SemaOverload.cpp revision 199482
189857Sobrien//===--- SemaOverload.cpp - C++ Overloading ---------------------*- C++ -*-===// 2218822Sdim// 3130561Sobrien// The LLVM Compiler Infrastructure 489857Sobrien// 589857Sobrien// This file is distributed under the University of Illinois Open Source 6130561Sobrien// License. See LICENSE.TXT for details. 789857Sobrien// 8130561Sobrien//===----------------------------------------------------------------------===// 989857Sobrien// 10130561Sobrien// This file provides Sema routines for C++ overloading. 11130561Sobrien// 12130561Sobrien//===----------------------------------------------------------------------===// 13130561Sobrien 1489857Sobrien#include "Sema.h" 15130561Sobrien#include "Lookup.h" 16130561Sobrien#include "clang/Basic/Diagnostic.h" 17130561Sobrien#include "clang/Lex/Preprocessor.h" 18130561Sobrien#include "clang/AST/ASTContext.h" 1989857Sobrien#include "clang/AST/CXXInheritance.h" 20130561Sobrien#include "clang/AST/Expr.h" 21130561Sobrien#include "clang/AST/ExprCXX.h" 22218822Sdim#include "clang/AST/TypeOrdering.h" 2389857Sobrien#include "clang/Basic/PartialDiagnostic.h" 24130561Sobrien#include "llvm/ADT/SmallPtrSet.h" 25130561Sobrien#include "llvm/ADT/STLExtras.h" 26130561Sobrien#include "llvm/Support/Compiler.h" 2789857Sobrien#include <algorithm> 28218822Sdim#include <cstdio> 29218822Sdim 3089857Sobriennamespace clang { 3189857Sobrien 3289857Sobrien/// GetConversionCategory - Retrieve the implicit conversion 3389857Sobrien/// category corresponding to the given implicit conversion kind. 34130561SobrienImplicitConversionCategory 3589857SobrienGetConversionCategory(ImplicitConversionKind Kind) { 3689857Sobrien static const ImplicitConversionCategory 3799461Sobrien Category[(int)ICK_Num_Conversion_Kinds] = { 38130561Sobrien ICC_Identity, 39218822Sdim ICC_Lvalue_Transformation, 40218822Sdim ICC_Lvalue_Transformation, 4199461Sobrien ICC_Lvalue_Transformation, 42130561Sobrien ICC_Qualification_Adjustment, 4399461Sobrien ICC_Promotion, 44130561Sobrien ICC_Promotion, 4599461Sobrien ICC_Promotion, 46130561Sobrien ICC_Conversion, 4799461Sobrien ICC_Conversion, 48130561Sobrien ICC_Conversion, 4999461Sobrien ICC_Conversion, 50130561Sobrien ICC_Conversion, 5199461Sobrien ICC_Conversion, 52130561Sobrien ICC_Conversion, 5399461Sobrien ICC_Conversion, 54130561Sobrien ICC_Conversion, 55218822Sdim ICC_Conversion 56218822Sdim }; 5789857Sobrien return Category[(int)Kind]; 58130561Sobrien} 59130561Sobrien 60130561Sobrien/// GetConversionRank - Retrieve the implicit conversion rank 61130561Sobrien/// corresponding to the given implicit conversion kind. 62130561SobrienImplicitConversionRank GetConversionRank(ImplicitConversionKind Kind) { 63130561Sobrien static const ImplicitConversionRank 64130561Sobrien Rank[(int)ICK_Num_Conversion_Kinds] = { 65218822Sdim ICR_Exact_Match, 66130561Sobrien ICR_Exact_Match, 67130561Sobrien ICR_Exact_Match, 68130561Sobrien ICR_Exact_Match, 69130561Sobrien ICR_Exact_Match, 70130561Sobrien ICR_Promotion, 71130561Sobrien ICR_Promotion, 72130561Sobrien ICR_Promotion, 73130561Sobrien ICR_Conversion, 74130561Sobrien ICR_Conversion, 75130561Sobrien ICR_Conversion, 76218822Sdim ICR_Conversion, 77130561Sobrien ICR_Conversion, 78130561Sobrien ICR_Conversion, 79130561Sobrien ICR_Conversion, 80218822Sdim ICR_Conversion, 81130561Sobrien ICR_Conversion, 82130561Sobrien ICR_Conversion 83130561Sobrien }; 84130561Sobrien return Rank[(int)Kind]; 85218822Sdim} 86130561Sobrien 87130561Sobrien/// GetImplicitConversionName - Return the name of this kind of 88130561Sobrien/// implicit conversion. 89130561Sobrienconst char* GetImplicitConversionName(ImplicitConversionKind Kind) { 90218822Sdim static const char* Name[(int)ICK_Num_Conversion_Kinds] = { 91130561Sobrien "No conversion", 92130561Sobrien "Lvalue-to-rvalue", 93130561Sobrien "Array-to-pointer", 94218822Sdim "Function-to-pointer", 95218822Sdim "Qualification", 96218822Sdim "Integral promotion", 97130561Sobrien "Floating point promotion", 98218822Sdim "Complex promotion", 99130561Sobrien "Integral conversion", 100130561Sobrien "Floating conversion", 101130561Sobrien "Complex conversion", 102130561Sobrien "Floating-integral conversion", 103130561Sobrien "Complex-real conversion", 104130561Sobrien "Pointer conversion", 105218822Sdim "Pointer-to-member conversion", 106218822Sdim "Boolean conversion", 107130561Sobrien "Compatible-types conversion", 108130561Sobrien "Derived-to-base conversion" 109130561Sobrien }; 110130561Sobrien return Name[Kind]; 111130561Sobrien} 112130561Sobrien 113130561Sobrien/// StandardConversionSequence - Set the standard conversion 11489857Sobrien/// sequence to the identity conversion. 11589857Sobrienvoid StandardConversionSequence::setAsIdentityConversion() { 11689857Sobrien First = ICK_Identity; 11789857Sobrien Second = ICK_Identity; 11889857Sobrien Third = ICK_Identity; 11989857Sobrien Deprecated = false; 12089857Sobrien ReferenceBinding = false; 12189857Sobrien DirectBinding = false; 12289857Sobrien RRefBinding = false; 12389857Sobrien CopyConstructor = 0; 12489857Sobrien} 125130561Sobrien 12689857Sobrien/// getRank - Retrieve the rank of this standard conversion sequence 127130561Sobrien/// (C++ 13.3.3.1.1p3). The rank is the largest rank of each of the 128130561Sobrien/// implicit conversions. 129130561SobrienImplicitConversionRank StandardConversionSequence::getRank() const { 130130561Sobrien ImplicitConversionRank Rank = ICR_Exact_Match; 131130561Sobrien if (GetConversionRank(First) > Rank) 132130561Sobrien Rank = GetConversionRank(First); 133130561Sobrien if (GetConversionRank(Second) > Rank) 134130561Sobrien Rank = GetConversionRank(Second); 13589857Sobrien if (GetConversionRank(Third) > Rank) 13689857Sobrien Rank = GetConversionRank(Third); 13789857Sobrien return Rank; 13889857Sobrien} 13989857Sobrien 14089857Sobrien/// isPointerConversionToBool - Determines whether this conversion is 14189857Sobrien/// a conversion of a pointer or pointer-to-member to bool. This is 14289857Sobrien/// used as part of the ranking of standard conversion sequences 14389857Sobrien/// (C++ 13.3.3.2p4). 144218822Sdimbool StandardConversionSequence::isPointerConversionToBool() const { 145130561Sobrien QualType FromType = QualType::getFromOpaquePtr(FromTypePtr); 146130561Sobrien QualType ToType = QualType::getFromOpaquePtr(ToTypePtr); 14789857Sobrien 148130561Sobrien // Note that FromType has not necessarily been transformed by the 14989857Sobrien // array-to-pointer or function-to-pointer implicit conversions, so 150218822Sdim // check for their presence as well as checking whether FromType is 151130561Sobrien // a pointer. 152218822Sdim if (ToType->isBooleanType() && 153218822Sdim (FromType->isPointerType() || FromType->isBlockPointerType() || 154218822Sdim First == ICK_Array_To_Pointer || First == ICK_Function_To_Pointer)) 155218822Sdim return true; 156218822Sdim 157218822Sdim return false; 158218822Sdim} 159218822Sdim 160218822Sdim/// isPointerConversionToVoidPointer - Determines whether this 161218822Sdim/// conversion is a conversion of a pointer to a void pointer. This is 162218822Sdim/// used as part of the ranking of standard conversion sequences (C++ 163218822Sdim/// 13.3.3.2p4). 164218822Sdimbool 165218822SdimStandardConversionSequence:: 166218822SdimisPointerConversionToVoidPointer(ASTContext& Context) const { 16789857Sobrien QualType FromType = QualType::getFromOpaquePtr(FromTypePtr); 16889857Sobrien QualType ToType = QualType::getFromOpaquePtr(ToTypePtr); 16989857Sobrien 17089857Sobrien // Note that FromType has not necessarily been transformed by the 17199461Sobrien // array-to-pointer implicit conversion, so check for its presence 17299461Sobrien // and redo the conversion to get a pointer. 17399461Sobrien if (First == ICK_Array_To_Pointer) 17499461Sobrien FromType = Context.getArrayDecayedType(FromType); 175104834Sobrien 17689857Sobrien if (Second == ICK_Pointer_Conversion) 17789857Sobrien if (const PointerType* ToPtrType = ToType->getAs<PointerType>()) 17889857Sobrien return ToPtrType->getPointeeType()->isVoidType(); 17989857Sobrien 18089857Sobrien return false; 18189857Sobrien} 18289857Sobrien 18389857Sobrien/// DebugPrint - Print this standard conversion sequence to standard 184218822Sdim/// error. Useful for debugging overloading issues. 185218822Sdimvoid StandardConversionSequence::DebugPrint() const { 186218822Sdim bool PrintedSomething = false; 187218822Sdim if (First != ICK_Identity) { 188218822Sdim fprintf(stderr, "%s", GetImplicitConversionName(First)); 18992828Sobrien PrintedSomething = true; 19092828Sobrien } 191218822Sdim 192218822Sdim if (Second != ICK_Identity) { 193218822Sdim if (PrintedSomething) { 194218822Sdim fprintf(stderr, " -> "); 19592828Sobrien } 19692828Sobrien fprintf(stderr, "%s", GetImplicitConversionName(Second)); 19789857Sobrien 19889857Sobrien if (CopyConstructor) { 19989857Sobrien fprintf(stderr, " (by copy constructor)"); 200104834Sobrien } else if (DirectBinding) { 20189857Sobrien fprintf(stderr, " (direct reference binding)"); 20289857Sobrien } else if (ReferenceBinding) { 20389857Sobrien fprintf(stderr, " (reference binding)"); 20489857Sobrien } 205104834Sobrien PrintedSomething = true; 206130561Sobrien } 20789857Sobrien 208130561Sobrien if (Third != ICK_Identity) { 20989857Sobrien if (PrintedSomething) { 21089857Sobrien fprintf(stderr, " -> "); 21189857Sobrien } 21289857Sobrien fprintf(stderr, "%s", GetImplicitConversionName(Third)); 21389857Sobrien PrintedSomething = true; 214130561Sobrien } 215130561Sobrien 216130561Sobrien if (!PrintedSomething) { 21789857Sobrien fprintf(stderr, "No conversions required"); 218104834Sobrien } 21989857Sobrien} 22089857Sobrien 221130561Sobrien/// DebugPrint - Print this user-defined conversion sequence to standard 22289857Sobrien/// error. Useful for debugging overloading issues. 22389857Sobrienvoid UserDefinedConversionSequence::DebugPrint() const { 224130561Sobrien if (Before.First || Before.Second || Before.Third) { 22589857Sobrien Before.DebugPrint(); 22689857Sobrien fprintf(stderr, " -> "); 22789857Sobrien } 22889857Sobrien fprintf(stderr, "'%s'", ConversionFunction->getNameAsString().c_str()); 22989857Sobrien if (After.First || After.Second || After.Third) { 23089857Sobrien fprintf(stderr, " -> "); 231130561Sobrien After.DebugPrint(); 23289857Sobrien } 23389857Sobrien} 23489857Sobrien 23589857Sobrien/// DebugPrint - Print this implicit conversion sequence to standard 236130561Sobrien/// error. Useful for debugging overloading issues. 23789857Sobrienvoid ImplicitConversionSequence::DebugPrint() const { 23889857Sobrien switch (ConversionKind) { 239130561Sobrien case StandardConversion: 24089857Sobrien fprintf(stderr, "Standard conversion: "); 24189857Sobrien Standard.DebugPrint(); 24289857Sobrien break; 24389857Sobrien case UserDefinedConversion: 24489857Sobrien fprintf(stderr, "User-defined conversion: "); 24589857Sobrien UserDefined.DebugPrint(); 24689857Sobrien break; 247130561Sobrien case EllipsisConversion: 24889857Sobrien fprintf(stderr, "Ellipsis conversion"); 24989857Sobrien break; 25089857Sobrien case BadConversion: 25189857Sobrien fprintf(stderr, "Bad conversion"); 252130561Sobrien break; 25389857Sobrien } 254104834Sobrien 255130561Sobrien fprintf(stderr, "\n"); 25689857Sobrien} 25789857Sobrien 25889857Sobrien// IsOverload - Determine whether the given New declaration is an 25989857Sobrien// overload of the Old declaration. This routine returns false if New 26089857Sobrien// and Old cannot be overloaded, e.g., if they are functions with the 26189857Sobrien// same signature (C++ 1.3.10) or if the Old declaration isn't a 262130561Sobrien// function (or overload set). When it does return false and Old is an 26389857Sobrien// OverloadedFunctionDecl, MatchedDecl will be set to point to the 26489857Sobrien// FunctionDecl that New cannot be overloaded with. 26589857Sobrien// 26689857Sobrien// Example: Given the following input: 267130561Sobrien// 26889857Sobrien// void f(int, float); // #1 26989857Sobrien// void f(int, int); // #2 270130561Sobrien// int f(int, int); // #3 27189857Sobrien// 27289857Sobrien// When we process #1, there is no previous declaration of "f", 27389857Sobrien// so IsOverload will not be used. 27489857Sobrien// 27589857Sobrien// When we process #2, Old is a FunctionDecl for #1. By comparing the 27689857Sobrien// parameter types, we see that #1 and #2 are overloaded (since they 277130561Sobrien// have different signatures), so this routine returns false; 27889857Sobrien// MatchedDecl is unchanged. 27989857Sobrien// 28089857Sobrien// When we process #3, Old is an OverloadedFunctionDecl containing #1 28189857Sobrien// and #2. We compare the signatures of #3 to #1 (they're overloaded, 282130561Sobrien// so we do nothing) and then #3 to #2. Since the signatures of #3 and 28389857Sobrien// #2 are identical (return types of functions are not part of the 28489857Sobrien// signature), IsOverload returns false and MatchedDecl will be set to 285130561Sobrien// point to the FunctionDecl for #2. 28689857Sobrienbool 28789857SobrienSema::IsOverload(FunctionDecl *New, Decl* OldD, 28889857Sobrien OverloadedFunctionDecl::function_iterator& MatchedDecl) { 28989857Sobrien if (OverloadedFunctionDecl* Ovl = dyn_cast<OverloadedFunctionDecl>(OldD)) { 29089857Sobrien // Is this new function an overload of every function in the 29189857Sobrien // overload set? 292130561Sobrien OverloadedFunctionDecl::function_iterator Func = Ovl->function_begin(), 29389857Sobrien FuncEnd = Ovl->function_end(); 29489857Sobrien for (; Func != FuncEnd; ++Func) { 29589857Sobrien if (!IsOverload(New, *Func, MatchedDecl)) { 29689857Sobrien MatchedDecl = Func; 297130561Sobrien return false; 29889857Sobrien } 29989857Sobrien } 300130561Sobrien 30189857Sobrien // This function overloads every function in the overload set. 30289857Sobrien return true; 30389857Sobrien } else if (FunctionTemplateDecl *Old = dyn_cast<FunctionTemplateDecl>(OldD)) 30489857Sobrien return IsOverload(New, Old->getTemplatedDecl(), MatchedDecl); 30589857Sobrien else if (FunctionDecl* Old = dyn_cast<FunctionDecl>(OldD)) { 30689857Sobrien FunctionTemplateDecl *OldTemplate = Old->getDescribedFunctionTemplate(); 30789857Sobrien FunctionTemplateDecl *NewTemplate = New->getDescribedFunctionTemplate(); 308130561Sobrien 30989857Sobrien // C++ [temp.fct]p2: 31089857Sobrien // A function template can be overloaded with other function templates 31199461Sobrien // and with normal (non-template) functions. 31289857Sobrien if ((OldTemplate == 0) != (NewTemplate == 0)) 313130561Sobrien return true; 31489857Sobrien 31589857Sobrien // Is the function New an overload of the function Old? 316130561Sobrien QualType OldQType = Context.getCanonicalType(Old->getType()); 31789857Sobrien QualType NewQType = Context.getCanonicalType(New->getType()); 31889857Sobrien 31989857Sobrien // Compare the signatures (C++ 1.3.10) of the two functions to 32089857Sobrien // determine whether they are overloads. If we find any mismatch 32189857Sobrien // in the signature, they are overloads. 32289857Sobrien 32389857Sobrien // If either of these functions is a K&R-style function (no 324130561Sobrien // prototype), then we consider them to have matching signatures. 32589857Sobrien if (isa<FunctionNoProtoType>(OldQType.getTypePtr()) || 32689857Sobrien isa<FunctionNoProtoType>(NewQType.getTypePtr())) 327218822Sdim return false; 32889857Sobrien 329130561Sobrien FunctionProtoType* OldType = cast<FunctionProtoType>(OldQType); 33089857Sobrien FunctionProtoType* NewType = cast<FunctionProtoType>(NewQType); 331104834Sobrien 332130561Sobrien // The signature of a function includes the types of its 33389857Sobrien // parameters (C++ 1.3.10), which includes the presence or absence 33489857Sobrien // of the ellipsis; see C++ DR 357). 33589857Sobrien if (OldQType != NewQType && 33689857Sobrien (OldType->getNumArgs() != NewType->getNumArgs() || 33789857Sobrien OldType->isVariadic() != NewType->isVariadic() || 33889857Sobrien !std::equal(OldType->arg_type_begin(), OldType->arg_type_end(), 33989857Sobrien NewType->arg_type_begin()))) 34089857Sobrien return true; 341130561Sobrien 34289857Sobrien // C++ [temp.over.link]p4: 34389857Sobrien // The signature of a function template consists of its function 34499461Sobrien // signature, its return type and its template parameter list. The names 34589857Sobrien // of the template parameters are significant only for establishing the 346130561Sobrien // relationship between the template parameters and the rest of the 34789857Sobrien // signature. 348104834Sobrien // 349130561Sobrien // We check the return type and template parameter lists for function 35089857Sobrien // templates first; the remaining checks follow. 35189857Sobrien if (NewTemplate && 35289857Sobrien (!TemplateParameterListsAreEqual(NewTemplate->getTemplateParameters(), 35389857Sobrien OldTemplate->getTemplateParameters(), 35489857Sobrien false, TPL_TemplateMatch) || 35589857Sobrien OldType->getResultType() != NewType->getResultType())) 35689857Sobrien return true; 35789857Sobrien 358130561Sobrien // If the function is a class member, its signature includes the 35989857Sobrien // cv-qualifiers (if any) on the function itself. 36089857Sobrien // 36199461Sobrien // As part of this, also check whether one of the member functions 36289857Sobrien // is static, in which case they are not overloads (C++ 363130561Sobrien // 13.1p2). While not part of the definition of the signature, 36489857Sobrien // this check is important to determine whether these functions 365104834Sobrien // can be overloaded. 366130561Sobrien CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 36789857Sobrien CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 36889857Sobrien if (OldMethod && NewMethod && 36989857Sobrien !OldMethod->isStatic() && !NewMethod->isStatic() && 37089857Sobrien OldMethod->getTypeQualifiers() != NewMethod->getTypeQualifiers()) 37189857Sobrien return true; 37289857Sobrien 373130561Sobrien // The signatures match; this is not an overload. 37489857Sobrien return false; 37589857Sobrien } else { 376218822Sdim // (C++ 13p1): 37789857Sobrien // Only function declarations can be overloaded; object and type 378130561Sobrien // declarations cannot be overloaded. 37989857Sobrien return false; 380104834Sobrien } 381130561Sobrien} 38289857Sobrien 38389857Sobrien/// TryImplicitConversion - Attempt to perform an implicit conversion 38489857Sobrien/// from the given expression (Expr) to the given type (ToType). This 38589857Sobrien/// function returns an implicit conversion sequence that can be used 38689857Sobrien/// to perform the initialization. Given 38789857Sobrien/// 388130561Sobrien/// void f(float f); 38989857Sobrien/// void g(int i) { f(i); } 39089857Sobrien/// 391218822Sdim/// this routine would produce an implicit conversion sequence to 39289857Sobrien/// describe the initialization of f from i, which will be a standard 393130561Sobrien/// conversion sequence containing an lvalue-to-rvalue conversion (C++ 39489857Sobrien/// 4.1) followed by a floating-integral conversion (C++ 4.9). 395104834Sobrien// 396130561Sobrien/// Note that this routine only determines how the conversion can be 39789857Sobrien/// performed; it does not actually perform the conversion. As such, 39889857Sobrien/// it will not produce any diagnostics if no conversion is available, 39989857Sobrien/// but will instead return an implicit conversion sequence of kind 40089857Sobrien/// "BadConversion". 40189857Sobrien/// 40289857Sobrien/// If @p SuppressUserConversions, then user-defined conversions are 40389857Sobrien/// not permitted. 40489857Sobrien/// If @p AllowExplicit, then explicit user-defined conversions are 405130561Sobrien/// permitted. 40689857Sobrien/// If @p ForceRValue, then overloading is performed as if From was an rvalue, 40789857Sobrien/// no matter its actual lvalueness. 40899461Sobrien/// If @p UserCast, the implicit conversion is being done for a user-specified 40989857Sobrien/// cast. 410130561SobrienImplicitConversionSequence 41189857SobrienSema::TryImplicitConversion(Expr* From, QualType ToType, 412104834Sobrien bool SuppressUserConversions, 413130561Sobrien bool AllowExplicit, bool ForceRValue, 41489857Sobrien bool InOverloadResolution, 41589857Sobrien bool UserCast) { 41689857Sobrien ImplicitConversionSequence ICS; 41789857Sobrien OverloadCandidateSet Conversions; 41889857Sobrien OverloadingResult UserDefResult = OR_Success; 41989857Sobrien if (IsStandardConversion(From, ToType, InOverloadResolution, ICS.Standard)) 42089857Sobrien ICS.ConversionKind = ImplicitConversionSequence::StandardConversion; 42189857Sobrien else if (getLangOptions().CPlusPlus && 422130561Sobrien (UserDefResult = IsUserDefinedConversion(From, ToType, 42389857Sobrien ICS.UserDefined, 42489857Sobrien Conversions, 42599461Sobrien !SuppressUserConversions, AllowExplicit, 42689857Sobrien ForceRValue, UserCast)) == OR_Success) { 427130561Sobrien ICS.ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 42889857Sobrien // C++ [over.ics.user]p4: 429104834Sobrien // A conversion of an expression of class type to the same class 430130561Sobrien // type is given Exact Match rank, and a conversion of an 43189857Sobrien // expression of class type to a base class of that type is 43289857Sobrien // given Conversion rank, in spite of the fact that a copy 43389857Sobrien // constructor (i.e., a user-defined conversion function) is 43489857Sobrien // called for those cases. 43589857Sobrien if (CXXConstructorDecl *Constructor 43689857Sobrien = dyn_cast<CXXConstructorDecl>(ICS.UserDefined.ConversionFunction)) { 43789857Sobrien QualType FromCanon 438130561Sobrien = Context.getCanonicalType(From->getType().getUnqualifiedType()); 43989857Sobrien QualType ToCanon = Context.getCanonicalType(ToType).getUnqualifiedType(); 44089857Sobrien if (FromCanon == ToCanon || IsDerivedFrom(FromCanon, ToCanon)) { 44199461Sobrien // Turn this into a "standard" conversion sequence, so that it 44289857Sobrien // gets ranked with standard conversion sequences. 443130561Sobrien ICS.ConversionKind = ImplicitConversionSequence::StandardConversion; 44489857Sobrien ICS.Standard.setAsIdentityConversion(); 44589857Sobrien ICS.Standard.FromTypePtr = From->getType().getAsOpaquePtr(); 446130561Sobrien ICS.Standard.ToTypePtr = ToType.getAsOpaquePtr(); 44789857Sobrien ICS.Standard.CopyConstructor = Constructor; 44889857Sobrien if (ToCanon != FromCanon) 44989857Sobrien ICS.Standard.Second = ICK_Derived_To_Base; 45089857Sobrien } 45189857Sobrien } 45289857Sobrien 45389857Sobrien // C++ [over.best.ics]p4: 454130561Sobrien // However, when considering the argument of a user-defined 45589857Sobrien // conversion function that is a candidate by 13.3.1.3 when 45689857Sobrien // invoked for the copying of the temporary in the second step 45799461Sobrien // of a class copy-initialization, or by 13.3.1.4, 13.3.1.5, or 45889857Sobrien // 13.3.1.6 in all cases, only standard conversion sequences and 459130561Sobrien // ellipsis conversion sequences are allowed. 46089857Sobrien if (SuppressUserConversions && 46189857Sobrien ICS.ConversionKind == ImplicitConversionSequence::UserDefinedConversion) 462130561Sobrien ICS.ConversionKind = ImplicitConversionSequence::BadConversion; 46389857Sobrien } else { 46489857Sobrien ICS.ConversionKind = ImplicitConversionSequence::BadConversion; 46589857Sobrien if (UserDefResult == OR_Ambiguous) { 46689857Sobrien for (OverloadCandidateSet::iterator Cand = Conversions.begin(); 46789857Sobrien Cand != Conversions.end(); ++Cand) 46889857Sobrien if (Cand->Viable) 46989857Sobrien ICS.ConversionFunctionSet.push_back(Cand->Function); 470130561Sobrien } 47189857Sobrien } 47289857Sobrien 47399461Sobrien return ICS; 47489857Sobrien} 475130561Sobrien 47689857Sobrien/// IsStandardConversion - Determines whether there is a standard 47789857Sobrien/// conversion sequence (C++ [conv], C++ [over.ics.scs]) from the 478130561Sobrien/// expression From to the type ToType. Standard conversion sequences 47989857Sobrien/// only consider non-class types; for conversions that involve class 48089857Sobrien/// types, use TryImplicitConversion. If a conversion exists, SCS will 48189857Sobrien/// contain the standard conversion sequence required to perform this 48289857Sobrien/// conversion and this routine will return true. Otherwise, this 48389857Sobrien/// routine will return false and the value of SCS is unspecified. 48489857Sobrienbool 48589857SobrienSema::IsStandardConversion(Expr* From, QualType ToType, 486130561Sobrien bool InOverloadResolution, 48789857Sobrien StandardConversionSequence &SCS) { 48889857Sobrien QualType FromType = From->getType(); 48999461Sobrien 49089857Sobrien // Standard conversions (C++ [conv]) 491130561Sobrien SCS.setAsIdentityConversion(); 49289857Sobrien SCS.Deprecated = false; 49389857Sobrien SCS.IncompatibleObjC = false; 494130561Sobrien SCS.FromTypePtr = FromType.getAsOpaquePtr(); 49589857Sobrien SCS.CopyConstructor = 0; 49689857Sobrien 49789857Sobrien // There are no standard conversions for class types in C++, so 49889857Sobrien // abort early. When overloading in C, however, we do permit 49989857Sobrien if (FromType->isRecordType() || ToType->isRecordType()) { 50089857Sobrien if (getLangOptions().CPlusPlus) 50189857Sobrien return false; 50289857Sobrien 503104834Sobrien // When we're overloading in C, we allow, as standard conversions, 504104834Sobrien } 505130561Sobrien 50689857Sobrien // The first conversion can be an lvalue-to-rvalue conversion, 507104834Sobrien // array-to-pointer conversion, or function-to-pointer conversion 508104834Sobrien // (C++ 4p1). 50989857Sobrien 510130561Sobrien // Lvalue-to-rvalue conversion (C++ 4.1): 51189857Sobrien // An lvalue (3.10) of a non-function, non-array type T can be 51289857Sobrien // converted to an rvalue. 513130561Sobrien Expr::isLvalueResult argIsLvalue = From->isLvalue(Context); 51489857Sobrien if (argIsLvalue == Expr::LV_Valid && 51589857Sobrien !FromType->isFunctionType() && !FromType->isArrayType() && 51689857Sobrien Context.getCanonicalType(FromType) != Context.OverloadTy) { 51789857Sobrien SCS.First = ICK_Lvalue_To_Rvalue; 51889857Sobrien 51989857Sobrien // If T is a non-class type, the type of the rvalue is the 52089857Sobrien // cv-unqualified version of T. Otherwise, the type of the rvalue 521130561Sobrien // is T (C++ 4.1p1). C++ can't get here with class types; in C, we 52289857Sobrien // just strip the qualifiers because they don't matter. 52389857Sobrien FromType = FromType.getUnqualifiedType(); 52499461Sobrien } else if (FromType->isArrayType()) { 52589857Sobrien // Array-to-pointer conversion (C++ 4.2) 526130561Sobrien SCS.First = ICK_Array_To_Pointer; 52789857Sobrien 528104834Sobrien // An lvalue or rvalue of type "array of N T" or "array of unknown 529130561Sobrien // bound of T" can be converted to an rvalue of type "pointer to 53089857Sobrien // T" (C++ 4.2p1). 53189857Sobrien FromType = Context.getArrayDecayedType(FromType); 53289857Sobrien 53389857Sobrien if (IsStringLiteralToNonConstPointerConversion(From, ToType)) { 53489857Sobrien // This conversion is deprecated. (C++ D.4). 53589857Sobrien SCS.Deprecated = true; 53689857Sobrien 537130561Sobrien // For the purpose of ranking in overload resolution 53889857Sobrien // (13.3.3.1.1), this conversion is considered an 53989857Sobrien // array-to-pointer conversion followed by a qualification 54099461Sobrien // conversion (4.4). (C++ 4.2p2) 54189857Sobrien SCS.Second = ICK_Identity; 542130561Sobrien SCS.Third = ICK_Qualification; 54389857Sobrien SCS.ToTypePtr = ToType.getAsOpaquePtr(); 54489857Sobrien return true; 545130561Sobrien } 54689857Sobrien } else if (FromType->isFunctionType() && argIsLvalue == Expr::LV_Valid) { 54789857Sobrien // Function-to-pointer conversion (C++ 4.3). 54889857Sobrien SCS.First = ICK_Function_To_Pointer; 54989857Sobrien 55089857Sobrien // An lvalue of function type T can be converted to an rvalue of 55189857Sobrien // type "pointer to T." The result is a pointer to the 55289857Sobrien // function. (C++ 4.3p1). 55389857Sobrien FromType = Context.getPointerType(FromType); 554130561Sobrien } else if (FunctionDecl *Fn 55589857Sobrien = ResolveAddressOfOverloadedFunction(From, ToType, false)) { 55689857Sobrien // Address of overloaded function (C++ [over.over]). 55789857Sobrien SCS.First = ICK_Function_To_Pointer; 55889857Sobrien 559130561Sobrien // We were able to resolve the address of the overloaded function, 56089857Sobrien // so we can convert to the type of that function. 561104834Sobrien FromType = Fn->getType(); 562130561Sobrien if (ToType->isLValueReferenceType()) 56389857Sobrien FromType = Context.getLValueReferenceType(FromType); 56489857Sobrien else if (ToType->isRValueReferenceType()) 56589857Sobrien FromType = Context.getRValueReferenceType(FromType); 56689857Sobrien else if (ToType->isMemberPointerType()) { 56789857Sobrien // Resolve address only succeeds if both sides are member pointers, 56889857Sobrien // but it doesn't have to be the same class. See DR 247. 569130561Sobrien // Note that this means that the type of &Derived::fn can be 57089857Sobrien // Ret (Base::*)(Args) if the fn overload actually found is from the 57189857Sobrien // base class, even if it was brought into the derived class via a 57289857Sobrien // using declaration. The standard isn't clear on this issue at all. 57389857Sobrien CXXMethodDecl *M = cast<CXXMethodDecl>(Fn); 574130561Sobrien FromType = Context.getMemberPointerType(FromType, 57589857Sobrien Context.getTypeDeclType(M->getParent()).getTypePtr()); 57689857Sobrien } else 577130561Sobrien FromType = Context.getPointerType(FromType); 57889857Sobrien } else { 57989857Sobrien // We don't require any conversions for the first step. 58089857Sobrien SCS.First = ICK_Identity; 58189857Sobrien } 58289857Sobrien 58389857Sobrien // The second conversion can be an integral promotion, floating 584130561Sobrien // point promotion, integral conversion, floating point conversion, 58589857Sobrien // floating-integral conversion, pointer conversion, 58689857Sobrien // pointer-to-member conversion, or boolean conversion (C++ 4p1). 58789857Sobrien // For overloading in C, this can also be a "compatible-type" 58889857Sobrien // conversion. 589130561Sobrien bool IncompatibleObjC = false; 59089857Sobrien if (Context.hasSameUnqualifiedType(FromType, ToType)) { 59189857Sobrien // The unqualified versions of the types are the same: there's no 592130561Sobrien // conversion to do. 59389857Sobrien SCS.Second = ICK_Identity; 59489857Sobrien } else if (IsIntegralPromotion(From, FromType, ToType)) { 59589857Sobrien // Integral promotion (C++ 4.5). 59689857Sobrien SCS.Second = ICK_Integral_Promotion; 59789857Sobrien FromType = ToType.getUnqualifiedType(); 59889857Sobrien } else if (IsFloatingPointPromotion(FromType, ToType)) { 599130561Sobrien // Floating point promotion (C++ 4.6). 60089857Sobrien SCS.Second = ICK_Floating_Promotion; 601104834Sobrien FromType = ToType.getUnqualifiedType(); 60289857Sobrien } else if (IsComplexPromotion(FromType, ToType)) { 60389857Sobrien // Complex promotion (Clang extension) 60489857Sobrien SCS.Second = ICK_Complex_Promotion; 605130561Sobrien FromType = ToType.getUnqualifiedType(); 60689857Sobrien } else if ((FromType->isIntegralType() || FromType->isEnumeralType()) && 60789857Sobrien (ToType->isIntegralType() && !ToType->isEnumeralType())) { 608130561Sobrien // Integral conversions (C++ 4.7). 60989857Sobrien // FIXME: isIntegralType shouldn't be true for enums in C++. 61089857Sobrien SCS.Second = ICK_Integral_Conversion; 61189857Sobrien FromType = ToType.getUnqualifiedType(); 61289857Sobrien } else if (FromType->isFloatingType() && ToType->isFloatingType()) { 61389857Sobrien // Floating point conversions (C++ 4.8). 61489857Sobrien SCS.Second = ICK_Floating_Conversion; 615130561Sobrien FromType = ToType.getUnqualifiedType(); 61689857Sobrien } else if (FromType->isComplexType() && ToType->isComplexType()) { 61789857Sobrien // Complex conversions (C99 6.3.1.6) 61899461Sobrien SCS.Second = ICK_Complex_Conversion; 61989857Sobrien FromType = ToType.getUnqualifiedType(); 620130561Sobrien } else if ((FromType->isFloatingType() && 62189857Sobrien ToType->isIntegralType() && (!ToType->isBooleanType() && 622104834Sobrien !ToType->isEnumeralType())) || 623130561Sobrien ((FromType->isIntegralType() || FromType->isEnumeralType()) && 62489857Sobrien ToType->isFloatingType())) { 62589857Sobrien // Floating-integral conversions (C++ 4.9). 62689857Sobrien // FIXME: isIntegralType shouldn't be true for enums in C++. 62789857Sobrien SCS.Second = ICK_Floating_Integral; 62889857Sobrien FromType = ToType.getUnqualifiedType(); 62989857Sobrien } else if ((FromType->isComplexType() && ToType->isArithmeticType()) || 63089857Sobrien (ToType->isComplexType() && FromType->isArithmeticType())) { 631130561Sobrien // Complex-real conversions (C99 6.3.1.7) 63289857Sobrien SCS.Second = ICK_Complex_Real; 63389857Sobrien FromType = ToType.getUnqualifiedType(); 63489857Sobrien } else if (IsPointerConversion(From, FromType, ToType, InOverloadResolution, 63589857Sobrien FromType, IncompatibleObjC)) { 636130561Sobrien // Pointer conversions (C++ 4.10). 63789857Sobrien SCS.Second = ICK_Pointer_Conversion; 638104834Sobrien SCS.IncompatibleObjC = IncompatibleObjC; 639130561Sobrien } else if (IsMemberPointerConversion(From, FromType, ToType, 64089857Sobrien InOverloadResolution, FromType)) { 64189857Sobrien // Pointer to member conversions (4.11). 64289857Sobrien SCS.Second = ICK_Pointer_Member; 64389857Sobrien } else if (ToType->isBooleanType() && 64489857Sobrien (FromType->isArithmeticType() || 64589857Sobrien FromType->isEnumeralType() || 64689857Sobrien FromType->isPointerType() || 647130561Sobrien FromType->isBlockPointerType() || 64889857Sobrien FromType->isMemberPointerType() || 64989857Sobrien FromType->isNullPtrType())) { 65099461Sobrien // Boolean conversions (C++ 4.12). 65189857Sobrien SCS.Second = ICK_Boolean_Conversion; 652130561Sobrien FromType = Context.BoolTy; 65389857Sobrien } else if (!getLangOptions().CPlusPlus && 65489857Sobrien Context.typesAreCompatible(ToType, FromType)) { 655130561Sobrien // Compatible conversions (Clang extension for C function overloading) 65689857Sobrien SCS.Second = ICK_Compatible_Conversion; 65789857Sobrien } else { 65889857Sobrien // No second conversion required. 65989857Sobrien SCS.Second = ICK_Identity; 66089857Sobrien } 66189857Sobrien 66289857Sobrien QualType CanonFrom; 663130561Sobrien QualType CanonTo; 66489857Sobrien // The third conversion can be a qualification conversion (C++ 4p1). 66589857Sobrien if (IsQualificationConversion(FromType, ToType)) { 66699461Sobrien SCS.Third = ICK_Qualification; 66789857Sobrien FromType = ToType; 668130561Sobrien CanonFrom = Context.getCanonicalType(FromType); 66989857Sobrien CanonTo = Context.getCanonicalType(ToType); 67089857Sobrien } else { 671130561Sobrien // No conversion required 67289857Sobrien SCS.Third = ICK_Identity; 67389857Sobrien 67489857Sobrien // C++ [over.best.ics]p6: 67589857Sobrien // [...] Any difference in top-level cv-qualification is 67689857Sobrien // subsumed by the initialization itself and does not constitute 67789857Sobrien // a conversion. [...] 67889857Sobrien CanonFrom = Context.getCanonicalType(FromType); 679130561Sobrien CanonTo = Context.getCanonicalType(ToType); 68089857Sobrien if (CanonFrom.getLocalUnqualifiedType() 68189857Sobrien == CanonTo.getLocalUnqualifiedType() && 68299461Sobrien CanonFrom.getLocalCVRQualifiers() != CanonTo.getLocalCVRQualifiers()) { 68389857Sobrien FromType = ToType; 684130561Sobrien CanonFrom = CanonTo; 68589857Sobrien } 68689857Sobrien } 687130561Sobrien 68889857Sobrien // If we have not converted the argument type to the parameter type, 68999461Sobrien // this is a bad conversion sequence. 69089857Sobrien if (CanonFrom != CanonTo) 69189857Sobrien return false; 69299461Sobrien 69399461Sobrien SCS.ToTypePtr = FromType.getAsOpaquePtr(); 694130561Sobrien return true; 69589857Sobrien} 69689857Sobrien 69799461Sobrien/// IsIntegralPromotion - Determines whether the conversion from the 69889857Sobrien/// expression From (whose potentially-adjusted type is FromType) to 699130561Sobrien/// ToType is an integral promotion (C++ 4.5). If so, returns true and 70089857Sobrien/// sets PromotedType to the promoted type. 70199461Sobrienbool Sema::IsIntegralPromotion(Expr *From, QualType FromType, QualType ToType) { 702130561Sobrien const BuiltinType *To = ToType->getAs<BuiltinType>(); 70389857Sobrien // All integers are built-in. 70499461Sobrien if (!To) { 70589857Sobrien return false; 70689857Sobrien } 70789857Sobrien 70889857Sobrien // An rvalue of type char, signed char, unsigned char, short int, or 709130561Sobrien // unsigned short int can be converted to an rvalue of type int if 71089857Sobrien // int can represent all the values of the source type; otherwise, 71189857Sobrien // the source rvalue can be converted to an rvalue of type unsigned 71299461Sobrien // int (C++ 4.5p1). 