getArg(0), Result, Info) || | |||
13827 | !EvaluateFloat(E->getArg(1), RHS, Info)) | |||
13828 | return false; | |||
13829 | Result.copySign(RHS); | |||
13830 | return true; | |||
13831 | } | |||
13832 | } | |||
13833 | } | |||
13834 | ||||
13835 | bool FloatExprEvaluator::VisitUnaryReal(const UnaryOperator *E) { | |||
13836 | if (E->getSubExpr()->getType()->isAnyComplexType()) { | |||
13837 | ComplexValue CV; | |||
13838 | if (!EvaluateComplex(E->getSubExpr(), CV, Info)) | |||
13839 | return false; | |||
13840 | Result = CV.FloatReal; | |||
13841 | return true; | |||
13842 | } | |||
13843 | ||||
13844 | return Visit(E->getSubExpr()); | |||
13845 | } | |||
13846 | ||||
13847 | bool FloatExprEvaluator::VisitUnaryImag(const UnaryOperator *E) { | |||
13848 | if (E->getSubExpr()->getType()->isAnyComplexType()) { | |||
13849 | ComplexValue CV; | |||
13850 | if (!EvaluateComplex(E->getSubExpr(), CV, Info)) | |||
13851 | return false; | |||
13852 | Result = CV.FloatImag; | |||
13853 | return true; | |||
13854 | } | |||
13855 | ||||
13856 | VisitIgnoredValue(E->getSubExpr()); | |||
13857 | const llvm::fltSemantics &Sem = Info.Ctx.getFloatTypeSemantics(E->getType()); | |||
13858 | Result = llvm::APFloat::getZero(Sem); | |||
13859 | return true; | |||
13860 | } | |||
13861 | ||||
13862 | bool FloatExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { | |||
13863 | switch (E->getOpcode()) { | |||
13864 | default: return Error(E); | |||
13865 | case UO_Plus: | |||
13866 | return EvaluateFloat(E->getSubExpr(), Result, Info); | |||
13867 | case UO_Minus: | |||
13868 | // In C standard, WG14 N2478 F.3 p4 | |||
13869 | // "the unary - raises no floating point exceptions, | |||
13870 | // even if the operand is signalling." | |||
13871 | if (!EvaluateFloat(E->getSubExpr(), Result, Info)) | |||
13872 | return false; | |||
13873 | Result.changeSign(); | |||
13874 | return true; | |||
13875 | } | |||
13876 | } | |||
13877 | ||||
13878 | bool FloatExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | |||
13879 | if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) | |||
13880 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | |||
13881 | ||||
13882 | APFloat RHS(0.0); | |||
13883 | bool LHSOK = EvaluateFloat(E->getLHS(), Result, Info); | |||
13884 | if (!LHSOK && !Info.noteFailure()) | |||
13885 | return false; | |||
13886 | return EvaluateFloat(E->getRHS(), RHS, Info) && LHSOK && | |||
13887 | handleFloatFloatBinOp(Info, E, Result, E->getOpcode(), RHS); | |||
13888 | } | |||
13889 | ||||
13890 | bool FloatExprEvaluator::VisitFloatingLiteral(const FloatingLiteral *E) { | |||
13891 | Result = E->getValue(); | |||
13892 | return true; | |||
13893 | } | |||
13894 | ||||
13895 | bool FloatExprEvaluator::VisitCastExpr(const CastExpr *E) { | |||
13896 | const Expr* SubExpr = E->getSubExpr(); | |||
13897 | ||||
13898 | switch (E->getCastKind()) { | |||
13899 | default: | |||
13900 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
13901 | ||||
13902 | case CK_IntegralToFloating: { | |||
13903 | APSInt IntResult; | |||
13904 | const FPOptions FPO = E->getFPFeaturesInEffect( | |||
13905 | Info.Ctx.getLangOpts()); | |||
13906 | return EvaluateInteger(SubExpr, IntResult, Info) && | |||
13907 | HandleIntToFloatCast(Info, E, FPO, SubExpr->getType(), | |||
13908 | IntResult, E->getType(), Result); | |||
13909 | } | |||
13910 | ||||
13911 | case CK_FixedPointToFloating: { | |||
13912 | APFixedPoint FixResult(Info.Ctx.getFixedPointSemantics(SubExpr->getType())); | |||
13913 | if (!EvaluateFixedPoint(SubExpr, FixResult, Info)) | |||
13914 | return false; | |||
13915 | Result = | |||
13916 | FixResult.convertToFloat(Info.Ctx.getFloatTypeSemantics(E->getType())); | |||
13917 | return true; | |||
13918 | } | |||
13919 | ||||
13920 | case CK_FloatingCast: { | |||
13921 | if (!Visit(SubExpr)) | |||
13922 | return false; | |||
13923 | return HandleFloatToFloatCast(Info, E, SubExpr->getType(), E->getType(), | |||
13924 | Result); | |||
13925 | } | |||
13926 | ||||
13927 | case CK_FloatingComplexToReal: { | |||
13928 | ComplexValue V; | |||
13929 | if (!EvaluateComplex(SubExpr, V, Info)) | |||
13930 | return false; | |||
13931 | Result = V.getComplexFloatReal(); | |||
13932 | return true; | |||
13933 | } | |||
13934 | } | |||
13935 | } | |||
13936 | ||||
13937 | //===----------------------------------------------------------------------===// | |||
13938 | // Complex Evaluation (for float and integer) | |||
13939 | //===----------------------------------------------------------------------===// | |||
13940 | ||||
13941 | namespace { | |||
13942 | class ComplexExprEvaluator | |||
13943 | : public ExprEvaluatorBase<ComplexExprEvaluator> { | |||
13944 | ComplexValue &Result; | |||
13945 | ||||
13946 | public: | |||
13947 | ComplexExprEvaluator(EvalInfo &info, ComplexValue &Result) | |||
13948 | : ExprEvaluatorBaseTy(info), Result(Result) {} | |||
13949 | ||||
13950 | bool Success(const APValue &V, const Expr *e) { | |||
13951 | Result.setFrom(V); | |||
13952 | return true; | |||
13953 | } | |||
13954 | ||||
13955 | bool ZeroInitialization(const Expr *E); | |||
13956 | ||||
13957 | //===--------------------------------------------------------------------===// | |||
13958 | // Visitor Methods | |||
13959 | //===--------------------------------------------------------------------===// | |||
13960 | ||||
13961 | bool VisitImaginaryLiteral(const ImaginaryLiteral *E); | |||
13962 | bool VisitCastExpr(const CastExpr *E); | |||
13963 | bool VisitBinaryOperator(const BinaryOperator *E); | |||
13964 | bool VisitUnaryOperator(const UnaryOperator *E); | |||
13965 | bool VisitInitListExpr(const InitListExpr *E); | |||
13966 | bool VisitCallExpr(const CallExpr *E); | |||
13967 | }; | |||
13968 | } // end anonymous namespace | |||
13969 | ||||
13970 | static bool EvaluateComplex(const Expr *E, ComplexValue &Result, | |||
13971 | EvalInfo &Info) { | |||
13972 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 13972, __extension__ __PRETTY_FUNCTION__)); | |||
13973 | assert(E->isPRValue() && E->getType()->isAnyComplexType())(static_cast <bool> (E->isPRValue() && E-> getType()->isAnyComplexType()) ? void (0) : __assert_fail ( "E->isPRValue() && E->getType()->isAnyComplexType()" , "clang/lib/AST/ExprConstant.cpp", 13973, __extension__ __PRETTY_FUNCTION__ )); | |||
13974 | return ComplexExprEvaluator(Info, Result).Visit(E); | |||
13975 | } | |||
13976 | ||||
13977 | bool ComplexExprEvaluator::ZeroInitialization(const Expr *E) { | |||
13978 | QualType ElemTy = E->getType()->castAs<ComplexType>()->getElementType(); | |||
13979 | if (ElemTy->isRealFloatingType()) { | |||
13980 | Result.makeComplexFloat(); | |||
13981 | APFloat Zero = APFloat::getZero(Info.Ctx.getFloatTypeSemantics(ElemTy)); | |||
13982 | Result.FloatReal = Zero; | |||
13983 | Result.FloatImag = Zero; | |||
13984 | } else { | |||
13985 | Result.makeComplexInt(); | |||
13986 | APSInt Zero = Info.Ctx.MakeIntValue(0, ElemTy); | |||
13987 | Result.IntReal = Zero; | |||
13988 | Result.IntImag = Zero; | |||
13989 | } | |||
13990 | return true; | |||
13991 | } | |||
13992 | ||||
13993 | bool ComplexExprEvaluator::VisitImaginaryLiteral(const ImaginaryLiteral *E) { | |||
13994 | const Expr* SubExpr = E->getSubExpr(); | |||
13995 | ||||
13996 | if (SubExpr->getType()->isRealFloatingType()) { | |||
13997 | Result.makeComplexFloat(); | |||
13998 | APFloat &Imag = Result.FloatImag; | |||
13999 | if (!EvaluateFloat(SubExpr, Imag, Info)) | |||
14000 | return false; | |||
14001 | ||||
14002 | Result.FloatReal = APFloat(Imag.getSemantics()); | |||
14003 | return true; | |||
14004 | } else { | |||
14005 | assert(SubExpr->getType()->isIntegerType() &&(static_cast <bool> (SubExpr->getType()->isIntegerType () && "Unexpected imaginary literal.") ? void (0) : __assert_fail ("SubExpr->getType()->isIntegerType() && \"Unexpected imaginary literal.\"" , "clang/lib/AST/ExprConstant.cpp", 14006, __extension__ __PRETTY_FUNCTION__ )) | |||
14006 | "Unexpected imaginary literal.")(static_cast <bool> (SubExpr->getType()->isIntegerType () && "Unexpected imaginary literal.") ? void (0) : __assert_fail ("SubExpr->getType()->isIntegerType() && \"Unexpected imaginary literal.\"" , "clang/lib/AST/ExprConstant.cpp", 14006, __extension__ __PRETTY_FUNCTION__ )); | |||
14007 | ||||
14008 | Result.makeComplexInt(); | |||
14009 | APSInt &Imag = Result.IntImag; | |||
14010 | if (!EvaluateInteger(SubExpr, Imag, Info)) | |||
14011 | return false; | |||
14012 | ||||
14013 | Result.IntReal = APSInt(Imag.getBitWidth(), !Imag.isSigned()); | |||
14014 | return true; | |||
14015 | } | |||
14016 | } | |||
14017 | ||||
14018 | bool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) { | |||
14019 | ||||
14020 | switch (E->getCastKind()) { | |||
14021 | case CK_BitCast: | |||
14022 | case CK_BaseToDerived: | |||
14023 | case CK_DerivedToBase: | |||
14024 | case CK_UncheckedDerivedToBase: | |||
14025 | case CK_Dynamic: | |||
14026 | case CK_ToUnion: | |||
14027 | case CK_ArrayToPointerDecay: | |||
14028 | case CK_FunctionToPointerDecay: | |||
14029 | case CK_NullToPointer: | |||
14030 | case CK_NullToMemberPointer: | |||
14031 | case CK_BaseToDerivedMemberPointer: | |||
14032 | case CK_DerivedToBaseMemberPointer: | |||
14033 | case CK_MemberPointerToBoolean: | |||
14034 | case CK_ReinterpretMemberPointer: | |||
14035 | case CK_ConstructorConversion: | |||
14036 | case CK_IntegralToPointer: | |||
14037 | case CK_PointerToIntegral: | |||
14038 | case CK_PointerToBoolean: | |||
14039 | case CK_ToVoid: | |||
14040 | case CK_VectorSplat: | |||
14041 | case CK_IntegralCast: | |||
14042 | case CK_BooleanToSignedIntegral: | |||
14043 | case CK_IntegralToBoolean: | |||
14044 | case CK_IntegralToFloating: | |||
14045 | case CK_FloatingToIntegral: | |||
14046 | case CK_FloatingToBoolean: | |||
14047 | case CK_FloatingCast: | |||
14048 | case CK_CPointerToObjCPointerCast: | |||
14049 | case CK_BlockPointerToObjCPointerCast: | |||
14050 | case CK_AnyPointerToBlockPointerCast: | |||
14051 | case CK_ObjCObjectLValueCast: | |||
14052 | case CK_FloatingComplexToReal: | |||
14053 | case CK_FloatingComplexToBoolean: | |||
14054 | case CK_IntegralComplexToReal: | |||
14055 | case CK_IntegralComplexToBoolean: | |||
14056 | case CK_ARCProduceObject: | |||
14057 | case CK_ARCConsumeObject: | |||
14058 | case CK_ARCReclaimReturnedObject: | |||
14059 | case CK_ARCExtendBlockObject: | |||
14060 | case CK_CopyAndAutoreleaseBlockObject: | |||
14061 | case CK_BuiltinFnToFnPtr: | |||
14062 | case CK_ZeroToOCLOpaqueType: | |||
14063 | case CK_NonAtomicToAtomic: | |||
14064 | case CK_AddressSpaceConversion: | |||
14065 | case CK_IntToOCLSampler: | |||
14066 | case CK_FloatingToFixedPoint: | |||
14067 | case CK_FixedPointToFloating: | |||
14068 | case CK_FixedPointCast: | |||
14069 | case CK_FixedPointToBoolean: | |||
14070 | case CK_FixedPointToIntegral: | |||
14071 | case CK_IntegralToFixedPoint: | |||
14072 | case CK_MatrixCast: | |||
14073 | llvm_unreachable("invalid cast kind for complex value")::llvm::llvm_unreachable_internal("invalid cast kind for complex value" , "clang/lib/AST/ExprConstant.cpp", 14073); | |||
14074 | ||||
14075 | case CK_LValueToRValue: | |||
14076 | case CK_AtomicToNonAtomic: | |||
14077 | case CK_NoOp: | |||
14078 | case CK_LValueToRValueBitCast: | |||
14079 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
14080 | ||||
14081 | case CK_Dependent: | |||
14082 | case CK_LValueBitCast: | |||
14083 | case CK_UserDefinedConversion: | |||
14084 | return Error(E); | |||
14085 | ||||
14086 | case CK_FloatingRealToComplex: { | |||
14087 | APFloat &Real = Result.FloatReal; | |||
14088 | if (!EvaluateFloat(E->getSubExpr(), Real, Info)) | |||
14089 | return false; | |||
14090 | ||||
14091 | Result.makeComplexFloat(); | |||
14092 | Result.FloatImag = APFloat(Real.getSemantics()); | |||
14093 | return true; | |||
14094 | } | |||
14095 | ||||
14096 | case CK_FloatingComplexCast: { | |||
14097 | if (!Visit(E->getSubExpr())) | |||
14098 | return false; | |||
14099 | ||||
14100 | QualType To = E->getType()->castAs<ComplexType>()->getElementType(); | |||
14101 | QualType From | |||
14102 | = E->getSubExpr()->getType()->castAs<ComplexType>()->getElementType(); | |||
14103 | ||||
14104 | return HandleFloatToFloatCast(Info, E, From, To, Result.FloatReal) && | |||
14105 | HandleFloatToFloatCast(Info, E, From, To, Result.FloatImag); | |||
14106 | } | |||
14107 | ||||
14108 | case CK_FloatingComplexToIntegralComplex: { | |||
14109 | if (!Visit(E->getSubExpr())) | |||
14110 | return false; | |||
14111 | ||||
14112 | QualType To = E->getType()->castAs<ComplexType>()->getElementType(); | |||
14113 | QualType From | |||
14114 | = E->getSubExpr()->getType()->castAs<ComplexType>()->getElementType(); | |||
14115 | Result.makeComplexInt(); | |||
14116 | return HandleFloatToIntCast(Info, E, From, Result.FloatReal, | |||
14117 | To, Result.IntReal) && | |||
14118 | HandleFloatToIntCast(Info, E, From, Result.FloatImag, | |||
14119 | To, Result.IntImag); | |||
14120 | } | |||
14121 | ||||
14122 | case CK_IntegralRealToComplex: { | |||
14123 | APSInt &Real = Result.IntReal; | |||
14124 | if (!EvaluateInteger(E->getSubExpr(), Real, Info)) | |||
14125 | return false; | |||
14126 | ||||
14127 | Result.makeComplexInt(); | |||
14128 | Result.IntImag = APSInt(Real.getBitWidth(), !Real.isSigned()); | |||
14129 | return true; | |||
14130 | } | |||
14131 | ||||
14132 | case CK_IntegralComplexCast: { | |||
14133 | if (!Visit(E->getSubExpr())) | |||
14134 | return false; | |||
14135 | ||||
14136 | QualType To = E->getType()->castAs<ComplexType>()->getElementType(); | |||
14137 | QualType From | |||
14138 | = E->getSubExpr()->getType()->castAs<ComplexType>()->getElementType(); | |||
14139 | ||||
14140 | Result.IntReal = HandleIntToIntCast(Info, E, To, From, Result.IntReal); | |||
14141 | Result.IntImag = HandleIntToIntCast(Info, E, To, From, Result.IntImag); | |||
14142 | return true; | |||
14143 | } | |||
14144 | ||||
14145 | case CK_IntegralComplexToFloatingComplex: { | |||
14146 | if (!Visit(E->getSubExpr())) | |||
14147 | return false; | |||
14148 | ||||
14149 | const FPOptions FPO = E->getFPFeaturesInEffect( | |||
14150 | Info.Ctx.getLangOpts()); | |||
14151 | QualType To = E->getType()->castAs<ComplexType>()->getElementType(); | |||
14152 | QualType From | |||
14153 | = E->getSubExpr()->getType()->castAs<ComplexType>()->getElementType(); | |||
14154 | Result.makeComplexFloat(); | |||
14155 | return HandleIntToFloatCast(Info, E, FPO, From, Result.IntReal, | |||
14156 | To, Result.FloatReal) && | |||
14157 | HandleIntToFloatCast(Info, E, FPO, From, Result.IntImag, | |||
14158 | To, Result.FloatImag); | |||
14159 | } | |||
14160 | } | |||
