SemaTemplateDeduction.cpp revision b251302dd52249c49ba6527fcd013396deef22cf
10b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor//===------- SemaTemplateDeduction.cpp - Template Argument Deduction ------===/ 20b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// 30b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// The LLVM Compiler Infrastructure 40b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// 50b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// This file is distributed under the University of Illinois Open Source 60b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// License. See LICENSE.TXT for details. 70b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor//===----------------------------------------------------------------------===/ 80b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// 90b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// This file implements C++ template argument deduction. 100b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// 110b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor//===----------------------------------------------------------------------===/ 120b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 13e737f5041a36d0befb39ffeed8d50ba15916d3daDouglas Gregor#include "clang/Sema/Sema.h" 1419510856727e0e14a3696b2a72c35163bff2a71fJohn McCall#include "clang/Sema/DeclSpec.h" 157cd088e519d7e6caa4c4c12db52e0e4ae35d25c2John McCall#include "clang/Sema/Template.h" 162a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall#include "clang/Sema/TemplateDeduction.h" 170b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/ASTContext.h" 187cd088e519d7e6caa4c4c12db52e0e4ae35d25c2John McCall#include "clang/AST/DeclObjC.h" 190b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/DeclTemplate.h" 200b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/StmtVisitor.h" 210b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/Expr.h" 220b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/ExprCXX.h" 23013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer#include "llvm/ADT/SmallBitVector.h" 2434b41d939a1328f484511c6002ba2456db879a29Richard Smith#include "TreeTransform.h" 258a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor#include <algorithm> 26508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor 27508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregornamespace clang { 282a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall using namespace sema; 292a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall 30508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Various flags that control template argument deduction. 31508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// 32508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// These flags can be bitwise-OR'd together. 33508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor enum TemplateDeductionFlags { 34508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief No template argument deduction flags, which indicates the 35508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// strictest results for template argument deduction (as used for, e.g., 36508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// matching class template partial specializations). 37508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF_None = 0, 38508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Within template argument deduction from a function call, we are 39508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// matching with a parameter type for which the original parameter was 40508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// a reference. 41508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF_ParamWithReferenceType = 0x1, 42508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Within template argument deduction from a function call, we 43508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// are matching in a case where we ignore cv-qualifiers. 44508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF_IgnoreQualifiers = 0x02, 45508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Within template argument deduction from a function call, 46508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// we are matching in a case where we can perform template argument 474112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor /// deduction from a template-id of a derived class of the argument type. 481282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor TDF_DerivedClass = 0x04, 491282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor /// \brief Allow non-dependent types to differ, e.g., when performing 501282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor /// template argument deduction from a function call where conversions 511282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor /// may apply. 5273b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF_SkipNonDependent = 0x08, 5373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor /// \brief Whether we are performing template argument deduction for 54dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi /// parameters and arguments in a top-level template argument 5573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF_TopLevelParameterTypeList = 0x10 56508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor }; 57508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor} 58508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor 590b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregorusing namespace clang; 600b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 619d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor/// \brief Compare two APSInts, extending and switching the sign as 629d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor/// necessary to compare their values regardless of underlying type. 639d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregorstatic bool hasSameExtendedValue(llvm::APSInt X, llvm::APSInt Y) { 649d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if (Y.getBitWidth() > X.getBitWidth()) 659f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad X = X.extend(Y.getBitWidth()); 669d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor else if (Y.getBitWidth() < X.getBitWidth()) 679f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Y = Y.extend(X.getBitWidth()); 689d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 699d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor // If there is a signedness mismatch, correct it. 709d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if (X.isSigned() != Y.isSigned()) { 719d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor // If the signed value is negative, then the values cannot be the same. 729d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if ((Y.isSigned() && Y.isNegative()) || (X.isSigned() && X.isNegative())) 739d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor return false; 749d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 759d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor Y.setIsSigned(true); 769d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor X.setIsSigned(true); 779d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor } 789d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 799d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor return X == Y; 809d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor} 819d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 82f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 83a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 84f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 85f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor const TemplateArgument &Param, 8677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor TemplateArgument Arg, 872a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 885f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced); 89d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 90b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \brief Whether template argument deduction for two reference parameters 91b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// resulted in the argument type, parameter type, or neither type being more 92b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// qualified than the other. 93dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumienum DeductionQualifierComparison { 94dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NeitherMoreQualified = 0, 95dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ParamMoreQualified, 96dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ArgMoreQualified 975c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor}; 985c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor 99b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \brief Stores the result of comparing two reference parameters while 100b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// performing template argument deduction for partial ordering of function 101dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// templates. 102b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregorstruct RefParamPartialOrderingComparison { 103b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /// \brief Whether the parameter type is an rvalue reference type. 104b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor bool ParamIsRvalueRef; 105b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /// \brief Whether the argument type is an rvalue reference type. 106b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor bool ArgIsRvalueRef; 107dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 108b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /// \brief Whether the parameter or argument (or neither) is more qualified. 109b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor DeductionQualifierComparison Qualifiers; 110b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor}; 111b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 112b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 1135c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor 11420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregorstatic Sema::TemplateDeductionResult 115bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian RedlDeduceTemplateArgumentsByTypeMatch(Sema &S, 116bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TemplateParameterList *TemplateParams, 117bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl QualType Param, 118bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl QualType Arg, 119bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TemplateDeductionInfo &Info, 120bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl SmallVectorImpl<DeducedTemplateArgument> & 121bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Deduced, 122bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl unsigned TDF, 123bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl bool PartialOrdering = false, 124bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl SmallVectorImpl<RefParamPartialOrderingComparison> * 125b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons = 0); 126603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 127603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregorstatic Sema::TemplateDeductionResult 128603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas GregorDeduceTemplateArguments(Sema &S, 129603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateParameterList *TemplateParams, 13020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Params, unsigned NumParams, 13120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Args, unsigned NumArgs, 13220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateDeductionInfo &Info, 1335f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 1340972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor bool NumberOfArgumentsMustMatch = true); 13520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 136199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// \brief If the given expression is of a form that permits the deduction 137199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// of a non-type template parameter, return the declaration of that 138199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// non-type template parameter. 139199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregorstatic NonTypeTemplateParmDecl *getDeducedParameterFromExpr(Expr *E) { 1405a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith // If we are within an alias template, the expression may have undergone 1415a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith // any number of parameter substitutions already. 1425a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith while (1) { 1435a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith if (ImplicitCastExpr *IC = dyn_cast<ImplicitCastExpr>(E)) 1445a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith E = IC->getSubExpr(); 1455a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith else if (SubstNonTypeTemplateParmExpr *Subst = 1465a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith dyn_cast<SubstNonTypeTemplateParmExpr>(E)) 1475a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith E = Subst->getReplacement(); 1485a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith else 1495a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith break; 1505a343d7856e5de04fd92b6192e94becddf541e3eRichard Smith } 1511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 152199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 153199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor return dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); 1541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 155199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor return 0; 156199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor} 157199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1580d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// \brief Determine whether two declaration pointers refer to the same 1590d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// declaration. 1600d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregorstatic bool isSameDeclaration(Decl *X, Decl *Y) { 1610d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (!X || !Y) 1620d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return !X && !Y; 163dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1640d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (NamedDecl *NX = dyn_cast<NamedDecl>(X)) 1650d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X = NX->getUnderlyingDecl(); 1660d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (NamedDecl *NY = dyn_cast<NamedDecl>(Y)) 1670d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y = NY->getUnderlyingDecl(); 168dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1690d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X->getCanonicalDecl() == Y->getCanonicalDecl(); 1700d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor} 1710d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 1720d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// \brief Verify that the given, deduced template arguments are compatible. 1730d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// 1740d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// \returns The deduced template argument, or a NULL template argument if 1750d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// the deduced template arguments were incompatible. 176dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic DeducedTemplateArgument 1770d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas GregorcheckDeducedTemplateArguments(ASTContext &Context, 1780d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor const DeducedTemplateArgument &X, 1790d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor const DeducedTemplateArgument &Y) { 1800d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // We have no deduction for one or both of the arguments; they're compatible. 1810d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (X.isNull()) 1820d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return Y; 1830d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.isNull()) 184dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return X; 1850d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 1860d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor switch (X.getKind()) { 1870d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Null: 1880d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor llvm_unreachable("Non-deduced template arguments handled above"); 1890d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 1900d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Type: 1910d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If two template type arguments have the same type, they're compatible. 1920d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Type && 1930d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Context.hasSameType(X.getAsType(), Y.getAsType())) 1940d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 195dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1960d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 197dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1980d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Integral: 1990d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced a constant in one case and either a dependent expression or 2000d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // declaration in another case, keep the integral constant. 2010d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If both are integral constants with the same value, keep that value. 2020d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Expression || 2030d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.getKind() == TemplateArgument::Declaration || 2040d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor (Y.getKind() == TemplateArgument::Integral && 205855243789cb44799c03f4c7216d3d6308805f549Benjamin Kramer hasSameExtendedValue(X.getAsIntegral(), Y.getAsIntegral()))) 206dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeducedTemplateArgument(X, 2070d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X.wasDeducedFromArrayBound() && 2080d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.wasDeducedFromArrayBound()); 2090d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 2100d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 2110d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 212dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2130d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Template: 2140d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Template && 2150d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Context.hasSameTemplateName(X.getAsTemplate(), Y.getAsTemplate())) 2160d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 217dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2180d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 219dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeducedTemplateArgument(); 220a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 221a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 222a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor if (Y.getKind() == TemplateArgument::TemplateExpansion && 223dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Context.hasSameTemplateName(X.getAsTemplateOrTemplatePattern(), 224a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Y.getAsTemplateOrTemplatePattern())) 225a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor return X; 226dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 227a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor // All other combinations are incompatible. 228dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeducedTemplateArgument(); 229a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 2300d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Expression: 231dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we deduced a dependent expression in one case and either an integral 232dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // constant or a declaration in another case, keep the integral constant 2330d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // or declaration. 2340d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Integral || 2350d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.getKind() == TemplateArgument::Declaration) 2360d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(Y, X.wasDeducedFromArrayBound() && 2370d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.wasDeducedFromArrayBound()); 238dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2390d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Expression) { 2400d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // Compare the expressions for equality 2410d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor llvm::FoldingSetNodeID ID1, ID2; 2420d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X.getAsExpr()->Profile(ID1, Context, true); 2430d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.getAsExpr()->Profile(ID2, Context, true); 2440d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (ID1 == ID2) 2450d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 2460d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor } 247dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2480d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 2490d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 250dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2510d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Declaration: 2520d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced a declaration and a dependent expression, keep the 2530d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // declaration. 2540d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Expression) 2550d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 256dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2570d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced a declaration and an integral constant, keep the 2580d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // integral constant. 2590d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Integral) 2600d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return Y; 261dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2620d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced two declarations, make sure they they refer to the 2630d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // same declaration. 2640d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Declaration && 2650d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor isSameDeclaration(X.getAsDecl(), Y.getAsDecl())) 2660d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 267dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2680d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 2690d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 270dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2710d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Pack: 2720d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() != TemplateArgument::Pack || 2730d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X.pack_size() != Y.pack_size()) 2740d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 275dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 276dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (TemplateArgument::pack_iterator XA = X.pack_begin(), 2770d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor XAEnd = X.pack_end(), 2780d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor YA = Y.pack_begin(); 2790d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor XA != XAEnd; ++XA, ++YA) { 280dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (checkDeducedTemplateArguments(Context, 281dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument(*XA, X.wasDeducedFromArrayBound()), 282135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor DeducedTemplateArgument(*YA, Y.wasDeducedFromArrayBound())) 283135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor .isNull()) 2840d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 2850d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor } 286dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2870d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 2880d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor } 289dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2903026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid TemplateArgument Kind!"); 2910d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor} 2920d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 2931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Deduce the value of the given non-type template parameter 294199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// from the given constant. 295f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 296a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceNonTypeTemplateArgument(Sema &S, 2971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NonTypeTemplateParmDecl *NTTP, 2989d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor llvm::APSInt Value, QualType ValueType, 29902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor bool DeducedFromArrayBound, 3002a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3015f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 3021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 303199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument with depth > 0"); 3041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 305855243789cb44799c03f4c7216d3d6308805f549Benjamin Kramer DeducedTemplateArgument NewDeduced(S.Context, Value, ValueType, 306855243789cb44799c03f4c7216d3d6308805f549Benjamin Kramer DeducedFromArrayBound); 307dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 3080d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()], 3090d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 3100d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 311f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.Param = NTTP; 312f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Deduced[NTTP->getIndex()]; 3130d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 314dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 315f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 316dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3170d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()] = Result; 318f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 319199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor} 320199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 3211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Deduce the value of the given non-type template parameter 322199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// from the given type- or value-dependent expression. 