71389857Sobrien if (FromType->isPromotableIntegerType() && !FromType->isBooleanType()) { 714130561Sobrien if (// We can promote any signed, promotable integer type to an int 71589857Sobrien (FromType->isSignedIntegerType() || 71689857Sobrien // We can promote any unsigned integer type whose size is 717130561Sobrien // less than int to an int. 71889857Sobrien (!FromType->isSignedIntegerType() && 71989857Sobrien Context.getTypeSize(FromType) < Context.getTypeSize(ToType)))) { 72089857Sobrien return To->getKind() == BuiltinType::Int; 72189857Sobrien } 72289857Sobrien 72389857Sobrien return To->getKind() == BuiltinType::UInt; 724130561Sobrien } 72589857Sobrien 72689857Sobrien // An rvalue of type wchar_t (3.9.1) or an enumeration type (7.2) 72799461Sobrien // can be converted to an rvalue of the first of the following types 72889857Sobrien // that can represent all the values of its underlying type: int, 729130561Sobrien // unsigned int, long, or unsigned long (C++ 4.5p2). 73089857Sobrien if ((FromType->isEnumeralType() || FromType->isWideCharType()) 73189857Sobrien && ToType->isIntegerType()) { 732130561Sobrien // Determine whether the type we're converting from is signed or 73389857Sobrien // unsigned. 73489857Sobrien bool FromIsSigned; 73589857Sobrien uint64_t FromSize = Context.getTypeSize(FromType); 73689857Sobrien if (const EnumType *FromEnumType = FromType->getAs<EnumType>()) { 73789857Sobrien QualType UnderlyingType = FromEnumType->getDecl()->getIntegerType(); 73889857Sobrien FromIsSigned = UnderlyingType->isSignedIntegerType(); 739130561Sobrien } else { 74089857Sobrien // FIXME: Is wchar_t signed or unsigned? We assume it's signed for now. 74189857Sobrien FromIsSigned = true; 74299461Sobrien } 74389857Sobrien 744130561Sobrien // The types we'll try to promote to, in the appropriate 74589857Sobrien // order. Try each of these types. 74689857Sobrien QualType PromoteTypes[6] = { 747130561Sobrien Context.IntTy, Context.UnsignedIntTy, 74889857Sobrien Context.LongTy, Context.UnsignedLongTy , 749130561Sobrien Context.LongLongTy, Context.UnsignedLongLongTy 750130561Sobrien }; 75189857Sobrien for (int Idx = 0; Idx < 6; ++Idx) { 75289857Sobrien uint64_t ToSize = Context.getTypeSize(PromoteTypes[Idx]); 75389857Sobrien if (FromSize < ToSize || 754130561Sobrien (FromSize == ToSize && 75589857Sobrien FromIsSigned == PromoteTypes[Idx]->isSignedIntegerType())) { 75689857Sobrien // We found the type that we can promote to. If this is the 75789857Sobrien // type we wanted, we have a promotion. Otherwise, no 758130561Sobrien // promotion. 759130561Sobrien return Context.hasSameUnqualifiedType(ToType, PromoteTypes[Idx]); 76089857Sobrien } 76189857Sobrien } 762130561Sobrien } 76389857Sobrien 76489857Sobrien // An rvalue for an integral bit-field (9.6) can be converted to an 76589857Sobrien // rvalue of type int if int can represent all the values of the 76689857Sobrien // bit-field; otherwise, it can be converted to unsigned int if 76789857Sobrien // unsigned int can represent all the values of the bit-field. If 76889857Sobrien // the bit-field is larger yet, no integral promotion applies to 76989857Sobrien // it. If the bit-field has an enumerated type, it is treated as any 77089857Sobrien // other value of that type for promotion purposes (C++ 4.5p3). 771130561Sobrien // FIXME: We should delay checking of bit-fields until we actually perform the 77289857Sobrien // conversion. 77389857Sobrien using llvm::APSInt; 77489857Sobrien if (From) 77589857Sobrien if (FieldDecl *MemberDecl = From->getBitField()) { 776130561Sobrien APSInt BitWidth; 77789857Sobrien if (FromType->isIntegralType() && !FromType->isEnumeralType() && 778104834Sobrien MemberDecl->getBitWidth()->isIntegerConstantExpr(BitWidth, Context)) { 779130561Sobrien APSInt ToSize(BitWidth.getBitWidth(), BitWidth.isUnsigned()); 78089857Sobrien ToSize = Context.getTypeSize(ToType); 78189857Sobrien 78289857Sobrien // Are we promoting to an int from a bitfield that fits in an int? 78389857Sobrien if (BitWidth < ToSize || 78489857Sobrien (FromType->isSignedIntegerType() && BitWidth <= ToSize)) { 78589857Sobrien return To->getKind() == BuiltinType::Int; 786130561Sobrien } 78789857Sobrien 78889857Sobrien // Are we promoting to an unsigned int from an unsigned bitfield 78989857Sobrien // that fits into an unsigned int? 79089857Sobrien if (FromType->isUnsignedIntegerType() && BitWidth <= ToSize) { 791130561Sobrien return To->getKind() == BuiltinType::UInt; 79289857Sobrien } 79389857Sobrien 794130561Sobrien return false; 79589857Sobrien } 79689857Sobrien } 79789857Sobrien 79889857Sobrien // An rvalue of type bool can be converted to an rvalue of type int, 79989857Sobrien // with false becoming zero and true becoming one (C++ 4.5p4). 80089857Sobrien if (FromType->isBooleanType() && To->getKind() == BuiltinType::Int) { 80189857Sobrien return true; 802130561Sobrien } 80389857Sobrien 80489857Sobrien return false; 80599461Sobrien} 80689857Sobrien 807130561Sobrien/// IsFloatingPointPromotion - Determines whether the conversion from 80889857Sobrien/// FromType to ToType is a floating point promotion (C++ 4.6). If so, 80989857Sobrien/// returns true and sets PromotedType to the promoted type. 810130561Sobrienbool Sema::IsFloatingPointPromotion(QualType FromType, QualType ToType) { 81189857Sobrien /// An rvalue of type float can be converted to an rvalue of type 81289857Sobrien /// double. (C++ 4.6p1). 81389857Sobrien if (const BuiltinType *FromBuiltin = FromType->getAs<BuiltinType>()) 81489857Sobrien if (const BuiltinType *ToBuiltin = ToType->getAs<BuiltinType>()) { 81589857Sobrien if (FromBuiltin->getKind() == BuiltinType::Float && 81689857Sobrien ToBuiltin->getKind() == BuiltinType::Double) 817130561Sobrien return true; 81889857Sobrien 81989857Sobrien // C99 6.3.1.5p1: 82089857Sobrien // When a float is promoted to double or long double, or a 82189857Sobrien // double is promoted to long double [...]. 822130561Sobrien if (!getLangOptions().CPlusPlus && 82389857Sobrien (FromBuiltin->getKind() == BuiltinType::Float || 82489857Sobrien FromBuiltin->getKind() == BuiltinType::Double) && 825130561Sobrien (ToBuiltin->getKind() == BuiltinType::LongDouble)) 82689857Sobrien return true; 82789857Sobrien } 82889857Sobrien 82989857Sobrien return false; 83089857Sobrien} 83189857Sobrien 83289857Sobrien/// \brief Determine if a conversion is a complex promotion. 833130561Sobrien/// 83489857Sobrien/// A complex promotion is defined as a complex -> complex conversion 83589857Sobrien/// where the conversion between the underlying real types is a 83699461Sobrien/// floating-point or integral promotion. 83789857Sobrienbool Sema::IsComplexPromotion(QualType FromType, QualType ToType) { 838130561Sobrien const ComplexType *FromComplex = FromType->getAs<ComplexType>(); 83989857Sobrien if (!FromComplex) 84089857Sobrien return false; 841130561Sobrien 84289857Sobrien const ComplexType *ToComplex = ToType->getAs<ComplexType>(); 84389857Sobrien if (!ToComplex) 84489857Sobrien return false; 84589857Sobrien 84689857Sobrien return IsFloatingPointPromotion(FromComplex->getElementType(), 84789857Sobrien ToComplex->getElementType()) || 848130561Sobrien IsIntegralPromotion(0, FromComplex->getElementType(), 84989857Sobrien ToComplex->getElementType()); 85089857Sobrien} 85189857Sobrien 85289857Sobrien/// BuildSimilarlyQualifiedPointerType - In a pointer conversion from 853130561Sobrien/// the pointer type FromPtr to a pointer to type ToPointee, with the 85489857Sobrien/// same type qualifiers as FromPtr has on its pointee type. ToType, 855104834Sobrien/// if non-empty, will be a pointer to ToType that may or may not have 856130561Sobrien/// the right set of qualifiers on its pointee. 85789857Sobrienstatic QualType 85889857SobrienBuildSimilarlyQualifiedPointerType(const PointerType *FromPtr, 85989857Sobrien QualType ToPointee, QualType ToType, 86089857Sobrien ASTContext &Context) { 86189857Sobrien QualType CanonFromPointee = Context.getCanonicalType(FromPtr->getPointeeType()); 86289857Sobrien QualType CanonToPointee = Context.getCanonicalType(ToPointee); 863130561Sobrien Qualifiers Quals = CanonFromPointee.getQualifiers(); 86489857Sobrien 86589857Sobrien // Exact qualifier match -> return the pointer type we're converting to. 86689857Sobrien if (CanonToPointee.getLocalQualifiers() == Quals) { 86789857Sobrien // ToType is exactly what we need. Return it. 868130561Sobrien if (!ToType.isNull()) 86989857Sobrien return ToType; 870104834Sobrien 871130561Sobrien // Build a pointer to ToPointee. It has the right qualifiers 87289857Sobrien // already. 873104834Sobrien return Context.getPointerType(ToPointee); 87489857Sobrien } 87589857Sobrien 87689857Sobrien // Just build a canonical type that has the right qualifiers. 87789857Sobrien return Context.getPointerType( 878130561Sobrien Context.getQualifiedType(CanonToPointee.getLocalUnqualifiedType(), 87989857Sobrien Quals)); 88089857Sobrien} 88199461Sobrien 88289857Sobrienstatic bool isNullPointerConstantForConversion(Expr *Expr, 883130561Sobrien bool InOverloadResolution, 88489857Sobrien ASTContext &Context) { 885104834Sobrien // Handle value-dependent integral null pointer constants correctly. 886130561Sobrien // http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903 88789857Sobrien if (Expr->isValueDependent() && !Expr->isTypeDependent() && 88889857Sobrien Expr->getType()->isIntegralType()) 88989857Sobrien return !InOverloadResolution; 89089857Sobrien 89189857Sobrien return Expr->isNullPointerConstant(Context, 89289857Sobrien InOverloadResolution? Expr::NPC_ValueDependentIsNotNull 89389857Sobrien : Expr::NPC_ValueDependentIsNull); 89489857Sobrien} 895130561Sobrien 89689857Sobrien/// IsPointerConversion - Determines whether the conversion of the 89789857Sobrien/// expression From, which has the (possibly adjusted) type FromType, 89899461Sobrien/// can be converted to the type ToType via a pointer conversion (C++ 89989857Sobrien/// 4.10). If so, returns true and places the converted type (that 900130561Sobrien/// might differ from ToType in its cv-qualifiers at some level) into 90189857Sobrien/// ConvertedType. 902104834Sobrien/// 903130561Sobrien/// This routine also supports conversions to and from block pointers 90489857Sobrien/// and conversions with Objective-C's 'id', 'id<protocols...>', and 90589857Sobrien/// pointers to interfaces. FIXME: Once we've determined the 90689857Sobrien/// appropriate overloading rules for Objective-C, we may want to 90789857Sobrien/// split the Objective-C checks into a different routine; however, 90889857Sobrien/// GCC seems to consider all of these conversions to be pointer 90989857Sobrien/// conversions, so for now they live here. IncompatibleObjC will be 91089857Sobrien/// set if the conversion is an allowed Objective-C conversion that 91189857Sobrien/// should result in a warning. 912130561Sobrienbool Sema::IsPointerConversion(Expr *From, QualType FromType, QualType ToType, 91389857Sobrien bool InOverloadResolution, 91489857Sobrien QualType& ConvertedType, 91599461Sobrien bool &IncompatibleObjC) { 91689857Sobrien IncompatibleObjC = false; 917130561Sobrien if (isObjCPointerConversion(FromType, ToType, ConvertedType, IncompatibleObjC)) 91889857Sobrien return true; 91989857Sobrien 920130561Sobrien // Conversion from a null pointer constant to any Objective-C pointer type. 92189857Sobrien if (ToType->isObjCObjectPointerType() && 92289857Sobrien isNullPointerConstantForConversion(From, InOverloadResolution, Context)) { 92389857Sobrien ConvertedType = ToType; 92489857Sobrien return true; 92589857Sobrien } 92689857Sobrien 92789857Sobrien // Blocks: Block pointers can be converted to void*. 92889857Sobrien if (FromType->isBlockPointerType() && ToType->isPointerType() && 929130561Sobrien ToType->getAs<PointerType>()->getPointeeType()->isVoidType()) { 93089857Sobrien ConvertedType = ToType; 93189857Sobrien return true; 93299461Sobrien } 93389857Sobrien // Blocks: A null pointer constant can be converted to a block 934130561Sobrien // pointer type. 93589857Sobrien if (ToType->isBlockPointerType() && 93689857Sobrien isNullPointerConstantForConversion(From, InOverloadResolution, Context)) { 937130561Sobrien ConvertedType = ToType; 93889857Sobrien return true; 93989857Sobrien } 94089857Sobrien 94189857Sobrien // If the left-hand-side is nullptr_t, the right side can be a null 94289857Sobrien // pointer constant. 94389857Sobrien if (ToType->isNullPtrType() && 94489857Sobrien isNullPointerConstantForConversion(From, InOverloadResolution, Context)) { 94589857Sobrien ConvertedType = ToType; 946130561Sobrien return true; 94789857Sobrien } 94889857Sobrien 94999461Sobrien const PointerType* ToTypePtr = ToType->getAs<PointerType>(); 95089857Sobrien if (!ToTypePtr) 951130561Sobrien return false; 95289857Sobrien 95389857Sobrien // A null pointer constant can be converted to a pointer type (C++ 4.10p1). 954130561Sobrien if (isNullPointerConstantForConversion(From, InOverloadResolution, Context)) { 95589857Sobrien ConvertedType = ToType; 95689857Sobrien return true; 95789857Sobrien } 95889857Sobrien 95989857Sobrien // Beyond this point, both types need to be pointers. 96089857Sobrien const PointerType *FromTypePtr = FromType->getAs<PointerType>(); 96189857Sobrien if (!FromTypePtr) 96289857Sobrien return false; 96389857Sobrien 96489857Sobrien QualType FromPointeeType = FromTypePtr->getPointeeType(); 965130561Sobrien QualType ToPointeeType = ToTypePtr->getPointeeType(); 96689857Sobrien 96789857Sobrien // An rvalue of type "pointer to cv T," where T is an object type, 96899461Sobrien // can be converted to an rvalue of type "pointer to cv void" (C++ 96989857Sobrien // 4.10p2). 970130561Sobrien if (FromPointeeType->isObjectType() && ToPointeeType->isVoidType()) { 97189857Sobrien ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, 97289857Sobrien ToPointeeType, 973130561Sobrien ToType, Context); 97489857Sobrien return true; 97589857Sobrien } 97689857Sobrien 97789857Sobrien // When we're overloading in C, we allow a special kind of pointer 97889857Sobrien // conversion for compatible-but-not-identical pointee types. 97989857Sobrien if (!getLangOptions().CPlusPlus && 98089857Sobrien Context.typesAreCompatible(FromPointeeType, ToPointeeType)) { 98189857Sobrien ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, 982130561Sobrien ToPointeeType, 98389857Sobrien ToType, Context); 98489857Sobrien return true; 98599461Sobrien } 98689857Sobrien 987130561Sobrien // C++ [conv.ptr]p3: 98889857Sobrien // 989104834Sobrien // An rvalue of type "pointer to cv D," where D is a class type, 990130561Sobrien // can be converted to an rvalue of type "pointer to cv B," where 99189857Sobrien // B is a base class (clause 10) of D. If B is an inaccessible 99289857Sobrien // (clause 11) or ambiguous (10.2) base class of D, a program that 99389857Sobrien // necessitates this conversion is ill-formed. The result of the 99489857Sobrien // conversion is a pointer to the base class sub-object of the 99589857Sobrien // derived class object. The null pointer value is converted to 99689857Sobrien // the null pointer value of the destination type. 99789857Sobrien // 99889857Sobrien // Note that we do not check for ambiguity or inaccessibility 99989857Sobrien // here. That is handled by CheckPointerConversion. 100089857Sobrien if (getLangOptions().CPlusPlus && 100189857Sobrien FromPointeeType->isRecordType() && ToPointeeType->isRecordType() && 100289857Sobrien !RequireCompleteType(From->getLocStart(), FromPointeeType, PDiag()) && 100389857Sobrien IsDerivedFrom(FromPointeeType, ToPointeeType)) { 100489857Sobrien ConvertedType = BuildSimilarlyQualifiedPointerType(FromTypePtr, 1005130561Sobrien ToPointeeType, 100689857Sobrien ToType, Context); 100789857Sobrien return true; 100899461Sobrien } 100989857Sobrien 1010130561Sobrien return false; 101189857Sobrien} 101289857Sobrien 1013130561Sobrien/// isObjCPointerConversion - Determines whether this is an 101489857Sobrien/// Objective-C pointer conversion. Subroutine of IsPointerConversion, 101589857Sobrien/// with the same arguments and return values. 101689857Sobrienbool Sema::isObjCPointerConversion(QualType FromType, QualType ToType, 101789857Sobrien QualType& ConvertedType, 101889857Sobrien bool &IncompatibleObjC) { 101989857Sobrien if (!getLangOptions().ObjC1) 102089857Sobrien return false; 1021130561Sobrien 102289857Sobrien // First, we handle all conversions on ObjC object pointer types. 102389857Sobrien const ObjCObjectPointerType* ToObjCPtr = ToType->getAs<ObjCObjectPointerType>(); 102499461Sobrien const ObjCObjectPointerType *FromObjCPtr = 102589857Sobrien FromType->getAs<ObjCObjectPointerType>(); 1026130561Sobrien 102789857Sobrien if (ToObjCPtr && FromObjCPtr) { 102889857Sobrien // Objective C++: We're able to convert between "id" or "Class" and a 1029130561Sobrien // pointer to any interface (in both directions). 103089857Sobrien if (ToObjCPtr->isObjCBuiltinType() && FromObjCPtr->isObjCBuiltinType()) { 103189857Sobrien ConvertedType = ToType; 103289857Sobrien return true; 103389857Sobrien } 103489857Sobrien // Conversions with Objective-C's id<...>. 103589857Sobrien if ((FromObjCPtr->isObjCQualifiedIdType() || 103689857Sobrien ToObjCPtr->isObjCQualifiedIdType()) && 1037130561Sobrien Context.ObjCQualifiedIdTypesAreCompatible(ToType, FromType, 103889857Sobrien /*compare=*/false)) { 103989857Sobrien ConvertedType = ToType; 104099461Sobrien return true; 104189857Sobrien } 1042130561Sobrien // Objective C++: We're able to convert from a pointer to an 104389857Sobrien // interface to a pointer to a different interface. 104489857Sobrien if (Context.canAssignObjCInterfaces(ToObjCPtr, FromObjCPtr)) { 1045130561Sobrien ConvertedType = ToType; 104689857Sobrien return true; 104789857Sobrien } 104889857Sobrien 104989857Sobrien if (Context.canAssignObjCInterfaces(FromObjCPtr, ToObjCPtr)) { 105089857Sobrien // Okay: this is some kind of implicit downcast of Objective-C 105189857Sobrien // interfaces, which is permitted. However, we're going to 105289857Sobrien // complain about it. 105389857Sobrien IncompatibleObjC = true; 105489857Sobrien ConvertedType = FromType; 1055130561Sobrien return true; 105689857Sobrien } 105789857Sobrien } 105899461Sobrien // Beyond this point, both types need to be C pointers or block pointers. 105989857Sobrien QualType ToPointeeType; 1060130561Sobrien if (const PointerType *ToCPtr = ToType->getAs<PointerType>()) 106189857Sobrien ToPointeeType = ToCPtr->getPointeeType(); 106289857Sobrien else if (const BlockPointerType *ToBlockPtr = ToType->getAs<BlockPointerType>()) 1063130561Sobrien ToPointeeType = ToBlockPtr->getPointeeType(); 106489857Sobrien else 106589857Sobrien return false; 106689857Sobrien 106789857Sobrien QualType FromPointeeType; 106889857Sobrien if (const PointerType *FromCPtr = FromType->getAs<PointerType>()) 106989857Sobrien FromPointeeType = FromCPtr->getPointeeType(); 1070130561Sobrien else if (const BlockPointerType *FromBlockPtr = FromType->getAs<BlockPointerType>()) 107189857Sobrien FromPointeeType = FromBlockPtr->getPointeeType(); 107289857Sobrien else 107389857Sobrien return false; 107489857Sobrien 1075130561Sobrien // If we have pointers to pointers, recursively check whether this 107689857Sobrien // is an Objective-C conversion. 107789857Sobrien if (FromPointeeType->isPointerType() && ToPointeeType->isPointerType() && 1078130561Sobrien isObjCPointerConversion(FromPointeeType, ToPointeeType, ConvertedType, 107989857Sobrien IncompatibleObjC)) { 108089857Sobrien // We always complain about this conversion. 108189857Sobrien IncompatibleObjC = true; 108289857Sobrien ConvertedType = ToType; 108389857Sobrien return true; 108489857Sobrien } 1085130561Sobrien // If we have pointers to functions or blocks, check whether the only 108689857Sobrien // differences in the argument and result types are in Objective-C 108789857Sobrien // pointer conversions. If so, we permit the conversion (but 108889857Sobrien // complain about it). 108989857Sobrien const FunctionProtoType *FromFunctionType 1090130561Sobrien = FromPointeeType->getAs<FunctionProtoType>(); 109189857Sobrien const FunctionProtoType *ToFunctionType 109289857Sobrien = ToPointeeType->getAs<FunctionProtoType>(); 1093130561Sobrien if (FromFunctionType && ToFunctionType) { 109489857Sobrien // If the function types are exactly the same, this isn't an 109589857Sobrien // Objective-C pointer conversion. 109689857Sobrien if (Context.getCanonicalType(FromPointeeType) 109789857Sobrien == Context.getCanonicalType(ToPointeeType)) 109889857Sobrien return false; 109989857Sobrien 1100130561Sobrien // Perform the quick checks that will tell us whether these 110189857Sobrien // function types are obviously different. 110289857Sobrien if (FromFunctionType->getNumArgs() != ToFunctionType->getNumArgs() || 110399461Sobrien FromFunctionType->isVariadic() != ToFunctionType->isVariadic() || 110489857Sobrien FromFunctionType->getTypeQuals() != ToFunctionType->getTypeQuals()) 1105130561Sobrien return false; 110689857Sobrien 110789857Sobrien bool HasObjCConversion = false; 1108130561Sobrien if (Context.getCanonicalType(FromFunctionType->getResultType()) 110989857Sobrien == Context.getCanonicalType(ToFunctionType->getResultType())) { 111089857Sobrien // Okay, the types match exactly. Nothing to do. 111189857Sobrien } else if (isObjCPointerConversion(FromFunctionType->getResultType(), 111289857Sobrien ToFunctionType->getResultType(), 111389857Sobrien ConvertedType, IncompatibleObjC)) { 111489857Sobrien // Okay, we have an Objective-C pointer conversion. 1115130561Sobrien HasObjCConversion = true; 111689857Sobrien } else { 111789857Sobrien // Function types are too different. Abort. 111899461Sobrien return false; 111989857Sobrien } 1120130561Sobrien 112189857Sobrien // Check argument types. 112289857Sobrien for (unsigned ArgIdx = 0, NumArgs = FromFunctionType->getNumArgs(); 1123130561Sobrien ArgIdx != NumArgs; ++ArgIdx) { 112489857Sobrien QualType FromArgType = FromFunctionType->getArgType(ArgIdx); 112589857Sobrien QualType ToArgType = ToFunctionType->getArgType(ArgIdx); 112689857Sobrien if (Context.getCanonicalType(FromArgType) 112789857Sobrien == Context.getCanonicalType(ToArgType)) { 112889857Sobrien // Okay, the types match exactly. Nothing to do. 112989857Sobrien } else if (isObjCPointerConversion(FromArgType, ToArgType, 1130130561Sobrien ConvertedType, IncompatibleObjC)) { 113189857Sobrien // Okay, we have an Objective-C pointer conversion. 113289857Sobrien HasObjCConversion = true; 113399461Sobrien } else { 113489857Sobrien // Argument types are too different. Abort. 1135130561Sobrien return false; 113689857Sobrien } 113789857Sobrien } 1138130561Sobrien 113989857Sobrien if (HasObjCConversion) { 114089857Sobrien // We had an Objective-C conversion. Allow this pointer 114189857Sobrien // conversion, but complain about it. 114289857Sobrien ConvertedType = ToType; 114399461Sobrien IncompatibleObjC = true; 114499461Sobrien return true; 1145130561Sobrien } 114689857Sobrien } 114789857Sobrien 114899461Sobrien return false; 114989857Sobrien} 1150130561Sobrien 115189857Sobrien/// CheckPointerConversion - Check the pointer conversion from the 115299461Sobrien/// expression From to the type ToType. This routine checks for 1153130561Sobrien/// ambiguous or inaccessible derived-to-base pointer 115489857Sobrien/// conversions for which IsPointerConversion has already returned 115589857Sobrien/// true. It returns true and produces a diagnostic if there was an 115689857Sobrien/// error, or returns false otherwise. 115789857Sobrienbool Sema::CheckPointerConversion(Expr *From, QualType ToType, 115889857Sobrien CastExpr::CastKind &Kind, 115989857Sobrien bool IgnoreBaseAccess) { 1160130561Sobrien QualType FromType = From->getType(); 116189857Sobrien 116289857Sobrien if (const PointerType *FromPtrType = FromType->getAs<PointerType>()) 116399461Sobrien if (const PointerType *ToPtrType = ToType->getAs<PointerType>()) { 116489857Sobrien QualType FromPointeeType = FromPtrType->getPointeeType(), 1165130561Sobrien ToPointeeType = ToPtrType->getPointeeType(); 116689857Sobrien 116789857Sobrien if (FromPointeeType->isRecordType() && 1168130561Sobrien ToPointeeType->isRecordType()) { 116989857Sobrien // We must have a derived-to-base conversion. Check an 117089857Sobrien // ambiguous or inaccessible conversion. 117189857Sobrien if (CheckDerivedToBaseConversion(FromPointeeType, ToPointeeType, 117289857Sobrien From->getExprLoc(), 117389857Sobrien From->getSourceRange(), 117489857Sobrien IgnoreBaseAccess)) 1175130561Sobrien return true; 117689857Sobrien 117789857Sobrien // The conversion was successful. 117899461Sobrien Kind = CastExpr::CK_DerivedToBase; 117989857Sobrien } 1180130561Sobrien } 118189857Sobrien if (const ObjCObjectPointerType *FromPtrType = 118289857Sobrien FromType->getAs<ObjCObjectPointerType>()) 1183130561Sobrien if (const ObjCObjectPointerType *ToPtrType = 118489857Sobrien ToType->getAs<ObjCObjectPointerType>()) { 118589857Sobrien // Objective-C++ conversions are always okay. 118689857Sobrien // FIXME: We should have a different class of conversions for the 118789857Sobrien // Objective-C++ implicit conversions. 118889857Sobrien if (FromPtrType->isObjCBuiltinType() || ToPtrType->isObjCBuiltinType()) 118989857Sobrien return false; 1190130561Sobrien 119189857Sobrien } 119289857Sobrien return false; 119399461Sobrien} 119489857Sobrien 1195130561Sobrien/// IsMemberPointerConversion - Determines whether the conversion of the 119689857Sobrien/// expression From, which has the (possibly adjusted) type FromType, can be 119789857Sobrien/// converted to the type ToType via a member pointer conversion (C++ 4.11). 1198130561Sobrien/// If so, returns true and places the converted type (that might differ from 119989857Sobrien/// ToType in its cv-qualifiers at some level) into ConvertedType. 120089857Sobrienbool Sema::IsMemberPointerConversion(Expr *From, QualType FromType, 120189857Sobrien QualType ToType, 1202218822Sdim bool InOverloadResolution, 120389857Sobrien QualType &ConvertedType) { 120489857Sobrien const MemberPointerType *ToTypePtr = ToType->getAs<MemberPointerType>(); 120589857Sobrien if (!ToTypePtr) 1206130561Sobrien return false; 120789857Sobrien 120889857Sobrien // A null pointer constant can be converted to a member pointer (C++ 4.11p1) 120999461Sobrien if (From->isNullPointerConstant(Context, 121089857Sobrien InOverloadResolution? Expr::NPC_ValueDependentIsNotNull 1211130561Sobrien : Expr::NPC_ValueDependentIsNull)) { 121289857Sobrien ConvertedType = ToType; 121389857Sobrien return true; 1214130561Sobrien } 121589857Sobrien 121689857Sobrien // Otherwise, both types have to be member pointers. 121789857Sobrien const MemberPointerType *FromTypePtr = FromType->getAs<MemberPointerType>(); 121889857Sobrien if (!FromTypePtr) 121989857Sobrien return false; 122089857Sobrien 122189857Sobrien // A pointer to member of B can be converted to a pointer to member of D, 1222130561Sobrien // where D is derived from B (C++ 4.11p2). 122389857Sobrien QualType FromClass(FromTypePtr->getClass(), 0); 122489857Sobrien QualType ToClass(ToTypePtr->getClass(), 0); 122599461Sobrien // FIXME: What happens when these are dependent? Is this function even called? 122689857Sobrien 1227130561Sobrien if (IsDerivedFrom(ToClass, FromClass)) { 122889857Sobrien ConvertedType = Context.getMemberPointerType(FromTypePtr->getPointeeType(), 122989857Sobrien ToClass.getTypePtr()); 1230130561Sobrien return true; 123189857Sobrien } 1232130561Sobrien 1233130561Sobrien return false; 1234130561Sobrien} 1235130561Sobrien 1236130561Sobrien/// CheckMemberPointerConversion - Check the member pointer conversion from the 1237130561Sobrien/// expression From to the type ToType. This routine checks for ambiguous or 1238130561Sobrien/// virtual (FIXME: or inaccessible) base-to-derived member pointer conversions 1239130561Sobrien/// for which IsMemberPointerConversion has already returned true. It returns 1240130561Sobrien/// true and produces a diagnostic if there was an error, or returns false 1241130561Sobrien/// otherwise. 1242130561Sobrienbool Sema::CheckMemberPointerConversion(Expr *From, QualType ToType, 1243130561Sobrien CastExpr::CastKind &Kind, 1244130561Sobrien bool IgnoreBaseAccess) { 1245130561Sobrien (void)IgnoreBaseAccess; 1246130561Sobrien QualType FromType = From->getType(); 1247130561Sobrien const MemberPointerType *FromPtrType = FromType->getAs<MemberPointerType>(); 1248130561Sobrien if (!FromPtrType) { 1249130561Sobrien // This must be a null pointer to member pointer conversion 1250130561Sobrien assert(From->isNullPointerConstant(Context, 1251130561Sobrien Expr::NPC_ValueDependentIsNull) && 1252130561Sobrien "Expr must be null pointer constant!"); 1253130561Sobrien Kind = CastExpr::CK_NullToMemberPointer; 1254130561Sobrien return false; 1255130561Sobrien } 1256130561Sobrien 1257130561Sobrien const MemberPointerType *ToPtrType = ToType->getAs<MemberPointerType>(); 1258130561Sobrien assert(ToPtrType && "No member pointer cast has a target type " 1259130561Sobrien "that is not a member pointer."); 1260130561Sobrien 1261130561Sobrien QualType FromClass = QualType(FromPtrType->getClass(), 0); 1262130561Sobrien QualType ToClass = QualType(ToPtrType->getClass(), 0); 1263130561Sobrien 1264130561Sobrien // FIXME: What about dependent types? 1265130561Sobrien assert(FromClass->isRecordType() && "Pointer into non-class."); 1266130561Sobrien assert(ToClass->isRecordType() && "Pointer into non-class."); 1267130561Sobrien 1268130561Sobrien CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/false, 1269130561Sobrien /*DetectVirtual=*/true); 1270130561Sobrien bool DerivationOkay = IsDerivedFrom(ToClass, FromClass, Paths); 1271130561Sobrien assert(DerivationOkay && 1272130561Sobrien "Should not have been called if derivation isn't OK."); 1273130561Sobrien (void)DerivationOkay; 1274130561Sobrien 1275130561Sobrien if (Paths.isAmbiguous(Context.getCanonicalType(FromClass). 1276130561Sobrien getUnqualifiedType())) { 1277130561Sobrien // Derivation is ambiguous. Redo the check to find the exact paths. 1278130561Sobrien Paths.clear(); 1279130561Sobrien Paths.setRecordingPaths(true); 1280130561Sobrien bool StillOkay = IsDerivedFrom(ToClass, FromClass, Paths); 1281130561Sobrien assert(StillOkay && "Derivation changed due to quantum fluctuation."); 1282130561Sobrien (void)StillOkay; 1283130561Sobrien 1284130561Sobrien std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1285130561Sobrien Diag(From->getExprLoc(), diag::err_ambiguous_memptr_conv) 1286130561Sobrien << 0 << FromClass << ToClass << PathDisplayStr << From->getSourceRange(); 1287130561Sobrien return true; 1288130561Sobrien } 1289130561Sobrien 1290130561Sobrien if (const RecordType *VBase = Paths.getDetectedVirtual()) { 1291130561Sobrien Diag(From->getExprLoc(), diag::err_memptr_conv_via_virtual) 1292130561Sobrien << FromClass << ToClass << QualType(VBase, 0) 1293130561Sobrien << From->getSourceRange(); 1294130561Sobrien return true; 1295130561Sobrien } 1296130561Sobrien 1297130561Sobrien // Must be a base to derived member conversion. 1298130561Sobrien Kind = CastExpr::CK_BaseToDerivedMemberPointer; 1299130561Sobrien return false; 1300130561Sobrien} 1301130561Sobrien 1302130561Sobrien/// IsQualificationConversion - Determines whether the conversion from 1303130561Sobrien/// an rvalue of type FromType to ToType is a qualification conversion 1304130561Sobrien/// (C++ 4.4). 1305130561Sobrienbool 1306130561SobrienSema::IsQualificationConversion(QualType FromType, QualType ToType) { 1307130561Sobrien FromType = Context.getCanonicalType(FromType); 1308130561Sobrien ToType = Context.getCanonicalType(ToType); 1309130561Sobrien 1310130561Sobrien // If FromType and ToType are the same type, this is not a 1311130561Sobrien // qualification conversion. 1312130561Sobrien if (FromType == ToType) 1313130561Sobrien return false; 1314130561Sobrien 1315130561Sobrien // (C++ 4.4p4): 1316130561Sobrien // A conversion can add cv-qualifiers at levels other than the first 1317130561Sobrien // in multi-level pointers, subject to the following rules: [...] 1318130561Sobrien bool PreviousToQualsIncludeConst = true; 1319130561Sobrien bool UnwrappedAnyPointer = false; 1320130561Sobrien while (UnwrapSimilarPointerTypes(FromType, ToType)) { 1321130561Sobrien // Within each iteration of the loop, we check the qualifiers to 1322130561Sobrien // determine if this still looks like a qualification 1323130561Sobrien // conversion. Then, if all is well, we unwrap one more level of 1324130561Sobrien // pointers or pointers-to-members and do it all again 1325130561Sobrien // until there are no more pointers or pointers-to-members left to 1326130561Sobrien // unwrap. 1327130561Sobrien UnwrappedAnyPointer = true; 1328130561Sobrien 1329130561Sobrien // -- for every j > 0, if const is in cv 1,j then const is in cv 1330130561Sobrien // 2,j, and similarly for volatile. 1331130561Sobrien if (!ToType.isAtLeastAsQualifiedAs(FromType)) 1332130561Sobrien return false; 1333130561Sobrien 1334130561Sobrien // -- if the cv 1,j and cv 2,j are different, then const is in 1335130561Sobrien // every cv for 0 < k < j. 1336130561Sobrien if (FromType.getCVRQualifiers() != ToType.getCVRQualifiers() 1337130561Sobrien && !PreviousToQualsIncludeConst) 1338130561Sobrien return false; 1339130561Sobrien 1340130561Sobrien // Keep track of whether all prior cv-qualifiers in the "to" type 1341130561Sobrien // include const. 1342130561Sobrien PreviousToQualsIncludeConst 1343130561Sobrien = PreviousToQualsIncludeConst && ToType.isConstQualified(); 1344130561Sobrien } 1345130561Sobrien 1346130561Sobrien // We are left with FromType and ToType being the pointee types 1347130561Sobrien // after unwrapping the original FromType and ToType the same number 1348130561Sobrien // of types. If we unwrapped any pointers, and if FromType and 1349130561Sobrien // ToType have the same unqualified type (since we checked 1350130561Sobrien // qualifiers above), then this is a qualification conversion. 1351130561Sobrien return UnwrappedAnyPointer && Context.hasSameUnqualifiedType(FromType,ToType); 1352130561Sobrien} 1353130561Sobrien 1354130561Sobrien/// \brief Given a function template or function, extract the function template 1355130561Sobrien/// declaration (if any) and the underlying function declaration. 1356130561Sobrientemplate<typename T> 1357130561Sobrienstatic void GetFunctionAndTemplate(AnyFunctionDecl Orig, T *&Function, 1358130561Sobrien FunctionTemplateDecl *&FunctionTemplate) { 1359130561Sobrien FunctionTemplate = dyn_cast<FunctionTemplateDecl>(Orig); 1360130561Sobrien if (FunctionTemplate) 1361130561Sobrien Function = cast<T>(FunctionTemplate->getTemplatedDecl()); 1362130561Sobrien else 1363130561Sobrien Function = cast<T>(Orig); 1364130561Sobrien} 1365130561Sobrien 1366130561Sobrien/// Determines whether there is a user-defined conversion sequence 1367130561Sobrien/// (C++ [over.ics.user]) that converts expression From to the type 1368130561Sobrien/// ToType. If such a conversion exists, User will contain the 1369130561Sobrien/// user-defined conversion sequence that performs such a conversion 1370130561Sobrien/// and this routine will return true. Otherwise, this routine returns 1371130561Sobrien/// false and User is unspecified. 1372130561Sobrien/// 1373130561Sobrien/// \param AllowConversionFunctions true if the conversion should 1374130561Sobrien/// consider conversion functions at all. If false, only constructors 1375130561Sobrien/// will be considered. 1376130561Sobrien/// 1377130561Sobrien/// \param AllowExplicit true if the conversion should consider C++0x 1378130561Sobrien/// "explicit" conversion functions as well as non-explicit conversion 1379130561Sobrien/// functions (C++0x [class.conv.fct]p2). 1380130561Sobrien/// 1381130561Sobrien/// \param ForceRValue true if the expression should be treated as an rvalue 1382130561Sobrien/// for overload resolution. 1383130561Sobrien/// \param UserCast true if looking for user defined conversion for a static 1384130561Sobrien/// cast. 1385130561SobrienSema::OverloadingResult Sema::IsUserDefinedConversion( 1386130561Sobrien Expr *From, QualType ToType, 1387130561Sobrien UserDefinedConversionSequence& User, 1388130561Sobrien OverloadCandidateSet& CandidateSet, 1389130561Sobrien bool AllowConversionFunctions, 1390130561Sobrien bool AllowExplicit, bool ForceRValue, 1391130561Sobrien bool UserCast) { 1392130561Sobrien if (const RecordType *ToRecordType = ToType->getAs<RecordType>()) { 1393130561Sobrien if (RequireCompleteType(From->getLocStart(), ToType, PDiag())) { 1394130561Sobrien // We're not going to find any constructors. 