File: | tools/clang/include/clang/Sema/Overload.h |
Warning: | line 832, column 16 Called C++ object pointer is null |
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1 | //===--- SemaOverload.cpp - C++ Overloading -------------------------------===// | ||||
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 provides Sema routines for C++ overloading. | ||||
10 | // | ||||
11 | //===----------------------------------------------------------------------===// | ||||
12 | |||||
13 | #include "clang/Sema/Overload.h" | ||||
14 | #include "clang/AST/ASTContext.h" | ||||
15 | #include "clang/AST/CXXInheritance.h" | ||||
16 | #include "clang/AST/DeclObjC.h" | ||||
17 | #include "clang/AST/Expr.h" | ||||
18 | #include "clang/AST/ExprCXX.h" | ||||
19 | #include "clang/AST/ExprObjC.h" | ||||
20 | #include "clang/AST/TypeOrdering.h" | ||||
21 | #include "clang/Basic/Diagnostic.h" | ||||
22 | #include "clang/Basic/DiagnosticOptions.h" | ||||
23 | #include "clang/Basic/PartialDiagnostic.h" | ||||
24 | #include "clang/Basic/TargetInfo.h" | ||||
25 | #include "clang/Sema/Initialization.h" | ||||
26 | #include "clang/Sema/Lookup.h" | ||||
27 | #include "clang/Sema/SemaInternal.h" | ||||
28 | #include "clang/Sema/Template.h" | ||||
29 | #include "clang/Sema/TemplateDeduction.h" | ||||
30 | #include "llvm/ADT/DenseSet.h" | ||||
31 | #include "llvm/ADT/Optional.h" | ||||
32 | #include "llvm/ADT/STLExtras.h" | ||||
33 | #include "llvm/ADT/SmallPtrSet.h" | ||||
34 | #include "llvm/ADT/SmallString.h" | ||||
35 | #include <algorithm> | ||||
36 | #include <cstdlib> | ||||
37 | |||||
38 | using namespace clang; | ||||
39 | using namespace sema; | ||||
40 | |||||
41 | static bool functionHasPassObjectSizeParams(const FunctionDecl *FD) { | ||||
42 | return llvm::any_of(FD->parameters(), [](const ParmVarDecl *P) { | ||||
43 | return P->hasAttr<PassObjectSizeAttr>(); | ||||
44 | }); | ||||
45 | } | ||||
46 | |||||
47 | /// A convenience routine for creating a decayed reference to a function. | ||||
48 | static ExprResult | ||||
49 | CreateFunctionRefExpr(Sema &S, FunctionDecl *Fn, NamedDecl *FoundDecl, | ||||
50 | const Expr *Base, bool HadMultipleCandidates, | ||||
51 | SourceLocation Loc = SourceLocation(), | ||||
52 | const DeclarationNameLoc &LocInfo = DeclarationNameLoc()){ | ||||
53 | if (S.DiagnoseUseOfDecl(FoundDecl, Loc)) | ||||
54 | return ExprError(); | ||||
55 | // If FoundDecl is different from Fn (such as if one is a template | ||||
56 | // and the other a specialization), make sure DiagnoseUseOfDecl is | ||||
57 | // called on both. | ||||
58 | // FIXME: This would be more comprehensively addressed by modifying | ||||
59 | // DiagnoseUseOfDecl to accept both the FoundDecl and the decl | ||||
60 | // being used. | ||||
61 | if (FoundDecl != Fn && S.DiagnoseUseOfDecl(Fn, Loc)) | ||||
62 | return ExprError(); | ||||
63 | if (auto *FPT = Fn->getType()->getAs<FunctionProtoType>()) | ||||
64 | S.ResolveExceptionSpec(Loc, FPT); | ||||
65 | DeclRefExpr *DRE = new (S.Context) | ||||
66 | DeclRefExpr(S.Context, Fn, false, Fn->getType(), VK_LValue, Loc, LocInfo); | ||||
67 | if (HadMultipleCandidates) | ||||
68 | DRE->setHadMultipleCandidates(true); | ||||
69 | |||||
70 | S.MarkDeclRefReferenced(DRE, Base); | ||||
71 | return S.ImpCastExprToType(DRE, S.Context.getPointerType(DRE->getType()), | ||||
72 | CK_FunctionToPointerDecay); | ||||
73 | } | ||||
74 | |||||
75 | static bool IsStandardConversion(Sema &S, Expr* From, QualType ToType, | ||||
76 | bool InOverloadResolution, | ||||
77 | StandardConversionSequence &SCS, | ||||
78 | bool CStyle, | ||||
79 | bool AllowObjCWritebackConversion); | ||||
80 | |||||
81 | static bool IsTransparentUnionStandardConversion(Sema &S, Expr* From, | ||||
82 | QualType &ToType, | ||||
83 | bool InOverloadResolution, | ||||
84 | StandardConversionSequence &SCS, | ||||
85 | bool CStyle); | ||||
86 | static OverloadingResult | ||||
87 | IsUserDefinedConversion(Sema &S, Expr *From, QualType ToType, | ||||
88 | UserDefinedConversionSequence& User, | ||||
89 | OverloadCandidateSet& Conversions, | ||||
90 | bool AllowExplicit, | ||||
91 | bool AllowObjCConversionOnExplicit); | ||||
92 | |||||
93 | |||||
94 | static ImplicitConversionSequence::CompareKind | ||||
95 | CompareStandardConversionSequences(Sema &S, SourceLocation Loc, | ||||
96 | const StandardConversionSequence& SCS1, | ||||
97 | const StandardConversionSequence& SCS2); | ||||
98 | |||||
99 | static ImplicitConversionSequence::CompareKind | ||||
100 | CompareQualificationConversions(Sema &S, | ||||
101 | const StandardConversionSequence& SCS1, | ||||
102 | const StandardConversionSequence& SCS2); | ||||
103 | |||||
104 | static ImplicitConversionSequence::CompareKind | ||||
105 | CompareDerivedToBaseConversions(Sema &S, SourceLocation Loc, | ||||
106 | const StandardConversionSequence& SCS1, | ||||
107 | const StandardConversionSequence& SCS2); | ||||
108 | |||||
109 | /// GetConversionRank - Retrieve the implicit conversion rank | ||||
110 | /// corresponding to the given implicit conversion kind. | ||||
111 | ImplicitConversionRank clang::GetConversionRank(ImplicitConversionKind Kind) { | ||||
112 | static const ImplicitConversionRank | ||||
113 | Rank[(int)ICK_Num_Conversion_Kinds] = { | ||||
114 | ICR_Exact_Match, | ||||
115 | ICR_Exact_Match, | ||||
116 | ICR_Exact_Match, | ||||
117 | ICR_Exact_Match, | ||||
118 | ICR_Exact_Match, | ||||
119 | ICR_Exact_Match, | ||||
120 | ICR_Promotion, | ||||
121 | ICR_Promotion, | ||||
122 | ICR_Promotion, | ||||
123 | ICR_Conversion, | ||||
124 | ICR_Conversion, | ||||
125 | ICR_Conversion, | ||||
126 | ICR_Conversion, | ||||
127 | ICR_Conversion, | ||||
128 | ICR_Conversion, | ||||
129 | ICR_Conversion, | ||||
130 | ICR_Conversion, | ||||
131 | ICR_Conversion, | ||||
132 | ICR_Conversion, | ||||
133 | ICR_OCL_Scalar_Widening, | ||||
134 | ICR_Complex_Real_Conversion, | ||||
135 | ICR_Conversion, | ||||
136 | ICR_Conversion, | ||||
137 | ICR_Writeback_Conversion, | ||||
138 | ICR_Exact_Match, // NOTE(gbiv): This may not be completely right -- | ||||
139 | // it was omitted by the patch that added | ||||
140 | // ICK_Zero_Event_Conversion | ||||
141 | ICR_C_Conversion, | ||||
142 | ICR_C_Conversion_Extension | ||||
143 | }; | ||||
144 | return Rank[(int)Kind]; | ||||
145 | } | ||||
146 | |||||
147 | /// GetImplicitConversionName - Return the name of this kind of | ||||
148 | /// implicit conversion. | ||||
149 | static const char* GetImplicitConversionName(ImplicitConversionKind Kind) { | ||||
150 | static const char* const Name[(int)ICK_Num_Conversion_Kinds] = { | ||||
151 | "No conversion", | ||||
152 | "Lvalue-to-rvalue", | ||||
153 | "Array-to-pointer", | ||||
154 | "Function-to-pointer", | ||||
155 | "Function pointer conversion", | ||||
156 | "Qualification", | ||||
157 | "Integral promotion", | ||||
158 | "Floating point promotion", | ||||
159 | "Complex promotion", | ||||
160 | "Integral conversion", | ||||
161 | "Floating conversion", | ||||
162 | "Complex conversion", | ||||
163 | "Floating-integral conversion", | ||||
164 | "Pointer conversion", | ||||
165 | "Pointer-to-member conversion", | ||||
166 | "Boolean conversion", | ||||
167 | "Compatible-types conversion", | ||||
168 | "Derived-to-base conversion", | ||||
169 | "Vector conversion", | ||||
170 | "Vector splat", | ||||
171 | "Complex-real conversion", | ||||
172 | "Block Pointer conversion", | ||||
173 | "Transparent Union Conversion", | ||||
174 | "Writeback conversion", | ||||
175 | "OpenCL Zero Event Conversion", | ||||
176 | "C specific type conversion", | ||||
177 | "Incompatible pointer conversion" | ||||
178 | }; | ||||
179 | return Name[Kind]; | ||||
180 | } | ||||
181 | |||||
182 | /// StandardConversionSequence - Set the standard conversion | ||||
183 | /// sequence to the identity conversion. | ||||
184 | void StandardConversionSequence::setAsIdentityConversion() { | ||||
185 | First = ICK_Identity; | ||||
186 | Second = ICK_Identity; | ||||
187 | Third = ICK_Identity; | ||||
188 | DeprecatedStringLiteralToCharPtr = false; | ||||
189 | QualificationIncludesObjCLifetime = false; | ||||
190 | ReferenceBinding = false; | ||||
191 | DirectBinding = false; | ||||
192 | IsLvalueReference = true; | ||||
193 | BindsToFunctionLvalue = false; | ||||
194 | BindsToRvalue = false; | ||||
195 | BindsImplicitObjectArgumentWithoutRefQualifier = false; | ||||
196 | ObjCLifetimeConversionBinding = false; | ||||
197 | CopyConstructor = nullptr; | ||||
198 | } | ||||
199 | |||||
200 | /// getRank - Retrieve the rank of this standard conversion sequence | ||||
201 | /// (C++ 13.3.3.1.1p3). The rank is the largest rank of each of the | ||||
202 | /// implicit conversions. | ||||
203 | ImplicitConversionRank StandardConversionSequence::getRank() const { | ||||
204 | ImplicitConversionRank Rank = ICR_Exact_Match; | ||||
205 | if (GetConversionRank(First) > Rank) | ||||
206 | Rank = GetConversionRank(First); | ||||
207 | if (GetConversionRank(Second) > Rank) | ||||
208 | Rank = GetConversionRank(Second); | ||||
209 | if (GetConversionRank(Third) > Rank) | ||||
210 | Rank = GetConversionRank(Third); | ||||
211 | return Rank; | ||||
212 | } | ||||
213 | |||||
214 | /// isPointerConversionToBool - Determines whether this conversion is | ||||
215 | /// a conversion of a pointer or pointer-to-member to bool. This is | ||||
216 | /// used as part of the ranking of standard conversion sequences | ||||
217 | /// (C++ 13.3.3.2p4). | ||||
218 | bool StandardConversionSequence::isPointerConversionToBool() const { | ||||
219 | // Note that FromType has not necessarily been transformed by the | ||||
220 | // array-to-pointer or function-to-pointer implicit conversions, so | ||||
221 | // check for their presence as well as checking whether FromType is | ||||
222 | // a pointer. | ||||
223 | if (getToType(1)->isBooleanType() && | ||||
224 | (getFromType()->isPointerType() || | ||||
225 | getFromType()->isMemberPointerType() || | ||||
226 | getFromType()->isObjCObjectPointerType() || | ||||
227 | getFromType()->isBlockPointerType() || | ||||
228 | getFromType()->isNullPtrType() || | ||||
229 | First == ICK_Array_To_Pointer || First == ICK_Function_To_Pointer)) | ||||
230 | return true; | ||||
231 | |||||
232 | return false; | ||||
233 | } | ||||
234 | |||||
235 | /// isPointerConversionToVoidPointer - Determines whether this | ||||
236 | /// conversion is a conversion of a pointer to a void pointer. This is | ||||
237 | /// used as part of the ranking of standard conversion sequences (C++ | ||||
238 | /// 13.3.3.2p4). | ||||
239 | bool | ||||
240 | StandardConversionSequence:: | ||||
241 | isPointerConversionToVoidPointer(ASTContext& Context) const { | ||||
242 | QualType FromType = getFromType(); | ||||
243 | QualType ToType = getToType(1); | ||||
244 | |||||
245 | // Note that FromType has not necessarily been transformed by the | ||||
246 | // array-to-pointer implicit conversion, so check for its presence | ||||
247 | // and redo the conversion to get a pointer. | ||||
248 | if (First == ICK_Array_To_Pointer) | ||||
249 | FromType = Context.getArrayDecayedType(FromType); | ||||
250 | |||||
251 | if (Second == ICK_Pointer_Conversion && FromType->isAnyPointerType()) | ||||
252 | if (const PointerType* ToPtrType = ToType->getAs<PointerType>()) | ||||
253 | return ToPtrType->getPointeeType()->isVoidType(); | ||||
254 | |||||
255 | return false; | ||||
256 | } | ||||
257 | |||||
258 | /// Skip any implicit casts which could be either part of a narrowing conversion | ||||
259 | /// or after one in an implicit conversion. | ||||
260 | static const Expr *IgnoreNarrowingConversion(ASTContext &Ctx, | ||||
261 | const Expr *Converted) { | ||||
262 | // We can have cleanups wrapping the converted expression; these need to be | ||||
263 | // preserved so that destructors run if necessary. | ||||
264 | if (auto *EWC = dyn_cast<ExprWithCleanups>(Converted)) { | ||||
265 | Expr *Inner = | ||||
266 | const_cast<Expr *>(IgnoreNarrowingConversion(Ctx, EWC->getSubExpr())); | ||||
267 | return ExprWithCleanups::Create(Ctx, Inner, EWC->cleanupsHaveSideEffects(), | ||||
268 | EWC->getObjects()); | ||||
269 | } | ||||
270 | |||||
271 | while (auto *ICE = dyn_cast<ImplicitCastExpr>(Converted)) { | ||||
272 | switch (ICE->getCastKind()) { | ||||
273 | case CK_NoOp: | ||||
274 | case CK_IntegralCast: | ||||
275 | case CK_IntegralToBoolean: | ||||
276 | case CK_IntegralToFloating: | ||||
277 | case CK_BooleanToSignedIntegral: | ||||
278 | case CK_FloatingToIntegral: | ||||
279 | case CK_FloatingToBoolean: | ||||
280 | case CK_FloatingCast: | ||||
281 | Converted = ICE->getSubExpr(); | ||||
282 | continue; | ||||
283 | |||||
284 | default: | ||||
285 | return Converted; | ||||
286 | } | ||||
287 | } | ||||
288 | |||||
289 | return Converted; | ||||
290 | } | ||||
291 | |||||
292 | /// Check if this standard conversion sequence represents a narrowing | ||||
293 | /// conversion, according to C++11 [dcl.init.list]p7. | ||||
294 | /// | ||||
295 | /// \param Ctx The AST context. | ||||
296 | /// \param Converted The result of applying this standard conversion sequence. | ||||
297 | /// \param ConstantValue If this is an NK_Constant_Narrowing conversion, the | ||||
298 | /// value of the expression prior to the narrowing conversion. | ||||
299 | /// \param ConstantType If this is an NK_Constant_Narrowing conversion, the | ||||
300 | /// type of the expression prior to the narrowing conversion. | ||||
301 | /// \param IgnoreFloatToIntegralConversion If true type-narrowing conversions | ||||
302 | /// from floating point types to integral types should be ignored. | ||||
303 | NarrowingKind StandardConversionSequence::getNarrowingKind( | ||||
304 | ASTContext &Ctx, const Expr *Converted, APValue &ConstantValue, | ||||
305 | QualType &ConstantType, bool IgnoreFloatToIntegralConversion) const { | ||||
306 | assert(Ctx.getLangOpts().CPlusPlus && "narrowing check outside C++")((Ctx.getLangOpts().CPlusPlus && "narrowing check outside C++" ) ? static_cast<void> (0) : __assert_fail ("Ctx.getLangOpts().CPlusPlus && \"narrowing check outside C++\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 306, __PRETTY_FUNCTION__)); | ||||
307 | |||||
308 | // C++11 [dcl.init.list]p7: | ||||
309 | // A narrowing conversion is an implicit conversion ... | ||||
310 | QualType FromType = getToType(0); | ||||
311 | QualType ToType = getToType(1); | ||||
312 | |||||
313 | // A conversion to an enumeration type is narrowing if the conversion to | ||||
314 | // the underlying type is narrowing. This only arises for expressions of | ||||
315 | // the form 'Enum{init}'. | ||||
316 | if (auto *ET = ToType->getAs<EnumType>()) | ||||
317 | ToType = ET->getDecl()->getIntegerType(); | ||||
318 | |||||
319 | switch (Second) { | ||||
320 | // 'bool' is an integral type; dispatch to the right place to handle it. | ||||
321 | case ICK_Boolean_Conversion: | ||||
322 | if (FromType->isRealFloatingType()) | ||||
323 | goto FloatingIntegralConversion; | ||||
324 | if (FromType->isIntegralOrUnscopedEnumerationType()) | ||||
325 | goto IntegralConversion; | ||||
326 | // Boolean conversions can be from pointers and pointers to members | ||||
327 | // [conv.bool], and those aren't considered narrowing conversions. | ||||
328 | return NK_Not_Narrowing; | ||||
329 | |||||
330 | // -- from a floating-point type to an integer type, or | ||||
331 | // | ||||
332 | // -- from an integer type or unscoped enumeration type to a floating-point | ||||
333 | // type, except where the source is a constant expression and the actual | ||||
334 | // value after conversion will fit into the target type and will produce | ||||
335 | // the original value when converted back to the original type, or | ||||
336 | case ICK_Floating_Integral: | ||||
337 | FloatingIntegralConversion: | ||||
338 | if (FromType->isRealFloatingType() && ToType->isIntegralType(Ctx)) { | ||||
339 | return NK_Type_Narrowing; | ||||
340 | } else if (FromType->isIntegralOrUnscopedEnumerationType() && | ||||
341 | ToType->isRealFloatingType()) { | ||||
342 | if (IgnoreFloatToIntegralConversion) | ||||
343 | return NK_Not_Narrowing; | ||||
344 | llvm::APSInt IntConstantValue; | ||||
345 | const Expr *Initializer = IgnoreNarrowingConversion(Ctx, Converted); | ||||
346 | assert(Initializer && "Unknown conversion expression")((Initializer && "Unknown conversion expression") ? static_cast <void> (0) : __assert_fail ("Initializer && \"Unknown conversion expression\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 346, __PRETTY_FUNCTION__)); | ||||
347 | |||||
348 | // If it's value-dependent, we can't tell whether it's narrowing. | ||||
349 | if (Initializer->isValueDependent()) | ||||
350 | return NK_Dependent_Narrowing; | ||||
351 | |||||
352 | if (Initializer->isIntegerConstantExpr(IntConstantValue, Ctx)) { | ||||
353 | // Convert the integer to the floating type. | ||||
354 | llvm::APFloat Result(Ctx.getFloatTypeSemantics(ToType)); | ||||
355 | Result.convertFromAPInt(IntConstantValue, IntConstantValue.isSigned(), | ||||
356 | llvm::APFloat::rmNearestTiesToEven); | ||||
357 | // And back. | ||||
358 | llvm::APSInt ConvertedValue = IntConstantValue; | ||||
359 | bool ignored; | ||||
360 | Result.convertToInteger(ConvertedValue, | ||||
361 | llvm::APFloat::rmTowardZero, &ignored); | ||||
362 | // If the resulting value is different, this was a narrowing conversion. | ||||
363 | if (IntConstantValue != ConvertedValue) { | ||||
364 | ConstantValue = APValue(IntConstantValue); | ||||
365 | ConstantType = Initializer->getType(); | ||||
366 | return NK_Constant_Narrowing; | ||||
367 | } | ||||
368 | } else { | ||||
369 | // Variables are always narrowings. | ||||
370 | return NK_Variable_Narrowing; | ||||
371 | } | ||||
372 | } | ||||
373 | return NK_Not_Narrowing; | ||||
374 | |||||
375 | // -- from long double to double or float, or from double to float, except | ||||
376 | // where the source is a constant expression and the actual value after | ||||
377 | // conversion is within the range of values that can be represented (even | ||||
378 | // if it cannot be represented exactly), or | ||||
379 | case ICK_Floating_Conversion: | ||||
380 | if (FromType->isRealFloatingType() && ToType->isRealFloatingType() && | ||||
381 | Ctx.getFloatingTypeOrder(FromType, ToType) == 1) { | ||||
382 | // FromType is larger than ToType. | ||||
383 | const Expr *Initializer = IgnoreNarrowingConversion(Ctx, Converted); | ||||
384 | |||||
385 | // If it's value-dependent, we can't tell whether it's narrowing. | ||||
386 | if (Initializer->isValueDependent()) | ||||
387 | return NK_Dependent_Narrowing; | ||||
388 | |||||
389 | if (Initializer->isCXX11ConstantExpr(Ctx, &ConstantValue)) { | ||||
390 | // Constant! | ||||
391 | assert(ConstantValue.isFloat())((ConstantValue.isFloat()) ? static_cast<void> (0) : __assert_fail ("ConstantValue.isFloat()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 391, __PRETTY_FUNCTION__)); | ||||
392 | llvm::APFloat FloatVal = ConstantValue.getFloat(); | ||||
393 | // Convert the source value into the target type. | ||||
394 | bool ignored; | ||||
395 | llvm::APFloat::opStatus ConvertStatus = FloatVal.convert( | ||||
396 | Ctx.getFloatTypeSemantics(ToType), | ||||
397 | llvm::APFloat::rmNearestTiesToEven, &ignored); | ||||
398 | // If there was no overflow, the source value is within the range of | ||||
399 | // values that can be represented. | ||||
400 | if (ConvertStatus & llvm::APFloat::opOverflow) { | ||||
401 | ConstantType = Initializer->getType(); | ||||
402 | return NK_Constant_Narrowing; | ||||
403 | } | ||||
404 | } else { | ||||
405 | return NK_Variable_Narrowing; | ||||
406 | } | ||||
407 | } | ||||
408 | return NK_Not_Narrowing; | ||||
409 | |||||
410 | // -- from an integer type or unscoped enumeration type to an integer type | ||||
411 | // that cannot represent all the values of the original type, except where | ||||
412 | // the source is a constant expression and the actual value after | ||||
413 | // conversion will fit into the target type and will produce the original | ||||
414 | // value when converted back to the original type. | ||||
415 | case ICK_Integral_Conversion: | ||||
416 | IntegralConversion: { | ||||
417 | assert(FromType->isIntegralOrUnscopedEnumerationType())((FromType->isIntegralOrUnscopedEnumerationType()) ? static_cast <void> (0) : __assert_fail ("FromType->isIntegralOrUnscopedEnumerationType()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 417, __PRETTY_FUNCTION__)); | ||||
418 | assert(ToType->isIntegralOrUnscopedEnumerationType())((ToType->isIntegralOrUnscopedEnumerationType()) ? static_cast <void> (0) : __assert_fail ("ToType->isIntegralOrUnscopedEnumerationType()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 418, __PRETTY_FUNCTION__)); | ||||
419 | const bool FromSigned = FromType->isSignedIntegerOrEnumerationType(); | ||||
420 | const unsigned FromWidth = Ctx.getIntWidth(FromType); | ||||
421 | const bool ToSigned = ToType->isSignedIntegerOrEnumerationType(); | ||||
422 | const unsigned ToWidth = Ctx.getIntWidth(ToType); | ||||
423 | |||||
424 | if (FromWidth > ToWidth || | ||||
425 | (FromWidth == ToWidth && FromSigned != ToSigned) || | ||||
426 | (FromSigned && !ToSigned)) { | ||||
427 | // Not all values of FromType can be represented in ToType. | ||||
428 | llvm::APSInt InitializerValue; | ||||
429 | const Expr *Initializer = IgnoreNarrowingConversion(Ctx, Converted); | ||||
430 | |||||
431 | // If it's value-dependent, we can't tell whether it's narrowing. | ||||
432 | if (Initializer->isValueDependent()) | ||||
433 | return NK_Dependent_Narrowing; | ||||
434 | |||||
435 | if (!Initializer->isIntegerConstantExpr(InitializerValue, Ctx)) { | ||||
436 | // Such conversions on variables are always narrowing. | ||||
437 | return NK_Variable_Narrowing; | ||||
438 | } | ||||
439 | bool Narrowing = false; | ||||
440 | if (FromWidth < ToWidth) { | ||||
441 | // Negative -> unsigned is narrowing. Otherwise, more bits is never | ||||
442 | // narrowing. | ||||
443 | if (InitializerValue.isSigned() && InitializerValue.isNegative()) | ||||
444 | Narrowing = true; | ||||
445 | } else { | ||||
446 | // Add a bit to the InitializerValue so we don't have to worry about | ||||
447 | // signed vs. unsigned comparisons. | ||||
448 | InitializerValue = InitializerValue.extend( | ||||
449 | InitializerValue.getBitWidth() + 1); | ||||
450 | // Convert the initializer to and from the target width and signed-ness. | ||||
451 | llvm::APSInt ConvertedValue = InitializerValue; | ||||
452 | ConvertedValue = ConvertedValue.trunc(ToWidth); | ||||
453 | ConvertedValue.setIsSigned(ToSigned); | ||||
454 | ConvertedValue = ConvertedValue.extend(InitializerValue.getBitWidth()); | ||||
455 | ConvertedValue.setIsSigned(InitializerValue.isSigned()); | ||||
456 | // If the result is different, this was a narrowing conversion. | ||||
457 | if (ConvertedValue != InitializerValue) | ||||
458 | Narrowing = true; | ||||
459 | } | ||||
460 | if (Narrowing) { | ||||
461 | ConstantType = Initializer->getType(); | ||||
462 | ConstantValue = APValue(InitializerValue); | ||||
463 | return NK_Constant_Narrowing; | ||||
464 | } | ||||
465 | } | ||||
466 | return NK_Not_Narrowing; | ||||
467 | } | ||||
468 | |||||
469 | default: | ||||
470 | // Other kinds of conversions are not narrowings. | ||||
471 | return NK_Not_Narrowing; | ||||
472 | } | ||||
473 | } | ||||
474 | |||||
475 | /// dump - Print this standard conversion sequence to standard | ||||
476 | /// error. Useful for debugging overloading issues. | ||||
477 | LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void StandardConversionSequence::dump() const { | ||||
478 | raw_ostream &OS = llvm::errs(); | ||||
479 | bool PrintedSomething = false; | ||||
480 | if (First != ICK_Identity) { | ||||
481 | OS << GetImplicitConversionName(First); | ||||
482 | PrintedSomething = true; | ||||
483 | } | ||||
484 | |||||
485 | if (Second != ICK_Identity) { | ||||
486 | if (PrintedSomething) { | ||||
487 | OS << " -> "; | ||||
488 | } | ||||
489 | OS << GetImplicitConversionName(Second); | ||||
490 | |||||
491 | if (CopyConstructor) { | ||||
492 | OS << " (by copy constructor)"; | ||||
493 | } else if (DirectBinding) { | ||||
494 | OS << " (direct reference binding)"; | ||||
495 | } else if (ReferenceBinding) { | ||||
496 | OS << " (reference binding)"; | ||||
497 | } | ||||
498 | PrintedSomething = true; | ||||
499 | } | ||||
500 | |||||
501 | if (Third != ICK_Identity) { | ||||
502 | if (PrintedSomething) { | ||||
503 | OS << " -> "; | ||||
504 | } | ||||
505 | OS << GetImplicitConversionName(Third); | ||||
506 | PrintedSomething = true; | ||||
507 | } | ||||
508 | |||||
509 | if (!PrintedSomething) { | ||||
510 | OS << "No conversions required"; | ||||
511 | } | ||||
512 | } | ||||
513 | |||||
514 | /// dump - Print this user-defined conversion sequence to standard | ||||
515 | /// error. Useful for debugging overloading issues. | ||||
516 | void UserDefinedConversionSequence::dump() const { | ||||
517 | raw_ostream &OS = llvm::errs(); | ||||
518 | if (Before.First || Before.Second || Before.Third) { | ||||
519 | Before.dump(); | ||||
520 | OS << " -> "; | ||||
521 | } | ||||
522 | if (ConversionFunction) | ||||
523 | OS << '\'' << *ConversionFunction << '\''; | ||||
524 | else | ||||
525 | OS << "aggregate initialization"; | ||||
526 | if (After.First || After.Second || After.Third) { | ||||
527 | OS << " -> "; | ||||
528 | After.dump(); | ||||
529 | } | ||||
530 | } | ||||
531 | |||||
532 | /// dump - Print this implicit conversion sequence to standard | ||||
533 | /// error. Useful for debugging overloading issues. | ||||
534 | void ImplicitConversionSequence::dump() const { | ||||
535 | raw_ostream &OS = llvm::errs(); | ||||
536 | if (isStdInitializerListElement()) | ||||
537 | OS << "Worst std::initializer_list element conversion: "; | ||||
538 | switch (ConversionKind) { | ||||
539 | case StandardConversion: | ||||
540 | OS << "Standard conversion: "; | ||||
541 | Standard.dump(); | ||||
542 | break; | ||||
543 | case UserDefinedConversion: | ||||
544 | OS << "User-defined conversion: "; | ||||
545 | UserDefined.dump(); | ||||
546 | break; | ||||
547 | case EllipsisConversion: | ||||
548 | OS << "Ellipsis conversion"; | ||||
549 | break; | ||||
550 | case AmbiguousConversion: | ||||
551 | OS << "Ambiguous conversion"; | ||||
552 | break; | ||||
553 | case BadConversion: | ||||
554 | OS << "Bad conversion"; | ||||
555 | break; | ||||
556 | } | ||||
557 | |||||
558 | OS << "\n"; | ||||
559 | } | ||||
560 | |||||
561 | void AmbiguousConversionSequence::construct() { | ||||
562 | new (&conversions()) ConversionSet(); | ||||
563 | } | ||||
564 | |||||
565 | void AmbiguousConversionSequence::destruct() { | ||||
566 | conversions().~ConversionSet(); | ||||
567 | } | ||||
568 | |||||
569 | void | ||||
570 | AmbiguousConversionSequence::copyFrom(const AmbiguousConversionSequence &O) { | ||||
571 | FromTypePtr = O.FromTypePtr; | ||||
572 | ToTypePtr = O.ToTypePtr; | ||||
573 | new (&conversions()) ConversionSet(O.conversions()); | ||||
574 | } | ||||
575 | |||||
576 | namespace { | ||||
577 | // Structure used by DeductionFailureInfo to store | ||||
578 | // template argument information. | ||||
579 | struct DFIArguments { | ||||
580 | TemplateArgument FirstArg; | ||||
581 | TemplateArgument SecondArg; | ||||
582 | }; | ||||
583 | // Structure used by DeductionFailureInfo to store | ||||
584 | // template parameter and template argument information. | ||||
585 | struct DFIParamWithArguments : DFIArguments { | ||||
586 | TemplateParameter Param; | ||||
587 | }; | ||||
588 | // Structure used by DeductionFailureInfo to store template argument | ||||
589 | // information and the index of the problematic call argument. | ||||
590 | struct DFIDeducedMismatchArgs : DFIArguments { | ||||
591 | TemplateArgumentList *TemplateArgs; | ||||
592 | unsigned CallArgIndex; | ||||
593 | }; | ||||
594 | } | ||||
595 | |||||
596 | /// Convert from Sema's representation of template deduction information | ||||
597 | /// to the form used in overload-candidate information. | ||||
598 | DeductionFailureInfo | ||||
599 | clang::MakeDeductionFailureInfo(ASTContext &Context, | ||||
600 | Sema::TemplateDeductionResult TDK, | ||||
601 | TemplateDeductionInfo &Info) { | ||||
602 | DeductionFailureInfo Result; | ||||
603 | Result.Result = static_cast<unsigned>(TDK); | ||||
604 | Result.HasDiagnostic = false; | ||||
605 | switch (TDK) { | ||||
606 | case Sema::TDK_Invalid: | ||||
607 | case Sema::TDK_InstantiationDepth: | ||||
608 | case Sema::TDK_TooManyArguments: | ||||
609 | case Sema::TDK_TooFewArguments: | ||||
610 | case Sema::TDK_MiscellaneousDeductionFailure: | ||||
611 | case Sema::TDK_CUDATargetMismatch: | ||||
612 | Result.Data = nullptr; | ||||
613 | break; | ||||
614 | |||||
615 | case Sema::TDK_Incomplete: | ||||
616 | case Sema::TDK_InvalidExplicitArguments: | ||||
617 | Result.Data = Info.Param.getOpaqueValue(); | ||||
618 | break; | ||||
619 | |||||
620 | case Sema::TDK_DeducedMismatch: | ||||
621 | case Sema::TDK_DeducedMismatchNested: { | ||||
622 | // FIXME: Should allocate from normal heap so that we can free this later. | ||||
623 | auto *Saved = new (Context) DFIDeducedMismatchArgs; | ||||
624 | Saved->FirstArg = Info.FirstArg; | ||||
625 | Saved->SecondArg = Info.SecondArg; | ||||
626 | Saved->TemplateArgs = Info.take(); | ||||
627 | Saved->CallArgIndex = Info.CallArgIndex; | ||||
628 | Result.Data = Saved; | ||||
629 | break; | ||||
630 | } | ||||
631 | |||||
632 | case Sema::TDK_NonDeducedMismatch: { | ||||
633 | // FIXME: Should allocate from normal heap so that we can free this later. | ||||
634 | DFIArguments *Saved = new (Context) DFIArguments; | ||||
635 | Saved->FirstArg = Info.FirstArg; | ||||
636 | Saved->SecondArg = Info.SecondArg; | ||||
637 | Result.Data = Saved; | ||||
638 | break; | ||||
639 | } | ||||
640 | |||||
641 | case Sema::TDK_IncompletePack: | ||||
642 | // FIXME: It's slightly wasteful to allocate two TemplateArguments for this. | ||||
643 | case Sema::TDK_Inconsistent: | ||||
644 | case Sema::TDK_Underqualified: { | ||||
645 | // FIXME: Should allocate from normal heap so that we can free this later. | ||||
646 | DFIParamWithArguments *Saved = new (Context) DFIParamWithArguments; | ||||
647 | Saved->Param = Info.Param; | ||||
648 | Saved->FirstArg = Info.FirstArg; | ||||
649 | Saved->SecondArg = Info.SecondArg; | ||||
650 | Result.Data = Saved; | ||||
651 | break; | ||||
652 | } | ||||
653 | |||||
654 | case Sema::TDK_SubstitutionFailure: | ||||
655 | Result.Data = Info.take(); | ||||
656 | if (Info.hasSFINAEDiagnostic()) { | ||||
657 | PartialDiagnosticAt *Diag = new (Result.Diagnostic) PartialDiagnosticAt( | ||||
658 | SourceLocation(), PartialDiagnostic::NullDiagnostic()); | ||||
659 | Info.takeSFINAEDiagnostic(*Diag); | ||||
660 | Result.HasDiagnostic = true; | ||||
661 | } | ||||
662 | break; | ||||
663 | |||||
664 | case Sema::TDK_Success: | ||||
665 | case Sema::TDK_NonDependentConversionFailure: | ||||
666 | llvm_unreachable("not a deduction failure")::llvm::llvm_unreachable_internal("not a deduction failure", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 666); | ||||
667 | } | ||||
668 | |||||
669 | return Result; | ||||
670 | } | ||||
671 | |||||
672 | void DeductionFailureInfo::Destroy() { | ||||
673 | switch (static_cast<Sema::TemplateDeductionResult>(Result)) { | ||||
674 | case Sema::TDK_Success: | ||||
675 | case Sema::TDK_Invalid: | ||||
676 | case Sema::TDK_InstantiationDepth: | ||||
677 | case Sema::TDK_Incomplete: | ||||
678 | case Sema::TDK_TooManyArguments: | ||||
679 | case Sema::TDK_TooFewArguments: | ||||
680 | case Sema::TDK_InvalidExplicitArguments: | ||||
681 | case Sema::TDK_CUDATargetMismatch: | ||||
682 | case Sema::TDK_NonDependentConversionFailure: | ||||
683 | break; | ||||
684 | |||||
685 | case Sema::TDK_IncompletePack: | ||||
686 | case Sema::TDK_Inconsistent: | ||||
687 | case Sema::TDK_Underqualified: | ||||
688 | case Sema::TDK_DeducedMismatch: | ||||
689 | case Sema::TDK_DeducedMismatchNested: | ||||
690 | case Sema::TDK_NonDeducedMismatch: | ||||
691 | // FIXME: Destroy the data? | ||||
692 | Data = nullptr; | ||||
693 | break; | ||||
694 | |||||
695 | case Sema::TDK_SubstitutionFailure: | ||||
696 | // FIXME: Destroy the template argument list? | ||||
697 | Data = nullptr; | ||||
698 | if (PartialDiagnosticAt *Diag = getSFINAEDiagnostic()) { | ||||
699 | Diag->~PartialDiagnosticAt(); | ||||
700 | HasDiagnostic = false; | ||||
701 | } | ||||
702 | break; | ||||
703 | |||||
704 | // Unhandled | ||||
705 | case Sema::TDK_MiscellaneousDeductionFailure: | ||||
706 | break; | ||||
707 | } | ||||
708 | } | ||||
709 | |||||
710 | PartialDiagnosticAt *DeductionFailureInfo::getSFINAEDiagnostic() { | ||||
711 | if (HasDiagnostic) | ||||
712 | return static_cast<PartialDiagnosticAt*>(static_cast<void*>(Diagnostic)); | ||||
713 | return nullptr; | ||||
714 | } | ||||
715 | |||||
716 | TemplateParameter DeductionFailureInfo::getTemplateParameter() { | ||||
717 | switch (static_cast<Sema::TemplateDeductionResult>(Result)) { | ||||
718 | case Sema::TDK_Success: | ||||
719 | case Sema::TDK_Invalid: | ||||
720 | case Sema::TDK_InstantiationDepth: | ||||
721 | case Sema::TDK_TooManyArguments: | ||||
722 | case Sema::TDK_TooFewArguments: | ||||
723 | case Sema::TDK_SubstitutionFailure: | ||||
724 | case Sema::TDK_DeducedMismatch: | ||||
725 | case Sema::TDK_DeducedMismatchNested: | ||||
726 | case Sema::TDK_NonDeducedMismatch: | ||||
727 | case Sema::TDK_CUDATargetMismatch: | ||||
728 | case Sema::TDK_NonDependentConversionFailure: | ||||
729 | return TemplateParameter(); | ||||
730 | |||||
731 | case Sema::TDK_Incomplete: | ||||
732 | case Sema::TDK_InvalidExplicitArguments: | ||||
733 | return TemplateParameter::getFromOpaqueValue(Data); | ||||
734 | |||||
735 | case Sema::TDK_IncompletePack: | ||||
736 | case Sema::TDK_Inconsistent: | ||||
737 | case Sema::TDK_Underqualified: | ||||
738 | return static_cast<DFIParamWithArguments*>(Data)->Param; | ||||
739 | |||||
740 | // Unhandled | ||||
741 | case Sema::TDK_MiscellaneousDeductionFailure: | ||||
742 | break; | ||||
743 | } | ||||
744 | |||||
745 | return TemplateParameter(); | ||||
746 | } | ||||
747 | |||||
748 | TemplateArgumentList *DeductionFailureInfo::getTemplateArgumentList() { | ||||
749 | switch (static_cast<Sema::TemplateDeductionResult>(Result)) { | ||||
750 | case Sema::TDK_Success: | ||||
751 | case Sema::TDK_Invalid: | ||||
752 | case Sema::TDK_InstantiationDepth: | ||||
753 | case Sema::TDK_TooManyArguments: | ||||
754 | case Sema::TDK_TooFewArguments: | ||||
755 | case Sema::TDK_Incomplete: | ||||
756 | case Sema::TDK_IncompletePack: | ||||
757 | case Sema::TDK_InvalidExplicitArguments: | ||||
758 | case Sema::TDK_Inconsistent: | ||||
759 | case Sema::TDK_Underqualified: | ||||
760 | case Sema::TDK_NonDeducedMismatch: | ||||
761 | case Sema::TDK_CUDATargetMismatch: | ||||
762 | case Sema::TDK_NonDependentConversionFailure: | ||||
763 | return nullptr; | ||||
764 | |||||
765 | case Sema::TDK_DeducedMismatch: | ||||
766 | case Sema::TDK_DeducedMismatchNested: | ||||
767 | return static_cast<DFIDeducedMismatchArgs*>(Data)->TemplateArgs; | ||||
768 | |||||
769 | case Sema::TDK_SubstitutionFailure: | ||||
770 | return static_cast<TemplateArgumentList*>(Data); | ||||
771 | |||||
772 | // Unhandled | ||||
773 | case Sema::TDK_MiscellaneousDeductionFailure: | ||||
774 | break; | ||||
775 | } | ||||
776 | |||||
777 | return nullptr; | ||||
778 | } | ||||
779 | |||||
780 | const TemplateArgument *DeductionFailureInfo::getFirstArg() { | ||||
781 | switch (static_cast<Sema::TemplateDeductionResult>(Result)) { | ||||
782 | case Sema::TDK_Success: | ||||
783 | case Sema::TDK_Invalid: | ||||
784 | case Sema::TDK_InstantiationDepth: | ||||
785 | case Sema::TDK_Incomplete: | ||||
786 | case Sema::TDK_TooManyArguments: | ||||
787 | case Sema::TDK_TooFewArguments: | ||||
788 | case Sema::TDK_InvalidExplicitArguments: | ||||
789 | case Sema::TDK_SubstitutionFailure: | ||||
790 | case Sema::TDK_CUDATargetMismatch: | ||||
791 | case Sema::TDK_NonDependentConversionFailure: | ||||
792 | return nullptr; | ||||
793 | |||||
794 | case Sema::TDK_IncompletePack: | ||||
795 | case Sema::TDK_Inconsistent: | ||||
796 | case Sema::TDK_Underqualified: | ||||
797 | case Sema::TDK_DeducedMismatch: | ||||
798 | case Sema::TDK_DeducedMismatchNested: | ||||
799 | case Sema::TDK_NonDeducedMismatch: | ||||
800 | return &static_cast<DFIArguments*>(Data)->FirstArg; | ||||
801 | |||||
802 | // Unhandled | ||||
803 | case Sema::TDK_MiscellaneousDeductionFailure: | ||||
804 | break; | ||||
805 | } | ||||
806 | |||||
807 | return nullptr; | ||||
808 | } | ||||
809 | |||||
810 | const TemplateArgument *DeductionFailureInfo::getSecondArg() { | ||||
811 | switch (static_cast<Sema::TemplateDeductionResult>(Result)) { | ||||
812 | case Sema::TDK_Success: | ||||
813 | case Sema::TDK_Invalid: | ||||
814 | case Sema::TDK_InstantiationDepth: | ||||
815 | case Sema::TDK_Incomplete: | ||||
816 | case Sema::TDK_IncompletePack: | ||||
817 | case Sema::TDK_TooManyArguments: | ||||
818 | case Sema::TDK_TooFewArguments: | ||||
819 | case Sema::TDK_InvalidExplicitArguments: | ||||
820 | case Sema::TDK_SubstitutionFailure: | ||||
821 | case Sema::TDK_CUDATargetMismatch: | ||||
822 | case Sema::TDK_NonDependentConversionFailure: | ||||
823 | return nullptr; | ||||
824 | |||||
825 | case Sema::TDK_Inconsistent: | ||||
826 | case Sema::TDK_Underqualified: | ||||
827 | case Sema::TDK_DeducedMismatch: | ||||
828 | case Sema::TDK_DeducedMismatchNested: | ||||
829 | case Sema::TDK_NonDeducedMismatch: | ||||
830 | return &static_cast<DFIArguments*>(Data)->SecondArg; | ||||
831 | |||||
832 | // Unhandled | ||||
833 | case Sema::TDK_MiscellaneousDeductionFailure: | ||||
834 | break; | ||||
835 | } | ||||
836 | |||||
837 | return nullptr; | ||||
838 | } | ||||
839 | |||||
840 | llvm::Optional<unsigned> DeductionFailureInfo::getCallArgIndex() { | ||||
841 | switch (static_cast<Sema::TemplateDeductionResult>(Result)) { | ||||
842 | case Sema::TDK_DeducedMismatch: | ||||
843 | case Sema::TDK_DeducedMismatchNested: | ||||
844 | return static_cast<DFIDeducedMismatchArgs*>(Data)->CallArgIndex; | ||||
845 | |||||
846 | default: | ||||
847 | return llvm::None; | ||||
848 | } | ||||
849 | } | ||||
850 | |||||
851 | void OverloadCandidateSet::destroyCandidates() { | ||||
852 | for (iterator i = begin(), e = end(); i != e; ++i) { | ||||
853 | for (auto &C : i->Conversions) | ||||
854 | C.~ImplicitConversionSequence(); | ||||
855 | if (!i->Viable && i->FailureKind == ovl_fail_bad_deduction) | ||||
856 | i->DeductionFailure.Destroy(); | ||||
857 | } | ||||
858 | } | ||||
859 | |||||
860 | void OverloadCandidateSet::clear(CandidateSetKind CSK) { | ||||
861 | destroyCandidates(); | ||||
862 | SlabAllocator.Reset(); | ||||
863 | NumInlineBytesUsed = 0; | ||||
864 | Candidates.clear(); | ||||
865 | Functions.clear(); | ||||
866 | Kind = CSK; | ||||
867 | } | ||||
868 | |||||
869 | namespace { | ||||
870 | class UnbridgedCastsSet { | ||||
871 | struct Entry { | ||||
872 | Expr **Addr; | ||||
873 | Expr *Saved; | ||||
874 | }; | ||||
875 | SmallVector<Entry, 2> Entries; | ||||
876 | |||||
877 | public: | ||||
878 | void save(Sema &S, Expr *&E) { | ||||
879 | assert(E->hasPlaceholderType(BuiltinType::ARCUnbridgedCast))((E->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)) ? static_cast <void> (0) : __assert_fail ("E->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 879, __PRETTY_FUNCTION__)); | ||||
880 | Entry entry = { &E, E }; | ||||
881 | Entries.push_back(entry); | ||||
882 | E = S.stripARCUnbridgedCast(E); | ||||
883 | } | ||||
884 | |||||
885 | void restore() { | ||||
886 | for (SmallVectorImpl<Entry>::iterator | ||||
887 | i = Entries.begin(), e = Entries.end(); i != e; ++i) | ||||
888 | *i->Addr = i->Saved; | ||||
889 | } | ||||
890 | }; | ||||
891 | } | ||||
892 | |||||
893 | /// checkPlaceholderForOverload - Do any interesting placeholder-like | ||||
894 | /// preprocessing on the given expression. | ||||
895 | /// | ||||
896 | /// \param unbridgedCasts a collection to which to add unbridged casts; | ||||
897 | /// without this, they will be immediately diagnosed as errors | ||||
898 | /// | ||||
899 | /// Return true on unrecoverable error. | ||||
900 | static bool | ||||
901 | checkPlaceholderForOverload(Sema &S, Expr *&E, | ||||
902 | UnbridgedCastsSet *unbridgedCasts = nullptr) { | ||||
903 | if (const BuiltinType *placeholder = E->getType()->getAsPlaceholderType()) { | ||||
904 | // We can't handle overloaded expressions here because overload | ||||
905 | // resolution might reasonably tweak them. | ||||
906 | if (placeholder->getKind() == BuiltinType::Overload) return false; | ||||
907 | |||||
908 | // If the context potentially accepts unbridged ARC casts, strip | ||||
909 | // the unbridged cast and add it to the collection for later restoration. | ||||
910 | if (placeholder->getKind() == BuiltinType::ARCUnbridgedCast && | ||||
911 | unbridgedCasts) { | ||||
912 | unbridgedCasts->save(S, E); | ||||
913 | return false; | ||||
914 | } | ||||
915 | |||||
916 | // Go ahead and check everything else. | ||||
917 | ExprResult result = S.CheckPlaceholderExpr(E); | ||||
918 | if (result.isInvalid()) | ||||
919 | return true; | ||||
920 | |||||
921 | E = result.get(); | ||||
922 | return false; | ||||
923 | } | ||||
924 | |||||
925 | // Nothing to do. | ||||
926 | return false; | ||||
927 | } | ||||
928 | |||||
929 | /// checkArgPlaceholdersForOverload - Check a set of call operands for | ||||
930 | /// placeholders. | ||||
931 | static bool checkArgPlaceholdersForOverload(Sema &S, | ||||
932 | MultiExprArg Args, | ||||
933 | UnbridgedCastsSet &unbridged) { | ||||
934 | for (unsigned i = 0, e = Args.size(); i != e; ++i) | ||||
935 | if (checkPlaceholderForOverload(S, Args[i], &unbridged)) | ||||
936 | return true; | ||||
937 | |||||
938 | return false; | ||||
939 | } | ||||
940 | |||||
941 | /// Determine whether the given New declaration is an overload of the | ||||
942 | /// declarations in Old. This routine returns Ovl_Match or Ovl_NonFunction if | ||||
943 | /// New and Old cannot be overloaded, e.g., if New has the same signature as | ||||
944 | /// some function in Old (C++ 1.3.10) or if the Old declarations aren't | ||||
945 | /// functions (or function templates) at all. When it does return Ovl_Match or | ||||
946 | /// Ovl_NonFunction, MatchedDecl will point to the decl that New cannot be | ||||
947 | /// overloaded with. This decl may be a UsingShadowDecl on top of the underlying | ||||
948 | /// declaration. | ||||
949 | /// | ||||
950 | /// Example: Given the following input: | ||||
951 | /// | ||||
952 | /// void f(int, float); // #1 | ||||
953 | /// void f(int, int); // #2 | ||||
954 | /// int f(int, int); // #3 | ||||
955 | /// | ||||
956 | /// When we process #1, there is no previous declaration of "f", so IsOverload | ||||
957 | /// will not be used. | ||||
958 | /// | ||||
959 | /// When we process #2, Old contains only the FunctionDecl for #1. By comparing | ||||
960 | /// the parameter types, we see that #1 and #2 are overloaded (since they have | ||||
961 | /// different signatures), so this routine returns Ovl_Overload; MatchedDecl is | ||||
962 | /// unchanged. | ||||
963 | /// | ||||
964 | /// When we process #3, Old is an overload set containing #1 and #2. We compare | ||||
965 | /// the signatures of #3 to #1 (they're overloaded, so we do nothing) and then | ||||
966 | /// #3 to #2. Since the signatures of #3 and #2 are identical (return types of | ||||
967 | /// functions are not part of the signature), IsOverload returns Ovl_Match and | ||||
968 | /// MatchedDecl will be set to point to the FunctionDecl for #2. | ||||
969 | /// | ||||
970 | /// 'NewIsUsingShadowDecl' indicates that 'New' is being introduced into a class | ||||
971 | /// by a using declaration. The rules for whether to hide shadow declarations | ||||
972 | /// ignore some properties which otherwise figure into a function template's | ||||
973 | /// signature. | ||||
974 | Sema::OverloadKind | ||||
975 | Sema::CheckOverload(Scope *S, FunctionDecl *New, const LookupResult &Old, | ||||
976 | NamedDecl *&Match, bool NewIsUsingDecl) { | ||||
977 | for (LookupResult::iterator I = Old.begin(), E = Old.end(); | ||||
978 | I != E; ++I) { | ||||
979 | NamedDecl *OldD = *I; | ||||
980 | |||||
981 | bool OldIsUsingDecl = false; | ||||
982 | if (isa<UsingShadowDecl>(OldD)) { | ||||
983 | OldIsUsingDecl = true; | ||||
984 | |||||
985 | // We can always introduce two using declarations into the same | ||||
986 | // context, even if they have identical signatures. | ||||
987 | if (NewIsUsingDecl) continue; | ||||
988 | |||||
989 | OldD = cast<UsingShadowDecl>(OldD)->getTargetDecl(); | ||||
990 | } | ||||
991 | |||||
992 | // A using-declaration does not conflict with another declaration | ||||
993 | // if one of them is hidden. | ||||
994 | if ((OldIsUsingDecl || NewIsUsingDecl) && !isVisible(*I)) | ||||
995 | continue; | ||||
996 | |||||
997 | // If either declaration was introduced by a using declaration, | ||||
998 | // we'll need to use slightly different rules for matching. | ||||
999 | // Essentially, these rules are the normal rules, except that | ||||
1000 | // function templates hide function templates with different | ||||
1001 | // return types or template parameter lists. | ||||
1002 | bool UseMemberUsingDeclRules = | ||||
1003 | (OldIsUsingDecl || NewIsUsingDecl) && CurContext->isRecord() && | ||||
1004 | !New->getFriendObjectKind(); | ||||
1005 | |||||
1006 | if (FunctionDecl *OldF = OldD->getAsFunction()) { | ||||
1007 | if (!IsOverload(New, OldF, UseMemberUsingDeclRules)) { | ||||
1008 | if (UseMemberUsingDeclRules && OldIsUsingDecl) { | ||||
1009 | HideUsingShadowDecl(S, cast<UsingShadowDecl>(*I)); | ||||
1010 | continue; | ||||
1011 | } | ||||
1012 | |||||
1013 | if (!isa<FunctionTemplateDecl>(OldD) && | ||||
1014 | !shouldLinkPossiblyHiddenDecl(*I, New)) | ||||
1015 | continue; | ||||
1016 | |||||
1017 | Match = *I; | ||||
1018 | return Ovl_Match; | ||||
1019 | } | ||||
1020 | |||||
1021 | // Builtins that have custom typechecking or have a reference should | ||||
1022 | // not be overloadable or redeclarable. | ||||
1023 | if (!getASTContext().canBuiltinBeRedeclared(OldF)) { | ||||
1024 | Match = *I; | ||||
1025 | return Ovl_NonFunction; | ||||
1026 | } | ||||
1027 | } else if (isa<UsingDecl>(OldD) || isa<UsingPackDecl>(OldD)) { | ||||
1028 | // We can overload with these, which can show up when doing | ||||
1029 | // redeclaration checks for UsingDecls. | ||||
1030 | assert(Old.getLookupKind() == LookupUsingDeclName)((Old.getLookupKind() == LookupUsingDeclName) ? static_cast< void> (0) : __assert_fail ("Old.getLookupKind() == LookupUsingDeclName" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1030, __PRETTY_FUNCTION__)); | ||||
1031 | } else if (isa<TagDecl>(OldD)) { | ||||
1032 | // We can always overload with tags by hiding them. | ||||
1033 | } else if (auto *UUD = dyn_cast<UnresolvedUsingValueDecl>(OldD)) { | ||||
1034 | // Optimistically assume that an unresolved using decl will | ||||
1035 | // overload; if it doesn't, we'll have to diagnose during | ||||
1036 | // template instantiation. | ||||
1037 | // | ||||
1038 | // Exception: if the scope is dependent and this is not a class | ||||
1039 | // member, the using declaration can only introduce an enumerator. | ||||
1040 | if (UUD->getQualifier()->isDependent() && !UUD->isCXXClassMember()) { | ||||
1041 | Match = *I; | ||||
1042 | return Ovl_NonFunction; | ||||
1043 | } | ||||
1044 | } else { | ||||
1045 | // (C++ 13p1): | ||||
1046 | // Only function declarations can be overloaded; object and type | ||||
1047 | // declarations cannot be overloaded. | ||||
1048 | Match = *I; | ||||
1049 | return Ovl_NonFunction; | ||||
1050 | } | ||||
1051 | } | ||||
1052 | |||||
1053 | // C++ [temp.friend]p1: | ||||
1054 | // For a friend function declaration that is not a template declaration: | ||||
1055 | // -- if the name of the friend is a qualified or unqualified template-id, | ||||
1056 | // [...], otherwise | ||||
1057 | // -- if the name of the friend is a qualified-id and a matching | ||||
1058 | // non-template function is found in the specified class or namespace, | ||||
1059 | // the friend declaration refers to that function, otherwise, | ||||
1060 | // -- if the name of the friend is a qualified-id and a matching function | ||||
1061 | // template is found in the specified class or namespace, the friend | ||||
1062 | // declaration refers to the deduced specialization of that function | ||||
1063 | // template, otherwise | ||||
1064 | // -- the name shall be an unqualified-id [...] | ||||
1065 | // If we get here for a qualified friend declaration, we've just reached the | ||||
1066 | // third bullet. If the type of the friend is dependent, skip this lookup | ||||
1067 | // until instantiation. | ||||
1068 | if (New->getFriendObjectKind() && New->getQualifier() && | ||||
1069 | !New->getDescribedFunctionTemplate() && | ||||
1070 | !New->getDependentSpecializationInfo() && | ||||
1071 | !New->getType()->isDependentType()) { | ||||
1072 | LookupResult TemplateSpecResult(LookupResult::Temporary, Old); | ||||
1073 | TemplateSpecResult.addAllDecls(Old); | ||||
1074 | if (CheckFunctionTemplateSpecialization(New, nullptr, TemplateSpecResult, | ||||
1075 | /*QualifiedFriend*/true)) { | ||||
1076 | New->setInvalidDecl(); | ||||
1077 | return Ovl_Overload; | ||||
1078 | } | ||||
1079 | |||||
1080 | Match = TemplateSpecResult.getAsSingle<FunctionDecl>(); | ||||
1081 | return Ovl_Match; | ||||
1082 | } | ||||
1083 | |||||
1084 | return Ovl_Overload; | ||||
1085 | } | ||||
1086 | |||||
1087 | bool Sema::IsOverload(FunctionDecl *New, FunctionDecl *Old, | ||||
1088 | bool UseMemberUsingDeclRules, bool ConsiderCudaAttrs) { | ||||
1089 | // C++ [basic.start.main]p2: This function shall not be overloaded. | ||||
1090 | if (New->isMain()) | ||||
1091 | return false; | ||||
1092 | |||||
1093 | // MSVCRT user defined entry points cannot be overloaded. | ||||
1094 | if (New->isMSVCRTEntryPoint()) | ||||
1095 | return false; | ||||
1096 | |||||
1097 | FunctionTemplateDecl *OldTemplate = Old->getDescribedFunctionTemplate(); | ||||
1098 | FunctionTemplateDecl *NewTemplate = New->getDescribedFunctionTemplate(); | ||||
1099 | |||||
1100 | // C++ [temp.fct]p2: | ||||
1101 | // A function template can be overloaded with other function templates | ||||
1102 | // and with normal (non-template) functions. | ||||
1103 | if ((OldTemplate == nullptr) != (NewTemplate == nullptr)) | ||||
1104 | return true; | ||||
1105 | |||||
1106 | // Is the function New an overload of the function Old? | ||||
1107 | QualType OldQType = Context.getCanonicalType(Old->getType()); | ||||
1108 | QualType NewQType = Context.getCanonicalType(New->getType()); | ||||
1109 | |||||
1110 | // Compare the signatures (C++ 1.3.10) of the two functions to | ||||
1111 | // determine whether they are overloads. If we find any mismatch | ||||
1112 | // in the signature, they are overloads. | ||||
1113 | |||||
1114 | // If either of these functions is a K&R-style function (no | ||||
1115 | // prototype), then we consider them to have matching signatures. | ||||
1116 | if (isa<FunctionNoProtoType>(OldQType.getTypePtr()) || | ||||
1117 | isa<FunctionNoProtoType>(NewQType.getTypePtr())) | ||||
1118 | return false; | ||||
1119 | |||||
1120 | const FunctionProtoType *OldType = cast<FunctionProtoType>(OldQType); | ||||
1121 | const FunctionProtoType *NewType = cast<FunctionProtoType>(NewQType); | ||||
1122 | |||||
1123 | // The signature of a function includes the types of its | ||||
1124 | // parameters (C++ 1.3.10), which includes the presence or absence | ||||
1125 | // of the ellipsis; see C++ DR 357). | ||||
1126 | if (OldQType != NewQType && | ||||
1127 | (OldType->getNumParams() != NewType->getNumParams() || | ||||
1128 | OldType->isVariadic() != NewType->isVariadic() || | ||||
1129 | !FunctionParamTypesAreEqual(OldType, NewType))) | ||||
1130 | return true; | ||||
1131 | |||||
1132 | // C++ [temp.over.link]p4: | ||||
1133 | // The signature of a function template consists of its function | ||||
1134 | // signature, its return type and its template parameter list. The names | ||||
1135 | // of the template parameters are significant only for establishing the | ||||
1136 | // relationship between the template parameters and the rest of the | ||||
1137 | // signature. | ||||
1138 | // | ||||
1139 | // We check the return type and template parameter lists for function | ||||
1140 | // templates first; the remaining checks follow. | ||||
1141 | // | ||||
1142 | // However, we don't consider either of these when deciding whether | ||||
1143 | // a member introduced by a shadow declaration is hidden. | ||||
1144 | if (!UseMemberUsingDeclRules && NewTemplate && | ||||
1145 | (!TemplateParameterListsAreEqual(NewTemplate->getTemplateParameters(), | ||||
1146 | OldTemplate->getTemplateParameters(), | ||||
1147 | false, TPL_TemplateMatch) || | ||||
1148 | !Context.hasSameType(Old->getDeclaredReturnType(), | ||||
1149 | New->getDeclaredReturnType()))) | ||||
1150 | return true; | ||||
1151 | |||||
1152 | // If the function is a class member, its signature includes the | ||||
1153 | // cv-qualifiers (if any) and ref-qualifier (if any) on the function itself. | ||||
1154 | // | ||||
1155 | // As part of this, also check whether one of the member functions | ||||
1156 | // is static, in which case they are not overloads (C++ | ||||
1157 | // 13.1p2). While not part of the definition of the signature, | ||||
1158 | // this check is important to determine whether these functions | ||||
1159 | // can be overloaded. | ||||
1160 | CXXMethodDecl *OldMethod = dyn_cast<CXXMethodDecl>(Old); | ||||
1161 | CXXMethodDecl *NewMethod = dyn_cast<CXXMethodDecl>(New); | ||||
1162 | if (OldMethod && NewMethod && | ||||
1163 | !OldMethod->isStatic() && !NewMethod->isStatic()) { | ||||
1164 | if (OldMethod->getRefQualifier() != NewMethod->getRefQualifier()) { | ||||
1165 | if (!UseMemberUsingDeclRules && | ||||
1166 | (OldMethod->getRefQualifier() == RQ_None || | ||||
1167 | NewMethod->getRefQualifier() == RQ_None)) { | ||||
1168 | // C++0x [over.load]p2: | ||||
1169 | // - Member function declarations with the same name and the same | ||||
1170 | // parameter-type-list as well as member function template | ||||
1171 | // declarations with the same name, the same parameter-type-list, and | ||||
1172 | // the same template parameter lists cannot be overloaded if any of | ||||
1173 | // them, but not all, have a ref-qualifier (8.3.5). | ||||
1174 | Diag(NewMethod->getLocation(), diag::err_ref_qualifier_overload) | ||||
1175 | << NewMethod->getRefQualifier() << OldMethod->getRefQualifier(); | ||||
1176 | Diag(OldMethod->getLocation(), diag::note_previous_declaration); | ||||
1177 | } | ||||
1178 | return true; | ||||
1179 | } | ||||
1180 | |||||
1181 | // We may not have applied the implicit const for a constexpr member | ||||
1182 | // function yet (because we haven't yet resolved whether this is a static | ||||
1183 | // or non-static member function). Add it now, on the assumption that this | ||||
1184 | // is a redeclaration of OldMethod. | ||||
1185 | auto OldQuals = OldMethod->getMethodQualifiers(); | ||||
1186 | auto NewQuals = NewMethod->getMethodQualifiers(); | ||||
1187 | if (!getLangOpts().CPlusPlus14 && NewMethod->isConstexpr() && | ||||
1188 | !isa<CXXConstructorDecl>(NewMethod)) | ||||
1189 | NewQuals.addConst(); | ||||
1190 | // We do not allow overloading based off of '__restrict'. | ||||
1191 | OldQuals.removeRestrict(); | ||||
1192 | NewQuals.removeRestrict(); | ||||
1193 | if (OldQuals != NewQuals) | ||||
1194 | return true; | ||||
1195 | } | ||||
1196 | |||||
1197 | // Though pass_object_size is placed on parameters and takes an argument, we | ||||
1198 | // consider it to be a function-level modifier for the sake of function | ||||
1199 | // identity. Either the function has one or more parameters with | ||||
1200 | // pass_object_size or it doesn't. | ||||
1201 | if (functionHasPassObjectSizeParams(New) != | ||||
1202 | functionHasPassObjectSizeParams(Old)) | ||||
1203 | return true; | ||||
1204 | |||||
1205 | // enable_if attributes are an order-sensitive part of the signature. | ||||
1206 | for (specific_attr_iterator<EnableIfAttr> | ||||
1207 | NewI = New->specific_attr_begin<EnableIfAttr>(), | ||||
1208 | NewE = New->specific_attr_end<EnableIfAttr>(), | ||||
1209 | OldI = Old->specific_attr_begin<EnableIfAttr>(), | ||||
1210 | OldE = Old->specific_attr_end<EnableIfAttr>(); | ||||
1211 | NewI != NewE || OldI != OldE; ++NewI, ++OldI) { | ||||
1212 | if (NewI == NewE || OldI == OldE) | ||||
1213 | return true; | ||||
1214 | llvm::FoldingSetNodeID NewID, OldID; | ||||
1215 | NewI->getCond()->Profile(NewID, Context, true); | ||||
1216 | OldI->getCond()->Profile(OldID, Context, true); | ||||
1217 | if (NewID != OldID) | ||||
1218 | return true; | ||||
1219 | } | ||||
1220 | |||||
1221 | if (getLangOpts().CUDA && ConsiderCudaAttrs) { | ||||
1222 | // Don't allow overloading of destructors. (In theory we could, but it | ||||
1223 | // would be a giant change to clang.) | ||||
1224 | if (isa<CXXDestructorDecl>(New)) | ||||
1225 | return false; | ||||
1226 | |||||
1227 | CUDAFunctionTarget NewTarget = IdentifyCUDATarget(New), | ||||
1228 | OldTarget = IdentifyCUDATarget(Old); | ||||
1229 | if (NewTarget == CFT_InvalidTarget) | ||||
1230 | return false; | ||||
1231 | |||||
1232 | assert((OldTarget != CFT_InvalidTarget) && "Unexpected invalid target.")(((OldTarget != CFT_InvalidTarget) && "Unexpected invalid target." ) ? static_cast<void> (0) : __assert_fail ("(OldTarget != CFT_InvalidTarget) && \"Unexpected invalid target.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1232, __PRETTY_FUNCTION__)); | ||||
1233 | |||||
1234 | // Allow overloading of functions with same signature and different CUDA | ||||
1235 | // target attributes. | ||||
1236 | return NewTarget != OldTarget; | ||||
1237 | } | ||||
1238 | |||||
1239 | // The signatures match; this is not an overload. | ||||
1240 | return false; | ||||
1241 | } | ||||
1242 | |||||
1243 | /// Tries a user-defined conversion from From to ToType. | ||||
1244 | /// | ||||
1245 | /// Produces an implicit conversion sequence for when a standard conversion | ||||
1246 | /// is not an option. See TryImplicitConversion for more information. | ||||
1247 | static ImplicitConversionSequence | ||||
1248 | TryUserDefinedConversion(Sema &S, Expr *From, QualType ToType, | ||||
1249 | bool SuppressUserConversions, | ||||
1250 | bool AllowExplicit, | ||||
1251 | bool InOverloadResolution, | ||||
1252 | bool CStyle, | ||||
1253 | bool AllowObjCWritebackConversion, | ||||
1254 | bool AllowObjCConversionOnExplicit) { | ||||
1255 | ImplicitConversionSequence ICS; | ||||
1256 | |||||
1257 | if (SuppressUserConversions) { | ||||
1258 | // We're not in the case above, so there is no conversion that | ||||
1259 | // we can perform. | ||||
1260 | ICS.setBad(BadConversionSequence::no_conversion, From, ToType); | ||||
1261 | return ICS; | ||||
1262 | } | ||||
1263 | |||||
1264 | // Attempt user-defined conversion. | ||||
1265 | OverloadCandidateSet Conversions(From->getExprLoc(), | ||||
1266 | OverloadCandidateSet::CSK_Normal); | ||||
1267 | switch (IsUserDefinedConversion(S, From, ToType, ICS.UserDefined, | ||||
1268 | Conversions, AllowExplicit, | ||||
1269 | AllowObjCConversionOnExplicit)) { | ||||
1270 | case OR_Success: | ||||
1271 | case OR_Deleted: | ||||
1272 | ICS.setUserDefined(); | ||||
1273 | // C++ [over.ics.user]p4: | ||||
1274 | // A conversion of an expression of class type to the same class | ||||
1275 | // type is given Exact Match rank, and a conversion of an | ||||
1276 | // expression of class type to a base class of that type is | ||||
1277 | // given Conversion rank, in spite of the fact that a copy | ||||
1278 | // constructor (i.e., a user-defined conversion function) is | ||||
1279 | // called for those cases. | ||||
1280 | if (CXXConstructorDecl *Constructor | ||||
1281 | = dyn_cast<CXXConstructorDecl>(ICS.UserDefined.ConversionFunction)) { | ||||
1282 | QualType FromCanon | ||||
1283 | = S.Context.getCanonicalType(From->getType().getUnqualifiedType()); | ||||
1284 | QualType ToCanon | ||||
1285 | = S.Context.getCanonicalType(ToType).getUnqualifiedType(); | ||||
1286 | if (Constructor->isCopyConstructor() && | ||||
1287 | (FromCanon == ToCanon || | ||||
1288 | S.IsDerivedFrom(From->getBeginLoc(), FromCanon, ToCanon))) { | ||||
1289 | // Turn this into a "standard" conversion sequence, so that it | ||||
1290 | // gets ranked with standard conversion sequences. | ||||
1291 | DeclAccessPair Found = ICS.UserDefined.FoundConversionFunction; | ||||
1292 | ICS.setStandard(); | ||||
1293 | ICS.Standard.setAsIdentityConversion(); | ||||
1294 | ICS.Standard.setFromType(From->getType()); | ||||
1295 | ICS.Standard.setAllToTypes(ToType); | ||||
1296 | ICS.Standard.CopyConstructor = Constructor; | ||||
1297 | ICS.Standard.FoundCopyConstructor = Found; | ||||
1298 | if (ToCanon != FromCanon) | ||||
1299 | ICS.Standard.Second = ICK_Derived_To_Base; | ||||
1300 | } | ||||
1301 | } | ||||
1302 | break; | ||||
1303 | |||||
1304 | case OR_Ambiguous: | ||||
1305 | ICS.setAmbiguous(); | ||||
1306 | ICS.Ambiguous.setFromType(From->getType()); | ||||
1307 | ICS.Ambiguous.setToType(ToType); | ||||
1308 | for (OverloadCandidateSet::iterator Cand = Conversions.begin(); | ||||
1309 | Cand != Conversions.end(); ++Cand) | ||||
1310 | if (Cand->Viable) | ||||
1311 | ICS.Ambiguous.addConversion(Cand->FoundDecl, Cand->Function); | ||||
1312 | break; | ||||
1313 | |||||
1314 | // Fall through. | ||||
1315 | case OR_No_Viable_Function: | ||||
1316 | ICS.setBad(BadConversionSequence::no_conversion, From, ToType); | ||||
1317 | break; | ||||
1318 | } | ||||
1319 | |||||
1320 | return ICS; | ||||
1321 | } | ||||
1322 | |||||
1323 | /// TryImplicitConversion - Attempt to perform an implicit conversion | ||||
1324 | /// from the given expression (Expr) to the given type (ToType). This | ||||
1325 | /// function returns an implicit conversion sequence that can be used | ||||
1326 | /// to perform the initialization. Given | ||||
1327 | /// | ||||
1328 | /// void f(float f); | ||||
1329 | /// void g(int i) { f(i); } | ||||
1330 | /// | ||||
1331 | /// this routine would produce an implicit conversion sequence to | ||||
1332 | /// describe the initialization of f from i, which will be a standard | ||||
1333 | /// conversion sequence containing an lvalue-to-rvalue conversion (C++ | ||||
1334 | /// 4.1) followed by a floating-integral conversion (C++ 4.9). | ||||
1335 | // | ||||
1336 | /// Note that this routine only determines how the conversion can be | ||||
1337 | /// performed; it does not actually perform the conversion. As such, | ||||
1338 | /// it will not produce any diagnostics if no conversion is available, | ||||
1339 | /// but will instead return an implicit conversion sequence of kind | ||||
1340 | /// "BadConversion". | ||||
1341 | /// | ||||
1342 | /// If @p SuppressUserConversions, then user-defined conversions are | ||||
1343 | /// not permitted. | ||||
1344 | /// If @p AllowExplicit, then explicit user-defined conversions are | ||||
1345 | /// permitted. | ||||
1346 | /// | ||||
1347 | /// \param AllowObjCWritebackConversion Whether we allow the Objective-C | ||||
1348 | /// writeback conversion, which allows __autoreleasing id* parameters to | ||||
1349 | /// be initialized with __strong id* or __weak id* arguments. | ||||
1350 | static ImplicitConversionSequence | ||||
1351 | TryImplicitConversion(Sema &S, Expr *From, QualType ToType, | ||||
1352 | bool SuppressUserConversions, | ||||
1353 | bool AllowExplicit, | ||||
1354 | bool InOverloadResolution, | ||||
1355 | bool CStyle, | ||||
1356 | bool AllowObjCWritebackConversion, | ||||
1357 | bool AllowObjCConversionOnExplicit) { | ||||
1358 | ImplicitConversionSequence ICS; | ||||
1359 | if (IsStandardConversion(S, From, ToType, InOverloadResolution, | ||||
1360 | ICS.Standard, CStyle, AllowObjCWritebackConversion)){ | ||||
1361 | ICS.setStandard(); | ||||
1362 | return ICS; | ||||
1363 | } | ||||
1364 | |||||
1365 | if (!S.getLangOpts().CPlusPlus) { | ||||
1366 | ICS.setBad(BadConversionSequence::no_conversion, From, ToType); | ||||
1367 | return ICS; | ||||
1368 | } | ||||
1369 | |||||
1370 | // C++ [over.ics.user]p4: | ||||
1371 | // A conversion of an expression of class type to the same class | ||||
1372 | // type is given Exact Match rank, and a conversion of an | ||||
1373 | // expression of class type to a base class of that type is | ||||
1374 | // given Conversion rank, in spite of the fact that a copy/move | ||||
1375 | // constructor (i.e., a user-defined conversion function) is | ||||
1376 | // called for those cases. | ||||
1377 | QualType FromType = From->getType(); | ||||
1378 | if (ToType->getAs<RecordType>() && FromType->getAs<RecordType>() && | ||||
1379 | (S.Context.hasSameUnqualifiedType(FromType, ToType) || | ||||
1380 | S.IsDerivedFrom(From->getBeginLoc(), FromType, ToType))) { | ||||
1381 | ICS.setStandard(); | ||||
1382 | ICS.Standard.setAsIdentityConversion(); | ||||
1383 | ICS.Standard.setFromType(FromType); | ||||
1384 | ICS.Standard.setAllToTypes(ToType); | ||||
1385 | |||||
1386 | // We don't actually check at this point whether there is a valid | ||||
1387 | // copy/move constructor, since overloading just assumes that it | ||||
1388 | // exists. When we actually perform initialization, we'll find the | ||||
1389 | // appropriate constructor to copy the returned object, if needed. | ||||
1390 | ICS.Standard.CopyConstructor = nullptr; | ||||
1391 | |||||
1392 | // Determine whether this is considered a derived-to-base conversion. | ||||
1393 | if (!S.Context.hasSameUnqualifiedType(FromType, ToType)) | ||||
1394 | ICS.Standard.Second = ICK_Derived_To_Base; | ||||
1395 | |||||
1396 | return ICS; | ||||
1397 | } | ||||
1398 | |||||
1399 | return TryUserDefinedConversion(S, From, ToType, SuppressUserConversions, | ||||
1400 | AllowExplicit, InOverloadResolution, CStyle, | ||||
1401 | AllowObjCWritebackConversion, | ||||
1402 | AllowObjCConversionOnExplicit); | ||||
1403 | } | ||||
1404 | |||||
1405 | ImplicitConversionSequence | ||||
1406 | Sema::TryImplicitConversion(Expr *From, QualType ToType, | ||||
1407 | bool SuppressUserConversions, | ||||
1408 | bool AllowExplicit, | ||||
1409 | bool InOverloadResolution, | ||||
1410 | bool CStyle, | ||||
1411 | bool AllowObjCWritebackConversion) { | ||||
1412 | return ::TryImplicitConversion(*this, From, ToType, | ||||
1413 | SuppressUserConversions, AllowExplicit, | ||||
1414 | InOverloadResolution, CStyle, | ||||
1415 | AllowObjCWritebackConversion, | ||||
1416 | /*AllowObjCConversionOnExplicit=*/false); | ||||
1417 | } | ||||
1418 | |||||
1419 | /// PerformImplicitConversion - Perform an implicit conversion of the | ||||
1420 | /// expression From to the type ToType. Returns the | ||||
1421 | /// converted expression. Flavor is the kind of conversion we're | ||||
1422 | /// performing, used in the error message. If @p AllowExplicit, | ||||
1423 | /// explicit user-defined conversions are permitted. | ||||
1424 | ExprResult | ||||
1425 | Sema::PerformImplicitConversion(Expr *From, QualType ToType, | ||||
1426 | AssignmentAction Action, bool AllowExplicit) { | ||||
1427 | ImplicitConversionSequence ICS; | ||||
1428 | return PerformImplicitConversion(From, ToType, Action, AllowExplicit, ICS); | ||||
1429 | } | ||||
1430 | |||||
1431 | ExprResult | ||||
1432 | Sema::PerformImplicitConversion(Expr *From, QualType ToType, | ||||
1433 | AssignmentAction Action, bool AllowExplicit, | ||||
1434 | ImplicitConversionSequence& ICS) { | ||||
1435 | if (checkPlaceholderForOverload(*this, From)) | ||||
1436 | return ExprError(); | ||||
1437 | |||||
1438 | // Objective-C ARC: Determine whether we will allow the writeback conversion. | ||||
1439 | bool AllowObjCWritebackConversion | ||||
1440 | = getLangOpts().ObjCAutoRefCount && | ||||
1441 | (Action == AA_Passing || Action == AA_Sending); | ||||
1442 | if (getLangOpts().ObjC) | ||||
1443 | CheckObjCBridgeRelatedConversions(From->getBeginLoc(), ToType, | ||||
1444 | From->getType(), From); | ||||
1445 | ICS = ::TryImplicitConversion(*this, From, ToType, | ||||
1446 | /*SuppressUserConversions=*/false, | ||||
1447 | AllowExplicit, | ||||
1448 | /*InOverloadResolution=*/false, | ||||
1449 | /*CStyle=*/false, | ||||
1450 | AllowObjCWritebackConversion, | ||||
1451 | /*AllowObjCConversionOnExplicit=*/false); | ||||
1452 | return PerformImplicitConversion(From, ToType, ICS, Action); | ||||
1453 | } | ||||
1454 | |||||
1455 | /// Determine whether the conversion from FromType to ToType is a valid | ||||
1456 | /// conversion that strips "noexcept" or "noreturn" off the nested function | ||||
1457 | /// type. | ||||
1458 | bool Sema::IsFunctionConversion(QualType FromType, QualType ToType, | ||||
1459 | QualType &ResultTy) { | ||||
1460 | if (Context.hasSameUnqualifiedType(FromType, ToType)) | ||||
1461 | return false; | ||||
1462 | |||||
1463 | // Permit the conversion F(t __attribute__((noreturn))) -> F(t) | ||||
1464 | // or F(t noexcept) -> F(t) | ||||
1465 | // where F adds one of the following at most once: | ||||
1466 | // - a pointer | ||||
1467 | // - a member pointer | ||||
1468 | // - a block pointer | ||||
1469 | // Changes here need matching changes in FindCompositePointerType. | ||||
1470 | CanQualType CanTo = Context.getCanonicalType(ToType); | ||||
1471 | CanQualType CanFrom = Context.getCanonicalType(FromType); | ||||
1472 | Type::TypeClass TyClass = CanTo->getTypeClass(); | ||||
1473 | if (TyClass != CanFrom->getTypeClass()) return false; | ||||
1474 | if (TyClass != Type::FunctionProto && TyClass != Type::FunctionNoProto) { | ||||
1475 | if (TyClass == Type::Pointer) { | ||||
1476 | CanTo = CanTo.castAs<PointerType>()->getPointeeType(); | ||||
1477 | CanFrom = CanFrom.castAs<PointerType>()->getPointeeType(); | ||||
1478 | } else if (TyClass == Type::BlockPointer) { | ||||
1479 | CanTo = CanTo.castAs<BlockPointerType>()->getPointeeType(); | ||||
1480 | CanFrom = CanFrom.castAs<BlockPointerType>()->getPointeeType(); | ||||
1481 | } else if (TyClass == Type::MemberPointer) { | ||||
1482 | auto ToMPT = CanTo.castAs<MemberPointerType>(); | ||||
1483 | auto FromMPT = CanFrom.castAs<MemberPointerType>(); | ||||
1484 | // A function pointer conversion cannot change the class of the function. | ||||
1485 | if (ToMPT->getClass() != FromMPT->getClass()) | ||||
1486 | return false; | ||||
1487 | CanTo = ToMPT->getPointeeType(); | ||||
1488 | CanFrom = FromMPT->getPointeeType(); | ||||
1489 | } else { | ||||
1490 | return false; | ||||
1491 | } | ||||
1492 | |||||
1493 | TyClass = CanTo->getTypeClass(); | ||||
1494 | if (TyClass != CanFrom->getTypeClass()) return false; | ||||
1495 | if (TyClass != Type::FunctionProto && TyClass != Type::FunctionNoProto) | ||||
1496 | return false; | ||||
1497 | } | ||||
1498 | |||||
1499 | const auto *FromFn = cast<FunctionType>(CanFrom); | ||||
1500 | FunctionType::ExtInfo FromEInfo = FromFn->getExtInfo(); | ||||
1501 | |||||
1502 | const auto *ToFn = cast<FunctionType>(CanTo); | ||||
1503 | FunctionType::ExtInfo ToEInfo = ToFn->getExtInfo(); | ||||
1504 | |||||
1505 | bool Changed = false; | ||||
1506 | |||||
1507 | // Drop 'noreturn' if not present in target type. | ||||
1508 | if (FromEInfo.getNoReturn() && !ToEInfo.getNoReturn()) { | ||||
1509 | FromFn = Context.adjustFunctionType(FromFn, FromEInfo.withNoReturn(false)); | ||||
1510 | Changed = true; | ||||
1511 | } | ||||
1512 | |||||
1513 | // Drop 'noexcept' if not present in target type. | ||||
1514 | if (const auto *FromFPT = dyn_cast<FunctionProtoType>(FromFn)) { | ||||
1515 | const auto *ToFPT = cast<FunctionProtoType>(ToFn); | ||||
1516 | if (FromFPT->isNothrow() && !ToFPT->isNothrow()) { | ||||
1517 | FromFn = cast<FunctionType>( | ||||
1518 | Context.getFunctionTypeWithExceptionSpec(QualType(FromFPT, 0), | ||||
1519 | EST_None) | ||||
1520 | .getTypePtr()); | ||||
1521 | Changed = true; | ||||
1522 | } | ||||
1523 | |||||
1524 | // Convert FromFPT's ExtParameterInfo if necessary. The conversion is valid | ||||
1525 | // only if the ExtParameterInfo lists of the two function prototypes can be | ||||
1526 | // merged and the merged list is identical to ToFPT's ExtParameterInfo list. | ||||
1527 | SmallVector<FunctionProtoType::ExtParameterInfo, 4> NewParamInfos; | ||||
1528 | bool CanUseToFPT, CanUseFromFPT; | ||||
1529 | if (Context.mergeExtParameterInfo(ToFPT, FromFPT, CanUseToFPT, | ||||
1530 | CanUseFromFPT, NewParamInfos) && | ||||
1531 | CanUseToFPT && !CanUseFromFPT) { | ||||
1532 | FunctionProtoType::ExtProtoInfo ExtInfo = FromFPT->getExtProtoInfo(); | ||||
1533 | ExtInfo.ExtParameterInfos = | ||||
1534 | NewParamInfos.empty() ? nullptr : NewParamInfos.data(); | ||||
1535 | QualType QT = Context.getFunctionType(FromFPT->getReturnType(), | ||||
1536 | FromFPT->getParamTypes(), ExtInfo); | ||||
1537 | FromFn = QT->getAs<FunctionType>(); | ||||
1538 | Changed = true; | ||||
1539 | } | ||||
1540 | } | ||||
1541 | |||||
1542 | if (!Changed) | ||||
1543 | return false; | ||||
1544 | |||||
1545 | assert(QualType(FromFn, 0).isCanonical())((QualType(FromFn, 0).isCanonical()) ? static_cast<void> (0) : __assert_fail ("QualType(FromFn, 0).isCanonical()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1545, __PRETTY_FUNCTION__)); | ||||
1546 | if (QualType(FromFn, 0) != CanTo) return false; | ||||
1547 | |||||
1548 | ResultTy = ToType; | ||||
1549 | return true; | ||||
1550 | } | ||||
1551 | |||||
1552 | /// Determine whether the conversion from FromType to ToType is a valid | ||||
1553 | /// vector conversion. | ||||
1554 | /// | ||||
1555 | /// \param ICK Will be set to the vector conversion kind, if this is a vector | ||||
1556 | /// conversion. | ||||
1557 | static bool IsVectorConversion(Sema &S, QualType FromType, | ||||
1558 | QualType ToType, ImplicitConversionKind &ICK) { | ||||
1559 | // We need at least one of these types to be a vector type to have a vector | ||||
1560 | // conversion. | ||||
1561 | if (!ToType->isVectorType() && !FromType->isVectorType()) | ||||
1562 | return false; | ||||
1563 | |||||
1564 | // Identical types require no conversions. | ||||
1565 | if (S.Context.hasSameUnqualifiedType(FromType, ToType)) | ||||
1566 | return false; | ||||
1567 | |||||
1568 | // There are no conversions between extended vector types, only identity. | ||||
1569 | if (ToType->isExtVectorType()) { | ||||
1570 | // There are no conversions between extended vector types other than the | ||||
1571 | // identity conversion. | ||||
1572 | if (FromType->isExtVectorType()) | ||||
1573 | return false; | ||||
1574 | |||||
1575 | // Vector splat from any arithmetic type to a vector. | ||||
1576 | if (FromType->isArithmeticType()) { | ||||
1577 | ICK = ICK_Vector_Splat; | ||||
1578 | return true; | ||||
1579 | } | ||||
1580 | } | ||||
1581 | |||||
1582 | // We can perform the conversion between vector types in the following cases: | ||||
1583 | // 1)vector types are equivalent AltiVec and GCC vector types | ||||
1584 | // 2)lax vector conversions are permitted and the vector types are of the | ||||
1585 | // same size | ||||
1586 | if (ToType->isVectorType() && FromType->isVectorType()) { | ||||
1587 | if (S.Context.areCompatibleVectorTypes(FromType, ToType) || | ||||
1588 | S.isLaxVectorConversion(FromType, ToType)) { | ||||
1589 | ICK = ICK_Vector_Conversion; | ||||
1590 | return true; | ||||
1591 | } | ||||
1592 | } | ||||
1593 | |||||
1594 | return false; | ||||
1595 | } | ||||
1596 | |||||
1597 | static bool tryAtomicConversion(Sema &S, Expr *From, QualType ToType, | ||||
1598 | bool InOverloadResolution, | ||||
1599 | StandardConversionSequence &SCS, | ||||
1600 | bool CStyle); | ||||
1601 | |||||
1602 | /// IsStandardConversion - Determines whether there is a standard | ||||
1603 | /// conversion sequence (C++ [conv], C++ [over.ics.scs]) from the | ||||
1604 | /// expression From to the type ToType. Standard conversion sequences | ||||
1605 | /// only consider non-class types; for conversions that involve class | ||||
1606 | /// types, use TryImplicitConversion. If a conversion exists, SCS will | ||||
1607 | /// contain the standard conversion sequence required to perform this | ||||
1608 | /// conversion and this routine will return true. Otherwise, this | ||||
1609 | /// routine will return false and the value of SCS is unspecified. | ||||
1610 | static bool IsStandardConversion(Sema &S, Expr* From, QualType ToType, | ||||
1611 | bool InOverloadResolution, | ||||
1612 | StandardConversionSequence &SCS, | ||||
1613 | bool CStyle, | ||||
1614 | bool AllowObjCWritebackConversion) { | ||||
1615 | QualType FromType = From->getType(); | ||||
1616 | |||||
1617 | // Standard conversions (C++ [conv]) | ||||
1618 | SCS.setAsIdentityConversion(); | ||||
1619 | SCS.IncompatibleObjC = false; | ||||
1620 | SCS.setFromType(FromType); | ||||
1621 | SCS.CopyConstructor = nullptr; | ||||
1622 | |||||
1623 | // There are no standard conversions for class types in C++, so | ||||
1624 | // abort early. When overloading in C, however, we do permit them. | ||||
1625 | if (S.getLangOpts().CPlusPlus && | ||||
1626 | (FromType->isRecordType() || ToType->isRecordType())) | ||||
1627 | return false; | ||||
1628 | |||||
1629 | // The first conversion can be an lvalue-to-rvalue conversion, | ||||
1630 | // array-to-pointer conversion, or function-to-pointer conversion | ||||
1631 | // (C++ 4p1). | ||||
1632 | |||||
1633 | if (FromType == S.Context.OverloadTy) { | ||||
1634 | DeclAccessPair AccessPair; | ||||
1635 | if (FunctionDecl *Fn | ||||
1636 | = S.ResolveAddressOfOverloadedFunction(From, ToType, false, | ||||
1637 | AccessPair)) { | ||||
1638 | // We were able to resolve the address of the overloaded function, | ||||
1639 | // so we can convert to the type of that function. | ||||
1640 | FromType = Fn->getType(); | ||||
1641 | SCS.setFromType(FromType); | ||||
1642 | |||||
1643 | // we can sometimes resolve &foo<int> regardless of ToType, so check | ||||
1644 | // if the type matches (identity) or we are converting to bool | ||||
1645 | if (!S.Context.hasSameUnqualifiedType( | ||||
1646 | S.ExtractUnqualifiedFunctionType(ToType), FromType)) { | ||||
1647 | QualType resultTy; | ||||
1648 | // if the function type matches except for [[noreturn]], it's ok | ||||
1649 | if (!S.IsFunctionConversion(FromType, | ||||
1650 | S.ExtractUnqualifiedFunctionType(ToType), resultTy)) | ||||
1651 | // otherwise, only a boolean conversion is standard | ||||
1652 | if (!ToType->isBooleanType()) | ||||
1653 | return false; | ||||
1654 | } | ||||
1655 | |||||
1656 | // Check if the "from" expression is taking the address of an overloaded | ||||
1657 | // function and recompute the FromType accordingly. Take advantage of the | ||||
1658 | // fact that non-static member functions *must* have such an address-of | ||||
1659 | // expression. | ||||
1660 | CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn); | ||||
1661 | if (Method && !Method->isStatic()) { | ||||
1662 | assert(isa<UnaryOperator>(From->IgnoreParens()) &&((isa<UnaryOperator>(From->IgnoreParens()) && "Non-unary operator on non-static member address") ? static_cast <void> (0) : __assert_fail ("isa<UnaryOperator>(From->IgnoreParens()) && \"Non-unary operator on non-static member address\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1663, __PRETTY_FUNCTION__)) | ||||
1663 | "Non-unary operator on non-static member address")((isa<UnaryOperator>(From->IgnoreParens()) && "Non-unary operator on non-static member address") ? static_cast <void> (0) : __assert_fail ("isa<UnaryOperator>(From->IgnoreParens()) && \"Non-unary operator on non-static member address\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1663, __PRETTY_FUNCTION__)); | ||||
1664 | assert(cast<UnaryOperator>(From->IgnoreParens())->getOpcode()((cast<UnaryOperator>(From->IgnoreParens())->getOpcode () == UO_AddrOf && "Non-address-of operator on non-static member address" ) ? static_cast<void> (0) : __assert_fail ("cast<UnaryOperator>(From->IgnoreParens())->getOpcode() == UO_AddrOf && \"Non-address-of operator on non-static member address\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1666, __PRETTY_FUNCTION__)) | ||||
1665 | == UO_AddrOf &&((cast<UnaryOperator>(From->IgnoreParens())->getOpcode () == UO_AddrOf && "Non-address-of operator on non-static member address" ) ? static_cast<void> (0) : __assert_fail ("cast<UnaryOperator>(From->IgnoreParens())->getOpcode() == UO_AddrOf && \"Non-address-of operator on non-static member address\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1666, __PRETTY_FUNCTION__)) | ||||
1666 | "Non-address-of operator on non-static member address")((cast<UnaryOperator>(From->IgnoreParens())->getOpcode () == UO_AddrOf && "Non-address-of operator on non-static member address" ) ? static_cast<void> (0) : __assert_fail ("cast<UnaryOperator>(From->IgnoreParens())->getOpcode() == UO_AddrOf && \"Non-address-of operator on non-static member address\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1666, __PRETTY_FUNCTION__)); | ||||
1667 | const Type *ClassType | ||||
1668 | = S.Context.getTypeDeclType(Method->getParent()).getTypePtr(); | ||||
1669 | FromType = S.Context.getMemberPointerType(FromType, ClassType); | ||||
1670 | } else if (isa<UnaryOperator>(From->IgnoreParens())) { | ||||
1671 | assert(cast<UnaryOperator>(From->IgnoreParens())->getOpcode() ==((cast<UnaryOperator>(From->IgnoreParens())->getOpcode () == UO_AddrOf && "Non-address-of operator for overloaded function expression" ) ? static_cast<void> (0) : __assert_fail ("cast<UnaryOperator>(From->IgnoreParens())->getOpcode() == UO_AddrOf && \"Non-address-of operator for overloaded function expression\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1673, __PRETTY_FUNCTION__)) | ||||
1672 | UO_AddrOf &&((cast<UnaryOperator>(From->IgnoreParens())->getOpcode () == UO_AddrOf && "Non-address-of operator for overloaded function expression" ) ? static_cast<void> (0) : __assert_fail ("cast<UnaryOperator>(From->IgnoreParens())->getOpcode() == UO_AddrOf && \"Non-address-of operator for overloaded function expression\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1673, __PRETTY_FUNCTION__)) | ||||
1673 | "Non-address-of operator for overloaded function expression")((cast<UnaryOperator>(From->IgnoreParens())->getOpcode () == UO_AddrOf && "Non-address-of operator for overloaded function expression" ) ? static_cast<void> (0) : __assert_fail ("cast<UnaryOperator>(From->IgnoreParens())->getOpcode() == UO_AddrOf && \"Non-address-of operator for overloaded function expression\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1673, __PRETTY_FUNCTION__)); | ||||
1674 | FromType = S.Context.getPointerType(FromType); | ||||
1675 | } | ||||
1676 | |||||
1677 | // Check that we've computed the proper type after overload resolution. | ||||
1678 | // FIXME: FixOverloadedFunctionReference has side-effects; we shouldn't | ||||
1679 | // be calling it from within an NDEBUG block. | ||||
1680 | assert(S.Context.hasSameType(((S.Context.hasSameType( FromType, S.FixOverloadedFunctionReference (From, AccessPair, Fn)->getType())) ? static_cast<void> (0) : __assert_fail ("S.Context.hasSameType( FromType, S.FixOverloadedFunctionReference(From, AccessPair, Fn)->getType())" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1682, __PRETTY_FUNCTION__)) | ||||
1681 | FromType,((S.Context.hasSameType( FromType, S.FixOverloadedFunctionReference (From, AccessPair, Fn)->getType())) ? static_cast<void> (0) : __assert_fail ("S.Context.hasSameType( FromType, S.FixOverloadedFunctionReference(From, AccessPair, Fn)->getType())" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1682, __PRETTY_FUNCTION__)) | ||||
1682 | S.FixOverloadedFunctionReference(From, AccessPair, Fn)->getType()))((S.Context.hasSameType( FromType, S.FixOverloadedFunctionReference (From, AccessPair, Fn)->getType())) ? static_cast<void> (0) : __assert_fail ("S.Context.hasSameType( FromType, S.FixOverloadedFunctionReference(From, AccessPair, Fn)->getType())" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 1682, __PRETTY_FUNCTION__)); | ||||
1683 | } else { | ||||
1684 | return false; | ||||
1685 | } | ||||
1686 | } | ||||
1687 | // Lvalue-to-rvalue conversion (C++11 4.1): | ||||
1688 | // A glvalue (3.10) of a non-function, non-array type T can | ||||
1689 | // be converted to a prvalue. | ||||
1690 | bool argIsLValue = From->isGLValue(); | ||||
1691 | if (argIsLValue && | ||||
1692 | !FromType->isFunctionType() && !FromType->isArrayType() && | ||||
1693 | S.Context.getCanonicalType(FromType) != S.Context.OverloadTy) { | ||||
1694 | SCS.First = ICK_Lvalue_To_Rvalue; | ||||
1695 | |||||
1696 | // C11 6.3.2.1p2: | ||||
1697 | // ... if the lvalue has atomic type, the value has the non-atomic version | ||||
1698 | // of the type of the lvalue ... | ||||
1699 | if (const AtomicType *Atomic = FromType->getAs<AtomicType>()) | ||||
1700 | FromType = Atomic->getValueType(); | ||||
1701 | |||||
1702 | // If T is a non-class type, the type of the rvalue is the | ||||
1703 | // cv-unqualified version of T. Otherwise, the type of the rvalue | ||||
1704 | // is T (C++ 4.1p1). C++ can't get here with class types; in C, we | ||||
1705 | // just strip the qualifiers because they don't matter. | ||||
1706 | FromType = FromType.getUnqualifiedType(); | ||||
1707 | } else if (FromType->isArrayType()) { | ||||
1708 | // Array-to-pointer conversion (C++ 4.2) | ||||
1709 | SCS.First = ICK_Array_To_Pointer; | ||||
1710 | |||||
1711 | // An lvalue or rvalue of type "array of N T" or "array of unknown | ||||
1712 | // bound of T" can be converted to an rvalue of type "pointer to | ||||
1713 | // T" (C++ 4.2p1). | ||||
1714 | FromType = S.Context.getArrayDecayedType(FromType); | ||||
1715 | |||||
1716 | if (S.IsStringLiteralToNonConstPointerConversion(From, ToType)) { | ||||
1717 | // This conversion is deprecated in C++03 (D.4) | ||||
1718 | SCS.DeprecatedStringLiteralToCharPtr = true; | ||||
1719 | |||||
1720 | // For the purpose of ranking in overload resolution | ||||
1721 | // (13.3.3.1.1), this conversion is considered an | ||||
1722 | // array-to-pointer conversion followed by a qualification | ||||
1723 | // conversion (4.4). (C++ 4.2p2) | ||||
1724 | SCS.Second = ICK_Identity; | ||||
1725 | SCS.Third = ICK_Qualification; | ||||
1726 | SCS.QualificationIncludesObjCLifetime = false; | ||||
1727 | SCS.setAllToTypes(FromType); | ||||
1728 | return true; | ||||
1729 | } | ||||
1730 | } else if (FromType->isFunctionType() && argIsLValue) { | ||||
1731 | // Function-to-pointer conversion (C++ 4.3). | ||||
1732 | SCS.First = ICK_Function_To_Pointer; | ||||
1733 | |||||
1734 | if (auto *DRE = dyn_cast<DeclRefExpr>(From->IgnoreParenCasts())) | ||||
1735 | if (auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) | ||||
1736 | if (!S.checkAddressOfFunctionIsAvailable(FD)) | ||||
1737 | return false; | ||||
1738 | |||||
1739 | // An lvalue of function type T can be converted to an rvalue of | ||||
1740 | // type "pointer to T." The result is a pointer to the | ||||
1741 | // function. (C++ 4.3p1). | ||||
1742 | FromType = S.Context.getPointerType(FromType); | ||||
1743 | } else { | ||||
1744 | // We don't require any conversions for the first step. | ||||
1745 | SCS.First = ICK_Identity; | ||||
1746 | } | ||||
1747 | SCS.setToType(0, FromType); | ||||
1748 | |||||
1749 | // The second conversion can be an integral promotion, floating | ||||
1750 | // point promotion, integral conversion, floating point conversion, | ||||
1751 | // floating-integral conversion, pointer conversion, | ||||
1752 | // pointer-to-member conversion, or boolean conversion (C++ 4p1). | ||||
1753 | // For overloading in C, this can also be a "compatible-type" | ||||
1754 | // conversion. | ||||
1755 | bool IncompatibleObjC = false; | ||||
1756 | ImplicitConversionKind SecondICK = ICK_Identity; | ||||
1757 | if (S.Context.hasSameUnqualifiedType(FromType, ToType)) { | ||||
1758 | // The unqualified versions of the types are the same: there's no | ||||
1759 | // conversion to do. | ||||
1760 | SCS.Second = ICK_Identity; | ||||
1761 | } else if (S.IsIntegralPromotion(From, FromType, ToType)) { | ||||
1762 | // Integral promotion (C++ 4.5). | ||||
1763 | SCS.Second = ICK_Integral_Promotion; | ||||
1764 | FromType = ToType.getUnqualifiedType(); | ||||
1765 | } else if (S.IsFloatingPointPromotion(FromType, ToType)) { | ||||
1766 | // Floating point promotion (C++ 4.6). | ||||
1767 | SCS.Second = ICK_Floating_Promotion; | ||||
1768 | FromType = ToType.getUnqualifiedType(); | ||||
1769 | } else if (S.IsComplexPromotion(FromType, ToType)) { | ||||
1770 | // Complex promotion (Clang extension) | ||||
1771 | SCS.Second = ICK_Complex_Promotion; | ||||
1772 | FromType = ToType.getUnqualifiedType(); | ||||
1773 | } else if (ToType->isBooleanType() && | ||||
1774 | (FromType->isArithmeticType() || | ||||
1775 | FromType->isAnyPointerType() || | ||||
1776 | FromType->isBlockPointerType() || | ||||
1777 | FromType->isMemberPointerType() || | ||||
1778 | FromType->isNullPtrType())) { | ||||
1779 | // Boolean conversions (C++ 4.12). | ||||
1780 | SCS.Second = ICK_Boolean_Conversion; | ||||
1781 | FromType = S.Context.BoolTy; | ||||
1782 | } else if (FromType->isIntegralOrUnscopedEnumerationType() && | ||||
1783 | ToType->isIntegralType(S.Context)) { | ||||
1784 | // Integral conversions (C++ 4.7). | ||||
1785 | SCS.Second = ICK_Integral_Conversion; | ||||
1786 | FromType = ToType.getUnqualifiedType(); | ||||
1787 | } else if (FromType->isAnyComplexType() && ToType->isAnyComplexType()) { | ||||
1788 | // Complex conversions (C99 6.3.1.6) | ||||
1789 | SCS.Second = ICK_Complex_Conversion; | ||||
1790 | FromType = ToType.getUnqualifiedType(); | ||||
1791 | } else if ((FromType->isAnyComplexType() && ToType->isArithmeticType()) || | ||||
1792 | (ToType->isAnyComplexType() && FromType->isArithmeticType())) { | ||||
1793 | // Complex-real conversions (C99 6.3.1.7) | ||||
1794 | SCS.Second = ICK_Complex_Real; | ||||
1795 | FromType = ToType.getUnqualifiedType(); | ||||
1796 | } else if (FromType->isRealFloatingType() && ToType->isRealFloatingType()) { | ||||
1797 | // FIXME: disable conversions between long double and __float128 if | ||||
1798 | // their representation is different until there is back end support | ||||
1799 | // We of course allow this conversion if long double is really double. | ||||
1800 | if (&S.Context.getFloatTypeSemantics(FromType) != | ||||
1801 | &S.Context.getFloatTypeSemantics(ToType)) { | ||||
1802 | bool Float128AndLongDouble = ((FromType == S.Context.Float128Ty && | ||||
1803 | ToType == S.Context.LongDoubleTy) || | ||||
1804 | (FromType == S.Context.LongDoubleTy && | ||||
1805 | ToType == S.Context.Float128Ty)); | ||||
1806 | if (Float128AndLongDouble && | ||||
1807 | (&S.Context.getFloatTypeSemantics(S.Context.LongDoubleTy) == | ||||
1808 | &llvm::APFloat::PPCDoubleDouble())) | ||||
1809 | return false; | ||||
1810 | } | ||||
1811 | // Floating point conversions (C++ 4.8). | ||||
1812 | SCS.Second = ICK_Floating_Conversion; | ||||
1813 | FromType = ToType.getUnqualifiedType(); | ||||
1814 | } else if ((FromType->isRealFloatingType() && | ||||
1815 | ToType->isIntegralType(S.Context)) || | ||||
1816 | (FromType->isIntegralOrUnscopedEnumerationType() && | ||||
1817 | ToType->isRealFloatingType())) { | ||||
1818 | // Floating-integral conversions (C++ 4.9). | ||||
1819 | SCS.Second = ICK_Floating_Integral; | ||||
1820 | FromType = ToType.getUnqualifiedType(); | ||||
1821 | } else if (S.IsBlockPointerConversion(FromType, ToType, FromType)) { | ||||
1822 | SCS.Second = ICK_Block_Pointer_Conversion; | ||||
1823 | } else if (AllowObjCWritebackConversion && | ||||
1824 | S.isObjCWritebackConversion(FromType, ToType, FromType)) { | ||||
1825 | SCS.Second = ICK_Writeback_Conversion; | ||||
1826 | } else if (S.IsPointerConversion(From, FromType, ToType, InOverloadResolution, | ||||
1827 | FromType, IncompatibleObjC)) { | ||||
1828 | // Pointer conversions (C++ 4.10). | ||||
1829 | SCS.Second = ICK_Pointer_Conversion; | ||||
1830 | SCS.IncompatibleObjC = IncompatibleObjC; | ||||
1831 | FromType = FromType.getUnqualifiedType(); | ||||
1832 | } else if (S.IsMemberPointerConversion(From, FromType, ToType, | ||||
1833 | InOverloadResolution, FromType)) { | ||||
1834 | // Pointer to member conversions (4.11). | ||||
1835 | SCS.Second = ICK_Pointer_Member; | ||||
1836 | } else if (IsVectorConversion(S, FromType, ToType, SecondICK)) { | ||||
1837 | SCS.Second = SecondICK; | ||||
1838 | FromType = ToType.getUnqualifiedType(); | ||||
1839 | } else if (!S.getLangOpts().CPlusPlus && | ||||
1840 | S.Context.typesAreCompatible(ToType, FromType)) { | ||||
1841 | // Compatible conversions (Clang extension for C function overloading) | ||||
1842 | SCS.Second = ICK_Compatible_Conversion; | ||||
1843 | FromType = ToType.getUnqualifiedType(); | ||||
1844 | } else if (IsTransparentUnionStandardConversion(S, From, ToType, | ||||
1845 | InOverloadResolution, | ||||
1846 | SCS, CStyle)) { | ||||
1847 | SCS.Second = ICK_TransparentUnionConversion; | ||||
1848 | FromType = ToType; | ||||
1849 | } else if (tryAtomicConversion(S, From, ToType, InOverloadResolution, SCS, | ||||
1850 | CStyle)) { | ||||
1851 | // tryAtomicConversion has updated the standard conversion sequence | ||||
1852 | // appropriately. | ||||
1853 | return true; | ||||
1854 | } else if (ToType->isEventT() && | ||||
1855 | From->isIntegerConstantExpr(S.getASTContext()) && | ||||
1856 | From->EvaluateKnownConstInt(S.getASTContext()) == 0) { | ||||
1857 | SCS.Second = ICK_Zero_Event_Conversion; | ||||
1858 | FromType = ToType; | ||||
1859 | } else if (ToType->isQueueT() && | ||||
1860 | From->isIntegerConstantExpr(S.getASTContext()) && | ||||
1861 | (From->EvaluateKnownConstInt(S.getASTContext()) == 0)) { | ||||
1862 | SCS.Second = ICK_Zero_Queue_Conversion; | ||||
1863 | FromType = ToType; | ||||
1864 | } else if (ToType->isSamplerT() && | ||||
1865 | From->isIntegerConstantExpr(S.getASTContext())) { | ||||
1866 | SCS.Second = ICK_Compatible_Conversion; | ||||
1867 | FromType = ToType; | ||||
1868 | } else { | ||||
1869 | // No second conversion required. | ||||
1870 | SCS.Second = ICK_Identity; | ||||
1871 | } | ||||
1872 | SCS.setToType(1, FromType); | ||||
1873 | |||||
1874 | // The third conversion can be a function pointer conversion or a | ||||
1875 | // qualification conversion (C++ [conv.fctptr], [conv.qual]). | ||||
1876 | bool ObjCLifetimeConversion; | ||||
1877 | if (S.IsFunctionConversion(FromType, ToType, FromType)) { | ||||
1878 | // Function pointer conversions (removing 'noexcept') including removal of | ||||
1879 | // 'noreturn' (Clang extension). | ||||
1880 | SCS.Third = ICK_Function_Conversion; | ||||
1881 | } else if (S.IsQualificationConversion(FromType, ToType, CStyle, | ||||
1882 | ObjCLifetimeConversion)) { | ||||
1883 | SCS.Third = ICK_Qualification; | ||||
1884 | SCS.QualificationIncludesObjCLifetime = ObjCLifetimeConversion; | ||||
1885 | FromType = ToType; | ||||
1886 | } else { | ||||
1887 | // No conversion required | ||||
1888 | SCS.Third = ICK_Identity; | ||||
1889 | } | ||||
1890 | |||||
1891 | // C++ [over.best.ics]p6: | ||||
1892 | // [...] Any difference in top-level cv-qualification is | ||||
1893 | // subsumed by the initialization itself and does not constitute | ||||
1894 | // a conversion. [...] | ||||
1895 | QualType CanonFrom = S.Context.getCanonicalType(FromType); | ||||
1896 | QualType CanonTo = S.Context.getCanonicalType(ToType); | ||||
1897 | if (CanonFrom.getLocalUnqualifiedType() | ||||
1898 | == CanonTo.getLocalUnqualifiedType() && | ||||
1899 | CanonFrom.getLocalQualifiers() != CanonTo.getLocalQualifiers()) { | ||||
1900 | FromType = ToType; | ||||
1901 | CanonFrom = CanonTo; | ||||
1902 | } | ||||
1903 | |||||
1904 | SCS.setToType(2, FromType); | ||||
1905 | |||||
1906 | if (CanonFrom == CanonTo) | ||||
1907 | return true; | ||||
1908 | |||||
1909 | // If we have not converted the argument type to the parameter type, | ||||
1910 | // this is a bad conversion sequence, unless we're resolving an overload in C. | ||||
1911 | if (S.getLangOpts().CPlusPlus || !InOverloadResolution) | ||||
1912 | return false; | ||||
1913 | |||||
1914 | ExprResult ER = ExprResult{From}; | ||||
1915 | Sema::AssignConvertType Conv = | ||||
1916 | S.CheckSingleAssignmentConstraints(ToType, ER, | ||||
1917 | /*Diagnose=*/false, | ||||
1918 | /*DiagnoseCFAudited=*/false, | ||||
1919 | /*ConvertRHS=*/false); | ||||
1920 | ImplicitConversionKind SecondConv; | ||||
1921 | switch (Conv) { | ||||
1922 | case Sema::Compatible: | ||||
1923 | SecondConv = ICK_C_Only_Conversion; | ||||
1924 | break; | ||||
1925 | // For our purposes, discarding qualifiers is just as bad as using an | ||||
1926 | // incompatible pointer. Note that an IncompatiblePointer conversion can drop | ||||