323199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// 324199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// \returns true if deduction succeeded, false otherwise. 325f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 326a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceNonTypeTemplateArgument(Sema &S, 327f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor NonTypeTemplateParmDecl *NTTP, 328f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Expr *Value, 3292a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3305f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 3311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 332199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument with depth > 0"); 333199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor assert((Value->isTypeDependent() || Value->isValueDependent()) && 334199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Expression template argument must be type- or value-dependent."); 3351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3360d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(Value); 337dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 338dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Deduced[NTTP->getIndex()], 3390d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 340dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3410d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 3420d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = NTTP; 3430d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[NTTP->getIndex()]; 3440d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 345dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 3469eea08ba72f8b1e7faf38e43376b9157fc4a2af2Douglas Gregor } 347dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3480d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()] = Result; 349f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 350199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor} 351199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 35215755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// \brief Deduce the value of the given non-type template parameter 35315755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// from the given declaration. 35415755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// 35515755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// \returns true if deduction succeeded, false otherwise. 35615755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregorstatic Sema::TemplateDeductionResult 357a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceNonTypeTemplateArgument(Sema &S, 35815755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor NonTypeTemplateParmDecl *NTTP, 35915755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor Decl *D, 3602a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3615f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 36215755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor assert(NTTP->getDepth() == 0 && 36315755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor "Cannot deduce non-type template argument with depth > 0"); 364dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3650d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(D? D->getCanonicalDecl() : 0); 366dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 3670d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()], 3680d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 3690d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 3700d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = NTTP; 3710d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[NTTP->getIndex()]; 3720d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 373dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 37415755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor } 375dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3760d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()] = Result; 37715755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor return Sema::TDK_Success; 37815755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor} 37915755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor 380f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 381a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 382db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor TemplateParameterList *TemplateParams, 383f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateName Param, 384f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateName Arg, 3852a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3865f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 387d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor TemplateDecl *ParamDecl = Param.getAsTemplateDecl(); 388db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (!ParamDecl) { 389db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // The parameter type is dependent and is not a template template parameter, 390db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // so there is nothing that we can deduce. 391db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor return Sema::TDK_Success; 392f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 393dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 394db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (TemplateTemplateParmDecl *TempParam 395db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor = dyn_cast<TemplateTemplateParmDecl>(ParamDecl)) { 3960d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(S.Context.getCanonicalTemplateName(Arg)); 397dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 3980d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[TempParam->getIndex()], 3990d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 4000d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 4010d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = TempParam; 4020d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[TempParam->getIndex()]; 4030d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 404dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 405db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor } 406dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4070d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[TempParam->getIndex()] = Result; 408dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Success; 409f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 410dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 411db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // Verify that the two template names are equivalent. 412a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth if (S.Context.hasSameTemplateName(Param, Arg)) 413db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor return Sema::TDK_Success; 414dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 415db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // Mismatch of non-dependent template parameter to argument. 416db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Info.FirstArg = TemplateArgument(Param); 417db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Info.SecondArg = TemplateArgument(Arg); 418db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor return Sema::TDK_NonDeducedMismatch; 419d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor} 420d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 4211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Deduce the template arguments by comparing the template parameter 422de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// type (which is a template-id) with the template argument type. 423de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 424a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth/// \param S the Sema 425de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 426de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param TemplateParams the template parameters that we are deducing 427de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 428de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Param the parameter type 429de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 430de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Arg the argument type 431de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 432de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Info information about the template argument deduction itself 433de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 434de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Deduced the deduced template arguments 435de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 436de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \returns the result of template argument deduction so far. Note that a 437de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// "success" result means that template argument deduction has not yet failed, 438de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// but it may still fail, later, for other reasons. 439de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregorstatic Sema::TemplateDeductionResult 440a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 441de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor TemplateParameterList *TemplateParams, 442de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const TemplateSpecializationType *Param, 443de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor QualType Arg, 4442a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 4455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 446467b27b9a24bdc823218ad1ad0e37673b6cc1e83John McCall assert(Arg.isCanonical() && "Argument type must be canonical"); 4471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 448de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Check whether the template argument is a dependent template-id. 4491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateSpecializationType *SpecArg 450de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor = dyn_cast<TemplateSpecializationType>(Arg)) { 451de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Perform template argument deduction for the template name. 452de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Sema::TemplateDeductionResult Result 453a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 454de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Param->getTemplateName(), 455de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor SpecArg->getTemplateName(), 456de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced)) 457de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 4581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 460de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Perform template argument deduction on each template 4610972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor // argument. Ignore any missing/extra arguments, since they could be 4620972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor // filled in by default arguments. 463dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 464dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Param->getArgs(), Param->getNumArgs(), 4650972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor SpecArg->getArgs(), SpecArg->getNumArgs(), 4660972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor Info, Deduced, 4670972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor /*NumberOfArgumentsMustMatch=*/false); 468de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 4691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 470de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If the argument type is a class template specialization, we 471de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // perform template argument deduction using its template 472de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // arguments. 473de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const RecordType *RecordArg = dyn_cast<RecordType>(Arg); 474de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!RecordArg) 475de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_NonDeducedMismatch; 4761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump ClassTemplateSpecializationDecl *SpecArg 478de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor = dyn_cast<ClassTemplateSpecializationDecl>(RecordArg->getDecl()); 479de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!SpecArg) 480de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_NonDeducedMismatch; 4811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 482de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Perform template argument deduction for the template name. 483de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Sema::TemplateDeductionResult Result 484a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, 485db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor TemplateParams, 486de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Param->getTemplateName(), 487de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor TemplateName(SpecArg->getSpecializedTemplate()), 488de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced)) 489de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 4901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 49120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Perform template argument deduction for the template arguments. 492dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 49320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Param->getArgs(), Param->getNumArgs(), 49420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor SpecArg->getTemplateArgs().data(), 49520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor SpecArg->getTemplateArgs().size(), 49620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Info, Deduced); 497de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor} 498de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor 499cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall/// \brief Determines whether the given type is an opaque type that 500cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall/// might be more qualified when instantiated. 501cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCallstatic bool IsPossiblyOpaquelyQualifiedType(QualType T) { 502cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall switch (T->getTypeClass()) { 503cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::TypeOfExpr: 504cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::TypeOf: 505cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::DependentName: 506cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::Decltype: 507cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::UnresolvedUsing: 50862c28c831bbf207cc36e683e7c321fc33bf8928cJohn McCall case Type::TemplateTypeParm: 509cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall return true; 510cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall 511cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::ConstantArray: 512cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::IncompleteArray: 513cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::VariableArray: 514cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::DependentSizedArray: 515cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall return IsPossiblyOpaquelyQualifiedType( 516cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall cast<ArrayType>(T)->getElementType()); 517cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall 518cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall default: 519cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall return false; 520cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall } 521cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall} 522cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall 523d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor/// \brief Retrieve the depth and index of a template parameter. 524dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic std::pair<unsigned, unsigned> 525d3731198193eee92796ddeb493973b7a598b003eDouglas GregorgetDepthAndIndex(NamedDecl *ND) { 526603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(ND)) 527603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return std::make_pair(TTP->getDepth(), TTP->getIndex()); 528dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 529603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(ND)) 530603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return std::make_pair(NTTP->getDepth(), NTTP->getIndex()); 531dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 532603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(ND); 533603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return std::make_pair(TTP->getDepth(), TTP->getIndex()); 534603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor} 535603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 536d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor/// \brief Retrieve the depth and index of an unexpanded parameter pack. 537dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic std::pair<unsigned, unsigned> 538d3731198193eee92796ddeb493973b7a598b003eDouglas GregorgetDepthAndIndex(UnexpandedParameterPack UPP) { 539d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (const TemplateTypeParmType *TTP 540d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor = UPP.first.dyn_cast<const TemplateTypeParmType *>()) 541d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor return std::make_pair(TTP->getDepth(), TTP->getIndex()); 542dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 543d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor return getDepthAndIndex(UPP.first.get<NamedDecl *>()); 544d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor} 545d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor 546603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \brief Helper function to build a TemplateParameter when we don't 547603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// know its type statically. 548603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregorstatic TemplateParameter makeTemplateParameter(Decl *D) { 549603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(D)) 550603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return TemplateParameter(TTP); 551603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor else if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) 552603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return TemplateParameter(NTTP); 553dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 554603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return TemplateParameter(cast<TemplateTemplateParmDecl>(D)); 555603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor} 556603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 5575429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor/// \brief Prepare to perform template argument deduction for all of the 5585429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor/// arguments in a set of argument packs. 559dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic void PrepareArgumentPackDeduction(Sema &S, 5605f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 5614fe5be028b723fedc28bb33be96cde1ab2574ee6Bill Wendling ArrayRef<unsigned> PackIndices, 5625f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, 5635f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl< 5645f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> > &NewlyDeducedPacks) { 5655429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // Save the deduced template arguments for each parameter pack expanded 5665429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // by this pack expansion, then clear out the deduction. 5675429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 5685429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // Save the previously-deduced argument pack, then clear it out so that we 5695429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // can deduce a new argument pack. 5705429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor SavedPacks[I] = Deduced[PackIndices[I]]; 571dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Deduced[PackIndices[I]] = TemplateArgument(); 572dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5735429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // If the template arugment pack was explicitly specified, add that to 5745429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // the set of deduced arguments. 5755429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor const TemplateArgument *ExplicitArgs; 5765429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor unsigned NumExplicitArgs; 577dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NamedDecl *PartiallySubstitutedPack 5785429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor = S.CurrentInstantiationScope->getPartiallySubstitutedPack( 5795429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor &ExplicitArgs, 5805429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor &NumExplicitArgs)) { 5815429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor if (getDepthAndIndex(PartiallySubstitutedPack).second == PackIndices[I]) 582dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks[I].append(ExplicitArgs, 5835429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor ExplicitArgs + NumExplicitArgs); 5845429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor } 5855429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor } 5865429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor} 5875429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor 5880216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor/// \brief Finish template argument deduction for a set of argument packs, 5890216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor/// producing the argument packs and checking for consistency with prior 5900216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor/// deductions. 5910216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregorstatic Sema::TemplateDeductionResult 5920216f8121df32b320cab659d5b703fee50cdfda5Douglas GregorFinishArgumentPackDeduction(Sema &S, 5930216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor TemplateParameterList *TemplateParams, 5940216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor bool HasAnyArguments, 5955f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 596341785ec52f87c0803ba52dc88faac4e136f8593Bill Wendling ArrayRef<unsigned> PackIndices, 5975f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, 5985f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl< 5995f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> > &NewlyDeducedPacks, 6000216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor TemplateDeductionInfo &Info) { 6010216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 6020216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // pack expansion. 6030216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 6040216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (HasAnyArguments && NewlyDeducedPacks[I].empty()) { 6050216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // We were not able to deduce anything for this parameter pack, 6060216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // so just restore the saved argument pack. 6070216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced[PackIndices[I]] = SavedPacks[I]; 6080216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor continue; 6090216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 610dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6110216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor DeducedTemplateArgument NewPack; 612dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6130216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (NewlyDeducedPacks[I].empty()) { 6140216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // If we deduced an empty argument pack, create it now. 6150216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewPack = DeducedTemplateArgument(TemplateArgument(0, 0)); 6160216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } else { 6170216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor TemplateArgument *ArgumentPack 618203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor = new (S.Context) TemplateArgument [NewlyDeducedPacks[I].size()]; 6190216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor std::copy(NewlyDeducedPacks[I].begin(), NewlyDeducedPacks[I].end(), 6200216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor ArgumentPack); 6210216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewPack 622203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor = DeducedTemplateArgument(TemplateArgument(ArgumentPack, 623203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor NewlyDeducedPacks[I].size()), 624dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks[I][0].wasDeducedFromArrayBound()); 6250216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 626dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6270216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor DeducedTemplateArgument Result 6280216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor = checkDeducedTemplateArguments(S.Context, SavedPacks[I], NewPack); 6290216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Result.isNull()) { 6300216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Info.Param 6310216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor = makeTemplateParameter(TemplateParams->getParam(PackIndices[I])); 6320216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Info.FirstArg = SavedPacks[I]; 6330216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Info.SecondArg = NewPack; 6340216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor return Sema::TDK_Inconsistent; 6350216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 636dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6370216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced[PackIndices[I]] = Result; 6380216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 639dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6400216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor return Sema::TDK_Success; 6410216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor} 6420216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor 643603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \brief Deduce the template arguments by comparing the list of parameter 644dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// types to the list of argument types, as in the parameter-type-lists of 645dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// function types (C++ [temp.deduct.type]p10). 