1395130561Sobrien } else if (CXXRecordDecl *ToRecordDecl 1396130561Sobrien = dyn_cast<CXXRecordDecl>(ToRecordType->getDecl())) { 1397130561Sobrien // C++ [over.match.ctor]p1: 1398130561Sobrien // When objects of class type are direct-initialized (8.5), or 1399130561Sobrien // copy-initialized from an expression of the same or a 1400130561Sobrien // derived class type (8.5), overload resolution selects the 1401130561Sobrien // constructor. [...] For copy-initialization, the candidate 1402130561Sobrien // functions are all the converting constructors (12.3.1) of 1403130561Sobrien // that class. The argument list is the expression-list within 1404130561Sobrien // the parentheses of the initializer. 1405130561Sobrien bool SuppressUserConversions = !UserCast; 1406130561Sobrien if (Context.hasSameUnqualifiedType(ToType, From->getType()) || 1407130561Sobrien IsDerivedFrom(From->getType(), ToType)) { 1408130561Sobrien SuppressUserConversions = false; 1409130561Sobrien AllowConversionFunctions = false; 1410130561Sobrien } 1411130561Sobrien 1412130561Sobrien DeclarationName ConstructorName 1413130561Sobrien = Context.DeclarationNames.getCXXConstructorName( 1414130561Sobrien Context.getCanonicalType(ToType).getUnqualifiedType()); 1415130561Sobrien DeclContext::lookup_iterator Con, ConEnd; 1416130561Sobrien for (llvm::tie(Con, ConEnd) 1417130561Sobrien = ToRecordDecl->lookup(ConstructorName); 1418130561Sobrien Con != ConEnd; ++Con) { 1419130561Sobrien // Find the constructor (which may be a template). 1420130561Sobrien CXXConstructorDecl *Constructor = 0; 1421130561Sobrien FunctionTemplateDecl *ConstructorTmpl 1422130561Sobrien = dyn_cast<FunctionTemplateDecl>(*Con); 1423130561Sobrien if (ConstructorTmpl) 1424130561Sobrien Constructor 1425130561Sobrien = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 1426130561Sobrien else 1427130561Sobrien Constructor = cast<CXXConstructorDecl>(*Con); 1428130561Sobrien 1429130561Sobrien if (!Constructor->isInvalidDecl() && 1430130561Sobrien Constructor->isConvertingConstructor(AllowExplicit)) { 1431130561Sobrien if (ConstructorTmpl) 1432130561Sobrien AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, &From, 1433130561Sobrien 1, CandidateSet, 1434130561Sobrien SuppressUserConversions, ForceRValue); 1435130561Sobrien else 1436130561Sobrien // Allow one user-defined conversion when user specifies a 1437130561Sobrien // From->ToType conversion via an static cast (c-style, etc). 1438130561Sobrien AddOverloadCandidate(Constructor, &From, 1, CandidateSet, 1439130561Sobrien SuppressUserConversions, ForceRValue); 1440130561Sobrien } 1441130561Sobrien } 1442130561Sobrien } 1443130561Sobrien } 1444130561Sobrien 1445130561Sobrien if (!AllowConversionFunctions) { 1446130561Sobrien // Don't allow any conversion functions to enter the overload set. 1447130561Sobrien } else if (RequireCompleteType(From->getLocStart(), From->getType(), 1448130561Sobrien PDiag(0) 1449130561Sobrien << From->getSourceRange())) { 1450130561Sobrien // No conversion functions from incomplete types. 1451130561Sobrien } else if (const RecordType *FromRecordType 1452130561Sobrien = From->getType()->getAs<RecordType>()) { 1453130561Sobrien if (CXXRecordDecl *FromRecordDecl 1454130561Sobrien = dyn_cast<CXXRecordDecl>(FromRecordType->getDecl())) { 1455130561Sobrien // Add all of the conversion functions as candidates. 1456130561Sobrien OverloadedFunctionDecl *Conversions 1457130561Sobrien = FromRecordDecl->getVisibleConversionFunctions(); 1458130561Sobrien for (OverloadedFunctionDecl::function_iterator Func 1459130561Sobrien = Conversions->function_begin(); 1460130561Sobrien Func != Conversions->function_end(); ++Func) { 1461130561Sobrien CXXConversionDecl *Conv; 1462130561Sobrien FunctionTemplateDecl *ConvTemplate; 1463130561Sobrien GetFunctionAndTemplate(*Func, Conv, ConvTemplate); 1464130561Sobrien if (ConvTemplate) 1465130561Sobrien Conv = dyn_cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 1466130561Sobrien else 1467130561Sobrien Conv = dyn_cast<CXXConversionDecl>(*Func); 1468130561Sobrien 1469130561Sobrien if (AllowExplicit || !Conv->isExplicit()) { 1470130561Sobrien if (ConvTemplate) 1471130561Sobrien AddTemplateConversionCandidate(ConvTemplate, From, ToType, 1472130561Sobrien CandidateSet); 1473130561Sobrien else 1474130561Sobrien AddConversionCandidate(Conv, From, ToType, CandidateSet); 1475130561Sobrien } 1476130561Sobrien } 1477130561Sobrien } 1478130561Sobrien } 1479130561Sobrien 1480130561Sobrien OverloadCandidateSet::iterator Best; 1481130561Sobrien switch (BestViableFunction(CandidateSet, From->getLocStart(), Best)) { 1482130561Sobrien case OR_Success: 1483130561Sobrien // Record the standard conversion we used and the conversion function. 1484130561Sobrien if (CXXConstructorDecl *Constructor 1485130561Sobrien = dyn_cast<CXXConstructorDecl>(Best->Function)) { 1486130561Sobrien // C++ [over.ics.user]p1: 1487130561Sobrien // If the user-defined conversion is specified by a 1488130561Sobrien // constructor (12.3.1), the initial standard conversion 1489130561Sobrien // sequence converts the source type to the type required by 1490130561Sobrien // the argument of the constructor. 1491130561Sobrien // 1492130561Sobrien QualType ThisType = Constructor->getThisType(Context); 1493130561Sobrien if (Best->Conversions[0].ConversionKind == 1494130561Sobrien ImplicitConversionSequence::EllipsisConversion) 1495130561Sobrien User.EllipsisConversion = true; 1496130561Sobrien else { 1497130561Sobrien User.Before = Best->Conversions[0].Standard; 1498130561Sobrien User.EllipsisConversion = false; 1499130561Sobrien } 1500130561Sobrien User.ConversionFunction = Constructor; 1501130561Sobrien User.After.setAsIdentityConversion(); 1502130561Sobrien User.After.FromTypePtr 1503130561Sobrien = ThisType->getAs<PointerType>()->getPointeeType().getAsOpaquePtr(); 1504130561Sobrien User.After.ToTypePtr = ToType.getAsOpaquePtr(); 1505130561Sobrien return OR_Success; 1506130561Sobrien } else if (CXXConversionDecl *Conversion 1507130561Sobrien = dyn_cast<CXXConversionDecl>(Best->Function)) { 1508130561Sobrien // C++ [over.ics.user]p1: 1509130561Sobrien // 1510130561Sobrien // [...] If the user-defined conversion is specified by a 1511130561Sobrien // conversion function (12.3.2), the initial standard 1512130561Sobrien // conversion sequence converts the source type to the 1513130561Sobrien // implicit object parameter of the conversion function. 1514130561Sobrien User.Before = Best->Conversions[0].Standard; 1515130561Sobrien User.ConversionFunction = Conversion; 1516130561Sobrien User.EllipsisConversion = false; 1517130561Sobrien 1518130561Sobrien // C++ [over.ics.user]p2: 1519130561Sobrien // The second standard conversion sequence converts the 1520130561Sobrien // result of the user-defined conversion to the target type 1521130561Sobrien // for the sequence. Since an implicit conversion sequence 1522130561Sobrien // is an initialization, the special rules for 1523130561Sobrien // initialization by user-defined conversion apply when 1524130561Sobrien // selecting the best user-defined conversion for a 1525130561Sobrien // user-defined conversion sequence (see 13.3.3 and 1526130561Sobrien // 13.3.3.1). 1527130561Sobrien User.After = Best->FinalConversion; 1528130561Sobrien return OR_Success; 1529130561Sobrien } else { 1530130561Sobrien assert(false && "Not a constructor or conversion function?"); 1531130561Sobrien return OR_No_Viable_Function; 1532130561Sobrien } 1533130561Sobrien 1534130561Sobrien case OR_No_Viable_Function: 1535130561Sobrien return OR_No_Viable_Function; 1536130561Sobrien case OR_Deleted: 1537130561Sobrien // No conversion here! We're done. 1538130561Sobrien return OR_Deleted; 1539130561Sobrien 1540130561Sobrien case OR_Ambiguous: 1541130561Sobrien return OR_Ambiguous; 1542130561Sobrien } 1543130561Sobrien 1544130561Sobrien return OR_No_Viable_Function; 1545130561Sobrien} 1546130561Sobrien 1547130561Sobrienbool 1548130561SobrienSema::DiagnoseAmbiguousUserDefinedConversion(Expr *From, QualType ToType) { 1549130561Sobrien ImplicitConversionSequence ICS; 1550130561Sobrien OverloadCandidateSet CandidateSet; 1551130561Sobrien OverloadingResult OvResult = 1552130561Sobrien IsUserDefinedConversion(From, ToType, ICS.UserDefined, 1553130561Sobrien CandidateSet, true, false, false); 1554130561Sobrien if (OvResult != OR_Ambiguous) 1555130561Sobrien return false; 1556130561Sobrien Diag(From->getSourceRange().getBegin(), 1557130561Sobrien diag::err_typecheck_ambiguous_condition) 1558130561Sobrien << From->getType() << ToType << From->getSourceRange(); 1559130561Sobrien PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1560130561Sobrien return true; 1561130561Sobrien} 1562130561Sobrien 1563130561Sobrien/// CompareImplicitConversionSequences - Compare two implicit 1564130561Sobrien/// conversion sequences to determine whether one is better than the 1565130561Sobrien/// other or if they are indistinguishable (C++ 13.3.3.2). 1566130561SobrienImplicitConversionSequence::CompareKind 1567130561SobrienSema::CompareImplicitConversionSequences(const ImplicitConversionSequence& ICS1, 1568130561Sobrien const ImplicitConversionSequence& ICS2) 1569130561Sobrien{ 1570130561Sobrien // (C++ 13.3.3.2p2): When comparing the basic forms of implicit 1571130561Sobrien // conversion sequences (as defined in 13.3.3.1) 1572130561Sobrien // -- a standard conversion sequence (13.3.3.1.1) is a better 1573130561Sobrien // conversion sequence than a user-defined conversion sequence or 1574130561Sobrien // an ellipsis conversion sequence, and 1575130561Sobrien // -- a user-defined conversion sequence (13.3.3.1.2) is a better 1576130561Sobrien // conversion sequence than an ellipsis conversion sequence 1577130561Sobrien // (13.3.3.1.3). 1578130561Sobrien // 1579130561Sobrien if (ICS1.ConversionKind < ICS2.ConversionKind) 1580130561Sobrien return ImplicitConversionSequence::Better; 1581130561Sobrien else if (ICS2.ConversionKind < ICS1.ConversionKind) 1582130561Sobrien return ImplicitConversionSequence::Worse; 1583130561Sobrien 1584130561Sobrien // Two implicit conversion sequences of the same form are 1585130561Sobrien // indistinguishable conversion sequences unless one of the 1586130561Sobrien // following rules apply: (C++ 13.3.3.2p3): 1587130561Sobrien if (ICS1.ConversionKind == ImplicitConversionSequence::StandardConversion) 1588130561Sobrien return CompareStandardConversionSequences(ICS1.Standard, ICS2.Standard); 1589130561Sobrien else if (ICS1.ConversionKind == 1590130561Sobrien ImplicitConversionSequence::UserDefinedConversion) { 1591130561Sobrien // User-defined conversion sequence U1 is a better conversion 1592130561Sobrien // sequence than another user-defined conversion sequence U2 if 1593130561Sobrien // they contain the same user-defined conversion function or 1594130561Sobrien // constructor and if the second standard conversion sequence of 1595130561Sobrien // U1 is better than the second standard conversion sequence of 1596130561Sobrien // U2 (C++ 13.3.3.2p3). 1597130561Sobrien if (ICS1.UserDefined.ConversionFunction == 1598130561Sobrien ICS2.UserDefined.ConversionFunction) 1599130561Sobrien return CompareStandardConversionSequences(ICS1.UserDefined.After, 1600130561Sobrien ICS2.UserDefined.After); 1601130561Sobrien } 1602130561Sobrien 1603130561Sobrien return ImplicitConversionSequence::Indistinguishable; 1604130561Sobrien} 1605130561Sobrien 1606130561Sobrien/// CompareStandardConversionSequences - Compare two standard 1607130561Sobrien/// conversion sequences to determine whether one is better than the 1608130561Sobrien/// other or if they are indistinguishable (C++ 13.3.3.2p3). 1609130561SobrienImplicitConversionSequence::CompareKind 1610130561SobrienSema::CompareStandardConversionSequences(const StandardConversionSequence& SCS1, 1611130561Sobrien const StandardConversionSequence& SCS2) 1612130561Sobrien{ 1613130561Sobrien // Standard conversion sequence S1 is a better conversion sequence 1614130561Sobrien // than standard conversion sequence S2 if (C++ 13.3.3.2p3): 1615130561Sobrien 1616130561Sobrien // -- S1 is a proper subsequence of S2 (comparing the conversion 1617130561Sobrien // sequences in the canonical form defined by 13.3.3.1.1, 1618130561Sobrien // excluding any Lvalue Transformation; the identity conversion 1619130561Sobrien // sequence is considered to be a subsequence of any 1620130561Sobrien // non-identity conversion sequence) or, if not that, 1621130561Sobrien if (SCS1.Second == SCS2.Second && SCS1.Third == SCS2.Third) 1622130561Sobrien // Neither is a proper subsequence of the other. Do nothing. 1623130561Sobrien ; 1624130561Sobrien else if ((SCS1.Second == ICK_Identity && SCS1.Third == SCS2.Third) || 1625130561Sobrien (SCS1.Third == ICK_Identity && SCS1.Second == SCS2.Second) || 1626130561Sobrien (SCS1.Second == ICK_Identity && 1627130561Sobrien SCS1.Third == ICK_Identity)) 1628130561Sobrien // SCS1 is a proper subsequence of SCS2. 1629130561Sobrien return ImplicitConversionSequence::Better; 1630130561Sobrien else if ((SCS2.Second == ICK_Identity && SCS2.Third == SCS1.Third) || 1631130561Sobrien (SCS2.Third == ICK_Identity && SCS2.Second == SCS1.Second) || 1632130561Sobrien (SCS2.Second == ICK_Identity && 1633130561Sobrien SCS2.Third == ICK_Identity)) 1634130561Sobrien // SCS2 is a proper subsequence of SCS1. 1635130561Sobrien return ImplicitConversionSequence::Worse; 1636130561Sobrien 1637130561Sobrien // -- the rank of S1 is better than the rank of S2 (by the rules 1638130561Sobrien // defined below), or, if not that, 1639130561Sobrien ImplicitConversionRank Rank1 = SCS1.getRank(); 1640130561Sobrien ImplicitConversionRank Rank2 = SCS2.getRank(); 1641130561Sobrien if (Rank1 < Rank2) 1642130561Sobrien return ImplicitConversionSequence::Better; 1643130561Sobrien else if (Rank2 < Rank1) 1644130561Sobrien return ImplicitConversionSequence::Worse; 1645130561Sobrien 1646130561Sobrien // (C++ 13.3.3.2p4): Two conversion sequences with the same rank 1647130561Sobrien // are indistinguishable unless one of the following rules 1648130561Sobrien // applies: 1649130561Sobrien 1650130561Sobrien // A conversion that is not a conversion of a pointer, or 1651130561Sobrien // pointer to member, to bool is better than another conversion 1652130561Sobrien // that is such a conversion. 1653130561Sobrien if (SCS1.isPointerConversionToBool() != SCS2.isPointerConversionToBool()) 1654130561Sobrien return SCS2.isPointerConversionToBool() 1655130561Sobrien ? ImplicitConversionSequence::Better 1656130561Sobrien : ImplicitConversionSequence::Worse; 1657130561Sobrien 1658130561Sobrien // C++ [over.ics.rank]p4b2: 1659130561Sobrien // 1660130561Sobrien // If class B is derived directly or indirectly from class A, 1661130561Sobrien // conversion of B* to A* is better than conversion of B* to 1662130561Sobrien // void*, and conversion of A* to void* is better than conversion 1663130561Sobrien // of B* to void*. 1664130561Sobrien bool SCS1ConvertsToVoid 1665130561Sobrien = SCS1.isPointerConversionToVoidPointer(Context); 1666130561Sobrien bool SCS2ConvertsToVoid 1667130561Sobrien = SCS2.isPointerConversionToVoidPointer(Context); 1668130561Sobrien if (SCS1ConvertsToVoid != SCS2ConvertsToVoid) { 1669130561Sobrien // Exactly one of the conversion sequences is a conversion to 1670130561Sobrien // a void pointer; it's the worse conversion. 1671130561Sobrien return SCS2ConvertsToVoid ? ImplicitConversionSequence::Better 1672130561Sobrien : ImplicitConversionSequence::Worse; 1673130561Sobrien } else if (!SCS1ConvertsToVoid && !SCS2ConvertsToVoid) { 1674130561Sobrien // Neither conversion sequence converts to a void pointer; compare 1675130561Sobrien // their derived-to-base conversions. 1676130561Sobrien if (ImplicitConversionSequence::CompareKind DerivedCK 1677130561Sobrien = CompareDerivedToBaseConversions(SCS1, SCS2)) 1678130561Sobrien return DerivedCK; 1679130561Sobrien } else if (SCS1ConvertsToVoid && SCS2ConvertsToVoid) { 1680130561Sobrien // Both conversion sequences are conversions to void 1681130561Sobrien // pointers. Compare the source types to determine if there's an 1682130561Sobrien // inheritance relationship in their sources. 1683130561Sobrien QualType FromType1 = QualType::getFromOpaquePtr(SCS1.FromTypePtr); 1684130561Sobrien QualType FromType2 = QualType::getFromOpaquePtr(SCS2.FromTypePtr); 1685130561Sobrien 1686130561Sobrien // Adjust the types we're converting from via the array-to-pointer 1687130561Sobrien // conversion, if we need to. 1688130561Sobrien if (SCS1.First == ICK_Array_To_Pointer) 1689130561Sobrien FromType1 = Context.getArrayDecayedType(FromType1); 1690130561Sobrien if (SCS2.First == ICK_Array_To_Pointer) 1691130561Sobrien FromType2 = Context.getArrayDecayedType(FromType2); 1692130561Sobrien 1693130561Sobrien QualType FromPointee1 1694130561Sobrien = FromType1->getAs<PointerType>()->getPointeeType().getUnqualifiedType(); 1695130561Sobrien QualType FromPointee2 1696130561Sobrien = FromType2->getAs<PointerType>()->getPointeeType().getUnqualifiedType(); 1697130561Sobrien 1698130561Sobrien if (IsDerivedFrom(FromPointee2, FromPointee1)) 1699130561Sobrien return ImplicitConversionSequence::Better; 1700130561Sobrien else if (IsDerivedFrom(FromPointee1, FromPointee2)) 1701130561Sobrien return ImplicitConversionSequence::Worse; 1702130561Sobrien 1703130561Sobrien // Objective-C++: If one interface is more specific than the 1704130561Sobrien // other, it is the better one. 1705130561Sobrien const ObjCInterfaceType* FromIface1 = FromPointee1->getAs<ObjCInterfaceType>(); 1706130561Sobrien const ObjCInterfaceType* FromIface2 = FromPointee2->getAs<ObjCInterfaceType>(); 1707130561Sobrien if (FromIface1 && FromIface1) { 1708130561Sobrien if (Context.canAssignObjCInterfaces(FromIface2, FromIface1)) 1709130561Sobrien return ImplicitConversionSequence::Better; 1710130561Sobrien else if (Context.canAssignObjCInterfaces(FromIface1, FromIface2)) 1711130561Sobrien return ImplicitConversionSequence::Worse; 1712130561Sobrien } 1713130561Sobrien } 1714130561Sobrien 1715130561Sobrien // Compare based on qualification conversions (C++ 13.3.3.2p3, 1716130561Sobrien // bullet 3). 1717130561Sobrien if (ImplicitConversionSequence::CompareKind QualCK 1718130561Sobrien = CompareQualificationConversions(SCS1, SCS2)) 1719130561Sobrien return QualCK; 1720130561Sobrien 1721130561Sobrien if (SCS1.ReferenceBinding && SCS2.ReferenceBinding) { 1722130561Sobrien // C++0x [over.ics.rank]p3b4: 1723130561Sobrien // -- S1 and S2 are reference bindings (8.5.3) and neither refers to an 1724130561Sobrien // implicit object parameter of a non-static member function declared 1725130561Sobrien // without a ref-qualifier, and S1 binds an rvalue reference to an 1726130561Sobrien // rvalue and S2 binds an lvalue reference. 1727130561Sobrien // FIXME: We don't know if we're dealing with the implicit object parameter, 1728130561Sobrien // or if the member function in this case has a ref qualifier. 1729130561Sobrien // (Of course, we don't have ref qualifiers yet.) 1730130561Sobrien if (SCS1.RRefBinding != SCS2.RRefBinding) 1731130561Sobrien return SCS1.RRefBinding ? ImplicitConversionSequence::Better 1732130561Sobrien : ImplicitConversionSequence::Worse; 1733130561Sobrien 1734130561Sobrien // C++ [over.ics.rank]p3b4: 1735130561Sobrien // -- S1 and S2 are reference bindings (8.5.3), and the types to 1736130561Sobrien // which the references refer are the same type except for 1737130561Sobrien // top-level cv-qualifiers, and the type to which the reference 1738130561Sobrien // initialized by S2 refers is more cv-qualified than the type 1739130561Sobrien // to which the reference initialized by S1 refers. 1740130561Sobrien QualType T1 = QualType::getFromOpaquePtr(SCS1.ToTypePtr); 1741130561Sobrien QualType T2 = QualType::getFromOpaquePtr(SCS2.ToTypePtr); 1742130561Sobrien T1 = Context.getCanonicalType(T1); 1743130561Sobrien T2 = Context.getCanonicalType(T2); 1744130561Sobrien if (Context.hasSameUnqualifiedType(T1, T2)) { 1745130561Sobrien if (T2.isMoreQualifiedThan(T1)) 1746130561Sobrien return ImplicitConversionSequence::Better; 1747130561Sobrien else if (T1.isMoreQualifiedThan(T2)) 1748130561Sobrien return ImplicitConversionSequence::Worse; 1749130561Sobrien } 1750130561Sobrien } 1751130561Sobrien 1752130561Sobrien return ImplicitConversionSequence::Indistinguishable; 1753130561Sobrien} 1754130561Sobrien 1755130561Sobrien/// CompareQualificationConversions - Compares two standard conversion 1756130561Sobrien/// sequences to determine whether they can be ranked based on their 1757130561Sobrien/// qualification conversions (C++ 13.3.3.2p3 bullet 3). 1758130561SobrienImplicitConversionSequence::CompareKind 1759130561SobrienSema::CompareQualificationConversions(const StandardConversionSequence& SCS1, 1760130561Sobrien const StandardConversionSequence& SCS2) { 1761130561Sobrien // C++ 13.3.3.2p3: 1762130561Sobrien // -- S1 and S2 differ only in their qualification conversion and 1763130561Sobrien // yield similar types T1 and T2 (C++ 4.4), respectively, and the 1764130561Sobrien // cv-qualification signature of type T1 is a proper subset of 1765130561Sobrien // the cv-qualification signature of type T2, and S1 is not the 1766130561Sobrien // deprecated string literal array-to-pointer conversion (4.2). 1767130561Sobrien if (SCS1.First != SCS2.First || SCS1.Second != SCS2.Second || 1768130561Sobrien SCS1.Third != SCS2.Third || SCS1.Third != ICK_Qualification) 1769130561Sobrien return ImplicitConversionSequence::Indistinguishable; 1770130561Sobrien 1771130561Sobrien // FIXME: the example in the standard doesn't use a qualification 1772130561Sobrien // conversion (!) 1773130561Sobrien QualType T1 = QualType::getFromOpaquePtr(SCS1.ToTypePtr); 1774130561Sobrien QualType T2 = QualType::getFromOpaquePtr(SCS2.ToTypePtr); 1775130561Sobrien T1 = Context.getCanonicalType(T1); 1776130561Sobrien T2 = Context.getCanonicalType(T2); 1777130561Sobrien 1778130561Sobrien // If the types are the same, we won't learn anything by unwrapped 1779130561Sobrien // them. 1780130561Sobrien if (Context.hasSameUnqualifiedType(T1, T2)) 1781130561Sobrien return ImplicitConversionSequence::Indistinguishable; 1782130561Sobrien 1783130561Sobrien ImplicitConversionSequence::CompareKind Result 1784130561Sobrien = ImplicitConversionSequence::Indistinguishable; 1785130561Sobrien while (UnwrapSimilarPointerTypes(T1, T2)) { 1786130561Sobrien // Within each iteration of the loop, we check the qualifiers to 1787130561Sobrien // determine if this still looks like a qualification 1788130561Sobrien // conversion. Then, if all is well, we unwrap one more level of 1789130561Sobrien // pointers or pointers-to-members and do it all again 1790130561Sobrien // until there are no more pointers or pointers-to-members left 1791130561Sobrien // to unwrap. This essentially mimics what 1792130561Sobrien // IsQualificationConversion does, but here we're checking for a 1793130561Sobrien // strict subset of qualifiers. 1794130561Sobrien if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 1795130561Sobrien // The qualifiers are the same, so this doesn't tell us anything 1796130561Sobrien // about how the sequences rank. 1797130561Sobrien ; 1798130561Sobrien else if (T2.isMoreQualifiedThan(T1)) { 1799130561Sobrien // T1 has fewer qualifiers, so it could be the better sequence. 1800130561Sobrien if (Result == ImplicitConversionSequence::Worse) 1801130561Sobrien // Neither has qualifiers that are a subset of the other's 1802130561Sobrien // qualifiers. 1803130561Sobrien return ImplicitConversionSequence::Indistinguishable; 1804130561Sobrien 1805130561Sobrien Result = ImplicitConversionSequence::Better; 1806130561Sobrien } else if (T1.isMoreQualifiedThan(T2)) { 1807130561Sobrien // T2 has fewer qualifiers, so it could be the better sequence. 1808130561Sobrien if (Result == ImplicitConversionSequence::Better) 1809130561Sobrien // Neither has qualifiers that are a subset of the other's 1810130561Sobrien // qualifiers. 1811130561Sobrien return ImplicitConversionSequence::Indistinguishable; 1812130561Sobrien 1813130561Sobrien Result = ImplicitConversionSequence::Worse; 1814130561Sobrien } else { 1815130561Sobrien // Qualifiers are disjoint. 1816130561Sobrien return ImplicitConversionSequence::Indistinguishable; 1817130561Sobrien } 1818130561Sobrien 1819130561Sobrien // If the types after this point are equivalent, we're done. 1820130561Sobrien if (Context.hasSameUnqualifiedType(T1, T2)) 1821130561Sobrien break; 1822130561Sobrien } 1823130561Sobrien 1824130561Sobrien // Check that the winning standard conversion sequence isn't using 1825130561Sobrien // the deprecated string literal array to pointer conversion. 1826130561Sobrien switch (Result) { 1827130561Sobrien case ImplicitConversionSequence::Better: 1828130561Sobrien if (SCS1.Deprecated) 1829130561Sobrien Result = ImplicitConversionSequence::Indistinguishable; 1830130561Sobrien break; 1831130561Sobrien 1832130561Sobrien case ImplicitConversionSequence::Indistinguishable: 1833130561Sobrien break; 1834130561Sobrien 1835130561Sobrien case ImplicitConversionSequence::Worse: 1836130561Sobrien if (SCS2.Deprecated) 1837130561Sobrien Result = ImplicitConversionSequence::Indistinguishable; 1838130561Sobrien break; 1839130561Sobrien } 1840130561Sobrien 1841130561Sobrien return Result; 184289857Sobrien} 184389857Sobrien 184489857Sobrien/// CompareDerivedToBaseConversions - Compares two standard conversion 184589857Sobrien/// sequences to determine whether they can be ranked based on their 184689857Sobrien/// various kinds of derived-to-base conversions (C++ 1847130561Sobrien/// [over.ics.rank]p4b3). As part of these checks, we also look at 184889857Sobrien/// conversions between Objective-C interface types. 184989857SobrienImplicitConversionSequence::CompareKind 185089857SobrienSema::CompareDerivedToBaseConversions(const StandardConversionSequence& SCS1, 185189857Sobrien const StandardConversionSequence& SCS2) { 1852130561Sobrien QualType FromType1 = QualType::getFromOpaquePtr(SCS1.FromTypePtr); 185389857Sobrien QualType ToType1 = QualType::getFromOpaquePtr(SCS1.ToTypePtr); 185489857Sobrien QualType FromType2 = QualType::getFromOpaquePtr(SCS2.FromTypePtr); 1855130561Sobrien QualType ToType2 = QualType::getFromOpaquePtr(SCS2.ToTypePtr); 185689857Sobrien 185789857Sobrien // Adjust the types we're converting from via the array-to-pointer 185889857Sobrien // conversion, if we need to. 185989857Sobrien if (SCS1.First == ICK_Array_To_Pointer) 186089857Sobrien FromType1 = Context.getArrayDecayedType(FromType1); 186189857Sobrien if (SCS2.First == ICK_Array_To_Pointer) 1862130561Sobrien FromType2 = Context.getArrayDecayedType(FromType2); 186389857Sobrien 186489857Sobrien // Canonicalize all of the types. 186589857Sobrien FromType1 = Context.getCanonicalType(FromType1); 186689857Sobrien ToType1 = Context.getCanonicalType(ToType1); 1867130561Sobrien FromType2 = Context.getCanonicalType(FromType2); 186889857Sobrien ToType2 = Context.getCanonicalType(ToType2); 186989857Sobrien 1870130561Sobrien // C++ [over.ics.rank]p4b3: 187189857Sobrien // 187289857Sobrien // If class B is derived directly or indirectly from class A and 187389857Sobrien // class C is derived directly or indirectly from B, 187489857Sobrien // 187589857Sobrien // For Objective-C, we let A, B, and C also be Objective-C 187689857Sobrien // interfaces. 187789857Sobrien 1878130561Sobrien // Compare based on pointer conversions. 187989857Sobrien if (SCS1.Second == ICK_Pointer_Conversion && 188089857Sobrien SCS2.Second == ICK_Pointer_Conversion && 188189857Sobrien /*FIXME: Remove if Objective-C id conversions get their own rank*/ 188289857Sobrien FromType1->isPointerType() && FromType2->isPointerType() && 188389857Sobrien ToType1->isPointerType() && ToType2->isPointerType()) { 188489857Sobrien QualType FromPointee1 188589857Sobrien = FromType1->getAs<PointerType>()->getPointeeType().getUnqualifiedType(); 188689857Sobrien QualType ToPointee1 188789857Sobrien = ToType1->getAs<PointerType>()->getPointeeType().getUnqualifiedType(); 188889857Sobrien QualType FromPointee2 188989857Sobrien = FromType2->getAs<PointerType>()->getPointeeType().getUnqualifiedType(); 189089857Sobrien QualType ToPointee2 189189857Sobrien = ToType2->getAs<PointerType>()->getPointeeType().getUnqualifiedType(); 189289857Sobrien 189389857Sobrien const ObjCInterfaceType* FromIface1 = FromPointee1->getAs<ObjCInterfaceType>(); 1894130561Sobrien const ObjCInterfaceType* FromIface2 = FromPointee2->getAs<ObjCInterfaceType>(); 1895130561Sobrien const ObjCInterfaceType* ToIface1 = ToPointee1->getAs<ObjCInterfaceType>(); 189689857Sobrien const ObjCInterfaceType* ToIface2 = ToPointee2->getAs<ObjCInterfaceType>(); 1897130561Sobrien 189889857Sobrien // -- conversion of C* to B* is better than conversion of C* to A*, 189989857Sobrien if (FromPointee1 == FromPointee2 && ToPointee1 != ToPointee2) { 190089857Sobrien if (IsDerivedFrom(ToPointee1, ToPointee2)) 190189857Sobrien return ImplicitConversionSequence::Better; 190289857Sobrien else if (IsDerivedFrom(ToPointee2, ToPointee1)) 1903130561Sobrien return ImplicitConversionSequence::Worse; 190489857Sobrien 190589857Sobrien if (ToIface1 && ToIface2) { 1906130561Sobrien if (Context.canAssignObjCInterfaces(ToIface2, ToIface1)) 190789857Sobrien return ImplicitConversionSequence::Better; 1908130561Sobrien else if (Context.canAssignObjCInterfaces(ToIface1, ToIface2)) 190989857Sobrien return ImplicitConversionSequence::Worse; 1910130561Sobrien } 191189857Sobrien } 1912130561Sobrien 191389857Sobrien // -- conversion of B* to A* is better than conversion of C* to A*, 1914130561Sobrien if (FromPointee1 != FromPointee2 && ToPointee1 == ToPointee2) { 191589857Sobrien if (IsDerivedFrom(FromPointee2, FromPointee1)) 1916130561Sobrien return ImplicitConversionSequence::Better; 191789857Sobrien else if (IsDerivedFrom(FromPointee1, FromPointee2)) 1918130561Sobrien return ImplicitConversionSequence::Worse; 191989857Sobrien 1920130561Sobrien if (FromIface1 && FromIface2) { 192189857Sobrien if (Context.canAssignObjCInterfaces(FromIface1, FromIface2)) 1922130561Sobrien return ImplicitConversionSequence::Better; 192389857Sobrien else if (Context.canAssignObjCInterfaces(FromIface2, FromIface1)) 1924130561Sobrien return ImplicitConversionSequence::Worse; 192589857Sobrien } 1926130561Sobrien } 192789857Sobrien } 1928130561Sobrien 192989857Sobrien // Compare based on reference bindings. 1930130561Sobrien if (SCS1.ReferenceBinding && SCS2.ReferenceBinding && 193189857Sobrien SCS1.Second == ICK_Derived_To_Base) { 1932130561Sobrien // -- binding of an expression of type C to a reference of type 193389857Sobrien // B& is better than binding an expression of type C to a 1934130561Sobrien // reference of type A&, 193589857Sobrien if (Context.hasSameUnqualifiedType(FromType1, FromType2) && 1936130561Sobrien !Context.hasSameUnqualifiedType(ToType1, ToType2)) { 193789857Sobrien if (IsDerivedFrom(ToType1, ToType2)) 1938130561Sobrien return ImplicitConversionSequence::Better; 193989857Sobrien else if (IsDerivedFrom(ToType2, ToType1)) 1940130561Sobrien return ImplicitConversionSequence::Worse; 194189857Sobrien } 1942130561Sobrien 194389857Sobrien // -- binding of an expression of type B to a reference of type 1944130561Sobrien // A& is better than binding an expression of type C to a 194589857Sobrien // reference of type A&, 1946130561Sobrien if (!Context.hasSameUnqualifiedType(FromType1, FromType2) && 194789857Sobrien Context.hasSameUnqualifiedType(ToType1, ToType2)) { 1948130561Sobrien if (IsDerivedFrom(FromType2, FromType1)) 194989857Sobrien return ImplicitConversionSequence::Better; 1950130561Sobrien else if (IsDerivedFrom(FromType1, FromType2)) 195189857Sobrien return ImplicitConversionSequence::Worse; 1952130561Sobrien } 195389857Sobrien } 1954130561Sobrien 195589857Sobrien // Ranking of member-pointer types. 1956130561Sobrien if (SCS1.Second == ICK_Pointer_Member && SCS2.Second == ICK_Pointer_Member && 195789857Sobrien FromType1->isMemberPointerType() && FromType2->isMemberPointerType() && 1958130561Sobrien ToType1->isMemberPointerType() && ToType2->isMemberPointerType()) { 195989857Sobrien const MemberPointerType * FromMemPointer1 = 1960130561Sobrien FromType1->getAs<MemberPointerType>(); 196189857Sobrien const MemberPointerType * ToMemPointer1 = 1962130561Sobrien ToType1->getAs<MemberPointerType>(); 196389857Sobrien const MemberPointerType * FromMemPointer2 = 1964130561Sobrien FromType2->getAs<MemberPointerType>(); 196589857Sobrien const MemberPointerType * ToMemPointer2 = 1966130561Sobrien ToType2->getAs<MemberPointerType>(); 196789857Sobrien const Type *FromPointeeType1 = FromMemPointer1->getClass(); 1968130561Sobrien const Type *ToPointeeType1 = ToMemPointer1->getClass(); 196989857Sobrien const Type *FromPointeeType2 = FromMemPointer2->getClass(); 1970130561Sobrien const Type *ToPointeeType2 = ToMemPointer2->getClass(); 197189857Sobrien QualType FromPointee1 = QualType(FromPointeeType1, 0).getUnqualifiedType(); 1972130561Sobrien QualType ToPointee1 = QualType(ToPointeeType1, 0).getUnqualifiedType(); 197389857Sobrien QualType FromPointee2 = QualType(FromPointeeType2, 0).getUnqualifiedType(); 1974130561Sobrien QualType ToPointee2 = QualType(ToPointeeType2, 0).getUnqualifiedType(); 197589857Sobrien // conversion of A::* to B::* is better than conversion of A::* to C::*, 1976130561Sobrien if (FromPointee1 == FromPointee2 && ToPointee1 != ToPointee2) { 197789857Sobrien if (IsDerivedFrom(ToPointee1, ToPointee2)) 1978130561Sobrien return ImplicitConversionSequence::Worse; 197989857Sobrien else if (IsDerivedFrom(ToPointee2, ToPointee1)) 1980130561Sobrien return ImplicitConversionSequence::Better; 198189857Sobrien } 1982130561Sobrien // conversion of B::* to C::* is better than conversion of A::* to C::* 198389857Sobrien if (ToPointee1 == ToPointee2 && FromPointee1 != FromPointee2) { 1984130561Sobrien if (IsDerivedFrom(FromPointee1, FromPointee2)) 198589857Sobrien return ImplicitConversionSequence::Better; 1986130561Sobrien else if (IsDerivedFrom(FromPointee2, FromPointee1)) 198789857Sobrien return ImplicitConversionSequence::Worse; 1988130561Sobrien } 198989857Sobrien } 1990130561Sobrien 199189857Sobrien if (SCS1.CopyConstructor && SCS2.CopyConstructor && 1992130561Sobrien SCS1.Second == ICK_Derived_To_Base) { 199389857Sobrien // -- conversion of C to B is better than conversion of C to A, 1994130561Sobrien if (Context.hasSameUnqualifiedType(FromType1, FromType2) && 199589857Sobrien !Context.hasSameUnqualifiedType(ToType1, ToType2)) { 1996130561Sobrien if (IsDerivedFrom(ToType1, ToType2)) 199789857Sobrien return ImplicitConversionSequence::Better; 1998130561Sobrien else if (IsDerivedFrom(ToType2, ToType1)) 199989857Sobrien return ImplicitConversionSequence::Worse; 2000130561Sobrien } 200189857Sobrien 2002130561Sobrien // -- conversion of B to A is better than conversion of C to A. 200389857Sobrien if (!Context.hasSameUnqualifiedType(FromType1, FromType2) && 2004130561Sobrien Context.hasSameUnqualifiedType(ToType1, ToType2)) { 200589857Sobrien if (IsDerivedFrom(FromType2, FromType1)) 2006130561Sobrien return ImplicitConversionSequence::Better; 200789857Sobrien else if (IsDerivedFrom(FromType1, FromType2)) 2008130561Sobrien return ImplicitConversionSequence::Worse; 200989857Sobrien } 2010130561Sobrien } 201189857Sobrien 2012130561Sobrien return ImplicitConversionSequence::Indistinguishable; 201389857Sobrien} 2014130561Sobrien 201589857Sobrien/// TryCopyInitialization - Try to copy-initialize a value of type 2016130561Sobrien/// ToType from the expression From. Return the implicit conversion 201789857Sobrien/// sequence required to pass this argument, which may be a bad 2018130561Sobrien/// conversion sequence (meaning that the argument cannot be passed to 201989857Sobrien/// a parameter of this type). If @p SuppressUserConversions, then we 2020130561Sobrien/// do not permit any user-defined conversion sequences. If @p ForceRValue, 202189857Sobrien/// then we treat @p From as an rvalue, even if it is an lvalue. 