1927 | // qualifiers, as well. | ||||
1928 | case Sema::CompatiblePointerDiscardsQualifiers: | ||||
1929 | case Sema::IncompatiblePointer: | ||||
1930 | case Sema::IncompatiblePointerSign: | ||||
1931 | SecondConv = ICK_Incompatible_Pointer_Conversion; | ||||
1932 | break; | ||||
1933 | default: | ||||
1934 | return false; | ||||
1935 | } | ||||
1936 | |||||
1937 | // First can only be an lvalue conversion, so we pretend that this was the | ||||
1938 | // second conversion. First should already be valid from earlier in the | ||||
1939 | // function. | ||||
1940 | SCS.Second = SecondConv; | ||||
1941 | SCS.setToType(1, ToType); | ||||
1942 | |||||
1943 | // Third is Identity, because Second should rank us worse than any other | ||||
1944 | // conversion. This could also be ICK_Qualification, but it's simpler to just | ||||
1945 | // lump everything in with the second conversion, and we don't gain anything | ||||
1946 | // from making this ICK_Qualification. | ||||
1947 | SCS.Third = ICK_Identity; | ||||
1948 | SCS.setToType(2, ToType); | ||||
1949 | return true; | ||||
1950 | } | ||||
1951 | |||||
1952 | static bool | ||||
1953 | IsTransparentUnionStandardConversion(Sema &S, Expr* From, | ||||
1954 | QualType &ToType, | ||||
1955 | bool InOverloadResolution, | ||||
1956 | StandardConversionSequence &SCS, | ||||
1957 | bool CStyle) { | ||||
1958 | |||||
1959 | const RecordType *UT = ToType->getAsUnionType(); | ||||
1960 | if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>()) | ||||
1961 | return false; | ||||
1962 | // The field to initialize within the transparent union. | ||||
1963 | RecordDecl *UD = UT->getDecl(); | ||||
1964 | // It's compatible if the expression matches any of the fields. | ||||
1965 | for (const auto *it : UD->fields()) { | ||||
1966 | if (IsStandardConversion(S, From, it->getType(), InOverloadResolution, SCS, | ||||
1967 | CStyle, /*AllowObjCWritebackConversion=*/false)) { | ||||
1968 | ToType = it->getType(); | ||||
1969 | return true; | ||||
1970 | } | ||||
1971 | } | ||||
1972 | return false; | ||||
1973 | } | ||||
1974 | |||||
1975 | /// IsIntegralPromotion - Determines whether the conversion from the | ||||
1976 | /// expression From (whose potentially-adjusted type is FromType) to | ||||
1977 | /// ToType is an integral promotion (C++ 4.5). If so, returns true and | ||||
1978 | /// sets PromotedType to the promoted type. | ||||
1979 | bool Sema::IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType) { | ||||
1980 | const BuiltinType *To = ToType->getAs<BuiltinType>(); | ||||
1981 | // All integers are built-in. | ||||
1982 | if (!To) { | ||||
1983 | return false; | ||||
1984 | } | ||||
1985 | |||||
1986 | // An rvalue of type char, signed char, unsigned char, short int, or | ||||
1987 | // unsigned short int can be converted to an rvalue of type int if | ||||
1988 | // int can represent all the values of the source type; otherwise, | ||||
1989 | // the source rvalue can be converted to an rvalue of type unsigned | ||||
1990 | // int (C++ 4.5p1). | ||||
1991 | if (FromType->isPromotableIntegerType() && !FromType->isBooleanType() && | ||||
1992 | !FromType->isEnumeralType()) { | ||||
1993 | if (// We can promote any signed, promotable integer type to an int | ||||
1994 | (FromType->isSignedIntegerType() || | ||||
1995 | // We can promote any unsigned integer type whose size is | ||||
1996 | // less than int to an int. | ||||
1997 | Context.getTypeSize(FromType) < Context.getTypeSize(ToType))) { | ||||
1998 | return To->getKind() == BuiltinType::Int; | ||||
1999 | } | ||||
2000 | |||||
2001 | return To->getKind() == BuiltinType::UInt; | ||||
2002 | } | ||||
2003 | |||||
2004 | // C++11 [conv.prom]p3: | ||||
2005 | // A prvalue of an unscoped enumeration type whose underlying type is not | ||||
2006 | // fixed (7.2) can be converted to an rvalue a prvalue of the first of the | ||||
2007 | // following types that can represent all the values of the enumeration | ||||
2008 | // (i.e., the values in the range bmin to bmax as described in 7.2): int, | ||||
2009 | // unsigned int, long int, unsigned long int, long long int, or unsigned | ||||
2010 | // long long int. If none of the types in that list can represent all the | ||||
2011 | // values of the enumeration, an rvalue a prvalue of an unscoped enumeration | ||||
2012 | // type can be converted to an rvalue a prvalue of the extended integer type | ||||
2013 | // with lowest integer conversion rank (4.13) greater than the rank of long | ||||
2014 | // long in which all the values of the enumeration can be represented. If | ||||
2015 | // there are two such extended types, the signed one is chosen. | ||||
2016 | // C++11 [conv.prom]p4: | ||||
2017 | // A prvalue of an unscoped enumeration type whose underlying type is fixed | ||||
2018 | // can be converted to a prvalue of its underlying type. Moreover, if | ||||
2019 | // integral promotion can be applied to its underlying type, a prvalue of an | ||||
2020 | // unscoped enumeration type whose underlying type is fixed can also be | ||||
2021 | // converted to a prvalue of the promoted underlying type. | ||||
2022 | if (const EnumType *FromEnumType = FromType->getAs<EnumType>()) { | ||||
2023 | // C++0x 7.2p9: Note that this implicit enum to int conversion is not | ||||
2024 | // provided for a scoped enumeration. | ||||
2025 | if (FromEnumType->getDecl()->isScoped()) | ||||
2026 | return false; | ||||
2027 | |||||
2028 | // We can perform an integral promotion to the underlying type of the enum, | ||||
2029 | // even if that's not the promoted type. Note that the check for promoting | ||||
2030 | // the underlying type is based on the type alone, and does not consider | ||||
2031 | // the bitfield-ness of the actual source expression. | ||||
2032 | if (FromEnumType->getDecl()->isFixed()) { | ||||
2033 | QualType Underlying = FromEnumType->getDecl()->getIntegerType(); | ||||
2034 | return Context.hasSameUnqualifiedType(Underlying, ToType) || | ||||
2035 | IsIntegralPromotion(nullptr, Underlying, ToType); | ||||
2036 | } | ||||
2037 | |||||
2038 | // We have already pre-calculated the promotion type, so this is trivial. | ||||
2039 | if (ToType->isIntegerType() && | ||||
2040 | isCompleteType(From->getBeginLoc(), FromType)) | ||||
2041 | return Context.hasSameUnqualifiedType( | ||||
2042 | ToType, FromEnumType->getDecl()->getPromotionType()); | ||||
2043 | |||||
2044 | // C++ [conv.prom]p5: | ||||
2045 | // If the bit-field has an enumerated type, it is treated as any other | ||||
2046 | // value of that type for promotion purposes. | ||||
2047 | // | ||||
2048 | // ... so do not fall through into the bit-field checks below in C++. | ||||
2049 | if (getLangOpts().CPlusPlus) | ||||
2050 | return false; | ||||
2051 | } | ||||
2052 | |||||
2053 | // C++0x [conv.prom]p2: | ||||
2054 | // A prvalue of type char16_t, char32_t, or wchar_t (3.9.1) can be converted | ||||
2055 | // to an rvalue a prvalue of the first of the following types that can | ||||
2056 | // represent all the values of its underlying type: int, unsigned int, | ||||
2057 | // long int, unsigned long int, long long int, or unsigned long long int. | ||||
2058 | // If none of the types in that list can represent all the values of its | ||||
2059 | // underlying type, an rvalue a prvalue of type char16_t, char32_t, | ||||
2060 | // or wchar_t can be converted to an rvalue a prvalue of its underlying | ||||
2061 | // type. | ||||
2062 | if (FromType->isAnyCharacterType() && !FromType->isCharType() && | ||||
2063 | ToType->isIntegerType()) { | ||||
2064 | // Determine whether the type we're converting from is signed or | ||||
2065 | // unsigned. | ||||
2066 | bool FromIsSigned = FromType->isSignedIntegerType(); | ||||
2067 | uint64_t FromSize = Context.getTypeSize(FromType); | ||||
2068 | |||||
2069 | // The types we'll try to promote to, in the appropriate | ||||
2070 | // order. Try each of these types. | ||||
2071 | QualType PromoteTypes[6] = { | ||||
2072 | Context.IntTy, Context.UnsignedIntTy, | ||||
2073 | Context.LongTy, Context.UnsignedLongTy , | ||||
2074 | Context.LongLongTy, Context.UnsignedLongLongTy | ||||
2075 | }; | ||||
2076 | for (int Idx = 0; Idx < 6; ++Idx) { | ||||
2077 | uint64_t ToSize = Context.getTypeSize(PromoteTypes[Idx]); | ||||
2078 | if (FromSize < ToSize || | ||||
2079 | (FromSize == ToSize && | ||||
2080 | FromIsSigned == PromoteTypes[Idx]->isSignedIntegerType())) { | ||||
2081 | // We found the type that we can promote to. If this is the | ||||
2082 | // type we wanted, we have a promotion. Otherwise, no | ||||
2083 | // promotion. | ||||
2084 | return Context.hasSameUnqualifiedType(ToType, PromoteTypes[Idx]); | ||||
2085 | } | ||||
2086 | } | ||||
2087 | } | ||||
2088 | |||||
2089 | // An rvalue for an integral bit-field (9.6) can be converted to an | ||||
2090 | // rvalue of type int if int can represent all the values of the | ||||
2091 | // bit-field; otherwise, it can be converted to unsigned int if | ||||
2092 | // unsigned int can represent all the values of the bit-field. If | ||||
2093 | // the bit-field is larger yet, no integral promotion applies to | ||||
2094 | // it. If the bit-field has an enumerated type, it is treated as any | ||||
2095 | // other value of that type for promotion purposes (C++ 4.5p3). | ||||
2096 | // FIXME: We should delay checking of bit-fields until we actually perform the | ||||
2097 | // conversion. | ||||
2098 | // | ||||
2099 | // FIXME: In C, only bit-fields of types _Bool, int, or unsigned int may be | ||||
2100 | // promoted, per C11 6.3.1.1/2. We promote all bit-fields (including enum | ||||
2101 | // bit-fields and those whose underlying type is larger than int) for GCC | ||||
2102 | // compatibility. | ||||
2103 | if (From) { | ||||
2104 | if (FieldDecl *MemberDecl = From->getSourceBitField()) { | ||||
2105 | llvm::APSInt BitWidth; | ||||
2106 | if (FromType->isIntegralType(Context) && | ||||
2107 | MemberDecl->getBitWidth()->isIntegerConstantExpr(BitWidth, Context)) { | ||||
2108 | llvm::APSInt ToSize(BitWidth.getBitWidth(), BitWidth.isUnsigned()); | ||||
2109 | ToSize = Context.getTypeSize(ToType); | ||||
2110 | |||||
2111 | // Are we promoting to an int from a bitfield that fits in an int? | ||||
2112 | if (BitWidth < ToSize || | ||||
2113 | (FromType->isSignedIntegerType() && BitWidth <= ToSize)) { | ||||
2114 | return To->getKind() == BuiltinType::Int; | ||||
2115 | } | ||||
2116 | |||||
2117 | // Are we promoting to an unsigned int from an unsigned bitfield | ||||
2118 | // that fits into an unsigned int? | ||||
2119 | if (FromType->isUnsignedIntegerType() && BitWidth <= ToSize) { | ||||
2120 | return To->getKind() == BuiltinType::UInt; | ||||
2121 | } | ||||
2122 | |||||
2123 | return false; | ||||
2124 | } | ||||
2125 | } | ||||
2126 | } | ||||
2127 | |||||
2128 | // An rvalue of type bool can be converted to an rvalue of type int, | ||||
2129 | // with false becoming zero and true becoming one (C++ 4.5p4). | ||||
2130 | if (FromType->isBooleanType() && To->getKind() == BuiltinType::Int) { | ||||
2131 | return true; | ||||
2132 | } | ||||
2133 | |||||
2134 | return false; | ||||
2135 | } | ||||
2136 | |||||
2137 | /// IsFloatingPointPromotion - Determines whether the conversion from | ||||
2138 | /// FromType to ToType is a floating point promotion (C++ 4.6). If so, | ||||
2139 | /// returns true and sets PromotedType to the promoted type. | ||||
2140 | bool Sema::IsFloatingPointPromotion(QualType FromType, QualType ToType) { | ||||
2141 | if (const BuiltinType *FromBuiltin = FromType->getAs<BuiltinType>()) | ||||
2142 | if (const BuiltinType *ToBuiltin = ToType->getAs<BuiltinType>()) { | ||||
2143 | /// An rvalue of type float can be converted to an rvalue of type | ||||
2144 | /// double. (C++ 4.6p1). | ||||
2145 | if (FromBuiltin->getKind() == BuiltinType::Float && | ||||
2146 | ToBuiltin->getKind() == BuiltinType::Double) | ||||
2147 | return true; | ||||
2148 | |||||
2149 | // C99 6.3.1.5p1: | ||||
2150 | // When a float is promoted to double or long double, or a | ||||
2151 | // double is promoted to long double [...]. | ||||
2152 | if (!getLangOpts().CPlusPlus && | ||||
2153 | (FromBuiltin->getKind() == BuiltinType::Float || | ||||
2154 | FromBuiltin->getKind() == BuiltinType::Double) && | ||||
2155 | (ToBuiltin->getKind() == BuiltinType::LongDouble || | ||||
2156 | ToBuiltin->getKind() == BuiltinType::Float128)) | ||||
2157 | return true; | ||||
2158 | |||||
2159 | // Half can be promoted to float. | ||||
2160 | if (!getLangOpts().NativeHalfType && | ||||
2161 | FromBuiltin->getKind() == BuiltinType::Half && | ||||
2162 | ToBuiltin->getKind() == BuiltinType::Float) | ||||
2163 | return true; | ||||
2164 | } | ||||
2165 | |||||
2166 | return false; | ||||
2167 | } | ||||
2168 | |||||
2169 | /// Determine if a conversion is a complex promotion. | ||||
2170 | /// | ||||
2171 | /// A complex promotion is defined as a complex -> complex conversion | ||||
2172 | /// where the conversion between the underlying real types is a | ||||
2173 | /// floating-point or integral promotion. | ||||
2174 | bool Sema::IsComplexPromotion(QualType FromType, QualType ToType) { | ||||
2175 | const ComplexType *FromComplex = FromType->getAs<ComplexType>(); | ||||
2176 | if (!FromComplex) | ||||
2177 | return false; | ||||
2178 | |||||
2179 | const ComplexType *ToComplex = ToType->getAs<ComplexType>(); | ||||
2180 | if (!ToComplex) | ||||
2181 | return false; | ||||
2182 | |||||
2183 | return IsFloatingPointPromotion(FromComplex->getElementType(), | ||||
2184 | ToComplex->getElementType()) || | ||||
2185 | IsIntegralPromotion(nullptr, FromComplex->getElementType(), | ||||
2186 | ToComplex->getElementType()); | ||||
2187 | } | ||||
2188 | |||||
2189 | /// BuildSimilarlyQualifiedPointerType - In a pointer conversion from | ||||
2190 | /// the pointer type FromPtr to a pointer to type ToPointee, with the | ||||
2191 | /// same type qualifiers as FromPtr has on its pointee type. ToType, | ||||
2192 | /// if non-empty, will be a pointer to ToType that may or may not have | ||||
2193 | /// the right set of qualifiers on its pointee. | ||||
2194 | /// | ||||
2195 | static QualType | ||||
2196 | BuildSimilarlyQualifiedPointerType(const Type *FromPtr, | ||||
2197 | QualType ToPointee, QualType ToType, | ||||
2198 | ASTContext &Context, | ||||
2199 | bool StripObjCLifetime = false) { | ||||
2200 | assert((FromPtr->getTypeClass() == Type::Pointer ||(((FromPtr->getTypeClass() == Type::Pointer || FromPtr-> getTypeClass() == Type::ObjCObjectPointer) && "Invalid similarly-qualified pointer type" ) ? static_cast<void> (0) : __assert_fail ("(FromPtr->getTypeClass() == Type::Pointer || FromPtr->getTypeClass() == Type::ObjCObjectPointer) && \"Invalid similarly-qualified pointer type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 2202, __PRETTY_FUNCTION__)) | ||||
2201 | FromPtr->getTypeClass() == Type::ObjCObjectPointer) &&(((FromPtr->getTypeClass() == Type::Pointer || FromPtr-> getTypeClass() == Type::ObjCObjectPointer) && "Invalid similarly-qualified pointer type" ) ? static_cast<void> (0) : __assert_fail ("(FromPtr->getTypeClass() == Type::Pointer || FromPtr->getTypeClass() == Type::ObjCObjectPointer) && \"Invalid similarly-qualified pointer type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 2202, __PRETTY_FUNCTION__)) | ||||
2202 | "Invalid similarly-qualified pointer type")(((FromPtr->getTypeClass() == Type::Pointer || FromPtr-> getTypeClass() == Type::ObjCObjectPointer) && "Invalid similarly-qualified pointer type" ) ? static_cast<void> (0) : __assert_fail ("(FromPtr->getTypeClass() == Type::Pointer || FromPtr->getTypeClass() == Type::ObjCObjectPointer) && \"Invalid similarly-qualified pointer type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 2202, __PRETTY_FUNCTION__)); | ||||
2203 | |||||
2204 | /// Conversions to 'id' subsume cv-qualifier conversions. | ||||
2205 | if (ToType->isObjCIdType() || ToType->isObjCQualifiedIdType()) | ||||
2206 | return ToType.getUnqualifiedType(); | ||||
2207 | |||||
2208 | QualType CanonFromPointee | ||||
2209 | = Context.getCanonicalType(FromPtr->getPointeeType()); | ||||
2210 | QualType CanonToPointee = Context.getCanonicalType(ToPointee); | ||||
2211 | Qualifiers Quals = CanonFromPointee.getQualifiers(); | ||||
2212 | |||||
2213 | if (StripObjCLifetime) | ||||
2214 | Quals.removeObjCLifetime(); | ||||
2215 | |||||
2216 | // Exact qualifier match -> return the pointer type we're converting to. | ||||
2217 | if (CanonToPointee.getLocalQualifiers() == Quals) { | ||||
2218 | // ToType is exactly what we need. Return it. | ||||
2219 | if (!ToType.isNull()) | ||||
2220 | return ToType.getUnqualifiedType(); | ||||
2221 | |||||
2222 | // Build a pointer to ToPointee. It has the right qualifiers | ||||
2223 | // already. | ||||
2224 | if (isa<ObjCObjectPointerType>(ToType)) | ||||
2225 | return Context.getObjCObjectPointerType(ToPointee); | ||||
2226 | return Context.getPointerType(ToPointee); | ||||
2227 | } | ||||
2228 | |||||
2229 | // Just build a canonical type that has the right qualifiers. | ||||
2230 | QualType QualifiedCanonToPointee | ||||
2231 | = Context.getQualifiedType(CanonToPointee.getLocalUnqualifiedType(), Quals); | ||||
2232 | |||||
2233 | if (isa<ObjCObjectPointerType>(ToType)) | ||||
2234 | return Context.getObjCObjectPointerType(QualifiedCanonToPointee); | ||||
2235 | return Context.getPointerType(QualifiedCanonToPointee); | ||||
2236 | } | ||||
2237 | |||||
2238 | static bool isNullPointerConstantForConversion(Expr *Expr, | ||||
2239 | bool InOverloadResolution, | ||||
2240 | ASTContext &Context) { | ||||
2241 | // Handle value-dependent integral null pointer constants correctly. | ||||
2242 | // http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903 | ||||
2243 | if (Expr->isValueDependent() && !Expr->isTypeDependent() && | ||||
2244 | Expr->getType()->isIntegerType() && !Expr->getType()->isEnumeralType()) | ||||
2245 | return !InOverloadResolution; | ||||
2246 | |||||
2247 | return Expr->isNullPointerConstant(Context, | ||||
2248 | InOverloadResolution? Expr::NPC_ValueDependentIsNotNull | ||||
2249 | : Expr::NPC_ValueDependentIsNull); | ||||
2250 | } | ||||
2251 | |||||
2252 | /// IsPointerConversion - Determines whether the conversion of the | ||||
2253 | /// expression From, which has the (possibly adjusted) type FromType, | ||||
2254 | /// can be converted to the type ToType via a pointer conversion (C++ | ||||
2255 | /// 4.10). If so, returns true and places the converted type (that | ||||
2256 | /// might differ from ToType in its cv-qualifiers at some level) into | ||||
2257 | /// ConvertedType. | ||||
2258 | /// | ||||
2259 | /// This routine also supports conversions to and from block pointers | ||||
2260 | /// and conversions with Objective-C's 'id', 'id<protocols...>', and | ||||
2261 | /// pointers to interfaces. FIXME: Once we've determined the | ||||
2262 | /// appropriate overloading rules for Objective-C, we may want to | ||||
2263 | /// split the Objective-C checks into a different routine; however, | ||||
2264 | /// GCC seems to consider all of these conversions to be pointer | ||||
2265 | /// conversions, so for now they live here. IncompatibleObjC will be | ||||
2266 | /// set if the conversion is an allowed Objective-C conversion that | ||||
2267 | /// should result in a warning. | ||||
2268 | bool Sema::IsPointerConversion(Expr *From, QualType FromType, QualType ToType, | ||||
2269 | bool InOverloadResolution, | ||||
2270 | QualType& ConvertedType, | ||||
2271 | bool &IncompatibleObjC) { | ||||
2272 | IncompatibleObjC = false; | ||||
2273 | if (isObjCPointerConversion(FromType, ToType, ConvertedType, | ||||
2274 | IncompatibleObjC)) | ||||
2275 | return true; | ||||
2276 | |||||
2277 | // Conversion from a null pointer constant to any Objective-C pointer type. | ||||
2278 | if (ToType->isObjCObjectPointerType() && | ||||
2279 | isNullPointerConstantForConversion(From, InOverloadResolution, Context)) { | ||||
2280 | ConvertedType = ToType; | ||||
2281 | return true; | ||||
2282 | } | ||||
2283 | |||||
2284 | // Blocks: Block pointers can be converted to void*. | ||||
2285 | if (FromType->isBlockPointerType() && ToType->isPointerType() && | ||||
2286 | ToType->castAs<PointerType>()->getPointeeType()->isVoidType()) { | ||||
2287 | ConvertedType = ToType; | ||||
2288 | return true; | ||||
2289 | } | ||||
2290 | // Blocks: A null pointer constant can be converted to a block | ||||
2291 | // pointer type. | ||||
2292 | if (ToType->isBlockPointerType() && | ||||
2293 | isNullPointerConstantForConversion(From, InOverloadResolution, Context)) { | ||||
2294 | ConvertedType = ToType; | ||||
2295 | return true; | ||||
2296 | } | ||||
2297 | |||||
2298 | // If the left-hand-side is nullptr_t, the right side can be a null | ||||
2299 | // pointer constant. | ||||
2300 | if (ToType->isNullPtrType() && | ||||
2301 | isNullPointerConstantForConversion(From, InOverloadResolution, Context)) { | ||||
2302 | ConvertedType = ToType; | ||||
2303 | return true; | ||||
2304 | } | ||||
2305 | |||||
2306 | const PointerType* ToTypePtr = ToType->getAs<PointerType>(); | ||||
2307 | if (!ToTypePtr) | ||||
2308 | return false; | ||||
2309 | |||||
2310 | // A null pointer constant can be converted to a pointer type (C++ 4.10p1). | ||||
2311 | if (isNullPointerConstantForConversion(From, InOverloadResolution, Context)) { | ||||
2312 | ConvertedType = ToType; | ||||
2313 | return true; | ||||
2314 | } | ||||
2315 | |||||
2316 | // Beyond this point, both types need to be pointers | ||||
2317 | // , including objective-c pointers. | ||||
2318 | QualType ToPointeeType = ToTypePtr->getPointeeType(); | ||||
2319 | if (FromType->isObjCObjectPointerType() && ToPointeeType->isVoidType() && | ||||
2320 | !getLangOpts().ObjCAutoRefCount) { | ||||
2321 | ConvertedType = BuildSimilarlyQualifiedPointerType( | ||||
2322 | FromType->getAs<ObjCObjectPointerType>(), | ||||
2323 | ToPointeeType, | ||||
2324 | ToType, Context); | ||||
2325 | return true; | ||||
2326 | } | ||||
2327 | const PointerType *FromTypePtr = FromType->getAs<PointerType>(); | ||||
2328 | if (!FromTypePtr) | ||||
2329 | return false; | ||||
2330 | |||||
2331 | QualType FromPointeeType = FromTypePtr->getPointeeType(); | ||||
2332 | |||||
2333 | // If the unqualified pointee types are the same, this can't be a | ||||
2334 | // pointer conversion, so don't do all of the work below. | ||||
2335 | if (Context.hasSameUnqualifiedType(FromPointeeType, ToPointeeType)) | ||||
2336 | return false; | ||||
2337 | |||||
2338 | // An rvalue of type "pointer to cv T," where T is an object type, | ||||
2339 | // can be converted to an rvalue of type "pointer to cv void" (C++ | ||||
2340 | // 4.10p2). | ||||
2341 | if (FromPointeeType->isIncompleteOrObjectType() && | ||||
2342 | ToPointeeType->isVoidType()) { | ||||
2343 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, | ||||
2344 | ToPointeeType, | ||||
2345 | ToType, Context, | ||||
2346 | /*StripObjCLifetime=*/true); | ||||
2347 | return true; | ||||
2348 | } | ||||
2349 | |||||
2350 | // MSVC allows implicit function to void* type conversion. | ||||
2351 | if (getLangOpts().MSVCCompat && FromPointeeType->isFunctionType() && | ||||
2352 | ToPointeeType->isVoidType()) { | ||||
2353 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, | ||||
2354 | ToPointeeType, | ||||
2355 | ToType, Context); | ||||
2356 | return true; | ||||
2357 | } | ||||
2358 | |||||
2359 | // When we're overloading in C, we allow a special kind of pointer | ||||
2360 | // conversion for compatible-but-not-identical pointee types. | ||||
2361 | if (!getLangOpts().CPlusPlus && | ||||
2362 | Context.typesAreCompatible(FromPointeeType, ToPointeeType)) { | ||||
2363 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, | ||||
2364 | ToPointeeType, | ||||
2365 | ToType, Context); | ||||
2366 | return true; | ||||
2367 | } | ||||
2368 | |||||
2369 | // C++ [conv.ptr]p3: | ||||
2370 | // | ||||
2371 | // An rvalue of type "pointer to cv D," where D is a class type, | ||||
2372 | // can be converted to an rvalue of type "pointer to cv B," where | ||||
2373 | // B is a base class (clause 10) of D. If B is an inaccessible | ||||
2374 | // (clause 11) or ambiguous (10.2) base class of D, a program that | ||||
2375 | // necessitates this conversion is ill-formed. The result of the | ||||
2376 | // conversion is a pointer to the base class sub-object of the | ||||
2377 | // derived class object. The null pointer value is converted to | ||||
2378 | // the null pointer value of the destination type. | ||||
2379 | // | ||||
2380 | // Note that we do not check for ambiguity or inaccessibility | ||||
2381 | // here. That is handled by CheckPointerConversion. | ||||
2382 | if (getLangOpts().CPlusPlus && FromPointeeType->isRecordType() && | ||||
2383 | ToPointeeType->isRecordType() && | ||||
2384 | !Context.hasSameUnqualifiedType(FromPointeeType, ToPointeeType) && | ||||
2385 | IsDerivedFrom(From->getBeginLoc(), FromPointeeType, ToPointeeType)) { | ||||
2386 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, | ||||
2387 | ToPointeeType, | ||||
2388 | ToType, Context); | ||||
2389 | return true; | ||||
2390 | } | ||||
2391 | |||||
2392 | if (FromPointeeType->isVectorType() && ToPointeeType->isVectorType() && | ||||
2393 | Context.areCompatibleVectorTypes(FromPointeeType, ToPointeeType)) { | ||||
2394 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, | ||||
2395 | ToPointeeType, | ||||
2396 | ToType, Context); | ||||
2397 | return true; | ||||
2398 | } | ||||
2399 | |||||
2400 | return false; | ||||
2401 | } | ||||
2402 | |||||
2403 | /// Adopt the given qualifiers for the given type. | ||||
2404 | static QualType AdoptQualifiers(ASTContext &Context, QualType T, Qualifiers Qs){ | ||||
2405 | Qualifiers TQs = T.getQualifiers(); | ||||
2406 | |||||
2407 | // Check whether qualifiers already match. | ||||
2408 | if (TQs == Qs) | ||||
2409 | return T; | ||||
2410 | |||||
2411 | if (Qs.compatiblyIncludes(TQs)) | ||||
2412 | return Context.getQualifiedType(T, Qs); | ||||
2413 | |||||
2414 | return Context.getQualifiedType(T.getUnqualifiedType(), Qs); | ||||
2415 | } | ||||
2416 | |||||
2417 | /// isObjCPointerConversion - Determines whether this is an | ||||
2418 | /// Objective-C pointer conversion. Subroutine of IsPointerConversion, | ||||
2419 | /// with the same arguments and return values. | ||||
2420 | bool Sema::isObjCPointerConversion(QualType FromType, QualType ToType, | ||||
2421 | QualType& ConvertedType, | ||||
2422 | bool &IncompatibleObjC) { | ||||
2423 | if (!getLangOpts().ObjC) | ||||
2424 | return false; | ||||
2425 | |||||
2426 | // The set of qualifiers on the type we're converting from. | ||||
2427 | Qualifiers FromQualifiers = FromType.getQualifiers(); | ||||
2428 | |||||
2429 | // First, we handle all conversions on ObjC object pointer types. | ||||
2430 | const ObjCObjectPointerType* ToObjCPtr = | ||||
2431 | ToType->getAs<ObjCObjectPointerType>(); | ||||
2432 | const ObjCObjectPointerType *FromObjCPtr = | ||||
2433 | FromType->getAs<ObjCObjectPointerType>(); | ||||
2434 | |||||
2435 | if (ToObjCPtr && FromObjCPtr) { | ||||
2436 | // If the pointee types are the same (ignoring qualifications), | ||||
2437 | // then this is not a pointer conversion. | ||||
2438 | if (Context.hasSameUnqualifiedType(ToObjCPtr->getPointeeType(), | ||||
2439 | FromObjCPtr->getPointeeType())) | ||||
2440 | return false; | ||||
2441 | |||||
2442 | // Conversion between Objective-C pointers. | ||||
2443 | if (Context.canAssignObjCInterfaces(ToObjCPtr, FromObjCPtr)) { | ||||
2444 | const ObjCInterfaceType* LHS = ToObjCPtr->getInterfaceType(); | ||||
2445 | const ObjCInterfaceType* RHS = FromObjCPtr->getInterfaceType(); | ||||
2446 | if (getLangOpts().CPlusPlus && LHS && RHS && | ||||
2447 | !ToObjCPtr->getPointeeType().isAtLeastAsQualifiedAs( | ||||
2448 | FromObjCPtr->getPointeeType())) | ||||
2449 | return false; | ||||
2450 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromObjCPtr, | ||||
2451 | ToObjCPtr->getPointeeType(), | ||||
2452 | ToType, Context); | ||||
2453 | ConvertedType = AdoptQualifiers(Context, ConvertedType, FromQualifiers); | ||||
2454 | return true; | ||||
2455 | } | ||||
2456 | |||||
2457 | if (Context.canAssignObjCInterfaces(FromObjCPtr, ToObjCPtr)) { | ||||
2458 | // Okay: this is some kind of implicit downcast of Objective-C | ||||
2459 | // interfaces, which is permitted. However, we're going to | ||||
2460 | // complain about it. | ||||
2461 | IncompatibleObjC = true; | ||||
2462 | ConvertedType = BuildSimilarlyQualifiedPointerType(FromObjCPtr, | ||||
2463 | ToObjCPtr->getPointeeType(), | ||||
2464 | ToType, Context); | ||||
2465 | ConvertedType = AdoptQualifiers(Context, ConvertedType, FromQualifiers); | ||||
2466 | return true; | ||||
2467 | } | ||||
2468 | } | ||||
2469 | // Beyond this point, both types need to be C pointers or block pointers. | ||||
2470 | QualType ToPointeeType; | ||||
2471 | if (const PointerType *ToCPtr = ToType->getAs<PointerType>()) | ||||
2472 | ToPointeeType = ToCPtr->getPointeeType(); | ||||
2473 | else if (const BlockPointerType *ToBlockPtr = | ||||
2474 | ToType->getAs<BlockPointerType>()) { | ||||
2475 | // Objective C++: We're able to convert from a pointer to any object | ||||
2476 | // to a block pointer type. | ||||
2477 | if (FromObjCPtr && FromObjCPtr->isObjCBuiltinType()) { | ||||
2478 | ConvertedType = AdoptQualifiers(Context, ToType, FromQualifiers); | ||||
2479 | return true; | ||||
2480 | } | ||||
2481 | ToPointeeType = ToBlockPtr->getPointeeType(); | ||||
2482 | } | ||||
2483 | else if (FromType->getAs<BlockPointerType>() && | ||||
2484 | ToObjCPtr && ToObjCPtr->isObjCBuiltinType()) { | ||||
2485 | // Objective C++: We're able to convert from a block pointer type to a | ||||
2486 | // pointer to any object. | ||||
2487 | ConvertedType = AdoptQualifiers(Context, ToType, FromQualifiers); | ||||
2488 | return true; | ||||
2489 | } | ||||
2490 | else | ||||
2491 | return false; | ||||
2492 | |||||
2493 | QualType FromPointeeType; | ||||
2494 | if (const PointerType *FromCPtr = FromType->getAs<PointerType>()) | ||||
2495 | FromPointeeType = FromCPtr->getPointeeType(); | ||||
2496 | else if (const BlockPointerType *FromBlockPtr = | ||||
2497 | FromType->getAs<BlockPointerType>()) | ||||
2498 | FromPointeeType = FromBlockPtr->getPointeeType(); | ||||
2499 | else | ||||
2500 | return false; | ||||
2501 | |||||
2502 | // If we have pointers to pointers, recursively check whether this | ||||
2503 | // is an Objective-C conversion. | ||||
2504 | if (FromPointeeType->isPointerType() && ToPointeeType->isPointerType() && | ||||
2505 | isObjCPointerConversion(FromPointeeType, ToPointeeType, ConvertedType, | ||||
2506 | IncompatibleObjC)) { | ||||
2507 | // We always complain about this conversion. | ||||
2508 | IncompatibleObjC = true; | ||||
2509 | ConvertedType = Context.getPointerType(ConvertedType); | ||||
2510 | ConvertedType = AdoptQualifiers(Context, ConvertedType, FromQualifiers); | ||||
2511 | return true; | ||||
2512 | } | ||||
2513 | // Allow conversion of pointee being objective-c pointer to another one; | ||||
2514 | // as in I* to id. | ||||
2515 | if (FromPointeeType->getAs<ObjCObjectPointerType>() && | ||||
2516 | ToPointeeType->getAs<ObjCObjectPointerType>() && | ||||
2517 | isObjCPointerConversion(FromPointeeType, ToPointeeType, ConvertedType, | ||||
2518 | IncompatibleObjC)) { | ||||
2519 | |||||
2520 | ConvertedType = Context.getPointerType(ConvertedType); | ||||
2521 | ConvertedType = AdoptQualifiers(Context, ConvertedType, FromQualifiers); | ||||
2522 | return true; | ||||
2523 | } | ||||
2524 | |||||
2525 | // If we have pointers to functions or blocks, check whether the only | ||||
2526 | // differences in the argument and result types are in Objective-C | ||||
2527 | // pointer conversions. If so, we permit the conversion (but | ||||
2528 | // complain about it). | ||||
2529 | const FunctionProtoType *FromFunctionType | ||||
2530 | = FromPointeeType->getAs<FunctionProtoType>(); | ||||
2531 | const FunctionProtoType *ToFunctionType | ||||
2532 | = ToPointeeType->getAs<FunctionProtoType>(); | ||||
2533 | if (FromFunctionType && ToFunctionType) { | ||||
2534 | // If the function types are exactly the same, this isn't an | ||||
2535 | // Objective-C pointer conversion. | ||||
2536 | if (Context.getCanonicalType(FromPointeeType) | ||||
2537 | == Context.getCanonicalType(ToPointeeType)) | ||||
2538 | return false; | ||||
2539 | |||||
2540 | // Perform the quick checks that will tell us whether these | ||||
2541 | // function types are obviously different. | ||||
2542 | if (FromFunctionType->getNumParams() != ToFunctionType->getNumParams() || | ||||
2543 | FromFunctionType->isVariadic() != ToFunctionType->isVariadic() || | ||||
2544 | FromFunctionType->getMethodQuals() != ToFunctionType->getMethodQuals()) | ||||
2545 | return false; | ||||
2546 | |||||
2547 | bool HasObjCConversion = false; | ||||
2548 | if (Context.getCanonicalType(FromFunctionType->getReturnType()) == | ||||
2549 | Context.getCanonicalType(ToFunctionType->getReturnType())) { | ||||
2550 | // Okay, the types match exactly. Nothing to do. | ||||
2551 | } else if (isObjCPointerConversion(FromFunctionType->getReturnType(), | ||||
2552 | ToFunctionType->getReturnType(), | ||||
2553 | ConvertedType, IncompatibleObjC)) { | ||||
2554 | // Okay, we have an Objective-C pointer conversion. | ||||
2555 | HasObjCConversion = true; | ||||
2556 | } else { | ||||
2557 | // Function types are too different. Abort. | ||||
2558 | return false; | ||||
2559 | } | ||||
2560 | |||||
2561 | // Check argument types. | ||||
2562 | for (unsigned ArgIdx = 0, NumArgs = FromFunctionType->getNumParams(); | ||||
2563 | ArgIdx != NumArgs; ++ArgIdx) { | ||||
2564 | QualType FromArgType = FromFunctionType->getParamType(ArgIdx); | ||||
2565 | QualType ToArgType = ToFunctionType->getParamType(ArgIdx); | ||||
2566 | if (Context.getCanonicalType(FromArgType) | ||||
2567 | == Context.getCanonicalType(ToArgType)) { | ||||
2568 | // Okay, the types match exactly. Nothing to do. | ||||
2569 | } else if (isObjCPointerConversion(FromArgType, ToArgType, | ||||
2570 | ConvertedType, IncompatibleObjC)) { | ||||
2571 | // Okay, we have an Objective-C pointer conversion. | ||||
2572 | HasObjCConversion = true; | ||||
2573 | } else { | ||||
2574 | // Argument types are too different. Abort. | ||||
2575 | return false; | ||||
2576 | } | ||||
2577 | } | ||||
2578 | |||||
2579 | if (HasObjCConversion) { | ||||
2580 | // We had an Objective-C conversion. Allow this pointer | ||||
2581 | // conversion, but complain about it. | ||||
2582 | ConvertedType = AdoptQualifiers(Context, ToType, FromQualifiers); | ||||
2583 | IncompatibleObjC = true; | ||||
2584 | return true; | ||||
2585 | } | ||||
2586 | } | ||||
2587 | |||||
2588 | return false; | ||||
2589 | } | ||||
2590 | |||||
2591 | /// Determine whether this is an Objective-C writeback conversion, | ||||
2592 | /// used for parameter passing when performing automatic reference counting. | ||||
2593 | /// | ||||
2594 | /// \param FromType The type we're converting form. | ||||
2595 | /// | ||||
2596 | /// \param ToType The type we're converting to. | ||||
2597 | /// | ||||
2598 | /// \param ConvertedType The type that will be produced after applying | ||||
2599 | /// this conversion. | ||||
2600 | bool Sema::isObjCWritebackConversion(QualType FromType, QualType ToType, | ||||
2601 | QualType &ConvertedType) { | ||||
2602 | if (!getLangOpts().ObjCAutoRefCount || | ||||
2603 | Context.hasSameUnqualifiedType(FromType, ToType)) | ||||
2604 | return false; | ||||
2605 | |||||
2606 | // Parameter must be a pointer to __autoreleasing (with no other qualifiers). | ||||
2607 | QualType ToPointee; | ||||
2608 | if (const PointerType *ToPointer = ToType->getAs<PointerType>()) | ||||
2609 | ToPointee = ToPointer->getPointeeType(); | ||||
2610 | else | ||||
2611 | return false; | ||||
2612 | |||||
2613 | Qualifiers ToQuals = ToPointee.getQualifiers(); | ||||
2614 | if (!ToPointee->isObjCLifetimeType() || | ||||
2615 | ToQuals.getObjCLifetime() != Qualifiers::OCL_Autoreleasing || | ||||
2616 | !ToQuals.withoutObjCLifetime().empty()) | ||||
2617 | return false; | ||||
2618 | |||||
2619 | // Argument must be a pointer to __strong to __weak. | ||||
2620 | QualType FromPointee; | ||||
2621 | if (const PointerType *FromPointer = FromType->getAs<PointerType>()) | ||||
2622 | FromPointee = FromPointer->getPointeeType(); | ||||
2623 | else | ||||
2624 | return false; | ||||
2625 | |||||
2626 | Qualifiers FromQuals = FromPointee.getQualifiers(); | ||||
2627 | if (!FromPointee->isObjCLifetimeType() || | ||||
2628 | (FromQuals.getObjCLifetime() != Qualifiers::OCL_Strong && | ||||
2629 | FromQuals.getObjCLifetime() != Qualifiers::OCL_Weak)) | ||||
2630 | return false; | ||||
2631 | |||||
2632 | // Make sure that we have compatible qualifiers. | ||||
2633 | FromQuals.setObjCLifetime(Qualifiers::OCL_Autoreleasing); | ||||
2634 | if (!ToQuals.compatiblyIncludes(FromQuals)) | ||||
2635 | return false; | ||||
2636 | |||||
2637 | // Remove qualifiers from the pointee type we're converting from; they | ||||
2638 | // aren't used in the compatibility check belong, and we'll be adding back | ||||
2639 | // qualifiers (with __autoreleasing) if the compatibility check succeeds. | ||||
2640 | FromPointee = FromPointee.getUnqualifiedType(); | ||||
2641 | |||||
2642 | // The unqualified form of the pointee types must be compatible. | ||||
2643 | ToPointee = ToPointee.getUnqualifiedType(); | ||||
2644 | bool IncompatibleObjC; | ||||
2645 | if (Context.typesAreCompatible(FromPointee, ToPointee)) | ||||
2646 | FromPointee = ToPointee; | ||||
2647 | else if (!isObjCPointerConversion(FromPointee, ToPointee, FromPointee, | ||||
2648 | IncompatibleObjC)) | ||||
2649 | return false; | ||||
2650 | |||||
2651 | /// Construct the type we're converting to, which is a pointer to | ||||
2652 | /// __autoreleasing pointee. | ||||
2653 | FromPointee = Context.getQualifiedType(FromPointee, FromQuals); | ||||
2654 | ConvertedType = Context.getPointerType(FromPointee); | ||||
2655 | return true; | ||||
2656 | } | ||||
2657 | |||||
2658 | bool Sema::IsBlockPointerConversion(QualType FromType, QualType ToType, | ||||
2659 | QualType& ConvertedType) { | ||||
2660 | QualType ToPointeeType; | ||||
2661 | if (const BlockPointerType *ToBlockPtr = | ||||
2662 | ToType->getAs<BlockPointerType>()) | ||||
2663 | ToPointeeType = ToBlockPtr->getPointeeType(); | ||||
2664 | else | ||||
2665 | return false; | ||||
2666 | |||||
2667 | QualType FromPointeeType; | ||||
2668 | if (const BlockPointerType *FromBlockPtr = | ||||
2669 | FromType->getAs<BlockPointerType>()) | ||||
2670 | FromPointeeType = FromBlockPtr->getPointeeType(); | ||||
2671 | else | ||||
2672 | return false; | ||||
2673 | // We have pointer to blocks, check whether the only | ||||
2674 | // differences in the argument and result types are in Objective-C | ||||
2675 | // pointer conversions. If so, we permit the conversion. | ||||
2676 | |||||
2677 | const FunctionProtoType *FromFunctionType | ||||
2678 | = FromPointeeType->getAs<FunctionProtoType>(); | ||||
2679 | const FunctionProtoType *ToFunctionType | ||||
2680 | = ToPointeeType->getAs<FunctionProtoType>(); | ||||
2681 | |||||
2682 | if (!FromFunctionType || !ToFunctionType) | ||||
2683 | return false; | ||||
2684 | |||||
2685 | if (Context.hasSameType(FromPointeeType, ToPointeeType)) | ||||
2686 | return true; | ||||
2687 | |||||
2688 | // Perform the quick checks that will tell us whether these | ||||
2689 | // function types are obviously different. | ||||
2690 | if (FromFunctionType->getNumParams() != ToFunctionType->getNumParams() || | ||||
2691 | FromFunctionType->isVariadic() != ToFunctionType->isVariadic()) | ||||
2692 | return false; | ||||
2693 | |||||
2694 | FunctionType::ExtInfo FromEInfo = FromFunctionType->getExtInfo(); | ||||
2695 | FunctionType::ExtInfo ToEInfo = ToFunctionType->getExtInfo(); | ||||
2696 | if (FromEInfo != ToEInfo) | ||||
2697 | return false; | ||||
2698 | |||||
2699 | bool IncompatibleObjC = false; | ||||
2700 | if (Context.hasSameType(FromFunctionType->getReturnType(), | ||||
2701 | ToFunctionType->getReturnType())) { | ||||
2702 | // Okay, the types match exactly. Nothing to do. | ||||
2703 | } else { | ||||
2704 | QualType RHS = FromFunctionType->getReturnType(); | ||||
2705 | QualType LHS = ToFunctionType->getReturnType(); | ||||
2706 | if ((!getLangOpts().CPlusPlus || !RHS->isRecordType()) && | ||||
2707 | !RHS.hasQualifiers() && LHS.hasQualifiers()) | ||||
2708 | LHS = LHS.getUnqualifiedType(); | ||||
2709 | |||||
2710 | if (Context.hasSameType(RHS,LHS)) { | ||||
2711 | // OK exact match. | ||||
2712 | } else if (isObjCPointerConversion(RHS, LHS, | ||||
2713 | ConvertedType, IncompatibleObjC)) { | ||||
2714 | if (IncompatibleObjC) | ||||
2715 | return false; | ||||
2716 | // Okay, we have an Objective-C pointer conversion. | ||||
2717 | } | ||||
2718 | else | ||||
2719 | return false; | ||||
2720 | } | ||||
2721 | |||||
2722 | // Check argument types. | ||||
2723 | for (unsigned ArgIdx = 0, NumArgs = FromFunctionType->getNumParams(); | ||||
2724 | ArgIdx != NumArgs; ++ArgIdx) { | ||||
2725 | IncompatibleObjC = false; | ||||
2726 | QualType FromArgType = FromFunctionType->getParamType(ArgIdx); | ||||
2727 | QualType ToArgType = ToFunctionType->getParamType(ArgIdx); | ||||
2728 | if (Context.hasSameType(FromArgType, ToArgType)) { | ||||
2729 | // Okay, the types match exactly. Nothing to do. | ||||
2730 | } else if (isObjCPointerConversion(ToArgType, FromArgType, | ||||
2731 | ConvertedType, IncompatibleObjC)) { | ||||
2732 | if (IncompatibleObjC) | ||||
2733 | return false; | ||||
2734 | // Okay, we have an Objective-C pointer conversion. | ||||
2735 | } else | ||||
2736 | // Argument types are too different. Abort. | ||||
2737 | return false; | ||||
2738 | } | ||||
2739 | |||||
2740 | SmallVector<FunctionProtoType::ExtParameterInfo, 4> NewParamInfos; | ||||
2741 | bool CanUseToFPT, CanUseFromFPT; | ||||
2742 | if (!Context.mergeExtParameterInfo(ToFunctionType, FromFunctionType, | ||||
2743 | CanUseToFPT, CanUseFromFPT, | ||||
2744 | NewParamInfos)) | ||||
2745 | return false; | ||||
2746 | |||||
2747 | ConvertedType = ToType; | ||||
2748 | return true; | ||||
2749 | } | ||||
2750 | |||||
2751 | enum { | ||||
2752 | ft_default, | ||||
2753 | ft_different_class, | ||||
2754 | ft_parameter_arity, | ||||
2755 | ft_parameter_mismatch, | ||||
2756 | ft_return_type, | ||||
2757 | ft_qualifer_mismatch, | ||||
2758 | ft_noexcept | ||||
2759 | }; | ||||
2760 | |||||
2761 | /// Attempts to get the FunctionProtoType from a Type. Handles | ||||
2762 | /// MemberFunctionPointers properly. | ||||
2763 | static const FunctionProtoType *tryGetFunctionProtoType(QualType FromType) { | ||||
2764 | if (auto *FPT = FromType->getAs<FunctionProtoType>()) | ||||
2765 | return FPT; | ||||
2766 | |||||
2767 | if (auto *MPT = FromType->getAs<MemberPointerType>()) | ||||
2768 | return MPT->getPointeeType()->getAs<FunctionProtoType>(); | ||||
2769 | |||||
2770 | return nullptr; | ||||
2771 | } | ||||
2772 | |||||
2773 | /// HandleFunctionTypeMismatch - Gives diagnostic information for differeing | ||||
2774 | /// function types. Catches different number of parameter, mismatch in | ||||
2775 | /// parameter types, and different return types. | ||||
2776 | void Sema::HandleFunctionTypeMismatch(PartialDiagnostic &PDiag, | ||||
2777 | QualType FromType, QualType ToType) { | ||||
2778 | // If either type is not valid, include no extra info. | ||||
2779 | if (FromType.isNull() || ToType.isNull()) { | ||||
2780 | PDiag << ft_default; | ||||
2781 | return; | ||||
2782 | } | ||||
2783 | |||||
2784 | // Get the function type from the pointers. | ||||
2785 | if (FromType->isMemberPointerType() && ToType->isMemberPointerType()) { | ||||
2786 | const MemberPointerType *FromMember = FromType->getAs<MemberPointerType>(), | ||||
2787 | *ToMember = ToType->getAs<MemberPointerType>(); | ||||
2788 | if (!Context.hasSameType(FromMember->getClass(), ToMember->getClass())) { | ||||
2789 | PDiag << ft_different_class << QualType(ToMember->getClass(), 0) | ||||
2790 | << QualType(FromMember->getClass(), 0); | ||||
2791 | return; | ||||
2792 | } | ||||
2793 | FromType = FromMember->getPointeeType(); | ||||
2794 | ToType = ToMember->getPointeeType(); | ||||
2795 | } | ||||
2796 | |||||
2797 | if (FromType->isPointerType()) | ||||
2798 | FromType = FromType->getPointeeType(); | ||||
2799 | if (ToType->isPointerType()) | ||||
2800 | ToType = ToType->getPointeeType(); | ||||
2801 | |||||
2802 | // Remove references. | ||||
2803 | FromType = FromType.getNonReferenceType(); | ||||
2804 | ToType = ToType.getNonReferenceType(); | ||||
2805 | |||||
2806 | // Don't print extra info for non-specialized template functions. | ||||
2807 | if (FromType->isInstantiationDependentType() && | ||||
2808 | !FromType->getAs<TemplateSpecializationType>()) { | ||||
2809 | PDiag << ft_default; | ||||
2810 | return; | ||||
2811 | } | ||||
2812 | |||||
2813 | // No extra info for same types. | ||||
2814 | if (Context.hasSameType(FromType, ToType)) { | ||||
2815 | PDiag << ft_default; | ||||
2816 | return; | ||||
2817 | } | ||||
2818 | |||||
2819 | const FunctionProtoType *FromFunction = tryGetFunctionProtoType(FromType), | ||||
2820 | *ToFunction = tryGetFunctionProtoType(ToType); | ||||
2821 | |||||
2822 | // Both types need to be function types. | ||||
2823 | if (!FromFunction || !ToFunction) { | ||||
2824 | PDiag << ft_default; | ||||
2825 | return; | ||||
2826 | } | ||||
2827 | |||||
2828 | if (FromFunction->getNumParams() != ToFunction->getNumParams()) { | ||||
2829 | PDiag << ft_parameter_arity << ToFunction->getNumParams() | ||||
2830 | << FromFunction->getNumParams(); | ||||
2831 | return; | ||||
2832 | } | ||||
2833 | |||||
2834 | // Handle different parameter types. | ||||
2835 | unsigned ArgPos; | ||||
2836 | if (!FunctionParamTypesAreEqual(FromFunction, ToFunction, &ArgPos)) { | ||||
2837 | PDiag << ft_parameter_mismatch << ArgPos + 1 | ||||
2838 | << ToFunction->getParamType(ArgPos) | ||||
2839 | << FromFunction->getParamType(ArgPos); | ||||
2840 | return; | ||||
2841 | } | ||||
2842 | |||||
2843 | // Handle different return type. | ||||
2844 | if (!Context.hasSameType(FromFunction->getReturnType(), | ||||
2845 | ToFunction->getReturnType())) { | ||||
2846 | PDiag << ft_return_type << ToFunction->getReturnType() | ||||
2847 | << FromFunction->getReturnType(); | ||||
2848 | return; | ||||
2849 | } | ||||
2850 | |||||
2851 | if (FromFunction->getMethodQuals() != ToFunction->getMethodQuals()) { | ||||
2852 | PDiag << ft_qualifer_mismatch << ToFunction->getMethodQuals() | ||||
2853 | << FromFunction->getMethodQuals(); | ||||
2854 | return; | ||||
2855 | } | ||||
2856 | |||||
2857 | // Handle exception specification differences on canonical type (in C++17 | ||||
2858 | // onwards). | ||||
2859 | if (cast<FunctionProtoType>(FromFunction->getCanonicalTypeUnqualified()) | ||||
2860 | ->isNothrow() != | ||||
2861 | cast<FunctionProtoType>(ToFunction->getCanonicalTypeUnqualified()) | ||||
2862 | ->isNothrow()) { | ||||
2863 | PDiag << ft_noexcept; | ||||
2864 | return; | ||||
2865 | } | ||||
2866 | |||||
2867 | // Unable to find a difference, so add no extra info. | ||||
2868 | PDiag << ft_default; | ||||
2869 | } | ||||
2870 | |||||
2871 | /// FunctionParamTypesAreEqual - This routine checks two function proto types | ||||
2872 | /// for equality of their argument types. Caller has already checked that | ||||
2873 | /// they have same number of arguments. If the parameters are different, | ||||
2874 | /// ArgPos will have the parameter index of the first different parameter. | ||||
2875 | bool Sema::FunctionParamTypesAreEqual(const FunctionProtoType *OldType, | ||||
2876 | const FunctionProtoType *NewType, | ||||
2877 | unsigned *ArgPos) { | ||||
2878 | for (FunctionProtoType::param_type_iterator O = OldType->param_type_begin(), | ||||
2879 | N = NewType->param_type_begin(), | ||||
2880 | E = OldType->param_type_end(); | ||||
2881 | O && (O != E); ++O, ++N) { | ||||
2882 | if (!Context.hasSameType(O->getUnqualifiedType(), | ||||
2883 | N->getUnqualifiedType())) { | ||||
2884 | if (ArgPos) | ||||
2885 | *ArgPos = O - OldType->param_type_begin(); | ||||
2886 | return false; | ||||
2887 | } | ||||
2888 | } | ||||
2889 | return true; | ||||
2890 | } | ||||
2891 | |||||
2892 | /// CheckPointerConversion - Check the pointer conversion from the | ||||
2893 | /// expression From to the type ToType. This routine checks for | ||||
2894 | /// ambiguous or inaccessible derived-to-base pointer | ||||
2895 | /// conversions for which IsPointerConversion has already returned | ||||
2896 | /// true. It returns true and produces a diagnostic if there was an | ||||
2897 | /// error, or returns false otherwise. | ||||
2898 | bool Sema::CheckPointerConversion(Expr *From, QualType ToType, | ||||
2899 | CastKind &Kind, | ||||
2900 | CXXCastPath& BasePath, | ||||
2901 | bool IgnoreBaseAccess, | ||||
2902 | bool Diagnose) { | ||||
2903 | QualType FromType = From->getType(); | ||||
2904 | bool IsCStyleOrFunctionalCast = IgnoreBaseAccess; | ||||
2905 | |||||
2906 | Kind = CK_BitCast; | ||||
2907 | |||||
2908 | if (Diagnose && !IsCStyleOrFunctionalCast && !FromType->isAnyPointerType() && | ||||
2909 | From->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull) == | ||||
2910 | Expr::NPCK_ZeroExpression) { | ||||
2911 | if (Context.hasSameUnqualifiedType(From->getType(), Context.BoolTy)) | ||||
2912 | DiagRuntimeBehavior(From->getExprLoc(), From, | ||||
2913 | PDiag(diag::warn_impcast_bool_to_null_pointer) | ||||
2914 | << ToType << From->getSourceRange()); | ||||
2915 | else if (!isUnevaluatedContext()) | ||||
2916 | Diag(From->getExprLoc(), diag::warn_non_literal_null_pointer) | ||||
2917 | << ToType << From->getSourceRange(); | ||||
2918 | } | ||||
2919 | if (const PointerType *ToPtrType = ToType->getAs<PointerType>()) { | ||||
2920 | if (const PointerType *FromPtrType = FromType->getAs<PointerType>()) { | ||||
2921 | QualType FromPointeeType = FromPtrType->getPointeeType(), | ||||
2922 | ToPointeeType = ToPtrType->getPointeeType(); | ||||
2923 | |||||
2924 | if (FromPointeeType->isRecordType() && ToPointeeType->isRecordType() && | ||||
2925 | !Context.hasSameUnqualifiedType(FromPointeeType, ToPointeeType)) { | ||||
2926 | // We must have a derived-to-base conversion. Check an | ||||
2927 | // ambiguous or inaccessible conversion. | ||||
2928 | unsigned InaccessibleID = 0; | ||||
2929 | unsigned AmbigiousID = 0; | ||||
2930 | if (Diagnose) { | ||||
2931 | InaccessibleID = diag::err_upcast_to_inaccessible_base; | ||||
2932 | AmbigiousID = diag::err_ambiguous_derived_to_base_conv; | ||||
2933 | } | ||||
2934 | if (CheckDerivedToBaseConversion( | ||||
2935 | FromPointeeType, ToPointeeType, InaccessibleID, AmbigiousID, | ||||
2936 | From->getExprLoc(), From->getSourceRange(), DeclarationName(), | ||||
2937 | &BasePath, IgnoreBaseAccess)) | ||||
2938 | return true; | ||||
2939 | |||||
2940 | // The conversion was successful. | ||||
2941 | Kind = CK_DerivedToBase; | ||||
2942 | } | ||||
2943 | |||||
2944 | if (Diagnose && !IsCStyleOrFunctionalCast && | ||||
2945 | FromPointeeType->isFunctionType() && ToPointeeType->isVoidType()) { | ||||
2946 | assert(getLangOpts().MSVCCompat &&((getLangOpts().MSVCCompat && "this should only be possible with MSVCCompat!" ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().MSVCCompat && \"this should only be possible with MSVCCompat!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 2947, __PRETTY_FUNCTION__)) | ||||
2947 | "this should only be possible with MSVCCompat!")((getLangOpts().MSVCCompat && "this should only be possible with MSVCCompat!" ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().MSVCCompat && \"this should only be possible with MSVCCompat!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 2947, __PRETTY_FUNCTION__)); | ||||
2948 | Diag(From->getExprLoc(), diag::ext_ms_impcast_fn_obj) | ||||
2949 | << From->getSourceRange(); | ||||
2950 | } | ||||
2951 | } | ||||
2952 | } else if (const ObjCObjectPointerType *ToPtrType = | ||||
2953 | ToType->getAs<ObjCObjectPointerType>()) { | ||||
2954 | if (const ObjCObjectPointerType *FromPtrType = | ||||
2955 | FromType->getAs<ObjCObjectPointerType>()) { | ||||
2956 | // Objective-C++ conversions are always okay. | ||||
2957 | // FIXME: We should have a different class of conversions for the | ||||
2958 | // Objective-C++ implicit conversions. | ||||
2959 | if (FromPtrType->isObjCBuiltinType() || ToPtrType->isObjCBuiltinType()) | ||||
2960 | return false; | ||||
2961 | } else if (FromType->isBlockPointerType()) { | ||||
2962 | Kind = CK_BlockPointerToObjCPointerCast; | ||||
2963 | } else { | ||||
2964 | Kind = CK_CPointerToObjCPointerCast; | ||||
2965 | } | ||||
2966 | } else if (ToType->isBlockPointerType()) { | ||||
2967 | if (!FromType->isBlockPointerType()) | ||||
2968 | Kind = CK_AnyPointerToBlockPointerCast; | ||||
2969 | } | ||||
2970 | |||||
2971 | // We shouldn't fall into this case unless it's valid for other | ||||
2972 | // reasons. | ||||
2973 | if (From->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) | ||||
2974 | Kind = CK_NullToPointer; | ||||
2975 | |||||
2976 | return false; | ||||
2977 | } | ||||
2978 | |||||
2979 | /// IsMemberPointerConversion - Determines whether the conversion of the | ||||
2980 | /// expression From, which has the (possibly adjusted) type FromType, can be | ||||
2981 | /// converted to the type ToType via a member pointer conversion (C++ 4.11). | ||||
2982 | /// If so, returns true and places the converted type (that might differ from | ||||
2983 | /// ToType in its cv-qualifiers at some level) into ConvertedType. | ||||
2984 | bool Sema::IsMemberPointerConversion(Expr *From, QualType FromType, | ||||
2985 | QualType ToType, | ||||
2986 | bool InOverloadResolution, | ||||
2987 | QualType &ConvertedType) { | ||||
2988 | const MemberPointerType *ToTypePtr = ToType->getAs<MemberPointerType>(); | ||||
2989 | if (!ToTypePtr) | ||||
2990 | return false; | ||||
2991 | |||||
2992 | // A null pointer constant can be converted to a member pointer (C++ 4.11p1) | ||||
2993 | if (From->isNullPointerConstant(Context, | ||||
2994 | InOverloadResolution? Expr::NPC_ValueDependentIsNotNull | ||||
2995 | : Expr::NPC_ValueDependentIsNull)) { | ||||
2996 | ConvertedType = ToType; | ||||
2997 | return true; | ||||
2998 | } | ||||
2999 | |||||
3000 | // Otherwise, both types have to be member pointers. | ||||
3001 | const MemberPointerType *FromTypePtr = FromType->getAs<MemberPointerType>(); | ||||
3002 | if (!FromTypePtr) | ||||
3003 | return false; | ||||
3004 | |||||
3005 | // A pointer to member of B can be converted to a pointer to member of D, | ||||
3006 | // where D is derived from B (C++ 4.11p2). | ||||
3007 | QualType FromClass(FromTypePtr->getClass(), 0); | ||||
3008 | QualType ToClass(ToTypePtr->getClass(), 0); | ||||
3009 | |||||
3010 | if (!Context.hasSameUnqualifiedType(FromClass, ToClass) && | ||||
3011 | IsDerivedFrom(From->getBeginLoc(), ToClass, FromClass)) { | ||||
3012 | ConvertedType = Context.getMemberPointerType(FromTypePtr->getPointeeType(), | ||||
3013 | ToClass.getTypePtr()); | ||||
3014 | return true; | ||||
3015 | } | ||||
3016 | |||||
3017 | return false; | ||||
3018 | } | ||||
3019 | |||||
3020 | /// CheckMemberPointerConversion - Check the member pointer conversion from the | ||||
3021 | /// expression From to the type ToType. This routine checks for ambiguous or | ||||
3022 | /// virtual or inaccessible base-to-derived member pointer conversions | ||||
3023 | /// for which IsMemberPointerConversion has already returned true. It returns | ||||
3024 | /// true and produces a diagnostic if there was an error, or returns false | ||||
3025 | /// otherwise. | ||||
3026 | bool Sema::CheckMemberPointerConversion(Expr *From, QualType ToType, | ||||
3027 | CastKind &Kind, | ||||
3028 | CXXCastPath &BasePath, | ||||
3029 | bool IgnoreBaseAccess) { | ||||
3030 | QualType FromType = From->getType(); | ||||
3031 | const MemberPointerType *FromPtrType = FromType->getAs<MemberPointerType>(); | ||||
3032 | if (!FromPtrType) { | ||||
3033 | // This must be a null pointer to member pointer conversion | ||||
3034 | assert(From->isNullPointerConstant(Context,((From->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull ) && "Expr must be null pointer constant!") ? static_cast <void> (0) : __assert_fail ("From->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull) && \"Expr must be null pointer constant!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3036, __PRETTY_FUNCTION__)) | ||||
3035 | Expr::NPC_ValueDependentIsNull) &&((From->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull ) && "Expr must be null pointer constant!") ? static_cast <void> (0) : __assert_fail ("From->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull) && \"Expr must be null pointer constant!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3036, __PRETTY_FUNCTION__)) | ||||
3036 | "Expr must be null pointer constant!")((From->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull ) && "Expr must be null pointer constant!") ? static_cast <void> (0) : __assert_fail ("From->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull) && \"Expr must be null pointer constant!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3036, __PRETTY_FUNCTION__)); | ||||
3037 | Kind = CK_NullToMemberPointer; | ||||
3038 | return false; | ||||
3039 | } | ||||
3040 | |||||
3041 | const MemberPointerType *ToPtrType = ToType->getAs<MemberPointerType>(); | ||||
3042 | assert(ToPtrType && "No member pointer cast has a target type "((ToPtrType && "No member pointer cast has a target type " "that is not a member pointer.") ? static_cast<void> ( 0) : __assert_fail ("ToPtrType && \"No member pointer cast has a target type \" \"that is not a member pointer.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3043, __PRETTY_FUNCTION__)) | ||||
3043 | "that is not a member pointer.")((ToPtrType && "No member pointer cast has a target type " "that is not a member pointer.") ? static_cast<void> ( 0) : __assert_fail ("ToPtrType && \"No member pointer cast has a target type \" \"that is not a member pointer.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3043, __PRETTY_FUNCTION__)); | ||||
3044 | |||||
3045 | QualType FromClass = QualType(FromPtrType->getClass(), 0); | ||||
3046 | QualType ToClass = QualType(ToPtrType->getClass(), 0); | ||||
3047 | |||||
3048 | // FIXME: What about dependent types? | ||||
3049 | assert(FromClass->isRecordType() && "Pointer into non-class.")((FromClass->isRecordType() && "Pointer into non-class." ) ? static_cast<void> (0) : __assert_fail ("FromClass->isRecordType() && \"Pointer into non-class.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3049, __PRETTY_FUNCTION__)); | ||||
3050 | assert(ToClass->isRecordType() && "Pointer into non-class.")((ToClass->isRecordType() && "Pointer into non-class." ) ? static_cast<void> (0) : __assert_fail ("ToClass->isRecordType() && \"Pointer into non-class.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3050, __PRETTY_FUNCTION__)); | ||||
3051 | |||||
3052 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, | ||||
3053 | /*DetectVirtual=*/true); | ||||
3054 | bool DerivationOkay = | ||||
3055 | IsDerivedFrom(From->getBeginLoc(), ToClass, FromClass, Paths); | ||||
3056 | assert(DerivationOkay &&((DerivationOkay && "Should not have been called if derivation isn't OK." ) ? static_cast<void> (0) : __assert_fail ("DerivationOkay && \"Should not have been called if derivation isn't OK.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3057, __PRETTY_FUNCTION__)) | ||||
3057 | "Should not have been called if derivation isn't OK.")((DerivationOkay && "Should not have been called if derivation isn't OK." ) ? static_cast<void> (0) : __assert_fail ("DerivationOkay && \"Should not have been called if derivation isn't OK.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3057, __PRETTY_FUNCTION__)); | ||||
3058 | (void)DerivationOkay; | ||||
3059 | |||||
3060 | if (Paths.isAmbiguous(Context.getCanonicalType(FromClass). | ||||
3061 | getUnqualifiedType())) { | ||||
3062 | std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); | ||||
3063 | Diag(From->getExprLoc(), diag::err_ambiguous_memptr_conv) | ||||
3064 | << 0 << FromClass << ToClass << PathDisplayStr << From->getSourceRange(); | ||||
3065 | return true; | ||||
3066 | } | ||||
3067 | |||||
3068 | if (const RecordType *VBase = Paths.getDetectedVirtual()) { | ||||
3069 | Diag(From->getExprLoc(), diag::err_memptr_conv_via_virtual) | ||||
3070 | << FromClass << ToClass << QualType(VBase, 0) | ||||
3071 | << From->getSourceRange(); | ||||
3072 | return true; | ||||
3073 | } | ||||
3074 | |||||
3075 | if (!IgnoreBaseAccess) | ||||
3076 | CheckBaseClassAccess(From->getExprLoc(), FromClass, ToClass, | ||||
3077 | Paths.front(), | ||||
3078 | diag::err_downcast_from_inaccessible_base); | ||||
3079 | |||||
3080 | // Must be a base to derived member conversion. | ||||
3081 | BuildBasePathArray(Paths, BasePath); | ||||
3082 | Kind = CK_BaseToDerivedMemberPointer; | ||||
3083 | return false; | ||||
3084 | } | ||||
3085 | |||||
3086 | /// Determine whether the lifetime conversion between the two given | ||||
3087 | /// qualifiers sets is nontrivial. | ||||
3088 | static bool isNonTrivialObjCLifetimeConversion(Qualifiers FromQuals, | ||||
3089 | Qualifiers ToQuals) { | ||||
3090 | // Converting anything to const __unsafe_unretained is trivial. | ||||
3091 | if (ToQuals.hasConst() && | ||||
3092 | ToQuals.getObjCLifetime() == Qualifiers::OCL_ExplicitNone) | ||||
3093 | return false; | ||||
3094 | |||||
3095 | return true; | ||||
3096 | } | ||||
3097 | |||||
3098 | /// IsQualificationConversion - Determines whether the conversion from | ||||
3099 | /// an rvalue of type FromType to ToType is a qualification conversion | ||||
3100 | /// (C++ 4.4). | ||||
3101 | /// | ||||
3102 | /// \param ObjCLifetimeConversion Output parameter that will be set to indicate | ||||
3103 | /// when the qualification conversion involves a change in the Objective-C | ||||
3104 | /// object lifetime. | ||||
3105 | bool | ||||
3106 | Sema::IsQualificationConversion(QualType FromType, QualType ToType, | ||||
3107 | bool CStyle, bool &ObjCLifetimeConversion) { | ||||
3108 | FromType = Context.getCanonicalType(FromType); | ||||
3109 | ToType = Context.getCanonicalType(ToType); | ||||
3110 | ObjCLifetimeConversion = false; | ||||
3111 | |||||
3112 | // If FromType and ToType are the same type, this is not a | ||||
3113 | // qualification conversion. | ||||
3114 | if (FromType.getUnqualifiedType() == ToType.getUnqualifiedType()) | ||||
3115 | return false; | ||||
3116 | |||||
3117 | // (C++ 4.4p4): | ||||
3118 | // A conversion can add cv-qualifiers at levels other than the first | ||||
3119 | // in multi-level pointers, subject to the following rules: [...] | ||||
3120 | bool PreviousToQualsIncludeConst = true; | ||||
3121 | bool UnwrappedAnyPointer = false; | ||||
3122 | while (Context.UnwrapSimilarTypes(FromType, ToType)) { | ||||
3123 | // Within each iteration of the loop, we check the qualifiers to | ||||
3124 | // determine if this still looks like a qualification | ||||
3125 | // conversion. Then, if all is well, we unwrap one more level of | ||||
3126 | // pointers or pointers-to-members and do it all again | ||||
3127 | // until there are no more pointers or pointers-to-members left to | ||||
3128 | // unwrap. | ||||
3129 | UnwrappedAnyPointer = true; | ||||
3130 | |||||
3131 | Qualifiers FromQuals = FromType.getQualifiers(); | ||||
3132 | Qualifiers ToQuals = ToType.getQualifiers(); | ||||
3133 | |||||
3134 | // Ignore __unaligned qualifier if this type is void. | ||||
3135 | if (ToType.getUnqualifiedType()->isVoidType()) | ||||
3136 | FromQuals.removeUnaligned(); | ||||
3137 | |||||
3138 | // Objective-C ARC: | ||||
3139 | // Check Objective-C lifetime conversions. | ||||
3140 | if (FromQuals.getObjCLifetime() != ToQuals.getObjCLifetime() && | ||||
3141 | UnwrappedAnyPointer) { | ||||
3142 | if (ToQuals.compatiblyIncludesObjCLifetime(FromQuals)) { | ||||
3143 | if (isNonTrivialObjCLifetimeConversion(FromQuals, ToQuals)) | ||||
3144 | ObjCLifetimeConversion = true; | ||||
3145 | FromQuals.removeObjCLifetime(); | ||||
3146 | ToQuals.removeObjCLifetime(); | ||||
3147 | } else { | ||||
3148 | // Qualification conversions cannot cast between different | ||||
3149 | // Objective-C lifetime qualifiers. | ||||
3150 | return false; | ||||
3151 | } | ||||
3152 | } | ||||
3153 | |||||
3154 | // Allow addition/removal of GC attributes but not changing GC attributes. | ||||
3155 | if (FromQuals.getObjCGCAttr() != ToQuals.getObjCGCAttr() && | ||||
3156 | (!FromQuals.hasObjCGCAttr() || !ToQuals.hasObjCGCAttr())) { | ||||
3157 | FromQuals.removeObjCGCAttr(); | ||||
3158 | ToQuals.removeObjCGCAttr(); | ||||
3159 | } | ||||
3160 | |||||
3161 | // -- for every j > 0, if const is in cv 1,j then const is in cv | ||||
3162 | // 2,j, and similarly for volatile. | ||||
3163 | if (!CStyle && !ToQuals.compatiblyIncludes(FromQuals)) | ||||
3164 | return false; | ||||
3165 | |||||
3166 | // -- if the cv 1,j and cv 2,j are different, then const is in | ||||
3167 | // every cv for 0 < k < j. | ||||
3168 | if (!CStyle && FromQuals.getCVRQualifiers() != ToQuals.getCVRQualifiers() | ||||
3169 | && !PreviousToQualsIncludeConst) | ||||
3170 | return false; | ||||
3171 | |||||
3172 | // Keep track of whether all prior cv-qualifiers in the "to" type | ||||
3173 | // include const. | ||||
3174 | PreviousToQualsIncludeConst | ||||
3175 | = PreviousToQualsIncludeConst && ToQuals.hasConst(); | ||||
3176 | } | ||||
3177 | |||||
3178 | // Allows address space promotion by language rules implemented in | ||||
3179 | // Type::Qualifiers::isAddressSpaceSupersetOf. | ||||
3180 | Qualifiers FromQuals = FromType.getQualifiers(); | ||||
3181 | Qualifiers ToQuals = ToType.getQualifiers(); | ||||
3182 | if (!ToQuals.isAddressSpaceSupersetOf(FromQuals) && | ||||
3183 | !FromQuals.isAddressSpaceSupersetOf(ToQuals)) { | ||||
3184 | return false; | ||||
3185 | } | ||||
3186 | |||||
3187 | // We are left with FromType and ToType being the pointee types | ||||
3188 | // after unwrapping the original FromType and ToType the same number | ||||
3189 | // of types. If we unwrapped any pointers, and if FromType and | ||||
3190 | // ToType have the same unqualified type (since we checked | ||||
3191 | // qualifiers above), then this is a qualification conversion. | ||||
3192 | return UnwrappedAnyPointer && Context.hasSameUnqualifiedType(FromType,ToType); | ||||
3193 | } | ||||
3194 | |||||
3195 | /// - Determine whether this is a conversion from a scalar type to an | ||||
3196 | /// atomic type. | ||||
3197 | /// | ||||
3198 | /// If successful, updates \c SCS's second and third steps in the conversion | ||||
3199 | /// sequence to finish the conversion. | ||||
3200 | static bool tryAtomicConversion(Sema &S, Expr *From, QualType ToType, | ||||
3201 | bool InOverloadResolution, | ||||
3202 | StandardConversionSequence &SCS, | ||||
3203 | bool CStyle) { | ||||
3204 | const AtomicType *ToAtomic = ToType->getAs<AtomicType>(); | ||||
3205 | if (!ToAtomic) | ||||
3206 | return false; | ||||
3207 | |||||
3208 | StandardConversionSequence InnerSCS; | ||||
3209 | if (!IsStandardConversion(S, From, ToAtomic->getValueType(), | ||||
3210 | InOverloadResolution, InnerSCS, | ||||
3211 | CStyle, /*AllowObjCWritebackConversion=*/false)) | ||||
3212 | return false; | ||||
3213 | |||||
3214 | SCS.Second = InnerSCS.Second; | ||||
3215 | SCS.setToType(1, InnerSCS.getToType(1)); | ||||
3216 | SCS.Third = InnerSCS.Third; | ||||
3217 | SCS.QualificationIncludesObjCLifetime | ||||
3218 | = InnerSCS.QualificationIncludesObjCLifetime; | ||||
3219 | SCS.setToType(2, InnerSCS.getToType(2)); | ||||
3220 | return true; | ||||
3221 | } | ||||
3222 | |||||
3223 | static bool isFirstArgumentCompatibleWithType(ASTContext &Context, | ||||
3224 | CXXConstructorDecl *Constructor, | ||||
3225 | QualType Type) { | ||||
3226 | const FunctionProtoType *CtorType = | ||||
3227 | Constructor->getType()->getAs<FunctionProtoType>(); | ||||
3228 | if (CtorType->getNumParams() > 0) { | ||||
3229 | QualType FirstArg = CtorType->getParamType(0); | ||||
3230 | if (Context.hasSameUnqualifiedType(Type, FirstArg.getNonReferenceType())) | ||||
3231 | return true; | ||||
3232 | } | ||||
3233 | return false; | ||||
3234 | } | ||||
3235 | |||||
3236 | static OverloadingResult | ||||
3237 | IsInitializerListConstructorConversion(Sema &S, Expr *From, QualType ToType, | ||||
3238 | CXXRecordDecl *To, | ||||
3239 | UserDefinedConversionSequence &User, | ||||
3240 | OverloadCandidateSet &CandidateSet, | ||||
3241 | bool AllowExplicit) { | ||||
3242 | CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion); | ||||
3243 | for (auto *D : S.LookupConstructors(To)) { | ||||
3244 | auto Info = getConstructorInfo(D); | ||||
3245 | if (!Info) | ||||
3246 | continue; | ||||
3247 | |||||
3248 | bool Usable = !Info.Constructor->isInvalidDecl() && | ||||
3249 | S.isInitListConstructor(Info.Constructor) && | ||||
3250 | (AllowExplicit || !Info.Constructor->isExplicit()); | ||||
3251 | if (Usable) { | ||||
3252 | // If the first argument is (a reference to) the target type, | ||||
3253 | // suppress conversions. | ||||
3254 | bool SuppressUserConversions = isFirstArgumentCompatibleWithType( | ||||
3255 | S.Context, Info.Constructor, ToType); | ||||
3256 | if (Info.ConstructorTmpl) | ||||
3257 | S.AddTemplateOverloadCandidate(Info.ConstructorTmpl, Info.FoundDecl, | ||||
3258 | /*ExplicitArgs*/ nullptr, From, | ||||
3259 | CandidateSet, SuppressUserConversions, | ||||
3260 | /*PartialOverloading*/ false, | ||||
3261 | AllowExplicit); | ||||
3262 | else | ||||
3263 | S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl, From, | ||||
3264 | CandidateSet, SuppressUserConversions, | ||||
3265 | /*PartialOverloading*/ false, AllowExplicit); | ||||
3266 | } | ||||
3267 | } | ||||
3268 | |||||
3269 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | ||||
3270 | |||||
3271 | OverloadCandidateSet::iterator Best; | ||||
3272 | switch (auto Result = | ||||
3273 | CandidateSet.BestViableFunction(S, From->getBeginLoc(), Best)) { | ||||
3274 | case OR_Deleted: | ||||
3275 | case OR_Success: { | ||||
3276 | // Record the standard conversion we used and the conversion function. | ||||
3277 | CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); | ||||
3278 | QualType ThisType = Constructor->getThisType(); | ||||
3279 | // Initializer lists don't have conversions as such. | ||||
3280 | User.Before.setAsIdentityConversion(); | ||||
3281 | User.HadMultipleCandidates = HadMultipleCandidates; | ||||
3282 | User.ConversionFunction = Constructor; | ||||
3283 | User.FoundConversionFunction = Best->FoundDecl; | ||||
3284 | User.After.setAsIdentityConversion(); | ||||
3285 | User.After.setFromType(ThisType->castAs<PointerType>()->getPointeeType()); | ||||
3286 | User.After.setAllToTypes(ToType); | ||||
3287 | return Result; | ||||
3288 | } | ||||
3289 | |||||
3290 | case OR_No_Viable_Function: | ||||
3291 | return OR_No_Viable_Function; | ||||
3292 | case OR_Ambiguous: | ||||
3293 | return OR_Ambiguous; | ||||
3294 | } | ||||
3295 | |||||
3296 | llvm_unreachable("Invalid OverloadResult!")::llvm::llvm_unreachable_internal("Invalid OverloadResult!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3296); | ||||
3297 | } | ||||
3298 | |||||
3299 | /// Determines whether there is a user-defined conversion sequence | ||||
3300 | /// (C++ [over.ics.user]) that converts expression From to the type | ||||
3301 | /// ToType. If such a conversion exists, User will contain the | ||||
3302 | /// user-defined conversion sequence that performs such a conversion | ||||
3303 | /// and this routine will return true. Otherwise, this routine returns | ||||
3304 | /// false and User is unspecified. | ||||
3305 | /// | ||||
3306 | /// \param AllowExplicit true if the conversion should consider C++0x | ||||
3307 | /// "explicit" conversion functions as well as non-explicit conversion | ||||
3308 | /// functions (C++0x [class.conv.fct]p2). | ||||
3309 | /// | ||||
3310 | /// \param AllowObjCConversionOnExplicit true if the conversion should | ||||
3311 | /// allow an extra Objective-C pointer conversion on uses of explicit | ||||
3312 | /// constructors. Requires \c AllowExplicit to also be set. | ||||
3313 | static OverloadingResult | ||||
3314 | IsUserDefinedConversion(Sema &S, Expr *From, QualType ToType, | ||||
3315 | UserDefinedConversionSequence &User, | ||||
3316 | OverloadCandidateSet &CandidateSet, | ||||
3317 | bool AllowExplicit, | ||||
3318 | bool AllowObjCConversionOnExplicit) { | ||||
3319 | assert(AllowExplicit || !AllowObjCConversionOnExplicit)((AllowExplicit || !AllowObjCConversionOnExplicit) ? static_cast <void> (0) : __assert_fail ("AllowExplicit || !AllowObjCConversionOnExplicit" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3319, __PRETTY_FUNCTION__)); | ||||
3320 | CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion); | ||||
3321 | |||||
3322 | // Whether we will only visit constructors. | ||||
3323 | bool ConstructorsOnly = false; | ||||
3324 | |||||
3325 | // If the type we are conversion to is a class type, enumerate its | ||||
3326 | // constructors. | ||||
3327 | if (const RecordType *ToRecordType = ToType->getAs<RecordType>()) { | ||||
3328 | // C++ [over.match.ctor]p1: | ||||
3329 | // When objects of class type are direct-initialized (8.5), or | ||||
3330 | // copy-initialized from an expression of the same or a | ||||
3331 | // derived class type (8.5), overload resolution selects the | ||||
3332 | // constructor. [...] For copy-initialization, the candidate | ||||
3333 | // functions are all the converting constructors (12.3.1) of | ||||
3334 | // that class. The argument list is the expression-list within | ||||
3335 | // the parentheses of the initializer. | ||||
3336 | if (S.Context.hasSameUnqualifiedType(ToType, From->getType()) || | ||||
3337 | (From->getType()->getAs<RecordType>() && | ||||
3338 | S.IsDerivedFrom(From->getBeginLoc(), From->getType(), ToType))) | ||||
3339 | ConstructorsOnly = true; | ||||
3340 | |||||
3341 | if (!S.isCompleteType(From->getExprLoc(), ToType)) { | ||||
3342 | // We're not going to find any constructors. | ||||
3343 | } else if (CXXRecordDecl *ToRecordDecl | ||||
3344 | = dyn_cast<CXXRecordDecl>(ToRecordType->getDecl())) { | ||||
3345 | |||||
3346 | Expr **Args = &From; | ||||
3347 | unsigned NumArgs = 1; | ||||
3348 | bool ListInitializing = false; | ||||
3349 | if (InitListExpr *InitList = dyn_cast<InitListExpr>(From)) { | ||||
3350 | // But first, see if there is an init-list-constructor that will work. | ||||
3351 | OverloadingResult Result = IsInitializerListConstructorConversion( | ||||
3352 | S, From, ToType, ToRecordDecl, User, CandidateSet, AllowExplicit); | ||||
3353 | if (Result != OR_No_Viable_Function) | ||||
3354 | return Result; | ||||
3355 | // Never mind. | ||||
3356 | CandidateSet.clear( | ||||
3357 | OverloadCandidateSet::CSK_InitByUserDefinedConversion); | ||||
3358 | |||||
3359 | // If we're list-initializing, we pass the individual elements as | ||||
3360 | // arguments, not the entire list. | ||||
3361 | Args = InitList->getInits(); | ||||
3362 | NumArgs = InitList->getNumInits(); | ||||
3363 | ListInitializing = true; | ||||
3364 | } | ||||
3365 | |||||
3366 | for (auto *D : S.LookupConstructors(ToRecordDecl)) { | ||||
3367 | auto Info = getConstructorInfo(D); | ||||
3368 | if (!Info) | ||||
3369 | continue; | ||||
3370 | |||||
3371 | bool Usable = !Info.Constructor->isInvalidDecl(); | ||||
3372 | if (ListInitializing) | ||||
3373 | Usable = Usable && (AllowExplicit || !Info.Constructor->isExplicit()); | ||||
3374 | else | ||||
3375 | Usable = Usable && | ||||
3376 | Info.Constructor->isConvertingConstructor(AllowExplicit); | ||||
3377 | if (Usable) { | ||||
3378 | bool SuppressUserConversions = !ConstructorsOnly; | ||||
3379 | if (SuppressUserConversions && ListInitializing) { | ||||
3380 | SuppressUserConversions = false; | ||||
3381 | if (NumArgs == 1) { | ||||
3382 | // If the first argument is (a reference to) the target type, | ||||
3383 | // suppress conversions. | ||||
3384 | SuppressUserConversions = isFirstArgumentCompatibleWithType( | ||||
3385 | S.Context, Info.Constructor, ToType); | ||||
3386 | } | ||||
3387 | } | ||||
3388 | if (Info.ConstructorTmpl) | ||||
3389 | S.AddTemplateOverloadCandidate( | ||||
3390 | Info.ConstructorTmpl, Info.FoundDecl, | ||||
3391 | /*ExplicitArgs*/ nullptr, llvm::makeArrayRef(Args, NumArgs), | ||||
3392 | CandidateSet, SuppressUserConversions, | ||||
3393 | /*PartialOverloading*/ false, AllowExplicit); | ||||
3394 | else | ||||
3395 | // Allow one user-defined conversion when user specifies a | ||||
3396 | // From->ToType conversion via an static cast (c-style, etc). | ||||
3397 | S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl, | ||||
3398 | llvm::makeArrayRef(Args, NumArgs), | ||||
3399 | CandidateSet, SuppressUserConversions, | ||||
3400 | /*PartialOverloading*/ false, AllowExplicit); | ||||
3401 | } | ||||
3402 | } | ||||
3403 | } | ||||
3404 | } | ||||
3405 | |||||
3406 | // Enumerate conversion functions, if we're allowed to. | ||||
3407 | if (ConstructorsOnly || isa<InitListExpr>(From)) { | ||||
3408 | } else if (!S.isCompleteType(From->getBeginLoc(), From->getType())) { | ||||
3409 | // No conversion functions from incomplete types. | ||||
3410 | } else if (const RecordType *FromRecordType = | ||||
3411 | From->getType()->getAs<RecordType>()) { | ||||
3412 | if (CXXRecordDecl *FromRecordDecl | ||||
3413 | = dyn_cast<CXXRecordDecl>(FromRecordType->getDecl())) { | ||||
3414 | // Add all of the conversion functions as candidates. | ||||
3415 | const auto &Conversions = FromRecordDecl->getVisibleConversionFunctions(); | ||||
3416 | for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) { | ||||
3417 | DeclAccessPair FoundDecl = I.getPair(); | ||||
3418 | NamedDecl *D = FoundDecl.getDecl(); | ||||
3419 | CXXRecordDecl *ActingContext = cast<CXXRecordDecl>(D->getDeclContext()); | ||||
3420 | if (isa<UsingShadowDecl>(D)) | ||||
3421 | D = cast<UsingShadowDecl>(D)->getTargetDecl(); | ||||
3422 | |||||
3423 | CXXConversionDecl *Conv; | ||||
3424 | FunctionTemplateDecl *ConvTemplate; | ||||
3425 | if ((ConvTemplate = dyn_cast<FunctionTemplateDecl>(D))) | ||||
3426 | Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); | ||||
3427 | else | ||||
3428 | Conv = cast<CXXConversionDecl>(D); | ||||
3429 | |||||
3430 | if (AllowExplicit || !Conv->isExplicit()) { | ||||
3431 | if (ConvTemplate) | ||||
3432 | S.AddTemplateConversionCandidate( | ||||
3433 | ConvTemplate, FoundDecl, ActingContext, From, ToType, | ||||
3434 | CandidateSet, AllowObjCConversionOnExplicit, AllowExplicit); | ||||
3435 | else | ||||
3436 | S.AddConversionCandidate( | ||||
3437 | Conv, FoundDecl, ActingContext, From, ToType, CandidateSet, | ||||
3438 | AllowObjCConversionOnExplicit, AllowExplicit); | ||||
3439 | } | ||||
3440 | } | ||||
3441 | } | ||||
3442 | } | ||||
3443 | |||||
3444 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | ||||
3445 | |||||
3446 | OverloadCandidateSet::iterator Best; | ||||
3447 | switch (auto Result = | ||||
3448 | CandidateSet.BestViableFunction(S, From->getBeginLoc(), Best)) { | ||||
3449 | case OR_Success: | ||||
3450 | case OR_Deleted: | ||||
3451 | // Record the standard conversion we used and the conversion function. | ||||
3452 | if (CXXConstructorDecl *Constructor | ||||
3453 | = dyn_cast<CXXConstructorDecl>(Best->Function)) { | ||||
3454 | // C++ [over.ics.user]p1: | ||||
3455 | // If the user-defined conversion is specified by a | ||||
3456 | // constructor (12.3.1), the initial standard conversion | ||||
3457 | // sequence converts the source type to the type required by | ||||
3458 | // the argument of the constructor. | ||||
3459 | // | ||||
3460 | QualType ThisType = Constructor->getThisType(); | ||||
3461 | if (isa<InitListExpr>(From)) { | ||||
3462 | // Initializer lists don't have conversions as such. | ||||
3463 | User.Before.setAsIdentityConversion(); | ||||
3464 | } else { | ||||
3465 | if (Best->Conversions[0].isEllipsis()) | ||||
3466 | User.EllipsisConversion = true; | ||||
3467 | else { | ||||
3468 | User.Before = Best->Conversions[0].Standard; | ||||
3469 | User.EllipsisConversion = false; | ||||
3470 | } | ||||
3471 | } | ||||
3472 | User.HadMultipleCandidates = HadMultipleCandidates; | ||||
3473 | User.ConversionFunction = Constructor; | ||||
3474 | User.FoundConversionFunction = Best->FoundDecl; | ||||
3475 | User.After.setAsIdentityConversion(); | ||||
3476 | User.After.setFromType(ThisType->castAs<PointerType>()->getPointeeType()); | ||||
3477 | User.After.setAllToTypes(ToType); | ||||
3478 | return Result; | ||||
3479 | } | ||||
3480 | if (CXXConversionDecl *Conversion | ||||
3481 | = dyn_cast<CXXConversionDecl>(Best->Function)) { | ||||
3482 | // C++ [over.ics.user]p1: | ||||
3483 | // | ||||
3484 | // [...] If the user-defined conversion is specified by a | ||||
3485 | // conversion function (12.3.2), the initial standard | ||||
3486 | // conversion sequence converts the source type to the | ||||
3487 | // implicit object parameter of the conversion function. | ||||
3488 | User.Before = Best->Conversions[0].Standard; | ||||
3489 | User.HadMultipleCandidates = HadMultipleCandidates; | ||||
3490 | User.ConversionFunction = Conversion; | ||||
3491 | User.FoundConversionFunction = Best->FoundDecl; | ||||
3492 | User.EllipsisConversion = false; | ||||
3493 | |||||
3494 | // C++ [over.ics.user]p2: | ||||
3495 | // The second standard conversion sequence converts the | ||||
3496 | // result of the user-defined conversion to the target type | ||||
3497 | // for the sequence. Since an implicit conversion sequence | ||||
3498 | // is an initialization, the special rules for | ||||
3499 | // initialization by user-defined conversion apply when | ||||
3500 | // selecting the best user-defined conversion for a | ||||
3501 | // user-defined conversion sequence (see 13.3.3 and | ||||
3502 | // 13.3.3.1). | ||||
3503 | User.After = Best->FinalConversion; | ||||
3504 | return Result; | ||||
3505 | } | ||||
3506 | llvm_unreachable("Not a constructor or conversion function?")::llvm::llvm_unreachable_internal("Not a constructor or conversion function?" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3506); | ||||
3507 | |||||
3508 | case OR_No_Viable_Function: | ||||
3509 | return OR_No_Viable_Function; | ||||
3510 | |||||
3511 | case OR_Ambiguous: | ||||
3512 | return OR_Ambiguous; | ||||
3513 | } | ||||
3514 | |||||
3515 | llvm_unreachable("Invalid OverloadResult!")::llvm::llvm_unreachable_internal("Invalid OverloadResult!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 3515); | ||||
3516 | } | ||||
3517 | |||||
3518 | bool | ||||
3519 | Sema::DiagnoseMultipleUserDefinedConversion(Expr *From, QualType ToType) { | ||||
3520 | ImplicitConversionSequence ICS; | ||||
3521 | OverloadCandidateSet CandidateSet(From->getExprLoc(), | ||||
3522 | OverloadCandidateSet::CSK_Normal); | ||||
3523 | OverloadingResult OvResult = | ||||
3524 | IsUserDefinedConversion(*this, From, ToType, ICS.UserDefined, | ||||
3525 | CandidateSet, false, false); | ||||
3526 | |||||
3527 | if (!(OvResult == OR_Ambiguous || | ||||
3528 | (OvResult == OR_No_Viable_Function && !CandidateSet.empty()))) | ||||
3529 | return false; | ||||
3530 | |||||
3531 | auto Cands = CandidateSet.CompleteCandidates(*this, OCD_AllCandidates, From); | ||||
3532 | if (OvResult == OR_Ambiguous) | ||||
3533 | Diag(From->getBeginLoc(), diag::err_typecheck_ambiguous_condition) | ||||
3534 | << From->getType() << ToType << From->getSourceRange(); | ||||
3535 | else { // OR_No_Viable_Function && !CandidateSet.empty() | ||||
3536 | if (!RequireCompleteType(From->getBeginLoc(), ToType, | ||||
3537 | diag::err_typecheck_nonviable_condition_incomplete, | ||||
3538 | From->getType(), From->getSourceRange())) | ||||
3539 | Diag(From->getBeginLoc(), diag::err_typecheck_nonviable_condition) | ||||
3540 | << false << From->getType() << From->getSourceRange() << ToType; | ||||
3541 | } | ||||
3542 | |||||
3543 | CandidateSet.NoteCandidates( | ||||
3544 | *this, From, Cands); | ||||
3545 | return true; | ||||
3546 | } | ||||
3547 | |||||
3548 | /// Compare the user-defined conversion functions or constructors | ||||
3549 | /// of two user-defined conversion sequences to determine whether any ordering | ||||
3550 | /// is possible. | ||||
3551 | static ImplicitConversionSequence::CompareKind | ||||
3552 | compareConversionFunctions(Sema &S, FunctionDecl *Function1, | ||||
3553 | FunctionDecl *Function2) { | ||||
3554 | if (!S.getLangOpts().ObjC || !S.getLangOpts().CPlusPlus11) | ||||
3555 | return ImplicitConversionSequence::Indistinguishable; | ||||
3556 | |||||
3557 | // Objective-C++: | ||||
3558 | // If both conversion functions are implicitly-declared conversions from | ||||
3559 | // a lambda closure type to a function pointer and a block pointer, | ||||
3560 | // respectively, always prefer the conversion to a function pointer, | ||||
3561 | // because the function pointer is more lightweight and is more likely | ||||
3562 | // to keep code working. | ||||
3563 | CXXConversionDecl *Conv1 = dyn_cast_or_null<CXXConversionDecl>(Function1); | ||||
3564 | if (!Conv1) | ||||
3565 | return ImplicitConversionSequence::Indistinguishable; | ||||
3566 | |||||
3567 | CXXConversionDecl *Conv2 = dyn_cast<CXXConversionDecl>(Function2); | ||||
3568 | if (!Conv2) | ||||
3569 | return ImplicitConversionSequence::Indistinguishable; | ||||
3570 | |||||
3571 | if (Conv1->getParent()->isLambda() && Conv2->getParent()->isLambda()) { | ||||
3572 | bool Block1 = Conv1->getConversionType()->isBlockPointerType(); | ||||
3573 | bool Block2 = Conv2->getConversionType()->isBlockPointerType(); | ||||
3574 | if (Block1 != Block2) | ||||
3575 | return Block1 ? ImplicitConversionSequence::Worse | ||||
3576 | : ImplicitConversionSequence::Better; | ||||
3577 | } | ||||
3578 | |||||
3579 | return ImplicitConversionSequence::Indistinguishable; | ||||
3580 | } | ||||
3581 | |||||
3582 | static bool hasDeprecatedStringLiteralToCharPtrConversion( | ||||
3583 | const ImplicitConversionSequence &ICS) { | ||||
3584 | return (ICS.isStandard() && ICS.Standard.DeprecatedStringLiteralToCharPtr) || | ||||
3585 | (ICS.isUserDefined() && | ||||
3586 | ICS.UserDefined.Before.DeprecatedStringLiteralToCharPtr); | ||||
3587 | } | ||||
3588 | |||||
3589 | /// CompareImplicitConversionSequences - Compare two implicit | ||||
3590 | /// conversion sequences to determine whether one is better than the | ||||
3591 | /// other or if they are indistinguishable (C++ 13.3.3.2). | ||||
3592 | static ImplicitConversionSequence::CompareKind | ||||
3593 | CompareImplicitConversionSequences(Sema &S, SourceLocation Loc, | ||||
3594 | const ImplicitConversionSequence& ICS1, | ||||
3595 | const ImplicitConversionSequence& ICS2) | ||||
3596 | { | ||||
3597 | // (C++ 13.3.3.2p2): When comparing the basic forms of implicit | ||||
3598 | // conversion sequences (as defined in 13.3.3.1) | ||||
3599 | // -- a standard conversion sequence (13.3.3.1.1) is a better | ||||
3600 | // conversion sequence than a user-defined conversion sequence or | ||||
3601 | // an ellipsis conversion sequence, and | ||||
3602 | // -- a user-defined conversion sequence (13.3.3.1.2) is a better | ||||
3603 | // conversion sequence than an ellipsis conversion sequence | ||||
3604 | // (13.3.3.1.3). | ||||
3605 | // | ||||
3606 | // C++0x [over.best.ics]p10: | ||||
3607 | // For the purpose of ranking implicit conversion sequences as | ||||
3608 | // described in 13.3.3.2, the ambiguous conversion sequence is | ||||
3609 | // treated as a user-defined sequence that is indistinguishable | ||||
3610 | // from any other user-defined conversion sequence. | ||||
3611 | |||||
3612 | // String literal to 'char *' conversion has been deprecated in C++03. It has | ||||
3613 | // been removed from C++11. We still accept this conversion, if it happens at | ||||
3614 | // the best viable function. Otherwise, this conversion is considered worse | ||||
3615 | // than ellipsis conversion. Consider this as an extension; this is not in the | ||||
3616 | // standard. For example: | ||||
3617 | // | ||||
3618 | // int &f(...); // #1 | ||||
3619 | // void f(char*); // #2 | ||||
3620 | // void g() { int &r = f("foo"); } | ||||
3621 | // | ||||
3622 | // In C++03, we pick #2 as the best viable function. | ||||
3623 | // In C++11, we pick #1 as the best viable function, because ellipsis | ||||
3624 | // conversion is better than string-literal to char* conversion (since there | ||||
3625 | // is no such conversion in C++11). If there was no #1 at all or #1 couldn't | ||||
3626 | // convert arguments, #2 would be the best viable function in C++11. | ||||
3627 | // If the best viable function has this conversion, a warning will be issued | ||||
3628 | // in C++03, or an ExtWarn (+SFINAE failure) will be issued in C++11. | ||||
3629 | |||||
3630 | if (S.getLangOpts().CPlusPlus11 && !S.getLangOpts().WritableStrings && | ||||
3631 | hasDeprecatedStringLiteralToCharPtrConversion(ICS1) != | ||||
3632 | hasDeprecatedStringLiteralToCharPtrConversion(ICS2)) | ||||
3633 | return hasDeprecatedStringLiteralToCharPtrConversion(ICS1) | ||||
3634 | ? ImplicitConversionSequence::Worse | ||||
3635 | : ImplicitConversionSequence::Better; | ||||
3636 | |||||
3637 | if (ICS1.getKindRank() < ICS2.getKindRank()) | ||||
3638 | return ImplicitConversionSequence::Better; | ||||
3639 | if (ICS2.getKindRank() < ICS1.getKindRank()) | ||||
3640 | return ImplicitConversionSequence::Worse; | ||||
3641 | |||||
3642 | // The following checks require both conversion sequences to be of | ||||
3643 | // the same kind. | ||||
3644 | if (ICS1.getKind() != ICS2.getKind()) | ||||
3645 | return ImplicitConversionSequence::Indistinguishable; | ||||
3646 | |||||
3647 | ImplicitConversionSequence::CompareKind Result = | ||||
3648 | ImplicitConversionSequence::Indistinguishable; | ||||
3649 | |||||
3650 | // Two implicit conversion sequences of the same form are | ||||
3651 | // indistinguishable conversion sequences unless one of the | ||||
3652 | // following rules apply: (C++ 13.3.3.2p3): | ||||
3653 | |||||
3654 | // List-initialization sequence L1 is a better conversion sequence than | ||||
3655 | // list-initialization sequence L2 if: | ||||
3656 | // - L1 converts to std::initializer_list<X> for some X and L2 does not, or, | ||||
3657 | // if not that, | ||||
3658 | // - L1 converts to type "array of N1 T", L2 converts to type "array of N2 T", | ||||
3659 | // and N1 is smaller than N2., | ||||
3660 | // even if one of the other rules in this paragraph would otherwise apply. | ||||
3661 | if (!ICS1.isBad()) { | ||||
3662 | if (ICS1.isStdInitializerListElement() && | ||||
3663 | !ICS2.isStdInitializerListElement()) | ||||
3664 | return ImplicitConversionSequence::Better; | ||||
3665 | if (!ICS1.isStdInitializerListElement() && | ||||
3666 | ICS2.isStdInitializerListElement()) | ||||
3667 | return ImplicitConversionSequence::Worse; | ||||
3668 | } | ||||
3669 | |||||
3670 | if (ICS1.isStandard()) | ||||
3671 | // Standard conversion sequence S1 is a better conversion sequence than | ||||
3672 | // standard conversion sequence S2 if [...] | ||||
3673 | Result = CompareStandardConversionSequences(S, Loc, | ||||
3674 | ICS1.Standard, ICS2.Standard); | ||||
3675 | else if (ICS1.isUserDefined()) { | ||||
3676 | // User-defined conversion sequence U1 is a better conversion | ||||
3677 | // sequence than another user-defined conversion sequence U2 if | ||||
3678 | // they contain the same user-defined conversion function or | ||||
3679 | // constructor and if the second standard conversion sequence of | ||||
3680 | // U1 is better than the second standard conversion sequence of | ||||
3681 | // U2 (C++ 13.3.3.2p3). | ||||
3682 | if (ICS1.UserDefined.ConversionFunction == | ||||
3683 | ICS2.UserDefined.ConversionFunction) | ||||
3684 | Result = CompareStandardConversionSequences(S, Loc, | ||||
3685 | ICS1.UserDefined.After, | ||||
3686 | ICS2.UserDefined.After); | ||||
3687 | else | ||||
3688 | Result = compareConversionFunctions(S, | ||||
3689 | ICS1.UserDefined.ConversionFunction, | ||||
3690 | ICS2.UserDefined.ConversionFunction); | ||||
3691 | } | ||||
3692 | |||||
3693 | return Result; | ||||
3694 | } | ||||
3695 | |||||
3696 | // Per 13.3.3.2p3, compare the given standard conversion sequences to | ||||
3697 | // determine if one is a proper subset of the other. | ||||
3698 | static ImplicitConversionSequence::CompareKind | ||||
3699 | compareStandardConversionSubsets(ASTContext &Context, | ||||
3700 | const StandardConversionSequence& SCS1, | ||||
3701 | const StandardConversionSequence& SCS2) { | ||||
3702 | ImplicitConversionSequence::CompareKind Result | ||||
3703 | = ImplicitConversionSequence::Indistinguishable; | ||||
3704 | |||||
3705 | // the identity conversion sequence is considered to be a subsequence of | ||||
3706 | // any non-identity conversion sequence | ||||
3707 | if (SCS1.isIdentityConversion() && !SCS2.isIdentityConversion()) | ||||
3708 | return ImplicitConversionSequence::Better; | ||||
3709 | else if (!SCS1.isIdentityConversion() && SCS2.isIdentityConversion()) | ||||
3710 | return ImplicitConversionSequence::Worse; | ||||
3711 | |||||
3712 | if (SCS1.Second != SCS2.Second) { | ||||
3713 | if (SCS1.Second == ICK_Identity) | ||||
3714 | Result = ImplicitConversionSequence::Better; | ||||
3715 | else if (SCS2.Second == ICK_Identity) | ||||
3716 | Result = ImplicitConversionSequence::Worse; | ||||
3717 | else | ||||
3718 | return ImplicitConversionSequence::Indistinguishable; | ||||
3719 | } else if (!Context.hasSimilarType(SCS1.getToType(1), SCS2.getToType(1))) | ||||
3720 | return ImplicitConversionSequence::Indistinguishable; | ||||
3721 | |||||
3722 | if (SCS1.Third == SCS2.Third) { | ||||
3723 | return Context.hasSameType(SCS1.getToType(2), SCS2.getToType(2))? Result | ||||
3724 | : ImplicitConversionSequence::Indistinguishable; | ||||
3725 | } | ||||
3726 | |||||
3727 | if (SCS1.Third == ICK_Identity) | ||||
3728 | return Result == ImplicitConversionSequence::Worse | ||||
3729 | ? ImplicitConversionSequence::Indistinguishable | ||||
3730 | : ImplicitConversionSequence::Better; | ||||
3731 | |||||
3732 | if (SCS2.Third == ICK_Identity) | ||||
3733 | return Result == ImplicitConversionSequence::Better | ||||
3734 | ? ImplicitConversionSequence::Indistinguishable | ||||
3735 | : ImplicitConversionSequence::Worse; | ||||
3736 | |||||
3737 | return ImplicitConversionSequence::Indistinguishable; | ||||
3738 | } | ||||
3739 | |||||
3740 | /// Determine whether one of the given reference bindings is better | ||||
3741 | /// than the other based on what kind of bindings they are. | ||||
3742 | static bool | ||||
3743 | isBetterReferenceBindingKind(const StandardConversionSequence &SCS1, | ||||
3744 | const StandardConversionSequence &SCS2) { | ||||
3745 | // C++0x [over.ics.rank]p3b4: | ||||
3746 | // -- S1 and S2 are reference bindings (8.5.3) and neither refers to an | ||||
3747 | // implicit object parameter of a non-static member function declared | ||||
3748 | // without a ref-qualifier, and *either* S1 binds an rvalue reference | ||||
3749 | // to an rvalue and S2 binds an lvalue reference *or S1 binds an | ||||
3750 | // lvalue reference to a function lvalue and S2 binds an rvalue | ||||
3751 | // reference*. | ||||
3752 | // | ||||
3753 | // FIXME: Rvalue references. We're going rogue with the above edits, | ||||
3754 | // because the semantics in the current C++0x working paper (N3225 at the | ||||
3755 | // time of this writing) break the standard definition of std::forward | ||||
3756 | // and std::reference_wrapper when dealing with references to functions. | ||||
3757 | // Proposed wording changes submitted to CWG for consideration. | ||||
3758 | if (SCS1.BindsImplicitObjectArgumentWithoutRefQualifier || | ||||
3759 | SCS2.BindsImplicitObjectArgumentWithoutRefQualifier) | ||||
3760 | return false; | ||||
3761 | |||||
3762 | return (!SCS1.IsLvalueReference && SCS1.BindsToRvalue && | ||||
3763 | SCS2.IsLvalueReference) || | ||||
3764 | (SCS1.IsLvalueReference && SCS1.BindsToFunctionLvalue && | ||||
3765 | !SCS2.IsLvalueReference && SCS2.BindsToFunctionLvalue); | ||||
3766 | } | ||||
3767 | |||||
3768 | /// CompareStandardConversionSequences - Compare two standard | ||||
3769 | /// conversion sequences to determine whether one is better than the | ||||
3770 | /// other or if they are indistinguishable (C++ 13.3.3.2p3). | ||||
3771 | static ImplicitConversionSequence::CompareKind | ||||
3772 | CompareStandardConversionSequences(Sema &S, SourceLocation Loc, | ||||
3773 | const StandardConversionSequence& SCS1, | ||||
3774 | const StandardConversionSequence& SCS2) | ||||