14161 | ||||
14162 | llvm_unreachable("unknown cast resulting in complex value")::llvm::llvm_unreachable_internal("unknown cast resulting in complex value" , "clang/lib/AST/ExprConstant.cpp", 14162); | |||
14163 | } | |||
14164 | ||||
14165 | bool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) { | |||
14166 | if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma) | |||
14167 | return ExprEvaluatorBaseTy::VisitBinaryOperator(E); | |||
14168 | ||||
14169 | // Track whether the LHS or RHS is real at the type system level. When this is | |||
14170 | // the case we can simplify our evaluation strategy. | |||
14171 | bool LHSReal = false, RHSReal = false; | |||
14172 | ||||
14173 | bool LHSOK; | |||
14174 | if (E->getLHS()->getType()->isRealFloatingType()) { | |||
14175 | LHSReal = true; | |||
14176 | APFloat &Real = Result.FloatReal; | |||
14177 | LHSOK = EvaluateFloat(E->getLHS(), Real, Info); | |||
14178 | if (LHSOK) { | |||
14179 | Result.makeComplexFloat(); | |||
14180 | Result.FloatImag = APFloat(Real.getSemantics()); | |||
14181 | } | |||
14182 | } else { | |||
14183 | LHSOK = Visit(E->getLHS()); | |||
14184 | } | |||
14185 | if (!LHSOK && !Info.noteFailure()) | |||
14186 | return false; | |||
14187 | ||||
14188 | ComplexValue RHS; | |||
14189 | if (E->getRHS()->getType()->isRealFloatingType()) { | |||
14190 | RHSReal = true; | |||
14191 | APFloat &Real = RHS.FloatReal; | |||
14192 | if (!EvaluateFloat(E->getRHS(), Real, Info) || !LHSOK) | |||
14193 | return false; | |||
14194 | RHS.makeComplexFloat(); | |||
14195 | RHS.FloatImag = APFloat(Real.getSemantics()); | |||
14196 | } else if (!EvaluateComplex(E->getRHS(), RHS, Info) || !LHSOK) | |||
14197 | return false; | |||
14198 | ||||
14199 | assert(!(LHSReal && RHSReal) &&(static_cast <bool> (!(LHSReal && RHSReal) && "Cannot have both operands of a complex operation be real.") ? void (0) : __assert_fail ("!(LHSReal && RHSReal) && \"Cannot have both operands of a complex operation be real.\"" , "clang/lib/AST/ExprConstant.cpp", 14200, __extension__ __PRETTY_FUNCTION__ )) | |||
14200 | "Cannot have both operands of a complex operation be real.")(static_cast <bool> (!(LHSReal && RHSReal) && "Cannot have both operands of a complex operation be real.") ? void (0) : __assert_fail ("!(LHSReal && RHSReal) && \"Cannot have both operands of a complex operation be real.\"" , "clang/lib/AST/ExprConstant.cpp", 14200, __extension__ __PRETTY_FUNCTION__ )); | |||
14201 | switch (E->getOpcode()) { | |||
14202 | default: return Error(E); | |||
14203 | case BO_Add: | |||
14204 | if (Result.isComplexFloat()) { | |||
14205 | Result.getComplexFloatReal().add(RHS.getComplexFloatReal(), | |||
14206 | APFloat::rmNearestTiesToEven); | |||
14207 | if (LHSReal) | |||
14208 | Result.getComplexFloatImag() = RHS.getComplexFloatImag(); | |||
14209 | else if (!RHSReal) | |||
14210 | Result.getComplexFloatImag().add(RHS.getComplexFloatImag(), | |||
14211 | APFloat::rmNearestTiesToEven); | |||
14212 | } else { | |||
14213 | Result.getComplexIntReal() += RHS.getComplexIntReal(); | |||
14214 | Result.getComplexIntImag() += RHS.getComplexIntImag(); | |||
14215 | } | |||
14216 | break; | |||
14217 | case BO_Sub: | |||
14218 | if (Result.isComplexFloat()) { | |||
14219 | Result.getComplexFloatReal().subtract(RHS.getComplexFloatReal(), | |||
14220 | APFloat::rmNearestTiesToEven); | |||
14221 | if (LHSReal) { | |||
14222 | Result.getComplexFloatImag() = RHS.getComplexFloatImag(); | |||
14223 | Result.getComplexFloatImag().changeSign(); | |||
14224 | } else if (!RHSReal) { | |||
14225 | Result.getComplexFloatImag().subtract(RHS.getComplexFloatImag(), | |||
14226 | APFloat::rmNearestTiesToEven); | |||
14227 | } | |||
14228 | } else { | |||
14229 | Result.getComplexIntReal() -= RHS.getComplexIntReal(); | |||
14230 | Result.getComplexIntImag() -= RHS.getComplexIntImag(); | |||
14231 | } | |||
14232 | break; | |||
14233 | case BO_Mul: | |||
14234 | if (Result.isComplexFloat()) { | |||
14235 | // This is an implementation of complex multiplication according to the | |||
14236 | // constraints laid out in C11 Annex G. The implementation uses the | |||
14237 | // following naming scheme: | |||
14238 | // (a + ib) * (c + id) | |||
14239 | ComplexValue LHS = Result; | |||
14240 | APFloat &A = LHS.getComplexFloatReal(); | |||
14241 | APFloat &B = LHS.getComplexFloatImag(); | |||
14242 | APFloat &C = RHS.getComplexFloatReal(); | |||
14243 | APFloat &D = RHS.getComplexFloatImag(); | |||
14244 | APFloat &ResR = Result.getComplexFloatReal(); | |||
14245 | APFloat &ResI = Result.getComplexFloatImag(); | |||
14246 | if (LHSReal) { | |||
14247 | assert(!RHSReal && "Cannot have two real operands for a complex op!")(static_cast <bool> (!RHSReal && "Cannot have two real operands for a complex op!" ) ? void (0) : __assert_fail ("!RHSReal && \"Cannot have two real operands for a complex op!\"" , "clang/lib/AST/ExprConstant.cpp", 14247, __extension__ __PRETTY_FUNCTION__ )); | |||
14248 | ResR = A * C; | |||
14249 | ResI = A * D; | |||
14250 | } else if (RHSReal) { | |||
14251 | ResR = C * A; | |||
14252 | ResI = C * B; | |||
14253 | } else { | |||
14254 | // In the fully general case, we need to handle NaNs and infinities | |||
14255 | // robustly. | |||
14256 | APFloat AC = A * C; | |||
14257 | APFloat BD = B * D; | |||
14258 | APFloat AD = A * D; | |||
14259 | APFloat BC = B * C; | |||
14260 | ResR = AC - BD; | |||
14261 | ResI = AD + BC; | |||
14262 | if (ResR.isNaN() && ResI.isNaN()) { | |||
14263 | bool Recalc = false; | |||
14264 | if (A.isInfinity() || B.isInfinity()) { | |||
14265 | A = APFloat::copySign( | |||
14266 | APFloat(A.getSemantics(), A.isInfinity() ? 1 : 0), A); | |||
14267 | B = APFloat::copySign( | |||
14268 | APFloat(B.getSemantics(), B.isInfinity() ? 1 : 0), B); | |||
14269 | if (C.isNaN()) | |||
14270 | C = APFloat::copySign(APFloat(C.getSemantics()), C); | |||
14271 | if (D.isNaN()) | |||
14272 | D = APFloat::copySign(APFloat(D.getSemantics()), D); | |||
14273 | Recalc = true; | |||
14274 | } | |||
14275 | if (C.isInfinity() || D.isInfinity()) { | |||
14276 | C = APFloat::copySign( | |||
14277 | APFloat(C.getSemantics(), C.isInfinity() ? 1 : 0), C); | |||
14278 | D = APFloat::copySign( | |||
14279 | APFloat(D.getSemantics(), D.isInfinity() ? 1 : 0), D); | |||
14280 | if (A.isNaN()) | |||
14281 | A = APFloat::copySign(APFloat(A.getSemantics()), A); | |||
14282 | if (B.isNaN()) | |||
14283 | B = APFloat::copySign(APFloat(B.getSemantics()), B); | |||
14284 | Recalc = true; | |||
14285 | } | |||
14286 | if (!Recalc && (AC.isInfinity() || BD.isInfinity() || | |||
14287 | AD.isInfinity() || BC.isInfinity())) { | |||
14288 | if (A.isNaN()) | |||
14289 | A = APFloat::copySign(APFloat(A.getSemantics()), A); | |||
14290 | if (B.isNaN()) | |||
14291 | B = APFloat::copySign(APFloat(B.getSemantics()), B); | |||
14292 | if (C.isNaN()) | |||
14293 | C = APFloat::copySign(APFloat(C.getSemantics()), C); | |||
14294 | if (D.isNaN()) | |||
14295 | D = APFloat::copySign(APFloat(D.getSemantics()), D); | |||
14296 | Recalc = true; | |||
14297 | } | |||
14298 | if (Recalc) { | |||
14299 | ResR = APFloat::getInf(A.getSemantics()) * (A * C - B * D); | |||
14300 | ResI = APFloat::getInf(A.getSemantics()) * (A * D + B * C); | |||
14301 | } | |||
14302 | } | |||
14303 | } | |||
14304 | } else { | |||
14305 | ComplexValue LHS = Result; | |||
14306 | Result.getComplexIntReal() = | |||
14307 | (LHS.getComplexIntReal() * RHS.getComplexIntReal() - | |||
14308 | LHS.getComplexIntImag() * RHS.getComplexIntImag()); | |||
14309 | Result.getComplexIntImag() = | |||
14310 | (LHS.getComplexIntReal() * RHS.getComplexIntImag() + | |||
14311 | LHS.getComplexIntImag() * RHS.getComplexIntReal()); | |||
14312 | } | |||
14313 | break; | |||
14314 | case BO_Div: | |||
14315 | if (Result.isComplexFloat()) { | |||
14316 | // This is an implementation of complex division according to the | |||
14317 | // constraints laid out in C11 Annex G. The implementation uses the | |||
14318 | // following naming scheme: | |||
14319 | // (a + ib) / (c + id) | |||
14320 | ComplexValue LHS = Result; | |||
14321 | APFloat &A = LHS.getComplexFloatReal(); | |||
14322 | APFloat &B = LHS.getComplexFloatImag(); | |||
14323 | APFloat &C = RHS.getComplexFloatReal(); | |||
14324 | APFloat &D = RHS.getComplexFloatImag(); | |||
14325 | APFloat &ResR = Result.getComplexFloatReal(); | |||
14326 | APFloat &ResI = Result.getComplexFloatImag(); | |||
14327 | if (RHSReal) { | |||
14328 | ResR = A / C; | |||
14329 | ResI = B / C; | |||
14330 | } else { | |||
14331 | if (LHSReal) { | |||
14332 | // No real optimizations we can do here, stub out with zero. | |||
14333 | B = APFloat::getZero(A.getSemantics()); | |||
14334 | } | |||
14335 | int DenomLogB = 0; | |||
14336 | APFloat MaxCD = maxnum(abs(C), abs(D)); | |||
14337 | if (MaxCD.isFinite()) { | |||
14338 | DenomLogB = ilogb(MaxCD); | |||
14339 | C = scalbn(C, -DenomLogB, APFloat::rmNearestTiesToEven); | |||
14340 | D = scalbn(D, -DenomLogB, APFloat::rmNearestTiesToEven); | |||
14341 | } | |||
14342 | APFloat Denom = C * C + D * D; | |||
14343 | ResR = scalbn((A * C + B * D) / Denom, -DenomLogB, | |||
14344 | APFloat::rmNearestTiesToEven); | |||
14345 | ResI = scalbn((B * C - A * D) / Denom, -DenomLogB, | |||
14346 | APFloat::rmNearestTiesToEven); | |||
14347 | if (ResR.isNaN() && ResI.isNaN()) { | |||
14348 | if (Denom.isPosZero() && (!A.isNaN() || !B.isNaN())) { | |||
14349 | ResR = APFloat::getInf(ResR.getSemantics(), C.isNegative()) * A; | |||
14350 | ResI = APFloat::getInf(ResR.getSemantics(), C.isNegative()) * B; | |||
14351 | } else if ((A.isInfinity() || B.isInfinity()) && C.isFinite() && | |||
14352 | D.isFinite()) { | |||
14353 | A = APFloat::copySign( | |||
14354 | APFloat(A.getSemantics(), A.isInfinity() ? 1 : 0), A); | |||
14355 | B = APFloat::copySign( | |||
14356 | APFloat(B.getSemantics(), B.isInfinity() ? 1 : 0), B); | |||
14357 | ResR = APFloat::getInf(ResR.getSemantics()) * (A * C + B * D); | |||
14358 | ResI = APFloat::getInf(ResI.getSemantics()) * (B * C - A * D); | |||
14359 | } else if (MaxCD.isInfinity() && A.isFinite() && B.isFinite()) { | |||
14360 | C = APFloat::copySign( | |||
14361 | APFloat(C.getSemantics(), C.isInfinity() ? 1 : 0), C); | |||
14362 | D = APFloat::copySign( | |||
14363 | APFloat(D.getSemantics(), D.isInfinity() ? 1 : 0), D); | |||
14364 | ResR = APFloat::getZero(ResR.getSemantics()) * (A * C + B * D); | |||
14365 | ResI = APFloat::getZero(ResI.getSemantics()) * (B * C - A * D); | |||
14366 | } | |||
14367 | } | |||
14368 | } | |||
14369 | } else { | |||
14370 | if (RHS.getComplexIntReal() == 0 && RHS.getComplexIntImag() == 0) | |||
14371 | return Error(E, diag::note_expr_divide_by_zero); | |||
14372 | ||||
14373 | ComplexValue LHS = Result; | |||
14374 | APSInt Den = RHS.getComplexIntReal() * RHS.getComplexIntReal() + | |||
14375 | RHS.getComplexIntImag() * RHS.getComplexIntImag(); | |||
14376 | Result.getComplexIntReal() = | |||
14377 | (LHS.getComplexIntReal() * RHS.getComplexIntReal() + | |||
14378 | LHS.getComplexIntImag() * RHS.getComplexIntImag()) / Den; | |||
14379 | Result.getComplexIntImag() = | |||
14380 | (LHS.getComplexIntImag() * RHS.getComplexIntReal() - | |||
14381 | LHS.getComplexIntReal() * RHS.getComplexIntImag()) / Den; | |||
14382 | } | |||
14383 | break; | |||
14384 | } | |||
14385 | ||||
14386 | return true; | |||
14387 | } | |||
14388 | ||||
14389 | bool ComplexExprEvaluator::VisitUnaryOperator(const UnaryOperator *E) { | |||
14390 | // Get the operand value into 'Result'. | |||
14391 | if (!Visit(E->getSubExpr())) | |||
14392 | return false; | |||
14393 | ||||
14394 | switch (E->getOpcode()) { | |||
14395 | default: | |||
14396 | return Error(E); | |||
14397 | case UO_Extension: | |||
14398 | return true; | |||
14399 | case UO_Plus: | |||
14400 | // The result is always just the subexpr. | |||
14401 | return true; | |||
14402 | case UO_Minus: | |||
14403 | if (Result.isComplexFloat()) { | |||
14404 | Result.getComplexFloatReal().changeSign(); | |||
14405 | Result.getComplexFloatImag().changeSign(); | |||
14406 | } | |||
14407 | else { | |||
14408 | Result.getComplexIntReal() = -Result.getComplexIntReal(); | |||
14409 | Result.getComplexIntImag() = -Result.getComplexIntImag(); | |||
14410 | } | |||
14411 | return true; | |||
14412 | case UO_Not: | |||
14413 | if (Result.isComplexFloat()) | |||
14414 | Result.getComplexFloatImag().changeSign(); | |||
14415 | else | |||
14416 | Result.getComplexIntImag() = -Result.getComplexIntImag(); | |||
14417 | return true; | |||
14418 | } | |||
14419 | } | |||
14420 | ||||
14421 | bool ComplexExprEvaluator::VisitInitListExpr(const InitListExpr *E) { | |||
14422 | if (E->getNumInits() == 2) { | |||
14423 | if (E->getType()->isComplexType()) { | |||
14424 | Result.makeComplexFloat(); | |||
14425 | if (!EvaluateFloat(E->getInit(0), Result.FloatReal, Info)) | |||
14426 | return false; | |||
14427 | if (!EvaluateFloat(E->getInit(1), Result.FloatImag, Info)) | |||
14428 | return false; | |||
14429 | } else { | |||
14430 | Result.makeComplexInt(); | |||
14431 | if (!EvaluateInteger(E->getInit(0), Result.IntReal, Info)) | |||
14432 | return false; | |||
14433 | if (!EvaluateInteger(E->getInit(1), Result.IntImag, Info)) | |||
14434 | return false; | |||
14435 | } | |||
14436 | return true; | |||
14437 | } | |||
14438 | return ExprEvaluatorBaseTy::VisitInitListExpr(E); | |||
14439 | } | |||
14440 | ||||
14441 | bool ComplexExprEvaluator::VisitCallExpr(const CallExpr *E) { | |||
14442 | switch (E->getBuiltinCallee()) { | |||
14443 | case Builtin::BI__builtin_complex: | |||
14444 | Result.makeComplexFloat(); | |||
14445 | if (!EvaluateFloat(E->getArg(0), Result.FloatReal, Info)) | |||
14446 | return false; | |||
14447 | if (!EvaluateFloat(E->getArg(1), Result.FloatImag, Info)) | |||
14448 | return false; | |||
14449 | return true; | |||
14450 | ||||
14451 | default: | |||
14452 | break; | |||
14453 | } | |||
14454 | ||||
14455 | return ExprEvaluatorBaseTy::VisitCallExpr(E); | |||
14456 | } | |||
14457 | ||||
14458 | //===----------------------------------------------------------------------===// | |||
14459 | // Atomic expression evaluation, essentially just handling the NonAtomicToAtomic | |||
14460 | // implicit conversion. | |||
14461 | //===----------------------------------------------------------------------===// | |||
14462 | ||||
14463 | namespace { | |||
14464 | class AtomicExprEvaluator : | |||
14465 | public ExprEvaluatorBase<AtomicExprEvaluator> { | |||
14466 | const LValue *This; | |||
14467 | APValue &Result; | |||
14468 | public: | |||
14469 | AtomicExprEvaluator(EvalInfo &Info, const LValue *This, APValue &Result) | |||