646603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 647603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param S The semantic analysis object within which we are deducing 648603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 649603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param TemplateParams The template parameters that we are deducing 650603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 651603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Params The list of parameter types 652603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 653603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param NumParams The number of types in \c Params 654603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 655603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Args The list of argument types 656603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 657603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param NumArgs The number of types in \c Args 658603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 659603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Info information about the template argument deduction itself 660603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 661603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Deduced the deduced template arguments 662603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 663603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe 664603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// how template argument deduction is performed. 665603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 6665c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param PartialOrdering If true, we are performing template argument 667dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// deduction for during partial ordering for a call 6685c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// (C++0x [temp.deduct.partial]). 6695c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 670b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \param RefParamComparisons If we're performing template argument deduction 6715c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering, the set of qualifier comparisons. 6725c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 673603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \returns the result of template argument deduction so far. Note that a 674603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// "success" result means that template argument deduction has not yet failed, 675603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// but it may still fail, later, for other reasons. 676603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregorstatic Sema::TemplateDeductionResult 677603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas GregorDeduceTemplateArguments(Sema &S, 678603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateParameterList *TemplateParams, 679603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor const QualType *Params, unsigned NumParams, 680603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor const QualType *Args, unsigned NumArgs, 681603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateDeductionInfo &Info, 6825f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 6835c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned TDF, 6845c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool PartialOrdering = false, 6855f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<RefParamPartialOrderingComparison> * 686b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons = 0) { 6870bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor // Fast-path check to see if we have too many/too few arguments. 6880bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor if (NumParams != NumArgs && 6890bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor !(NumParams && isa<PackExpansionType>(Params[NumParams - 1])) && 6900bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor !(NumArgs && isa<PackExpansionType>(Args[NumArgs - 1]))) 6913cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 692dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 693603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // C++0x [temp.deduct.type]p10: 694dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Similarly, if P has a form that contains (T), then each parameter type 695dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Pi of the respective parameter-type- list of P is compared with the 696dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // corresponding parameter type Ai of the corresponding parameter-type-list 697dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // of A. [...] 698603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor unsigned ArgIdx = 0, ParamIdx = 0; 699603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (; ParamIdx != NumParams; ++ParamIdx) { 700603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Check argument types. 701dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const PackExpansionType *Expansion 702603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor = dyn_cast<PackExpansionType>(Params[ParamIdx]); 703603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (!Expansion) { 704603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Simple case: compare the parameter and argument types at this point. 705dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 706603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Make sure we have an argument. 707603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (ArgIdx >= NumArgs) 7083cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 709dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 71077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (isa<PackExpansionType>(Args[ArgIdx])) { 71177d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // C++0x [temp.deduct.type]p22: 71277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the original function parameter associated with A is a function 71377d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // parameter pack and the function parameter associated with P is not 71477d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // a function parameter pack, then template argument deduction fails. 71577d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor return Sema::TDK_NonDeducedMismatch; 71677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor } 717dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 718603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (Sema::TemplateDeductionResult Result 719bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 720bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Params[ParamIdx], Args[ArgIdx], 721bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF, 722bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl PartialOrdering, 723bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons)) 724603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Result; 725dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 726603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor ++ArgIdx; 727603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor continue; 728603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 729dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 7307d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // C++0x [temp.deduct.type]p5: 7317d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // The non-deduced contexts are: 732dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - A function parameter pack that does not occur at the end of the 7337d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // parameter-declaration-clause. 7347d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor if (ParamIdx + 1 < NumParams) 7357d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor return Sema::TDK_Success; 7367d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor 737603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // C++0x [temp.deduct.type]p10: 738dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the parameter-declaration corresponding to Pi is a function 739603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // parameter pack, then the type of its declarator- id is compared with 740dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // each remaining parameter type in the parameter-type-list of A. Each 741603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // comparison deduces template arguments for subsequent positions in the 742603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // template parameter packs expanded by the function parameter pack. 743dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 744603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Compute the set of template parameter indices that correspond to 745603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // parameter packs expanded by the pack expansion. 7465f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<unsigned, 2> PackIndices; 747603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor QualType Pattern = Expansion->getPattern(); 748603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor { 749013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector SawIndices(TemplateParams->size()); 7505f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UnexpandedParameterPack, 2> Unexpanded; 751603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor S.collectUnexpandedParameterPacks(Pattern, Unexpanded); 752603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 753603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor unsigned Depth, Index; 754603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 755603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 756603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor SawIndices[Index] = true; 757603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor PackIndices.push_back(Index); 758603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 759603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 760603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 761603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 762603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 763d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Keep track of the deduced template arguments for each parameter pack 764dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 765d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template argument (the inner SmallVectors). 7665f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> 767d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 7685f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 2> 7695429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor SavedPacks(PackIndices.size()); 770dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, 7715429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks); 772dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 773603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor bool HasAnyArguments = false; 774603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (; ArgIdx < NumArgs; ++ArgIdx) { 775603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor HasAnyArguments = true; 776dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 777603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Deduce template arguments from the pattern. 778dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (Sema::TemplateDeductionResult Result 779bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, Pattern, 780bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Args[ArgIdx], Info, Deduced, 781bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TDF, PartialOrdering, 782bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons)) 783603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Result; 784dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 785603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 786603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 787603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // for that pack, then clear out the deduced argument. 788603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 789603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 790603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (!DeducedArg.isNull()) { 791603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 792603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor DeducedArg = DeducedTemplateArgument(); 793603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 794603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 795603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 796dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 797603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 798603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // pack expansion. 7990216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 800dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(S, TemplateParams, HasAnyArguments, 8010216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 8020216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 803dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 804603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 805dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 806603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Make sure we don't have any extra arguments. 807603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (ArgIdx < NumArgs) 8083cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 809dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 810603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Sema::TDK_Success; 811603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor} 812603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 81361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor/// \brief Determine whether the parameter has qualifiers that are either 81461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor/// inconsistent with or a superset of the argument's qualifiers. 81561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregorstatic bool hasInconsistentOrSupersetQualifiersOf(QualType ParamType, 81661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor QualType ArgType) { 81761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ParamQs = ParamType.getQualifiers(); 81861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ArgQs = ArgType.getQualifiers(); 81961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 82061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs == ArgQs) 82161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return false; 82261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 82361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Mismatched (but not missing) Objective-C GC attributes. 82461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.getObjCGCAttr() != ArgQs.getObjCGCAttr() && 82561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ParamQs.hasObjCGCAttr()) 82661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return true; 82761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 82861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Mismatched (but not missing) address spaces. 82961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.getAddressSpace() != ArgQs.getAddressSpace() && 83061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ParamQs.hasAddressSpace()) 83161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return true; 83261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 833f85e193739c953358c865005855253af4f68a497John McCall // Mismatched (but not missing) Objective-C lifetime qualifiers. 834f85e193739c953358c865005855253af4f68a497John McCall if (ParamQs.getObjCLifetime() != ArgQs.getObjCLifetime() && 835f85e193739c953358c865005855253af4f68a497John McCall ParamQs.hasObjCLifetime()) 836f85e193739c953358c865005855253af4f68a497John McCall return true; 837f85e193739c953358c865005855253af4f68a497John McCall 83861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // CVR qualifier superset. 83961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return (ParamQs.getCVRQualifiers() != ArgQs.getCVRQualifiers()) && 84061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ((ParamQs.getCVRQualifiers() | ArgQs.getCVRQualifiers()) 84161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor == ParamQs.getCVRQualifiers()); 84261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor} 84361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 844500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \brief Deduce the template arguments by comparing the parameter type and 845500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// the argument type (C++ [temp.deduct.type]). 846500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 847a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth/// \param S the semantic analysis object within which we are deducing 848500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 849500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param TemplateParams the template parameters that we are deducing 850500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 851500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param ParamIn the parameter type 852500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 853500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param ArgIn the argument type 854500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 855500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param Info information about the template argument deduction itself 856500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 857500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param Deduced the deduced template arguments 858500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 859508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor/// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe 8601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// how template argument deduction is performed. 861500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 8625c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param PartialOrdering Whether we're performing template argument deduction 8635c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering (C++0x [temp.deduct.partial]). 8645c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 865b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \param RefParamComparisons If we're performing template argument deduction 8665c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering, the set of qualifier comparisons. 8675c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 868500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \returns the result of template argument deduction so far. Note that a 869500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// "success" result means that template argument deduction has not yet failed, 870500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// but it may still fail, later, for other reasons. 871f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 872bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian RedlDeduceTemplateArgumentsByTypeMatch(Sema &S, 873bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TemplateParameterList *TemplateParams, 874bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl QualType ParamIn, QualType ArgIn, 875bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TemplateDeductionInfo &Info, 876bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl SmallVectorImpl<DeducedTemplateArgument> &Deduced, 877bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl unsigned TDF, 878bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl bool PartialOrdering, 879bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl SmallVectorImpl<RefParamPartialOrderingComparison> * 880bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons) { 8810b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // We only want to look at the canonical types, since typedefs and 8820b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // sugar are not part of template argument deduction. 883a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth QualType Param = S.Context.getCanonicalType(ParamIn); 884a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth QualType Arg = S.Context.getCanonicalType(ArgIn); 8850b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 88677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the argument type is a pack expansion, look at its pattern. 887dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // This isn't explicitly called out 88877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (const PackExpansionType *ArgExpansion 88977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor = dyn_cast<PackExpansionType>(Arg)) 89077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Arg = ArgExpansion->getPattern(); 891dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 8925c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (PartialOrdering) { 8935c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p5: 894dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Before the partial ordering is done, certain transformations are 895dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // performed on the types used for partial ordering: 896dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If P is a reference type, P is replaced by the type referred to. 8975c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor const ReferenceType *ParamRef = Param->getAs<ReferenceType>(); 8985c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (ParamRef) 8995c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = ParamRef->getPointeeType(); 900dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9015c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // - If A is a reference type, A is replaced by the type referred to. 9025c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor const ReferenceType *ArgRef = Arg->getAs<ReferenceType>(); 9035c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (ArgRef) 9045c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Arg = ArgRef->getPointeeType(); 905dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 906b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (RefParamComparisons && ParamRef && ArgRef) { 9075c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p6: 908dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If both P and A were reference types (before being replaced with the 909dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // type referred to above), determine which of the two types (if any) is 9105c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // more cv-qualified than the other; otherwise the types are considered 911dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // to be equally cv-qualified for partial ordering purposes. The result 9125c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // of this determination will be used below. 9135c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // 914dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // We save this information for later, using it only when deduction 9155c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // succeeds in both directions. 