3775 | { | ||||
3776 | // Standard conversion sequence S1 is a better conversion sequence | ||||
3777 | // than standard conversion sequence S2 if (C++ 13.3.3.2p3): | ||||
3778 | |||||
3779 | // -- S1 is a proper subsequence of S2 (comparing the conversion | ||||
3780 | // sequences in the canonical form defined by 13.3.3.1.1, | ||||
3781 | // excluding any Lvalue Transformation; the identity conversion | ||||
3782 | // sequence is considered to be a subsequence of any | ||||
3783 | // non-identity conversion sequence) or, if not that, | ||||
3784 | if (ImplicitConversionSequence::CompareKind CK | ||||
3785 | = compareStandardConversionSubsets(S.Context, SCS1, SCS2)) | ||||
3786 | return CK; | ||||
3787 | |||||
3788 | // -- the rank of S1 is better than the rank of S2 (by the rules | ||||
3789 | // defined below), or, if not that, | ||||
3790 | ImplicitConversionRank Rank1 = SCS1.getRank(); | ||||
3791 | ImplicitConversionRank Rank2 = SCS2.getRank(); | ||||
3792 | if (Rank1 < Rank2) | ||||
3793 | return ImplicitConversionSequence::Better; | ||||
3794 | else if (Rank2 < Rank1) | ||||
3795 | return ImplicitConversionSequence::Worse; | ||||
3796 | |||||
3797 | // (C++ 13.3.3.2p4): Two conversion sequences with the same rank | ||||
3798 | // are indistinguishable unless one of the following rules | ||||
3799 | // applies: | ||||
3800 | |||||
3801 | // A conversion that is not a conversion of a pointer, or | ||||
3802 | // pointer to member, to bool is better than another conversion | ||||
3803 | // that is such a conversion. | ||||
3804 | if (SCS1.isPointerConversionToBool() != SCS2.isPointerConversionToBool()) | ||||
3805 | return SCS2.isPointerConversionToBool() | ||||
3806 | ? ImplicitConversionSequence::Better | ||||
3807 | : ImplicitConversionSequence::Worse; | ||||
3808 | |||||
3809 | // C++ [over.ics.rank]p4b2: | ||||
3810 | // | ||||
3811 | // If class B is derived directly or indirectly from class A, | ||||
3812 | // conversion of B* to A* is better than conversion of B* to | ||||
3813 | // void*, and conversion of A* to void* is better than conversion | ||||
3814 | // of B* to void*. | ||||
3815 | bool SCS1ConvertsToVoid | ||||
3816 | = SCS1.isPointerConversionToVoidPointer(S.Context); | ||||
3817 | bool SCS2ConvertsToVoid | ||||
3818 | = SCS2.isPointerConversionToVoidPointer(S.Context); | ||||
3819 | if (SCS1ConvertsToVoid != SCS2ConvertsToVoid) { | ||||
3820 | // Exactly one of the conversion sequences is a conversion to | ||||
3821 | // a void pointer; it's the worse conversion. | ||||
3822 | return SCS2ConvertsToVoid ? ImplicitConversionSequence::Better | ||||
3823 | : ImplicitConversionSequence::Worse; | ||||
3824 | } else if (!SCS1ConvertsToVoid && !SCS2ConvertsToVoid) { | ||||
3825 | // Neither conversion sequence converts to a void pointer; compare | ||||
3826 | // their derived-to-base conversions. | ||||
3827 | if (ImplicitConversionSequence::CompareKind DerivedCK | ||||
3828 | = CompareDerivedToBaseConversions(S, Loc, SCS1, SCS2)) | ||||
3829 | return DerivedCK; | ||||
3830 | } else if (SCS1ConvertsToVoid && SCS2ConvertsToVoid && | ||||
3831 | !S.Context.hasSameType(SCS1.getFromType(), SCS2.getFromType())) { | ||||
3832 | // Both conversion sequences are conversions to void | ||||
3833 | // pointers. Compare the source types to determine if there's an | ||||
3834 | // inheritance relationship in their sources. | ||||
3835 | QualType FromType1 = SCS1.getFromType(); | ||||
3836 | QualType FromType2 = SCS2.getFromType(); | ||||
3837 | |||||
3838 | // Adjust the types we're converting from via the array-to-pointer | ||||
3839 | // conversion, if we need to. | ||||
3840 | if (SCS1.First == ICK_Array_To_Pointer) | ||||
3841 | FromType1 = S.Context.getArrayDecayedType(FromType1); | ||||
3842 | if (SCS2.First == ICK_Array_To_Pointer) | ||||
3843 | FromType2 = S.Context.getArrayDecayedType(FromType2); | ||||
3844 | |||||
3845 | QualType FromPointee1 = FromType1->getPointeeType().getUnqualifiedType(); | ||||
3846 | QualType FromPointee2 = FromType2->getPointeeType().getUnqualifiedType(); | ||||
3847 | |||||
3848 | if (S.IsDerivedFrom(Loc, FromPointee2, FromPointee1)) | ||||
3849 | return ImplicitConversionSequence::Better; | ||||
3850 | else if (S.IsDerivedFrom(Loc, FromPointee1, FromPointee2)) | ||||
3851 | return ImplicitConversionSequence::Worse; | ||||
3852 | |||||
3853 | // Objective-C++: If one interface is more specific than the | ||||
3854 | // other, it is the better one. | ||||
3855 | const ObjCObjectPointerType* FromObjCPtr1 | ||||
3856 | = FromType1->getAs<ObjCObjectPointerType>(); | ||||
3857 | const ObjCObjectPointerType* FromObjCPtr2 | ||||
3858 | = FromType2->getAs<ObjCObjectPointerType>(); | ||||
3859 | if (FromObjCPtr1 && FromObjCPtr2) { | ||||
3860 | bool AssignLeft = S.Context.canAssignObjCInterfaces(FromObjCPtr1, | ||||
3861 | FromObjCPtr2); | ||||
3862 | bool AssignRight = S.Context.canAssignObjCInterfaces(FromObjCPtr2, | ||||
3863 | FromObjCPtr1); | ||||
3864 | if (AssignLeft != AssignRight) { | ||||
3865 | return AssignLeft? ImplicitConversionSequence::Better | ||||
3866 | : ImplicitConversionSequence::Worse; | ||||
3867 | } | ||||
3868 | } | ||||
3869 | } | ||||
3870 | |||||
3871 | // Compare based on qualification conversions (C++ 13.3.3.2p3, | ||||
3872 | // bullet 3). | ||||
3873 | if (ImplicitConversionSequence::CompareKind QualCK | ||||
3874 | = CompareQualificationConversions(S, SCS1, SCS2)) | ||||
3875 | return QualCK; | ||||
3876 | |||||
3877 | if (SCS1.ReferenceBinding && SCS2.ReferenceBinding) { | ||||
3878 | // Check for a better reference binding based on the kind of bindings. | ||||
3879 | if (isBetterReferenceBindingKind(SCS1, SCS2)) | ||||
3880 | return ImplicitConversionSequence::Better; | ||||
3881 | else if (isBetterReferenceBindingKind(SCS2, SCS1)) | ||||
3882 | return ImplicitConversionSequence::Worse; | ||||
3883 | |||||
3884 | // C++ [over.ics.rank]p3b4: | ||||
3885 | // -- S1 and S2 are reference bindings (8.5.3), and the types to | ||||
3886 | // which the references refer are the same type except for | ||||
3887 | // top-level cv-qualifiers, and the type to which the reference | ||||
3888 | // initialized by S2 refers is more cv-qualified than the type | ||||
3889 | // to which the reference initialized by S1 refers. | ||||
3890 | QualType T1 = SCS1.getToType(2); | ||||
3891 | QualType T2 = SCS2.getToType(2); | ||||
3892 | T1 = S.Context.getCanonicalType(T1); | ||||
3893 | T2 = S.Context.getCanonicalType(T2); | ||||
3894 | Qualifiers T1Quals, T2Quals; | ||||
3895 | QualType UnqualT1 = S.Context.getUnqualifiedArrayType(T1, T1Quals); | ||||
3896 | QualType UnqualT2 = S.Context.getUnqualifiedArrayType(T2, T2Quals); | ||||
3897 | if (UnqualT1 == UnqualT2) { | ||||
3898 | // Objective-C++ ARC: If the references refer to objects with different | ||||
3899 | // lifetimes, prefer bindings that don't change lifetime. | ||||
3900 | if (SCS1.ObjCLifetimeConversionBinding != | ||||
3901 | SCS2.ObjCLifetimeConversionBinding) { | ||||
3902 | return SCS1.ObjCLifetimeConversionBinding | ||||
3903 | ? ImplicitConversionSequence::Worse | ||||
3904 | : ImplicitConversionSequence::Better; | ||||
3905 | } | ||||
3906 | |||||
3907 | // If the type is an array type, promote the element qualifiers to the | ||||
3908 | // type for comparison. | ||||
3909 | if (isa<ArrayType>(T1) && T1Quals) | ||||
3910 | T1 = S.Context.getQualifiedType(UnqualT1, T1Quals); | ||||
3911 | if (isa<ArrayType>(T2) && T2Quals) | ||||
3912 | T2 = S.Context.getQualifiedType(UnqualT2, T2Quals); | ||||
3913 | if (T2.isMoreQualifiedThan(T1)) | ||||
3914 | return ImplicitConversionSequence::Better; | ||||
3915 | else if (T1.isMoreQualifiedThan(T2)) | ||||
3916 | return ImplicitConversionSequence::Worse; | ||||
3917 | } | ||||
3918 | } | ||||
3919 | |||||
3920 | // In Microsoft mode, prefer an integral conversion to a | ||||
3921 | // floating-to-integral conversion if the integral conversion | ||||
3922 | // is between types of the same size. | ||||
3923 | // For example: | ||||
3924 | // void f(float); | ||||
3925 | // void f(int); | ||||
3926 | // int main { | ||||
3927 | // long a; | ||||
3928 | // f(a); | ||||
3929 | // } | ||||
3930 | // Here, MSVC will call f(int) instead of generating a compile error | ||||
3931 | // as clang will do in standard mode. | ||||
3932 | if (S.getLangOpts().MSVCCompat && SCS1.Second == ICK_Integral_Conversion && | ||||
3933 | SCS2.Second == ICK_Floating_Integral && | ||||
3934 | S.Context.getTypeSize(SCS1.getFromType()) == | ||||
3935 | S.Context.getTypeSize(SCS1.getToType(2))) | ||||
3936 | return ImplicitConversionSequence::Better; | ||||
3937 | |||||
3938 | // Prefer a compatible vector conversion over a lax vector conversion | ||||
3939 | // For example: | ||||
3940 | // | ||||
3941 | // typedef float __v4sf __attribute__((__vector_size__(16))); | ||||
3942 | // void f(vector float); | ||||
3943 | // void f(vector signed int); | ||||
3944 | // int main() { | ||||
3945 | // __v4sf a; | ||||
3946 | // f(a); | ||||
3947 | // } | ||||
3948 | // Here, we'd like to choose f(vector float) and not | ||||
3949 | // report an ambiguous call error | ||||
3950 | if (SCS1.Second == ICK_Vector_Conversion && | ||||
3951 | SCS2.Second == ICK_Vector_Conversion) { | ||||
3952 | bool SCS1IsCompatibleVectorConversion = S.Context.areCompatibleVectorTypes( | ||||
3953 | SCS1.getFromType(), SCS1.getToType(2)); | ||||
3954 | bool SCS2IsCompatibleVectorConversion = S.Context.areCompatibleVectorTypes( | ||||
3955 | SCS2.getFromType(), SCS2.getToType(2)); | ||||
3956 | |||||
3957 | if (SCS1IsCompatibleVectorConversion != SCS2IsCompatibleVectorConversion) | ||||
3958 | return SCS1IsCompatibleVectorConversion | ||||
3959 | ? ImplicitConversionSequence::Better | ||||
3960 | : ImplicitConversionSequence::Worse; | ||||
3961 | } | ||||
3962 | |||||
3963 | return ImplicitConversionSequence::Indistinguishable; | ||||
3964 | } | ||||
3965 | |||||
3966 | /// CompareQualificationConversions - Compares two standard conversion | ||||
3967 | /// sequences to determine whether they can be ranked based on their | ||||
3968 | /// qualification conversions (C++ 13.3.3.2p3 bullet 3). | ||||
3969 | static ImplicitConversionSequence::CompareKind | ||||
3970 | CompareQualificationConversions(Sema &S, | ||||
3971 | const StandardConversionSequence& SCS1, | ||||
3972 | const StandardConversionSequence& SCS2) { | ||||
3973 | // C++ 13.3.3.2p3: | ||||
3974 | // -- S1 and S2 differ only in their qualification conversion and | ||||
3975 | // yield similar types T1 and T2 (C++ 4.4), respectively, and the | ||||
3976 | // cv-qualification signature of type T1 is a proper subset of | ||||
3977 | // the cv-qualification signature of type T2, and S1 is not the | ||||
3978 | // deprecated string literal array-to-pointer conversion (4.2). | ||||
3979 | if (SCS1.First != SCS2.First || SCS1.Second != SCS2.Second || | ||||
3980 | SCS1.Third != SCS2.Third || SCS1.Third != ICK_Qualification) | ||||
3981 | return ImplicitConversionSequence::Indistinguishable; | ||||
3982 | |||||
3983 | // FIXME: the example in the standard doesn't use a qualification | ||||
3984 | // conversion (!) | ||||
3985 | QualType T1 = SCS1.getToType(2); | ||||
3986 | QualType T2 = SCS2.getToType(2); | ||||
3987 | T1 = S.Context.getCanonicalType(T1); | ||||
3988 | T2 = S.Context.getCanonicalType(T2); | ||||
3989 | Qualifiers T1Quals, T2Quals; | ||||
3990 | QualType UnqualT1 = S.Context.getUnqualifiedArrayType(T1, T1Quals); | ||||
3991 | QualType UnqualT2 = S.Context.getUnqualifiedArrayType(T2, T2Quals); | ||||
3992 | |||||
3993 | // If the types are the same, we won't learn anything by unwrapped | ||||
3994 | // them. | ||||
3995 | if (UnqualT1 == UnqualT2) | ||||
3996 | return ImplicitConversionSequence::Indistinguishable; | ||||
3997 | |||||
3998 | // If the type is an array type, promote the element qualifiers to the type | ||||
3999 | // for comparison. | ||||
4000 | if (isa<ArrayType>(T1) && T1Quals) | ||||
4001 | T1 = S.Context.getQualifiedType(UnqualT1, T1Quals); | ||||
4002 | if (isa<ArrayType>(T2) && T2Quals) | ||||
4003 | T2 = S.Context.getQualifiedType(UnqualT2, T2Quals); | ||||
4004 | |||||
4005 | ImplicitConversionSequence::CompareKind Result | ||||
4006 | = ImplicitConversionSequence::Indistinguishable; | ||||
4007 | |||||
4008 | // Objective-C++ ARC: | ||||
4009 | // Prefer qualification conversions not involving a change in lifetime | ||||
4010 | // to qualification conversions that do not change lifetime. | ||||
4011 | if (SCS1.QualificationIncludesObjCLifetime != | ||||
4012 | SCS2.QualificationIncludesObjCLifetime) { | ||||
4013 | Result = SCS1.QualificationIncludesObjCLifetime | ||||
4014 | ? ImplicitConversionSequence::Worse | ||||
4015 | : ImplicitConversionSequence::Better; | ||||
4016 | } | ||||
4017 | |||||
4018 | while (S.Context.UnwrapSimilarTypes(T1, T2)) { | ||||
4019 | // Within each iteration of the loop, we check the qualifiers to | ||||
4020 | // determine if this still looks like a qualification | ||||
4021 | // conversion. Then, if all is well, we unwrap one more level of | ||||
4022 | // pointers or pointers-to-members and do it all again | ||||
4023 | // until there are no more pointers or pointers-to-members left | ||||
4024 | // to unwrap. This essentially mimics what | ||||
4025 | // IsQualificationConversion does, but here we're checking for a | ||||
4026 | // strict subset of qualifiers. | ||||
4027 | if (T1.getQualifiers().withoutObjCLifetime() == | ||||
4028 | T2.getQualifiers().withoutObjCLifetime()) | ||||
4029 | // The qualifiers are the same, so this doesn't tell us anything | ||||
4030 | // about how the sequences rank. | ||||
4031 | // ObjC ownership quals are omitted above as they interfere with | ||||
4032 | // the ARC overload rule. | ||||
4033 | ; | ||||
4034 | else if (T2.isMoreQualifiedThan(T1)) { | ||||
4035 | // T1 has fewer qualifiers, so it could be the better sequence. | ||||
4036 | if (Result == ImplicitConversionSequence::Worse) | ||||
4037 | // Neither has qualifiers that are a subset of the other's | ||||
4038 | // qualifiers. | ||||
4039 | return ImplicitConversionSequence::Indistinguishable; | ||||
4040 | |||||
4041 | Result = ImplicitConversionSequence::Better; | ||||
4042 | } else if (T1.isMoreQualifiedThan(T2)) { | ||||
4043 | // T2 has fewer qualifiers, so it could be the better sequence. | ||||
4044 | if (Result == ImplicitConversionSequence::Better) | ||||
4045 | // Neither has qualifiers that are a subset of the other's | ||||
4046 | // qualifiers. | ||||
4047 | return ImplicitConversionSequence::Indistinguishable; | ||||
4048 | |||||
4049 | Result = ImplicitConversionSequence::Worse; | ||||
4050 | } else { | ||||
4051 | // Qualifiers are disjoint. | ||||
4052 | return ImplicitConversionSequence::Indistinguishable; | ||||
4053 | } | ||||
4054 | |||||
4055 | // If the types after this point are equivalent, we're done. | ||||
4056 | if (S.Context.hasSameUnqualifiedType(T1, T2)) | ||||
4057 | break; | ||||
4058 | } | ||||
4059 | |||||
4060 | // Check that the winning standard conversion sequence isn't using | ||||
4061 | // the deprecated string literal array to pointer conversion. | ||||
4062 | switch (Result) { | ||||
4063 | case ImplicitConversionSequence::Better: | ||||
4064 | if (SCS1.DeprecatedStringLiteralToCharPtr) | ||||
4065 | Result = ImplicitConversionSequence::Indistinguishable; | ||||
4066 | break; | ||||
4067 | |||||
4068 | case ImplicitConversionSequence::Indistinguishable: | ||||
4069 | break; | ||||
4070 | |||||
4071 | case ImplicitConversionSequence::Worse: | ||||
4072 | if (SCS2.DeprecatedStringLiteralToCharPtr) | ||||
4073 | Result = ImplicitConversionSequence::Indistinguishable; | ||||
4074 | break; | ||||
4075 | } | ||||
4076 | |||||
4077 | return Result; | ||||
4078 | } | ||||
4079 | |||||
4080 | /// CompareDerivedToBaseConversions - Compares two standard conversion | ||||
4081 | /// sequences to determine whether they can be ranked based on their | ||||
4082 | /// various kinds of derived-to-base conversions (C++ | ||||
4083 | /// [over.ics.rank]p4b3). As part of these checks, we also look at | ||||
4084 | /// conversions between Objective-C interface types. | ||||
4085 | static ImplicitConversionSequence::CompareKind | ||||
4086 | CompareDerivedToBaseConversions(Sema &S, SourceLocation Loc, | ||||
4087 | const StandardConversionSequence& SCS1, | ||||
4088 | const StandardConversionSequence& SCS2) { | ||||
4089 | QualType FromType1 = SCS1.getFromType(); | ||||
4090 | QualType ToType1 = SCS1.getToType(1); | ||||
4091 | QualType FromType2 = SCS2.getFromType(); | ||||
4092 | QualType ToType2 = SCS2.getToType(1); | ||||
4093 | |||||
4094 | // Adjust the types we're converting from via the array-to-pointer | ||||
4095 | // conversion, if we need to. | ||||
4096 | if (SCS1.First == ICK_Array_To_Pointer) | ||||
4097 | FromType1 = S.Context.getArrayDecayedType(FromType1); | ||||
4098 | if (SCS2.First == ICK_Array_To_Pointer) | ||||
4099 | FromType2 = S.Context.getArrayDecayedType(FromType2); | ||||
4100 | |||||
4101 | // Canonicalize all of the types. | ||||
4102 | FromType1 = S.Context.getCanonicalType(FromType1); | ||||
4103 | ToType1 = S.Context.getCanonicalType(ToType1); | ||||
4104 | FromType2 = S.Context.getCanonicalType(FromType2); | ||||
4105 | ToType2 = S.Context.getCanonicalType(ToType2); | ||||
4106 | |||||
4107 | // C++ [over.ics.rank]p4b3: | ||||
4108 | // | ||||
4109 | // If class B is derived directly or indirectly from class A and | ||||
4110 | // class C is derived directly or indirectly from B, | ||||
4111 | // | ||||
4112 | // Compare based on pointer conversions. | ||||
4113 | if (SCS1.Second == ICK_Pointer_Conversion && | ||||
4114 | SCS2.Second == ICK_Pointer_Conversion && | ||||
4115 | /*FIXME: Remove if Objective-C id conversions get their own rank*/ | ||||
4116 | FromType1->isPointerType() && FromType2->isPointerType() && | ||||
4117 | ToType1->isPointerType() && ToType2->isPointerType()) { | ||||
4118 | QualType FromPointee1 = | ||||
4119 | FromType1->castAs<PointerType>()->getPointeeType().getUnqualifiedType(); | ||||
4120 | QualType ToPointee1 = | ||||
4121 | ToType1->castAs<PointerType>()->getPointeeType().getUnqualifiedType(); | ||||
4122 | QualType FromPointee2 = | ||||
4123 | FromType2->castAs<PointerType>()->getPointeeType().getUnqualifiedType(); | ||||
4124 | QualType ToPointee2 = | ||||
4125 | ToType2->castAs<PointerType>()->getPointeeType().getUnqualifiedType(); | ||||
4126 | |||||
4127 | // -- conversion of C* to B* is better than conversion of C* to A*, | ||||
4128 | if (FromPointee1 == FromPointee2 && ToPointee1 != ToPointee2) { | ||||
4129 | if (S.IsDerivedFrom(Loc, ToPointee1, ToPointee2)) | ||||
4130 | return ImplicitConversionSequence::Better; | ||||
4131 | else if (S.IsDerivedFrom(Loc, ToPointee2, ToPointee1)) | ||||
4132 | return ImplicitConversionSequence::Worse; | ||||
4133 | } | ||||
4134 | |||||
4135 | // -- conversion of B* to A* is better than conversion of C* to A*, | ||||
4136 | if (FromPointee1 != FromPointee2 && ToPointee1 == ToPointee2) { | ||||
4137 | if (S.IsDerivedFrom(Loc, FromPointee2, FromPointee1)) | ||||
4138 | return ImplicitConversionSequence::Better; | ||||
4139 | else if (S.IsDerivedFrom(Loc, FromPointee1, FromPointee2)) | ||||
4140 | return ImplicitConversionSequence::Worse; | ||||
4141 | } | ||||
4142 | } else if (SCS1.Second == ICK_Pointer_Conversion && | ||||
4143 | SCS2.Second == ICK_Pointer_Conversion) { | ||||
4144 | const ObjCObjectPointerType *FromPtr1 | ||||
4145 | = FromType1->getAs<ObjCObjectPointerType>(); | ||||
4146 | const ObjCObjectPointerType *FromPtr2 | ||||
4147 | = FromType2->getAs<ObjCObjectPointerType>(); | ||||
4148 | const ObjCObjectPointerType *ToPtr1 | ||||
4149 | = ToType1->getAs<ObjCObjectPointerType>(); | ||||
4150 | const ObjCObjectPointerType *ToPtr2 | ||||
4151 | = ToType2->getAs<ObjCObjectPointerType>(); | ||||
4152 | |||||
4153 | if (FromPtr1 && FromPtr2 && ToPtr1 && ToPtr2) { | ||||
4154 | // Apply the same conversion ranking rules for Objective-C pointer types | ||||
4155 | // that we do for C++ pointers to class types. However, we employ the | ||||
4156 | // Objective-C pseudo-subtyping relationship used for assignment of | ||||
4157 | // Objective-C pointer types. | ||||
4158 | bool FromAssignLeft | ||||
4159 | = S.Context.canAssignObjCInterfaces(FromPtr1, FromPtr2); | ||||
4160 | bool FromAssignRight | ||||
4161 | = S.Context.canAssignObjCInterfaces(FromPtr2, FromPtr1); | ||||
4162 | bool ToAssignLeft | ||||
4163 | = S.Context.canAssignObjCInterfaces(ToPtr1, ToPtr2); | ||||
4164 | bool ToAssignRight | ||||
4165 | = S.Context.canAssignObjCInterfaces(ToPtr2, ToPtr1); | ||||
4166 | |||||
4167 | // A conversion to an a non-id object pointer type or qualified 'id' | ||||
4168 | // type is better than a conversion to 'id'. | ||||
4169 | if (ToPtr1->isObjCIdType() && | ||||
4170 | (ToPtr2->isObjCQualifiedIdType() || ToPtr2->getInterfaceDecl())) | ||||
4171 | return ImplicitConversionSequence::Worse; | ||||
4172 | if (ToPtr2->isObjCIdType() && | ||||
4173 | (ToPtr1->isObjCQualifiedIdType() || ToPtr1->getInterfaceDecl())) | ||||
4174 | return ImplicitConversionSequence::Better; | ||||
4175 | |||||
4176 | // A conversion to a non-id object pointer type is better than a | ||||
4177 | // conversion to a qualified 'id' type | ||||
4178 | if (ToPtr1->isObjCQualifiedIdType() && ToPtr2->getInterfaceDecl()) | ||||
4179 | return ImplicitConversionSequence::Worse; | ||||
4180 | if (ToPtr2->isObjCQualifiedIdType() && ToPtr1->getInterfaceDecl()) | ||||
4181 | return ImplicitConversionSequence::Better; | ||||
4182 | |||||
4183 | // A conversion to an a non-Class object pointer type or qualified 'Class' | ||||
4184 | // type is better than a conversion to 'Class'. | ||||
4185 | if (ToPtr1->isObjCClassType() && | ||||
4186 | (ToPtr2->isObjCQualifiedClassType() || ToPtr2->getInterfaceDecl())) | ||||
4187 | return ImplicitConversionSequence::Worse; | ||||
4188 | if (ToPtr2->isObjCClassType() && | ||||
4189 | (ToPtr1->isObjCQualifiedClassType() || ToPtr1->getInterfaceDecl())) | ||||
4190 | return ImplicitConversionSequence::Better; | ||||
4191 | |||||
4192 | // A conversion to a non-Class object pointer type is better than a | ||||
4193 | // conversion to a qualified 'Class' type. | ||||
4194 | if (ToPtr1->isObjCQualifiedClassType() && ToPtr2->getInterfaceDecl()) | ||||
4195 | return ImplicitConversionSequence::Worse; | ||||
4196 | if (ToPtr2->isObjCQualifiedClassType() && ToPtr1->getInterfaceDecl()) | ||||
4197 | return ImplicitConversionSequence::Better; | ||||
4198 | |||||
4199 | // -- "conversion of C* to B* is better than conversion of C* to A*," | ||||
4200 | if (S.Context.hasSameType(FromType1, FromType2) && | ||||
4201 | !FromPtr1->isObjCIdType() && !FromPtr1->isObjCClassType() && | ||||
4202 | (ToAssignLeft != ToAssignRight)) { | ||||
4203 | if (FromPtr1->isSpecialized()) { | ||||
4204 | // "conversion of B<A> * to B * is better than conversion of B * to | ||||
4205 | // C *. | ||||
4206 | bool IsFirstSame = | ||||
4207 | FromPtr1->getInterfaceDecl() == ToPtr1->getInterfaceDecl(); | ||||
4208 | bool IsSecondSame = | ||||
4209 | FromPtr1->getInterfaceDecl() == ToPtr2->getInterfaceDecl(); | ||||
4210 | if (IsFirstSame) { | ||||
4211 | if (!IsSecondSame) | ||||
4212 | return ImplicitConversionSequence::Better; | ||||
4213 | } else if (IsSecondSame) | ||||
4214 | return ImplicitConversionSequence::Worse; | ||||
4215 | } | ||||
4216 | return ToAssignLeft? ImplicitConversionSequence::Worse | ||||
4217 | : ImplicitConversionSequence::Better; | ||||
4218 | } | ||||
4219 | |||||
4220 | // -- "conversion of B* to A* is better than conversion of C* to A*," | ||||
4221 | if (S.Context.hasSameUnqualifiedType(ToType1, ToType2) && | ||||
4222 | (FromAssignLeft != FromAssignRight)) | ||||
4223 | return FromAssignLeft? ImplicitConversionSequence::Better | ||||
4224 | : ImplicitConversionSequence::Worse; | ||||
4225 | } | ||||
4226 | } | ||||
4227 | |||||
4228 | // Ranking of member-pointer types. | ||||
4229 | if (SCS1.Second == ICK_Pointer_Member && SCS2.Second == ICK_Pointer_Member && | ||||
4230 | FromType1->isMemberPointerType() && FromType2->isMemberPointerType() && | ||||
4231 | ToType1->isMemberPointerType() && ToType2->isMemberPointerType()) { | ||||
4232 | const MemberPointerType * FromMemPointer1 = | ||||
4233 | FromType1->getAs<MemberPointerType>(); | ||||
4234 | const MemberPointerType * ToMemPointer1 = | ||||
4235 | ToType1->getAs<MemberPointerType>(); | ||||
4236 | const MemberPointerType * FromMemPointer2 = | ||||
4237 | FromType2->getAs<MemberPointerType>(); | ||||
4238 | const MemberPointerType * ToMemPointer2 = | ||||
4239 | ToType2->getAs<MemberPointerType>(); | ||||
4240 | const Type *FromPointeeType1 = FromMemPointer1->getClass(); | ||||
4241 | const Type *ToPointeeType1 = ToMemPointer1->getClass(); | ||||
4242 | const Type *FromPointeeType2 = FromMemPointer2->getClass(); | ||||
4243 | const Type *ToPointeeType2 = ToMemPointer2->getClass(); | ||||
4244 | QualType FromPointee1 = QualType(FromPointeeType1, 0).getUnqualifiedType(); | ||||
4245 | QualType ToPointee1 = QualType(ToPointeeType1, 0).getUnqualifiedType(); | ||||
4246 | QualType FromPointee2 = QualType(FromPointeeType2, 0).getUnqualifiedType(); | ||||
4247 | QualType ToPointee2 = QualType(ToPointeeType2, 0).getUnqualifiedType(); | ||||
4248 | // conversion of A::* to B::* is better than conversion of A::* to C::*, | ||||
4249 | if (FromPointee1 == FromPointee2 && ToPointee1 != ToPointee2) { | ||||
4250 | if (S.IsDerivedFrom(Loc, ToPointee1, ToPointee2)) | ||||
4251 | return ImplicitConversionSequence::Worse; | ||||
4252 | else if (S.IsDerivedFrom(Loc, ToPointee2, ToPointee1)) | ||||
4253 | return ImplicitConversionSequence::Better; | ||||
4254 | } | ||||
4255 | // conversion of B::* to C::* is better than conversion of A::* to C::* | ||||
4256 | if (ToPointee1 == ToPointee2 && FromPointee1 != FromPointee2) { | ||||
4257 | if (S.IsDerivedFrom(Loc, FromPointee1, FromPointee2)) | ||||
4258 | return ImplicitConversionSequence::Better; | ||||
4259 | else if (S.IsDerivedFrom(Loc, FromPointee2, FromPointee1)) | ||||
4260 | return ImplicitConversionSequence::Worse; | ||||
4261 | } | ||||
4262 | } | ||||
4263 | |||||
4264 | if (SCS1.Second == ICK_Derived_To_Base) { | ||||
4265 | // -- conversion of C to B is better than conversion of C to A, | ||||
4266 | // -- binding of an expression of type C to a reference of type | ||||
4267 | // B& is better than binding an expression of type C to a | ||||
4268 | // reference of type A&, | ||||
4269 | if (S.Context.hasSameUnqualifiedType(FromType1, FromType2) && | ||||
4270 | !S.Context.hasSameUnqualifiedType(ToType1, ToType2)) { | ||||
4271 | if (S.IsDerivedFrom(Loc, ToType1, ToType2)) | ||||
4272 | return ImplicitConversionSequence::Better; | ||||
4273 | else if (S.IsDerivedFrom(Loc, ToType2, ToType1)) | ||||
4274 | return ImplicitConversionSequence::Worse; | ||||
4275 | } | ||||
4276 | |||||
4277 | // -- conversion of B to A is better than conversion of C to A. | ||||
4278 | // -- binding of an expression of type B to a reference of type | ||||
4279 | // A& is better than binding an expression of type C to a | ||||
4280 | // reference of type A&, | ||||
4281 | if (!S.Context.hasSameUnqualifiedType(FromType1, FromType2) && | ||||
4282 | S.Context.hasSameUnqualifiedType(ToType1, ToType2)) { | ||||
4283 | if (S.IsDerivedFrom(Loc, FromType2, FromType1)) | ||||
4284 | return ImplicitConversionSequence::Better; | ||||
4285 | else if (S.IsDerivedFrom(Loc, FromType1, FromType2)) | ||||
4286 | return ImplicitConversionSequence::Worse; | ||||
4287 | } | ||||
4288 | } | ||||
4289 | |||||
4290 | return ImplicitConversionSequence::Indistinguishable; | ||||
4291 | } | ||||
4292 | |||||
4293 | /// Determine whether the given type is valid, e.g., it is not an invalid | ||||
4294 | /// C++ class. | ||||
4295 | static bool isTypeValid(QualType T) { | ||||
4296 | if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) | ||||
4297 | return !Record->isInvalidDecl(); | ||||
4298 | |||||
4299 | return true; | ||||
4300 | } | ||||
4301 | |||||
4302 | /// CompareReferenceRelationship - Compare the two types T1 and T2 to | ||||
4303 | /// determine whether they are reference-related, | ||||
4304 | /// reference-compatible, reference-compatible with added | ||||
4305 | /// qualification, or incompatible, for use in C++ initialization by | ||||
4306 | /// reference (C++ [dcl.ref.init]p4). Neither type can be a reference | ||||
4307 | /// type, and the first type (T1) is the pointee type of the reference | ||||
4308 | /// type being initialized. | ||||
4309 | Sema::ReferenceCompareResult | ||||
4310 | Sema::CompareReferenceRelationship(SourceLocation Loc, | ||||
4311 | QualType OrigT1, QualType OrigT2, | ||||
4312 | bool &DerivedToBase, | ||||
4313 | bool &ObjCConversion, | ||||
4314 | bool &ObjCLifetimeConversion) { | ||||
4315 | assert(!OrigT1->isReferenceType() &&((!OrigT1->isReferenceType() && "T1 must be the pointee type of the reference type" ) ? static_cast<void> (0) : __assert_fail ("!OrigT1->isReferenceType() && \"T1 must be the pointee type of the reference type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 4316, __PRETTY_FUNCTION__)) | ||||
4316 | "T1 must be the pointee type of the reference type")((!OrigT1->isReferenceType() && "T1 must be the pointee type of the reference type" ) ? static_cast<void> (0) : __assert_fail ("!OrigT1->isReferenceType() && \"T1 must be the pointee type of the reference type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 4316, __PRETTY_FUNCTION__)); | ||||
4317 | assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type")((!OrigT2->isReferenceType() && "T2 cannot be a reference type" ) ? static_cast<void> (0) : __assert_fail ("!OrigT2->isReferenceType() && \"T2 cannot be a reference type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 4317, __PRETTY_FUNCTION__)); | ||||
4318 | |||||
4319 | QualType T1 = Context.getCanonicalType(OrigT1); | ||||
4320 | QualType T2 = Context.getCanonicalType(OrigT2); | ||||
4321 | Qualifiers T1Quals, T2Quals; | ||||
4322 | QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); | ||||
4323 | QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); | ||||
4324 | |||||
4325 | // C++ [dcl.init.ref]p4: | ||||
4326 | // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is | ||||
4327 | // reference-related to "cv2 T2" if T1 is the same type as T2, or | ||||
4328 | // T1 is a base class of T2. | ||||
4329 | DerivedToBase = false; | ||||
4330 | ObjCConversion = false; | ||||
4331 | ObjCLifetimeConversion = false; | ||||
4332 | QualType ConvertedT2; | ||||
4333 | if (UnqualT1 == UnqualT2) { | ||||
4334 | // Nothing to do. | ||||
4335 | } else if (isCompleteType(Loc, OrigT2) && | ||||
4336 | isTypeValid(UnqualT1) && isTypeValid(UnqualT2) && | ||||
4337 | IsDerivedFrom(Loc, UnqualT2, UnqualT1)) | ||||
4338 | DerivedToBase = true; | ||||
4339 | else if (UnqualT1->isObjCObjectOrInterfaceType() && | ||||
4340 | UnqualT2->isObjCObjectOrInterfaceType() && | ||||
4341 | Context.canBindObjCObjectType(UnqualT1, UnqualT2)) | ||||
4342 | ObjCConversion = true; | ||||
4343 | else if (UnqualT2->isFunctionType() && | ||||
4344 | IsFunctionConversion(UnqualT2, UnqualT1, ConvertedT2)) | ||||
4345 | // C++1z [dcl.init.ref]p4: | ||||
4346 | // cv1 T1" is reference-compatible with "cv2 T2" if [...] T2 is "noexcept | ||||
4347 | // function" and T1 is "function" | ||||
4348 | // | ||||
4349 | // We extend this to also apply to 'noreturn', so allow any function | ||||
4350 | // conversion between function types. | ||||
4351 | return Ref_Compatible; | ||||
4352 | else | ||||
4353 | return Ref_Incompatible; | ||||
4354 | |||||
4355 | // At this point, we know that T1 and T2 are reference-related (at | ||||
4356 | // least). | ||||
4357 | |||||
4358 | // If the type is an array type, promote the element qualifiers to the type | ||||
4359 | // for comparison. | ||||
4360 | if (isa<ArrayType>(T1) && T1Quals) | ||||
4361 | T1 = Context.getQualifiedType(UnqualT1, T1Quals); | ||||
4362 | if (isa<ArrayType>(T2) && T2Quals) | ||||
4363 | T2 = Context.getQualifiedType(UnqualT2, T2Quals); | ||||
4364 | |||||
4365 | // C++ [dcl.init.ref]p4: | ||||
4366 | // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is | ||||
4367 | // reference-related to T2 and cv1 is the same cv-qualification | ||||
4368 | // as, or greater cv-qualification than, cv2. For purposes of | ||||
4369 | // overload resolution, cases for which cv1 is greater | ||||
4370 | // cv-qualification than cv2 are identified as | ||||
4371 | // reference-compatible with added qualification (see 13.3.3.2). | ||||
4372 | // | ||||
4373 | // Note that we also require equivalence of Objective-C GC and address-space | ||||
4374 | // qualifiers when performing these computations, so that e.g., an int in | ||||
4375 | // address space 1 is not reference-compatible with an int in address | ||||
4376 | // space 2. | ||||
4377 | if (T1Quals.getObjCLifetime() != T2Quals.getObjCLifetime() && | ||||
4378 | T1Quals.compatiblyIncludesObjCLifetime(T2Quals)) { | ||||
4379 | if (isNonTrivialObjCLifetimeConversion(T2Quals, T1Quals)) | ||||
4380 | ObjCLifetimeConversion = true; | ||||
4381 | |||||
4382 | T1Quals.removeObjCLifetime(); | ||||
4383 | T2Quals.removeObjCLifetime(); | ||||
4384 | } | ||||
4385 | |||||
4386 | // MS compiler ignores __unaligned qualifier for references; do the same. | ||||
4387 | T1Quals.removeUnaligned(); | ||||
4388 | T2Quals.removeUnaligned(); | ||||
4389 | |||||
4390 | if (T1Quals.compatiblyIncludes(T2Quals)) | ||||
4391 | return Ref_Compatible; | ||||
4392 | else | ||||
4393 | return Ref_Related; | ||||
4394 | } | ||||
4395 | |||||
4396 | /// Look for a user-defined conversion to a value reference-compatible | ||||
4397 | /// with DeclType. Return true if something definite is found. | ||||
4398 | static bool | ||||
4399 | FindConversionForRefInit(Sema &S, ImplicitConversionSequence &ICS, | ||||
4400 | QualType DeclType, SourceLocation DeclLoc, | ||||
4401 | Expr *Init, QualType T2, bool AllowRvalues, | ||||
4402 | bool AllowExplicit) { | ||||
4403 | assert(T2->isRecordType() && "Can only find conversions of record types.")((T2->isRecordType() && "Can only find conversions of record types." ) ? static_cast<void> (0) : __assert_fail ("T2->isRecordType() && \"Can only find conversions of record types.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 4403, __PRETTY_FUNCTION__)); | ||||
4404 | CXXRecordDecl *T2RecordDecl | ||||
4405 | = dyn_cast<CXXRecordDecl>(T2->castAs<RecordType>()->getDecl()); | ||||
4406 | |||||
4407 | OverloadCandidateSet CandidateSet( | ||||
4408 | DeclLoc, OverloadCandidateSet::CSK_InitByUserDefinedConversion); | ||||
4409 | const auto &Conversions = T2RecordDecl->getVisibleConversionFunctions(); | ||||
4410 | for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) { | ||||
4411 | NamedDecl *D = *I; | ||||
4412 | CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); | ||||
4413 | if (isa<UsingShadowDecl>(D)) | ||||
4414 | D = cast<UsingShadowDecl>(D)->getTargetDecl(); | ||||
4415 | |||||
4416 | FunctionTemplateDecl *ConvTemplate | ||||
4417 | = dyn_cast<FunctionTemplateDecl>(D); | ||||
4418 | CXXConversionDecl *Conv; | ||||
4419 | if (ConvTemplate) | ||||
4420 | Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); | ||||
4421 | else | ||||
4422 | Conv = cast<CXXConversionDecl>(D); | ||||
4423 | |||||
4424 | // If this is an explicit conversion, and we're not allowed to consider | ||||
4425 | // explicit conversions, skip it. | ||||
4426 | if (!AllowExplicit && Conv->isExplicit()) | ||||
4427 | continue; | ||||
4428 | |||||
4429 | if (AllowRvalues) { | ||||
4430 | bool DerivedToBase = false; | ||||
4431 | bool ObjCConversion = false; | ||||
4432 | bool ObjCLifetimeConversion = false; | ||||
4433 | |||||
4434 | // If we are initializing an rvalue reference, don't permit conversion | ||||
4435 | // functions that return lvalues. | ||||
4436 | if (!ConvTemplate && DeclType->isRValueReferenceType()) { | ||||
4437 | const ReferenceType *RefType | ||||
4438 | = Conv->getConversionType()->getAs<LValueReferenceType>(); | ||||
4439 | if (RefType && !RefType->getPointeeType()->isFunctionType()) | ||||
4440 | continue; | ||||
4441 | } | ||||
4442 | |||||
4443 | if (!ConvTemplate && | ||||
4444 | S.CompareReferenceRelationship( | ||||
4445 | DeclLoc, | ||||
4446 | Conv->getConversionType().getNonReferenceType() | ||||
4447 | .getUnqualifiedType(), | ||||
4448 | DeclType.getNonReferenceType().getUnqualifiedType(), | ||||
4449 | DerivedToBase, ObjCConversion, ObjCLifetimeConversion) == | ||||
4450 | Sema::Ref_Incompatible) | ||||
4451 | continue; | ||||
4452 | } else { | ||||
4453 | // If the conversion function doesn't return a reference type, | ||||
4454 | // it can't be considered for this conversion. An rvalue reference | ||||
4455 | // is only acceptable if its referencee is a function type. | ||||
4456 | |||||
4457 | const ReferenceType *RefType = | ||||
4458 | Conv->getConversionType()->getAs<ReferenceType>(); | ||||
4459 | if (!RefType || | ||||
4460 | (!RefType->isLValueReferenceType() && | ||||
4461 | !RefType->getPointeeType()->isFunctionType())) | ||||
4462 | continue; | ||||
4463 | } | ||||
4464 | |||||
4465 | if (ConvTemplate) | ||||
4466 | S.AddTemplateConversionCandidate( | ||||
4467 | ConvTemplate, I.getPair(), ActingDC, Init, DeclType, CandidateSet, | ||||
4468 | /*AllowObjCConversionOnExplicit=*/false, AllowExplicit); | ||||
4469 | else | ||||
4470 | S.AddConversionCandidate( | ||||
4471 | Conv, I.getPair(), ActingDC, Init, DeclType, CandidateSet, | ||||
4472 | /*AllowObjCConversionOnExplicit=*/false, AllowExplicit); | ||||
4473 | } | ||||
4474 | |||||
4475 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | ||||
4476 | |||||
4477 | OverloadCandidateSet::iterator Best; | ||||
4478 | switch (CandidateSet.BestViableFunction(S, DeclLoc, Best)) { | ||||
4479 | case OR_Success: | ||||
4480 | // C++ [over.ics.ref]p1: | ||||
4481 | // | ||||
4482 | // [...] If the parameter binds directly to the result of | ||||
4483 | // applying a conversion function to the argument | ||||
4484 | // expression, the implicit conversion sequence is a | ||||
4485 | // user-defined conversion sequence (13.3.3.1.2), with the | ||||
4486 | // second standard conversion sequence either an identity | ||||
4487 | // conversion or, if the conversion function returns an | ||||
4488 | // entity of a type that is a derived class of the parameter | ||||
4489 | // type, a derived-to-base Conversion. | ||||
4490 | if (!Best->FinalConversion.DirectBinding) | ||||
4491 | return false; | ||||
4492 | |||||
4493 | ICS.setUserDefined(); | ||||
4494 | ICS.UserDefined.Before = Best->Conversions[0].Standard; | ||||
4495 | ICS.UserDefined.After = Best->FinalConversion; | ||||
4496 | ICS.UserDefined.HadMultipleCandidates = HadMultipleCandidates; | ||||
4497 | ICS.UserDefined.ConversionFunction = Best->Function; | ||||
4498 | ICS.UserDefined.FoundConversionFunction = Best->FoundDecl; | ||||
4499 | ICS.UserDefined.EllipsisConversion = false; | ||||
4500 | assert(ICS.UserDefined.After.ReferenceBinding &&((ICS.UserDefined.After.ReferenceBinding && ICS.UserDefined .After.DirectBinding && "Expected a direct reference binding!" ) ? static_cast<void> (0) : __assert_fail ("ICS.UserDefined.After.ReferenceBinding && ICS.UserDefined.After.DirectBinding && \"Expected a direct reference binding!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 4502, __PRETTY_FUNCTION__)) | ||||
4501 | ICS.UserDefined.After.DirectBinding &&((ICS.UserDefined.After.ReferenceBinding && ICS.UserDefined .After.DirectBinding && "Expected a direct reference binding!" ) ? static_cast<void> (0) : __assert_fail ("ICS.UserDefined.After.ReferenceBinding && ICS.UserDefined.After.DirectBinding && \"Expected a direct reference binding!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 4502, __PRETTY_FUNCTION__)) | ||||
4502 | "Expected a direct reference binding!")((ICS.UserDefined.After.ReferenceBinding && ICS.UserDefined .After.DirectBinding && "Expected a direct reference binding!" ) ? static_cast<void> (0) : __assert_fail ("ICS.UserDefined.After.ReferenceBinding && ICS.UserDefined.After.DirectBinding && \"Expected a direct reference binding!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 4502, __PRETTY_FUNCTION__)); | ||||
4503 | return true; | ||||
4504 | |||||
4505 | case OR_Ambiguous: | ||||
4506 | ICS.setAmbiguous(); | ||||
4507 | for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); | ||||
4508 | Cand != CandidateSet.end(); ++Cand) | ||||
4509 | if (Cand->Viable) | ||||
4510 | ICS.Ambiguous.addConversion(Cand->FoundDecl, Cand->Function); | ||||
4511 | return true; | ||||
4512 | |||||
4513 | case OR_No_Viable_Function: | ||||
4514 | case OR_Deleted: | ||||
4515 | // There was no suitable conversion, or we found a deleted | ||||
4516 | // conversion; continue with other checks. | ||||
4517 | return false; | ||||
4518 | } | ||||
4519 | |||||
4520 | llvm_unreachable("Invalid OverloadResult!")::llvm::llvm_unreachable_internal("Invalid OverloadResult!", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 4520); | ||||
4521 | } | ||||
4522 | |||||
4523 | /// Compute an implicit conversion sequence for reference | ||||
4524 | /// initialization. | ||||
4525 | static ImplicitConversionSequence | ||||
4526 | TryReferenceInit(Sema &S, Expr *Init, QualType DeclType, | ||||
4527 | SourceLocation DeclLoc, | ||||
4528 | bool SuppressUserConversions, | ||||
4529 | bool AllowExplicit) { | ||||
4530 | assert(DeclType->isReferenceType() && "Reference init needs a reference")((DeclType->isReferenceType() && "Reference init needs a reference" ) ? static_cast<void> (0) : __assert_fail ("DeclType->isReferenceType() && \"Reference init needs a reference\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 4530, __PRETTY_FUNCTION__)); | ||||
4531 | |||||
4532 | // Most paths end in a failed conversion. | ||||
4533 | ImplicitConversionSequence ICS; | ||||
4534 | ICS.setBad(BadConversionSequence::no_conversion, Init, DeclType); | ||||
4535 | |||||
4536 | QualType T1 = DeclType->castAs<ReferenceType>()->getPointeeType(); | ||||
4537 | QualType T2 = Init->getType(); | ||||
4538 | |||||
4539 | // If the initializer is the address of an overloaded function, try | ||||
4540 | // to resolve the overloaded function. If all goes well, T2 is the | ||||
4541 | // type of the resulting function. | ||||
4542 | if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy) { | ||||
4543 | DeclAccessPair Found; | ||||
4544 | if (FunctionDecl *Fn = S.ResolveAddressOfOverloadedFunction(Init, DeclType, | ||||
4545 | false, Found)) | ||||
4546 | T2 = Fn->getType(); | ||||
4547 | } | ||||
4548 | |||||
4549 | // Compute some basic properties of the types and the initializer. | ||||
4550 | bool isRValRef = DeclType->isRValueReferenceType(); | ||||
4551 | bool DerivedToBase = false; | ||||
4552 | bool ObjCConversion = false; | ||||
4553 | bool ObjCLifetimeConversion = false; | ||||
4554 | Expr::Classification InitCategory = Init->Classify(S.Context); | ||||
4555 | Sema::ReferenceCompareResult RefRelationship | ||||
4556 | = S.CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase, | ||||
4557 | ObjCConversion, ObjCLifetimeConversion); | ||||
4558 | |||||
4559 | |||||
4560 | // C++0x [dcl.init.ref]p5: | ||||
4561 | // A reference to type "cv1 T1" is initialized by an expression | ||||
4562 | // of type "cv2 T2" as follows: | ||||
4563 | |||||
4564 | // -- If reference is an lvalue reference and the initializer expression | ||||
4565 | if (!isRValRef) { | ||||
4566 | // -- is an lvalue (but is not a bit-field), and "cv1 T1" is | ||||
4567 | // reference-compatible with "cv2 T2," or | ||||
4568 | // | ||||
4569 | // Per C++ [over.ics.ref]p4, we don't check the bit-field property here. | ||||
4570 | if (InitCategory.isLValue() && RefRelationship == Sema::Ref_Compatible) { | ||||
4571 | // C++ [over.ics.ref]p1: | ||||
4572 | // When a parameter of reference type binds directly (8.5.3) | ||||
4573 | // to an argument expression, the implicit conversion sequence | ||||
4574 | // is the identity conversion, unless the argument expression | ||||
4575 | // has a type that is a derived class of the parameter type, | ||||
4576 | // in which case the implicit conversion sequence is a | ||||
4577 | // derived-to-base Conversion (13.3.3.1). | ||||
4578 | ICS.setStandard(); | ||||
4579 | ICS.Standard.First = ICK_Identity; | ||||
4580 | ICS.Standard.Second = DerivedToBase? ICK_Derived_To_Base | ||||
4581 | : ObjCConversion? ICK_Compatible_Conversion | ||||
4582 | : ICK_Identity; | ||||
4583 | ICS.Standard.Third = ICK_Identity; | ||||
4584 | ICS.Standard.FromTypePtr = T2.getAsOpaquePtr(); | ||||
4585 | ICS.Standard.setToType(0, T2); | ||||
4586 | ICS.Standard.setToType(1, T1); | ||||
4587 | ICS.Standard.setToType(2, T1); | ||||
4588 | ICS.Standard.ReferenceBinding = true; | ||||
4589 | ICS.Standard.DirectBinding = true; | ||||
4590 | ICS.Standard.IsLvalueReference = !isRValRef; | ||||
4591 | ICS.Standard.BindsToFunctionLvalue = T2->isFunctionType(); | ||||
4592 | ICS.Standard.BindsToRvalue = false; | ||||
4593 | ICS.Standard.BindsImplicitObjectArgumentWithoutRefQualifier = false; | ||||
4594 | ICS.Standard.ObjCLifetimeConversionBinding = ObjCLifetimeConversion; | ||||
4595 | ICS.Standard.CopyConstructor = nullptr; | ||||
4596 | ICS.Standard.DeprecatedStringLiteralToCharPtr = false; | ||||
4597 | |||||
4598 | // Nothing more to do: the inaccessibility/ambiguity check for | ||||
4599 | // derived-to-base conversions is suppressed when we're | ||||
4600 | // computing the implicit conversion sequence (C++ | ||||
4601 | // [over.best.ics]p2). | ||||
4602 | return ICS; | ||||
4603 | } | ||||
4604 | |||||
4605 | // -- has a class type (i.e., T2 is a class type), where T1 is | ||||
4606 | // not reference-related to T2, and can be implicitly | ||||
4607 | // converted to an lvalue of type "cv3 T3," where "cv1 T1" | ||||
4608 | // is reference-compatible with "cv3 T3" 92) (this | ||||
4609 | // conversion is selected by enumerating the applicable | ||||
4610 | // conversion functions (13.3.1.6) and choosing the best | ||||
4611 | // one through overload resolution (13.3)), | ||||
4612 | if (!SuppressUserConversions && T2->isRecordType() && | ||||
4613 | S.isCompleteType(DeclLoc, T2) && | ||||
4614 | RefRelationship == Sema::Ref_Incompatible) { | ||||
4615 | if (FindConversionForRefInit(S, ICS, DeclType, DeclLoc, | ||||
4616 | Init, T2, /*AllowRvalues=*/false, | ||||
4617 | AllowExplicit)) | ||||
4618 | return ICS; | ||||
4619 | } | ||||
4620 | } | ||||
4621 | |||||
4622 | // -- Otherwise, the reference shall be an lvalue reference to a | ||||
4623 | // non-volatile const type (i.e., cv1 shall be const), or the reference | ||||
4624 | // shall be an rvalue reference. | ||||
4625 | if (!isRValRef && (!T1.isConstQualified() || T1.isVolatileQualified())) | ||||
4626 | return ICS; | ||||
4627 | |||||
4628 | // -- If the initializer expression | ||||
4629 | // | ||||
4630 | // -- is an xvalue, class prvalue, array prvalue or function | ||||
4631 | // lvalue and "cv1 T1" is reference-compatible with "cv2 T2", or | ||||
4632 | if (RefRelationship == Sema::Ref_Compatible && | ||||
4633 | (InitCategory.isXValue() || | ||||
4634 | (InitCategory.isPRValue() && (T2->isRecordType() || T2->isArrayType())) || | ||||
4635 | (InitCategory.isLValue() && T2->isFunctionType()))) { | ||||
4636 | ICS.setStandard(); | ||||
4637 | ICS.Standard.First = ICK_Identity; | ||||
4638 | ICS.Standard.Second = DerivedToBase? ICK_Derived_To_Base | ||||
4639 | : ObjCConversion? ICK_Compatible_Conversion | ||||
4640 | : ICK_Identity; | ||||
4641 | ICS.Standard.Third = ICK_Identity; | ||||
4642 | ICS.Standard.FromTypePtr = T2.getAsOpaquePtr(); | ||||
4643 | ICS.Standard.setToType(0, T2); | ||||
4644 | ICS.Standard.setToType(1, T1); | ||||
4645 | ICS.Standard.setToType(2, T1); | ||||
4646 | ICS.Standard.ReferenceBinding = true; | ||||
4647 | // In C++0x, this is always a direct binding. In C++98/03, it's a direct | ||||
4648 | // binding unless we're binding to a class prvalue. | ||||
4649 | // Note: Although xvalues wouldn't normally show up in C++98/03 code, we | ||||
4650 | // allow the use of rvalue references in C++98/03 for the benefit of | ||||
4651 | // standard library implementors; therefore, we need the xvalue check here. | ||||
4652 | ICS.Standard.DirectBinding = | ||||
4653 | S.getLangOpts().CPlusPlus11 || | ||||
4654 | !(InitCategory.isPRValue() || T2->isRecordType()); | ||||
4655 | ICS.Standard.IsLvalueReference = !isRValRef; | ||||
4656 | ICS.Standard.BindsToFunctionLvalue = T2->isFunctionType(); | ||||
4657 | ICS.Standard.BindsToRvalue = InitCategory.isRValue(); | ||||
4658 | ICS.Standard.BindsImplicitObjectArgumentWithoutRefQualifier = false; | ||||
4659 | ICS.Standard.ObjCLifetimeConversionBinding = ObjCLifetimeConversion; | ||||
4660 | ICS.Standard.CopyConstructor = nullptr; | ||||
4661 | ICS.Standard.DeprecatedStringLiteralToCharPtr = false; | ||||
4662 | return ICS; | ||||
4663 | } | ||||
4664 | |||||
4665 | // -- has a class type (i.e., T2 is a class type), where T1 is not | ||||
4666 | // reference-related to T2, and can be implicitly converted to | ||||
4667 | // an xvalue, class prvalue, or function lvalue of type | ||||
4668 | // "cv3 T3", where "cv1 T1" is reference-compatible with | ||||
4669 | // "cv3 T3", | ||||
4670 | // | ||||
4671 | // then the reference is bound to the value of the initializer | ||||
4672 | // expression in the first case and to the result of the conversion | ||||
4673 | // in the second case (or, in either case, to an appropriate base | ||||
4674 | // class subobject). | ||||
4675 | if (!SuppressUserConversions && RefRelationship == Sema::Ref_Incompatible && | ||||
4676 | T2->isRecordType() && S.isCompleteType(DeclLoc, T2) && | ||||
4677 | FindConversionForRefInit(S, ICS, DeclType, DeclLoc, | ||||
4678 | Init, T2, /*AllowRvalues=*/true, | ||||
4679 | AllowExplicit)) { | ||||
4680 | // In the second case, if the reference is an rvalue reference | ||||
4681 | // and the second standard conversion sequence of the | ||||
4682 | // user-defined conversion sequence includes an lvalue-to-rvalue | ||||
4683 | // conversion, the program is ill-formed. | ||||
4684 | if (ICS.isUserDefined() && isRValRef && | ||||
4685 | ICS.UserDefined.After.First == ICK_Lvalue_To_Rvalue) | ||||
4686 | ICS.setBad(BadConversionSequence::no_conversion, Init, DeclType); | ||||
4687 | |||||
4688 | return ICS; | ||||
4689 | } | ||||
4690 | |||||
4691 | // A temporary of function type cannot be created; don't even try. | ||||
4692 | if (T1->isFunctionType()) | ||||
4693 | return ICS; | ||||
4694 | |||||
4695 | // -- Otherwise, a temporary of type "cv1 T1" is created and | ||||
4696 | // initialized from the initializer expression using the | ||||
4697 | // rules for a non-reference copy initialization (8.5). The | ||||
4698 | // reference is then bound to the temporary. If T1 is | ||||
4699 | // reference-related to T2, cv1 must be the same | ||||
4700 | // cv-qualification as, or greater cv-qualification than, | ||||
4701 | // cv2; otherwise, the program is ill-formed. | ||||
4702 | if (RefRelationship == Sema::Ref_Related) { | ||||
4703 | // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then | ||||
4704 | // we would be reference-compatible or reference-compatible with | ||||
4705 | // added qualification. But that wasn't the case, so the reference | ||||
4706 | // initialization fails. | ||||
4707 | // | ||||
4708 | // Note that we only want to check address spaces and cvr-qualifiers here. | ||||
4709 | // ObjC GC, lifetime and unaligned qualifiers aren't important. | ||||
4710 | Qualifiers T1Quals = T1.getQualifiers(); | ||||
4711 | Qualifiers T2Quals = T2.getQualifiers(); | ||||
4712 | T1Quals.removeObjCGCAttr(); | ||||
4713 | T1Quals.removeObjCLifetime(); | ||||
4714 | T2Quals.removeObjCGCAttr(); | ||||
4715 | T2Quals.removeObjCLifetime(); | ||||
4716 | // MS compiler ignores __unaligned qualifier for references; do the same. | ||||
4717 | T1Quals.removeUnaligned(); | ||||
4718 | T2Quals.removeUnaligned(); | ||||
4719 | if (!T1Quals.compatiblyIncludes(T2Quals)) | ||||
4720 | return ICS; | ||||
4721 | } | ||||
4722 | |||||
4723 | // If at least one of the types is a class type, the types are not | ||||
4724 | // related, and we aren't allowed any user conversions, the | ||||
4725 | // reference binding fails. This case is important for breaking | ||||
4726 | // recursion, since TryImplicitConversion below will attempt to | ||||
4727 | // create a temporary through the use of a copy constructor. | ||||
4728 | if (SuppressUserConversions && RefRelationship == Sema::Ref_Incompatible && | ||||
4729 | (T1->isRecordType() || T2->isRecordType())) | ||||
4730 | return ICS; | ||||
4731 | |||||
4732 | // If T1 is reference-related to T2 and the reference is an rvalue | ||||
4733 | // reference, the initializer expression shall not be an lvalue. | ||||
4734 | if (RefRelationship >= Sema::Ref_Related && | ||||
4735 | isRValRef && Init->Classify(S.Context).isLValue()) | ||||
4736 | return ICS; | ||||
4737 | |||||
4738 | // C++ [over.ics.ref]p2: | ||||
4739 | // When a parameter of reference type is not bound directly to | ||||
4740 | // an argument expression, the conversion sequence is the one | ||||
4741 | // required to convert the argument expression to the | ||||
4742 | // underlying type of the reference according to | ||||
4743 | // 13.3.3.1. Conceptually, this conversion sequence corresponds | ||||
4744 | // to copy-initializing a temporary of the underlying type with | ||||
4745 | // the argument expression. Any difference in top-level | ||||
4746 | // cv-qualification is subsumed by the initialization itself | ||||
4747 | // and does not constitute a conversion. | ||||
4748 | ICS = TryImplicitConversion(S, Init, T1, SuppressUserConversions, | ||||
4749 | /*AllowExplicit=*/false, | ||||
4750 | /*InOverloadResolution=*/false, | ||||
4751 | /*CStyle=*/false, | ||||
4752 | /*AllowObjCWritebackConversion=*/false, | ||||
4753 | /*AllowObjCConversionOnExplicit=*/false); | ||||
4754 | |||||
4755 | // Of course, that's still a reference binding. | ||||
4756 | if (ICS.isStandard()) { | ||||
4757 | ICS.Standard.ReferenceBinding = true; | ||||
4758 | ICS.Standard.IsLvalueReference = !isRValRef; | ||||
4759 | ICS.Standard.BindsToFunctionLvalue = false; | ||||
4760 | ICS.Standard.BindsToRvalue = true; | ||||
4761 | ICS.Standard.BindsImplicitObjectArgumentWithoutRefQualifier = false; | ||||
4762 | ICS.Standard.ObjCLifetimeConversionBinding = false; | ||||
4763 | } else if (ICS.isUserDefined()) { | ||||
4764 | const ReferenceType *LValRefType = | ||||
4765 | ICS.UserDefined.ConversionFunction->getReturnType() | ||||
4766 | ->getAs<LValueReferenceType>(); | ||||
4767 | |||||
4768 | // C++ [over.ics.ref]p3: | ||||
4769 | // Except for an implicit object parameter, for which see 13.3.1, a | ||||
4770 | // standard conversion sequence cannot be formed if it requires [...] | ||||
4771 | // binding an rvalue reference to an lvalue other than a function | ||||
4772 | // lvalue. | ||||
4773 | // Note that the function case is not possible here. | ||||
4774 | if (DeclType->isRValueReferenceType() && LValRefType) { | ||||
4775 | // FIXME: This is the wrong BadConversionSequence. The problem is binding | ||||
4776 | // an rvalue reference to a (non-function) lvalue, not binding an lvalue | ||||
4777 | // reference to an rvalue! | ||||
4778 | ICS.setBad(BadConversionSequence::lvalue_ref_to_rvalue, Init, DeclType); | ||||
4779 | return ICS; | ||||
4780 | } | ||||
4781 | |||||
4782 | ICS.UserDefined.After.ReferenceBinding = true; | ||||
4783 | ICS.UserDefined.After.IsLvalueReference = !isRValRef; | ||||
4784 | ICS.UserDefined.After.BindsToFunctionLvalue = false; | ||||
4785 | ICS.UserDefined.After.BindsToRvalue = !LValRefType; | ||||
4786 | ICS.UserDefined.After.BindsImplicitObjectArgumentWithoutRefQualifier = false; | ||||
4787 | ICS.UserDefined.After.ObjCLifetimeConversionBinding = false; | ||||
4788 | } | ||||
4789 | |||||
4790 | return ICS; | ||||
4791 | } | ||||
4792 | |||||
4793 | static ImplicitConversionSequence | ||||
4794 | TryCopyInitialization(Sema &S, Expr *From, QualType ToType, | ||||
4795 | bool SuppressUserConversions, | ||||
4796 | bool InOverloadResolution, | ||||
4797 | bool AllowObjCWritebackConversion, | ||||
4798 | bool AllowExplicit = false); | ||||
4799 | |||||
4800 | /// TryListConversion - Try to copy-initialize a value of type ToType from the | ||||
4801 | /// initializer list From. | ||||
4802 | static ImplicitConversionSequence | ||||
4803 | TryListConversion(Sema &S, InitListExpr *From, QualType ToType, | ||||
4804 | bool SuppressUserConversions, | ||||
4805 | bool InOverloadResolution, | ||||
4806 | bool AllowObjCWritebackConversion) { | ||||
4807 | // C++11 [over.ics.list]p1: | ||||
4808 | // When an argument is an initializer list, it is not an expression and | ||||
4809 | // special rules apply for converting it to a parameter type. | ||||
4810 | |||||
4811 | ImplicitConversionSequence Result; | ||||
4812 | Result.setBad(BadConversionSequence::no_conversion, From, ToType); | ||||
4813 | |||||
4814 | // We need a complete type for what follows. Incomplete types can never be | ||||
4815 | // initialized from init lists. | ||||
4816 | if (!S.isCompleteType(From->getBeginLoc(), ToType)) | ||||
4817 | return Result; | ||||
4818 | |||||
4819 | // Per DR1467: | ||||
4820 | // If the parameter type is a class X and the initializer list has a single | ||||
4821 | // element of type cv U, where U is X or a class derived from X, the | ||||
4822 | // implicit conversion sequence is the one required to convert the element | ||||
4823 | // to the parameter type. | ||||
4824 | // | ||||
4825 | // Otherwise, if the parameter type is a character array [... ] | ||||
4826 | // and the initializer list has a single element that is an | ||||
4827 | // appropriately-typed string literal (8.5.2 [dcl.init.string]), the | ||||
4828 | // implicit conversion sequence is the identity conversion. | ||||
4829 | if (From->getNumInits() == 1) { | ||||
4830 | if (ToType->isRecordType()) { | ||||
4831 | QualType InitType = From->getInit(0)->getType(); | ||||
4832 | if (S.Context.hasSameUnqualifiedType(InitType, ToType) || | ||||
4833 | S.IsDerivedFrom(From->getBeginLoc(), InitType, ToType)) | ||||
4834 | return TryCopyInitialization(S, From->getInit(0), ToType, | ||||
4835 | SuppressUserConversions, | ||||
4836 | InOverloadResolution, | ||||
4837 | AllowObjCWritebackConversion); | ||||
4838 | } | ||||
4839 | // FIXME: Check the other conditions here: array of character type, | ||||
4840 | // initializer is a string literal. | ||||
4841 | if (ToType->isArrayType()) { | ||||
4842 | InitializedEntity Entity = | ||||
4843 | InitializedEntity::InitializeParameter(S.Context, ToType, | ||||
4844 | /*Consumed=*/false); | ||||
4845 | if (S.CanPerformCopyInitialization(Entity, From)) { | ||||
4846 | Result.setStandard(); | ||||
4847 | Result.Standard.setAsIdentityConversion(); | ||||
4848 | Result.Standard.setFromType(ToType); | ||||
4849 | Result.Standard.setAllToTypes(ToType); | ||||
4850 | return Result; | ||||
4851 | } | ||||
4852 | } | ||||
4853 | } | ||||
4854 | |||||
4855 | // C++14 [over.ics.list]p2: Otherwise, if the parameter type [...] (below). | ||||
4856 | // C++11 [over.ics.list]p2: | ||||
4857 | // If the parameter type is std::initializer_list<X> or "array of X" and | ||||
4858 | // all the elements can be implicitly converted to X, the implicit | ||||
4859 | // conversion sequence is the worst conversion necessary to convert an | ||||
4860 | // element of the list to X. | ||||
4861 | // | ||||
4862 | // C++14 [over.ics.list]p3: | ||||
4863 | // Otherwise, if the parameter type is "array of N X", if the initializer | ||||
4864 | // list has exactly N elements or if it has fewer than N elements and X is | ||||
4865 | // default-constructible, and if all the elements of the initializer list | ||||
4866 | // can be implicitly converted to X, the implicit conversion sequence is | ||||
4867 | // the worst conversion necessary to convert an element of the list to X. | ||||
4868 | // | ||||
4869 | // FIXME: We're missing a lot of these checks. | ||||
4870 | bool toStdInitializerList = false; | ||||
4871 | QualType X; | ||||
4872 | if (ToType->isArrayType()) | ||||
4873 | X = S.Context.getAsArrayType(ToType)->getElementType(); | ||||
4874 | else | ||||
4875 | toStdInitializerList = S.isStdInitializerList(ToType, &X); | ||||
4876 | if (!X.isNull()) { | ||||
4877 | for (unsigned i = 0, e = From->getNumInits(); i < e; ++i) { | ||||
4878 | Expr *Init = From->getInit(i); | ||||
4879 | ImplicitConversionSequence ICS = | ||||
4880 | TryCopyInitialization(S, Init, X, SuppressUserConversions, | ||||
4881 | InOverloadResolution, | ||||
4882 | AllowObjCWritebackConversion); | ||||
4883 | // If a single element isn't convertible, fail. | ||||
4884 | if (ICS.isBad()) { | ||||
4885 | Result = ICS; | ||||
4886 | break; | ||||
4887 | } | ||||
4888 | // Otherwise, look for the worst conversion. | ||||
4889 | if (Result.isBad() || CompareImplicitConversionSequences( | ||||
4890 | S, From->getBeginLoc(), ICS, Result) == | ||||
4891 | ImplicitConversionSequence::Worse) | ||||
4892 | Result = ICS; | ||||
4893 | } | ||||
4894 | |||||
4895 | // For an empty list, we won't have computed any conversion sequence. | ||||
4896 | // Introduce the identity conversion sequence. | ||||
4897 | if (From->getNumInits() == 0) { | ||||
4898 | Result.setStandard(); | ||||
4899 | Result.Standard.setAsIdentityConversion(); | ||||
4900 | Result.Standard.setFromType(ToType); | ||||
4901 | Result.Standard.setAllToTypes(ToType); | ||||
4902 | } | ||||
4903 | |||||
4904 | Result.setStdInitializerListElement(toStdInitializerList); | ||||
4905 | return Result; | ||||
4906 | } | ||||
4907 | |||||
4908 | // C++14 [over.ics.list]p4: | ||||
4909 | // C++11 [over.ics.list]p3: | ||||
4910 | // Otherwise, if the parameter is a non-aggregate class X and overload | ||||
4911 | // resolution chooses a single best constructor [...] the implicit | ||||
4912 | // conversion sequence is a user-defined conversion sequence. If multiple | ||||
4913 | // constructors are viable but none is better than the others, the | ||||
4914 | // implicit conversion sequence is a user-defined conversion sequence. | ||||
4915 | if (ToType->isRecordType() && !ToType->isAggregateType()) { | ||||
4916 | // This function can deal with initializer lists. | ||||
4917 | return TryUserDefinedConversion(S, From, ToType, SuppressUserConversions, | ||||
4918 | /*AllowExplicit=*/false, | ||||
4919 | InOverloadResolution, /*CStyle=*/false, | ||||
4920 | AllowObjCWritebackConversion, | ||||
4921 | /*AllowObjCConversionOnExplicit=*/false); | ||||
4922 | } | ||||
4923 | |||||
4924 | // C++14 [over.ics.list]p5: | ||||
4925 | // C++11 [over.ics.list]p4: | ||||
4926 | // Otherwise, if the parameter has an aggregate type which can be | ||||
4927 | // initialized from the initializer list [...] the implicit conversion | ||||
4928 | // sequence is a user-defined conversion sequence. | ||||
4929 | if (ToType->isAggregateType()) { | ||||
4930 | // Type is an aggregate, argument is an init list. At this point it comes | ||||
4931 | // down to checking whether the initialization works. | ||||
4932 | // FIXME: Find out whether this parameter is consumed or not. | ||||
4933 | InitializedEntity Entity = | ||||
4934 | InitializedEntity::InitializeParameter(S.Context, ToType, | ||||
4935 | /*Consumed=*/false); | ||||
4936 | if (S.CanPerformAggregateInitializationForOverloadResolution(Entity, | ||||
4937 | From)) { | ||||
4938 | Result.setUserDefined(); | ||||
4939 | Result.UserDefined.Before.setAsIdentityConversion(); | ||||
4940 | // Initializer lists don't have a type. | ||||
4941 | Result.UserDefined.Before.setFromType(QualType()); | ||||
4942 | Result.UserDefined.Before.setAllToTypes(QualType()); | ||||
4943 | |||||
4944 | Result.UserDefined.After.setAsIdentityConversion(); | ||||
4945 | Result.UserDefined.After.setFromType(ToType); | ||||
4946 | Result.UserDefined.After.setAllToTypes(ToType); | ||||
4947 | Result.UserDefined.ConversionFunction = nullptr; | ||||
4948 | } | ||||
4949 | return Result; | ||||
4950 | } | ||||
4951 | |||||
4952 | // C++14 [over.ics.list]p6: | ||||
4953 | // C++11 [over.ics.list]p5: | ||||
4954 | // Otherwise, if the parameter is a reference, see 13.3.3.1.4. | ||||
4955 | if (ToType->isReferenceType()) { | ||||
4956 | // The standard is notoriously unclear here, since 13.3.3.1.4 doesn't | ||||
4957 | // mention initializer lists in any way. So we go by what list- | ||||
4958 | // initialization would do and try to extrapolate from that. | ||||
4959 | |||||
4960 | QualType T1 = ToType->castAs<ReferenceType>()->getPointeeType(); | ||||
4961 | |||||
4962 | // If the initializer list has a single element that is reference-related | ||||
4963 | // to the parameter type, we initialize the reference from that. | ||||
4964 | if (From->getNumInits() == 1) { | ||||
4965 | Expr *Init = From->getInit(0); | ||||
4966 | |||||
4967 | QualType T2 = Init->getType(); | ||||
4968 | |||||
4969 | // If the initializer is the address of an overloaded function, try | ||||
4970 | // to resolve the overloaded function. If all goes well, T2 is the | ||||
4971 | // type of the resulting function. | ||||
4972 | if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy) { | ||||
4973 | DeclAccessPair Found; | ||||
4974 | if (FunctionDecl *Fn = S.ResolveAddressOfOverloadedFunction( | ||||
4975 | Init, ToType, false, Found)) | ||||
4976 | T2 = Fn->getType(); | ||||
4977 | } | ||||
4978 | |||||
4979 | // Compute some basic properties of the types and the initializer. | ||||
4980 | bool dummy1 = false; | ||||
4981 | bool dummy2 = false; | ||||
4982 | bool dummy3 = false; | ||||
4983 | Sema::ReferenceCompareResult RefRelationship = | ||||
4984 | S.CompareReferenceRelationship(From->getBeginLoc(), T1, T2, dummy1, | ||||
4985 | dummy2, dummy3); | ||||
4986 | |||||
4987 | if (RefRelationship >= Sema::Ref_Related) { | ||||
4988 | return TryReferenceInit(S, Init, ToType, /*FIXME*/ From->getBeginLoc(), | ||||
4989 | SuppressUserConversions, | ||||
4990 | /*AllowExplicit=*/false); | ||||
4991 | } | ||||
4992 | } | ||||
4993 | |||||
4994 | // Otherwise, we bind the reference to a temporary created from the | ||||
4995 | // initializer list. | ||||
4996 | Result = TryListConversion(S, From, T1, SuppressUserConversions, | ||||
4997 | InOverloadResolution, | ||||
4998 | AllowObjCWritebackConversion); | ||||
4999 | if (Result.isFailure()) | ||||
5000 | return Result; | ||||
5001 | assert(!Result.isEllipsis() &&((!Result.isEllipsis() && "Sub-initialization cannot result in ellipsis conversion." ) ? static_cast<void> (0) : __assert_fail ("!Result.isEllipsis() && \"Sub-initialization cannot result in ellipsis conversion.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5002, __PRETTY_FUNCTION__)) | ||||
5002 | "Sub-initialization cannot result in ellipsis conversion.")((!Result.isEllipsis() && "Sub-initialization cannot result in ellipsis conversion." ) ? static_cast<void> (0) : __assert_fail ("!Result.isEllipsis() && \"Sub-initialization cannot result in ellipsis conversion.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5002, __PRETTY_FUNCTION__)); | ||||
5003 | |||||
5004 | // Can we even bind to a temporary? | ||||
5005 | if (ToType->isRValueReferenceType() || | ||||
5006 | (T1.isConstQualified() && !T1.isVolatileQualified())) { | ||||
5007 | StandardConversionSequence &SCS = Result.isStandard() ? Result.Standard : | ||||
5008 | Result.UserDefined.After; | ||||
5009 | SCS.ReferenceBinding = true; | ||||
5010 | SCS.IsLvalueReference = ToType->isLValueReferenceType(); | ||||
5011 | SCS.BindsToRvalue = true; | ||||
5012 | SCS.BindsToFunctionLvalue = false; | ||||
5013 | SCS.BindsImplicitObjectArgumentWithoutRefQualifier = false; | ||||
5014 | SCS.ObjCLifetimeConversionBinding = false; | ||||
5015 | } else | ||||
5016 | Result.setBad(BadConversionSequence::lvalue_ref_to_rvalue, | ||||
5017 | From, ToType); | ||||
5018 | return Result; | ||||
5019 | } | ||||
5020 | |||||
5021 | // C++14 [over.ics.list]p7: | ||||
5022 | // C++11 [over.ics.list]p6: | ||||
5023 | // Otherwise, if the parameter type is not a class: | ||||
5024 | if (!ToType->isRecordType()) { | ||||
5025 | // - if the initializer list has one element that is not itself an | ||||
5026 | // initializer list, the implicit conversion sequence is the one | ||||
5027 | // required to convert the element to the parameter type. | ||||
5028 | unsigned NumInits = From->getNumInits(); | ||||
5029 | if (NumInits == 1 && !isa<InitListExpr>(From->getInit(0))) | ||||
5030 | Result = TryCopyInitialization(S, From->getInit(0), ToType, | ||||
5031 | SuppressUserConversions, | ||||
5032 | InOverloadResolution, | ||||
5033 | AllowObjCWritebackConversion); | ||||
5034 | // - if the initializer list has no elements, the implicit conversion | ||||
5035 | // sequence is the identity conversion. | ||||
5036 | else if (NumInits == 0) { | ||||
5037 | Result.setStandard(); | ||||
5038 | Result.Standard.setAsIdentityConversion(); | ||||
5039 | Result.Standard.setFromType(ToType); | ||||
5040 | Result.Standard.setAllToTypes(ToType); | ||||
5041 | } | ||||
5042 | return Result; | ||||
5043 | } | ||||
5044 | |||||
5045 | // C++14 [over.ics.list]p8: | ||||
5046 | // C++11 [over.ics.list]p7: | ||||
5047 | // In all cases other than those enumerated above, no conversion is possible | ||||
5048 | return Result; | ||||
5049 | } | ||||
5050 | |||||
5051 | /// TryCopyInitialization - Try to copy-initialize a value of type | ||||
5052 | /// ToType from the expression From. Return the implicit conversion | ||||
5053 | /// sequence required to pass this argument, which may be a bad | ||||
5054 | /// conversion sequence (meaning that the argument cannot be passed to | ||||
5055 | /// a parameter of this type). If @p SuppressUserConversions, then we | ||||
5056 | /// do not permit any user-defined conversion sequences. | ||||
5057 | static ImplicitConversionSequence | ||||
5058 | TryCopyInitialization(Sema &S, Expr *From, QualType ToType, | ||||
5059 | bool SuppressUserConversions, | ||||
5060 | bool InOverloadResolution, | ||||
5061 | bool AllowObjCWritebackConversion, | ||||
5062 | bool AllowExplicit) { | ||||
5063 | if (InitListExpr *FromInitList = dyn_cast<InitListExpr>(From)) | ||||
5064 | return TryListConversion(S, FromInitList, ToType, SuppressUserConversions, | ||||
5065 | InOverloadResolution,AllowObjCWritebackConversion); | ||||
5066 | |||||
5067 | if (ToType->isReferenceType()) | ||||
5068 | return TryReferenceInit(S, From, ToType, | ||||
5069 | /*FIXME:*/ From->getBeginLoc(), | ||||
5070 | SuppressUserConversions, AllowExplicit); | ||||
5071 | |||||
5072 | return TryImplicitConversion(S, From, ToType, | ||||
5073 | SuppressUserConversions, | ||||
5074 | /*AllowExplicit=*/false, | ||||
5075 | InOverloadResolution, | ||||
5076 | /*CStyle=*/false, | ||||
5077 | AllowObjCWritebackConversion, | ||||
5078 | /*AllowObjCConversionOnExplicit=*/false); | ||||
5079 | } | ||||
5080 | |||||
5081 | static bool TryCopyInitialization(const CanQualType FromQTy, | ||||
5082 | const CanQualType ToQTy, | ||||
5083 | Sema &S, | ||||
5084 | SourceLocation Loc, | ||||
5085 | ExprValueKind FromVK) { | ||||
5086 | OpaqueValueExpr TmpExpr(Loc, FromQTy, FromVK); | ||||
5087 | ImplicitConversionSequence ICS = | ||||
5088 | TryCopyInitialization(S, &TmpExpr, ToQTy, true, true, false); | ||||
5089 | |||||
5090 | return !ICS.isBad(); | ||||
5091 | } | ||||
5092 | |||||
5093 | /// TryObjectArgumentInitialization - Try to initialize the object | ||||
5094 | /// parameter of the given member function (@c Method) from the | ||||
5095 | /// expression @p From. | ||||
5096 | static ImplicitConversionSequence | ||||
5097 | TryObjectArgumentInitialization(Sema &S, SourceLocation Loc, QualType FromType, | ||||
5098 | Expr::Classification FromClassification, | ||||
5099 | CXXMethodDecl *Method, | ||||
5100 | CXXRecordDecl *ActingContext) { | ||||
5101 | QualType ClassType = S.Context.getTypeDeclType(ActingContext); | ||||
5102 | // [class.dtor]p2: A destructor can be invoked for a const, volatile or | ||||
5103 | // const volatile object. | ||||
5104 | Qualifiers Quals = Method->getMethodQualifiers(); | ||||
5105 | if (isa<CXXDestructorDecl>(Method)) { | ||||
5106 | Quals.addConst(); | ||||
5107 | Quals.addVolatile(); | ||||
5108 | } | ||||
5109 | |||||
5110 | QualType ImplicitParamType = S.Context.getQualifiedType(ClassType, Quals); | ||||
5111 | |||||
5112 | // Set up the conversion sequence as a "bad" conversion, to allow us | ||||
5113 | // to exit early. | ||||
5114 | ImplicitConversionSequence ICS; | ||||
5115 | |||||
5116 | // We need to have an object of class type. | ||||
5117 | if (const PointerType *PT = FromType->getAs<PointerType>()) { | ||||
5118 | FromType = PT->getPointeeType(); | ||||
5119 | |||||
5120 | // When we had a pointer, it's implicitly dereferenced, so we | ||||
5121 | // better have an lvalue. | ||||
5122 | assert(FromClassification.isLValue())((FromClassification.isLValue()) ? static_cast<void> (0 ) : __assert_fail ("FromClassification.isLValue()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5122, __PRETTY_FUNCTION__)); | ||||
5123 | } | ||||
5124 | |||||
5125 | assert(FromType->isRecordType())((FromType->isRecordType()) ? static_cast<void> (0) : __assert_fail ("FromType->isRecordType()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5125, __PRETTY_FUNCTION__)); | ||||
5126 | |||||
5127 | // C++0x [over.match.funcs]p4: | ||||
5128 | // For non-static member functions, the type of the implicit object | ||||
5129 | // parameter is | ||||
5130 | // | ||||
5131 | // - "lvalue reference to cv X" for functions declared without a | ||||
5132 | // ref-qualifier or with the & ref-qualifier | ||||
5133 | // - "rvalue reference to cv X" for functions declared with the && | ||||
5134 | // ref-qualifier | ||||
5135 | // | ||||
5136 | // where X is the class of which the function is a member and cv is the | ||||
5137 | // cv-qualification on the member function declaration. | ||||
5138 | // | ||||
5139 | // However, when finding an implicit conversion sequence for the argument, we | ||||
5140 | // are not allowed to perform user-defined conversions | ||||
5141 | // (C++ [over.match.funcs]p5). We perform a simplified version of | ||||
5142 | // reference binding here, that allows class rvalues to bind to | ||||
5143 | // non-constant references. | ||||
5144 | |||||
5145 | // First check the qualifiers. | ||||
5146 | QualType FromTypeCanon = S.Context.getCanonicalType(FromType); | ||||
5147 | if (ImplicitParamType.getCVRQualifiers() | ||||
5148 | != FromTypeCanon.getLocalCVRQualifiers() && | ||||
5149 | !ImplicitParamType.isAtLeastAsQualifiedAs(FromTypeCanon)) { | ||||
5150 | ICS.setBad(BadConversionSequence::bad_qualifiers, | ||||
5151 | FromType, ImplicitParamType); | ||||
5152 | return ICS; | ||||
5153 | } | ||||
5154 | |||||
5155 | if (FromTypeCanon.getQualifiers().hasAddressSpace()) { | ||||
5156 | Qualifiers QualsImplicitParamType = ImplicitParamType.getQualifiers(); | ||||
5157 | Qualifiers QualsFromType = FromTypeCanon.getQualifiers(); | ||||
5158 | if (!QualsImplicitParamType.isAddressSpaceSupersetOf(QualsFromType)) { | ||||
5159 | ICS.setBad(BadConversionSequence::bad_qualifiers, | ||||
5160 | FromType, ImplicitParamType); | ||||
5161 | return ICS; | ||||
5162 | } | ||||
5163 | } | ||||
5164 | |||||
5165 | // Check that we have either the same type or a derived type. It | ||||
5166 | // affects the conversion rank. | ||||
5167 | QualType ClassTypeCanon = S.Context.getCanonicalType(ClassType); | ||||
5168 | ImplicitConversionKind SecondKind; | ||||
5169 | if (ClassTypeCanon == FromTypeCanon.getLocalUnqualifiedType()) { | ||||
5170 | SecondKind = ICK_Identity; | ||||
5171 | } else if (S.IsDerivedFrom(Loc, FromType, ClassType)) | ||||
5172 | SecondKind = ICK_Derived_To_Base; | ||||
5173 | else { | ||||
5174 | ICS.setBad(BadConversionSequence::unrelated_class, | ||||
5175 | FromType, ImplicitParamType); | ||||
5176 | return ICS; | ||||
5177 | } | ||||
5178 | |||||
5179 | // Check the ref-qualifier. | ||||
5180 | switch (Method->getRefQualifier()) { | ||||
5181 | case RQ_None: | ||||
5182 | // Do nothing; we don't care about lvalueness or rvalueness. | ||||
5183 | break; | ||||
5184 | |||||
5185 | case RQ_LValue: | ||||
5186 | if (!FromClassification.isLValue() && !Quals.hasOnlyConst()) { | ||||
5187 | // non-const lvalue reference cannot bind to an rvalue | ||||
5188 | ICS.setBad(BadConversionSequence::lvalue_ref_to_rvalue, FromType, | ||||
5189 | ImplicitParamType); | ||||
5190 | return ICS; | ||||
5191 | } | ||||
5192 | break; | ||||
5193 | |||||
5194 | case RQ_RValue: | ||||
5195 | if (!FromClassification.isRValue()) { | ||||
5196 | // rvalue reference cannot bind to an lvalue | ||||
5197 | ICS.setBad(BadConversionSequence::rvalue_ref_to_lvalue, FromType, | ||||
5198 | ImplicitParamType); | ||||
5199 | return ICS; | ||||
5200 | } | ||||
5201 | break; | ||||
5202 | } | ||||
5203 | |||||
5204 | // Success. Mark this as a reference binding. | ||||
5205 | ICS.setStandard(); | ||||
5206 | ICS.Standard.setAsIdentityConversion(); | ||||
5207 | ICS.Standard.Second = SecondKind; | ||||
5208 | ICS.Standard.setFromType(FromType); | ||||
5209 | ICS.Standard.setAllToTypes(ImplicitParamType); | ||||
5210 | ICS.Standard.ReferenceBinding = true; | ||||
5211 | ICS.Standard.DirectBinding = true; | ||||
5212 | ICS.Standard.IsLvalueReference = Method->getRefQualifier() != RQ_RValue; | ||||
5213 | ICS.Standard.BindsToFunctionLvalue = false; | ||||
5214 | ICS.Standard.BindsToRvalue = FromClassification.isRValue(); | ||||
5215 | ICS.Standard.BindsImplicitObjectArgumentWithoutRefQualifier | ||||
5216 | = (Method->getRefQualifier() == RQ_None); | ||||
5217 | return ICS; | ||||
5218 | } | ||||
5219 | |||||
5220 | /// PerformObjectArgumentInitialization - Perform initialization of | ||||
5221 | /// the implicit object parameter for the given Method with the given | ||||
5222 | /// expression. | ||||
5223 | ExprResult | ||||
5224 | Sema::PerformObjectArgumentInitialization(Expr *From, | ||||
5225 | NestedNameSpecifier *Qualifier, | ||||
5226 | NamedDecl *FoundDecl, | ||||
5227 | CXXMethodDecl *Method) { | ||||
5228 | QualType FromRecordType, DestType; | ||||
5229 | QualType ImplicitParamRecordType = | ||||
5230 | Method->getThisType()->castAs<PointerType>()->getPointeeType(); | ||||
5231 | |||||
5232 | Expr::Classification FromClassification; | ||||
5233 | if (const PointerType *PT = From->getType()->getAs<PointerType>()) { | ||||
5234 | FromRecordType = PT->getPointeeType(); | ||||
5235 | DestType = Method->getThisType(); | ||||
5236 | FromClassification = Expr::Classification::makeSimpleLValue(); | ||||
5237 | } else { | ||||
5238 | FromRecordType = From->getType(); | ||||
5239 | DestType = ImplicitParamRecordType; | ||||
5240 | FromClassification = From->Classify(Context); | ||||
5241 | |||||
5242 | // When performing member access on an rvalue, materialize a temporary. | ||||
5243 | if (From->isRValue()) { | ||||
5244 | From = CreateMaterializeTemporaryExpr(FromRecordType, From, | ||||
5245 | Method->getRefQualifier() != | ||||
5246 | RefQualifierKind::RQ_RValue); | ||||
5247 | } | ||||
5248 | } | ||||
5249 | |||||
5250 | // Note that we always use the true parent context when performing | ||||
5251 | // the actual argument initialization. | ||||
5252 | ImplicitConversionSequence ICS = TryObjectArgumentInitialization( | ||||
5253 | *this, From->getBeginLoc(), From->getType(), FromClassification, Method, | ||||
5254 | Method->getParent()); | ||||
5255 | if (ICS.isBad()) { | ||||
5256 | switch (ICS.Bad.Kind) { | ||||
5257 | case BadConversionSequence::bad_qualifiers: { | ||||
5258 | Qualifiers FromQs = FromRecordType.getQualifiers(); | ||||
5259 | Qualifiers ToQs = DestType.getQualifiers(); | ||||
5260 | unsigned CVR = FromQs.getCVRQualifiers() & ~ToQs.getCVRQualifiers(); | ||||
5261 | if (CVR) { | ||||
5262 | Diag(From->getBeginLoc(), diag::err_member_function_call_bad_cvr) | ||||
5263 | << Method->getDeclName() << FromRecordType << (CVR - 1) | ||||
5264 | << From->getSourceRange(); | ||||
5265 | Diag(Method->getLocation(), diag::note_previous_decl) | ||||
5266 | << Method->getDeclName(); | ||||
5267 | return ExprError(); | ||||
5268 | } | ||||
5269 | break; | ||||
5270 | } | ||||
5271 | |||||
5272 | case BadConversionSequence::lvalue_ref_to_rvalue: | ||||
5273 | case BadConversionSequence::rvalue_ref_to_lvalue: { | ||||
5274 | bool IsRValueQualified = | ||||
5275 | Method->getRefQualifier() == RefQualifierKind::RQ_RValue; | ||||
5276 | Diag(From->getBeginLoc(), diag::err_member_function_call_bad_ref) | ||||
5277 | << Method->getDeclName() << FromClassification.isRValue() | ||||
5278 | << IsRValueQualified; | ||||
5279 | Diag(Method->getLocation(), diag::note_previous_decl) | ||||
5280 | << Method->getDeclName(); | ||||
5281 | return ExprError(); | ||||
5282 | } | ||||
5283 | |||||
5284 | case BadConversionSequence::no_conversion: | ||||
5285 | case BadConversionSequence::unrelated_class: | ||||
5286 | break; | ||||
5287 | } | ||||
5288 | |||||
5289 | return Diag(From->getBeginLoc(), diag::err_member_function_call_bad_type) | ||||
5290 | << ImplicitParamRecordType << FromRecordType | ||||
5291 | << From->getSourceRange(); | ||||
5292 | } | ||||
5293 | |||||
5294 | if (ICS.Standard.Second == ICK_Derived_To_Base) { | ||||
5295 | ExprResult FromRes = | ||||
5296 | PerformObjectMemberConversion(From, Qualifier, FoundDecl, Method); | ||||
5297 | if (FromRes.isInvalid()) | ||||
5298 | return ExprError(); | ||||
5299 | From = FromRes.get(); | ||||
5300 | } | ||||
5301 | |||||
5302 | if (!Context.hasSameType(From->getType(), DestType)) { | ||||
5303 | CastKind CK; | ||||
5304 | if (FromRecordType.getAddressSpace() != DestType.getAddressSpace()) | ||||
5305 | CK = CK_AddressSpaceConversion; | ||||
5306 | else | ||||
5307 | CK = CK_NoOp; | ||||
5308 | From = ImpCastExprToType(From, DestType, CK, From->getValueKind()).get(); | ||||
5309 | } | ||||
5310 | return From; | ||||
5311 | } | ||||
5312 | |||||
5313 | /// TryContextuallyConvertToBool - Attempt to contextually convert the | ||||
5314 | /// expression From to bool (C++0x [conv]p3). | ||||
5315 | static ImplicitConversionSequence | ||||
5316 | TryContextuallyConvertToBool(Sema &S, Expr *From) { | ||||
5317 | return TryImplicitConversion(S, From, S.Context.BoolTy, | ||||
5318 | /*SuppressUserConversions=*/false, | ||||
5319 | /*AllowExplicit=*/true, | ||||
5320 | /*InOverloadResolution=*/false, | ||||
5321 | /*CStyle=*/false, | ||||
5322 | /*AllowObjCWritebackConversion=*/false, | ||||
5323 | /*AllowObjCConversionOnExplicit=*/false); | ||||
5324 | } | ||||
5325 | |||||
5326 | /// PerformContextuallyConvertToBool - Perform a contextual conversion | ||||
5327 | /// of the expression From to bool (C++0x [conv]p3). | ||||
5328 | ExprResult Sema::PerformContextuallyConvertToBool(Expr *From) { | ||||
5329 | if (checkPlaceholderForOverload(*this, From)) | ||||
5330 | return ExprError(); | ||||
5331 | |||||
5332 | ImplicitConversionSequence ICS = TryContextuallyConvertToBool(*this, From); | ||||
5333 | if (!ICS.isBad()) | ||||
5334 | return PerformImplicitConversion(From, Context.BoolTy, ICS, AA_Converting); | ||||
5335 | |||||
5336 | if (!DiagnoseMultipleUserDefinedConversion(From, Context.BoolTy)) | ||||
5337 | return Diag(From->getBeginLoc(), diag::err_typecheck_bool_condition) | ||||
5338 | << From->getType() << From->getSourceRange(); | ||||
5339 | return ExprError(); | ||||
5340 | } | ||||
5341 | |||||
5342 | /// Check that the specified conversion is permitted in a converted constant | ||||
5343 | /// expression, according to C++11 [expr.const]p3. Return true if the conversion | ||||
5344 | /// is acceptable. | ||||
5345 | static bool CheckConvertedConstantConversions(Sema &S, | ||||
5346 | StandardConversionSequence &SCS) { | ||||
5347 | // Since we know that the target type is an integral or unscoped enumeration | ||||
5348 | // type, most conversion kinds are impossible. All possible First and Third | ||||
5349 | // conversions are fine. | ||||
5350 | switch (SCS.Second) { | ||||
5351 | case ICK_Identity: | ||||
5352 | case ICK_Function_Conversion: | ||||
5353 | case ICK_Integral_Promotion: | ||||
5354 | case ICK_Integral_Conversion: // Narrowing conversions are checked elsewhere. | ||||
5355 | case ICK_Zero_Queue_Conversion: | ||||
5356 | return true; | ||||
5357 | |||||
5358 | case ICK_Boolean_Conversion: | ||||
5359 | // Conversion from an integral or unscoped enumeration type to bool is | ||||
5360 | // classified as ICK_Boolean_Conversion, but it's also arguably an integral | ||||
5361 | // conversion, so we allow it in a converted constant expression. | ||||
5362 | // | ||||
5363 | // FIXME: Per core issue 1407, we should not allow this, but that breaks | ||||
5364 | // a lot of popular code. We should at least add a warning for this | ||||
5365 | // (non-conforming) extension. | ||||
5366 | return SCS.getFromType()->isIntegralOrUnscopedEnumerationType() && | ||||
5367 | SCS.getToType(2)->isBooleanType(); | ||||
5368 | |||||
5369 | case ICK_Pointer_Conversion: | ||||
5370 | case ICK_Pointer_Member: | ||||
5371 | // C++1z: null pointer conversions and null member pointer conversions are | ||||
5372 | // only permitted if the source type is std::nullptr_t. | ||||
5373 | return SCS.getFromType()->isNullPtrType(); | ||||
5374 | |||||
5375 | case ICK_Floating_Promotion: | ||||
5376 | case ICK_Complex_Promotion: | ||||
5377 | case ICK_Floating_Conversion: | ||||
5378 | case ICK_Complex_Conversion: | ||||
5379 | case ICK_Floating_Integral: | ||||
5380 | case ICK_Compatible_Conversion: | ||||
5381 | case ICK_Derived_To_Base: | ||||
5382 | case ICK_Vector_Conversion: | ||||
5383 | case ICK_Vector_Splat: | ||||
5384 | case ICK_Complex_Real: | ||||
5385 | case ICK_Block_Pointer_Conversion: | ||||
5386 | case ICK_TransparentUnionConversion: | ||||
5387 | case ICK_Writeback_Conversion: | ||||
5388 | case ICK_Zero_Event_Conversion: | ||||
5389 | case ICK_C_Only_Conversion: | ||||
5390 | case ICK_Incompatible_Pointer_Conversion: | ||||
5391 | return false; | ||||
5392 | |||||
5393 | case ICK_Lvalue_To_Rvalue: | ||||
5394 | case ICK_Array_To_Pointer: | ||||
5395 | case ICK_Function_To_Pointer: | ||||
5396 | llvm_unreachable("found a first conversion kind in Second")::llvm::llvm_unreachable_internal("found a first conversion kind in Second" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5396); | ||||
5397 | |||||
5398 | case ICK_Qualification: | ||||
5399 | llvm_unreachable("found a third conversion kind in Second")::llvm::llvm_unreachable_internal("found a third conversion kind in Second" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5399); | ||||
5400 | |||||
5401 | case ICK_Num_Conversion_Kinds: | ||||
5402 | break; | ||||
5403 | } | ||||
5404 | |||||
5405 | llvm_unreachable("unknown conversion kind")::llvm::llvm_unreachable_internal("unknown conversion kind", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5405); | ||||
5406 | } | ||||
5407 | |||||
5408 | /// CheckConvertedConstantExpression - Check that the expression From is a | ||||
5409 | /// converted constant expression of type T, perform the conversion and produce | ||||
5410 | /// the converted expression, per C++11 [expr.const]p3. | ||||
5411 | static ExprResult CheckConvertedConstantExpression(Sema &S, Expr *From, | ||||
5412 | QualType T, APValue &Value, | ||||
5413 | Sema::CCEKind CCE, | ||||
5414 | bool RequireInt) { | ||||
5415 | assert(S.getLangOpts().CPlusPlus11 &&((S.getLangOpts().CPlusPlus11 && "converted constant expression outside C++11" ) ? static_cast<void> (0) : __assert_fail ("S.getLangOpts().CPlusPlus11 && \"converted constant expression outside C++11\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5416, __PRETTY_FUNCTION__)) | ||||
5416 | "converted constant expression outside C++11")((S.getLangOpts().CPlusPlus11 && "converted constant expression outside C++11" ) ? static_cast<void> (0) : __assert_fail ("S.getLangOpts().CPlusPlus11 && \"converted constant expression outside C++11\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5416, __PRETTY_FUNCTION__)); | ||||
5417 | |||||
5418 | if (checkPlaceholderForOverload(S, From)) | ||||
5419 | return ExprError(); | ||||
5420 | |||||
5421 | // C++1z [expr.const]p3: | ||||
5422 | // A converted constant expression of type T is an expression, | ||||
5423 | // implicitly converted to type T, where the converted | ||||
5424 | // expression is a constant expression and the implicit conversion | ||||
5425 | // sequence contains only [... list of conversions ...]. | ||||
5426 | // C++1z [stmt.if]p2: | ||||
5427 | // If the if statement is of the form if constexpr, the value of the | ||||
5428 | // condition shall be a contextually converted constant expression of type | ||||
5429 | // bool. | ||||
5430 | ImplicitConversionSequence ICS = | ||||
5431 | CCE == Sema::CCEK_ConstexprIf || CCE == Sema::CCEK_ExplicitBool | ||||
5432 | ? TryContextuallyConvertToBool(S, From) | ||||
5433 | : TryCopyInitialization(S, From, T, | ||||
5434 | /*SuppressUserConversions=*/false, | ||||
5435 | /*InOverloadResolution=*/false, | ||||
5436 | /*AllowObjCWritebackConversion=*/false, | ||||
5437 | /*AllowExplicit=*/false); | ||||
5438 | StandardConversionSequence *SCS = nullptr; | ||||
5439 | switch (ICS.getKind()) { | ||||
5440 | case ImplicitConversionSequence::StandardConversion: | ||||
5441 | SCS = &ICS.Standard; | ||||
5442 | break; | ||||
5443 | case ImplicitConversionSequence::UserDefinedConversion: | ||||
5444 | // We are converting to a non-class type, so the Before sequence | ||||
5445 | // must be trivial. | ||||
5446 | SCS = &ICS.UserDefined.After; | ||||
5447 | break; | ||||
5448 | case ImplicitConversionSequence::AmbiguousConversion: | ||||
5449 | case ImplicitConversionSequence::BadConversion: | ||||
5450 | if (!S.DiagnoseMultipleUserDefinedConversion(From, T)) | ||||
5451 | return S.Diag(From->getBeginLoc(), | ||||
5452 | diag::err_typecheck_converted_constant_expression) | ||||
5453 | << From->getType() << From->getSourceRange() << T; | ||||
5454 | return ExprError(); | ||||
5455 | |||||
5456 | case ImplicitConversionSequence::EllipsisConversion: | ||||
5457 | llvm_unreachable("ellipsis conversion in converted constant expression")::llvm::llvm_unreachable_internal("ellipsis conversion in converted constant expression" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5457); | ||||
5458 | } | ||||
5459 | |||||
5460 | // Check that we would only use permitted conversions. | ||||
5461 | if (!CheckConvertedConstantConversions(S, *SCS)) { | ||||
5462 | return S.Diag(From->getBeginLoc(), | ||||
5463 | diag::err_typecheck_converted_constant_expression_disallowed) | ||||
5464 | << From->getType() << From->getSourceRange() << T; | ||||
5465 | } | ||||
5466 | // [...] and where the reference binding (if any) binds directly. | ||||
5467 | if (SCS->ReferenceBinding && !SCS->DirectBinding) { | ||||
5468 | return S.Diag(From->getBeginLoc(), | ||||
5469 | diag::err_typecheck_converted_constant_expression_indirect) | ||||
5470 | << From->getType() << From->getSourceRange() << T; | ||||
5471 | } | ||||
5472 | |||||
5473 | ExprResult Result = | ||||
5474 | S.PerformImplicitConversion(From, T, ICS, Sema::AA_Converting); | ||||
5475 | if (Result.isInvalid()) | ||||
5476 | return Result; | ||||
5477 | |||||
5478 | // C++2a [intro.execution]p5: | ||||
5479 | // A full-expression is [...] a constant-expression [...] | ||||
5480 | Result = | ||||
5481 | S.ActOnFinishFullExpr(Result.get(), From->getExprLoc(), | ||||
5482 | /*DiscardedValue=*/false, /*IsConstexpr=*/true); | ||||
5483 | if (Result.isInvalid()) | ||||
5484 | return Result; | ||||
5485 | |||||
5486 | // Check for a narrowing implicit conversion. | ||||
5487 | APValue PreNarrowingValue; | ||||
5488 | QualType PreNarrowingType; | ||||
5489 | switch (SCS->getNarrowingKind(S.Context, Result.get(), PreNarrowingValue, | ||||
5490 | PreNarrowingType)) { | ||||
5491 | case NK_Dependent_Narrowing: | ||||
5492 | // Implicit conversion to a narrower type, but the expression is | ||||
5493 | // value-dependent so we can't tell whether it's actually narrowing. | ||||
5494 | case NK_Variable_Narrowing: | ||||
5495 | // Implicit conversion to a narrower type, and the value is not a constant | ||||
5496 | // expression. We'll diagnose this in a moment. | ||||
5497 | case NK_Not_Narrowing: | ||||
5498 | break; | ||||
5499 | |||||
5500 | case NK_Constant_Narrowing: | ||||
5501 | S.Diag(From->getBeginLoc(), diag::ext_cce_narrowing) | ||||
5502 | << CCE << /*Constant*/ 1 | ||||
5503 | << PreNarrowingValue.getAsString(S.Context, PreNarrowingType) << T; | ||||
5504 | break; | ||||
5505 | |||||
5506 | case NK_Type_Narrowing: | ||||
5507 | S.Diag(From->getBeginLoc(), diag::ext_cce_narrowing) | ||||
5508 | << CCE << /*Constant*/ 0 << From->getType() << T; | ||||
5509 | break; | ||||
5510 | } | ||||
5511 | |||||
5512 | if (Result.get()->isValueDependent()) { | ||||
5513 | Value = APValue(); | ||||
5514 | return Result; | ||||
5515 | } | ||||
5516 | |||||
5517 | // Check the expression is a constant expression. | ||||
5518 | SmallVector<PartialDiagnosticAt, 8> Notes; | ||||
5519 | Expr::EvalResult Eval; | ||||
5520 | Eval.Diag = &Notes; | ||||
5521 | Expr::ConstExprUsage Usage = CCE == Sema::CCEK_TemplateArg | ||||
5522 | ? Expr::EvaluateForMangling | ||||
5523 | : Expr::EvaluateForCodeGen; | ||||
5524 | |||||
5525 | if (!Result.get()->EvaluateAsConstantExpr(Eval, Usage, S.Context) || | ||||
5526 | (RequireInt && !Eval.Val.isInt())) { | ||||
5527 | // The expression can't be folded, so we can't keep it at this position in | ||||
5528 | // the AST. | ||||
5529 | Result = ExprError(); | ||||
5530 | } else { | ||||
5531 | Value = Eval.Val; | ||||
5532 | |||||
5533 | if (Notes.empty()) { | ||||
5534 | // It's a constant expression. | ||||
5535 | return ConstantExpr::Create(S.Context, Result.get(), Value); | ||||
5536 | } | ||||
5537 | } | ||||
5538 | |||||
5539 | // It's not a constant expression. Produce an appropriate diagnostic. | ||||
5540 | if (Notes.size() == 1 && | ||||
5541 | Notes[0].second.getDiagID() == diag::note_invalid_subexpr_in_const_expr) | ||||
5542 | S.Diag(Notes[0].first, diag::err_expr_not_cce) << CCE; | ||||
5543 | else { | ||||
5544 | S.Diag(From->getBeginLoc(), diag::err_expr_not_cce) | ||||
5545 | << CCE << From->getSourceRange(); | ||||
5546 | for (unsigned I = 0; I < Notes.size(); ++I) | ||||
5547 | S.Diag(Notes[I].first, Notes[I].second); | ||||
5548 | } | ||||
5549 | return ExprError(); | ||||
5550 | } | ||||
5551 | |||||
5552 | ExprResult Sema::CheckConvertedConstantExpression(Expr *From, QualType T, | ||||
5553 | APValue &Value, CCEKind CCE) { | ||||
5554 | return ::CheckConvertedConstantExpression(*this, From, T, Value, CCE, false); | ||||
5555 | } | ||||
5556 | |||||
5557 | ExprResult Sema::CheckConvertedConstantExpression(Expr *From, QualType T, | ||||
5558 | llvm::APSInt &Value, | ||||
5559 | CCEKind CCE) { | ||||
5560 | assert(T->isIntegralOrEnumerationType() && "unexpected converted const type")((T->isIntegralOrEnumerationType() && "unexpected converted const type" ) ? static_cast<void> (0) : __assert_fail ("T->isIntegralOrEnumerationType() && \"unexpected converted const type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5560, __PRETTY_FUNCTION__)); | ||||
5561 | |||||
5562 | APValue V; | ||||
5563 | auto R = ::CheckConvertedConstantExpression(*this, From, T, V, CCE, true); | ||||
5564 | if (!R.isInvalid() && !R.get()->isValueDependent()) | ||||
5565 | Value = V.getInt(); | ||||
5566 | return R; | ||||
5567 | } | ||||
5568 | |||||
5569 | |||||
5570 | /// dropPointerConversions - If the given standard conversion sequence | ||||
5571 | /// involves any pointer conversions, remove them. This may change | ||||
5572 | /// the result type of the conversion sequence. | ||||
5573 | static void dropPointerConversion(StandardConversionSequence &SCS) { | ||||
5574 | if (SCS.Second == ICK_Pointer_Conversion) { | ||||
5575 | SCS.Second = ICK_Identity; | ||||
5576 | SCS.Third = ICK_Identity; | ||||
5577 | SCS.ToTypePtrs[2] = SCS.ToTypePtrs[1] = SCS.ToTypePtrs[0]; | ||||
5578 | } | ||||
5579 | } | ||||
5580 | |||||
5581 | /// TryContextuallyConvertToObjCPointer - Attempt to contextually | ||||
5582 | /// convert the expression From to an Objective-C pointer type. | ||||
5583 | static ImplicitConversionSequence | ||||
5584 | TryContextuallyConvertToObjCPointer(Sema &S, Expr *From) { | ||||
5585 | // Do an implicit conversion to 'id'. | ||||
5586 | QualType Ty = S.Context.getObjCIdType(); | ||||
5587 | ImplicitConversionSequence ICS | ||||
5588 | = TryImplicitConversion(S, From, Ty, | ||||
5589 | // FIXME: Are these flags correct? | ||||
5590 | /*SuppressUserConversions=*/false, | ||||
5591 | /*AllowExplicit=*/true, | ||||
5592 | /*InOverloadResolution=*/false, | ||||
5593 | /*CStyle=*/false, | ||||
5594 | /*AllowObjCWritebackConversion=*/false, | ||||