14470 | : ExprEvaluatorBaseTy(Info), This(This), Result(Result) {} | |||
14471 | ||||
14472 | bool Success(const APValue &V, const Expr *E) { | |||
14473 | Result = V; | |||
14474 | return true; | |||
14475 | } | |||
14476 | ||||
14477 | bool ZeroInitialization(const Expr *E) { | |||
14478 | ImplicitValueInitExpr VIE( | |||
14479 | E->getType()->castAs<AtomicType>()->getValueType()); | |||
14480 | // For atomic-qualified class (and array) types in C++, initialize the | |||
14481 | // _Atomic-wrapped subobject directly, in-place. | |||
14482 | return This ? EvaluateInPlace(Result, Info, *This, &VIE) | |||
14483 | : Evaluate(Result, Info, &VIE); | |||
14484 | } | |||
14485 | ||||
14486 | bool VisitCastExpr(const CastExpr *E) { | |||
14487 | switch (E->getCastKind()) { | |||
14488 | default: | |||
14489 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
14490 | case CK_NonAtomicToAtomic: | |||
14491 | return This ? EvaluateInPlace(Result, Info, *This, E->getSubExpr()) | |||
14492 | : Evaluate(Result, Info, E->getSubExpr()); | |||
14493 | } | |||
14494 | } | |||
14495 | }; | |||
14496 | } // end anonymous namespace | |||
14497 | ||||
14498 | static bool EvaluateAtomic(const Expr *E, const LValue *This, APValue &Result, | |||
14499 | EvalInfo &Info) { | |||
14500 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 14500, __extension__ __PRETTY_FUNCTION__)); | |||
14501 | assert(E->isPRValue() && E->getType()->isAtomicType())(static_cast <bool> (E->isPRValue() && E-> getType()->isAtomicType()) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isAtomicType()" , "clang/lib/AST/ExprConstant.cpp", 14501, __extension__ __PRETTY_FUNCTION__ )); | |||
14502 | return AtomicExprEvaluator(Info, This, Result).Visit(E); | |||
14503 | } | |||
14504 | ||||
14505 | //===----------------------------------------------------------------------===// | |||
14506 | // Void expression evaluation, primarily for a cast to void on the LHS of a | |||
14507 | // comma operator | |||
14508 | //===----------------------------------------------------------------------===// | |||
14509 | ||||
14510 | namespace { | |||
14511 | class VoidExprEvaluator | |||
14512 | : public ExprEvaluatorBase<VoidExprEvaluator> { | |||
14513 | public: | |||
14514 | VoidExprEvaluator(EvalInfo &Info) : ExprEvaluatorBaseTy(Info) {} | |||
14515 | ||||
14516 | bool Success(const APValue &V, const Expr *e) { return true; } | |||
14517 | ||||
14518 | bool ZeroInitialization(const Expr *E) { return true; } | |||
14519 | ||||
14520 | bool VisitCastExpr(const CastExpr *E) { | |||
14521 | switch (E->getCastKind()) { | |||
14522 | default: | |||
14523 | return ExprEvaluatorBaseTy::VisitCastExpr(E); | |||
14524 | case CK_ToVoid: | |||
14525 | VisitIgnoredValue(E->getSubExpr()); | |||
14526 | return true; | |||
14527 | } | |||
14528 | } | |||
14529 | ||||
14530 | bool VisitCallExpr(const CallExpr *E) { | |||
14531 | switch (E->getBuiltinCallee()) { | |||
14532 | case Builtin::BI__assume: | |||
14533 | case Builtin::BI__builtin_assume: | |||
14534 | // The argument is not evaluated! | |||
14535 | return true; | |||
14536 | ||||
14537 | case Builtin::BI__builtin_operator_delete: | |||
14538 | return HandleOperatorDeleteCall(Info, E); | |||
14539 | ||||
14540 | default: | |||
14541 | break; | |||
14542 | } | |||
14543 | ||||
14544 | return ExprEvaluatorBaseTy::VisitCallExpr(E); | |||
14545 | } | |||
14546 | ||||
14547 | bool VisitCXXDeleteExpr(const CXXDeleteExpr *E); | |||
14548 | }; | |||
14549 | } // end anonymous namespace | |||
14550 | ||||
14551 | bool VoidExprEvaluator::VisitCXXDeleteExpr(const CXXDeleteExpr *E) { | |||
14552 | // We cannot speculatively evaluate a delete expression. | |||
14553 | if (Info.SpeculativeEvaluationDepth) | |||
14554 | return false; | |||
14555 | ||||
14556 | FunctionDecl *OperatorDelete = E->getOperatorDelete(); | |||
14557 | if (!OperatorDelete->isReplaceableGlobalAllocationFunction()) { | |||
14558 | Info.FFDiag(E, diag::note_constexpr_new_non_replaceable) | |||
14559 | << isa<CXXMethodDecl>(OperatorDelete) << OperatorDelete; | |||
14560 | return false; | |||
14561 | } | |||
14562 | ||||
14563 | const Expr *Arg = E->getArgument(); | |||
14564 | ||||
14565 | LValue Pointer; | |||
14566 | if (!EvaluatePointer(Arg, Pointer, Info)) | |||
14567 | return false; | |||
14568 | if (Pointer.Designator.Invalid) | |||
14569 | return false; | |||
14570 | ||||
14571 | // Deleting a null pointer has no effect. | |||
14572 | if (Pointer.isNullPointer()) { | |||
14573 | // This is the only case where we need to produce an extension warning: | |||
14574 | // the only other way we can succeed is if we find a dynamic allocation, | |||
14575 | // and we will have warned when we allocated it in that case. | |||
14576 | if (!Info.getLangOpts().CPlusPlus20) | |||
14577 | Info.CCEDiag(E, diag::note_constexpr_new); | |||
14578 | return true; | |||
14579 | } | |||
14580 | ||||
14581 | Optional<DynAlloc *> Alloc = CheckDeleteKind( | |||
14582 | Info, E, Pointer, E->isArrayForm() ? DynAlloc::ArrayNew : DynAlloc::New); | |||
14583 | if (!Alloc) | |||
14584 | return false; | |||
14585 | QualType AllocType = Pointer.Base.getDynamicAllocType(); | |||
14586 | ||||
14587 | // For the non-array case, the designator must be empty if the static type | |||
14588 | // does not have a virtual destructor. | |||
14589 | if (!E->isArrayForm() && Pointer.Designator.Entries.size() != 0 && | |||
14590 | !hasVirtualDestructor(Arg->getType()->getPointeeType())) { | |||
14591 | Info.FFDiag(E, diag::note_constexpr_delete_base_nonvirt_dtor) | |||
14592 | << Arg->getType()->getPointeeType() << AllocType; | |||
14593 | return false; | |||
14594 | } | |||
14595 | ||||
14596 | // For a class type with a virtual destructor, the selected operator delete | |||
14597 | // is the one looked up when building the destructor. | |||
14598 | if (!E->isArrayForm() && !E->isGlobalDelete()) { | |||
14599 | const FunctionDecl *VirtualDelete = getVirtualOperatorDelete(AllocType); | |||
14600 | if (VirtualDelete && | |||
14601 | !VirtualDelete->isReplaceableGlobalAllocationFunction()) { | |||
14602 | Info.FFDiag(E, diag::note_constexpr_new_non_replaceable) | |||
14603 | << isa<CXXMethodDecl>(VirtualDelete) << VirtualDelete; | |||
14604 | return false; | |||
14605 | } | |||
14606 | } | |||
14607 | ||||
14608 | if (!HandleDestruction(Info, E->getExprLoc(), Pointer.getLValueBase(), | |||
14609 | (*Alloc)->Value, AllocType)) | |||
14610 | return false; | |||
14611 | ||||
14612 | if (!Info.HeapAllocs.erase(Pointer.Base.dyn_cast<DynamicAllocLValue>())) { | |||
14613 | // The element was already erased. This means the destructor call also | |||
14614 | // deleted the object. | |||
14615 | // FIXME: This probably results in undefined behavior before we get this | |||
14616 | // far, and should be diagnosed elsewhere first. | |||
14617 | Info.FFDiag(E, diag::note_constexpr_double_delete); | |||
14618 | return false; | |||
14619 | } | |||
14620 | ||||
14621 | return true; | |||
14622 | } | |||
14623 | ||||
14624 | static bool EvaluateVoid(const Expr *E, EvalInfo &Info) { | |||
14625 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 14625, __extension__ __PRETTY_FUNCTION__)); | |||
14626 | assert(E->isPRValue() && E->getType()->isVoidType())(static_cast <bool> (E->isPRValue() && E-> getType()->isVoidType()) ? void (0) : __assert_fail ("E->isPRValue() && E->getType()->isVoidType()" , "clang/lib/AST/ExprConstant.cpp", 14626, __extension__ __PRETTY_FUNCTION__ )); | |||
14627 | return VoidExprEvaluator(Info).Visit(E); | |||
14628 | } | |||
14629 | ||||
14630 | //===----------------------------------------------------------------------===// | |||
14631 | // Top level Expr::EvaluateAsRValue method. | |||
14632 | //===----------------------------------------------------------------------===// | |||
14633 | ||||
14634 | static bool Evaluate(APValue &Result, EvalInfo &Info, const Expr *E) { | |||
14635 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 14635, __extension__ __PRETTY_FUNCTION__)); | |||
14636 | // In C, function designators are not lvalues, but we evaluate them as if they | |||
14637 | // are. | |||
14638 | QualType T = E->getType(); | |||
14639 | if (E->isGLValue() || T->isFunctionType()) { | |||
14640 | LValue LV; | |||
14641 | if (!EvaluateLValue(E, LV, Info)) | |||
14642 | return false; | |||
14643 | LV.moveInto(Result); | |||
14644 | } else if (T->isVectorType()) { | |||
14645 | if (!EvaluateVector(E, Result, Info)) | |||
14646 | return false; | |||
14647 | } else if (T->isIntegralOrEnumerationType()) { | |||
14648 | if (!IntExprEvaluator(Info, Result).Visit(E)) | |||
14649 | return false; | |||
14650 | } else if (T->hasPointerRepresentation()) { | |||
14651 | LValue LV; | |||
14652 | if (!EvaluatePointer(E, LV, Info)) | |||
14653 | return false; | |||
14654 | LV.moveInto(Result); | |||
14655 | } else if (T->isRealFloatingType()) { | |||
14656 | llvm::APFloat F(0.0); | |||
14657 | if (!EvaluateFloat(E, F, Info)) | |||
14658 | return false; | |||
14659 | Result = APValue(F); | |||
14660 | } else if (T->isAnyComplexType()) { | |||
14661 | ComplexValue C; | |||
14662 | if (!EvaluateComplex(E, C, Info)) | |||
14663 | return false; | |||
14664 | C.moveInto(Result); | |||
14665 | } else if (T->isFixedPointType()) { | |||
14666 | if (!FixedPointExprEvaluator(Info, Result).Visit(E)) return false; | |||
14667 | } else if (T->isMemberPointerType()) { | |||
14668 | MemberPtr P; | |||
14669 | if (!EvaluateMemberPointer(E, P, Info)) | |||
14670 | return false; | |||
14671 | P.moveInto(Result); | |||
14672 | return true; | |||
14673 | } else if (T->isArrayType()) { | |||
14674 | LValue LV; | |||
14675 | APValue &Value = | |||
14676 | Info.CurrentCall->createTemporary(E, T, ScopeKind::FullExpression, LV); | |||
14677 | if (!EvaluateArray(E, LV, Value, Info)) | |||
14678 | return false; | |||
14679 | Result = Value; | |||
14680 | } else if (T->isRecordType()) { | |||
14681 | LValue LV; | |||
14682 | APValue &Value = | |||
14683 | Info.CurrentCall->createTemporary(E, T, ScopeKind::FullExpression, LV); | |||
14684 | if (!EvaluateRecord(E, LV, Value, Info)) | |||
14685 | return false; | |||
14686 | Result = Value; | |||
14687 | } else if (T->isVoidType()) { | |||
14688 | if (!Info.getLangOpts().CPlusPlus11) | |||
14689 | Info.CCEDiag(E, diag::note_constexpr_nonliteral) | |||
14690 | << E->getType(); | |||
14691 | if (!EvaluateVoid(E, Info)) | |||
14692 | return false; | |||
14693 | } else if (T->isAtomicType()) { | |||
14694 | QualType Unqual = T.getAtomicUnqualifiedType(); | |||
14695 | if (Unqual->isArrayType() || Unqual->isRecordType()) { | |||
14696 | LValue LV; | |||
14697 | APValue &Value = Info.CurrentCall->createTemporary( | |||
14698 | E, Unqual, ScopeKind::FullExpression, LV); | |||
14699 | if (!EvaluateAtomic(E, &LV, Value, Info)) | |||
14700 | return false; | |||
14701 | } else { | |||
14702 | if (!EvaluateAtomic(E, nullptr, Result, Info)) | |||
14703 | return false; | |||
14704 | } | |||
14705 | } else if (Info.getLangOpts().CPlusPlus11) { | |||
14706 | Info.FFDiag(E, diag::note_constexpr_nonliteral) << E->getType(); | |||
14707 | return false; | |||
14708 | } else { | |||
14709 | Info.FFDiag(E, diag::note_invalid_subexpr_in_const_expr); | |||
14710 | return false; | |||
14711 | } | |||
14712 | ||||
14713 | return true; | |||
14714 | } | |||
14715 | ||||
14716 | /// EvaluateInPlace - Evaluate an expression in-place in an APValue. In some | |||
14717 | /// cases, the in-place evaluation is essential, since later initializers for | |||
14718 | /// an object can indirectly refer to subobjects which were initialized earlier. | |||
14719 | static bool EvaluateInPlace(APValue &Result, EvalInfo &Info, const LValue &This, | |||
14720 | const Expr *E, bool AllowNonLiteralTypes) { | |||
14721 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 14721, __extension__ __PRETTY_FUNCTION__)); | |||
14722 | ||||
14723 | if (!AllowNonLiteralTypes && !CheckLiteralType(Info, E, &This)) | |||
14724 | return false; | |||
14725 | ||||
14726 | if (E->isPRValue()) { | |||
14727 | // Evaluate arrays and record types in-place, so that later initializers can | |||
14728 | // refer to earlier-initialized members of the object. | |||
14729 | QualType T = E->getType(); | |||
14730 | if (T->isArrayType()) | |||
14731 | return EvaluateArray(E, This, Result, Info); | |||
14732 | else if (T->isRecordType()) | |||
14733 | return EvaluateRecord(E, This, Result, Info); | |||
14734 | else if (T->isAtomicType()) { | |||
14735 | QualType Unqual = T.getAtomicUnqualifiedType(); | |||
14736 | if (Unqual->isArrayType() || Unqual->isRecordType()) | |||
14737 | return EvaluateAtomic(E, &This, Result, Info); | |||
14738 | } | |||
14739 | } | |||
14740 | ||||
14741 | // For any other type, in-place evaluation is unimportant. | |||
14742 | return Evaluate(Result, Info, E); | |||
14743 | } | |||
14744 | ||||
14745 | /// EvaluateAsRValue - Try to evaluate this expression, performing an implicit | |||
14746 | /// lvalue-to-rvalue cast if it is an lvalue. | |||
14747 | static bool EvaluateAsRValue(EvalInfo &Info, const Expr *E, APValue &Result) { | |||
14748 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 14748, __extension__ __PRETTY_FUNCTION__)); | |||
14749 | if (Info.EnableNewConstInterp) { | |||
14750 | if (!Info.Ctx.getInterpContext().evaluateAsRValue(Info, E, Result)) | |||
14751 | return false; | |||
14752 | } else { | |||
14753 | if (E->getType().isNull()) | |||
14754 | return false; | |||
14755 | ||||
14756 | if (!CheckLiteralType(Info, E)) | |||
14757 | return false; | |||
14758 | ||||
14759 | if (!::Evaluate(Result, Info, E)) | |||
14760 | return false; | |||
14761 | ||||
14762 | if (E->isGLValue()) { | |||
14763 | LValue LV; | |||
14764 | LV.setFrom(Info.Ctx, Result); | |||
14765 | if (!handleLValueToRValueConversion(Info, E, E->getType(), LV, Result)) | |||
14766 | return false; | |||
14767 | } | |||
14768 | } | |||
14769 | ||||
14770 | // Check this core constant expression is a constant expression. | |||
14771 | return CheckConstantExpression(Info, E->getExprLoc(), E->getType(), Result, | |||
14772 | ConstantExprKind::Normal) && | |||
14773 | CheckMemoryLeaks(Info); | |||
14774 | } | |||
14775 | ||||
14776 | static bool FastEvaluateAsRValue(const Expr *Exp, Expr::EvalResult &Result, | |||
14777 | const ASTContext &Ctx, bool &IsConst) { | |||
14778 | // Fast-path evaluations of integer literals, since we sometimes see files | |||
14779 | // containing vast quantities of these. | |||
14780 | if (const IntegerLiteral *L = dyn_cast<IntegerLiteral>(Exp)) { | |||
14781 | Result.Val = APValue(APSInt(L->getValue(), | |||
14782 | L->getType()->isUnsignedIntegerType())); | |||
14783 | IsConst = true; | |||