916b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamPartialOrderingComparison Comparison; 917b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.ParamIsRvalueRef = ParamRef->getAs<RValueReferenceType>(); 918b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.ArgIsRvalueRef = ArgRef->getAs<RValueReferenceType>(); 919b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = NeitherMoreQualified; 920769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor 921769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor Qualifiers ParamQuals = Param.getQualifiers(); 922769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor Qualifiers ArgQuals = Arg.getQualifiers(); 923769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor if (ParamQuals.isStrictSupersetOf(ArgQuals)) 924b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = ParamMoreQualified; 925769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor else if (ArgQuals.isStrictSupersetOf(ParamQuals)) 926b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = ArgMoreQualified; 927b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons->push_back(Comparison); 9285c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } 929dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9305c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p7: 9315c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // Remove any top-level cv-qualifiers: 932dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If P is a cv-qualified type, P is replaced by the cv-unqualified 9335c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // version of P. 9345c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = Param.getUnqualifiedType(); 935dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If A is a cv-qualified type, A is replaced by the cv-unqualified 9365c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // version of A. 9375c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Arg = Arg.getUnqualifiedType(); 9385c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } else { 9395c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.call]p4 bullet 1: 9405c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // - If the original P is a reference type, the deduced A (i.e., the type 9415c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // referred to by the reference) can be more cv-qualified than the 9425c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // transformed A. 9435c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (TDF & TDF_ParamWithReferenceType) { 9445c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Qualifiers Quals; 9455c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor QualType UnqualParam = S.Context.getUnqualifiedArrayType(Param, Quals); 9465c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Quals.setCVRQualifiers(Quals.getCVRQualifiers() & 94762c28c831bbf207cc36e683e7c321fc33bf8928cJohn McCall Arg.getCVRQualifiers()); 9485c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = S.Context.getQualifiedType(UnqualParam, Quals); 9495c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } 950dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 95173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if ((TDF & TDF_TopLevelParameterTypeList) && !Param->isFunctionType()) { 95273b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // C++0x [temp.deduct.type]p10: 95373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // If P and A are function types that originated from deduction when 95473b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // taking the address of a function template (14.8.2.2) or when deducing 95573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // template arguments from a function declaration (14.8.2.6) and Pi and 956dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Ai are parameters of the top-level parameter-type-list of P and A, 957dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // respectively, Pi is adjusted if it is an rvalue reference to a 958dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // cv-unqualified template parameter and Ai is an lvalue reference, in 959dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // which case the type of Pi is changed to be the template parameter 96073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // type (i.e., T&& is changed to simply T). [ Note: As a result, when 96173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // Pi is T&& and Ai is X&, the adjusted Pi will be T, causing T to be 9620099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // deduced as X&. - end note ] 96373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF &= ~TDF_TopLevelParameterTypeList; 964dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 96573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (const RValueReferenceType *ParamRef 96673b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor = Param->getAs<RValueReferenceType>()) { 96773b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (isa<TemplateTypeParmType>(ParamRef->getPointeeType()) && 96873b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor !ParamRef->getPointeeType().getQualifiers()) 96973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (Arg->isLValueReferenceType()) 97073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Param = ParamRef->getPointeeType(); 97173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor } 97273b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor } 973500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor } 974dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 975199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // C++ [temp.deduct.type]p9: 9761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // A template type argument T, a template template argument TT or a 9771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // template non-type argument i can be deduced if P and A have one of 978199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // the following forms: 979199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // 980199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T 981199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // cv-list T 9821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateTypeParmType *TemplateTypeParm 983183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Param->getAs<TemplateTypeParmType>()) { 984af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor // Just skip any attempts to deduce from a placeholder type. 985af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor if (Arg->isPlaceholderType()) 986af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor return Sema::TDK_Success; 987af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor 988f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor unsigned Index = TemplateTypeParm->getIndex(); 989f290e0db835a619014538c41ed552696efc0e977Douglas Gregor bool RecanonicalizeArg = false; 9901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9919e9fae4b8af47c15696da4ea3c30102e3a035179Douglas Gregor // If the argument type is an array type, move the qualifiers up to the 9929e9fae4b8af47c15696da4ea3c30102e3a035179Douglas Gregor // top level, so they can be matched with the qualifiers on the parameter. 993f290e0db835a619014538c41ed552696efc0e977Douglas Gregor if (isa<ArrayType>(Arg)) { 9940953e767ff7817f97b3ab20896b229891eeff45bJohn McCall Qualifiers Quals; 995a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth Arg = S.Context.getUnqualifiedArrayType(Arg, Quals); 9960953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (Quals) { 997a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth Arg = S.Context.getQualifiedType(Arg, Quals); 998f290e0db835a619014538c41ed552696efc0e977Douglas Gregor RecanonicalizeArg = true; 999f290e0db835a619014538c41ed552696efc0e977Douglas Gregor } 1000f290e0db835a619014538c41ed552696efc0e977Douglas Gregor } 10011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10020b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // The argument type can not be less qualified than the parameter 10030b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // type. 100461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (!(TDF & TDF_IgnoreQualifiers) && 100561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor hasInconsistentOrSupersetQualifiersOf(Param, Arg)) { 1006f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 100757e97786433e70197a089360228d8f0d82e3ad4cJohn McCall Info.FirstArg = TemplateArgument(Param); 1008833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.SecondArg = TemplateArgument(Arg); 100957e97786433e70197a089360228d8f0d82e3ad4cJohn McCall return Sema::TDK_Underqualified; 1010f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 10110b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 10120b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor assert(TemplateTypeParm->getDepth() == 0 && "Can't deduce with depth > 0"); 1013a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth assert(Arg != S.Context.OverloadTy && "Unresolved overloaded function"); 10140953e767ff7817f97b3ab20896b229891eeff45bJohn McCall QualType DeducedType = Arg; 101549f4e1cbd839da27ff4814b4ea6d85a79f786cbdJohn McCall 101661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Remove any qualifiers on the parameter from the deduced type. 101761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // We checked the qualifiers for consistency above. 101861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers DeducedQs = DeducedType.getQualifiers(); 101961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ParamQs = Param.getQualifiers(); 102061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeCVRQualifiers(ParamQs.getCVRQualifiers()); 102161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.hasObjCGCAttr()) 102261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeObjCGCAttr(); 102361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.hasAddressSpace()) 102461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeAddressSpace(); 1025f85e193739c953358c865005855253af4f68a497John McCall if (ParamQs.hasObjCLifetime()) 1026f85e193739c953358c865005855253af4f68a497John McCall DeducedQs.removeObjCLifetime(); 1027e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor 1028e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor // Objective-C ARC: 1029da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor // If template deduction would produce a lifetime qualifier on a type 1030da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor // that is not a lifetime type, template argument deduction fails. 1031da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor if (ParamQs.hasObjCLifetime() && !DeducedType->isObjCLifetimeType() && 1032da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor !DeducedType->isDependentType()) { 1033da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 1034da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor Info.FirstArg = TemplateArgument(Param); 1035da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor Info.SecondArg = TemplateArgument(Arg); 1036da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor return Sema::TDK_Underqualified; 1037da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor } 1038da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor 1039da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor // Objective-C ARC: 1040e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor // If template deduction would produce an argument type with lifetime type 1041e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor // but no lifetime qualifier, the __strong lifetime qualifier is inferred. 10424e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (S.getLangOpts().ObjCAutoRefCount && 1043e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor DeducedType->isObjCLifetimeType() && 1044e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor !DeducedQs.hasObjCLifetime()) 1045e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor DeducedQs.setObjCLifetime(Qualifiers::OCL_Strong); 1046e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor 104761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedType = S.Context.getQualifiedType(DeducedType.getUnqualifiedType(), 104861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs); 104961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 1050f290e0db835a619014538c41ed552696efc0e977Douglas Gregor if (RecanonicalizeArg) 1051a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth DeducedType = S.Context.getCanonicalType(DeducedType); 10521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10530d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(DeducedType); 1054dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 10550d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[Index], 10560d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 10570d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 10580d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 10590d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[Index]; 10600d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 1061dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 10620b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 1063dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10640d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[Index] = Result; 1065dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Success; 10660b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 10670b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1068f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor // Set up the template argument deduction information for a failure. 1069833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.FirstArg = TemplateArgument(ParamIn); 1070833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.SecondArg = TemplateArgument(ArgIn); 1071f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 10720bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // If the parameter is an already-substituted template parameter 10730bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // pack, do nothing: we don't know which of its arguments to look 10740bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // at, so we have to wait until all of the parameter packs in this 10750bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // expansion have arguments. 10760bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor if (isa<SubstTemplateTypeParmPackType>(Param)) 10770bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor return Sema::TDK_Success; 10780bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor 1079508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor // Check the cv-qualifiers on the parameter and argument types. 1080508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (!(TDF & TDF_IgnoreQualifiers)) { 1081508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (TDF & TDF_ParamWithReferenceType) { 108261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (hasInconsistentOrSupersetQualifiersOf(Param, Arg)) 1083508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1084cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall } else if (!IsPossiblyOpaquelyQualifiedType(Param)) { 1085508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (Param.getCVRQualifiers() != Arg.getCVRQualifiers()) 10861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Sema::TDK_NonDeducedMismatch; 1087508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor } 1088fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor 1089fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor // If the parameter type is not dependent, there is nothing to deduce. 1090fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor if (!Param->isDependentType()) { 1091fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor if (!(TDF & TDF_SkipNonDependent) && Param != Arg) 1092fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1093fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor 1094fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor return Sema::TDK_Success; 1095fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor } 1096fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor } else if (!Param->isDependentType() && 1097fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor Param.getUnqualifiedType() == Arg.getUnqualifiedType()) { 1098fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor return Sema::TDK_Success; 1099508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor } 11000b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1101d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor switch (Param->getTypeClass()) { 11024ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Non-canonical types cannot appear here. 11034ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor#define NON_CANONICAL_TYPE(Class, Base) \ 11044ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Class: llvm_unreachable("deducing non-canonical type: " #Class); 11054ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor#define TYPE(Class, Base) 11064ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor#include "clang/AST/TypeNodes.def" 11074ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 11084ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::TemplateTypeParm: 11094ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::SubstTemplateTypeParmPack: 11104ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor llvm_unreachable("Type nodes handled above"); 1111fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor 1112fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor // These types cannot be dependent, so simply check whether the types are 1113fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor // the same. 1114199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case Type::Builtin: 11154ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::VariableArray: 11164ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Vector: 11174ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::FunctionNoProto: 11184ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Record: 11194ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Enum: 11204ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ObjCObject: 11214ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ObjCInterface: 1122fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor case Type::ObjCObjectPointer: { 1123fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor if (TDF & TDF_SkipNonDependent) 1124fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor return Sema::TDK_Success; 1125fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor 1126fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor if (TDF & TDF_IgnoreQualifiers) { 1127fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor Param = Param.getUnqualifiedType(); 1128fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor Arg = Arg.getUnqualifiedType(); 1129fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor } 1130fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor 1131fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor return Param == Arg? Sema::TDK_Success : Sema::TDK_NonDeducedMismatch; 1132fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor } 1133fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor 11344ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // _Complex T [placeholder extension] 11354ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Complex: 11364ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const ComplexType *ComplexArg = Arg->getAs<ComplexType>()) 1137bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 11384ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor cast<ComplexType>(Param)->getElementType(), 1139bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ComplexArg->getElementType(), 1140bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF); 11414ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 11424ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1143b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 1144b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman // _Atomic T [extension] 1145b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman case Type::Atomic: 1146b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman if (const AtomicType *AtomicArg = Arg->getAs<AtomicType>()) 1147bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1148b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman cast<AtomicType>(Param)->getValueType(), 1149b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman AtomicArg->getValueType(), 1150b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman Info, Deduced, TDF); 1151b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 1152b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman return Sema::TDK_NonDeducedMismatch; 1153b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 1154199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T * 1155d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::Pointer: { 1156c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall QualType PointeeType; 1157c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall if (const PointerType *PointerArg = Arg->getAs<PointerType>()) { 1158c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType = PointerArg->getPointeeType(); 1159c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } else if (const ObjCObjectPointerType *PointerArg 1160c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall = Arg->getAs<ObjCObjectPointerType>()) { 1161c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType = PointerArg->getPointeeType(); 1162c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } else { 1163f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1164c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } 11651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11664112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor unsigned SubTDF = TDF & (TDF_IgnoreQualifiers | TDF_DerivedClass); 1167bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1168bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl cast<PointerType>(Param)->getPointeeType(), 1169c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType, 11704112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor Info, Deduced, SubTDF); 1171d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1173199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T & 1174d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::LValueReference: { 11756217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const LValueReferenceType *ReferenceArg = Arg->getAs<LValueReferenceType>(); 1176d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor if (!ReferenceArg) 1177f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1179bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1180d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor cast<LValueReferenceType>(Param)->getPointeeType(), 1181bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ReferenceArg->getPointeeType(), Info, Deduced, 0); 1182d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11830b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1184199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T && [C++0x] 1185d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::RValueReference: { 11866217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const RValueReferenceType *ReferenceArg = Arg->getAs<RValueReferenceType>(); 1187d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor if (!ReferenceArg) 1188f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1190bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1191bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl cast<RValueReferenceType>(Param)->getPointeeType(), 1192bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ReferenceArg->getPointeeType(), 1193bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 0); 1194d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1196199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T [] (implied, but not stated explicitly) 11974d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson case Type::IncompleteArray: { 11981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const IncompleteArrayType *IncompleteArrayArg = 1199a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsIncompleteArrayType(Arg); 12004d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (!IncompleteArrayArg) 1201f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 12021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1203e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1204bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1205bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl S.Context.getAsIncompleteArrayType(Param)->getElementType(), 1206bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl IncompleteArrayArg->getElementType(), 1207bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, SubTDF); 12084d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson } 1209199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1210199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T [integer-constant] 12114d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson case Type::ConstantArray: { 12121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const ConstantArrayType *ConstantArrayArg = 1213a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsConstantArrayType(Arg); 12144d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (!ConstantArrayArg) 1215f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 12161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const ConstantArrayType *ConstantArrayParm = 1218a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsConstantArrayType(Param); 12194d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (ConstantArrayArg->getSize() != ConstantArrayParm->getSize()) 1220f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 12211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1222e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1223bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1224bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ConstantArrayParm->getElementType(), 1225bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ConstantArrayArg->getElementType(), 1226bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, SubTDF); 12274d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson } 12284d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson 1229199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // type [i] 1230199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case Type::DependentSizedArray: { 1231a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth const ArrayType *ArrayArg = S.Context.getAsArrayType(Arg); 1232199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (!ArrayArg) 1233f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 12341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1235e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1236e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall 1237199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Check the element type of the arrays 1238199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor const DependentSizedArrayType *DependentArrayParm 1239a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = S.Context.getAsDependentSizedArrayType(Param); 1240f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1241bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1242bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl DependentArrayParm->getElementType(), 1243bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ArrayArg->getElementType(), 1244bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, SubTDF)) 1245f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 12461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1247199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Determine the array bound is something we can deduce. 12481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NonTypeTemplateParmDecl *NTTP 1249199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = getDeducedParameterFromExpr(DependentArrayParm->getSizeExpr()); 1250199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (!NTTP) 1251f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 12521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // We can perform template argument deduction for the given non-type 1254199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // template parameter. 