5595 | /*AllowObjCConversionOnExplicit=*/true); | ||||
5596 | |||||
5597 | // Strip off any final conversions to 'id'. | ||||
5598 | switch (ICS.getKind()) { | ||||
5599 | case ImplicitConversionSequence::BadConversion: | ||||
5600 | case ImplicitConversionSequence::AmbiguousConversion: | ||||
5601 | case ImplicitConversionSequence::EllipsisConversion: | ||||
5602 | break; | ||||
5603 | |||||
5604 | case ImplicitConversionSequence::UserDefinedConversion: | ||||
5605 | dropPointerConversion(ICS.UserDefined.After); | ||||
5606 | break; | ||||
5607 | |||||
5608 | case ImplicitConversionSequence::StandardConversion: | ||||
5609 | dropPointerConversion(ICS.Standard); | ||||
5610 | break; | ||||
5611 | } | ||||
5612 | |||||
5613 | return ICS; | ||||
5614 | } | ||||
5615 | |||||
5616 | /// PerformContextuallyConvertToObjCPointer - Perform a contextual | ||||
5617 | /// conversion of the expression From to an Objective-C pointer type. | ||||
5618 | /// Returns a valid but null ExprResult if no conversion sequence exists. | ||||
5619 | ExprResult Sema::PerformContextuallyConvertToObjCPointer(Expr *From) { | ||||
5620 | if (checkPlaceholderForOverload(*this, From)) | ||||
5621 | return ExprError(); | ||||
5622 | |||||
5623 | QualType Ty = Context.getObjCIdType(); | ||||
5624 | ImplicitConversionSequence ICS = | ||||
5625 | TryContextuallyConvertToObjCPointer(*this, From); | ||||
5626 | if (!ICS.isBad()) | ||||
5627 | return PerformImplicitConversion(From, Ty, ICS, AA_Converting); | ||||
5628 | return ExprResult(); | ||||
5629 | } | ||||
5630 | |||||
5631 | /// Determine whether the provided type is an integral type, or an enumeration | ||||
5632 | /// type of a permitted flavor. | ||||
5633 | bool Sema::ICEConvertDiagnoser::match(QualType T) { | ||||
5634 | return AllowScopedEnumerations ? T->isIntegralOrEnumerationType() | ||||
5635 | : T->isIntegralOrUnscopedEnumerationType(); | ||||
5636 | } | ||||
5637 | |||||
5638 | static ExprResult | ||||
5639 | diagnoseAmbiguousConversion(Sema &SemaRef, SourceLocation Loc, Expr *From, | ||||
5640 | Sema::ContextualImplicitConverter &Converter, | ||||
5641 | QualType T, UnresolvedSetImpl &ViableConversions) { | ||||
5642 | |||||
5643 | if (Converter.Suppress) | ||||
5644 | return ExprError(); | ||||
5645 | |||||
5646 | Converter.diagnoseAmbiguous(SemaRef, Loc, T) << From->getSourceRange(); | ||||
5647 | for (unsigned I = 0, N = ViableConversions.size(); I != N; ++I) { | ||||
5648 | CXXConversionDecl *Conv = | ||||
5649 | cast<CXXConversionDecl>(ViableConversions[I]->getUnderlyingDecl()); | ||||
5650 | QualType ConvTy = Conv->getConversionType().getNonReferenceType(); | ||||
5651 | Converter.noteAmbiguous(SemaRef, Conv, ConvTy); | ||||
5652 | } | ||||
5653 | return From; | ||||
5654 | } | ||||
5655 | |||||
5656 | static bool | ||||
5657 | diagnoseNoViableConversion(Sema &SemaRef, SourceLocation Loc, Expr *&From, | ||||
5658 | Sema::ContextualImplicitConverter &Converter, | ||||
5659 | QualType T, bool HadMultipleCandidates, | ||||
5660 | UnresolvedSetImpl &ExplicitConversions) { | ||||
5661 | if (ExplicitConversions.size() == 1 && !Converter.Suppress) { | ||||
5662 | DeclAccessPair Found = ExplicitConversions[0]; | ||||
5663 | CXXConversionDecl *Conversion = | ||||
5664 | cast<CXXConversionDecl>(Found->getUnderlyingDecl()); | ||||
5665 | |||||
5666 | // The user probably meant to invoke the given explicit | ||||
5667 | // conversion; use it. | ||||
5668 | QualType ConvTy = Conversion->getConversionType().getNonReferenceType(); | ||||
5669 | std::string TypeStr; | ||||
5670 | ConvTy.getAsStringInternal(TypeStr, SemaRef.getPrintingPolicy()); | ||||
5671 | |||||
5672 | Converter.diagnoseExplicitConv(SemaRef, Loc, T, ConvTy) | ||||
5673 | << FixItHint::CreateInsertion(From->getBeginLoc(), | ||||
5674 | "static_cast<" + TypeStr + ">(") | ||||
5675 | << FixItHint::CreateInsertion( | ||||
5676 | SemaRef.getLocForEndOfToken(From->getEndLoc()), ")"); | ||||
5677 | Converter.noteExplicitConv(SemaRef, Conversion, ConvTy); | ||||
5678 | |||||
5679 | // If we aren't in a SFINAE context, build a call to the | ||||
5680 | // explicit conversion function. | ||||
5681 | if (SemaRef.isSFINAEContext()) | ||||
5682 | return true; | ||||
5683 | |||||
5684 | SemaRef.CheckMemberOperatorAccess(From->getExprLoc(), From, nullptr, Found); | ||||
5685 | ExprResult Result = SemaRef.BuildCXXMemberCallExpr(From, Found, Conversion, | ||||
5686 | HadMultipleCandidates); | ||||
5687 | if (Result.isInvalid()) | ||||
5688 | return true; | ||||
5689 | // Record usage of conversion in an implicit cast. | ||||
5690 | From = ImplicitCastExpr::Create(SemaRef.Context, Result.get()->getType(), | ||||
5691 | CK_UserDefinedConversion, Result.get(), | ||||
5692 | nullptr, Result.get()->getValueKind()); | ||||
5693 | } | ||||
5694 | return false; | ||||
5695 | } | ||||
5696 | |||||
5697 | static bool recordConversion(Sema &SemaRef, SourceLocation Loc, Expr *&From, | ||||
5698 | Sema::ContextualImplicitConverter &Converter, | ||||
5699 | QualType T, bool HadMultipleCandidates, | ||||
5700 | DeclAccessPair &Found) { | ||||
5701 | CXXConversionDecl *Conversion = | ||||
5702 | cast<CXXConversionDecl>(Found->getUnderlyingDecl()); | ||||
5703 | SemaRef.CheckMemberOperatorAccess(From->getExprLoc(), From, nullptr, Found); | ||||
5704 | |||||
5705 | QualType ToType = Conversion->getConversionType().getNonReferenceType(); | ||||
5706 | if (!Converter.SuppressConversion) { | ||||
5707 | if (SemaRef.isSFINAEContext()) | ||||
5708 | return true; | ||||
5709 | |||||
5710 | Converter.diagnoseConversion(SemaRef, Loc, T, ToType) | ||||
5711 | << From->getSourceRange(); | ||||
5712 | } | ||||
5713 | |||||
5714 | ExprResult Result = SemaRef.BuildCXXMemberCallExpr(From, Found, Conversion, | ||||
5715 | HadMultipleCandidates); | ||||
5716 | if (Result.isInvalid()) | ||||
5717 | return true; | ||||
5718 | // Record usage of conversion in an implicit cast. | ||||
5719 | From = ImplicitCastExpr::Create(SemaRef.Context, Result.get()->getType(), | ||||
5720 | CK_UserDefinedConversion, Result.get(), | ||||
5721 | nullptr, Result.get()->getValueKind()); | ||||
5722 | return false; | ||||
5723 | } | ||||
5724 | |||||
5725 | static ExprResult finishContextualImplicitConversion( | ||||
5726 | Sema &SemaRef, SourceLocation Loc, Expr *From, | ||||
5727 | Sema::ContextualImplicitConverter &Converter) { | ||||
5728 | if (!Converter.match(From->getType()) && !Converter.Suppress) | ||||
5729 | Converter.diagnoseNoMatch(SemaRef, Loc, From->getType()) | ||||
5730 | << From->getSourceRange(); | ||||
5731 | |||||
5732 | return SemaRef.DefaultLvalueConversion(From); | ||||
5733 | } | ||||
5734 | |||||
5735 | static void | ||||
5736 | collectViableConversionCandidates(Sema &SemaRef, Expr *From, QualType ToType, | ||||
5737 | UnresolvedSetImpl &ViableConversions, | ||||
5738 | OverloadCandidateSet &CandidateSet) { | ||||
5739 | for (unsigned I = 0, N = ViableConversions.size(); I != N; ++I) { | ||||
5740 | DeclAccessPair FoundDecl = ViableConversions[I]; | ||||
5741 | NamedDecl *D = FoundDecl.getDecl(); | ||||
5742 | CXXRecordDecl *ActingContext = cast<CXXRecordDecl>(D->getDeclContext()); | ||||
5743 | if (isa<UsingShadowDecl>(D)) | ||||
5744 | D = cast<UsingShadowDecl>(D)->getTargetDecl(); | ||||
5745 | |||||
5746 | CXXConversionDecl *Conv; | ||||
5747 | FunctionTemplateDecl *ConvTemplate; | ||||
5748 | if ((ConvTemplate = dyn_cast<FunctionTemplateDecl>(D))) | ||||
5749 | Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); | ||||
5750 | else | ||||
5751 | Conv = cast<CXXConversionDecl>(D); | ||||
5752 | |||||
5753 | if (ConvTemplate) | ||||
5754 | SemaRef.AddTemplateConversionCandidate( | ||||
5755 | ConvTemplate, FoundDecl, ActingContext, From, ToType, CandidateSet, | ||||
5756 | /*AllowObjCConversionOnExplicit=*/false, /*AllowExplicit*/ true); | ||||
5757 | else | ||||
5758 | SemaRef.AddConversionCandidate(Conv, FoundDecl, ActingContext, From, | ||||
5759 | ToType, CandidateSet, | ||||
5760 | /*AllowObjCConversionOnExplicit=*/false, | ||||
5761 | /*AllowExplicit*/ true); | ||||
5762 | } | ||||
5763 | } | ||||
5764 | |||||
5765 | /// Attempt to convert the given expression to a type which is accepted | ||||
5766 | /// by the given converter. | ||||
5767 | /// | ||||
5768 | /// This routine will attempt to convert an expression of class type to a | ||||
5769 | /// type accepted by the specified converter. In C++11 and before, the class | ||||
5770 | /// must have a single non-explicit conversion function converting to a matching | ||||
5771 | /// type. In C++1y, there can be multiple such conversion functions, but only | ||||
5772 | /// one target type. | ||||
5773 | /// | ||||
5774 | /// \param Loc The source location of the construct that requires the | ||||
5775 | /// conversion. | ||||
5776 | /// | ||||
5777 | /// \param From The expression we're converting from. | ||||
5778 | /// | ||||
5779 | /// \param Converter Used to control and diagnose the conversion process. | ||||
5780 | /// | ||||
5781 | /// \returns The expression, converted to an integral or enumeration type if | ||||
5782 | /// successful. | ||||
5783 | ExprResult Sema::PerformContextualImplicitConversion( | ||||
5784 | SourceLocation Loc, Expr *From, ContextualImplicitConverter &Converter) { | ||||
5785 | // We can't perform any more checking for type-dependent expressions. | ||||
5786 | if (From->isTypeDependent()) | ||||
5787 | return From; | ||||
5788 | |||||
5789 | // Process placeholders immediately. | ||||
5790 | if (From->hasPlaceholderType()) { | ||||
5791 | ExprResult result = CheckPlaceholderExpr(From); | ||||
5792 | if (result.isInvalid()) | ||||
5793 | return result; | ||||
5794 | From = result.get(); | ||||
5795 | } | ||||
5796 | |||||
5797 | // If the expression already has a matching type, we're golden. | ||||
5798 | QualType T = From->getType(); | ||||
5799 | if (Converter.match(T)) | ||||
5800 | return DefaultLvalueConversion(From); | ||||
5801 | |||||
5802 | // FIXME: Check for missing '()' if T is a function type? | ||||
5803 | |||||
5804 | // We can only perform contextual implicit conversions on objects of class | ||||
5805 | // type. | ||||
5806 | const RecordType *RecordTy = T->getAs<RecordType>(); | ||||
5807 | if (!RecordTy || !getLangOpts().CPlusPlus) { | ||||
5808 | if (!Converter.Suppress) | ||||
5809 | Converter.diagnoseNoMatch(*this, Loc, T) << From->getSourceRange(); | ||||
5810 | return From; | ||||
5811 | } | ||||
5812 | |||||
5813 | // We must have a complete class type. | ||||
5814 | struct TypeDiagnoserPartialDiag : TypeDiagnoser { | ||||
5815 | ContextualImplicitConverter &Converter; | ||||
5816 | Expr *From; | ||||
5817 | |||||
5818 | TypeDiagnoserPartialDiag(ContextualImplicitConverter &Converter, Expr *From) | ||||
5819 | : Converter(Converter), From(From) {} | ||||
5820 | |||||
5821 | void diagnose(Sema &S, SourceLocation Loc, QualType T) override { | ||||
5822 | Converter.diagnoseIncomplete(S, Loc, T) << From->getSourceRange(); | ||||
5823 | } | ||||
5824 | } IncompleteDiagnoser(Converter, From); | ||||
5825 | |||||
5826 | if (Converter.Suppress ? !isCompleteType(Loc, T) | ||||
5827 | : RequireCompleteType(Loc, T, IncompleteDiagnoser)) | ||||
5828 | return From; | ||||
5829 | |||||
5830 | // Look for a conversion to an integral or enumeration type. | ||||
5831 | UnresolvedSet<4> | ||||
5832 | ViableConversions; // These are *potentially* viable in C++1y. | ||||
5833 | UnresolvedSet<4> ExplicitConversions; | ||||
5834 | const auto &Conversions = | ||||
5835 | cast<CXXRecordDecl>(RecordTy->getDecl())->getVisibleConversionFunctions(); | ||||
5836 | |||||
5837 | bool HadMultipleCandidates = | ||||
5838 | (std::distance(Conversions.begin(), Conversions.end()) > 1); | ||||
5839 | |||||
5840 | // To check that there is only one target type, in C++1y: | ||||
5841 | QualType ToType; | ||||
5842 | bool HasUniqueTargetType = true; | ||||
5843 | |||||
5844 | // Collect explicit or viable (potentially in C++1y) conversions. | ||||
5845 | for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) { | ||||
5846 | NamedDecl *D = (*I)->getUnderlyingDecl(); | ||||
5847 | CXXConversionDecl *Conversion; | ||||
5848 | FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D); | ||||
5849 | if (ConvTemplate) { | ||||
5850 | if (getLangOpts().CPlusPlus14) | ||||
5851 | Conversion = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); | ||||
5852 | else | ||||
5853 | continue; // C++11 does not consider conversion operator templates(?). | ||||
5854 | } else | ||||
5855 | Conversion = cast<CXXConversionDecl>(D); | ||||
5856 | |||||
5857 | assert((!ConvTemplate || getLangOpts().CPlusPlus14) &&(((!ConvTemplate || getLangOpts().CPlusPlus14) && "Conversion operator templates are considered potentially " "viable in C++1y") ? static_cast<void> (0) : __assert_fail ("(!ConvTemplate || getLangOpts().CPlusPlus14) && \"Conversion operator templates are considered potentially \" \"viable in C++1y\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5859, __PRETTY_FUNCTION__)) | ||||
5858 | "Conversion operator templates are considered potentially "(((!ConvTemplate || getLangOpts().CPlusPlus14) && "Conversion operator templates are considered potentially " "viable in C++1y") ? static_cast<void> (0) : __assert_fail ("(!ConvTemplate || getLangOpts().CPlusPlus14) && \"Conversion operator templates are considered potentially \" \"viable in C++1y\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5859, __PRETTY_FUNCTION__)) | ||||
5859 | "viable in C++1y")(((!ConvTemplate || getLangOpts().CPlusPlus14) && "Conversion operator templates are considered potentially " "viable in C++1y") ? static_cast<void> (0) : __assert_fail ("(!ConvTemplate || getLangOpts().CPlusPlus14) && \"Conversion operator templates are considered potentially \" \"viable in C++1y\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 5859, __PRETTY_FUNCTION__)); | ||||
5860 | |||||
5861 | QualType CurToType = Conversion->getConversionType().getNonReferenceType(); | ||||
5862 | if (Converter.match(CurToType) || ConvTemplate) { | ||||
5863 | |||||
5864 | if (Conversion->isExplicit()) { | ||||
5865 | // FIXME: For C++1y, do we need this restriction? | ||||
5866 | // cf. diagnoseNoViableConversion() | ||||
5867 | if (!ConvTemplate) | ||||
5868 | ExplicitConversions.addDecl(I.getDecl(), I.getAccess()); | ||||
5869 | } else { | ||||
5870 | if (!ConvTemplate && getLangOpts().CPlusPlus14) { | ||||
5871 | if (ToType.isNull()) | ||||
5872 | ToType = CurToType.getUnqualifiedType(); | ||||
5873 | else if (HasUniqueTargetType && | ||||
5874 | (CurToType.getUnqualifiedType() != ToType)) | ||||
5875 | HasUniqueTargetType = false; | ||||
5876 | } | ||||
5877 | ViableConversions.addDecl(I.getDecl(), I.getAccess()); | ||||
5878 | } | ||||
5879 | } | ||||
5880 | } | ||||
5881 | |||||
5882 | if (getLangOpts().CPlusPlus14) { | ||||
5883 | // C++1y [conv]p6: | ||||
5884 | // ... An expression e of class type E appearing in such a context | ||||
5885 | // is said to be contextually implicitly converted to a specified | ||||
5886 | // type T and is well-formed if and only if e can be implicitly | ||||
5887 | // converted to a type T that is determined as follows: E is searched | ||||
5888 | // for conversion functions whose return type is cv T or reference to | ||||
5889 | // cv T such that T is allowed by the context. There shall be | ||||
5890 | // exactly one such T. | ||||
5891 | |||||
5892 | // If no unique T is found: | ||||
5893 | if (ToType.isNull()) { | ||||
5894 | if (diagnoseNoViableConversion(*this, Loc, From, Converter, T, | ||||
5895 | HadMultipleCandidates, | ||||
5896 | ExplicitConversions)) | ||||
5897 | return ExprError(); | ||||
5898 | return finishContextualImplicitConversion(*this, Loc, From, Converter); | ||||
5899 | } | ||||
5900 | |||||
5901 | // If more than one unique Ts are found: | ||||
5902 | if (!HasUniqueTargetType) | ||||
5903 | return diagnoseAmbiguousConversion(*this, Loc, From, Converter, T, | ||||
5904 | ViableConversions); | ||||
5905 | |||||
5906 | // If one unique T is found: | ||||
5907 | // First, build a candidate set from the previously recorded | ||||
5908 | // potentially viable conversions. | ||||
5909 | OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal); | ||||
5910 | collectViableConversionCandidates(*this, From, ToType, ViableConversions, | ||||
5911 | CandidateSet); | ||||
5912 | |||||
5913 | // Then, perform overload resolution over the candidate set. | ||||
5914 | OverloadCandidateSet::iterator Best; | ||||
5915 | switch (CandidateSet.BestViableFunction(*this, Loc, Best)) { | ||||
5916 | case OR_Success: { | ||||
5917 | // Apply this conversion. | ||||
5918 | DeclAccessPair Found = | ||||
5919 | DeclAccessPair::make(Best->Function, Best->FoundDecl.getAccess()); | ||||
5920 | if (recordConversion(*this, Loc, From, Converter, T, | ||||
5921 | HadMultipleCandidates, Found)) | ||||
5922 | return ExprError(); | ||||
5923 | break; | ||||
5924 | } | ||||
5925 | case OR_Ambiguous: | ||||
5926 | return diagnoseAmbiguousConversion(*this, Loc, From, Converter, T, | ||||
5927 | ViableConversions); | ||||
5928 | case OR_No_Viable_Function: | ||||
5929 | if (diagnoseNoViableConversion(*this, Loc, From, Converter, T, | ||||
5930 | HadMultipleCandidates, | ||||
5931 | ExplicitConversions)) | ||||
5932 | return ExprError(); | ||||
5933 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||
5934 | case OR_Deleted: | ||||
5935 | // We'll complain below about a non-integral condition type. | ||||
5936 | break; | ||||
5937 | } | ||||
5938 | } else { | ||||
5939 | switch (ViableConversions.size()) { | ||||
5940 | case 0: { | ||||
5941 | if (diagnoseNoViableConversion(*this, Loc, From, Converter, T, | ||||
5942 | HadMultipleCandidates, | ||||
5943 | ExplicitConversions)) | ||||
5944 | return ExprError(); | ||||
5945 | |||||
5946 | // We'll complain below about a non-integral condition type. | ||||
5947 | break; | ||||
5948 | } | ||||
5949 | case 1: { | ||||
5950 | // Apply this conversion. | ||||
5951 | DeclAccessPair Found = ViableConversions[0]; | ||||
5952 | if (recordConversion(*this, Loc, From, Converter, T, | ||||
5953 | HadMultipleCandidates, Found)) | ||||
5954 | return ExprError(); | ||||
5955 | break; | ||||
5956 | } | ||||
5957 | default: | ||||
5958 | return diagnoseAmbiguousConversion(*this, Loc, From, Converter, T, | ||||
5959 | ViableConversions); | ||||
5960 | } | ||||
5961 | } | ||||
5962 | |||||
5963 | return finishContextualImplicitConversion(*this, Loc, From, Converter); | ||||
5964 | } | ||||
5965 | |||||
5966 | /// IsAcceptableNonMemberOperatorCandidate - Determine whether Fn is | ||||
5967 | /// an acceptable non-member overloaded operator for a call whose | ||||
5968 | /// arguments have types T1 (and, if non-empty, T2). This routine | ||||
5969 | /// implements the check in C++ [over.match.oper]p3b2 concerning | ||||
5970 | /// enumeration types. | ||||
5971 | static bool IsAcceptableNonMemberOperatorCandidate(ASTContext &Context, | ||||
5972 | FunctionDecl *Fn, | ||||
5973 | ArrayRef<Expr *> Args) { | ||||
5974 | QualType T1 = Args[0]->getType(); | ||||
5975 | QualType T2 = Args.size() > 1 ? Args[1]->getType() : QualType(); | ||||
5976 | |||||
5977 | if (T1->isDependentType() || (!T2.isNull() && T2->isDependentType())) | ||||
5978 | return true; | ||||
5979 | |||||
5980 | if (T1->isRecordType() || (!T2.isNull() && T2->isRecordType())) | ||||
5981 | return true; | ||||
5982 | |||||
5983 | const FunctionProtoType *Proto = Fn->getType()->getAs<FunctionProtoType>(); | ||||
5984 | if (Proto->getNumParams() < 1) | ||||
5985 | return false; | ||||
5986 | |||||
5987 | if (T1->isEnumeralType()) { | ||||
5988 | QualType ArgType = Proto->getParamType(0).getNonReferenceType(); | ||||
5989 | if (Context.hasSameUnqualifiedType(T1, ArgType)) | ||||
5990 | return true; | ||||
5991 | } | ||||
5992 | |||||
5993 | if (Proto->getNumParams() < 2) | ||||
5994 | return false; | ||||
5995 | |||||
5996 | if (!T2.isNull() && T2->isEnumeralType()) { | ||||
5997 | QualType ArgType = Proto->getParamType(1).getNonReferenceType(); | ||||
5998 | if (Context.hasSameUnqualifiedType(T2, ArgType)) | ||||
5999 | return true; | ||||
6000 | } | ||||
6001 | |||||
6002 | return false; | ||||
6003 | } | ||||
6004 | |||||
6005 | /// AddOverloadCandidate - Adds the given function to the set of | ||||
6006 | /// candidate functions, using the given function call arguments. If | ||||
6007 | /// @p SuppressUserConversions, then don't allow user-defined | ||||
6008 | /// conversions via constructors or conversion operators. | ||||
6009 | /// | ||||
6010 | /// \param PartialOverloading true if we are performing "partial" overloading | ||||
6011 | /// based on an incomplete set of function arguments. This feature is used by | ||||
6012 | /// code completion. | ||||
6013 | void Sema::AddOverloadCandidate( | ||||
6014 | FunctionDecl *Function, DeclAccessPair FoundDecl, ArrayRef<Expr *> Args, | ||||
6015 | OverloadCandidateSet &CandidateSet, bool SuppressUserConversions, | ||||
6016 | bool PartialOverloading, bool AllowExplicit, bool AllowExplicitConversions, | ||||
6017 | ADLCallKind IsADLCandidate, ConversionSequenceList EarlyConversions) { | ||||
6018 | const FunctionProtoType *Proto | ||||
6019 | = dyn_cast<FunctionProtoType>(Function->getType()->getAs<FunctionType>()); | ||||
6020 | assert(Proto && "Functions without a prototype cannot be overloaded")((Proto && "Functions without a prototype cannot be overloaded" ) ? static_cast<void> (0) : __assert_fail ("Proto && \"Functions without a prototype cannot be overloaded\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6020, __PRETTY_FUNCTION__)); | ||||
6021 | assert(!Function->getDescribedFunctionTemplate() &&((!Function->getDescribedFunctionTemplate() && "Use AddTemplateOverloadCandidate for function templates" ) ? static_cast<void> (0) : __assert_fail ("!Function->getDescribedFunctionTemplate() && \"Use AddTemplateOverloadCandidate for function templates\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6022, __PRETTY_FUNCTION__)) | ||||
6022 | "Use AddTemplateOverloadCandidate for function templates")((!Function->getDescribedFunctionTemplate() && "Use AddTemplateOverloadCandidate for function templates" ) ? static_cast<void> (0) : __assert_fail ("!Function->getDescribedFunctionTemplate() && \"Use AddTemplateOverloadCandidate for function templates\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6022, __PRETTY_FUNCTION__)); | ||||
6023 | |||||
6024 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Function)) { | ||||
6025 | if (!isa<CXXConstructorDecl>(Method)) { | ||||
6026 | // If we get here, it's because we're calling a member function | ||||
6027 | // that is named without a member access expression (e.g., | ||||
6028 | // "this->f") that was either written explicitly or created | ||||
6029 | // implicitly. This can happen with a qualified call to a member | ||||
6030 | // function, e.g., X::f(). We use an empty type for the implied | ||||
6031 | // object argument (C++ [over.call.func]p3), and the acting context | ||||
6032 | // is irrelevant. | ||||
6033 | AddMethodCandidate(Method, FoundDecl, Method->getParent(), QualType(), | ||||
6034 | Expr::Classification::makeSimpleLValue(), Args, | ||||
6035 | CandidateSet, SuppressUserConversions, | ||||
6036 | PartialOverloading, EarlyConversions); | ||||
6037 | return; | ||||
6038 | } | ||||
6039 | // We treat a constructor like a non-member function, since its object | ||||
6040 | // argument doesn't participate in overload resolution. | ||||
6041 | } | ||||
6042 | |||||
6043 | if (!CandidateSet.isNewCandidate(Function)) | ||||
6044 | return; | ||||
6045 | |||||
6046 | // C++ [over.match.oper]p3: | ||||
6047 | // if no operand has a class type, only those non-member functions in the | ||||
6048 | // lookup set that have a first parameter of type T1 or "reference to | ||||
6049 | // (possibly cv-qualified) T1", when T1 is an enumeration type, or (if there | ||||
6050 | // is a right operand) a second parameter of type T2 or "reference to | ||||
6051 | // (possibly cv-qualified) T2", when T2 is an enumeration type, are | ||||
6052 | // candidate functions. | ||||
6053 | if (CandidateSet.getKind() == OverloadCandidateSet::CSK_Operator && | ||||
6054 | !IsAcceptableNonMemberOperatorCandidate(Context, Function, Args)) | ||||
6055 | return; | ||||
6056 | |||||
6057 | // C++11 [class.copy]p11: [DR1402] | ||||
6058 | // A defaulted move constructor that is defined as deleted is ignored by | ||||
6059 | // overload resolution. | ||||
6060 | CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Function); | ||||
6061 | if (Constructor && Constructor->isDefaulted() && Constructor->isDeleted() && | ||||
6062 | Constructor->isMoveConstructor()) | ||||
6063 | return; | ||||
6064 | |||||
6065 | // Overload resolution is always an unevaluated context. | ||||
6066 | EnterExpressionEvaluationContext Unevaluated( | ||||
6067 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | ||||
6068 | |||||
6069 | // Add this candidate | ||||
6070 | OverloadCandidate &Candidate = | ||||
6071 | CandidateSet.addCandidate(Args.size(), EarlyConversions); | ||||
6072 | Candidate.FoundDecl = FoundDecl; | ||||
6073 | Candidate.Function = Function; | ||||
6074 | Candidate.Viable = true; | ||||
6075 | Candidate.IsSurrogate = false; | ||||
6076 | Candidate.IsADLCandidate = IsADLCandidate; | ||||
6077 | Candidate.IgnoreObjectArgument = false; | ||||
6078 | Candidate.ExplicitCallArguments = Args.size(); | ||||
6079 | |||||
6080 | if (Function->isMultiVersion() && Function->hasAttr<TargetAttr>() && | ||||
6081 | !Function->getAttr<TargetAttr>()->isDefaultVersion()) { | ||||
6082 | Candidate.Viable = false; | ||||
6083 | Candidate.FailureKind = ovl_non_default_multiversion_function; | ||||
6084 | return; | ||||
6085 | } | ||||
6086 | |||||
6087 | if (Constructor) { | ||||
6088 | // C++ [class.copy]p3: | ||||
6089 | // A member function template is never instantiated to perform the copy | ||||
6090 | // of a class object to an object of its class type. | ||||
6091 | QualType ClassType = Context.getTypeDeclType(Constructor->getParent()); | ||||
6092 | if (Args.size() == 1 && Constructor->isSpecializationCopyingObject() && | ||||
6093 | (Context.hasSameUnqualifiedType(ClassType, Args[0]->getType()) || | ||||
6094 | IsDerivedFrom(Args[0]->getBeginLoc(), Args[0]->getType(), | ||||
6095 | ClassType))) { | ||||
6096 | Candidate.Viable = false; | ||||
6097 | Candidate.FailureKind = ovl_fail_illegal_constructor; | ||||
6098 | return; | ||||
6099 | } | ||||
6100 | |||||
6101 | // C++ [over.match.funcs]p8: (proposed DR resolution) | ||||
6102 | // A constructor inherited from class type C that has a first parameter | ||||
6103 | // of type "reference to P" (including such a constructor instantiated | ||||
6104 | // from a template) is excluded from the set of candidate functions when | ||||
6105 | // constructing an object of type cv D if the argument list has exactly | ||||
6106 | // one argument and D is reference-related to P and P is reference-related | ||||
6107 | // to C. | ||||
6108 | auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl.getDecl()); | ||||
6109 | if (Shadow && Args.size() == 1 && Constructor->getNumParams() >= 1 && | ||||
6110 | Constructor->getParamDecl(0)->getType()->isReferenceType()) { | ||||
6111 | QualType P = Constructor->getParamDecl(0)->getType()->getPointeeType(); | ||||
6112 | QualType C = Context.getRecordType(Constructor->getParent()); | ||||
6113 | QualType D = Context.getRecordType(Shadow->getParent()); | ||||
6114 | SourceLocation Loc = Args.front()->getExprLoc(); | ||||
6115 | if ((Context.hasSameUnqualifiedType(P, C) || IsDerivedFrom(Loc, P, C)) && | ||||
6116 | (Context.hasSameUnqualifiedType(D, P) || IsDerivedFrom(Loc, D, P))) { | ||||
6117 | Candidate.Viable = false; | ||||
6118 | Candidate.FailureKind = ovl_fail_inhctor_slice; | ||||
6119 | return; | ||||
6120 | } | ||||
6121 | } | ||||
6122 | |||||
6123 | // Check that the constructor is capable of constructing an object in the | ||||
6124 | // destination address space. | ||||
6125 | if (!Qualifiers::isAddressSpaceSupersetOf( | ||||
6126 | Constructor->getMethodQualifiers().getAddressSpace(), | ||||
6127 | CandidateSet.getDestAS())) { | ||||
6128 | Candidate.Viable = false; | ||||
6129 | Candidate.FailureKind = ovl_fail_object_addrspace_mismatch; | ||||
6130 | } | ||||
6131 | } | ||||
6132 | |||||
6133 | unsigned NumParams = Proto->getNumParams(); | ||||
6134 | |||||
6135 | // (C++ 13.3.2p2): A candidate function having fewer than m | ||||
6136 | // parameters is viable only if it has an ellipsis in its parameter | ||||
6137 | // list (8.3.5). | ||||
6138 | if (TooManyArguments(NumParams, Args.size(), PartialOverloading) && | ||||
6139 | !Proto->isVariadic()) { | ||||
6140 | Candidate.Viable = false; | ||||
6141 | Candidate.FailureKind = ovl_fail_too_many_arguments; | ||||
6142 | return; | ||||
6143 | } | ||||
6144 | |||||
6145 | // (C++ 13.3.2p2): A candidate function having more than m parameters | ||||
6146 | // is viable only if the (m+1)st parameter has a default argument | ||||
6147 | // (8.3.6). For the purposes of overload resolution, the | ||||
6148 | // parameter list is truncated on the right, so that there are | ||||
6149 | // exactly m parameters. | ||||
6150 | unsigned MinRequiredArgs = Function->getMinRequiredArguments(); | ||||
6151 | if (Args.size() < MinRequiredArgs && !PartialOverloading) { | ||||
6152 | // Not enough arguments. | ||||
6153 | Candidate.Viable = false; | ||||
6154 | Candidate.FailureKind = ovl_fail_too_few_arguments; | ||||
6155 | return; | ||||
6156 | } | ||||
6157 | |||||
6158 | // (CUDA B.1): Check for invalid calls between targets. | ||||
6159 | if (getLangOpts().CUDA) | ||||
6160 | if (const FunctionDecl *Caller = dyn_cast<FunctionDecl>(CurContext)) | ||||
6161 | // Skip the check for callers that are implicit members, because in this | ||||
6162 | // case we may not yet know what the member's target is; the target is | ||||
6163 | // inferred for the member automatically, based on the bases and fields of | ||||
6164 | // the class. | ||||
6165 | if (!Caller->isImplicit() && !IsAllowedCUDACall(Caller, Function)) { | ||||
6166 | Candidate.Viable = false; | ||||
6167 | Candidate.FailureKind = ovl_fail_bad_target; | ||||
6168 | return; | ||||
6169 | } | ||||
6170 | |||||
6171 | // Determine the implicit conversion sequences for each of the | ||||
6172 | // arguments. | ||||
6173 | for (unsigned ArgIdx = 0; ArgIdx < Args.size(); ++ArgIdx) { | ||||
6174 | if (Candidate.Conversions[ArgIdx].isInitialized()) { | ||||
6175 | // We already formed a conversion sequence for this parameter during | ||||
6176 | // template argument deduction. | ||||
6177 | } else if (ArgIdx < NumParams) { | ||||
6178 | // (C++ 13.3.2p3): for F to be a viable function, there shall | ||||
6179 | // exist for each argument an implicit conversion sequence | ||||
6180 | // (13.3.3.1) that converts that argument to the corresponding | ||||
6181 | // parameter of F. | ||||
6182 | QualType ParamType = Proto->getParamType(ArgIdx); | ||||
6183 | Candidate.Conversions[ArgIdx] = TryCopyInitialization( | ||||
6184 | *this, Args[ArgIdx], ParamType, SuppressUserConversions, | ||||
6185 | /*InOverloadResolution=*/true, | ||||
6186 | /*AllowObjCWritebackConversion=*/ | ||||
6187 | getLangOpts().ObjCAutoRefCount, AllowExplicitConversions); | ||||
6188 | if (Candidate.Conversions[ArgIdx].isBad()) { | ||||
6189 | Candidate.Viable = false; | ||||
6190 | Candidate.FailureKind = ovl_fail_bad_conversion; | ||||
6191 | return; | ||||
6192 | } | ||||
6193 | } else { | ||||
6194 | // (C++ 13.3.2p2): For the purposes of overload resolution, any | ||||
6195 | // argument for which there is no corresponding parameter is | ||||
6196 | // considered to ""match the ellipsis" (C+ 13.3.3.1.3). | ||||
6197 | Candidate.Conversions[ArgIdx].setEllipsis(); | ||||
6198 | } | ||||
6199 | } | ||||
6200 | |||||
6201 | if (!AllowExplicit) { | ||||
6202 | ExplicitSpecifier ES = ExplicitSpecifier::getFromDecl(Function); | ||||
6203 | if (ES.getKind() != ExplicitSpecKind::ResolvedFalse) { | ||||
6204 | Candidate.Viable = false; | ||||
6205 | Candidate.FailureKind = ovl_fail_explicit_resolved; | ||||
6206 | return; | ||||
6207 | } | ||||
6208 | } | ||||
6209 | |||||
6210 | if (EnableIfAttr *FailedAttr = CheckEnableIf(Function, Args)) { | ||||
6211 | Candidate.Viable = false; | ||||
6212 | Candidate.FailureKind = ovl_fail_enable_if; | ||||
6213 | Candidate.DeductionFailure.Data = FailedAttr; | ||||
6214 | return; | ||||
6215 | } | ||||
6216 | |||||
6217 | if (LangOpts.OpenCL && isOpenCLDisabledDecl(Function)) { | ||||
6218 | Candidate.Viable = false; | ||||
6219 | Candidate.FailureKind = ovl_fail_ext_disabled; | ||||
6220 | return; | ||||
6221 | } | ||||
6222 | } | ||||
6223 | |||||
6224 | ObjCMethodDecl * | ||||
6225 | Sema::SelectBestMethod(Selector Sel, MultiExprArg Args, bool IsInstance, | ||||
6226 | SmallVectorImpl<ObjCMethodDecl *> &Methods) { | ||||
6227 | if (Methods.size() <= 1) | ||||
6228 | return nullptr; | ||||
6229 | |||||
6230 | for (unsigned b = 0, e = Methods.size(); b < e; b++) { | ||||
6231 | bool Match = true; | ||||
6232 | ObjCMethodDecl *Method = Methods[b]; | ||||
6233 | unsigned NumNamedArgs = Sel.getNumArgs(); | ||||
6234 | // Method might have more arguments than selector indicates. This is due | ||||
6235 | // to addition of c-style arguments in method. | ||||
6236 | if (Method->param_size() > NumNamedArgs) | ||||
6237 | NumNamedArgs = Method->param_size(); | ||||
6238 | if (Args.size() < NumNamedArgs) | ||||
6239 | continue; | ||||
6240 | |||||
6241 | for (unsigned i = 0; i < NumNamedArgs; i++) { | ||||
6242 | // We can't do any type-checking on a type-dependent argument. | ||||
6243 | if (Args[i]->isTypeDependent()) { | ||||
6244 | Match = false; | ||||
6245 | break; | ||||
6246 | } | ||||
6247 | |||||
6248 | ParmVarDecl *param = Method->parameters()[i]; | ||||
6249 | Expr *argExpr = Args[i]; | ||||
6250 | assert(argExpr && "SelectBestMethod(): missing expression")((argExpr && "SelectBestMethod(): missing expression" ) ? static_cast<void> (0) : __assert_fail ("argExpr && \"SelectBestMethod(): missing expression\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6250, __PRETTY_FUNCTION__)); | ||||
6251 | |||||
6252 | // Strip the unbridged-cast placeholder expression off unless it's | ||||
6253 | // a consumed argument. | ||||
6254 | if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) && | ||||
6255 | !param->hasAttr<CFConsumedAttr>()) | ||||
6256 | argExpr = stripARCUnbridgedCast(argExpr); | ||||
6257 | |||||
6258 | // If the parameter is __unknown_anytype, move on to the next method. | ||||
6259 | if (param->getType() == Context.UnknownAnyTy) { | ||||
6260 | Match = false; | ||||
6261 | break; | ||||
6262 | } | ||||
6263 | |||||
6264 | ImplicitConversionSequence ConversionState | ||||
6265 | = TryCopyInitialization(*this, argExpr, param->getType(), | ||||
6266 | /*SuppressUserConversions*/false, | ||||
6267 | /*InOverloadResolution=*/true, | ||||
6268 | /*AllowObjCWritebackConversion=*/ | ||||
6269 | getLangOpts().ObjCAutoRefCount, | ||||
6270 | /*AllowExplicit*/false); | ||||
6271 | // This function looks for a reasonably-exact match, so we consider | ||||
6272 | // incompatible pointer conversions to be a failure here. | ||||
6273 | if (ConversionState.isBad() || | ||||
6274 | (ConversionState.isStandard() && | ||||
6275 | ConversionState.Standard.Second == | ||||
6276 | ICK_Incompatible_Pointer_Conversion)) { | ||||
6277 | Match = false; | ||||
6278 | break; | ||||
6279 | } | ||||
6280 | } | ||||
6281 | // Promote additional arguments to variadic methods. | ||||
6282 | if (Match && Method->isVariadic()) { | ||||
6283 | for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) { | ||||
6284 | if (Args[i]->isTypeDependent()) { | ||||
6285 | Match = false; | ||||
6286 | break; | ||||
6287 | } | ||||
6288 | ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, | ||||
6289 | nullptr); | ||||
6290 | if (Arg.isInvalid()) { | ||||
6291 | Match = false; | ||||
6292 | break; | ||||
6293 | } | ||||
6294 | } | ||||
6295 | } else { | ||||
6296 | // Check for extra arguments to non-variadic methods. | ||||
6297 | if (Args.size() != NumNamedArgs) | ||||
6298 | Match = false; | ||||
6299 | else if (Match && NumNamedArgs == 0 && Methods.size() > 1) { | ||||
6300 | // Special case when selectors have no argument. In this case, select | ||||
6301 | // one with the most general result type of 'id'. | ||||
6302 | for (unsigned b = 0, e = Methods.size(); b < e; b++) { | ||||
6303 | QualType ReturnT = Methods[b]->getReturnType(); | ||||
6304 | if (ReturnT->isObjCIdType()) | ||||
6305 | return Methods[b]; | ||||
6306 | } | ||||
6307 | } | ||||
6308 | } | ||||
6309 | |||||
6310 | if (Match) | ||||
6311 | return Method; | ||||
6312 | } | ||||
6313 | return nullptr; | ||||
6314 | } | ||||
6315 | |||||
6316 | static bool | ||||
6317 | convertArgsForAvailabilityChecks(Sema &S, FunctionDecl *Function, Expr *ThisArg, | ||||
6318 | ArrayRef<Expr *> Args, Sema::SFINAETrap &Trap, | ||||
6319 | bool MissingImplicitThis, Expr *&ConvertedThis, | ||||
6320 | SmallVectorImpl<Expr *> &ConvertedArgs) { | ||||
6321 | if (ThisArg) { | ||||
6322 | CXXMethodDecl *Method = cast<CXXMethodDecl>(Function); | ||||
6323 | assert(!isa<CXXConstructorDecl>(Method) &&((!isa<CXXConstructorDecl>(Method) && "Shouldn't have `this` for ctors!" ) ? static_cast<void> (0) : __assert_fail ("!isa<CXXConstructorDecl>(Method) && \"Shouldn't have `this` for ctors!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6324, __PRETTY_FUNCTION__)) | ||||
6324 | "Shouldn't have `this` for ctors!")((!isa<CXXConstructorDecl>(Method) && "Shouldn't have `this` for ctors!" ) ? static_cast<void> (0) : __assert_fail ("!isa<CXXConstructorDecl>(Method) && \"Shouldn't have `this` for ctors!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6324, __PRETTY_FUNCTION__)); | ||||
6325 | assert(!Method->isStatic() && "Shouldn't have `this` for static methods!")((!Method->isStatic() && "Shouldn't have `this` for static methods!" ) ? static_cast<void> (0) : __assert_fail ("!Method->isStatic() && \"Shouldn't have `this` for static methods!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6325, __PRETTY_FUNCTION__)); | ||||
6326 | ExprResult R = S.PerformObjectArgumentInitialization( | ||||
6327 | ThisArg, /*Qualifier=*/nullptr, Method, Method); | ||||
6328 | if (R.isInvalid()) | ||||
6329 | return false; | ||||
6330 | ConvertedThis = R.get(); | ||||
6331 | } else { | ||||
6332 | if (auto *MD = dyn_cast<CXXMethodDecl>(Function)) { | ||||
6333 | (void)MD; | ||||
6334 | assert((MissingImplicitThis || MD->isStatic() ||(((MissingImplicitThis || MD->isStatic() || isa<CXXConstructorDecl >(MD)) && "Expected `this` for non-ctor instance methods" ) ? static_cast<void> (0) : __assert_fail ("(MissingImplicitThis || MD->isStatic() || isa<CXXConstructorDecl>(MD)) && \"Expected `this` for non-ctor instance methods\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6336, __PRETTY_FUNCTION__)) | ||||
6335 | isa<CXXConstructorDecl>(MD)) &&(((MissingImplicitThis || MD->isStatic() || isa<CXXConstructorDecl >(MD)) && "Expected `this` for non-ctor instance methods" ) ? static_cast<void> (0) : __assert_fail ("(MissingImplicitThis || MD->isStatic() || isa<CXXConstructorDecl>(MD)) && \"Expected `this` for non-ctor instance methods\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6336, __PRETTY_FUNCTION__)) | ||||
6336 | "Expected `this` for non-ctor instance methods")(((MissingImplicitThis || MD->isStatic() || isa<CXXConstructorDecl >(MD)) && "Expected `this` for non-ctor instance methods" ) ? static_cast<void> (0) : __assert_fail ("(MissingImplicitThis || MD->isStatic() || isa<CXXConstructorDecl>(MD)) && \"Expected `this` for non-ctor instance methods\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6336, __PRETTY_FUNCTION__)); | ||||
6337 | } | ||||
6338 | ConvertedThis = nullptr; | ||||
6339 | } | ||||
6340 | |||||
6341 | // Ignore any variadic arguments. Converting them is pointless, since the | ||||
6342 | // user can't refer to them in the function condition. | ||||
6343 | unsigned ArgSizeNoVarargs = std::min(Function->param_size(), Args.size()); | ||||
6344 | |||||
6345 | // Convert the arguments. | ||||
6346 | for (unsigned I = 0; I != ArgSizeNoVarargs; ++I) { | ||||
6347 | ExprResult R; | ||||
6348 | R = S.PerformCopyInitialization(InitializedEntity::InitializeParameter( | ||||
6349 | S.Context, Function->getParamDecl(I)), | ||||
6350 | SourceLocation(), Args[I]); | ||||
6351 | |||||
6352 | if (R.isInvalid()) | ||||
6353 | return false; | ||||
6354 | |||||
6355 | ConvertedArgs.push_back(R.get()); | ||||
6356 | } | ||||
6357 | |||||
6358 | if (Trap.hasErrorOccurred()) | ||||
6359 | return false; | ||||
6360 | |||||
6361 | // Push default arguments if needed. | ||||
6362 | if (!Function->isVariadic() && Args.size() < Function->getNumParams()) { | ||||
6363 | for (unsigned i = Args.size(), e = Function->getNumParams(); i != e; ++i) { | ||||
6364 | ParmVarDecl *P = Function->getParamDecl(i); | ||||
6365 | Expr *DefArg = P->hasUninstantiatedDefaultArg() | ||||
6366 | ? P->getUninstantiatedDefaultArg() | ||||
6367 | : P->getDefaultArg(); | ||||
6368 | // This can only happen in code completion, i.e. when PartialOverloading | ||||
6369 | // is true. | ||||
6370 | if (!DefArg) | ||||
6371 | return false; | ||||
6372 | ExprResult R = | ||||
6373 | S.PerformCopyInitialization(InitializedEntity::InitializeParameter( | ||||
6374 | S.Context, Function->getParamDecl(i)), | ||||
6375 | SourceLocation(), DefArg); | ||||
6376 | if (R.isInvalid()) | ||||
6377 | return false; | ||||
6378 | ConvertedArgs.push_back(R.get()); | ||||
6379 | } | ||||
6380 | |||||
6381 | if (Trap.hasErrorOccurred()) | ||||
6382 | return false; | ||||
6383 | } | ||||
6384 | return true; | ||||
6385 | } | ||||
6386 | |||||
6387 | EnableIfAttr *Sema::CheckEnableIf(FunctionDecl *Function, ArrayRef<Expr *> Args, | ||||
6388 | bool MissingImplicitThis) { | ||||
6389 | auto EnableIfAttrs = Function->specific_attrs<EnableIfAttr>(); | ||||
6390 | if (EnableIfAttrs.begin() == EnableIfAttrs.end()) | ||||
6391 | return nullptr; | ||||
6392 | |||||
6393 | SFINAETrap Trap(*this); | ||||
6394 | SmallVector<Expr *, 16> ConvertedArgs; | ||||
6395 | // FIXME: We should look into making enable_if late-parsed. | ||||
6396 | Expr *DiscardedThis; | ||||
6397 | if (!convertArgsForAvailabilityChecks( | ||||
6398 | *this, Function, /*ThisArg=*/nullptr, Args, Trap, | ||||
6399 | /*MissingImplicitThis=*/true, DiscardedThis, ConvertedArgs)) | ||||
6400 | return *EnableIfAttrs.begin(); | ||||
6401 | |||||
6402 | for (auto *EIA : EnableIfAttrs) { | ||||
6403 | APValue Result; | ||||
6404 | // FIXME: This doesn't consider value-dependent cases, because doing so is | ||||
6405 | // very difficult. Ideally, we should handle them more gracefully. | ||||
6406 | if (EIA->getCond()->isValueDependent() || | ||||
6407 | !EIA->getCond()->EvaluateWithSubstitution( | ||||
6408 | Result, Context, Function, llvm::makeArrayRef(ConvertedArgs))) | ||||
6409 | return EIA; | ||||
6410 | |||||
6411 | if (!Result.isInt() || !Result.getInt().getBoolValue()) | ||||
6412 | return EIA; | ||||
6413 | } | ||||
6414 | return nullptr; | ||||
6415 | } | ||||
6416 | |||||
6417 | template <typename CheckFn> | ||||
6418 | static bool diagnoseDiagnoseIfAttrsWith(Sema &S, const NamedDecl *ND, | ||||
6419 | bool ArgDependent, SourceLocation Loc, | ||||
6420 | CheckFn &&IsSuccessful) { | ||||
6421 | SmallVector<const DiagnoseIfAttr *, 8> Attrs; | ||||
6422 | for (const auto *DIA : ND->specific_attrs<DiagnoseIfAttr>()) { | ||||
6423 | if (ArgDependent == DIA->getArgDependent()) | ||||
6424 | Attrs.push_back(DIA); | ||||
6425 | } | ||||
6426 | |||||
6427 | // Common case: No diagnose_if attributes, so we can quit early. | ||||
6428 | if (Attrs.empty()) | ||||
6429 | return false; | ||||
6430 | |||||
6431 | auto WarningBegin = std::stable_partition( | ||||
6432 | Attrs.begin(), Attrs.end(), | ||||
6433 | [](const DiagnoseIfAttr *DIA) { return DIA->isError(); }); | ||||
6434 | |||||
6435 | // Note that diagnose_if attributes are late-parsed, so they appear in the | ||||
6436 | // correct order (unlike enable_if attributes). | ||||
6437 | auto ErrAttr = llvm::find_if(llvm::make_range(Attrs.begin(), WarningBegin), | ||||
6438 | IsSuccessful); | ||||
6439 | if (ErrAttr != WarningBegin) { | ||||
6440 | const DiagnoseIfAttr *DIA = *ErrAttr; | ||||
6441 | S.Diag(Loc, diag::err_diagnose_if_succeeded) << DIA->getMessage(); | ||||
6442 | S.Diag(DIA->getLocation(), diag::note_from_diagnose_if) | ||||
6443 | << DIA->getParent() << DIA->getCond()->getSourceRange(); | ||||
6444 | return true; | ||||
6445 | } | ||||
6446 | |||||
6447 | for (const auto *DIA : llvm::make_range(WarningBegin, Attrs.end())) | ||||
6448 | if (IsSuccessful(DIA)) { | ||||
6449 | S.Diag(Loc, diag::warn_diagnose_if_succeeded) << DIA->getMessage(); | ||||
6450 | S.Diag(DIA->getLocation(), diag::note_from_diagnose_if) | ||||
6451 | << DIA->getParent() << DIA->getCond()->getSourceRange(); | ||||
6452 | } | ||||
6453 | |||||
6454 | return false; | ||||
6455 | } | ||||
6456 | |||||
6457 | bool Sema::diagnoseArgDependentDiagnoseIfAttrs(const FunctionDecl *Function, | ||||
6458 | const Expr *ThisArg, | ||||
6459 | ArrayRef<const Expr *> Args, | ||||
6460 | SourceLocation Loc) { | ||||
6461 | return diagnoseDiagnoseIfAttrsWith( | ||||
6462 | *this, Function, /*ArgDependent=*/true, Loc, | ||||
6463 | [&](const DiagnoseIfAttr *DIA) { | ||||
6464 | APValue Result; | ||||
6465 | // It's sane to use the same Args for any redecl of this function, since | ||||
6466 | // EvaluateWithSubstitution only cares about the position of each | ||||
6467 | // argument in the arg list, not the ParmVarDecl* it maps to. | ||||
6468 | if (!DIA->getCond()->EvaluateWithSubstitution( | ||||
6469 | Result, Context, cast<FunctionDecl>(DIA->getParent()), Args, ThisArg)) | ||||
6470 | return false; | ||||
6471 | return Result.isInt() && Result.getInt().getBoolValue(); | ||||
6472 | }); | ||||
6473 | } | ||||
6474 | |||||
6475 | bool Sema::diagnoseArgIndependentDiagnoseIfAttrs(const NamedDecl *ND, | ||||
6476 | SourceLocation Loc) { | ||||
6477 | return diagnoseDiagnoseIfAttrsWith( | ||||
6478 | *this, ND, /*ArgDependent=*/false, Loc, | ||||
6479 | [&](const DiagnoseIfAttr *DIA) { | ||||
6480 | bool Result; | ||||
6481 | return DIA->getCond()->EvaluateAsBooleanCondition(Result, Context) && | ||||
6482 | Result; | ||||
6483 | }); | ||||
6484 | } | ||||
6485 | |||||
6486 | /// Add all of the function declarations in the given function set to | ||||
6487 | /// the overload candidate set. | ||||
6488 | void Sema::AddFunctionCandidates(const UnresolvedSetImpl &Fns, | ||||
6489 | ArrayRef<Expr *> Args, | ||||
6490 | OverloadCandidateSet &CandidateSet, | ||||
6491 | TemplateArgumentListInfo *ExplicitTemplateArgs, | ||||
6492 | bool SuppressUserConversions, | ||||
6493 | bool PartialOverloading, | ||||
6494 | bool FirstArgumentIsBase) { | ||||
6495 | for (UnresolvedSetIterator F = Fns.begin(), E = Fns.end(); F != E; ++F) { | ||||
6496 | NamedDecl *D = F.getDecl()->getUnderlyingDecl(); | ||||
6497 | ArrayRef<Expr *> FunctionArgs = Args; | ||||
6498 | |||||
6499 | FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D); | ||||
6500 | FunctionDecl *FD = | ||||
6501 | FunTmpl ? FunTmpl->getTemplatedDecl() : cast<FunctionDecl>(D); | ||||
6502 | |||||
6503 | if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic()) { | ||||
6504 | QualType ObjectType; | ||||
6505 | Expr::Classification ObjectClassification; | ||||
6506 | if (Args.size() > 0) { | ||||
6507 | if (Expr *E = Args[0]) { | ||||
6508 | // Use the explicit base to restrict the lookup: | ||||
6509 | ObjectType = E->getType(); | ||||
6510 | // Pointers in the object arguments are implicitly dereferenced, so we | ||||
6511 | // always classify them as l-values. | ||||
6512 | if (!ObjectType.isNull() && ObjectType->isPointerType()) | ||||
6513 | ObjectClassification = Expr::Classification::makeSimpleLValue(); | ||||
6514 | else | ||||
6515 | ObjectClassification = E->Classify(Context); | ||||
6516 | } // .. else there is an implicit base. | ||||
6517 | FunctionArgs = Args.slice(1); | ||||
6518 | } | ||||
6519 | if (FunTmpl) { | ||||
6520 | AddMethodTemplateCandidate( | ||||
6521 | FunTmpl, F.getPair(), | ||||
6522 | cast<CXXRecordDecl>(FunTmpl->getDeclContext()), | ||||
6523 | ExplicitTemplateArgs, ObjectType, ObjectClassification, | ||||
6524 | FunctionArgs, CandidateSet, SuppressUserConversions, | ||||
6525 | PartialOverloading); | ||||
6526 | } else { | ||||
6527 | AddMethodCandidate(cast<CXXMethodDecl>(FD), F.getPair(), | ||||
6528 | cast<CXXMethodDecl>(FD)->getParent(), ObjectType, | ||||
6529 | ObjectClassification, FunctionArgs, CandidateSet, | ||||
6530 | SuppressUserConversions, PartialOverloading); | ||||
6531 | } | ||||
6532 | } else { | ||||
6533 | // This branch handles both standalone functions and static methods. | ||||
6534 | |||||
6535 | // Slice the first argument (which is the base) when we access | ||||
6536 | // static method as non-static. | ||||
6537 | if (Args.size() > 0 && | ||||
6538 | (!Args[0] || (FirstArgumentIsBase && isa<CXXMethodDecl>(FD) && | ||||
6539 | !isa<CXXConstructorDecl>(FD)))) { | ||||
6540 | assert(cast<CXXMethodDecl>(FD)->isStatic())((cast<CXXMethodDecl>(FD)->isStatic()) ? static_cast <void> (0) : __assert_fail ("cast<CXXMethodDecl>(FD)->isStatic()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6540, __PRETTY_FUNCTION__)); | ||||
6541 | FunctionArgs = Args.slice(1); | ||||
6542 | } | ||||
6543 | if (FunTmpl) { | ||||
6544 | AddTemplateOverloadCandidate( | ||||
6545 | FunTmpl, F.getPair(), ExplicitTemplateArgs, FunctionArgs, | ||||
6546 | CandidateSet, SuppressUserConversions, PartialOverloading); | ||||
6547 | } else { | ||||
6548 | AddOverloadCandidate(FD, F.getPair(), FunctionArgs, CandidateSet, | ||||
6549 | SuppressUserConversions, PartialOverloading); | ||||
6550 | } | ||||
6551 | } | ||||
6552 | } | ||||
6553 | } | ||||
6554 | |||||
6555 | /// AddMethodCandidate - Adds a named decl (which is some kind of | ||||
6556 | /// method) as a method candidate to the given overload set. | ||||
6557 | void Sema::AddMethodCandidate(DeclAccessPair FoundDecl, | ||||
6558 | QualType ObjectType, | ||||
6559 | Expr::Classification ObjectClassification, | ||||
6560 | ArrayRef<Expr *> Args, | ||||
6561 | OverloadCandidateSet& CandidateSet, | ||||
6562 | bool SuppressUserConversions) { | ||||
6563 | NamedDecl *Decl = FoundDecl.getDecl(); | ||||
6564 | CXXRecordDecl *ActingContext = cast<CXXRecordDecl>(Decl->getDeclContext()); | ||||
6565 | |||||
6566 | if (isa<UsingShadowDecl>(Decl)) | ||||
6567 | Decl = cast<UsingShadowDecl>(Decl)->getTargetDecl(); | ||||
6568 | |||||
6569 | if (FunctionTemplateDecl *TD = dyn_cast<FunctionTemplateDecl>(Decl)) { | ||||
6570 | assert(isa<CXXMethodDecl>(TD->getTemplatedDecl()) &&((isa<CXXMethodDecl>(TD->getTemplatedDecl()) && "Expected a member function template") ? static_cast<void > (0) : __assert_fail ("isa<CXXMethodDecl>(TD->getTemplatedDecl()) && \"Expected a member function template\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6571, __PRETTY_FUNCTION__)) | ||||
6571 | "Expected a member function template")((isa<CXXMethodDecl>(TD->getTemplatedDecl()) && "Expected a member function template") ? static_cast<void > (0) : __assert_fail ("isa<CXXMethodDecl>(TD->getTemplatedDecl()) && \"Expected a member function template\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6571, __PRETTY_FUNCTION__)); | ||||
6572 | AddMethodTemplateCandidate(TD, FoundDecl, ActingContext, | ||||
6573 | /*ExplicitArgs*/ nullptr, ObjectType, | ||||
6574 | ObjectClassification, Args, CandidateSet, | ||||
6575 | SuppressUserConversions); | ||||
6576 | } else { | ||||
6577 | AddMethodCandidate(cast<CXXMethodDecl>(Decl), FoundDecl, ActingContext, | ||||
6578 | ObjectType, ObjectClassification, Args, CandidateSet, | ||||
6579 | SuppressUserConversions); | ||||
6580 | } | ||||
6581 | } | ||||
6582 | |||||
6583 | /// AddMethodCandidate - Adds the given C++ member function to the set | ||||
6584 | /// of candidate functions, using the given function call arguments | ||||
6585 | /// and the object argument (@c Object). For example, in a call | ||||
6586 | /// @c o.f(a1,a2), @c Object will contain @c o and @c Args will contain | ||||
6587 | /// both @c a1 and @c a2. If @p SuppressUserConversions, then don't | ||||
6588 | /// allow user-defined conversions via constructors or conversion | ||||
6589 | /// operators. | ||||
6590 | void | ||||
6591 | Sema::AddMethodCandidate(CXXMethodDecl *Method, DeclAccessPair FoundDecl, | ||||
6592 | CXXRecordDecl *ActingContext, QualType ObjectType, | ||||
6593 | Expr::Classification ObjectClassification, | ||||
6594 | ArrayRef<Expr *> Args, | ||||
6595 | OverloadCandidateSet &CandidateSet, | ||||
6596 | bool SuppressUserConversions, | ||||
6597 | bool PartialOverloading, | ||||
6598 | ConversionSequenceList EarlyConversions) { | ||||
6599 | const FunctionProtoType *Proto | ||||
6600 | = dyn_cast<FunctionProtoType>(Method->getType()->getAs<FunctionType>()); | ||||
6601 | assert(Proto && "Methods without a prototype cannot be overloaded")((Proto && "Methods without a prototype cannot be overloaded" ) ? static_cast<void> (0) : __assert_fail ("Proto && \"Methods without a prototype cannot be overloaded\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6601, __PRETTY_FUNCTION__)); | ||||
6602 | assert(!isa<CXXConstructorDecl>(Method) &&((!isa<CXXConstructorDecl>(Method) && "Use AddOverloadCandidate for constructors" ) ? static_cast<void> (0) : __assert_fail ("!isa<CXXConstructorDecl>(Method) && \"Use AddOverloadCandidate for constructors\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6603, __PRETTY_FUNCTION__)) | ||||
6603 | "Use AddOverloadCandidate for constructors")((!isa<CXXConstructorDecl>(Method) && "Use AddOverloadCandidate for constructors" ) ? static_cast<void> (0) : __assert_fail ("!isa<CXXConstructorDecl>(Method) && \"Use AddOverloadCandidate for constructors\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6603, __PRETTY_FUNCTION__)); | ||||
6604 | |||||
6605 | if (!CandidateSet.isNewCandidate(Method)) | ||||
6606 | return; | ||||
6607 | |||||
6608 | // C++11 [class.copy]p23: [DR1402] | ||||
6609 | // A defaulted move assignment operator that is defined as deleted is | ||||
6610 | // ignored by overload resolution. | ||||
6611 | if (Method->isDefaulted() && Method->isDeleted() && | ||||
6612 | Method->isMoveAssignmentOperator()) | ||||
6613 | return; | ||||
6614 | |||||
6615 | // Overload resolution is always an unevaluated context. | ||||
6616 | EnterExpressionEvaluationContext Unevaluated( | ||||
6617 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | ||||
6618 | |||||
6619 | // Add this candidate | ||||
6620 | OverloadCandidate &Candidate = | ||||
6621 | CandidateSet.addCandidate(Args.size() + 1, EarlyConversions); | ||||
6622 | Candidate.FoundDecl = FoundDecl; | ||||
6623 | Candidate.Function = Method; | ||||
6624 | Candidate.IsSurrogate = false; | ||||
6625 | Candidate.IgnoreObjectArgument = false; | ||||
6626 | Candidate.ExplicitCallArguments = Args.size(); | ||||
6627 | |||||
6628 | unsigned NumParams = Proto->getNumParams(); | ||||
6629 | |||||
6630 | // (C++ 13.3.2p2): A candidate function having fewer than m | ||||
6631 | // parameters is viable only if it has an ellipsis in its parameter | ||||
6632 | // list (8.3.5). | ||||
6633 | if (TooManyArguments(NumParams, Args.size(), PartialOverloading) && | ||||
6634 | !Proto->isVariadic()) { | ||||
6635 | Candidate.Viable = false; | ||||
6636 | Candidate.FailureKind = ovl_fail_too_many_arguments; | ||||
6637 | return; | ||||
6638 | } | ||||
6639 | |||||
6640 | // (C++ 13.3.2p2): A candidate function having more than m parameters | ||||
6641 | // is viable only if the (m+1)st parameter has a default argument | ||||
6642 | // (8.3.6). For the purposes of overload resolution, the | ||||
6643 | // parameter list is truncated on the right, so that there are | ||||
6644 | // exactly m parameters. | ||||
6645 | unsigned MinRequiredArgs = Method->getMinRequiredArguments(); | ||||
6646 | if (Args.size() < MinRequiredArgs && !PartialOverloading) { | ||||
6647 | // Not enough arguments. | ||||
6648 | Candidate.Viable = false; | ||||
6649 | Candidate.FailureKind = ovl_fail_too_few_arguments; | ||||
6650 | return; | ||||
6651 | } | ||||
6652 | |||||
6653 | Candidate.Viable = true; | ||||
6654 | |||||
6655 | if (Method->isStatic() || ObjectType.isNull()) | ||||
6656 | // The implicit object argument is ignored. | ||||
6657 | Candidate.IgnoreObjectArgument = true; | ||||
6658 | else { | ||||
6659 | // Determine the implicit conversion sequence for the object | ||||
6660 | // parameter. | ||||
6661 | Candidate.Conversions[0] = TryObjectArgumentInitialization( | ||||
6662 | *this, CandidateSet.getLocation(), ObjectType, ObjectClassification, | ||||
6663 | Method, ActingContext); | ||||
6664 | if (Candidate.Conversions[0].isBad()) { | ||||
6665 | Candidate.Viable = false; | ||||
6666 | Candidate.FailureKind = ovl_fail_bad_conversion; | ||||
6667 | return; | ||||
6668 | } | ||||
6669 | } | ||||
6670 | |||||
6671 | // (CUDA B.1): Check for invalid calls between targets. | ||||
6672 | if (getLangOpts().CUDA) | ||||
6673 | if (const FunctionDecl *Caller = dyn_cast<FunctionDecl>(CurContext)) | ||||
6674 | if (!IsAllowedCUDACall(Caller, Method)) { | ||||
6675 | Candidate.Viable = false; | ||||
6676 | Candidate.FailureKind = ovl_fail_bad_target; | ||||
6677 | return; | ||||
6678 | } | ||||
6679 | |||||
6680 | // Determine the implicit conversion sequences for each of the | ||||
6681 | // arguments. | ||||
6682 | for (unsigned ArgIdx = 0; ArgIdx < Args.size(); ++ArgIdx) { | ||||
6683 | if (Candidate.Conversions[ArgIdx + 1].isInitialized()) { | ||||
6684 | // We already formed a conversion sequence for this parameter during | ||||
6685 | // template argument deduction. | ||||
6686 | } else if (ArgIdx < NumParams) { | ||||
6687 | // (C++ 13.3.2p3): for F to be a viable function, there shall | ||||
6688 | // exist for each argument an implicit conversion sequence | ||||
6689 | // (13.3.3.1) that converts that argument to the corresponding | ||||
6690 | // parameter of F. | ||||
6691 | QualType ParamType = Proto->getParamType(ArgIdx); | ||||
6692 | Candidate.Conversions[ArgIdx + 1] | ||||
6693 | = TryCopyInitialization(*this, Args[ArgIdx], ParamType, | ||||
6694 | SuppressUserConversions, | ||||
6695 | /*InOverloadResolution=*/true, | ||||
6696 | /*AllowObjCWritebackConversion=*/ | ||||
6697 | getLangOpts().ObjCAutoRefCount); | ||||
6698 | if (Candidate.Conversions[ArgIdx + 1].isBad()) { | ||||
6699 | Candidate.Viable = false; | ||||
6700 | Candidate.FailureKind = ovl_fail_bad_conversion; | ||||
6701 | return; | ||||
6702 | } | ||||
6703 | } else { | ||||
6704 | // (C++ 13.3.2p2): For the purposes of overload resolution, any | ||||
6705 | // argument for which there is no corresponding parameter is | ||||
6706 | // considered to "match the ellipsis" (C+ 13.3.3.1.3). | ||||
6707 | Candidate.Conversions[ArgIdx + 1].setEllipsis(); | ||||
6708 | } | ||||
6709 | } | ||||
6710 | |||||
6711 | if (EnableIfAttr *FailedAttr = CheckEnableIf(Method, Args, true)) { | ||||
6712 | Candidate.Viable = false; | ||||
6713 | Candidate.FailureKind = ovl_fail_enable_if; | ||||
6714 | Candidate.DeductionFailure.Data = FailedAttr; | ||||
6715 | return; | ||||
6716 | } | ||||
6717 | |||||
6718 | if (Method->isMultiVersion() && Method->hasAttr<TargetAttr>() && | ||||
6719 | !Method->getAttr<TargetAttr>()->isDefaultVersion()) { | ||||
6720 | Candidate.Viable = false; | ||||
6721 | Candidate.FailureKind = ovl_non_default_multiversion_function; | ||||
6722 | } | ||||
6723 | } | ||||
6724 | |||||
6725 | /// Add a C++ member function template as a candidate to the candidate | ||||
6726 | /// set, using template argument deduction to produce an appropriate member | ||||
6727 | /// function template specialization. | ||||
6728 | void | ||||
6729 | Sema::AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl, | ||||
6730 | DeclAccessPair FoundDecl, | ||||
6731 | CXXRecordDecl *ActingContext, | ||||
6732 | TemplateArgumentListInfo *ExplicitTemplateArgs, | ||||
6733 | QualType ObjectType, | ||||
6734 | Expr::Classification ObjectClassification, | ||||
6735 | ArrayRef<Expr *> Args, | ||||
6736 | OverloadCandidateSet& CandidateSet, | ||||
6737 | bool SuppressUserConversions, | ||||
6738 | bool PartialOverloading) { | ||||
6739 | if (!CandidateSet.isNewCandidate(MethodTmpl)) | ||||
6740 | return; | ||||
6741 | |||||
6742 | // C++ [over.match.funcs]p7: | ||||
6743 | // In each case where a candidate is a function template, candidate | ||||
6744 | // function template specializations are generated using template argument | ||||
6745 | // deduction (14.8.3, 14.8.2). Those candidates are then handled as | ||||
6746 | // candidate functions in the usual way.113) A given name can refer to one | ||||
6747 | // or more function templates and also to a set of overloaded non-template | ||||
6748 | // functions. In such a case, the candidate functions generated from each | ||||
6749 | // function template are combined with the set of non-template candidate | ||||
6750 | // functions. | ||||
6751 | TemplateDeductionInfo Info(CandidateSet.getLocation()); | ||||
6752 | FunctionDecl *Specialization = nullptr; | ||||
6753 | ConversionSequenceList Conversions; | ||||
6754 | if (TemplateDeductionResult Result = DeduceTemplateArguments( | ||||
6755 | MethodTmpl, ExplicitTemplateArgs, Args, Specialization, Info, | ||||
6756 | PartialOverloading, [&](ArrayRef<QualType> ParamTypes) { | ||||
6757 | return CheckNonDependentConversions( | ||||
6758 | MethodTmpl, ParamTypes, Args, CandidateSet, Conversions, | ||||
6759 | SuppressUserConversions, ActingContext, ObjectType, | ||||
6760 | ObjectClassification); | ||||
6761 | })) { | ||||
6762 | OverloadCandidate &Candidate = | ||||
6763 | CandidateSet.addCandidate(Conversions.size(), Conversions); | ||||
6764 | Candidate.FoundDecl = FoundDecl; | ||||
6765 | Candidate.Function = MethodTmpl->getTemplatedDecl(); | ||||
6766 | Candidate.Viable = false; | ||||
6767 | Candidate.IsSurrogate = false; | ||||
6768 | Candidate.IgnoreObjectArgument = | ||||
6769 | cast<CXXMethodDecl>(Candidate.Function)->isStatic() || | ||||
6770 | ObjectType.isNull(); | ||||
6771 | Candidate.ExplicitCallArguments = Args.size(); | ||||
6772 | if (Result == TDK_NonDependentConversionFailure) | ||||
6773 | Candidate.FailureKind = ovl_fail_bad_conversion; | ||||
6774 | else { | ||||
6775 | Candidate.FailureKind = ovl_fail_bad_deduction; | ||||
6776 | Candidate.DeductionFailure = MakeDeductionFailureInfo(Context, Result, | ||||
6777 | Info); | ||||
6778 | } | ||||
6779 | return; | ||||
6780 | } | ||||
6781 | |||||
6782 | // Add the function template specialization produced by template argument | ||||
6783 | // deduction as a candidate. | ||||
6784 | assert(Specialization && "Missing member function template specialization?")((Specialization && "Missing member function template specialization?" ) ? static_cast<void> (0) : __assert_fail ("Specialization && \"Missing member function template specialization?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6784, __PRETTY_FUNCTION__)); | ||||
6785 | assert(isa<CXXMethodDecl>(Specialization) &&((isa<CXXMethodDecl>(Specialization) && "Specialization is not a member function?" ) ? static_cast<void> (0) : __assert_fail ("isa<CXXMethodDecl>(Specialization) && \"Specialization is not a member function?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6786, __PRETTY_FUNCTION__)) | ||||
6786 | "Specialization is not a member function?")((isa<CXXMethodDecl>(Specialization) && "Specialization is not a member function?" ) ? static_cast<void> (0) : __assert_fail ("isa<CXXMethodDecl>(Specialization) && \"Specialization is not a member function?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6786, __PRETTY_FUNCTION__)); | ||||
6787 | AddMethodCandidate(cast<CXXMethodDecl>(Specialization), FoundDecl, | ||||
6788 | ActingContext, ObjectType, ObjectClassification, Args, | ||||
6789 | CandidateSet, SuppressUserConversions, PartialOverloading, | ||||
6790 | Conversions); | ||||
6791 | } | ||||
6792 | |||||
6793 | /// Add a C++ function template specialization as a candidate | ||||
6794 | /// in the candidate set, using template argument deduction to produce | ||||
6795 | /// an appropriate function template specialization. | ||||
6796 | void Sema::AddTemplateOverloadCandidate( | ||||
6797 | FunctionTemplateDecl *FunctionTemplate, DeclAccessPair FoundDecl, | ||||
6798 | TemplateArgumentListInfo *ExplicitTemplateArgs, ArrayRef<Expr *> Args, | ||||
6799 | OverloadCandidateSet &CandidateSet, bool SuppressUserConversions, | ||||
6800 | bool PartialOverloading, bool AllowExplicit, ADLCallKind IsADLCandidate) { | ||||
6801 | if (!CandidateSet.isNewCandidate(FunctionTemplate)) | ||||
6802 | return; | ||||
6803 | |||||
6804 | // C++ [over.match.funcs]p7: | ||||
6805 | // In each case where a candidate is a function template, candidate | ||||
6806 | // function template specializations are generated using template argument | ||||
6807 | // deduction (14.8.3, 14.8.2). Those candidates are then handled as | ||||
6808 | // candidate functions in the usual way.113) A given name can refer to one | ||||
6809 | // or more function templates and also to a set of overloaded non-template | ||||
6810 | // functions. In such a case, the candidate functions generated from each | ||||
6811 | // function template are combined with the set of non-template candidate | ||||
6812 | // functions. | ||||
6813 | TemplateDeductionInfo Info(CandidateSet.getLocation()); | ||||
6814 | FunctionDecl *Specialization = nullptr; | ||||
6815 | ConversionSequenceList Conversions; | ||||
6816 | if (TemplateDeductionResult Result = DeduceTemplateArguments( | ||||
6817 | FunctionTemplate, ExplicitTemplateArgs, Args, Specialization, Info, | ||||
6818 | PartialOverloading, [&](ArrayRef<QualType> ParamTypes) { | ||||
6819 | return CheckNonDependentConversions(FunctionTemplate, ParamTypes, | ||||
6820 | Args, CandidateSet, Conversions, | ||||
6821 | SuppressUserConversions); | ||||
6822 | })) { | ||||
6823 | OverloadCandidate &Candidate = | ||||
6824 | CandidateSet.addCandidate(Conversions.size(), Conversions); | ||||
6825 | Candidate.FoundDecl = FoundDecl; | ||||
6826 | Candidate.Function = FunctionTemplate->getTemplatedDecl(); | ||||
6827 | Candidate.Viable = false; | ||||
6828 | Candidate.IsSurrogate = false; | ||||
6829 | Candidate.IsADLCandidate = IsADLCandidate; | ||||
6830 | // Ignore the object argument if there is one, since we don't have an object | ||||
6831 | // type. | ||||
6832 | Candidate.IgnoreObjectArgument = | ||||
6833 | isa<CXXMethodDecl>(Candidate.Function) && | ||||
6834 | !isa<CXXConstructorDecl>(Candidate.Function); | ||||
6835 | Candidate.ExplicitCallArguments = Args.size(); | ||||
6836 | if (Result == TDK_NonDependentConversionFailure) | ||||
6837 | Candidate.FailureKind = ovl_fail_bad_conversion; | ||||
6838 | else { | ||||
6839 | Candidate.FailureKind = ovl_fail_bad_deduction; | ||||
6840 | Candidate.DeductionFailure = MakeDeductionFailureInfo(Context, Result, | ||||
6841 | Info); | ||||
6842 | } | ||||
6843 | return; | ||||
6844 | } | ||||
6845 | |||||
6846 | // Add the function template specialization produced by template argument | ||||
6847 | // deduction as a candidate. | ||||
6848 | assert(Specialization && "Missing function template specialization?")((Specialization && "Missing function template specialization?" ) ? static_cast<void> (0) : __assert_fail ("Specialization && \"Missing function template specialization?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6848, __PRETTY_FUNCTION__)); | ||||
6849 | AddOverloadCandidate( | ||||
6850 | Specialization, FoundDecl, Args, CandidateSet, SuppressUserConversions, | ||||
6851 | PartialOverloading, AllowExplicit, | ||||
6852 | /*AllowExplicitConversions*/ false, IsADLCandidate, Conversions); | ||||
6853 | } | ||||
6854 | |||||
6855 | /// Check that implicit conversion sequences can be formed for each argument | ||||
6856 | /// whose corresponding parameter has a non-dependent type, per DR1391's | ||||
6857 | /// [temp.deduct.call]p10. | ||||
6858 | bool Sema::CheckNonDependentConversions( | ||||
6859 | FunctionTemplateDecl *FunctionTemplate, ArrayRef<QualType> ParamTypes, | ||||
6860 | ArrayRef<Expr *> Args, OverloadCandidateSet &CandidateSet, | ||||
6861 | ConversionSequenceList &Conversions, bool SuppressUserConversions, | ||||
6862 | CXXRecordDecl *ActingContext, QualType ObjectType, | ||||
6863 | Expr::Classification ObjectClassification) { | ||||
6864 | // FIXME: The cases in which we allow explicit conversions for constructor | ||||
6865 | // arguments never consider calling a constructor template. It's not clear | ||||
6866 | // that is correct. | ||||
6867 | const bool AllowExplicit = false; | ||||
6868 | |||||
6869 | auto *FD = FunctionTemplate->getTemplatedDecl(); | ||||
6870 | auto *Method = dyn_cast<CXXMethodDecl>(FD); | ||||
6871 | bool HasThisConversion = Method && !isa<CXXConstructorDecl>(Method); | ||||
6872 | unsigned ThisConversions = HasThisConversion ? 1 : 0; | ||||
6873 | |||||
6874 | Conversions = | ||||
6875 | CandidateSet.allocateConversionSequences(ThisConversions + Args.size()); | ||||
6876 | |||||
6877 | // Overload resolution is always an unevaluated context. | ||||
6878 | EnterExpressionEvaluationContext Unevaluated( | ||||
6879 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | ||||
6880 | |||||
6881 | // For a method call, check the 'this' conversion here too. DR1391 doesn't | ||||
6882 | // require that, but this check should never result in a hard error, and | ||||
6883 | // overload resolution is permitted to sidestep instantiations. | ||||
6884 | if (HasThisConversion && !cast<CXXMethodDecl>(FD)->isStatic() && | ||||
6885 | !ObjectType.isNull()) { | ||||
6886 | Conversions[0] = TryObjectArgumentInitialization( | ||||
6887 | *this, CandidateSet.getLocation(), ObjectType, ObjectClassification, | ||||
6888 | Method, ActingContext); | ||||
6889 | if (Conversions[0].isBad()) | ||||
6890 | return true; | ||||
6891 | } | ||||
6892 | |||||
6893 | for (unsigned I = 0, N = std::min(ParamTypes.size(), Args.size()); I != N; | ||||
6894 | ++I) { | ||||
6895 | QualType ParamType = ParamTypes[I]; | ||||
6896 | if (!ParamType->isDependentType()) { | ||||
6897 | Conversions[ThisConversions + I] | ||||
6898 | = TryCopyInitialization(*this, Args[I], ParamType, | ||||
6899 | SuppressUserConversions, | ||||
6900 | /*InOverloadResolution=*/true, | ||||
6901 | /*AllowObjCWritebackConversion=*/ | ||||
6902 | getLangOpts().ObjCAutoRefCount, | ||||
6903 | AllowExplicit); | ||||
6904 | if (Conversions[ThisConversions + I].isBad()) | ||||
6905 | return true; | ||||
6906 | } | ||||
6907 | } | ||||
6908 | |||||
6909 | return false; | ||||
6910 | } | ||||
6911 | |||||
6912 | /// Determine whether this is an allowable conversion from the result | ||||
6913 | /// of an explicit conversion operator to the expected type, per C++ | ||||
6914 | /// [over.match.conv]p1 and [over.match.ref]p1. | ||||
6915 | /// | ||||
6916 | /// \param ConvType The return type of the conversion function. | ||||
6917 | /// | ||||
6918 | /// \param ToType The type we are converting to. | ||||
6919 | /// | ||||
6920 | /// \param AllowObjCPointerConversion Allow a conversion from one | ||||
6921 | /// Objective-C pointer to another. | ||||
6922 | /// | ||||
6923 | /// \returns true if the conversion is allowable, false otherwise. | ||||
6924 | static bool isAllowableExplicitConversion(Sema &S, | ||||
6925 | QualType ConvType, QualType ToType, | ||||
6926 | bool AllowObjCPointerConversion) { | ||||
6927 | QualType ToNonRefType = ToType.getNonReferenceType(); | ||||
6928 | |||||
6929 | // Easy case: the types are the same. | ||||
6930 | if (S.Context.hasSameUnqualifiedType(ConvType, ToNonRefType)) | ||||
6931 | return true; | ||||
6932 | |||||
6933 | // Allow qualification conversions. | ||||
6934 | bool ObjCLifetimeConversion; | ||||
6935 | if (S.IsQualificationConversion(ConvType, ToNonRefType, /*CStyle*/false, | ||||
6936 | ObjCLifetimeConversion)) | ||||
6937 | return true; | ||||
6938 | |||||
6939 | // If we're not allowed to consider Objective-C pointer conversions, | ||||
6940 | // we're done. | ||||
6941 | if (!AllowObjCPointerConversion) | ||||
6942 | return false; | ||||
6943 | |||||
6944 | // Is this an Objective-C pointer conversion? | ||||
6945 | bool IncompatibleObjC = false; | ||||
6946 | QualType ConvertedType; | ||||
6947 | return S.isObjCPointerConversion(ConvType, ToNonRefType, ConvertedType, | ||||
6948 | IncompatibleObjC); | ||||
6949 | } | ||||
6950 | |||||
6951 | /// AddConversionCandidate - Add a C++ conversion function as a | ||||
6952 | /// candidate in the candidate set (C++ [over.match.conv], | ||||
6953 | /// C++ [over.match.copy]). From is the expression we're converting from, | ||||
6954 | /// and ToType is the type that we're eventually trying to convert to | ||||
6955 | /// (which may or may not be the same type as the type that the | ||||
6956 | /// conversion function produces). | ||||
6957 | void Sema::AddConversionCandidate( | ||||
6958 | CXXConversionDecl *Conversion, DeclAccessPair FoundDecl, | ||||
6959 | CXXRecordDecl *ActingContext, Expr *From, QualType ToType, | ||||
6960 | OverloadCandidateSet &CandidateSet, bool AllowObjCConversionOnExplicit, | ||||
6961 | bool AllowExplicit, bool AllowResultConversion) { | ||||
6962 | assert(!Conversion->getDescribedFunctionTemplate() &&((!Conversion->getDescribedFunctionTemplate() && "Conversion function templates use AddTemplateConversionCandidate" ) ? static_cast<void> (0) : __assert_fail ("!Conversion->getDescribedFunctionTemplate() && \"Conversion function templates use AddTemplateConversionCandidate\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6963, __PRETTY_FUNCTION__)) | ||||
6963 | "Conversion function templates use AddTemplateConversionCandidate")((!Conversion->getDescribedFunctionTemplate() && "Conversion function templates use AddTemplateConversionCandidate" ) ? static_cast<void> (0) : __assert_fail ("!Conversion->getDescribedFunctionTemplate() && \"Conversion function templates use AddTemplateConversionCandidate\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 6963, __PRETTY_FUNCTION__)); | ||||
6964 | QualType ConvType = Conversion->getConversionType().getNonReferenceType(); | ||||
6965 | if (!CandidateSet.isNewCandidate(Conversion)) | ||||
6966 | return; | ||||
6967 | |||||
6968 | // If the conversion function has an undeduced return type, trigger its | ||||
6969 | // deduction now. | ||||
6970 | if (getLangOpts().CPlusPlus14 && ConvType->isUndeducedType()) { | ||||
6971 | if (DeduceReturnType(Conversion, From->getExprLoc())) | ||||
6972 | return; | ||||
6973 | ConvType = Conversion->getConversionType().getNonReferenceType(); | ||||
6974 | } | ||||
6975 | |||||
6976 | // If we don't allow any conversion of the result type, ignore conversion | ||||
6977 | // functions that don't convert to exactly (possibly cv-qualified) T. | ||||
6978 | if (!AllowResultConversion && | ||||
6979 | !Context.hasSameUnqualifiedType(Conversion->getConversionType(), ToType)) | ||||
6980 | return; | ||||
6981 | |||||
6982 | // Per C++ [over.match.conv]p1, [over.match.ref]p1, an explicit conversion | ||||
6983 | // operator is only a candidate if its return type is the target type or | ||||
6984 | // can be converted to the target type with a qualification conversion. | ||||
6985 | if (Conversion->isExplicit() && | ||||
6986 | !isAllowableExplicitConversion(*this, ConvType, ToType, | ||||
6987 | AllowObjCConversionOnExplicit)) | ||||
6988 | return; | ||||
6989 | |||||
6990 | // Overload resolution is always an unevaluated context. | ||||
6991 | EnterExpressionEvaluationContext Unevaluated( | ||||
6992 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | ||||
6993 | |||||
6994 | // Add this candidate | ||||
6995 | OverloadCandidate &Candidate = CandidateSet.addCandidate(1); | ||||
6996 | Candidate.FoundDecl = FoundDecl; | ||||
6997 | Candidate.Function = Conversion; | ||||
6998 | Candidate.IsSurrogate = false; | ||||
6999 | Candidate.IgnoreObjectArgument = false; | ||||
7000 | Candidate.FinalConversion.setAsIdentityConversion(); | ||||
7001 | Candidate.FinalConversion.setFromType(ConvType); | ||||
7002 | Candidate.FinalConversion.setAllToTypes(ToType); | ||||
7003 | Candidate.Viable = true; | ||||
7004 | Candidate.ExplicitCallArguments = 1; | ||||
7005 | |||||
7006 | // C++ [over.match.funcs]p4: | ||||
7007 | // For conversion functions, the function is considered to be a member of | ||||
7008 | // the class of the implicit implied object argument for the purpose of | ||||
7009 | // defining the type of the implicit object parameter. | ||||
7010 | // | ||||
7011 | // Determine the implicit conversion sequence for the implicit | ||||
7012 | // object parameter. | ||||
7013 | QualType ImplicitParamType = From->getType(); | ||||
7014 | if (const PointerType *FromPtrType = ImplicitParamType->getAs<PointerType>()) | ||||
7015 | ImplicitParamType = FromPtrType->getPointeeType(); | ||||
7016 | CXXRecordDecl *ConversionContext | ||||
7017 | = cast<CXXRecordDecl>(ImplicitParamType->castAs<RecordType>()->getDecl()); | ||||
7018 | |||||
7019 | Candidate.Conversions[0] = TryObjectArgumentInitialization( | ||||
7020 | *this, CandidateSet.getLocation(), From->getType(), | ||||
7021 | From->Classify(Context), Conversion, ConversionContext); | ||||
7022 | |||||
7023 | if (Candidate.Conversions[0].isBad()) { | ||||
7024 | Candidate.Viable = false; | ||||
7025 | Candidate.FailureKind = ovl_fail_bad_conversion; | ||||
7026 | return; | ||||
7027 | } | ||||
7028 | |||||
7029 | // We won't go through a user-defined type conversion function to convert a | ||||
7030 | // derived to base as such conversions are given Conversion Rank. They only | ||||
7031 | // go through a copy constructor. 13.3.3.1.2-p4 [over.ics.user] | ||||
7032 | QualType FromCanon | ||||
7033 | = Context.getCanonicalType(From->getType().getUnqualifiedType()); | ||||
7034 | QualType ToCanon = Context.getCanonicalType(ToType).getUnqualifiedType(); | ||||
7035 | if (FromCanon == ToCanon || | ||||
7036 | IsDerivedFrom(CandidateSet.getLocation(), FromCanon, ToCanon)) { | ||||
7037 | Candidate.Viable = false; | ||||
7038 | Candidate.FailureKind = ovl_fail_trivial_conversion; | ||||
7039 | return; | ||||
7040 | } | ||||
7041 | |||||
7042 | // To determine what the conversion from the result of calling the | ||||
7043 | // conversion function to the type we're eventually trying to | ||||
7044 | // convert to (ToType), we need to synthesize a call to the | ||||
7045 | // conversion function and attempt copy initialization from it. This | ||||
7046 | // makes sure that we get the right semantics with respect to | ||||
7047 | // lvalues/rvalues and the type. Fortunately, we can allocate this | ||||
7048 | // call on the stack and we don't need its arguments to be | ||||
7049 | // well-formed. | ||||
7050 | DeclRefExpr ConversionRef(Context, Conversion, false, Conversion->getType(), | ||||
7051 | VK_LValue, From->getBeginLoc()); | ||||
7052 | ImplicitCastExpr ConversionFn(ImplicitCastExpr::OnStack, | ||||
7053 | Context.getPointerType(Conversion->getType()), | ||||
7054 | CK_FunctionToPointerDecay, | ||||
7055 | &ConversionRef, VK_RValue); | ||||
7056 | |||||
7057 | QualType ConversionType = Conversion->getConversionType(); | ||||
7058 | if (!isCompleteType(From->getBeginLoc(), ConversionType)) { | ||||
7059 | Candidate.Viable = false; | ||||
7060 | Candidate.FailureKind = ovl_fail_bad_final_conversion; | ||||
7061 | return; | ||||
7062 | } | ||||
7063 | |||||
7064 | ExprValueKind VK = Expr::getValueKindForType(ConversionType); | ||||
7065 | |||||
7066 | // Note that it is safe to allocate CallExpr on the stack here because | ||||
7067 | // there are 0 arguments (i.e., nothing is allocated using ASTContext's | ||||
7068 | // allocator). | ||||
7069 | QualType CallResultType = ConversionType.getNonLValueExprType(Context); | ||||
7070 | |||||
7071 | alignas(CallExpr) char Buffer[sizeof(CallExpr) + sizeof(Stmt *)]; | ||||
7072 | CallExpr *TheTemporaryCall = CallExpr::CreateTemporary( | ||||
7073 | Buffer, &ConversionFn, CallResultType, VK, From->getBeginLoc()); | ||||
7074 | |||||
7075 | ImplicitConversionSequence ICS = | ||||
7076 | TryCopyInitialization(*this, TheTemporaryCall, ToType, | ||||
7077 | /*SuppressUserConversions=*/true, | ||||
7078 | /*InOverloadResolution=*/false, | ||||
7079 | /*AllowObjCWritebackConversion=*/false); | ||||
7080 | |||||
7081 | switch (ICS.getKind()) { | ||||
7082 | case ImplicitConversionSequence::StandardConversion: | ||||
7083 | Candidate.FinalConversion = ICS.Standard; | ||||
7084 | |||||
7085 | // C++ [over.ics.user]p3: | ||||
7086 | // If the user-defined conversion is specified by a specialization of a | ||||
7087 | // conversion function template, the second standard conversion sequence | ||||
7088 | // shall have exact match rank. | ||||
7089 | if (Conversion->getPrimaryTemplate() && | ||||
7090 | GetConversionRank(ICS.Standard.Second) != ICR_Exact_Match) { | ||||
7091 | Candidate.Viable = false; | ||||
7092 | Candidate.FailureKind = ovl_fail_final_conversion_not_exact; | ||||
7093 | return; | ||||
7094 | } | ||||
7095 | |||||
7096 | // C++0x [dcl.init.ref]p5: | ||||
7097 | // In the second case, if the reference is an rvalue reference and | ||||
7098 | // the second standard conversion sequence of the user-defined | ||||
7099 | // conversion sequence includes an lvalue-to-rvalue conversion, the | ||||
7100 | // program is ill-formed. | ||||
7101 | if (ToType->isRValueReferenceType() && | ||||
7102 | ICS.Standard.First == ICK_Lvalue_To_Rvalue) { | ||||
7103 | Candidate.Viable = false; | ||||
7104 | Candidate.FailureKind = ovl_fail_bad_final_conversion; | ||||
7105 | return; | ||||
7106 | } | ||||
7107 | break; | ||||
7108 | |||||
7109 | case ImplicitConversionSequence::BadConversion: | ||||
7110 | Candidate.Viable = false; | ||||
7111 | Candidate.FailureKind = ovl_fail_bad_final_conversion; | ||||
7112 | return; | ||||
7113 | |||||
7114 | default: | ||||
7115 | llvm_unreachable(::llvm::llvm_unreachable_internal("Can only end up with a standard conversion sequence or failure" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7116) | ||||
7116 | "Can only end up with a standard conversion sequence or failure")::llvm::llvm_unreachable_internal("Can only end up with a standard conversion sequence or failure" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7116); | ||||
7117 | } | ||||
7118 | |||||
7119 | if (!AllowExplicit && Conversion->getExplicitSpecifier().getKind() != | ||||
7120 | ExplicitSpecKind::ResolvedFalse) { | ||||
7121 | Candidate.Viable = false; | ||||
7122 | Candidate.FailureKind = ovl_fail_explicit_resolved; | ||||
7123 | return; | ||||
7124 | } | ||||
7125 | |||||
7126 | if (EnableIfAttr *FailedAttr = CheckEnableIf(Conversion, None)) { | ||||
7127 | Candidate.Viable = false; | ||||
7128 | Candidate.FailureKind = ovl_fail_enable_if; | ||||
7129 | Candidate.DeductionFailure.Data = FailedAttr; | ||||
7130 | return; | ||||
7131 | } | ||||
7132 | |||||
7133 | if (Conversion->isMultiVersion() && Conversion->hasAttr<TargetAttr>() && | ||||
7134 | !Conversion->getAttr<TargetAttr>()->isDefaultVersion()) { | ||||
7135 | Candidate.Viable = false; | ||||
7136 | Candidate.FailureKind = ovl_non_default_multiversion_function; | ||||
7137 | } | ||||
7138 | } | ||||
7139 | |||||
7140 | /// Adds a conversion function template specialization | ||||
7141 | /// candidate to the overload set, using template argument deduction | ||||
7142 | /// to deduce the template arguments of the conversion function | ||||
7143 | /// template from the type that we are converting to (C++ | ||||
7144 | /// [temp.deduct.conv]). | ||||
7145 | void Sema::AddTemplateConversionCandidate( | ||||
7146 | FunctionTemplateDecl *FunctionTemplate, DeclAccessPair FoundDecl, | ||||
7147 | CXXRecordDecl *ActingDC, Expr *From, QualType ToType, | ||||
7148 | OverloadCandidateSet &CandidateSet, bool AllowObjCConversionOnExplicit, | ||||
7149 | bool AllowExplicit, bool AllowResultConversion) { | ||||
7150 | assert(isa<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()) &&((isa<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl ()) && "Only conversion function templates permitted here" ) ? static_cast<void> (0) : __assert_fail ("isa<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()) && \"Only conversion function templates permitted here\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7151, __PRETTY_FUNCTION__)) | ||||
7151 | "Only conversion function templates permitted here")((isa<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl ()) && "Only conversion function templates permitted here" ) ? static_cast<void> (0) : __assert_fail ("isa<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()) && \"Only conversion function templates permitted here\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7151, __PRETTY_FUNCTION__)); | ||||
7152 | |||||
7153 | if (!CandidateSet.isNewCandidate(FunctionTemplate)) | ||||
7154 | return; | ||||
7155 | |||||
7156 | TemplateDeductionInfo Info(CandidateSet.getLocation()); | ||||
7157 | CXXConversionDecl *Specialization = nullptr; | ||||
7158 | if (TemplateDeductionResult Result | ||||
7159 | = DeduceTemplateArguments(FunctionTemplate, ToType, | ||||
7160 | Specialization, Info)) { | ||||
7161 | OverloadCandidate &Candidate = CandidateSet.addCandidate(); | ||||
7162 | Candidate.FoundDecl = FoundDecl; | ||||
7163 | Candidate.Function = FunctionTemplate->getTemplatedDecl(); | ||||
7164 | Candidate.Viable = false; | ||||
7165 | Candidate.FailureKind = ovl_fail_bad_deduction; | ||||
7166 | Candidate.IsSurrogate = false; | ||||
7167 | Candidate.IgnoreObjectArgument = false; | ||||
7168 | Candidate.ExplicitCallArguments = 1; | ||||
7169 | Candidate.DeductionFailure = MakeDeductionFailureInfo(Context, Result, | ||||
7170 | Info); | ||||
7171 | return; | ||||
7172 | } | ||||
7173 | |||||
7174 | // Add the conversion function template specialization produced by | ||||
7175 | // template argument deduction as a candidate. | ||||
7176 | assert(Specialization && "Missing function template specialization?")((Specialization && "Missing function template specialization?" ) ? static_cast<void> (0) : __assert_fail ("Specialization && \"Missing function template specialization?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7176, __PRETTY_FUNCTION__)); | ||||
7177 | AddConversionCandidate(Specialization, FoundDecl, ActingDC, From, ToType, | ||||
7178 | CandidateSet, AllowObjCConversionOnExplicit, | ||||
7179 | AllowExplicit, AllowResultConversion); | ||||
7180 | } | ||||
7181 | |||||
7182 | /// AddSurrogateCandidate - Adds a "surrogate" candidate function that | ||||
7183 | /// converts the given @c Object to a function pointer via the | ||||
7184 | /// conversion function @c Conversion, and then attempts to call it | ||||
7185 | /// with the given arguments (C++ [over.call.object]p2-4). Proto is | ||||
7186 | /// the type of function that we'll eventually be calling. | ||||
7187 | void Sema::AddSurrogateCandidate(CXXConversionDecl *Conversion, | ||||
7188 | DeclAccessPair FoundDecl, | ||||
7189 | CXXRecordDecl *ActingContext, | ||||
7190 | const FunctionProtoType *Proto, | ||||
7191 | Expr *Object, | ||||
7192 | ArrayRef<Expr *> Args, | ||||
7193 | OverloadCandidateSet& CandidateSet) { | ||||
7194 | if (!CandidateSet.isNewCandidate(Conversion)) | ||||
7195 | return; | ||||
7196 | |||||
7197 | // Overload resolution is always an unevaluated context. | ||||
7198 | EnterExpressionEvaluationContext Unevaluated( | ||||
7199 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | ||||
7200 | |||||
7201 | OverloadCandidate &Candidate = CandidateSet.addCandidate(Args.size() + 1); | ||||
7202 | Candidate.FoundDecl = FoundDecl; | ||||
7203 | Candidate.Function = nullptr; | ||||
7204 | Candidate.Surrogate = Conversion; | ||||
7205 | Candidate.Viable = true; | ||||
7206 | Candidate.IsSurrogate = true; | ||||
7207 | Candidate.IgnoreObjectArgument = false; | ||||
7208 | Candidate.ExplicitCallArguments = Args.size(); | ||||
7209 | |||||
7210 | // Determine the implicit conversion sequence for the implicit | ||||
7211 | // object parameter. | ||||
7212 | ImplicitConversionSequence ObjectInit = TryObjectArgumentInitialization( | ||||
7213 | *this, CandidateSet.getLocation(), Object->getType(), | ||||
7214 | Object->Classify(Context), Conversion, ActingContext); | ||||
7215 | if (ObjectInit.isBad()) { | ||||
7216 | Candidate.Viable = false; | ||||
7217 | Candidate.FailureKind = ovl_fail_bad_conversion; | ||||
7218 | Candidate.Conversions[0] = ObjectInit; | ||||
7219 | return; | ||||
7220 | } | ||||
7221 | |||||
7222 | // The first conversion is actually a user-defined conversion whose | ||||
7223 | // first conversion is ObjectInit's standard conversion (which is | ||||
7224 | // effectively a reference binding). Record it as such. | ||||
7225 | Candidate.Conversions[0].setUserDefined(); | ||||
7226 | Candidate.Conversions[0].UserDefined.Before = ObjectInit.Standard; | ||||
7227 | Candidate.Conversions[0].UserDefined.EllipsisConversion = false; | ||||
7228 | Candidate.Conversions[0].UserDefined.HadMultipleCandidates = false; | ||||
7229 | Candidate.Conversions[0].UserDefined.ConversionFunction = Conversion; | ||||
7230 | Candidate.Conversions[0].UserDefined.FoundConversionFunction = FoundDecl; | ||||
7231 | Candidate.Conversions[0].UserDefined.After | ||||
7232 | = Candidate.Conversions[0].UserDefined.Before; | ||||
7233 | Candidate.Conversions[0].UserDefined.After.setAsIdentityConversion(); | ||||
7234 | |||||
7235 | // Find the | ||||
7236 | unsigned NumParams = Proto->getNumParams(); | ||||
7237 | |||||
7238 | // (C++ 13.3.2p2): A candidate function having fewer than m | ||||
7239 | // parameters is viable only if it has an ellipsis in its parameter | ||||
7240 | // list (8.3.5). | ||||
7241 | if (Args.size() > NumParams && !Proto->isVariadic()) { | ||||
7242 | Candidate.Viable = false; | ||||
7243 | Candidate.FailureKind = ovl_fail_too_many_arguments; | ||||
7244 | return; | ||||
7245 | } | ||||
7246 | |||||
7247 | // Function types don't have any default arguments, so just check if | ||||
7248 | // we have enough arguments. | ||||
7249 | if (Args.size() < NumParams) { | ||||
7250 | // Not enough arguments. | ||||
7251 | Candidate.Viable = false; | ||||
7252 | Candidate.FailureKind = ovl_fail_too_few_arguments; | ||||
7253 | return; | ||||
7254 | } | ||||
7255 | |||||
7256 | // Determine the implicit conversion sequences for each of the | ||||
7257 | // arguments. | ||||
7258 | for (unsigned ArgIdx = 0, N = Args.size(); ArgIdx != N; ++ArgIdx) { | ||||
7259 | if (ArgIdx < NumParams) { | ||||
7260 | // (C++ 13.3.2p3): for F to be a viable function, there shall | ||||
7261 | // exist for each argument an implicit conversion sequence | ||||
7262 | // (13.3.3.1) that converts that argument to the corresponding | ||||
7263 | // parameter of F. | ||||
7264 | QualType ParamType = Proto->getParamType(ArgIdx); | ||||
7265 | Candidate.Conversions[ArgIdx + 1] | ||||
7266 | = TryCopyInitialization(*this, Args[ArgIdx], ParamType, | ||||
7267 | /*SuppressUserConversions=*/false, | ||||
7268 | /*InOverloadResolution=*/false, | ||||
7269 | /*AllowObjCWritebackConversion=*/ | ||||
7270 | getLangOpts().ObjCAutoRefCount); | ||||
7271 | if (Candidate.Conversions[ArgIdx + 1].isBad()) { | ||||
7272 | Candidate.Viable = false; | ||||
7273 | Candidate.FailureKind = ovl_fail_bad_conversion; | ||||
7274 | return; | ||||
7275 | } | ||||
7276 | } else { | ||||
7277 | // (C++ 13.3.2p2): For the purposes of overload resolution, any | ||||
7278 | // argument for which there is no corresponding parameter is | ||||
7279 | // considered to ""match the ellipsis" (C+ 13.3.3.1.3). | ||||
7280 | Candidate.Conversions[ArgIdx + 1].setEllipsis(); | ||||
7281 | } | ||||
7282 | } | ||||
7283 | |||||
7284 | if (EnableIfAttr *FailedAttr = CheckEnableIf(Conversion, None)) { | ||||
7285 | Candidate.Viable = false; | ||||
7286 | Candidate.FailureKind = ovl_fail_enable_if; | ||||
7287 | Candidate.DeductionFailure.Data = FailedAttr; | ||||
7288 | return; | ||||
7289 | } | ||||
7290 | } | ||||
7291 | |||||
7292 | /// Add overload candidates for overloaded operators that are | ||||
7293 | /// member functions. | ||||
7294 | /// | ||||
7295 | /// Add the overloaded operator candidates that are member functions | ||||
7296 | /// for the operator Op that was used in an operator expression such | ||||
7297 | /// as "x Op y". , Args/NumArgs provides the operator arguments, and | ||||
7298 | /// CandidateSet will store the added overload candidates. (C++ | ||||
7299 | /// [over.match.oper]). | ||||
7300 | void Sema::AddMemberOperatorCandidates(OverloadedOperatorKind Op, | ||||
7301 | SourceLocation OpLoc, | ||||
7302 | ArrayRef<Expr *> Args, | ||||
7303 | OverloadCandidateSet& CandidateSet, | ||||
7304 | SourceRange OpRange) { | ||||
7305 | DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(Op); | ||||
7306 | |||||
7307 | // C++ [over.match.oper]p3: | ||||
7308 | // For a unary operator @ with an operand of a type whose | ||||
7309 | // cv-unqualified version is T1, and for a binary operator @ with | ||||
7310 | // a left operand of a type whose cv-unqualified version is T1 and | ||||
7311 | // a right operand of a type whose cv-unqualified version is T2, | ||||
7312 | // three sets of candidate functions, designated member | ||||
7313 | // candidates, non-member candidates and built-in candidates, are | ||||
7314 | // constructed as follows: | ||||
7315 | QualType T1 = Args[0]->getType(); | ||||
7316 | |||||
7317 | // -- If T1 is a complete class type or a class currently being | ||||
7318 | // defined, the set of member candidates is the result of the | ||||
7319 | // qualified lookup of T1::operator@ (13.3.1.1.1); otherwise, | ||||
7320 | // the set of member candidates is empty. | ||||
7321 | if (const RecordType *T1Rec = T1->getAs<RecordType>()) { | ||||
7322 | // Complete the type if it can be completed. | ||||
7323 | if (!isCompleteType(OpLoc, T1) && !T1Rec->isBeingDefined()) | ||||
7324 | return; | ||||
7325 | // If the type is neither complete nor being defined, bail out now. | ||||
7326 | if (!T1Rec->getDecl()->getDefinition()) | ||||
7327 | return; | ||||
7328 | |||||
7329 | LookupResult Operators(*this, OpName, OpLoc, LookupOrdinaryName); | ||||
7330 | LookupQualifiedName(Operators, T1Rec->getDecl()); | ||||
7331 | Operators.suppressDiagnostics(); | ||||
7332 | |||||
7333 | for (LookupResult::iterator Oper = Operators.begin(), | ||||
7334 | OperEnd = Operators.end(); | ||||
7335 | Oper != OperEnd; | ||||
7336 | ++Oper) | ||||
7337 | AddMethodCandidate(Oper.getPair(), Args[0]->getType(), | ||||
7338 | Args[0]->Classify(Context), Args.slice(1), | ||||
7339 | CandidateSet, /*SuppressUserConversion=*/false); | ||||
7340 | } | ||||
7341 | } | ||||
7342 | |||||
7343 | /// AddBuiltinCandidate - Add a candidate for a built-in | ||||
7344 | /// operator. ResultTy and ParamTys are the result and parameter types | ||||
7345 | /// of the built-in candidate, respectively. Args and NumArgs are the | ||||
7346 | /// arguments being passed to the candidate. IsAssignmentOperator | ||||
7347 | /// should be true when this built-in candidate is an assignment | ||||
7348 | /// operator. NumContextualBoolArguments is the number of arguments | ||||
7349 | /// (at the beginning of the argument list) that will be contextually | ||||
7350 | /// converted to bool. | ||||
7351 | void Sema::AddBuiltinCandidate(QualType *ParamTys, ArrayRef<Expr *> Args, | ||||
7352 | OverloadCandidateSet& CandidateSet, | ||||
7353 | bool IsAssignmentOperator, | ||||
7354 | unsigned NumContextualBoolArguments) { | ||||
7355 | // Overload resolution is always an unevaluated context. | ||||
7356 | EnterExpressionEvaluationContext Unevaluated( | ||||
7357 | *this, Sema::ExpressionEvaluationContext::Unevaluated); | ||||
7358 | |||||
7359 | // Add this candidate | ||||
7360 | OverloadCandidate &Candidate = CandidateSet.addCandidate(Args.size()); | ||||
7361 | Candidate.FoundDecl = DeclAccessPair::make(nullptr, AS_none); | ||||
7362 | Candidate.Function = nullptr; | ||||
7363 | Candidate.IsSurrogate = false; | ||||
7364 | Candidate.IgnoreObjectArgument = false; | ||||
7365 | std::copy(ParamTys, ParamTys + Args.size(), Candidate.BuiltinParamTypes); | ||||
7366 | |||||
7367 | // Determine the implicit conversion sequences for each of the | ||||
7368 | // arguments. | ||||
7369 | Candidate.Viable = true; | ||||
7370 | Candidate.ExplicitCallArguments = Args.size(); | ||||
7371 | for (unsigned ArgIdx = 0, N = Args.size(); ArgIdx != N; ++ArgIdx) { | ||||
7372 | // C++ [over.match.oper]p4: | ||||
7373 | // For the built-in assignment operators, conversions of the | ||||