2022130561SobrienImplicitConversionSequence 202389857SobrienSema::TryCopyInitialization(Expr *From, QualType ToType, 2024130561Sobrien bool SuppressUserConversions, bool ForceRValue, 202589857Sobrien bool InOverloadResolution) { 2026130561Sobrien if (ToType->isReferenceType()) { 202789857Sobrien ImplicitConversionSequence ICS; 2028130561Sobrien CheckReferenceInit(From, ToType, 202989857Sobrien /*FIXME:*/From->getLocStart(), 2030130561Sobrien SuppressUserConversions, 2031130561Sobrien /*AllowExplicit=*/false, 2032130561Sobrien ForceRValue, 2033130561Sobrien &ICS); 2034130561Sobrien return ICS; 2035130561Sobrien } else { 2036130561Sobrien return TryImplicitConversion(From, ToType, 2037130561Sobrien SuppressUserConversions, 2038130561Sobrien /*AllowExplicit=*/false, 2039130561Sobrien ForceRValue, 2040130561Sobrien InOverloadResolution); 2041130561Sobrien } 2042130561Sobrien} 2043130561Sobrien 2044130561Sobrien/// PerformCopyInitialization - Copy-initialize an object of type @p ToType with 2045130561Sobrien/// the expression @p From. Returns true (and emits a diagnostic) if there was 2046130561Sobrien/// an error, returns false if the initialization succeeded. Elidable should 2047130561Sobrien/// be true when the copy may be elided (C++ 12.8p15). Overload resolution works 2048130561Sobrien/// differently in C++0x for this case. 2049130561Sobrienbool Sema::PerformCopyInitialization(Expr *&From, QualType ToType, 2050130561Sobrien const char* Flavor, bool Elidable) { 2051130561Sobrien if (!getLangOptions().CPlusPlus) { 2052130561Sobrien // In C, argument passing is the same as performing an assignment. 2053130561Sobrien QualType FromType = From->getType(); 2054130561Sobrien 2055130561Sobrien AssignConvertType ConvTy = 2056130561Sobrien CheckSingleAssignmentConstraints(ToType, From); 2057130561Sobrien if (ConvTy != Compatible && 2058130561Sobrien CheckTransparentUnionArgumentConstraints(ToType, From) == Compatible) 2059130561Sobrien ConvTy = Compatible; 2060130561Sobrien 2061130561Sobrien return DiagnoseAssignmentResult(ConvTy, From->getLocStart(), ToType, 2062130561Sobrien FromType, From, Flavor); 2063130561Sobrien } 2064130561Sobrien 2065130561Sobrien if (ToType->isReferenceType()) 2066130561Sobrien return CheckReferenceInit(From, ToType, 2067130561Sobrien /*FIXME:*/From->getLocStart(), 2068130561Sobrien /*SuppressUserConversions=*/false, 2069130561Sobrien /*AllowExplicit=*/false, 2070130561Sobrien /*ForceRValue=*/false); 2071130561Sobrien 2072130561Sobrien if (!PerformImplicitConversion(From, ToType, Flavor, 2073130561Sobrien /*AllowExplicit=*/false, Elidable)) 2074130561Sobrien return false; 2075130561Sobrien if (!DiagnoseAmbiguousUserDefinedConversion(From, ToType)) 2076130561Sobrien return Diag(From->getSourceRange().getBegin(), 2077130561Sobrien diag::err_typecheck_convert_incompatible) 2078130561Sobrien << ToType << From->getType() << Flavor << From->getSourceRange(); 2079130561Sobrien return true; 2080130561Sobrien} 2081130561Sobrien 2082130561Sobrien/// TryObjectArgumentInitialization - Try to initialize the object 2083130561Sobrien/// parameter of the given member function (@c Method) from the 2084130561Sobrien/// expression @p From. 2085130561SobrienImplicitConversionSequence 2086130561SobrienSema::TryObjectArgumentInitialization(Expr *From, CXXMethodDecl *Method) { 2087130561Sobrien QualType ClassType = Context.getTypeDeclType(Method->getParent()); 2088130561Sobrien QualType ImplicitParamType 2089130561Sobrien = Context.getCVRQualifiedType(ClassType, Method->getTypeQualifiers()); 2090130561Sobrien 2091130561Sobrien // Set up the conversion sequence as a "bad" conversion, to allow us 2092130561Sobrien // to exit early. 2093130561Sobrien ImplicitConversionSequence ICS; 2094130561Sobrien ICS.Standard.setAsIdentityConversion(); 2095130561Sobrien ICS.ConversionKind = ImplicitConversionSequence::BadConversion; 2096130561Sobrien 2097130561Sobrien // We need to have an object of class type. 2098130561Sobrien QualType FromType = From->getType(); 2099130561Sobrien if (const PointerType *PT = FromType->getAs<PointerType>()) 2100130561Sobrien FromType = PT->getPointeeType(); 2101130561Sobrien 2102130561Sobrien assert(FromType->isRecordType()); 2103130561Sobrien 2104130561Sobrien // The implicit object parmeter is has the type "reference to cv X", 2105130561Sobrien // where X is the class of which the function is a member 2106130561Sobrien // (C++ [over.match.funcs]p4). However, when finding an implicit 2107130561Sobrien // conversion sequence for the argument, we are not allowed to 2108130561Sobrien // create temporaries or perform user-defined conversions 2109130561Sobrien // (C++ [over.match.funcs]p5). We perform a simplified version of 211089857Sobrien // reference binding here, that allows class rvalues to bind to 211189857Sobrien // non-constant references. 2112130561Sobrien 211389857Sobrien // First check the qualifiers. We don't care about lvalue-vs-rvalue 211489857Sobrien // with the implicit object parameter (C++ [over.match.funcs]p5). 2115218822Sdim QualType FromTypeCanon = Context.getCanonicalType(FromType); 2116218822Sdim if (ImplicitParamType.getCVRQualifiers() 2117218822Sdim != FromTypeCanon.getLocalCVRQualifiers() && 2118218822Sdim !ImplicitParamType.isAtLeastAsQualifiedAs(FromTypeCanon)) 2119218822Sdim return ICS; 2120218822Sdim 2121218822Sdim // Check that we have either the same type or a derived type. It 2122218822Sdim // affects the conversion rank. 2123218822Sdim QualType ClassTypeCanon = Context.getCanonicalType(ClassType); 2124218822Sdim if (ClassTypeCanon == FromTypeCanon.getLocalUnqualifiedType()) 2125218822Sdim ICS.Standard.Second = ICK_Identity; 2126218822Sdim else if (IsDerivedFrom(FromType, ClassType)) 2127218822Sdim ICS.Standard.Second = ICK_Derived_To_Base; 2128218822Sdim else 2129218822Sdim return ICS; 2130218822Sdim 213189857Sobrien // Success. Mark this as a reference binding. 213289857Sobrien ICS.ConversionKind = ImplicitConversionSequence::StandardConversion; 213389857Sobrien ICS.Standard.FromTypePtr = FromType.getAsOpaquePtr(); 2134130561Sobrien ICS.Standard.ToTypePtr = ImplicitParamType.getAsOpaquePtr(); 2135130561Sobrien ICS.Standard.ReferenceBinding = true; 213689857Sobrien ICS.Standard.DirectBinding = true; 213789857Sobrien ICS.Standard.RRefBinding = false; 213889857Sobrien return ICS; 2139104834Sobrien} 214089857Sobrien 214189857Sobrien/// PerformObjectArgumentInitialization - Perform initialization of 214289857Sobrien/// the implicit object parameter for the given Method with the given 214389857Sobrien/// expression. 2144218822Sdimbool 2145218822SdimSema::PerformObjectArgumentInitialization(Expr *&From, CXXMethodDecl *Method) { 2146218822Sdim QualType FromRecordType, DestType; 2147218822Sdim QualType ImplicitParamRecordType = 2148218822Sdim Method->getThisType(Context)->getAs<PointerType>()->getPointeeType(); 2149218822Sdim 2150218822Sdim if (const PointerType *PT = From->getType()->getAs<PointerType>()) { 215189857Sobrien FromRecordType = PT->getPointeeType(); 215289857Sobrien DestType = Method->getThisType(Context); 215389857Sobrien } else { 2154130561Sobrien FromRecordType = From->getType(); 215589857Sobrien DestType = ImplicitParamRecordType; 215689857Sobrien } 2157130561Sobrien 2158130561Sobrien ImplicitConversionSequence ICS 2159130561Sobrien = TryObjectArgumentInitialization(From, Method); 216089857Sobrien if (ICS.ConversionKind == ImplicitConversionSequence::BadConversion) 216199461Sobrien return Diag(From->getSourceRange().getBegin(), 216299461Sobrien diag::err_implicit_object_parameter_init) 216399461Sobrien << ImplicitParamRecordType << FromRecordType << From->getSourceRange(); 216499461Sobrien 2165104834Sobrien if (ICS.Standard.Second == ICK_Derived_To_Base && 216699461Sobrien CheckDerivedToBaseConversion(FromRecordType, 216789857Sobrien ImplicitParamRecordType, 216899461Sobrien From->getSourceRange().getBegin(), 216999461Sobrien From->getSourceRange())) 217099461Sobrien return true; 217199461Sobrien 217299461Sobrien ImpCastExprToType(From, DestType, CastExpr::CK_DerivedToBase, 217399461Sobrien /*isLvalue=*/true); 217499461Sobrien return false; 217599461Sobrien} 2176218822Sdim 2177218822Sdim/// TryContextuallyConvertToBool - Attempt to contextually convert the 2178218822Sdim/// expression From to bool (C++0x [conv]p3). 2179218822SdimImplicitConversionSequence Sema::TryContextuallyConvertToBool(Expr *From) { 2180218822Sdim return TryImplicitConversion(From, Context.BoolTy, 2181218822Sdim // FIXME: Are these flags correct? 2182218822Sdim /*SuppressUserConversions=*/false, 2183218822Sdim /*AllowExplicit=*/true, 2184218822Sdim /*ForceRValue=*/false, 2185218822Sdim /*InOverloadResolution=*/false); 2186218822Sdim} 2187218822Sdim 2188218822Sdim/// PerformContextuallyConvertToBool - Perform a contextual conversion 2189218822Sdim/// of the expression From to bool (C++0x [conv]p3). 2190218822Sdimbool Sema::PerformContextuallyConvertToBool(Expr *&From) { 2191218822Sdim ImplicitConversionSequence ICS = TryContextuallyConvertToBool(From); 2192218822Sdim if (!PerformImplicitConversion(From, Context.BoolTy, ICS, "converting")) 2193218822Sdim return false; 2194218822Sdim 2195218822Sdim if (!DiagnoseAmbiguousUserDefinedConversion(From, Context.BoolTy)) 2196218822Sdim return Diag(From->getSourceRange().getBegin(), 2197218822Sdim diag::err_typecheck_bool_condition) 2198218822Sdim << From->getType() << From->getSourceRange(); 2199130561Sobrien return true; 2200130561Sobrien} 2201130561Sobrien 220299461Sobrien/// AddOverloadCandidate - Adds the given function to the set of 220399461Sobrien/// candidate functions, using the given function call arguments. If 2204130561Sobrien/// @p SuppressUserConversions, then don't allow user-defined 220599461Sobrien/// conversions via constructors or conversion operators. 220699461Sobrien/// If @p ForceRValue, treat all arguments as rvalues. This is a slightly 2207130561Sobrien/// hacky way to implement the overloading rules for elidable copy 220899461Sobrien/// initialization in C++0x (C++0x 12.8p15). 220999461Sobrien/// 221099461Sobrien/// \para PartialOverloading true if we are performing "partial" overloading 221199461Sobrien/// based on an incomplete set of function arguments. This feature is used by 221289857Sobrien/// code completion. 2213104834Sobrienvoid 221499461SobrienSema::AddOverloadCandidate(FunctionDecl *Function, 221599461Sobrien Expr **Args, unsigned NumArgs, 221699461Sobrien OverloadCandidateSet& CandidateSet, 221799461Sobrien bool SuppressUserConversions, 221899461Sobrien bool ForceRValue, 2219130561Sobrien bool PartialOverloading) { 222099461Sobrien const FunctionProtoType* Proto 222199461Sobrien = dyn_cast<FunctionProtoType>(Function->getType()->getAs<FunctionType>()); 2222104834Sobrien assert(Proto && "Functions without a prototype cannot be overloaded"); 222399461Sobrien assert(!isa<CXXConversionDecl>(Function) && 222499461Sobrien "Use AddConversionCandidate for conversion functions"); 222589857Sobrien assert(!Function->getDescribedFunctionTemplate() && 222699461Sobrien "Use AddTemplateOverloadCandidate for function templates"); 222799461Sobrien 222899461Sobrien if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Function)) { 222999461Sobrien if (!isa<CXXConstructorDecl>(Method)) { 223099461Sobrien // If we get here, it's because we're calling a member function 223199461Sobrien // that is named without a member access expression (e.g., 223299461Sobrien // "this->f") that was either written explicitly or created 223399461Sobrien // implicitly. This can happen with a qualified call to a member 2234218822Sdim // function, e.g., X::f(). We use a NULL object as the implied 223589857Sobrien // object argument (C++ [over.call.func]p3). 223699461Sobrien AddMethodCandidate(Method, 0, Args, NumArgs, CandidateSet, 223799461Sobrien SuppressUserConversions, ForceRValue); 223899461Sobrien return; 223999461Sobrien } 224089857Sobrien // We treat a constructor like a non-member function, since its object 224199461Sobrien // argument doesn't participate in overload resolution. 224299461Sobrien } 224399461Sobrien 224499461Sobrien if (!CandidateSet.isNewCandidate(Function)) 224599461Sobrien return; 224689857Sobrien 224799461Sobrien if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Function)){ 224899461Sobrien // C++ [class.copy]p3: 224999461Sobrien // A member function template is never instantiated to perform the copy 225089857Sobrien // of a class object to an object of its class type. 225199461Sobrien QualType ClassType = Context.getTypeDeclType(Constructor->getParent()); 225299461Sobrien if (NumArgs == 1 && 225399461Sobrien Constructor->isCopyConstructorLikeSpecialization() && 225499461Sobrien Context.hasSameUnqualifiedType(ClassType, Args[0]->getType())) 2255130561Sobrien return; 2256218822Sdim } 2257218822Sdim 2258218822Sdim // Add this candidate 225999461Sobrien CandidateSet.push_back(OverloadCandidate()); 226089857Sobrien OverloadCandidate& Candidate = CandidateSet.back(); 226199461Sobrien Candidate.Function = Function; 2262130561Sobrien Candidate.Viable = true; 2263130561Sobrien Candidate.IsSurrogate = false; 2264130561Sobrien Candidate.IgnoreObjectArgument = false; 226599461Sobrien 226699461Sobrien unsigned NumArgsInProto = Proto->getNumArgs(); 226799461Sobrien 226899461Sobrien // (C++ 13.3.2p2): A candidate function having fewer than m 226999461Sobrien // parameters is viable only if it has an ellipsis in its parameter 2270104834Sobrien // list (8.3.5). 227199461Sobrien if ((NumArgs + (PartialOverloading && NumArgs)) > NumArgsInProto && 227289857Sobrien !Proto->isVariadic()) { 227399461Sobrien Candidate.Viable = false; 227499461Sobrien return; 227589857Sobrien } 227689857Sobrien 227789857Sobrien // (C++ 13.3.2p2): A candidate function having more than m parameters 227899461Sobrien // is viable only if the (m+1)st parameter has a default argument 2279130561Sobrien // (8.3.6). For the purposes of overload resolution, the 2280130561Sobrien // parameter list is truncated on the right, so that there are 2281130561Sobrien // exactly m parameters. 228299461Sobrien unsigned MinRequiredArgs = Function->getMinRequiredArguments(); 228399461Sobrien if (NumArgs < MinRequiredArgs && !PartialOverloading) { 228499461Sobrien // Not enough arguments. 228599461Sobrien Candidate.Viable = false; 228699461Sobrien return; 2287104834Sobrien } 228899461Sobrien 228999461Sobrien // Determine the implicit conversion sequences for each of the 229099461Sobrien // arguments. 229199461Sobrien Candidate.Conversions.resize(NumArgs); 229299461Sobrien for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) { 229399461Sobrien if (ArgIdx < NumArgsInProto) { 229499461Sobrien // (C++ 13.3.2p3): for F to be a viable function, there shall 229599461Sobrien // exist for each argument an implicit conversion sequence 229699461Sobrien // (13.3.3.1) that converts that argument to the corresponding 229799461Sobrien // parameter of F. 229899461Sobrien QualType ParamType = Proto->getArgType(ArgIdx); 2299130561Sobrien Candidate.Conversions[ArgIdx] 2300130561Sobrien = TryCopyInitialization(Args[ArgIdx], ParamType, 2301130561Sobrien SuppressUserConversions, ForceRValue, 230299461Sobrien /*InOverloadResolution=*/true); 230399461Sobrien if (Candidate.Conversions[ArgIdx].ConversionKind 230499461Sobrien == ImplicitConversionSequence::BadConversion) { 230599461Sobrien // 13.3.3.1-p10 If several different sequences of conversions exist that 230699461Sobrien // each convert the argument to the parameter type, the implicit conversion 230799461Sobrien // sequence associated with the parameter is defined to be the unique conversion 230899461Sobrien // sequence designated the ambiguous conversion sequence. For the purpose of 2309104834Sobrien // ranking implicit conversion sequences as described in 13.3.3.2, the ambiguous 231099461Sobrien // conversion sequence is treated as a user-defined sequence that is 231199461Sobrien // indistinguishable from any other user-defined conversion sequence 231299461Sobrien if (!Candidate.Conversions[ArgIdx].ConversionFunctionSet.empty()) { 231399461Sobrien Candidate.Conversions[ArgIdx].ConversionKind = 231499461Sobrien ImplicitConversionSequence::UserDefinedConversion; 231599461Sobrien // Set the conversion function to one of them. As due to ambiguity, 231699461Sobrien // they carry the same weight and is needed for overload resolution 231799461Sobrien // later. 231899461Sobrien Candidate.Conversions[ArgIdx].UserDefined.ConversionFunction = 231999461Sobrien Candidate.Conversions[ArgIdx].ConversionFunctionSet[0]; 232099461Sobrien } 232199461Sobrien else { 2322130561Sobrien Candidate.Viable = false; 2323130561Sobrien break; 2324130561Sobrien } 232599461Sobrien } 232699461Sobrien } else { 232799461Sobrien // (C++ 13.3.2p2): For the purposes of overload resolution, any 232899461Sobrien // argument for which there is no corresponding parameter is 232999461Sobrien // considered to ""match the ellipsis" (C+ 13.3.3.1.3). 233099461Sobrien Candidate.Conversions[ArgIdx].ConversionKind 233199461Sobrien = ImplicitConversionSequence::EllipsisConversion; 2332104834Sobrien } 233399461Sobrien } 233499461Sobrien} 233599461Sobrien 233699461Sobrien/// \brief Add all of the function declarations in the given function set to 233799461Sobrien/// the overload canddiate set. 233899461Sobrienvoid Sema::AddFunctionCandidates(const FunctionSet &Functions, 233999461Sobrien Expr **Args, unsigned NumArgs, 234099461Sobrien OverloadCandidateSet& CandidateSet, 234199461Sobrien bool SuppressUserConversions) { 234299461Sobrien for (FunctionSet::const_iterator F = Functions.begin(), 234399461Sobrien FEnd = Functions.end(); 234499461Sobrien F != FEnd; ++F) { 234599461Sobrien if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*F)) { 234699461Sobrien if (isa<CXXMethodDecl>(FD) && !cast<CXXMethodDecl>(FD)->isStatic()) 234799461Sobrien AddMethodCandidate(cast<CXXMethodDecl>(FD), 2348130561Sobrien Args[0], Args + 1, NumArgs - 1, 2349130561Sobrien CandidateSet, SuppressUserConversions); 2350130561Sobrien else 235199461Sobrien AddOverloadCandidate(FD, Args, NumArgs, CandidateSet, 235299461Sobrien SuppressUserConversions); 235399461Sobrien } else { 235499461Sobrien FunctionTemplateDecl *FunTmpl = cast<FunctionTemplateDecl>(*F); 235599461Sobrien if (isa<CXXMethodDecl>(FunTmpl->getTemplatedDecl()) && 235699461Sobrien !cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl())->isStatic()) 235799461Sobrien AddMethodTemplateCandidate(FunTmpl, 235899461Sobrien /*FIXME: explicit args */false, 0, 0, 2359104834Sobrien Args[0], Args + 1, NumArgs - 1, 236099461Sobrien CandidateSet, 236199461Sobrien SuppressUserConversions); 236299461Sobrien else 236399461Sobrien AddTemplateOverloadCandidate(FunTmpl, 236499461Sobrien /*FIXME: explicit args */false, 0, 0, 236599461Sobrien Args, NumArgs, CandidateSet, 236699461Sobrien SuppressUserConversions); 236799461Sobrien } 236899461Sobrien } 236999461Sobrien} 237099461Sobrien 237199461Sobrien/// AddMethodCandidate - Adds a named decl (which is some kind of 2372130561Sobrien/// method) as a method candidate to the given overload set. 2373130561Sobrienvoid Sema::AddMethodCandidate(NamedDecl *Decl, Expr *Object, 2374130561Sobrien Expr **Args, unsigned NumArgs, 237599461Sobrien OverloadCandidateSet& CandidateSet, 237699461Sobrien bool SuppressUserConversions, bool ForceRValue) { 237799461Sobrien 237899461Sobrien // FIXME: use this 237999461Sobrien //DeclContext *ActingContext = Decl->getDeclContext(); 2380104834Sobrien 238199461Sobrien if (isa<UsingShadowDecl>(Decl)) 238299461Sobrien Decl = cast<UsingShadowDecl>(Decl)->getTargetDecl(); 238399461Sobrien 238499461Sobrien if (FunctionTemplateDecl *TD = dyn_cast<FunctionTemplateDecl>(Decl)) { 238599461Sobrien assert(isa<CXXMethodDecl>(TD->getTemplatedDecl()) && 238699461Sobrien "Expected a member function template"); 238799461Sobrien AddMethodTemplateCandidate(TD, false, 0, 0, 238899461Sobrien Object, Args, NumArgs, 238999461Sobrien CandidateSet, 239099461Sobrien SuppressUserConversions, 239199461Sobrien ForceRValue); 239299461Sobrien } else { 2393130561Sobrien AddMethodCandidate(cast<CXXMethodDecl>(Decl), Object, Args, NumArgs, 2394130561Sobrien CandidateSet, SuppressUserConversions, ForceRValue); 2395130561Sobrien } 2396130561Sobrien} 2397130561Sobrien 2398130561Sobrien/// AddMethodCandidate - Adds the given C++ member function to the set 2399130561Sobrien/// of candidate functions, using the given function call arguments 2400130561Sobrien/// and the object argument (@c Object). For example, in a call 2401218822Sdim/// @c o.f(a1,a2), @c Object will contain @c o and @c Args will contain 2402218822Sdim/// both @c a1 and @c a2. If @p SuppressUserConversions, then don't 2403218822Sdim/// allow user-defined conversions via constructors or conversion 2404218822Sdim/// operators. If @p ForceRValue, treat all arguments as rvalues. This is 2405130561Sobrien/// a slightly hacky way to implement the overloading rules for elidable copy 2406130561Sobrien/// initialization in C++0x (C++0x 12.8p15). 2407130561Sobrienvoid 2408130561SobrienSema::AddMethodCandidate(CXXMethodDecl *Method, Expr *Object, 2409130561Sobrien Expr **Args, unsigned NumArgs, 2410130561Sobrien OverloadCandidateSet& CandidateSet, 2411218822Sdim bool SuppressUserConversions, bool ForceRValue) { 2412218822Sdim const FunctionProtoType* Proto 2413218822Sdim = dyn_cast<FunctionProtoType>(Method->getType()->getAs<FunctionType>()); 2414130561Sobrien assert(Proto && "Methods without a prototype cannot be overloaded"); 2415130561Sobrien assert(!isa<CXXConversionDecl>(Method) && 2416130561Sobrien "Use AddConversionCandidate for conversion functions"); 2417130561Sobrien assert(!isa<CXXConstructorDecl>(Method) && 2418130561Sobrien "Use AddOverloadCandidate for constructors"); 2419130561Sobrien 2420130561Sobrien if (!CandidateSet.isNewCandidate(Method)) 2421130561Sobrien return; 2422130561Sobrien 2423130561Sobrien // Add this candidate 2424130561Sobrien CandidateSet.push_back(OverloadCandidate()); 2425130561Sobrien OverloadCandidate& Candidate = CandidateSet.back(); 2426130561Sobrien Candidate.Function = Method; 2427130561Sobrien Candidate.IsSurrogate = false; 2428218822Sdim Candidate.IgnoreObjectArgument = false; 2429218822Sdim 2430218822Sdim unsigned NumArgsInProto = Proto->getNumArgs(); 2431218822Sdim 2432218822Sdim // (C++ 13.3.2p2): A candidate function having fewer than m 2433218822Sdim // parameters is viable only if it has an ellipsis in its parameter 2434218822Sdim // list (8.3.5). 2435130561Sobrien if (NumArgs > NumArgsInProto && !Proto->isVariadic()) { 2436130561Sobrien Candidate.Viable = false; 2437218822Sdim return; 2438218822Sdim } 2439218822Sdim 2440218822Sdim // (C++ 13.3.2p2): A candidate function having more than m parameters 2441218822Sdim // is viable only if the (m+1)st parameter has a default argument 2442218822Sdim // (8.3.6). For the purposes of overload resolution, the 2443218822Sdim // parameter list is truncated on the right, so that there are 2444218822Sdim // exactly m parameters. 2445218822Sdim unsigned MinRequiredArgs = Method->getMinRequiredArguments(); 2446218822Sdim if (NumArgs < MinRequiredArgs) { 2447218822Sdim // Not enough arguments. 2448104834Sobrien Candidate.Viable = false; 2449104834Sobrien return; 245089857Sobrien } 2451130561Sobrien 2452130561Sobrien Candidate.Viable = true; 245389857Sobrien Candidate.Conversions.resize(NumArgs + 1); 2454104834Sobrien 2455104834Sobrien if (Method->isStatic() || !Object) 2456104834Sobrien // The implicit object argument is ignored. 245789857Sobrien Candidate.IgnoreObjectArgument = true; 2458104834Sobrien else { 2459104834Sobrien // Determine the implicit conversion sequence for the object 2460104834Sobrien // parameter. 2461104834Sobrien Candidate.Conversions[0] = TryObjectArgumentInitialization(Object, Method); 2462104834Sobrien if (Candidate.Conversions[0].ConversionKind 2463104834Sobrien == ImplicitConversionSequence::BadConversion) { 2464104834Sobrien Candidate.Viable = false; 2465130561Sobrien return; 246689857Sobrien } 246789857Sobrien } 2468130561Sobrien 2469130561Sobrien // Determine the implicit conversion sequences for each of the 2470130561Sobrien // arguments. 2471130561Sobrien for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) { 2472130561Sobrien if (ArgIdx < NumArgsInProto) { 2473218822Sdim // (C++ 13.3.2p3): for F to be a viable function, there shall 2474130561Sobrien // exist for each argument an implicit conversion sequence 2475130561Sobrien // (13.3.3.1) that converts that argument to the corresponding 2476130561Sobrien // parameter of F. 2477130561Sobrien QualType ParamType = Proto->getArgType(ArgIdx); 2478130561Sobrien Candidate.Conversions[ArgIdx + 1] 2479130561Sobrien = TryCopyInitialization(Args[ArgIdx], ParamType, 2480130561Sobrien SuppressUserConversions, ForceRValue, 2481130561Sobrien /*InOverloadResolution=*/true); 2482130561Sobrien if (Candidate.Conversions[ArgIdx + 1].ConversionKind 2483130561Sobrien == ImplicitConversionSequence::BadConversion) { 2484130561Sobrien Candidate.Viable = false; 2485130561Sobrien break; 2486218822Sdim } 2487130561Sobrien } else { 2488130561Sobrien // (C++ 13.3.2p2): For the purposes of overload resolution, any 2489130561Sobrien // argument for which there is no corresponding parameter is 2490218822Sdim // considered to ""match the ellipsis" (C+ 13.3.3.1.3). 2491130561Sobrien Candidate.Conversions[ArgIdx + 1].ConversionKind 2492130561Sobrien = ImplicitConversionSequence::EllipsisConversion; 2493130561Sobrien } 2494130561Sobrien } 2495130561Sobrien} 2496130561Sobrien 2497130561Sobrien/// \brief Add a C++ member function template as a candidate to the candidate 2498130561Sobrien/// set, using template argument deduction to produce an appropriate member 2499130561Sobrien/// function template specialization. 2500130561Sobrienvoid 2501130561SobrienSema::AddMethodTemplateCandidate(FunctionTemplateDecl *MethodTmpl, 2502130561Sobrien bool HasExplicitTemplateArgs, 2503130561Sobrien const TemplateArgumentLoc *ExplicitTemplateArgs, 2504130561Sobrien unsigned NumExplicitTemplateArgs, 2505130561Sobrien Expr *Object, Expr **Args, unsigned NumArgs, 2506130561Sobrien OverloadCandidateSet& CandidateSet, 2507218822Sdim bool SuppressUserConversions, 2508218822Sdim bool ForceRValue) { 2509218822Sdim if (!CandidateSet.isNewCandidate(MethodTmpl)) 2510218822Sdim return; 2511218822Sdim 2512218822Sdim // C++ [over.match.funcs]p7: 2513218822Sdim // In each case where a candidate is a function template, candidate 2514218822Sdim // function template specializations are generated using template argument 2515218822Sdim // deduction (14.8.3, 14.8.2). Those candidates are then handled as 2516218822Sdim // candidate functions in the usual way.113) A given name can refer to one 2517218822Sdim // or more function templates and also to a set of overloaded non-template 2518218822Sdim // functions. In such a case, the candidate functions generated from each 2519218822Sdim // function template are combined with the set of non-template candidate 2520218822Sdim // functions. 2521218822Sdim TemplateDeductionInfo Info(Context); 2522218822Sdim FunctionDecl *Specialization = 0; 2523218822Sdim if (TemplateDeductionResult Result 2524218822Sdim = DeduceTemplateArguments(MethodTmpl, HasExplicitTemplateArgs, 2525218822Sdim ExplicitTemplateArgs, NumExplicitTemplateArgs, 2526218822Sdim Args, NumArgs, Specialization, Info)) { 2527218822Sdim // FIXME: Record what happened with template argument deduction, so 2528218822Sdim // that we can give the user a beautiful diagnostic. 2529218822Sdim (void)Result; 2530218822Sdim return; 2531218822Sdim } 2532218822Sdim 2533218822Sdim // Add the function template specialization produced by template argument 2534218822Sdim // deduction as a candidate. 2535218822Sdim assert(Specialization && "Missing member function template specialization?"); 2536218822Sdim assert(isa<CXXMethodDecl>(Specialization) && 2537218822Sdim "Specialization is not a member function?"); 2538218822Sdim AddMethodCandidate(cast<CXXMethodDecl>(Specialization), Object, Args, NumArgs, 2539218822Sdim CandidateSet, SuppressUserConversions, ForceRValue); 2540218822Sdim} 2541218822Sdim 2542218822Sdim/// \brief Add a C++ function template specialization as a candidate 2543218822Sdim/// in the candidate set, using template argument deduction to produce 2544218822Sdim/// an appropriate function template specialization. 2545218822Sdimvoid 2546218822SdimSema::AddTemplateOverloadCandidate(FunctionTemplateDecl *FunctionTemplate, 2547218822Sdim bool HasExplicitTemplateArgs, 2548218822Sdim const TemplateArgumentLoc *ExplicitTemplateArgs, 2549218822Sdim unsigned NumExplicitTemplateArgs, 2550218822Sdim Expr **Args, unsigned NumArgs, 2551218822Sdim OverloadCandidateSet& CandidateSet, 2552218822Sdim bool SuppressUserConversions, 2553218822Sdim bool ForceRValue) { 255489857Sobrien if (!CandidateSet.isNewCandidate(FunctionTemplate)) 255589857Sobrien return; 2556104834Sobrien 2557130561Sobrien // C++ [over.match.funcs]p7: 2558130561Sobrien // In each case where a candidate is a function template, candidate 255989857Sobrien // function template specializations are generated using template argument 256089857Sobrien // deduction (14.8.3, 14.8.2). Those candidates are then handled as 256189857Sobrien // candidate functions in the usual way.113) A given name can refer to one 2562107492Sobrien // or more function templates and also to a set of overloaded non-template 256389857Sobrien // functions. In such a case, the candidate functions generated from each 256489857Sobrien // function template are combined with the set of non-template candidate 256589857Sobrien // functions. 256689857Sobrien TemplateDeductionInfo Info(Context); 256789857Sobrien FunctionDecl *Specialization = 0; 2568218822Sdim if (TemplateDeductionResult Result 2569130561Sobrien = DeduceTemplateArguments(FunctionTemplate, HasExplicitTemplateArgs, 257089857Sobrien ExplicitTemplateArgs, NumExplicitTemplateArgs, 2571218822Sdim Args, NumArgs, Specialization, Info)) { 2572130561Sobrien // FIXME: Record what happened with template argument deduction, so 257389857Sobrien // that we can give the user a beautiful diagnostic. 2574218822Sdim (void)Result; 257589857Sobrien return; 257689857Sobrien } 2577130561Sobrien 257889857Sobrien // Add the function template specialization produced by template argument 257989857Sobrien // deduction as a candidate. 2580130561Sobrien assert(Specialization && "Missing function template specialization?"); 258189857Sobrien AddOverloadCandidate(Specialization, Args, NumArgs, CandidateSet, 2582130561Sobrien SuppressUserConversions, ForceRValue); 2583130561Sobrien} 2584130561Sobrien 2585218822Sdim/// AddConversionCandidate - Add a C++ conversion function as a 2586130561Sobrien/// candidate in the candidate set (C++ [over.match.conv], 2587218822Sdim/// C++ [over.match.copy]). From is the expression we're converting from, 2588218822Sdim/// and ToType is the type that we're eventually trying to convert to 2589218822Sdim/// (which may or may not be the same type as the type that the 2590218822Sdim/// conversion function produces). 2591218822Sdimvoid 2592218822SdimSema::AddConversionCandidate(CXXConversionDecl *Conversion, 2593218822Sdim Expr *From, QualType ToType, 2594130561Sobrien OverloadCandidateSet& CandidateSet) { 2595130561Sobrien assert(!Conversion->getDescribedFunctionTemplate() && 2596218822Sdim "Conversion function templates use AddTemplateConversionCandidate"); 2597218822Sdim 2598218822Sdim if (!CandidateSet.isNewCandidate(Conversion)) 2599218822Sdim return; 2600218822Sdim 2601218822Sdim // Add this candidate 2602130561Sobrien CandidateSet.push_back(OverloadCandidate()); 2603130561Sobrien OverloadCandidate& Candidate = CandidateSet.back(); 2604130561Sobrien Candidate.Function = Conversion; 2605130561Sobrien Candidate.IsSurrogate = false; 2606130561Sobrien Candidate.IgnoreObjectArgument = false; 2607130561Sobrien Candidate.FinalConversion.setAsIdentityConversion(); 2608130561Sobrien Candidate.FinalConversion.FromTypePtr 2609130561Sobrien = Conversion->getConversionType().getAsOpaquePtr(); 2610218822Sdim Candidate.FinalConversion.ToTypePtr = ToType.getAsOpaquePtr(); 2611130561Sobrien 2612218822Sdim // Determine the implicit conversion sequence for the implicit 2613130561Sobrien // object parameter. 2614218822Sdim Candidate.Viable = true; 2615218822Sdim Candidate.Conversions.resize(1); 2616218822Sdim Candidate.Conversions[0] = TryObjectArgumentInitialization(From, Conversion); 2617218822Sdim // Conversion functions to a different type in the base class is visible in 2618218822Sdim // the derived class. So, a derived to base conversion should not participate 2619218822Sdim // in overload resolution. 2620218822Sdim if (Candidate.Conversions[0].Standard.Second == ICK_Derived_To_Base) 2621218822Sdim Candidate.Conversions[0].Standard.Second = ICK_Identity; 2622218822Sdim if (Candidate.Conversions[0].ConversionKind 2623218822Sdim == ImplicitConversionSequence::BadConversion) { 2624130561Sobrien Candidate.Viable = false; 2625130561Sobrien return; 2626130561Sobrien } 2627130561Sobrien 2628130561Sobrien // We won't go through a user-define type conversion function to convert a 2629130561Sobrien // derived to base as such conversions are given Conversion Rank. They only 2630130561Sobrien // go through a copy constructor. 13.3.3.1.2-p4 [over.ics.user] 2631130561Sobrien QualType FromCanon 2632218822Sdim = Context.getCanonicalType(From->getType().getUnqualifiedType()); 2633218822Sdim QualType ToCanon = Context.getCanonicalType(ToType).getUnqualifiedType(); 2634218822Sdim if (FromCanon == ToCanon || IsDerivedFrom(FromCanon, ToCanon)) { 2635218822Sdim Candidate.Viable = false; 2636130561Sobrien return; 2637218822Sdim } 2638218822Sdim 2639218822Sdim 2640218822Sdim // To determine what the conversion from the result of calling the 2641218822Sdim // conversion function to the type we're eventually trying to 2642130561Sobrien // convert to (ToType), we need to synthesize a call to the 2643130561Sobrien // conversion function and attempt copy initialization from it. This 2644130561Sobrien // makes sure that we get the right semantics with respect to 2645218822Sdim // lvalues/rvalues and the type. Fortunately, we can allocate this 2646218822Sdim // call on the stack and we don't need its arguments to be 2647218822Sdim // well-formed. 2648218822Sdim DeclRefExpr ConversionRef(Conversion, Conversion->getType(), 2649218822Sdim From->getLocStart()); 2650218822Sdim ImplicitCastExpr ConversionFn(Context.getPointerType(Conversion->getType()), 2651218822Sdim CastExpr::CK_FunctionToPointerDecay, 2652218822Sdim &ConversionRef, false); 2653218822Sdim 2654218822Sdim // Note that it is safe to allocate CallExpr on the stack here because 265589857Sobrien // there are 0 arguments (i.e., nothing is allocated using ASTContext's 2656218822Sdim // allocator). 2657218822Sdim CallExpr Call(Context, &ConversionFn, 0, 0, 2658218822Sdim Conversion->getConversionType().getNonReferenceType(), 2659218822Sdim From->getLocStart()); 2660218822Sdim ImplicitConversionSequence ICS = 2661218822Sdim TryCopyInitialization(&Call, ToType, 2662218822Sdim /*SuppressUserConversions=*/true, 2663218822Sdim /*ForceRValue=*/false, 2664218822Sdim /*InOverloadResolution=*/false); 2665218822Sdim 2666218822Sdim switch (ICS.ConversionKind) { 2667218822Sdim case ImplicitConversionSequence::StandardConversion: 2668218822Sdim Candidate.FinalConversion = ICS.Standard; 2669218822Sdim break; 2670218822Sdim 2671218822Sdim case ImplicitConversionSequence::BadConversion: 2672218822Sdim Candidate.Viable = false; 2673218822Sdim break; 2674218822Sdim 2675218822Sdim default: 2676218822Sdim assert(false && 2677218822Sdim "Can only end up with a standard conversion sequence or failure"); 2678218822Sdim } 2679218822Sdim} 2680218822Sdim 2681218822Sdim/// \brief Adds a conversion function template specialization 2682218822Sdim/// candidate to the overload set, using template argument deduction 2683218822Sdim/// to deduce the template arguments of the conversion function 2684218822Sdim/// template from the type that we are converting to (C++ 2685218822Sdim/// [temp.deduct.conv]). 2686218822Sdimvoid 2687218822SdimSema::AddTemplateConversionCandidate(FunctionTemplateDecl *FunctionTemplate, 2688218822Sdim Expr *From, QualType ToType, 2689218822Sdim OverloadCandidateSet &CandidateSet) { 2690218822Sdim assert(isa<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()) && 2691218822Sdim "Only conversion function templates permitted here"); 2692218822Sdim 2693218822Sdim if (!CandidateSet.isNewCandidate(FunctionTemplate)) 2694218822Sdim return; 2695218822Sdim 2696218822Sdim TemplateDeductionInfo Info(Context); 2697218822Sdim CXXConversionDecl *Specialization = 0; 2698218822Sdim if (TemplateDeductionResult Result 2699218822Sdim = DeduceTemplateArguments(FunctionTemplate, ToType, 2700218822Sdim Specialization, Info)) { 2701218822Sdim // FIXME: Record what happened with template argument deduction, so 2702218822Sdim // that we can give the user a beautiful diagnostic. 2703218822Sdim (void)Result; 2704218822Sdim return; 2705218822Sdim } 2706218822Sdim 2707218822Sdim // Add the conversion function template specialization produced by 2708218822Sdim // template argument deduction as a candidate. 