14784 | return true; | |||
14785 | } | |||
14786 | ||||
14787 | // This case should be rare, but we need to check it before we check on | |||
14788 | // the type below. | |||
14789 | if (Exp->getType().isNull()) { | |||
14790 | IsConst = false; | |||
14791 | return true; | |||
14792 | } | |||
14793 | ||||
14794 | // FIXME: Evaluating values of large array and record types can cause | |||
14795 | // performance problems. Only do so in C++11 for now. | |||
14796 | if (Exp->isPRValue() && | |||
14797 | (Exp->getType()->isArrayType() || Exp->getType()->isRecordType()) && | |||
14798 | !Ctx.getLangOpts().CPlusPlus11) { | |||
14799 | IsConst = false; | |||
14800 | return true; | |||
14801 | } | |||
14802 | return false; | |||
14803 | } | |||
14804 | ||||
14805 | static bool hasUnacceptableSideEffect(Expr::EvalStatus &Result, | |||
14806 | Expr::SideEffectsKind SEK) { | |||
14807 | return (SEK < Expr::SE_AllowSideEffects && Result.HasSideEffects) || | |||
14808 | (SEK < Expr::SE_AllowUndefinedBehavior && Result.HasUndefinedBehavior); | |||
14809 | } | |||
14810 | ||||
14811 | static bool EvaluateAsRValue(const Expr *E, Expr::EvalResult &Result, | |||
14812 | const ASTContext &Ctx, EvalInfo &Info) { | |||
14813 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 14813, __extension__ __PRETTY_FUNCTION__)); | |||
14814 | bool IsConst; | |||
14815 | if (FastEvaluateAsRValue(E, Result, Ctx, IsConst)) | |||
14816 | return IsConst; | |||
14817 | ||||
14818 | return EvaluateAsRValue(Info, E, Result.Val); | |||
14819 | } | |||
14820 | ||||
14821 | static bool EvaluateAsInt(const Expr *E, Expr::EvalResult &ExprResult, | |||
14822 | const ASTContext &Ctx, | |||
14823 | Expr::SideEffectsKind AllowSideEffects, | |||
14824 | EvalInfo &Info) { | |||
14825 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 14825, __extension__ __PRETTY_FUNCTION__)); | |||
14826 | if (!E->getType()->isIntegralOrEnumerationType()) | |||
14827 | return false; | |||
14828 | ||||
14829 | if (!::EvaluateAsRValue(E, ExprResult, Ctx, Info) || | |||
14830 | !ExprResult.Val.isInt() || | |||
14831 | hasUnacceptableSideEffect(ExprResult, AllowSideEffects)) | |||
14832 | return false; | |||
14833 | ||||
14834 | return true; | |||
14835 | } | |||
14836 | ||||
14837 | static bool EvaluateAsFixedPoint(const Expr *E, Expr::EvalResult &ExprResult, | |||
14838 | const ASTContext &Ctx, | |||
14839 | Expr::SideEffectsKind AllowSideEffects, | |||
14840 | EvalInfo &Info) { | |||
14841 | assert(!E->isValueDependent())(static_cast <bool> (!E->isValueDependent()) ? void ( 0) : __assert_fail ("!E->isValueDependent()", "clang/lib/AST/ExprConstant.cpp" , 14841, __extension__ __PRETTY_FUNCTION__)); | |||
14842 | if (!E->getType()->isFixedPointType()) | |||
14843 | return false; | |||
14844 | ||||
14845 | if (!::EvaluateAsRValue(E, ExprResult, Ctx, Info)) | |||
14846 | return false; | |||
14847 | ||||
14848 | if (!ExprResult.Val.isFixedPoint() || | |||
14849 | hasUnacceptableSideEffect(ExprResult, AllowSideEffects)) | |||
14850 | return false; | |||
14851 | ||||
14852 | return true; | |||
14853 | } | |||
14854 | ||||
14855 | /// EvaluateAsRValue - Return true if this is a constant which we can fold using | |||
14856 | /// any crazy technique (that has nothing to do with language standards) that | |||
14857 | /// we want to. If this function returns true, it returns the folded constant | |||
14858 | /// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion | |||
14859 | /// will be applied to the result. | |||
14860 | bool Expr::EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx, | |||
14861 | bool InConstantContext) const { | |||
14862 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14863, __extension__ __PRETTY_FUNCTION__ )) | |||
14863 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14863, __extension__ __PRETTY_FUNCTION__ )); | |||
14864 | EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects); | |||
14865 | Info.InConstantContext = InConstantContext; | |||
14866 | return ::EvaluateAsRValue(this, Result, Ctx, Info); | |||
14867 | } | |||
14868 | ||||
14869 | bool Expr::EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx, | |||
14870 | bool InConstantContext) const { | |||
14871 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14872, __extension__ __PRETTY_FUNCTION__ )) | |||
14872 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14872, __extension__ __PRETTY_FUNCTION__ )); | |||
14873 | EvalResult Scratch; | |||
14874 | return EvaluateAsRValue(Scratch, Ctx, InConstantContext) && | |||
14875 | HandleConversionToBool(Scratch.Val, Result); | |||
14876 | } | |||
14877 | ||||
14878 | bool Expr::EvaluateAsInt(EvalResult &Result, const ASTContext &Ctx, | |||
14879 | SideEffectsKind AllowSideEffects, | |||
14880 | bool InConstantContext) const { | |||
14881 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14882, __extension__ __PRETTY_FUNCTION__ )) | |||
14882 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14882, __extension__ __PRETTY_FUNCTION__ )); | |||
14883 | EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects); | |||
14884 | Info.InConstantContext = InConstantContext; | |||
14885 | return ::EvaluateAsInt(this, Result, Ctx, AllowSideEffects, Info); | |||
14886 | } | |||
14887 | ||||
14888 | bool Expr::EvaluateAsFixedPoint(EvalResult &Result, const ASTContext &Ctx, | |||
14889 | SideEffectsKind AllowSideEffects, | |||
14890 | bool InConstantContext) const { | |||
14891 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14892, __extension__ __PRETTY_FUNCTION__ )) | |||
14892 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14892, __extension__ __PRETTY_FUNCTION__ )); | |||
14893 | EvalInfo Info(Ctx, Result, EvalInfo::EM_IgnoreSideEffects); | |||
14894 | Info.InConstantContext = InConstantContext; | |||
14895 | return ::EvaluateAsFixedPoint(this, Result, Ctx, AllowSideEffects, Info); | |||
14896 | } | |||
14897 | ||||
14898 | bool Expr::EvaluateAsFloat(APFloat &Result, const ASTContext &Ctx, | |||
14899 | SideEffectsKind AllowSideEffects, | |||
14900 | bool InConstantContext) const { | |||
14901 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14902, __extension__ __PRETTY_FUNCTION__ )) | |||
14902 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14902, __extension__ __PRETTY_FUNCTION__ )); | |||
14903 | ||||
14904 | if (!getType()->isRealFloatingType()) | |||
14905 | return false; | |||
14906 | ||||
14907 | EvalResult ExprResult; | |||
14908 | if (!EvaluateAsRValue(ExprResult, Ctx, InConstantContext) || | |||
14909 | !ExprResult.Val.isFloat() || | |||
14910 | hasUnacceptableSideEffect(ExprResult, AllowSideEffects)) | |||
14911 | return false; | |||
14912 | ||||
14913 | Result = ExprResult.Val.getFloat(); | |||
14914 | return true; | |||
14915 | } | |||
14916 | ||||
14917 | bool Expr::EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx, | |||
14918 | bool InConstantContext) const { | |||
14919 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14920, __extension__ __PRETTY_FUNCTION__ )) | |||
14920 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14920, __extension__ __PRETTY_FUNCTION__ )); | |||
14921 | ||||
14922 | EvalInfo Info(Ctx, Result, EvalInfo::EM_ConstantFold); | |||
14923 | Info.InConstantContext = InConstantContext; | |||
14924 | LValue LV; | |||
14925 | CheckedTemporaries CheckedTemps; | |||
14926 | if (!EvaluateLValue(this, LV, Info) || !Info.discardCleanups() || | |||
14927 | Result.HasSideEffects || | |||
14928 | !CheckLValueConstantExpression(Info, getExprLoc(), | |||
14929 | Ctx.getLValueReferenceType(getType()), LV, | |||
14930 | ConstantExprKind::Normal, CheckedTemps)) | |||
14931 | return false; | |||
14932 | ||||
14933 | LV.moveInto(Result.Val); | |||
14934 | return true; | |||
14935 | } | |||
14936 | ||||
14937 | static bool EvaluateDestruction(const ASTContext &Ctx, APValue::LValueBase Base, | |||
14938 | APValue DestroyedValue, QualType Type, | |||
14939 | SourceLocation Loc, Expr::EvalStatus &EStatus, | |||
14940 | bool IsConstantDestruction) { | |||
14941 | EvalInfo Info(Ctx, EStatus, | |||
14942 | IsConstantDestruction ? EvalInfo::EM_ConstantExpression | |||
14943 | : EvalInfo::EM_ConstantFold); | |||
14944 | Info.setEvaluatingDecl(Base, DestroyedValue, | |||
14945 | EvalInfo::EvaluatingDeclKind::Dtor); | |||
14946 | Info.InConstantContext = IsConstantDestruction; | |||
14947 | ||||
14948 | LValue LVal; | |||
14949 | LVal.set(Base); | |||
14950 | ||||
14951 | if (!HandleDestruction(Info, Loc, Base, DestroyedValue, Type) || | |||
14952 | EStatus.HasSideEffects) | |||
14953 | return false; | |||
14954 | ||||
14955 | if (!Info.discardCleanups()) | |||
14956 | llvm_unreachable("Unhandled cleanup; missing full expression marker?")::llvm::llvm_unreachable_internal("Unhandled cleanup; missing full expression marker?" , "clang/lib/AST/ExprConstant.cpp", 14956); | |||
14957 | ||||
14958 | return true; | |||
14959 | } | |||
14960 | ||||
14961 | bool Expr::EvaluateAsConstantExpr(EvalResult &Result, const ASTContext &Ctx, | |||
14962 | ConstantExprKind Kind) const { | |||
14963 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14964, __extension__ __PRETTY_FUNCTION__ )) | |||
14964 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 14964, __extension__ __PRETTY_FUNCTION__ )); | |||
14965 | ||||
14966 | EvalInfo::EvaluationMode EM = EvalInfo::EM_ConstantExpression; | |||
14967 | EvalInfo Info(Ctx, Result, EM); | |||
14968 | Info.InConstantContext = true; | |||
14969 | ||||
14970 | // The type of the object we're initializing is 'const T' for a class NTTP. | |||
14971 | QualType T = getType(); | |||
14972 | if (Kind == ConstantExprKind::ClassTemplateArgument) | |||
14973 | T.addConst(); | |||
14974 | ||||
14975 | // If we're evaluating a prvalue, fake up a MaterializeTemporaryExpr to | |||
14976 | // represent the result of the evaluation. CheckConstantExpression ensures | |||
14977 | // this doesn't escape. | |||
14978 | MaterializeTemporaryExpr BaseMTE(T, const_cast<Expr*>(this), true); | |||
14979 | APValue::LValueBase Base(&BaseMTE); | |||
14980 | ||||
14981 | Info.setEvaluatingDecl(Base, Result.Val); | |||
14982 | LValue LVal; | |||
14983 | LVal.set(Base); | |||
14984 | ||||
14985 | if (!::EvaluateInPlace(Result.Val, Info, LVal, this) || Result.HasSideEffects) | |||
14986 | return false; | |||
14987 | ||||
14988 | if (!Info.discardCleanups()) | |||
14989 | llvm_unreachable("Unhandled cleanup; missing full expression marker?")::llvm::llvm_unreachable_internal("Unhandled cleanup; missing full expression marker?" , "clang/lib/AST/ExprConstant.cpp", 14989); | |||
14990 | ||||
14991 | if (!CheckConstantExpression(Info, getExprLoc(), getStorageType(Ctx, this), | |||
14992 | Result.Val, Kind)) | |||
14993 | return false; | |||
14994 | if (!CheckMemoryLeaks(Info)) | |||
14995 | return false; | |||
14996 | ||||
14997 | // If this is a class template argument, it's required to have constant | |||
14998 | // destruction too. | |||
14999 | if (Kind == ConstantExprKind::ClassTemplateArgument && | |||
15000 | (!EvaluateDestruction(Ctx, Base, Result.Val, T, getBeginLoc(), Result, | |||
15001 | true) || | |||
15002 | Result.HasSideEffects)) { | |||
15003 | // FIXME: Prefix a note to indicate that the problem is lack of constant | |||
15004 | // destruction. | |||
15005 | return false; | |||
15006 | } | |||
15007 | ||||
15008 | return true; | |||
15009 | } | |||
15010 | ||||
15011 | bool Expr::EvaluateAsInitializer(APValue &Value, const ASTContext &Ctx, | |||
15012 | const VarDecl *VD, | |||
15013 | SmallVectorImpl<PartialDiagnosticAt> &Notes, | |||
15014 | bool IsConstantInitialization) const { | |||
15015 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15016, __extension__ __PRETTY_FUNCTION__ )) | |||
15016 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15016, __extension__ __PRETTY_FUNCTION__ )); | |||
15017 | ||||
15018 | // FIXME: Evaluating initializers for large array and record types can cause | |||
15019 | // performance problems. Only do so in C++11 for now. | |||
15020 | if (isPRValue() && (getType()->isArrayType() || getType()->isRecordType()) && | |||
15021 | !Ctx.getLangOpts().CPlusPlus11) | |||
15022 | return false; | |||
15023 | ||||
15024 | Expr::EvalStatus EStatus; | |||
15025 | EStatus.Diag = &Notes; | |||
15026 | ||||
15027 | EvalInfo Info(Ctx, EStatus, | |||
15028 | (IsConstantInitialization && Ctx.getLangOpts().CPlusPlus11) | |||
15029 | ? EvalInfo::EM_ConstantExpression | |||
15030 | : EvalInfo::EM_ConstantFold); | |||
15031 | Info.setEvaluatingDecl(VD, Value); | |||
15032 | Info.InConstantContext = IsConstantInitialization; | |||
15033 | ||||
15034 | SourceLocation DeclLoc = VD->getLocation(); | |||
15035 | QualType DeclTy = VD->getType(); | |||
15036 | ||||
15037 | if (Info.EnableNewConstInterp) { | |||
15038 | auto &InterpCtx = const_cast<ASTContext &>(Ctx).getInterpContext(); | |||
15039 | if (!InterpCtx.evaluateAsInitializer(Info, VD, Value)) | |||
15040 | return false; | |||
15041 | } else { | |||
15042 | LValue LVal; | |||
15043 | LVal.set(VD); | |||
15044 | ||||
15045 | if (!EvaluateInPlace(Value, Info, LVal, this, | |||
15046 | /*AllowNonLiteralTypes=*/true) || | |||
15047 | EStatus.HasSideEffects) | |||
15048 | return false; | |||
15049 | ||||
15050 | // At this point, any lifetime-extended temporaries are completely | |||
15051 | // initialized. | |||
15052 | Info.performLifetimeExtension(); | |||
15053 | ||||
15054 | if (!Info.discardCleanups()) | |||
15055 | llvm_unreachable("Unhandled cleanup; missing full expression marker?")::llvm::llvm_unreachable_internal("Unhandled cleanup; missing full expression marker?" , "clang/lib/AST/ExprConstant.cpp", 15055); | |||
15056 | } | |||
15057 | return CheckConstantExpression(Info, DeclLoc, DeclTy, Value, | |||
15058 | ConstantExprKind::Normal) && | |||
15059 | CheckMemoryLeaks(Info); | |||
15060 | } | |||
15061 | ||||
15062 | bool VarDecl::evaluateDestruction( | |||
15063 | SmallVectorImpl<PartialDiagnosticAt> &Notes) const { | |||
15064 | Expr::EvalStatus EStatus; | |||
15065 | EStatus.Diag = &Notes; | |||
15066 | ||||
15067 | // Only treat the destruction as constant destruction if we formally have | |||
15068 | // constant initialization (or are usable in a constant expression). | |||
15069 | bool IsConstantDestruction = hasConstantInitialization(); | |||
15070 | ||||
15071 | // Make a copy of the value for the destructor to mutate, if we know it. | |||
15072 | // Otherwise, treat the value as default-initialized; if the destructor works | |||
15073 | // anyway, then the destruction is constant (and must be essentially empty). | |||
15074 | APValue DestroyedValue; | |||
15075 | if (getEvaluatedValue() && !getEvaluatedValue()->isAbsent()) | |||