12551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 1256199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument at depth > 0"); 12571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const ConstantArrayType *ConstantArrayArg 1258335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson = dyn_cast<ConstantArrayType>(ArrayArg)) { 1259335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson llvm::APSInt Size(ConstantArrayArg->getSize()); 1260dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceNonTypeTemplateArgument(S, NTTP, Size, 12619d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor S.Context.getSizeType(), 126202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor /*ArrayBound=*/true, 1263f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 1264335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson } 1265199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (const DependentSizedArrayType *DependentArrayArg 1266199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = dyn_cast<DependentSizedArrayType>(ArrayArg)) 126734c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor if (DependentArrayArg->getSizeExpr()) 126834c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, 126934c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor DependentArrayArg->getSizeExpr(), 127034c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor Info, Deduced); 12711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1272199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Incomplete type does not match a dependently-sized array type 1273f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1274199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 12751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // type(*)(T) 12771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(*)() 12781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(*)(T) 1279a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson case Type::FunctionProto: { 128073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor unsigned SubTDF = TDF & TDF_TopLevelParameterTypeList; 12811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *FunctionProtoArg = 1282a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson dyn_cast<FunctionProtoType>(Arg); 1283a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson if (!FunctionProtoArg) 1284f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 12851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *FunctionProtoParam = 1287a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson cast<FunctionProtoType>(Param); 1288994b6cb65c9daba2128366bc4c64be6dbf953528Anders Carlsson 1289dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (FunctionProtoParam->getTypeQuals() 1290e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor != FunctionProtoArg->getTypeQuals() || 1291dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionProtoParam->getRefQualifier() 1292e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor != FunctionProtoArg->getRefQualifier() || 1293e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor FunctionProtoParam->isVariadic() != FunctionProtoArg->isVariadic()) 1294f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1295994b6cb65c9daba2128366bc4c64be6dbf953528Anders Carlsson 1296a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson // Check return types. 1297f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1298bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1299bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl FunctionProtoParam->getResultType(), 1300bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl FunctionProtoArg->getResultType(), 1301bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 0)) 1302f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 13031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1304603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return DeduceTemplateArguments(S, TemplateParams, 1305603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoParam->arg_type_begin(), 1306603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoParam->getNumArgs(), 1307603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoArg->arg_type_begin(), 1308603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoArg->getNumArgs(), 130973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Info, Deduced, SubTDF); 1310a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson } 13111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13123cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall case Type::InjectedClassName: { 13133cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // Treat a template's injected-class-name as if the template 13143cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // specialization type had been used. 131531f17ecbef57b5679c017c375db330546b7b5145John McCall Param = cast<InjectedClassNameType>(Param) 131631f17ecbef57b5679c017c375db330546b7b5145John McCall ->getInjectedSpecializationType(); 13173cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall assert(isa<TemplateSpecializationType>(Param) && 13183cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall "injected class name is not a template specialization type"); 13193cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // fall through 13203cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall } 13213cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall 1322f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor // template-name<T> (where template-name refers to a class template) 1323d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor // template-name<i> 1324db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<T> 1325db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<i> 1326db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<> 1327d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor case Type::TemplateSpecialization: { 1328d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor const TemplateSpecializationType *SpecParam 1329d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor = cast<TemplateSpecializationType>(Param); 13301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1331de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Try to deduce template arguments from the template-id. 1332de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Sema::TemplateDeductionResult Result 1333a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, SpecParam, Arg, 1334de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced); 13351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13364a5c15f75f76b95e1c2ceb6fa2737dcadd5f4be1Douglas Gregor if (Result && (TDF & TDF_DerivedClass)) { 1337de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // C++ [temp.deduct.call]p3b3: 1338de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If P is a class, and P has the form template-id, then A can be a 1339de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // derived class of the deduced A. Likewise, if P is a pointer to a 13401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // class of the form template-id, A can be a pointer to a derived 1341de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // class pointed to by the deduced A. 1342de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // 1343de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // More importantly: 13441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // These alternatives are considered only if type deduction would 1345de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // otherwise fail. 1346a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth if (const RecordType *RecordT = Arg->getAs<RecordType>()) { 1347a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // We cannot inspect base classes as part of deduction when the type 1348a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // is incomplete, so either instantiate any templates necessary to 1349a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // complete the type, or skip over it if it cannot be completed. 13505769d6195087229770d7ac90449443e026c47103John McCall if (S.RequireCompleteType(Info.getLocation(), Arg, 0)) 1351a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return Result; 1352a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth 1353de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Use data recursion to crawl through the list of base classes. 13541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Visited contains the set of nodes we have already visited, while 1355de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // ToVisit is our stack of records that we still need to visit. 1356de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor llvm::SmallPtrSet<const RecordType *, 8> Visited; 13575f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<const RecordType *, 8> ToVisit; 1358de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor ToVisit.push_back(RecordT); 1359de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor bool Successful = false; 136074fe66181db91d45d48f57abe325ea487e32ddbcBenjamin Kramer SmallVector<DeducedTemplateArgument, 8> DeducedOrig(Deduced.begin(), 136174fe66181db91d45d48f57abe325ea487e32ddbcBenjamin Kramer Deduced.end()); 1362de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor while (!ToVisit.empty()) { 1363de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Retrieve the next class in the inheritance hierarchy. 1364de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const RecordType *NextT = ToVisit.back(); 1365de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor ToVisit.pop_back(); 13661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1367de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If we have already seen this type, skip it. 1368de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!Visited.insert(NextT)) 1369de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor continue; 13701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1371de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If this is a base class, try to perform template argument 1372de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // deduction from it. 1373de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (NextT != RecordT) { 1374de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Sema::TemplateDeductionResult BaseResult 1375a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, SpecParam, 1376de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor QualType(NextT, 0), Info, Deduced); 13771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1378de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If template argument deduction for this base was successful, 1379053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor // note that we had some success. Otherwise, ignore any deductions 1380053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor // from this base class. 1381053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor if (BaseResult == Sema::TDK_Success) { 1382de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Successful = true; 138374fe66181db91d45d48f57abe325ea487e32ddbcBenjamin Kramer DeducedOrig.clear(); 138474fe66181db91d45d48f57abe325ea487e32ddbcBenjamin Kramer DeducedOrig.append(Deduced.begin(), Deduced.end()); 1385053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor } 1386053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor else 1387053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor Deduced = DeducedOrig; 1388de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1390de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Visit base classes 1391de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor CXXRecordDecl *Next = cast<CXXRecordDecl>(NextT->getDecl()); 1392de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor for (CXXRecordDecl::base_class_iterator Base = Next->bases_begin(), 1393de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor BaseEnd = Next->bases_end(); 13949994a34f6cf842721ba7723edc0b9036229fe387Sebastian Redl Base != BaseEnd; ++Base) { 13951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(Base->getType()->isRecordType() && 1396de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor "Base class that isn't a record?"); 13976217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek ToVisit.push_back(Base->getType()->getAs<RecordType>()); 1398de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 1399de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 14001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1401de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Successful) 1402de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_Success; 1403de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 14041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1405de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 14061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1407de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 1408d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor } 1409d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 1410637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T type::* 1411637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T T::* 1412637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (type::*)() 1413637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (T::*)() 1414637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (type::*)(T) 1415637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (T::*)(T) 1416637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (type::*)(T) 1417637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (T::*)() 1418637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (T::*)(T) 1419637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::MemberPointer: { 1420637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor const MemberPointerType *MemPtrParam = cast<MemberPointerType>(Param); 1421637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor const MemberPointerType *MemPtrArg = dyn_cast<MemberPointerType>(Arg); 1422637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor if (!MemPtrArg) 1423f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1424f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1425f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1426bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1427bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl MemPtrParam->getPointeeType(), 1428bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl MemPtrArg->getPointeeType(), 1429bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 1430bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TDF & TDF_IgnoreQualifiers)) 1431f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 1432f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1433bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1434bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl QualType(MemPtrParam->getClass(), 0), 1435bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl QualType(MemPtrArg->getClass(), 0), 1436fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor Info, Deduced, 1437fc55a8290a3e81111c0a373e1a04b09dd7da0b98Douglas Gregor TDF & TDF_IgnoreQualifiers); 1438637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor } 1439637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor 14409a917e4fac79aba20fbd25983c78396475078918Anders Carlsson // (clang extension) 14419a917e4fac79aba20fbd25983c78396475078918Anders Carlsson // 14421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // type(^)(T) 14431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(^)() 14441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(^)(T) 1445859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson case Type::BlockPointer: { 1446859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson const BlockPointerType *BlockPtrParam = cast<BlockPointerType>(Param); 1447859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson const BlockPointerType *BlockPtrArg = dyn_cast<BlockPointerType>(Arg); 14481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1449859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson if (!BlockPtrArg) 1450f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 14511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1452bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1453bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl BlockPtrParam->getPointeeType(), 1454bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl BlockPtrArg->getPointeeType(), 1455bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 0); 1456859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson } 1457859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson 14584ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // (clang extension) 14594ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // 14604ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // T __attribute__(((ext_vector_type(<integral constant>)))) 14614ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ExtVector: { 14624ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor const ExtVectorType *VectorParam = cast<ExtVectorType>(Param); 14634ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { 14644ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Make sure that the vectors have the same number of elements. 14654ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (VectorParam->getNumElements() != VectorArg->getNumElements()) 14664ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 14674ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14684ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 1469bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1470bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorParam->getElementType(), 1471bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorArg->getElementType(), 1472bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF); 14734ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14744ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14754ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const DependentSizedExtVectorType *VectorArg 14764ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = dyn_cast<DependentSizedExtVectorType>(Arg)) { 14774ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // We can't check the number of elements, since the argument has a 14784ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // dependent number of elements. This can only occur during partial 14794ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // ordering. 14804ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14814ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 1482bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1483bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorParam->getElementType(), 1484bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorArg->getElementType(), 1485bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF); 14864ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14874ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14884ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 14894ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14904ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14914ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // (clang extension) 14924ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // 14934ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // T __attribute__(((ext_vector_type(N)))) 14944ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::DependentSizedExtVector: { 14954ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor const DependentSizedExtVectorType *VectorParam 14964ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = cast<DependentSizedExtVectorType>(Param); 14974ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14984ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { 14994ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 15004ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (Sema::TemplateDeductionResult Result 1501bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1502bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorParam->getElementType(), 1503bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorArg->getElementType(), 1504bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF)) 15054ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Result; 15064ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15074ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the vector size, if we can. 15084ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor NonTypeTemplateParmDecl *NTTP 15094ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = getDeducedParameterFromExpr(VectorParam->getSizeExpr()); 15104ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (!NTTP) 15114ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_Success; 15124ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15134ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor llvm::APSInt ArgSize(S.Context.getTypeSize(S.Context.IntTy), false); 15144ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor ArgSize = VectorArg->getNumElements(); 15154ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, ArgSize, S.Context.IntTy, 15164ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor false, Info, Deduced); 15174ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 15184ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15194ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const DependentSizedExtVectorType *VectorArg 15204ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = dyn_cast<DependentSizedExtVectorType>(Arg)) { 15214ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 15224ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (Sema::TemplateDeductionResult Result 1523bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1524bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorParam->getElementType(), 1525bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorArg->getElementType(), 1526bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF)) 15274ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Result; 15284ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15294ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the vector size, if we can. 15304ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor NonTypeTemplateParmDecl *NTTP 15314ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = getDeducedParameterFromExpr(VectorParam->getSizeExpr()); 15324ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (!NTTP) 15334ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_Success; 15344ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15354ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, VectorArg->getSizeExpr(), 15364ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor Info, Deduced); 15374ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 15384ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15394ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 15404ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 15414ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 1542637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::TypeOfExpr: 1543637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::TypeOf: 15444714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor case Type::DependentName: 15454ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::UnresolvedUsing: 15464ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Decltype: 15474ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::UnaryTransform: 15484ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Auto: 15494ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::DependentTemplateSpecialization: 15504ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::PackExpansion: 1551637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // No template argument deduction for these types 1552f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 15530b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 15540b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 15553026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid Type Class!"); 15560b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 15570b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1558f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 1559a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 1560f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 1561f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor const TemplateArgument &Param, 156277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor TemplateArgument Arg, 15632a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 15645f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 156577d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the template argument is a pack expansion, perform template argument 156677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // deduction against the pattern of that expansion. This only occurs during 156777d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // partial ordering. 