2709218822Sdim assert(Specialization && "Missing function template specialization?"); 2710218822Sdim AddConversionCandidate(Specialization, From, ToType, CandidateSet); 2711218822Sdim} 2712218822Sdim 2713218822Sdim/// AddSurrogateCandidate - Adds a "surrogate" candidate function that 2714218822Sdim/// converts the given @c Object to a function pointer via the 2715218822Sdim/// conversion function @c Conversion, and then attempts to call it 2716218822Sdim/// with the given arguments (C++ [over.call.object]p2-4). Proto is 2717218822Sdim/// the type of function that we'll eventually be calling. 2718218822Sdimvoid Sema::AddSurrogateCandidate(CXXConversionDecl *Conversion, 2719218822Sdim const FunctionProtoType *Proto, 2720218822Sdim Expr *Object, Expr **Args, unsigned NumArgs, 2721218822Sdim OverloadCandidateSet& CandidateSet) { 2722218822Sdim if (!CandidateSet.isNewCandidate(Conversion)) 2723218822Sdim return; 2724218822Sdim 2725218822Sdim CandidateSet.push_back(OverloadCandidate()); 2726218822Sdim OverloadCandidate& Candidate = CandidateSet.back(); 2727218822Sdim Candidate.Function = 0; 2728218822Sdim Candidate.Surrogate = Conversion; 2729218822Sdim Candidate.Viable = true; 2730218822Sdim Candidate.IsSurrogate = true; 2731218822Sdim Candidate.IgnoreObjectArgument = false; 2732218822Sdim Candidate.Conversions.resize(NumArgs + 1); 2733218822Sdim 2734218822Sdim // Determine the implicit conversion sequence for the implicit 2735218822Sdim // object parameter. 2736218822Sdim ImplicitConversionSequence ObjectInit 2737218822Sdim = TryObjectArgumentInitialization(Object, Conversion); 2738218822Sdim if (ObjectInit.ConversionKind == ImplicitConversionSequence::BadConversion) { 2739218822Sdim Candidate.Viable = false; 2740218822Sdim return; 2741218822Sdim } 2742218822Sdim 2743218822Sdim // The first conversion is actually a user-defined conversion whose 2744218822Sdim // first conversion is ObjectInit's standard conversion (which is 2745218822Sdim // effectively a reference binding). Record it as such. 2746218822Sdim Candidate.Conversions[0].ConversionKind 2747218822Sdim = ImplicitConversionSequence::UserDefinedConversion; 2748218822Sdim Candidate.Conversions[0].UserDefined.Before = ObjectInit.Standard; 2749218822Sdim Candidate.Conversions[0].UserDefined.EllipsisConversion = false; 2750218822Sdim Candidate.Conversions[0].UserDefined.ConversionFunction = Conversion; 2751218822Sdim Candidate.Conversions[0].UserDefined.After 2752218822Sdim = Candidate.Conversions[0].UserDefined.Before; 2753218822Sdim Candidate.Conversions[0].UserDefined.After.setAsIdentityConversion(); 2754218822Sdim 2755218822Sdim // Find the 2756218822Sdim unsigned NumArgsInProto = Proto->getNumArgs(); 2757218822Sdim 2758218822Sdim // (C++ 13.3.2p2): A candidate function having fewer than m 2759218822Sdim // parameters is viable only if it has an ellipsis in its parameter 2760218822Sdim // list (8.3.5). 2761218822Sdim if (NumArgs > NumArgsInProto && !Proto->isVariadic()) { 2762218822Sdim Candidate.Viable = false; 2763218822Sdim return; 2764218822Sdim } 2765218822Sdim 2766218822Sdim // Function types don't have any default arguments, so just check if 2767218822Sdim // we have enough arguments. 2768218822Sdim if (NumArgs < NumArgsInProto) { 2769218822Sdim // Not enough arguments. 2770218822Sdim Candidate.Viable = false; 2771218822Sdim return; 2772218822Sdim } 2773218822Sdim 2774218822Sdim // Determine the implicit conversion sequences for each of the 2775218822Sdim // arguments. 2776218822Sdim for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) { 2777218822Sdim if (ArgIdx < NumArgsInProto) { 2778218822Sdim // (C++ 13.3.2p3): for F to be a viable function, there shall 2779218822Sdim // exist for each argument an implicit conversion sequence 2780218822Sdim // (13.3.3.1) that converts that argument to the corresponding 2781218822Sdim // parameter of F. 2782218822Sdim QualType ParamType = Proto->getArgType(ArgIdx); 2783218822Sdim Candidate.Conversions[ArgIdx + 1] 2784218822Sdim = TryCopyInitialization(Args[ArgIdx], ParamType, 2785218822Sdim /*SuppressUserConversions=*/false, 2786218822Sdim /*ForceRValue=*/false, 2787218822Sdim /*InOverloadResolution=*/false); 2788218822Sdim if (Candidate.Conversions[ArgIdx + 1].ConversionKind 2789218822Sdim == ImplicitConversionSequence::BadConversion) { 2790218822Sdim Candidate.Viable = false; 2791218822Sdim break; 2792218822Sdim } 2793218822Sdim } else { 2794218822Sdim // (C++ 13.3.2p2): For the purposes of overload resolution, any 2795218822Sdim // argument for which there is no corresponding parameter is 2796218822Sdim // considered to ""match the ellipsis" (C+ 13.3.3.1.3). 2797218822Sdim Candidate.Conversions[ArgIdx + 1].ConversionKind 2798218822Sdim = ImplicitConversionSequence::EllipsisConversion; 2799218822Sdim } 2800218822Sdim } 2801218822Sdim} 2802218822Sdim 2803218822Sdim// FIXME: This will eventually be removed, once we've migrated all of the 2804218822Sdim// operator overloading logic over to the scheme used by binary operators, which 2805218822Sdim// works for template instantiation. 2806218822Sdimvoid Sema::AddOperatorCandidates(OverloadedOperatorKind Op, Scope *S, 2807218822Sdim SourceLocation OpLoc, 2808218822Sdim Expr **Args, unsigned NumArgs, 2809218822Sdim OverloadCandidateSet& CandidateSet, 2810218822Sdim SourceRange OpRange) { 2811218822Sdim FunctionSet Functions; 2812218822Sdim 2813218822Sdim QualType T1 = Args[0]->getType(); 2814218822Sdim QualType T2; 2815218822Sdim if (NumArgs > 1) 2816218822Sdim T2 = Args[1]->getType(); 2817218822Sdim 2818218822Sdim DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(Op); 2819218822Sdim if (S) 2820218822Sdim LookupOverloadedOperatorName(Op, S, T1, T2, Functions); 2821218822Sdim ArgumentDependentLookup(OpName, /*Operator*/true, Args, NumArgs, Functions); 2822218822Sdim AddFunctionCandidates(Functions, Args, NumArgs, CandidateSet); 2823218822Sdim AddMemberOperatorCandidates(Op, OpLoc, Args, NumArgs, CandidateSet, OpRange); 2824218822Sdim AddBuiltinOperatorCandidates(Op, OpLoc, Args, NumArgs, CandidateSet); 2825218822Sdim} 2826218822Sdim 2827218822Sdim/// \brief Add overload candidates for overloaded operators that are 2828218822Sdim/// member functions. 2829218822Sdim/// 2830218822Sdim/// Add the overloaded operator candidates that are member functions 2831218822Sdim/// for the operator Op that was used in an operator expression such 2832218822Sdim/// as "x Op y". , Args/NumArgs provides the operator arguments, and 2833218822Sdim/// CandidateSet will store the added overload candidates. (C++ 2834218822Sdim/// [over.match.oper]). 2835218822Sdimvoid Sema::AddMemberOperatorCandidates(OverloadedOperatorKind Op, 2836218822Sdim SourceLocation OpLoc, 2837218822Sdim Expr **Args, unsigned NumArgs, 2838218822Sdim OverloadCandidateSet& CandidateSet, 2839218822Sdim SourceRange OpRange) { 2840218822Sdim DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(Op); 2841218822Sdim 2842218822Sdim // C++ [over.match.oper]p3: 2843218822Sdim // For a unary operator @ with an operand of a type whose 2844218822Sdim // cv-unqualified version is T1, and for a binary operator @ with 2845218822Sdim // a left operand of a type whose cv-unqualified version is T1 and 2846218822Sdim // a right operand of a type whose cv-unqualified version is T2, 2847218822Sdim // three sets of candidate functions, designated member 2848218822Sdim // candidates, non-member candidates and built-in candidates, are 2849218822Sdim // constructed as follows: 2850218822Sdim QualType T1 = Args[0]->getType(); 2851218822Sdim QualType T2; 2852218822Sdim if (NumArgs > 1) 2853218822Sdim T2 = Args[1]->getType(); 2854218822Sdim 2855218822Sdim // -- If T1 is a class type, the set of member candidates is the 2856218822Sdim // result of the qualified lookup of T1::operator@ 2857218822Sdim // (13.3.1.1.1); otherwise, the set of member candidates is 2858218822Sdim // empty. 2859218822Sdim if (const RecordType *T1Rec = T1->getAs<RecordType>()) { 2860218822Sdim // Complete the type if it can be completed. Otherwise, we're done. 2861218822Sdim if (RequireCompleteType(OpLoc, T1, PDiag())) 2862218822Sdim return; 2863218822Sdim 2864218822Sdim LookupResult Operators(*this, OpName, OpLoc, LookupOrdinaryName); 2865218822Sdim LookupQualifiedName(Operators, T1Rec->getDecl()); 2866218822Sdim Operators.suppressDiagnostics(); 2867218822Sdim 2868218822Sdim for (LookupResult::iterator Oper = Operators.begin(), 2869218822Sdim OperEnd = Operators.end(); 2870218822Sdim Oper != OperEnd; 2871218822Sdim ++Oper) 2872218822Sdim AddMethodCandidate(*Oper, Args[0], Args + 1, NumArgs - 1, CandidateSet, 2873218822Sdim /* SuppressUserConversions = */ false); 2874218822Sdim } 2875218822Sdim} 2876218822Sdim 2877218822Sdim/// AddBuiltinCandidate - Add a candidate for a built-in 2878218822Sdim/// operator. ResultTy and ParamTys are the result and parameter types 2879218822Sdim/// of the built-in candidate, respectively. Args and NumArgs are the 2880218822Sdim/// arguments being passed to the candidate. IsAssignmentOperator 2881218822Sdim/// should be true when this built-in candidate is an assignment 2882218822Sdim/// operator. NumContextualBoolArguments is the number of arguments 2883218822Sdim/// (at the beginning of the argument list) that will be contextually 2884218822Sdim/// converted to bool. 2885218822Sdimvoid Sema::AddBuiltinCandidate(QualType ResultTy, QualType *ParamTys, 2886218822Sdim Expr **Args, unsigned NumArgs, 2887218822Sdim OverloadCandidateSet& CandidateSet, 2888218822Sdim bool IsAssignmentOperator, 2889218822Sdim unsigned NumContextualBoolArguments) { 2890218822Sdim // Add this candidate 2891218822Sdim CandidateSet.push_back(OverloadCandidate()); 2892218822Sdim OverloadCandidate& Candidate = CandidateSet.back(); 2893218822Sdim Candidate.Function = 0; 2894218822Sdim Candidate.IsSurrogate = false; 2895218822Sdim Candidate.IgnoreObjectArgument = false; 2896218822Sdim Candidate.BuiltinTypes.ResultTy = ResultTy; 2897218822Sdim for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) 2898218822Sdim Candidate.BuiltinTypes.ParamTypes[ArgIdx] = ParamTys[ArgIdx]; 2899218822Sdim 2900218822Sdim // Determine the implicit conversion sequences for each of the 2901218822Sdim // arguments. 2902218822Sdim Candidate.Viable = true; 2903218822Sdim Candidate.Conversions.resize(NumArgs); 2904218822Sdim for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) { 2905218822Sdim // C++ [over.match.oper]p4: 2906218822Sdim // For the built-in assignment operators, conversions of the 2907218822Sdim // left operand are restricted as follows: 2908218822Sdim // -- no temporaries are introduced to hold the left operand, and 2909218822Sdim // -- no user-defined conversions are applied to the left 2910218822Sdim // operand to achieve a type match with the left-most 2911218822Sdim // parameter of a built-in candidate. 2912218822Sdim // 2913218822Sdim // We block these conversions by turning off user-defined 2914218822Sdim // conversions, since that is the only way that initialization of 2915218822Sdim // a reference to a non-class type can occur from something that 2916218822Sdim // is not of the same type. 2917218822Sdim if (ArgIdx < NumContextualBoolArguments) { 2918218822Sdim assert(ParamTys[ArgIdx] == Context.BoolTy && 2919218822Sdim "Contextual conversion to bool requires bool type"); 2920218822Sdim Candidate.Conversions[ArgIdx] = TryContextuallyConvertToBool(Args[ArgIdx]); 2921218822Sdim } else { 2922218822Sdim Candidate.Conversions[ArgIdx] 2923218822Sdim = TryCopyInitialization(Args[ArgIdx], ParamTys[ArgIdx], 2924218822Sdim ArgIdx == 0 && IsAssignmentOperator, 2925218822Sdim /*ForceRValue=*/false, 2926218822Sdim /*InOverloadResolution=*/false); 2927218822Sdim } 2928218822Sdim if (Candidate.Conversions[ArgIdx].ConversionKind 2929218822Sdim == ImplicitConversionSequence::BadConversion) { 2930218822Sdim Candidate.Viable = false; 2931218822Sdim break; 2932218822Sdim } 2933218822Sdim } 2934218822Sdim} 2935218822Sdim 2936218822Sdim/// BuiltinCandidateTypeSet - A set of types that will be used for the 2937218822Sdim/// candidate operator functions for built-in operators (C++ 2938218822Sdim/// [over.built]). The types are separated into pointer types and 2939218822Sdim/// enumeration types. 2940218822Sdimclass BuiltinCandidateTypeSet { 2941218822Sdim /// TypeSet - A set of types. 2942218822Sdim typedef llvm::SmallPtrSet<QualType, 8> TypeSet; 2943218822Sdim 2944218822Sdim /// PointerTypes - The set of pointer types that will be used in the 2945218822Sdim /// built-in candidates. 2946218822Sdim TypeSet PointerTypes; 2947218822Sdim 2948218822Sdim /// MemberPointerTypes - The set of member pointer types that will be 2949218822Sdim /// used in the built-in candidates. 2950218822Sdim TypeSet MemberPointerTypes; 2951218822Sdim 2952218822Sdim /// EnumerationTypes - The set of enumeration types that will be 2953218822Sdim /// used in the built-in candidates. 2954218822Sdim TypeSet EnumerationTypes; 2955218822Sdim 2956218822Sdim /// Sema - The semantic analysis instance where we are building the 2957218822Sdim /// candidate type set. 2958218822Sdim Sema &SemaRef; 2959218822Sdim 2960218822Sdim /// Context - The AST context in which we will build the type sets. 2961218822Sdim ASTContext &Context; 2962218822Sdim 2963218822Sdim bool AddPointerWithMoreQualifiedTypeVariants(QualType Ty, 2964218822Sdim const Qualifiers &VisibleQuals); 2965218822Sdim bool AddMemberPointerWithMoreQualifiedTypeVariants(QualType Ty); 2966218822Sdim 2967218822Sdimpublic: 2968218822Sdim /// iterator - Iterates through the types that are part of the set. 2969218822Sdim typedef TypeSet::iterator iterator; 2970218822Sdim 2971218822Sdim BuiltinCandidateTypeSet(Sema &SemaRef) 2972218822Sdim : SemaRef(SemaRef), Context(SemaRef.Context) { } 2973218822Sdim 2974218822Sdim void AddTypesConvertedFrom(QualType Ty, 2975218822Sdim SourceLocation Loc, 2976218822Sdim bool AllowUserConversions, 2977218822Sdim bool AllowExplicitConversions, 2978218822Sdim const Qualifiers &VisibleTypeConversionsQuals); 2979218822Sdim 2980218822Sdim /// pointer_begin - First pointer type found; 2981218822Sdim iterator pointer_begin() { return PointerTypes.begin(); } 2982218822Sdim 2983218822Sdim /// pointer_end - Past the last pointer type found; 2984218822Sdim iterator pointer_end() { return PointerTypes.end(); } 2985218822Sdim 2986218822Sdim /// member_pointer_begin - First member pointer type found; 2987218822Sdim iterator member_pointer_begin() { return MemberPointerTypes.begin(); } 2988218822Sdim 2989218822Sdim /// member_pointer_end - Past the last member pointer type found; 2990218822Sdim iterator member_pointer_end() { return MemberPointerTypes.end(); } 2991218822Sdim 2992218822Sdim /// enumeration_begin - First enumeration type found; 2993218822Sdim iterator enumeration_begin() { return EnumerationTypes.begin(); } 2994218822Sdim 2995218822Sdim /// enumeration_end - Past the last enumeration type found; 2996218822Sdim iterator enumeration_end() { return EnumerationTypes.end(); } 2997218822Sdim}; 2998218822Sdim 2999218822Sdim/// AddPointerWithMoreQualifiedTypeVariants - Add the pointer type @p Ty to 3000218822Sdim/// the set of pointer types along with any more-qualified variants of 3001218822Sdim/// that type. For example, if @p Ty is "int const *", this routine 3002218822Sdim/// will add "int const *", "int const volatile *", "int const 3003218822Sdim/// restrict *", and "int const volatile restrict *" to the set of 3004218822Sdim/// pointer types. Returns true if the add of @p Ty itself succeeded, 3005218822Sdim/// false otherwise. 3006218822Sdim/// 3007218822Sdim/// FIXME: what to do about extended qualifiers? 3008218822Sdimbool 3009218822SdimBuiltinCandidateTypeSet::AddPointerWithMoreQualifiedTypeVariants(QualType Ty, 3010218822Sdim const Qualifiers &VisibleQuals) { 3011218822Sdim 3012218822Sdim // Insert this type. 3013218822Sdim if (!PointerTypes.insert(Ty)) 3014218822Sdim return false; 3015218822Sdim 3016218822Sdim const PointerType *PointerTy = Ty->getAs<PointerType>(); 3017218822Sdim assert(PointerTy && "type was not a pointer type!"); 3018218822Sdim 3019218822Sdim QualType PointeeTy = PointerTy->getPointeeType(); 3020218822Sdim unsigned BaseCVR = PointeeTy.getCVRQualifiers(); 3021218822Sdim if (const ConstantArrayType *Array =Context.getAsConstantArrayType(PointeeTy)) 3022218822Sdim BaseCVR = Array->getElementType().getCVRQualifiers(); 3023218822Sdim bool hasVolatile = VisibleQuals.hasVolatile(); 3024218822Sdim bool hasRestrict = VisibleQuals.hasRestrict(); 3025218822Sdim 3026218822Sdim // Iterate through all strict supersets of BaseCVR. 3027218822Sdim for (unsigned CVR = BaseCVR+1; CVR <= Qualifiers::CVRMask; ++CVR) { 3028218822Sdim if ((CVR | BaseCVR) != CVR) continue; 3029218822Sdim // Skip over Volatile/Restrict if no Volatile/Restrict found anywhere 3030218822Sdim // in the types. 3031218822Sdim if ((CVR & Qualifiers::Volatile) && !hasVolatile) continue; 3032218822Sdim if ((CVR & Qualifiers::Restrict) && !hasRestrict) continue; 3033218822Sdim QualType QPointeeTy = Context.getCVRQualifiedType(PointeeTy, CVR); 3034218822Sdim PointerTypes.insert(Context.getPointerType(QPointeeTy)); 3035218822Sdim } 3036218822Sdim 3037218822Sdim return true; 3038218822Sdim} 3039218822Sdim 3040218822Sdim/// AddMemberPointerWithMoreQualifiedTypeVariants - Add the pointer type @p Ty 3041218822Sdim/// to the set of pointer types along with any more-qualified variants of 3042218822Sdim/// that type. For example, if @p Ty is "int const *", this routine 3043218822Sdim/// will add "int const *", "int const volatile *", "int const 3044218822Sdim/// restrict *", and "int const volatile restrict *" to the set of 3045218822Sdim/// pointer types. Returns true if the add of @p Ty itself succeeded, 3046218822Sdim/// false otherwise. 3047218822Sdim/// 3048218822Sdim/// FIXME: what to do about extended qualifiers? 3049218822Sdimbool 3050218822SdimBuiltinCandidateTypeSet::AddMemberPointerWithMoreQualifiedTypeVariants( 3051218822Sdim QualType Ty) { 3052218822Sdim // Insert this type. 3053218822Sdim if (!MemberPointerTypes.insert(Ty)) 3054218822Sdim return false; 305589857Sobrien 305689857Sobrien const MemberPointerType *PointerTy = Ty->getAs<MemberPointerType>(); 305789857Sobrien assert(PointerTy && "type was not a member pointer type!"); 305889857Sobrien 305989857Sobrien QualType PointeeTy = PointerTy->getPointeeType(); 306089857Sobrien const Type *ClassTy = PointerTy->getClass(); 306189857Sobrien 306289857Sobrien // Iterate through all strict supersets of the pointee type's CVR 306389857Sobrien // qualifiers. 306489857Sobrien unsigned BaseCVR = PointeeTy.getCVRQualifiers(); 306589857Sobrien for (unsigned CVR = BaseCVR+1; CVR <= Qualifiers::CVRMask; ++CVR) { 306689857Sobrien if ((CVR | BaseCVR) != CVR) continue; 306789857Sobrien 306889857Sobrien QualType QPointeeTy = Context.getCVRQualifiedType(PointeeTy, CVR); 306989857Sobrien MemberPointerTypes.insert(Context.getMemberPointerType(QPointeeTy, ClassTy)); 307089857Sobrien } 307189857Sobrien 307289857Sobrien return true; 307389857Sobrien} 307489857Sobrien 307589857Sobrien/// AddTypesConvertedFrom - Add each of the types to which the type @p 307689857Sobrien/// Ty can be implicit converted to the given set of @p Types. We're 307789857Sobrien/// primarily interested in pointer types and enumeration types. We also 307889857Sobrien/// take member pointer types, for the conditional operator. 307989857Sobrien/// AllowUserConversions is true if we should look at the conversion 308089857Sobrien/// functions of a class type, and AllowExplicitConversions if we 308189857Sobrien/// should also include the explicit conversion functions of a class 308289857Sobrien/// type. 308389857Sobrienvoid 308489857SobrienBuiltinCandidateTypeSet::AddTypesConvertedFrom(QualType Ty, 308589857Sobrien SourceLocation Loc, 308689857Sobrien bool AllowUserConversions, 308789857Sobrien bool AllowExplicitConversions, 308889857Sobrien const Qualifiers &VisibleQuals) { 308989857Sobrien // Only deal with canonical types. 309089857Sobrien Ty = Context.getCanonicalType(Ty); 309189857Sobrien 309289857Sobrien // Look through reference types; they aren't part of the type of an 309389857Sobrien // expression for the purposes of conversions. 309489857Sobrien if (const ReferenceType *RefTy = Ty->getAs<ReferenceType>()) 3095130561Sobrien Ty = RefTy->getPointeeType(); 309689857Sobrien 309789857Sobrien // We don't care about qualifiers on the type. 309889857Sobrien Ty = Ty.getLocalUnqualifiedType(); 309989857Sobrien 310089857Sobrien // If we're dealing with an array type, decay to the pointer. 310189857Sobrien if (Ty->isArrayType()) 310289857Sobrien Ty = SemaRef.Context.getArrayDecayedType(Ty); 310389857Sobrien 310489857Sobrien if (const PointerType *PointerTy = Ty->getAs<PointerType>()) { 310589857Sobrien QualType PointeeTy = PointerTy->getPointeeType(); 310689857Sobrien 310789857Sobrien // Insert our type, and its more-qualified variants, into the set 310889857Sobrien // of types. 310989857Sobrien if (!AddPointerWithMoreQualifiedTypeVariants(Ty, VisibleQuals)) 311089857Sobrien return; 311189857Sobrien } else if (Ty->isMemberPointerType()) { 311289857Sobrien // Member pointers are far easier, since the pointee can't be converted. 311389857Sobrien if (!AddMemberPointerWithMoreQualifiedTypeVariants(Ty)) 311489857Sobrien return; 311589857Sobrien } else if (Ty->isEnumeralType()) { 311689857Sobrien EnumerationTypes.insert(Ty); 311789857Sobrien } else if (AllowUserConversions) { 311889857Sobrien if (const RecordType *TyRec = Ty->getAs<RecordType>()) { 311989857Sobrien if (SemaRef.RequireCompleteType(Loc, Ty, 0)) { 312089857Sobrien // No conversion functions in incomplete types. 3121218822Sdim return; 312289857Sobrien } 3123218822Sdim 3124218822Sdim CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(TyRec->getDecl()); 3125218822Sdim OverloadedFunctionDecl *Conversions 3126218822Sdim = ClassDecl->getVisibleConversionFunctions(); 312789857Sobrien for (OverloadedFunctionDecl::function_iterator Func 312889857Sobrien = Conversions->function_begin(); 312989857Sobrien Func != Conversions->function_end(); ++Func) { 313089857Sobrien CXXConversionDecl *Conv; 313189857Sobrien FunctionTemplateDecl *ConvTemplate; 313289857Sobrien GetFunctionAndTemplate(*Func, Conv, ConvTemplate); 313389857Sobrien 313489857Sobrien // Skip conversion function templates; they don't tell us anything 313589857Sobrien // about which builtin types we can convert to. 313689857Sobrien if (ConvTemplate) 313789857Sobrien continue; 313889857Sobrien 313989857Sobrien if (AllowExplicitConversions || !Conv->isExplicit()) { 314089857Sobrien AddTypesConvertedFrom(Conv->getConversionType(), Loc, false, false, 314189857Sobrien VisibleQuals); 314289857Sobrien } 314389857Sobrien } 314489857Sobrien } 314589857Sobrien } 314689857Sobrien} 3147130561Sobrien 3148130561Sobrien/// \brief Helper function for AddBuiltinOperatorCandidates() that adds 3149130561Sobrien/// the volatile- and non-volatile-qualified assignment operators for the 3150130561Sobrien/// given type to the candidate set. 3151130561Sobrienstatic void AddBuiltinAssignmentOperatorCandidates(Sema &S, 3152130561Sobrien QualType T, 3153130561Sobrien Expr **Args, 3154130561Sobrien unsigned NumArgs, 3155130561Sobrien OverloadCandidateSet &CandidateSet) { 3156130561Sobrien QualType ParamTypes[2]; 3157130561Sobrien 3158130561Sobrien // T& operator=(T&, T) 3159130561Sobrien ParamTypes[0] = S.Context.getLValueReferenceType(T); 3160130561Sobrien ParamTypes[1] = T; 3161130561Sobrien S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet, 3162130561Sobrien /*IsAssignmentOperator=*/true); 3163130561Sobrien 3164130561Sobrien if (!S.Context.getCanonicalType(T).isVolatileQualified()) { 3165130561Sobrien // volatile T& operator=(volatile T&, T) 3166130561Sobrien ParamTypes[0] 3167130561Sobrien = S.Context.getLValueReferenceType(S.Context.getVolatileType(T)); 3168130561Sobrien ParamTypes[1] = T; 3169130561Sobrien S.AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet, 3170130561Sobrien /*IsAssignmentOperator=*/true); 3171130561Sobrien } 3172130561Sobrien} 3173130561Sobrien 3174130561Sobrien/// CollectVRQualifiers - This routine returns Volatile/Restrict qualifiers, 3175130561Sobrien/// if any, found in visible type conversion functions found in ArgExpr's type. 3176130561Sobrienstatic Qualifiers CollectVRQualifiers(ASTContext &Context, Expr* ArgExpr) { 3177130561Sobrien Qualifiers VRQuals; 3178130561Sobrien const RecordType *TyRec; 3179130561Sobrien if (const MemberPointerType *RHSMPType = 3180130561Sobrien ArgExpr->getType()->getAs<MemberPointerType>()) 3181130561Sobrien TyRec = cast<RecordType>(RHSMPType->getClass()); 3182130561Sobrien else 3183130561Sobrien TyRec = ArgExpr->getType()->getAs<RecordType>(); 3184130561Sobrien if (!TyRec) { 3185130561Sobrien // Just to be safe, assume the worst case. 3186130561Sobrien VRQuals.addVolatile(); 3187130561Sobrien VRQuals.addRestrict(); 3188130561Sobrien return VRQuals; 3189130561Sobrien } 319089857Sobrien 3191130561Sobrien CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(TyRec->getDecl()); 3192130561Sobrien OverloadedFunctionDecl *Conversions = 319389857Sobrien ClassDecl->getVisibleConversionFunctions(); 3194130561Sobrien 3195104834Sobrien for (OverloadedFunctionDecl::function_iterator Func 3196104834Sobrien = Conversions->function_begin(); 3197130561Sobrien Func != Conversions->function_end(); ++Func) { 319889857Sobrien if (CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(*Func)) { 3199130561Sobrien QualType CanTy = Context.getCanonicalType(Conv->getConversionType()); 3200130561Sobrien if (const ReferenceType *ResTypeRef = CanTy->getAs<ReferenceType>()) 3201130561Sobrien CanTy = ResTypeRef->getPointeeType(); 3202130561Sobrien // Need to go down the pointer/mempointer chain and add qualifiers 3203130561Sobrien // as see them. 3204130561Sobrien bool done = false; 3205130561Sobrien while (!done) { 3206130561Sobrien if (const PointerType *ResTypePtr = CanTy->getAs<PointerType>()) 3207130561Sobrien CanTy = ResTypePtr->getPointeeType(); 3208130561Sobrien else if (const MemberPointerType *ResTypeMPtr = 3209130561Sobrien CanTy->getAs<MemberPointerType>()) 3210130561Sobrien CanTy = ResTypeMPtr->getPointeeType(); 3211130561Sobrien else 3212130561Sobrien done = true; 3213130561Sobrien if (CanTy.isVolatileQualified()) 3214130561Sobrien VRQuals.addVolatile(); 3215130561Sobrien if (CanTy.isRestrictQualified()) 3216104834Sobrien VRQuals.addRestrict(); 3217104834Sobrien if (VRQuals.hasRestrict() && VRQuals.hasVolatile()) 3218104834Sobrien return VRQuals; 321989857Sobrien } 3220104834Sobrien } 3221104834Sobrien } 3222104834Sobrien return VRQuals; 3223104834Sobrien} 3224104834Sobrien 3225104834Sobrien/// AddBuiltinOperatorCandidates - Add the appropriate built-in 3226104834Sobrien/// operator overloads to the candidate set (C++ [over.built]), based 3227104834Sobrien/// on the operator @p Op and the arguments given. For example, if the 3228104834Sobrien/// operator is a binary '+', this routine might add "int 3229107492Sobrien/// operator+(int, int)" to cover integer addition. 3230107492Sobrienvoid 3231104834SobrienSema::AddBuiltinOperatorCandidates(OverloadedOperatorKind Op, 3232104834Sobrien SourceLocation OpLoc, 3233104834Sobrien Expr **Args, unsigned NumArgs, 3234104834Sobrien OverloadCandidateSet& CandidateSet) { 3235218822Sdim // The set of "promoted arithmetic types", which are the arithmetic 3236218822Sdim // types are that preserved by promotion (C++ [over.built]p2). Note 3237218822Sdim // that the first few of these types are the promoted integral 3238218822Sdim // types; these types need to be first. 3239107492Sobrien // FIXME: What about complex? 3240104834Sobrien const unsigned FirstIntegralType = 0; 3241107492Sobrien const unsigned LastIntegralType = 13; 3242107492Sobrien const unsigned FirstPromotedIntegralType = 7, 3243104834Sobrien LastPromotedIntegralType = 13; 3244107492Sobrien const unsigned FirstPromotedArithmeticType = 7, 3245104834Sobrien LastPromotedArithmeticType = 16; 3246130561Sobrien const unsigned NumArithmeticTypes = 16; 3247130561Sobrien QualType ArithmeticTypes[NumArithmeticTypes] = { 3248130561Sobrien Context.BoolTy, Context.CharTy, Context.WCharTy, 3249130561Sobrien// FIXME: Context.Char16Ty, Context.Char32Ty, 3250130561Sobrien Context.SignedCharTy, Context.ShortTy, 3251130561Sobrien Context.UnsignedCharTy, Context.UnsignedShortTy, 3252130561Sobrien Context.IntTy, Context.LongTy, Context.LongLongTy, 3253130561Sobrien Context.UnsignedIntTy, Context.UnsignedLongTy, Context.UnsignedLongLongTy, 3254130561Sobrien Context.FloatTy, Context.DoubleTy, Context.LongDoubleTy 3255130561Sobrien }; 3256130561Sobrien assert(ArithmeticTypes[FirstPromotedIntegralType] == Context.IntTy && 3257130561Sobrien "Invalid first promoted integral type"); 3258130561Sobrien assert(ArithmeticTypes[LastPromotedIntegralType - 1] 3259130561Sobrien == Context.UnsignedLongLongTy && 3260130561Sobrien "Invalid last promoted integral type"); 3261130561Sobrien assert(ArithmeticTypes[FirstPromotedArithmeticType] == Context.IntTy && 3262130561Sobrien "Invalid first promoted arithmetic type"); 3263104834Sobrien assert(ArithmeticTypes[LastPromotedArithmeticType - 1] 3264104834Sobrien == Context.LongDoubleTy && 3265104834Sobrien "Invalid last promoted arithmetic type"); 3266104834Sobrien 3267104834Sobrien // Find all of the types that the arguments can convert to, but only 3268130561Sobrien // if the operator we're looking at has built-in operator candidates 3269104834Sobrien // that make use of these types. 3270130561Sobrien Qualifiers VisibleTypeConversionsQuals; 3271104834Sobrien VisibleTypeConversionsQuals.addConst(); 3272104834Sobrien for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) 3273104834Sobrien VisibleTypeConversionsQuals += CollectVRQualifiers(Context, Args[ArgIdx]); 3274104834Sobrien 3275104834Sobrien BuiltinCandidateTypeSet CandidateTypes(*this); 3276104834Sobrien if (Op == OO_Less || Op == OO_Greater || Op == OO_LessEqual || 3277104834Sobrien Op == OO_GreaterEqual || Op == OO_EqualEqual || Op == OO_ExclaimEqual || 3278104834Sobrien Op == OO_Plus || (Op == OO_Minus && NumArgs == 2) || Op == OO_Equal || 3279130561Sobrien Op == OO_PlusEqual || Op == OO_MinusEqual || Op == OO_Subscript || 3280130561Sobrien Op == OO_ArrowStar || Op == OO_PlusPlus || Op == OO_MinusMinus || 3281104834Sobrien (Op == OO_Star && NumArgs == 1) || Op == OO_Conditional) { 3282104834Sobrien for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) 3283104834Sobrien CandidateTypes.AddTypesConvertedFrom(Args[ArgIdx]->getType(), 3284104834Sobrien OpLoc, 3285104834Sobrien true, 3286104834Sobrien (Op == OO_Exclaim || 3287104834Sobrien Op == OO_AmpAmp || 3288104834Sobrien Op == OO_PipePipe), 3289104834Sobrien VisibleTypeConversionsQuals); 3290104834Sobrien } 3291104834Sobrien 3292104834Sobrien bool isComparison = false; 3293104834Sobrien switch (Op) { 3294104834Sobrien case OO_None: 3295130561Sobrien case NUM_OVERLOADED_OPERATORS: 3296130561Sobrien assert(false && "Expected an overloaded operator"); 3297130561Sobrien break; 3298104834Sobrien 3299104834Sobrien case OO_Star: // '*' is either unary or binary 3300104834Sobrien if (NumArgs == 1) 3301104834Sobrien goto UnaryStar; 3302104834Sobrien else 3303104834Sobrien goto BinaryStar; 3304104834Sobrien break; 3305104834Sobrien 3306104834Sobrien case OO_Plus: // '+' is either unary or binary 3307104834Sobrien if (NumArgs == 1) 3308218822Sdim goto UnaryPlus; 3309104834Sobrien else 3310104834Sobrien goto BinaryPlus; 3311104834Sobrien break; 3312104834Sobrien 3313104834Sobrien case OO_Minus: // '-' is either unary or binary 3314104834Sobrien if (NumArgs == 1) 331589857Sobrien goto UnaryMinus; 331689857Sobrien else 331789857Sobrien goto BinaryMinus; 331889857Sobrien break; 3319218822Sdim 3320218822Sdim case OO_Amp: // '&' is either unary or binary 3321218822Sdim if (NumArgs == 1) 3322218822Sdim goto UnaryAmp; 3323104834Sobrien else 3324218822Sdim goto BinaryAmp; 3325218822Sdim 3326218822Sdim case OO_PlusPlus: 3327218822Sdim case OO_MinusMinus: 332889857Sobrien // C++ [over.built]p3: 332989857Sobrien // 333089857Sobrien // For every pair (T, VQ), where T is an arithmetic type, and VQ 3331104834Sobrien // is either volatile or empty, there exist candidate operator 3332218822Sdim // functions of the form 3333104834Sobrien // 333489857Sobrien // VQ T& operator++(VQ T&); 333589857Sobrien // T operator++(VQ T&, int); 333689857Sobrien // 3337218822Sdim // C++ [over.built]p4: 3338130561Sobrien // 3339218822Sdim // For every pair (T, VQ), where T is an arithmetic type other 3340218822Sdim // than bool, and VQ is either volatile or empty, there exist 3341218822Sdim // candidate operator functions of the form 3342130561Sobrien // 3343130561Sobrien // VQ T& operator--(VQ T&); 3344218822Sdim // T operator--(VQ T&, int); 3345218822Sdim for (unsigned Arith = (Op == OO_PlusPlus? 0 : 1); 3346218822Sdim Arith < NumArithmeticTypes; ++Arith) { 3347130561Sobrien QualType ArithTy = ArithmeticTypes[Arith]; 3348130561Sobrien QualType ParamTypes[2] 3349130561Sobrien = { Context.getLValueReferenceType(ArithTy), Context.IntTy }; 3350130561Sobrien 3351130561Sobrien // Non-volatile version. 3352130561Sobrien if (NumArgs == 1) 3353130561Sobrien AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1, CandidateSet); 3354130561Sobrien else 3355130561Sobrien AddBuiltinCandidate(ArithTy, ParamTypes, Args, 2, CandidateSet); 3356130561Sobrien // heuristic to reduce number of builtin candidates in the set. 3357130561Sobrien // Add volatile version only if there are conversions to a volatile type. 3358130561Sobrien if (VisibleTypeConversionsQuals.hasVolatile()) { 3359130561Sobrien // Volatile version 3360130561Sobrien ParamTypes[0] 3361130561Sobrien = Context.getLValueReferenceType(Context.getVolatileType(ArithTy)); 3362130561Sobrien if (NumArgs == 1) 336389857Sobrien AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1, CandidateSet); 336489857Sobrien else 336589857Sobrien AddBuiltinCandidate(ArithTy, ParamTypes, Args, 2, CandidateSet); 336689857Sobrien } 336789857Sobrien } 336889857Sobrien 336989857Sobrien // C++ [over.built]p5: 337089857Sobrien // 3371104834Sobrien // For every pair (T, VQ), where T is a cv-qualified or 3372104834Sobrien // cv-unqualified object type, and VQ is either volatile or 3373104834Sobrien // empty, there exist candidate operator functions of the form 3374104834Sobrien // 3375104834Sobrien // T*VQ& operator++(T*VQ&); 3376104834Sobrien // T*VQ& operator--(T*VQ&); 3377104834Sobrien // T* operator++(T*VQ&, int); 3378104834Sobrien // T* operator--(T*VQ&, int); 3379104834Sobrien for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); 3380104834Sobrien Ptr != CandidateTypes.pointer_end(); ++Ptr) { 3381130561Sobrien // Skip pointer types that aren't pointers to object types. 3382130561Sobrien if (!