15076 | DestroyedValue = *getEvaluatedValue(); | |||
15077 | else if (!getDefaultInitValue(getType(), DestroyedValue)) | |||
15078 | return false; | |||
15079 | ||||
15080 | if (!EvaluateDestruction(getASTContext(), this, std::move(DestroyedValue), | |||
15081 | getType(), getLocation(), EStatus, | |||
15082 | IsConstantDestruction) || | |||
15083 | EStatus.HasSideEffects) | |||
15084 | return false; | |||
15085 | ||||
15086 | ensureEvaluatedStmt()->HasConstantDestruction = true; | |||
15087 | return true; | |||
15088 | } | |||
15089 | ||||
15090 | /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be | |||
15091 | /// constant folded, but discard the result. | |||
15092 | bool Expr::isEvaluatable(const ASTContext &Ctx, SideEffectsKind SEK) const { | |||
15093 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15094, __extension__ __PRETTY_FUNCTION__ )) | |||
15094 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15094, __extension__ __PRETTY_FUNCTION__ )); | |||
15095 | ||||
15096 | EvalResult Result; | |||
15097 | return EvaluateAsRValue(Result, Ctx, /* in constant context */ true) && | |||
15098 | !hasUnacceptableSideEffect(Result, SEK); | |||
15099 | } | |||
15100 | ||||
15101 | APSInt Expr::EvaluateKnownConstInt(const ASTContext &Ctx, | |||
15102 | SmallVectorImpl<PartialDiagnosticAt> *Diag) const { | |||
15103 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15104, __extension__ __PRETTY_FUNCTION__ )) | |||
15104 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15104, __extension__ __PRETTY_FUNCTION__ )); | |||
15105 | ||||
15106 | EvalResult EVResult; | |||
15107 | EVResult.Diag = Diag; | |||
15108 | EvalInfo Info(Ctx, EVResult, EvalInfo::EM_IgnoreSideEffects); | |||
15109 | Info.InConstantContext = true; | |||
15110 | ||||
15111 | bool Result = ::EvaluateAsRValue(this, EVResult, Ctx, Info); | |||
15112 | (void)Result; | |||
15113 | assert(Result && "Could not evaluate expression")(static_cast <bool> (Result && "Could not evaluate expression" ) ? void (0) : __assert_fail ("Result && \"Could not evaluate expression\"" , "clang/lib/AST/ExprConstant.cpp", 15113, __extension__ __PRETTY_FUNCTION__ )); | |||
15114 | assert(EVResult.Val.isInt() && "Expression did not evaluate to integer")(static_cast <bool> (EVResult.Val.isInt() && "Expression did not evaluate to integer" ) ? void (0) : __assert_fail ("EVResult.Val.isInt() && \"Expression did not evaluate to integer\"" , "clang/lib/AST/ExprConstant.cpp", 15114, __extension__ __PRETTY_FUNCTION__ )); | |||
15115 | ||||
15116 | return EVResult.Val.getInt(); | |||
15117 | } | |||
15118 | ||||
15119 | APSInt Expr::EvaluateKnownConstIntCheckOverflow( | |||
15120 | const ASTContext &Ctx, SmallVectorImpl<PartialDiagnosticAt> *Diag) const { | |||
15121 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15122, __extension__ __PRETTY_FUNCTION__ )) | |||
15122 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15122, __extension__ __PRETTY_FUNCTION__ )); | |||
15123 | ||||
15124 | EvalResult EVResult; | |||
15125 | EVResult.Diag = Diag; | |||
15126 | EvalInfo Info(Ctx, EVResult, EvalInfo::EM_IgnoreSideEffects); | |||
15127 | Info.InConstantContext = true; | |||
15128 | Info.CheckingForUndefinedBehavior = true; | |||
15129 | ||||
15130 | bool Result = ::EvaluateAsRValue(Info, this, EVResult.Val); | |||
15131 | (void)Result; | |||
15132 | assert(Result && "Could not evaluate expression")(static_cast <bool> (Result && "Could not evaluate expression" ) ? void (0) : __assert_fail ("Result && \"Could not evaluate expression\"" , "clang/lib/AST/ExprConstant.cpp", 15132, __extension__ __PRETTY_FUNCTION__ )); | |||
15133 | assert(EVResult.Val.isInt() && "Expression did not evaluate to integer")(static_cast <bool> (EVResult.Val.isInt() && "Expression did not evaluate to integer" ) ? void (0) : __assert_fail ("EVResult.Val.isInt() && \"Expression did not evaluate to integer\"" , "clang/lib/AST/ExprConstant.cpp", 15133, __extension__ __PRETTY_FUNCTION__ )); | |||
15134 | ||||
15135 | return EVResult.Val.getInt(); | |||
15136 | } | |||
15137 | ||||
15138 | void Expr::EvaluateForOverflow(const ASTContext &Ctx) const { | |||
15139 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15140, __extension__ __PRETTY_FUNCTION__ )) | |||
15140 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15140, __extension__ __PRETTY_FUNCTION__ )); | |||
15141 | ||||
15142 | bool IsConst; | |||
15143 | EvalResult EVResult; | |||
15144 | if (!FastEvaluateAsRValue(this, EVResult, Ctx, IsConst)) { | |||
15145 | EvalInfo Info(Ctx, EVResult, EvalInfo::EM_IgnoreSideEffects); | |||
15146 | Info.CheckingForUndefinedBehavior = true; | |||
15147 | (void)::EvaluateAsRValue(Info, this, EVResult.Val); | |||
15148 | } | |||
15149 | } | |||
15150 | ||||
15151 | bool Expr::EvalResult::isGlobalLValue() const { | |||
15152 | assert(Val.isLValue())(static_cast <bool> (Val.isLValue()) ? void (0) : __assert_fail ("Val.isLValue()", "clang/lib/AST/ExprConstant.cpp", 15152, __extension__ __PRETTY_FUNCTION__)); | |||
15153 | return IsGlobalLValue(Val.getLValueBase()); | |||
15154 | } | |||
15155 | ||||
15156 | /// isIntegerConstantExpr - this recursive routine will test if an expression is | |||
15157 | /// an integer constant expression. | |||
15158 | ||||
15159 | /// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, | |||
15160 | /// comma, etc | |||
15161 | ||||
15162 | // CheckICE - This function does the fundamental ICE checking: the returned | |||
15163 | // ICEDiag contains an ICEKind indicating whether the expression is an ICE, | |||
15164 | // and a (possibly null) SourceLocation indicating the location of the problem. | |||
15165 | // | |||
15166 | // Note that to reduce code duplication, this helper does no evaluation | |||
15167 | // itself; the caller checks whether the expression is evaluatable, and | |||
15168 | // in the rare cases where CheckICE actually cares about the evaluated | |||
15169 | // value, it calls into Evaluate. | |||
15170 | ||||
15171 | namespace { | |||
15172 | ||||
15173 | enum ICEKind { | |||
15174 | /// This expression is an ICE. | |||
15175 | IK_ICE, | |||
15176 | /// This expression is not an ICE, but if it isn't evaluated, it's | |||
15177 | /// a legal subexpression for an ICE. This return value is used to handle | |||
15178 | /// the comma operator in C99 mode, and non-constant subexpressions. | |||
15179 | IK_ICEIfUnevaluated, | |||
15180 | /// This expression is not an ICE, and is not a legal subexpression for one. | |||
15181 | IK_NotICE | |||
15182 | }; | |||
15183 | ||||
15184 | struct ICEDiag { | |||
15185 | ICEKind Kind; | |||
15186 | SourceLocation Loc; | |||
15187 | ||||
15188 | ICEDiag(ICEKind IK, SourceLocation l) : Kind(IK), Loc(l) {} | |||
15189 | }; | |||
15190 | ||||
15191 | } | |||
15192 | ||||
15193 | static ICEDiag NoDiag() { return ICEDiag(IK_ICE, SourceLocation()); } | |||
15194 | ||||
15195 | static ICEDiag Worst(ICEDiag A, ICEDiag B) { return A.Kind >= B.Kind ? A : B; } | |||
15196 | ||||
15197 | static ICEDiag CheckEvalInICE(const Expr* E, const ASTContext &Ctx) { | |||
15198 | Expr::EvalResult EVResult; | |||
15199 | Expr::EvalStatus Status; | |||
15200 | EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpression); | |||
15201 | ||||
15202 | Info.InConstantContext = true; | |||
15203 | if (!::EvaluateAsRValue(E, EVResult, Ctx, Info) || EVResult.HasSideEffects || | |||
15204 | !EVResult.Val.isInt()) | |||
15205 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15206 | ||||
15207 | return NoDiag(); | |||
15208 | } | |||
15209 | ||||
15210 | static ICEDiag CheckICE(const Expr* E, const ASTContext &Ctx) { | |||
15211 | assert(!E->isValueDependent() && "Should not see value dependent exprs!")(static_cast <bool> (!E->isValueDependent() && "Should not see value dependent exprs!") ? void (0) : __assert_fail ("!E->isValueDependent() && \"Should not see value dependent exprs!\"" , "clang/lib/AST/ExprConstant.cpp", 15211, __extension__ __PRETTY_FUNCTION__ )); | |||
15212 | if (!E->getType()->isIntegralOrEnumerationType()) | |||
15213 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15214 | ||||
15215 | switch (E->getStmtClass()) { | |||
15216 | #define ABSTRACT_STMT(Node) | |||
15217 | #define STMT(Node, Base) case Expr::Node##Class: | |||
15218 | #define EXPR(Node, Base) | |||
15219 | #include "clang/AST/StmtNodes.inc" | |||
15220 | case Expr::PredefinedExprClass: | |||
15221 | case Expr::FloatingLiteralClass: | |||
15222 | case Expr::ImaginaryLiteralClass: | |||
15223 | case Expr::StringLiteralClass: | |||
15224 | case Expr::ArraySubscriptExprClass: | |||
15225 | case Expr::MatrixSubscriptExprClass: | |||
15226 | case Expr::OMPArraySectionExprClass: | |||
15227 | case Expr::OMPArrayShapingExprClass: | |||
15228 | case Expr::OMPIteratorExprClass: | |||
15229 | case Expr::MemberExprClass: | |||
15230 | case Expr::CompoundAssignOperatorClass: | |||
15231 | case Expr::CompoundLiteralExprClass: | |||
15232 | case Expr::ExtVectorElementExprClass: | |||
15233 | case Expr::DesignatedInitExprClass: | |||
15234 | case Expr::ArrayInitLoopExprClass: | |||
15235 | case Expr::ArrayInitIndexExprClass: | |||
15236 | case Expr::NoInitExprClass: | |||
15237 | case Expr::DesignatedInitUpdateExprClass: | |||
15238 | case Expr::ImplicitValueInitExprClass: | |||
15239 | case Expr::ParenListExprClass: | |||
15240 | case Expr::VAArgExprClass: | |||
15241 | case Expr::AddrLabelExprClass: | |||
15242 | case Expr::StmtExprClass: | |||
15243 | case Expr::CXXMemberCallExprClass: | |||
15244 | case Expr::CUDAKernelCallExprClass: | |||
15245 | case Expr::CXXAddrspaceCastExprClass: | |||
15246 | case Expr::CXXDynamicCastExprClass: | |||
15247 | case Expr::CXXTypeidExprClass: | |||
15248 | case Expr::CXXUuidofExprClass: | |||
15249 | case Expr::MSPropertyRefExprClass: | |||
15250 | case Expr::MSPropertySubscriptExprClass: | |||
15251 | case Expr::CXXNullPtrLiteralExprClass: | |||
15252 | case Expr::UserDefinedLiteralClass: | |||
15253 | case Expr::CXXThisExprClass: | |||
15254 | case Expr::CXXThrowExprClass: | |||
15255 | case Expr::CXXNewExprClass: | |||
15256 | case Expr::CXXDeleteExprClass: | |||
15257 | case Expr::CXXPseudoDestructorExprClass: | |||
15258 | case Expr::UnresolvedLookupExprClass: | |||
15259 | case Expr::TypoExprClass: | |||
15260 | case Expr::RecoveryExprClass: | |||
15261 | case Expr::DependentScopeDeclRefExprClass: | |||
15262 | case Expr::CXXConstructExprClass: | |||
15263 | case Expr::CXXInheritedCtorInitExprClass: | |||
15264 | case Expr::CXXStdInitializerListExprClass: | |||
15265 | case Expr::CXXBindTemporaryExprClass: | |||
15266 | case Expr::ExprWithCleanupsClass: | |||
15267 | case Expr::CXXTemporaryObjectExprClass: | |||
15268 | case Expr::CXXUnresolvedConstructExprClass: | |||
15269 | case Expr::CXXDependentScopeMemberExprClass: | |||
15270 | case Expr::UnresolvedMemberExprClass: | |||
15271 | case Expr::ObjCStringLiteralClass: | |||
15272 | case Expr::ObjCBoxedExprClass: | |||
15273 | case Expr::ObjCArrayLiteralClass: | |||
15274 | case Expr::ObjCDictionaryLiteralClass: | |||
15275 | case Expr::ObjCEncodeExprClass: | |||
15276 | case Expr::ObjCMessageExprClass: | |||
15277 | case Expr::ObjCSelectorExprClass: | |||
15278 | case Expr::ObjCProtocolExprClass: | |||
15279 | case Expr::ObjCIvarRefExprClass: | |||
15280 | case Expr::ObjCPropertyRefExprClass: | |||
15281 | case Expr::ObjCSubscriptRefExprClass: | |||
15282 | case Expr::ObjCIsaExprClass: | |||
15283 | case Expr::ObjCAvailabilityCheckExprClass: | |||
15284 | case Expr::ShuffleVectorExprClass: | |||
15285 | case Expr::ConvertVectorExprClass: | |||
15286 | case Expr::BlockExprClass: | |||
15287 | case Expr::NoStmtClass: | |||
15288 | case Expr::OpaqueValueExprClass: | |||
15289 | case Expr::PackExpansionExprClass: | |||
15290 | case Expr::SubstNonTypeTemplateParmPackExprClass: | |||
15291 | case Expr::FunctionParmPackExprClass: | |||
15292 | case Expr::AsTypeExprClass: | |||
15293 | case Expr::ObjCIndirectCopyRestoreExprClass: | |||
15294 | case Expr::MaterializeTemporaryExprClass: | |||
15295 | case Expr::PseudoObjectExprClass: | |||
15296 | case Expr::AtomicExprClass: | |||
15297 | case Expr::LambdaExprClass: | |||
15298 | case Expr::CXXFoldExprClass: | |||
15299 | case Expr::CoawaitExprClass: | |||
15300 | case Expr::DependentCoawaitExprClass: | |||
15301 | case Expr::CoyieldExprClass: | |||
15302 | case Expr::SYCLUniqueStableNameExprClass: | |||
15303 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15304 | ||||
15305 | case Expr::InitListExprClass: { | |||
15306 | // C++03 [dcl.init]p13: If T is a scalar type, then a declaration of the | |||
15307 | // form "T x = { a };" is equivalent to "T x = a;". | |||
15308 | // Unless we're initializing a reference, T is a scalar as it is known to be | |||
15309 | // of integral or enumeration type. | |||
15310 | if (E->isPRValue()) | |||
15311 | if (cast<InitListExpr>(E)->getNumInits() == 1) | |||
15312 | return CheckICE(cast<InitListExpr>(E)->getInit(0), Ctx); | |||
15313 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15314 | } | |||
15315 | ||||
15316 | case Expr::SizeOfPackExprClass: | |||
15317 | case Expr::GNUNullExprClass: | |||
15318 | case Expr::SourceLocExprClass: | |||
15319 | return NoDiag(); | |||
15320 | ||||
15321 | case Expr::SubstNonTypeTemplateParmExprClass: | |||
15322 | return | |||
15323 | CheckICE(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(), Ctx); | |||
15324 | ||||
15325 | case Expr::ConstantExprClass: | |||
15326 | return CheckICE(cast<ConstantExpr>(E)->getSubExpr(), Ctx); | |||
15327 | ||||
15328 | case Expr::ParenExprClass: | |||
15329 | return CheckICE(cast<ParenExpr>(E)->getSubExpr(), Ctx); | |||
15330 | case Expr::GenericSelectionExprClass: | |||
15331 | return CheckICE(cast<GenericSelectionExpr>(E)->getResultExpr(), Ctx); | |||
15332 | case Expr::IntegerLiteralClass: | |||
15333 | case Expr::FixedPointLiteralClass: | |||
15334 | case Expr::CharacterLiteralClass: | |||
15335 | case Expr::ObjCBoolLiteralExprClass: | |||
15336 | case Expr::CXXBoolLiteralExprClass: | |||
15337 | case Expr::CXXScalarValueInitExprClass: | |||
15338 | case Expr::TypeTraitExprClass: | |||
15339 | case Expr::ConceptSpecializationExprClass: | |||
15340 | case Expr::RequiresExprClass: | |||
15341 | case Expr::ArrayTypeTraitExprClass: | |||
15342 | case Expr::ExpressionTraitExprClass: | |||
15343 | case Expr::CXXNoexceptExprClass: | |||
15344 | return NoDiag(); | |||
15345 | case Expr::CallExprClass: | |||
15346 | case Expr::CXXOperatorCallExprClass: { | |||
15347 | // C99 6.6/3 allows function calls within unevaluated subexpressions of | |||
15348 | // constant expressions, but they can never be ICEs because an ICE cannot | |||