156877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (Arg.isPackExpansion()) 156977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Arg = Arg.getPackExpansionPattern(); 1570dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 15710b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor switch (Param.getKind()) { 1572199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Null: 1573b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Null template argument in parameter list"); 15741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case TemplateArgument::Type: 1576788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (Arg.getKind() == TemplateArgument::Type) 1577bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1578bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Param.getAsType(), 1579bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Arg.getAsType(), 1580bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 0); 1581788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.FirstArg = Param; 1582788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.SecondArg = Arg; 1583788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1584a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 1585788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 1586db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (Arg.getKind() == TemplateArgument::Template) 1587dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 1588788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Param.getAsTemplate(), 1589db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Arg.getAsTemplate(), Info, Deduced); 1590788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.FirstArg = Param; 1591788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.SecondArg = Arg; 1592788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1593a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 1594a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 1595a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor llvm_unreachable("caller should handle pack expansions"); 1596dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1597199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Declaration: 1598788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (Arg.getKind() == TemplateArgument::Declaration && 1599d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor isSameDeclaration(Param.getAsDecl(), Arg.getAsDecl())) 1600788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_Success; 1601dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1602f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1603f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1604f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 16051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1606199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Integral: 1607199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Integral) { 1608855243789cb44799c03f4c7216d3d6308805f549Benjamin Kramer if (hasSameExtendedValue(Param.getAsIntegral(), Arg.getAsIntegral())) 1609f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 1610f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1611f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1612f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1613f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1614f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 1615f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1616f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Arg.getKind() == TemplateArgument::Expression) { 1617f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1618f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1619f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1620199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 1621199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1622f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1623f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1624f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 16251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1626199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Expression: { 16271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (NonTypeTemplateParmDecl *NTTP 1628199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = getDeducedParameterFromExpr(Param.getAsExpr())) { 1629199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Integral) 1630a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, 1631855243789cb44799c03f4c7216d3d6308805f549Benjamin Kramer Arg.getAsIntegral(), 16329d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor Arg.getIntegralType(), 163302024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor /*ArrayBound=*/false, 1634f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 1635199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Expression) 1636a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsExpr(), 1637f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 163815755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor if (Arg.getKind() == TemplateArgument::Declaration) 1639a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsDecl(), 164015755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor Info, Deduced); 1641dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1642f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1643f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1644f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1645199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 16461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1647199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Can't deduce anything, but that's okay. 1648f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 1649199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 1650d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson case TemplateArgument::Pack: 165120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor llvm_unreachable("Argument packs should be expanded by the caller!"); 16520b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 16531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 16543026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid TemplateArgument Kind!"); 16550b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 16560b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 165720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \brief Determine whether there is a template argument to be used for 165820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// deduction. 165920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// 166020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// This routine "expands" argument packs in-place, overriding its input 166120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// parameters so that \c Args[ArgIdx] will be the available template argument. 166220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// 166320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \returns true if there is another template argument (which will be at 166420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \c Args[ArgIdx]), false otherwise. 1665dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic bool hasTemplateArgumentForDeduction(const TemplateArgument *&Args, 166620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned &ArgIdx, 166720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned &NumArgs) { 166820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (ArgIdx == NumArgs) 166920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return false; 1670dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 167120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument &Arg = Args[ArgIdx]; 167220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (Arg.getKind() != TemplateArgument::Pack) 167320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return true; 167420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 167520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor assert(ArgIdx == NumArgs - 1 && "Pack not at the end of argument list?"); 167620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Args = Arg.pack_begin(); 167720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor NumArgs = Arg.pack_size(); 167820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ArgIdx = 0; 167920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return ArgIdx < NumArgs; 168020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor} 168120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 16827b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor/// \brief Determine whether the given set of template arguments has a pack 16837b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor/// expansion that is not the last template argument. 16847b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregorstatic bool hasPackExpansionBeforeEnd(const TemplateArgument *Args, 16857b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor unsigned NumArgs) { 16867b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor unsigned ArgIdx = 0; 16877b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor while (ArgIdx < NumArgs) { 16887b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor const TemplateArgument &Arg = Args[ArgIdx]; 1689dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16907b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // Unwrap argument packs. 16917b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (Args[ArgIdx].getKind() == TemplateArgument::Pack) { 16927b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor Args = Arg.pack_begin(); 16937b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor NumArgs = Arg.pack_size(); 16947b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor ArgIdx = 0; 16957b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor continue; 16967b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor } 1697dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16987b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor ++ArgIdx; 16997b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (ArgIdx == NumArgs) 17007b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return false; 1701dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 17027b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (Arg.isPackExpansion()) 17037b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return true; 17047b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor } 1705dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 17067b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return false; 17077b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor} 17087b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 17091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic Sema::TemplateDeductionResult 1710a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 1711f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 171220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Params, unsigned NumParams, 171320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Args, unsigned NumArgs, 17142a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 17155f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 17160972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor bool NumberOfArgumentsMustMatch) { 1717e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1718dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 1719dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 1720e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // non-deduced context. 17217b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (hasPackExpansionBeforeEnd(Params, NumParams)) 17227b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return Sema::TDK_Success; 1723dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1724e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1725dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If P has a form that contains <T> or <i>, then each argument Pi of the 1726dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // respective template argument list P is compared with the corresponding 1727e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // argument Ai of the corresponding template argument list of A. 172820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned ArgIdx = 0, ParamIdx = 0; 1729dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (; hasTemplateArgumentForDeduction(Params, ParamIdx, NumParams); 173020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ++ParamIdx) { 173120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (!Params[ParamIdx].isPackExpansion()) { 1732e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The simple case: deduce template arguments by matching Pi and Ai. 1733dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 173420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Check whether we have enough arguments. 173520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (!hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) 17363cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return NumberOfArgumentsMustMatch? Sema::TDK_NonDeducedMismatch 17370972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor : Sema::TDK_Success; 1738dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 173977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (Args[ArgIdx].isPackExpansion()) { 174077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // FIXME: We follow the logic of C++0x [temp.deduct.type]p22 here, 174177d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // but applied to pack expansions that are template arguments. 174277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor return Sema::TDK_NonDeducedMismatch; 174377d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor } 1744dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1745e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Perform deduction for this Pi/Ai pair. 174620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (Sema::TemplateDeductionResult Result 174777d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor = DeduceTemplateArguments(S, TemplateParams, 174877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Params[ParamIdx], Args[ArgIdx], 174977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Info, Deduced)) 1750dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 1751dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 175220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Move to the next argument. 175320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ++ArgIdx; 175420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor continue; 175520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor } 1756dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1757e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The parameter is a pack expansion. 1758dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1759e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1760dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If Pi is a pack expansion, then the pattern of Pi is compared with 1761dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // each remaining argument in the template argument list of A. Each 1762dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // comparison deduces template arguments for subsequent positions in the 1763e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // template parameter packs expanded by Pi. 1764e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor TemplateArgument Pattern = Params[ParamIdx].getPackExpansionPattern(); 1765dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1766e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Compute the set of template parameter indices that correspond to 1767e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // parameter packs expanded by the pack expansion. 17685f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<unsigned, 2> PackIndices; 1769e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor { 1770013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector SawIndices(TemplateParams->size()); 17715f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UnexpandedParameterPack, 2> Unexpanded; 1772e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor S.collectUnexpandedParameterPacks(Pattern, Unexpanded); 1773e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 1774e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor unsigned Depth, Index; 1775e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 1776e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 1777e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor SawIndices[Index] = true; 1778e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor PackIndices.push_back(Index); 1779e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1780e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1781e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1782e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 1783dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1784e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // FIXME: If there are no remaining arguments, we can bail out early 1785e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // and set any deduced parameter packs to an empty argument pack. 1786e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The latter part of this is a (minor) correctness issue. 1787dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1788e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Save the deduced template arguments for each parameter pack expanded 1789e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // by this pack expansion, then clear out the deduction. 17905f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 2> 1791e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor SavedPacks(PackIndices.size()); 17925f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> 17935429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 1794dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, 17955429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks); 1796e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor 1797e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Keep track of the deduced template arguments for each parameter pack 1798dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 1799e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // template argument (the inner SmallVectors). 1800e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor bool HasAnyArguments = false; 1801e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor while (hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) { 1802e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor HasAnyArguments = true; 1803dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1804e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Deduce template arguments from the pattern. 1805dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (Sema::TemplateDeductionResult Result 1806e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, Pattern, Args[ArgIdx], 1807e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info, Deduced)) 1808e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor return Result; 1809dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1810e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 1811e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 1812e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // for that pack, then clear out the deduced argument. 1813e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 1814e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 1815e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (!DeducedArg.isNull()) { 1816e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 1817e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor DeducedArg = DeducedTemplateArgument(); 1818e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1819e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1820dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1821e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor ++ArgIdx; 1822e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1823dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1824e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 1825e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // pack expansion. 18260216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 1827dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(S, TemplateParams, HasAnyArguments, 18280216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 18290216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 1830dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 18310b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 1832dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 183320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // If there is an argument remaining, then we had too many arguments. 18340972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor if (NumberOfArgumentsMustMatch && 18350972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) 18363cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1837dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1838f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 18390b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 18400b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 184120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregorstatic Sema::TemplateDeductionResult 184220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas GregorDeduceTemplateArguments(Sema &S, 184320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateParameterList *TemplateParams, 184420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgumentList &ParamList, 184520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgumentList &ArgList, 184620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateDeductionInfo &Info, 18475f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 1848dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 184920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ParamList.data(), ParamList.size(), 185020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ArgList.data(), ArgList.size(), 185120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Info, Deduced); 185220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor} 185320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 1854f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor/// \brief Determine whether two template arguments are the same. 18551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic bool isSameTemplateArg(ASTContext &Context, 1856f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor const TemplateArgument &X, 1857f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor const TemplateArgument &Y) { 1858f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (X.getKind() != Y.getKind()) 1859f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 18601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1861f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor switch (X.getKind()) { 1862f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Null: 1863b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Comparing NULL template argument"); 18641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1865f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Type: 1866f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Context.getCanonicalType(X.getAsType()) == 1867f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Context.getCanonicalType(Y.getAsType()); 18681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1869f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Declaration: 1870d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor return isSameDeclaration(X.getAsDecl(), Y.getAsDecl()); 18711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1872788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 1873a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 1874a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor return Context.getCanonicalTemplateName( 1875a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor X.getAsTemplateOrTemplatePattern()).getAsVoidPointer() == 1876a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Context.getCanonicalTemplateName( 1877a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Y.getAsTemplateOrTemplatePattern()).getAsVoidPointer(); 1878dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1879f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Integral: 1880855243789cb44799c03f4c7216d3d6308805f549Benjamin Kramer return X.getAsIntegral() == Y.getAsIntegral(); 18811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1882788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Expression: { 1883788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor llvm::FoldingSetNodeID XID, YID; 1884788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor X.getAsExpr()->Profile(XID, Context, true); 1885dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Y.getAsExpr()->Profile(YID, Context, true); 1886788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return XID == YID; 1887788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor } 18881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1889f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Pack: 1890f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (X.pack_size() != Y.pack_size()) 1891f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 18921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 18931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (TemplateArgument::pack_iterator XP = X.pack_begin(), 18941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump XPEnd = X.pack_end(), 1895f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor YP = Y.pack_begin(); 18961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump XP != XPEnd; ++XP, ++YP) 1897f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (!isSameTemplateArg(Context, *XP, *YP)) 1898f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 1899f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 1900f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return true; 1901f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor } 1902f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 19033026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid TemplateArgument Kind!"); 1904f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor} 1905f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 190654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \brief Allocate a TemplateArgumentLoc where all locations have 190754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// been initialized to the given location. 190854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 190954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param S The semantic analysis object. 191054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 19111dfbd92c83699820bfaa352e83083124e34fc9dcJames Dennett/// \param Arg The template argument we are producing template argument 191254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// location information for. 191354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 191454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param NTTPType For a declaration template argument, the type of 191554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// the non-type template parameter that corresponds to this template 191654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// argument. 191754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 191854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param Loc The source location to use for the resulting template 191954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// argument. 