(*Ptr)->getAs<PointerType>()->getPointeeType()->isObjectType()) 3383104834Sobrien continue; 3384104834Sobrien 3385104834Sobrien QualType ParamTypes[2] = { 3386104834Sobrien Context.getLValueReferenceType(*Ptr), Context.IntTy 3387104834Sobrien }; 3388104834Sobrien 3389104834Sobrien // Without volatile 3390104834Sobrien if (NumArgs == 1) 3391130561Sobrien AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1, CandidateSet); 3392130561Sobrien else 3393104834Sobrien AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); 3394104834Sobrien 3395130561Sobrien if (!Context.getCanonicalType(*Ptr).isVolatileQualified() && 3396130561Sobrien VisibleTypeConversionsQuals.hasVolatile()) { 3397130561Sobrien // With volatile 3398130561Sobrien ParamTypes[0] 3399130561Sobrien = Context.getLValueReferenceType(Context.getVolatileType(*Ptr)); 3400130561Sobrien if (NumArgs == 1) 3401130561Sobrien AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 1, CandidateSet); 3402104834Sobrien else 3403130561Sobrien AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); 3404218822Sdim } 3405218822Sdim } 3406218822Sdim break; 3407130561Sobrien 3408104834Sobrien UnaryStar: 3409104834Sobrien // C++ [over.built]p6: 341089857Sobrien // For every cv-qualified or cv-unqualified object type T, there 3411130561Sobrien // exist candidate operator functions of the form 3412130561Sobrien // 3413130561Sobrien // T& operator*(T*); 3414130561Sobrien // 3415130561Sobrien // C++ [over.built]p7: 3416130561Sobrien // For every function type T, there exist candidate operator 341792828Sobrien // functions of the form 3418130561Sobrien // T& operator*(T*); 3419130561Sobrien for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); 342089857Sobrien Ptr != CandidateTypes.pointer_end(); ++Ptr) { 3421218822Sdim QualType ParamTy = *Ptr; 3422218822Sdim QualType PointeeTy = ParamTy->getAs<PointerType>()->getPointeeType(); 3423218822Sdim AddBuiltinCandidate(Context.getLValueReferenceType(PointeeTy), 3424130561Sobrien &ParamTy, Args, 1, CandidateSet); 3425130561Sobrien } 3426130561Sobrien break; 3427130561Sobrien 3428218822Sdim UnaryPlus: 3429218822Sdim // C++ [over.built]p8: 3430218822Sdim // For every type T, there exist candidate operator functions of 3431130561Sobrien // the form 3432218822Sdim // 3433130561Sobrien // T* operator+(T*); 3434218822Sdim for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); 3435218822Sdim Ptr != CandidateTypes.pointer_end(); ++Ptr) { 3436218822Sdim QualType ParamTy = *Ptr; 3437218822Sdim AddBuiltinCandidate(ParamTy, &ParamTy, Args, 1, CandidateSet); 343889857Sobrien } 3439218822Sdim 344089857Sobrien // Fall through 3441218822Sdim 3442218822Sdim UnaryMinus: 3443104834Sobrien // C++ [over.built]p9: 3444104834Sobrien // For every promoted arithmetic type T, there exist candidate 3445104834Sobrien // operator functions of the form 3446104834Sobrien // 344789857Sobrien // T operator+(T); 344889857Sobrien // T operator-(T); 344989857Sobrien for (unsigned Arith = FirstPromotedArithmeticType; 345089857Sobrien Arith < LastPromotedArithmeticType; ++Arith) { 3451218822Sdim QualType ArithTy = ArithmeticTypes[Arith]; 3452218822Sdim AddBuiltinCandidate(ArithTy, &ArithTy, Args, 1, CandidateSet); 3453218822Sdim } 3454218822Sdim break; 3455218822Sdim 3456218822Sdim case OO_Tilde: 345789857Sobrien // C++ [over.built]p10: 345889857Sobrien // For every promoted integral type T, there exist candidate 345989857Sobrien // operator functions of the form 346089857Sobrien // 346189857Sobrien // T operator~(T); 3462104834Sobrien for (unsigned Int = FirstPromotedIntegralType; 3463104834Sobrien Int < LastPromotedIntegralType; ++Int) { 3464104834Sobrien QualType IntTy = ArithmeticTypes[Int]; 3465104834Sobrien AddBuiltinCandidate(IntTy, &IntTy, Args, 1, CandidateSet); 3466104834Sobrien } 3467104834Sobrien break; 3468104834Sobrien 3469104834Sobrien case OO_New: 3470104834Sobrien case OO_Delete: 3471104834Sobrien case OO_Array_New: 3472104834Sobrien case OO_Array_Delete: 3473130561Sobrien case OO_Call: 3474130561Sobrien assert(false && "Special operators don't use AddBuiltinOperatorCandidates"); 3475130561Sobrien break; 3476104834Sobrien 3477104834Sobrien case OO_Comma: 3478104834Sobrien UnaryAmp: 3479104834Sobrien case OO_Arrow: 3480104834Sobrien // C++ [over.match.oper]p3: 3481104834Sobrien // -- For the operator ',', the unary operator '&', or the 3482104834Sobrien // operator '->', the built-in candidates set is empty. 3483104834Sobrien break; 3484104834Sobrien 3485104834Sobrien case OO_EqualEqual: 3486104834Sobrien case OO_ExclaimEqual: 3487104834Sobrien // C++ [over.match.oper]p16: 3488104834Sobrien // For every pointer to member type T, there exist candidate operator 3489104834Sobrien // functions of the form 3490104834Sobrien // 3491104834Sobrien // bool operator==(T,T); 3492104834Sobrien // bool operator!=(T,T); 3493104834Sobrien for (BuiltinCandidateTypeSet::iterator 3494130561Sobrien MemPtr = CandidateTypes.member_pointer_begin(), 3495104834Sobrien MemPtrEnd = CandidateTypes.member_pointer_end(); 3496104834Sobrien MemPtr != MemPtrEnd; 3497104834Sobrien ++MemPtr) { 3498104834Sobrien QualType ParamTypes[2] = { *MemPtr, *MemPtr }; 3499104834Sobrien AddBuiltinCandidate(Context.BoolTy, ParamTypes, Args, 2, CandidateSet); 3500104834Sobrien } 3501104834Sobrien 3502104834Sobrien // Fall through 3503104834Sobrien 3504104834Sobrien case OO_Less: 3505104834Sobrien case OO_Greater: 3506104834Sobrien case OO_LessEqual: 3507104834Sobrien case OO_GreaterEqual: 3508104834Sobrien // C++ [over.built]p15: 3509130561Sobrien // 3510130561Sobrien // For every pointer or enumeration type T, there exist 3511130561Sobrien // candidate operator functions of the form 3512104834Sobrien // 3513104834Sobrien // bool operator<(T, T); 3514104834Sobrien // bool operator>(T, T); 3515104834Sobrien // bool operator<=(T, T); 3516104834Sobrien // bool operator>=(T, T); 3517104834Sobrien // bool operator==(T, T); 3518104834Sobrien // bool operator!=(T, T); 3519104834Sobrien for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); 3520104834Sobrien Ptr != CandidateTypes.pointer_end(); ++Ptr) { 3521104834Sobrien QualType ParamTypes[2] = { *Ptr, *Ptr }; 3522104834Sobrien AddBuiltinCandidate(Context.BoolTy, ParamTypes, Args, 2, CandidateSet); 3523104834Sobrien } 3524104834Sobrien for (BuiltinCandidateTypeSet::iterator Enum 3525104834Sobrien = CandidateTypes.enumeration_begin(); 3526104834Sobrien Enum != CandidateTypes.enumeration_end(); ++Enum) { 3527104834Sobrien QualType ParamTypes[2] = { *Enum, *Enum }; 3528104834Sobrien AddBuiltinCandidate(Context.BoolTy, ParamTypes, Args, 2, CandidateSet); 3529104834Sobrien } 3530104834Sobrien 3531104834Sobrien // Fall through. 3532104834Sobrien isComparison = true; 3533104834Sobrien 3534104834Sobrien BinaryPlus: 3535104834Sobrien BinaryMinus: 3536104834Sobrien if (!isComparison) { 353789857Sobrien // We didn't fall through, so we must have OO_Plus or OO_Minus. 353889857Sobrien 353989857Sobrien // C++ [over.built]p13: 3540130561Sobrien // 3541130561Sobrien // For every cv-qualified or cv-unqualified object type T 3542130561Sobrien // there exist candidate operator functions of the form 354389857Sobrien // 354489857Sobrien // T* operator+(T*, ptrdiff_t); 354589857Sobrien // T& operator[](T*, ptrdiff_t); [BELOW] 354689857Sobrien // T* operator-(T*, ptrdiff_t); 354789857Sobrien // T* operator+(ptrdiff_t, T*); 354889857Sobrien // T& operator[](ptrdiff_t, T*); [BELOW] 354989857Sobrien // 355089857Sobrien // C++ [over.built]p14: 355189857Sobrien // 355289857Sobrien // For every T, where T is a pointer to object type, there 355389857Sobrien // exist candidate operator functions of the form 355489857Sobrien // 355589857Sobrien // ptrdiff_t operator-(T, T); 355689857Sobrien for (BuiltinCandidateTypeSet::iterator Ptr 355789857Sobrien = CandidateTypes.pointer_begin(); 355889857Sobrien Ptr != CandidateTypes.pointer_end(); ++Ptr) { 3559218822Sdim QualType ParamTypes[2] = { *Ptr, Context.getPointerDiffType() }; 3560218822Sdim 3561218822Sdim // operator+(T*, ptrdiff_t) or operator-(T*, ptrdiff_t) 3562218822Sdim AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); 3563218822Sdim 3564218822Sdim if (Op == OO_Plus) { 3565218822Sdim // T* operator+(ptrdiff_t, T*); 3566218822Sdim ParamTypes[0] = ParamTypes[1]; 3567218822Sdim ParamTypes[1] = *Ptr; 3568218822Sdim AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); 3569218822Sdim } else { 3570218822Sdim // ptrdiff_t operator-(T, T); 3571218822Sdim ParamTypes[1] = *Ptr; 3572218822Sdim AddBuiltinCandidate(Context.getPointerDiffType(), ParamTypes, 3573218822Sdim Args, 2, CandidateSet); 3574218822Sdim } 3575218822Sdim } 3576218822Sdim } 3577218822Sdim // Fall through 3578218822Sdim 3579218822Sdim case OO_Slash: 3580218822Sdim BinaryStar: 3581218822Sdim Conditional: 3582218822Sdim // C++ [over.built]p12: 3583218822Sdim // 3584218822Sdim // For every pair of promoted arithmetic types L and R, there 3585218822Sdim // exist candidate operator functions of the form 3586218822Sdim // 358789857Sobrien // LR operator*(L, R); 358889857Sobrien // LR operator/(L, R); 358989857Sobrien // LR operator+(L, R); 359089857Sobrien // LR operator-(L, R); 359189857Sobrien // bool operator<(L, R); 359289857Sobrien // bool operator>(L, R); 359389857Sobrien // bool operator<=(L, R); 359489857Sobrien // bool operator>=(L, R); 3595130561Sobrien // bool operator==(L, R); 359689857Sobrien // bool operator!=(L, R); 359789857Sobrien // 359889857Sobrien // where LR is the result of the usual arithmetic conversions 359989857Sobrien // between types L and R. 3600130561Sobrien // 360189857Sobrien // C++ [over.built]p24: 360289857Sobrien // 360389857Sobrien // For every pair of promoted arithmetic types L and R, there exist 3604218822Sdim // candidate operator functions of the form 3605218822Sdim // 360689857Sobrien // LR operator?(bool, L, R); 3607104834Sobrien // 360889857Sobrien // where LR is the result of the usual arithmetic conversions 360989857Sobrien // between types L and R. 361089857Sobrien // Our candidates ignore the first parameter. 3611104834Sobrien for (unsigned Left = FirstPromotedArithmeticType; 3612218822Sdim Left < LastPromotedArithmeticType; ++Left) { 3613218822Sdim for (unsigned Right = FirstPromotedArithmeticType; 3614104834Sobrien Right < LastPromotedArithmeticType; ++Right) { 3615104834Sobrien QualType LandR[2] = { ArithmeticTypes[Left], ArithmeticTypes[Right] }; 3616104834Sobrien QualType Result 3617218822Sdim = isComparison 3618218822Sdim ? Context.BoolTy 3619104834Sobrien : Context.UsualArithmeticConversionsType(LandR[0], LandR[1]); 3620104834Sobrien AddBuiltinCandidate(Result, LandR, Args, 2, CandidateSet); 3621130561Sobrien } 3622130561Sobrien } 3623130561Sobrien break; 3624130561Sobrien 3625218822Sdim case OO_Percent: 3626218822Sdim BinaryAmp: 3627218822Sdim case OO_Caret: 3628218822Sdim case OO_Pipe: 3629218822Sdim case OO_LessLess: 3630218822Sdim case OO_GreaterGreater: 3631218822Sdim // C++ [over.built]p17: 3632218822Sdim // 363389857Sobrien // For every pair of promoted integral types L and R, there 363489857Sobrien // exist candidate operator functions of the form 363589857Sobrien // 363689857Sobrien // LR operator%(L, R); 3637104834Sobrien // LR operator&(L, R); 3638104834Sobrien // LR operator^(L, R); 3639104834Sobrien // LR operator|(L, R); 3640130561Sobrien // L operator<<(L, R); 3641104834Sobrien // L operator>>(L, R); 3642104834Sobrien // 3643104834Sobrien // where LR is the result of the usual arithmetic conversions 3644104834Sobrien // between types L and R. 3645104834Sobrien for (unsigned Left = FirstPromotedIntegralType; 3646104834Sobrien Left < LastPromotedIntegralType; ++Left) { 3647104834Sobrien for (unsigned Right = FirstPromotedIntegralType; 3648104834Sobrien Right < LastPromotedIntegralType; ++Right) { 3649130561Sobrien QualType LandR[2] = { ArithmeticTypes[Left], ArithmeticTypes[Right] }; 3650130561Sobrien QualType Result = (Op == OO_LessLess || Op == OO_GreaterGreater) 3651130561Sobrien ? LandR[0] 3652130561Sobrien : Context.UsualArithmeticConversionsType(LandR[0], LandR[1]); 3653130561Sobrien AddBuiltinCandidate(Result, LandR, Args, 2, CandidateSet); 3654130561Sobrien } 3655130561Sobrien } 3656130561Sobrien break; 3657130561Sobrien 3658130561Sobrien case OO_Equal: 3659130561Sobrien // C++ [over.built]p20: 3660130561Sobrien // 3661130561Sobrien // For every pair (T, VQ), where T is an enumeration or 3662130561Sobrien // pointer to member type and VQ is either volatile or 3663130561Sobrien // empty, there exist candidate operator functions of the form 3664130561Sobrien // 3665130561Sobrien // VQ T& operator=(VQ T&, T); 3666104834Sobrien for (BuiltinCandidateTypeSet::iterator 3667104834Sobrien Enum = CandidateTypes.enumeration_begin(), 3668104834Sobrien EnumEnd = CandidateTypes.enumeration_end(); 3669130561Sobrien Enum != EnumEnd; ++Enum) 3670130561Sobrien AddBuiltinAssignmentOperatorCandidates(*this, *Enum, Args, 2, 3671130561Sobrien CandidateSet); 3672130561Sobrien for (BuiltinCandidateTypeSet::iterator 3673104834Sobrien MemPtr = CandidateTypes.member_pointer_begin(), 3674104834Sobrien MemPtrEnd = CandidateTypes.member_pointer_end(); 3675104834Sobrien MemPtr != MemPtrEnd; ++MemPtr) 3676104834Sobrien AddBuiltinAssignmentOperatorCandidates(*this, *MemPtr, Args, 2, 3677104834Sobrien CandidateSet); 3678104834Sobrien // Fall through. 3679104834Sobrien 3680104834Sobrien case OO_PlusEqual: 3681104834Sobrien case OO_MinusEqual: 3682104834Sobrien // C++ [over.built]p19: 3683104834Sobrien // 3684104834Sobrien // For every pair (T, VQ), where T is any type and VQ is either 3685104834Sobrien // volatile or empty, there exist candidate operator functions 3686218822Sdim // of the form 3687218822Sdim // 3688218822Sdim // T*VQ& operator=(T*VQ&, T*); 3689218822Sdim // 3690218822Sdim // C++ [over.built]p21: 3691218822Sdim // 3692218822Sdim // For every pair (T, VQ), where T is a cv-qualified or 3693104834Sobrien // cv-unqualified object type and VQ is either volatile or 3694104834Sobrien // empty, there exist candidate operator functions of the form 3695104834Sobrien // 3696130561Sobrien // T*VQ& operator+=(T*VQ&, ptrdiff_t); 3697104834Sobrien // T*VQ& operator-=(T*VQ&, ptrdiff_t); 3698218822Sdim for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); 3699218822Sdim Ptr != CandidateTypes.pointer_end(); ++Ptr) { 3700218822Sdim QualType ParamTypes[2]; 3701218822Sdim ParamTypes[1] = (Op == OO_Equal)? *Ptr : Context.getPointerDiffType(); 3702218822Sdim 3703218822Sdim // non-volatile version 3704218822Sdim ParamTypes[0] = Context.getLValueReferenceType(*Ptr); 3705218822Sdim AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet, 3706104834Sobrien /*IsAssigmentOperator=*/Op == OO_Equal); 3707218822Sdim 3708218822Sdim if (!Context.getCanonicalType(*Ptr).isVolatileQualified() && 3709104834Sobrien VisibleTypeConversionsQuals.hasVolatile()) { 3710104834Sobrien // volatile version 3711104834Sobrien ParamTypes[0] 3712104834Sobrien = Context.getLValueReferenceType(Context.getVolatileType(*Ptr)); 3713104834Sobrien AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet, 3714104834Sobrien /*IsAssigmentOperator=*/Op == OO_Equal); 3715104834Sobrien } 3716130561Sobrien } 3717130561Sobrien // Fall through. 3718218822Sdim 3719130561Sobrien case OO_StarEqual: 3720130561Sobrien case OO_SlashEqual: 3721104834Sobrien // C++ [over.built]p18: 3722104834Sobrien // 3723104834Sobrien // For every triple (L, VQ, R), where L is an arithmetic type, 3724104834Sobrien // VQ is either volatile or empty, and R is a promoted 3725104834Sobrien // arithmetic type, there exist candidate operator functions of 3726104834Sobrien // the form 3727104834Sobrien // 3728104834Sobrien // VQ L& operator=(VQ L&, R); 3729104834Sobrien // VQ L& operator*=(VQ L&, R); 3730104834Sobrien // VQ L& operator/=(VQ L&, R); 3731104834Sobrien // VQ L& operator+=(VQ L&, R); 3732218822Sdim // VQ L& operator-=(VQ L&, R); 3733218822Sdim for (unsigned Left = 0; Left < NumArithmeticTypes; ++Left) { 3734218822Sdim for (unsigned Right = FirstPromotedArithmeticType; 3735104834Sobrien Right < LastPromotedArithmeticType; ++Right) { 3736218822Sdim QualType ParamTypes[2]; 3737104834Sobrien ParamTypes[1] = ArithmeticTypes[Right]; 3738104834Sobrien 3739104834Sobrien // Add this built-in operator as a candidate (VQ is empty). 3740104834Sobrien ParamTypes[0] = Context.getLValueReferenceType(ArithmeticTypes[Left]); 3741104834Sobrien AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet, 3742104834Sobrien /*IsAssigmentOperator=*/Op == OO_Equal); 3743104834Sobrien 3744104834Sobrien // Add this built-in operator as a candidate (VQ is 'volatile'). 3745104834Sobrien if (VisibleTypeConversionsQuals.hasVolatile()) { 3746104834Sobrien ParamTypes[0] = Context.getVolatileType(ArithmeticTypes[Left]); 3747130561Sobrien ParamTypes[0] = Context.getLValueReferenceType(ParamTypes[0]); 3748104834Sobrien AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet, 3749218822Sdim /*IsAssigmentOperator=*/Op == OO_Equal); 3750104834Sobrien } 3751104834Sobrien } 3752104834Sobrien } 3753104834Sobrien break; 3754104834Sobrien 3755104834Sobrien case OO_PercentEqual: 3756104834Sobrien case OO_LessLessEqual: 3757104834Sobrien case OO_GreaterGreaterEqual: 3758104834Sobrien case OO_AmpEqual: 3759104834Sobrien case OO_CaretEqual: 3760104834Sobrien case OO_PipeEqual: 3761130561Sobrien // C++ [over.built]p22: 3762130561Sobrien // 3763130561Sobrien // For every triple (L, VQ, R), where L is an integral type, VQ 3764104834Sobrien // is either volatile or empty, and R is a promoted integral 3765104834Sobrien // type, there exist candidate operator functions of the form 3766104834Sobrien // 3767104834Sobrien // VQ L& operator%=(VQ L&, R); 3768104834Sobrien // VQ L& operator<<=(VQ L&, R); 3769104834Sobrien // VQ L& operator>>=(VQ L&, R); 3770104834Sobrien // VQ L& operator&=(VQ L&, R); 3771104834Sobrien // VQ L& operator^=(VQ L&, R); 3772104834Sobrien // VQ L& operator|=(VQ L&, R); 3773104834Sobrien for (unsigned Left = FirstIntegralType; Left < LastIntegralType; ++Left) { 3774104834Sobrien for (unsigned Right = FirstPromotedIntegralType; 3775104834Sobrien Right < LastPromotedIntegralType; ++Right) { 3776104834Sobrien QualType ParamTypes[2]; 3777104834Sobrien ParamTypes[1] = ArithmeticTypes[Right]; 3778104834Sobrien 3779104834Sobrien // Add this built-in operator as a candidate (VQ is empty). 3780104834Sobrien ParamTypes[0] = Context.getLValueReferenceType(ArithmeticTypes[Left]); 3781104834Sobrien AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); 3782104834Sobrien if (VisibleTypeConversionsQuals.hasVolatile()) { 3783104834Sobrien // Add this built-in operator as a candidate (VQ is 'volatile'). 3784104834Sobrien ParamTypes[0] = ArithmeticTypes[Left]; 3785104834Sobrien ParamTypes[0] = Context.getVolatileType(ParamTypes[0]); 3786104834Sobrien ParamTypes[0] = Context.getLValueReferenceType(ParamTypes[0]); 3787104834Sobrien AddBuiltinCandidate(ParamTypes[0], ParamTypes, Args, 2, CandidateSet); 3788104834Sobrien } 3789104834Sobrien } 3790104834Sobrien } 3791104834Sobrien break; 3792104834Sobrien 3793104834Sobrien case OO_Exclaim: { 3794104834Sobrien // C++ [over.operator]p23: 3795104834Sobrien // 3796104834Sobrien // There also exist candidate operator functions of the form 3797104834Sobrien // 3798130561Sobrien // bool operator!(bool); 3799104834Sobrien // bool operator&&(bool, bool); [BELOW] 3800104834Sobrien // bool operator||(bool, bool); [BELOW] 3801218822Sdim QualType ParamTy = Context.BoolTy; 3802218822Sdim AddBuiltinCandidate(ParamTy, &ParamTy, Args, 1, CandidateSet, 3803104834Sobrien /*IsAssignmentOperator=*/false, 3804104834Sobrien /*NumContextualBoolArguments=*/1); 3805104834Sobrien break; 3806104834Sobrien } 3807104834Sobrien 3808104834Sobrien case OO_AmpAmp: 3809104834Sobrien case OO_PipePipe: { 3810104834Sobrien // C++ [over.operator]p23: 3811104834Sobrien // 381292828Sobrien // There also exist candidate operator functions of the form 381392828Sobrien // 3814130561Sobrien // bool operator!(bool); [ABOVE] 3815130561Sobrien // bool operator&&(bool, bool); 381692828Sobrien // bool operator||(bool, bool); 381792828Sobrien QualType ParamTypes[2] = { Context.BoolTy, Context.BoolTy }; 381892828Sobrien AddBuiltinCandidate(Context.BoolTy, ParamTypes, Args, 2, CandidateSet, 381992828Sobrien /*IsAssignmentOperator=*/false, 382092828Sobrien /*NumContextualBoolArguments=*/2); 382192828Sobrien break; 382292828Sobrien } 382392828Sobrien 382492828Sobrien case OO_Subscript: 3825218822Sdim // C++ [over.built]p13: 3826218822Sdim // 382792828Sobrien // For every cv-qualified or cv-unqualified object type T there 382892828Sobrien // exist candidate operator functions of the form 3829130561Sobrien // 383092828Sobrien // T* operator+(T*, ptrdiff_t); [ABOVE] 3831104834Sobrien // T& operator[](T*, ptrdiff_t); 3832218822Sdim // T* operator-(T*, ptrdiff_t); [ABOVE] 3833218822Sdim // T* operator+(ptrdiff_t, T*); [ABOVE] 3834130561Sobrien // T& operator[](ptrdiff_t, T*); 3835218822Sdim for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(); 3836130561Sobrien Ptr != CandidateTypes.pointer_end(); ++Ptr) { 383792828Sobrien QualType ParamTypes[2] = { *Ptr, Context.getPointerDiffType() }; 3838218822Sdim QualType PointeeType = (*Ptr)->getAs<PointerType>()->getPointeeType(); 3839104834Sobrien QualType ResultTy = Context.getLValueReferenceType(PointeeType); 3840104834Sobrien 3841218822Sdim // T& operator[](T*, ptrdiff_t) 3842218822Sdim AddBuiltinCandidate(ResultTy, ParamTypes, Args, 2, CandidateSet); 3843130561Sobrien 3844130561Sobrien // T& operator[](ptrdiff_t, T*); 3845130561Sobrien ParamTypes[0] = ParamTypes[1]; 3846104834Sobrien ParamTypes[1] = *Ptr; 3847218822Sdim AddBuiltinCandidate(ResultTy, ParamTypes, Args, 2, CandidateSet); 3848218822Sdim } 3849218822Sdim break; 3850218822Sdim 3851218822Sdim case OO_ArrowStar: 3852218822Sdim // C++ [over.built]p11: 3853218822Sdim // For every quintuple (C1, C2, T, CV1, CV2), where C2 is a class type, 3854218822Sdim // C1 is the same type as C2 or is a derived class of C2, T is an object 3855218822Sdim // type or a function type, and CV1 and CV2 are cv-qualifier-seqs, 3856218822Sdim // there exist candidate operator functions of the form 3857218822Sdim // CV12 T& operator->*(CV1 C1*, CV2 T C2::*); 3858218822Sdim // where CV12 is the union of CV1 and CV2. 3859130561Sobrien { 386092828Sobrien for (BuiltinCandidateTypeSet::iterator Ptr = 386192828Sobrien CandidateTypes.pointer_begin(); 3862130561Sobrien Ptr != CandidateTypes.pointer_end(); ++Ptr) { 3863130561Sobrien QualType C1Ty = (*Ptr); 386489857Sobrien QualType C1; 3865130561Sobrien QualifierCollector Q1; 3866130561Sobrien if (const PointerType *PointerTy = C1Ty->getAs<PointerType>()) { 386789857Sobrien C1 = QualType(Q1.strip(PointerTy->getPointeeType()), 0); 3868130561Sobrien if (!isa<RecordType>(C1)) 3869130561Sobrien continue; 3870130561Sobrien // heuristic to reduce number of builtin candidates in the set. 387189857Sobrien // Add volatile/restrict version only if there are conversions to a 3872130561Sobrien // volatile/restrict type. 3873130561Sobrien if (!VisibleTypeConversionsQuals.hasVolatile() && Q1.hasVolatile()) 3874130561Sobrien continue; 3875130561Sobrien if (!VisibleTypeConversionsQuals.hasRestrict() && Q1.hasRestrict()) 387689857Sobrien continue; 3877130561Sobrien } 3878130561Sobrien for (BuiltinCandidateTypeSet::iterator 3879130561Sobrien MemPtr = CandidateTypes.member_pointer_begin(), 3880130561Sobrien MemPtrEnd = CandidateTypes.member_pointer_end(); 388189857Sobrien MemPtr != MemPtrEnd; ++MemPtr) { 3882130561Sobrien const MemberPointerType *mptr = cast<MemberPointerType>(*MemPtr); 3883130561Sobrien QualType C2 = QualType(mptr->getClass(), 0); 3884130561Sobrien C2 = C2.getUnqualifiedType(); 3885218822Sdim if (C1 != C2 && !IsDerivedFrom(C1, C2)) 3886130561Sobrien break; 3887130561Sobrien QualType ParamTypes[2] = { *Ptr, *MemPtr }; 3888130561Sobrien // build CV12 T& 3889130561Sobrien QualType T = mptr->getPointeeType(); 3890218822Sdim if (!VisibleTypeConversionsQuals.hasVolatile() && 3891218822Sdim T.isVolatileQualified()) 3892130561Sobrien continue; 3893130561Sobrien if (!VisibleTypeConversionsQuals.hasRestrict() && 3894130561Sobrien T.isRestrictQualified()) 3895130561Sobrien continue; 3896130561Sobrien T = Q1.apply(T); 3897130561Sobrien QualType ResultTy = Context.getLValueReferenceType(T); 3898130561Sobrien AddBuiltinCandidate(ResultTy, ParamTypes, Args, 2, CandidateSet); 389989857Sobrien } 390089857Sobrien } 390192828Sobrien } 390289857Sobrien break; 3903130561Sobrien 3904130561Sobrien case OO_Conditional: 390589857Sobrien // Note that we don't consider the first argument, since it has been 390689857Sobrien // contextually converted to bool long ago. The candidates below are 390789857Sobrien // therefore added as binary. 390889857Sobrien // 3909130561Sobrien // C++ [over.built]p24: 391089857Sobrien // For every type T, where T is a pointer or pointer-to-member type, 3911130561Sobrien // there exist candidate operator functions of the form 3912130561Sobrien // 3913130561Sobrien // T operator?(bool, T, T); 3914130561Sobrien // 3915130561Sobrien for (BuiltinCandidateTypeSet::iterator Ptr = CandidateTypes.pointer_begin(), 3916130561Sobrien E = CandidateTypes.pointer_end(); Ptr != E; ++Ptr) { 391789857Sobrien QualType ParamTypes[2] = { *Ptr, *Ptr }; 3918130561Sobrien AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); 391989857Sobrien } 3920130561Sobrien for (BuiltinCandidateTypeSet::iterator Ptr = 3921130561Sobrien CandidateTypes.member_pointer_begin(), 392289857Sobrien E = CandidateTypes.member_pointer_end(); Ptr != E; ++Ptr) { 392389857Sobrien QualType ParamTypes[2] = { *Ptr, *Ptr }; 3924130561Sobrien AddBuiltinCandidate(*Ptr, ParamTypes, Args, 2, CandidateSet); 392589857Sobrien } 392689857Sobrien goto Conditional; 3927218822Sdim } 3928218822Sdim} 3929218822Sdim 3930218822Sdim/// \brief Add function candidates found via argument-dependent lookup 3931218822Sdim/// to the set of overloading candidates. 3932218822Sdim/// 3933218822Sdim/// This routine performs argument-dependent name lookup based on the 3934218822Sdim/// given function name (which may also be an operator name) and adds 3935218822Sdim/// all of the overload candidates found by ADL to the overload 3936218822Sdim/// candidate set (C++ [basic.lookup.argdep]). 3937218822Sdimvoid 3938218822SdimSema::AddArgumentDependentLookupCandidates(DeclarationName Name, 3939218822Sdim Expr **Args, unsigned NumArgs, 3940218822Sdim bool HasExplicitTemplateArgs, 3941218822Sdim const TemplateArgumentLoc *ExplicitTemplateArgs, 3942218822Sdim unsigned NumExplicitTemplateArgs, 3943218822Sdim OverloadCandidateSet& CandidateSet, 3944218822Sdim bool PartialOverloading) { 3945218822Sdim FunctionSet Functions; 3946218822Sdim 3947218822Sdim // FIXME: Should we be trafficking in canonical function decls throughout? 3948218822Sdim 3949218822Sdim // Record all of the function candidates that we've already 3950218822Sdim // added to the overload set, so that we don't add those same 3951218822Sdim // candidates a second time. 3952218822Sdim for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(), 3953218822Sdim CandEnd = CandidateSet.end(); 3954218822Sdim Cand != CandEnd; ++Cand) 3955218822Sdim if (Cand->Function) { 3956218822Sdim Functions.insert(Cand->Function); 3957218822Sdim if (FunctionTemplateDecl *FunTmpl = Cand->Function->getPrimaryTemplate()) 3958218822Sdim Functions.insert(FunTmpl); 3959218822Sdim } 3960218822Sdim 3961218822Sdim // FIXME: Pass in the explicit template arguments? 396289857Sobrien ArgumentDependentLookup(Name, /*Operator*/false, Args, NumArgs, Functions); 396389857Sobrien 396489857Sobrien // Erase all of the candidates we already knew about. 3965218822Sdim // FIXME: This is suboptimal. Is there a better way? 3966218822Sdim for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(), 3967218822Sdim CandEnd = CandidateSet.end(); 396889857Sobrien Cand != CandEnd; ++Cand) 396989857Sobrien if (Cand->Function) { 397089857Sobrien Functions.erase(Cand->Function); 397189857Sobrien if (FunctionTemplateDecl *FunTmpl = Cand->Function->getPrimaryTemplate()) 397289857Sobrien Functions.erase(FunTmpl); 397389857Sobrien } 3974130561Sobrien 397589857Sobrien // For each of the ADL candidates we found, add it to the overload 397689857Sobrien // set. 397789857Sobrien for (FunctionSet::iterator Func = Functions.begin(), 397889857Sobrien FuncEnd = Functions.end(); 397989857Sobrien Func != FuncEnd; ++Func) { 398089857Sobrien if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) { 398189857Sobrien if (HasExplicitTemplateArgs) 3982218822Sdim continue; 398389857Sobrien 398489857Sobrien AddOverloadCandidate(FD, Args, NumArgs, CandidateSet, 398589857Sobrien false, false, PartialOverloading); 398689857Sobrien } else 398789857Sobrien AddTemplateOverloadCandidate(cast<FunctionTemplateDecl>(*Func), 398889857Sobrien HasExplicitTemplateArgs, 398989857Sobrien ExplicitTemplateArgs, 399089857Sobrien NumExplicitTemplateArgs, 399189857Sobrien Args, NumArgs, CandidateSet); 399289857Sobrien } 399389857Sobrien} 399489857Sobrien 399589857Sobrien/// isBetterOverloadCandidate - Determines whether the first overload 399689857Sobrien/// candidate is a better candidate than the second (C++ 13.3.3p1). 399789857Sobrienbool 399889857SobrienSema::isBetterOverloadCandidate(const OverloadCandidate& Cand1, 399989857Sobrien const OverloadCandidate& Cand2) { 400089857Sobrien // Define viable functions to be better candidates than non-viable 400189857Sobrien // functions. 400289857Sobrien if (!Cand2.Viable) 400389857Sobrien return Cand1.Viable; 400489857Sobrien else if (!Cand1.Viable) 400589857Sobrien return false; 400689857Sobrien 400789857Sobrien // C++ [over.match.best]p1: 4008130561Sobrien // 400989857Sobrien // -- if F is a static member function, ICS1(F) is defined such 4010130561Sobrien // that ICS1(F) is neither better nor worse than ICS1(G) for 4011218822Sdim // any function G, and, symmetrically, ICS1(G) is neither 4012130561Sobrien // better nor worse than ICS1(F). 4013218822Sdim unsigned StartArg = 0; 4014218822Sdim if (Cand1.IgnoreObjectArgument || Cand2.IgnoreObjectArgument) 4015218822Sdim StartArg = 1; 4016218822Sdim 4017130561Sobrien // C++ [over.match.best]p1: 4018218822Sdim // A viable function F1 is defined to be a better function than another 4019218822Sdim // viable function F2 if for all arguments i, ICSi(F1) is not a worse 4020218822Sdim // conversion sequence than ICSi(F2), and then... 4021218822Sdim unsigned NumArgs = Cand1.Conversions.size(); 4022130561Sobrien assert(Cand2.Conversions.size() == NumArgs && "Overload candidate mismatch"); 4023130561Sobrien bool HasBetterConversion = false; 4024130561Sobrien for (unsigned ArgIdx = StartArg; ArgIdx < NumArgs; ++ArgIdx) { 4025130561Sobrien switch (CompareImplicitConversionSequences(Cand1.Conversions[ArgIdx], 4026130561Sobrien Cand2.Conversions[ArgIdx])) { 4027130561Sobrien case ImplicitConversionSequence::Better: 4028130561Sobrien // Cand1 has a better conversion sequence. 4029130561Sobrien HasBetterConversion = true; 4030130561Sobrien break; 4031130561Sobrien 4032130561Sobrien case ImplicitConversionSequence::Worse: 4033130561Sobrien // Cand1 can't be better than Cand2. 4034130561Sobrien return false; 4035130561Sobrien 4036130561Sobrien case ImplicitConversionSequence::Indistinguishable: 4037130561Sobrien // Do nothing. 4038130561Sobrien break; 4039130561Sobrien } 4040130561Sobrien } 4041130561Sobrien 4042130561Sobrien // -- for some argument j, ICSj(F1) is a better conversion sequence than 4043130561Sobrien // ICSj(F2), or, if not that, 4044130561Sobrien if (HasBetterConversion) 4045130561Sobrien return true; 4046130561Sobrien 4047130561Sobrien // - F1 is a non-template function and F2 is a function template 4048130561Sobrien // specialization, or, if not that, 4049130561Sobrien if (Cand1.Function && !Cand1.Function->getPrimaryTemplate() && 4050130561Sobrien Cand2.Function && Cand2.Function->getPrimaryTemplate()) 4051130561Sobrien return true; 4052130561Sobrien 4053130561Sobrien // -- F1 and F2 are function template specializations, and the function 4054130561Sobrien // template for F1 is more specialized than the template for F2 4055130561Sobrien // according to the partial ordering rules described in 14.5.5.2, or, 4056130561Sobrien // if not that, 4057130561Sobrien if (Cand1.Function && Cand1.Function->getPrimaryTemplate() && 4058130561Sobrien Cand2.Function && Cand2.Function->getPrimaryTemplate()) 4059130561Sobrien if (FunctionTemplateDecl *BetterTemplate 4060218822Sdim = getMoreSpecializedTemplate(Cand1.Function->getPrimaryTemplate(), 4061130561Sobrien Cand2.Function->getPrimaryTemplate(), 4062218822Sdim isa<CXXConversionDecl>(Cand1.Function)? TPOC_Conversion 4063130561Sobrien : TPOC_Call)) 4064218822Sdim return BetterTemplate == Cand1.Function->getPrimaryTemplate(); 4065218822Sdim 4066218822Sdim // -- the context is an initialization by user-defined conversion 4067130561Sobrien // (see 8.5, 13.3.1.5) and the standard conversion sequence 4068130561Sobrien // from the return type of F1 to the destination type (i.e., 4069130561Sobrien // the type of the entity being initialized) is a better 4070130561Sobrien // conversion sequence than the standard conversion sequence 4071130561Sobrien // from the return type of F2 to the destination type. 407289857Sobrien if (Cand1.Function && Cand2.Function && 407389857Sobrien isa<CXXConversionDecl>(Cand1.Function) && 4074218822Sdim isa<CXXConversionDecl>(Cand2.Function)) { 4075218822Sdim switch (CompareStandardConversionSequences(Cand1.FinalConversion, 4076104834Sobrien Cand2.FinalConversion)) { 4077218822Sdim case ImplicitConversionSequence::Better: 4078218822Sdim // Cand1 has a better conversion sequence. 4079104834Sobrien return true; 4080218822Sdim 4081104834Sobrien case ImplicitConversionSequence::Worse: 4082218822Sdim // Cand1 can't be better than Cand2. 4083104834Sobrien return false; 4084218822Sdim 4085104834Sobrien case ImplicitConversionSequence::Indistinguishable: 4086218822Sdim // Do nothing 4087218822Sdim break; 4088218822Sdim } 4089218822Sdim } 4090218822Sdim 4091218822Sdim return false; 4092218822Sdim} 4093218822Sdim 4094218822Sdim/// \brief Computes the best viable function (C++ 13.3.3) 4095104834Sobrien/// within an overload candidate set. 4096218822Sdim/// 4097218822Sdim/// \param CandidateSet the set of candidate functions. 4098104834Sobrien/// 4099104834Sobrien/// \param Loc the location of the function name (or operator symbol) for 4100218822Sdim/// which overload resolution occurs. 4101130561Sobrien/// 4102218822Sdim/// \param Best f overload resolution was successful or found a deleted 4103218822Sdim/// function, Best points to the candidate function found. 4104218822Sdim/// 4105218822Sdim/// \returns The result of overload resolution. 4106218822SdimSema::OverloadingResult 4107218822SdimSema::BestViableFunction(OverloadCandidateSet& CandidateSet, 4108218822Sdim SourceLocation Loc, 4109218822Sdim OverloadCandidateSet::iterator& Best) { 4110218822Sdim // Find the best viable function. 4111218822Sdim Best = CandidateSet.end(); 4112218822Sdim for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4113218822Sdim Cand != CandidateSet.end(); ++Cand) { 4114218822Sdim if (Cand->Viable) { 4115218822Sdim if (Best == CandidateSet.end() || isBetterOverloadCandidate(*Cand, *Best)) 4116218822Sdim Best = Cand; 4117218822Sdim } 4118218822Sdim } 4119218822Sdim 4120218822Sdim // If we didn't find any viable functions, abort. 4121218822Sdim if (Best == CandidateSet.end()) 4122218822Sdim return OR_No_Viable_Function; 4123218822Sdim 4124218822Sdim // Make sure that this function is better than every other viable 4125218822Sdim // function. If not, we have an ambiguity. 4126218822Sdim for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4127218822Sdim Cand != CandidateSet.end(); ++Cand) { 4128218822Sdim if (Cand->Viable && 4129218822Sdim Cand != Best && 4130218822Sdim !isBetterOverloadCandidate(*Best, *Cand)) { 4131218822Sdim Best = CandidateSet.end(); 4132218822Sdim return OR_Ambiguous; 4133218822Sdim } 4134218822Sdim } 4135218822Sdim 4136218822Sdim // Best is the best viable function. 4137218822Sdim if (Best->Function && 4138130561Sobrien (Best->Function->isDeleted() || 4139130561Sobrien Best->Function->getAttr<UnavailableAttr>())) 4140130561Sobrien return OR_Deleted; 4141130561Sobrien 4142130561Sobrien // C++ [basic.def.odr]p2: 4143130561Sobrien // An overloaded function is used if it is selected by overload resolution 4144130561Sobrien // when referred to from a potentially-evaluated expression. [Note: this 4145130561Sobrien // covers calls to named functions (5.2.2), operator overloading 4146130561Sobrien // (clause 13), user-defined conversions (12.3.2), allocation function for 4147218822Sdim // placement new (5.3.4), as well as non-default initialization (8.5). 4148218822Sdim if (Best->Function) 4149130561Sobrien MarkDeclarationReferenced(Loc, Best->Function); 4150218822Sdim return OR_Success; 4151130561Sobrien} 4152130561Sobrien 4153130561Sobrien/// PrintOverloadCandidates - When overload resolution fails, prints 4154218822Sdim/// diagnostic messages containing the candidates in the candidate 4155218822Sdim/// set. If OnlyViable is true, only viable candidates will be printed. 4156218822Sdimvoid 4157218822SdimSema::PrintOverloadCandidates(OverloadCandidateSet& CandidateSet, 4158218822Sdim bool OnlyViable, 4159218822Sdim const char *Opc, 4160218822Sdim SourceLocation OpLoc) { 4161218822Sdim OverloadCandidateSet::iterator Cand = CandidateSet.begin(), 4162218822Sdim LastCand = CandidateSet.end(); 4163218822Sdim bool Reported = false; 4164218822Sdim for (; Cand != LastCand; ++Cand) { 4165218822Sdim if (Cand->Viable || !OnlyViable) { 4166218822Sdim if (Cand->Function) { 4167218822Sdim if (Cand->Function->isDeleted() || 4168218822Sdim Cand->Function->getAttr<UnavailableAttr>()) { 4169218822Sdim // Deleted or "unavailable" function. 4170218822Sdim Diag(Cand->Function->getLocation(), diag::err_ovl_candidate_deleted) 4171218822Sdim << Cand->Function->isDeleted(); 4172218822Sdim } else if (FunctionTemplateDecl *FunTmpl 4173218822Sdim = Cand->Function->getPrimaryTemplate()) { 4174218822Sdim // Function template specialization 4175218822Sdim // FIXME: Give a better reason! 