15349 | // contain an operand of (pointer to) function type. | |||
15350 | const CallExpr *CE = cast<CallExpr>(E); | |||
15351 | if (CE->getBuiltinCallee()) | |||
15352 | return CheckEvalInICE(E, Ctx); | |||
15353 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15354 | } | |||
15355 | case Expr::CXXRewrittenBinaryOperatorClass: | |||
15356 | return CheckICE(cast<CXXRewrittenBinaryOperator>(E)->getSemanticForm(), | |||
15357 | Ctx); | |||
15358 | case Expr::DeclRefExprClass: { | |||
15359 | const NamedDecl *D = cast<DeclRefExpr>(E)->getDecl(); | |||
15360 | if (isa<EnumConstantDecl>(D)) | |||
15361 | return NoDiag(); | |||
15362 | ||||
15363 | // C++ and OpenCL (FIXME: spec reference?) allow reading const-qualified | |||
15364 | // integer variables in constant expressions: | |||
15365 | // | |||
15366 | // C++ 7.1.5.1p2 | |||
15367 | // A variable of non-volatile const-qualified integral or enumeration | |||
15368 | // type initialized by an ICE can be used in ICEs. | |||
15369 | // | |||
15370 | // We sometimes use CheckICE to check the C++98 rules in C++11 mode. In | |||
15371 | // that mode, use of reference variables should not be allowed. | |||
15372 | const VarDecl *VD = dyn_cast<VarDecl>(D); | |||
15373 | if (VD && VD->isUsableInConstantExpressions(Ctx) && | |||
15374 | !VD->getType()->isReferenceType()) | |||
15375 | return NoDiag(); | |||
15376 | ||||
15377 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15378 | } | |||
15379 | case Expr::UnaryOperatorClass: { | |||
15380 | const UnaryOperator *Exp = cast<UnaryOperator>(E); | |||
15381 | switch (Exp->getOpcode()) { | |||
15382 | case UO_PostInc: | |||
15383 | case UO_PostDec: | |||
15384 | case UO_PreInc: | |||
15385 | case UO_PreDec: | |||
15386 | case UO_AddrOf: | |||
15387 | case UO_Deref: | |||
15388 | case UO_Coawait: | |||
15389 | // C99 6.6/3 allows increment and decrement within unevaluated | |||
15390 | // subexpressions of constant expressions, but they can never be ICEs | |||
15391 | // because an ICE cannot contain an lvalue operand. | |||
15392 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15393 | case UO_Extension: | |||
15394 | case UO_LNot: | |||
15395 | case UO_Plus: | |||
15396 | case UO_Minus: | |||
15397 | case UO_Not: | |||
15398 | case UO_Real: | |||
15399 | case UO_Imag: | |||
15400 | return CheckICE(Exp->getSubExpr(), Ctx); | |||
15401 | } | |||
15402 | llvm_unreachable("invalid unary operator class")::llvm::llvm_unreachable_internal("invalid unary operator class" , "clang/lib/AST/ExprConstant.cpp", 15402); | |||
15403 | } | |||
15404 | case Expr::OffsetOfExprClass: { | |||
15405 | // Note that per C99, offsetof must be an ICE. And AFAIK, using | |||
15406 | // EvaluateAsRValue matches the proposed gcc behavior for cases like | |||
15407 | // "offsetof(struct s{int x[4];}, x[1.0])". This doesn't affect | |||
15408 | // compliance: we should warn earlier for offsetof expressions with | |||
15409 | // array subscripts that aren't ICEs, and if the array subscripts | |||
15410 | // are ICEs, the value of the offsetof must be an integer constant. | |||
15411 | return CheckEvalInICE(E, Ctx); | |||
15412 | } | |||
15413 | case Expr::UnaryExprOrTypeTraitExprClass: { | |||
15414 | const UnaryExprOrTypeTraitExpr *Exp = cast<UnaryExprOrTypeTraitExpr>(E); | |||
15415 | if ((Exp->getKind() == UETT_SizeOf) && | |||
15416 | Exp->getTypeOfArgument()->isVariableArrayType()) | |||
15417 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15418 | return NoDiag(); | |||
15419 | } | |||
15420 | case Expr::BinaryOperatorClass: { | |||
15421 | const BinaryOperator *Exp = cast<BinaryOperator>(E); | |||
15422 | switch (Exp->getOpcode()) { | |||
15423 | case BO_PtrMemD: | |||
15424 | case BO_PtrMemI: | |||
15425 | case BO_Assign: | |||
15426 | case BO_MulAssign: | |||
15427 | case BO_DivAssign: | |||
15428 | case BO_RemAssign: | |||
15429 | case BO_AddAssign: | |||
15430 | case BO_SubAssign: | |||
15431 | case BO_ShlAssign: | |||
15432 | case BO_ShrAssign: | |||
15433 | case BO_AndAssign: | |||
15434 | case BO_XorAssign: | |||
15435 | case BO_OrAssign: | |||
15436 | // C99 6.6/3 allows assignments within unevaluated subexpressions of | |||
15437 | // constant expressions, but they can never be ICEs because an ICE cannot | |||
15438 | // contain an lvalue operand. | |||
15439 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15440 | ||||
15441 | case BO_Mul: | |||
15442 | case BO_Div: | |||
15443 | case BO_Rem: | |||
15444 | case BO_Add: | |||
15445 | case BO_Sub: | |||
15446 | case BO_Shl: | |||
15447 | case BO_Shr: | |||
15448 | case BO_LT: | |||
15449 | case BO_GT: | |||
15450 | case BO_LE: | |||
15451 | case BO_GE: | |||
15452 | case BO_EQ: | |||
15453 | case BO_NE: | |||
15454 | case BO_And: | |||
15455 | case BO_Xor: | |||
15456 | case BO_Or: | |||
15457 | case BO_Comma: | |||
15458 | case BO_Cmp: { | |||
15459 | ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); | |||
15460 | ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); | |||
15461 | if (Exp->getOpcode() == BO_Div || | |||
15462 | Exp->getOpcode() == BO_Rem) { | |||
15463 | // EvaluateAsRValue gives an error for undefined Div/Rem, so make sure | |||
15464 | // we don't evaluate one. | |||
15465 | if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICE) { | |||
15466 | llvm::APSInt REval = Exp->getRHS()->EvaluateKnownConstInt(Ctx); | |||
15467 | if (REval == 0) | |||
15468 | return ICEDiag(IK_ICEIfUnevaluated, E->getBeginLoc()); | |||
15469 | if (REval.isSigned() && REval.isAllOnes()) { | |||
15470 | llvm::APSInt LEval = Exp->getLHS()->EvaluateKnownConstInt(Ctx); | |||
15471 | if (LEval.isMinSignedValue()) | |||
15472 | return ICEDiag(IK_ICEIfUnevaluated, E->getBeginLoc()); | |||
15473 | } | |||
15474 | } | |||
15475 | } | |||
15476 | if (Exp->getOpcode() == BO_Comma) { | |||
15477 | if (Ctx.getLangOpts().C99) { | |||
15478 | // C99 6.6p3 introduces a strange edge case: comma can be in an ICE | |||
15479 | // if it isn't evaluated. | |||
15480 | if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICE) | |||
15481 | return ICEDiag(IK_ICEIfUnevaluated, E->getBeginLoc()); | |||
15482 | } else { | |||
15483 | // In both C89 and C++, commas in ICEs are illegal. | |||
15484 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15485 | } | |||
15486 | } | |||
15487 | return Worst(LHSResult, RHSResult); | |||
15488 | } | |||
15489 | case BO_LAnd: | |||
15490 | case BO_LOr: { | |||
15491 | ICEDiag LHSResult = CheckICE(Exp->getLHS(), Ctx); | |||
15492 | ICEDiag RHSResult = CheckICE(Exp->getRHS(), Ctx); | |||
15493 | if (LHSResult.Kind == IK_ICE && RHSResult.Kind == IK_ICEIfUnevaluated) { | |||
15494 | // Rare case where the RHS has a comma "side-effect"; we need | |||
15495 | // to actually check the condition to see whether the side | |||
15496 | // with the comma is evaluated. | |||
15497 | if ((Exp->getOpcode() == BO_LAnd) != | |||
15498 | (Exp->getLHS()->EvaluateKnownConstInt(Ctx) == 0)) | |||
15499 | return RHSResult; | |||
15500 | return NoDiag(); | |||
15501 | } | |||
15502 | ||||
15503 | return Worst(LHSResult, RHSResult); | |||
15504 | } | |||
15505 | } | |||
15506 | llvm_unreachable("invalid binary operator kind")::llvm::llvm_unreachable_internal("invalid binary operator kind" , "clang/lib/AST/ExprConstant.cpp", 15506); | |||
15507 | } | |||
15508 | case Expr::ImplicitCastExprClass: | |||
15509 | case Expr::CStyleCastExprClass: | |||
15510 | case Expr::CXXFunctionalCastExprClass: | |||
15511 | case Expr::CXXStaticCastExprClass: | |||
15512 | case Expr::CXXReinterpretCastExprClass: | |||
15513 | case Expr::CXXConstCastExprClass: | |||
15514 | case Expr::ObjCBridgedCastExprClass: { | |||
15515 | const Expr *SubExpr = cast<CastExpr>(E)->getSubExpr(); | |||
15516 | if (isa<ExplicitCastExpr>(E)) { | |||
15517 | if (const FloatingLiteral *FL | |||
15518 | = dyn_cast<FloatingLiteral>(SubExpr->IgnoreParenImpCasts())) { | |||
15519 | unsigned DestWidth = Ctx.getIntWidth(E->getType()); | |||
15520 | bool DestSigned = E->getType()->isSignedIntegerOrEnumerationType(); | |||
15521 | APSInt IgnoredVal(DestWidth, !DestSigned); | |||
15522 | bool Ignored; | |||
15523 | // If the value does not fit in the destination type, the behavior is | |||
15524 | // undefined, so we are not required to treat it as a constant | |||
15525 | // expression. | |||
15526 | if (FL->getValue().convertToInteger(IgnoredVal, | |||
15527 | llvm::APFloat::rmTowardZero, | |||
15528 | &Ignored) & APFloat::opInvalidOp) | |||
15529 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15530 | return NoDiag(); | |||
15531 | } | |||
15532 | } | |||
15533 | switch (cast<CastExpr>(E)->getCastKind()) { | |||
15534 | case CK_LValueToRValue: | |||
15535 | case CK_AtomicToNonAtomic: | |||
15536 | case CK_NonAtomicToAtomic: | |||
15537 | case CK_NoOp: | |||
15538 | case CK_IntegralToBoolean: | |||
15539 | case CK_IntegralCast: | |||
15540 | return CheckICE(SubExpr, Ctx); | |||
15541 | default: | |||
15542 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15543 | } | |||
15544 | } | |||
15545 | case Expr::BinaryConditionalOperatorClass: { | |||
15546 | const BinaryConditionalOperator *Exp = cast<BinaryConditionalOperator>(E); | |||
15547 | ICEDiag CommonResult = CheckICE(Exp->getCommon(), Ctx); | |||
15548 | if (CommonResult.Kind == IK_NotICE) return CommonResult; | |||
15549 | ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); | |||
15550 | if (FalseResult.Kind == IK_NotICE) return FalseResult; | |||
15551 | if (CommonResult.Kind == IK_ICEIfUnevaluated) return CommonResult; | |||
15552 | if (FalseResult.Kind == IK_ICEIfUnevaluated && | |||
15553 | Exp->getCommon()->EvaluateKnownConstInt(Ctx) != 0) return NoDiag(); | |||
15554 | return FalseResult; | |||
15555 | } | |||
15556 | case Expr::ConditionalOperatorClass: { | |||
15557 | const ConditionalOperator *Exp = cast<ConditionalOperator>(E); | |||
15558 | // If the condition (ignoring parens) is a __builtin_constant_p call, | |||
15559 | // then only the true side is actually considered in an integer constant | |||
15560 | // expression, and it is fully evaluated. This is an important GNU | |||
15561 | // extension. See GCC PR38377 for discussion. | |||
15562 | if (const CallExpr *CallCE | |||
15563 | = dyn_cast<CallExpr>(Exp->getCond()->IgnoreParenCasts())) | |||
15564 | if (CallCE->getBuiltinCallee() == Builtin::BI__builtin_constant_p) | |||
15565 | return CheckEvalInICE(E, Ctx); | |||
15566 | ICEDiag CondResult = CheckICE(Exp->getCond(), Ctx); | |||
15567 | if (CondResult.Kind == IK_NotICE) | |||
15568 | return CondResult; | |||
15569 | ||||
15570 | ICEDiag TrueResult = CheckICE(Exp->getTrueExpr(), Ctx); | |||
15571 | ICEDiag FalseResult = CheckICE(Exp->getFalseExpr(), Ctx); | |||
15572 | ||||
15573 | if (TrueResult.Kind == IK_NotICE) | |||
15574 | return TrueResult; | |||
15575 | if (FalseResult.Kind == IK_NotICE) | |||
15576 | return FalseResult; | |||
15577 | if (CondResult.Kind == IK_ICEIfUnevaluated) | |||
15578 | return CondResult; | |||
15579 | if (TrueResult.Kind == IK_ICE && FalseResult.Kind == IK_ICE) | |||
15580 | return NoDiag(); | |||
15581 | // Rare case where the diagnostics depend on which side is evaluated | |||
15582 | // Note that if we get here, CondResult is 0, and at least one of | |||
15583 | // TrueResult and FalseResult is non-zero. | |||
15584 | if (Exp->getCond()->EvaluateKnownConstInt(Ctx) == 0) | |||
15585 | return FalseResult; | |||
15586 | return TrueResult; | |||
15587 | } | |||
15588 | case Expr::CXXDefaultArgExprClass: | |||
15589 | return CheckICE(cast<CXXDefaultArgExpr>(E)->getExpr(), Ctx); | |||
15590 | case Expr::CXXDefaultInitExprClass: | |||
15591 | return CheckICE(cast<CXXDefaultInitExpr>(E)->getExpr(), Ctx); | |||
15592 | case Expr::ChooseExprClass: { | |||
15593 | return CheckICE(cast<ChooseExpr>(E)->getChosenSubExpr(), Ctx); | |||
15594 | } | |||
15595 | case Expr::BuiltinBitCastExprClass: { | |||
15596 | if (!checkBitCastConstexprEligibility(nullptr, Ctx, cast<CastExpr>(E))) | |||
15597 | return ICEDiag(IK_NotICE, E->getBeginLoc()); | |||
15598 | return CheckICE(cast<CastExpr>(E)->getSubExpr(), Ctx); | |||
15599 | } | |||
15600 | } | |||
15601 | ||||
15602 | llvm_unreachable("Invalid StmtClass!")::llvm::llvm_unreachable_internal("Invalid StmtClass!", "clang/lib/AST/ExprConstant.cpp" , 15602); | |||
15603 | } | |||
15604 | ||||
15605 | /// Evaluate an expression as a C++11 integral constant expression. | |||
15606 | static bool EvaluateCPlusPlus11IntegralConstantExpr(const ASTContext &Ctx, | |||
15607 | const Expr *E, | |||
15608 | llvm::APSInt *Value, | |||
15609 | SourceLocation *Loc) { | |||
15610 | if (!E->getType()->isIntegralOrUnscopedEnumerationType()) { | |||
15611 | if (Loc) *Loc = E->getExprLoc(); | |||
15612 | return false; | |||
15613 | } | |||
15614 | ||||
15615 | APValue Result; | |||
15616 | if (!E->isCXX11ConstantExpr(Ctx, &Result, Loc)) | |||
15617 | return false; | |||
15618 | ||||
15619 | if (!Result.isInt()) { | |||
15620 | if (Loc) *Loc = E->getExprLoc(); | |||
15621 | return false; | |||
15622 | } | |||
15623 | ||||
15624 | if (Value) *Value = Result.getInt(); | |||
15625 | return true; | |||
15626 | } | |||
15627 | ||||
15628 | bool Expr::isIntegerConstantExpr(const ASTContext &Ctx, | |||
15629 | SourceLocation *Loc) const { | |||
15630 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15631, __extension__ __PRETTY_FUNCTION__ )) | |||
15631 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15631, __extension__ __PRETTY_FUNCTION__ )); | |||
15632 | ||||
15633 | if (Ctx.getLangOpts().CPlusPlus11) | |||
15634 | return EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, nullptr, Loc); | |||
15635 | ||||
15636 | ICEDiag D = CheckICE(this, Ctx); | |||
15637 | if (D.Kind != IK_ICE) { | |||
15638 | if (Loc) *Loc = D.Loc; | |||
15639 | return false; | |||
15640 | } | |||
15641 | return true; | |||
15642 | } | |||
15643 | ||||
15644 | Optional<llvm::APSInt> Expr::getIntegerConstantExpr(const ASTContext &Ctx, | |||
15645 | SourceLocation *Loc, | |||
15646 | bool isEvaluated) const { | |||
15647 | if (isValueDependent()) { | |||
15648 | // Expression evaluator can't succeed on a dependent expression. | |||
15649 | return None; | |||
15650 | } | |||
15651 | ||||
15652 | APSInt Value; | |||
15653 | ||||
15654 | if (Ctx.getLangOpts().CPlusPlus11) { | |||
15655 | if (EvaluateCPlusPlus11IntegralConstantExpr(Ctx, this, &Value, Loc)) | |||
15656 | return Value; | |||
15657 | return None; | |||
15658 | } | |||
15659 | ||||
15660 | if (!isIntegerConstantExpr(Ctx, Loc)) | |||
15661 | return None; | |||
15662 | ||||
15663 | // The only possible side-effects here are due to UB discovered in the | |||
15664 | // evaluation (for instance, INT_MAX + 1). In such a case, we are still | |||