1920dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic TemplateArgumentLoc 192154c53cca105ed595e12fecf04e415c3712bda936Douglas GregorgetTrivialTemplateArgumentLoc(Sema &S, 1922dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const TemplateArgument &Arg, 192354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor QualType NTTPType, 192454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor SourceLocation Loc) { 192554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor switch (Arg.getKind()) { 192654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Null: 192754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor llvm_unreachable("Can't get a NULL template argument here"); 1928dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 192954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Type: 1930dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return TemplateArgumentLoc(Arg, 193154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor S.Context.getTrivialTypeSourceInfo(Arg.getAsType(), Loc)); 1932dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 193354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Declaration: { 193454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Expr *E 1935ba68eca7582a62e3e2ff4b0eba1b2b73a6b80895Douglas Gregor = S.BuildExpressionFromDeclTemplateArgument(Arg, NTTPType, Loc) 1936d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor .takeAs<Expr>(); 193754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(TemplateArgument(E), E); 193854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1939dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 194054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Integral: { 194154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Expr *E 1942ba68eca7582a62e3e2ff4b0eba1b2b73a6b80895Douglas Gregor = S.BuildExpressionFromIntegralTemplateArgument(Arg, Loc).takeAs<Expr>(); 194354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(TemplateArgument(E), E); 194454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1945dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1946b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor case TemplateArgument::Template: 1947b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor case TemplateArgument::TemplateExpansion: { 1948b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor NestedNameSpecifierLocBuilder Builder; 1949b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor TemplateName Template = Arg.getAsTemplate(); 1950b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) 1951b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.MakeTrivial(S.Context, DTN->getQualifier(), Loc); 1952b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor else if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName()) 1953b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.MakeTrivial(S.Context, QTN->getQualifier(), Loc); 1954b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1955b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor if (Arg.getKind() == TemplateArgument::Template) 1956b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor return TemplateArgumentLoc(Arg, 1957b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.getWithLocInContext(S.Context), 1958b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Loc); 1959b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1960b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1961b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor return TemplateArgumentLoc(Arg, Builder.getWithLocInContext(S.Context), 1962b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Loc, Loc); 1963b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor } 1964a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 196554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Expression: 196654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(Arg, Arg.getAsExpr()); 1967dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 196854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Pack: 196954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(Arg, TemplateArgumentLocInfo()); 197054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1971dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 19723026348bd4c13a0f83b59839f64065e0fcbea253David Blaikie llvm_unreachable("Invalid TemplateArgument Kind!"); 197354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor} 197454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 197554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 197654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \brief Convert the given deduced template argument and add it to the set of 197754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// fully-converted template arguments. 1978dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic bool ConvertDeducedTemplateArgument(Sema &S, NamedDecl *Param, 197954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor DeducedTemplateArgument Arg, 1980dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NamedDecl *Template, 1981dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi QualType NTTPType, 19826952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor unsigned ArgumentPackIndex, 198354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateDeductionInfo &Info, 198454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor bool InFunctionTemplate, 19855f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<TemplateArgument> &Output) { 198654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor if (Arg.getKind() == TemplateArgument::Pack) { 198754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // This is a template argument pack, so check each of its arguments against 198854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // the template parameter. 19895f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 2> PackedArgsBuilder; 1990dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (TemplateArgument::pack_iterator PA = Arg.pack_begin(), 1991135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor PAEnd = Arg.pack_end(); 199254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor PA != PAEnd; ++PA) { 1993d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // When converting the deduced template argument, append it to the 1994d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // general output list. We need to do this so that the template argument 1995d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // checking logic has all of the prior template arguments available. 199654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor DeducedTemplateArgument InnerArg(*PA); 199754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InnerArg.setDeducedFromArrayBound(Arg.wasDeducedFromArrayBound()); 1998dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (ConvertDeducedTemplateArgument(S, Param, InnerArg, Template, 19996952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor NTTPType, PackedArgsBuilder.size(), 20006952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor Info, InFunctionTemplate, Output)) 200154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return true; 2002dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2003d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // Move the converted template argument into our argument pack. 2004d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor PackedArgsBuilder.push_back(Output.back()); 2005d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Output.pop_back(); 200654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 2007dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 200854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Create the resulting argument pack. 2009dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Output.push_back(TemplateArgument::CreatePackCopy(S.Context, 2010203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor PackedArgsBuilder.data(), 2011203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor PackedArgsBuilder.size())); 201254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return false; 201354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 2014dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 201554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Convert the deduced template argument into a template 201654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // argument that we can check, almost as if the user had written 201754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // the template argument explicitly. 201854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateArgumentLoc ArgLoc = getTrivialTemplateArgumentLoc(S, Arg, NTTPType, 201954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.getLocation()); 2020dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 202154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Check the template argument, converting it as necessary. 202254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return S.CheckTemplateArgument(Param, ArgLoc, 202354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template, 202454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template->getLocation(), 202554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template->getSourceRange().getEnd(), 20266952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor ArgumentPackIndex, 202754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Output, 202854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InFunctionTemplate 202954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor ? (Arg.wasDeducedFromArrayBound() 2030dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ? Sema::CTAK_DeducedFromArrayBound 203154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor : Sema::CTAK_Deduced) 203254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor : Sema::CTAK_Specified); 203354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor} 203454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 203531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// Complete template argument deduction for a class template partial 203631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// specialization. 203731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregorstatic Sema::TemplateDeductionResult 2038dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiFinishTemplateArgumentDeduction(Sema &S, 203931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor ClassTemplatePartialSpecializationDecl *Partial, 204031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor const TemplateArgumentList &TemplateArgs, 20415f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 20422a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info) { 204359a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman // Unevaluated SFINAE context. 204459a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman EnterExpressionEvaluationContext Unevaluated(S, Sema::Unevaluated); 204531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Sema::SFINAETrap Trap(S); 2046dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 204731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Sema::ContextRAII SavedContext(S, Partial); 2048f5813826802c2e76cdc13cae834ebfd4518d74a6John McCall 204902cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // C++ [temp.deduct.type]p2: 205002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // [...] or if any template argument remains neither deduced nor 205102cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // explicitly specified, template argument deduction fails. 20525f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> Builder; 2053033a3cad525e5b221ba035ffc3e0abfa1241d90eDouglas Gregor TemplateParameterList *PartialParams = Partial->getTemplateParameters(); 2054033a3cad525e5b221ba035ffc3e0abfa1241d90eDouglas Gregor for (unsigned I = 0, N = PartialParams->size(); I != N; ++I) { 205554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor NamedDecl *Param = PartialParams->getParam(I); 2056f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Deduced[I].isNull()) { 205754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.Param = makeTemplateParameter(Param); 205831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_Incomplete; 2059f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 2060dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 206154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // We have deduced this argument, so it still needs to be 206254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // checked and converted. 2063dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 206454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // First, for a non-type template parameter type that is 206554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // initialized by a declaration, we need the type of the 206654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // corresponding non-type template parameter. 206754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor QualType NTTPType; 2068dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NonTypeTemplateParmDecl *NTTP 2069d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor = dyn_cast<NonTypeTemplateParmDecl>(Param)) { 207054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor NTTPType = NTTP->getType(); 2071d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor if (NTTPType->isDependentType()) { 2072dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, 2073d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Builder.data(), Builder.size()); 2074d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTPType = S.SubstType(NTTPType, 2075d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor MultiLevelTemplateArgumentList(TemplateArgs), 2076d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTP->getLocation(), 2077d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTP->getDeclName()); 2078d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor if (NTTPType.isNull()) { 2079d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Info.Param = makeTemplateParameter(Param); 2080d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // FIXME: These template arguments are temporary. Free them! 2081dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(S.Context, 2082dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.data(), 2083d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Builder.size())); 2084d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor return Sema::TDK_SubstitutionFailure; 2085d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 2086d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 2087d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 2088d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor 208954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor if (ConvertDeducedTemplateArgument(S, Param, Deduced[I], 20906952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor Partial, NTTPType, 0, Info, false, 209154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Builder)) { 209254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.Param = makeTemplateParameter(Param); 209354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2094dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder.data(), 2095dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.size())); 209654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return Sema::TDK_SubstitutionFailure; 209754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 209802cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor } 2099dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 210002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // Form the template argument list from the deduced template arguments. 21011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *DeducedArgumentList 2102dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = TemplateArgumentList::CreateCopy(S.Context, Builder.data(), 2103910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.size()); 2104910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor 2105f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.reset(DeducedArgumentList); 210602cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor 210702cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // Substitute the deduced template arguments into the template 210802cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // arguments of the class template partial specialization, and 210902cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // verify that the instantiated template arguments are both valid 211002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // and are equivalent to the template arguments originally provided 21111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to the class template. 21122a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(S); 211302cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor ClassTemplateDecl *ClassTemplate = Partial->getSpecializedTemplate(); 2114833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall const TemplateArgumentLoc *PartialTemplateArgs 2115833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall = Partial->getTemplateArgsAsWritten(); 2116d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall 2117d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall // Note that we don't provide the langle and rangle locations. 2118d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall TemplateArgumentListInfo InstArgs; 2119d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall 2120e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (S.Subst(PartialTemplateArgs, 2121e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Partial->getNumTemplateArgsAsWritten(), 2122e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor InstArgs, MultiLevelTemplateArgumentList(*DeducedArgumentList))) { 2123e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor unsigned ArgIdx = InstArgs.size(), ParamIdx = ArgIdx; 2124e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (ParamIdx >= Partial->getTemplateParameters()->size()) 2125e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor ParamIdx = Partial->getTemplateParameters()->size() - 1; 2126e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor 2127e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Decl *Param 2128e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor = const_cast<NamedDecl *>( 2129e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Partial->getTemplateParameters()->getParam(ParamIdx)); 2130e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2131e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info.FirstArg = PartialTemplateArgs[ArgIdx].getArgument(); 2132e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor return Sema::TDK_SubstitutionFailure; 2133833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall } 2134833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall 21355f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> ConvertedInstArgs; 213631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (S.CheckTemplateArgumentList(ClassTemplate, Partial->getLocation(), 213754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InstArgs, false, ConvertedInstArgs)) 213831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2139dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 214054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateParameterList *TemplateParams 214154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor = ClassTemplate->getTemplateParameters(); 214254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor for (unsigned I = 0, E = TemplateParams->size(); I != E; ++I) { 2143910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor TemplateArgument InstArg = ConvertedInstArgs.data()[I]; 214431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (!isSameTemplateArg(S.Context, TemplateArgs[I], InstArg)) { 21452fdc5e8199e1e239620f2faae88997153703e16fDouglas Gregor Info.Param = makeTemplateParameter(TemplateParams->getParam(I)); 2146f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Info.FirstArg = TemplateArgs[I]; 2147f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Info.SecondArg = InstArg; 214831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 2149f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor } 215002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor } 215102cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor 2152bb2604122f4186b6f666481f699b27c7e7a95790Douglas Gregor if (Trap.hasErrorOccurred()) 215331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2154bb2604122f4186b6f666481f699b27c7e7a95790Douglas Gregor 215531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_Success; 215631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor} 215731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 215831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// \brief Perform template argument deduction to determine whether 215931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// the given template arguments match the given class template 216031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// partial specialization per C++ [temp.class.spec.match]. 216131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas GregorSema::TemplateDeductionResult 216231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas GregorSema::DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial, 216331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor const TemplateArgumentList &TemplateArgs, 216431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor TemplateDeductionInfo &Info) { 216531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // C++ [temp.class.spec.match]p2: 216631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // A partial specialization matches a given actual template 216731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // argument list if the template arguments of the partial 216831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // specialization can be deduced from the actual template argument 216931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // list (14.8.2). 217059a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman 217159a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman // Unevaluated SFINAE context. 217259a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman EnterExpressionEvaluationContext Unevaluated(*this, Sema::Unevaluated); 217331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor SFINAETrap Trap(*this); 217459a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman 21755f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 217631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Deduced.resize(Partial->getTemplateParameters()->size()); 217731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (TemplateDeductionResult Result 217831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor = ::DeduceTemplateArguments(*this, 217931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Partial->getTemplateParameters(), 218031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Partial->getTemplateArgs(), 218131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor TemplateArgs, Info, Deduced)) 218231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Result; 218331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 21847e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith SmallVector<TemplateArgument, 4> DeducedArgs(Deduced.begin(), Deduced.end()); 218531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor InstantiatingTemplate Inst(*this, Partial->getLocation(), Partial, 21867e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith DeducedArgs, Info); 218731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (Inst) 218831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return TDK_InstantiationDepth; 218931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 219031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (Trap.hasErrorOccurred()) 219131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2192dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2193dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return ::FinishTemplateArgumentDeduction(*this, Partial, TemplateArgs, 219431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Deduced, Info); 21950b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 2196031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 21974112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor/// \brief Determine whether the given type T is a simple-template-id type. 21984112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregorstatic bool isSimpleTemplateIdType(QualType T) { 21991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateSpecializationType *Spec 2200183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = T->getAs<TemplateSpecializationType>()) 22014112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor return Spec->getTemplateName().getAsTemplateDecl() != 0; 22021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 22034112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor return false; 22044112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor} 220583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 220683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \brief Substitute the explicitly-provided template arguments into the 220783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// given function template according to C++ [temp.arg.explicit]. 220883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 220983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionTemplate the function template into which the explicit 221083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template arguments will be substituted. 221183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 22121dfbd92c83699820bfaa352e83083124e34fc9dcJames Dennett/// \param ExplicitTemplateArgs the explicitly-specified template 221383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// arguments. 221483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 22151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param Deduced the deduced template arguments, which will be populated 221683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// with the converted and checked explicit template arguments. 221783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 22181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param ParamTypes will be populated with the instantiated function 221983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// parameters. 