7374 | // left operand are restricted as follows: | ||||
7375 | // -- no temporaries are introduced to hold the left operand, and | ||||
7376 | // -- no user-defined conversions are applied to the left | ||||
7377 | // operand to achieve a type match with the left-most | ||||
7378 | // parameter of a built-in candidate. | ||||
7379 | // | ||||
7380 | // We block these conversions by turning off user-defined | ||||
7381 | // conversions, since that is the only way that initialization of | ||||
7382 | // a reference to a non-class type can occur from something that | ||||
7383 | // is not of the same type. | ||||
7384 | if (ArgIdx < NumContextualBoolArguments) { | ||||
7385 | assert(ParamTys[ArgIdx] == Context.BoolTy &&((ParamTys[ArgIdx] == Context.BoolTy && "Contextual conversion to bool requires bool type" ) ? static_cast<void> (0) : __assert_fail ("ParamTys[ArgIdx] == Context.BoolTy && \"Contextual conversion to bool requires bool type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7386, __PRETTY_FUNCTION__)) | ||||
7386 | "Contextual conversion to bool requires bool type")((ParamTys[ArgIdx] == Context.BoolTy && "Contextual conversion to bool requires bool type" ) ? static_cast<void> (0) : __assert_fail ("ParamTys[ArgIdx] == Context.BoolTy && \"Contextual conversion to bool requires bool type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7386, __PRETTY_FUNCTION__)); | ||||
7387 | Candidate.Conversions[ArgIdx] | ||||
7388 | = TryContextuallyConvertToBool(*this, Args[ArgIdx]); | ||||
7389 | } else { | ||||
7390 | Candidate.Conversions[ArgIdx] | ||||
7391 | = TryCopyInitialization(*this, Args[ArgIdx], ParamTys[ArgIdx], | ||||
7392 | ArgIdx == 0 && IsAssignmentOperator, | ||||
7393 | /*InOverloadResolution=*/false, | ||||
7394 | /*AllowObjCWritebackConversion=*/ | ||||
7395 | getLangOpts().ObjCAutoRefCount); | ||||
7396 | } | ||||
7397 | if (Candidate.Conversions[ArgIdx].isBad()) { | ||||
7398 | Candidate.Viable = false; | ||||
7399 | Candidate.FailureKind = ovl_fail_bad_conversion; | ||||
7400 | break; | ||||
7401 | } | ||||
7402 | } | ||||
7403 | } | ||||
7404 | |||||
7405 | namespace { | ||||
7406 | |||||
7407 | /// BuiltinCandidateTypeSet - A set of types that will be used for the | ||||
7408 | /// candidate operator functions for built-in operators (C++ | ||||
7409 | /// [over.built]). The types are separated into pointer types and | ||||
7410 | /// enumeration types. | ||||
7411 | class BuiltinCandidateTypeSet { | ||||
7412 | /// TypeSet - A set of types. | ||||
7413 | typedef llvm::SetVector<QualType, SmallVector<QualType, 8>, | ||||
7414 | llvm::SmallPtrSet<QualType, 8>> TypeSet; | ||||
7415 | |||||
7416 | /// PointerTypes - The set of pointer types that will be used in the | ||||
7417 | /// built-in candidates. | ||||
7418 | TypeSet PointerTypes; | ||||
7419 | |||||
7420 | /// MemberPointerTypes - The set of member pointer types that will be | ||||
7421 | /// used in the built-in candidates. | ||||
7422 | TypeSet MemberPointerTypes; | ||||
7423 | |||||
7424 | /// EnumerationTypes - The set of enumeration types that will be | ||||
7425 | /// used in the built-in candidates. | ||||
7426 | TypeSet EnumerationTypes; | ||||
7427 | |||||
7428 | /// The set of vector types that will be used in the built-in | ||||
7429 | /// candidates. | ||||
7430 | TypeSet VectorTypes; | ||||
7431 | |||||
7432 | /// A flag indicating non-record types are viable candidates | ||||
7433 | bool HasNonRecordTypes; | ||||
7434 | |||||
7435 | /// A flag indicating whether either arithmetic or enumeration types | ||||
7436 | /// were present in the candidate set. | ||||
7437 | bool HasArithmeticOrEnumeralTypes; | ||||
7438 | |||||
7439 | /// A flag indicating whether the nullptr type was present in the | ||||
7440 | /// candidate set. | ||||
7441 | bool HasNullPtrType; | ||||
7442 | |||||
7443 | /// Sema - The semantic analysis instance where we are building the | ||||
7444 | /// candidate type set. | ||||
7445 | Sema &SemaRef; | ||||
7446 | |||||
7447 | /// Context - The AST context in which we will build the type sets. | ||||
7448 | ASTContext &Context; | ||||
7449 | |||||
7450 | bool AddPointerWithMoreQualifiedTypeVariants(QualType Ty, | ||||
7451 | const Qualifiers &VisibleQuals); | ||||
7452 | bool AddMemberPointerWithMoreQualifiedTypeVariants(QualType Ty); | ||||
7453 | |||||
7454 | public: | ||||
7455 | /// iterator - Iterates through the types that are part of the set. | ||||
7456 | typedef TypeSet::iterator iterator; | ||||
7457 | |||||
7458 | BuiltinCandidateTypeSet(Sema &SemaRef) | ||||
7459 | : HasNonRecordTypes(false), | ||||
7460 | HasArithmeticOrEnumeralTypes(false), | ||||
7461 | HasNullPtrType(false), | ||||
7462 | SemaRef(SemaRef), | ||||
7463 | Context(SemaRef.Context) { } | ||||
7464 | |||||
7465 | void AddTypesConvertedFrom(QualType Ty, | ||||
7466 | SourceLocation Loc, | ||||
7467 | bool AllowUserConversions, | ||||
7468 | bool AllowExplicitConversions, | ||||
7469 | const Qualifiers &VisibleTypeConversionsQuals); | ||||
7470 | |||||
7471 | /// pointer_begin - First pointer type found; | ||||
7472 | iterator pointer_begin() { return PointerTypes.begin(); } | ||||
7473 | |||||
7474 | /// pointer_end - Past the last pointer type found; | ||||
7475 | iterator pointer_end() { return PointerTypes.end(); } | ||||
7476 | |||||
7477 | /// member_pointer_begin - First member pointer type found; | ||||
7478 | iterator member_pointer_begin() { return MemberPointerTypes.begin(); } | ||||
7479 | |||||
7480 | /// member_pointer_end - Past the last member pointer type found; | ||||
7481 | iterator member_pointer_end() { return MemberPointerTypes.end(); } | ||||
7482 | |||||
7483 | /// enumeration_begin - First enumeration type found; | ||||
7484 | iterator enumeration_begin() { return EnumerationTypes.begin(); } | ||||
7485 | |||||
7486 | /// enumeration_end - Past the last enumeration type found; | ||||
7487 | iterator enumeration_end() { return EnumerationTypes.end(); } | ||||
7488 | |||||
7489 | iterator vector_begin() { return VectorTypes.begin(); } | ||||
7490 | iterator vector_end() { return VectorTypes.end(); } | ||||
7491 | |||||
7492 | bool hasNonRecordTypes() { return HasNonRecordTypes; } | ||||
7493 | bool hasArithmeticOrEnumeralTypes() { return HasArithmeticOrEnumeralTypes; } | ||||
7494 | bool hasNullPtrType() const { return HasNullPtrType; } | ||||
7495 | }; | ||||
7496 | |||||
7497 | } // end anonymous namespace | ||||
7498 | |||||
7499 | /// AddPointerWithMoreQualifiedTypeVariants - Add the pointer type @p Ty to | ||||
7500 | /// the set of pointer types along with any more-qualified variants of | ||||
7501 | /// that type. For example, if @p Ty is "int const *", this routine | ||||
7502 | /// will add "int const *", "int const volatile *", "int const | ||||
7503 | /// restrict *", and "int const volatile restrict *" to the set of | ||||
7504 | /// pointer types. Returns true if the add of @p Ty itself succeeded, | ||||
7505 | /// false otherwise. | ||||
7506 | /// | ||||
7507 | /// FIXME: what to do about extended qualifiers? | ||||
7508 | bool | ||||
7509 | BuiltinCandidateTypeSet::AddPointerWithMoreQualifiedTypeVariants(QualType Ty, | ||||
7510 | const Qualifiers &VisibleQuals) { | ||||
7511 | |||||
7512 | // Insert this type. | ||||
7513 | if (!PointerTypes.insert(Ty)) | ||||
7514 | return false; | ||||
7515 | |||||
7516 | QualType PointeeTy; | ||||
7517 | const PointerType *PointerTy = Ty->getAs<PointerType>(); | ||||
7518 | bool buildObjCPtr = false; | ||||
7519 | if (!PointerTy) { | ||||
7520 | const ObjCObjectPointerType *PTy = Ty->castAs<ObjCObjectPointerType>(); | ||||
7521 | PointeeTy = PTy->getPointeeType(); | ||||
7522 | buildObjCPtr = true; | ||||
7523 | } else { | ||||
7524 | PointeeTy = PointerTy->getPointeeType(); | ||||
7525 | } | ||||
7526 | |||||
7527 | // Don't add qualified variants of arrays. For one, they're not allowed | ||||
7528 | // (the qualifier would sink to the element type), and for another, the | ||||
7529 | // only overload situation where it matters is subscript or pointer +- int, | ||||
7530 | // and those shouldn't have qualifier variants anyway. | ||||
7531 | if (PointeeTy->isArrayType()) | ||||
7532 | return true; | ||||
7533 | |||||
7534 | unsigned BaseCVR = PointeeTy.getCVRQualifiers(); | ||||
7535 | bool hasVolatile = VisibleQuals.hasVolatile(); | ||||
7536 | bool hasRestrict = VisibleQuals.hasRestrict(); | ||||
7537 | |||||
7538 | // Iterate through all strict supersets of BaseCVR. | ||||
7539 | for (unsigned CVR = BaseCVR+1; CVR <= Qualifiers::CVRMask; ++CVR) { | ||||
7540 | if ((CVR | BaseCVR) != CVR) continue; | ||||
7541 | // Skip over volatile if no volatile found anywhere in the types. | ||||
7542 | if ((CVR & Qualifiers::Volatile) && !hasVolatile) continue; | ||||
7543 | |||||
7544 | // Skip over restrict if no restrict found anywhere in the types, or if | ||||
7545 | // the type cannot be restrict-qualified. | ||||
7546 | if ((CVR & Qualifiers::Restrict) && | ||||
7547 | (!hasRestrict || | ||||
7548 | (!(PointeeTy->isAnyPointerType() || PointeeTy->isReferenceType())))) | ||||
7549 | continue; | ||||
7550 | |||||
7551 | // Build qualified pointee type. | ||||
7552 | QualType QPointeeTy = Context.getCVRQualifiedType(PointeeTy, CVR); | ||||
7553 | |||||
7554 | // Build qualified pointer type. | ||||
7555 | QualType QPointerTy; | ||||
7556 | if (!buildObjCPtr) | ||||
7557 | QPointerTy = Context.getPointerType(QPointeeTy); | ||||
7558 | else | ||||
7559 | QPointerTy = Context.getObjCObjectPointerType(QPointeeTy); | ||||
7560 | |||||
7561 | // Insert qualified pointer type. | ||||
7562 | PointerTypes.insert(QPointerTy); | ||||
7563 | } | ||||
7564 | |||||
7565 | return true; | ||||
7566 | } | ||||
7567 | |||||
7568 | /// AddMemberPointerWithMoreQualifiedTypeVariants - Add the pointer type @p Ty | ||||
7569 | /// to the set of pointer types along with any more-qualified variants of | ||||
7570 | /// that type. For example, if @p Ty is "int const *", this routine | ||||
7571 | /// will add "int const *", "int const volatile *", "int const | ||||
7572 | /// restrict *", and "int const volatile restrict *" to the set of | ||||
7573 | /// pointer types. Returns true if the add of @p Ty itself succeeded, | ||||
7574 | /// false otherwise. | ||||
7575 | /// | ||||
7576 | /// FIXME: what to do about extended qualifiers? | ||||
7577 | bool | ||||
7578 | BuiltinCandidateTypeSet::AddMemberPointerWithMoreQualifiedTypeVariants( | ||||
7579 | QualType Ty) { | ||||
7580 | // Insert this type. | ||||
7581 | if (!MemberPointerTypes.insert(Ty)) | ||||
7582 | return false; | ||||
7583 | |||||
7584 | const MemberPointerType *PointerTy = Ty->getAs<MemberPointerType>(); | ||||
7585 | assert(PointerTy && "type was not a member pointer type!")((PointerTy && "type was not a member pointer type!") ? static_cast<void> (0) : __assert_fail ("PointerTy && \"type was not a member pointer type!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7585, __PRETTY_FUNCTION__)); | ||||
7586 | |||||
7587 | QualType PointeeTy = PointerTy->getPointeeType(); | ||||
7588 | // Don't add qualified variants of arrays. For one, they're not allowed | ||||
7589 | // (the qualifier would sink to the element type), and for another, the | ||||
7590 | // only overload situation where it matters is subscript or pointer +- int, | ||||
7591 | // and those shouldn't have qualifier variants anyway. | ||||
7592 | if (PointeeTy->isArrayType()) | ||||
7593 | return true; | ||||
7594 | const Type *ClassTy = PointerTy->getClass(); | ||||
7595 | |||||
7596 | // Iterate through all strict supersets of the pointee type's CVR | ||||
7597 | // qualifiers. | ||||
7598 | unsigned BaseCVR = PointeeTy.getCVRQualifiers(); | ||||
7599 | for (unsigned CVR = BaseCVR+1; CVR <= Qualifiers::CVRMask; ++CVR) { | ||||
7600 | if ((CVR | BaseCVR) != CVR) continue; | ||||
7601 | |||||
7602 | QualType QPointeeTy = Context.getCVRQualifiedType(PointeeTy, CVR); | ||||
7603 | MemberPointerTypes.insert( | ||||
7604 | Context.getMemberPointerType(QPointeeTy, ClassTy)); | ||||
7605 | } | ||||
7606 | |||||
7607 | return true; | ||||
7608 | } | ||||
7609 | |||||
7610 | /// AddTypesConvertedFrom - Add each of the types to which the type @p | ||||
7611 | /// Ty can be implicit converted to the given set of @p Types. We're | ||||
7612 | /// primarily interested in pointer types and enumeration types. We also | ||||
7613 | /// take member pointer types, for the conditional operator. | ||||
7614 | /// AllowUserConversions is true if we should look at the conversion | ||||
7615 | /// functions of a class type, and AllowExplicitConversions if we | ||||
7616 | /// should also include the explicit conversion functions of a class | ||||
7617 | /// type. | ||||
7618 | void | ||||
7619 | BuiltinCandidateTypeSet::AddTypesConvertedFrom(QualType Ty, | ||||
7620 | SourceLocation Loc, | ||||
7621 | bool AllowUserConversions, | ||||
7622 | bool AllowExplicitConversions, | ||||
7623 | const Qualifiers &VisibleQuals) { | ||||
7624 | // Only deal with canonical types. | ||||
7625 | Ty = Context.getCanonicalType(Ty); | ||||
7626 | |||||
7627 | // Look through reference types; they aren't part of the type of an | ||||
7628 | // expression for the purposes of conversions. | ||||
7629 | if (const ReferenceType *RefTy = Ty->getAs<ReferenceType>()) | ||||
7630 | Ty = RefTy->getPointeeType(); | ||||
7631 | |||||
7632 | // If we're dealing with an array type, decay to the pointer. | ||||
7633 | if (Ty->isArrayType()) | ||||
7634 | Ty = SemaRef.Context.getArrayDecayedType(Ty); | ||||
7635 | |||||
7636 | // Otherwise, we don't care about qualifiers on the type. | ||||
7637 | Ty = Ty.getLocalUnqualifiedType(); | ||||
7638 | |||||
7639 | // Flag if we ever add a non-record type. | ||||
7640 | const RecordType *TyRec = Ty->getAs<RecordType>(); | ||||
7641 | HasNonRecordTypes = HasNonRecordTypes || !TyRec; | ||||
7642 | |||||
7643 | // Flag if we encounter an arithmetic type. | ||||
7644 | HasArithmeticOrEnumeralTypes = | ||||
7645 | HasArithmeticOrEnumeralTypes || Ty->isArithmeticType(); | ||||
7646 | |||||
7647 | if (Ty->isObjCIdType() || Ty->isObjCClassType()) | ||||
7648 | PointerTypes.insert(Ty); | ||||
7649 | else if (Ty->getAs<PointerType>() || Ty->getAs<ObjCObjectPointerType>()) { | ||||
7650 | // Insert our type, and its more-qualified variants, into the set | ||||
7651 | // of types. | ||||
7652 | if (!AddPointerWithMoreQualifiedTypeVariants(Ty, VisibleQuals)) | ||||
7653 | return; | ||||
7654 | } else if (Ty->isMemberPointerType()) { | ||||
7655 | // Member pointers are far easier, since the pointee can't be converted. | ||||
7656 | if (!AddMemberPointerWithMoreQualifiedTypeVariants(Ty)) | ||||
7657 | return; | ||||
7658 | } else if (Ty->isEnumeralType()) { | ||||
7659 | HasArithmeticOrEnumeralTypes = true; | ||||
7660 | EnumerationTypes.insert(Ty); | ||||
7661 | } else if (Ty->isVectorType()) { | ||||
7662 | // We treat vector types as arithmetic types in many contexts as an | ||||
7663 | // extension. | ||||
7664 | HasArithmeticOrEnumeralTypes = true; | ||||
7665 | VectorTypes.insert(Ty); | ||||
7666 | } else if (Ty->isNullPtrType()) { | ||||
7667 | HasNullPtrType = true; | ||||
7668 | } else if (AllowUserConversions && TyRec) { | ||||
7669 | // No conversion functions in incomplete types. | ||||
7670 | if (!SemaRef.isCompleteType(Loc, Ty)) | ||||
7671 | return; | ||||
7672 | |||||
7673 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(TyRec->getDecl()); | ||||
7674 | for (NamedDecl *D : ClassDecl->getVisibleConversionFunctions()) { | ||||
7675 | if (isa<UsingShadowDecl>(D)) | ||||
7676 | D = cast<UsingShadowDecl>(D)->getTargetDecl(); | ||||
7677 | |||||
7678 | // Skip conversion function templates; they don't tell us anything | ||||
7679 | // about which builtin types we can convert to. | ||||
7680 | if (isa<FunctionTemplateDecl>(D)) | ||||
7681 | continue; | ||||
7682 | |||||
7683 | CXXConversionDecl *Conv = cast<CXXConversionDecl>(D); | ||||
7684 | if (AllowExplicitConversions || !Conv->isExplicit()) { | ||||
7685 | AddTypesConvertedFrom(Conv->getConversionType(), Loc, false, false, | ||||
7686 | VisibleQuals); | ||||
7687 | } | ||||
7688 | } | ||||
7689 | } | ||||
7690 | } | ||||
7691 | /// Helper function for adjusting address spaces for the pointer or reference | ||||
7692 | /// operands of builtin operators depending on the argument. | ||||
7693 | static QualType AdjustAddressSpaceForBuiltinOperandType(Sema &S, QualType T, | ||||
7694 | Expr *Arg) { | ||||
7695 | return S.Context.getAddrSpaceQualType(T, Arg->getType().getAddressSpace()); | ||||
7696 | } | ||||
7697 | |||||
7698 | /// Helper function for AddBuiltinOperatorCandidates() that adds | ||||
7699 | /// the volatile- and non-volatile-qualified assignment operators for the | ||||
7700 | /// given type to the candidate set. | ||||
7701 | static void AddBuiltinAssignmentOperatorCandidates(Sema &S, | ||||
7702 | QualType T, | ||||
7703 | ArrayRef<Expr *> Args, | ||||
7704 | OverloadCandidateSet &CandidateSet) { | ||||
7705 | QualType ParamTypes[2]; | ||||
7706 | |||||
7707 | // T& operator=(T&, T) | ||||
7708 | ParamTypes[0] = S.Context.getLValueReferenceType( | ||||
7709 | AdjustAddressSpaceForBuiltinOperandType(S, T, Args[0])); | ||||
7710 | ParamTypes[1] = T; | ||||
7711 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
7712 | /*IsAssignmentOperator=*/true); | ||||
7713 | |||||
7714 | if (!S.Context.getCanonicalType(T).isVolatileQualified()) { | ||||
7715 | // volatile T& operator=(volatile T&, T) | ||||
7716 | ParamTypes[0] = S.Context.getLValueReferenceType( | ||||
7717 | AdjustAddressSpaceForBuiltinOperandType(S, S.Context.getVolatileType(T), | ||||
7718 | Args[0])); | ||||
7719 | ParamTypes[1] = T; | ||||
7720 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
7721 | /*IsAssignmentOperator=*/true); | ||||
7722 | } | ||||
7723 | } | ||||
7724 | |||||
7725 | /// CollectVRQualifiers - This routine returns Volatile/Restrict qualifiers, | ||||
7726 | /// if any, found in visible type conversion functions found in ArgExpr's type. | ||||
7727 | static Qualifiers CollectVRQualifiers(ASTContext &Context, Expr* ArgExpr) { | ||||
7728 | Qualifiers VRQuals; | ||||
7729 | const RecordType *TyRec; | ||||
7730 | if (const MemberPointerType *RHSMPType = | ||||
7731 | ArgExpr->getType()->getAs<MemberPointerType>()) | ||||
7732 | TyRec = RHSMPType->getClass()->getAs<RecordType>(); | ||||
7733 | else | ||||
7734 | TyRec = ArgExpr->getType()->getAs<RecordType>(); | ||||
7735 | if (!TyRec) { | ||||
7736 | // Just to be safe, assume the worst case. | ||||
7737 | VRQuals.addVolatile(); | ||||
7738 | VRQuals.addRestrict(); | ||||
7739 | return VRQuals; | ||||
7740 | } | ||||
7741 | |||||
7742 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(TyRec->getDecl()); | ||||
7743 | if (!ClassDecl->hasDefinition()) | ||||
7744 | return VRQuals; | ||||
7745 | |||||
7746 | for (NamedDecl *D : ClassDecl->getVisibleConversionFunctions()) { | ||||
7747 | if (isa<UsingShadowDecl>(D)) | ||||
7748 | D = cast<UsingShadowDecl>(D)->getTargetDecl(); | ||||
7749 | if (CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(D)) { | ||||
7750 | QualType CanTy = Context.getCanonicalType(Conv->getConversionType()); | ||||
7751 | if (const ReferenceType *ResTypeRef = CanTy->getAs<ReferenceType>()) | ||||
7752 | CanTy = ResTypeRef->getPointeeType(); | ||||
7753 | // Need to go down the pointer/mempointer chain and add qualifiers | ||||
7754 | // as see them. | ||||
7755 | bool done = false; | ||||
7756 | while (!done) { | ||||
7757 | if (CanTy.isRestrictQualified()) | ||||
7758 | VRQuals.addRestrict(); | ||||
7759 | if (const PointerType *ResTypePtr = CanTy->getAs<PointerType>()) | ||||
7760 | CanTy = ResTypePtr->getPointeeType(); | ||||
7761 | else if (const MemberPointerType *ResTypeMPtr = | ||||
7762 | CanTy->getAs<MemberPointerType>()) | ||||
7763 | CanTy = ResTypeMPtr->getPointeeType(); | ||||
7764 | else | ||||
7765 | done = true; | ||||
7766 | if (CanTy.isVolatileQualified()) | ||||
7767 | VRQuals.addVolatile(); | ||||
7768 | if (VRQuals.hasRestrict() && VRQuals.hasVolatile()) | ||||
7769 | return VRQuals; | ||||
7770 | } | ||||
7771 | } | ||||
7772 | } | ||||
7773 | return VRQuals; | ||||
7774 | } | ||||
7775 | |||||
7776 | namespace { | ||||
7777 | |||||
7778 | /// Helper class to manage the addition of builtin operator overload | ||||
7779 | /// candidates. It provides shared state and utility methods used throughout | ||||
7780 | /// the process, as well as a helper method to add each group of builtin | ||||
7781 | /// operator overloads from the standard to a candidate set. | ||||
7782 | class BuiltinOperatorOverloadBuilder { | ||||
7783 | // Common instance state available to all overload candidate addition methods. | ||||
7784 | Sema &S; | ||||
7785 | ArrayRef<Expr *> Args; | ||||
7786 | Qualifiers VisibleTypeConversionsQuals; | ||||
7787 | bool HasArithmeticOrEnumeralCandidateType; | ||||
7788 | SmallVectorImpl<BuiltinCandidateTypeSet> &CandidateTypes; | ||||
7789 | OverloadCandidateSet &CandidateSet; | ||||
7790 | |||||
7791 | static constexpr int ArithmeticTypesCap = 24; | ||||
7792 | SmallVector<CanQualType, ArithmeticTypesCap> ArithmeticTypes; | ||||
7793 | |||||
7794 | // Define some indices used to iterate over the arithmetic types in | ||||
7795 | // ArithmeticTypes. The "promoted arithmetic types" are the arithmetic | ||||
7796 | // types are that preserved by promotion (C++ [over.built]p2). | ||||
7797 | unsigned FirstIntegralType, | ||||
7798 | LastIntegralType; | ||||
7799 | unsigned FirstPromotedIntegralType, | ||||
7800 | LastPromotedIntegralType; | ||||
7801 | unsigned FirstPromotedArithmeticType, | ||||
7802 | LastPromotedArithmeticType; | ||||
7803 | unsigned NumArithmeticTypes; | ||||
7804 | |||||
7805 | void InitArithmeticTypes() { | ||||
7806 | // Start of promoted types. | ||||
7807 | FirstPromotedArithmeticType = 0; | ||||
7808 | ArithmeticTypes.push_back(S.Context.FloatTy); | ||||
7809 | ArithmeticTypes.push_back(S.Context.DoubleTy); | ||||
7810 | ArithmeticTypes.push_back(S.Context.LongDoubleTy); | ||||
7811 | if (S.Context.getTargetInfo().hasFloat128Type()) | ||||
7812 | ArithmeticTypes.push_back(S.Context.Float128Ty); | ||||
7813 | |||||
7814 | // Start of integral types. | ||||
7815 | FirstIntegralType = ArithmeticTypes.size(); | ||||
7816 | FirstPromotedIntegralType = ArithmeticTypes.size(); | ||||
7817 | ArithmeticTypes.push_back(S.Context.IntTy); | ||||
7818 | ArithmeticTypes.push_back(S.Context.LongTy); | ||||
7819 | ArithmeticTypes.push_back(S.Context.LongLongTy); | ||||
7820 | if (S.Context.getTargetInfo().hasInt128Type()) | ||||
7821 | ArithmeticTypes.push_back(S.Context.Int128Ty); | ||||
7822 | ArithmeticTypes.push_back(S.Context.UnsignedIntTy); | ||||
7823 | ArithmeticTypes.push_back(S.Context.UnsignedLongTy); | ||||
7824 | ArithmeticTypes.push_back(S.Context.UnsignedLongLongTy); | ||||
7825 | if (S.Context.getTargetInfo().hasInt128Type()) | ||||
7826 | ArithmeticTypes.push_back(S.Context.UnsignedInt128Ty); | ||||
7827 | LastPromotedIntegralType = ArithmeticTypes.size(); | ||||
7828 | LastPromotedArithmeticType = ArithmeticTypes.size(); | ||||
7829 | // End of promoted types. | ||||
7830 | |||||
7831 | ArithmeticTypes.push_back(S.Context.BoolTy); | ||||
7832 | ArithmeticTypes.push_back(S.Context.CharTy); | ||||
7833 | ArithmeticTypes.push_back(S.Context.WCharTy); | ||||
7834 | if (S.Context.getLangOpts().Char8) | ||||
7835 | ArithmeticTypes.push_back(S.Context.Char8Ty); | ||||
7836 | ArithmeticTypes.push_back(S.Context.Char16Ty); | ||||
7837 | ArithmeticTypes.push_back(S.Context.Char32Ty); | ||||
7838 | ArithmeticTypes.push_back(S.Context.SignedCharTy); | ||||
7839 | ArithmeticTypes.push_back(S.Context.ShortTy); | ||||
7840 | ArithmeticTypes.push_back(S.Context.UnsignedCharTy); | ||||
7841 | ArithmeticTypes.push_back(S.Context.UnsignedShortTy); | ||||
7842 | LastIntegralType = ArithmeticTypes.size(); | ||||
7843 | NumArithmeticTypes = ArithmeticTypes.size(); | ||||
7844 | // End of integral types. | ||||
7845 | // FIXME: What about complex? What about half? | ||||
7846 | |||||
7847 | assert(ArithmeticTypes.size() <= ArithmeticTypesCap &&((ArithmeticTypes.size() <= ArithmeticTypesCap && "Enough inline storage for all arithmetic types." ) ? static_cast<void> (0) : __assert_fail ("ArithmeticTypes.size() <= ArithmeticTypesCap && \"Enough inline storage for all arithmetic types.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7848, __PRETTY_FUNCTION__)) | ||||
7848 | "Enough inline storage for all arithmetic types.")((ArithmeticTypes.size() <= ArithmeticTypesCap && "Enough inline storage for all arithmetic types." ) ? static_cast<void> (0) : __assert_fail ("ArithmeticTypes.size() <= ArithmeticTypesCap && \"Enough inline storage for all arithmetic types.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 7848, __PRETTY_FUNCTION__)); | ||||
7849 | } | ||||
7850 | |||||
7851 | /// Helper method to factor out the common pattern of adding overloads | ||||
7852 | /// for '++' and '--' builtin operators. | ||||
7853 | void addPlusPlusMinusMinusStyleOverloads(QualType CandidateTy, | ||||
7854 | bool HasVolatile, | ||||
7855 | bool HasRestrict) { | ||||
7856 | QualType ParamTypes[2] = { | ||||
7857 | S.Context.getLValueReferenceType(CandidateTy), | ||||
7858 | S.Context.IntTy | ||||
7859 | }; | ||||
7860 | |||||
7861 | // Non-volatile version. | ||||
7862 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
7863 | |||||
7864 | // Use a heuristic to reduce number of builtin candidates in the set: | ||||
7865 | // add volatile version only if there are conversions to a volatile type. | ||||
7866 | if (HasVolatile) { | ||||
7867 | ParamTypes[0] = | ||||
7868 | S.Context.getLValueReferenceType( | ||||
7869 | S.Context.getVolatileType(CandidateTy)); | ||||
7870 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
7871 | } | ||||
7872 | |||||
7873 | // Add restrict version only if there are conversions to a restrict type | ||||
7874 | // and our candidate type is a non-restrict-qualified pointer. | ||||
7875 | if (HasRestrict && CandidateTy->isAnyPointerType() && | ||||
7876 | !CandidateTy.isRestrictQualified()) { | ||||
7877 | ParamTypes[0] | ||||
7878 | = S.Context.getLValueReferenceType( | ||||
7879 | S.Context.getCVRQualifiedType(CandidateTy, Qualifiers::Restrict)); | ||||
7880 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
7881 | |||||
7882 | if (HasVolatile) { | ||||
7883 | ParamTypes[0] | ||||
7884 | = S.Context.getLValueReferenceType( | ||||
7885 | S.Context.getCVRQualifiedType(CandidateTy, | ||||
7886 | (Qualifiers::Volatile | | ||||
7887 | Qualifiers::Restrict))); | ||||
7888 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
7889 | } | ||||
7890 | } | ||||
7891 | |||||
7892 | } | ||||
7893 | |||||
7894 | public: | ||||
7895 | BuiltinOperatorOverloadBuilder( | ||||
7896 | Sema &S, ArrayRef<Expr *> Args, | ||||
7897 | Qualifiers VisibleTypeConversionsQuals, | ||||
7898 | bool HasArithmeticOrEnumeralCandidateType, | ||||
7899 | SmallVectorImpl<BuiltinCandidateTypeSet> &CandidateTypes, | ||||
7900 | OverloadCandidateSet &CandidateSet) | ||||
7901 | : S(S), Args(Args), | ||||
7902 | VisibleTypeConversionsQuals(VisibleTypeConversionsQuals), | ||||
7903 | HasArithmeticOrEnumeralCandidateType( | ||||
7904 | HasArithmeticOrEnumeralCandidateType), | ||||
7905 | CandidateTypes(CandidateTypes), | ||||
7906 | CandidateSet(CandidateSet) { | ||||
7907 | |||||
7908 | InitArithmeticTypes(); | ||||
7909 | } | ||||
7910 | |||||
7911 | // Increment is deprecated for bool since C++17. | ||||
7912 | // | ||||
7913 | // C++ [over.built]p3: | ||||
7914 | // | ||||
7915 | // For every pair (T, VQ), where T is an arithmetic type other | ||||
7916 | // than bool, and VQ is either volatile or empty, there exist | ||||
7917 | // candidate operator functions of the form | ||||
7918 | // | ||||
7919 | // VQ T& operator++(VQ T&); | ||||
7920 | // T operator++(VQ T&, int); | ||||
7921 | // | ||||
7922 | // C++ [over.built]p4: | ||||
7923 | // | ||||
7924 | // For every pair (T, VQ), where T is an arithmetic type other | ||||
7925 | // than bool, and VQ is either volatile or empty, there exist | ||||
7926 | // candidate operator functions of the form | ||||
7927 | // | ||||
7928 | // VQ T& operator--(VQ T&); | ||||
7929 | // T operator--(VQ T&, int); | ||||
7930 | void addPlusPlusMinusMinusArithmeticOverloads(OverloadedOperatorKind Op) { | ||||
7931 | if (!HasArithmeticOrEnumeralCandidateType) | ||||
7932 | return; | ||||
7933 | |||||
7934 | for (unsigned Arith = 0; Arith < NumArithmeticTypes; ++Arith) { | ||||
7935 | const auto TypeOfT = ArithmeticTypes[Arith]; | ||||
7936 | if (TypeOfT == S.Context.BoolTy) { | ||||
7937 | if (Op == OO_MinusMinus) | ||||
7938 | continue; | ||||
7939 | if (Op == OO_PlusPlus && S.getLangOpts().CPlusPlus17) | ||||
7940 | continue; | ||||
7941 | } | ||||
7942 | addPlusPlusMinusMinusStyleOverloads( | ||||
7943 | TypeOfT, | ||||
7944 | VisibleTypeConversionsQuals.hasVolatile(), | ||||
7945 | VisibleTypeConversionsQuals.hasRestrict()); | ||||
7946 | } | ||||
7947 | } | ||||
7948 | |||||
7949 | // C++ [over.built]p5: | ||||
7950 | // | ||||
7951 | // For every pair (T, VQ), where T is a cv-qualified or | ||||
7952 | // cv-unqualified object type, and VQ is either volatile or | ||||
7953 | // empty, there exist candidate operator functions of the form | ||||
7954 | // | ||||
7955 | // T*VQ& operator++(T*VQ&); | ||||
7956 | // T*VQ& operator--(T*VQ&); | ||||
7957 | // T* operator++(T*VQ&, int); | ||||
7958 | // T* operator--(T*VQ&, int); | ||||
7959 | void addPlusPlusMinusMinusPointerOverloads() { | ||||
7960 | for (BuiltinCandidateTypeSet::iterator | ||||
7961 | Ptr = CandidateTypes[0].pointer_begin(), | ||||
7962 | PtrEnd = CandidateTypes[0].pointer_end(); | ||||
7963 | Ptr != PtrEnd; ++Ptr) { | ||||
7964 | // Skip pointer types that aren't pointers to object types. | ||||
7965 | if (!(*Ptr)->getPointeeType()->isObjectType()) | ||||
7966 | continue; | ||||
7967 | |||||
7968 | addPlusPlusMinusMinusStyleOverloads(*Ptr, | ||||
7969 | (!(*Ptr).isVolatileQualified() && | ||||
7970 | VisibleTypeConversionsQuals.hasVolatile()), | ||||
7971 | (!(*Ptr).isRestrictQualified() && | ||||
7972 | VisibleTypeConversionsQuals.hasRestrict())); | ||||
7973 | } | ||||
7974 | } | ||||
7975 | |||||
7976 | // C++ [over.built]p6: | ||||
7977 | // For every cv-qualified or cv-unqualified object type T, there | ||||
7978 | // exist candidate operator functions of the form | ||||
7979 | // | ||||
7980 | // T& operator*(T*); | ||||
7981 | // | ||||
7982 | // C++ [over.built]p7: | ||||
7983 | // For every function type T that does not have cv-qualifiers or a | ||||
7984 | // ref-qualifier, there exist candidate operator functions of the form | ||||
7985 | // T& operator*(T*); | ||||
7986 | void addUnaryStarPointerOverloads() { | ||||
7987 | for (BuiltinCandidateTypeSet::iterator | ||||
7988 | Ptr = CandidateTypes[0].pointer_begin(), | ||||
7989 | PtrEnd = CandidateTypes[0].pointer_end(); | ||||
7990 | Ptr != PtrEnd; ++Ptr) { | ||||
7991 | QualType ParamTy = *Ptr; | ||||
7992 | QualType PointeeTy = ParamTy->getPointeeType(); | ||||
7993 | if (!PointeeTy->isObjectType() && !PointeeTy->isFunctionType()) | ||||
7994 | continue; | ||||
7995 | |||||
7996 | if (const FunctionProtoType *Proto =PointeeTy->getAs<FunctionProtoType>()) | ||||
7997 | if (Proto->getMethodQuals() || Proto->getRefQualifier()) | ||||
7998 | continue; | ||||
7999 | |||||
8000 | S.AddBuiltinCandidate(&ParamTy, Args, CandidateSet); | ||||
8001 | } | ||||
8002 | } | ||||
8003 | |||||
8004 | // C++ [over.built]p9: | ||||
8005 | // For every promoted arithmetic type T, there exist candidate | ||||
8006 | // operator functions of the form | ||||
8007 | // | ||||
8008 | // T operator+(T); | ||||
8009 | // T operator-(T); | ||||
8010 | void addUnaryPlusOrMinusArithmeticOverloads() { | ||||
8011 | if (!HasArithmeticOrEnumeralCandidateType) | ||||
8012 | return; | ||||
8013 | |||||
8014 | for (unsigned Arith = FirstPromotedArithmeticType; | ||||
8015 | Arith < LastPromotedArithmeticType; ++Arith) { | ||||
8016 | QualType ArithTy = ArithmeticTypes[Arith]; | ||||
8017 | S.AddBuiltinCandidate(&ArithTy, Args, CandidateSet); | ||||
8018 | } | ||||
8019 | |||||
8020 | // Extension: We also add these operators for vector types. | ||||
8021 | for (BuiltinCandidateTypeSet::iterator | ||||
8022 | Vec = CandidateTypes[0].vector_begin(), | ||||
8023 | VecEnd = CandidateTypes[0].vector_end(); | ||||
8024 | Vec != VecEnd; ++Vec) { | ||||
8025 | QualType VecTy = *Vec; | ||||
8026 | S.AddBuiltinCandidate(&VecTy, Args, CandidateSet); | ||||
8027 | } | ||||
8028 | } | ||||
8029 | |||||
8030 | // C++ [over.built]p8: | ||||
8031 | // For every type T, there exist candidate operator functions of | ||||
8032 | // the form | ||||
8033 | // | ||||
8034 | // T* operator+(T*); | ||||
8035 | void addUnaryPlusPointerOverloads() { | ||||
8036 | for (BuiltinCandidateTypeSet::iterator | ||||
8037 | Ptr = CandidateTypes[0].pointer_begin(), | ||||
8038 | PtrEnd = CandidateTypes[0].pointer_end(); | ||||
8039 | Ptr != PtrEnd; ++Ptr) { | ||||
8040 | QualType ParamTy = *Ptr; | ||||
8041 | S.AddBuiltinCandidate(&ParamTy, Args, CandidateSet); | ||||
8042 | } | ||||
8043 | } | ||||
8044 | |||||
8045 | // C++ [over.built]p10: | ||||
8046 | // For every promoted integral type T, there exist candidate | ||||
8047 | // operator functions of the form | ||||
8048 | // | ||||
8049 | // T operator~(T); | ||||
8050 | void addUnaryTildePromotedIntegralOverloads() { | ||||
8051 | if (!HasArithmeticOrEnumeralCandidateType) | ||||
8052 | return; | ||||
8053 | |||||
8054 | for (unsigned Int = FirstPromotedIntegralType; | ||||
8055 | Int < LastPromotedIntegralType; ++Int) { | ||||
8056 | QualType IntTy = ArithmeticTypes[Int]; | ||||
8057 | S.AddBuiltinCandidate(&IntTy, Args, CandidateSet); | ||||
8058 | } | ||||
8059 | |||||
8060 | // Extension: We also add this operator for vector types. | ||||
8061 | for (BuiltinCandidateTypeSet::iterator | ||||
8062 | Vec = CandidateTypes[0].vector_begin(), | ||||
8063 | VecEnd = CandidateTypes[0].vector_end(); | ||||
8064 | Vec != VecEnd; ++Vec) { | ||||
8065 | QualType VecTy = *Vec; | ||||
8066 | S.AddBuiltinCandidate(&VecTy, Args, CandidateSet); | ||||
8067 | } | ||||
8068 | } | ||||
8069 | |||||
8070 | // C++ [over.match.oper]p16: | ||||
8071 | // For every pointer to member type T or type std::nullptr_t, there | ||||
8072 | // exist candidate operator functions of the form | ||||
8073 | // | ||||
8074 | // bool operator==(T,T); | ||||
8075 | // bool operator!=(T,T); | ||||
8076 | void addEqualEqualOrNotEqualMemberPointerOrNullptrOverloads() { | ||||
8077 | /// Set of (canonical) types that we've already handled. | ||||
8078 | llvm::SmallPtrSet<QualType, 8> AddedTypes; | ||||
8079 | |||||
8080 | for (unsigned ArgIdx = 0, N = Args.size(); ArgIdx != N; ++ArgIdx) { | ||||
8081 | for (BuiltinCandidateTypeSet::iterator | ||||
8082 | MemPtr = CandidateTypes[ArgIdx].member_pointer_begin(), | ||||
8083 | MemPtrEnd = CandidateTypes[ArgIdx].member_pointer_end(); | ||||
8084 | MemPtr != MemPtrEnd; | ||||
8085 | ++MemPtr) { | ||||
8086 | // Don't add the same builtin candidate twice. | ||||
8087 | if (!AddedTypes.insert(S.Context.getCanonicalType(*MemPtr)).second) | ||||
8088 | continue; | ||||
8089 | |||||
8090 | QualType ParamTypes[2] = { *MemPtr, *MemPtr }; | ||||
8091 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8092 | } | ||||
8093 | |||||
8094 | if (CandidateTypes[ArgIdx].hasNullPtrType()) { | ||||
8095 | CanQualType NullPtrTy = S.Context.getCanonicalType(S.Context.NullPtrTy); | ||||
8096 | if (AddedTypes.insert(NullPtrTy).second) { | ||||
8097 | QualType ParamTypes[2] = { NullPtrTy, NullPtrTy }; | ||||
8098 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8099 | } | ||||
8100 | } | ||||
8101 | } | ||||
8102 | } | ||||
8103 | |||||
8104 | // C++ [over.built]p15: | ||||
8105 | // | ||||
8106 | // For every T, where T is an enumeration type or a pointer type, | ||||
8107 | // there exist candidate operator functions of the form | ||||
8108 | // | ||||
8109 | // bool operator<(T, T); | ||||
8110 | // bool operator>(T, T); | ||||
8111 | // bool operator<=(T, T); | ||||
8112 | // bool operator>=(T, T); | ||||
8113 | // bool operator==(T, T); | ||||
8114 | // bool operator!=(T, T); | ||||
8115 | // R operator<=>(T, T) | ||||
8116 | void addGenericBinaryPointerOrEnumeralOverloads() { | ||||
8117 | // C++ [over.match.oper]p3: | ||||
8118 | // [...]the built-in candidates include all of the candidate operator | ||||
8119 | // functions defined in 13.6 that, compared to the given operator, [...] | ||||
8120 | // do not have the same parameter-type-list as any non-template non-member | ||||
8121 | // candidate. | ||||
8122 | // | ||||
8123 | // Note that in practice, this only affects enumeration types because there | ||||
8124 | // aren't any built-in candidates of record type, and a user-defined operator | ||||
8125 | // must have an operand of record or enumeration type. Also, the only other | ||||
8126 | // overloaded operator with enumeration arguments, operator=, | ||||
8127 | // cannot be overloaded for enumeration types, so this is the only place | ||||
8128 | // where we must suppress candidates like this. | ||||
8129 | llvm::DenseSet<std::pair<CanQualType, CanQualType> > | ||||
8130 | UserDefinedBinaryOperators; | ||||
8131 | |||||
8132 | for (unsigned ArgIdx = 0, N = Args.size(); ArgIdx != N; ++ArgIdx) { | ||||
8133 | if (CandidateTypes[ArgIdx].enumeration_begin() != | ||||
8134 | CandidateTypes[ArgIdx].enumeration_end()) { | ||||
8135 | for (OverloadCandidateSet::iterator C = CandidateSet.begin(), | ||||
8136 | CEnd = CandidateSet.end(); | ||||
8137 | C != CEnd; ++C) { | ||||
8138 | if (!C->Viable || !C->Function || C->Function->getNumParams() != 2) | ||||
8139 | continue; | ||||
8140 | |||||
8141 | if (C->Function->isFunctionTemplateSpecialization()) | ||||
8142 | continue; | ||||
8143 | |||||
8144 | QualType FirstParamType = | ||||
8145 | C->Function->getParamDecl(0)->getType().getUnqualifiedType(); | ||||
8146 | QualType SecondParamType = | ||||
8147 | C->Function->getParamDecl(1)->getType().getUnqualifiedType(); | ||||
8148 | |||||
8149 | // Skip if either parameter isn't of enumeral type. | ||||
8150 | if (!FirstParamType->isEnumeralType() || | ||||
8151 | !SecondParamType->isEnumeralType()) | ||||
8152 | continue; | ||||
8153 | |||||
8154 | // Add this operator to the set of known user-defined operators. | ||||
8155 | UserDefinedBinaryOperators.insert( | ||||
8156 | std::make_pair(S.Context.getCanonicalType(FirstParamType), | ||||
8157 | S.Context.getCanonicalType(SecondParamType))); | ||||
8158 | } | ||||
8159 | } | ||||
8160 | } | ||||
8161 | |||||
8162 | /// Set of (canonical) types that we've already handled. | ||||
8163 | llvm::SmallPtrSet<QualType, 8> AddedTypes; | ||||
8164 | |||||
8165 | for (unsigned ArgIdx = 0, N = Args.size(); ArgIdx != N; ++ArgIdx) { | ||||
8166 | for (BuiltinCandidateTypeSet::iterator | ||||
8167 | Ptr = CandidateTypes[ArgIdx].pointer_begin(), | ||||
8168 | PtrEnd = CandidateTypes[ArgIdx].pointer_end(); | ||||
8169 | Ptr != PtrEnd; ++Ptr) { | ||||
8170 | // Don't add the same builtin candidate twice. | ||||
8171 | if (!AddedTypes.insert(S.Context.getCanonicalType(*Ptr)).second) | ||||
8172 | continue; | ||||
8173 | |||||
8174 | QualType ParamTypes[2] = { *Ptr, *Ptr }; | ||||
8175 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8176 | } | ||||
8177 | for (BuiltinCandidateTypeSet::iterator | ||||
8178 | Enum = CandidateTypes[ArgIdx].enumeration_begin(), | ||||
8179 | EnumEnd = CandidateTypes[ArgIdx].enumeration_end(); | ||||
8180 | Enum != EnumEnd; ++Enum) { | ||||
8181 | CanQualType CanonType = S.Context.getCanonicalType(*Enum); | ||||
8182 | |||||
8183 | // Don't add the same builtin candidate twice, or if a user defined | ||||
8184 | // candidate exists. | ||||
8185 | if (!AddedTypes.insert(CanonType).second || | ||||
8186 | UserDefinedBinaryOperators.count(std::make_pair(CanonType, | ||||
8187 | CanonType))) | ||||
8188 | continue; | ||||
8189 | QualType ParamTypes[2] = { *Enum, *Enum }; | ||||
8190 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8191 | } | ||||
8192 | } | ||||
8193 | } | ||||
8194 | |||||
8195 | // C++ [over.built]p13: | ||||
8196 | // | ||||
8197 | // For every cv-qualified or cv-unqualified object type T | ||||
8198 | // there exist candidate operator functions of the form | ||||
8199 | // | ||||
8200 | // T* operator+(T*, ptrdiff_t); | ||||
8201 | // T& operator[](T*, ptrdiff_t); [BELOW] | ||||
8202 | // T* operator-(T*, ptrdiff_t); | ||||
8203 | // T* operator+(ptrdiff_t, T*); | ||||
8204 | // T& operator[](ptrdiff_t, T*); [BELOW] | ||||
8205 | // | ||||
8206 | // C++ [over.built]p14: | ||||
8207 | // | ||||
8208 | // For every T, where T is a pointer to object type, there | ||||
8209 | // exist candidate operator functions of the form | ||||
8210 | // | ||||
8211 | // ptrdiff_t operator-(T, T); | ||||
8212 | void addBinaryPlusOrMinusPointerOverloads(OverloadedOperatorKind Op) { | ||||
8213 | /// Set of (canonical) types that we've already handled. | ||||
8214 | llvm::SmallPtrSet<QualType, 8> AddedTypes; | ||||
8215 | |||||
8216 | for (int Arg = 0; Arg < 2; ++Arg) { | ||||
8217 | QualType AsymmetricParamTypes[2] = { | ||||
8218 | S.Context.getPointerDiffType(), | ||||
8219 | S.Context.getPointerDiffType(), | ||||
8220 | }; | ||||
8221 | for (BuiltinCandidateTypeSet::iterator | ||||
8222 | Ptr = CandidateTypes[Arg].pointer_begin(), | ||||
8223 | PtrEnd = CandidateTypes[Arg].pointer_end(); | ||||
8224 | Ptr != PtrEnd; ++Ptr) { | ||||
8225 | QualType PointeeTy = (*Ptr)->getPointeeType(); | ||||
8226 | if (!PointeeTy->isObjectType()) | ||||
8227 | continue; | ||||
8228 | |||||
8229 | AsymmetricParamTypes[Arg] = *Ptr; | ||||
8230 | if (Arg == 0 || Op == OO_Plus) { | ||||
8231 | // operator+(T*, ptrdiff_t) or operator-(T*, ptrdiff_t) | ||||
8232 | // T* operator+(ptrdiff_t, T*); | ||||
8233 | S.AddBuiltinCandidate(AsymmetricParamTypes, Args, CandidateSet); | ||||
8234 | } | ||||
8235 | if (Op == OO_Minus) { | ||||
8236 | // ptrdiff_t operator-(T, T); | ||||
8237 | if (!AddedTypes.insert(S.Context.getCanonicalType(*Ptr)).second) | ||||
8238 | continue; | ||||
8239 | |||||
8240 | QualType ParamTypes[2] = { *Ptr, *Ptr }; | ||||
8241 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8242 | } | ||||
8243 | } | ||||
8244 | } | ||||
8245 | } | ||||
8246 | |||||
8247 | // C++ [over.built]p12: | ||||
8248 | // | ||||
8249 | // For every pair of promoted arithmetic types L and R, there | ||||
8250 | // exist candidate operator functions of the form | ||||
8251 | // | ||||
8252 | // LR operator*(L, R); | ||||
8253 | // LR operator/(L, R); | ||||
8254 | // LR operator+(L, R); | ||||
8255 | // LR operator-(L, R); | ||||
8256 | // bool operator<(L, R); | ||||
8257 | // bool operator>(L, R); | ||||
8258 | // bool operator<=(L, R); | ||||
8259 | // bool operator>=(L, R); | ||||
8260 | // bool operator==(L, R); | ||||
8261 | // bool operator!=(L, R); | ||||
8262 | // | ||||
8263 | // where LR is the result of the usual arithmetic conversions | ||||
8264 | // between types L and R. | ||||
8265 | // | ||||
8266 | // C++ [over.built]p24: | ||||
8267 | // | ||||
8268 | // For every pair of promoted arithmetic types L and R, there exist | ||||
8269 | // candidate operator functions of the form | ||||
8270 | // | ||||
8271 | // LR operator?(bool, L, R); | ||||
8272 | // | ||||
8273 | // where LR is the result of the usual arithmetic conversions | ||||
8274 | // between types L and R. | ||||
8275 | // Our candidates ignore the first parameter. | ||||
8276 | void addGenericBinaryArithmeticOverloads() { | ||||
8277 | if (!HasArithmeticOrEnumeralCandidateType) | ||||
8278 | return; | ||||
8279 | |||||
8280 | for (unsigned Left = FirstPromotedArithmeticType; | ||||
8281 | Left < LastPromotedArithmeticType; ++Left) { | ||||
8282 | for (unsigned Right = FirstPromotedArithmeticType; | ||||
8283 | Right < LastPromotedArithmeticType; ++Right) { | ||||
8284 | QualType LandR[2] = { ArithmeticTypes[Left], | ||||
8285 | ArithmeticTypes[Right] }; | ||||
8286 | S.AddBuiltinCandidate(LandR, Args, CandidateSet); | ||||
8287 | } | ||||
8288 | } | ||||
8289 | |||||
8290 | // Extension: Add the binary operators ==, !=, <, <=, >=, >, *, /, and the | ||||
8291 | // conditional operator for vector types. | ||||
8292 | for (BuiltinCandidateTypeSet::iterator | ||||
8293 | Vec1 = CandidateTypes[0].vector_begin(), | ||||
8294 | Vec1End = CandidateTypes[0].vector_end(); | ||||
8295 | Vec1 != Vec1End; ++Vec1) { | ||||
8296 | for (BuiltinCandidateTypeSet::iterator | ||||
8297 | Vec2 = CandidateTypes[1].vector_begin(), | ||||
8298 | Vec2End = CandidateTypes[1].vector_end(); | ||||
8299 | Vec2 != Vec2End; ++Vec2) { | ||||
8300 | QualType LandR[2] = { *Vec1, *Vec2 }; | ||||
8301 | S.AddBuiltinCandidate(LandR, Args, CandidateSet); | ||||
8302 | } | ||||
8303 | } | ||||
8304 | } | ||||
8305 | |||||
8306 | // C++2a [over.built]p14: | ||||
8307 | // | ||||
8308 | // For every integral type T there exists a candidate operator function | ||||
8309 | // of the form | ||||
8310 | // | ||||
8311 | // std::strong_ordering operator<=>(T, T) | ||||
8312 | // | ||||
8313 | // C++2a [over.built]p15: | ||||
8314 | // | ||||
8315 | // For every pair of floating-point types L and R, there exists a candidate | ||||
8316 | // operator function of the form | ||||
8317 | // | ||||
8318 | // std::partial_ordering operator<=>(L, R); | ||||
8319 | // | ||||
8320 | // FIXME: The current specification for integral types doesn't play nice with | ||||
8321 | // the direction of p0946r0, which allows mixed integral and unscoped-enum | ||||
8322 | // comparisons. Under the current spec this can lead to ambiguity during | ||||
8323 | // overload resolution. For example: | ||||
8324 | // | ||||
8325 | // enum A : int {a}; | ||||
8326 | // auto x = (a <=> (long)42); | ||||
8327 | // | ||||
8328 | // error: call is ambiguous for arguments 'A' and 'long'. | ||||
8329 | // note: candidate operator<=>(int, int) | ||||
8330 | // note: candidate operator<=>(long, long) | ||||
8331 | // | ||||
8332 | // To avoid this error, this function deviates from the specification and adds | ||||
8333 | // the mixed overloads `operator<=>(L, R)` where L and R are promoted | ||||
8334 | // arithmetic types (the same as the generic relational overloads). | ||||
8335 | // | ||||
8336 | // For now this function acts as a placeholder. | ||||
8337 | void addThreeWayArithmeticOverloads() { | ||||
8338 | addGenericBinaryArithmeticOverloads(); | ||||
8339 | } | ||||
8340 | |||||
8341 | // C++ [over.built]p17: | ||||
8342 | // | ||||
8343 | // For every pair of promoted integral types L and R, there | ||||
8344 | // exist candidate operator functions of the form | ||||
8345 | // | ||||
8346 | // LR operator%(L, R); | ||||
8347 | // LR operator&(L, R); | ||||
8348 | // LR operator^(L, R); | ||||
8349 | // LR operator|(L, R); | ||||
8350 | // L operator<<(L, R); | ||||
8351 | // L operator>>(L, R); | ||||
8352 | // | ||||
8353 | // where LR is the result of the usual arithmetic conversions | ||||
8354 | // between types L and R. | ||||
8355 | void addBinaryBitwiseArithmeticOverloads(OverloadedOperatorKind Op) { | ||||
8356 | if (!HasArithmeticOrEnumeralCandidateType) | ||||
8357 | return; | ||||
8358 | |||||
8359 | for (unsigned Left = FirstPromotedIntegralType; | ||||
8360 | Left < LastPromotedIntegralType; ++Left) { | ||||
8361 | for (unsigned Right = FirstPromotedIntegralType; | ||||
8362 | Right < LastPromotedIntegralType; ++Right) { | ||||
8363 | QualType LandR[2] = { ArithmeticTypes[Left], | ||||
8364 | ArithmeticTypes[Right] }; | ||||
8365 | S.AddBuiltinCandidate(LandR, Args, CandidateSet); | ||||
8366 | } | ||||
8367 | } | ||||
8368 | } | ||||
8369 | |||||
8370 | // C++ [over.built]p20: | ||||
8371 | // | ||||
8372 | // For every pair (T, VQ), where T is an enumeration or | ||||
8373 | // pointer to member type and VQ is either volatile or | ||||
8374 | // empty, there exist candidate operator functions of the form | ||||
8375 | // | ||||
8376 | // VQ T& operator=(VQ T&, T); | ||||
8377 | void addAssignmentMemberPointerOrEnumeralOverloads() { | ||||
8378 | /// Set of (canonical) types that we've already handled. | ||||
8379 | llvm::SmallPtrSet<QualType, 8> AddedTypes; | ||||
8380 | |||||
8381 | for (unsigned ArgIdx = 0; ArgIdx < 2; ++ArgIdx) { | ||||
8382 | for (BuiltinCandidateTypeSet::iterator | ||||
8383 | Enum = CandidateTypes[ArgIdx].enumeration_begin(), | ||||
8384 | EnumEnd = CandidateTypes[ArgIdx].enumeration_end(); | ||||
8385 | Enum != EnumEnd; ++Enum) { | ||||
8386 | if (!AddedTypes.insert(S.Context.getCanonicalType(*Enum)).second) | ||||
8387 | continue; | ||||
8388 | |||||
8389 | AddBuiltinAssignmentOperatorCandidates(S, *Enum, Args, CandidateSet); | ||||
8390 | } | ||||
8391 | |||||
8392 | for (BuiltinCandidateTypeSet::iterator | ||||
8393 | MemPtr = CandidateTypes[ArgIdx].member_pointer_begin(), | ||||
8394 | MemPtrEnd = CandidateTypes[ArgIdx].member_pointer_end(); | ||||
8395 | MemPtr != MemPtrEnd; ++MemPtr) { | ||||
8396 | if (!AddedTypes.insert(S.Context.getCanonicalType(*MemPtr)).second) | ||||
8397 | continue; | ||||
8398 | |||||
8399 | AddBuiltinAssignmentOperatorCandidates(S, *MemPtr, Args, CandidateSet); | ||||
8400 | } | ||||
8401 | } | ||||
8402 | } | ||||
8403 | |||||
8404 | // C++ [over.built]p19: | ||||
8405 | // | ||||
8406 | // For every pair (T, VQ), where T is any type and VQ is either | ||||
8407 | // volatile or empty, there exist candidate operator functions | ||||
8408 | // of the form | ||||
8409 | // | ||||
8410 | // T*VQ& operator=(T*VQ&, T*); | ||||
8411 | // | ||||
8412 | // C++ [over.built]p21: | ||||
8413 | // | ||||
8414 | // For every pair (T, VQ), where T is a cv-qualified or | ||||
8415 | // cv-unqualified object type and VQ is either volatile or | ||||
8416 | // empty, there exist candidate operator functions of the form | ||||
8417 | // | ||||
8418 | // T*VQ& operator+=(T*VQ&, ptrdiff_t); | ||||
8419 | // T*VQ& operator-=(T*VQ&, ptrdiff_t); | ||||
8420 | void addAssignmentPointerOverloads(bool isEqualOp) { | ||||
8421 | /// Set of (canonical) types that we've already handled. | ||||
8422 | llvm::SmallPtrSet<QualType, 8> AddedTypes; | ||||
8423 | |||||
8424 | for (BuiltinCandidateTypeSet::iterator | ||||
8425 | Ptr = CandidateTypes[0].pointer_begin(), | ||||
8426 | PtrEnd = CandidateTypes[0].pointer_end(); | ||||
8427 | Ptr != PtrEnd; ++Ptr) { | ||||
8428 | // If this is operator=, keep track of the builtin candidates we added. | ||||
8429 | if (isEqualOp) | ||||
8430 | AddedTypes.insert(S.Context.getCanonicalType(*Ptr)); | ||||
8431 | else if (!(*Ptr)->getPointeeType()->isObjectType()) | ||||
8432 | continue; | ||||
8433 | |||||
8434 | // non-volatile version | ||||
8435 | QualType ParamTypes[2] = { | ||||
8436 | S.Context.getLValueReferenceType(*Ptr), | ||||
8437 | isEqualOp ? *Ptr : S.Context.getPointerDiffType(), | ||||
8438 | }; | ||||
8439 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8440 | /*IsAssignmentOperator=*/ isEqualOp); | ||||
8441 | |||||
8442 | bool NeedVolatile = !(*Ptr).isVolatileQualified() && | ||||
8443 | VisibleTypeConversionsQuals.hasVolatile(); | ||||
8444 | if (NeedVolatile) { | ||||
8445 | // volatile version | ||||
8446 | ParamTypes[0] = | ||||
8447 | S.Context.getLValueReferenceType(S.Context.getVolatileType(*Ptr)); | ||||
8448 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8449 | /*IsAssignmentOperator=*/isEqualOp); | ||||
8450 | } | ||||
8451 | |||||
8452 | if (!(*Ptr).isRestrictQualified() && | ||||
8453 | VisibleTypeConversionsQuals.hasRestrict()) { | ||||
8454 | // restrict version | ||||
8455 | ParamTypes[0] | ||||
8456 | = S.Context.getLValueReferenceType(S.Context.getRestrictType(*Ptr)); | ||||
8457 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8458 | /*IsAssignmentOperator=*/isEqualOp); | ||||
8459 | |||||
8460 | if (NeedVolatile) { | ||||
8461 | // volatile restrict version | ||||
8462 | ParamTypes[0] | ||||
8463 | = S.Context.getLValueReferenceType( | ||||
8464 | S.Context.getCVRQualifiedType(*Ptr, | ||||
8465 | (Qualifiers::Volatile | | ||||
8466 | Qualifiers::Restrict))); | ||||
8467 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8468 | /*IsAssignmentOperator=*/isEqualOp); | ||||
8469 | } | ||||
8470 | } | ||||
8471 | } | ||||
8472 | |||||
8473 | if (isEqualOp) { | ||||
8474 | for (BuiltinCandidateTypeSet::iterator | ||||
8475 | Ptr = CandidateTypes[1].pointer_begin(), | ||||
8476 | PtrEnd = CandidateTypes[1].pointer_end(); | ||||
8477 | Ptr != PtrEnd; ++Ptr) { | ||||
8478 | // Make sure we don't add the same candidate twice. | ||||
8479 | if (!AddedTypes.insert(S.Context.getCanonicalType(*Ptr)).second) | ||||
8480 | continue; | ||||
8481 | |||||
8482 | QualType ParamTypes[2] = { | ||||
8483 | S.Context.getLValueReferenceType(*Ptr), | ||||
8484 | *Ptr, | ||||
8485 | }; | ||||
8486 | |||||
8487 | // non-volatile version | ||||
8488 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8489 | /*IsAssignmentOperator=*/true); | ||||
8490 | |||||
8491 | bool NeedVolatile = !(*Ptr).isVolatileQualified() && | ||||
8492 | VisibleTypeConversionsQuals.hasVolatile(); | ||||
8493 | if (NeedVolatile) { | ||||
8494 | // volatile version | ||||
8495 | ParamTypes[0] = | ||||
8496 | S.Context.getLValueReferenceType(S.Context.getVolatileType(*Ptr)); | ||||
8497 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8498 | /*IsAssignmentOperator=*/true); | ||||
8499 | } | ||||
8500 | |||||
8501 | if (!(*Ptr).isRestrictQualified() && | ||||
8502 | VisibleTypeConversionsQuals.hasRestrict()) { | ||||
8503 | // restrict version | ||||
8504 | ParamTypes[0] | ||||
8505 | = S.Context.getLValueReferenceType(S.Context.getRestrictType(*Ptr)); | ||||
8506 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8507 | /*IsAssignmentOperator=*/true); | ||||
8508 | |||||
8509 | if (NeedVolatile) { | ||||
8510 | // volatile restrict version | ||||
8511 | ParamTypes[0] | ||||
8512 | = S.Context.getLValueReferenceType( | ||||
8513 | S.Context.getCVRQualifiedType(*Ptr, | ||||
8514 | (Qualifiers::Volatile | | ||||
8515 | Qualifiers::Restrict))); | ||||
8516 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8517 | /*IsAssignmentOperator=*/true); | ||||
8518 | } | ||||
8519 | } | ||||
8520 | } | ||||
8521 | } | ||||
8522 | } | ||||
8523 | |||||
8524 | // C++ [over.built]p18: | ||||
8525 | // | ||||
8526 | // For every triple (L, VQ, R), where L is an arithmetic type, | ||||
8527 | // VQ is either volatile or empty, and R is a promoted | ||||
8528 | // arithmetic type, there exist candidate operator functions of | ||||
8529 | // the form | ||||
8530 | // | ||||
8531 | // VQ L& operator=(VQ L&, R); | ||||
8532 | // VQ L& operator*=(VQ L&, R); | ||||
8533 | // VQ L& operator/=(VQ L&, R); | ||||
8534 | // VQ L& operator+=(VQ L&, R); | ||||
8535 | // VQ L& operator-=(VQ L&, R); | ||||
8536 | void addAssignmentArithmeticOverloads(bool isEqualOp) { | ||||
8537 | if (!HasArithmeticOrEnumeralCandidateType) | ||||
8538 | return; | ||||
8539 | |||||
8540 | for (unsigned Left = 0; Left < NumArithmeticTypes; ++Left) { | ||||
8541 | for (unsigned Right = FirstPromotedArithmeticType; | ||||
8542 | Right < LastPromotedArithmeticType; ++Right) { | ||||
8543 | QualType ParamTypes[2]; | ||||
8544 | ParamTypes[1] = ArithmeticTypes[Right]; | ||||
8545 | auto LeftBaseTy = AdjustAddressSpaceForBuiltinOperandType( | ||||
8546 | S, ArithmeticTypes[Left], Args[0]); | ||||
8547 | // Add this built-in operator as a candidate (VQ is empty). | ||||
8548 | ParamTypes[0] = S.Context.getLValueReferenceType(LeftBaseTy); | ||||
8549 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8550 | /*IsAssignmentOperator=*/isEqualOp); | ||||
8551 | |||||
8552 | // Add this built-in operator as a candidate (VQ is 'volatile'). | ||||
8553 | if (VisibleTypeConversionsQuals.hasVolatile()) { | ||||
8554 | ParamTypes[0] = S.Context.getVolatileType(LeftBaseTy); | ||||
8555 | ParamTypes[0] = S.Context.getLValueReferenceType(ParamTypes[0]); | ||||
8556 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8557 | /*IsAssignmentOperator=*/isEqualOp); | ||||
8558 | } | ||||
8559 | } | ||||
8560 | } | ||||
8561 | |||||
8562 | // Extension: Add the binary operators =, +=, -=, *=, /= for vector types. | ||||
8563 | for (BuiltinCandidateTypeSet::iterator | ||||
8564 | Vec1 = CandidateTypes[0].vector_begin(), | ||||
8565 | Vec1End = CandidateTypes[0].vector_end(); | ||||
8566 | Vec1 != Vec1End; ++Vec1) { | ||||
8567 | for (BuiltinCandidateTypeSet::iterator | ||||
8568 | Vec2 = CandidateTypes[1].vector_begin(), | ||||
8569 | Vec2End = CandidateTypes[1].vector_end(); | ||||
8570 | Vec2 != Vec2End; ++Vec2) { | ||||
8571 | QualType ParamTypes[2]; | ||||
8572 | ParamTypes[1] = *Vec2; | ||||
8573 | // Add this built-in operator as a candidate (VQ is empty). | ||||
8574 | ParamTypes[0] = S.Context.getLValueReferenceType(*Vec1); | ||||
8575 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8576 | /*IsAssignmentOperator=*/isEqualOp); | ||||
8577 | |||||
8578 | // Add this built-in operator as a candidate (VQ is 'volatile'). | ||||
8579 | if (VisibleTypeConversionsQuals.hasVolatile()) { | ||||
8580 | ParamTypes[0] = S.Context.getVolatileType(*Vec1); | ||||
8581 | ParamTypes[0] = S.Context.getLValueReferenceType(ParamTypes[0]); | ||||
8582 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8583 | /*IsAssignmentOperator=*/isEqualOp); | ||||
8584 | } | ||||
8585 | } | ||||
8586 | } | ||||
8587 | } | ||||
8588 | |||||
8589 | // C++ [over.built]p22: | ||||
8590 | // | ||||
8591 | // For every triple (L, VQ, R), where L is an integral type, VQ | ||||
8592 | // is either volatile or empty, and R is a promoted integral | ||||
8593 | // type, there exist candidate operator functions of the form | ||||
8594 | // | ||||
8595 | // VQ L& operator%=(VQ L&, R); | ||||
8596 | // VQ L& operator<<=(VQ L&, R); | ||||
8597 | // VQ L& operator>>=(VQ L&, R); | ||||
8598 | // VQ L& operator&=(VQ L&, R); | ||||
8599 | // VQ L& operator^=(VQ L&, R); | ||||
8600 | // VQ L& operator|=(VQ L&, R); | ||||
8601 | void addAssignmentIntegralOverloads() { | ||||
8602 | if (!HasArithmeticOrEnumeralCandidateType) | ||||
8603 | return; | ||||
8604 | |||||
8605 | for (unsigned Left = FirstIntegralType; Left < LastIntegralType; ++Left) { | ||||
8606 | for (unsigned Right = FirstPromotedIntegralType; | ||||
8607 | Right < LastPromotedIntegralType; ++Right) { | ||||
8608 | QualType ParamTypes[2]; | ||||
8609 | ParamTypes[1] = ArithmeticTypes[Right]; | ||||
8610 | auto LeftBaseTy = AdjustAddressSpaceForBuiltinOperandType( | ||||
8611 | S, ArithmeticTypes[Left], Args[0]); | ||||
8612 | // Add this built-in operator as a candidate (VQ is empty). | ||||
8613 | ParamTypes[0] = S.Context.getLValueReferenceType(LeftBaseTy); | ||||
8614 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8615 | if (VisibleTypeConversionsQuals.hasVolatile()) { | ||||
8616 | // Add this built-in operator as a candidate (VQ is 'volatile'). | ||||
8617 | ParamTypes[0] = LeftBaseTy; | ||||
8618 | ParamTypes[0] = S.Context.getVolatileType(ParamTypes[0]); | ||||
8619 | ParamTypes[0] = S.Context.getLValueReferenceType(ParamTypes[0]); | ||||
8620 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8621 | } | ||||
8622 | } | ||||
8623 | } | ||||
8624 | } | ||||
8625 | |||||
8626 | // C++ [over.operator]p23: | ||||
8627 | // | ||||
8628 | // There also exist candidate operator functions of the form | ||||
8629 | // | ||||
8630 | // bool operator!(bool); | ||||
8631 | // bool operator&&(bool, bool); | ||||
8632 | // bool operator||(bool, bool); | ||||
8633 | void addExclaimOverload() { | ||||
8634 | QualType ParamTy = S.Context.BoolTy; | ||||
8635 | S.AddBuiltinCandidate(&ParamTy, Args, CandidateSet, | ||||
8636 | /*IsAssignmentOperator=*/false, | ||||
8637 | /*NumContextualBoolArguments=*/1); | ||||
8638 | } | ||||
8639 | void addAmpAmpOrPipePipeOverload() { | ||||
8640 | QualType ParamTypes[2] = { S.Context.BoolTy, S.Context.BoolTy }; | ||||
8641 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet, | ||||
8642 | /*IsAssignmentOperator=*/false, | ||||
8643 | /*NumContextualBoolArguments=*/2); | ||||
8644 | } | ||||
8645 | |||||
8646 | // C++ [over.built]p13: | ||||
8647 | // | ||||
8648 | // For every cv-qualified or cv-unqualified object type T there | ||||
8649 | // exist candidate operator functions of the form | ||||
8650 | // | ||||
8651 | // T* operator+(T*, ptrdiff_t); [ABOVE] | ||||
8652 | // T& operator[](T*, ptrdiff_t); | ||||
8653 | // T* operator-(T*, ptrdiff_t); [ABOVE] | ||||
8654 | // T* operator+(ptrdiff_t, T*); [ABOVE] | ||||
8655 | // T& operator[](ptrdiff_t, T*); | ||||
8656 | void addSubscriptOverloads() { | ||||
8657 | for (BuiltinCandidateTypeSet::iterator | ||||
8658 | Ptr = CandidateTypes[0].pointer_begin(), | ||||
8659 | PtrEnd = CandidateTypes[0].pointer_end(); | ||||
8660 | Ptr != PtrEnd; ++Ptr) { | ||||
8661 | QualType ParamTypes[2] = { *Ptr, S.Context.getPointerDiffType() }; | ||||
8662 | QualType PointeeType = (*Ptr)->getPointeeType(); | ||||
8663 | if (!PointeeType->isObjectType()) | ||||
8664 | continue; | ||||
8665 | |||||
8666 | // T& operator[](T*, ptrdiff_t) | ||||
8667 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8668 | } | ||||
8669 | |||||
8670 | for (BuiltinCandidateTypeSet::iterator | ||||
8671 | Ptr = CandidateTypes[1].pointer_begin(), | ||||
8672 | PtrEnd = CandidateTypes[1].pointer_end(); | ||||
8673 | Ptr != PtrEnd; ++Ptr) { | ||||
8674 | QualType ParamTypes[2] = { S.Context.getPointerDiffType(), *Ptr }; | ||||
8675 | QualType PointeeType = (*Ptr)->getPointeeType(); | ||||
8676 | if (!PointeeType->isObjectType()) | ||||
8677 | continue; | ||||
8678 | |||||
8679 | // T& operator[](ptrdiff_t, T*) | ||||
8680 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8681 | } | ||||
8682 | } | ||||
8683 | |||||
8684 | // C++ [over.built]p11: | ||||
8685 | // For every quintuple (C1, C2, T, CV1, CV2), where C2 is a class type, | ||||
8686 | // C1 is the same type as C2 or is a derived class of C2, T is an object | ||||
8687 | // type or a function type, and CV1 and CV2 are cv-qualifier-seqs, | ||||
8688 | // there exist candidate operator functions of the form | ||||
8689 | // | ||||
8690 | // CV12 T& operator->*(CV1 C1*, CV2 T C2::*); | ||||
8691 | // | ||||
8692 | // where CV12 is the union of CV1 and CV2. | ||||
8693 | void addArrowStarOverloads() { | ||||
8694 | for (BuiltinCandidateTypeSet::iterator | ||||
8695 | Ptr = CandidateTypes[0].pointer_begin(), | ||||
8696 | PtrEnd = CandidateTypes[0].pointer_end(); | ||||
8697 | Ptr != PtrEnd; ++Ptr) { | ||||
8698 | QualType C1Ty = (*Ptr); | ||||
8699 | QualType C1; | ||||
8700 | QualifierCollector Q1; | ||||
8701 | C1 = QualType(Q1.strip(C1Ty->getPointeeType()), 0); | ||||
8702 | if (!isa<RecordType>(C1)) | ||||
8703 | continue; | ||||
8704 | // heuristic to reduce number of builtin candidates in the set. | ||||
8705 | // Add volatile/restrict version only if there are conversions to a | ||||
8706 | // volatile/restrict type. | ||||
8707 | if (!VisibleTypeConversionsQuals.hasVolatile() && Q1.hasVolatile()) | ||||
8708 | continue; | ||||
8709 | if (!VisibleTypeConversionsQuals.hasRestrict() && Q1.hasRestrict()) | ||||
8710 | continue; | ||||
8711 | for (BuiltinCandidateTypeSet::iterator | ||||
8712 | MemPtr = CandidateTypes[1].member_pointer_begin(), | ||||
8713 | MemPtrEnd = CandidateTypes[1].member_pointer_end(); | ||||
8714 | MemPtr != MemPtrEnd; ++MemPtr) { | ||||
8715 | const MemberPointerType *mptr = cast<MemberPointerType>(*MemPtr); | ||||
8716 | QualType C2 = QualType(mptr->getClass(), 0); | ||||
8717 | C2 = C2.getUnqualifiedType(); | ||||
8718 | if (C1 != C2 && !S.IsDerivedFrom(CandidateSet.getLocation(), C1, C2)) | ||||
8719 | break; | ||||
8720 | QualType ParamTypes[2] = { *Ptr, *MemPtr }; | ||||
8721 | // build CV12 T& | ||||
8722 | QualType T = mptr->getPointeeType(); | ||||
8723 | if (!VisibleTypeConversionsQuals.hasVolatile() && | ||||
8724 | T.isVolatileQualified()) | ||||
8725 | continue; | ||||
8726 | if (!VisibleTypeConversionsQuals.hasRestrict() && | ||||
8727 | T.isRestrictQualified()) | ||||
8728 | continue; | ||||
8729 | T = Q1.apply(S.Context, T); | ||||
8730 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8731 | } | ||||
8732 | } | ||||
8733 | } | ||||
8734 | |||||
8735 | // Note that we don't consider the first argument, since it has been | ||||
8736 | // contextually converted to bool long ago. The candidates below are | ||||
8737 | // therefore added as binary. | ||||
8738 | // | ||||
8739 | // C++ [over.built]p25: | ||||
8740 | // For every type T, where T is a pointer, pointer-to-member, or scoped | ||||
8741 | // enumeration type, there exist candidate operator functions of the form | ||||
8742 | // | ||||
8743 | // T operator?(bool, T, T); | ||||
8744 | // | ||||
8745 | void addConditionalOperatorOverloads() { | ||||
8746 | /// Set of (canonical) types that we've already handled. | ||||
8747 | llvm::SmallPtrSet<QualType, 8> AddedTypes; | ||||
8748 | |||||
8749 | for (unsigned ArgIdx = 0; ArgIdx < 2; ++ArgIdx) { | ||||
8750 | for (BuiltinCandidateTypeSet::iterator | ||||
8751 | Ptr = CandidateTypes[ArgIdx].pointer_begin(), | ||||
8752 | PtrEnd = CandidateTypes[ArgIdx].pointer_end(); | ||||
8753 | Ptr != PtrEnd; ++Ptr) { | ||||
8754 | if (!AddedTypes.insert(S.Context.getCanonicalType(*Ptr)).second) | ||||
8755 | continue; | ||||
8756 | |||||
8757 | QualType ParamTypes[2] = { *Ptr, *Ptr }; | ||||
8758 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8759 | } | ||||
8760 | |||||
8761 | for (BuiltinCandidateTypeSet::iterator | ||||
8762 | MemPtr = CandidateTypes[ArgIdx].member_pointer_begin(), | ||||
8763 | MemPtrEnd = CandidateTypes[ArgIdx].member_pointer_end(); | ||||
8764 | MemPtr != MemPtrEnd; ++MemPtr) { | ||||
8765 | if (!AddedTypes.insert(S.Context.getCanonicalType(*MemPtr)).second) | ||||
8766 | continue; | ||||
8767 | |||||
8768 | QualType ParamTypes[2] = { *MemPtr, *MemPtr }; | ||||
8769 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8770 | } | ||||
8771 | |||||
8772 | if (S.getLangOpts().CPlusPlus11) { | ||||
8773 | for (BuiltinCandidateTypeSet::iterator | ||||
8774 | Enum = CandidateTypes[ArgIdx].enumeration_begin(), | ||||
8775 | EnumEnd = CandidateTypes[ArgIdx].enumeration_end(); | ||||
8776 | Enum != EnumEnd; ++Enum) { | ||||
8777 | if (!(*Enum)->castAs<EnumType>()->getDecl()->isScoped()) | ||||
8778 | continue; | ||||
8779 | |||||
8780 | if (!AddedTypes.insert(S.Context.getCanonicalType(*Enum)).second) | ||||
8781 | continue; | ||||
8782 | |||||
8783 | QualType ParamTypes[2] = { *Enum, *Enum }; | ||||
8784 | S.AddBuiltinCandidate(ParamTypes, Args, CandidateSet); | ||||
8785 | } | ||||
8786 | } | ||||
8787 | } | ||||
8788 | } | ||||
8789 | }; | ||||
8790 | |||||
8791 | } // end anonymous namespace | ||||
8792 | |||||
8793 | /// AddBuiltinOperatorCandidates - Add the appropriate built-in | ||||
8794 | /// operator overloads to the candidate set (C++ [over.built]), based | ||||
8795 | /// on the operator @p Op and the arguments given. For example, if the | ||||
8796 | /// operator is a binary '+', this routine might add "int | ||||
8797 | /// operator+(int, int)" to cover integer addition. | ||||
8798 | void Sema::AddBuiltinOperatorCandidates(OverloadedOperatorKind Op, | ||||
8799 | SourceLocation OpLoc, | ||||
8800 | ArrayRef<Expr *> Args, | ||||
8801 | OverloadCandidateSet &CandidateSet) { | ||||
8802 | // Find all of the types that the arguments can convert to, but only | ||||
8803 | // if the operator we're looking at has built-in operator candidates | ||||
8804 | // that make use of these types. Also record whether we encounter non-record | ||||
8805 | // candidate types or either arithmetic or enumeral candidate types. | ||||
8806 | Qualifiers VisibleTypeConversionsQuals; | ||||
8807 | VisibleTypeConversionsQuals.addConst(); | ||||
8808 | for (unsigned ArgIdx = 0, N = Args.size(); ArgIdx != N; ++ArgIdx) | ||||
8809 | VisibleTypeConversionsQuals += CollectVRQualifiers(Context, Args[ArgIdx]); | ||||
8810 | |||||
8811 | bool HasNonRecordCandidateType = false; | ||||
8812 | bool HasArithmeticOrEnumeralCandidateType = false; | ||||
8813 | SmallVector<BuiltinCandidateTypeSet, 2> CandidateTypes; | ||||
8814 | for (unsigned ArgIdx = 0, N = Args.size(); ArgIdx != N; ++ArgIdx) { | ||||
8815 | CandidateTypes.emplace_back(*this); | ||||
8816 | CandidateTypes[ArgIdx].AddTypesConvertedFrom(Args[ArgIdx]->getType(), | ||||
8817 | OpLoc, | ||||
8818 | true, | ||||
8819 | (Op == OO_Exclaim || | ||||
8820 | Op == OO_AmpAmp || | ||||
8821 | Op == OO_PipePipe), | ||||
8822 | VisibleTypeConversionsQuals); | ||||
8823 | HasNonRecordCandidateType = HasNonRecordCandidateType || | ||||
8824 | CandidateTypes[ArgIdx].hasNonRecordTypes(); | ||||
8825 | HasArithmeticOrEnumeralCandidateType = | ||||
8826 | HasArithmeticOrEnumeralCandidateType || | ||||
8827 | CandidateTypes[ArgIdx].hasArithmeticOrEnumeralTypes(); | ||||
8828 | } | ||||
8829 | |||||
8830 | // Exit early when no non-record types have been added to the candidate set | ||||
8831 | // for any of the arguments to the operator. | ||||
8832 | // | ||||
8833 | // We can't exit early for !, ||, or &&, since there we have always have | ||||
8834 | // 'bool' overloads. | ||||
8835 | if (!HasNonRecordCandidateType && | ||||
8836 | !(Op == OO_Exclaim || Op == OO_AmpAmp || Op == OO_PipePipe)) | ||||
8837 | return; | ||||
8838 | |||||
8839 | // Setup an object to manage the common state for building overloads. | ||||
8840 | BuiltinOperatorOverloadBuilder OpBuilder(*this, Args, | ||||
8841 | VisibleTypeConversionsQuals, | ||||
8842 | HasArithmeticOrEnumeralCandidateType, | ||||
8843 | CandidateTypes, CandidateSet); | ||||
8844 | |||||
8845 | // Dispatch over the operation to add in only those overloads which apply. | ||||
8846 | switch (Op) { | ||||
8847 | case OO_None: | ||||
8848 | case NUM_OVERLOADED_OPERATORS: | ||||
8849 | llvm_unreachable("Expected an overloaded operator")::llvm::llvm_unreachable_internal("Expected an overloaded operator" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 8849); | ||||
8850 | |||||
8851 | case OO_New: | ||||
8852 | case OO_Delete: | ||||
8853 | case OO_Array_New: | ||||
8854 | case OO_Array_Delete: | ||||
8855 | case OO_Call: | ||||
8856 | llvm_unreachable(::llvm::llvm_unreachable_internal("Special operators don't use AddBuiltinOperatorCandidates" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 8857) | ||||
8857 | "Special operators don't use AddBuiltinOperatorCandidates")::llvm::llvm_unreachable_internal("Special operators don't use AddBuiltinOperatorCandidates" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 8857); | ||||
8858 | |||||
8859 | case OO_Comma: | ||||
8860 | case OO_Arrow: | ||||
8861 | case OO_Coawait: | ||||
8862 | // C++ [over.match.oper]p3: | ||||
8863 | // -- For the operator ',', the unary operator '&', the | ||||
8864 | // operator '->', or the operator 'co_await', the | ||||
8865 | // built-in candidates set is empty. | ||||
8866 | break; | ||||
8867 | |||||
8868 | case OO_Plus: // '+' is either unary or binary | ||||
8869 | if (Args.size() == 1) | ||||
8870 | OpBuilder.addUnaryPlusPointerOverloads(); | ||||
8871 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||
8872 | |||||
8873 | case OO_Minus: // '-' is either unary or binary | ||||
8874 | if (Args.size() == 1) { | ||||
8875 | OpBuilder.addUnaryPlusOrMinusArithmeticOverloads(); | ||||
8876 | } else { | ||||
8877 | OpBuilder.addBinaryPlusOrMinusPointerOverloads(Op); | ||||
8878 | OpBuilder.addGenericBinaryArithmeticOverloads(); | ||||
8879 | } | ||||
8880 | break; | ||||
8881 | |||||
8882 | case OO_Star: // '*' is either unary or binary | ||||
8883 | if (Args.size() == 1) | ||||
8884 | OpBuilder.addUnaryStarPointerOverloads(); | ||||
8885 | else | ||||
8886 | OpBuilder.addGenericBinaryArithmeticOverloads(); | ||||
8887 | break; | ||||
8888 | |||||
8889 | case OO_Slash: | ||||
8890 | OpBuilder.addGenericBinaryArithmeticOverloads(); | ||||
8891 | break; | ||||
8892 | |||||
8893 | case OO_PlusPlus: | ||||
8894 | case OO_MinusMinus: | ||||
8895 | OpBuilder.addPlusPlusMinusMinusArithmeticOverloads(Op); | ||||
8896 | OpBuilder.addPlusPlusMinusMinusPointerOverloads(); | ||||
8897 | break; | ||||
8898 | |||||
8899 | case OO_EqualEqual: | ||||
8900 | case OO_ExclaimEqual: | ||||
8901 | OpBuilder.addEqualEqualOrNotEqualMemberPointerOrNullptrOverloads(); | ||||
8902 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||
8903 | |||||
8904 | case OO_Less: | ||||
8905 | case OO_Greater: | ||||
8906 | case OO_LessEqual: | ||||
8907 | case OO_GreaterEqual: | ||||
8908 | OpBuilder.addGenericBinaryPointerOrEnumeralOverloads(); | ||||
8909 | OpBuilder.addGenericBinaryArithmeticOverloads(); | ||||
8910 | break; | ||||
8911 | |||||
8912 | case OO_Spaceship: | ||||
8913 | OpBuilder.addGenericBinaryPointerOrEnumeralOverloads(); | ||||
8914 | OpBuilder.addThreeWayArithmeticOverloads(); | ||||
8915 | break; | ||||
8916 | |||||
8917 | case OO_Percent: | ||||
8918 | case OO_Caret: | ||||
8919 | case OO_Pipe: | ||||
8920 | case OO_LessLess: | ||||
8921 | case OO_GreaterGreater: | ||||
8922 | OpBuilder.addBinaryBitwiseArithmeticOverloads(Op); | ||||
8923 | break; | ||||
8924 | |||||
8925 | case OO_Amp: // '&' is either unary or binary | ||||
8926 | if (Args.size() == 1) | ||||
8927 | // C++ [over.match.oper]p3: | ||||
8928 | // -- For the operator ',', the unary operator '&', or the | ||||
8929 | // operator '->', the built-in candidates set is empty. | ||||
8930 | break; | ||||
8931 | |||||
8932 | OpBuilder.addBinaryBitwiseArithmeticOverloads(Op); | ||||
8933 | break; | ||||
8934 | |||||
8935 | case OO_Tilde: | ||||
8936 | OpBuilder.addUnaryTildePromotedIntegralOverloads(); | ||||
8937 | break; | ||||
8938 | |||||
8939 | case OO_Equal: | ||||
8940 | OpBuilder.addAssignmentMemberPointerOrEnumeralOverloads(); | ||||
8941 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||
8942 | |||||
8943 | case OO_PlusEqual: | ||||
8944 | case OO_MinusEqual: | ||||
8945 | OpBuilder.addAssignmentPointerOverloads(Op == OO_Equal); | ||||
8946 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | ||||
8947 | |||||
8948 | case OO_StarEqual: | ||||
8949 | case OO_SlashEqual: | ||||
8950 | OpBuilder.addAssignmentArithmeticOverloads(Op == OO_Equal); | ||||
8951 | break; | ||||
8952 | |||||
8953 | case OO_PercentEqual: | ||||
8954 | case OO_LessLessEqual: | ||||
8955 | case OO_GreaterGreaterEqual: | ||||
8956 | case OO_AmpEqual: | ||||
8957 | case OO_CaretEqual: | ||||
8958 | case OO_PipeEqual: | ||||
8959 | OpBuilder.addAssignmentIntegralOverloads(); | ||||
8960 | break; | ||||
8961 | |||||
8962 | case OO_Exclaim: | ||||
8963 | OpBuilder.addExclaimOverload(); | ||||
8964 | break; | ||||
8965 | |||||
8966 | case OO_AmpAmp: | ||||
8967 | case OO_PipePipe: | ||||
8968 | OpBuilder.addAmpAmpOrPipePipeOverload(); | ||||
8969 | break; | ||||
8970 | |||||
8971 | case OO_Subscript: | ||||
8972 | OpBuilder.addSubscriptOverloads(); | ||||
8973 | break; | ||||
8974 | |||||
8975 | case OO_ArrowStar: | ||||
8976 | OpBuilder.addArrowStarOverloads(); | ||||
8977 | break; | ||||
8978 | |||||
8979 | case OO_Conditional: | ||||
8980 | OpBuilder.addConditionalOperatorOverloads(); | ||||
8981 | OpBuilder.addGenericBinaryArithmeticOverloads(); | ||||
8982 | break; | ||||
8983 | } | ||||
8984 | } | ||||
8985 | |||||
8986 | /// Add function candidates found via argument-dependent lookup | ||||
8987 | /// to the set of overloading candidates. | ||||
8988 | /// | ||||
8989 | /// This routine performs argument-dependent name lookup based on the | ||||
8990 | /// given function name (which may also be an operator name) and adds | ||||
8991 | /// all of the overload candidates found by ADL to the overload | ||||
8992 | /// candidate set (C++ [basic.lookup.argdep]). | ||||
8993 | void | ||||
8994 | Sema::AddArgumentDependentLookupCandidates(DeclarationName Name, | ||||
8995 | SourceLocation Loc, | ||||
8996 | ArrayRef<Expr *> Args, | ||||
8997 | TemplateArgumentListInfo *ExplicitTemplateArgs, | ||||
8998 | OverloadCandidateSet& CandidateSet, | ||||
8999 | bool PartialOverloading) { | ||||
9000 | ADLResult Fns; | ||||
9001 | |||||
9002 | // FIXME: This approach for uniquing ADL results (and removing | ||||
9003 | // redundant candidates from the set) relies on pointer-equality, | ||||
9004 | // which means we need to key off the canonical decl. However, | ||||
9005 | // always going back to the canonical decl might not get us the | ||||
9006 | // right set of default arguments. What default arguments are | ||||
9007 | // we supposed to consider on ADL candidates, anyway? | ||||
9008 | |||||
9009 | // FIXME: Pass in the explicit template arguments? | ||||
9010 | ArgumentDependentLookup(Name, Loc, Args, Fns); | ||||
9011 | |||||
9012 | // Erase all of the candidates we already knew about. | ||||
9013 | for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(), | ||||
9014 | CandEnd = CandidateSet.end(); | ||||
9015 | Cand != CandEnd; ++Cand) | ||||
9016 | if (Cand->Function) { | ||||
9017 | Fns.erase(Cand->Function); | ||||
9018 | if (FunctionTemplateDecl *FunTmpl = Cand->Function->getPrimaryTemplate()) | ||||
9019 | Fns.erase(FunTmpl); | ||||
9020 | } | ||||
9021 | |||||
9022 | // For each of the ADL candidates we found, add it to the overload | ||||
9023 | // set. | ||||
9024 | for (ADLResult::iterator I = Fns.begin(), E = Fns.end(); I != E; ++I) { | ||||
9025 | DeclAccessPair FoundDecl = DeclAccessPair::make(*I, AS_none); | ||||
9026 | |||||
9027 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) { | ||||
9028 | if (ExplicitTemplateArgs) | ||||
9029 | continue; | ||||
9030 | |||||
9031 | AddOverloadCandidate(FD, FoundDecl, Args, CandidateSet, | ||||
9032 | /*SuppressUserConversions=*/false, PartialOverloading, | ||||
9033 | /*AllowExplicit*/ true, | ||||
9034 | /*AllowExplicitConversions*/ false, | ||||
9035 | ADLCallKind::UsesADL); | ||||
9036 | } else { | ||||
9037 | AddTemplateOverloadCandidate( | ||||
9038 | cast<FunctionTemplateDecl>(*I), FoundDecl, ExplicitTemplateArgs, Args, | ||||
9039 | CandidateSet, | ||||
9040 | /*SuppressUserConversions=*/false, PartialOverloading, | ||||
9041 | /*AllowExplicit*/true, ADLCallKind::UsesADL); | ||||
9042 | } | ||||
9043 | } | ||||
9044 | } | ||||
9045 | |||||
9046 | namespace { | ||||
9047 | enum class Comparison { Equal, Better, Worse }; | ||||
9048 | } | ||||
9049 | |||||
9050 | /// Compares the enable_if attributes of two FunctionDecls, for the purposes of | ||||
9051 | /// overload resolution. | ||||
9052 | /// | ||||
9053 | /// Cand1's set of enable_if attributes are said to be "better" than Cand2's iff | ||||
9054 | /// Cand1's first N enable_if attributes have precisely the same conditions as | ||||
9055 | /// Cand2's first N enable_if attributes (where N = the number of enable_if | ||||
9056 | /// attributes on Cand2), and Cand1 has more than N enable_if attributes. | ||||
9057 | /// | ||||
9058 | /// Note that you can have a pair of candidates such that Cand1's enable_if | ||||
9059 | /// attributes are worse than Cand2's, and Cand2's enable_if attributes are | ||||
9060 | /// worse than Cand1's. | ||||
9061 | static Comparison compareEnableIfAttrs(const Sema &S, const FunctionDecl *Cand1, | ||||
9062 | const FunctionDecl *Cand2) { | ||||
9063 | // Common case: One (or both) decls don't have enable_if attrs. | ||||
9064 | bool Cand1Attr = Cand1->hasAttr<EnableIfAttr>(); | ||||
9065 | bool Cand2Attr = Cand2->hasAttr<EnableIfAttr>(); | ||||
9066 | if (!Cand1Attr || !Cand2Attr) { | ||||
9067 | if (Cand1Attr == Cand2Attr) | ||||
9068 | return Comparison::Equal; | ||||
9069 | return Cand1Attr ? Comparison::Better : Comparison::Worse; | ||||
9070 | } | ||||
9071 | |||||
9072 | auto Cand1Attrs = Cand1->specific_attrs<EnableIfAttr>(); | ||||
9073 | auto Cand2Attrs = Cand2->specific_attrs<EnableIfAttr>(); | ||||
9074 | |||||
9075 | llvm::FoldingSetNodeID Cand1ID, Cand2ID; | ||||
9076 | for (auto Pair : zip_longest(Cand1Attrs, Cand2Attrs)) { | ||||
9077 | Optional<EnableIfAttr *> Cand1A = std::get<0>(Pair); | ||||
9078 | Optional<EnableIfAttr *> Cand2A = std::get<1>(Pair); | ||||
9079 | |||||
9080 | // It's impossible for Cand1 to be better than (or equal to) Cand2 if Cand1 | ||||
9081 | // has fewer enable_if attributes than Cand2, and vice versa. | ||||
9082 | if (!Cand1A) | ||||
9083 | return Comparison::Worse; | ||||
9084 | if (!Cand2A) | ||||
9085 | return Comparison::Better; | ||||
9086 | |||||
9087 | Cand1ID.clear(); | ||||
9088 | Cand2ID.clear(); | ||||
9089 | |||||
9090 | (*Cand1A)->getCond()->Profile(Cand1ID, S.getASTContext(), true); | ||||
9091 | (*Cand2A)->getCond()->Profile(Cand2ID, S.getASTContext(), true); | ||||
9092 | if (Cand1ID != Cand2ID) | ||||
9093 | return Comparison::Worse; | ||||
9094 | } | ||||
9095 | |||||
9096 | return Comparison::Equal; | ||||
9097 | } | ||||
9098 | |||||
9099 | static bool isBetterMultiversionCandidate(const OverloadCandidate &Cand1, | ||||
9100 | const OverloadCandidate &Cand2) { | ||||
9101 | if (!Cand1.Function || !Cand1.Function->isMultiVersion() || !Cand2.Function || | ||||
9102 | !Cand2.Function->isMultiVersion()) | ||||
9103 | return false; | ||||
9104 | |||||
9105 | // If Cand1 is invalid, it cannot be a better match, if Cand2 is invalid, this | ||||
9106 | // is obviously better. | ||||
9107 | if (Cand1.Function->isInvalidDecl()) return false; | ||||
9108 | if (Cand2.Function->isInvalidDecl()) return true; | ||||
9109 | |||||
9110 | // If this is a cpu_dispatch/cpu_specific multiversion situation, prefer | ||||
9111 | // cpu_dispatch, else arbitrarily based on the identifiers. | ||||
9112 | bool Cand1CPUDisp = Cand1.Function->hasAttr<CPUDispatchAttr>(); | ||||
9113 | bool Cand2CPUDisp = Cand2.Function->hasAttr<CPUDispatchAttr>(); | ||||
9114 | const auto *Cand1CPUSpec = Cand1.Function->getAttr<CPUSpecificAttr>(); | ||||
9115 | const auto *Cand2CPUSpec = Cand2.Function->getAttr<CPUSpecificAttr>(); | ||||
9116 | |||||
9117 | if (!Cand1CPUDisp && !Cand2CPUDisp && !Cand1CPUSpec && !Cand2CPUSpec) | ||||
9118 | return false; | ||||
9119 | |||||
9120 | if (Cand1CPUDisp && !Cand2CPUDisp) | ||||
9121 | return true; | ||||
9122 | if (Cand2CPUDisp && !Cand1CPUDisp) | ||||
9123 | return false; | ||||
9124 | |||||
9125 | if (Cand1CPUSpec && Cand2CPUSpec) { | ||||
9126 | if (Cand1CPUSpec->cpus_size() != Cand2CPUSpec->cpus_size()) | ||||
9127 | return Cand1CPUSpec->cpus_size() < Cand2CPUSpec->cpus_size(); | ||||
9128 | |||||
9129 | std::pair<CPUSpecificAttr::cpus_iterator, CPUSpecificAttr::cpus_iterator> | ||||
9130 | FirstDiff = std::mismatch( | ||||
9131 | Cand1CPUSpec->cpus_begin(), Cand1CPUSpec->cpus_end(), | ||||
9132 | Cand2CPUSpec->cpus_begin(), | ||||
9133 | [](const IdentifierInfo *LHS, const IdentifierInfo *RHS) { | ||||
9134 | return LHS->getName() == RHS->getName(); | ||||
9135 | }); | ||||
9136 | |||||
9137 | assert(FirstDiff.first != Cand1CPUSpec->cpus_end() &&((FirstDiff.first != Cand1CPUSpec->cpus_end() && "Two different cpu-specific versions should not have the same " "identifier list, otherwise they'd be the same decl!") ? static_cast <void> (0) : __assert_fail ("FirstDiff.first != Cand1CPUSpec->cpus_end() && \"Two different cpu-specific versions should not have the same \" \"identifier list, otherwise they'd be the same decl!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9139, __PRETTY_FUNCTION__)) | ||||
9138 | "Two different cpu-specific versions should not have the same "((FirstDiff.first != Cand1CPUSpec->cpus_end() && "Two different cpu-specific versions should not have the same " "identifier list, otherwise they'd be the same decl!") ? static_cast <void> (0) : __assert_fail ("FirstDiff.first != Cand1CPUSpec->cpus_end() && \"Two different cpu-specific versions should not have the same \" \"identifier list, otherwise they'd be the same decl!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9139, __PRETTY_FUNCTION__)) | ||||
9139 | "identifier list, otherwise they'd be the same decl!")((FirstDiff.first != Cand1CPUSpec->cpus_end() && "Two different cpu-specific versions should not have the same " "identifier list, otherwise they'd be the same decl!") ? static_cast <void> (0) : __assert_fail ("FirstDiff.first != Cand1CPUSpec->cpus_end() && \"Two different cpu-specific versions should not have the same \" \"identifier list, otherwise they'd be the same decl!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9139, __PRETTY_FUNCTION__)); | ||||
9140 | return (*FirstDiff.first)->getName() < (*FirstDiff.second)->getName(); | ||||
9141 | } | ||||
9142 | llvm_unreachable("No way to get here unless both had cpu_dispatch")::llvm::llvm_unreachable_internal("No way to get here unless both had cpu_dispatch" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9142); | ||||
9143 | } | ||||
9144 | |||||
9145 | /// isBetterOverloadCandidate - Determines whether the first overload | ||||
9146 | /// candidate is a better candidate than the second (C++ 13.3.3p1). | ||||
9147 | bool clang::isBetterOverloadCandidate( | ||||
9148 | Sema &S, const OverloadCandidate &Cand1, const OverloadCandidate &Cand2, | ||||
9149 | SourceLocation Loc, OverloadCandidateSet::CandidateSetKind Kind) { | ||||
9150 | // Define viable functions to be better candidates than non-viable | ||||
9151 | // functions. | ||||
9152 | if (!Cand2.Viable) | ||||
9153 | return Cand1.Viable; | ||||
9154 | else if (!Cand1.Viable) | ||||
9155 | return false; | ||||
9156 | |||||
9157 | // C++ [over.match.best]p1: | ||||
9158 | // | ||||
9159 | // -- if F is a static member function, ICS1(F) is defined such | ||||
9160 | // that ICS1(F) is neither better nor worse than ICS1(G) for | ||||
9161 | // any function G, and, symmetrically, ICS1(G) is neither | ||||
9162 | // better nor worse than ICS1(F). | ||||
9163 | unsigned StartArg = 0; | ||||
9164 | if (Cand1.IgnoreObjectArgument || Cand2.IgnoreObjectArgument) | ||||
9165 | StartArg = 1; | ||||
9166 | |||||
9167 | auto IsIllFormedConversion = [&](const ImplicitConversionSequence &ICS) { | ||||
9168 | // We don't allow incompatible pointer conversions in C++. | ||||
9169 | if (!S.getLangOpts().CPlusPlus) | ||||
9170 | return ICS.isStandard() && | ||||
9171 | ICS.Standard.Second == ICK_Incompatible_Pointer_Conversion; | ||||
9172 | |||||
9173 | // The only ill-formed conversion we allow in C++ is the string literal to | ||||
9174 | // char* conversion, which is only considered ill-formed after C++11. | ||||
9175 | return S.getLangOpts().CPlusPlus11 && !S.getLangOpts().WritableStrings && | ||||
9176 | hasDeprecatedStringLiteralToCharPtrConversion(ICS); | ||||
9177 | }; | ||||
9178 | |||||
9179 | // Define functions that don't require ill-formed conversions for a given | ||||
9180 | // argument to be better candidates than functions that do. | ||||
9181 | unsigned NumArgs = Cand1.Conversions.size(); | ||||
9182 | assert(Cand2.Conversions.size() == NumArgs && "Overload candidate mismatch")((Cand2.Conversions.size() == NumArgs && "Overload candidate mismatch" ) ? static_cast<void> (0) : __assert_fail ("Cand2.Conversions.size() == NumArgs && \"Overload candidate mismatch\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9182, __PRETTY_FUNCTION__)); | ||||
9183 | bool HasBetterConversion = false; | ||||
9184 | for (unsigned ArgIdx = StartArg; ArgIdx < NumArgs; ++ArgIdx) { | ||||
9185 | bool Cand1Bad = IsIllFormedConversion(Cand1.Conversions[ArgIdx]); | ||||
9186 | bool Cand2Bad = IsIllFormedConversion(Cand2.Conversions[ArgIdx]); | ||||
9187 | if (Cand1Bad != Cand2Bad) { | ||||
9188 | if (Cand1Bad) | ||||
9189 | return false; | ||||
9190 | HasBetterConversion = true; | ||||
9191 | } | ||||
9192 | } | ||||
9193 | |||||
9194 | if (HasBetterConversion) | ||||
9195 | return true; | ||||
9196 | |||||
9197 | // C++ [over.match.best]p1: | ||||
9198 | // A viable function F1 is defined to be a better function than another | ||||
9199 | // viable function F2 if for all arguments i, ICSi(F1) is not a worse | ||||
9200 | // conversion sequence than ICSi(F2), and then... | ||||
9201 | for (unsigned ArgIdx = StartArg; ArgIdx < NumArgs; ++ArgIdx) { | ||||
9202 | switch (CompareImplicitConversionSequences(S, Loc, | ||||
9203 | Cand1.Conversions[ArgIdx], | ||||
9204 | Cand2.Conversions[ArgIdx])) { | ||||
9205 | case ImplicitConversionSequence::Better: | ||||
9206 | // Cand1 has a better conversion sequence. | ||||
9207 | HasBetterConversion = true; | ||||
9208 | break; | ||||
9209 | |||||
9210 | case ImplicitConversionSequence::Worse: | ||||
9211 | // Cand1 can't be better than Cand2. | ||||
9212 | return false; | ||||
9213 | |||||
9214 | case ImplicitConversionSequence::Indistinguishable: | ||||
9215 | // Do nothing. | ||||
9216 | break; | ||||
9217 | } | ||||
9218 | } | ||||
9219 | |||||
9220 | // -- for some argument j, ICSj(F1) is a better conversion sequence than | ||||
9221 | // ICSj(F2), or, if not that, | ||||
9222 | if (HasBetterConversion) | ||||
9223 | return true; | ||||
9224 | |||||
9225 | // -- the context is an initialization by user-defined conversion | ||||
9226 | // (see 8.5, 13.3.1.5) and the standard conversion sequence | ||||
9227 | // from the return type of F1 to the destination type (i.e., | ||||
9228 | // the type of the entity being initialized) is a better | ||||
9229 | // conversion sequence than the standard conversion sequence | ||||
9230 | // from the return type of F2 to the destination type. | ||||
9231 | if (Kind == OverloadCandidateSet::CSK_InitByUserDefinedConversion && | ||||
9232 | Cand1.Function && Cand2.Function && | ||||
9233 | isa<CXXConversionDecl>(Cand1.Function) && | ||||
9234 | isa<CXXConversionDecl>(Cand2.Function)) { | ||||
9235 | // First check whether we prefer one of the conversion functions over the | ||||
9236 | // other. This only distinguishes the results in non-standard, extension | ||||
9237 | // cases such as the conversion from a lambda closure type to a function | ||||
9238 | // pointer or block. | ||||
9239 | ImplicitConversionSequence::CompareKind Result = | ||||
9240 | compareConversionFunctions(S, Cand1.Function, Cand2.Function); | ||||
9241 | if (Result == ImplicitConversionSequence::Indistinguishable) | ||||
9242 | Result = CompareStandardConversionSequences(S, Loc, | ||||
9243 | Cand1.FinalConversion, | ||||
9244 | Cand2.FinalConversion); | ||||
9245 | |||||
9246 | if (Result != ImplicitConversionSequence::Indistinguishable) | ||||
9247 | return Result == ImplicitConversionSequence::Better; | ||||
9248 | |||||
9249 | // FIXME: Compare kind of reference binding if conversion functions | ||||
9250 | // convert to a reference type used in direct reference binding, per | ||||
9251 | // C++14 [over.match.best]p1 section 2 bullet 3. | ||||
9252 | } | ||||
9253 | |||||
9254 | // FIXME: Work around a defect in the C++17 guaranteed copy elision wording, | ||||
9255 | // as combined with the resolution to CWG issue 243. | ||||
9256 | // | ||||
9257 | // When the context is initialization by constructor ([over.match.ctor] or | ||||
9258 | // either phase of [over.match.list]), a constructor is preferred over | ||||
9259 | // a conversion function. | ||||
9260 | if (Kind == OverloadCandidateSet::CSK_InitByConstructor && NumArgs == 1 && | ||||
9261 | Cand1.Function && Cand2.Function && | ||||
9262 | isa<CXXConstructorDecl>(Cand1.Function) != | ||||
9263 | isa<CXXConstructorDecl>(Cand2.Function)) | ||||
9264 | return isa<CXXConstructorDecl>(Cand1.Function); | ||||
9265 | |||||
9266 | // -- F1 is a non-template function and F2 is a function template | ||||
9267 | // specialization, or, if not that, | ||||
9268 | bool Cand1IsSpecialization = Cand1.Function && | ||||
9269 | Cand1.Function->getPrimaryTemplate(); | ||||
9270 | bool Cand2IsSpecialization = Cand2.Function && | ||||
9271 | Cand2.Function->getPrimaryTemplate(); | ||||
9272 | if (Cand1IsSpecialization != Cand2IsSpecialization) | ||||
9273 | return Cand2IsSpecialization; | ||||
9274 | |||||
9275 | // -- F1 and F2 are function template specializations, and the function | ||||
9276 | // template for F1 is more specialized than the template for F2 | ||||
9277 | // according to the partial ordering rules described in 14.5.5.2, or, | ||||
9278 | // if not that, | ||||
9279 | if (Cand1IsSpecialization && Cand2IsSpecialization) { | ||||
9280 | if (FunctionTemplateDecl *BetterTemplate | ||||
9281 | = S.getMoreSpecializedTemplate(Cand1.Function->getPrimaryTemplate(), | ||||
9282 | Cand2.Function->getPrimaryTemplate(), | ||||
9283 | Loc, | ||||
9284 | isa<CXXConversionDecl>(Cand1.Function)? TPOC_Conversion | ||||
9285 | : TPOC_Call, | ||||
9286 | Cand1.ExplicitCallArguments, | ||||
9287 | Cand2.ExplicitCallArguments)) | ||||
9288 | return BetterTemplate == Cand1.Function->getPrimaryTemplate(); | ||||
9289 | } | ||||
9290 | |||||
9291 | // FIXME: Work around a defect in the C++17 inheriting constructor wording. | ||||
9292 | // A derived-class constructor beats an (inherited) base class constructor. | ||||
9293 | bool Cand1IsInherited = | ||||
9294 | dyn_cast_or_null<ConstructorUsingShadowDecl>(Cand1.FoundDecl.getDecl()); | ||||
9295 | bool Cand2IsInherited = | ||||
9296 | dyn_cast_or_null<ConstructorUsingShadowDecl>(Cand2.FoundDecl.getDecl()); | ||||
9297 | if (Cand1IsInherited != Cand2IsInherited) | ||||
9298 | return Cand2IsInherited; | ||||
9299 | else if (Cand1IsInherited) { | ||||
9300 | assert(Cand2IsInherited)((Cand2IsInherited) ? static_cast<void> (0) : __assert_fail ("Cand2IsInherited", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9300, __PRETTY_FUNCTION__)); | ||||
9301 | auto *Cand1Class = cast<CXXRecordDecl>(Cand1.Function->getDeclContext()); | ||||
9302 | auto *Cand2Class = cast<CXXRecordDecl>(Cand2.Function->getDeclContext()); | ||||
9303 | if (Cand1Class->isDerivedFrom(Cand2Class)) | ||||
9304 | return true; | ||||
9305 | if (Cand2Class->isDerivedFrom(Cand1Class)) | ||||
9306 | return false; | ||||
9307 | // Inherited from sibling base classes: still ambiguous. | ||||
9308 | } | ||||
9309 | |||||
9310 | // Check C++17 tie-breakers for deduction guides. | ||||
9311 | { | ||||
9312 | auto *Guide1 = dyn_cast_or_null<CXXDeductionGuideDecl>(Cand1.Function); | ||||
9313 | auto *Guide2 = dyn_cast_or_null<CXXDeductionGuideDecl>(Cand2.Function); | ||||
9314 | if (Guide1 && Guide2) { | ||||
9315 | // -- F1 is generated from a deduction-guide and F2 is not | ||||
9316 | if (Guide1->isImplicit() != Guide2->isImplicit()) | ||||
9317 | return Guide2->isImplicit(); | ||||
9318 | |||||
9319 | // -- F1 is the copy deduction candidate(16.3.1.8) and F2 is not | ||||
9320 | if (Guide1->isCopyDeductionCandidate()) | ||||
9321 | return true; | ||||
9322 | } | ||||
9323 | } | ||||
9324 | |||||
9325 | // Check for enable_if value-based overload resolution. | ||||
9326 | if (Cand1.Function && Cand2.Function) { | ||||
9327 | Comparison Cmp = compareEnableIfAttrs(S, Cand1.Function, Cand2.Function); | ||||
9328 | if (Cmp != Comparison::Equal) | ||||
9329 | return Cmp == Comparison::Better; | ||||
9330 | } | ||||
9331 | |||||
9332 | if (S.getLangOpts().CUDA && Cand1.Function && Cand2.Function) { | ||||
9333 | FunctionDecl *Caller = dyn_cast<FunctionDecl>(S.CurContext); | ||||
9334 | return S.IdentifyCUDAPreference(Caller, Cand1.Function) > | ||||
9335 | S.IdentifyCUDAPreference(Caller, Cand2.Function); | ||||
9336 | } | ||||
9337 | |||||
9338 | bool HasPS1 = Cand1.Function != nullptr && | ||||
9339 | functionHasPassObjectSizeParams(Cand1.Function); | ||||
9340 | bool HasPS2 = Cand2.Function != nullptr && | ||||
9341 | functionHasPassObjectSizeParams(Cand2.Function); | ||||
9342 | if (HasPS1 != HasPS2 && HasPS1) | ||||
9343 | return true; | ||||
9344 | |||||
9345 | return isBetterMultiversionCandidate(Cand1, Cand2); | ||||
9346 | } | ||||
9347 | |||||
9348 | /// Determine whether two declarations are "equivalent" for the purposes of | ||||
9349 | /// name lookup and overload resolution. This applies when the same internal/no | ||||
9350 | /// linkage entity is defined by two modules (probably by textually including | ||||
9351 | /// the same header). In such a case, we don't consider the declarations to | ||||
9352 | /// declare the same entity, but we also don't want lookups with both | ||||
9353 | /// declarations visible to be ambiguous in some cases (this happens when using | ||||
9354 | /// a modularized libstdc++). | ||||
9355 | bool Sema::isEquivalentInternalLinkageDeclaration(const NamedDecl *A, | ||||
9356 | const NamedDecl *B) { | ||||
9357 | auto *VA = dyn_cast_or_null<ValueDecl>(A); | ||||
9358 | auto *VB = dyn_cast_or_null<ValueDecl>(B); | ||||
9359 | if (!VA || !VB) | ||||
9360 | return false; | ||||
9361 | |||||
9362 | // The declarations must be declaring the same name as an internal linkage | ||||
9363 | // entity in different modules. | ||||
9364 | if (!VA->getDeclContext()->getRedeclContext()->Equals( | ||||
9365 | VB->getDeclContext()->getRedeclContext()) || | ||||
9366 | getOwningModule(const_cast<ValueDecl *>(VA)) == | ||||
9367 | getOwningModule(const_cast<ValueDecl *>(VB)) || | ||||
9368 | VA->isExternallyVisible() || VB->isExternallyVisible()) | ||||
9369 | return false; | ||||
9370 | |||||