15665 | // required to treat the expression as an ICE, so we produce the folded | |||
15666 | // value. | |||
15667 | EvalResult ExprResult; | |||
15668 | Expr::EvalStatus Status; | |||
15669 | EvalInfo Info(Ctx, Status, EvalInfo::EM_IgnoreSideEffects); | |||
15670 | Info.InConstantContext = true; | |||
15671 | ||||
15672 | if (!::EvaluateAsInt(this, ExprResult, Ctx, SE_AllowSideEffects, Info)) | |||
15673 | llvm_unreachable("ICE cannot be evaluated!")::llvm::llvm_unreachable_internal("ICE cannot be evaluated!", "clang/lib/AST/ExprConstant.cpp", 15673); | |||
15674 | ||||
15675 | return ExprResult.Val.getInt(); | |||
15676 | } | |||
15677 | ||||
15678 | bool Expr::isCXX98IntegralConstantExpr(const ASTContext &Ctx) const { | |||
15679 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15680, __extension__ __PRETTY_FUNCTION__ )) | |||
15680 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15680, __extension__ __PRETTY_FUNCTION__ )); | |||
15681 | ||||
15682 | return CheckICE(this, Ctx).Kind == IK_ICE; | |||
15683 | } | |||
15684 | ||||
15685 | bool Expr::isCXX11ConstantExpr(const ASTContext &Ctx, APValue *Result, | |||
15686 | SourceLocation *Loc) const { | |||
15687 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15688, __extension__ __PRETTY_FUNCTION__ )) | |||
15688 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15688, __extension__ __PRETTY_FUNCTION__ )); | |||
15689 | ||||
15690 | // We support this checking in C++98 mode in order to diagnose compatibility | |||
15691 | // issues. | |||
15692 | assert(Ctx.getLangOpts().CPlusPlus)(static_cast <bool> (Ctx.getLangOpts().CPlusPlus) ? void (0) : __assert_fail ("Ctx.getLangOpts().CPlusPlus", "clang/lib/AST/ExprConstant.cpp" , 15692, __extension__ __PRETTY_FUNCTION__)); | |||
15693 | ||||
15694 | // Build evaluation settings. | |||
15695 | Expr::EvalStatus Status; | |||
15696 | SmallVector<PartialDiagnosticAt, 8> Diags; | |||
15697 | Status.Diag = &Diags; | |||
15698 | EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpression); | |||
15699 | ||||
15700 | APValue Scratch; | |||
15701 | bool IsConstExpr = | |||
15702 | ::EvaluateAsRValue(Info, this, Result ? *Result : Scratch) && | |||
15703 | // FIXME: We don't produce a diagnostic for this, but the callers that | |||
15704 | // call us on arbitrary full-expressions should generally not care. | |||
15705 | Info.discardCleanups() && !Status.HasSideEffects; | |||
15706 | ||||
15707 | if (!Diags.empty()) { | |||
15708 | IsConstExpr = false; | |||
15709 | if (Loc) *Loc = Diags[0].first; | |||
15710 | } else if (!IsConstExpr) { | |||
15711 | // FIXME: This shouldn't happen. | |||
15712 | if (Loc) *Loc = getExprLoc(); | |||
15713 | } | |||
15714 | ||||
15715 | return IsConstExpr; | |||
15716 | } | |||
15717 | ||||
15718 | bool Expr::EvaluateWithSubstitution(APValue &Value, ASTContext &Ctx, | |||
15719 | const FunctionDecl *Callee, | |||
15720 | ArrayRef<const Expr*> Args, | |||
15721 | const Expr *This) const { | |||
15722 | assert(!isValueDependent() &&(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15723, __extension__ __PRETTY_FUNCTION__ )) | |||
15723 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15723, __extension__ __PRETTY_FUNCTION__ )); | |||
15724 | ||||
15725 | Expr::EvalStatus Status; | |||
15726 | EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantExpressionUnevaluated); | |||
15727 | Info.InConstantContext = true; | |||
15728 | ||||
15729 | LValue ThisVal; | |||
15730 | const LValue *ThisPtr = nullptr; | |||
15731 | if (This) { | |||
15732 | #ifndef NDEBUG | |||
15733 | auto *MD = dyn_cast<CXXMethodDecl>(Callee); | |||
15734 | assert(MD && "Don't provide `this` for non-methods.")(static_cast <bool> (MD && "Don't provide `this` for non-methods." ) ? void (0) : __assert_fail ("MD && \"Don't provide `this` for non-methods.\"" , "clang/lib/AST/ExprConstant.cpp", 15734, __extension__ __PRETTY_FUNCTION__ )); | |||
15735 | assert(!MD->isStatic() && "Don't provide `this` for static methods.")(static_cast <bool> (!MD->isStatic() && "Don't provide `this` for static methods." ) ? void (0) : __assert_fail ("!MD->isStatic() && \"Don't provide `this` for static methods.\"" , "clang/lib/AST/ExprConstant.cpp", 15735, __extension__ __PRETTY_FUNCTION__ )); | |||
15736 | #endif | |||
15737 | if (!This->isValueDependent() && | |||
15738 | EvaluateObjectArgument(Info, This, ThisVal) && | |||
15739 | !Info.EvalStatus.HasSideEffects) | |||
15740 | ThisPtr = &ThisVal; | |||
15741 | ||||
15742 | // Ignore any side-effects from a failed evaluation. This is safe because | |||
15743 | // they can't interfere with any other argument evaluation. | |||
15744 | Info.EvalStatus.HasSideEffects = false; | |||
15745 | } | |||
15746 | ||||
15747 | CallRef Call = Info.CurrentCall->createCall(Callee); | |||
15748 | for (ArrayRef<const Expr*>::iterator I = Args.begin(), E = Args.end(); | |||
15749 | I != E; ++I) { | |||
15750 | unsigned Idx = I - Args.begin(); | |||
15751 | if (Idx >= Callee->getNumParams()) | |||
15752 | break; | |||
15753 | const ParmVarDecl *PVD = Callee->getParamDecl(Idx); | |||
15754 | if ((*I)->isValueDependent() || | |||
15755 | !EvaluateCallArg(PVD, *I, Call, Info) || | |||
15756 | Info.EvalStatus.HasSideEffects) { | |||
15757 | // If evaluation fails, throw away the argument entirely. | |||
15758 | if (APValue *Slot = Info.getParamSlot(Call, PVD)) | |||
15759 | *Slot = APValue(); | |||
15760 | } | |||
15761 | ||||
15762 | // Ignore any side-effects from a failed evaluation. This is safe because | |||
15763 | // they can't interfere with any other argument evaluation. | |||
15764 | Info.EvalStatus.HasSideEffects = false; | |||
15765 | } | |||
15766 | ||||
15767 | // Parameter cleanups happen in the caller and are not part of this | |||
15768 | // evaluation. | |||
15769 | Info.discardCleanups(); | |||
15770 | Info.EvalStatus.HasSideEffects = false; | |||
15771 | ||||
15772 | // Build fake call to Callee. | |||
15773 | CallStackFrame Frame(Info, Callee->getLocation(), Callee, ThisPtr, Call); | |||
15774 | // FIXME: Missing ExprWithCleanups in enable_if conditions? | |||
15775 | FullExpressionRAII Scope(Info); | |||
15776 | return Evaluate(Value, Info, this) && Scope.destroy() && | |||
15777 | !Info.EvalStatus.HasSideEffects; | |||
15778 | } | |||
15779 | ||||
15780 | bool Expr::isPotentialConstantExpr(const FunctionDecl *FD, | |||
15781 | SmallVectorImpl< | |||
15782 | PartialDiagnosticAt> &Diags) { | |||
15783 | // FIXME: It would be useful to check constexpr function templates, but at the | |||
15784 | // moment the constant expression evaluator cannot cope with the non-rigorous | |||
15785 | // ASTs which we build for dependent expressions. | |||
15786 | if (FD->isDependentContext()) | |||
15787 | return true; | |||
15788 | ||||
15789 | Expr::EvalStatus Status; | |||
15790 | Status.Diag = &Diags; | |||
15791 | ||||
15792 | EvalInfo Info(FD->getASTContext(), Status, EvalInfo::EM_ConstantExpression); | |||
15793 | Info.InConstantContext = true; | |||
15794 | Info.CheckingPotentialConstantExpression = true; | |||
15795 | ||||
15796 | // The constexpr VM attempts to compile all methods to bytecode here. | |||
15797 | if (Info.EnableNewConstInterp) { | |||
15798 | Info.Ctx.getInterpContext().isPotentialConstantExpr(Info, FD); | |||
15799 | return Diags.empty(); | |||
15800 | } | |||
15801 | ||||
15802 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); | |||
15803 | const CXXRecordDecl *RD = MD ? MD->getParent()->getCanonicalDecl() : nullptr; | |||
15804 | ||||
15805 | // Fabricate an arbitrary expression on the stack and pretend that it | |||
15806 | // is a temporary being used as the 'this' pointer. | |||
15807 | LValue This; | |||
15808 | ImplicitValueInitExpr VIE(RD ? Info.Ctx.getRecordType(RD) : Info.Ctx.IntTy); | |||
15809 | This.set({&VIE, Info.CurrentCall->Index}); | |||
15810 | ||||
15811 | ArrayRef<const Expr*> Args; | |||
15812 | ||||
15813 | APValue Scratch; | |||
15814 | if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) { | |||
15815 | // Evaluate the call as a constant initializer, to allow the construction | |||
15816 | // of objects of non-literal types. | |||
15817 | Info.setEvaluatingDecl(This.getLValueBase(), Scratch); | |||
15818 | HandleConstructorCall(&VIE, This, Args, CD, Info, Scratch); | |||
15819 | } else { | |||
15820 | SourceLocation Loc = FD->getLocation(); | |||
15821 | HandleFunctionCall(Loc, FD, (MD && MD->isInstance()) ? &This : nullptr, | |||
15822 | Args, CallRef(), FD->getBody(), Info, Scratch, nullptr); | |||
15823 | } | |||
15824 | ||||
15825 | return Diags.empty(); | |||
15826 | } | |||
15827 | ||||
15828 | bool Expr::isPotentialConstantExprUnevaluated(Expr *E, | |||
15829 | const FunctionDecl *FD, | |||
15830 | SmallVectorImpl< | |||
15831 | PartialDiagnosticAt> &Diags) { | |||
15832 | assert(!E->isValueDependent() &&(static_cast <bool> (!E->isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!E->isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15833, __extension__ __PRETTY_FUNCTION__ )) | |||
15833 | "Expression evaluator can't be called on a dependent expression.")(static_cast <bool> (!E->isValueDependent() && "Expression evaluator can't be called on a dependent expression." ) ? void (0) : __assert_fail ("!E->isValueDependent() && \"Expression evaluator can't be called on a dependent expression.\"" , "clang/lib/AST/ExprConstant.cpp", 15833, __extension__ __PRETTY_FUNCTION__ )); | |||
15834 | ||||
15835 | Expr::EvalStatus Status; | |||
15836 | Status.Diag = &Diags; | |||
15837 | ||||
15838 | EvalInfo Info(FD->getASTContext(), Status, | |||
15839 | EvalInfo::EM_ConstantExpressionUnevaluated); | |||
15840 | Info.InConstantContext = true; | |||
15841 | Info.CheckingPotentialConstantExpression = true; | |||
15842 | ||||
15843 | // Fabricate a call stack frame to give the arguments a plausible cover story. | |||
15844 | CallStackFrame Frame(Info, SourceLocation(), FD, /*This*/ nullptr, CallRef()); | |||
15845 | ||||
15846 | APValue ResultScratch; | |||
15847 | Evaluate(ResultScratch, Info, E); | |||
15848 | return Diags.empty(); | |||
15849 | } | |||
15850 | ||||
15851 | bool Expr::tryEvaluateObjectSize(uint64_t &Result, ASTContext &Ctx, | |||
15852 | unsigned Type) const { | |||
15853 | if (!getType()->isPointerType()) | |||
15854 | return false; | |||
15855 | ||||
15856 | Expr::EvalStatus Status; | |||
15857 | EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantFold); | |||
15858 | return tryEvaluateBuiltinObjectSize(this, Type, Info, Result); | |||
15859 | } | |||
15860 | ||||
15861 | static bool EvaluateBuiltinStrLen(const Expr *E, uint64_t &Result, | |||
15862 | EvalInfo &Info) { | |||
15863 | if (!E->getType()->hasPointerRepresentation() || !E->isPRValue()) | |||
15864 | return false; | |||
15865 | ||||
15866 | LValue String; | |||
15867 | ||||
15868 | if (!EvaluatePointer(E, String, Info)) | |||
15869 | return false; | |||
15870 | ||||
15871 | QualType CharTy = E->getType()->getPointeeType(); | |||
15872 | ||||
15873 | // Fast path: if it's a string literal, search the string value. | |||
15874 | if (const StringLiteral *S = dyn_cast_or_null<StringLiteral>( | |||
15875 | String.getLValueBase().dyn_cast<const Expr *>())) { | |||
15876 | StringRef Str = S->getBytes(); | |||
15877 | int64_t Off = String.Offset.getQuantity(); | |||
15878 | if (Off >= 0 && (uint64_t)Off <= (uint64_t)Str.size() && | |||
15879 | S->getCharByteWidth() == 1 && | |||
15880 | // FIXME: Add fast-path for wchar_t too. | |||
15881 | Info.Ctx.hasSameUnqualifiedType(CharTy, Info.Ctx.CharTy)) { | |||
15882 | Str = Str.substr(Off); | |||
15883 | ||||
15884 | StringRef::size_type Pos = Str.find(0); | |||
15885 | if (Pos != StringRef::npos) | |||
15886 | Str = Str.substr(0, Pos); | |||
15887 | ||||
15888 | Result = Str.size(); | |||
15889 | return true; | |||
15890 | } | |||
15891 | ||||
15892 | // Fall through to slow path. | |||
15893 | } | |||
15894 | ||||
15895 | // Slow path: scan the bytes of the string looking for the terminating 0. | |||
15896 | for (uint64_t Strlen = 0; /**/; ++Strlen) { | |||
15897 | APValue Char; | |||
15898 | if (!handleLValueToRValueConversion(Info, E, CharTy, String, Char) || | |||
15899 | !Char.isInt()) | |||
15900 | return false; | |||
15901 | if (!Char.getInt()) { | |||
15902 | Result = Strlen; | |||
15903 | return true; | |||
15904 | } | |||
15905 | if (!HandleLValueArrayAdjustment(Info, E, String, CharTy, 1)) | |||
15906 | return false; | |||
15907 | } | |||
15908 | } | |||
15909 | ||||
15910 | bool Expr::tryEvaluateStrLen(uint64_t &Result, ASTContext &Ctx) const { | |||
15911 | Expr::EvalStatus Status; | |||
15912 | EvalInfo Info(Ctx, Status, EvalInfo::EM_ConstantFold); | |||
15913 | return EvaluateBuiltinStrLen(this, Result, Info); | |||
15914 | } |
1 | //===- Optional.h - Simple variant for passing optional values --*- 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 | /// \file |
10 | /// This file provides Optional, a template class modeled in the spirit of |
11 | /// OCaml's 'opt' variant. The idea is to strongly type whether or not |
12 | /// a value can be optional. |
13 | /// |
14 | //===----------------------------------------------------------------------===// |
15 | |
16 | #ifndef LLVM_ADT_OPTIONAL_H |
17 | #define LLVM_ADT_OPTIONAL_H |
18 | |
19 | #include "llvm/ADT/Hashing.h" |
20 | #include "llvm/ADT/None.h" |
21 | #include "llvm/ADT/STLForwardCompat.h" |
22 | #include "llvm/Support/Compiler.h" |
23 | #include "llvm/Support/type_traits.h" |
24 | #include <cassert> |
25 | #include <new> |
26 | #include <utility> |
27 | |
28 | namespace llvm { |
29 | |
30 | class raw_ostream; |
31 | |
32 | namespace optional_detail { |
33 | |
34 | /// Storage for any type. |
35 | // |
36 | // The specialization condition intentionally uses |
37 | // llvm::is_trivially_{copy/move}_constructible instead of |
38 | // std::is_trivially_{copy/move}_constructible. GCC versions prior to 7.4 may |
39 | // instantiate the copy/move constructor of `T` when |
40 | // std::is_trivially_{copy/move}_constructible is instantiated. This causes |
41 | // compilation to fail if we query the trivially copy/move constructible |
42 | // property of a class which is not copy/move constructible. |
43 | // |
44 | // The current implementation of OptionalStorage insists that in order to use |
45 | // the trivial specialization, the value_type must be trivially copy |
46 | // constructible and trivially copy assignable due to =default implementations |
47 | // of the copy/move constructor/assignment. It does not follow that this is |
48 | // necessarily the case std::is_trivially_copyable is true (hence the expanded |
49 | // specialization condition). |