4176218822Sdim Diag(Cand->Function->getLocation(), diag::err_ovl_template_candidate) 4177218822Sdim << getTemplateArgumentBindingsText(FunTmpl->getTemplateParameters(), 4178218822Sdim *Cand->Function->getTemplateSpecializationArgs()); 4179218822Sdim } else { 4180218822Sdim // Normal function 4181218822Sdim bool errReported = false; 4182218822Sdim if (!Cand->Viable && Cand->Conversions.size() > 0) { 4183218822Sdim for (int i = Cand->Conversions.size()-1; i >= 0; i--) { 4184218822Sdim const ImplicitConversionSequence &Conversion = 4185218822Sdim Cand->Conversions[i]; 4186218822Sdim if ((Conversion.ConversionKind != 4187218822Sdim ImplicitConversionSequence::BadConversion) || 4188218822Sdim Conversion.ConversionFunctionSet.size() == 0) 4189218822Sdim continue; 4190218822Sdim Diag(Cand->Function->getLocation(), 4191218822Sdim diag::err_ovl_candidate_not_viable) << (i+1); 4192218822Sdim errReported = true; 4193218822Sdim for (int j = Conversion.ConversionFunctionSet.size()-1; 4194218822Sdim j >= 0; j--) { 4195218822Sdim FunctionDecl *Func = Conversion.ConversionFunctionSet[j]; 4196218822Sdim Diag(Func->getLocation(), diag::err_ovl_candidate); 4197218822Sdim } 4198218822Sdim } 4199130561Sobrien } 4200218822Sdim if (!errReported) 4201218822Sdim Diag(Cand->Function->getLocation(), diag::err_ovl_candidate); 4202218822Sdim } 4203218822Sdim } else if (Cand->IsSurrogate) { 4204218822Sdim // Desugar the type of the surrogate down to a function type, 4205218822Sdim // retaining as many typedefs as possible while still showing 4206218822Sdim // the function type (and, therefore, its parameter types). 4207218822Sdim QualType FnType = Cand->Surrogate->getConversionType(); 4208218822Sdim bool isLValueReference = false; 4209218822Sdim bool isRValueReference = false; 4210218822Sdim bool isPointer = false; 4211218822Sdim if (const LValueReferenceType *FnTypeRef = 4212218822Sdim FnType->getAs<LValueReferenceType>()) { 4213218822Sdim FnType = FnTypeRef->getPointeeType(); 4214218822Sdim isLValueReference = true; 4215218822Sdim } else if (const RValueReferenceType *FnTypeRef = 4216218822Sdim FnType->getAs<RValueReferenceType>()) { 4217218822Sdim FnType = FnTypeRef->getPointeeType(); 4218218822Sdim isRValueReference = true; 4219218822Sdim } 4220218822Sdim if (const PointerType *FnTypePtr = FnType->getAs<PointerType>()) { 4221218822Sdim FnType = FnTypePtr->getPointeeType(); 4222218822Sdim isPointer = true; 4223218822Sdim } 4224218822Sdim // Desugar down to a function type. 4225218822Sdim FnType = QualType(FnType->getAs<FunctionType>(), 0); 4226218822Sdim // Reconstruct the pointer/reference as appropriate. 4227218822Sdim if (isPointer) FnType = Context.getPointerType(FnType); 4228218822Sdim if (isRValueReference) FnType = Context.getRValueReferenceType(FnType); 4229218822Sdim if (isLValueReference) FnType = Context.getLValueReferenceType(FnType); 4230218822Sdim 4231218822Sdim Diag(Cand->Surrogate->getLocation(), diag::err_ovl_surrogate_cand) 4232218822Sdim << FnType; 4233218822Sdim } else if (OnlyViable) { 4234218822Sdim assert(Cand->Conversions.size() <= 2 && 4235218822Sdim "builtin-binary-operator-not-binary"); 4236218822Sdim std::string TypeStr("operator"); 4237218822Sdim TypeStr += Opc; 4238218822Sdim TypeStr += "("; 4239218822Sdim TypeStr += Cand->BuiltinTypes.ParamTypes[0].getAsString(); 4240218822Sdim if (Cand->Conversions.size() == 1) { 4241218822Sdim TypeStr += ")"; 4242218822Sdim Diag(OpLoc, diag::err_ovl_builtin_unary_candidate) << TypeStr; 4243218822Sdim } 4244218822Sdim else { 4245218822Sdim TypeStr += ", "; 4246218822Sdim TypeStr += Cand->BuiltinTypes.ParamTypes[1].getAsString(); 4247218822Sdim TypeStr += ")"; 4248218822Sdim Diag(OpLoc, diag::err_ovl_builtin_binary_candidate) << TypeStr; 4249218822Sdim } 4250218822Sdim } 4251218822Sdim else if (!Cand->Viable && !Reported) { 4252218822Sdim // Non-viability might be due to ambiguous user-defined conversions, 4253218822Sdim // needed for built-in operators. Report them as well, but only once 4254218822Sdim // as we have typically many built-in candidates. 4255218822Sdim unsigned NoOperands = Cand->Conversions.size(); 4256218822Sdim for (unsigned ArgIdx = 0; ArgIdx < NoOperands; ++ArgIdx) { 4257218822Sdim const ImplicitConversionSequence &ICS = Cand->Conversions[ArgIdx]; 4258218822Sdim if (ICS.ConversionKind != ImplicitConversionSequence::BadConversion || 4259218822Sdim ICS.ConversionFunctionSet.empty()) 4260218822Sdim continue; 4261218822Sdim if (CXXConversionDecl *Func = dyn_cast<CXXConversionDecl>( 4262218822Sdim Cand->Conversions[ArgIdx].ConversionFunctionSet[0])) { 4263218822Sdim QualType FromTy = 4264218822Sdim QualType( 4265218822Sdim static_cast<Type*>(ICS.UserDefined.Before.FromTypePtr),0); 4266218822Sdim Diag(OpLoc,diag::note_ambiguous_type_conversion) 4267218822Sdim << FromTy << Func->getConversionType(); 4268218822Sdim } 4269218822Sdim for (unsigned j = 0; j < ICS.ConversionFunctionSet.size(); j++) { 4270218822Sdim FunctionDecl *Func = 4271218822Sdim Cand->Conversions[ArgIdx].ConversionFunctionSet[j]; 4272218822Sdim Diag(Func->getLocation(),diag::err_ovl_candidate); 4273218822Sdim } 4274218822Sdim } 4275218822Sdim Reported = true; 4276218822Sdim } 4277218822Sdim } 4278218822Sdim } 4279218822Sdim} 4280218822Sdim 4281218822Sdim/// ResolveAddressOfOverloadedFunction - Try to resolve the address of 4282218822Sdim/// an overloaded function (C++ [over.over]), where @p From is an 4283218822Sdim/// expression with overloaded function type and @p ToType is the type 4284218822Sdim/// we're trying to resolve to. For example: 4285218822Sdim/// 4286218822Sdim/// @code 4287218822Sdim/// int f(double); 4288218822Sdim/// int f(int); 4289218822Sdim/// 4290218822Sdim/// int (*pfd)(double) = f; // selects f(double) 4291218822Sdim/// @endcode 4292218822Sdim/// 4293218822Sdim/// This routine returns the resulting FunctionDecl if it could be 4294218822Sdim/// resolved, and NULL otherwise. When @p Complain is true, this 4295218822Sdim/// routine will emit diagnostics if there is an error. 4296218822SdimFunctionDecl * 4297218822SdimSema::ResolveAddressOfOverloadedFunction(Expr *From, QualType ToType, 4298218822Sdim bool Complain) { 4299218822Sdim QualType FunctionType = ToType; 4300218822Sdim bool IsMember = false; 4301218822Sdim if (const PointerType *ToTypePtr = ToType->getAs<PointerType>()) 4302218822Sdim FunctionType = ToTypePtr->getPointeeType(); 4303218822Sdim else if (const ReferenceType *ToTypeRef = ToType->getAs<ReferenceType>()) 4304218822Sdim FunctionType = ToTypeRef->getPointeeType(); 4305218822Sdim else if (const MemberPointerType *MemTypePtr = 4306218822Sdim ToType->getAs<MemberPointerType>()) { 4307130561Sobrien FunctionType = MemTypePtr->getPointeeType(); 4308130561Sobrien IsMember = true; 4309130561Sobrien } 4310130561Sobrien 4311130561Sobrien // We only look at pointers or references to functions. 4312130561Sobrien FunctionType = Context.getCanonicalType(FunctionType).getUnqualifiedType(); 4313130561Sobrien if (!FunctionType->isFunctionType()) 4314130561Sobrien return 0; 4315130561Sobrien 4316130561Sobrien // Find the actual overloaded function declaration. 4317130561Sobrien OverloadedFunctionDecl *Ovl = 0; 4318130561Sobrien 4319130561Sobrien // C++ [over.over]p1: 4320130561Sobrien // [...] [Note: any redundant set of parentheses surrounding the 4321130561Sobrien // overloaded function name is ignored (5.1). ] 4322130561Sobrien Expr *OvlExpr = From->IgnoreParens(); 4323130561Sobrien 4324130561Sobrien // C++ [over.over]p1: 4325130561Sobrien // [...] The overloaded function name can be preceded by the & 4326130561Sobrien // operator. 4327130561Sobrien if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(OvlExpr)) { 4328130561Sobrien if (UnOp->getOpcode() == UnaryOperator::AddrOf) 4329130561Sobrien OvlExpr = UnOp->getSubExpr()->IgnoreParens(); 4330130561Sobrien } 4331130561Sobrien 4332130561Sobrien bool HasExplicitTemplateArgs = false; 4333130561Sobrien const TemplateArgumentLoc *ExplicitTemplateArgs = 0; 4334130561Sobrien unsigned NumExplicitTemplateArgs = 0; 4335130561Sobrien 4336130561Sobrien // Try to dig out the overloaded function. 4337130561Sobrien FunctionTemplateDecl *FunctionTemplate = 0; 4338130561Sobrien if (DeclRefExpr *DR = dyn_cast<DeclRefExpr>(OvlExpr)) { 4339130561Sobrien Ovl = dyn_cast<OverloadedFunctionDecl>(DR->getDecl()); 4340130561Sobrien FunctionTemplate = dyn_cast<FunctionTemplateDecl>(DR->getDecl()); 4341130561Sobrien HasExplicitTemplateArgs = DR->hasExplicitTemplateArgumentList(); 4342130561Sobrien ExplicitTemplateArgs = DR->getTemplateArgs(); 4343130561Sobrien NumExplicitTemplateArgs = DR->getNumTemplateArgs(); 4344130561Sobrien } else if (MemberExpr *ME = dyn_cast<MemberExpr>(OvlExpr)) { 4345130561Sobrien Ovl = dyn_cast<OverloadedFunctionDecl>(ME->getMemberDecl()); 4346130561Sobrien FunctionTemplate = dyn_cast<FunctionTemplateDecl>(ME->getMemberDecl()); 4347130561Sobrien HasExplicitTemplateArgs = ME->hasExplicitTemplateArgumentList(); 4348130561Sobrien ExplicitTemplateArgs = ME->getTemplateArgs(); 4349130561Sobrien NumExplicitTemplateArgs = ME->getNumTemplateArgs(); 4350130561Sobrien } else if (TemplateIdRefExpr *TIRE = dyn_cast<TemplateIdRefExpr>(OvlExpr)) { 4351130561Sobrien TemplateName Name = TIRE->getTemplateName(); 4352130561Sobrien Ovl = Name.getAsOverloadedFunctionDecl(); 4353130561Sobrien FunctionTemplate = 4354130561Sobrien dyn_cast_or_null<FunctionTemplateDecl>(Name.getAsTemplateDecl()); 4355130561Sobrien 4356130561Sobrien HasExplicitTemplateArgs = true; 4357130561Sobrien ExplicitTemplateArgs = TIRE->getTemplateArgs(); 4358130561Sobrien NumExplicitTemplateArgs = TIRE->getNumTemplateArgs(); 4359130561Sobrien } 4360130561Sobrien 4361130561Sobrien // If there's no overloaded function declaration or function template, 4362130561Sobrien // we're done. 4363130561Sobrien if (!Ovl && !FunctionTemplate) 4364130561Sobrien return 0; 4365130561Sobrien 4366130561Sobrien OverloadIterator Fun; 4367130561Sobrien if (Ovl) 4368130561Sobrien Fun = Ovl; 4369130561Sobrien else 4370130561Sobrien Fun = FunctionTemplate; 4371130561Sobrien 4372130561Sobrien // Look through all of the overloaded functions, searching for one 4373130561Sobrien // whose type matches exactly. 4374218822Sdim llvm::SmallPtrSet<FunctionDecl *, 4> Matches; 4375218822Sdim bool FoundNonTemplateFunction = false; 4376218822Sdim for (OverloadIterator FunEnd; Fun != FunEnd; ++Fun) { 4377218822Sdim // C++ [over.over]p3: 4378130561Sobrien // Non-member functions and static member functions match 4379130561Sobrien // targets of type "pointer-to-function" or "reference-to-function." 4380130561Sobrien // Nonstatic member functions match targets of 438189857Sobrien // type "pointer-to-member-function." 438289857Sobrien // Note that according to DR 247, the containing class does not matter. 438389857Sobrien 438489857Sobrien if (FunctionTemplateDecl *FunctionTemplate 4385130561Sobrien = dyn_cast<FunctionTemplateDecl>(*Fun)) { 4386130561Sobrien if (CXXMethodDecl *Method 4387130561Sobrien = dyn_cast<CXXMethodDecl>(FunctionTemplate->getTemplatedDecl())) { 438889857Sobrien // Skip non-static function templates when converting to pointer, and 438989857Sobrien // static when converting to member pointer. 439089857Sobrien if (Method->isStatic() == IsMember) 439189857Sobrien continue; 439289857Sobrien } else if (IsMember) 439389857Sobrien continue; 439489857Sobrien 4395104834Sobrien // C++ [over.over]p2: 439689857Sobrien // If the name is a function template, template argument deduction is 4397130561Sobrien // done (14.8.2.2), and if the argument deduction succeeds, the 4398130561Sobrien // resulting template argument list is used to generate a single 439989857Sobrien // function template specialization, which is added to the set of 4400130561Sobrien // overloaded functions considered. 4401130561Sobrien // FIXME: We don't really want to build the specialization here, do we? 4402130561Sobrien FunctionDecl *Specialization = 0; 4403130561Sobrien TemplateDeductionInfo Info(Context); 4404130561Sobrien if (TemplateDeductionResult Result 4405130561Sobrien = DeduceTemplateArguments(FunctionTemplate, HasExplicitTemplateArgs, 4406130561Sobrien ExplicitTemplateArgs, 4407130561Sobrien NumExplicitTemplateArgs, 4408130561Sobrien FunctionType, Specialization, Info)) { 440989857Sobrien // FIXME: make a note of the failed deduction for diagnostics. 441089857Sobrien (void)Result; 441189857Sobrien } else { 441289857Sobrien // FIXME: If the match isn't exact, shouldn't we just drop this as 441389857Sobrien // a candidate? Find a testcase before changing the code. 4414104834Sobrien assert(FunctionType 4415104834Sobrien == Context.getCanonicalType(Specialization->getType())); 441689857Sobrien Matches.insert( 441789857Sobrien cast<FunctionDecl>(Specialization->getCanonicalDecl())); 4418104834Sobrien } 4419104834Sobrien } 4420104834Sobrien 4421104834Sobrien if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*Fun)) { 4422104834Sobrien // Skip non-static functions when converting to pointer, and static 4423104834Sobrien // when converting to member pointer. 4424104834Sobrien if (Method->isStatic() == IsMember) 4425104834Sobrien continue; 4426104834Sobrien 4427104834Sobrien // If we have explicit template arguments, skip non-templates. 4428104834Sobrien if (HasExplicitTemplateArgs) 4429104834Sobrien continue; 4430104834Sobrien } else if (IsMember) 4431104834Sobrien continue; 4432104834Sobrien 4433104834Sobrien if (FunctionDecl *FunDecl = dyn_cast<FunctionDecl>(*Fun)) { 4434104834Sobrien if (FunctionType == Context.getCanonicalType(FunDecl->getType())) { 443589857Sobrien Matches.insert(cast<FunctionDecl>(Fun->getCanonicalDecl())); 4436218822Sdim FoundNonTemplateFunction = true; 4437130561Sobrien } 4438104834Sobrien } 4439130561Sobrien } 4440218822Sdim 4441218822Sdim // If there were 0 or 1 matches, we're done. 4442218822Sdim if (Matches.empty()) 4443104834Sobrien return 0; 4444104834Sobrien else if (Matches.size() == 1) { 444592828Sobrien FunctionDecl *Result = *Matches.begin(); 444692828Sobrien MarkDeclarationReferenced(From->getLocStart(), Result); 4447130561Sobrien return Result; 444892828Sobrien } 444989857Sobrien 445089857Sobrien // C++ [over.over]p4: 445189857Sobrien // If more than one function is selected, [...] 445289857Sobrien typedef llvm::SmallPtrSet<FunctionDecl *, 4>::iterator MatchIter; 445389857Sobrien if (!FoundNonTemplateFunction) { 4454130561Sobrien // [...] and any given function template specialization F1 is 4455130561Sobrien // eliminated if the set contains a second function template 4456218822Sdim // specialization whose function template is more specialized 445789857Sobrien // than the function template of F1 according to the partial 445889857Sobrien // ordering rules of 14.5.5.2. 445989857Sobrien 446089857Sobrien // The algorithm specified above is quadratic. We instead use a 446189857Sobrien // two-pass algorithm (similar to the one used to identify the 4462218822Sdim // best viable function in an overload set) that identifies the 4463218822Sdim // best function template (if it exists). 4464218822Sdim llvm::SmallVector<FunctionDecl *, 8> TemplateMatches(Matches.begin(), 4465218822Sdim Matches.end()); 4466218822Sdim FunctionDecl *Result = 4467218822Sdim getMostSpecialized(TemplateMatches.data(), TemplateMatches.size(), 446889857Sobrien TPOC_Other, From->getLocStart(), 4469130561Sobrien PDiag(), 447089857Sobrien PDiag(diag::err_addr_ovl_ambiguous) 447189857Sobrien << TemplateMatches[0]->getDeclName(), 4472130561Sobrien PDiag(diag::err_ovl_template_candidate)); 4473130561Sobrien MarkDeclarationReferenced(From->getLocStart(), Result); 4474130561Sobrien return Result; 4475130561Sobrien } 4476130561Sobrien 4477130561Sobrien // [...] any function template specializations in the set are 4478130561Sobrien // eliminated if the set also contains a non-template function, [...] 4479130561Sobrien llvm::SmallVector<FunctionDecl *, 4> RemainingMatches; 4480130561Sobrien for (MatchIter M = Matches.begin(), MEnd = Matches.end(); M != MEnd; ++M) 4481130561Sobrien if ((*M)->getPrimaryTemplate() == 0) 4482130561Sobrien RemainingMatches.push_back(*M); 4483130561Sobrien 4484130561Sobrien // [...] After such eliminations, if any, there shall remain exactly one 4485130561Sobrien // selected function. 4486130561Sobrien if (RemainingMatches.size() == 1) { 4487130561Sobrien FunctionDecl *Result = RemainingMatches.front(); 4488130561Sobrien MarkDeclarationReferenced(From->getLocStart(), Result); 4489130561Sobrien return Result; 4490130561Sobrien } 4491130561Sobrien 4492130561Sobrien // FIXME: We should probably return the same thing that BestViableFunction 4493130561Sobrien // returns (even if we issue the diagnostics here). 4494130561Sobrien Diag(From->getLocStart(), diag::err_addr_ovl_ambiguous) 4495130561Sobrien << RemainingMatches[0]->getDeclName(); 4496130561Sobrien for (unsigned I = 0, N = RemainingMatches.size(); I != N; ++I) 4497130561Sobrien Diag(RemainingMatches[I]->getLocation(), diag::err_ovl_candidate); 4498130561Sobrien return 0; 4499130561Sobrien} 4500130561Sobrien 4501130561Sobrien/// \brief Add a single candidate to the overload set. 4502130561Sobrienstatic void AddOverloadedCallCandidate(Sema &S, 4503130561Sobrien AnyFunctionDecl Callee, 4504130561Sobrien bool &ArgumentDependentLookup, 450589857Sobrien bool HasExplicitTemplateArgs, 450689857Sobrien const TemplateArgumentLoc *ExplicitTemplateArgs, 450789857Sobrien unsigned NumExplicitTemplateArgs, 450889857Sobrien Expr **Args, unsigned NumArgs, 450989857Sobrien OverloadCandidateSet &CandidateSet, 451089857Sobrien bool PartialOverloading) { 451189857Sobrien if (FunctionDecl *Func = dyn_cast<FunctionDecl>(Callee)) { 4512218822Sdim assert(!HasExplicitTemplateArgs && "Explicit template arguments?"); 4513130561Sobrien S.AddOverloadCandidate(Func, Args, NumArgs, CandidateSet, false, false, 4514130561Sobrien PartialOverloading); 4515130561Sobrien 451689857Sobrien if (Func->getDeclContext()->isRecord() || 451789857Sobrien Func->getDeclContext()->isFunctionOrMethod()) 451889857Sobrien ArgumentDependentLookup = false; 4519130561Sobrien return; 4520130561Sobrien } 452189857Sobrien 4522130561Sobrien FunctionTemplateDecl *FuncTemplate = cast<FunctionTemplateDecl>(Callee); 4523130561Sobrien S.AddTemplateOverloadCandidate(FuncTemplate, HasExplicitTemplateArgs, 4524130561Sobrien ExplicitTemplateArgs, 4525130561Sobrien NumExplicitTemplateArgs, 4526130561Sobrien Args, NumArgs, CandidateSet); 4527130561Sobrien 4528130561Sobrien if (FuncTemplate->getDeclContext()->isRecord()) 452989857Sobrien ArgumentDependentLookup = false; 4530130561Sobrien} 4531130561Sobrien 4532130561Sobrien/// \brief Add the overload candidates named by callee and/or found by argument 4533130561Sobrien/// dependent lookup to the given overload set. 4534130561Sobrienvoid Sema::AddOverloadedCallCandidates(NamedDecl *Callee, 4535130561Sobrien DeclarationName &UnqualifiedName, 4536130561Sobrien bool &ArgumentDependentLookup, 4537130561Sobrien bool HasExplicitTemplateArgs, 4538130561Sobrien const TemplateArgumentLoc *ExplicitTemplateArgs, 4539130561Sobrien unsigned NumExplicitTemplateArgs, 454089857Sobrien Expr **Args, unsigned NumArgs, 4541130561Sobrien OverloadCandidateSet &CandidateSet, 4542130561Sobrien bool PartialOverloading) { 454389857Sobrien // Add the functions denoted by Callee to the set of candidate 4544130561Sobrien // functions. While we're doing so, track whether argument-dependent 4545130561Sobrien // lookup still applies, per: 4546130561Sobrien // 4547130561Sobrien // C++0x [basic.lookup.argdep]p3: 4548130561Sobrien // Let X be the lookup set produced by unqualified lookup (3.4.1) 454989857Sobrien // and let Y be the lookup set produced by argument dependent 455089857Sobrien // lookup (defined as follows). If X contains 455189857Sobrien // 455289857Sobrien // -- a declaration of a class member, or 455389857Sobrien // 455489857Sobrien // -- a block-scope function declaration that is not a 455589857Sobrien // using-declaration (FIXME: check for using declaration), or 455689857Sobrien // 4557104834Sobrien // -- a declaration that is neither a function or a function 4558104834Sobrien // template 4559104834Sobrien // 4560104834Sobrien // then Y is empty. 456189857Sobrien if (!Callee) { 456289857Sobrien // Nothing to do. 456389857Sobrien } else if (OverloadedFunctionDecl *Ovl 4564104834Sobrien = dyn_cast<OverloadedFunctionDecl>(Callee)) { 456589857Sobrien for (OverloadedFunctionDecl::function_iterator Func = Ovl->function_begin(), 4566130561Sobrien FuncEnd = Ovl->function_end(); 456789857Sobrien Func != FuncEnd; ++Func) 4568130561Sobrien AddOverloadedCallCandidate(*this, *Func, ArgumentDependentLookup, 4569130561Sobrien HasExplicitTemplateArgs, 4570130561Sobrien ExplicitTemplateArgs, NumExplicitTemplateArgs, 4571130561Sobrien Args, NumArgs, CandidateSet, 457289857Sobrien PartialOverloading); 457389857Sobrien } else if (isa<FunctionDecl>(Callee) || isa<FunctionTemplateDecl>(Callee)) 457489857Sobrien AddOverloadedCallCandidate(*this, 457589857Sobrien AnyFunctionDecl::getFromNamedDecl(Callee), 457689857Sobrien ArgumentDependentLookup, 457789857Sobrien HasExplicitTemplateArgs, 457889857Sobrien ExplicitTemplateArgs, NumExplicitTemplateArgs, 457989857Sobrien Args, NumArgs, CandidateSet, 458089857Sobrien PartialOverloading); 458189857Sobrien // FIXME: assert isa<FunctionDecl> || isa<FunctionTemplateDecl> rather than 458289857Sobrien // checking dynamically. 4583130561Sobrien 4584130561Sobrien if (Callee) 4585130561Sobrien UnqualifiedName = Callee->getDeclName(); 4586130561Sobrien 4587130561Sobrien if (ArgumentDependentLookup) 4588130561Sobrien AddArgumentDependentLookupCandidates(UnqualifiedName, Args, NumArgs, 4589130561Sobrien HasExplicitTemplateArgs, 4590130561Sobrien ExplicitTemplateArgs, 4591130561Sobrien NumExplicitTemplateArgs, 4592130561Sobrien CandidateSet, 4593130561Sobrien PartialOverloading); 4594130561Sobrien} 4595130561Sobrien 459689857Sobrien/// ResolveOverloadedCallFn - Given the call expression that calls Fn 459789857Sobrien/// (which eventually refers to the declaration Func) and the call 459889857Sobrien/// arguments Args/NumArgs, attempt to resolve the function call down 459989857Sobrien/// to a specific function. If overload resolution succeeds, returns 460089857Sobrien/// the function declaration produced by overload 460189857Sobrien/// resolution. Otherwise, emits diagnostics, deletes all of the 4602218822Sdim/// arguments and Fn, and returns NULL. 460389857SobrienFunctionDecl *Sema::ResolveOverloadedCallFn(Expr *Fn, NamedDecl *Callee, 460489857Sobrien DeclarationName UnqualifiedName, 460589857Sobrien bool HasExplicitTemplateArgs, 460689857Sobrien const TemplateArgumentLoc *ExplicitTemplateArgs, 460789857Sobrien unsigned NumExplicitTemplateArgs, 4608130561Sobrien SourceLocation LParenLoc, 4609130561Sobrien Expr **Args, unsigned NumArgs, 461089857Sobrien SourceLocation *CommaLocs, 461189857Sobrien SourceLocation RParenLoc, 461289857Sobrien bool &ArgumentDependentLookup) { 461389857Sobrien OverloadCandidateSet CandidateSet; 461489857Sobrien 4615130561Sobrien // Add the functions denoted by Callee to the set of candidate 4616130561Sobrien // functions. 461789857Sobrien AddOverloadedCallCandidates(Callee, UnqualifiedName, ArgumentDependentLookup, 461889857Sobrien HasExplicitTemplateArgs, ExplicitTemplateArgs, 4619104834Sobrien NumExplicitTemplateArgs, Args, NumArgs, 4620104834Sobrien CandidateSet); 4621104834Sobrien OverloadCandidateSet::iterator Best; 4622218822Sdim switch (BestViableFunction(CandidateSet, Fn->getLocStart(), Best)) { 4623218822Sdim case OR_Success: 4624218822Sdim return Best->Function; 4625218822Sdim 4626218822Sdim case OR_No_Viable_Function: 4627218822Sdim Diag(Fn->getSourceRange().getBegin(), 4628218822Sdim diag::err_ovl_no_viable_function_in_call) 4629218822Sdim << UnqualifiedName << Fn->getSourceRange(); 4630218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 4631218822Sdim break; 4632218822Sdim 4633218822Sdim case OR_Ambiguous: 4634218822Sdim Diag(Fn->getSourceRange().getBegin(), diag::err_ovl_ambiguous_call) 4635218822Sdim << UnqualifiedName << Fn->getSourceRange(); 4636218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4637218822Sdim break; 4638218822Sdim 4639218822Sdim case OR_Deleted: 4640104834Sobrien Diag(Fn->getSourceRange().getBegin(), diag::err_ovl_deleted_call) 4641104834Sobrien << Best->Function->isDeleted() 464289857Sobrien << UnqualifiedName 4643218822Sdim << Fn->getSourceRange(); 464489857Sobrien PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 464589857Sobrien break; 464689857Sobrien } 4647130561Sobrien 4648130561Sobrien // Overload resolution failed. Destroy all of the subexpressions and 4649130561Sobrien // return NULL. 4650218822Sdim Fn->Destroy(Context); 4651218822Sdim for (unsigned Arg = 0; Arg < NumArgs; ++Arg) 4652130561Sobrien Args[Arg]->Destroy(Context); 4653218822Sdim return 0; 4654218822Sdim} 4655130561Sobrien 4656130561Sobrien/// \brief Create a unary operation that may resolve to an overloaded 4657130561Sobrien/// operator. 4658218822Sdim/// 4659130561Sobrien/// \param OpLoc The location of the operator itself (e.g., '*'). 4660130561Sobrien/// 4661218822Sdim/// \param OpcIn The UnaryOperator::Opcode that describes this 4662218822Sdim/// operator. 4663218822Sdim/// 4664218822Sdim/// \param Functions The set of non-member functions that will be 4665218822Sdim/// considered by overload resolution. The caller needs to build this 4666218822Sdim/// set based on the context using, e.g., 4667218822Sdim/// LookupOverloadedOperatorName() and ArgumentDependentLookup(). This 4668218822Sdim/// set should not contain any member functions; those will be added 466989857Sobrien/// by CreateOverloadedUnaryOp(). 467089857Sobrien/// 467189857Sobrien/// \param input The input argument. 4672130561SobrienSema::OwningExprResult Sema::CreateOverloadedUnaryOp(SourceLocation OpLoc, 4673130561Sobrien unsigned OpcIn, 4674130561Sobrien FunctionSet &Functions, 4675130561Sobrien ExprArg input) { 4676130561Sobrien UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4677130561Sobrien Expr *Input = (Expr *)input.get(); 4678130561Sobrien 4679130561Sobrien OverloadedOperatorKind Op = UnaryOperator::getOverloadedOperator(Opc); 4680130561Sobrien assert(Op != OO_None && "Invalid opcode for overloaded unary operator"); 4681130561Sobrien DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(Op); 4682130561Sobrien 4683130561Sobrien Expr *Args[2] = { Input, 0 }; 4684130561Sobrien unsigned NumArgs = 1; 4685130561Sobrien 4686130561Sobrien // For post-increment and post-decrement, add the implicit '0' as 4687130561Sobrien // the second argument, so that we know this is a post-increment or 4688130561Sobrien // post-decrement. 4689130561Sobrien if (Opc == UnaryOperator::PostInc || Opc == UnaryOperator::PostDec) { 4690130561Sobrien llvm::APSInt Zero(Context.getTypeSize(Context.IntTy), false); 4691130561Sobrien Args[1] = new (Context) IntegerLiteral(Zero, Context.IntTy, 4692130561Sobrien SourceLocation()); 4693130561Sobrien NumArgs = 2; 4694130561Sobrien } 4695130561Sobrien 4696130561Sobrien if (Input->isTypeDependent()) { 4697130561Sobrien OverloadedFunctionDecl *Overloads 4698130561Sobrien = OverloadedFunctionDecl::Create(Context, CurContext, OpName); 4699130561Sobrien for (FunctionSet::iterator Func = Functions.begin(), 4700130561Sobrien FuncEnd = Functions.end(); 4701130561Sobrien Func != FuncEnd; ++Func) 4702130561Sobrien Overloads->addOverload(*Func); 4703130561Sobrien 4704130561Sobrien DeclRefExpr *Fn = new (Context) DeclRefExpr(Overloads, Context.OverloadTy, 4705130561Sobrien OpLoc, false, false); 4706130561Sobrien 4707130561Sobrien input.release(); 4708130561Sobrien return Owned(new (Context) CXXOperatorCallExpr(Context, Op, Fn, 4709218822Sdim &Args[0], NumArgs, 4710218822Sdim Context.DependentTy, 4711130561Sobrien OpLoc)); 4712130561Sobrien } 4713218822Sdim 4714218822Sdim // Build an empty overload set. 4715218822Sdim OverloadCandidateSet CandidateSet; 4716130561Sobrien 4717218822Sdim // Add the candidates from the given function set. 4718218822Sdim AddFunctionCandidates(Functions, &Args[0], NumArgs, CandidateSet, false); 4719130561Sobrien 4720130561Sobrien // Add operator candidates that are member functions. 4721218822Sdim AddMemberOperatorCandidates(Op, OpLoc, &Args[0], NumArgs, CandidateSet); 4722130561Sobrien 4723130561Sobrien // Add builtin operator candidates. 4724130561Sobrien AddBuiltinOperatorCandidates(Op, OpLoc, &Args[0], NumArgs, CandidateSet); 4725130561Sobrien 4726218822Sdim // Perform overload resolution. 4727130561Sobrien OverloadCandidateSet::iterator Best; 4728218822Sdim switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 4729130561Sobrien case OR_Success: { 4730130561Sobrien // We found a built-in operator or an overloaded operator. 4731130561Sobrien FunctionDecl *FnDecl = Best->Function; 4732130561Sobrien 4733130561Sobrien if (FnDecl) { 4734130561Sobrien // We matched an overloaded operator. Build a call to that 4735130561Sobrien // operator. 4736130561Sobrien 4737130561Sobrien // Convert the arguments. 4738130561Sobrien if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 4739130561Sobrien if (PerformObjectArgumentInitialization(Input, Method)) 4740130561Sobrien return ExprError(); 4741130561Sobrien } else { 4742130561Sobrien // Convert the arguments. 4743130561Sobrien if (PerformCopyInitialization(Input, 4744130561Sobrien FnDecl->getParamDecl(0)->getType(), 4745130561Sobrien "passing")) 4746130561Sobrien return ExprError(); 4747130561Sobrien } 474889857Sobrien 4749104834Sobrien // Determine the result type 4750104834Sobrien QualType ResultTy = FnDecl->getResultType().getNonReferenceType(); 4751130561Sobrien 4752104834Sobrien // Build the actual expression node. 4753218822Sdim Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 4754218822Sdim SourceLocation()); 4755218822Sdim UsualUnaryConversions(FnExpr); 4756218822Sdim 4757218822Sdim input.release(); 4758218822Sdim Args[0] = Input; 4759218822Sdim ExprOwningPtr<CallExpr> TheCall(this, 4760218822Sdim new (Context) CXXOperatorCallExpr(Context, Op, FnExpr, 4761218822Sdim Args, NumArgs, ResultTy, OpLoc)); 4762218822Sdim 4763218822Sdim if (CheckCallReturnType(FnDecl->getResultType(), OpLoc, TheCall.get(), 4764218822Sdim FnDecl)) 4765104834Sobrien return ExprError(); 4766218822Sdim 4767218822Sdim return MaybeBindToTemporary(TheCall.release()); 4768218822Sdim } else { 4769218822Sdim // We matched a built-in operator. Convert the arguments, then 4770218822Sdim // break out so that we will build the appropriate built-in 4771218822Sdim // operator node. 4772218822Sdim if (PerformImplicitConversion(Input, Best->BuiltinTypes.ParamTypes[0], 4773104834Sobrien Best->Conversions[0], "passing")) 477489857Sobrien return ExprError(); 477589857Sobrien 4776130561Sobrien break; 4777130561Sobrien } 477889857Sobrien } 477989857Sobrien 478089857Sobrien case OR_No_Viable_Function: 478189857Sobrien // No viable function; fall through to handling this as a 478289857Sobrien // built-in operator, which will produce an error message for us. 478389857Sobrien break; 478489857Sobrien 478589857Sobrien case OR_Ambiguous: 478689857Sobrien Diag(OpLoc, diag::err_ovl_ambiguous_oper) 478789857Sobrien << UnaryOperator::getOpcodeStr(Opc) 478889857Sobrien << Input->getSourceRange(); 478989857Sobrien PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true, 479089857Sobrien UnaryOperator::getOpcodeStr(Opc), OpLoc); 479189857Sobrien return ExprError(); 479289857Sobrien 479389857Sobrien case OR_Deleted: 479489857Sobrien Diag(OpLoc, diag::err_ovl_deleted_oper) 479589857Sobrien << Best->Function->isDeleted() 479689857Sobrien << UnaryOperator::getOpcodeStr(Opc) 479789857Sobrien << Input->getSourceRange(); 4798130561Sobrien PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4799130561Sobrien return ExprError(); 4800218822Sdim } 4801130561Sobrien 480289857Sobrien // Either we found no viable overloaded operator or we matched a 4803104834Sobrien // built-in operator. In either case, fall through to trying to 480489857Sobrien // build a built-in operation. 480589857Sobrien input.release(); 480689857Sobrien return CreateBuiltinUnaryOp(OpLoc, Opc, Owned(Input)); 480789857Sobrien} 480889857Sobrien 480989857Sobrien/// \brief Create a binary operation that may resolve to an overloaded 481089857Sobrien/// operator. 481189857Sobrien/// 481289857Sobrien/// \param OpLoc The location of the operator itself (e.g., '+'). 481389857Sobrien/// 481489857Sobrien/// \param OpcIn The BinaryOperator::Opcode that describes this 481589857Sobrien/// operator. 481689857Sobrien/// 481789857Sobrien/// \param Functions The set of non-member functions that will be 4818130561Sobrien/// considered by overload resolution. The caller needs to build this 481989857Sobrien/// set based on the context using, e.g., 482089857Sobrien/// LookupOverloadedOperatorName() and ArgumentDependentLookup(). This 482189857Sobrien/// set should not contain any member functions; those will be added 482289857Sobrien/// by CreateOverloadedBinOp(). 482389857Sobrien/// 482489857Sobrien/// \param LHS Left-hand argument. 482589857Sobrien/// \param RHS Right-hand argument. 482689857SobrienSema::OwningExprResult 4827130561SobrienSema::CreateOverloadedBinOp(SourceLocation OpLoc, 482889857Sobrien unsigned OpcIn, 4829130561Sobrien FunctionSet &Functions, 483089857Sobrien Expr *LHS, Expr *RHS) { 483189857Sobrien Expr *Args[2] = { LHS, RHS }; 483289857Sobrien LHS=RHS=0; //Please use only Args instead of LHS/RHS couple 4833218822Sdim 4834130561Sobrien BinaryOperator::Opcode Opc = static_cast<BinaryOperator::Opcode>(OpcIn); 4835130561Sobrien OverloadedOperatorKind Op = BinaryOperator::getOverloadedOperator(Opc); 483689857Sobrien DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(Op); 483789857Sobrien 4838218822Sdim // If either side is type-dependent, create an appropriate dependent 483989857Sobrien // expression. 484089857Sobrien if (Args[0]->isTypeDependent() || Args[1]->isTypeDependent()) { 484189857Sobrien if (Functions.empty()) { 484289857Sobrien // If there are no functions to store, just build a dependent 484389857Sobrien // BinaryOperator or CompoundAssignment. 484489857Sobrien if (Opc <= BinaryOperator::Assign || Opc > BinaryOperator::OrAssign) 484589857Sobrien return Owned(new (Context) BinaryOperator(Args[0], Args[1], Opc, 484689857Sobrien Context.DependentTy, OpLoc)); 484789857Sobrien 484889857Sobrien return Owned(new (Context) CompoundAssignOperator(Args[0], Args[1], Opc, 484989857Sobrien Context.DependentTy, 485089857Sobrien Context.DependentTy, 485189857Sobrien Context.DependentTy, 485289857Sobrien OpLoc)); 485389857Sobrien } 485489857Sobrien 485589857Sobrien OverloadedFunctionDecl *Overloads 4856130561Sobrien = OverloadedFunctionDecl::Create(Context, CurContext, OpName); 485789857Sobrien for (FunctionSet::iterator Func = Functions.begin(), 4858218822Sdim FuncEnd = Functions.end(); 485989857Sobrien Func != FuncEnd; ++Func) 486089857Sobrien Overloads->addOverload(*Func); 486189857Sobrien 486289857Sobrien DeclRefExpr *Fn = new (Context) DeclRefExpr(Overloads, Context.OverloadTy, 4863218822Sdim OpLoc, false, false); 4864218822Sdim 486589857Sobrien return Owned(new (Context) CXXOperatorCallExpr(Context, Op, Fn, 486689857Sobrien Args, 2, 486789857Sobrien Context.DependentTy, 486889857Sobrien OpLoc)); 486989857Sobrien } 487089857Sobrien 487189857Sobrien // If this is the .* operator, which is not overloadable, just 487289857Sobrien // create a built-in binary operator. 487389857Sobrien if (Opc == BinaryOperator::PtrMemD) 487489857Sobrien return CreateBuiltinBinOp(OpLoc, Opc, Args[0], Args[1]); 4875218822Sdim 4876218822Sdim // If this is one of the assignment operators, we only perform 4877218822Sdim // overload resolution if the left-hand side is a class or 4878218822Sdim // enumeration type (C++ [expr.ass]p3). 4879218822Sdim if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 488089857Sobrien !Args[0]->getType()->isOverloadableType()) 488189857Sobrien return CreateBuiltinBinOp(OpLoc, Opc, Args[0], Args[1]); 4882130561Sobrien 488389857Sobrien // Build an empty overload set. 488489857Sobrien OverloadCandidateSet CandidateSet; 488589857Sobrien 488689857Sobrien // Add the candidates from the given function set. 488789857Sobrien AddFunctionCandidates(Functions, Args, 2, CandidateSet, false); 488889857Sobrien 488989857Sobrien // Add operator candidates that are member functions. 489089857Sobrien AddMemberOperatorCandidates(Op, OpLoc, Args, 2, CandidateSet); 489189857Sobrien 489289857Sobrien // Add builtin operator candidates. 489389857Sobrien AddBuiltinOperatorCandidates(Op, OpLoc, Args, 2, CandidateSet); 489489857Sobrien 489589857Sobrien // Perform overload resolution. 489689857Sobrien OverloadCandidateSet::iterator Best; 489789857Sobrien switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 489889857Sobrien case OR_Success: { 489989857Sobrien // We found a built-in operator or an overloaded operator. 4900218822Sdim FunctionDecl *FnDecl = Best->Function; 4901218822Sdim 490289857Sobrien if (FnDecl) { 490389857Sobrien // We matched an overloaded operator. Build a call to that 490489857Sobrien // operator. 