9371 | // Check that the declarations appear to be equivalent. | ||||
9372 | // | ||||
9373 | // FIXME: Checking the type isn't really enough to resolve the ambiguity. | ||||
9374 | // For constants and functions, we should check the initializer or body is | ||||
9375 | // the same. For non-constant variables, we shouldn't allow it at all. | ||||
9376 | if (Context.hasSameType(VA->getType(), VB->getType())) | ||||
9377 | return true; | ||||
9378 | |||||
9379 | // Enum constants within unnamed enumerations will have different types, but | ||||
9380 | // may still be similar enough to be interchangeable for our purposes. | ||||
9381 | if (auto *EA = dyn_cast<EnumConstantDecl>(VA)) { | ||||
9382 | if (auto *EB = dyn_cast<EnumConstantDecl>(VB)) { | ||||
9383 | // Only handle anonymous enums. If the enumerations were named and | ||||
9384 | // equivalent, they would have been merged to the same type. | ||||
9385 | auto *EnumA = cast<EnumDecl>(EA->getDeclContext()); | ||||
9386 | auto *EnumB = cast<EnumDecl>(EB->getDeclContext()); | ||||
9387 | if (EnumA->hasNameForLinkage() || EnumB->hasNameForLinkage() || | ||||
9388 | !Context.hasSameType(EnumA->getIntegerType(), | ||||
9389 | EnumB->getIntegerType())) | ||||
9390 | return false; | ||||
9391 | // Allow this only if the value is the same for both enumerators. | ||||
9392 | return llvm::APSInt::isSameValue(EA->getInitVal(), EB->getInitVal()); | ||||
9393 | } | ||||
9394 | } | ||||
9395 | |||||
9396 | // Nothing else is sufficiently similar. | ||||
9397 | return false; | ||||
9398 | } | ||||
9399 | |||||
9400 | void Sema::diagnoseEquivalentInternalLinkageDeclarations( | ||||
9401 | SourceLocation Loc, const NamedDecl *D, ArrayRef<const NamedDecl *> Equiv) { | ||||
9402 | Diag(Loc, diag::ext_equivalent_internal_linkage_decl_in_modules) << D; | ||||
9403 | |||||
9404 | Module *M = getOwningModule(const_cast<NamedDecl*>(D)); | ||||
9405 | Diag(D->getLocation(), diag::note_equivalent_internal_linkage_decl) | ||||
9406 | << !M << (M ? M->getFullModuleName() : ""); | ||||
9407 | |||||
9408 | for (auto *E : Equiv) { | ||||
9409 | Module *M = getOwningModule(const_cast<NamedDecl*>(E)); | ||||
9410 | Diag(E->getLocation(), diag::note_equivalent_internal_linkage_decl) | ||||
9411 | << !M << (M ? M->getFullModuleName() : ""); | ||||
9412 | } | ||||
9413 | } | ||||
9414 | |||||
9415 | /// Computes the best viable function (C++ 13.3.3) | ||||
9416 | /// within an overload candidate set. | ||||
9417 | /// | ||||
9418 | /// \param Loc The location of the function name (or operator symbol) for | ||||
9419 | /// which overload resolution occurs. | ||||
9420 | /// | ||||
9421 | /// \param Best If overload resolution was successful or found a deleted | ||||
9422 | /// function, \p Best points to the candidate function found. | ||||
9423 | /// | ||||
9424 | /// \returns The result of overload resolution. | ||||
9425 | OverloadingResult | ||||
9426 | OverloadCandidateSet::BestViableFunction(Sema &S, SourceLocation Loc, | ||||
9427 | iterator &Best) { | ||||
9428 | llvm::SmallVector<OverloadCandidate *, 16> Candidates; | ||||
9429 | std::transform(begin(), end(), std::back_inserter(Candidates), | ||||
9430 | [](OverloadCandidate &Cand) { return &Cand; }); | ||||
9431 | |||||
9432 | // [CUDA] HD->H or HD->D calls are technically not allowed by CUDA but | ||||
9433 | // are accepted by both clang and NVCC. However, during a particular | ||||
9434 | // compilation mode only one call variant is viable. We need to | ||||
9435 | // exclude non-viable overload candidates from consideration based | ||||
9436 | // only on their host/device attributes. Specifically, if one | ||||
9437 | // candidate call is WrongSide and the other is SameSide, we ignore | ||||
9438 | // the WrongSide candidate. | ||||
9439 | if (S.getLangOpts().CUDA) { | ||||
9440 | const FunctionDecl *Caller = dyn_cast<FunctionDecl>(S.CurContext); | ||||
9441 | bool ContainsSameSideCandidate = | ||||
9442 | llvm::any_of(Candidates, [&](OverloadCandidate *Cand) { | ||||
9443 | // Check viable function only. | ||||
9444 | return Cand->Viable && Cand->Function && | ||||
9445 | S.IdentifyCUDAPreference(Caller, Cand->Function) == | ||||
9446 | Sema::CFP_SameSide; | ||||
9447 | }); | ||||
9448 | if (ContainsSameSideCandidate) { | ||||
9449 | auto IsWrongSideCandidate = [&](OverloadCandidate *Cand) { | ||||
9450 | // Check viable function only to avoid unnecessary data copying/moving. | ||||
9451 | return Cand->Viable && Cand->Function && | ||||
9452 | S.IdentifyCUDAPreference(Caller, Cand->Function) == | ||||
9453 | Sema::CFP_WrongSide; | ||||
9454 | }; | ||||
9455 | llvm::erase_if(Candidates, IsWrongSideCandidate); | ||||
9456 | } | ||||
9457 | } | ||||
9458 | |||||
9459 | // Find the best viable function. | ||||
9460 | Best = end(); | ||||
9461 | for (auto *Cand : Candidates) | ||||
9462 | if (Cand->Viable) | ||||
9463 | if (Best == end() || | ||||
9464 | isBetterOverloadCandidate(S, *Cand, *Best, Loc, Kind)) | ||||
9465 | Best = Cand; | ||||
9466 | |||||
9467 | // If we didn't find any viable functions, abort. | ||||
9468 | if (Best == end()) | ||||
9469 | return OR_No_Viable_Function; | ||||
9470 | |||||
9471 | llvm::SmallVector<const NamedDecl *, 4> EquivalentCands; | ||||
9472 | |||||
9473 | // Make sure that this function is better than every other viable | ||||
9474 | // function. If not, we have an ambiguity. | ||||
9475 | for (auto *Cand : Candidates) { | ||||
9476 | if (Cand->Viable && Cand != Best && | ||||
9477 | !isBetterOverloadCandidate(S, *Best, *Cand, Loc, Kind)) { | ||||
9478 | if (S.isEquivalentInternalLinkageDeclaration(Best->Function, | ||||
9479 | Cand->Function)) { | ||||
9480 | EquivalentCands.push_back(Cand->Function); | ||||
9481 | continue; | ||||
9482 | } | ||||
9483 | |||||
9484 | Best = end(); | ||||
9485 | return OR_Ambiguous; | ||||
9486 | } | ||||
9487 | } | ||||
9488 | |||||
9489 | // Best is the best viable function. | ||||
9490 | if (Best->Function && Best->Function->isDeleted()) | ||||
9491 | return OR_Deleted; | ||||
9492 | |||||
9493 | if (!EquivalentCands.empty()) | ||||
9494 | S.diagnoseEquivalentInternalLinkageDeclarations(Loc, Best->Function, | ||||
9495 | EquivalentCands); | ||||
9496 | |||||
9497 | return OR_Success; | ||||
9498 | } | ||||
9499 | |||||
9500 | namespace { | ||||
9501 | |||||
9502 | enum OverloadCandidateKind { | ||||
9503 | oc_function, | ||||
9504 | oc_method, | ||||
9505 | oc_constructor, | ||||
9506 | oc_implicit_default_constructor, | ||||
9507 | oc_implicit_copy_constructor, | ||||
9508 | oc_implicit_move_constructor, | ||||
9509 | oc_implicit_copy_assignment, | ||||
9510 | oc_implicit_move_assignment, | ||||
9511 | oc_inherited_constructor | ||||
9512 | }; | ||||
9513 | |||||
9514 | enum OverloadCandidateSelect { | ||||
9515 | ocs_non_template, | ||||
9516 | ocs_template, | ||||
9517 | ocs_described_template, | ||||
9518 | }; | ||||
9519 | |||||
9520 | static std::pair<OverloadCandidateKind, OverloadCandidateSelect> | ||||
9521 | ClassifyOverloadCandidate(Sema &S, NamedDecl *Found, FunctionDecl *Fn, | ||||
9522 | std::string &Description) { | ||||
9523 | |||||
9524 | bool isTemplate = Fn->isTemplateDecl() || Found->isTemplateDecl(); | ||||
9525 | if (FunctionTemplateDecl *FunTmpl = Fn->getPrimaryTemplate()) { | ||||
9526 | isTemplate = true; | ||||
9527 | Description = S.getTemplateArgumentBindingsText( | ||||
9528 | FunTmpl->getTemplateParameters(), *Fn->getTemplateSpecializationArgs()); | ||||
9529 | } | ||||
9530 | |||||
9531 | OverloadCandidateSelect Select = [&]() { | ||||
9532 | if (!Description.empty()) | ||||
9533 | return ocs_described_template; | ||||
9534 | return isTemplate ? ocs_template : ocs_non_template; | ||||
9535 | }(); | ||||
9536 | |||||
9537 | OverloadCandidateKind Kind = [&]() { | ||||
9538 | if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(Fn)) { | ||||
9539 | if (!Ctor->isImplicit()) { | ||||
9540 | if (isa<ConstructorUsingShadowDecl>(Found)) | ||||
9541 | return oc_inherited_constructor; | ||||
9542 | else | ||||
9543 | return oc_constructor; | ||||
9544 | } | ||||
9545 | |||||
9546 | if (Ctor->isDefaultConstructor()) | ||||
9547 | return oc_implicit_default_constructor; | ||||
9548 | |||||
9549 | if (Ctor->isMoveConstructor()) | ||||
9550 | return oc_implicit_move_constructor; | ||||
9551 | |||||
9552 | assert(Ctor->isCopyConstructor() &&((Ctor->isCopyConstructor() && "unexpected sort of implicit constructor" ) ? static_cast<void> (0) : __assert_fail ("Ctor->isCopyConstructor() && \"unexpected sort of implicit constructor\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9553, __PRETTY_FUNCTION__)) | ||||
9553 | "unexpected sort of implicit constructor")((Ctor->isCopyConstructor() && "unexpected sort of implicit constructor" ) ? static_cast<void> (0) : __assert_fail ("Ctor->isCopyConstructor() && \"unexpected sort of implicit constructor\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9553, __PRETTY_FUNCTION__)); | ||||
9554 | return oc_implicit_copy_constructor; | ||||
9555 | } | ||||
9556 | |||||
9557 | if (CXXMethodDecl *Meth = dyn_cast<CXXMethodDecl>(Fn)) { | ||||
9558 | // This actually gets spelled 'candidate function' for now, but | ||||
9559 | // it doesn't hurt to split it out. | ||||
9560 | if (!Meth->isImplicit()) | ||||
9561 | return oc_method; | ||||
9562 | |||||
9563 | if (Meth->isMoveAssignmentOperator()) | ||||
9564 | return oc_implicit_move_assignment; | ||||
9565 | |||||
9566 | if (Meth->isCopyAssignmentOperator()) | ||||
9567 | return oc_implicit_copy_assignment; | ||||
9568 | |||||
9569 | assert(isa<CXXConversionDecl>(Meth) && "expected conversion")((isa<CXXConversionDecl>(Meth) && "expected conversion" ) ? static_cast<void> (0) : __assert_fail ("isa<CXXConversionDecl>(Meth) && \"expected conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9569, __PRETTY_FUNCTION__)); | ||||
9570 | return oc_method; | ||||
9571 | } | ||||
9572 | |||||
9573 | return oc_function; | ||||
9574 | }(); | ||||
9575 | |||||
9576 | return std::make_pair(Kind, Select); | ||||
9577 | } | ||||
9578 | |||||
9579 | void MaybeEmitInheritedConstructorNote(Sema &S, Decl *FoundDecl) { | ||||
9580 | // FIXME: It'd be nice to only emit a note once per using-decl per overload | ||||
9581 | // set. | ||||
9582 | if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl)) | ||||
9583 | S.Diag(FoundDecl->getLocation(), | ||||
9584 | diag::note_ovl_candidate_inherited_constructor) | ||||
9585 | << Shadow->getNominatedBaseClass(); | ||||
9586 | } | ||||
9587 | |||||
9588 | } // end anonymous namespace | ||||
9589 | |||||
9590 | static bool isFunctionAlwaysEnabled(const ASTContext &Ctx, | ||||
9591 | const FunctionDecl *FD) { | ||||
9592 | for (auto *EnableIf : FD->specific_attrs<EnableIfAttr>()) { | ||||
9593 | bool AlwaysTrue; | ||||
9594 | if (EnableIf->getCond()->isValueDependent() || | ||||
9595 | !EnableIf->getCond()->EvaluateAsBooleanCondition(AlwaysTrue, Ctx)) | ||||
9596 | return false; | ||||
9597 | if (!AlwaysTrue) | ||||
9598 | return false; | ||||
9599 | } | ||||
9600 | return true; | ||||
9601 | } | ||||
9602 | |||||
9603 | /// Returns true if we can take the address of the function. | ||||
9604 | /// | ||||
9605 | /// \param Complain - If true, we'll emit a diagnostic | ||||
9606 | /// \param InOverloadResolution - For the purposes of emitting a diagnostic, are | ||||
9607 | /// we in overload resolution? | ||||
9608 | /// \param Loc - The location of the statement we're complaining about. Ignored | ||||
9609 | /// if we're not complaining, or if we're in overload resolution. | ||||
9610 | static bool checkAddressOfFunctionIsAvailable(Sema &S, const FunctionDecl *FD, | ||||
9611 | bool Complain, | ||||
9612 | bool InOverloadResolution, | ||||
9613 | SourceLocation Loc) { | ||||
9614 | if (!isFunctionAlwaysEnabled(S.Context, FD)) { | ||||
9615 | if (Complain) { | ||||
9616 | if (InOverloadResolution) | ||||
9617 | S.Diag(FD->getBeginLoc(), | ||||
9618 | diag::note_addrof_ovl_candidate_disabled_by_enable_if_attr); | ||||
9619 | else | ||||
9620 | S.Diag(Loc, diag::err_addrof_function_disabled_by_enable_if_attr) << FD; | ||||
9621 | } | ||||
9622 | return false; | ||||
9623 | } | ||||
9624 | |||||
9625 | auto I = llvm::find_if(FD->parameters(), [](const ParmVarDecl *P) { | ||||
9626 | return P->hasAttr<PassObjectSizeAttr>(); | ||||
9627 | }); | ||||
9628 | if (I == FD->param_end()) | ||||
9629 | return true; | ||||
9630 | |||||
9631 | if (Complain) { | ||||
9632 | // Add one to ParamNo because it's user-facing | ||||
9633 | unsigned ParamNo = std::distance(FD->param_begin(), I) + 1; | ||||
9634 | if (InOverloadResolution) | ||||
9635 | S.Diag(FD->getLocation(), | ||||
9636 | diag::note_ovl_candidate_has_pass_object_size_params) | ||||
9637 | << ParamNo; | ||||
9638 | else | ||||
9639 | S.Diag(Loc, diag::err_address_of_function_with_pass_object_size_params) | ||||
9640 | << FD << ParamNo; | ||||
9641 | } | ||||
9642 | return false; | ||||
9643 | } | ||||
9644 | |||||
9645 | static bool checkAddressOfCandidateIsAvailable(Sema &S, | ||||
9646 | const FunctionDecl *FD) { | ||||
9647 | return checkAddressOfFunctionIsAvailable(S, FD, /*Complain=*/true, | ||||
9648 | /*InOverloadResolution=*/true, | ||||
9649 | /*Loc=*/SourceLocation()); | ||||
9650 | } | ||||
9651 | |||||
9652 | bool Sema::checkAddressOfFunctionIsAvailable(const FunctionDecl *Function, | ||||
9653 | bool Complain, | ||||
9654 | SourceLocation Loc) { | ||||
9655 | return ::checkAddressOfFunctionIsAvailable(*this, Function, Complain, | ||||
9656 | /*InOverloadResolution=*/false, | ||||
9657 | Loc); | ||||
9658 | } | ||||
9659 | |||||
9660 | // Notes the location of an overload candidate. | ||||
9661 | void Sema::NoteOverloadCandidate(NamedDecl *Found, FunctionDecl *Fn, | ||||
9662 | QualType DestType, bool TakingAddress) { | ||||
9663 | if (TakingAddress && !checkAddressOfCandidateIsAvailable(*this, Fn)) | ||||
9664 | return; | ||||
9665 | if (Fn->isMultiVersion() && Fn->hasAttr<TargetAttr>() && | ||||
9666 | !Fn->getAttr<TargetAttr>()->isDefaultVersion()) | ||||
9667 | return; | ||||
9668 | |||||
9669 | std::string FnDesc; | ||||
9670 | std::pair<OverloadCandidateKind, OverloadCandidateSelect> KSPair = | ||||
9671 | ClassifyOverloadCandidate(*this, Found, Fn, FnDesc); | ||||
9672 | PartialDiagnostic PD = PDiag(diag::note_ovl_candidate) | ||||
9673 | << (unsigned)KSPair.first << (unsigned)KSPair.second | ||||
9674 | << Fn << FnDesc; | ||||
9675 | |||||
9676 | HandleFunctionTypeMismatch(PD, Fn->getType(), DestType); | ||||
9677 | Diag(Fn->getLocation(), PD); | ||||
9678 | MaybeEmitInheritedConstructorNote(*this, Found); | ||||
9679 | } | ||||
9680 | |||||
9681 | // Notes the location of all overload candidates designated through | ||||
9682 | // OverloadedExpr | ||||
9683 | void Sema::NoteAllOverloadCandidates(Expr *OverloadedExpr, QualType DestType, | ||||
9684 | bool TakingAddress) { | ||||
9685 | assert(OverloadedExpr->getType() == Context.OverloadTy)((OverloadedExpr->getType() == Context.OverloadTy) ? static_cast <void> (0) : __assert_fail ("OverloadedExpr->getType() == Context.OverloadTy" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9685, __PRETTY_FUNCTION__)); | ||||
9686 | |||||
9687 | OverloadExpr::FindResult Ovl = OverloadExpr::find(OverloadedExpr); | ||||
9688 | OverloadExpr *OvlExpr = Ovl.Expression; | ||||
9689 | |||||
9690 | for (UnresolvedSetIterator I = OvlExpr->decls_begin(), | ||||
9691 | IEnd = OvlExpr->decls_end(); | ||||
9692 | I != IEnd; ++I) { | ||||
9693 | if (FunctionTemplateDecl *FunTmpl = | ||||
9694 | dyn_cast<FunctionTemplateDecl>((*I)->getUnderlyingDecl()) ) { | ||||
9695 | NoteOverloadCandidate(*I, FunTmpl->getTemplatedDecl(), DestType, | ||||
9696 | TakingAddress); | ||||
9697 | } else if (FunctionDecl *Fun | ||||
9698 | = dyn_cast<FunctionDecl>((*I)->getUnderlyingDecl()) ) { | ||||
9699 | NoteOverloadCandidate(*I, Fun, DestType, TakingAddress); | ||||
9700 | } | ||||
9701 | } | ||||
9702 | } | ||||
9703 | |||||
9704 | /// Diagnoses an ambiguous conversion. The partial diagnostic is the | ||||
9705 | /// "lead" diagnostic; it will be given two arguments, the source and | ||||
9706 | /// target types of the conversion. | ||||
9707 | void ImplicitConversionSequence::DiagnoseAmbiguousConversion( | ||||
9708 | Sema &S, | ||||
9709 | SourceLocation CaretLoc, | ||||
9710 | const PartialDiagnostic &PDiag) const { | ||||
9711 | S.Diag(CaretLoc, PDiag) | ||||
9712 | << Ambiguous.getFromType() << Ambiguous.getToType(); | ||||
9713 | // FIXME: The note limiting machinery is borrowed from | ||||
9714 | // OverloadCandidateSet::NoteCandidates; there's an opportunity for | ||||
9715 | // refactoring here. | ||||
9716 | const OverloadsShown ShowOverloads = S.Diags.getShowOverloads(); | ||||
9717 | unsigned CandsShown = 0; | ||||
9718 | AmbiguousConversionSequence::const_iterator I, E; | ||||
9719 | for (I = Ambiguous.begin(), E = Ambiguous.end(); I != E; ++I) { | ||||
9720 | if (CandsShown >= 4 && ShowOverloads == Ovl_Best) | ||||
9721 | break; | ||||
9722 | ++CandsShown; | ||||
9723 | S.NoteOverloadCandidate(I->first, I->second); | ||||
9724 | } | ||||
9725 | if (I != E) | ||||
9726 | S.Diag(SourceLocation(), diag::note_ovl_too_many_candidates) << int(E - I); | ||||
9727 | } | ||||
9728 | |||||
9729 | static void DiagnoseBadConversion(Sema &S, OverloadCandidate *Cand, | ||||
9730 | unsigned I, bool TakingCandidateAddress) { | ||||
9731 | const ImplicitConversionSequence &Conv = Cand->Conversions[I]; | ||||
9732 | assert(Conv.isBad())((Conv.isBad()) ? static_cast<void> (0) : __assert_fail ("Conv.isBad()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9732, __PRETTY_FUNCTION__)); | ||||
9733 | assert(Cand->Function && "for now, candidate must be a function")((Cand->Function && "for now, candidate must be a function" ) ? static_cast<void> (0) : __assert_fail ("Cand->Function && \"for now, candidate must be a function\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9733, __PRETTY_FUNCTION__)); | ||||
9734 | FunctionDecl *Fn = Cand->Function; | ||||
9735 | |||||
9736 | // There's a conversion slot for the object argument if this is a | ||||
9737 | // non-constructor method. Note that 'I' corresponds the | ||||
9738 | // conversion-slot index. | ||||
9739 | bool isObjectArgument = false; | ||||
9740 | if (isa<CXXMethodDecl>(Fn) && !isa<CXXConstructorDecl>(Fn)) { | ||||
9741 | if (I == 0) | ||||
9742 | isObjectArgument = true; | ||||
9743 | else | ||||
9744 | I--; | ||||
9745 | } | ||||
9746 | |||||
9747 | std::string FnDesc; | ||||
9748 | std::pair<OverloadCandidateKind, OverloadCandidateSelect> FnKindPair = | ||||
9749 | ClassifyOverloadCandidate(S, Cand->FoundDecl, Fn, FnDesc); | ||||
9750 | |||||
9751 | Expr *FromExpr = Conv.Bad.FromExpr; | ||||
9752 | QualType FromTy = Conv.Bad.getFromType(); | ||||
9753 | QualType ToTy = Conv.Bad.getToType(); | ||||
9754 | |||||
9755 | if (FromTy == S.Context.OverloadTy) { | ||||
9756 | assert(FromExpr && "overload set argument came from implicit argument?")((FromExpr && "overload set argument came from implicit argument?" ) ? static_cast<void> (0) : __assert_fail ("FromExpr && \"overload set argument came from implicit argument?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9756, __PRETTY_FUNCTION__)); | ||||
9757 | Expr *E = FromExpr->IgnoreParens(); | ||||
9758 | if (isa<UnaryOperator>(E)) | ||||
9759 | E = cast<UnaryOperator>(E)->getSubExpr()->IgnoreParens(); | ||||
9760 | DeclarationName Name = cast<OverloadExpr>(E)->getName(); | ||||
9761 | |||||
9762 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_overload) | ||||
9763 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9764 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << ToTy | ||||
9765 | << Name << I + 1; | ||||
9766 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9767 | return; | ||||
9768 | } | ||||
9769 | |||||
9770 | // Do some hand-waving analysis to see if the non-viability is due | ||||
9771 | // to a qualifier mismatch. | ||||
9772 | CanQualType CFromTy = S.Context.getCanonicalType(FromTy); | ||||
9773 | CanQualType CToTy = S.Context.getCanonicalType(ToTy); | ||||
9774 | if (CanQual<ReferenceType> RT = CToTy->getAs<ReferenceType>()) | ||||
9775 | CToTy = RT->getPointeeType(); | ||||
9776 | else { | ||||
9777 | // TODO: detect and diagnose the full richness of const mismatches. | ||||
9778 | if (CanQual<PointerType> FromPT = CFromTy->getAs<PointerType>()) | ||||
9779 | if (CanQual<PointerType> ToPT = CToTy->getAs<PointerType>()) { | ||||
9780 | CFromTy = FromPT->getPointeeType(); | ||||
9781 | CToTy = ToPT->getPointeeType(); | ||||
9782 | } | ||||
9783 | } | ||||
9784 | |||||
9785 | if (CToTy.getUnqualifiedType() == CFromTy.getUnqualifiedType() && | ||||
9786 | !CToTy.isAtLeastAsQualifiedAs(CFromTy)) { | ||||
9787 | Qualifiers FromQs = CFromTy.getQualifiers(); | ||||
9788 | Qualifiers ToQs = CToTy.getQualifiers(); | ||||
9789 | |||||
9790 | if (FromQs.getAddressSpace() != ToQs.getAddressSpace()) { | ||||
9791 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_addrspace) | ||||
9792 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9793 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << FromTy | ||||
9794 | << ToTy << (unsigned)isObjectArgument << I + 1; | ||||
9795 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9796 | return; | ||||
9797 | } | ||||
9798 | |||||
9799 | if (FromQs.getObjCLifetime() != ToQs.getObjCLifetime()) { | ||||
9800 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_ownership) | ||||
9801 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9802 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << FromTy | ||||
9803 | << FromQs.getObjCLifetime() << ToQs.getObjCLifetime() | ||||
9804 | << (unsigned)isObjectArgument << I + 1; | ||||
9805 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9806 | return; | ||||
9807 | } | ||||
9808 | |||||
9809 | if (FromQs.getObjCGCAttr() != ToQs.getObjCGCAttr()) { | ||||
9810 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_gc) | ||||
9811 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9812 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << FromTy | ||||
9813 | << FromQs.getObjCGCAttr() << ToQs.getObjCGCAttr() | ||||
9814 | << (unsigned)isObjectArgument << I + 1; | ||||
9815 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9816 | return; | ||||
9817 | } | ||||
9818 | |||||
9819 | if (FromQs.hasUnaligned() != ToQs.hasUnaligned()) { | ||||
9820 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_unaligned) | ||||
9821 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9822 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << FromTy | ||||
9823 | << FromQs.hasUnaligned() << I + 1; | ||||
9824 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9825 | return; | ||||
9826 | } | ||||
9827 | |||||
9828 | unsigned CVR = FromQs.getCVRQualifiers() & ~ToQs.getCVRQualifiers(); | ||||
9829 | assert(CVR && "unexpected qualifiers mismatch")((CVR && "unexpected qualifiers mismatch") ? static_cast <void> (0) : __assert_fail ("CVR && \"unexpected qualifiers mismatch\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9829, __PRETTY_FUNCTION__)); | ||||
9830 | |||||
9831 | if (isObjectArgument) { | ||||
9832 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_cvr_this) | ||||
9833 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9834 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << FromTy | ||||
9835 | << (CVR - 1); | ||||
9836 | } else { | ||||
9837 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_cvr) | ||||
9838 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9839 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << FromTy | ||||
9840 | << (CVR - 1) << I + 1; | ||||
9841 | } | ||||
9842 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9843 | return; | ||||
9844 | } | ||||
9845 | |||||
9846 | // Special diagnostic for failure to convert an initializer list, since | ||||
9847 | // telling the user that it has type void is not useful. | ||||
9848 | if (FromExpr && isa<InitListExpr>(FromExpr)) { | ||||
9849 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_list_argument) | ||||
9850 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9851 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << FromTy | ||||
9852 | << ToTy << (unsigned)isObjectArgument << I + 1; | ||||
9853 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9854 | return; | ||||
9855 | } | ||||
9856 | |||||
9857 | // Diagnose references or pointers to incomplete types differently, | ||||
9858 | // since it's far from impossible that the incompleteness triggered | ||||
9859 | // the failure. | ||||
9860 | QualType TempFromTy = FromTy.getNonReferenceType(); | ||||
9861 | if (const PointerType *PTy = TempFromTy->getAs<PointerType>()) | ||||
9862 | TempFromTy = PTy->getPointeeType(); | ||||
9863 | if (TempFromTy->isIncompleteType()) { | ||||
9864 | // Emit the generic diagnostic and, optionally, add the hints to it. | ||||
9865 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_conv_incomplete) | ||||
9866 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9867 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << FromTy | ||||
9868 | << ToTy << (unsigned)isObjectArgument << I + 1 | ||||
9869 | << (unsigned)(Cand->Fix.Kind); | ||||
9870 | |||||
9871 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9872 | return; | ||||
9873 | } | ||||
9874 | |||||
9875 | // Diagnose base -> derived pointer conversions. | ||||
9876 | unsigned BaseToDerivedConversion = 0; | ||||
9877 | if (const PointerType *FromPtrTy = FromTy->getAs<PointerType>()) { | ||||
9878 | if (const PointerType *ToPtrTy = ToTy->getAs<PointerType>()) { | ||||
9879 | if (ToPtrTy->getPointeeType().isAtLeastAsQualifiedAs( | ||||
9880 | FromPtrTy->getPointeeType()) && | ||||
9881 | !FromPtrTy->getPointeeType()->isIncompleteType() && | ||||
9882 | !ToPtrTy->getPointeeType()->isIncompleteType() && | ||||
9883 | S.IsDerivedFrom(SourceLocation(), ToPtrTy->getPointeeType(), | ||||
9884 | FromPtrTy->getPointeeType())) | ||||
9885 | BaseToDerivedConversion = 1; | ||||
9886 | } | ||||
9887 | } else if (const ObjCObjectPointerType *FromPtrTy | ||||
9888 | = FromTy->getAs<ObjCObjectPointerType>()) { | ||||
9889 | if (const ObjCObjectPointerType *ToPtrTy | ||||
9890 | = ToTy->getAs<ObjCObjectPointerType>()) | ||||
9891 | if (const ObjCInterfaceDecl *FromIface = FromPtrTy->getInterfaceDecl()) | ||||
9892 | if (const ObjCInterfaceDecl *ToIface = ToPtrTy->getInterfaceDecl()) | ||||
9893 | if (ToPtrTy->getPointeeType().isAtLeastAsQualifiedAs( | ||||
9894 | FromPtrTy->getPointeeType()) && | ||||
9895 | FromIface->isSuperClassOf(ToIface)) | ||||
9896 | BaseToDerivedConversion = 2; | ||||
9897 | } else if (const ReferenceType *ToRefTy = ToTy->getAs<ReferenceType>()) { | ||||
9898 | if (ToRefTy->getPointeeType().isAtLeastAsQualifiedAs(FromTy) && | ||||
9899 | !FromTy->isIncompleteType() && | ||||
9900 | !ToRefTy->getPointeeType()->isIncompleteType() && | ||||
9901 | S.IsDerivedFrom(SourceLocation(), ToRefTy->getPointeeType(), FromTy)) { | ||||
9902 | BaseToDerivedConversion = 3; | ||||
9903 | } else if (ToTy->isLValueReferenceType() && !FromExpr->isLValue() && | ||||
9904 | ToTy.getNonReferenceType().getCanonicalType() == | ||||
9905 | FromTy.getNonReferenceType().getCanonicalType()) { | ||||
9906 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_lvalue) | ||||
9907 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9908 | << (unsigned)isObjectArgument << I + 1 | ||||
9909 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()); | ||||
9910 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9911 | return; | ||||
9912 | } | ||||
9913 | } | ||||
9914 | |||||
9915 | if (BaseToDerivedConversion) { | ||||
9916 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_base_to_derived_conv) | ||||
9917 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9918 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) | ||||
9919 | << (BaseToDerivedConversion - 1) << FromTy << ToTy << I + 1; | ||||
9920 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9921 | return; | ||||
9922 | } | ||||
9923 | |||||
9924 | if (isa<ObjCObjectPointerType>(CFromTy) && | ||||
9925 | isa<PointerType>(CToTy)) { | ||||
9926 | Qualifiers FromQs = CFromTy.getQualifiers(); | ||||
9927 | Qualifiers ToQs = CToTy.getQualifiers(); | ||||
9928 | if (FromQs.getObjCLifetime() != ToQs.getObjCLifetime()) { | ||||
9929 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_bad_arc_conv) | ||||
9930 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second | ||||
9931 | << FnDesc << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) | ||||
9932 | << FromTy << ToTy << (unsigned)isObjectArgument << I + 1; | ||||
9933 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9934 | return; | ||||
9935 | } | ||||
9936 | } | ||||
9937 | |||||
9938 | if (TakingCandidateAddress && | ||||
9939 | !checkAddressOfCandidateIsAvailable(S, Cand->Function)) | ||||
9940 | return; | ||||
9941 | |||||
9942 | // Emit the generic diagnostic and, optionally, add the hints to it. | ||||
9943 | PartialDiagnostic FDiag = S.PDiag(diag::note_ovl_candidate_bad_conv); | ||||
9944 | FDiag << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
9945 | << (FromExpr ? FromExpr->getSourceRange() : SourceRange()) << FromTy | ||||
9946 | << ToTy << (unsigned)isObjectArgument << I + 1 | ||||
9947 | << (unsigned)(Cand->Fix.Kind); | ||||
9948 | |||||
9949 | // If we can fix the conversion, suggest the FixIts. | ||||
9950 | for (std::vector<FixItHint>::iterator HI = Cand->Fix.Hints.begin(), | ||||
9951 | HE = Cand->Fix.Hints.end(); HI != HE; ++HI) | ||||
9952 | FDiag << *HI; | ||||
9953 | S.Diag(Fn->getLocation(), FDiag); | ||||
9954 | |||||
9955 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
9956 | } | ||||
9957 | |||||
9958 | /// Additional arity mismatch diagnosis specific to a function overload | ||||
9959 | /// candidates. This is not covered by the more general DiagnoseArityMismatch() | ||||
9960 | /// over a candidate in any candidate set. | ||||
9961 | static bool CheckArityMismatch(Sema &S, OverloadCandidate *Cand, | ||||
9962 | unsigned NumArgs) { | ||||
9963 | FunctionDecl *Fn = Cand->Function; | ||||
9964 | unsigned MinParams = Fn->getMinRequiredArguments(); | ||||
9965 | |||||
9966 | // With invalid overloaded operators, it's possible that we think we | ||||
9967 | // have an arity mismatch when in fact it looks like we have the | ||||
9968 | // right number of arguments, because only overloaded operators have | ||||
9969 | // the weird behavior of overloading member and non-member functions. | ||||
9970 | // Just don't report anything. | ||||
9971 | if (Fn->isInvalidDecl() && | ||||
9972 | Fn->getDeclName().getNameKind() == DeclarationName::CXXOperatorName) | ||||
9973 | return true; | ||||
9974 | |||||
9975 | if (NumArgs < MinParams) { | ||||
9976 | assert((Cand->FailureKind == ovl_fail_too_few_arguments) ||(((Cand->FailureKind == ovl_fail_too_few_arguments) || (Cand ->FailureKind == ovl_fail_bad_deduction && Cand-> DeductionFailure.Result == Sema::TDK_TooFewArguments)) ? static_cast <void> (0) : __assert_fail ("(Cand->FailureKind == ovl_fail_too_few_arguments) || (Cand->FailureKind == ovl_fail_bad_deduction && Cand->DeductionFailure.Result == Sema::TDK_TooFewArguments)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9978, __PRETTY_FUNCTION__)) | ||||
9977 | (Cand->FailureKind == ovl_fail_bad_deduction &&(((Cand->FailureKind == ovl_fail_too_few_arguments) || (Cand ->FailureKind == ovl_fail_bad_deduction && Cand-> DeductionFailure.Result == Sema::TDK_TooFewArguments)) ? static_cast <void> (0) : __assert_fail ("(Cand->FailureKind == ovl_fail_too_few_arguments) || (Cand->FailureKind == ovl_fail_bad_deduction && Cand->DeductionFailure.Result == Sema::TDK_TooFewArguments)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9978, __PRETTY_FUNCTION__)) | ||||
9978 | Cand->DeductionFailure.Result == Sema::TDK_TooFewArguments))(((Cand->FailureKind == ovl_fail_too_few_arguments) || (Cand ->FailureKind == ovl_fail_bad_deduction && Cand-> DeductionFailure.Result == Sema::TDK_TooFewArguments)) ? static_cast <void> (0) : __assert_fail ("(Cand->FailureKind == ovl_fail_too_few_arguments) || (Cand->FailureKind == ovl_fail_bad_deduction && Cand->DeductionFailure.Result == Sema::TDK_TooFewArguments)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9978, __PRETTY_FUNCTION__)); | ||||
9979 | } else { | ||||
9980 | assert((Cand->FailureKind == ovl_fail_too_many_arguments) ||(((Cand->FailureKind == ovl_fail_too_many_arguments) || (Cand ->FailureKind == ovl_fail_bad_deduction && Cand-> DeductionFailure.Result == Sema::TDK_TooManyArguments)) ? static_cast <void> (0) : __assert_fail ("(Cand->FailureKind == ovl_fail_too_many_arguments) || (Cand->FailureKind == ovl_fail_bad_deduction && Cand->DeductionFailure.Result == Sema::TDK_TooManyArguments)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9982, __PRETTY_FUNCTION__)) | ||||
9981 | (Cand->FailureKind == ovl_fail_bad_deduction &&(((Cand->FailureKind == ovl_fail_too_many_arguments) || (Cand ->FailureKind == ovl_fail_bad_deduction && Cand-> DeductionFailure.Result == Sema::TDK_TooManyArguments)) ? static_cast <void> (0) : __assert_fail ("(Cand->FailureKind == ovl_fail_too_many_arguments) || (Cand->FailureKind == ovl_fail_bad_deduction && Cand->DeductionFailure.Result == Sema::TDK_TooManyArguments)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9982, __PRETTY_FUNCTION__)) | ||||
9982 | Cand->DeductionFailure.Result == Sema::TDK_TooManyArguments))(((Cand->FailureKind == ovl_fail_too_many_arguments) || (Cand ->FailureKind == ovl_fail_bad_deduction && Cand-> DeductionFailure.Result == Sema::TDK_TooManyArguments)) ? static_cast <void> (0) : __assert_fail ("(Cand->FailureKind == ovl_fail_too_many_arguments) || (Cand->FailureKind == ovl_fail_bad_deduction && Cand->DeductionFailure.Result == Sema::TDK_TooManyArguments)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9982, __PRETTY_FUNCTION__)); | ||||
9983 | } | ||||
9984 | |||||
9985 | return false; | ||||
9986 | } | ||||
9987 | |||||
9988 | /// General arity mismatch diagnosis over a candidate in a candidate set. | ||||
9989 | static void DiagnoseArityMismatch(Sema &S, NamedDecl *Found, Decl *D, | ||||
9990 | unsigned NumFormalArgs) { | ||||
9991 | assert(isa<FunctionDecl>(D) &&((isa<FunctionDecl>(D) && "The templated declaration should at least be a function" " when diagnosing bad template argument deduction due to too many" " or too few arguments") ? static_cast<void> (0) : __assert_fail ("isa<FunctionDecl>(D) && \"The templated declaration should at least be a function\" \" when diagnosing bad template argument deduction due to too many\" \" or too few arguments\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9994, __PRETTY_FUNCTION__)) | ||||
9992 | "The templated declaration should at least be a function"((isa<FunctionDecl>(D) && "The templated declaration should at least be a function" " when diagnosing bad template argument deduction due to too many" " or too few arguments") ? static_cast<void> (0) : __assert_fail ("isa<FunctionDecl>(D) && \"The templated declaration should at least be a function\" \" when diagnosing bad template argument deduction due to too many\" \" or too few arguments\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9994, __PRETTY_FUNCTION__)) | ||||
9993 | " when diagnosing bad template argument deduction due to too many"((isa<FunctionDecl>(D) && "The templated declaration should at least be a function" " when diagnosing bad template argument deduction due to too many" " or too few arguments") ? static_cast<void> (0) : __assert_fail ("isa<FunctionDecl>(D) && \"The templated declaration should at least be a function\" \" when diagnosing bad template argument deduction due to too many\" \" or too few arguments\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9994, __PRETTY_FUNCTION__)) | ||||
9994 | " or too few arguments")((isa<FunctionDecl>(D) && "The templated declaration should at least be a function" " when diagnosing bad template argument deduction due to too many" " or too few arguments") ? static_cast<void> (0) : __assert_fail ("isa<FunctionDecl>(D) && \"The templated declaration should at least be a function\" \" when diagnosing bad template argument deduction due to too many\" \" or too few arguments\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 9994, __PRETTY_FUNCTION__)); | ||||
9995 | |||||
9996 | FunctionDecl *Fn = cast<FunctionDecl>(D); | ||||
9997 | |||||
9998 | // TODO: treat calls to a missing default constructor as a special case | ||||
9999 | const FunctionProtoType *FnTy = Fn->getType()->getAs<FunctionProtoType>(); | ||||
10000 | unsigned MinParams = Fn->getMinRequiredArguments(); | ||||
10001 | |||||
10002 | // at least / at most / exactly | ||||
10003 | unsigned mode, modeCount; | ||||
10004 | if (NumFormalArgs < MinParams) { | ||||
10005 | if (MinParams != FnTy->getNumParams() || FnTy->isVariadic() || | ||||
10006 | FnTy->isTemplateVariadic()) | ||||
10007 | mode = 0; // "at least" | ||||
10008 | else | ||||
10009 | mode = 2; // "exactly" | ||||
10010 | modeCount = MinParams; | ||||
10011 | } else { | ||||
10012 | if (MinParams != FnTy->getNumParams()) | ||||
10013 | mode = 1; // "at most" | ||||
10014 | else | ||||
10015 | mode = 2; // "exactly" | ||||
10016 | modeCount = FnTy->getNumParams(); | ||||
10017 | } | ||||
10018 | |||||
10019 | std::string Description; | ||||
10020 | std::pair<OverloadCandidateKind, OverloadCandidateSelect> FnKindPair = | ||||
10021 | ClassifyOverloadCandidate(S, Found, Fn, Description); | ||||
10022 | |||||
10023 | if (modeCount == 1 && Fn->getParamDecl(0)->getDeclName()) | ||||
10024 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_arity_one) | ||||
10025 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second | ||||
10026 | << Description << mode << Fn->getParamDecl(0) << NumFormalArgs; | ||||
10027 | else | ||||
10028 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_arity) | ||||
10029 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second | ||||
10030 | << Description << mode << modeCount << NumFormalArgs; | ||||
10031 | |||||
10032 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10033 | } | ||||
10034 | |||||
10035 | /// Arity mismatch diagnosis specific to a function overload candidate. | ||||
10036 | static void DiagnoseArityMismatch(Sema &S, OverloadCandidate *Cand, | ||||
10037 | unsigned NumFormalArgs) { | ||||
10038 | if (!CheckArityMismatch(S, Cand, NumFormalArgs)) | ||||
10039 | DiagnoseArityMismatch(S, Cand->FoundDecl, Cand->Function, NumFormalArgs); | ||||
10040 | } | ||||
10041 | |||||
10042 | static TemplateDecl *getDescribedTemplate(Decl *Templated) { | ||||
10043 | if (TemplateDecl *TD = Templated->getDescribedTemplate()) | ||||
10044 | return TD; | ||||
10045 | llvm_unreachable("Unsupported: Getting the described template declaration"::llvm::llvm_unreachable_internal("Unsupported: Getting the described template declaration" " for bad deduction diagnosis", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10046) | ||||
10046 | " for bad deduction diagnosis")::llvm::llvm_unreachable_internal("Unsupported: Getting the described template declaration" " for bad deduction diagnosis", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10046); | ||||
10047 | } | ||||
10048 | |||||
10049 | /// Diagnose a failed template-argument deduction. | ||||
10050 | static void DiagnoseBadDeduction(Sema &S, NamedDecl *Found, Decl *Templated, | ||||
10051 | DeductionFailureInfo &DeductionFailure, | ||||
10052 | unsigned NumArgs, | ||||
10053 | bool TakingCandidateAddress) { | ||||
10054 | TemplateParameter Param = DeductionFailure.getTemplateParameter(); | ||||
10055 | NamedDecl *ParamD; | ||||
10056 | (ParamD = Param.dyn_cast<TemplateTypeParmDecl*>()) || | ||||
10057 | (ParamD = Param.dyn_cast<NonTypeTemplateParmDecl*>()) || | ||||
10058 | (ParamD = Param.dyn_cast<TemplateTemplateParmDecl*>()); | ||||
10059 | switch (DeductionFailure.Result) { | ||||
10060 | case Sema::TDK_Success: | ||||
10061 | llvm_unreachable("TDK_success while diagnosing bad deduction")::llvm::llvm_unreachable_internal("TDK_success while diagnosing bad deduction" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10061); | ||||
10062 | |||||
10063 | case Sema::TDK_Incomplete: { | ||||
10064 | assert(ParamD && "no parameter found for incomplete deduction result")((ParamD && "no parameter found for incomplete deduction result" ) ? static_cast<void> (0) : __assert_fail ("ParamD && \"no parameter found for incomplete deduction result\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10064, __PRETTY_FUNCTION__)); | ||||
10065 | S.Diag(Templated->getLocation(), | ||||
10066 | diag::note_ovl_candidate_incomplete_deduction) | ||||
10067 | << ParamD->getDeclName(); | ||||
10068 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10069 | return; | ||||
10070 | } | ||||
10071 | |||||
10072 | case Sema::TDK_IncompletePack: { | ||||
10073 | assert(ParamD && "no parameter found for incomplete deduction result")((ParamD && "no parameter found for incomplete deduction result" ) ? static_cast<void> (0) : __assert_fail ("ParamD && \"no parameter found for incomplete deduction result\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10073, __PRETTY_FUNCTION__)); | ||||
10074 | S.Diag(Templated->getLocation(), | ||||
10075 | diag::note_ovl_candidate_incomplete_deduction_pack) | ||||
10076 | << ParamD->getDeclName() | ||||
10077 | << (DeductionFailure.getFirstArg()->pack_size() + 1) | ||||
10078 | << *DeductionFailure.getFirstArg(); | ||||
10079 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10080 | return; | ||||
10081 | } | ||||
10082 | |||||
10083 | case Sema::TDK_Underqualified: { | ||||
10084 | assert(ParamD && "no parameter found for bad qualifiers deduction result")((ParamD && "no parameter found for bad qualifiers deduction result" ) ? static_cast<void> (0) : __assert_fail ("ParamD && \"no parameter found for bad qualifiers deduction result\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10084, __PRETTY_FUNCTION__)); | ||||
10085 | TemplateTypeParmDecl *TParam = cast<TemplateTypeParmDecl>(ParamD); | ||||
10086 | |||||
10087 | QualType Param = DeductionFailure.getFirstArg()->getAsType(); | ||||
10088 | |||||
10089 | // Param will have been canonicalized, but it should just be a | ||||
10090 | // qualified version of ParamD, so move the qualifiers to that. | ||||
10091 | QualifierCollector Qs; | ||||
10092 | Qs.strip(Param); | ||||
10093 | QualType NonCanonParam = Qs.apply(S.Context, TParam->getTypeForDecl()); | ||||
10094 | assert(S.Context.hasSameType(Param, NonCanonParam))((S.Context.hasSameType(Param, NonCanonParam)) ? static_cast< void> (0) : __assert_fail ("S.Context.hasSameType(Param, NonCanonParam)" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10094, __PRETTY_FUNCTION__)); | ||||
10095 | |||||
10096 | // Arg has also been canonicalized, but there's nothing we can do | ||||
10097 | // about that. It also doesn't matter as much, because it won't | ||||
10098 | // have any template parameters in it (because deduction isn't | ||||
10099 | // done on dependent types). | ||||
10100 | QualType Arg = DeductionFailure.getSecondArg()->getAsType(); | ||||
10101 | |||||
10102 | S.Diag(Templated->getLocation(), diag::note_ovl_candidate_underqualified) | ||||
10103 | << ParamD->getDeclName() << Arg << NonCanonParam; | ||||
10104 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10105 | return; | ||||
10106 | } | ||||
10107 | |||||
10108 | case Sema::TDK_Inconsistent: { | ||||
10109 | assert(ParamD && "no parameter found for inconsistent deduction result")((ParamD && "no parameter found for inconsistent deduction result" ) ? static_cast<void> (0) : __assert_fail ("ParamD && \"no parameter found for inconsistent deduction result\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10109, __PRETTY_FUNCTION__)); | ||||
10110 | int which = 0; | ||||
10111 | if (isa<TemplateTypeParmDecl>(ParamD)) | ||||
10112 | which = 0; | ||||
10113 | else if (isa<NonTypeTemplateParmDecl>(ParamD)) { | ||||
10114 | // Deduction might have failed because we deduced arguments of two | ||||
10115 | // different types for a non-type template parameter. | ||||
10116 | // FIXME: Use a different TDK value for this. | ||||
10117 | QualType T1 = | ||||
10118 | DeductionFailure.getFirstArg()->getNonTypeTemplateArgumentType(); | ||||
10119 | QualType T2 = | ||||
10120 | DeductionFailure.getSecondArg()->getNonTypeTemplateArgumentType(); | ||||
10121 | if (!T1.isNull() && !T2.isNull() && !S.Context.hasSameType(T1, T2)) { | ||||
10122 | S.Diag(Templated->getLocation(), | ||||
10123 | diag::note_ovl_candidate_inconsistent_deduction_types) | ||||
10124 | << ParamD->getDeclName() << *DeductionFailure.getFirstArg() << T1 | ||||
10125 | << *DeductionFailure.getSecondArg() << T2; | ||||
10126 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10127 | return; | ||||
10128 | } | ||||
10129 | |||||
10130 | which = 1; | ||||
10131 | } else { | ||||
10132 | which = 2; | ||||
10133 | } | ||||
10134 | |||||
10135 | S.Diag(Templated->getLocation(), | ||||
10136 | diag::note_ovl_candidate_inconsistent_deduction) | ||||
10137 | << which << ParamD->getDeclName() << *DeductionFailure.getFirstArg() | ||||
10138 | << *DeductionFailure.getSecondArg(); | ||||
10139 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10140 | return; | ||||
10141 | } | ||||
10142 | |||||
10143 | case Sema::TDK_InvalidExplicitArguments: | ||||
10144 | assert(ParamD && "no parameter found for invalid explicit arguments")((ParamD && "no parameter found for invalid explicit arguments" ) ? static_cast<void> (0) : __assert_fail ("ParamD && \"no parameter found for invalid explicit arguments\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10144, __PRETTY_FUNCTION__)); | ||||
10145 | if (ParamD->getDeclName()) | ||||
10146 | S.Diag(Templated->getLocation(), | ||||
10147 | diag::note_ovl_candidate_explicit_arg_mismatch_named) | ||||
10148 | << ParamD->getDeclName(); | ||||
10149 | else { | ||||
10150 | int index = 0; | ||||
10151 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(ParamD)) | ||||
10152 | index = TTP->getIndex(); | ||||
10153 | else if (NonTypeTemplateParmDecl *NTTP | ||||
10154 | = dyn_cast<NonTypeTemplateParmDecl>(ParamD)) | ||||
10155 | index = NTTP->getIndex(); | ||||
10156 | else | ||||
10157 | index = cast<TemplateTemplateParmDecl>(ParamD)->getIndex(); | ||||
10158 | S.Diag(Templated->getLocation(), | ||||
10159 | diag::note_ovl_candidate_explicit_arg_mismatch_unnamed) | ||||
10160 | << (index + 1); | ||||
10161 | } | ||||
10162 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10163 | return; | ||||
10164 | |||||
10165 | case Sema::TDK_TooManyArguments: | ||||
10166 | case Sema::TDK_TooFewArguments: | ||||
10167 | DiagnoseArityMismatch(S, Found, Templated, NumArgs); | ||||
10168 | return; | ||||
10169 | |||||
10170 | case Sema::TDK_InstantiationDepth: | ||||
10171 | S.Diag(Templated->getLocation(), | ||||
10172 | diag::note_ovl_candidate_instantiation_depth); | ||||
10173 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10174 | return; | ||||
10175 | |||||
10176 | case Sema::TDK_SubstitutionFailure: { | ||||
10177 | // Format the template argument list into the argument string. | ||||
10178 | SmallString<128> TemplateArgString; | ||||
10179 | if (TemplateArgumentList *Args = | ||||
10180 | DeductionFailure.getTemplateArgumentList()) { | ||||
10181 | TemplateArgString = " "; | ||||
10182 | TemplateArgString += S.getTemplateArgumentBindingsText( | ||||
10183 | getDescribedTemplate(Templated)->getTemplateParameters(), *Args); | ||||
10184 | } | ||||
10185 | |||||
10186 | // If this candidate was disabled by enable_if, say so. | ||||
10187 | PartialDiagnosticAt *PDiag = DeductionFailure.getSFINAEDiagnostic(); | ||||
10188 | if (PDiag && PDiag->second.getDiagID() == | ||||
10189 | diag::err_typename_nested_not_found_enable_if) { | ||||
10190 | // FIXME: Use the source range of the condition, and the fully-qualified | ||||
10191 | // name of the enable_if template. These are both present in PDiag. | ||||
10192 | S.Diag(PDiag->first, diag::note_ovl_candidate_disabled_by_enable_if) | ||||
10193 | << "'enable_if'" << TemplateArgString; | ||||
10194 | return; | ||||
10195 | } | ||||
10196 | |||||
10197 | // We found a specific requirement that disabled the enable_if. | ||||
10198 | if (PDiag && PDiag->second.getDiagID() == | ||||
10199 | diag::err_typename_nested_not_found_requirement) { | ||||
10200 | S.Diag(Templated->getLocation(), | ||||
10201 | diag::note_ovl_candidate_disabled_by_requirement) | ||||
10202 | << PDiag->second.getStringArg(0) << TemplateArgString; | ||||
10203 | return; | ||||
10204 | } | ||||
10205 | |||||
10206 | // Format the SFINAE diagnostic into the argument string. | ||||
10207 | // FIXME: Add a general mechanism to include a PartialDiagnostic *'s | ||||
10208 | // formatted message in another diagnostic. | ||||
10209 | SmallString<128> SFINAEArgString; | ||||
10210 | SourceRange R; | ||||
10211 | if (PDiag) { | ||||
10212 | SFINAEArgString = ": "; | ||||
10213 | R = SourceRange(PDiag->first, PDiag->first); | ||||
10214 | PDiag->second.EmitToString(S.getDiagnostics(), SFINAEArgString); | ||||
10215 | } | ||||
10216 | |||||
10217 | S.Diag(Templated->getLocation(), | ||||
10218 | diag::note_ovl_candidate_substitution_failure) | ||||
10219 | << TemplateArgString << SFINAEArgString << R; | ||||
10220 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10221 | return; | ||||
10222 | } | ||||
10223 | |||||
10224 | case Sema::TDK_DeducedMismatch: | ||||
10225 | case Sema::TDK_DeducedMismatchNested: { | ||||
10226 | // Format the template argument list into the argument string. | ||||
10227 | SmallString<128> TemplateArgString; | ||||
10228 | if (TemplateArgumentList *Args = | ||||
10229 | DeductionFailure.getTemplateArgumentList()) { | ||||
10230 | TemplateArgString = " "; | ||||
10231 | TemplateArgString += S.getTemplateArgumentBindingsText( | ||||
10232 | getDescribedTemplate(Templated)->getTemplateParameters(), *Args); | ||||
10233 | } | ||||
10234 | |||||
10235 | S.Diag(Templated->getLocation(), diag::note_ovl_candidate_deduced_mismatch) | ||||
10236 | << (*DeductionFailure.getCallArgIndex() + 1) | ||||
10237 | << *DeductionFailure.getFirstArg() << *DeductionFailure.getSecondArg() | ||||
10238 | << TemplateArgString | ||||
10239 | << (DeductionFailure.Result == Sema::TDK_DeducedMismatchNested); | ||||
10240 | break; | ||||
10241 | } | ||||
10242 | |||||
10243 | case Sema::TDK_NonDeducedMismatch: { | ||||
10244 | // FIXME: Provide a source location to indicate what we couldn't match. | ||||
10245 | TemplateArgument FirstTA = *DeductionFailure.getFirstArg(); | ||||
10246 | TemplateArgument SecondTA = *DeductionFailure.getSecondArg(); | ||||
10247 | if (FirstTA.getKind() == TemplateArgument::Template && | ||||
10248 | SecondTA.getKind() == TemplateArgument::Template) { | ||||
10249 | TemplateName FirstTN = FirstTA.getAsTemplate(); | ||||
10250 | TemplateName SecondTN = SecondTA.getAsTemplate(); | ||||
10251 | if (FirstTN.getKind() == TemplateName::Template && | ||||
10252 | SecondTN.getKind() == TemplateName::Template) { | ||||
10253 | if (FirstTN.getAsTemplateDecl()->getName() == | ||||
10254 | SecondTN.getAsTemplateDecl()->getName()) { | ||||
10255 | // FIXME: This fixes a bad diagnostic where both templates are named | ||||
10256 | // the same. This particular case is a bit difficult since: | ||||
10257 | // 1) It is passed as a string to the diagnostic printer. | ||||
10258 | // 2) The diagnostic printer only attempts to find a better | ||||
10259 | // name for types, not decls. | ||||
10260 | // Ideally, this should folded into the diagnostic printer. | ||||
10261 | S.Diag(Templated->getLocation(), | ||||
10262 | diag::note_ovl_candidate_non_deduced_mismatch_qualified) | ||||
10263 | << FirstTN.getAsTemplateDecl() << SecondTN.getAsTemplateDecl(); | ||||
10264 | return; | ||||
10265 | } | ||||
10266 | } | ||||
10267 | } | ||||
10268 | |||||
10269 | if (TakingCandidateAddress && isa<FunctionDecl>(Templated) && | ||||
10270 | !checkAddressOfCandidateIsAvailable(S, cast<FunctionDecl>(Templated))) | ||||
10271 | return; | ||||
10272 | |||||
10273 | // FIXME: For generic lambda parameters, check if the function is a lambda | ||||
10274 | // call operator, and if so, emit a prettier and more informative | ||||
10275 | // diagnostic that mentions 'auto' and lambda in addition to | ||||
10276 | // (or instead of?) the canonical template type parameters. | ||||
10277 | S.Diag(Templated->getLocation(), | ||||
10278 | diag::note_ovl_candidate_non_deduced_mismatch) | ||||
10279 | << FirstTA << SecondTA; | ||||
10280 | return; | ||||
10281 | } | ||||
10282 | // TODO: diagnose these individually, then kill off | ||||
10283 | // note_ovl_candidate_bad_deduction, which is uselessly vague. | ||||
10284 | case Sema::TDK_MiscellaneousDeductionFailure: | ||||
10285 | S.Diag(Templated->getLocation(), diag::note_ovl_candidate_bad_deduction); | ||||
10286 | MaybeEmitInheritedConstructorNote(S, Found); | ||||
10287 | return; | ||||
10288 | case Sema::TDK_CUDATargetMismatch: | ||||
10289 | S.Diag(Templated->getLocation(), | ||||
10290 | diag::note_cuda_ovl_candidate_target_mismatch); | ||||
10291 | return; | ||||
10292 | } | ||||
10293 | } | ||||
10294 | |||||
10295 | /// Diagnose a failed template-argument deduction, for function calls. | ||||
10296 | static void DiagnoseBadDeduction(Sema &S, OverloadCandidate *Cand, | ||||
10297 | unsigned NumArgs, | ||||
10298 | bool TakingCandidateAddress) { | ||||
10299 | unsigned TDK = Cand->DeductionFailure.Result; | ||||
10300 | if (TDK == Sema::TDK_TooFewArguments || TDK == Sema::TDK_TooManyArguments) { | ||||
10301 | if (CheckArityMismatch(S, Cand, NumArgs)) | ||||
10302 | return; | ||||
10303 | } | ||||
10304 | DiagnoseBadDeduction(S, Cand->FoundDecl, Cand->Function, // pattern | ||||
10305 | Cand->DeductionFailure, NumArgs, TakingCandidateAddress); | ||||
10306 | } | ||||
10307 | |||||
10308 | /// CUDA: diagnose an invalid call across targets. | ||||
10309 | static void DiagnoseBadTarget(Sema &S, OverloadCandidate *Cand) { | ||||
10310 | FunctionDecl *Caller = cast<FunctionDecl>(S.CurContext); | ||||
10311 | FunctionDecl *Callee = Cand->Function; | ||||
10312 | |||||
10313 | Sema::CUDAFunctionTarget CallerTarget = S.IdentifyCUDATarget(Caller), | ||||
10314 | CalleeTarget = S.IdentifyCUDATarget(Callee); | ||||
10315 | |||||
10316 | std::string FnDesc; | ||||
10317 | std::pair<OverloadCandidateKind, OverloadCandidateSelect> FnKindPair = | ||||
10318 | ClassifyOverloadCandidate(S, Cand->FoundDecl, Callee, FnDesc); | ||||
10319 | |||||
10320 | S.Diag(Callee->getLocation(), diag::note_ovl_candidate_bad_target) | ||||
10321 | << (unsigned)FnKindPair.first << (unsigned)ocs_non_template | ||||
10322 | << FnDesc /* Ignored */ | ||||
10323 | << CalleeTarget << CallerTarget; | ||||
10324 | |||||
10325 | // This could be an implicit constructor for which we could not infer the | ||||
10326 | // target due to a collsion. Diagnose that case. | ||||
10327 | CXXMethodDecl *Meth = dyn_cast<CXXMethodDecl>(Callee); | ||||
10328 | if (Meth != nullptr && Meth->isImplicit()) { | ||||
10329 | CXXRecordDecl *ParentClass = Meth->getParent(); | ||||
10330 | Sema::CXXSpecialMember CSM; | ||||
10331 | |||||
10332 | switch (FnKindPair.first) { | ||||
10333 | default: | ||||
10334 | return; | ||||
10335 | case oc_implicit_default_constructor: | ||||
10336 | CSM = Sema::CXXDefaultConstructor; | ||||
10337 | break; | ||||
10338 | case oc_implicit_copy_constructor: | ||||
10339 | CSM = Sema::CXXCopyConstructor; | ||||
10340 | break; | ||||
10341 | case oc_implicit_move_constructor: | ||||
10342 | CSM = Sema::CXXMoveConstructor; | ||||
10343 | break; | ||||
10344 | case oc_implicit_copy_assignment: | ||||
10345 | CSM = Sema::CXXCopyAssignment; | ||||
10346 | break; | ||||
10347 | case oc_implicit_move_assignment: | ||||
10348 | CSM = Sema::CXXMoveAssignment; | ||||
10349 | break; | ||||
10350 | }; | ||||
10351 | |||||
10352 | bool ConstRHS = false; | ||||
10353 | if (Meth->getNumParams()) { | ||||
10354 | if (const ReferenceType *RT = | ||||
10355 | Meth->getParamDecl(0)->getType()->getAs<ReferenceType>()) { | ||||
10356 | ConstRHS = RT->getPointeeType().isConstQualified(); | ||||
10357 | } | ||||
10358 | } | ||||
10359 | |||||
10360 | S.inferCUDATargetForImplicitSpecialMember(ParentClass, CSM, Meth, | ||||
10361 | /* ConstRHS */ ConstRHS, | ||||
10362 | /* Diagnose */ true); | ||||
10363 | } | ||||
10364 | } | ||||
10365 | |||||
10366 | static void DiagnoseFailedEnableIfAttr(Sema &S, OverloadCandidate *Cand) { | ||||
10367 | FunctionDecl *Callee = Cand->Function; | ||||
10368 | EnableIfAttr *Attr = static_cast<EnableIfAttr*>(Cand->DeductionFailure.Data); | ||||
10369 | |||||
10370 | S.Diag(Callee->getLocation(), | ||||
10371 | diag::note_ovl_candidate_disabled_by_function_cond_attr) | ||||
10372 | << Attr->getCond()->getSourceRange() << Attr->getMessage(); | ||||
10373 | } | ||||
10374 | |||||
10375 | static void DiagnoseFailedExplicitSpec(Sema &S, OverloadCandidate *Cand) { | ||||
10376 | ExplicitSpecifier ES; | ||||
10377 | const char *DeclName; | ||||
10378 | switch (Cand->Function->getDeclKind()) { | ||||
10379 | case Decl::Kind::CXXConstructor: | ||||
10380 | ES = cast<CXXConstructorDecl>(Cand->Function)->getExplicitSpecifier(); | ||||
10381 | DeclName = "constructor"; | ||||
10382 | break; | ||||
10383 | case Decl::Kind::CXXConversion: | ||||
10384 | ES = cast<CXXConversionDecl>(Cand->Function)->getExplicitSpecifier(); | ||||
10385 | DeclName = "conversion operator"; | ||||
10386 | break; | ||||
10387 | case Decl::Kind::CXXDeductionGuide: | ||||
10388 | ES = cast<CXXDeductionGuideDecl>(Cand->Function)->getExplicitSpecifier(); | ||||
10389 | DeclName = "deductiong guide"; | ||||
10390 | break; | ||||
10391 | default: | ||||
10392 | llvm_unreachable("invalid Decl")::llvm::llvm_unreachable_internal("invalid Decl", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10392); | ||||
10393 | } | ||||
10394 | assert(ES.getExpr() && "null expression should be handled before")((ES.getExpr() && "null expression should be handled before" ) ? static_cast<void> (0) : __assert_fail ("ES.getExpr() && \"null expression should be handled before\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10394, __PRETTY_FUNCTION__)); | ||||
10395 | S.Diag(Cand->Function->getLocation(), | ||||
10396 | diag::note_ovl_candidate_explicit_forbidden) | ||||
10397 | << DeclName; | ||||
10398 | S.Diag(ES.getExpr()->getBeginLoc(), | ||||
10399 | diag::note_explicit_bool_resolved_to_true); | ||||
10400 | } | ||||
10401 | |||||
10402 | static void DiagnoseOpenCLExtensionDisabled(Sema &S, OverloadCandidate *Cand) { | ||||
10403 | FunctionDecl *Callee = Cand->Function; | ||||
10404 | |||||
10405 | S.Diag(Callee->getLocation(), | ||||
10406 | diag::note_ovl_candidate_disabled_by_extension) | ||||
10407 | << S.getOpenCLExtensionsFromDeclExtMap(Callee); | ||||
10408 | } | ||||
10409 | |||||
10410 | /// Generates a 'note' diagnostic for an overload candidate. We've | ||||
10411 | /// already generated a primary error at the call site. | ||||
10412 | /// | ||||
10413 | /// It really does need to be a single diagnostic with its caret | ||||
10414 | /// pointed at the candidate declaration. Yes, this creates some | ||||
10415 | /// major challenges of technical writing. Yes, this makes pointing | ||||
10416 | /// out problems with specific arguments quite awkward. It's still | ||||
10417 | /// better than generating twenty screens of text for every failed | ||||
10418 | /// overload. | ||||
10419 | /// | ||||
10420 | /// It would be great to be able to express per-candidate problems | ||||
10421 | /// more richly for those diagnostic clients that cared, but we'd | ||||
10422 | /// still have to be just as careful with the default diagnostics. | ||||
10423 | /// \param CtorDestAS Addr space of object being constructed (for ctor | ||||
10424 | /// candidates only). | ||||
10425 | static void NoteFunctionCandidate(Sema &S, OverloadCandidate *Cand, | ||||
10426 | unsigned NumArgs, | ||||
10427 | bool TakingCandidateAddress, | ||||
10428 | LangAS CtorDestAS = LangAS::Default) { | ||||
10429 | FunctionDecl *Fn = Cand->Function; | ||||
10430 | |||||
10431 | // Note deleted candidates, but only if they're viable. | ||||
10432 | if (Cand->Viable) { | ||||
10433 | if (Fn->isDeleted()) { | ||||
10434 | std::string FnDesc; | ||||
10435 | std::pair<OverloadCandidateKind, OverloadCandidateSelect> FnKindPair = | ||||
10436 | ClassifyOverloadCandidate(S, Cand->FoundDecl, Fn, FnDesc); | ||||
10437 | |||||
10438 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_deleted) | ||||
10439 | << (unsigned)FnKindPair.first << (unsigned)FnKindPair.second << FnDesc | ||||
10440 | << (Fn->isDeleted() ? (Fn->isDeletedAsWritten() ? 1 : 2) : 0); | ||||
10441 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
10442 | return; | ||||
10443 | } | ||||
10444 | |||||
10445 | // We don't really have anything else to say about viable candidates. | ||||
10446 | S.NoteOverloadCandidate(Cand->FoundDecl, Fn); | ||||
10447 | return; | ||||
10448 | } | ||||
10449 | |||||
10450 | switch (Cand->FailureKind) { | ||||
10451 | case ovl_fail_too_many_arguments: | ||||
10452 | case ovl_fail_too_few_arguments: | ||||
10453 | return DiagnoseArityMismatch(S, Cand, NumArgs); | ||||
10454 | |||||
10455 | case ovl_fail_bad_deduction: | ||||
10456 | return DiagnoseBadDeduction(S, Cand, NumArgs, | ||||
10457 | TakingCandidateAddress); | ||||
10458 | |||||
10459 | case ovl_fail_illegal_constructor: { | ||||
10460 | S.Diag(Fn->getLocation(), diag::note_ovl_candidate_illegal_constructor) | ||||
10461 | << (Fn->getPrimaryTemplate() ? 1 : 0); | ||||
10462 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
10463 | return; | ||||
10464 | } | ||||
10465 | |||||
10466 | case ovl_fail_object_addrspace_mismatch: { | ||||
10467 | Qualifiers QualsForPrinting; | ||||
10468 | QualsForPrinting.setAddressSpace(CtorDestAS); | ||||
10469 | S.Diag(Fn->getLocation(), | ||||
10470 | diag::note_ovl_candidate_illegal_constructor_adrspace_mismatch) | ||||
10471 | << QualsForPrinting; | ||||
10472 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
10473 | return; | ||||
10474 | } | ||||
10475 | |||||
10476 | case ovl_fail_trivial_conversion: | ||||
10477 | case ovl_fail_bad_final_conversion: | ||||
10478 | case ovl_fail_final_conversion_not_exact: | ||||
10479 | return S.NoteOverloadCandidate(Cand->FoundDecl, Fn); | ||||
10480 | |||||
10481 | case ovl_fail_bad_conversion: { | ||||
10482 | unsigned I = (Cand->IgnoreObjectArgument ? 1 : 0); | ||||
10483 | for (unsigned N = Cand->Conversions.size(); I != N; ++I) | ||||
10484 | if (Cand->Conversions[I].isBad()) | ||||
10485 | return DiagnoseBadConversion(S, Cand, I, TakingCandidateAddress); | ||||
10486 | |||||
10487 | // FIXME: this currently happens when we're called from SemaInit | ||||
10488 | // when user-conversion overload fails. Figure out how to handle | ||||
10489 | // those conditions and diagnose them well. | ||||
10490 | return S.NoteOverloadCandidate(Cand->FoundDecl, Fn); | ||||
10491 | } | ||||
10492 | |||||
10493 | case ovl_fail_bad_target: | ||||
10494 | return DiagnoseBadTarget(S, Cand); | ||||
10495 | |||||
10496 | case ovl_fail_enable_if: | ||||
10497 | return DiagnoseFailedEnableIfAttr(S, Cand); | ||||
10498 | |||||
10499 | case ovl_fail_explicit_resolved: | ||||
10500 | return DiagnoseFailedExplicitSpec(S, Cand); | ||||
10501 | |||||
10502 | case ovl_fail_ext_disabled: | ||||
10503 | return DiagnoseOpenCLExtensionDisabled(S, Cand); | ||||
10504 | |||||
10505 | case ovl_fail_inhctor_slice: | ||||
10506 | // It's generally not interesting to note copy/move constructors here. | ||||
10507 | if (cast<CXXConstructorDecl>(Fn)->isCopyOrMoveConstructor()) | ||||
10508 | return; | ||||
10509 | S.Diag(Fn->getLocation(), | ||||
10510 | diag::note_ovl_candidate_inherited_constructor_slice) | ||||
10511 | << (Fn->getPrimaryTemplate() ? 1 : 0) | ||||
10512 | << Fn->getParamDecl(0)->getType()->isRValueReferenceType(); | ||||
10513 | MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl); | ||||
10514 | return; | ||||
10515 | |||||
10516 | case ovl_fail_addr_not_available: { | ||||
10517 | bool Available = checkAddressOfCandidateIsAvailable(S, Cand->Function); | ||||
10518 | (void)Available; | ||||
10519 | assert(!Available)((!Available) ? static_cast<void> (0) : __assert_fail ( "!Available", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10519, __PRETTY_FUNCTION__)); | ||||
10520 | break; | ||||
10521 | } | ||||
10522 | case ovl_non_default_multiversion_function: | ||||
10523 | // Do nothing, these should simply be ignored. | ||||
10524 | break; | ||||
10525 | } | ||||
10526 | } | ||||
10527 | |||||
10528 | static void NoteSurrogateCandidate(Sema &S, OverloadCandidate *Cand) { | ||||
10529 | // Desugar the type of the surrogate down to a function type, | ||||
10530 | // retaining as many typedefs as possible while still showing | ||||
10531 | // the function type (and, therefore, its parameter types). | ||||
10532 | QualType FnType = Cand->Surrogate->getConversionType(); | ||||
10533 | bool isLValueReference = false; | ||||
10534 | bool isRValueReference = false; | ||||
10535 | bool isPointer = false; | ||||
10536 | if (const LValueReferenceType *FnTypeRef = | ||||
10537 | FnType->getAs<LValueReferenceType>()) { | ||||
10538 | FnType = FnTypeRef->getPointeeType(); | ||||
10539 | isLValueReference = true; | ||||
10540 | } else if (const RValueReferenceType *FnTypeRef = | ||||
10541 | FnType->getAs<RValueReferenceType>()) { | ||||
10542 | FnType = FnTypeRef->getPointeeType(); | ||||
10543 | isRValueReference = true; | ||||
10544 | } | ||||
10545 | if (const PointerType *FnTypePtr = FnType->getAs<PointerType>()) { | ||||
10546 | FnType = FnTypePtr->getPointeeType(); | ||||
10547 | isPointer = true; | ||||
10548 | } | ||||
10549 | // Desugar down to a function type. | ||||
10550 | FnType = QualType(FnType->getAs<FunctionType>(), 0); | ||||
10551 | // Reconstruct the pointer/reference as appropriate. | ||||
10552 | if (isPointer) FnType = S.Context.getPointerType(FnType); | ||||
10553 | if (isRValueReference) FnType = S.Context.getRValueReferenceType(FnType); | ||||
10554 | if (isLValueReference) FnType = S.Context.getLValueReferenceType(FnType); | ||||
10555 | |||||
10556 | S.Diag(Cand->Surrogate->getLocation(), diag::note_ovl_surrogate_cand) | ||||
10557 | << FnType; | ||||
10558 | } | ||||
10559 | |||||
10560 | static void NoteBuiltinOperatorCandidate(Sema &S, StringRef Opc, | ||||
10561 | SourceLocation OpLoc, | ||||
10562 | OverloadCandidate *Cand) { | ||||
10563 | assert(Cand->Conversions.size() <= 2 && "builtin operator is not binary")((Cand->Conversions.size() <= 2 && "builtin operator is not binary" ) ? static_cast<void> (0) : __assert_fail ("Cand->Conversions.size() <= 2 && \"builtin operator is not binary\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10563, __PRETTY_FUNCTION__)); | ||||
10564 | std::string TypeStr("operator"); | ||||
10565 | TypeStr += Opc; | ||||
10566 | TypeStr += "("; | ||||
10567 | TypeStr += Cand->BuiltinParamTypes[0].getAsString(); | ||||
10568 | if (Cand->Conversions.size() == 1) { | ||||
10569 | TypeStr += ")"; | ||||
10570 | S.Diag(OpLoc, diag::note_ovl_builtin_candidate) << TypeStr; | ||||
10571 | } else { | ||||
10572 | TypeStr += ", "; | ||||
10573 | TypeStr += Cand->BuiltinParamTypes[1].getAsString(); | ||||
10574 | TypeStr += ")"; | ||||
10575 | S.Diag(OpLoc, diag::note_ovl_builtin_candidate) << TypeStr; | ||||
10576 | } | ||||
10577 | } | ||||
10578 | |||||
10579 | static void NoteAmbiguousUserConversions(Sema &S, SourceLocation OpLoc, | ||||
10580 | OverloadCandidate *Cand) { | ||||
10581 | for (const ImplicitConversionSequence &ICS : Cand->Conversions) { | ||||
10582 | if (ICS.isBad()) break; // all meaningless after first invalid | ||||
10583 | if (!ICS.isAmbiguous()) continue; | ||||
10584 | |||||
10585 | ICS.DiagnoseAmbiguousConversion( | ||||
10586 | S, OpLoc, S.PDiag(diag::note_ambiguous_type_conversion)); | ||||
10587 | } | ||||
10588 | } | ||||
10589 | |||||
10590 | static SourceLocation GetLocationForCandidate(const OverloadCandidate *Cand) { | ||||
10591 | if (Cand->Function) | ||||
10592 | return Cand->Function->getLocation(); | ||||
10593 | if (Cand->IsSurrogate) | ||||
10594 | return Cand->Surrogate->getLocation(); | ||||
10595 | return SourceLocation(); | ||||
10596 | } | ||||
10597 | |||||
10598 | static unsigned RankDeductionFailure(const DeductionFailureInfo &DFI) { | ||||
10599 | switch ((Sema::TemplateDeductionResult)DFI.Result) { | ||||
10600 | case Sema::TDK_Success: | ||||
10601 | case Sema::TDK_NonDependentConversionFailure: | ||||
10602 | llvm_unreachable("non-deduction failure while diagnosing bad deduction")::llvm::llvm_unreachable_internal("non-deduction failure while diagnosing bad deduction" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10602); | ||||
10603 | |||||
10604 | case Sema::TDK_Invalid: | ||||
10605 | case Sema::TDK_Incomplete: | ||||
10606 | case Sema::TDK_IncompletePack: | ||||
10607 | return 1; | ||||
10608 | |||||
10609 | case Sema::TDK_Underqualified: | ||||
10610 | case Sema::TDK_Inconsistent: | ||||
10611 | return 2; | ||||
10612 | |||||
10613 | case Sema::TDK_SubstitutionFailure: | ||||
10614 | case Sema::TDK_DeducedMismatch: | ||||
10615 | case Sema::TDK_DeducedMismatchNested: | ||||
10616 | case Sema::TDK_NonDeducedMismatch: | ||||
10617 | case Sema::TDK_MiscellaneousDeductionFailure: | ||||
10618 | case Sema::TDK_CUDATargetMismatch: | ||||
10619 | return 3; | ||||
10620 | |||||
10621 | case Sema::TDK_InstantiationDepth: | ||||
10622 | return 4; | ||||
10623 | |||||
10624 | case Sema::TDK_InvalidExplicitArguments: | ||||
10625 | return 5; | ||||
10626 | |||||
10627 | case Sema::TDK_TooManyArguments: | ||||
10628 | case Sema::TDK_TooFewArguments: | ||||
10629 | return 6; | ||||
10630 | } | ||||
10631 | llvm_unreachable("Unhandled deduction result")::llvm::llvm_unreachable_internal("Unhandled deduction result" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10631); | ||||
10632 | } | ||||
10633 | |||||
10634 | namespace { | ||||
10635 | struct CompareOverloadCandidatesForDisplay { | ||||
10636 | Sema &S; | ||||
10637 | SourceLocation Loc; | ||||
10638 | size_t NumArgs; | ||||
10639 | OverloadCandidateSet::CandidateSetKind CSK; | ||||
10640 | |||||
10641 | CompareOverloadCandidatesForDisplay( | ||||
10642 | Sema &S, SourceLocation Loc, size_t NArgs, | ||||
10643 | OverloadCandidateSet::CandidateSetKind CSK) | ||||
10644 | : S(S), NumArgs(NArgs), CSK(CSK) {} | ||||
10645 | |||||
10646 | bool operator()(const OverloadCandidate *L, | ||||
10647 | const OverloadCandidate *R) { | ||||
10648 | // Fast-path this check. | ||||
10649 | if (L == R) return false; | ||||
| |||||
10650 | |||||
10651 | // Order first by viability. | ||||
10652 | if (L->Viable) { | ||||
10653 | if (!R->Viable) return true; | ||||
10654 | |||||
10655 | // TODO: introduce a tri-valued comparison for overload | ||||
10656 | // candidates. Would be more worthwhile if we had a sort | ||||
10657 | // that could exploit it. | ||||
10658 | if (isBetterOverloadCandidate(S, *L, *R, SourceLocation(), CSK)) | ||||
10659 | return true; | ||||
10660 | if (isBetterOverloadCandidate(S, *R, *L, SourceLocation(), CSK)) | ||||
10661 | return false; | ||||
10662 | } else if (R->Viable) | ||||
10663 | return false; | ||||
10664 | |||||
10665 | assert
: __assert_fail ("L->Viable == R->Viable", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10665, __PRETTY_FUNCTION__)); | ||||
10666 | |||||
10667 | // Criteria by which we can sort non-viable candidates: | ||||
10668 | if (!L->Viable
| ||||
10669 | // 1. Arity mismatches come after other candidates. | ||||
10670 | if (L->FailureKind == ovl_fail_too_many_arguments || | ||||
10671 | L->FailureKind == ovl_fail_too_few_arguments) { | ||||
10672 | if (R->FailureKind == ovl_fail_too_many_arguments || | ||||
10673 | R->FailureKind == ovl_fail_too_few_arguments) { | ||||
10674 | int LDist = std::abs((int)L->getNumParams() - (int)NumArgs); | ||||
10675 | int RDist = std::abs((int)R->getNumParams() - (int)NumArgs); | ||||
10676 | if (LDist == RDist) { | ||||
10677 | if (L->FailureKind == R->FailureKind) | ||||
10678 | // Sort non-surrogates before surrogates. | ||||
10679 | return !L->IsSurrogate && R->IsSurrogate; | ||||
10680 | // Sort candidates requiring fewer parameters than there were | ||||
10681 | // arguments given after candidates requiring more parameters | ||||
10682 | // than there were arguments given. | ||||
10683 | return L->FailureKind == ovl_fail_too_many_arguments; | ||||
10684 | } | ||||
10685 | return LDist < RDist; | ||||
10686 | } | ||||
10687 | return false; | ||||
10688 | } | ||||
10689 | if (R->FailureKind == ovl_fail_too_many_arguments || | ||||
10690 | R->FailureKind == ovl_fail_too_few_arguments) | ||||
10691 | return true; | ||||
10692 | |||||
10693 | // 2. Bad conversions come first and are ordered by the number | ||||
10694 | // of bad conversions and quality of good conversions. | ||||
10695 | if (L->FailureKind == ovl_fail_bad_conversion) { | ||||
10696 | if (R->FailureKind != ovl_fail_bad_conversion) | ||||
10697 | return true; | ||||
10698 | |||||
10699 | // The conversion that can be fixed with a smaller number of changes, | ||||
10700 | // comes first. | ||||
10701 | unsigned numLFixes = L->Fix.NumConversionsFixed; | ||||
10702 | unsigned numRFixes = R->Fix.NumConversionsFixed; | ||||
10703 | numLFixes = (numLFixes == 0) ? UINT_MAX(2147483647 *2U +1U) : numLFixes; | ||||
10704 | numRFixes = (numRFixes == 0) ? UINT_MAX(2147483647 *2U +1U) : numRFixes; | ||||
10705 | if (numLFixes != numRFixes) { | ||||
10706 | return numLFixes < numRFixes; | ||||
10707 | } | ||||
10708 | |||||
10709 | // If there's any ordering between the defined conversions... | ||||
10710 | // FIXME: this might not be transitive. | ||||
10711 | assert(L->Conversions.size() == R->Conversions.size())((L->Conversions.size() == R->Conversions.size()) ? static_cast <void> (0) : __assert_fail ("L->Conversions.size() == R->Conversions.size()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10711, __PRETTY_FUNCTION__)); | ||||
10712 | |||||
10713 | int leftBetter = 0; | ||||
10714 | unsigned I = (L->IgnoreObjectArgument || R->IgnoreObjectArgument); | ||||
10715 | for (unsigned E = L->Conversions.size(); I != E; ++I) { | ||||
10716 | switch (CompareImplicitConversionSequences(S, Loc, | ||||
10717 | L->Conversions[I], | ||||
10718 | R->Conversions[I])) { | ||||
10719 | case ImplicitConversionSequence::Better: | ||||
10720 | leftBetter++; | ||||
10721 | break; | ||||
10722 | |||||
10723 | case ImplicitConversionSequence::Worse: | ||||
10724 | leftBetter--; | ||||
10725 | break; | ||||
10726 | |||||
10727 | case ImplicitConversionSequence::Indistinguishable: | ||||
10728 | break; | ||||
10729 | } | ||||
10730 | } | ||||
10731 | if (leftBetter > 0) return true; | ||||
10732 | if (leftBetter < 0) return false; | ||||
10733 | |||||
10734 | } else if (R->FailureKind == ovl_fail_bad_conversion) | ||||
10735 | return false; | ||||
10736 | |||||
10737 | if (L->FailureKind == ovl_fail_bad_deduction) { | ||||
10738 | if (R->FailureKind != ovl_fail_bad_deduction) | ||||
10739 | return true; | ||||
10740 | |||||
10741 | if (L->DeductionFailure.Result != R->DeductionFailure.Result) | ||||
10742 | return RankDeductionFailure(L->DeductionFailure) | ||||
10743 | < RankDeductionFailure(R->DeductionFailure); | ||||
10744 | } else if (R->FailureKind == ovl_fail_bad_deduction) | ||||
10745 | return false; | ||||
10746 | |||||
10747 | // TODO: others? | ||||
10748 | } | ||||
10749 | |||||
10750 | // Sort everything else by location. | ||||
10751 | SourceLocation LLoc = GetLocationForCandidate(L); | ||||
10752 | SourceLocation RLoc = GetLocationForCandidate(R); | ||||
10753 | |||||
10754 | // Put candidates without locations (e.g. builtins) at the end. | ||||
10755 | if (LLoc.isInvalid()) return false; | ||||
10756 | if (RLoc.isInvalid()) return true; | ||||
10757 | |||||
10758 | return S.SourceMgr.isBeforeInTranslationUnit(LLoc, RLoc); | ||||
10759 | } | ||||
10760 | }; | ||||
10761 | } | ||||
10762 | |||||
10763 | /// CompleteNonViableCandidate - Normally, overload resolution only | ||||
10764 | /// computes up to the first bad conversion. Produces the FixIt set if | ||||
10765 | /// possible. | ||||
10766 | static void CompleteNonViableCandidate(Sema &S, OverloadCandidate *Cand, | ||||
10767 | ArrayRef<Expr *> Args) { | ||||
10768 | assert(!Cand->Viable)((!Cand->Viable) ? static_cast<void> (0) : __assert_fail ("!Cand->Viable", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10768, __PRETTY_FUNCTION__)); | ||||
10769 | |||||
10770 | // Don't do anything on failures other than bad conversion. | ||||
10771 | if (Cand->FailureKind != ovl_fail_bad_conversion) return; | ||||
10772 | |||||
10773 | // We only want the FixIts if all the arguments can be corrected. | ||||
10774 | bool Unfixable = false; | ||||
10775 | // Use a implicit copy initialization to check conversion fixes. | ||||
10776 | Cand->Fix.setConversionChecker(TryCopyInitialization); | ||||
10777 | |||||
10778 | // Attempt to fix the bad conversion. | ||||
10779 | unsigned ConvCount = Cand->Conversions.size(); | ||||
10780 | for (unsigned ConvIdx = (Cand->IgnoreObjectArgument ? 1 : 0); /**/; | ||||
10781 | ++ConvIdx) { | ||||
10782 | assert(ConvIdx != ConvCount && "no bad conversion in candidate")((ConvIdx != ConvCount && "no bad conversion in candidate" ) ? static_cast<void> (0) : __assert_fail ("ConvIdx != ConvCount && \"no bad conversion in candidate\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10782, __PRETTY_FUNCTION__)); | ||||
10783 | if (Cand->Conversions[ConvIdx].isInitialized() && | ||||
10784 | Cand->Conversions[ConvIdx].isBad()) { | ||||
10785 | Unfixable = !Cand->TryToFixBadConversion(ConvIdx, S); | ||||
10786 | break; | ||||
10787 | } | ||||
10788 | } | ||||
10789 | |||||
10790 | // FIXME: this should probably be preserved from the overload | ||||
10791 | // operation somehow. | ||||
10792 | bool SuppressUserConversions = false; | ||||
10793 | |||||
10794 | unsigned ConvIdx = 0; | ||||
10795 | ArrayRef<QualType> ParamTypes; | ||||
10796 | |||||
10797 | if (Cand->IsSurrogate) { | ||||
10798 | QualType ConvType | ||||
10799 | = Cand->Surrogate->getConversionType().getNonReferenceType(); | ||||
10800 | if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>()) | ||||
10801 | ConvType = ConvPtrType->getPointeeType(); | ||||
10802 | ParamTypes = ConvType->castAs<FunctionProtoType>()->getParamTypes(); | ||||
10803 | // Conversion 0 is 'this', which doesn't have a corresponding argument. | ||||
10804 | ConvIdx = 1; | ||||
10805 | } else if (Cand->Function) { | ||||
10806 | ParamTypes = | ||||
10807 | Cand->Function->getType()->castAs<FunctionProtoType>()->getParamTypes(); | ||||
10808 | if (isa<CXXMethodDecl>(Cand->Function) && | ||||
10809 | !isa<CXXConstructorDecl>(Cand->Function)) { | ||||
10810 | // Conversion 0 is 'this', which doesn't have a corresponding argument. | ||||
10811 | ConvIdx = 1; | ||||
10812 | } | ||||
10813 | } else { | ||||
10814 | // Builtin operator. | ||||
10815 | assert(ConvCount <= 3)((ConvCount <= 3) ? static_cast<void> (0) : __assert_fail ("ConvCount <= 3", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10815, __PRETTY_FUNCTION__)); | ||||
10816 | ParamTypes = Cand->BuiltinParamTypes; | ||||
10817 | } | ||||
10818 | |||||
10819 | // Fill in the rest of the conversions. | ||||
10820 | for (unsigned ArgIdx = 0; ConvIdx != ConvCount; ++ConvIdx, ++ArgIdx) { | ||||
10821 | if (Cand->Conversions[ConvIdx].isInitialized()) { | ||||
10822 | // We've already checked this conversion. | ||||
10823 | } else if (ArgIdx < ParamTypes.size()) { | ||||
10824 | if (ParamTypes[ArgIdx]->isDependentType()) | ||||
10825 | Cand->Conversions[ConvIdx].setAsIdentityConversion( | ||||
10826 | Args[ArgIdx]->getType()); | ||||
10827 | else { | ||||
10828 | Cand->Conversions[ConvIdx] = | ||||
10829 | TryCopyInitialization(S, Args[ArgIdx], ParamTypes[ArgIdx], | ||||
10830 | SuppressUserConversions, | ||||
10831 | /*InOverloadResolution=*/true, | ||||
10832 | /*AllowObjCWritebackConversion=*/ | ||||
10833 | S.getLangOpts().ObjCAutoRefCount); | ||||
10834 | // Store the FixIt in the candidate if it exists. | ||||
10835 | if (!Unfixable && Cand->Conversions[ConvIdx].isBad()) | ||||
10836 | Unfixable = !Cand->TryToFixBadConversion(ConvIdx, S); | ||||
10837 | } | ||||
10838 | } else | ||||
10839 | Cand->Conversions[ConvIdx].setEllipsis(); | ||||
10840 | } | ||||
10841 | } | ||||
10842 | |||||
10843 | SmallVector<OverloadCandidate *, 32> OverloadCandidateSet::CompleteCandidates( | ||||
10844 | Sema &S, OverloadCandidateDisplayKind OCD, ArrayRef<Expr *> Args, | ||||
10845 | SourceLocation OpLoc, | ||||
10846 | llvm::function_ref<bool(OverloadCandidate &)> Filter) { | ||||
10847 | // Sort the candidates by viability and position. Sorting directly would | ||||
10848 | // be prohibitive, so we make a set of pointers and sort those. | ||||
10849 | SmallVector<OverloadCandidate*, 32> Cands; | ||||
10850 | if (OCD == OCD_AllCandidates) Cands.reserve(size()); | ||||
10851 | for (iterator Cand = begin(), LastCand = end(); Cand != LastCand; ++Cand) { | ||||
10852 | if (!Filter(*Cand)) | ||||
10853 | continue; | ||||
10854 | if (Cand->Viable) | ||||
10855 | Cands.push_back(Cand); | ||||
10856 | else if (OCD == OCD_AllCandidates) { | ||||
10857 | CompleteNonViableCandidate(S, Cand, Args); | ||||
10858 | if (Cand->Function || Cand->IsSurrogate) | ||||
10859 | Cands.push_back(Cand); | ||||
10860 | // Otherwise, this a non-viable builtin candidate. We do not, in general, | ||||
10861 | // want to list every possible builtin candidate. | ||||
10862 | } | ||||
10863 | } | ||||
10864 | |||||
10865 | llvm::stable_sort( | ||||
10866 | Cands, CompareOverloadCandidatesForDisplay(S, OpLoc, Args.size(), Kind)); | ||||
10867 | |||||
10868 | return Cands; | ||||
10869 | } | ||||
10870 | |||||
10871 | /// When overload resolution fails, prints diagnostic messages containing the | ||||
10872 | /// candidates in the candidate set. | ||||
10873 | void OverloadCandidateSet::NoteCandidates(PartialDiagnosticAt PD, | ||||
10874 | Sema &S, OverloadCandidateDisplayKind OCD, ArrayRef<Expr *> Args, | ||||
10875 | StringRef Opc, SourceLocation OpLoc, | ||||
10876 | llvm::function_ref<bool(OverloadCandidate &)> Filter) { | ||||
10877 | |||||
10878 | auto Cands = CompleteCandidates(S, OCD, Args, OpLoc, Filter); | ||||
10879 | |||||
10880 | S.Diag(PD.first, PD.second); | ||||
10881 | |||||
10882 | NoteCandidates(S, Args, Cands, Opc, OpLoc); | ||||
10883 | } | ||||
10884 | |||||
10885 | void OverloadCandidateSet::NoteCandidates(Sema &S, ArrayRef<Expr *> Args, | ||||
10886 | ArrayRef<OverloadCandidate *> Cands, | ||||
10887 | StringRef Opc, SourceLocation OpLoc) { | ||||
10888 | bool ReportedAmbiguousConversions = false; | ||||
10889 | |||||
10890 | const OverloadsShown ShowOverloads = S.Diags.getShowOverloads(); | ||||
10891 | unsigned CandsShown = 0; | ||||
10892 | auto I = Cands.begin(), E = Cands.end(); | ||||
10893 | for (; I != E; ++I) { | ||||
10894 | OverloadCandidate *Cand = *I; | ||||
10895 | |||||
10896 | // Set an arbitrary limit on the number of candidate functions we'll spam | ||||
10897 | // the user with. FIXME: This limit should depend on details of the | ||||
10898 | // candidate list. | ||||
10899 | if (CandsShown >= 4 && ShowOverloads == Ovl_Best) { | ||||
10900 | break; | ||||
10901 | } | ||||
10902 | ++CandsShown; | ||||
10903 | |||||
10904 | if (Cand->Function) | ||||
10905 | NoteFunctionCandidate(S, Cand, Args.size(), | ||||
10906 | /*TakingCandidateAddress=*/false, DestAS); | ||||
10907 | else if (Cand->IsSurrogate) | ||||
10908 | NoteSurrogateCandidate(S, Cand); | ||||
10909 | else { | ||||
10910 | assert(Cand->Viable &&((Cand->Viable && "Non-viable built-in candidates are not added to Cands." ) ? static_cast<void> (0) : __assert_fail ("Cand->Viable && \"Non-viable built-in candidates are not added to Cands.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10911, __PRETTY_FUNCTION__)) | ||||
10911 | "Non-viable built-in candidates are not added to Cands.")((Cand->Viable && "Non-viable built-in candidates are not added to Cands." ) ? static_cast<void> (0) : __assert_fail ("Cand->Viable && \"Non-viable built-in candidates are not added to Cands.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 10911, __PRETTY_FUNCTION__)); | ||||
10912 | // Generally we only see ambiguities including viable builtin | ||||
10913 | // operators if overload resolution got screwed up by an | ||||
10914 | // ambiguous user-defined conversion. | ||||
10915 | // | ||||
10916 | // FIXME: It's quite possible for different conversions to see | ||||
10917 | // different ambiguities, though. | ||||
10918 | if (!ReportedAmbiguousConversions) { | ||||
10919 | NoteAmbiguousUserConversions(S, OpLoc, Cand); | ||||
10920 | ReportedAmbiguousConversions = true; | ||||
10921 | } | ||||
10922 | |||||
10923 | // If this is a viable builtin, print it. | ||||
10924 | NoteBuiltinOperatorCandidate(S, Opc, OpLoc, Cand); | ||||
10925 | } | ||||
10926 | } | ||||
10927 | |||||
10928 | if (I != E) | ||||
10929 | S.Diag(OpLoc, diag::note_ovl_too_many_candidates) << int(E - I); | ||||
10930 | } | ||||
10931 | |||||
10932 | static SourceLocation | ||||
10933 | GetLocationForCandidate(const TemplateSpecCandidate *Cand) { | ||||
10934 | return Cand->Specialization ? Cand->Specialization->getLocation() | ||||
10935 | : SourceLocation(); | ||||
10936 | } | ||||
10937 | |||||
10938 | namespace { | ||||
10939 | struct CompareTemplateSpecCandidatesForDisplay { | ||||
10940 | Sema &S; | ||||
10941 | CompareTemplateSpecCandidatesForDisplay(Sema &S) : S(S) {} | ||||
10942 | |||||
10943 | bool operator()(const TemplateSpecCandidate *L, | ||||
10944 | const TemplateSpecCandidate *R) { | ||||
10945 | // Fast-path this check. | ||||
10946 | if (L == R) | ||||
10947 | return false; | ||||
10948 | |||||
10949 | // Assuming that both candidates are not matches... | ||||
10950 | |||||
10951 | // Sort by the ranking of deduction failures. | ||||
10952 | if (L->DeductionFailure.Result != R->DeductionFailure.Result) | ||||
10953 | return RankDeductionFailure(L->DeductionFailure) < | ||||
10954 | RankDeductionFailure(R->DeductionFailure); | ||||
10955 | |||||
10956 | // Sort everything else by location. | ||||
10957 | SourceLocation LLoc = GetLocationForCandidate(L); | ||||
10958 | SourceLocation RLoc = GetLocationForCandidate(R); | ||||
10959 | |||||
10960 | // Put candidates without locations (e.g. builtins) at the end. | ||||
10961 | if (LLoc.isInvalid()) | ||||
10962 | return false; | ||||
10963 | if (RLoc.isInvalid()) | ||||
10964 | return true; | ||||
10965 | |||||
10966 | return S.SourceMgr.isBeforeInTranslationUnit(LLoc, RLoc); | ||||
10967 | } | ||||
10968 | }; | ||||
10969 | } | ||||
10970 | |||||
10971 | /// Diagnose a template argument deduction failure. | ||||
10972 | /// We are treating these failures as overload failures due to bad | ||||
10973 | /// deductions. | ||||
10974 | void TemplateSpecCandidate::NoteDeductionFailure(Sema &S, | ||||
10975 | bool ForTakingAddress) { | ||||
10976 | DiagnoseBadDeduction(S, FoundDecl, Specialization, // pattern | ||||
10977 | DeductionFailure, /*NumArgs=*/0, ForTakingAddress); | ||||
10978 | } | ||||
10979 | |||||
10980 | void TemplateSpecCandidateSet::destroyCandidates() { | ||||
10981 | for (iterator i = begin(), e = end(); i != e; ++i) { | ||||
10982 | i->DeductionFailure.Destroy(); | ||||
10983 | } | ||||
10984 | } | ||||
10985 | |||||
10986 | void TemplateSpecCandidateSet::clear() { | ||||
10987 | destroyCandidates(); | ||||
10988 | Candidates.clear(); | ||||
10989 | } | ||||
10990 | |||||
10991 | /// NoteCandidates - When no template specialization match is found, prints | ||||
10992 | /// diagnostic messages containing the non-matching specializations that form | ||||
10993 | /// the candidate set. | ||||
10994 | /// This is analoguous to OverloadCandidateSet::NoteCandidates() with | ||||
10995 | /// OCD == OCD_AllCandidates and Cand->Viable == false. | ||||
10996 | void TemplateSpecCandidateSet::NoteCandidates(Sema &S, SourceLocation Loc) { | ||||
10997 | // Sort the candidates by position (assuming no candidate is a match). | ||||
10998 | // Sorting directly would be prohibitive, so we make a set of pointers | ||||
10999 | // and sort those. | ||||
11000 | SmallVector<TemplateSpecCandidate *, 32> Cands; | ||||
11001 | Cands.reserve(size()); | ||||
11002 | for (iterator Cand = begin(), LastCand = end(); Cand != LastCand; ++Cand) { | ||||
11003 | if (Cand->Specialization) | ||||
11004 | Cands.push_back(Cand); | ||||
11005 | // Otherwise, this is a non-matching builtin candidate. We do not, | ||||
11006 | // in general, want to list every possible builtin candidate. | ||||
11007 | } | ||||
11008 | |||||
11009 | llvm::sort(Cands, CompareTemplateSpecCandidatesForDisplay(S)); | ||||
11010 | |||||
11011 | // FIXME: Perhaps rename OverloadsShown and getShowOverloads() | ||||
11012 | // for generalization purposes (?). | ||||
11013 | const OverloadsShown ShowOverloads = S.Diags.getShowOverloads(); | ||||
11014 | |||||
11015 | SmallVectorImpl<TemplateSpecCandidate *>::iterator I, E; | ||||
11016 | unsigned CandsShown = 0; | ||||
11017 | for (I = Cands.begin(), E = Cands.end(); I != E; ++I) { | ||||
11018 | TemplateSpecCandidate *Cand = *I; | ||||
11019 | |||||
11020 | // Set an arbitrary limit on the number of candidates we'll spam | ||||
11021 | // the user with. FIXME: This limit should depend on details of the | ||||
11022 | // candidate list. | ||||
11023 | if (CandsShown >= 4 && ShowOverloads == Ovl_Best) | ||||
11024 | break; | ||||
11025 | ++CandsShown; | ||||
11026 | |||||
11027 | assert(Cand->Specialization &&((Cand->Specialization && "Non-matching built-in candidates are not added to Cands." ) ? static_cast<void> (0) : __assert_fail ("Cand->Specialization && \"Non-matching built-in candidates are not added to Cands.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11028, __PRETTY_FUNCTION__)) | ||||
11028 | "Non-matching built-in candidates are not added to Cands.")((Cand->Specialization && "Non-matching built-in candidates are not added to Cands." ) ? static_cast<void> (0) : __assert_fail ("Cand->Specialization && \"Non-matching built-in candidates are not added to Cands.\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11028, __PRETTY_FUNCTION__)); | ||||
11029 | Cand->NoteDeductionFailure(S, ForTakingAddress); | ||||
11030 | } | ||||
11031 | |||||
11032 | if (I != E) | ||||
11033 | S.Diag(Loc, diag::note_ovl_too_many_candidates) << int(E - I); | ||||
11034 | } | ||||
11035 | |||||
11036 | // [PossiblyAFunctionType] --> [Return] | ||||
11037 | // NonFunctionType --> NonFunctionType | ||||
11038 | // R (A) --> R(A) | ||||
11039 | // R (*)(A) --> R (A) | ||||
11040 | // R (&)(A) --> R (A) | ||||
11041 | // R (S::*)(A) --> R (A) | ||||
11042 | QualType Sema::ExtractUnqualifiedFunctionType(QualType PossiblyAFunctionType) { | ||||
11043 | QualType Ret = PossiblyAFunctionType; | ||||
11044 | if (const PointerType *ToTypePtr = | ||||
11045 | PossiblyAFunctionType->getAs<PointerType>()) | ||||
11046 | Ret = ToTypePtr->getPointeeType(); | ||||
11047 | else if (const ReferenceType *ToTypeRef = | ||||
11048 | PossiblyAFunctionType->getAs<ReferenceType>()) | ||||
11049 | Ret = ToTypeRef->getPointeeType(); | ||||
11050 | else if (const MemberPointerType *MemTypePtr = | ||||
11051 | PossiblyAFunctionType->getAs<MemberPointerType>()) | ||||
11052 | Ret = MemTypePtr->getPointeeType(); | ||||
11053 | Ret = | ||||
11054 | Context.getCanonicalType(Ret).getUnqualifiedType(); | ||||
11055 | return Ret; | ||||
11056 | } | ||||
11057 | |||||
11058 | static bool completeFunctionType(Sema &S, FunctionDecl *FD, SourceLocation Loc, | ||||
11059 | bool Complain = true) { | ||||
11060 | if (S.getLangOpts().CPlusPlus14 && FD->getReturnType()->isUndeducedType() && | ||||
11061 | S.DeduceReturnType(FD, Loc, Complain)) | ||||
11062 | return true; | ||||
11063 | |||||
11064 | auto *FPT = FD->getType()->castAs<FunctionProtoType>(); | ||||
11065 | if (S.getLangOpts().CPlusPlus17 && | ||||
11066 | isUnresolvedExceptionSpec(FPT->getExceptionSpecType()) && | ||||
11067 | !S.ResolveExceptionSpec(Loc, FPT)) | ||||
11068 | return true; | ||||
11069 | |||||
11070 | return false; | ||||
11071 | } | ||||
11072 | |||||
11073 | namespace { | ||||
11074 | // A helper class to help with address of function resolution | ||||
11075 | // - allows us to avoid passing around all those ugly parameters | ||||
11076 | class AddressOfFunctionResolver { | ||||
11077 | Sema& S; | ||||
11078 | Expr* SourceExpr; | ||||
11079 | const QualType& TargetType; | ||||
11080 | QualType TargetFunctionType; // Extracted function type from target type | ||||
11081 | |||||
11082 | bool Complain; | ||||
11083 | //DeclAccessPair& ResultFunctionAccessPair; | ||||
11084 | ASTContext& Context; | ||||
11085 | |||||
11086 | bool TargetTypeIsNonStaticMemberFunction; | ||||
11087 | bool FoundNonTemplateFunction; | ||||
11088 | bool StaticMemberFunctionFromBoundPointer; | ||||
11089 | bool HasComplained; | ||||
11090 | |||||
11091 | OverloadExpr::FindResult OvlExprInfo; | ||||
11092 | OverloadExpr *OvlExpr; | ||||
11093 | TemplateArgumentListInfo OvlExplicitTemplateArgs; | ||||
11094 | SmallVector<std::pair<DeclAccessPair, FunctionDecl*>, 4> Matches; | ||||
11095 | TemplateSpecCandidateSet FailedCandidates; | ||||
11096 | |||||
11097 | public: | ||||
11098 | AddressOfFunctionResolver(Sema &S, Expr *SourceExpr, | ||||
11099 | const QualType &TargetType, bool Complain) | ||||
11100 | : S(S), SourceExpr(SourceExpr), TargetType(TargetType), | ||||
11101 | Complain(Complain), Context(S.getASTContext()), | ||||
11102 | TargetTypeIsNonStaticMemberFunction( | ||||
11103 | !!TargetType->getAs<MemberPointerType>()), | ||||
11104 | FoundNonTemplateFunction(false), | ||||
11105 | StaticMemberFunctionFromBoundPointer(false), | ||||
11106 | HasComplained(false), | ||||
11107 | OvlExprInfo(OverloadExpr::find(SourceExpr)), | ||||
11108 | OvlExpr(OvlExprInfo.Expression), | ||||
11109 | FailedCandidates(OvlExpr->getNameLoc(), /*ForTakingAddress=*/true) { | ||||
11110 | ExtractUnqualifiedFunctionTypeFromTargetType(); | ||||
11111 | |||||
11112 | if (TargetFunctionType->isFunctionType()) { | ||||
11113 | if (UnresolvedMemberExpr *UME = dyn_cast<UnresolvedMemberExpr>(OvlExpr)) | ||||
11114 | if (!UME->isImplicitAccess() && | ||||
11115 | !S.ResolveSingleFunctionTemplateSpecialization(UME)) | ||||
11116 | StaticMemberFunctionFromBoundPointer = true; | ||||
11117 | } else if (OvlExpr->hasExplicitTemplateArgs()) { | ||||
11118 | DeclAccessPair dap; | ||||
11119 | if (FunctionDecl *Fn = S.ResolveSingleFunctionTemplateSpecialization( | ||||
11120 | OvlExpr, false, &dap)) { | ||||
11121 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) | ||||
11122 | if (!Method->isStatic()) { | ||||
11123 | // If the target type is a non-function type and the function found | ||||
11124 | // is a non-static member function, pretend as if that was the | ||||
11125 | // target, it's the only possible type to end up with. | ||||
11126 | TargetTypeIsNonStaticMemberFunction = true; | ||||
11127 | |||||
11128 | // And skip adding the function if its not in the proper form. | ||||
11129 | // We'll diagnose this due to an empty set of functions. | ||||
11130 | if (!OvlExprInfo.HasFormOfMemberPointer) | ||||
11131 | return; | ||||
11132 | } | ||||
11133 | |||||
11134 | Matches.push_back(std::make_pair(dap, Fn)); | ||||
11135 | } | ||||
11136 | return; | ||||
11137 | } | ||||
11138 | |||||
11139 | if (OvlExpr->hasExplicitTemplateArgs()) | ||||
11140 | OvlExpr->copyTemplateArgumentsInto(OvlExplicitTemplateArgs); | ||||
11141 | |||||
11142 | if (FindAllFunctionsThatMatchTargetTypeExactly()) { | ||||
11143 | // C++ [over.over]p4: | ||||
11144 | // If more than one function is selected, [...] | ||||
11145 | if (Matches.size() > 1 && !eliminiateSuboptimalOverloadCandidates()) { | ||||
11146 | if (FoundNonTemplateFunction) | ||||
11147 | EliminateAllTemplateMatches(); | ||||
11148 | else | ||||
11149 | EliminateAllExceptMostSpecializedTemplate(); | ||||
11150 | } | ||||
11151 | } | ||||
11152 | |||||
11153 | if (S.getLangOpts().CUDA && Matches.size() > 1) | ||||
11154 | EliminateSuboptimalCudaMatches(); | ||||
11155 | } | ||||
11156 | |||||
11157 | bool hasComplained() const { return HasComplained; } | ||||
11158 | |||||
11159 | private: | ||||
11160 | bool candidateHasExactlyCorrectType(const FunctionDecl *FD) { | ||||
11161 | QualType Discard; | ||||
11162 | return Context.hasSameUnqualifiedType(TargetFunctionType, FD->getType()) || | ||||
11163 | S.IsFunctionConversion(FD->getType(), TargetFunctionType, Discard); | ||||
11164 | } | ||||
11165 | |||||
11166 | /// \return true if A is considered a better overload candidate for the | ||||
11167 | /// desired type than B. | ||||
11168 | bool isBetterCandidate(const FunctionDecl *A, const FunctionDecl *B) { | ||||