50 | // |
51 | // The move constructible / assignable conditions emulate the remaining behavior |
52 | // of std::is_trivially_copyable. |
53 | template <typename T, |
54 | bool = (llvm::is_trivially_copy_constructible<T>::value && |
55 | std::is_trivially_copy_assignable<T>::value && |
56 | (llvm::is_trivially_move_constructible<T>::value || |
57 | !std::is_move_constructible<T>::value) && |
58 | (std::is_trivially_move_assignable<T>::value || |
59 | !std::is_move_assignable<T>::value))> |
60 | class OptionalStorage { |
61 | union { |
62 | char empty; |
63 | T value; |
64 | }; |
65 | bool hasVal; |
66 | |
67 | public: |
68 | ~OptionalStorage() { reset(); } |
69 | |
70 | constexpr OptionalStorage() noexcept : empty(), hasVal(false) {} |
71 | |
72 | constexpr OptionalStorage(OptionalStorage const &other) : OptionalStorage() { |
73 | if (other.hasValue()) { |
74 | emplace(other.value); |
75 | } |
76 | } |
77 | constexpr OptionalStorage(OptionalStorage &&other) : OptionalStorage() { |
78 | if (other.hasValue()) { |
79 | emplace(std::move(other.value)); |
80 | } |
81 | } |
82 | |
83 | template <class... Args> |
84 | constexpr explicit OptionalStorage(in_place_t, Args &&... args) |
85 | : value(std::forward<Args>(args)...), hasVal(true) {} |
86 | |
87 | void reset() noexcept { |
88 | if (hasVal) { |
89 | value.~T(); |
90 | hasVal = false; |
91 | } |
92 | } |
93 | |
94 | constexpr bool hasValue() const noexcept { return hasVal; } |
95 | |
96 | T &getValue() LLVM_LVALUE_FUNCTION& noexcept { |
97 | assert(hasVal)(static_cast <bool> (hasVal) ? void (0) : __assert_fail ("hasVal", "llvm/include/llvm/ADT/Optional.h", 97, __extension__ __PRETTY_FUNCTION__)); |
98 | return value; |
99 | } |
100 | constexpr T const &getValue() const LLVM_LVALUE_FUNCTION& noexcept { |
101 | assert(hasVal)(static_cast <bool> (hasVal) ? void (0) : __assert_fail ("hasVal", "llvm/include/llvm/ADT/Optional.h", 101, __extension__ __PRETTY_FUNCTION__)); |
102 | return value; |
103 | } |
104 | #if LLVM_HAS_RVALUE_REFERENCE_THIS1 |
105 | T &&getValue() && noexcept { |
106 | assert(hasVal)(static_cast <bool> (hasVal) ? void (0) : __assert_fail ("hasVal", "llvm/include/llvm/ADT/Optional.h", 106, __extension__ __PRETTY_FUNCTION__)); |
107 | return std::move(value); |
108 | } |
109 | #endif |
110 | |
111 | template <class... Args> void emplace(Args &&... args) { |
112 | reset(); |
113 | ::new ((void *)std::addressof(value)) T(std::forward<Args>(args)...); |
114 | hasVal = true; |
115 | } |
116 | |
117 | OptionalStorage &operator=(T const &y) { |
118 | if (hasValue()) { |
119 | value = y; |
120 | } else { |
121 | ::new ((void *)std::addressof(value)) T(y); |
122 | hasVal = true; |
123 | } |
124 | return *this; |
125 | } |
126 | OptionalStorage &operator=(T &&y) { |
127 | if (hasValue()) { |
128 | value = std::move(y); |
129 | } else { |
130 | ::new ((void *)std::addressof(value)) T(std::move(y)); |
131 | hasVal = true; |
132 | } |
133 | return *this; |
134 | } |
135 | |
136 | OptionalStorage &operator=(OptionalStorage const &other) { |
137 | if (other.hasValue()) { |
138 | if (hasValue()) { |
139 | value = other.value; |
140 | } else { |
141 | ::new ((void *)std::addressof(value)) T(other.value); |
142 | hasVal = true; |
143 | } |
144 | } else { |
145 | reset(); |
146 | } |
147 | return *this; |
148 | } |
149 | |
150 | OptionalStorage &operator=(OptionalStorage &&other) { |
151 | if (other.hasValue()) { |
152 | if (hasValue()) { |
153 | value = std::move(other.value); |
154 | } else { |
155 | ::new ((void *)std::addressof(value)) T(std::move(other.value)); |
156 | hasVal = true; |
157 | } |
158 | } else { |
159 | reset(); |
160 | } |
161 | return *this; |
162 | } |
163 | }; |
164 | |
165 | template <typename T> class OptionalStorage<T, true> { |
166 | union { |
167 | char empty; |
168 | T value; |
169 | }; |
170 | bool hasVal = false; |
171 | |
172 | public: |
173 | ~OptionalStorage() = default; |
174 | |
175 | constexpr OptionalStorage() noexcept : empty{} {} |
176 | |
177 | constexpr OptionalStorage(OptionalStorage const &other) = default; |
178 | constexpr OptionalStorage(OptionalStorage &&other) = default; |
179 | |
180 | OptionalStorage &operator=(OptionalStorage const &other) = default; |
181 | OptionalStorage &operator=(OptionalStorage &&other) = default; |
182 | |
183 | template <class... Args> |
184 | constexpr explicit OptionalStorage(in_place_t, Args &&... args) |
185 | : value(std::forward<Args>(args)...), hasVal(true) {} |
186 | |
187 | void reset() noexcept { |
188 | if (hasVal) { |
189 | value.~T(); |
190 | hasVal = false; |
191 | } |
192 | } |
193 | |
194 | constexpr bool hasValue() const noexcept { return hasVal; } |
195 | |
196 | T &getValue() LLVM_LVALUE_FUNCTION& noexcept { |
197 | assert(hasVal)(static_cast <bool> (hasVal) ? void (0) : __assert_fail ("hasVal", "llvm/include/llvm/ADT/Optional.h", 197, __extension__ __PRETTY_FUNCTION__)); |
198 | return value; |
199 | } |
200 | constexpr T const &getValue() const LLVM_LVALUE_FUNCTION& noexcept { |
201 | assert(hasVal)(static_cast <bool> (hasVal) ? void (0) : __assert_fail ("hasVal", "llvm/include/llvm/ADT/Optional.h", 201, __extension__ __PRETTY_FUNCTION__)); |
202 | return value; |
203 | } |
204 | #if LLVM_HAS_RVALUE_REFERENCE_THIS1 |
205 | T &&getValue() && noexcept { |
206 | assert(hasVal)(static_cast <bool> (hasVal) ? void (0) : __assert_fail ("hasVal", "llvm/include/llvm/ADT/Optional.h", 206, __extension__ __PRETTY_FUNCTION__)); |
207 | return std::move(value); |
208 | } |
209 | #endif |
210 | |
211 | template <class... Args> void emplace(Args &&... args) { |
212 | reset(); |
213 | ::new ((void *)std::addressof(value)) T(std::forward<Args>(args)...); |
214 | hasVal = true; |
215 | } |
216 | |
217 | OptionalStorage &operator=(T const &y) { |
218 | if (hasValue()) { |
219 | value = y; |
220 | } else { |
221 | ::new ((void *)std::addressof(value)) T(y); |
222 | hasVal = true; |
223 | } |
224 | return *this; |
225 | } |
226 | OptionalStorage &operator=(T &&y) { |
227 | if (hasValue()) { |
228 | value = std::move(y); |
229 | } else { |
230 | ::new ((void *)std::addressof(value)) T(std::move(y)); |
231 | hasVal = true; |
232 | } |
233 | return *this; |
234 | } |
235 | }; |
236 | |
237 | } // namespace optional_detail |
238 | |
239 | template <typename T> class Optional { |
240 | optional_detail::OptionalStorage<T> Storage; |
241 | |
242 | public: |
243 | using value_type = T; |
244 | |
245 | constexpr Optional() = default; |
246 | constexpr Optional(NoneType) {} |
247 | |
248 | constexpr Optional(const T &y) : Storage(in_place, y) {} |
249 | constexpr Optional(const Optional &O) = default; |
250 | |
251 | constexpr Optional(T &&y) : Storage(in_place, std::move(y)) {} |
252 | constexpr Optional(Optional &&O) = default; |
253 | |
254 | template <typename... ArgTypes> |
255 | constexpr Optional(in_place_t, ArgTypes &&...Args) |
256 | : Storage(in_place, std::forward<ArgTypes>(Args)...) {} |
257 | |
258 | Optional &operator=(T &&y) { |
259 | Storage = std::move(y); |
260 | return *this; |
261 | } |
262 | Optional &operator=(Optional &&O) = default; |
263 | |
264 | /// Create a new object by constructing it in place with the given arguments. |
265 | template <typename... ArgTypes> void emplace(ArgTypes &&... Args) { |
266 | Storage.emplace(std::forward<ArgTypes>(Args)...); |
267 | } |
268 | |
269 | static constexpr Optional create(const T *y) { |
270 | return y ? Optional(*y) : Optional(); |
271 | } |
272 | |
273 | Optional &operator=(const T &y) { |
274 | Storage = y; |
275 | return *this; |
276 | } |
277 | Optional &operator=(const Optional &O) = default; |
278 | |
279 | void reset() { Storage.reset(); } |
280 | |
281 | constexpr const T *getPointer() const { return &Storage.getValue(); } |
282 | T *getPointer() { return &Storage.getValue(); } |
283 | constexpr const T &getValue() const LLVM_LVALUE_FUNCTION& { |
284 | return Storage.getValue(); |
285 | } |
286 | T &getValue() LLVM_LVALUE_FUNCTION& { return Storage.getValue(); } |
287 | |
288 | constexpr explicit operator bool() const { return hasValue(); } |
289 | constexpr bool hasValue() const { return Storage.hasValue(); } |
290 | constexpr const T *operator->() const { return getPointer(); } |
291 | T *operator->() { return getPointer(); } |
292 | constexpr const T &operator*() const LLVM_LVALUE_FUNCTION& { |
293 | return getValue(); |
294 | } |
295 | T &operator*() LLVM_LVALUE_FUNCTION& { return getValue(); } |
296 | |
297 | template <typename U> |
298 | constexpr T getValueOr(U &&value) const LLVM_LVALUE_FUNCTION& { |
299 | return hasValue() ? getValue() : std::forward<U>(value); |
300 | } |
301 | |
302 | /// Apply a function to the value if present; otherwise return None. |
303 | template <class Function> |
304 | auto map(const Function &F) const LLVM_LVALUE_FUNCTION& |
305 | -> Optional<decltype(F(getValue()))> { |
306 | if (*this) return F(getValue()); |
307 | return None; |
308 | } |
309 | |
310 | #if LLVM_HAS_RVALUE_REFERENCE_THIS1 |
311 | T &&getValue() && { return std::move(Storage.getValue()); } |
312 | T &&operator*() && { return std::move(Storage.getValue()); } |
313 | |
314 | template <typename U> |
315 | T getValueOr(U &&value) && { |
316 | return hasValue() ? std::move(getValue()) : std::forward<U>(value); |
317 | } |
318 | |
319 | /// Apply a function to the value if present; otherwise return None. |
320 | template <class Function> |
321 | auto map(const Function &F) && |
322 | -> Optional<decltype(F(std::move(*this).getValue()))> { |
323 | if (*this) return F(std::move(*this).getValue()); |
324 | return None; |
325 | } |
326 | #endif |
327 | }; |
328 | |
329 | template <class T> llvm::hash_code hash_value(const Optional<T> &O) { |
330 | return O ? hash_combine(true, *O) : hash_value(false); |
331 | } |
332 | |
333 | template <typename T, typename U> |
334 | constexpr bool operator==(const Optional<T> &X, const Optional<U> &Y) { |
335 | if (X && Y) |
336 | return *X == *Y; |
337 | return X.hasValue() == Y.hasValue(); |
338 | } |
339 | |
340 | template <typename T, typename U> |
341 | constexpr bool operator!=(const Optional<T> &X, const Optional<U> &Y) { |
342 | return !(X == Y); |
343 | } |
344 | |
345 | template <typename T, typename U> |
346 | constexpr bool operator<(const Optional<T> &X, const Optional<U> &Y) { |
347 | if (X && Y) |
348 | return *X < *Y; |
349 | return X.hasValue() < Y.hasValue(); |
350 | } |
351 | |
352 | template <typename T, typename U> |
353 | constexpr bool operator<=(const Optional<T> &X, const Optional<U> &Y) { |
354 | return !(Y < X); |
355 | } |
356 | |
357 | template <typename T, typename U> |
358 | constexpr bool operator>(const Optional<T> &X, const Optional<U> &Y) { |
359 | return Y < X; |
360 | } |
361 | |
362 | template <typename T, typename U> |
363 | constexpr bool operator>=(const Optional<T> &X, const Optional<U> &Y) { |
364 | return !(X < Y); |
365 | } |
366 | |
367 | template <typename T> |
368 | constexpr bool operator==(const Optional<T> &X, NoneType) { |
369 | return !X; |
370 | } |
371 | |
372 | template <typename T> |
373 | constexpr bool operator==(NoneType, const Optional<T> &X) { |
374 | return X == None; |
375 | } |
376 | |
377 | template <typename T> |
378 | constexpr bool operator!=(const Optional<T> &X, NoneType) { |
379 | return !(X == None); |
380 | } |
381 | |
382 | template <typename T> |
383 | constexpr bool operator!=(NoneType, const Optional<T> &X) { |
384 | return X != None; |
385 | } |
386 | |
387 | template <typename T> constexpr bool operator<(const Optional<T> &, NoneType) { |
388 | return false; |
389 | } |
390 | |
391 | template <typename T> constexpr bool operator<(NoneType, const Optional<T> &X) { |
392 | return X.hasValue(); |
393 | } |
394 | |
395 | template <typename T> |
396 | constexpr bool operator<=(const Optional<T> &X, NoneType) { |
397 | return !(None < X); |
398 | } |
399 | |
400 | template <typename T> |
401 | constexpr bool operator<=(NoneType, const Optional<T> &X) { |
402 | return !(X < None); |
403 | } |
404 | |
405 | template <typename T> constexpr bool operator>(const Optional<T> &X, NoneType) { |
406 | return None < X; |
407 | } |
408 | |
409 | template <typename T> constexpr bool operator>(NoneType, const Optional<T> &X) { |
410 | return X < None; |
411 | } |
412 | |
413 | template <typename T> |
414 | constexpr bool operator>=(const Optional<T> &X, NoneType) { |
415 | return None <= X; |
416 | } |
417 | |
418 | template <typename T> |
419 | constexpr bool operator>=(NoneType, const Optional<T> &X) { |
420 | return X <= None; |
421 | } |
422 | |
423 | template <typename T> |
424 | constexpr bool operator==(const Optional<T> &X, const T &Y) { |
425 | return X && *X == Y; |
426 | } |
427 | |
428 | template <typename T> |
429 | constexpr bool operator==(const T &X, const Optional<T> &Y) { |
430 | return Y && X == *Y; |
431 | } |
432 | |
433 | template <typename T> |
434 | constexpr bool operator!=(const Optional<T> &X, const T &Y) { |
435 | return !(X == Y); |
436 | } |
437 | |
438 | template <typename T> |
439 | constexpr bool operator!=(const T &X, const Optional<T> &Y) { |
440 | return !(X == Y); |
441 | } |
442 | |
443 | template <typename T> |
444 | constexpr bool operator<(const Optional<T> &X, const T &Y) { |
445 | return !X || *X < Y; |
446 | } |
447 | |
448 | template <typename T> |
449 | constexpr bool operator<(const T &X, const Optional<T> &Y) { |
450 | return Y && X < *Y; |
451 | } |
452 | |
453 | template <typename T> |
454 | constexpr bool operator<=(const Optional<T> &X, const T &Y) { |
455 | return !(Y < X); |
456 | } |
457 | |
458 | template <typename T> |
459 | constexpr bool operator<=(const T &X, const Optional<T> &Y) { |
460 | return !(Y < X); |
461 | } |
462 | |
463 | template <typename T> |
464 | constexpr bool operator>(const Optional<T> &X, const T &Y) { |
465 | return Y < X; |
466 | } |
467 | |
468 | template <typename T> |
469 | constexpr bool operator>(const T &X, const Optional<T> &Y) { |
470 | return Y < X; |
471 | } |
472 | |
473 | template <typename T> |
474 | constexpr bool operator>=(const Optional<T> &X, const T &Y) { |
475 | return !(X < Y); |
476 | } |
477 | |
478 | template <typename T> |
479 | constexpr bool operator>=(const T &X, const Optional<T> &Y) { |
480 | return !(X < Y); |
481 | } |
482 | |
483 | raw_ostream &operator<<(raw_ostream &OS, NoneType); |
484 | |
485 | template <typename T, typename = decltype(std::declval<raw_ostream &>() |
486 | << std::declval<const T &>())> |
487 | raw_ostream &operator<<(raw_ostream &OS, const Optional<T> &O) { |
488 | if (O) |
489 | OS << *O; |
490 | else |
491 | OS << None; |
492 | return OS; |
493 | } |
494 | |
495 | } // end namespace llvm |
496 | |
497 | #endif // LLVM_ADT_OPTIONAL_H |