4905130561Sobrien 490689857Sobrien // Convert the arguments. 4907218822Sdim if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 4908218822Sdim if (PerformObjectArgumentInitialization(Args[0], Method) || 490989857Sobrien PerformCopyInitialization(Args[1], FnDecl->getParamDecl(0)->getType(), 491089857Sobrien "passing")) 491189857Sobrien return ExprError(); 491289857Sobrien } else { 491389857Sobrien // Convert the arguments. 4914130561Sobrien if (PerformCopyInitialization(Args[0], FnDecl->getParamDecl(0)->getType(), 491589857Sobrien "passing") || 4916130561Sobrien PerformCopyInitialization(Args[1], FnDecl->getParamDecl(1)->getType(), 491789857Sobrien "passing")) 491889857Sobrien return ExprError(); 491989857Sobrien } 492089857Sobrien 492189857Sobrien // Determine the result type 492289857Sobrien QualType ResultTy 492389857Sobrien = FnDecl->getType()->getAs<FunctionType>()->getResultType(); 492489857Sobrien ResultTy = ResultTy.getNonReferenceType(); 4925130561Sobrien 492689857Sobrien // Build the actual expression node. 492789857Sobrien Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 492889857Sobrien OpLoc); 492989857Sobrien UsualUnaryConversions(FnExpr); 493089857Sobrien 493192828Sobrien ExprOwningPtr<CXXOperatorCallExpr> 493289857Sobrien TheCall(this, new (Context) CXXOperatorCallExpr(Context, Op, FnExpr, 493389857Sobrien Args, 2, ResultTy, 493489857Sobrien OpLoc)); 4935130561Sobrien 493689857Sobrien if (CheckCallReturnType(FnDecl->getResultType(), OpLoc, TheCall.get(), 493789857Sobrien FnDecl)) 4938218822Sdim return ExprError(); 4939218822Sdim 4940218822Sdim return MaybeBindToTemporary(TheCall.release()); 4941218822Sdim } else { 4942218822Sdim // We matched a built-in operator. Convert the arguments, then 4943218822Sdim // break out so that we will build the appropriate built-in 4944218822Sdim // operator node. 4945218822Sdim if (PerformImplicitConversion(Args[0], Best->BuiltinTypes.ParamTypes[0], 4946218822Sdim Best->Conversions[0], "passing") || 4947218822Sdim PerformImplicitConversion(Args[1], Best->BuiltinTypes.ParamTypes[1], 4948218822Sdim Best->Conversions[1], "passing")) 4949218822Sdim return ExprError(); 4950218822Sdim 4951218822Sdim break; 4952218822Sdim } 4953218822Sdim } 4954218822Sdim 4955218822Sdim case OR_No_Viable_Function: { 4956218822Sdim // C++ [over.match.oper]p9: 4957218822Sdim // If the operator is the operator , [...] and there are no 4958218822Sdim // viable functions, then the operator is assumed to be the 4959218822Sdim // built-in operator and interpreted according to clause 5. 4960218822Sdim if (Opc == BinaryOperator::Comma) 4961218822Sdim break; 4962218822Sdim 4963218822Sdim // For class as left operand for assignment or compound assigment operator 4964218822Sdim // do not fall through to handling in built-in, but report that no overloaded 4965218822Sdim // assignment operator found 4966218822Sdim OwningExprResult Result = ExprError(); 4967218822Sdim if (Args[0]->getType()->isRecordType() && 4968218822Sdim Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) { 4969218822Sdim Diag(OpLoc, diag::err_ovl_no_viable_oper) 4970218822Sdim << BinaryOperator::getOpcodeStr(Opc) 4971218822Sdim << Args[0]->getSourceRange() << Args[1]->getSourceRange(); 4972218822Sdim } else { 4973218822Sdim // No viable function; try to create a built-in operation, which will 4974218822Sdim // produce an error. Then, show the non-viable candidates. 4975218822Sdim Result = CreateBuiltinBinOp(OpLoc, Opc, Args[0], Args[1]); 4976218822Sdim } 4977218822Sdim assert(Result.isInvalid() && 4978218822Sdim "C++ binary operator overloading is missing candidates!"); 4979218822Sdim if (Result.isInvalid()) 4980218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false, 4981218822Sdim BinaryOperator::getOpcodeStr(Opc), OpLoc); 4982218822Sdim return move(Result); 4983218822Sdim } 4984218822Sdim 4985218822Sdim case OR_Ambiguous: 4986218822Sdim Diag(OpLoc, diag::err_ovl_ambiguous_oper) 4987218822Sdim << BinaryOperator::getOpcodeStr(Opc) 4988218822Sdim << Args[0]->getSourceRange() << Args[1]->getSourceRange(); 4989218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true, 4990218822Sdim BinaryOperator::getOpcodeStr(Opc), OpLoc); 4991218822Sdim return ExprError(); 4992218822Sdim 4993218822Sdim case OR_Deleted: 4994218822Sdim Diag(OpLoc, diag::err_ovl_deleted_oper) 4995218822Sdim << Best->Function->isDeleted() 4996218822Sdim << BinaryOperator::getOpcodeStr(Opc) 4997218822Sdim << Args[0]->getSourceRange() << Args[1]->getSourceRange(); 4998218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4999218822Sdim return ExprError(); 5000218822Sdim } 5001218822Sdim 5002218822Sdim // We matched a built-in operator; build it. 5003218822Sdim return CreateBuiltinBinOp(OpLoc, Opc, Args[0], Args[1]); 5004218822Sdim} 5005218822Sdim 5006218822SdimAction::OwningExprResult 5007218822SdimSema::CreateOverloadedArraySubscriptExpr(SourceLocation LLoc, 5008218822Sdim SourceLocation RLoc, 5009218822Sdim ExprArg Base, ExprArg Idx) { 5010218822Sdim Expr *Args[2] = { static_cast<Expr*>(Base.get()), 5011218822Sdim static_cast<Expr*>(Idx.get()) }; 5012218822Sdim DeclarationName OpName = 5013218822Sdim Context.DeclarationNames.getCXXOperatorName(OO_Subscript); 5014218822Sdim 5015218822Sdim // If either side is type-dependent, create an appropriate dependent 5016218822Sdim // expression. 5017218822Sdim if (Args[0]->isTypeDependent() || Args[1]->isTypeDependent()) { 5018218822Sdim 5019218822Sdim OverloadedFunctionDecl *Overloads 5020218822Sdim = OverloadedFunctionDecl::Create(Context, CurContext, OpName); 5021218822Sdim 5022218822Sdim DeclRefExpr *Fn = new (Context) DeclRefExpr(Overloads, Context.OverloadTy, 5023218822Sdim LLoc, false, false); 5024218822Sdim 5025218822Sdim Base.release(); 5026218822Sdim Idx.release(); 5027218822Sdim return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, Fn, 5028218822Sdim Args, 2, 5029218822Sdim Context.DependentTy, 5030218822Sdim RLoc)); 5031218822Sdim } 5032218822Sdim 5033218822Sdim // Build an empty overload set. 5034218822Sdim OverloadCandidateSet CandidateSet; 5035218822Sdim 5036218822Sdim // Subscript can only be overloaded as a member function. 5037218822Sdim 5038218822Sdim // Add operator candidates that are member functions. 5039218822Sdim AddMemberOperatorCandidates(OO_Subscript, LLoc, Args, 2, CandidateSet); 5040218822Sdim 5041218822Sdim // Add builtin operator candidates. 5042218822Sdim AddBuiltinOperatorCandidates(OO_Subscript, LLoc, Args, 2, CandidateSet); 5043218822Sdim 5044218822Sdim // Perform overload resolution. 5045218822Sdim OverloadCandidateSet::iterator Best; 5046218822Sdim switch (BestViableFunction(CandidateSet, LLoc, Best)) { 5047218822Sdim case OR_Success: { 5048218822Sdim // We found a built-in operator or an overloaded operator. 5049218822Sdim FunctionDecl *FnDecl = Best->Function; 5050218822Sdim 5051218822Sdim if (FnDecl) { 5052218822Sdim // We matched an overloaded operator. Build a call to that 5053218822Sdim // operator. 5054218822Sdim 5055218822Sdim // Convert the arguments. 5056218822Sdim CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5057218822Sdim if (PerformObjectArgumentInitialization(Args[0], Method) || 5058218822Sdim PerformCopyInitialization(Args[1], 5059218822Sdim FnDecl->getParamDecl(0)->getType(), 5060218822Sdim "passing")) 5061218822Sdim return ExprError(); 5062218822Sdim 5063218822Sdim // Determine the result type 5064218822Sdim QualType ResultTy 5065218822Sdim = FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5066218822Sdim ResultTy = ResultTy.getNonReferenceType(); 5067218822Sdim 5068218822Sdim // Build the actual expression node. 5069218822Sdim Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 5070218822Sdim LLoc); 5071218822Sdim UsualUnaryConversions(FnExpr); 5072218822Sdim 5073218822Sdim Base.release(); 5074218822Sdim Idx.release(); 5075218822Sdim ExprOwningPtr<CXXOperatorCallExpr> 5076218822Sdim TheCall(this, new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 5077218822Sdim FnExpr, Args, 2, 5078218822Sdim ResultTy, RLoc)); 5079218822Sdim 5080218822Sdim if (CheckCallReturnType(FnDecl->getResultType(), LLoc, TheCall.get(), 5081218822Sdim FnDecl)) 5082218822Sdim return ExprError(); 5083218822Sdim 5084218822Sdim return MaybeBindToTemporary(TheCall.release()); 5085218822Sdim } else { 5086218822Sdim // We matched a built-in operator. Convert the arguments, then 5087218822Sdim // break out so that we will build the appropriate built-in 5088218822Sdim // operator node. 5089218822Sdim if (PerformImplicitConversion(Args[0], Best->BuiltinTypes.ParamTypes[0], 5090218822Sdim Best->Conversions[0], "passing") || 5091218822Sdim PerformImplicitConversion(Args[1], Best->BuiltinTypes.ParamTypes[1], 5092218822Sdim Best->Conversions[1], "passing")) 5093218822Sdim return ExprError(); 5094218822Sdim 5095218822Sdim break; 5096218822Sdim } 5097218822Sdim } 5098218822Sdim 5099218822Sdim case OR_No_Viable_Function: { 5100218822Sdim // No viable function; try to create a built-in operation, which will 5101218822Sdim // produce an error. Then, show the non-viable candidates. 5102218822Sdim OwningExprResult Result = 5103218822Sdim CreateBuiltinArraySubscriptExpr(move(Base), LLoc, move(Idx), RLoc); 5104218822Sdim assert(Result.isInvalid() && 510589857Sobrien "C++ subscript operator overloading is missing candidates!"); 510689857Sobrien if (Result.isInvalid()) 510789857Sobrien PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false, 510889857Sobrien "[]", LLoc); 5109130561Sobrien return move(Result); 5110218822Sdim } 5111130561Sobrien 5112130561Sobrien case OR_Ambiguous: 5113130561Sobrien Diag(LLoc, diag::err_ovl_ambiguous_oper) 511489857Sobrien << "[]" << Args[0]->getSourceRange() << Args[1]->getSourceRange(); 5115218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true, 5116104834Sobrien "[]", LLoc); 5117218822Sdim return ExprError(); 5118218822Sdim 5119218822Sdim case OR_Deleted: 5120218822Sdim Diag(LLoc, diag::err_ovl_deleted_oper) 5121218822Sdim << Best->Function->isDeleted() << "[]" 5122218822Sdim << Args[0]->getSourceRange() << Args[1]->getSourceRange(); 5123218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 5124218822Sdim return ExprError(); 5125218822Sdim } 5126218822Sdim 5127218822Sdim // We matched a built-in operator; build it. 5128218822Sdim Base.release(); 5129218822Sdim Idx.release(); 5130218822Sdim return CreateBuiltinArraySubscriptExpr(Owned(Args[0]), LLoc, 5131218822Sdim Owned(Args[1]), RLoc); 5132218822Sdim} 5133218822Sdim 5134218822Sdim/// BuildCallToMemberFunction - Build a call to a member 5135218822Sdim/// function. MemExpr is the expression that refers to the member 5136218822Sdim/// function (and includes the object parameter), Args/NumArgs are the 5137218822Sdim/// arguments to the function call (not including the object 5138218822Sdim/// parameter). The caller needs to validate that the member 5139218822Sdim/// expression refers to a member function or an overloaded member 5140218822Sdim/// function. 5141218822SdimSema::ExprResult 5142218822SdimSema::BuildCallToMemberFunction(Scope *S, Expr *MemExprE, 5143218822Sdim SourceLocation LParenLoc, Expr **Args, 5144218822Sdim unsigned NumArgs, SourceLocation *CommaLocs, 5145218822Sdim SourceLocation RParenLoc) { 5146218822Sdim // Dig out the member expression. This holds both the object 5147218822Sdim // argument and the member function we're referring to. 5148218822Sdim MemberExpr *MemExpr = 0; 5149218822Sdim if (ParenExpr *ParenE = dyn_cast<ParenExpr>(MemExprE)) 5150218822Sdim MemExpr = dyn_cast<MemberExpr>(ParenE->getSubExpr()); 5151218822Sdim else 5152218822Sdim MemExpr = dyn_cast<MemberExpr>(MemExprE); 5153218822Sdim assert(MemExpr && "Building member call without member expression"); 5154218822Sdim 5155218822Sdim // Extract the object argument. 5156218822Sdim Expr *ObjectArg = MemExpr->getBase(); 5157218822Sdim 5158218822Sdim CXXMethodDecl *Method = 0; 5159218822Sdim if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 5160218822Sdim isa<FunctionTemplateDecl>(MemExpr->getMemberDecl())) { 5161218822Sdim // Add overload candidates 5162218822Sdim OverloadCandidateSet CandidateSet; 516389857Sobrien DeclarationName DeclName = MemExpr->getMemberDecl()->getDeclName(); 516489857Sobrien 5165130561Sobrien for (OverloadIterator Func(MemExpr->getMemberDecl()), FuncEnd; 5166218822Sdim Func != FuncEnd; ++Func) { 516789857Sobrien if ((Method = dyn_cast<CXXMethodDecl>(*Func))) { 5168130561Sobrien // If explicit template arguments were provided, we can't call a 516989857Sobrien // non-template member function. 517089857Sobrien if (MemExpr->hasExplicitTemplateArgumentList()) 517189857Sobrien continue; 517289857Sobrien 517389857Sobrien AddMethodCandidate(Method, ObjectArg, Args, NumArgs, CandidateSet, 517489857Sobrien /*SuppressUserConversions=*/false); 517589857Sobrien } else 517689857Sobrien AddMethodTemplateCandidate(cast<FunctionTemplateDecl>(*Func), 517789857Sobrien MemExpr->hasExplicitTemplateArgumentList(), 517889857Sobrien MemExpr->getTemplateArgs(), 517989857Sobrien MemExpr->getNumTemplateArgs(), 5180218822Sdim ObjectArg, Args, NumArgs, 5181218822Sdim CandidateSet, 5182218822Sdim /*SuppressUsedConversions=*/false); 5183218822Sdim } 5184218822Sdim 5185218822Sdim OverloadCandidateSet::iterator Best; 518689857Sobrien switch (BestViableFunction(CandidateSet, MemExpr->getLocStart(), Best)) { 5187104834Sobrien case OR_Success: 5188104834Sobrien Method = cast<CXXMethodDecl>(Best->Function); 5189218822Sdim break; 5190218822Sdim 5191218822Sdim case OR_No_Viable_Function: 5192218822Sdim Diag(MemExpr->getSourceRange().getBegin(), 5193218822Sdim diag::err_ovl_no_viable_member_function_in_call) 5194218822Sdim << DeclName << MemExprE->getSourceRange(); 5195218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 5196218822Sdim // FIXME: Leaking incoming expressions! 5197104834Sobrien return true; 5198218822Sdim 5199218822Sdim case OR_Ambiguous: 5200218822Sdim Diag(MemExpr->getSourceRange().getBegin(), 5201218822Sdim diag::err_ovl_ambiguous_member_call) 5202218822Sdim << DeclName << MemExprE->getSourceRange(); 5203218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 5204218822Sdim // FIXME: Leaking incoming expressions! 5205218822Sdim return true; 5206218822Sdim 5207218822Sdim case OR_Deleted: 5208218822Sdim Diag(MemExpr->getSourceRange().getBegin(), 5209218822Sdim diag::err_ovl_deleted_member_call) 5210104834Sobrien << Best->Function->isDeleted() 5211104834Sobrien << DeclName << MemExprE->getSourceRange(); 5212104834Sobrien PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 521389857Sobrien // FIXME: Leaking incoming expressions! 5214104834Sobrien return true; 5215104834Sobrien } 521689857Sobrien 521789857Sobrien FixOverloadedFunctionReference(MemExpr, Method); 521889857Sobrien } else { 521989857Sobrien Method = dyn_cast<CXXMethodDecl>(MemExpr->getMemberDecl()); 522089857Sobrien } 522189857Sobrien 522289857Sobrien assert(Method && "Member call to something that isn't a method?"); 522389857Sobrien ExprOwningPtr<CXXMemberCallExpr> 5224104834Sobrien TheCall(this, new (Context) CXXMemberCallExpr(Context, MemExpr, Args, 5225104834Sobrien NumArgs, 5226104834Sobrien Method->getResultType().getNonReferenceType(), 5227218822Sdim RParenLoc)); 5228104834Sobrien 5229218822Sdim // Check for a valid return type. 5230218822Sdim if (CheckCallReturnType(Method->getResultType(), MemExpr->getMemberLoc(), 5231218822Sdim TheCall.get(), Method)) 5232218822Sdim return true; 5233218822Sdim 5234218822Sdim // Convert the object argument (for a non-static member function call). 523589857Sobrien if (!Method->isStatic() && 523689857Sobrien PerformObjectArgumentInitialization(ObjectArg, Method)) 5237104834Sobrien return true; 523889857Sobrien MemExpr->setBase(ObjectArg); 523989857Sobrien 524089857Sobrien // Convert the rest of the arguments 524189857Sobrien const FunctionProtoType *Proto = cast<FunctionProtoType>(Method->getType()); 524289857Sobrien if (ConvertArgumentsForCall(&*TheCall, MemExpr, Method, Proto, Args, NumArgs, 5243130561Sobrien RParenLoc)) 5244130561Sobrien return true; 5245130561Sobrien 524689857Sobrien if (CheckFunctionCall(Method, TheCall.get())) 5247130561Sobrien return true; 524889857Sobrien 524989857Sobrien return MaybeBindToTemporary(TheCall.release()).release(); 5250130561Sobrien} 525189857Sobrien 525289857Sobrien/// BuildCallToObjectOfClassType - Build a call to an object of class 5253130561Sobrien/// type (C++ [over.call.object]), which can end up invoking an 5254130561Sobrien/// overloaded function call operator (@c operator()) or performing a 5255130561Sobrien/// user-defined conversion on the object argument. 525689857SobrienSema::ExprResult 525789857SobrienSema::BuildCallToObjectOfClassType(Scope *S, Expr *Object, 5258130561Sobrien SourceLocation LParenLoc, 525989857Sobrien Expr **Args, unsigned NumArgs, 526089857Sobrien SourceLocation *CommaLocs, 5261130561Sobrien SourceLocation RParenLoc) { 526289857Sobrien assert(Object->getType()->isRecordType() && "Requires object type argument"); 526389857Sobrien const RecordType *Record = Object->getType()->getAs<RecordType>(); 526489857Sobrien 526589857Sobrien // C++ [over.call.object]p1: 526689857Sobrien // If the primary-expression E in the function call syntax 5267130561Sobrien // evaluates to a class object of type "cv T", then the set of 5268130561Sobrien // candidate functions includes at least the function call 5269130561Sobrien // operators of T. The function call operators of T are obtained by 527089857Sobrien // ordinary lookup of the name operator() in the context of 527189857Sobrien // (E).operator(). 5272130561Sobrien OverloadCandidateSet CandidateSet; 5273130561Sobrien DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(OO_Call); 5274130561Sobrien 5275130561Sobrien if (RequireCompleteType(LParenLoc, Object->getType(), 5276130561Sobrien PartialDiagnostic(diag::err_incomplete_object_call) 5277130561Sobrien << Object->getSourceRange())) 5278130561Sobrien return true; 5279130561Sobrien 5280218822Sdim LookupResult R(*this, OpName, LParenLoc, LookupOrdinaryName); 5281218822Sdim LookupQualifiedName(R, Record->getDecl()); 5282218822Sdim R.suppressDiagnostics(); 5283130561Sobrien 5284130561Sobrien for (LookupResult::iterator Oper = R.begin(), OperEnd = R.end(); 5285130561Sobrien Oper != OperEnd; ++Oper) { 5286130561Sobrien AddMethodCandidate(*Oper, Object, Args, NumArgs, CandidateSet, 5287130561Sobrien /*SuppressUserConversions=*/ false); 5288130561Sobrien } 5289130561Sobrien 5290130561Sobrien // C++ [over.call.object]p2: 5291130561Sobrien // In addition, for each conversion function declared in T of the 5292130561Sobrien // form 5293130561Sobrien // 529489857Sobrien // operator conversion-type-id () cv-qualifier; 529589857Sobrien // 5296130561Sobrien // where cv-qualifier is the same cv-qualification as, or a 5297130561Sobrien // greater cv-qualification than, cv, and where conversion-type-id 5298130561Sobrien // denotes the type "pointer to function of (P1,...,Pn) returning 5299130561Sobrien // R", or the type "reference to pointer to function of 5300130561Sobrien // (P1,...,Pn) returning R", or the type "reference to function 5301130561Sobrien // of (P1,...,Pn) returning R", a surrogate call function [...] 5302130561Sobrien // is also considered as a candidate function. Similarly, 5303130561Sobrien // surrogate call functions are added to the set of candidate 5304130561Sobrien // functions for each conversion function declared in an 5305130561Sobrien // accessible base class provided the function is not hidden 5306130561Sobrien // within T by another intervening declaration. 5307130561Sobrien // FIXME: Look in base classes for more conversion operators! 5308130561Sobrien OverloadedFunctionDecl *Conversions 5309130561Sobrien = cast<CXXRecordDecl>(Record->getDecl())->getConversionFunctions(); 5310130561Sobrien for (OverloadedFunctionDecl::function_iterator 5311130561Sobrien Func = Conversions->function_begin(), 5312130561Sobrien FuncEnd = Conversions->function_end(); 5313130561Sobrien Func != FuncEnd; ++Func) { 5314130561Sobrien CXXConversionDecl *Conv; 5315130561Sobrien FunctionTemplateDecl *ConvTemplate; 5316130561Sobrien GetFunctionAndTemplate(*Func, Conv, ConvTemplate); 5317130561Sobrien 5318130561Sobrien // Skip over templated conversion functions; they aren't 5319130561Sobrien // surrogates. 5320130561Sobrien if (ConvTemplate) 5321130561Sobrien continue; 5322130561Sobrien 5323130561Sobrien // Strip the reference type (if any) and then the pointer type (if 5324130561Sobrien // any) to get down to what might be a function type. 532589857Sobrien QualType ConvType = Conv->getConversionType().getNonReferenceType(); 532689857Sobrien if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>()) 532789857Sobrien ConvType = ConvPtrType->getPointeeType(); 532889857Sobrien 532989857Sobrien if (const FunctionProtoType *Proto = ConvType->getAs<FunctionProtoType>()) 533089857Sobrien AddSurrogateCandidate(Conv, Proto, Object, Args, NumArgs, CandidateSet); 5331130561Sobrien } 5332130561Sobrien 5333130561Sobrien // Perform overload resolution. 5334130561Sobrien OverloadCandidateSet::iterator Best; 5335130561Sobrien switch (BestViableFunction(CandidateSet, Object->getLocStart(), Best)) { 5336130561Sobrien case OR_Success: 5337130561Sobrien // Overload resolution succeeded; we'll build the appropriate call 5338130561Sobrien // below. 5339130561Sobrien break; 5340130561Sobrien 5341130561Sobrien case OR_No_Viable_Function: 5342130561Sobrien Diag(Object->getSourceRange().getBegin(), 5343130561Sobrien diag::err_ovl_no_viable_object_call) 5344130561Sobrien << Object->getType() << Object->getSourceRange(); 5345130561Sobrien PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 5346130561Sobrien break; 5347130561Sobrien 5348130561Sobrien case OR_Ambiguous: 5349130561Sobrien Diag(Object->getSourceRange().getBegin(), 535089857Sobrien diag::err_ovl_ambiguous_object_call) 535189857Sobrien << Object->getType() << Object->getSourceRange(); 535289857Sobrien PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 535389857Sobrien break; 535489857Sobrien 535589857Sobrien case OR_Deleted: 535689857Sobrien Diag(Object->getSourceRange().getBegin(), 5357104834Sobrien diag::err_ovl_deleted_object_call) 5358104834Sobrien << Best->Function->isDeleted() 5359104834Sobrien << Object->getType() << Object->getSourceRange(); 536089857Sobrien PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 5361130561Sobrien break; 536289857Sobrien } 5363130561Sobrien 536489857Sobrien if (Best == CandidateSet.end()) { 5365130561Sobrien // We had an error; delete all of the subexpressions and return 5366130561Sobrien // the error. 5367130561Sobrien Object->Destroy(Context); 5368218822Sdim for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) 5369130561Sobrien Args[ArgIdx]->Destroy(Context); 537089857Sobrien return true; 537189857Sobrien } 537289857Sobrien 537389857Sobrien if (Best->Function == 0) { 537489857Sobrien // Since there is no function declaration, this is one of the 537589857Sobrien // surrogate candidates. Dig out the conversion function. 537689857Sobrien CXXConversionDecl *Conv 5377130561Sobrien = cast<CXXConversionDecl>( 537889857Sobrien Best->Conversions[0].UserDefined.ConversionFunction); 537989857Sobrien 5380218822Sdim // We selected one of the surrogate functions that converts the 5381218822Sdim // object parameter to a function pointer. Perform the conversion 5382218822Sdim // on the object argument, then let ActOnCallExpr finish the job. 5383218822Sdim 5384218822Sdim // Create an implicit member expr to refer to the conversion operator. 5385218822Sdim // and then call it. 5386218822Sdim CXXMemberCallExpr *CE = 5387218822Sdim BuildCXXMemberCallExpr(Object, Conv); 5388218822Sdim 5389218822Sdim return ActOnCallExpr(S, ExprArg(*this, CE), LParenLoc, 5390218822Sdim MultiExprArg(*this, (ExprTy**)Args, NumArgs), 5391218822Sdim CommaLocs, RParenLoc).release(); 5392218822Sdim } 5393218822Sdim 5394218822Sdim // We found an overloaded operator(). Build a CXXOperatorCallExpr 5395218822Sdim // that calls this method, using Object for the implicit object 5396218822Sdim // parameter and passing along the remaining arguments. 5397218822Sdim CXXMethodDecl *Method = cast<CXXMethodDecl>(Best->Function); 5398218822Sdim const FunctionProtoType *Proto = Method->getType()->getAs<FunctionProtoType>(); 5399218822Sdim 5400218822Sdim unsigned NumArgsInProto = Proto->getNumArgs(); 5401218822Sdim unsigned NumArgsToCheck = NumArgs; 5402218822Sdim 5403218822Sdim // Build the full argument list for the method call (the 5404218822Sdim // implicit object parameter is placed at the beginning of the 5405218822Sdim // list). 5406218822Sdim Expr **MethodArgs; 5407218822Sdim if (NumArgs < NumArgsInProto) { 5408218822Sdim NumArgsToCheck = NumArgsInProto; 5409218822Sdim MethodArgs = new Expr*[NumArgsInProto + 1]; 5410218822Sdim } else { 5411218822Sdim MethodArgs = new Expr*[NumArgs + 1]; 5412218822Sdim } 5413218822Sdim MethodArgs[0] = Object; 5414218822Sdim for (unsigned ArgIdx = 0; ArgIdx < NumArgs; ++ArgIdx) 5415218822Sdim MethodArgs[ArgIdx + 1] = Args[ArgIdx]; 5416218822Sdim 5417218822Sdim Expr *NewFn = new (Context) DeclRefExpr(Method, Method->getType(), 5418218822Sdim SourceLocation()); 5419218822Sdim UsualUnaryConversions(NewFn); 5420218822Sdim 5421218822Sdim // Once we've built TheCall, all of the expressions are properly 5422218822Sdim // owned. 5423218822Sdim QualType ResultTy = Method->getResultType().getNonReferenceType(); 5424218822Sdim ExprOwningPtr<CXXOperatorCallExpr> 5425218822Sdim TheCall(this, new (Context) CXXOperatorCallExpr(Context, OO_Call, NewFn, 5426218822Sdim MethodArgs, NumArgs + 1, 5427218822Sdim ResultTy, RParenLoc)); 5428218822Sdim delete [] MethodArgs; 5429218822Sdim 5430218822Sdim if (CheckCallReturnType(Method->getResultType(), LParenLoc, TheCall.get(), 5431218822Sdim Method)) 5432218822Sdim return true; 5433218822Sdim 5434218822Sdim // We may have default arguments. If so, we need to allocate more 5435218822Sdim // slots in the call for them. 5436218822Sdim if (NumArgs < NumArgsInProto) 5437218822Sdim TheCall->setNumArgs(Context, NumArgsInProto + 1); 5438218822Sdim else if (NumArgs > NumArgsInProto) 5439218822Sdim NumArgsToCheck = NumArgsInProto; 5440218822Sdim 5441218822Sdim bool IsError = false; 5442218822Sdim 5443218822Sdim // Initialize the implicit object parameter. 5444218822Sdim IsError |= PerformObjectArgumentInitialization(Object, Method); 5445218822Sdim TheCall->setArg(0, Object); 5446218822Sdim 5447218822Sdim 5448218822Sdim // Check the argument types. 5449218822Sdim for (unsigned i = 0; i != NumArgsToCheck; i++) { 5450218822Sdim Expr *Arg; 5451218822Sdim if (i < NumArgs) { 5452218822Sdim Arg = Args[i]; 5453218822Sdim 5454218822Sdim // Pass the argument. 5455218822Sdim QualType ProtoArgType = Proto->getArgType(i); 5456218822Sdim IsError |= PerformCopyInitialization(Arg, ProtoArgType, "passing"); 5457218822Sdim } else { 5458218822Sdim OwningExprResult DefArg 5459218822Sdim = BuildCXXDefaultArgExpr(LParenLoc, Method, Method->getParamDecl(i)); 5460218822Sdim if (DefArg.isInvalid()) { 5461218822Sdim IsError = true; 5462218822Sdim break; 5463218822Sdim } 5464218822Sdim 5465218822Sdim Arg = DefArg.takeAs<Expr>(); 5466218822Sdim } 5467218822Sdim 5468218822Sdim TheCall->setArg(i + 1, Arg); 5469218822Sdim } 5470218822Sdim 5471218822Sdim // If this is a variadic call, handle args passed through "...". 5472218822Sdim if (Proto->isVariadic()) { 5473218822Sdim // Promote the arguments (C99 6.5.2.2p7). 5474218822Sdim for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 5475218822Sdim Expr *Arg = Args[i]; 5476218822Sdim IsError |= DefaultVariadicArgumentPromotion(Arg, VariadicMethod); 5477218822Sdim TheCall->setArg(i + 1, Arg); 5478218822Sdim } 5479218822Sdim } 5480218822Sdim 5481218822Sdim if (IsError) return true; 5482218822Sdim 5483218822Sdim if (CheckFunctionCall(Method, TheCall.get())) 5484218822Sdim return true; 5485218822Sdim 5486218822Sdim return MaybeBindToTemporary(TheCall.release()).release(); 5487218822Sdim} 5488218822Sdim 5489218822Sdim/// BuildOverloadedArrowExpr - Build a call to an overloaded @c operator-> 5490218822Sdim/// (if one exists), where @c Base is an expression of class type and 5491218822Sdim/// @c Member is the name of the member we're trying to find. 5492218822SdimSema::OwningExprResult 5493218822SdimSema::BuildOverloadedArrowExpr(Scope *S, ExprArg BaseIn, SourceLocation OpLoc) { 5494218822Sdim Expr *Base = static_cast<Expr *>(BaseIn.get()); 5495218822Sdim assert(Base->getType()->isRecordType() && "left-hand side must have class type"); 5496218822Sdim 5497218822Sdim // C++ [over.ref]p1: 5498218822Sdim // 5499218822Sdim // [...] An expression x->m is interpreted as (x.operator->())->m 5500218822Sdim // for a class object x of type T if T::operator->() exists and if 5501218822Sdim // the operator is selected as the best match function by the 5502218822Sdim // overload resolution mechanism (13.3). 5503218822Sdim DeclarationName OpName = Context.DeclarationNames.getCXXOperatorName(OO_Arrow); 5504218822Sdim OverloadCandidateSet CandidateSet; 5505218822Sdim const RecordType *BaseRecord = Base->getType()->getAs<RecordType>(); 5506218822Sdim 5507218822Sdim if (RequireCompleteType(Base->getLocStart(), Base->getType(), 5508218822Sdim PDiag(diag::err_typecheck_incomplete_tag) 5509218822Sdim << Base->getSourceRange())) 5510218822Sdim return ExprError(); 5511218822Sdim 5512218822Sdim LookupResult R(*this, OpName, OpLoc, LookupOrdinaryName); 5513218822Sdim LookupQualifiedName(R, BaseRecord->getDecl()); 5514218822Sdim R.suppressDiagnostics(); 5515218822Sdim 5516218822Sdim for (LookupResult::iterator Oper = R.begin(), OperEnd = R.end(); 5517218822Sdim Oper != OperEnd; ++Oper) 5518218822Sdim AddMethodCandidate(cast<CXXMethodDecl>(*Oper), Base, 0, 0, CandidateSet, 5519218822Sdim /*SuppressUserConversions=*/false); 5520218822Sdim 5521218822Sdim // Perform overload resolution. 5522218822Sdim OverloadCandidateSet::iterator Best; 5523218822Sdim switch (BestViableFunction(CandidateSet, OpLoc, Best)) { 5524218822Sdim case OR_Success: 5525218822Sdim // Overload resolution succeeded; we'll build the call below. 5526218822Sdim break; 5527218822Sdim 5528218822Sdim case OR_No_Viable_Function: 5529218822Sdim if (CandidateSet.empty()) 5530218822Sdim Diag(OpLoc, diag::err_typecheck_member_reference_arrow) 5531218822Sdim << Base->getType() << Base->getSourceRange(); 5532218822Sdim else 5533218822Sdim Diag(OpLoc, diag::err_ovl_no_viable_oper) 5534218822Sdim << "operator->" << Base->getSourceRange(); 5535218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 5536218822Sdim return ExprError(); 5537218822Sdim 5538218822Sdim case OR_Ambiguous: 5539218822Sdim Diag(OpLoc, diag::err_ovl_ambiguous_oper) 5540218822Sdim << "->" << Base->getSourceRange(); 5541218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 5542218822Sdim return ExprError(); 5543218822Sdim 5544218822Sdim case OR_Deleted: 5545218822Sdim Diag(OpLoc, diag::err_ovl_deleted_oper) 5546218822Sdim << Best->Function->isDeleted() 5547218822Sdim << "->" << Base->getSourceRange(); 5548218822Sdim PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 5549218822Sdim return ExprError(); 5550218822Sdim } 5551218822Sdim 5552218822Sdim // Convert the object parameter. 5553218822Sdim CXXMethodDecl *Method = cast<CXXMethodDecl>(Best->Function); 5554218822Sdim if (PerformObjectArgumentInitialization(Base, Method)) 5555218822Sdim return ExprError(); 5556218822Sdim 5557218822Sdim // No concerns about early exits now. 5558218822Sdim BaseIn.release(); 5559218822Sdim 5560218822Sdim // Build the operator call. 5561218822Sdim Expr *FnExpr = new (Context) DeclRefExpr(Method, Method->getType(), 5562218822Sdim SourceLocation()); 5563218822Sdim UsualUnaryConversions(FnExpr); 5564218822Sdim 5565218822Sdim QualType ResultTy = Method->getResultType().getNonReferenceType(); 5566218822Sdim ExprOwningPtr<CXXOperatorCallExpr> 5567218822Sdim TheCall(this, new (Context) CXXOperatorCallExpr(Context, OO_Arrow, FnExpr, 5568218822Sdim &Base, 1, ResultTy, OpLoc)); 5569218822Sdim 5570218822Sdim if (CheckCallReturnType(Method->getResultType(), OpLoc, TheCall.get(), 5571218822Sdim Method)) 5572218822Sdim return ExprError(); 5573218822Sdim return move(TheCall); 5574218822Sdim} 5575218822Sdim 5576218822Sdim/// FixOverloadedFunctionReference - E is an expression that refers to 5577218822Sdim/// a C++ overloaded function (possibly with some parentheses and 5578218822Sdim/// perhaps a '&' around it). We have resolved the overloaded function 5579218822Sdim/// to the function declaration Fn, so patch up the expression E to 5580218822Sdim/// refer (possibly indirectly) to Fn. Returns the new expr. 5581218822SdimExpr *Sema::FixOverloadedFunctionReference(Expr *E, FunctionDecl *Fn) { 5582218822Sdim if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) { 5583218822Sdim Expr *NewExpr = FixOverloadedFunctionReference(PE->getSubExpr(), Fn); 5584218822Sdim PE->setSubExpr(NewExpr); 5585218822Sdim PE->setType(NewExpr->getType()); 5586218822Sdim } else if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 5587218822Sdim Expr *NewExpr = FixOverloadedFunctionReference(ICE->getSubExpr(), Fn); 5588218822Sdim assert(Context.hasSameType(ICE->getSubExpr()->getType(), 5589218822Sdim NewExpr->getType()) && 5590218822Sdim "Implicit cast type cannot be determined from overload"); 5591218822Sdim ICE->setSubExpr(NewExpr); 5592218822Sdim } else if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(E)) { 5593218822Sdim assert(UnOp->getOpcode() == UnaryOperator::AddrOf && 5594218822Sdim "Can only take the address of an overloaded function"); 5595218822Sdim if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) { 5596218822Sdim if (Method->isStatic()) { 5597218822Sdim // Do nothing: static member functions aren't any different 5598218822Sdim // from non-member functions. 5599218822Sdim } else if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr())) { 5600218822Sdim if (DRE->getQualifier()) { 5601218822Sdim // We have taken the address of a pointer to member 5602218822Sdim // function. Perform the computation here so that we get the 5603218822Sdim // appropriate pointer to member type. 5604218822Sdim DRE->setDecl(Fn); 560589857Sobrien DRE->setType(Fn->getType()); 560689857Sobrien QualType ClassType 560789857Sobrien = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 5608218822Sdim E->setType(Context.getMemberPointerType(Fn->getType(), 5609130561Sobrien ClassType.getTypePtr())); 5610130561Sobrien return E; 561189857Sobrien } 561289857Sobrien } 561389857Sobrien // FIXME: TemplateIdRefExpr referring to a member function template 5614130561Sobrien // specialization! 5615130561Sobrien } 5616130561Sobrien Expr *NewExpr = FixOverloadedFunctionReference(UnOp->getSubExpr(), Fn); 5617130561Sobrien UnOp->setSubExpr(NewExpr); 561889857Sobrien UnOp->setType(Context.getPointerType(NewExpr->getType())); 5619130561Sobrien 5620130561Sobrien return UnOp; 5621130561Sobrien } else if (DeclRefExpr *DR = dyn_cast<DeclRefExpr>(E)) { 562289857Sobrien assert((isa<OverloadedFunctionDecl>(DR->getDecl()) || 5623130561Sobrien isa<FunctionTemplateDecl>(DR->getDecl()) || 5624130561Sobrien isa<FunctionDecl>(DR->getDecl())) && 562594536Sobrien "Expected function or function template"); 5626130561Sobrien DR->setDecl(Fn); 562789857Sobrien E->setType(Fn->getType()); 562889857Sobrien } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(E)) { 5629218822Sdim MemExpr->setMemberDecl(Fn); 5630218822Sdim E->setType(Fn->getType()); 5631218822Sdim } else if (TemplateIdRefExpr *TID = dyn_cast<TemplateIdRefExpr>(E)) { 5632218822Sdim E = DeclRefExpr::Create(Context, 5633218822Sdim TID->getQualifier(), TID->getQualifierRange(), 5634218822Sdim Fn, TID->getTemplateNameLoc(), 5635218822Sdim true, 5636218822Sdim TID->getLAngleLoc(), 5637218822Sdim TID->getTemplateArgs(), 5638218822Sdim TID->getNumTemplateArgs(), 5639218822Sdim TID->getRAngleLoc(), 5640218822Sdim Fn->getType(), 5641218822Sdim /*FIXME?*/false, /*FIXME?*/false); 5642218822Sdim 5643218822Sdim // FIXME: Don't destroy TID here, since we need its template arguments 5644218822Sdim // to survive. 5645218822Sdim // TID->Destroy(Context); 5646218822Sdim } else if (isa<UnresolvedFunctionNameExpr>(E)) { 564789857Sobrien return DeclRefExpr::Create(Context, 564889857Sobrien /*Qualifier=*/0, 5649130561Sobrien /*QualifierRange=*/SourceRange(), 5650130561Sobrien Fn, E->getLocStart(), 565189857Sobrien Fn->getType(), false, false); 5652130561Sobrien } else { 5653130561Sobrien assert(false && "Invalid reference to overloaded function"); 5654130561Sobrien } 5655130561Sobrien 5656130561Sobrien return E; 5657130561Sobrien} 5658130561Sobrien 565989857Sobrien} // end namespace clang 5660130561Sobrien