11169 | // If A doesn't have exactly the correct type, we don't want to classify it | ||||
11170 | // as "better" than anything else. This way, the user is required to | ||||
11171 | // disambiguate for us if there are multiple candidates and no exact match. | ||||
11172 | return candidateHasExactlyCorrectType(A) && | ||||
11173 | (!candidateHasExactlyCorrectType(B) || | ||||
11174 | compareEnableIfAttrs(S, A, B) == Comparison::Better); | ||||
11175 | } | ||||
11176 | |||||
11177 | /// \return true if we were able to eliminate all but one overload candidate, | ||||
11178 | /// false otherwise. | ||||
11179 | bool eliminiateSuboptimalOverloadCandidates() { | ||||
11180 | // Same algorithm as overload resolution -- one pass to pick the "best", | ||||
11181 | // another pass to be sure that nothing is better than the best. | ||||
11182 | auto Best = Matches.begin(); | ||||
11183 | for (auto I = Matches.begin()+1, E = Matches.end(); I != E; ++I) | ||||
11184 | if (isBetterCandidate(I->second, Best->second)) | ||||
11185 | Best = I; | ||||
11186 | |||||
11187 | const FunctionDecl *BestFn = Best->second; | ||||
11188 | auto IsBestOrInferiorToBest = [this, BestFn]( | ||||
11189 | const std::pair<DeclAccessPair, FunctionDecl *> &Pair) { | ||||
11190 | return BestFn == Pair.second || isBetterCandidate(BestFn, Pair.second); | ||||
11191 | }; | ||||
11192 | |||||
11193 | // Note: We explicitly leave Matches unmodified if there isn't a clear best | ||||
11194 | // option, so we can potentially give the user a better error | ||||
11195 | if (!llvm::all_of(Matches, IsBestOrInferiorToBest)) | ||||
11196 | return false; | ||||
11197 | Matches[0] = *Best; | ||||
11198 | Matches.resize(1); | ||||
11199 | return true; | ||||
11200 | } | ||||
11201 | |||||
11202 | bool isTargetTypeAFunction() const { | ||||
11203 | return TargetFunctionType->isFunctionType(); | ||||
11204 | } | ||||
11205 | |||||
11206 | // [ToType] [Return] | ||||
11207 | |||||
11208 | // R (*)(A) --> R (A), IsNonStaticMemberFunction = false | ||||
11209 | // R (&)(A) --> R (A), IsNonStaticMemberFunction = false | ||||
11210 | // R (S::*)(A) --> R (A), IsNonStaticMemberFunction = true | ||||
11211 | void inline ExtractUnqualifiedFunctionTypeFromTargetType() { | ||||
11212 | TargetFunctionType = S.ExtractUnqualifiedFunctionType(TargetType); | ||||
11213 | } | ||||
11214 | |||||
11215 | // return true if any matching specializations were found | ||||
11216 | bool AddMatchingTemplateFunction(FunctionTemplateDecl* FunctionTemplate, | ||||
11217 | const DeclAccessPair& CurAccessFunPair) { | ||||
11218 | if (CXXMethodDecl *Method | ||||
11219 | = dyn_cast<CXXMethodDecl>(FunctionTemplate->getTemplatedDecl())) { | ||||
11220 | // Skip non-static function templates when converting to pointer, and | ||||
11221 | // static when converting to member pointer. | ||||
11222 | if (Method->isStatic() == TargetTypeIsNonStaticMemberFunction) | ||||
11223 | return false; | ||||
11224 | } | ||||
11225 | else if (TargetTypeIsNonStaticMemberFunction) | ||||
11226 | return false; | ||||
11227 | |||||
11228 | // C++ [over.over]p2: | ||||
11229 | // If the name is a function template, template argument deduction is | ||||
11230 | // done (14.8.2.2), and if the argument deduction succeeds, the | ||||
11231 | // resulting template argument list is used to generate a single | ||||
11232 | // function template specialization, which is added to the set of | ||||
11233 | // overloaded functions considered. | ||||
11234 | FunctionDecl *Specialization = nullptr; | ||||
11235 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); | ||||
11236 | if (Sema::TemplateDeductionResult Result | ||||
11237 | = S.DeduceTemplateArguments(FunctionTemplate, | ||||
11238 | &OvlExplicitTemplateArgs, | ||||
11239 | TargetFunctionType, Specialization, | ||||
11240 | Info, /*IsAddressOfFunction*/true)) { | ||||
11241 | // Make a note of the failed deduction for diagnostics. | ||||
11242 | FailedCandidates.addCandidate() | ||||
11243 | .set(CurAccessFunPair, FunctionTemplate->getTemplatedDecl(), | ||||
11244 | MakeDeductionFailureInfo(Context, Result, Info)); | ||||
11245 | return false; | ||||
11246 | } | ||||
11247 | |||||
11248 | // Template argument deduction ensures that we have an exact match or | ||||
11249 | // compatible pointer-to-function arguments that would be adjusted by ICS. | ||||
11250 | // This function template specicalization works. | ||||
11251 | assert(S.isSameOrCompatibleFunctionType(((S.isSameOrCompatibleFunctionType( Context.getCanonicalType( Specialization->getType()), Context.getCanonicalType(TargetFunctionType ))) ? static_cast<void> (0) : __assert_fail ("S.isSameOrCompatibleFunctionType( Context.getCanonicalType(Specialization->getType()), Context.getCanonicalType(TargetFunctionType))" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11253, __PRETTY_FUNCTION__)) | ||||
11252 | Context.getCanonicalType(Specialization->getType()),((S.isSameOrCompatibleFunctionType( Context.getCanonicalType( Specialization->getType()), Context.getCanonicalType(TargetFunctionType ))) ? static_cast<void> (0) : __assert_fail ("S.isSameOrCompatibleFunctionType( Context.getCanonicalType(Specialization->getType()), Context.getCanonicalType(TargetFunctionType))" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11253, __PRETTY_FUNCTION__)) | ||||
11253 | Context.getCanonicalType(TargetFunctionType)))((S.isSameOrCompatibleFunctionType( Context.getCanonicalType( Specialization->getType()), Context.getCanonicalType(TargetFunctionType ))) ? static_cast<void> (0) : __assert_fail ("S.isSameOrCompatibleFunctionType( Context.getCanonicalType(Specialization->getType()), Context.getCanonicalType(TargetFunctionType))" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11253, __PRETTY_FUNCTION__)); | ||||
11254 | |||||
11255 | if (!S.checkAddressOfFunctionIsAvailable(Specialization)) | ||||
11256 | return false; | ||||
11257 | |||||
11258 | Matches.push_back(std::make_pair(CurAccessFunPair, Specialization)); | ||||
11259 | return true; | ||||
11260 | } | ||||
11261 | |||||
11262 | bool AddMatchingNonTemplateFunction(NamedDecl* Fn, | ||||
11263 | const DeclAccessPair& CurAccessFunPair) { | ||||
11264 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) { | ||||
11265 | // Skip non-static functions when converting to pointer, and static | ||||
11266 | // when converting to member pointer. | ||||
11267 | if (Method->isStatic() == TargetTypeIsNonStaticMemberFunction) | ||||
11268 | return false; | ||||
11269 | } | ||||
11270 | else if (TargetTypeIsNonStaticMemberFunction) | ||||
11271 | return false; | ||||
11272 | |||||
11273 | if (FunctionDecl *FunDecl = dyn_cast<FunctionDecl>(Fn)) { | ||||
11274 | if (S.getLangOpts().CUDA) | ||||
11275 | if (FunctionDecl *Caller = dyn_cast<FunctionDecl>(S.CurContext)) | ||||
11276 | if (!Caller->isImplicit() && !S.IsAllowedCUDACall(Caller, FunDecl)) | ||||
11277 | return false; | ||||
11278 | if (FunDecl->isMultiVersion()) { | ||||
11279 | const auto *TA = FunDecl->getAttr<TargetAttr>(); | ||||
11280 | if (TA && !TA->isDefaultVersion()) | ||||
11281 | return false; | ||||
11282 | } | ||||
11283 | |||||
11284 | // If any candidate has a placeholder return type, trigger its deduction | ||||
11285 | // now. | ||||
11286 | if (completeFunctionType(S, FunDecl, SourceExpr->getBeginLoc(), | ||||
11287 | Complain)) { | ||||
11288 | HasComplained |= Complain; | ||||
11289 | return false; | ||||
11290 | } | ||||
11291 | |||||
11292 | if (!S.checkAddressOfFunctionIsAvailable(FunDecl)) | ||||
11293 | return false; | ||||
11294 | |||||
11295 | // If we're in C, we need to support types that aren't exactly identical. | ||||
11296 | if (!S.getLangOpts().CPlusPlus || | ||||
11297 | candidateHasExactlyCorrectType(FunDecl)) { | ||||
11298 | Matches.push_back(std::make_pair( | ||||
11299 | CurAccessFunPair, cast<FunctionDecl>(FunDecl->getCanonicalDecl()))); | ||||
11300 | FoundNonTemplateFunction = true; | ||||
11301 | return true; | ||||
11302 | } | ||||
11303 | } | ||||
11304 | |||||
11305 | return false; | ||||
11306 | } | ||||
11307 | |||||
11308 | bool FindAllFunctionsThatMatchTargetTypeExactly() { | ||||
11309 | bool Ret = false; | ||||
11310 | |||||
11311 | // If the overload expression doesn't have the form of a pointer to | ||||
11312 | // member, don't try to convert it to a pointer-to-member type. | ||||
11313 | if (IsInvalidFormOfPointerToMemberFunction()) | ||||
11314 | return false; | ||||
11315 | |||||
11316 | for (UnresolvedSetIterator I = OvlExpr->decls_begin(), | ||||
11317 | E = OvlExpr->decls_end(); | ||||
11318 | I != E; ++I) { | ||||
11319 | // Look through any using declarations to find the underlying function. | ||||
11320 | NamedDecl *Fn = (*I)->getUnderlyingDecl(); | ||||
11321 | |||||
11322 | // C++ [over.over]p3: | ||||
11323 | // Non-member functions and static member functions match | ||||
11324 | // targets of type "pointer-to-function" or "reference-to-function." | ||||
11325 | // Nonstatic member functions match targets of | ||||
11326 | // type "pointer-to-member-function." | ||||
11327 | // Note that according to DR 247, the containing class does not matter. | ||||
11328 | if (FunctionTemplateDecl *FunctionTemplate | ||||
11329 | = dyn_cast<FunctionTemplateDecl>(Fn)) { | ||||
11330 | if (AddMatchingTemplateFunction(FunctionTemplate, I.getPair())) | ||||
11331 | Ret = true; | ||||
11332 | } | ||||
11333 | // If we have explicit template arguments supplied, skip non-templates. | ||||
11334 | else if (!OvlExpr->hasExplicitTemplateArgs() && | ||||
11335 | AddMatchingNonTemplateFunction(Fn, I.getPair())) | ||||
11336 | Ret = true; | ||||
11337 | } | ||||
11338 | assert(Ret || Matches.empty())((Ret || Matches.empty()) ? static_cast<void> (0) : __assert_fail ("Ret || Matches.empty()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11338, __PRETTY_FUNCTION__)); | ||||
11339 | return Ret; | ||||
11340 | } | ||||
11341 | |||||
11342 | void EliminateAllExceptMostSpecializedTemplate() { | ||||
11343 | // [...] and any given function template specialization F1 is | ||||
11344 | // eliminated if the set contains a second function template | ||||
11345 | // specialization whose function template is more specialized | ||||
11346 | // than the function template of F1 according to the partial | ||||
11347 | // ordering rules of 14.5.5.2. | ||||
11348 | |||||
11349 | // The algorithm specified above is quadratic. We instead use a | ||||
11350 | // two-pass algorithm (similar to the one used to identify the | ||||
11351 | // best viable function in an overload set) that identifies the | ||||
11352 | // best function template (if it exists). | ||||
11353 | |||||
11354 | UnresolvedSet<4> MatchesCopy; // TODO: avoid! | ||||
11355 | for (unsigned I = 0, E = Matches.size(); I != E; ++I) | ||||
11356 | MatchesCopy.addDecl(Matches[I].second, Matches[I].first.getAccess()); | ||||
11357 | |||||
11358 | // TODO: It looks like FailedCandidates does not serve much purpose | ||||
11359 | // here, since the no_viable diagnostic has index 0. | ||||
11360 | UnresolvedSetIterator Result = S.getMostSpecialized( | ||||
11361 | MatchesCopy.begin(), MatchesCopy.end(), FailedCandidates, | ||||
11362 | SourceExpr->getBeginLoc(), S.PDiag(), | ||||
11363 | S.PDiag(diag::err_addr_ovl_ambiguous) | ||||
11364 | << Matches[0].second->getDeclName(), | ||||
11365 | S.PDiag(diag::note_ovl_candidate) | ||||
11366 | << (unsigned)oc_function << (unsigned)ocs_described_template, | ||||
11367 | Complain, TargetFunctionType); | ||||
11368 | |||||
11369 | if (Result != MatchesCopy.end()) { | ||||
11370 | // Make it the first and only element | ||||
11371 | Matches[0].first = Matches[Result - MatchesCopy.begin()].first; | ||||
11372 | Matches[0].second = cast<FunctionDecl>(*Result); | ||||
11373 | Matches.resize(1); | ||||
11374 | } else | ||||
11375 | HasComplained |= Complain; | ||||
11376 | } | ||||
11377 | |||||
11378 | void EliminateAllTemplateMatches() { | ||||
11379 | // [...] any function template specializations in the set are | ||||
11380 | // eliminated if the set also contains a non-template function, [...] | ||||
11381 | for (unsigned I = 0, N = Matches.size(); I != N; ) { | ||||
11382 | if (Matches[I].second->getPrimaryTemplate() == nullptr) | ||||
11383 | ++I; | ||||
11384 | else { | ||||
11385 | Matches[I] = Matches[--N]; | ||||
11386 | Matches.resize(N); | ||||
11387 | } | ||||
11388 | } | ||||
11389 | } | ||||
11390 | |||||
11391 | void EliminateSuboptimalCudaMatches() { | ||||
11392 | S.EraseUnwantedCUDAMatches(dyn_cast<FunctionDecl>(S.CurContext), Matches); | ||||
11393 | } | ||||
11394 | |||||
11395 | public: | ||||
11396 | void ComplainNoMatchesFound() const { | ||||
11397 | assert(Matches.empty())((Matches.empty()) ? static_cast<void> (0) : __assert_fail ("Matches.empty()", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11397, __PRETTY_FUNCTION__)); | ||||
11398 | S.Diag(OvlExpr->getBeginLoc(), diag::err_addr_ovl_no_viable) | ||||
11399 | << OvlExpr->getName() << TargetFunctionType | ||||
11400 | << OvlExpr->getSourceRange(); | ||||
11401 | if (FailedCandidates.empty()) | ||||
11402 | S.NoteAllOverloadCandidates(OvlExpr, TargetFunctionType, | ||||
11403 | /*TakingAddress=*/true); | ||||
11404 | else { | ||||
11405 | // We have some deduction failure messages. Use them to diagnose | ||||
11406 | // the function templates, and diagnose the non-template candidates | ||||
11407 | // normally. | ||||
11408 | for (UnresolvedSetIterator I = OvlExpr->decls_begin(), | ||||
11409 | IEnd = OvlExpr->decls_end(); | ||||
11410 | I != IEnd; ++I) | ||||
11411 | if (FunctionDecl *Fun = | ||||
11412 | dyn_cast<FunctionDecl>((*I)->getUnderlyingDecl())) | ||||
11413 | if (!functionHasPassObjectSizeParams(Fun)) | ||||
11414 | S.NoteOverloadCandidate(*I, Fun, TargetFunctionType, | ||||
11415 | /*TakingAddress=*/true); | ||||
11416 | FailedCandidates.NoteCandidates(S, OvlExpr->getBeginLoc()); | ||||
11417 | } | ||||
11418 | } | ||||
11419 | |||||
11420 | bool IsInvalidFormOfPointerToMemberFunction() const { | ||||
11421 | return TargetTypeIsNonStaticMemberFunction && | ||||
11422 | !OvlExprInfo.HasFormOfMemberPointer; | ||||
11423 | } | ||||
11424 | |||||
11425 | void ComplainIsInvalidFormOfPointerToMemberFunction() const { | ||||
11426 | // TODO: Should we condition this on whether any functions might | ||||
11427 | // have matched, or is it more appropriate to do that in callers? | ||||
11428 | // TODO: a fixit wouldn't hurt. | ||||
11429 | S.Diag(OvlExpr->getNameLoc(), diag::err_addr_ovl_no_qualifier) | ||||
11430 | << TargetType << OvlExpr->getSourceRange(); | ||||
11431 | } | ||||
11432 | |||||
11433 | bool IsStaticMemberFunctionFromBoundPointer() const { | ||||
11434 | return StaticMemberFunctionFromBoundPointer; | ||||
11435 | } | ||||
11436 | |||||
11437 | void ComplainIsStaticMemberFunctionFromBoundPointer() const { | ||||
11438 | S.Diag(OvlExpr->getBeginLoc(), | ||||
11439 | diag::err_invalid_form_pointer_member_function) | ||||
11440 | << OvlExpr->getSourceRange(); | ||||
11441 | } | ||||
11442 | |||||
11443 | void ComplainOfInvalidConversion() const { | ||||
11444 | S.Diag(OvlExpr->getBeginLoc(), diag::err_addr_ovl_not_func_ptrref) | ||||
11445 | << OvlExpr->getName() << TargetType; | ||||
11446 | } | ||||
11447 | |||||
11448 | void ComplainMultipleMatchesFound() const { | ||||
11449 | assert(Matches.size() > 1)((Matches.size() > 1) ? static_cast<void> (0) : __assert_fail ("Matches.size() > 1", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11449, __PRETTY_FUNCTION__)); | ||||
11450 | S.Diag(OvlExpr->getBeginLoc(), diag::err_addr_ovl_ambiguous) | ||||
11451 | << OvlExpr->getName() << OvlExpr->getSourceRange(); | ||||
11452 | S.NoteAllOverloadCandidates(OvlExpr, TargetFunctionType, | ||||
11453 | /*TakingAddress=*/true); | ||||
11454 | } | ||||
11455 | |||||
11456 | bool hadMultipleCandidates() const { return (OvlExpr->getNumDecls() > 1); } | ||||
11457 | |||||
11458 | int getNumMatches() const { return Matches.size(); } | ||||
11459 | |||||
11460 | FunctionDecl* getMatchingFunctionDecl() const { | ||||
11461 | if (Matches.size() != 1) return nullptr; | ||||
11462 | return Matches[0].second; | ||||
11463 | } | ||||
11464 | |||||
11465 | const DeclAccessPair* getMatchingFunctionAccessPair() const { | ||||
11466 | if (Matches.size() != 1) return nullptr; | ||||
11467 | return &Matches[0].first; | ||||
11468 | } | ||||
11469 | }; | ||||
11470 | } | ||||
11471 | |||||
11472 | /// ResolveAddressOfOverloadedFunction - Try to resolve the address of | ||||
11473 | /// an overloaded function (C++ [over.over]), where @p From is an | ||||
11474 | /// expression with overloaded function type and @p ToType is the type | ||||
11475 | /// we're trying to resolve to. For example: | ||||
11476 | /// | ||||
11477 | /// @code | ||||
11478 | /// int f(double); | ||||
11479 | /// int f(int); | ||||
11480 | /// | ||||
11481 | /// int (*pfd)(double) = f; // selects f(double) | ||||
11482 | /// @endcode | ||||
11483 | /// | ||||
11484 | /// This routine returns the resulting FunctionDecl if it could be | ||||
11485 | /// resolved, and NULL otherwise. When @p Complain is true, this | ||||
11486 | /// routine will emit diagnostics if there is an error. | ||||
11487 | FunctionDecl * | ||||
11488 | Sema::ResolveAddressOfOverloadedFunction(Expr *AddressOfExpr, | ||||
11489 | QualType TargetType, | ||||
11490 | bool Complain, | ||||
11491 | DeclAccessPair &FoundResult, | ||||
11492 | bool *pHadMultipleCandidates) { | ||||
11493 | assert(AddressOfExpr->getType() == Context.OverloadTy)((AddressOfExpr->getType() == Context.OverloadTy) ? static_cast <void> (0) : __assert_fail ("AddressOfExpr->getType() == Context.OverloadTy" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11493, __PRETTY_FUNCTION__)); | ||||
11494 | |||||
11495 | AddressOfFunctionResolver Resolver(*this, AddressOfExpr, TargetType, | ||||
11496 | Complain); | ||||
11497 | int NumMatches = Resolver.getNumMatches(); | ||||
11498 | FunctionDecl *Fn = nullptr; | ||||
11499 | bool ShouldComplain = Complain && !Resolver.hasComplained(); | ||||
11500 | if (NumMatches == 0 && ShouldComplain) { | ||||
11501 | if (Resolver.IsInvalidFormOfPointerToMemberFunction()) | ||||
11502 | Resolver.ComplainIsInvalidFormOfPointerToMemberFunction(); | ||||
11503 | else | ||||
11504 | Resolver.ComplainNoMatchesFound(); | ||||
11505 | } | ||||
11506 | else if (NumMatches > 1 && ShouldComplain) | ||||
11507 | Resolver.ComplainMultipleMatchesFound(); | ||||
11508 | else if (NumMatches == 1) { | ||||
11509 | Fn = Resolver.getMatchingFunctionDecl(); | ||||
11510 | assert(Fn)((Fn) ? static_cast<void> (0) : __assert_fail ("Fn", "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11510, __PRETTY_FUNCTION__)); | ||||
11511 | if (auto *FPT = Fn->getType()->getAs<FunctionProtoType>()) | ||||
11512 | ResolveExceptionSpec(AddressOfExpr->getExprLoc(), FPT); | ||||
11513 | FoundResult = *Resolver.getMatchingFunctionAccessPair(); | ||||
11514 | if (Complain) { | ||||
11515 | if (Resolver.IsStaticMemberFunctionFromBoundPointer()) | ||||
11516 | Resolver.ComplainIsStaticMemberFunctionFromBoundPointer(); | ||||
11517 | else | ||||
11518 | CheckAddressOfMemberAccess(AddressOfExpr, FoundResult); | ||||
11519 | } | ||||
11520 | } | ||||
11521 | |||||
11522 | if (pHadMultipleCandidates) | ||||
11523 | *pHadMultipleCandidates = Resolver.hadMultipleCandidates(); | ||||
11524 | return Fn; | ||||
11525 | } | ||||
11526 | |||||
11527 | /// Given an expression that refers to an overloaded function, try to | ||||
11528 | /// resolve that function to a single function that can have its address taken. | ||||
11529 | /// This will modify `Pair` iff it returns non-null. | ||||
11530 | /// | ||||
11531 | /// This routine can only realistically succeed if all but one candidates in the | ||||
11532 | /// overload set for SrcExpr cannot have their addresses taken. | ||||
11533 | FunctionDecl * | ||||
11534 | Sema::resolveAddressOfOnlyViableOverloadCandidate(Expr *E, | ||||
11535 | DeclAccessPair &Pair) { | ||||
11536 | OverloadExpr::FindResult R = OverloadExpr::find(E); | ||||
11537 | OverloadExpr *Ovl = R.Expression; | ||||
11538 | FunctionDecl *Result = nullptr; | ||||
11539 | DeclAccessPair DAP; | ||||
11540 | // Don't use the AddressOfResolver because we're specifically looking for | ||||
11541 | // cases where we have one overload candidate that lacks | ||||
11542 | // enable_if/pass_object_size/... | ||||
11543 | for (auto I = Ovl->decls_begin(), E = Ovl->decls_end(); I != E; ++I) { | ||||
11544 | auto *FD = dyn_cast<FunctionDecl>(I->getUnderlyingDecl()); | ||||
11545 | if (!FD) | ||||
11546 | return nullptr; | ||||
11547 | |||||
11548 | if (!checkAddressOfFunctionIsAvailable(FD)) | ||||
11549 | continue; | ||||
11550 | |||||
11551 | // We have more than one result; quit. | ||||
11552 | if (Result) | ||||
11553 | return nullptr; | ||||
11554 | DAP = I.getPair(); | ||||
11555 | Result = FD; | ||||
11556 | } | ||||
11557 | |||||
11558 | if (Result) | ||||
11559 | Pair = DAP; | ||||
11560 | return Result; | ||||
11561 | } | ||||
11562 | |||||
11563 | /// Given an overloaded function, tries to turn it into a non-overloaded | ||||
11564 | /// function reference using resolveAddressOfOnlyViableOverloadCandidate. This | ||||
11565 | /// will perform access checks, diagnose the use of the resultant decl, and, if | ||||
11566 | /// requested, potentially perform a function-to-pointer decay. | ||||
11567 | /// | ||||
11568 | /// Returns false if resolveAddressOfOnlyViableOverloadCandidate fails. | ||||
11569 | /// Otherwise, returns true. This may emit diagnostics and return true. | ||||
11570 | bool Sema::resolveAndFixAddressOfOnlyViableOverloadCandidate( | ||||
11571 | ExprResult &SrcExpr, bool DoFunctionPointerConverion) { | ||||
11572 | Expr *E = SrcExpr.get(); | ||||
11573 | assert(E->getType() == Context.OverloadTy && "SrcExpr must be an overload")((E->getType() == Context.OverloadTy && "SrcExpr must be an overload" ) ? static_cast<void> (0) : __assert_fail ("E->getType() == Context.OverloadTy && \"SrcExpr must be an overload\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11573, __PRETTY_FUNCTION__)); | ||||
11574 | |||||
11575 | DeclAccessPair DAP; | ||||
11576 | FunctionDecl *Found = resolveAddressOfOnlyViableOverloadCandidate(E, DAP); | ||||
11577 | if (!Found || Found->isCPUDispatchMultiVersion() || | ||||
11578 | Found->isCPUSpecificMultiVersion()) | ||||
11579 | return false; | ||||
11580 | |||||
11581 | // Emitting multiple diagnostics for a function that is both inaccessible and | ||||
11582 | // unavailable is consistent with our behavior elsewhere. So, always check | ||||
11583 | // for both. | ||||
11584 | DiagnoseUseOfDecl(Found, E->getExprLoc()); | ||||
11585 | CheckAddressOfMemberAccess(E, DAP); | ||||
11586 | Expr *Fixed = FixOverloadedFunctionReference(E, DAP, Found); | ||||
11587 | if (DoFunctionPointerConverion && Fixed->getType()->isFunctionType()) | ||||
11588 | SrcExpr = DefaultFunctionArrayConversion(Fixed, /*Diagnose=*/false); | ||||
11589 | else | ||||
11590 | SrcExpr = Fixed; | ||||
11591 | return true; | ||||
11592 | } | ||||
11593 | |||||
11594 | /// Given an expression that refers to an overloaded function, try to | ||||
11595 | /// resolve that overloaded function expression down to a single function. | ||||
11596 | /// | ||||
11597 | /// This routine can only resolve template-ids that refer to a single function | ||||
11598 | /// template, where that template-id refers to a single template whose template | ||||
11599 | /// arguments are either provided by the template-id or have defaults, | ||||
11600 | /// as described in C++0x [temp.arg.explicit]p3. | ||||
11601 | /// | ||||
11602 | /// If no template-ids are found, no diagnostics are emitted and NULL is | ||||
11603 | /// returned. | ||||
11604 | FunctionDecl * | ||||
11605 | Sema::ResolveSingleFunctionTemplateSpecialization(OverloadExpr *ovl, | ||||
11606 | bool Complain, | ||||
11607 | DeclAccessPair *FoundResult) { | ||||
11608 | // C++ [over.over]p1: | ||||
11609 | // [...] [Note: any redundant set of parentheses surrounding the | ||||
11610 | // overloaded function name is ignored (5.1). ] | ||||
11611 | // C++ [over.over]p1: | ||||
11612 | // [...] The overloaded function name can be preceded by the & | ||||
11613 | // operator. | ||||
11614 | |||||
11615 | // If we didn't actually find any template-ids, we're done. | ||||
11616 | if (!ovl->hasExplicitTemplateArgs()) | ||||
11617 | return nullptr; | ||||
11618 | |||||
11619 | TemplateArgumentListInfo ExplicitTemplateArgs; | ||||
11620 | ovl->copyTemplateArgumentsInto(ExplicitTemplateArgs); | ||||
11621 | TemplateSpecCandidateSet FailedCandidates(ovl->getNameLoc()); | ||||
11622 | |||||
11623 | // Look through all of the overloaded functions, searching for one | ||||
11624 | // whose type matches exactly. | ||||
11625 | FunctionDecl *Matched = nullptr; | ||||
11626 | for (UnresolvedSetIterator I = ovl->decls_begin(), | ||||
11627 | E = ovl->decls_end(); I != E; ++I) { | ||||
11628 | // C++0x [temp.arg.explicit]p3: | ||||
11629 | // [...] In contexts where deduction is done and fails, or in contexts | ||||
11630 | // where deduction is not done, if a template argument list is | ||||
11631 | // specified and it, along with any default template arguments, | ||||
11632 | // identifies a single function template specialization, then the | ||||
11633 | // template-id is an lvalue for the function template specialization. | ||||
11634 | FunctionTemplateDecl *FunctionTemplate | ||||
11635 | = cast<FunctionTemplateDecl>((*I)->getUnderlyingDecl()); | ||||
11636 | |||||
11637 | // C++ [over.over]p2: | ||||
11638 | // If the name is a function template, template argument deduction is | ||||
11639 | // done (14.8.2.2), and if the argument deduction succeeds, the | ||||
11640 | // resulting template argument list is used to generate a single | ||||
11641 | // function template specialization, which is added to the set of | ||||
11642 | // overloaded functions considered. | ||||
11643 | FunctionDecl *Specialization = nullptr; | ||||
11644 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); | ||||
11645 | if (TemplateDeductionResult Result | ||||
11646 | = DeduceTemplateArguments(FunctionTemplate, &ExplicitTemplateArgs, | ||||
11647 | Specialization, Info, | ||||
11648 | /*IsAddressOfFunction*/true)) { | ||||
11649 | // Make a note of the failed deduction for diagnostics. | ||||
11650 | // TODO: Actually use the failed-deduction info? | ||||
11651 | FailedCandidates.addCandidate() | ||||
11652 | .set(I.getPair(), FunctionTemplate->getTemplatedDecl(), | ||||
11653 | MakeDeductionFailureInfo(Context, Result, Info)); | ||||
11654 | continue; | ||||
11655 | } | ||||
11656 | |||||
11657 | assert(Specialization && "no specialization and no error?")((Specialization && "no specialization and no error?" ) ? static_cast<void> (0) : __assert_fail ("Specialization && \"no specialization and no error?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11657, __PRETTY_FUNCTION__)); | ||||
11658 | |||||
11659 | // Multiple matches; we can't resolve to a single declaration. | ||||
11660 | if (Matched) { | ||||
11661 | if (Complain) { | ||||
11662 | Diag(ovl->getExprLoc(), diag::err_addr_ovl_ambiguous) | ||||
11663 | << ovl->getName(); | ||||
11664 | NoteAllOverloadCandidates(ovl); | ||||
11665 | } | ||||
11666 | return nullptr; | ||||
11667 | } | ||||
11668 | |||||
11669 | Matched = Specialization; | ||||
11670 | if (FoundResult) *FoundResult = I.getPair(); | ||||
11671 | } | ||||
11672 | |||||
11673 | if (Matched && | ||||
11674 | completeFunctionType(*this, Matched, ovl->getExprLoc(), Complain)) | ||||
11675 | return nullptr; | ||||
11676 | |||||
11677 | return Matched; | ||||
11678 | } | ||||
11679 | |||||
11680 | // Resolve and fix an overloaded expression that can be resolved | ||||
11681 | // because it identifies a single function template specialization. | ||||
11682 | // | ||||
11683 | // Last three arguments should only be supplied if Complain = true | ||||
11684 | // | ||||
11685 | // Return true if it was logically possible to so resolve the | ||||
11686 | // expression, regardless of whether or not it succeeded. Always | ||||
11687 | // returns true if 'complain' is set. | ||||
11688 | bool Sema::ResolveAndFixSingleFunctionTemplateSpecialization( | ||||
11689 | ExprResult &SrcExpr, bool doFunctionPointerConverion, | ||||
11690 | bool complain, SourceRange OpRangeForComplaining, | ||||
11691 | QualType DestTypeForComplaining, | ||||
11692 | unsigned DiagIDForComplaining) { | ||||
11693 | assert(SrcExpr.get()->getType() == Context.OverloadTy)((SrcExpr.get()->getType() == Context.OverloadTy) ? static_cast <void> (0) : __assert_fail ("SrcExpr.get()->getType() == Context.OverloadTy" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11693, __PRETTY_FUNCTION__)); | ||||
11694 | |||||
11695 | OverloadExpr::FindResult ovl = OverloadExpr::find(SrcExpr.get()); | ||||
11696 | |||||
11697 | DeclAccessPair found; | ||||
11698 | ExprResult SingleFunctionExpression; | ||||
11699 | if (FunctionDecl *fn = ResolveSingleFunctionTemplateSpecialization( | ||||
11700 | ovl.Expression, /*complain*/ false, &found)) { | ||||
11701 | if (DiagnoseUseOfDecl(fn, SrcExpr.get()->getBeginLoc())) { | ||||
11702 | SrcExpr = ExprError(); | ||||
11703 | return true; | ||||
11704 | } | ||||
11705 | |||||
11706 | // It is only correct to resolve to an instance method if we're | ||||
11707 | // resolving a form that's permitted to be a pointer to member. | ||||
11708 | // Otherwise we'll end up making a bound member expression, which | ||||
11709 | // is illegal in all the contexts we resolve like this. | ||||
11710 | if (!ovl.HasFormOfMemberPointer && | ||||
11711 | isa<CXXMethodDecl>(fn) && | ||||
11712 | cast<CXXMethodDecl>(fn)->isInstance()) { | ||||
11713 | if (!complain) return false; | ||||
11714 | |||||
11715 | Diag(ovl.Expression->getExprLoc(), | ||||
11716 | diag::err_bound_member_function) | ||||
11717 | << 0 << ovl.Expression->getSourceRange(); | ||||
11718 | |||||
11719 | // TODO: I believe we only end up here if there's a mix of | ||||
11720 | // static and non-static candidates (otherwise the expression | ||||
11721 | // would have 'bound member' type, not 'overload' type). | ||||
11722 | // Ideally we would note which candidate was chosen and why | ||||
11723 | // the static candidates were rejected. | ||||
11724 | SrcExpr = ExprError(); | ||||
11725 | return true; | ||||
11726 | } | ||||
11727 | |||||
11728 | // Fix the expression to refer to 'fn'. | ||||
11729 | SingleFunctionExpression = | ||||
11730 | FixOverloadedFunctionReference(SrcExpr.get(), found, fn); | ||||
11731 | |||||
11732 | // If desired, do function-to-pointer decay. | ||||
11733 | if (doFunctionPointerConverion) { | ||||
11734 | SingleFunctionExpression = | ||||
11735 | DefaultFunctionArrayLvalueConversion(SingleFunctionExpression.get()); | ||||
11736 | if (SingleFunctionExpression.isInvalid()) { | ||||
11737 | SrcExpr = ExprError(); | ||||
11738 | return true; | ||||
11739 | } | ||||
11740 | } | ||||
11741 | } | ||||
11742 | |||||
11743 | if (!SingleFunctionExpression.isUsable()) { | ||||
11744 | if (complain) { | ||||
11745 | Diag(OpRangeForComplaining.getBegin(), DiagIDForComplaining) | ||||
11746 | << ovl.Expression->getName() | ||||
11747 | << DestTypeForComplaining | ||||
11748 | << OpRangeForComplaining | ||||
11749 | << ovl.Expression->getQualifierLoc().getSourceRange(); | ||||
11750 | NoteAllOverloadCandidates(SrcExpr.get()); | ||||
11751 | |||||
11752 | SrcExpr = ExprError(); | ||||
11753 | return true; | ||||
11754 | } | ||||
11755 | |||||
11756 | return false; | ||||
11757 | } | ||||
11758 | |||||
11759 | SrcExpr = SingleFunctionExpression; | ||||
11760 | return true; | ||||
11761 | } | ||||
11762 | |||||
11763 | /// Add a single candidate to the overload set. | ||||
11764 | static void AddOverloadedCallCandidate(Sema &S, | ||||
11765 | DeclAccessPair FoundDecl, | ||||
11766 | TemplateArgumentListInfo *ExplicitTemplateArgs, | ||||
11767 | ArrayRef<Expr *> Args, | ||||
11768 | OverloadCandidateSet &CandidateSet, | ||||
11769 | bool PartialOverloading, | ||||
11770 | bool KnownValid) { | ||||
11771 | NamedDecl *Callee = FoundDecl.getDecl(); | ||||
11772 | if (isa<UsingShadowDecl>(Callee)) | ||||
11773 | Callee = cast<UsingShadowDecl>(Callee)->getTargetDecl(); | ||||
11774 | |||||
11775 | if (FunctionDecl *Func = dyn_cast<FunctionDecl>(Callee)) { | ||||
11776 | if (ExplicitTemplateArgs) { | ||||
11777 | assert(!KnownValid && "Explicit template arguments?")((!KnownValid && "Explicit template arguments?") ? static_cast <void> (0) : __assert_fail ("!KnownValid && \"Explicit template arguments?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11777, __PRETTY_FUNCTION__)); | ||||
11778 | return; | ||||
11779 | } | ||||
11780 | // Prevent ill-formed function decls to be added as overload candidates. | ||||
11781 | if (!dyn_cast<FunctionProtoType>(Func->getType()->getAs<FunctionType>())) | ||||
11782 | return; | ||||
11783 | |||||
11784 | S.AddOverloadCandidate(Func, FoundDecl, Args, CandidateSet, | ||||
11785 | /*SuppressUserConversions=*/false, | ||||
11786 | PartialOverloading); | ||||
11787 | return; | ||||
11788 | } | ||||
11789 | |||||
11790 | if (FunctionTemplateDecl *FuncTemplate | ||||
11791 | = dyn_cast<FunctionTemplateDecl>(Callee)) { | ||||
11792 | S.AddTemplateOverloadCandidate(FuncTemplate, FoundDecl, | ||||
11793 | ExplicitTemplateArgs, Args, CandidateSet, | ||||
11794 | /*SuppressUserConversions=*/false, | ||||
11795 | PartialOverloading); | ||||
11796 | return; | ||||
11797 | } | ||||
11798 | |||||
11799 | assert(!KnownValid && "unhandled case in overloaded call candidate")((!KnownValid && "unhandled case in overloaded call candidate" ) ? static_cast<void> (0) : __assert_fail ("!KnownValid && \"unhandled case in overloaded call candidate\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11799, __PRETTY_FUNCTION__)); | ||||
11800 | } | ||||
11801 | |||||
11802 | /// Add the overload candidates named by callee and/or found by argument | ||||
11803 | /// dependent lookup to the given overload set. | ||||
11804 | void Sema::AddOverloadedCallCandidates(UnresolvedLookupExpr *ULE, | ||||
11805 | ArrayRef<Expr *> Args, | ||||
11806 | OverloadCandidateSet &CandidateSet, | ||||
11807 | bool PartialOverloading) { | ||||
11808 | |||||
11809 | #ifndef NDEBUG | ||||
11810 | // Verify that ArgumentDependentLookup is consistent with the rules | ||||
11811 | // in C++0x [basic.lookup.argdep]p3: | ||||
11812 | // | ||||
11813 | // Let X be the lookup set produced by unqualified lookup (3.4.1) | ||||
11814 | // and let Y be the lookup set produced by argument dependent | ||||
11815 | // lookup (defined as follows). If X contains | ||||
11816 | // | ||||
11817 | // -- a declaration of a class member, or | ||||
11818 | // | ||||
11819 | // -- a block-scope function declaration that is not a | ||||
11820 | // using-declaration, or | ||||
11821 | // | ||||
11822 | // -- a declaration that is neither a function or a function | ||||
11823 | // template | ||||
11824 | // | ||||
11825 | // then Y is empty. | ||||
11826 | |||||
11827 | if (ULE->requiresADL()) { | ||||
11828 | for (UnresolvedLookupExpr::decls_iterator I = ULE->decls_begin(), | ||||
11829 | E = ULE->decls_end(); I != E; ++I) { | ||||
11830 | assert(!(*I)->getDeclContext()->isRecord())((!(*I)->getDeclContext()->isRecord()) ? static_cast< void> (0) : __assert_fail ("!(*I)->getDeclContext()->isRecord()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11830, __PRETTY_FUNCTION__)); | ||||
11831 | assert(isa<UsingShadowDecl>(*I) ||((isa<UsingShadowDecl>(*I) || !(*I)->getDeclContext( )->isFunctionOrMethod()) ? static_cast<void> (0) : __assert_fail ("isa<UsingShadowDecl>(*I) || !(*I)->getDeclContext()->isFunctionOrMethod()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11832, __PRETTY_FUNCTION__)) | ||||
11832 | !(*I)->getDeclContext()->isFunctionOrMethod())((isa<UsingShadowDecl>(*I) || !(*I)->getDeclContext( )->isFunctionOrMethod()) ? static_cast<void> (0) : __assert_fail ("isa<UsingShadowDecl>(*I) || !(*I)->getDeclContext()->isFunctionOrMethod()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11832, __PRETTY_FUNCTION__)); | ||||
11833 | assert((*I)->getUnderlyingDecl()->isFunctionOrFunctionTemplate())(((*I)->getUnderlyingDecl()->isFunctionOrFunctionTemplate ()) ? static_cast<void> (0) : __assert_fail ("(*I)->getUnderlyingDecl()->isFunctionOrFunctionTemplate()" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11833, __PRETTY_FUNCTION__)); | ||||
11834 | } | ||||
11835 | } | ||||
11836 | #endif | ||||
11837 | |||||
11838 | // It would be nice to avoid this copy. | ||||
11839 | TemplateArgumentListInfo TABuffer; | ||||
11840 | TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr; | ||||
11841 | if (ULE->hasExplicitTemplateArgs()) { | ||||
11842 | ULE->copyTemplateArgumentsInto(TABuffer); | ||||
11843 | ExplicitTemplateArgs = &TABuffer; | ||||
11844 | } | ||||
11845 | |||||
11846 | for (UnresolvedLookupExpr::decls_iterator I = ULE->decls_begin(), | ||||
11847 | E = ULE->decls_end(); I != E; ++I) | ||||
11848 | AddOverloadedCallCandidate(*this, I.getPair(), ExplicitTemplateArgs, Args, | ||||
11849 | CandidateSet, PartialOverloading, | ||||
11850 | /*KnownValid*/ true); | ||||
11851 | |||||
11852 | if (ULE->requiresADL()) | ||||
11853 | AddArgumentDependentLookupCandidates(ULE->getName(), ULE->getExprLoc(), | ||||
11854 | Args, ExplicitTemplateArgs, | ||||
11855 | CandidateSet, PartialOverloading); | ||||
11856 | } | ||||
11857 | |||||
11858 | /// Determine whether a declaration with the specified name could be moved into | ||||
11859 | /// a different namespace. | ||||
11860 | static bool canBeDeclaredInNamespace(const DeclarationName &Name) { | ||||
11861 | switch (Name.getCXXOverloadedOperator()) { | ||||
11862 | case OO_New: case OO_Array_New: | ||||
11863 | case OO_Delete: case OO_Array_Delete: | ||||
11864 | return false; | ||||
11865 | |||||
11866 | default: | ||||
11867 | return true; | ||||
11868 | } | ||||
11869 | } | ||||
11870 | |||||
11871 | /// Attempt to recover from an ill-formed use of a non-dependent name in a | ||||
11872 | /// template, where the non-dependent name was declared after the template | ||||
11873 | /// was defined. This is common in code written for a compilers which do not | ||||
11874 | /// correctly implement two-stage name lookup. | ||||
11875 | /// | ||||
11876 | /// Returns true if a viable candidate was found and a diagnostic was issued. | ||||
11877 | static bool | ||||
11878 | DiagnoseTwoPhaseLookup(Sema &SemaRef, SourceLocation FnLoc, | ||||
11879 | const CXXScopeSpec &SS, LookupResult &R, | ||||
11880 | OverloadCandidateSet::CandidateSetKind CSK, | ||||
11881 | TemplateArgumentListInfo *ExplicitTemplateArgs, | ||||
11882 | ArrayRef<Expr *> Args, | ||||
11883 | bool *DoDiagnoseEmptyLookup = nullptr) { | ||||
11884 | if (!SemaRef.inTemplateInstantiation() || !SS.isEmpty()) | ||||
11885 | return false; | ||||
11886 | |||||
11887 | for (DeclContext *DC = SemaRef.CurContext; DC; DC = DC->getParent()) { | ||||
11888 | if (DC->isTransparentContext()) | ||||
11889 | continue; | ||||
11890 | |||||
11891 | SemaRef.LookupQualifiedName(R, DC); | ||||
11892 | |||||
11893 | if (!R.empty()) { | ||||
11894 | R.suppressDiagnostics(); | ||||
11895 | |||||
11896 | if (isa<CXXRecordDecl>(DC)) { | ||||
11897 | // Don't diagnose names we find in classes; we get much better | ||||
11898 | // diagnostics for these from DiagnoseEmptyLookup. | ||||
11899 | R.clear(); | ||||
11900 | if (DoDiagnoseEmptyLookup) | ||||
11901 | *DoDiagnoseEmptyLookup = true; | ||||
11902 | return false; | ||||
11903 | } | ||||
11904 | |||||
11905 | OverloadCandidateSet Candidates(FnLoc, CSK); | ||||
11906 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) | ||||
11907 | AddOverloadedCallCandidate(SemaRef, I.getPair(), | ||||
11908 | ExplicitTemplateArgs, Args, | ||||
11909 | Candidates, false, /*KnownValid*/ false); | ||||
11910 | |||||
11911 | OverloadCandidateSet::iterator Best; | ||||
11912 | if (Candidates.BestViableFunction(SemaRef, FnLoc, Best) != OR_Success) { | ||||
11913 | // No viable functions. Don't bother the user with notes for functions | ||||
11914 | // which don't work and shouldn't be found anyway. | ||||
11915 | R.clear(); | ||||
11916 | return false; | ||||
11917 | } | ||||
11918 | |||||
11919 | // Find the namespaces where ADL would have looked, and suggest | ||||
11920 | // declaring the function there instead. | ||||
11921 | Sema::AssociatedNamespaceSet AssociatedNamespaces; | ||||
11922 | Sema::AssociatedClassSet AssociatedClasses; | ||||
11923 | SemaRef.FindAssociatedClassesAndNamespaces(FnLoc, Args, | ||||
11924 | AssociatedNamespaces, | ||||
11925 | AssociatedClasses); | ||||
11926 | Sema::AssociatedNamespaceSet SuggestedNamespaces; | ||||
11927 | if (canBeDeclaredInNamespace(R.getLookupName())) { | ||||
11928 | DeclContext *Std = SemaRef.getStdNamespace(); | ||||
11929 | for (Sema::AssociatedNamespaceSet::iterator | ||||
11930 | it = AssociatedNamespaces.begin(), | ||||
11931 | end = AssociatedNamespaces.end(); it != end; ++it) { | ||||
11932 | // Never suggest declaring a function within namespace 'std'. | ||||
11933 | if (Std && Std->Encloses(*it)) | ||||
11934 | continue; | ||||
11935 | |||||
11936 | // Never suggest declaring a function within a namespace with a | ||||
11937 | // reserved name, like __gnu_cxx. | ||||
11938 | NamespaceDecl *NS = dyn_cast<NamespaceDecl>(*it); | ||||
11939 | if (NS && | ||||
11940 | NS->getQualifiedNameAsString().find("__") != std::string::npos) | ||||
11941 | continue; | ||||
11942 | |||||
11943 | SuggestedNamespaces.insert(*it); | ||||
11944 | } | ||||
11945 | } | ||||
11946 | |||||
11947 | SemaRef.Diag(R.getNameLoc(), diag::err_not_found_by_two_phase_lookup) | ||||
11948 | << R.getLookupName(); | ||||
11949 | if (SuggestedNamespaces.empty()) { | ||||
11950 | SemaRef.Diag(Best->Function->getLocation(), | ||||
11951 | diag::note_not_found_by_two_phase_lookup) | ||||
11952 | << R.getLookupName() << 0; | ||||
11953 | } else if (SuggestedNamespaces.size() == 1) { | ||||
11954 | SemaRef.Diag(Best->Function->getLocation(), | ||||
11955 | diag::note_not_found_by_two_phase_lookup) | ||||
11956 | << R.getLookupName() << 1 << *SuggestedNamespaces.begin(); | ||||
11957 | } else { | ||||
11958 | // FIXME: It would be useful to list the associated namespaces here, | ||||
11959 | // but the diagnostics infrastructure doesn't provide a way to produce | ||||
11960 | // a localized representation of a list of items. | ||||
11961 | SemaRef.Diag(Best->Function->getLocation(), | ||||
11962 | diag::note_not_found_by_two_phase_lookup) | ||||
11963 | << R.getLookupName() << 2; | ||||
11964 | } | ||||
11965 | |||||
11966 | // Try to recover by calling this function. | ||||
11967 | return true; | ||||
11968 | } | ||||
11969 | |||||
11970 | R.clear(); | ||||
11971 | } | ||||
11972 | |||||
11973 | return false; | ||||
11974 | } | ||||
11975 | |||||
11976 | /// Attempt to recover from ill-formed use of a non-dependent operator in a | ||||
11977 | /// template, where the non-dependent operator was declared after the template | ||||
11978 | /// was defined. | ||||
11979 | /// | ||||
11980 | /// Returns true if a viable candidate was found and a diagnostic was issued. | ||||
11981 | static bool | ||||
11982 | DiagnoseTwoPhaseOperatorLookup(Sema &SemaRef, OverloadedOperatorKind Op, | ||||
11983 | SourceLocation OpLoc, | ||||
11984 | ArrayRef<Expr *> Args) { | ||||
11985 | DeclarationName OpName = | ||||
11986 | SemaRef.Context.DeclarationNames.getCXXOperatorName(Op); | ||||
11987 | LookupResult R(SemaRef, OpName, OpLoc, Sema::LookupOperatorName); | ||||
11988 | return DiagnoseTwoPhaseLookup(SemaRef, OpLoc, CXXScopeSpec(), R, | ||||
11989 | OverloadCandidateSet::CSK_Operator, | ||||
11990 | /*ExplicitTemplateArgs=*/nullptr, Args); | ||||
11991 | } | ||||
11992 | |||||
11993 | namespace { | ||||
11994 | class BuildRecoveryCallExprRAII { | ||||
11995 | Sema &SemaRef; | ||||
11996 | public: | ||||
11997 | BuildRecoveryCallExprRAII(Sema &S) : SemaRef(S) { | ||||
11998 | assert(SemaRef.IsBuildingRecoveryCallExpr == false)((SemaRef.IsBuildingRecoveryCallExpr == false) ? static_cast< void> (0) : __assert_fail ("SemaRef.IsBuildingRecoveryCallExpr == false" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 11998, __PRETTY_FUNCTION__)); | ||||
11999 | SemaRef.IsBuildingRecoveryCallExpr = true; | ||||
12000 | } | ||||
12001 | |||||
12002 | ~BuildRecoveryCallExprRAII() { | ||||
12003 | SemaRef.IsBuildingRecoveryCallExpr = false; | ||||
12004 | } | ||||
12005 | }; | ||||
12006 | |||||
12007 | } | ||||
12008 | |||||
12009 | /// Attempts to recover from a call where no functions were found. | ||||
12010 | /// | ||||
12011 | /// Returns true if new candidates were found. | ||||
12012 | static ExprResult | ||||
12013 | BuildRecoveryCallExpr(Sema &SemaRef, Scope *S, Expr *Fn, | ||||
12014 | UnresolvedLookupExpr *ULE, | ||||
12015 | SourceLocation LParenLoc, | ||||
12016 | MutableArrayRef<Expr *> Args, | ||||
12017 | SourceLocation RParenLoc, | ||||
12018 | bool EmptyLookup, bool AllowTypoCorrection) { | ||||
12019 | // Do not try to recover if it is already building a recovery call. | ||||
12020 | // This stops infinite loops for template instantiations like | ||||
12021 | // | ||||
12022 | // template <typename T> auto foo(T t) -> decltype(foo(t)) {} | ||||
12023 | // template <typename T> auto foo(T t) -> decltype(foo(&t)) {} | ||||
12024 | // | ||||
12025 | if (SemaRef.IsBuildingRecoveryCallExpr) | ||||
12026 | return ExprError(); | ||||
12027 | BuildRecoveryCallExprRAII RCE(SemaRef); | ||||
12028 | |||||
12029 | CXXScopeSpec SS; | ||||
12030 | SS.Adopt(ULE->getQualifierLoc()); | ||||
12031 | SourceLocation TemplateKWLoc = ULE->getTemplateKeywordLoc(); | ||||
12032 | |||||
12033 | TemplateArgumentListInfo TABuffer; | ||||
12034 | TemplateArgumentListInfo *ExplicitTemplateArgs = nullptr; | ||||
12035 | if (ULE->hasExplicitTemplateArgs()) { | ||||
12036 | ULE->copyTemplateArgumentsInto(TABuffer); | ||||
12037 | ExplicitTemplateArgs = &TABuffer; | ||||
12038 | } | ||||
12039 | |||||
12040 | LookupResult R(SemaRef, ULE->getName(), ULE->getNameLoc(), | ||||
12041 | Sema::LookupOrdinaryName); | ||||
12042 | bool DoDiagnoseEmptyLookup = EmptyLookup; | ||||
12043 | if (!DiagnoseTwoPhaseLookup( | ||||
12044 | SemaRef, Fn->getExprLoc(), SS, R, OverloadCandidateSet::CSK_Normal, | ||||
12045 | ExplicitTemplateArgs, Args, &DoDiagnoseEmptyLookup)) { | ||||
12046 | NoTypoCorrectionCCC NoTypoValidator{}; | ||||
12047 | FunctionCallFilterCCC FunctionCallValidator(SemaRef, Args.size(), | ||||
12048 | ExplicitTemplateArgs != nullptr, | ||||
12049 | dyn_cast<MemberExpr>(Fn)); | ||||
12050 | CorrectionCandidateCallback &Validator = | ||||
12051 | AllowTypoCorrection | ||||
12052 | ? static_cast<CorrectionCandidateCallback &>(FunctionCallValidator) | ||||
12053 | : static_cast<CorrectionCandidateCallback &>(NoTypoValidator); | ||||
12054 | if (!DoDiagnoseEmptyLookup || | ||||
12055 | SemaRef.DiagnoseEmptyLookup(S, SS, R, Validator, ExplicitTemplateArgs, | ||||
12056 | Args)) | ||||
12057 | return ExprError(); | ||||
12058 | } | ||||
12059 | |||||
12060 | assert(!R.empty() && "lookup results empty despite recovery")((!R.empty() && "lookup results empty despite recovery" ) ? static_cast<void> (0) : __assert_fail ("!R.empty() && \"lookup results empty despite recovery\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12060, __PRETTY_FUNCTION__)); | ||||
12061 | |||||
12062 | // If recovery created an ambiguity, just bail out. | ||||
12063 | if (R.isAmbiguous()) { | ||||
12064 | R.suppressDiagnostics(); | ||||
12065 | return ExprError(); | ||||
12066 | } | ||||
12067 | |||||
12068 | // Build an implicit member call if appropriate. Just drop the | ||||
12069 | // casts and such from the call, we don't really care. | ||||
12070 | ExprResult NewFn = ExprError(); | ||||
12071 | if ((*R.begin())->isCXXClassMember()) | ||||
12072 | NewFn = SemaRef.BuildPossibleImplicitMemberExpr(SS, TemplateKWLoc, R, | ||||
12073 | ExplicitTemplateArgs, S); | ||||
12074 | else if (ExplicitTemplateArgs || TemplateKWLoc.isValid()) | ||||
12075 | NewFn = SemaRef.BuildTemplateIdExpr(SS, TemplateKWLoc, R, false, | ||||
12076 | ExplicitTemplateArgs); | ||||
12077 | else | ||||
12078 | NewFn = SemaRef.BuildDeclarationNameExpr(SS, R, false); | ||||
12079 | |||||
12080 | if (NewFn.isInvalid()) | ||||
12081 | return ExprError(); | ||||
12082 | |||||
12083 | // This shouldn't cause an infinite loop because we're giving it | ||||
12084 | // an expression with viable lookup results, which should never | ||||
12085 | // end up here. | ||||
12086 | return SemaRef.BuildCallExpr(/*Scope*/ nullptr, NewFn.get(), LParenLoc, | ||||
12087 | MultiExprArg(Args.data(), Args.size()), | ||||
12088 | RParenLoc); | ||||
12089 | } | ||||
12090 | |||||
12091 | /// Constructs and populates an OverloadedCandidateSet from | ||||
12092 | /// the given function. | ||||
12093 | /// \returns true when an the ExprResult output parameter has been set. | ||||
12094 | bool Sema::buildOverloadedCallSet(Scope *S, Expr *Fn, | ||||
12095 | UnresolvedLookupExpr *ULE, | ||||
12096 | MultiExprArg Args, | ||||
12097 | SourceLocation RParenLoc, | ||||
12098 | OverloadCandidateSet *CandidateSet, | ||||
12099 | ExprResult *Result) { | ||||
12100 | #ifndef NDEBUG | ||||
12101 | if (ULE->requiresADL()) { | ||||
12102 | // To do ADL, we must have found an unqualified name. | ||||
12103 | assert(!ULE->getQualifier() && "qualified name with ADL")((!ULE->getQualifier() && "qualified name with ADL" ) ? static_cast<void> (0) : __assert_fail ("!ULE->getQualifier() && \"qualified name with ADL\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12103, __PRETTY_FUNCTION__)); | ||||
12104 | |||||
12105 | // We don't perform ADL for implicit declarations of builtins. | ||||
12106 | // Verify that this was correctly set up. | ||||
12107 | FunctionDecl *F; | ||||
12108 | if (ULE->decls_begin() != ULE->decls_end() && | ||||
12109 | ULE->decls_begin() + 1 == ULE->decls_end() && | ||||
12110 | (F = dyn_cast<FunctionDecl>(*ULE->decls_begin())) && | ||||
12111 | F->getBuiltinID() && F->isImplicit()) | ||||
12112 | llvm_unreachable("performing ADL for builtin")::llvm::llvm_unreachable_internal("performing ADL for builtin" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12112); | ||||
12113 | |||||
12114 | // We don't perform ADL in C. | ||||
12115 | assert(getLangOpts().CPlusPlus && "ADL enabled in C")((getLangOpts().CPlusPlus && "ADL enabled in C") ? static_cast <void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"ADL enabled in C\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12115, __PRETTY_FUNCTION__)); | ||||
12116 | } | ||||
12117 | #endif | ||||
12118 | |||||
12119 | UnbridgedCastsSet UnbridgedCasts; | ||||
12120 | if (checkArgPlaceholdersForOverload(*this, Args, UnbridgedCasts)) { | ||||
12121 | *Result = ExprError(); | ||||
12122 | return true; | ||||
12123 | } | ||||
12124 | |||||
12125 | // Add the functions denoted by the callee to the set of candidate | ||||
12126 | // functions, including those from argument-dependent lookup. | ||||
12127 | AddOverloadedCallCandidates(ULE, Args, *CandidateSet); | ||||
12128 | |||||
12129 | if (getLangOpts().MSVCCompat && | ||||
12130 | CurContext->isDependentContext() && !isSFINAEContext() && | ||||
12131 | (isa<FunctionDecl>(CurContext) || isa<CXXRecordDecl>(CurContext))) { | ||||
12132 | |||||
12133 | OverloadCandidateSet::iterator Best; | ||||
12134 | if (CandidateSet->empty() || | ||||
12135 | CandidateSet->BestViableFunction(*this, Fn->getBeginLoc(), Best) == | ||||
12136 | OR_No_Viable_Function) { | ||||
12137 | // In Microsoft mode, if we are inside a template class member function | ||||
12138 | // then create a type dependent CallExpr. The goal is to postpone name | ||||
12139 | // lookup to instantiation time to be able to search into type dependent | ||||
12140 | // base classes. | ||||
12141 | CallExpr *CE = CallExpr::Create(Context, Fn, Args, Context.DependentTy, | ||||
12142 | VK_RValue, RParenLoc); | ||||
12143 | CE->setTypeDependent(true); | ||||
12144 | CE->setValueDependent(true); | ||||
12145 | CE->setInstantiationDependent(true); | ||||
12146 | *Result = CE; | ||||
12147 | return true; | ||||
12148 | } | ||||
12149 | } | ||||
12150 | |||||
12151 | if (CandidateSet->empty()) | ||||
12152 | return false; | ||||
12153 | |||||
12154 | UnbridgedCasts.restore(); | ||||
12155 | return false; | ||||
12156 | } | ||||
12157 | |||||
12158 | /// FinishOverloadedCallExpr - given an OverloadCandidateSet, builds and returns | ||||
12159 | /// the completed call expression. If overload resolution fails, emits | ||||
12160 | /// diagnostics and returns ExprError() | ||||
12161 | static ExprResult FinishOverloadedCallExpr(Sema &SemaRef, Scope *S, Expr *Fn, | ||||
12162 | UnresolvedLookupExpr *ULE, | ||||
12163 | SourceLocation LParenLoc, | ||||
12164 | MultiExprArg Args, | ||||
12165 | SourceLocation RParenLoc, | ||||
12166 | Expr *ExecConfig, | ||||
12167 | OverloadCandidateSet *CandidateSet, | ||||
12168 | OverloadCandidateSet::iterator *Best, | ||||
12169 | OverloadingResult OverloadResult, | ||||
12170 | bool AllowTypoCorrection) { | ||||
12171 | if (CandidateSet->empty()) | ||||
12172 | return BuildRecoveryCallExpr(SemaRef, S, Fn, ULE, LParenLoc, Args, | ||||
12173 | RParenLoc, /*EmptyLookup=*/true, | ||||
12174 | AllowTypoCorrection); | ||||
12175 | |||||
12176 | switch (OverloadResult) { | ||||
12177 | case OR_Success: { | ||||
12178 | FunctionDecl *FDecl = (*Best)->Function; | ||||
12179 | SemaRef.CheckUnresolvedLookupAccess(ULE, (*Best)->FoundDecl); | ||||
12180 | if (SemaRef.DiagnoseUseOfDecl(FDecl, ULE->getNameLoc())) | ||||
12181 | return ExprError(); | ||||
12182 | Fn = SemaRef.FixOverloadedFunctionReference(Fn, (*Best)->FoundDecl, FDecl); | ||||
12183 | return SemaRef.BuildResolvedCallExpr(Fn, FDecl, LParenLoc, Args, RParenLoc, | ||||
12184 | ExecConfig, /*IsExecConfig=*/false, | ||||
12185 | (*Best)->IsADLCandidate); | ||||
12186 | } | ||||
12187 | |||||
12188 | case OR_No_Viable_Function: { | ||||
12189 | // Try to recover by looking for viable functions which the user might | ||||
12190 | // have meant to call. | ||||
12191 | ExprResult Recovery = BuildRecoveryCallExpr(SemaRef, S, Fn, ULE, LParenLoc, | ||||
12192 | Args, RParenLoc, | ||||
12193 | /*EmptyLookup=*/false, | ||||
12194 | AllowTypoCorrection); | ||||
12195 | if (!Recovery.isInvalid()) | ||||
12196 | return Recovery; | ||||
12197 | |||||
12198 | // If the user passes in a function that we can't take the address of, we | ||||
12199 | // generally end up emitting really bad error messages. Here, we attempt to | ||||
12200 | // emit better ones. | ||||
12201 | for (const Expr *Arg : Args) { | ||||
12202 | if (!Arg->getType()->isFunctionType()) | ||||
12203 | continue; | ||||
12204 | if (auto *DRE = dyn_cast<DeclRefExpr>(Arg->IgnoreParenImpCasts())) { | ||||
12205 | auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl()); | ||||
12206 | if (FD && | ||||
12207 | !SemaRef.checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true, | ||||
12208 | Arg->getExprLoc())) | ||||
12209 | return ExprError(); | ||||
12210 | } | ||||
12211 | } | ||||
12212 | |||||
12213 | CandidateSet->NoteCandidates( | ||||
12214 | PartialDiagnosticAt( | ||||
12215 | Fn->getBeginLoc(), | ||||
12216 | SemaRef.PDiag(diag::err_ovl_no_viable_function_in_call) | ||||
12217 | << ULE->getName() << Fn->getSourceRange()), | ||||
12218 | SemaRef, OCD_AllCandidates, Args); | ||||
12219 | break; | ||||
12220 | } | ||||
12221 | |||||
12222 | case OR_Ambiguous: | ||||
12223 | CandidateSet->NoteCandidates( | ||||
12224 | PartialDiagnosticAt(Fn->getBeginLoc(), | ||||
12225 | SemaRef.PDiag(diag::err_ovl_ambiguous_call) | ||||
12226 | << ULE->getName() << Fn->getSourceRange()), | ||||
12227 | SemaRef, OCD_ViableCandidates, Args); | ||||
12228 | break; | ||||
12229 | |||||
12230 | case OR_Deleted: { | ||||
12231 | CandidateSet->NoteCandidates( | ||||
12232 | PartialDiagnosticAt(Fn->getBeginLoc(), | ||||
12233 | SemaRef.PDiag(diag::err_ovl_deleted_call) | ||||
12234 | << ULE->getName() << Fn->getSourceRange()), | ||||
12235 | SemaRef, OCD_AllCandidates, Args); | ||||
12236 | |||||
12237 | // We emitted an error for the unavailable/deleted function call but keep | ||||
12238 | // the call in the AST. | ||||
12239 | FunctionDecl *FDecl = (*Best)->Function; | ||||
12240 | Fn = SemaRef.FixOverloadedFunctionReference(Fn, (*Best)->FoundDecl, FDecl); | ||||
12241 | return SemaRef.BuildResolvedCallExpr(Fn, FDecl, LParenLoc, Args, RParenLoc, | ||||
12242 | ExecConfig, /*IsExecConfig=*/false, | ||||
12243 | (*Best)->IsADLCandidate); | ||||
12244 | } | ||||
12245 | } | ||||
12246 | |||||
12247 | // Overload resolution failed. | ||||
12248 | return ExprError(); | ||||
12249 | } | ||||
12250 | |||||
12251 | static void markUnaddressableCandidatesUnviable(Sema &S, | ||||
12252 | OverloadCandidateSet &CS) { | ||||
12253 | for (auto I = CS.begin(), E = CS.end(); I != E; ++I) { | ||||
12254 | if (I->Viable && | ||||
12255 | !S.checkAddressOfFunctionIsAvailable(I->Function, /*Complain=*/false)) { | ||||
12256 | I->Viable = false; | ||||
12257 | I->FailureKind = ovl_fail_addr_not_available; | ||||
12258 | } | ||||
12259 | } | ||||
12260 | } | ||||
12261 | |||||
12262 | /// BuildOverloadedCallExpr - Given the call expression that calls Fn | ||||
12263 | /// (which eventually refers to the declaration Func) and the call | ||||
12264 | /// arguments Args/NumArgs, attempt to resolve the function call down | ||||
12265 | /// to a specific function. If overload resolution succeeds, returns | ||||
12266 | /// the call expression produced by overload resolution. | ||||
12267 | /// Otherwise, emits diagnostics and returns ExprError. | ||||
12268 | ExprResult Sema::BuildOverloadedCallExpr(Scope *S, Expr *Fn, | ||||
12269 | UnresolvedLookupExpr *ULE, | ||||
12270 | SourceLocation LParenLoc, | ||||
12271 | MultiExprArg Args, | ||||
12272 | SourceLocation RParenLoc, | ||||
12273 | Expr *ExecConfig, | ||||
12274 | bool AllowTypoCorrection, | ||||
12275 | bool CalleesAddressIsTaken) { | ||||
12276 | OverloadCandidateSet CandidateSet(Fn->getExprLoc(), | ||||
12277 | OverloadCandidateSet::CSK_Normal); | ||||
12278 | ExprResult result; | ||||
12279 | |||||
12280 | if (buildOverloadedCallSet(S, Fn, ULE, Args, LParenLoc, &CandidateSet, | ||||
12281 | &result)) | ||||
12282 | return result; | ||||
12283 | |||||
12284 | // If the user handed us something like `(&Foo)(Bar)`, we need to ensure that | ||||
12285 | // functions that aren't addressible are considered unviable. | ||||
12286 | if (CalleesAddressIsTaken) | ||||
12287 | markUnaddressableCandidatesUnviable(*this, CandidateSet); | ||||
12288 | |||||
12289 | OverloadCandidateSet::iterator Best; | ||||
12290 | OverloadingResult OverloadResult = | ||||
12291 | CandidateSet.BestViableFunction(*this, Fn->getBeginLoc(), Best); | ||||
12292 | |||||
12293 | return FinishOverloadedCallExpr(*this, S, Fn, ULE, LParenLoc, Args, RParenLoc, | ||||
12294 | ExecConfig, &CandidateSet, &Best, | ||||
12295 | OverloadResult, AllowTypoCorrection); | ||||
12296 | } | ||||
12297 | |||||
12298 | static bool IsOverloaded(const UnresolvedSetImpl &Functions) { | ||||
12299 | return Functions.size() > 1 || | ||||
12300 | (Functions.size() == 1 && isa<FunctionTemplateDecl>(*Functions.begin())); | ||||
12301 | } | ||||
12302 | |||||
12303 | /// Create a unary operation that may resolve to an overloaded | ||||
12304 | /// operator. | ||||
12305 | /// | ||||
12306 | /// \param OpLoc The location of the operator itself (e.g., '*'). | ||||
12307 | /// | ||||
12308 | /// \param Opc The UnaryOperatorKind that describes this operator. | ||||
12309 | /// | ||||
12310 | /// \param Fns The set of non-member functions that will be | ||||
12311 | /// considered by overload resolution. The caller needs to build this | ||||
12312 | /// set based on the context using, e.g., | ||||
12313 | /// LookupOverloadedOperatorName() and ArgumentDependentLookup(). This | ||||
12314 | /// set should not contain any member functions; those will be added | ||||
12315 | /// by CreateOverloadedUnaryOp(). | ||||
12316 | /// | ||||
12317 | /// \param Input The input argument. | ||||
12318 | ExprResult | ||||
12319 | Sema::CreateOverloadedUnaryOp(SourceLocation OpLoc, UnaryOperatorKind Opc, | ||||
12320 | const UnresolvedSetImpl &Fns, | ||||
12321 | Expr *Input, bool PerformADL) { | ||||
12322 | OverloadedOperatorKind Op = UnaryOperator::getOverloadedOperator(Opc); | ||||
12323 | assert(Op != OO_None && "Invalid opcode for overloaded unary operator")((Op != OO_None && "Invalid opcode for overloaded unary operator" ) ? static_cast<void> (0) : __assert_fail ("Op != OO_None && \"Invalid opcode for overloaded unary operator\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12323, __PRETTY_FUNCTION__)); | ||||
12324 | DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(Op); | ||||
12325 | // TODO: provide better source location info. | ||||
12326 | DeclarationNameInfo OpNameInfo(OpName, OpLoc); | ||||
12327 | |||||
12328 | if (checkPlaceholderForOverload(*this, Input)) | ||||
12329 | return ExprError(); | ||||
12330 | |||||
12331 | Expr *Args[2] = { Input, nullptr }; | ||||
12332 | unsigned NumArgs = 1; | ||||
12333 | |||||
12334 | // For post-increment and post-decrement, add the implicit '0' as | ||||
12335 | // the second argument, so that we know this is a post-increment or | ||||
12336 | // post-decrement. | ||||
12337 | if (Opc == UO_PostInc || Opc == UO_PostDec) { | ||||
12338 | llvm::APSInt Zero(Context.getTypeSize(Context.IntTy), false); | ||||
12339 | Args[1] = IntegerLiteral::Create(Context, Zero, Context.IntTy, | ||||
12340 | SourceLocation()); | ||||
12341 | NumArgs = 2; | ||||
12342 | } | ||||
12343 | |||||
12344 | ArrayRef<Expr *> ArgsArray(Args, NumArgs); | ||||
12345 | |||||
12346 | if (Input->isTypeDependent()) { | ||||
12347 | if (Fns.empty()) | ||||
12348 | return new (Context) UnaryOperator(Input, Opc, Context.DependentTy, | ||||
12349 | VK_RValue, OK_Ordinary, OpLoc, false); | ||||
12350 | |||||
12351 | CXXRecordDecl *NamingClass = nullptr; // lookup ignores member operators | ||||
12352 | UnresolvedLookupExpr *Fn = UnresolvedLookupExpr::Create( | ||||
12353 | Context, NamingClass, NestedNameSpecifierLoc(), OpNameInfo, | ||||
12354 | /*ADL*/ true, IsOverloaded(Fns), Fns.begin(), Fns.end()); | ||||
12355 | return CXXOperatorCallExpr::Create(Context, Op, Fn, ArgsArray, | ||||
12356 | Context.DependentTy, VK_RValue, OpLoc, | ||||
12357 | FPOptions()); | ||||
12358 | } | ||||
12359 | |||||
12360 | // Build an empty overload set. | ||||
12361 | OverloadCandidateSet CandidateSet(OpLoc, OverloadCandidateSet::CSK_Operator); | ||||
12362 | |||||
12363 | // Add the candidates from the given function set. | ||||
12364 | AddFunctionCandidates(Fns, ArgsArray, CandidateSet); | ||||
12365 | |||||
12366 | // Add operator candidates that are member functions. | ||||
12367 | AddMemberOperatorCandidates(Op, OpLoc, ArgsArray, CandidateSet); | ||||
12368 | |||||
12369 | // Add candidates from ADL. | ||||
12370 | if (PerformADL) { | ||||
12371 | AddArgumentDependentLookupCandidates(OpName, OpLoc, ArgsArray, | ||||
12372 | /*ExplicitTemplateArgs*/nullptr, | ||||
12373 | CandidateSet); | ||||
12374 | } | ||||
12375 | |||||
12376 | // Add builtin operator candidates. | ||||
12377 | AddBuiltinOperatorCandidates(Op, OpLoc, ArgsArray, CandidateSet); | ||||
12378 | |||||
12379 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | ||||
12380 | |||||
12381 | // Perform overload resolution. | ||||
12382 | OverloadCandidateSet::iterator Best; | ||||
12383 | switch (CandidateSet.BestViableFunction(*this, OpLoc, Best)) { | ||||
12384 | case OR_Success: { | ||||
12385 | // We found a built-in operator or an overloaded operator. | ||||
12386 | FunctionDecl *FnDecl = Best->Function; | ||||
12387 | |||||
12388 | if (FnDecl) { | ||||
12389 | Expr *Base = nullptr; | ||||
12390 | // We matched an overloaded operator. Build a call to that | ||||
12391 | // operator. | ||||
12392 | |||||
12393 | // Convert the arguments. | ||||
12394 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { | ||||
12395 | CheckMemberOperatorAccess(OpLoc, Args[0], nullptr, Best->FoundDecl); | ||||
12396 | |||||
12397 | ExprResult InputRes = | ||||
12398 | PerformObjectArgumentInitialization(Input, /*Qualifier=*/nullptr, | ||||
12399 | Best->FoundDecl, Method); | ||||
12400 | if (InputRes.isInvalid()) | ||||
12401 | return ExprError(); | ||||
12402 | Base = Input = InputRes.get(); | ||||
12403 | } else { | ||||
12404 | // Convert the arguments. | ||||
12405 | ExprResult InputInit | ||||
12406 | = PerformCopyInitialization(InitializedEntity::InitializeParameter( | ||||
12407 | Context, | ||||
12408 | FnDecl->getParamDecl(0)), | ||||
12409 | SourceLocation(), | ||||
12410 | Input); | ||||
12411 | if (InputInit.isInvalid()) | ||||
12412 | return ExprError(); | ||||
12413 | Input = InputInit.get(); | ||||
12414 | } | ||||
12415 | |||||
12416 | // Build the actual expression node. | ||||
12417 | ExprResult FnExpr = CreateFunctionRefExpr(*this, FnDecl, Best->FoundDecl, | ||||
12418 | Base, HadMultipleCandidates, | ||||
12419 | OpLoc); | ||||
12420 | if (FnExpr.isInvalid()) | ||||
12421 | return ExprError(); | ||||
12422 | |||||
12423 | // Determine the result type. | ||||
12424 | QualType ResultTy = FnDecl->getReturnType(); | ||||
12425 | ExprValueKind VK = Expr::getValueKindForType(ResultTy); | ||||
12426 | ResultTy = ResultTy.getNonLValueExprType(Context); | ||||
12427 | |||||
12428 | Args[0] = Input; | ||||
12429 | CallExpr *TheCall = CXXOperatorCallExpr::Create( | ||||
12430 | Context, Op, FnExpr.get(), ArgsArray, ResultTy, VK, OpLoc, | ||||
12431 | FPOptions(), Best->IsADLCandidate); | ||||
12432 | |||||
12433 | if (CheckCallReturnType(FnDecl->getReturnType(), OpLoc, TheCall, FnDecl)) | ||||
12434 | return ExprError(); | ||||
12435 | |||||
12436 | if (CheckFunctionCall(FnDecl, TheCall, | ||||
12437 | FnDecl->getType()->castAs<FunctionProtoType>())) | ||||
12438 | return ExprError(); | ||||
12439 | |||||
12440 | return MaybeBindToTemporary(TheCall); | ||||
12441 | } else { | ||||
12442 | // We matched a built-in operator. Convert the arguments, then | ||||
12443 | // break out so that we will build the appropriate built-in | ||||
12444 | // operator node. | ||||
12445 | ExprResult InputRes = PerformImplicitConversion( | ||||
12446 | Input, Best->BuiltinParamTypes[0], Best->Conversions[0], AA_Passing, | ||||
12447 | CCK_ForBuiltinOverloadedOp); | ||||
12448 | if (InputRes.isInvalid()) | ||||
12449 | return ExprError(); | ||||
12450 | Input = InputRes.get(); | ||||
12451 | break; | ||||
12452 | } | ||||
12453 | } | ||||
12454 | |||||
12455 | case OR_No_Viable_Function: | ||||
12456 | // This is an erroneous use of an operator which can be overloaded by | ||||
12457 | // a non-member function. Check for non-member operators which were | ||||
12458 | // defined too late to be candidates. | ||||
12459 | if (DiagnoseTwoPhaseOperatorLookup(*this, Op, OpLoc, ArgsArray)) | ||||
12460 | // FIXME: Recover by calling the found function. | ||||
12461 | return ExprError(); | ||||
12462 | |||||
12463 | // No viable function; fall through to handling this as a | ||||
12464 | // built-in operator, which will produce an error message for us. | ||||
12465 | break; | ||||
12466 | |||||
12467 | case OR_Ambiguous: | ||||
12468 | CandidateSet.NoteCandidates( | ||||
12469 | PartialDiagnosticAt(OpLoc, | ||||
12470 | PDiag(diag::err_ovl_ambiguous_oper_unary) | ||||
12471 | << UnaryOperator::getOpcodeStr(Opc) | ||||
12472 | << Input->getType() << Input->getSourceRange()), | ||||
12473 | *this, OCD_ViableCandidates, ArgsArray, | ||||
12474 | UnaryOperator::getOpcodeStr(Opc), OpLoc); | ||||
12475 | return ExprError(); | ||||
12476 | |||||
12477 | case OR_Deleted: | ||||
12478 | CandidateSet.NoteCandidates( | ||||
12479 | PartialDiagnosticAt(OpLoc, PDiag(diag::err_ovl_deleted_oper) | ||||
12480 | << UnaryOperator::getOpcodeStr(Opc) | ||||
12481 | << Input->getSourceRange()), | ||||
12482 | *this, OCD_AllCandidates, ArgsArray, UnaryOperator::getOpcodeStr(Opc), | ||||
12483 | OpLoc); | ||||
12484 | return ExprError(); | ||||
12485 | } | ||||
12486 | |||||
12487 | // Either we found no viable overloaded operator or we matched a | ||||
12488 | // built-in operator. In either case, fall through to trying to | ||||
12489 | // build a built-in operation. | ||||
12490 | return CreateBuiltinUnaryOp(OpLoc, Opc, Input); | ||||
12491 | } | ||||
12492 | |||||
12493 | /// Create a binary operation that may resolve to an overloaded | ||||
12494 | /// operator. | ||||
12495 | /// | ||||
12496 | /// \param OpLoc The location of the operator itself (e.g., '+'). | ||||
12497 | /// | ||||
12498 | /// \param Opc The BinaryOperatorKind that describes this operator. | ||||
12499 | /// | ||||
12500 | /// \param Fns The set of non-member functions that will be | ||||
12501 | /// considered by overload resolution. The caller needs to build this | ||||
12502 | /// set based on the context using, e.g., | ||||
12503 | /// LookupOverloadedOperatorName() and ArgumentDependentLookup(). This | ||||
12504 | /// set should not contain any member functions; those will be added | ||||
12505 | /// by CreateOverloadedBinOp(). | ||||
12506 | /// | ||||
12507 | /// \param LHS Left-hand argument. | ||||
12508 | /// \param RHS Right-hand argument. | ||||
12509 | ExprResult | ||||
12510 | Sema::CreateOverloadedBinOp(SourceLocation OpLoc, | ||||
12511 | BinaryOperatorKind Opc, | ||||
12512 | const UnresolvedSetImpl &Fns, | ||||
12513 | Expr *LHS, Expr *RHS, bool PerformADL) { | ||||
12514 | Expr *Args[2] = { LHS, RHS }; | ||||
12515 | LHS=RHS=nullptr; // Please use only Args instead of LHS/RHS couple | ||||
12516 | |||||
12517 | OverloadedOperatorKind Op = BinaryOperator::getOverloadedOperator(Opc); | ||||
12518 | DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(Op); | ||||
12519 | |||||
12520 | // If either side is type-dependent, create an appropriate dependent | ||||
12521 | // expression. | ||||
12522 | if (Args[0]->isTypeDependent() || Args[1]->isTypeDependent()) { | ||||
12523 | if (Fns.empty()) { | ||||
12524 | // If there are no functions to store, just build a dependent | ||||
12525 | // BinaryOperator or CompoundAssignment. | ||||
12526 | if (Opc <= BO_Assign || Opc > BO_OrAssign) | ||||
12527 | return new (Context) BinaryOperator( | ||||
12528 | Args[0], Args[1], Opc, Context.DependentTy, VK_RValue, OK_Ordinary, | ||||
12529 | OpLoc, FPFeatures); | ||||
12530 | |||||
12531 | return new (Context) CompoundAssignOperator( | ||||
12532 | Args[0], Args[1], Opc, Context.DependentTy, VK_LValue, OK_Ordinary, | ||||
12533 | Context.DependentTy, Context.DependentTy, OpLoc, | ||||
12534 | FPFeatures); | ||||
12535 | } | ||||
12536 | |||||
12537 | // FIXME: save results of ADL from here? | ||||
12538 | CXXRecordDecl *NamingClass = nullptr; // lookup ignores member operators | ||||
12539 | // TODO: provide better source location info in DNLoc component. | ||||
12540 | DeclarationNameInfo OpNameInfo(OpName, OpLoc); | ||||
12541 | UnresolvedLookupExpr *Fn = UnresolvedLookupExpr::Create( | ||||
12542 | Context, NamingClass, NestedNameSpecifierLoc(), OpNameInfo, | ||||
12543 | /*ADL*/ PerformADL, IsOverloaded(Fns), Fns.begin(), Fns.end()); | ||||
12544 | return CXXOperatorCallExpr::Create(Context, Op, Fn, Args, | ||||
12545 | Context.DependentTy, VK_RValue, OpLoc, | ||||
12546 | FPFeatures); | ||||
12547 | } | ||||
12548 | |||||
12549 | // Always do placeholder-like conversions on the RHS. | ||||
12550 | if (checkPlaceholderForOverload(*this, Args[1])) | ||||
12551 | return ExprError(); | ||||
12552 | |||||
12553 | // Do placeholder-like conversion on the LHS; note that we should | ||||
12554 | // not get here with a PseudoObject LHS. | ||||
12555 | assert(Args[0]->getObjectKind() != OK_ObjCProperty)((Args[0]->getObjectKind() != OK_ObjCProperty) ? static_cast <void> (0) : __assert_fail ("Args[0]->getObjectKind() != OK_ObjCProperty" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12555, __PRETTY_FUNCTION__)); | ||||
12556 | if (checkPlaceholderForOverload(*this, Args[0])) | ||||
12557 | return ExprError(); | ||||
12558 | |||||
12559 | // If this is the assignment operator, we only perform overload resolution | ||||
12560 | // if the left-hand side is a class or enumeration type. This is actually | ||||
12561 | // a hack. The standard requires that we do overload resolution between the | ||||
12562 | // various built-in candidates, but as DR507 points out, this can lead to | ||||
12563 | // problems. So we do it this way, which pretty much follows what GCC does. | ||||
12564 | // Note that we go the traditional code path for compound assignment forms. | ||||
12565 | if (Opc == BO_Assign && !Args[0]->getType()->isOverloadableType()) | ||||
12566 | return CreateBuiltinBinOp(OpLoc, Opc, Args[0], Args[1]); | ||||
12567 | |||||
12568 | // If this is the .* operator, which is not overloadable, just | ||||
12569 | // create a built-in binary operator. | ||||
12570 | if (Opc == BO_PtrMemD) | ||||
12571 | return CreateBuiltinBinOp(OpLoc, Opc, Args[0], Args[1]); | ||||
12572 | |||||
12573 | // Build an empty overload set. | ||||
12574 | OverloadCandidateSet CandidateSet(OpLoc, OverloadCandidateSet::CSK_Operator); | ||||
12575 | |||||
12576 | // Add the candidates from the given function set. | ||||
12577 | AddFunctionCandidates(Fns, Args, CandidateSet); | ||||
12578 | |||||
12579 | // Add operator candidates that are member functions. | ||||
12580 | AddMemberOperatorCandidates(Op, OpLoc, Args, CandidateSet); | ||||
12581 | |||||
12582 | // Add candidates from ADL. Per [over.match.oper]p2, this lookup is not | ||||
12583 | // performed for an assignment operator (nor for operator[] nor operator->, | ||||
12584 | // which don't get here). | ||||
12585 | if (Opc != BO_Assign && PerformADL) | ||||
12586 | AddArgumentDependentLookupCandidates(OpName, OpLoc, Args, | ||||
12587 | /*ExplicitTemplateArgs*/ nullptr, | ||||
12588 | CandidateSet); | ||||
12589 | |||||
12590 | // Add builtin operator candidates. | ||||
12591 | AddBuiltinOperatorCandidates(Op, OpLoc, Args, CandidateSet); | ||||
12592 | |||||
12593 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | ||||
12594 | |||||
12595 | // Perform overload resolution. | ||||
12596 | OverloadCandidateSet::iterator Best; | ||||
12597 | switch (CandidateSet.BestViableFunction(*this, OpLoc, Best)) { | ||||
12598 | case OR_Success: { | ||||
12599 | // We found a built-in operator or an overloaded operator. | ||||
12600 | FunctionDecl *FnDecl = Best->Function; | ||||
12601 | |||||
12602 | if (FnDecl) { | ||||
12603 | Expr *Base = nullptr; | ||||
12604 | // We matched an overloaded operator. Build a call to that | ||||
12605 | // operator. | ||||
12606 | |||||
12607 | // Convert the arguments. | ||||
12608 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { | ||||
12609 | // Best->Access is only meaningful for class members. | ||||
12610 | CheckMemberOperatorAccess(OpLoc, Args[0], Args[1], Best->FoundDecl); | ||||
12611 | |||||
12612 | ExprResult Arg1 = | ||||
12613 | PerformCopyInitialization( | ||||
12614 | InitializedEntity::InitializeParameter(Context, | ||||
12615 | FnDecl->getParamDecl(0)), | ||||
12616 | SourceLocation(), Args[1]); | ||||
12617 | if (Arg1.isInvalid()) | ||||
12618 | return ExprError(); | ||||
12619 | |||||
12620 | ExprResult Arg0 = | ||||
12621 | PerformObjectArgumentInitialization(Args[0], /*Qualifier=*/nullptr, | ||||
12622 | Best->FoundDecl, Method); | ||||
12623 | if (Arg0.isInvalid()) | ||||
12624 | return ExprError(); | ||||
12625 | Base = Args[0] = Arg0.getAs<Expr>(); | ||||
12626 | Args[1] = RHS = Arg1.getAs<Expr>(); | ||||
12627 | } else { | ||||
12628 | // Convert the arguments. | ||||
12629 | ExprResult Arg0 = PerformCopyInitialization( | ||||
12630 | InitializedEntity::InitializeParameter(Context, | ||||
12631 | FnDecl->getParamDecl(0)), | ||||
12632 | SourceLocation(), Args[0]); | ||||
12633 | if (Arg0.isInvalid()) | ||||
12634 | return ExprError(); | ||||
12635 | |||||
12636 | ExprResult Arg1 = | ||||
12637 | PerformCopyInitialization( | ||||
12638 | InitializedEntity::InitializeParameter(Context, | ||||
12639 | FnDecl->getParamDecl(1)), | ||||
12640 | SourceLocation(), Args[1]); | ||||
12641 | if (Arg1.isInvalid()) | ||||
12642 | return ExprError(); | ||||
12643 | Args[0] = LHS = Arg0.getAs<Expr>(); | ||||
12644 | Args[1] = RHS = Arg1.getAs<Expr>(); | ||||
12645 | } | ||||
12646 | |||||
12647 | // Build the actual expression node. | ||||
12648 | ExprResult FnExpr = CreateFunctionRefExpr(*this, FnDecl, | ||||
12649 | Best->FoundDecl, Base, | ||||
12650 | HadMultipleCandidates, OpLoc); | ||||
12651 | if (FnExpr.isInvalid()) | ||||
12652 | return ExprError(); | ||||
12653 | |||||
12654 | // Determine the result type. | ||||
12655 | QualType ResultTy = FnDecl->getReturnType(); | ||||
12656 | ExprValueKind VK = Expr::getValueKindForType(ResultTy); | ||||
12657 | ResultTy = ResultTy.getNonLValueExprType(Context); | ||||
12658 | |||||
12659 | CXXOperatorCallExpr *TheCall = CXXOperatorCallExpr::Create( | ||||
12660 | Context, Op, FnExpr.get(), Args, ResultTy, VK, OpLoc, FPFeatures, | ||||
12661 | Best->IsADLCandidate); | ||||
12662 | |||||
12663 | if (CheckCallReturnType(FnDecl->getReturnType(), OpLoc, TheCall, | ||||
12664 | FnDecl)) | ||||
12665 | return ExprError(); | ||||
12666 | |||||
12667 | ArrayRef<const Expr *> ArgsArray(Args, 2); | ||||
12668 | const Expr *ImplicitThis = nullptr; | ||||
12669 | // Cut off the implicit 'this'. | ||||
12670 | if (isa<CXXMethodDecl>(FnDecl)) { | ||||
12671 | ImplicitThis = ArgsArray[0]; | ||||
12672 | ArgsArray = ArgsArray.slice(1); | ||||
12673 | } | ||||
12674 | |||||
12675 | // Check for a self move. | ||||
12676 | if (Op == OO_Equal) | ||||
12677 | DiagnoseSelfMove(Args[0], Args[1], OpLoc); | ||||
12678 | |||||
12679 | checkCall(FnDecl, nullptr, ImplicitThis, ArgsArray, | ||||
12680 | isa<CXXMethodDecl>(FnDecl), OpLoc, TheCall->getSourceRange(), | ||||
12681 | VariadicDoesNotApply); | ||||
12682 | |||||
12683 | return MaybeBindToTemporary(TheCall); | ||||
12684 | } else { | ||||
12685 | // We matched a built-in operator. Convert the arguments, then | ||||
12686 | // break out so that we will build the appropriate built-in | ||||
12687 | // operator node. | ||||
12688 | ExprResult ArgsRes0 = PerformImplicitConversion( | ||||
12689 | Args[0], Best->BuiltinParamTypes[0], Best->Conversions[0], | ||||
12690 | AA_Passing, CCK_ForBuiltinOverloadedOp); | ||||
12691 | if (ArgsRes0.isInvalid()) | ||||
12692 | return ExprError(); | ||||
12693 | Args[0] = ArgsRes0.get(); | ||||
12694 | |||||
12695 | ExprResult ArgsRes1 = PerformImplicitConversion( | ||||
12696 | Args[1], Best->BuiltinParamTypes[1], Best->Conversions[1], | ||||
12697 | AA_Passing, CCK_ForBuiltinOverloadedOp); | ||||
12698 | if (ArgsRes1.isInvalid()) | ||||
12699 | return ExprError(); | ||||
12700 | Args[1] = ArgsRes1.get(); | ||||
12701 | break; | ||||
12702 | } | ||||
12703 | } | ||||
12704 | |||||
12705 | case OR_No_Viable_Function: { | ||||
12706 | // C++ [over.match.oper]p9: | ||||
12707 | // If the operator is the operator , [...] and there are no | ||||
12708 | // viable functions, then the operator is assumed to be the | ||||
12709 | // built-in operator and interpreted according to clause 5. | ||||
12710 | if (Opc == BO_Comma) | ||||
12711 | break; | ||||
12712 | |||||
12713 | // For class as left operand for assignment or compound assignment | ||||
12714 | // operator do not fall through to handling in built-in, but report that | ||||
12715 | // no overloaded assignment operator found | ||||
12716 | ExprResult Result = ExprError(); | ||||
12717 | StringRef OpcStr = BinaryOperator::getOpcodeStr(Opc); | ||||
12718 | auto Cands = CandidateSet.CompleteCandidates(*this, OCD_AllCandidates, | ||||
12719 | Args, OpLoc); | ||||
12720 | if (Args[0]->getType()->isRecordType() && | ||||
12721 | Opc >= BO_Assign && Opc <= BO_OrAssign) { | ||||
12722 | Diag(OpLoc, diag::err_ovl_no_viable_oper) | ||||
12723 | << BinaryOperator::getOpcodeStr(Opc) | ||||
12724 | << Args[0]->getSourceRange() << Args[1]->getSourceRange(); | ||||
12725 | if (Args[0]->getType()->isIncompleteType()) { | ||||
12726 | Diag(OpLoc, diag::note_assign_lhs_incomplete) | ||||
12727 | << Args[0]->getType() | ||||
12728 | << Args[0]->getSourceRange() << Args[1]->getSourceRange(); | ||||
12729 | } | ||||
12730 | } else { | ||||
12731 | // This is an erroneous use of an operator which can be overloaded by | ||||
12732 | // a non-member function. Check for non-member operators which were | ||||
12733 | // defined too late to be candidates. | ||||
12734 | if (DiagnoseTwoPhaseOperatorLookup(*this, Op, OpLoc, Args)) | ||||
12735 | // FIXME: Recover by calling the found function. | ||||
12736 | return ExprError(); | ||||
12737 | |||||
12738 | // No viable function; try to create a built-in operation, which will | ||||
12739 | // produce an error. Then, show the non-viable candidates. | ||||
12740 | Result = CreateBuiltinBinOp(OpLoc, Opc, Args[0], Args[1]); | ||||
12741 | } | ||||
12742 | assert(Result.isInvalid() &&((Result.isInvalid() && "C++ binary operator overloading is missing candidates!" ) ? static_cast<void> (0) : __assert_fail ("Result.isInvalid() && \"C++ binary operator overloading is missing candidates!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12743, __PRETTY_FUNCTION__)) | ||||
12743 | "C++ binary operator overloading is missing candidates!")((Result.isInvalid() && "C++ binary operator overloading is missing candidates!" ) ? static_cast<void> (0) : __assert_fail ("Result.isInvalid() && \"C++ binary operator overloading is missing candidates!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12743, __PRETTY_FUNCTION__)); | ||||
12744 | CandidateSet.NoteCandidates(*this, Args, Cands, OpcStr, OpLoc); | ||||
12745 | return Result; | ||||
12746 | } | ||||
12747 | |||||
12748 | case OR_Ambiguous: | ||||
12749 | CandidateSet.NoteCandidates( | ||||
12750 | PartialDiagnosticAt(OpLoc, PDiag(diag::err_ovl_ambiguous_oper_binary) | ||||
12751 | << BinaryOperator::getOpcodeStr(Opc) | ||||
12752 | << Args[0]->getType() | ||||
12753 | << Args[1]->getType() | ||||
12754 | << Args[0]->getSourceRange() | ||||
12755 | << Args[1]->getSourceRange()), | ||||
12756 | *this, OCD_ViableCandidates, Args, BinaryOperator::getOpcodeStr(Opc), | ||||
12757 | OpLoc); | ||||
12758 | return ExprError(); | ||||
12759 | |||||
12760 | case OR_Deleted: | ||||
12761 | if (isImplicitlyDeleted(Best->Function)) { | ||||
12762 | CXXMethodDecl *Method = cast<CXXMethodDecl>(Best->Function); | ||||
12763 | Diag(OpLoc, diag::err_ovl_deleted_special_oper) | ||||
12764 | << Context.getRecordType(Method->getParent()) | ||||
12765 | << getSpecialMember(Method); | ||||
12766 | |||||
12767 | // The user probably meant to call this special member. Just | ||||
12768 | // explain why it's deleted. | ||||
12769 | NoteDeletedFunction(Method); | ||||
12770 | return ExprError(); | ||||
12771 | } | ||||
12772 | CandidateSet.NoteCandidates( | ||||
12773 | PartialDiagnosticAt(OpLoc, PDiag(diag::err_ovl_deleted_oper) | ||||
12774 | << BinaryOperator::getOpcodeStr(Opc) | ||||
12775 | << Args[0]->getSourceRange() | ||||
12776 | << Args[1]->getSourceRange()), | ||||
12777 | *this, OCD_AllCandidates, Args, BinaryOperator::getOpcodeStr(Opc), | ||||
12778 | OpLoc); | ||||
12779 | return ExprError(); | ||||
12780 | } | ||||
12781 | |||||
12782 | // We matched a built-in operator; build it. | ||||
12783 | return CreateBuiltinBinOp(OpLoc, Opc, Args[0], Args[1]); | ||||
12784 | } | ||||
12785 | |||||
12786 | ExprResult | ||||
12787 | Sema::CreateOverloadedArraySubscriptExpr(SourceLocation LLoc, | ||||
12788 | SourceLocation RLoc, | ||||
12789 | Expr *Base, Expr *Idx) { | ||||
12790 | Expr *Args[2] = { Base, Idx }; | ||||
12791 | DeclarationName OpName = | ||||
12792 | Context.DeclarationNames.getCXXOperatorName(OO_Subscript); | ||||
12793 | |||||
12794 | // If either side is type-dependent, create an appropriate dependent | ||||
12795 | // expression. | ||||
12796 | if (Args[0]->isTypeDependent() || Args[1]->isTypeDependent()) { | ||||
12797 | |||||
12798 | CXXRecordDecl *NamingClass = nullptr; // lookup ignores member operators | ||||
12799 | // CHECKME: no 'operator' keyword? | ||||
12800 | DeclarationNameInfo OpNameInfo(OpName, LLoc); | ||||
12801 | OpNameInfo.setCXXOperatorNameRange(SourceRange(LLoc, RLoc)); | ||||
12802 | UnresolvedLookupExpr *Fn | ||||
12803 | = UnresolvedLookupExpr::Create(Context, NamingClass, | ||||
12804 | NestedNameSpecifierLoc(), OpNameInfo, | ||||
12805 | /*ADL*/ true, /*Overloaded*/ false, | ||||
12806 | UnresolvedSetIterator(), | ||||
12807 | UnresolvedSetIterator()); | ||||
12808 | // Can't add any actual overloads yet | ||||
12809 | |||||
12810 | return CXXOperatorCallExpr::Create(Context, OO_Subscript, Fn, Args, | ||||
12811 | Context.DependentTy, VK_RValue, RLoc, | ||||
12812 | FPOptions()); | ||||
12813 | } | ||||
12814 | |||||
12815 | // Handle placeholders on both operands. | ||||
12816 | if (checkPlaceholderForOverload(*this, Args[0])) | ||||
12817 | return ExprError(); | ||||
12818 | if (checkPlaceholderForOverload(*this, Args[1])) | ||||
12819 | return ExprError(); | ||||
12820 | |||||
12821 | // Build an empty overload set. | ||||
12822 | OverloadCandidateSet CandidateSet(LLoc, OverloadCandidateSet::CSK_Operator); | ||||
12823 | |||||
12824 | // Subscript can only be overloaded as a member function. | ||||
12825 | |||||
12826 | // Add operator candidates that are member functions. | ||||
12827 | AddMemberOperatorCandidates(OO_Subscript, LLoc, Args, CandidateSet); | ||||
12828 | |||||
12829 | // Add builtin operator candidates. | ||||
12830 | AddBuiltinOperatorCandidates(OO_Subscript, LLoc, Args, CandidateSet); | ||||
12831 | |||||
12832 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | ||||
12833 | |||||
12834 | // Perform overload resolution. | ||||
12835 | OverloadCandidateSet::iterator Best; | ||||
12836 | switch (CandidateSet.BestViableFunction(*this, LLoc, Best)) { | ||||
12837 | case OR_Success: { | ||||
12838 | // We found a built-in operator or an overloaded operator. | ||||
12839 | FunctionDecl *FnDecl = Best->Function; | ||||
12840 | |||||
12841 | if (FnDecl) { | ||||
12842 | // We matched an overloaded operator. Build a call to that | ||||
12843 | // operator. | ||||
12844 | |||||
12845 | CheckMemberOperatorAccess(LLoc, Args[0], Args[1], Best->FoundDecl); | ||||
12846 | |||||
12847 | // Convert the arguments. | ||||
12848 | CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); | ||||
12849 | ExprResult Arg0 = | ||||
12850 | PerformObjectArgumentInitialization(Args[0], /*Qualifier=*/nullptr, | ||||
12851 | Best->FoundDecl, Method); | ||||
12852 | if (Arg0.isInvalid()) | ||||
12853 | return ExprError(); | ||||
12854 | Args[0] = Arg0.get(); | ||||
12855 | |||||
12856 | // Convert the arguments. | ||||
12857 | ExprResult InputInit | ||||
12858 | = PerformCopyInitialization(InitializedEntity::InitializeParameter( | ||||
12859 | Context, | ||||
12860 | FnDecl->getParamDecl(0)), | ||||
12861 | SourceLocation(), | ||||
12862 | Args[1]); | ||||
12863 | if (InputInit.isInvalid()) | ||||
12864 | return ExprError(); | ||||
12865 | |||||
12866 | Args[1] = InputInit.getAs<Expr>(); | ||||
12867 | |||||
12868 | // Build the actual expression node. | ||||
12869 | DeclarationNameInfo OpLocInfo(OpName, LLoc); | ||||
12870 | OpLocInfo.setCXXOperatorNameRange(SourceRange(LLoc, RLoc)); | ||||
12871 | ExprResult FnExpr = CreateFunctionRefExpr(*this, FnDecl, | ||||
12872 | Best->FoundDecl, | ||||
12873 | Base, | ||||
12874 | HadMultipleCandidates, | ||||
12875 | OpLocInfo.getLoc(), | ||||
12876 | OpLocInfo.getInfo()); | ||||
12877 | if (FnExpr.isInvalid()) | ||||
12878 | return ExprError(); | ||||
12879 | |||||
12880 | // Determine the result type | ||||
12881 | QualType ResultTy = FnDecl->getReturnType(); | ||||
12882 | ExprValueKind VK = Expr::getValueKindForType(ResultTy); | ||||
12883 | ResultTy = ResultTy.getNonLValueExprType(Context); | ||||
12884 | |||||
12885 | CXXOperatorCallExpr *TheCall = | ||||
12886 | CXXOperatorCallExpr::Create(Context, OO_Subscript, FnExpr.get(), | ||||
12887 | Args, ResultTy, VK, RLoc, FPOptions()); | ||||
12888 | |||||
12889 | if (CheckCallReturnType(FnDecl->getReturnType(), LLoc, TheCall, FnDecl)) | ||||
12890 | return ExprError(); | ||||
12891 | |||||
12892 | if (CheckFunctionCall(Method, TheCall, | ||||
12893 | Method->getType()->castAs<FunctionProtoType>())) | ||||
12894 | return ExprError(); | ||||
12895 | |||||
12896 | return MaybeBindToTemporary(TheCall); | ||||
12897 | } else { | ||||
12898 | // We matched a built-in operator. Convert the arguments, then | ||||
12899 | // break out so that we will build the appropriate built-in | ||||
12900 | // operator node. | ||||
12901 | ExprResult ArgsRes0 = PerformImplicitConversion( | ||||
12902 | Args[0], Best->BuiltinParamTypes[0], Best->Conversions[0], | ||||
12903 | AA_Passing, CCK_ForBuiltinOverloadedOp); | ||||
12904 | if (ArgsRes0.isInvalid()) | ||||
12905 | return ExprError(); | ||||
12906 | Args[0] = ArgsRes0.get(); | ||||
12907 | |||||
12908 | ExprResult ArgsRes1 = PerformImplicitConversion( | ||||
12909 | Args[1], Best->BuiltinParamTypes[1], Best->Conversions[1], | ||||
12910 | AA_Passing, CCK_ForBuiltinOverloadedOp); | ||||
12911 | if (ArgsRes1.isInvalid()) | ||||
12912 | return ExprError(); | ||||
12913 | Args[1] = ArgsRes1.get(); | ||||
12914 | |||||
12915 | break; | ||||
12916 | } | ||||
12917 | } | ||||
12918 | |||||
12919 | case OR_No_Viable_Function: { | ||||
12920 | PartialDiagnostic PD = CandidateSet.empty() | ||||
12921 | ? (PDiag(diag::err_ovl_no_oper) | ||||
12922 | << Args[0]->getType() << /*subscript*/ 0 | ||||
12923 | << Args[0]->getSourceRange() << Args[1]->getSourceRange()) | ||||
12924 | : (PDiag(diag::err_ovl_no_viable_subscript) | ||||
12925 | << Args[0]->getType() << Args[0]->getSourceRange() | ||||
12926 | << Args[1]->getSourceRange()); | ||||
12927 | CandidateSet.NoteCandidates(PartialDiagnosticAt(LLoc, PD), *this, | ||||
12928 | OCD_AllCandidates, Args, "[]", LLoc); | ||||
12929 | return ExprError(); | ||||
12930 | } | ||||
12931 | |||||
12932 | case OR_Ambiguous: | ||||
12933 | CandidateSet.NoteCandidates( | ||||
12934 | PartialDiagnosticAt(LLoc, PDiag(diag::err_ovl_ambiguous_oper_binary) | ||||
12935 | << "[]" << Args[0]->getType() | ||||
12936 | << Args[1]->getType() | ||||
12937 | << Args[0]->getSourceRange() | ||||
12938 | << Args[1]->getSourceRange()), | ||||
12939 | *this, OCD_ViableCandidates, Args, "[]", LLoc); | ||||
12940 | return ExprError(); | ||||
12941 | |||||
12942 | case OR_Deleted: | ||||
12943 | CandidateSet.NoteCandidates( | ||||
12944 | PartialDiagnosticAt(LLoc, PDiag(diag::err_ovl_deleted_oper) | ||||
12945 | << "[]" << Args[0]->getSourceRange() | ||||
12946 | << Args[1]->getSourceRange()), | ||||
12947 | *this, OCD_AllCandidates, Args, "[]", LLoc); | ||||
12948 | return ExprError(); | ||||
12949 | } | ||||
12950 | |||||
12951 | // We matched a built-in operator; build it. | ||||
12952 | return CreateBuiltinArraySubscriptExpr(Args[0], LLoc, Args[1], RLoc); | ||||
12953 | } | ||||
12954 | |||||
12955 | /// BuildCallToMemberFunction - Build a call to a member | ||||
12956 | /// function. MemExpr is the expression that refers to the member | ||||
12957 | /// function (and includes the object parameter), Args/NumArgs are the | ||||
12958 | /// arguments to the function call (not including the object | ||||
12959 | /// parameter). The caller needs to validate that the member | ||||
12960 | /// expression refers to a non-static member function or an overloaded | ||||
12961 | /// member function. | ||||
12962 | ExprResult | ||||
12963 | Sema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE, | ||||
12964 | SourceLocation LParenLoc, | ||||
12965 | MultiExprArg Args, | ||||
12966 | SourceLocation RParenLoc) { | ||||
12967 | assert(MemExprE->getType() == Context.BoundMemberTy ||((MemExprE->getType() == Context.BoundMemberTy || MemExprE ->getType() == Context.OverloadTy) ? static_cast<void> (0) : __assert_fail ("MemExprE->getType() == Context.BoundMemberTy || MemExprE->getType() == Context.OverloadTy" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12968, __PRETTY_FUNCTION__)) | ||||
12968 | MemExprE->getType() == Context.OverloadTy)((MemExprE->getType() == Context.BoundMemberTy || MemExprE ->getType() == Context.OverloadTy) ? static_cast<void> (0) : __assert_fail ("MemExprE->getType() == Context.BoundMemberTy || MemExprE->getType() == Context.OverloadTy" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12968, __PRETTY_FUNCTION__)); | ||||
12969 | |||||
12970 | // Dig out the member expression. This holds both the object | ||||
12971 | // argument and the member function we're referring to. | ||||
12972 | Expr *NakedMemExpr = MemExprE->IgnoreParens(); | ||||
12973 | |||||
12974 | // Determine whether this is a call to a pointer-to-member function. | ||||
12975 | if (BinaryOperator *op = dyn_cast<BinaryOperator>(NakedMemExpr)) { | ||||
12976 | assert(op->getType() == Context.BoundMemberTy)((op->getType() == Context.BoundMemberTy) ? static_cast< void> (0) : __assert_fail ("op->getType() == Context.BoundMemberTy" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12976, __PRETTY_FUNCTION__)); | ||||
12977 | assert(op->getOpcode() == BO_PtrMemD || op->getOpcode() == BO_PtrMemI)((op->getOpcode() == BO_PtrMemD || op->getOpcode() == BO_PtrMemI ) ? static_cast<void> (0) : __assert_fail ("op->getOpcode() == BO_PtrMemD || op->getOpcode() == BO_PtrMemI" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 12977, __PRETTY_FUNCTION__)); | ||||
12978 | |||||
12979 | QualType fnType = | ||||
12980 | op->getRHS()->getType()->castAs<MemberPointerType>()->getPointeeType(); | ||||
12981 | |||||
12982 | const FunctionProtoType *proto = fnType->castAs<FunctionProtoType>(); | ||||
12983 | QualType resultType = proto->getCallResultType(Context); | ||||
12984 | ExprValueKind valueKind = Expr::getValueKindForType(proto->getReturnType()); | ||||
12985 | |||||
12986 | // Check that the object type isn't more qualified than the | ||||
12987 | // member function we're calling. | ||||
12988 | Qualifiers funcQuals = proto->getMethodQuals(); | ||||
12989 | |||||
12990 | QualType objectType = op->getLHS()->getType(); | ||||
12991 | if (op->getOpcode() == BO_PtrMemI) | ||||
12992 | objectType = objectType->castAs<PointerType>()->getPointeeType(); | ||||
12993 | Qualifiers objectQuals = objectType.getQualifiers(); | ||||
12994 | |||||
12995 | Qualifiers difference = objectQuals - funcQuals; | ||||
12996 | difference.removeObjCGCAttr(); | ||||
12997 | difference.removeAddressSpace(); | ||||
12998 | if (difference) { | ||||
12999 | std::string qualsString = difference.getAsString(); | ||||
13000 | Diag(LParenLoc, diag::err_pointer_to_member_call_drops_quals) | ||||
13001 | << fnType.getUnqualifiedType() | ||||
13002 | << qualsString | ||||
13003 | << (qualsString.find(' ') == std::string::npos ? 1 : 2); | ||||
13004 | } | ||||
13005 | |||||
13006 | CXXMemberCallExpr *call = | ||||
13007 | CXXMemberCallExpr::Create(Context, MemExprE, Args, resultType, | ||||
13008 | valueKind, RParenLoc, proto->getNumParams()); | ||||
13009 | |||||
13010 | if (CheckCallReturnType(proto->getReturnType(), op->getRHS()->getBeginLoc(), | ||||
13011 | call, nullptr)) | ||||
13012 | return ExprError(); | ||||
13013 | |||||
13014 | if (ConvertArgumentsForCall(call, op, nullptr, proto, Args, RParenLoc)) | ||||
13015 | return ExprError(); | ||||
13016 | |||||
13017 | if (CheckOtherCall(call, proto)) | ||||
13018 | return ExprError(); | ||||
13019 | |||||
13020 | return MaybeBindToTemporary(call); | ||||
13021 | } | ||||
13022 | |||||
13023 | if (isa<CXXPseudoDestructorExpr>(NakedMemExpr)) | ||||
13024 | return CallExpr::Create(Context, MemExprE, Args, Context.VoidTy, VK_RValue, | ||||
13025 | RParenLoc); | ||||
13026 | |||||
13027 | UnbridgedCastsSet UnbridgedCasts; | ||||
13028 | if (checkArgPlaceholdersForOverload(*this, Args, UnbridgedCasts)) | ||||
13029 | return ExprError(); | ||||
13030 | |||||
13031 | MemberExpr *MemExpr; | ||||
13032 | CXXMethodDecl *Method = nullptr; | ||||
13033 | DeclAccessPair FoundDecl = DeclAccessPair::make(nullptr, AS_public); | ||||
13034 | NestedNameSpecifier *Qualifier = nullptr; | ||||
13035 | if (isa<MemberExpr>(NakedMemExpr)) { | ||||
13036 | MemExpr = cast<MemberExpr>(NakedMemExpr); | ||||
13037 | Method = cast<CXXMethodDecl>(MemExpr->getMemberDecl()); | ||||
13038 | FoundDecl = MemExpr->getFoundDecl(); | ||||
13039 | Qualifier = MemExpr->getQualifier(); | ||||
13040 | UnbridgedCasts.restore(); | ||||
13041 | } else { | ||||
13042 | UnresolvedMemberExpr *UnresExpr = cast<UnresolvedMemberExpr>(NakedMemExpr); | ||||
13043 | Qualifier = UnresExpr->getQualifier(); | ||||
13044 | |||||
13045 | QualType ObjectType = UnresExpr->getBaseType(); | ||||
13046 | Expr::Classification ObjectClassification | ||||
13047 | = UnresExpr->isArrow()? Expr::Classification::makeSimpleLValue() | ||||
13048 | : UnresExpr->getBase()->Classify(Context); | ||||
13049 | |||||
13050 | // Add overload candidates | ||||
13051 | OverloadCandidateSet CandidateSet(UnresExpr->getMemberLoc(), | ||||
13052 | OverloadCandidateSet::CSK_Normal); | ||||
13053 | |||||
13054 | // FIXME: avoid copy. | ||||
13055 | TemplateArgumentListInfo TemplateArgsBuffer, *TemplateArgs = nullptr; | ||||
13056 | if (UnresExpr->hasExplicitTemplateArgs()) { | ||||
13057 | UnresExpr->copyTemplateArgumentsInto(TemplateArgsBuffer); | ||||
13058 | TemplateArgs = &TemplateArgsBuffer; | ||||
13059 | } | ||||
13060 | |||||
13061 | for (UnresolvedMemberExpr::decls_iterator I = UnresExpr->decls_begin(), | ||||
13062 | E = UnresExpr->decls_end(); I != E; ++I) { | ||||
13063 | |||||
13064 | NamedDecl *Func = *I; | ||||
13065 | CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(Func->getDeclContext()); | ||||
13066 | if (isa<UsingShadowDecl>(Func)) | ||||
13067 | Func = cast<UsingShadowDecl>(Func)->getTargetDecl(); | ||||
13068 | |||||
13069 | |||||
13070 | // Microsoft supports direct constructor calls. | ||||
13071 | if (getLangOpts().MicrosoftExt && isa<CXXConstructorDecl>(Func)) { | ||||
13072 | AddOverloadCandidate(cast<CXXConstructorDecl>(Func), I.getPair(), Args, | ||||
13073 | CandidateSet, | ||||
13074 | /*SuppressUserConversions*/ false); | ||||
13075 | } else if ((Method = dyn_cast<CXXMethodDecl>(Func))) { | ||||
13076 | // If explicit template arguments were provided, we can't call a | ||||
13077 | // non-template member function. | ||||
13078 | if (TemplateArgs) | ||||
13079 | continue; | ||||
13080 | |||||
13081 | AddMethodCandidate(Method, I.getPair(), ActingDC, ObjectType, | ||||
13082 | ObjectClassification, Args, CandidateSet, | ||||
13083 | /*SuppressUserConversions=*/false); | ||||
13084 | } else { | ||||
13085 | AddMethodTemplateCandidate( | ||||
13086 | cast<FunctionTemplateDecl>(Func), I.getPair(), ActingDC, | ||||
13087 | TemplateArgs, ObjectType, ObjectClassification, Args, CandidateSet, | ||||
13088 | /*SuppressUserConversions=*/false); | ||||
13089 | } | ||||
13090 | } | ||||
13091 | |||||
13092 | DeclarationName DeclName = UnresExpr->getMemberName(); | ||||
13093 | |||||
13094 | UnbridgedCasts.restore(); | ||||
13095 | |||||
13096 | OverloadCandidateSet::iterator Best; | ||||
13097 | switch (CandidateSet.BestViableFunction(*this, UnresExpr->getBeginLoc(), | ||||
13098 | Best)) { | ||||
13099 | case OR_Success: | ||||
13100 | Method = cast<CXXMethodDecl>(Best->Function); | ||||
13101 | FoundDecl = Best->FoundDecl; | ||||
13102 | CheckUnresolvedMemberAccess(UnresExpr, Best->FoundDecl); | ||||
13103 | if (DiagnoseUseOfDecl(Best->FoundDecl, UnresExpr->getNameLoc())) | ||||
13104 | return ExprError(); | ||||
13105 | // If FoundDecl is different from Method (such as if one is a template | ||||
13106 | // and the other a specialization), make sure DiagnoseUseOfDecl is | ||||
13107 | // called on both. | ||||
13108 | // FIXME: This would be more comprehensively addressed by modifying | ||||
13109 | // DiagnoseUseOfDecl to accept both the FoundDecl and the decl | ||||
13110 | // being used. | ||||
13111 | if (Method != FoundDecl.getDecl() && | ||||
13112 | DiagnoseUseOfDecl(Method, UnresExpr->getNameLoc())) | ||||
13113 | return ExprError(); | ||||
13114 | break; | ||||
13115 | |||||
13116 | case OR_No_Viable_Function: | ||||
13117 | CandidateSet.NoteCandidates( | ||||
13118 | PartialDiagnosticAt( | ||||
13119 | UnresExpr->getMemberLoc(), | ||||
13120 | PDiag(diag::err_ovl_no_viable_member_function_in_call) | ||||
13121 | << DeclName << MemExprE->getSourceRange()), | ||||
13122 | *this, OCD_AllCandidates, Args); | ||||
13123 | // FIXME: Leaking incoming expressions! | ||||
13124 | return ExprError(); | ||||
13125 | |||||
13126 | case OR_Ambiguous: | ||||
13127 | CandidateSet.NoteCandidates( | ||||
13128 | PartialDiagnosticAt(UnresExpr->getMemberLoc(), | ||||
13129 | PDiag(diag::err_ovl_ambiguous_member_call) | ||||
13130 | << DeclName << MemExprE->getSourceRange()), | ||||
13131 | *this, OCD_AllCandidates, Args); | ||||
13132 | // FIXME: Leaking incoming expressions! | ||||
13133 | return ExprError(); | ||||
13134 | |||||
13135 | case OR_Deleted: | ||||
13136 | CandidateSet.NoteCandidates( | ||||
13137 | PartialDiagnosticAt(UnresExpr->getMemberLoc(), | ||||
13138 | PDiag(diag::err_ovl_deleted_member_call) | ||||
13139 | << DeclName << MemExprE->getSourceRange()), | ||||
13140 | *this, OCD_AllCandidates, Args); | ||||
13141 | // FIXME: Leaking incoming expressions! | ||||
13142 | return ExprError(); | ||||
13143 | } | ||||
13144 | |||||
13145 | MemExprE = FixOverloadedFunctionReference(MemExprE, FoundDecl, Method); | ||||
13146 | |||||
13147 | // If overload resolution picked a static member, build a | ||||
13148 | // non-member call based on that function. | ||||
13149 | if (Method->isStatic()) { | ||||
13150 | return BuildResolvedCallExpr(MemExprE, Method, LParenLoc, Args, | ||||
13151 | RParenLoc); | ||||
13152 | } | ||||
13153 | |||||
13154 | MemExpr = cast<MemberExpr>(MemExprE->IgnoreParens()); | ||||
13155 | } | ||||
13156 | |||||
13157 | QualType ResultType = Method->getReturnType(); | ||||
13158 | ExprValueKind VK = Expr::getValueKindForType(ResultType); | ||||
13159 | ResultType = ResultType.getNonLValueExprType(Context); | ||||
13160 | |||||
13161 | assert(Method && "Member call to something that isn't a method?")((Method && "Member call to something that isn't a method?" ) ? static_cast<void> (0) : __assert_fail ("Method && \"Member call to something that isn't a method?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13161, __PRETTY_FUNCTION__)); | ||||
13162 | const auto *Proto = Method->getType()->getAs<FunctionProtoType>(); | ||||
13163 | CXXMemberCallExpr *TheCall = | ||||
13164 | CXXMemberCallExpr::Create(Context, MemExprE, Args, ResultType, VK, | ||||
13165 | RParenLoc, Proto->getNumParams()); | ||||
13166 | |||||
13167 | // Check for a valid return type. | ||||
13168 | if (CheckCallReturnType(Method->getReturnType(), MemExpr->getMemberLoc(), | ||||
13169 | TheCall, Method)) | ||||
13170 | return ExprError(); | ||||
13171 | |||||
13172 | // Convert the object argument (for a non-static member function call). | ||||
13173 | // We only need to do this if there was actually an overload; otherwise | ||||
13174 | // it was done at lookup. | ||||
13175 | if (!Method->isStatic()) { | ||||
13176 | ExprResult ObjectArg = | ||||
13177 | PerformObjectArgumentInitialization(MemExpr->getBase(), Qualifier, | ||||
13178 | FoundDecl, Method); | ||||
13179 | if (ObjectArg.isInvalid()) | ||||
13180 | return ExprError(); | ||||
13181 | MemExpr->setBase(ObjectArg.get()); | ||||
13182 | } | ||||
13183 | |||||
13184 | // Convert the rest of the arguments | ||||
13185 | if (ConvertArgumentsForCall(TheCall, MemExpr, Method, Proto, Args, | ||||
13186 | RParenLoc)) | ||||
13187 | return ExprError(); | ||||
13188 | |||||
13189 | DiagnoseSentinelCalls(Method, LParenLoc, Args); | ||||
13190 | |||||
13191 | if (CheckFunctionCall(Method, TheCall, Proto)) | ||||
13192 | return ExprError(); | ||||
13193 | |||||
13194 | // In the case the method to call was not selected by the overloading | ||||
13195 | // resolution process, we still need to handle the enable_if attribute. Do | ||||
13196 | // that here, so it will not hide previous -- and more relevant -- errors. | ||||
13197 | if (auto *MemE = dyn_cast<MemberExpr>(NakedMemExpr)) { | ||||
13198 | if (const EnableIfAttr *Attr = CheckEnableIf(Method, Args, true)) { | ||||
13199 | Diag(MemE->getMemberLoc(), | ||||
13200 | diag::err_ovl_no_viable_member_function_in_call) | ||||
13201 | << Method << Method->getSourceRange(); | ||||
13202 | Diag(Method->getLocation(), | ||||
13203 | diag::note_ovl_candidate_disabled_by_function_cond_attr) | ||||
13204 | << Attr->getCond()->getSourceRange() << Attr->getMessage(); | ||||
13205 | return ExprError(); | ||||
13206 | } | ||||
13207 | } | ||||
13208 | |||||
13209 | if ((isa<CXXConstructorDecl>(CurContext) || | ||||
13210 | isa<CXXDestructorDecl>(CurContext)) && | ||||
13211 | TheCall->getMethodDecl()->isPure()) { | ||||
13212 | const CXXMethodDecl *MD = TheCall->getMethodDecl(); | ||||
13213 | |||||
13214 | if (isa<CXXThisExpr>(MemExpr->getBase()->IgnoreParenCasts()) && | ||||
13215 | MemExpr->performsVirtualDispatch(getLangOpts())) { | ||||
13216 | Diag(MemExpr->getBeginLoc(), | ||||
13217 | diag::warn_call_to_pure_virtual_member_function_from_ctor_dtor) | ||||
13218 | << MD->getDeclName() << isa<CXXDestructorDecl>(CurContext) | ||||
13219 | << MD->getParent()->getDeclName(); | ||||
13220 | |||||
13221 | Diag(MD->getBeginLoc(), diag::note_previous_decl) << MD->getDeclName(); | ||||
13222 | if (getLangOpts().AppleKext) | ||||
13223 | Diag(MemExpr->getBeginLoc(), diag::note_pure_qualified_call_kext) | ||||
13224 | << MD->getParent()->getDeclName() << MD->getDeclName(); | ||||
13225 | } | ||||
13226 | } | ||||
13227 | |||||
13228 | if (CXXDestructorDecl *DD = | ||||
13229 | dyn_cast<CXXDestructorDecl>(TheCall->getMethodDecl())) { | ||||
13230 | // a->A::f() doesn't go through the vtable, except in AppleKext mode. | ||||
13231 | bool CallCanBeVirtual = !MemExpr->hasQualifier() || getLangOpts().AppleKext; | ||||
13232 | CheckVirtualDtorCall(DD, MemExpr->getBeginLoc(), /*IsDelete=*/false, | ||||
13233 | CallCanBeVirtual, /*WarnOnNonAbstractTypes=*/true, | ||||
13234 | MemExpr->getMemberLoc()); | ||||
13235 | } | ||||
13236 | |||||
13237 | return MaybeBindToTemporary(TheCall); | ||||
13238 | } | ||||
13239 | |||||
13240 | /// BuildCallToObjectOfClassType - Build a call to an object of class | ||||
13241 | /// type (C++ [over.call.object]), which can end up invoking an | ||||
13242 | /// overloaded function call operator (@c operator()) or performing a | ||||
13243 | /// user-defined conversion on the object argument. | ||||
13244 | ExprResult | ||||
13245 | Sema::BuildCallToObjectOfClassType(Scope *S, Expr *Obj, | ||||
13246 | SourceLocation LParenLoc, | ||||
13247 | MultiExprArg Args, | ||||
13248 | SourceLocation RParenLoc) { | ||||
13249 | if (checkPlaceholderForOverload(*this, Obj)) | ||||
13250 | return ExprError(); | ||||
13251 | ExprResult Object = Obj; | ||||
13252 | |||||
13253 | UnbridgedCastsSet UnbridgedCasts; | ||||
13254 | if (checkArgPlaceholdersForOverload(*this, Args, UnbridgedCasts)) | ||||
13255 | return ExprError(); | ||||
13256 | |||||
13257 | assert(Object.get()->getType()->isRecordType() &&((Object.get()->getType()->isRecordType() && "Requires object type argument" ) ? static_cast<void> (0) : __assert_fail ("Object.get()->getType()->isRecordType() && \"Requires object type argument\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13258, __PRETTY_FUNCTION__)) | ||||
13258 | "Requires object type argument")((Object.get()->getType()->isRecordType() && "Requires object type argument" ) ? static_cast<void> (0) : __assert_fail ("Object.get()->getType()->isRecordType() && \"Requires object type argument\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13258, __PRETTY_FUNCTION__)); | ||||
13259 | const RecordType *Record = Object.get()->getType()->getAs<RecordType>(); | ||||
13260 | |||||
13261 | // C++ [over.call.object]p1: | ||||
13262 | // If the primary-expression E in the function call syntax | ||||
13263 | // evaluates to a class object of type "cv T", then the set of | ||||
13264 | // candidate functions includes at least the function call | ||||
13265 | // operators of T. The function call operators of T are obtained by | ||||
13266 | // ordinary lookup of the name operator() in the context of | ||||
13267 | // (E).operator(). | ||||
13268 | OverloadCandidateSet CandidateSet(LParenLoc, | ||||
13269 | OverloadCandidateSet::CSK_Operator); | ||||
13270 | DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(OO_Call); | ||||
13271 | |||||
13272 | if (RequireCompleteType(LParenLoc, Object.get()->getType(), | ||||
13273 | diag::err_incomplete_object_call, Object.get())) | ||||
13274 | return true; | ||||
13275 | |||||
13276 | LookupResult R(*this, OpName, LParenLoc, LookupOrdinaryName); | ||||
13277 | LookupQualifiedName(R, Record->getDecl()); | ||||
13278 | R.suppressDiagnostics(); | ||||
13279 | |||||
13280 | for (LookupResult::iterator Oper = R.begin(), OperEnd = R.end(); | ||||
13281 | Oper != OperEnd; ++Oper) { | ||||
13282 | AddMethodCandidate(Oper.getPair(), Object.get()->getType(), | ||||
13283 | Object.get()->Classify(Context), Args, CandidateSet, | ||||
13284 | /*SuppressUserConversion=*/false); | ||||
13285 | } | ||||
13286 | |||||
13287 | // C++ [over.call.object]p2: | ||||
13288 | // In addition, for each (non-explicit in C++0x) conversion function | ||||
13289 | // declared in T of the form | ||||
13290 | // | ||||
13291 | // operator conversion-type-id () cv-qualifier; | ||||
13292 | // | ||||
13293 | // where cv-qualifier is the same cv-qualification as, or a | ||||
13294 | // greater cv-qualification than, cv, and where conversion-type-id | ||||
13295 | // denotes the type "pointer to function of (P1,...,Pn) returning | ||||
13296 | // R", or the type "reference to pointer to function of | ||||
13297 | // (P1,...,Pn) returning R", or the type "reference to function | ||||
13298 | // of (P1,...,Pn) returning R", a surrogate call function [...] | ||||
13299 | // is also considered as a candidate function. Similarly, | ||||
13300 | // surrogate call functions are added to the set of candidate | ||||
13301 | // functions for each conversion function declared in an | ||||
13302 | // accessible base class provided the function is not hidden | ||||
13303 | // within T by another intervening declaration. | ||||
13304 | const auto &Conversions = | ||||
13305 | cast<CXXRecordDecl>(Record->getDecl())->getVisibleConversionFunctions(); | ||||
13306 | for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) { | ||||
13307 | NamedDecl *D = *I; | ||||
13308 | CXXRecordDecl *ActingContext = cast<CXXRecordDecl>(D->getDeclContext()); | ||||
13309 | if (isa<UsingShadowDecl>(D)) | ||||
13310 | D = cast<UsingShadowDecl>(D)->getTargetDecl(); | ||||
13311 | |||||
13312 | // Skip over templated conversion functions; they aren't | ||||
13313 | // surrogates. | ||||
13314 | if (isa<FunctionTemplateDecl>(D)) | ||||
13315 | continue; | ||||
13316 | |||||
13317 | CXXConversionDecl *Conv = cast<CXXConversionDecl>(D); | ||||
13318 | if (!Conv->isExplicit()) { | ||||
13319 | // Strip the reference type (if any) and then the pointer type (if | ||||
13320 | // any) to get down to what might be a function type. | ||||
13321 | QualType ConvType = Conv->getConversionType().getNonReferenceType(); | ||||
13322 | if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>()) | ||||
13323 | ConvType = ConvPtrType->getPointeeType(); | ||||
13324 | |||||
13325 | if (const FunctionProtoType *Proto = ConvType->getAs<FunctionProtoType>()) | ||||
13326 | { | ||||
13327 | AddSurrogateCandidate(Conv, I.getPair(), ActingContext, Proto, | ||||
13328 | Object.get(), Args, CandidateSet); | ||||
13329 | } | ||||
13330 | } | ||||
13331 | } | ||||
13332 | |||||
13333 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | ||||
13334 | |||||
13335 | // Perform overload resolution. | ||||
13336 | OverloadCandidateSet::iterator Best; | ||||
13337 | switch (CandidateSet.BestViableFunction(*this, Object.get()->getBeginLoc(), | ||||
13338 | Best)) { | ||||
13339 | case OR_Success: | ||||
13340 | // Overload resolution succeeded; we'll build the appropriate call | ||||
13341 | // below. | ||||
13342 | break; | ||||
13343 | |||||
13344 | case OR_No_Viable_Function: { | ||||
13345 | PartialDiagnostic PD = | ||||
13346 | CandidateSet.empty() | ||||
13347 | ? (PDiag(diag::err_ovl_no_oper) | ||||
13348 | << Object.get()->getType() << /*call*/ 1 | ||||
13349 | << Object.get()->getSourceRange()) | ||||
13350 | : (PDiag(diag::err_ovl_no_viable_object_call) | ||||
13351 | << Object.get()->getType() << Object.get()->getSourceRange()); | ||||
13352 | CandidateSet.NoteCandidates( | ||||
13353 | PartialDiagnosticAt(Object.get()->getBeginLoc(), PD), *this, | ||||
13354 | OCD_AllCandidates, Args); | ||||
13355 | break; | ||||
13356 | } | ||||
13357 | case OR_Ambiguous: | ||||
13358 | CandidateSet.NoteCandidates( | ||||
13359 | PartialDiagnosticAt(Object.get()->getBeginLoc(), | ||||
13360 | PDiag(diag::err_ovl_ambiguous_object_call) | ||||
13361 | << Object.get()->getType() | ||||
13362 | << Object.get()->getSourceRange()), | ||||
13363 | *this, OCD_ViableCandidates, Args); | ||||
13364 | break; | ||||
13365 | |||||
13366 | case OR_Deleted: | ||||
13367 | CandidateSet.NoteCandidates( | ||||
13368 | PartialDiagnosticAt(Object.get()->getBeginLoc(), | ||||
13369 | PDiag(diag::err_ovl_deleted_object_call) | ||||
13370 | << Object.get()->getType() | ||||
13371 | << Object.get()->getSourceRange()), | ||||
13372 | *this, OCD_AllCandidates, Args); | ||||
13373 | break; | ||||
13374 | } | ||||
13375 | |||||
13376 | if (Best == CandidateSet.end()) | ||||
13377 | return true; | ||||
13378 | |||||
13379 | UnbridgedCasts.restore(); | ||||
13380 | |||||
13381 | if (Best->Function == nullptr) { | ||||
13382 | // Since there is no function declaration, this is one of the | ||||
13383 | // surrogate candidates. Dig out the conversion function. | ||||
13384 | CXXConversionDecl *Conv | ||||
13385 | = cast<CXXConversionDecl>( | ||||
13386 | Best->Conversions[0].UserDefined.ConversionFunction); | ||||
13387 | |||||
13388 | CheckMemberOperatorAccess(LParenLoc, Object.get(), nullptr, | ||||
13389 | Best->FoundDecl); | ||||
13390 | if (DiagnoseUseOfDecl(Best->FoundDecl, LParenLoc)) | ||||
13391 | return ExprError(); | ||||
13392 | assert(Conv == Best->FoundDecl.getDecl() &&((Conv == Best->FoundDecl.getDecl() && "Found Decl & conversion-to-functionptr should be same, right?!" ) ? static_cast<void> (0) : __assert_fail ("Conv == Best->FoundDecl.getDecl() && \"Found Decl & conversion-to-functionptr should be same, right?!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13393, __PRETTY_FUNCTION__)) | ||||
13393 | "Found Decl & conversion-to-functionptr should be same, right?!")((Conv == Best->FoundDecl.getDecl() && "Found Decl & conversion-to-functionptr should be same, right?!" ) ? static_cast<void> (0) : __assert_fail ("Conv == Best->FoundDecl.getDecl() && \"Found Decl & conversion-to-functionptr should be same, right?!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13393, __PRETTY_FUNCTION__)); | ||||
13394 | // We selected one of the surrogate functions that converts the | ||||
13395 | // object parameter to a function pointer. Perform the conversion | ||||
13396 | // on the object argument, then let BuildCallExpr finish the job. | ||||
13397 | |||||
13398 | // Create an implicit member expr to refer to the conversion operator. | ||||
13399 | // and then call it. | ||||
13400 | ExprResult Call = BuildCXXMemberCallExpr(Object.get(), Best->FoundDecl, | ||||
13401 | Conv, HadMultipleCandidates); | ||||
13402 | if (Call.isInvalid()) | ||||
13403 | return ExprError(); | ||||
13404 | // Record usage of conversion in an implicit cast. | ||||
13405 | Call = ImplicitCastExpr::Create(Context, Call.get()->getType(), | ||||
13406 | CK_UserDefinedConversion, Call.get(), | ||||
13407 | nullptr, VK_RValue); | ||||
13408 | |||||
13409 | return BuildCallExpr(S, Call.get(), LParenLoc, Args, RParenLoc); | ||||
13410 | } | ||||
13411 | |||||
13412 | CheckMemberOperatorAccess(LParenLoc, Object.get(), nullptr, Best->FoundDecl); | ||||
13413 | |||||
13414 | // We found an overloaded operator(). Build a CXXOperatorCallExpr | ||||
13415 | // that calls this method, using Object for the implicit object | ||||
13416 | // parameter and passing along the remaining arguments. | ||||
13417 | CXXMethodDecl *Method = cast<CXXMethodDecl>(Best->Function); | ||||
13418 | |||||
13419 | // An error diagnostic has already been printed when parsing the declaration. | ||||
13420 | if (Method->isInvalidDecl()) | ||||
13421 | return ExprError(); | ||||
13422 | |||||
13423 | const FunctionProtoType *Proto = | ||||
13424 | Method->getType()->getAs<FunctionProtoType>(); | ||||
13425 | |||||
13426 | unsigned NumParams = Proto->getNumParams(); | ||||
13427 | |||||
13428 | DeclarationNameInfo OpLocInfo( | ||||
13429 | Context.DeclarationNames.getCXXOperatorName(OO_Call), LParenLoc); | ||||
13430 | OpLocInfo.setCXXOperatorNameRange(SourceRange(LParenLoc, RParenLoc)); | ||||
13431 | ExprResult NewFn = CreateFunctionRefExpr(*this, Method, Best->FoundDecl, | ||||
13432 | Obj, HadMultipleCandidates, | ||||
13433 | OpLocInfo.getLoc(), | ||||
13434 | OpLocInfo.getInfo()); | ||||
13435 | if (NewFn.isInvalid()) | ||||
13436 | return true; | ||||
13437 | |||||
13438 | // The number of argument slots to allocate in the call. If we have default | ||||
13439 | // arguments we need to allocate space for them as well. We additionally | ||||
13440 | // need one more slot for the object parameter. | ||||
13441 | unsigned NumArgsSlots = 1 + std::max<unsigned>(Args.size(), NumParams); | ||||
13442 | |||||
13443 | // Build the full argument list for the method call (the implicit object | ||||
13444 | // parameter is placed at the beginning of the list). | ||||
13445 | SmallVector<Expr *, 8> MethodArgs(NumArgsSlots); | ||||
13446 | |||||
13447 | bool IsError = false; | ||||
13448 | |||||
13449 | // Initialize the implicit object parameter. | ||||
13450 | ExprResult ObjRes = | ||||
13451 | PerformObjectArgumentInitialization(Object.get(), /*Qualifier=*/nullptr, | ||||
13452 | Best->FoundDecl, Method); | ||||
13453 | if (ObjRes.isInvalid()) | ||||
13454 | IsError = true; | ||||
13455 | else | ||||
13456 | Object = ObjRes; | ||||
13457 | MethodArgs[0] = Object.get(); | ||||
13458 | |||||
13459 | // Check the argument types. | ||||
13460 | for (unsigned i = 0; i != NumParams; i++) { | ||||
13461 | Expr *Arg; | ||||
13462 | if (i < Args.size()) { | ||||
13463 | Arg = Args[i]; | ||||
13464 | |||||
13465 | // Pass the argument. | ||||
13466 | |||||
13467 | ExprResult InputInit | ||||
13468 | = PerformCopyInitialization(InitializedEntity::InitializeParameter( | ||||
13469 | Context, | ||||
13470 | Method->getParamDecl(i)), | ||||
13471 | SourceLocation(), Arg); | ||||
13472 | |||||
13473 | IsError |= InputInit.isInvalid(); | ||||
13474 | Arg = InputInit.getAs<Expr>(); | ||||
13475 | } else { | ||||
13476 | ExprResult DefArg | ||||
13477 | = BuildCXXDefaultArgExpr(LParenLoc, Method, Method->getParamDecl(i)); | ||||
13478 | if (DefArg.isInvalid()) { | ||||
13479 | IsError = true; | ||||
13480 | break; | ||||
13481 | } | ||||
13482 | |||||
13483 | Arg = DefArg.getAs<Expr>(); | ||||
13484 | } | ||||
13485 | |||||
13486 | MethodArgs[i + 1] = Arg; | ||||
13487 | } | ||||
13488 | |||||
13489 | // If this is a variadic call, handle args passed through "...". | ||||
13490 | if (Proto->isVariadic()) { | ||||
13491 | // Promote the arguments (C99 6.5.2.2p7). | ||||
13492 | for (unsigned i = NumParams, e = Args.size(); i < e; i++) { | ||||
13493 | ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, | ||||
13494 | nullptr); | ||||
13495 | IsError |= Arg.isInvalid(); | ||||
13496 | MethodArgs[i + 1] = Arg.get(); | ||||
13497 | } | ||||
13498 | } | ||||
13499 | |||||
13500 | if (IsError) | ||||
13501 | return true; | ||||
13502 | |||||
13503 | DiagnoseSentinelCalls(Method, LParenLoc, Args); | ||||
13504 | |||||
13505 | // Once we've built TheCall, all of the expressions are properly owned. | ||||
13506 | QualType ResultTy = Method->getReturnType(); | ||||
13507 | ExprValueKind VK = Expr::getValueKindForType(ResultTy); | ||||
13508 | ResultTy = ResultTy.getNonLValueExprType(Context); | ||||
13509 | |||||
13510 | CXXOperatorCallExpr *TheCall = | ||||
13511 | CXXOperatorCallExpr::Create(Context, OO_Call, NewFn.get(), MethodArgs, | ||||
13512 | ResultTy, VK, RParenLoc, FPOptions()); | ||||
13513 | |||||
13514 | if (CheckCallReturnType(Method->getReturnType(), LParenLoc, TheCall, Method)) | ||||
13515 | return true; | ||||
13516 | |||||
13517 | if (CheckFunctionCall(Method, TheCall, Proto)) | ||||
13518 | return true; | ||||
13519 | |||||
13520 | return MaybeBindToTemporary(TheCall); | ||||
13521 | } | ||||
13522 | |||||
13523 | /// BuildOverloadedArrowExpr - Build a call to an overloaded @c operator-> | ||||
13524 | /// (if one exists), where @c Base is an expression of class type and | ||||
13525 | /// @c Member is the name of the member we're trying to find. | ||||
13526 | ExprResult | ||||
13527 | Sema::BuildOverloadedArrowExpr(Scope *S, Expr *Base, SourceLocation OpLoc, | ||||
13528 | bool *NoArrowOperatorFound) { | ||||
13529 | assert(Base->getType()->isRecordType() &&((Base->getType()->isRecordType() && "left-hand side must have class type" ) ? static_cast<void> (0) : __assert_fail ("Base->getType()->isRecordType() && \"left-hand side must have class type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13530, __PRETTY_FUNCTION__)) | ||||
13530 | "left-hand side must have class type")((Base->getType()->isRecordType() && "left-hand side must have class type" ) ? static_cast<void> (0) : __assert_fail ("Base->getType()->isRecordType() && \"left-hand side must have class type\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13530, __PRETTY_FUNCTION__)); | ||||
13531 | |||||
13532 | if (checkPlaceholderForOverload(*this, Base)) | ||||
13533 | return ExprError(); | ||||
13534 | |||||
13535 | SourceLocation Loc = Base->getExprLoc(); | ||||
13536 | |||||
13537 | // C++ [over.ref]p1: | ||||
13538 | // | ||||
13539 | // [...] An expression x->m is interpreted as (x.operator->())->m | ||||
13540 | // for a class object x of type T if T::operator->() exists and if | ||||
13541 | // the operator is selected as the best match function by the | ||||
13542 | // overload resolution mechanism (13.3). | ||||
13543 | DeclarationName OpName = | ||||
13544 | Context.DeclarationNames.getCXXOperatorName(OO_Arrow); | ||||
13545 | OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Operator); | ||||
13546 | const RecordType *BaseRecord = Base->getType()->getAs<RecordType>(); | ||||
13547 | |||||
13548 | if (RequireCompleteType(Loc, Base->getType(), | ||||
13549 | diag::err_typecheck_incomplete_tag, Base)) | ||||
13550 | return ExprError(); | ||||
13551 | |||||
13552 | LookupResult R(*this, OpName, OpLoc, LookupOrdinaryName); | ||||
13553 | LookupQualifiedName(R, BaseRecord->getDecl()); | ||||
13554 | R.suppressDiagnostics(); | ||||
13555 | |||||
13556 | for (LookupResult::iterator Oper = R.begin(), OperEnd = R.end(); | ||||
13557 | Oper != OperEnd; ++Oper) { | ||||
13558 | AddMethodCandidate(Oper.getPair(), Base->getType(), Base->Classify(Context), | ||||
13559 | None, CandidateSet, /*SuppressUserConversion=*/false); | ||||
13560 | } | ||||
13561 | |||||
13562 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | ||||
13563 | |||||
13564 | // Perform overload resolution. | ||||
13565 | OverloadCandidateSet::iterator Best; | ||||
13566 | switch (CandidateSet.BestViableFunction(*this, OpLoc, Best)) { | ||||
13567 | case OR_Success: | ||||
13568 | // Overload resolution succeeded; we'll build the call below. | ||||
13569 | break; | ||||
13570 | |||||
13571 | case OR_No_Viable_Function: { | ||||
13572 | auto Cands = CandidateSet.CompleteCandidates(*this, OCD_AllCandidates, Base); | ||||
13573 | if (CandidateSet.empty()) { | ||||
13574 | QualType BaseType = Base->getType(); | ||||
13575 | if (NoArrowOperatorFound) { | ||||
13576 | // Report this specific error to the caller instead of emitting a | ||||
13577 | // diagnostic, as requested. | ||||
13578 | *NoArrowOperatorFound = true; | ||||
13579 | return ExprError(); | ||||
13580 | } | ||||
13581 | Diag(OpLoc, diag::err_typecheck_member_reference_arrow) | ||||
13582 | << BaseType << Base->getSourceRange(); | ||||
13583 | if (BaseType->isRecordType() && !BaseType->isPointerType()) { | ||||
13584 | Diag(OpLoc, diag::note_typecheck_member_reference_suggestion) | ||||
13585 | << FixItHint::CreateReplacement(OpLoc, "."); | ||||
13586 | } | ||||
13587 | } else | ||||
13588 | Diag(OpLoc, diag::err_ovl_no_viable_oper) | ||||
13589 | << "operator->" << Base->getSourceRange(); | ||||
13590 | CandidateSet.NoteCandidates(*this, Base, Cands); | ||||
13591 | return ExprError(); | ||||
13592 | } | ||||
13593 | case OR_Ambiguous: | ||||
13594 | CandidateSet.NoteCandidates( | ||||
13595 | PartialDiagnosticAt(OpLoc, PDiag(diag::err_ovl_ambiguous_oper_unary) | ||||
13596 | << "->" << Base->getType() | ||||
13597 | << Base->getSourceRange()), | ||||
13598 | *this, OCD_ViableCandidates, Base); | ||||
13599 | return ExprError(); | ||||
13600 | |||||
13601 | case OR_Deleted: | ||||
13602 | CandidateSet.NoteCandidates( | ||||
13603 | PartialDiagnosticAt(OpLoc, PDiag(diag::err_ovl_deleted_oper) | ||||
13604 | << "->" << Base->getSourceRange()), | ||||
13605 | *this, OCD_AllCandidates, Base); | ||||
13606 | return ExprError(); | ||||
13607 | } | ||||
13608 | |||||
13609 | CheckMemberOperatorAccess(OpLoc, Base, nullptr, Best->FoundDecl); | ||||
13610 | |||||
13611 | // Convert the object parameter. | ||||
13612 | CXXMethodDecl *Method = cast<CXXMethodDecl>(Best->Function); | ||||
13613 | ExprResult BaseResult = | ||||
13614 | PerformObjectArgumentInitialization(Base, /*Qualifier=*/nullptr, | ||||
13615 | Best->FoundDecl, Method); | ||||
13616 | if (BaseResult.isInvalid()) | ||||
13617 | return ExprError(); | ||||
13618 | Base = BaseResult.get(); | ||||
13619 | |||||
13620 | // Build the operator call. | ||||
13621 | ExprResult FnExpr = CreateFunctionRefExpr(*this, Method, Best->FoundDecl, | ||||
13622 | Base, HadMultipleCandidates, OpLoc); | ||||
13623 | if (FnExpr.isInvalid()) | ||||
13624 | return ExprError(); | ||||
13625 | |||||
13626 | QualType ResultTy = Method->getReturnType(); | ||||
13627 | ExprValueKind VK = Expr::getValueKindForType(ResultTy); | ||||
13628 | ResultTy = ResultTy.getNonLValueExprType(Context); | ||||
13629 | CXXOperatorCallExpr *TheCall = CXXOperatorCallExpr::Create( | ||||
13630 | Context, OO_Arrow, FnExpr.get(), Base, ResultTy, VK, OpLoc, FPOptions()); | ||||
13631 | |||||
13632 | if (CheckCallReturnType(Method->getReturnType(), OpLoc, TheCall, Method)) | ||||
13633 | return ExprError(); | ||||
13634 | |||||
13635 | if (CheckFunctionCall(Method, TheCall, | ||||
13636 | Method->getType()->castAs<FunctionProtoType>())) | ||||
13637 | return ExprError(); | ||||
13638 | |||||
13639 | return MaybeBindToTemporary(TheCall); | ||||
13640 | } | ||||
13641 | |||||
13642 | /// BuildLiteralOperatorCall - Build a UserDefinedLiteral by creating a call to | ||||
13643 | /// a literal operator described by the provided lookup results. | ||||
13644 | ExprResult Sema::BuildLiteralOperatorCall(LookupResult &R, | ||||
13645 | DeclarationNameInfo &SuffixInfo, | ||||
13646 | ArrayRef<Expr*> Args, | ||||
13647 | SourceLocation LitEndLoc, | ||||
13648 | TemplateArgumentListInfo *TemplateArgs) { | ||||
13649 | SourceLocation UDSuffixLoc = SuffixInfo.getCXXLiteralOperatorNameLoc(); | ||||
13650 | |||||
13651 | OverloadCandidateSet CandidateSet(UDSuffixLoc, | ||||
13652 | OverloadCandidateSet::CSK_Normal); | ||||
13653 | AddFunctionCandidates(R.asUnresolvedSet(), Args, CandidateSet, TemplateArgs, | ||||
13654 | /*SuppressUserConversions=*/true); | ||||
13655 | |||||
13656 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | ||||
13657 | |||||
13658 | // Perform overload resolution. This will usually be trivial, but might need | ||||
13659 | // to perform substitutions for a literal operator template. | ||||
13660 | OverloadCandidateSet::iterator Best; | ||||
13661 | switch (CandidateSet.BestViableFunction(*this, UDSuffixLoc, Best)) { | ||||
13662 | case OR_Success: | ||||
13663 | case OR_Deleted: | ||||
13664 | break; | ||||
13665 | |||||
13666 | case OR_No_Viable_Function: | ||||
13667 | CandidateSet.NoteCandidates( | ||||
13668 | PartialDiagnosticAt(UDSuffixLoc, | ||||
13669 | PDiag(diag::err_ovl_no_viable_function_in_call) | ||||
13670 | << R.getLookupName()), | ||||
13671 | *this, OCD_AllCandidates, Args); | ||||
13672 | return ExprError(); | ||||
13673 | |||||
13674 | case OR_Ambiguous: | ||||
13675 | CandidateSet.NoteCandidates( | ||||
13676 | PartialDiagnosticAt(R.getNameLoc(), PDiag(diag::err_ovl_ambiguous_call) | ||||
13677 | << R.getLookupName()), | ||||
13678 | *this, OCD_ViableCandidates, Args); | ||||
13679 | return ExprError(); | ||||
13680 | } | ||||
13681 | |||||
13682 | FunctionDecl *FD = Best->Function; | ||||
13683 | ExprResult Fn = CreateFunctionRefExpr(*this, FD, Best->FoundDecl, | ||||
13684 | nullptr, HadMultipleCandidates, | ||||
13685 | SuffixInfo.getLoc(), | ||||
13686 | SuffixInfo.getInfo()); | ||||
13687 | if (Fn.isInvalid()) | ||||
13688 | return true; | ||||
13689 | |||||
13690 | // Check the argument types. This should almost always be a no-op, except | ||||
13691 | // that array-to-pointer decay is applied to string literals. | ||||
13692 | Expr *ConvArgs[2]; | ||||
13693 | for (unsigned ArgIdx = 0, N = Args.size(); ArgIdx != N; ++ArgIdx) { | ||||
13694 | ExprResult InputInit = PerformCopyInitialization( | ||||
13695 | InitializedEntity::InitializeParameter(Context, FD->getParamDecl(ArgIdx)), | ||||
13696 | SourceLocation(), Args[ArgIdx]); | ||||
13697 | if (InputInit.isInvalid()) | ||||
13698 | return true; | ||||
13699 | ConvArgs[ArgIdx] = InputInit.get(); | ||||
13700 | } | ||||
13701 | |||||
13702 | QualType ResultTy = FD->getReturnType(); | ||||
13703 | ExprValueKind VK = Expr::getValueKindForType(ResultTy); | ||||
13704 | ResultTy = ResultTy.getNonLValueExprType(Context); | ||||
13705 | |||||
13706 | UserDefinedLiteral *UDL = UserDefinedLiteral::Create( | ||||
13707 | Context, Fn.get(), llvm::makeArrayRef(ConvArgs, Args.size()), ResultTy, | ||||
13708 | VK, LitEndLoc, UDSuffixLoc); | ||||
13709 | |||||
13710 | if (CheckCallReturnType(FD->getReturnType(), UDSuffixLoc, UDL, FD)) | ||||
13711 | return ExprError(); | ||||
13712 | |||||
13713 | if (CheckFunctionCall(FD, UDL, nullptr)) | ||||
13714 | return ExprError(); | ||||
13715 | |||||
13716 | return MaybeBindToTemporary(UDL); | ||||
13717 | } | ||||
13718 | |||||
13719 | /// Build a call to 'begin' or 'end' for a C++11 for-range statement. If the | ||||
13720 | /// given LookupResult is non-empty, it is assumed to describe a member which | ||||
13721 | /// will be invoked. Otherwise, the function will be found via argument | ||||
13722 | /// dependent lookup. | ||||
13723 | /// CallExpr is set to a valid expression and FRS_Success returned on success, | ||||
13724 | /// otherwise CallExpr is set to ExprError() and some non-success value | ||||
13725 | /// is returned. | ||||
13726 | Sema::ForRangeStatus | ||||
13727 | Sema::BuildForRangeBeginEndCall(SourceLocation Loc, | ||||
13728 | SourceLocation RangeLoc, | ||||
13729 | const DeclarationNameInfo &NameInfo, | ||||
13730 | LookupResult &MemberLookup, | ||||
13731 | OverloadCandidateSet *CandidateSet, | ||||
13732 | Expr *Range, ExprResult *CallExpr) { | ||||
13733 | Scope *S = nullptr; | ||||
13734 | |||||
13735 | CandidateSet->clear(OverloadCandidateSet::CSK_Normal); | ||||
13736 | if (!MemberLookup.empty()) { | ||||
13737 | ExprResult MemberRef = | ||||
13738 | BuildMemberReferenceExpr(Range, Range->getType(), Loc, | ||||
13739 | /*IsPtr=*/false, CXXScopeSpec(), | ||||
13740 | /*TemplateKWLoc=*/SourceLocation(), | ||||
13741 | /*FirstQualifierInScope=*/nullptr, | ||||
13742 | MemberLookup, | ||||
13743 | /*TemplateArgs=*/nullptr, S); | ||||
13744 | if (MemberRef.isInvalid()) { | ||||
13745 | *CallExpr = ExprError(); | ||||
13746 | return FRS_DiagnosticIssued; | ||||
13747 | } | ||||
13748 | *CallExpr = BuildCallExpr(S, MemberRef.get(), Loc, None, Loc, nullptr); | ||||
13749 | if (CallExpr->isInvalid()) { | ||||
13750 | *CallExpr = ExprError(); | ||||
13751 | return FRS_DiagnosticIssued; | ||||
13752 | } | ||||
13753 | } else { | ||||
13754 | UnresolvedSet<0> FoundNames; | ||||
13755 | UnresolvedLookupExpr *Fn = | ||||
13756 | UnresolvedLookupExpr::Create(Context, /*NamingClass=*/nullptr, | ||||
13757 | NestedNameSpecifierLoc(), NameInfo, | ||||
13758 | /*NeedsADL=*/true, /*Overloaded=*/false, | ||||
13759 | FoundNames.begin(), FoundNames.end()); | ||||
13760 | |||||
13761 | bool CandidateSetError = buildOverloadedCallSet(S, Fn, Fn, Range, Loc, | ||||
13762 | CandidateSet, CallExpr); | ||||
13763 | if (CandidateSet->empty() || CandidateSetError) { | ||||
13764 | *CallExpr = ExprError(); | ||||
13765 | return FRS_NoViableFunction; | ||||
13766 | } | ||||
13767 | OverloadCandidateSet::iterator Best; | ||||
13768 | OverloadingResult OverloadResult = | ||||
13769 | CandidateSet->BestViableFunction(*this, Fn->getBeginLoc(), Best); | ||||
13770 | |||||
13771 | if (OverloadResult == OR_No_Viable_Function) { | ||||
13772 | *CallExpr = ExprError(); | ||||
13773 | return FRS_NoViableFunction; | ||||
13774 | } | ||||
13775 | *CallExpr = FinishOverloadedCallExpr(*this, S, Fn, Fn, Loc, Range, | ||||
13776 | Loc, nullptr, CandidateSet, &Best, | ||||
13777 | OverloadResult, | ||||
13778 | /*AllowTypoCorrection=*/false); | ||||
13779 | if (CallExpr->isInvalid() || OverloadResult != OR_Success) { | ||||
13780 | *CallExpr = ExprError(); | ||||
13781 | return FRS_DiagnosticIssued; | ||||
13782 | } | ||||
13783 | } | ||||
13784 | return FRS_Success; | ||||
13785 | } | ||||
13786 | |||||
13787 | |||||
13788 | /// FixOverloadedFunctionReference - E is an expression that refers to | ||||
13789 | /// a C++ overloaded function (possibly with some parentheses and | ||||
13790 | /// perhaps a '&' around it). We have resolved the overloaded function | ||||
13791 | /// to the function declaration Fn, so patch up the expression E to | ||||
13792 | /// refer (possibly indirectly) to Fn. Returns the new expr. | ||||
13793 | Expr *Sema::FixOverloadedFunctionReference(Expr *E, DeclAccessPair Found, | ||||
13794 | FunctionDecl *Fn) { | ||||
13795 | if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) { | ||||
13796 | Expr *SubExpr = FixOverloadedFunctionReference(PE->getSubExpr(), | ||||
13797 | Found, Fn); | ||||
13798 | if (SubExpr == PE->getSubExpr()) | ||||
13799 | return PE; | ||||
13800 | |||||
13801 | return new (Context) ParenExpr(PE->getLParen(), PE->getRParen(), SubExpr); | ||||
13802 | } | ||||
13803 | |||||
13804 | if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { | ||||
13805 | Expr *SubExpr = FixOverloadedFunctionReference(ICE->getSubExpr(), | ||||
13806 | Found, Fn); | ||||
13807 | assert(Context.hasSameType(ICE->getSubExpr()->getType(),((Context.hasSameType(ICE->getSubExpr()->getType(), SubExpr ->getType()) && "Implicit cast type cannot be determined from overload" ) ? static_cast<void> (0) : __assert_fail ("Context.hasSameType(ICE->getSubExpr()->getType(), SubExpr->getType()) && \"Implicit cast type cannot be determined from overload\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13809, __PRETTY_FUNCTION__)) | ||||
13808 | SubExpr->getType()) &&((Context.hasSameType(ICE->getSubExpr()->getType(), SubExpr ->getType()) && "Implicit cast type cannot be determined from overload" ) ? static_cast<void> (0) : __assert_fail ("Context.hasSameType(ICE->getSubExpr()->getType(), SubExpr->getType()) && \"Implicit cast type cannot be determined from overload\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13809, __PRETTY_FUNCTION__)) | ||||
13809 | "Implicit cast type cannot be determined from overload")((Context.hasSameType(ICE->getSubExpr()->getType(), SubExpr ->getType()) && "Implicit cast type cannot be determined from overload" ) ? static_cast<void> (0) : __assert_fail ("Context.hasSameType(ICE->getSubExpr()->getType(), SubExpr->getType()) && \"Implicit cast type cannot be determined from overload\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13809, __PRETTY_FUNCTION__)); | ||||
13810 | assert(ICE->path_empty() && "fixing up hierarchy conversion?")((ICE->path_empty() && "fixing up hierarchy conversion?" ) ? static_cast<void> (0) : __assert_fail ("ICE->path_empty() && \"fixing up hierarchy conversion?\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13810, __PRETTY_FUNCTION__)); | ||||
13811 | if (SubExpr == ICE->getSubExpr()) | ||||
13812 | return ICE; | ||||
13813 | |||||
13814 | return ImplicitCastExpr::Create(Context, ICE->getType(), | ||||
13815 | ICE->getCastKind(), | ||||
13816 | SubExpr, nullptr, | ||||
13817 | ICE->getValueKind()); | ||||
13818 | } | ||||
13819 | |||||
13820 | if (auto *GSE = dyn_cast<GenericSelectionExpr>(E)) { | ||||
13821 | if (!GSE->isResultDependent()) { | ||||
13822 | Expr *SubExpr = | ||||
13823 | FixOverloadedFunctionReference(GSE->getResultExpr(), Found, Fn); | ||||
13824 | if (SubExpr == GSE->getResultExpr()) | ||||
13825 | return GSE; | ||||
13826 | |||||
13827 | // Replace the resulting type information before rebuilding the generic | ||||
13828 | // selection expression. | ||||
13829 | ArrayRef<Expr *> A = GSE->getAssocExprs(); | ||||
13830 | SmallVector<Expr *, 4> AssocExprs(A.begin(), A.end()); | ||||
13831 | unsigned ResultIdx = GSE->getResultIndex(); | ||||
13832 | AssocExprs[ResultIdx] = SubExpr; | ||||
13833 | |||||
13834 | return GenericSelectionExpr::Create( | ||||
13835 | Context, GSE->getGenericLoc(), GSE->getControllingExpr(), | ||||
13836 | GSE->getAssocTypeSourceInfos(), AssocExprs, GSE->getDefaultLoc(), | ||||
13837 | GSE->getRParenLoc(), GSE->containsUnexpandedParameterPack(), | ||||
13838 | ResultIdx); | ||||
13839 | } | ||||
13840 | // Rather than fall through to the unreachable, return the original generic | ||||
13841 | // selection expression. | ||||
13842 | return GSE; | ||||
13843 | } | ||||
13844 | |||||
13845 | if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(E)) { | ||||
13846 | assert(UnOp->getOpcode() == UO_AddrOf &&((UnOp->getOpcode() == UO_AddrOf && "Can only take the address of an overloaded function" ) ? static_cast<void> (0) : __assert_fail ("UnOp->getOpcode() == UO_AddrOf && \"Can only take the address of an overloaded function\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13847, __PRETTY_FUNCTION__)) | ||||
13847 | "Can only take the address of an overloaded function")((UnOp->getOpcode() == UO_AddrOf && "Can only take the address of an overloaded function" ) ? static_cast<void> (0) : __assert_fail ("UnOp->getOpcode() == UO_AddrOf && \"Can only take the address of an overloaded function\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13847, __PRETTY_FUNCTION__)); | ||||
13848 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) { | ||||
13849 | if (Method->isStatic()) { | ||||
13850 | // Do nothing: static member functions aren't any different | ||||
13851 | // from non-member functions. | ||||
13852 | } else { | ||||
13853 | // Fix the subexpression, which really has to be an | ||||
13854 | // UnresolvedLookupExpr holding an overloaded member function | ||||
13855 | // or template. | ||||
13856 | Expr *SubExpr = FixOverloadedFunctionReference(UnOp->getSubExpr(), | ||||
13857 | Found, Fn); | ||||
13858 | if (SubExpr == UnOp->getSubExpr()) | ||||
13859 | return UnOp; | ||||
13860 | |||||
13861 | assert(isa<DeclRefExpr>(SubExpr)((isa<DeclRefExpr>(SubExpr) && "fixed to something other than a decl ref" ) ? static_cast<void> (0) : __assert_fail ("isa<DeclRefExpr>(SubExpr) && \"fixed to something other than a decl ref\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13862, __PRETTY_FUNCTION__)) | ||||
13862 | && "fixed to something other than a decl ref")((isa<DeclRefExpr>(SubExpr) && "fixed to something other than a decl ref" ) ? static_cast<void> (0) : __assert_fail ("isa<DeclRefExpr>(SubExpr) && \"fixed to something other than a decl ref\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13862, __PRETTY_FUNCTION__)); | ||||
13863 | assert(cast<DeclRefExpr>(SubExpr)->getQualifier()((cast<DeclRefExpr>(SubExpr)->getQualifier() && "fixed to a member ref with no nested name qualifier") ? static_cast <void> (0) : __assert_fail ("cast<DeclRefExpr>(SubExpr)->getQualifier() && \"fixed to a member ref with no nested name qualifier\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13864, __PRETTY_FUNCTION__)) | ||||
13864 | && "fixed to a member ref with no nested name qualifier")((cast<DeclRefExpr>(SubExpr)->getQualifier() && "fixed to a member ref with no nested name qualifier") ? static_cast <void> (0) : __assert_fail ("cast<DeclRefExpr>(SubExpr)->getQualifier() && \"fixed to a member ref with no nested name qualifier\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13864, __PRETTY_FUNCTION__)); | ||||
13865 | |||||
13866 | // We have taken the address of a pointer to member | ||||
13867 | // function. Perform the computation here so that we get the | ||||
13868 | // appropriate pointer to member type. | ||||
13869 | QualType ClassType | ||||
13870 | = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); | ||||
13871 | QualType MemPtrType | ||||
13872 | = Context.getMemberPointerType(Fn->getType(), ClassType.getTypePtr()); | ||||
13873 | // Under the MS ABI, lock down the inheritance model now. | ||||
13874 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) | ||||
13875 | (void)isCompleteType(UnOp->getOperatorLoc(), MemPtrType); | ||||
13876 | |||||
13877 | return new (Context) UnaryOperator(SubExpr, UO_AddrOf, MemPtrType, | ||||
13878 | VK_RValue, OK_Ordinary, | ||||
13879 | UnOp->getOperatorLoc(), false); | ||||
13880 | } | ||||
13881 | } | ||||
13882 | Expr *SubExpr = FixOverloadedFunctionReference(UnOp->getSubExpr(), | ||||
13883 | Found, Fn); | ||||
13884 | if (SubExpr == UnOp->getSubExpr()) | ||||
13885 | return UnOp; | ||||
13886 | |||||
13887 | return new (Context) UnaryOperator(SubExpr, UO_AddrOf, | ||||
13888 | Context.getPointerType(SubExpr->getType()), | ||||
13889 | VK_RValue, OK_Ordinary, | ||||
13890 | UnOp->getOperatorLoc(), false); | ||||
13891 | } | ||||
13892 | |||||
13893 | // C++ [except.spec]p17: | ||||
13894 | // An exception-specification is considered to be needed when: | ||||
13895 | // - in an expression the function is the unique lookup result or the | ||||
13896 | // selected member of a set of overloaded functions | ||||
13897 | if (auto *FPT = Fn->getType()->getAs<FunctionProtoType>()) | ||||
13898 | ResolveExceptionSpec(E->getExprLoc(), FPT); | ||||
13899 | |||||
13900 | if (UnresolvedLookupExpr *ULE = dyn_cast<UnresolvedLookupExpr>(E)) { | ||||
13901 | // FIXME: avoid copy. | ||||
13902 | TemplateArgumentListInfo TemplateArgsBuffer, *TemplateArgs = nullptr; | ||||
13903 | if (ULE->hasExplicitTemplateArgs()) { | ||||
13904 | ULE->copyTemplateArgumentsInto(TemplateArgsBuffer); | ||||
13905 | TemplateArgs = &TemplateArgsBuffer; | ||||
13906 | } | ||||
13907 | |||||
13908 | DeclRefExpr *DRE = | ||||
13909 | BuildDeclRefExpr(Fn, Fn->getType(), VK_LValue, ULE->getNameInfo(), | ||||
13910 | ULE->getQualifierLoc(), Found.getDecl(), | ||||
13911 | ULE->getTemplateKeywordLoc(), TemplateArgs); | ||||
13912 | DRE->setHadMultipleCandidates(ULE->getNumDecls() > 1); | ||||
13913 | return DRE; | ||||
13914 | } | ||||
13915 | |||||
13916 | if (UnresolvedMemberExpr *MemExpr = dyn_cast<UnresolvedMemberExpr>(E)) { | ||||
13917 | // FIXME: avoid copy. | ||||
13918 | TemplateArgumentListInfo TemplateArgsBuffer, *TemplateArgs = nullptr; | ||||
13919 | if (MemExpr->hasExplicitTemplateArgs()) { | ||||
13920 | MemExpr->copyTemplateArgumentsInto(TemplateArgsBuffer); | ||||
13921 | TemplateArgs = &TemplateArgsBuffer; | ||||
13922 | } | ||||
13923 | |||||
13924 | Expr *Base; | ||||
13925 | |||||
13926 | // If we're filling in a static method where we used to have an | ||||
13927 | // implicit member access, rewrite to a simple decl ref. | ||||
13928 | if (MemExpr->isImplicitAccess()) { | ||||
13929 | if (cast<CXXMethodDecl>(Fn)->isStatic()) { | ||||
13930 | DeclRefExpr *DRE = BuildDeclRefExpr( | ||||
13931 | Fn, Fn->getType(), VK_LValue, MemExpr->getNameInfo(), | ||||
13932 | MemExpr->getQualifierLoc(), Found.getDecl(), | ||||
13933 | MemExpr->getTemplateKeywordLoc(), TemplateArgs); | ||||
13934 | DRE->setHadMultipleCandidates(MemExpr->getNumDecls() > 1); | ||||
13935 | return DRE; | ||||
13936 | } else { | ||||
13937 | SourceLocation Loc = MemExpr->getMemberLoc(); | ||||
13938 | if (MemExpr->getQualifier()) | ||||
13939 | Loc = MemExpr->getQualifierLoc().getBeginLoc(); | ||||
13940 | Base = | ||||
13941 | BuildCXXThisExpr(Loc, MemExpr->getBaseType(), /*IsImplicit=*/true); | ||||
13942 | } | ||||
13943 | } else | ||||
13944 | Base = MemExpr->getBase(); | ||||
13945 | |||||
13946 | ExprValueKind valueKind; | ||||
13947 | QualType type; | ||||
13948 | if (cast<CXXMethodDecl>(Fn)->isStatic()) { | ||||
13949 | valueKind = VK_LValue; | ||||
13950 | type = Fn->getType(); | ||||
13951 | } else { | ||||
13952 | valueKind = VK_RValue; | ||||
13953 | type = Context.BoundMemberTy; | ||||
13954 | } | ||||
13955 | |||||
13956 | return BuildMemberExpr( | ||||
13957 | Base, MemExpr->isArrow(), MemExpr->getOperatorLoc(), | ||||
13958 | MemExpr->getQualifierLoc(), MemExpr->getTemplateKeywordLoc(), Fn, Found, | ||||
13959 | /*HadMultipleCandidates=*/true, MemExpr->getMemberNameInfo(), | ||||
13960 | type, valueKind, OK_Ordinary, TemplateArgs); | ||||
13961 | } | ||||
13962 | |||||
13963 | llvm_unreachable("Invalid reference to overloaded function")::llvm::llvm_unreachable_internal("Invalid reference to overloaded function" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/lib/Sema/SemaOverload.cpp" , 13963); | ||||
13964 | } | ||||
13965 | |||||
13966 | ExprResult Sema::FixOverloadedFunctionReference(ExprResult E, | ||||
13967 | DeclAccessPair Found, | ||||
13968 | FunctionDecl *Fn) { | ||||
13969 | return FixOverloadedFunctionReference(E.get(), Found, Fn); | ||||
13970 | } |
1 | //===- Overload.h - C++ Overloading -----------------------------*- C++ -*-===// | |||
2 | // | |||
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |||
4 | // See https://llvm.org/LICENSE.txt for license information. | |||
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |||
6 | // | |||
7 | //===----------------------------------------------------------------------===// | |||
8 | // | |||
9 | // This file defines the data structures and types used in C++ | |||
10 | // overload resolution. | |||
11 | // | |||
12 | //===----------------------------------------------------------------------===// | |||
13 | ||||
14 | #ifndef LLVM_CLANG_SEMA_OVERLOAD_H | |||
15 | #define LLVM_CLANG_SEMA_OVERLOAD_H | |||
16 | ||||
17 | #include "clang/AST/Decl.h" | |||
18 | #include "clang/AST/DeclAccessPair.h" | |||
19 | #include "clang/AST/DeclBase.h" | |||
20 | #include "clang/AST/DeclCXX.h" | |||
21 | #include "clang/AST/DeclTemplate.h" | |||
22 | #include "clang/AST/Expr.h" | |||
23 | #include "clang/AST/Type.h" | |||
24 | #include "clang/Basic/LLVM.h" | |||
25 | #include "clang/Basic/SourceLocation.h" | |||
26 | #include "clang/Sema/SemaFixItUtils.h" | |||
27 | #include "clang/Sema/TemplateDeduction.h" | |||
28 | #include "llvm/ADT/ArrayRef.h" | |||
29 | #include "llvm/ADT/None.h" | |||
30 | #include "llvm/ADT/STLExtras.h" | |||
31 | #include "llvm/ADT/SmallPtrSet.h" | |||
32 | #include "llvm/ADT/SmallVector.h" | |||
33 | #include "llvm/ADT/StringRef.h" | |||
34 | #include "llvm/Support/AlignOf.h" | |||
35 | #include "llvm/Support/Allocator.h" | |||
36 | #include "llvm/Support/Casting.h" | |||
37 | #include "llvm/Support/ErrorHandling.h" | |||
38 | #include <cassert> | |||
39 | #include <cstddef> | |||
40 | #include <cstdint> | |||
41 | #include <utility> | |||
42 | ||||
43 | namespace clang { | |||
44 | ||||
45 | class APValue; | |||
46 | class ASTContext; | |||
47 | class Sema; | |||
48 | ||||
49 | /// OverloadingResult - Capture the result of performing overload | |||
50 | /// resolution. | |||
51 | enum OverloadingResult { | |||
52 | /// Overload resolution succeeded. | |||
53 | OR_Success, | |||
54 | ||||
55 | /// No viable function found. | |||
56 | OR_No_Viable_Function, | |||
57 | ||||
58 | /// Ambiguous candidates found. | |||
59 | OR_Ambiguous, | |||
60 | ||||
61 | /// Succeeded, but refers to a deleted function. | |||
62 | OR_Deleted | |||
63 | }; | |||
64 | ||||
65 | enum OverloadCandidateDisplayKind { | |||
66 | /// Requests that all candidates be shown. Viable candidates will | |||
67 | /// be printed first. | |||
68 | OCD_AllCandidates, | |||
69 | ||||
70 | /// Requests that only viable candidates be shown. | |||
71 | OCD_ViableCandidates | |||
72 | }; | |||
73 | ||||
74 | /// ImplicitConversionKind - The kind of implicit conversion used to | |||
75 | /// convert an argument to a parameter's type. The enumerator values | |||
76 | /// match with the table titled 'Conversions' in [over.ics.scs] and are listed | |||
77 | /// such that better conversion kinds have smaller values. | |||
78 | enum ImplicitConversionKind { | |||
79 | /// Identity conversion (no conversion) | |||
80 | ICK_Identity = 0, | |||
81 | ||||
82 | /// Lvalue-to-rvalue conversion (C++ [conv.lval]) | |||
83 | ICK_Lvalue_To_Rvalue, | |||
84 | ||||
85 | /// Array-to-pointer conversion (C++ [conv.array]) | |||
86 | ICK_Array_To_Pointer, | |||
87 | ||||
88 | /// Function-to-pointer (C++ [conv.array]) | |||
89 | ICK_Function_To_Pointer, | |||
90 | ||||
91 | /// Function pointer conversion (C++17 [conv.fctptr]) | |||
92 | ICK_Function_Conversion, | |||
93 | ||||
94 | /// Qualification conversions (C++ [conv.qual]) | |||
95 | ICK_Qualification, | |||
96 | ||||
97 | /// Integral promotions (C++ [conv.prom]) | |||
98 | ICK_Integral_Promotion, | |||
99 | ||||
100 | /// Floating point promotions (C++ [conv.fpprom]) | |||
101 | ICK_Floating_Promotion, | |||
102 | ||||
103 | /// Complex promotions (Clang extension) | |||
104 | ICK_Complex_Promotion, | |||
105 | ||||
106 | /// Integral conversions (C++ [conv.integral]) | |||
107 | ICK_Integral_Conversion, | |||
108 | ||||
109 | /// Floating point conversions (C++ [conv.double] | |||
110 | ICK_Floating_Conversion, | |||
111 | ||||
112 | /// Complex conversions (C99 6.3.1.6) | |||
113 | ICK_Complex_Conversion, | |||
114 | ||||
115 | /// Floating-integral conversions (C++ [conv.fpint]) | |||
116 | ICK_Floating_Integral, | |||
117 | ||||
118 | /// Pointer conversions (C++ [conv.ptr]) | |||
119 | ICK_Pointer_Conversion, | |||
120 | ||||
121 | /// Pointer-to-member conversions (C++ [conv.mem]) | |||
122 | ICK_Pointer_Member, | |||
123 | ||||
124 | /// Boolean conversions (C++ [conv.bool]) | |||
125 | ICK_Boolean_Conversion, | |||
126 | ||||
127 | /// Conversions between compatible types in C99 | |||
128 | ICK_Compatible_Conversion, | |||
129 | ||||
130 | /// Derived-to-base (C++ [over.best.ics]) | |||
131 | ICK_Derived_To_Base, | |||
132 | ||||
133 | /// Vector conversions | |||
134 | ICK_Vector_Conversion, | |||
135 | ||||
136 | /// A vector splat from an arithmetic type | |||
137 | ICK_Vector_Splat, | |||
138 | ||||
139 | /// Complex-real conversions (C99 6.3.1.7) | |||
140 | ICK_Complex_Real, | |||
141 | ||||
142 | /// Block Pointer conversions | |||
143 | ICK_Block_Pointer_Conversion, | |||
144 | ||||
145 | /// Transparent Union Conversions | |||
146 | ICK_TransparentUnionConversion, | |||
147 | ||||
148 | /// Objective-C ARC writeback conversion | |||
149 | ICK_Writeback_Conversion, | |||
150 | ||||
151 | /// Zero constant to event (OpenCL1.2 6.12.10) | |||
152 | ICK_Zero_Event_Conversion, | |||
153 | ||||
154 | /// Zero constant to queue | |||
155 | ICK_Zero_Queue_Conversion, | |||
156 | ||||
157 | /// Conversions allowed in C, but not C++ | |||
158 | ICK_C_Only_Conversion, | |||
159 | ||||
160 | /// C-only conversion between pointers with incompatible types | |||
161 | ICK_Incompatible_Pointer_Conversion, | |||
162 | ||||
163 | /// The number of conversion kinds | |||
164 | ICK_Num_Conversion_Kinds, | |||
165 | }; | |||
166 | ||||
167 | /// ImplicitConversionRank - The rank of an implicit conversion | |||
168 | /// kind. The enumerator values match with Table 9 of (C++ | |||
169 | /// 13.3.3.1.1) and are listed such that better conversion ranks | |||
170 | /// have smaller values. | |||
171 | enum ImplicitConversionRank { | |||
172 | /// Exact Match | |||
173 | ICR_Exact_Match = 0, | |||
174 | ||||
175 | /// Promotion | |||
176 | ICR_Promotion, | |||
177 | ||||
178 | /// Conversion | |||
179 | ICR_Conversion, | |||
180 | ||||
181 | /// OpenCL Scalar Widening | |||
182 | ICR_OCL_Scalar_Widening, | |||
183 | ||||
184 | /// Complex <-> Real conversion | |||
185 | ICR_Complex_Real_Conversion, | |||
186 | ||||
187 | /// ObjC ARC writeback conversion | |||
188 | ICR_Writeback_Conversion, | |||
189 | ||||
190 | /// Conversion only allowed in the C standard (e.g. void* to char*). | |||
191 | ICR_C_Conversion, | |||
192 | ||||
193 | /// Conversion not allowed by the C standard, but that we accept as an | |||
194 | /// extension anyway. | |||
195 | ICR_C_Conversion_Extension | |||
196 | }; | |||
197 | ||||
198 | ImplicitConversionRank GetConversionRank(ImplicitConversionKind Kind); | |||
199 | ||||
200 | /// NarrowingKind - The kind of narrowing conversion being performed by a | |||
201 | /// standard conversion sequence according to C++11 [dcl.init.list]p7. | |||
202 | enum NarrowingKind { | |||
203 | /// Not a narrowing conversion. | |||
204 | NK_Not_Narrowing, | |||
205 | ||||
206 | /// A narrowing conversion by virtue of the source and destination types. | |||
207 | NK_Type_Narrowing, | |||
208 | ||||
209 | /// A narrowing conversion, because a constant expression got narrowed. | |||
210 | NK_Constant_Narrowing, | |||
211 | ||||
212 | /// A narrowing conversion, because a non-constant-expression variable might | |||
213 | /// have got narrowed. | |||
214 | NK_Variable_Narrowing, | |||
215 | ||||
216 | /// Cannot tell whether this is a narrowing conversion because the | |||
217 | /// expression is value-dependent. | |||
218 | NK_Dependent_Narrowing, | |||
219 | }; | |||
220 | ||||
221 | /// StandardConversionSequence - represents a standard conversion | |||
222 | /// sequence (C++ 13.3.3.1.1). A standard conversion sequence | |||
223 | /// contains between zero and three conversions. If a particular | |||
224 | /// conversion is not needed, it will be set to the identity conversion | |||
225 | /// (ICK_Identity). Note that the three conversions are | |||
226 | /// specified as separate members (rather than in an array) so that | |||
227 | /// we can keep the size of a standard conversion sequence to a | |||
228 | /// single word. | |||
229 | class StandardConversionSequence { | |||
230 | public: | |||
231 | /// First -- The first conversion can be an lvalue-to-rvalue | |||
232 | /// conversion, array-to-pointer conversion, or | |||
233 | /// function-to-pointer conversion. | |||
234 | ImplicitConversionKind First : 8; | |||
235 | ||||
236 | /// Second - The second conversion can be an integral promotion, | |||
237 | /// floating point promotion, integral conversion, floating point | |||
238 | /// conversion, floating-integral conversion, pointer conversion, | |||
239 | /// pointer-to-member conversion, or boolean conversion. | |||
240 | ImplicitConversionKind Second : 8; | |||
241 | ||||
242 | /// Third - The third conversion can be a qualification conversion | |||
243 | /// or a function conversion. | |||
244 | ImplicitConversionKind Third : 8; | |||
245 | ||||
246 | /// Whether this is the deprecated conversion of a | |||
247 | /// string literal to a pointer to non-const character data | |||
248 | /// (C++ 4.2p2). | |||
249 | unsigned DeprecatedStringLiteralToCharPtr : 1; | |||
250 | ||||
251 | /// Whether the qualification conversion involves a change in the | |||
252 | /// Objective-C lifetime (for automatic reference counting). | |||
253 | unsigned QualificationIncludesObjCLifetime : 1; | |||
254 | ||||
255 | /// IncompatibleObjC - Whether this is an Objective-C conversion | |||
256 | /// that we should warn about (if we actually use it). | |||
257 | unsigned IncompatibleObjC : 1; | |||
258 | ||||
259 | /// ReferenceBinding - True when this is a reference binding | |||
260 | /// (C++ [over.ics.ref]). | |||
261 | unsigned ReferenceBinding : 1; | |||
262 | ||||
263 | /// DirectBinding - True when this is a reference binding that is a | |||
264 | /// direct binding (C++ [dcl.init.ref]). | |||
265 | unsigned DirectBinding : 1; | |||
266 | ||||
267 | /// Whether this is an lvalue reference binding (otherwise, it's | |||
268 | /// an rvalue reference binding). | |||
269 | unsigned IsLvalueReference : 1; | |||
270 | ||||
271 | /// Whether we're binding to a function lvalue. | |||
272 | unsigned BindsToFunctionLvalue : 1; | |||
273 | ||||
274 | /// Whether we're binding to an rvalue. | |||
275 | unsigned BindsToRvalue : 1; | |||
276 | ||||
277 | /// Whether this binds an implicit object argument to a | |||
278 | /// non-static member function without a ref-qualifier. | |||
279 | unsigned BindsImplicitObjectArgumentWithoutRefQualifier : 1; | |||
280 | ||||
281 | /// Whether this binds a reference to an object with a different | |||
282 | /// Objective-C lifetime qualifier. | |||
283 | unsigned ObjCLifetimeConversionBinding : 1; | |||
284 | ||||
285 | /// FromType - The type that this conversion is converting | |||
286 | /// from. This is an opaque pointer that can be translated into a | |||
287 | /// QualType. | |||
288 | void *FromTypePtr; | |||
289 | ||||
290 | /// ToType - The types that this conversion is converting to in | |||
291 | /// each step. This is an opaque pointer that can be translated | |||
292 | /// into a QualType. | |||
293 | void *ToTypePtrs[3]; | |||
294 | ||||
295 | /// CopyConstructor - The copy constructor that is used to perform | |||
296 | /// this conversion, when the conversion is actually just the | |||
297 | /// initialization of an object via copy constructor. Such | |||
298 | /// conversions are either identity conversions or derived-to-base | |||
299 | /// conversions. | |||
300 | CXXConstructorDecl *CopyConstructor; | |||
301 | DeclAccessPair FoundCopyConstructor; | |||
302 | ||||
303 | void setFromType(QualType T) { FromTypePtr = T.getAsOpaquePtr(); } | |||
304 | ||||
305 | void setToType(unsigned Idx, QualType T) { | |||
306 | assert(Idx < 3 && "To type index is out of range")((Idx < 3 && "To type index is out of range") ? static_cast <void> (0) : __assert_fail ("Idx < 3 && \"To type index is out of range\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 306, __PRETTY_FUNCTION__)); | |||
307 | ToTypePtrs[Idx] = T.getAsOpaquePtr(); | |||
308 | } | |||
309 | ||||
310 | void setAllToTypes(QualType T) { | |||
311 | ToTypePtrs[0] = T.getAsOpaquePtr(); | |||
312 | ToTypePtrs[1] = ToTypePtrs[0]; | |||
313 | ToTypePtrs[2] = ToTypePtrs[0]; | |||
314 | } | |||
315 | ||||
316 | QualType getFromType() const { | |||
317 | return QualType::getFromOpaquePtr(FromTypePtr); | |||
318 | } | |||
319 | ||||
320 | QualType getToType(unsigned Idx) const { | |||
321 | assert(Idx < 3 && "To type index is out of range")((Idx < 3 && "To type index is out of range") ? static_cast <void> (0) : __assert_fail ("Idx < 3 && \"To type index is out of range\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 321, __PRETTY_FUNCTION__)); | |||
322 | return QualType::getFromOpaquePtr(ToTypePtrs[Idx]); | |||
323 | } | |||
324 | ||||
325 | void setAsIdentityConversion(); | |||
326 | ||||
327 | bool isIdentityConversion() const { | |||
328 | return Second == ICK_Identity && Third == ICK_Identity; | |||
329 | } | |||
330 | ||||
331 | ImplicitConversionRank getRank() const; | |||
332 | NarrowingKind | |||
333 | getNarrowingKind(ASTContext &Context, const Expr *Converted, | |||
334 | APValue &ConstantValue, QualType &ConstantType, | |||
335 | bool IgnoreFloatToIntegralConversion = false) const; | |||
336 | bool isPointerConversionToBool() const; | |||
337 | bool isPointerConversionToVoidPointer(ASTContext& Context) const; | |||
338 | void dump() const; | |||
339 | }; | |||
340 | ||||
341 | /// UserDefinedConversionSequence - Represents a user-defined | |||
342 | /// conversion sequence (C++ 13.3.3.1.2). | |||
343 | struct UserDefinedConversionSequence { | |||
344 | /// Represents the standard conversion that occurs before | |||
345 | /// the actual user-defined conversion. | |||
346 | /// | |||
347 | /// C++11 13.3.3.1.2p1: | |||
348 | /// If the user-defined conversion is specified by a constructor | |||
349 | /// (12.3.1), the initial standard conversion sequence converts | |||
350 | /// the source type to the type required by the argument of the | |||
351 | /// constructor. If the user-defined conversion is specified by | |||
352 | /// a conversion function (12.3.2), the initial standard | |||
353 | /// conversion sequence converts the source type to the implicit | |||
354 | /// object parameter of the conversion function. | |||
355 | StandardConversionSequence Before; | |||
356 | ||||
357 | /// EllipsisConversion - When this is true, it means user-defined | |||
358 | /// conversion sequence starts with a ... (ellipsis) conversion, instead of | |||
359 | /// a standard conversion. In this case, 'Before' field must be ignored. | |||
360 | // FIXME. I much rather put this as the first field. But there seems to be | |||
361 | // a gcc code gen. bug which causes a crash in a test. Putting it here seems | |||
362 | // to work around the crash. | |||
363 | bool EllipsisConversion : 1; | |||
364 | ||||
365 | /// HadMultipleCandidates - When this is true, it means that the | |||
366 | /// conversion function was resolved from an overloaded set having | |||
367 | /// size greater than 1. | |||
368 | bool HadMultipleCandidates : 1; | |||
369 | ||||
370 | /// After - Represents the standard conversion that occurs after | |||
371 | /// the actual user-defined conversion. | |||
372 | StandardConversionSequence After; | |||
373 | ||||
374 | /// ConversionFunction - The function that will perform the | |||
375 | /// user-defined conversion. Null if the conversion is an | |||
376 | /// aggregate initialization from an initializer list. | |||
377 | FunctionDecl* ConversionFunction; | |||
378 | ||||
379 | /// The declaration that we found via name lookup, which might be | |||
380 | /// the same as \c ConversionFunction or it might be a using declaration | |||
381 | /// that refers to \c ConversionFunction. | |||
382 | DeclAccessPair FoundConversionFunction; | |||
383 | ||||
384 | void dump() const; | |||
385 | }; | |||
386 | ||||
387 | /// Represents an ambiguous user-defined conversion sequence. | |||
388 | struct AmbiguousConversionSequence { | |||
389 | using ConversionSet = | |||
390 | SmallVector<std::pair<NamedDecl *, FunctionDecl *>, 4>; | |||
391 | ||||
392 | void *FromTypePtr; | |||
393 | void *ToTypePtr; | |||
394 | char Buffer[sizeof(ConversionSet)]; | |||
395 | ||||
396 | QualType getFromType() const { | |||
397 | return QualType::getFromOpaquePtr(FromTypePtr); | |||
398 | } | |||
399 | ||||
400 | QualType getToType() const { | |||
401 | return QualType::getFromOpaquePtr(ToTypePtr); | |||
402 | } | |||
403 | ||||
404 | void setFromType(QualType T) { FromTypePtr = T.getAsOpaquePtr(); } | |||
405 | void setToType(QualType T) { ToTypePtr = T.getAsOpaquePtr(); } | |||
406 | ||||
407 | ConversionSet &conversions() { | |||
408 | return *reinterpret_cast<ConversionSet*>(Buffer); | |||
409 | } | |||
410 | ||||
411 | const ConversionSet &conversions() const { | |||
412 | return *reinterpret_cast<const ConversionSet*>(Buffer); | |||
413 | } | |||
414 | ||||
415 | void addConversion(NamedDecl *Found, FunctionDecl *D) { | |||
416 | conversions().push_back(std::make_pair(Found, D)); | |||
417 | } | |||
418 | ||||
419 | using iterator = ConversionSet::iterator; | |||
420 | ||||
421 | iterator begin() { return conversions().begin(); } | |||
422 | iterator end() { return conversions().end(); } | |||
423 | ||||
424 | using const_iterator = ConversionSet::const_iterator; | |||
425 | ||||
426 | const_iterator begin() const { return conversions().begin(); } | |||
427 | const_iterator end() const { return conversions().end(); } | |||
428 | ||||
429 | void construct(); | |||
430 | void destruct(); | |||
431 | void copyFrom(const AmbiguousConversionSequence &); | |||
432 | }; | |||
433 | ||||
434 | /// BadConversionSequence - Records information about an invalid | |||
435 | /// conversion sequence. | |||
436 | struct BadConversionSequence { | |||
437 | enum FailureKind { | |||
438 | no_conversion, | |||
439 | unrelated_class, | |||
440 | bad_qualifiers, | |||
441 | lvalue_ref_to_rvalue, | |||
442 | rvalue_ref_to_lvalue | |||
443 | }; | |||
444 | ||||
445 | // This can be null, e.g. for implicit object arguments. | |||
446 | Expr *FromExpr; | |||
447 | ||||
448 | FailureKind Kind; | |||
449 | ||||
450 | private: | |||
451 | // The type we're converting from (an opaque QualType). | |||
452 | void *FromTy; | |||
453 | ||||
454 | // The type we're converting to (an opaque QualType). | |||
455 | void *ToTy; | |||
456 | ||||
457 | public: | |||
458 | void init(FailureKind K, Expr *From, QualType To) { | |||
459 | init(K, From->getType(), To); | |||
460 | FromExpr = From; | |||
461 | } | |||
462 | ||||
463 | void init(FailureKind K, QualType From, QualType To) { | |||
464 | Kind = K; | |||
465 | FromExpr = nullptr; | |||
466 | setFromType(From); | |||
467 | setToType(To); | |||
468 | } | |||
469 | ||||
470 | QualType getFromType() const { return QualType::getFromOpaquePtr(FromTy); } | |||
471 | QualType getToType() const { return QualType::getFromOpaquePtr(ToTy); } | |||
472 | ||||
473 | void setFromExpr(Expr *E) { | |||
474 | FromExpr = E; | |||
475 | setFromType(E->getType()); | |||
476 | } | |||
477 | ||||
478 | void setFromType(QualType T) { FromTy = T.getAsOpaquePtr(); } | |||
479 | void setToType(QualType T) { ToTy = T.getAsOpaquePtr(); } | |||
480 | }; | |||
481 | ||||
482 | /// ImplicitConversionSequence - Represents an implicit conversion | |||
483 | /// sequence, which may be a standard conversion sequence | |||
484 | /// (C++ 13.3.3.1.1), user-defined conversion sequence (C++ 13.3.3.1.2), | |||
485 | /// or an ellipsis conversion sequence (C++ 13.3.3.1.3). | |||
486 | class ImplicitConversionSequence { | |||
487 | public: | |||
488 | /// Kind - The kind of implicit conversion sequence. BadConversion | |||
489 | /// specifies that there is no conversion from the source type to | |||
490 | /// the target type. AmbiguousConversion represents the unique | |||
491 | /// ambiguous conversion (C++0x [over.best.ics]p10). | |||
492 | enum Kind { | |||
493 | StandardConversion = 0, | |||
494 | UserDefinedConversion, | |||
495 | AmbiguousConversion, | |||
496 | EllipsisConversion, | |||
497 | BadConversion | |||
498 | }; | |||
499 | ||||
500 | private: | |||
501 | enum { | |||
502 | Uninitialized = BadConversion + 1 | |||
503 | }; | |||
504 | ||||
505 | /// ConversionKind - The kind of implicit conversion sequence. | |||
506 | unsigned ConversionKind : 30; | |||
507 | ||||
508 | /// Whether the target is really a std::initializer_list, and the | |||
509 | /// sequence only represents the worst element conversion. | |||
510 | unsigned StdInitializerListElement : 1; | |||
511 | ||||
512 | void setKind(Kind K) { | |||
513 | destruct(); | |||
514 | ConversionKind = K; | |||
515 | } | |||
516 | ||||
517 | void destruct() { | |||
518 | if (ConversionKind == AmbiguousConversion) Ambiguous.destruct(); | |||
519 | } | |||
520 | ||||
521 | public: | |||
522 | union { | |||
523 | /// When ConversionKind == StandardConversion, provides the | |||
524 | /// details of the standard conversion sequence. | |||
525 | StandardConversionSequence Standard; | |||
526 | ||||
527 | /// When ConversionKind == UserDefinedConversion, provides the | |||
528 | /// details of the user-defined conversion sequence. | |||
529 | UserDefinedConversionSequence UserDefined; | |||
530 | ||||
531 | /// When ConversionKind == AmbiguousConversion, provides the | |||
532 | /// details of the ambiguous conversion. | |||
533 | AmbiguousConversionSequence Ambiguous; | |||
534 | ||||
535 | /// When ConversionKind == BadConversion, provides the details | |||
536 | /// of the bad conversion. | |||
537 | BadConversionSequence Bad; | |||
538 | }; | |||
539 | ||||
540 | ImplicitConversionSequence() | |||
541 | : ConversionKind(Uninitialized), StdInitializerListElement(false) { | |||
542 | Standard.setAsIdentityConversion(); | |||
543 | } | |||
544 | ||||
545 | ImplicitConversionSequence(const ImplicitConversionSequence &Other) | |||
546 | : ConversionKind(Other.ConversionKind), | |||
547 | StdInitializerListElement(Other.StdInitializerListElement) { | |||
548 | switch (ConversionKind) { | |||
549 | case Uninitialized: break; | |||
550 | case StandardConversion: Standard = Other.Standard; break; | |||
551 | case UserDefinedConversion: UserDefined = Other.UserDefined; break; | |||
552 | case AmbiguousConversion: Ambiguous.copyFrom(Other.Ambiguous); break; | |||
553 | case EllipsisConversion: break; | |||
554 | case BadConversion: Bad = Other.Bad; break; | |||
555 | } | |||
556 | } | |||
557 | ||||
558 | ImplicitConversionSequence & | |||
559 | operator=(const ImplicitConversionSequence &Other) { | |||
560 | destruct(); | |||
561 | new (this) ImplicitConversionSequence(Other); | |||
562 | return *this; | |||
563 | } | |||
564 | ||||
565 | ~ImplicitConversionSequence() { | |||
566 | destruct(); | |||
567 | } | |||
568 | ||||
569 | Kind getKind() const { | |||
570 | assert(isInitialized() && "querying uninitialized conversion")((isInitialized() && "querying uninitialized conversion" ) ? static_cast<void> (0) : __assert_fail ("isInitialized() && \"querying uninitialized conversion\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 570, __PRETTY_FUNCTION__)); | |||
571 | return Kind(ConversionKind); | |||
572 | } | |||
573 | ||||
574 | /// Return a ranking of the implicit conversion sequence | |||
575 | /// kind, where smaller ranks represent better conversion | |||
576 | /// sequences. | |||
577 | /// | |||
578 | /// In particular, this routine gives user-defined conversion | |||
579 | /// sequences and ambiguous conversion sequences the same rank, | |||
580 | /// per C++ [over.best.ics]p10. | |||
581 | unsigned getKindRank() const { | |||
582 | switch (getKind()) { | |||
583 | case StandardConversion: | |||
584 | return 0; | |||
585 | ||||
586 | case UserDefinedConversion: | |||
587 | case AmbiguousConversion: | |||
588 | return 1; | |||
589 | ||||
590 | case EllipsisConversion: | |||
591 | return 2; | |||
592 | ||||
593 | case BadConversion: | |||
594 | return 3; | |||
595 | } | |||
596 | ||||
597 | llvm_unreachable("Invalid ImplicitConversionSequence::Kind!")::llvm::llvm_unreachable_internal("Invalid ImplicitConversionSequence::Kind!" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 597); | |||
598 | } | |||
599 | ||||
600 | bool isBad() const { return getKind() == BadConversion; } | |||
601 | bool isStandard() const { return getKind() == StandardConversion; } | |||
602 | bool isEllipsis() const { return getKind() == EllipsisConversion; } | |||
603 | bool isAmbiguous() const { return getKind() == AmbiguousConversion; } | |||
604 | bool isUserDefined() const { return getKind() == UserDefinedConversion; } | |||
605 | bool isFailure() const { return isBad() || isAmbiguous(); } | |||
606 | ||||
607 | /// Determines whether this conversion sequence has been | |||
608 | /// initialized. Most operations should never need to query | |||
609 | /// uninitialized conversions and should assert as above. | |||
610 | bool isInitialized() const { return ConversionKind != Uninitialized; } | |||
611 | ||||
612 | /// Sets this sequence as a bad conversion for an explicit argument. | |||
613 | void setBad(BadConversionSequence::FailureKind Failure, | |||
614 | Expr *FromExpr, QualType ToType) { | |||
615 | setKind(BadConversion); | |||
616 | Bad.init(Failure, FromExpr, ToType); | |||
617 | } | |||
618 | ||||
619 | /// Sets this sequence as a bad conversion for an implicit argument. | |||
620 | void setBad(BadConversionSequence::FailureKind Failure, | |||
621 | QualType FromType, QualType ToType) { | |||
622 | setKind(BadConversion); | |||
623 | Bad.init(Failure, FromType, ToType); | |||
624 | } | |||
625 | ||||
626 | void setStandard() { setKind(StandardConversion); } | |||
627 | void setEllipsis() { setKind(EllipsisConversion); } | |||
628 | void setUserDefined() { setKind(UserDefinedConversion); } | |||
629 | ||||
630 | void setAmbiguous() { | |||
631 | if (ConversionKind == AmbiguousConversion) return; | |||
632 | ConversionKind = AmbiguousConversion; | |||
633 | Ambiguous.construct(); | |||
634 | } | |||
635 | ||||
636 | void setAsIdentityConversion(QualType T) { | |||
637 | setStandard(); | |||
638 | Standard.setAsIdentityConversion(); | |||
639 | Standard.setFromType(T); | |||
640 | Standard.setAllToTypes(T); | |||
641 | } | |||
642 | ||||
643 | /// Whether the target is really a std::initializer_list, and the | |||
644 | /// sequence only represents the worst element conversion. | |||
645 | bool isStdInitializerListElement() const { | |||
646 | return StdInitializerListElement; | |||
647 | } | |||
648 | ||||
649 | void setStdInitializerListElement(bool V = true) { | |||
650 | StdInitializerListElement = V; | |||
651 | } | |||
652 | ||||
653 | // The result of a comparison between implicit conversion | |||
654 | // sequences. Use Sema::CompareImplicitConversionSequences to | |||
655 | // actually perform the comparison. | |||
656 | enum CompareKind { | |||
657 | Better = -1, | |||
658 | Indistinguishable = 0, | |||
659 | Worse = 1 | |||
660 | }; | |||
661 | ||||
662 | void DiagnoseAmbiguousConversion(Sema &S, | |||
663 | SourceLocation CaretLoc, | |||
664 | const PartialDiagnostic &PDiag) const; | |||
665 | ||||
666 | void dump() const; | |||
667 | }; | |||
668 | ||||
669 | enum OverloadFailureKind { | |||
670 | ovl_fail_too_many_arguments, | |||
671 | ovl_fail_too_few_arguments, | |||
672 | ovl_fail_bad_conversion, | |||
673 | ovl_fail_bad_deduction, | |||
674 | ||||
675 | /// This conversion candidate was not considered because it | |||
676 | /// duplicates the work of a trivial or derived-to-base | |||
677 | /// conversion. | |||
678 | ovl_fail_trivial_conversion, | |||
679 | ||||
680 | /// This conversion candidate was not considered because it is | |||
681 | /// an illegal instantiation of a constructor temploid: it is | |||
682 | /// callable with one argument, we only have one argument, and | |||
683 | /// its first parameter type is exactly the type of the class. | |||
684 | /// | |||
685 | /// Defining such a constructor directly is illegal, and | |||
686 | /// template-argument deduction is supposed to ignore such | |||
687 | /// instantiations, but we can still get one with the right | |||
688 | /// kind of implicit instantiation. | |||
689 | ovl_fail_illegal_constructor, | |||
690 | ||||
691 | /// This conversion candidate is not viable because its result | |||
692 | /// type is not implicitly convertible to the desired type. | |||
693 | ovl_fail_bad_final_conversion, | |||
694 | ||||
695 | /// This conversion function template specialization candidate is not | |||
696 | /// viable because the final conversion was not an exact match. | |||
697 | ovl_fail_final_conversion_not_exact, | |||
698 | ||||
699 | /// (CUDA) This candidate was not viable because the callee | |||
700 | /// was not accessible from the caller's target (i.e. host->device, | |||
701 | /// global->host, device->host). | |||
702 | ovl_fail_bad_target, | |||
703 | ||||
704 | /// This candidate function was not viable because an enable_if | |||
705 | /// attribute disabled it. | |||
706 | ovl_fail_enable_if, | |||
707 | ||||
708 | /// This candidate constructor or conversion fonction | |||
709 | /// is used implicitly but the explicit(bool) specifier | |||
710 | /// was resolved to true | |||
711 | ovl_fail_explicit_resolved, | |||
712 | ||||
713 | /// This candidate was not viable because its address could not be taken. | |||
714 | ovl_fail_addr_not_available, | |||
715 | ||||
716 | /// This candidate was not viable because its OpenCL extension is disabled. | |||
717 | ovl_fail_ext_disabled, | |||
718 | ||||
719 | /// This inherited constructor is not viable because it would slice the | |||
720 | /// argument. | |||
721 | ovl_fail_inhctor_slice, | |||
722 | ||||
723 | /// This candidate was not viable because it is a non-default multiversioned | |||
724 | /// function. | |||
725 | ovl_non_default_multiversion_function, | |||
726 | ||||
727 | /// This constructor/conversion candidate fail due to an address space | |||
728 | /// mismatch between the object being constructed and the overload | |||
729 | /// candidate. | |||
730 | ovl_fail_object_addrspace_mismatch | |||
731 | }; | |||
732 | ||||
733 | /// A list of implicit conversion sequences for the arguments of an | |||
734 | /// OverloadCandidate. | |||
735 | using ConversionSequenceList = | |||
736 | llvm::MutableArrayRef<ImplicitConversionSequence>; | |||
737 | ||||
738 | /// OverloadCandidate - A single candidate in an overload set (C++ 13.3). | |||
739 | struct OverloadCandidate { | |||
740 | /// Function - The actual function that this candidate | |||
741 | /// represents. When NULL, this is a built-in candidate | |||
742 | /// (C++ [over.oper]) or a surrogate for a conversion to a | |||
743 | /// function pointer or reference (C++ [over.call.object]). | |||
744 | FunctionDecl *Function; | |||
745 | ||||
746 | /// FoundDecl - The original declaration that was looked up / | |||
747 | /// invented / otherwise found, together with its access. | |||
748 | /// Might be a UsingShadowDecl or a FunctionTemplateDecl. | |||
749 | DeclAccessPair FoundDecl; | |||
750 | ||||
751 | /// BuiltinParamTypes - Provides the parameter types of a built-in overload | |||
752 | /// candidate. Only valid when Function is NULL. | |||
753 | QualType BuiltinParamTypes[3]; | |||
754 | ||||
755 | /// Surrogate - The conversion function for which this candidate | |||
756 | /// is a surrogate, but only if IsSurrogate is true. | |||
757 | CXXConversionDecl *Surrogate; | |||
758 | ||||
759 | /// The conversion sequences used to convert the function arguments | |||
760 | /// to the function parameters. | |||
761 | ConversionSequenceList Conversions; | |||
762 | ||||
763 | /// The FixIt hints which can be used to fix the Bad candidate. | |||
764 | ConversionFixItGenerator Fix; | |||
765 | ||||
766 | /// Viable - True to indicate that this overload candidate is viable. | |||
767 | bool Viable : 1; | |||
768 | ||||
769 | /// IsSurrogate - True to indicate that this candidate is a | |||
770 | /// surrogate for a conversion to a function pointer or reference | |||
771 | /// (C++ [over.call.object]). | |||
772 | bool IsSurrogate : 1; | |||
773 | ||||
774 | /// IgnoreObjectArgument - True to indicate that the first | |||
775 | /// argument's conversion, which for this function represents the | |||
776 | /// implicit object argument, should be ignored. This will be true | |||
777 | /// when the candidate is a static member function (where the | |||
778 | /// implicit object argument is just a placeholder) or a | |||
779 | /// non-static member function when the call doesn't have an | |||
780 | /// object argument. | |||
781 | bool IgnoreObjectArgument : 1; | |||
782 | ||||
783 | /// True if the candidate was found using ADL. | |||
784 | CallExpr::ADLCallKind IsADLCandidate : 1; | |||
785 | ||||
786 | /// FailureKind - The reason why this candidate is not viable. | |||
787 | /// Actually an OverloadFailureKind. | |||
788 | unsigned char FailureKind; | |||
789 | ||||
790 | /// The number of call arguments that were explicitly provided, | |||
791 | /// to be used while performing partial ordering of function templates. | |||
792 | unsigned ExplicitCallArguments; | |||
793 | ||||
794 | union { | |||
795 | DeductionFailureInfo DeductionFailure; | |||
796 | ||||
797 | /// FinalConversion - For a conversion function (where Function is | |||
798 | /// a CXXConversionDecl), the standard conversion that occurs | |||
799 | /// after the call to the overload candidate to convert the result | |||
800 | /// of calling the conversion function to the required type. | |||
801 | StandardConversionSequence FinalConversion; | |||
802 | }; | |||
803 | ||||
804 | /// hasAmbiguousConversion - Returns whether this overload | |||
805 | /// candidate requires an ambiguous conversion or not. | |||
806 | bool hasAmbiguousConversion() const { | |||
807 | for (auto &C : Conversions) { | |||
808 | if (!C.isInitialized()) return false; | |||
809 | if (C.isAmbiguous()) return true; | |||
810 | } | |||
811 | return false; | |||
812 | } | |||
813 | ||||
814 | bool TryToFixBadConversion(unsigned Idx, Sema &S) { | |||
815 | bool CanFix = Fix.tryToFixConversion( | |||
816 | Conversions[Idx].Bad.FromExpr, | |||
817 | Conversions[Idx].Bad.getFromType(), | |||
818 | Conversions[Idx].Bad.getToType(), S); | |||
819 | ||||
820 | // If at least one conversion fails, the candidate cannot be fixed. | |||
821 | if (!CanFix) | |||
822 | Fix.clear(); | |||
823 | ||||
824 | return CanFix; | |||
825 | } | |||
826 | ||||
827 | unsigned getNumParams() const { | |||
828 | if (IsSurrogate) { | |||
829 | auto STy = Surrogate->getConversionType(); | |||
830 | while (STy->isPointerType() || STy->isReferenceType()) | |||
831 | STy = STy->getPointeeType(); | |||
832 | return STy->getAs<FunctionProtoType>()->getNumParams(); | |||
| ||||
833 | } | |||
834 | if (Function) | |||
835 | return Function->getNumParams(); | |||
836 | return ExplicitCallArguments; | |||
837 | } | |||
838 | ||||
839 | private: | |||
840 | friend class OverloadCandidateSet; | |||
841 | OverloadCandidate() : IsADLCandidate(CallExpr::NotADL) {} | |||
842 | }; | |||
843 | ||||
844 | /// OverloadCandidateSet - A set of overload candidates, used in C++ | |||
845 | /// overload resolution (C++ 13.3). | |||
846 | class OverloadCandidateSet { | |||
847 | public: | |||
848 | enum CandidateSetKind { | |||
849 | /// Normal lookup. | |||
850 | CSK_Normal, | |||
851 | ||||
852 | /// C++ [over.match.oper]: | |||
853 | /// Lookup of operator function candidates in a call using operator | |||
854 | /// syntax. Candidates that have no parameters of class type will be | |||
855 | /// skipped unless there is a parameter of (reference to) enum type and | |||
856 | /// the corresponding argument is of the same enum type. | |||
857 | CSK_Operator, | |||
858 | ||||
859 | /// C++ [over.match.copy]: | |||
860 | /// Copy-initialization of an object of class type by user-defined | |||
861 | /// conversion. | |||
862 | CSK_InitByUserDefinedConversion, | |||
863 | ||||
864 | /// C++ [over.match.ctor], [over.match.list] | |||
865 | /// Initialization of an object of class type by constructor, | |||
866 | /// using either a parenthesized or braced list of arguments. | |||
867 | CSK_InitByConstructor, | |||
868 | }; | |||
869 | ||||
870 | private: | |||
871 | SmallVector<OverloadCandidate, 16> Candidates; | |||
872 | llvm::SmallPtrSet<Decl *, 16> Functions; | |||
873 | ||||
874 | // Allocator for ConversionSequenceLists. We store the first few of these | |||
875 | // inline to avoid allocation for small sets. | |||
876 | llvm::BumpPtrAllocator SlabAllocator; | |||
877 | ||||
878 | SourceLocation Loc; | |||
879 | CandidateSetKind Kind; | |||
880 | ||||
881 | constexpr static unsigned NumInlineBytes = | |||
882 | 24 * sizeof(ImplicitConversionSequence); | |||
883 | unsigned NumInlineBytesUsed = 0; | |||
884 | alignas(void *) char InlineSpace[NumInlineBytes]; | |||
885 | ||||
886 | // Address space of the object being constructed. | |||
887 | LangAS DestAS = LangAS::Default; | |||
888 | ||||
889 | /// If we have space, allocates from inline storage. Otherwise, allocates | |||
890 | /// from the slab allocator. | |||
891 | /// FIXME: It would probably be nice to have a SmallBumpPtrAllocator | |||
892 | /// instead. | |||
893 | /// FIXME: Now that this only allocates ImplicitConversionSequences, do we | |||
894 | /// want to un-generalize this? | |||
895 | template <typename T> | |||
896 | T *slabAllocate(unsigned N) { | |||
897 | // It's simpler if this doesn't need to consider alignment. | |||
898 | static_assert(alignof(T) == alignof(void *), | |||
899 | "Only works for pointer-aligned types."); | |||
900 | static_assert(std::is_trivial<T>::value || | |||
901 | std::is_same<ImplicitConversionSequence, T>::value, | |||
902 | "Add destruction logic to OverloadCandidateSet::clear()."); | |||
903 | ||||
904 | unsigned NBytes = sizeof(T) * N; | |||
905 | if (NBytes > NumInlineBytes - NumInlineBytesUsed) | |||
906 | return SlabAllocator.Allocate<T>(N); | |||
907 | char *FreeSpaceStart = InlineSpace + NumInlineBytesUsed; | |||
908 | assert(uintptr_t(FreeSpaceStart) % alignof(void *) == 0 &&((uintptr_t(FreeSpaceStart) % alignof(void *) == 0 && "Misaligned storage!") ? static_cast<void> (0) : __assert_fail ("uintptr_t(FreeSpaceStart) % alignof(void *) == 0 && \"Misaligned storage!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 909, __PRETTY_FUNCTION__)) | |||
909 | "Misaligned storage!")((uintptr_t(FreeSpaceStart) % alignof(void *) == 0 && "Misaligned storage!") ? static_cast<void> (0) : __assert_fail ("uintptr_t(FreeSpaceStart) % alignof(void *) == 0 && \"Misaligned storage!\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 909, __PRETTY_FUNCTION__)); | |||
910 | ||||
911 | NumInlineBytesUsed += NBytes; | |||
912 | return reinterpret_cast<T *>(FreeSpaceStart); | |||
913 | } | |||
914 | ||||
915 | void destroyCandidates(); | |||
916 | ||||
917 | public: | |||
918 | OverloadCandidateSet(SourceLocation Loc, CandidateSetKind CSK) | |||
919 | : Loc(Loc), Kind(CSK) {} | |||
920 | OverloadCandidateSet(const OverloadCandidateSet &) = delete; | |||
921 | OverloadCandidateSet &operator=(const OverloadCandidateSet &) = delete; | |||
922 | ~OverloadCandidateSet() { destroyCandidates(); } | |||
923 | ||||
924 | SourceLocation getLocation() const { return Loc; } | |||
925 | CandidateSetKind getKind() const { return Kind; } | |||
926 | ||||
927 | /// Determine when this overload candidate will be new to the | |||
928 | /// overload set. | |||
929 | bool isNewCandidate(Decl *F) { | |||
930 | return Functions.insert(F->getCanonicalDecl()).second; | |||
931 | } | |||
932 | ||||
933 | /// Clear out all of the candidates. | |||
934 | void clear(CandidateSetKind CSK); | |||
935 | ||||
936 | using iterator = SmallVectorImpl<OverloadCandidate>::iterator; | |||
937 | ||||
938 | iterator begin() { return Candidates.begin(); } | |||
939 | iterator end() { return Candidates.end(); } | |||
940 | ||||
941 | size_t size() const { return Candidates.size(); } | |||
942 | bool empty() const { return Candidates.empty(); } | |||
943 | ||||
944 | /// Allocate storage for conversion sequences for NumConversions | |||
945 | /// conversions. | |||
946 | ConversionSequenceList | |||
947 | allocateConversionSequences(unsigned NumConversions) { | |||
948 | ImplicitConversionSequence *Conversions = | |||
949 | slabAllocate<ImplicitConversionSequence>(NumConversions); | |||
950 | ||||
951 | // Construct the new objects. | |||
952 | for (unsigned I = 0; I != NumConversions; ++I) | |||
953 | new (&Conversions[I]) ImplicitConversionSequence(); | |||
954 | ||||
955 | return ConversionSequenceList(Conversions, NumConversions); | |||
956 | } | |||
957 | ||||
958 | /// Add a new candidate with NumConversions conversion sequence slots | |||
959 | /// to the overload set. | |||
960 | OverloadCandidate &addCandidate(unsigned NumConversions = 0, | |||
961 | ConversionSequenceList Conversions = None) { | |||
962 | assert((Conversions.empty() || Conversions.size() == NumConversions) &&(((Conversions.empty() || Conversions.size() == NumConversions ) && "preallocated conversion sequence has wrong length" ) ? static_cast<void> (0) : __assert_fail ("(Conversions.empty() || Conversions.size() == NumConversions) && \"preallocated conversion sequence has wrong length\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 963, __PRETTY_FUNCTION__)) | |||
963 | "preallocated conversion sequence has wrong length")(((Conversions.empty() || Conversions.size() == NumConversions ) && "preallocated conversion sequence has wrong length" ) ? static_cast<void> (0) : __assert_fail ("(Conversions.empty() || Conversions.size() == NumConversions) && \"preallocated conversion sequence has wrong length\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 963, __PRETTY_FUNCTION__)); | |||
964 | ||||
965 | Candidates.push_back(OverloadCandidate()); | |||
966 | OverloadCandidate &C = Candidates.back(); | |||
967 | C.Conversions = Conversions.empty() | |||
968 | ? allocateConversionSequences(NumConversions) | |||
969 | : Conversions; | |||
970 | return C; | |||
971 | } | |||
972 | ||||
973 | /// Find the best viable function on this overload set, if it exists. | |||
974 | OverloadingResult BestViableFunction(Sema &S, SourceLocation Loc, | |||
975 | OverloadCandidateSet::iterator& Best); | |||
976 | ||||
977 | SmallVector<OverloadCandidate *, 32> CompleteCandidates( | |||
978 | Sema &S, OverloadCandidateDisplayKind OCD, ArrayRef<Expr *> Args, | |||
979 | SourceLocation OpLoc = SourceLocation(), | |||
980 | llvm::function_ref<bool(OverloadCandidate &)> Filter = | |||
981 | [](OverloadCandidate &) { return true; }); | |||
982 | ||||
983 | void NoteCandidates( | |||
984 | PartialDiagnosticAt PA, Sema &S, OverloadCandidateDisplayKind OCD, | |||
985 | ArrayRef<Expr *> Args, StringRef Opc = "", | |||
986 | SourceLocation Loc = SourceLocation(), | |||
987 | llvm::function_ref<bool(OverloadCandidate &)> Filter = | |||
988 | [](OverloadCandidate &) { return true; }); | |||
989 | ||||
990 | void NoteCandidates(Sema &S, ArrayRef<Expr *> Args, | |||
991 | ArrayRef<OverloadCandidate *> Cands, | |||
992 | StringRef Opc = "", | |||
993 | SourceLocation OpLoc = SourceLocation()); | |||
994 | ||||
995 | LangAS getDestAS() { return DestAS; } | |||
996 | ||||
997 | void setDestAS(LangAS AS) { | |||
998 | assert((Kind == CSK_InitByConstructor ||(((Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion ) && "can't set the destination address space when not constructing an " "object") ? static_cast<void> (0) : __assert_fail ("(Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion) && \"can't set the destination address space when not constructing an \" \"object\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 1001, __PRETTY_FUNCTION__)) | |||
999 | Kind == CSK_InitByUserDefinedConversion) &&(((Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion ) && "can't set the destination address space when not constructing an " "object") ? static_cast<void> (0) : __assert_fail ("(Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion) && \"can't set the destination address space when not constructing an \" \"object\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 1001, __PRETTY_FUNCTION__)) | |||
1000 | "can't set the destination address space when not constructing an "(((Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion ) && "can't set the destination address space when not constructing an " "object") ? static_cast<void> (0) : __assert_fail ("(Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion) && \"can't set the destination address space when not constructing an \" \"object\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 1001, __PRETTY_FUNCTION__)) | |||
1001 | "object")(((Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion ) && "can't set the destination address space when not constructing an " "object") ? static_cast<void> (0) : __assert_fail ("(Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion) && \"can't set the destination address space when not constructing an \" \"object\"" , "/build/llvm-toolchain-snapshot-10~svn373517/tools/clang/include/clang/Sema/Overload.h" , 1001, __PRETTY_FUNCTION__)); | |||
1002 | DestAS = AS; | |||
1003 | } | |||
1004 | ||||
1005 | }; | |||
1006 | ||||
1007 | bool isBetterOverloadCandidate(Sema &S, | |||
1008 | const OverloadCandidate &Cand1, | |||
1009 | const OverloadCandidate &Cand2, | |||
1010 | SourceLocation Loc, | |||
1011 | OverloadCandidateSet::CandidateSetKind Kind); | |||
1012 | ||||
1013 | struct ConstructorInfo { | |||
1014 | DeclAccessPair FoundDecl; | |||
1015 | CXXConstructorDecl *Constructor; | |||
1016 | FunctionTemplateDecl *ConstructorTmpl; | |||
1017 | ||||
1018 | explicit operator bool() const { return Constructor; } | |||
1019 | }; | |||
1020 | ||||
1021 | // FIXME: Add an AddOverloadCandidate / AddTemplateOverloadCandidate overload | |||
1022 | // that takes one of these. | |||
1023 | inline ConstructorInfo getConstructorInfo(NamedDecl *ND) { | |||
1024 | if (isa<UsingDecl>(ND)) | |||
1025 | return ConstructorInfo{}; | |||
1026 | ||||
1027 | // For constructors, the access check is performed against the underlying | |||
1028 | // declaration, not the found declaration. | |||
1029 | auto *D = ND->getUnderlyingDecl(); | |||
1030 | ConstructorInfo Info = {DeclAccessPair::make(ND, D->getAccess()), nullptr, | |||
1031 | nullptr}; | |||
1032 | Info.ConstructorTmpl = dyn_cast<FunctionTemplateDecl>(D); | |||
1033 | if (Info.ConstructorTmpl) | |||
1034 | D = Info.ConstructorTmpl->getTemplatedDecl(); | |||
1035 | Info.Constructor = dyn_cast<CXXConstructorDecl>(D); | |||
1036 | return Info; | |||
1037 | } | |||
1038 | ||||
1039 | } // namespace clang | |||
1040 | ||||
1041 | #endif // LLVM_CLANG_SEMA_OVERLOAD_H |