222083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 222183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionType if non-NULL, the result type of the function template 222283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// will also be instantiated and the pointed-to value will be updated with 222383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// the instantiated function type. 222483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 222583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Info if substitution fails for any reason, this object will be 222683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// populated with more information about the failure. 222783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 222883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \returns TDK_Success if substitution was successful, or some failure 222983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// condition. 223083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::TemplateDeductionResult 223183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::SubstituteExplicitTemplateArguments( 223283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionTemplateDecl *FunctionTemplate, 223367714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo &ExplicitTemplateArgs, 22345f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 22355f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<QualType> &ParamTypes, 223683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType *FunctionType, 223783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionInfo &Info) { 223883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 223983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 224083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 224183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 2242d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs.size() == 0) { 224383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // No arguments to substitute; just copy over the parameter types and 224483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // fill in the function type. 224583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor for (FunctionDecl::param_iterator P = Function->param_begin(), 224683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor PEnd = Function->param_end(); 224783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor P != PEnd; 224883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ++P) 224983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes.push_back((*P)->getType()); 22501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 225183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType) 225283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor *FunctionType = Function->getType(); 225383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Success; 225483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 22551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 225659a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman // Unevaluated SFINAE context. 225759a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman EnterExpressionEvaluationContext Unevaluated(*this, Sema::Unevaluated); 22581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 22591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 226083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.arg.explicit]p3: 22611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Template arguments that are present shall be specified in the 22621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // declaration order of their corresponding template-parameters. The 226383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template argument list shall not specify more template-arguments than 22641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // there are corresponding template-parameters. 22655f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> Builder; 22661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 22671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Enter a new template instantiation context where we check the 226883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly-specified template arguments against this function template, 226983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // and then substitute them into the function parameter types. 22707e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith SmallVector<TemplateArgument, 4> DeducedArgs(Deduced.begin(), Deduced.end()); 22711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), 22727e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith FunctionTemplate, DeducedArgs, 22739b623639378d53a675921ddfa7316034d571881eDouglas Gregor ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution, 22749b623639378d53a675921ddfa7316034d571881eDouglas Gregor Info); 227583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (Inst) 227683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_InstantiationDepth; 22771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 227883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (CheckTemplateArgumentList(FunctionTemplate, 227983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor SourceLocation(), 2280d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall ExplicitTemplateArgs, 228183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor true, 2282f1a8445036a2d047c7165d4170e3058cdeaba6ebDouglas Gregor Builder) || Trap.hasErrorOccurred()) { 2283910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor unsigned Index = Builder.size(); 2284fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor if (Index >= TemplateParams->size()) 2285fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor Index = TemplateParams->size() - 1; 2286fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor Info.Param = makeTemplateParameter(TemplateParams->getParam(Index)); 228783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_InvalidExplicitArguments; 2288f1a8445036a2d047c7165d4170e3058cdeaba6ebDouglas Gregor } 22891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 229083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Form the template argument list from the explicitly-specified 229183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template arguments. 22921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *ExplicitArgumentList 2293910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); 229483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.reset(ExplicitArgumentList); 2295dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2296df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // Template argument deduction and the final substitution should be 2297df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // done in the context of the templated declaration. Explicit 2298df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // argument substitution, on the other hand, needs to happen in the 2299df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // calling context. 2300df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); 2301df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall 2302dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we deduced template arguments for a template parameter pack, 2303d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // note that the template argument pack is partially substituted and record 2304d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // the explicit template arguments. They'll be used as part of deduction 2305d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // for this template parameter pack. 2306d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor for (unsigned I = 0, N = Builder.size(); I != N; ++I) { 2307d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument &Arg = Builder[I]; 2308d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (Arg.getKind() == TemplateArgument::Pack) { 2309d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor CurrentInstantiationScope->SetPartiallySubstitutedPack( 2310dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateParams->getParam(I), 2311d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Arg.pack_begin(), 2312d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Arg.pack_size()); 2313d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor break; 2314d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 2315d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 2316d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor 2317eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith const FunctionProtoType *Proto 2318eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith = Function->getType()->getAs<FunctionProtoType>(); 2319eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith assert(Proto && "Function template does not have a prototype?"); 2320eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith 232183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Instantiate the types of each of the function parameters given the 2322eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith // explicitly-specified template arguments. If the function has a trailing 2323eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith // return type, substitute it after the arguments to ensure we substitute 2324eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith // in lexical order. 2325cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor if (Proto->hasTrailingReturn()) { 2326cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor if (SubstParmTypes(Function->getLocation(), 2327cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor Function->param_begin(), Function->getNumParams(), 2328cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor MultiLevelTemplateArgumentList(*ExplicitArgumentList), 2329cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor ParamTypes)) 2330cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor return TDK_SubstitutionFailure; 2331cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor } 2332cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor 2333eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith // Instantiate the return type. 2334eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith // FIXME: exception-specifications? 2335cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor QualType ResultType; 2336cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor { 2337cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor // C++11 [expr.prim.general]p3: 2338cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor // If a declaration declares a member function or member function 2339cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor // template of a class X, the expression this is a prvalue of type 2340cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor // "pointer to cv-qualifier-seq X" between the optional cv-qualifer-seq 2341cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor // and the end of the function-definition, member-declarator, or 2342cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor // declarator. 2343cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor unsigned ThisTypeQuals = 0; 2344cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor CXXRecordDecl *ThisContext = 0; 2345cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Function)) { 2346cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor ThisContext = Method->getParent(); 2347cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor ThisTypeQuals = Method->getTypeQualifiers(); 2348cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor } 2349cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor 2350cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor CXXThisScopeRAII ThisScope(*this, ThisContext, ThisTypeQuals, 2351cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor getLangOpts().CPlusPlus0x); 2352cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor 2353cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor ResultType = SubstType(Proto->getResultType(), 2354cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor MultiLevelTemplateArgumentList(*ExplicitArgumentList), 2355cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor Function->getTypeSpecStartLoc(), 2356cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor Function->getDeclName()); 2357cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor if (ResultType.isNull() || Trap.hasErrorOccurred()) 2358cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor return TDK_SubstitutionFailure; 2359cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor } 2360cefc3afac14d29de5aba7810cc8fe6c858949e9dDouglas Gregor 2361eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith // Instantiate the types of each of the function parameters given the 2362eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith // explicitly-specified template arguments if we didn't do so earlier. 2363eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith if (!Proto->hasTrailingReturn() && 2364eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith SubstParmTypes(Function->getLocation(), 2365eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith Function->param_begin(), Function->getNumParams(), 2366eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith MultiLevelTemplateArgumentList(*ExplicitArgumentList), 2367eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith ParamTypes)) 2368eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith return TDK_SubstitutionFailure; 2369eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith 2370eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith if (FunctionType) { 23711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump *FunctionType = BuildFunctionType(ResultType, 237283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes.data(), ParamTypes.size(), 237383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Proto->isVariadic(), 2374eefb3d5b49c844347f212073a7e975b8118fe8e9Richard Smith Proto->hasTrailingReturn(), 237583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Proto->getTypeQuals(), 2376c938c1668b4fd12af154e965dd935a89e4801a70Douglas Gregor Proto->getRefQualifier(), 237783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Function->getLocation(), 2378fa869547eb1cab12d7e0c0dfa8ba594e336b9b32Eli Friedman Function->getDeclName(), 2379fa869547eb1cab12d7e0c0dfa8ba594e336b9b32Eli Friedman Proto->getExtInfo()); 238083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType->isNull() || Trap.hasErrorOccurred()) 238183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 238283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 23831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 238483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.arg.explicit]p2: 23851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Trailing template arguments that can be deduced (14.8.2) may be 23861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // omitted from the list of explicit template-arguments. If all of the 238783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template arguments can be deduced, they may all be omitted; in this 238883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // case, the empty template argument list <> itself may also be omitted. 238983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // 2390d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Take all of the explicitly-specified arguments and put them into 2391d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // the set of deduced template arguments. Explicitly-specified 2392d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // parameter packs, however, will be set to NULL since the deduction 2393d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // mechanisms handle explicitly-specified argument packs directly. 239483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Deduced.reserve(TemplateParams->size()); 2395d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor for (unsigned I = 0, N = ExplicitArgumentList->size(); I != N; ++I) { 2396d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument &Arg = ExplicitArgumentList->get(I); 2397d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (Arg.getKind() == TemplateArgument::Pack) 2398d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Deduced.push_back(DeducedTemplateArgument()); 2399d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor else 2400d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Deduced.push_back(Arg); 2401d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 24021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 240383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Success; 240483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 240583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 2406b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor/// \brief Check whether the deduced argument type for a call to a function 2407b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor/// template matches the actual argument type per C++ [temp.deduct.call]p4. 2408b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregorstatic bool 2409b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas GregorCheckOriginalCallArgDeduction(Sema &S, Sema::OriginalCallArg OriginalArg, 2410b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor QualType DeducedA) { 2411b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor ASTContext &Context = S.Context; 2412b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2413b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor QualType A = OriginalArg.OriginalArgType; 2414b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor QualType OriginalParamType = OriginalArg.OriginalParamType; 2415b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2416b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Check for type equality (top-level cv-qualifiers are ignored). 2417b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (Context.hasSameUnqualifiedType(A, DeducedA)) 2418b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2419b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2420b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Strip off references on the argument types; they aren't needed for 2421b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // the following checks. 2422b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const ReferenceType *DeducedARef = DeducedA->getAs<ReferenceType>()) 2423b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor DeducedA = DeducedARef->getPointeeType(); 2424b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const ReferenceType *ARef = A->getAs<ReferenceType>()) 2425b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor A = ARef->getPointeeType(); 2426b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2427b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // C++ [temp.deduct.call]p4: 2428b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // [...] However, there are three cases that allow a difference: 2429b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // - If the original P is a reference type, the deduced A (i.e., the 2430b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // type referred to by the reference) can be more cv-qualified than 2431b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // the transformed A. 2432b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const ReferenceType *OriginalParamRef 2433b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor = OriginalParamType->getAs<ReferenceType>()) { 2434b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // We don't want to keep the reference around any more. 2435b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor OriginalParamType = OriginalParamRef->getPointeeType(); 2436b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2437b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor Qualifiers AQuals = A.getQualifiers(); 2438b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor Qualifiers DeducedAQuals = DeducedA.getQualifiers(); 2439b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor 2440b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor // Under Objective-C++ ARC, the deduced type may have implicitly been 2441b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor // given strong lifetime. If so, update the original qualifiers to 2442b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor // include this strong lifetime. 2443b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor if (S.getLangOpts().ObjCAutoRefCount && 2444b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor DeducedAQuals.getObjCLifetime() == Qualifiers::OCL_Strong && 2445b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor AQuals.getObjCLifetime() == Qualifiers::OCL_None) { 2446b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor AQuals.setObjCLifetime(Qualifiers::OCL_Strong); 2447b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor } 2448b251302dd52249c49ba6527fcd013396deef22cfDouglas Gregor 2449b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (AQuals == DeducedAQuals) { 2450b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Qualifiers match; there's nothing to do. 2451b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } else if (!DeducedAQuals.compatiblyIncludes(AQuals)) { 2452c99f0ec89fd9782cfafd14d7b1b0a80151eab24aDouglas Gregor return true; 2453b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } else { 2454b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Qualifiers are compatible, so have the argument type adopt the 2455b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // deduced argument type's qualifiers as if we had performed the 2456b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // qualification conversion. 2457b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor A = Context.getQualifiedType(A.getUnqualifiedType(), DeducedAQuals); 2458b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2459b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2460b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2461b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // - The transformed A can be another pointer or pointer to member 2462b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // type that can be converted to the deduced A via a qualification 2463b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // conversion. 246418e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // 246518e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // Also allow conversions which merely strip [[noreturn]] from function types 246618e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // (recursively) as an extension. 246718e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // FIXME: Currently, this doesn't place nicely with qualfication conversions. 2468b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor bool ObjCLifetimeConversion = false; 246918e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth QualType ResultTy; 2470b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if ((A->isAnyPointerType() || A->isMemberPointerType()) && 247118e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth (S.IsQualificationConversion(A, DeducedA, false, 247218e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth ObjCLifetimeConversion) || 247318e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth S.IsNoReturnConversion(A, DeducedA, ResultTy))) 2474b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2475b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2476b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2477b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // - If P is a class and P has the form simple-template-id, then the 2478b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // transformed A can be a derived class of the deduced A. [...] 2479b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // [...] Likewise, if P is a pointer to a class of the form 2480b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // simple-template-id, the transformed A can be a pointer to a 2481b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // derived class pointed to by the deduced A. 2482b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const PointerType *OriginalParamPtr 2483b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor = OriginalParamType->getAs<PointerType>()) { 2484b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const PointerType *DeducedAPtr = DeducedA->getAs<PointerType>()) { 2485b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const PointerType *APtr = A->getAs<PointerType>()) { 2486b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (A->getPointeeType()->isRecordType()) { 2487b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor OriginalParamType = OriginalParamPtr->getPointeeType(); 2488b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor DeducedA = DeducedAPtr->getPointeeType(); 2489b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor A = APtr->getPointeeType(); 2490b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2491b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2492b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2493b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2494b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2495b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (Context.hasSameUnqualifiedType(A, DeducedA)) 2496b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2497b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2498b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (A->isRecordType() && isSimpleTemplateIdType(OriginalParamType) && 2499b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor S.IsDerivedFrom(A, DeducedA)) 2500b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2501b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2502b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return true; 2503b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor} 2504b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 25051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Finish template argument deduction for a function template, 250683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// checking the deduced template arguments for completeness and forming 250783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// the function template specialization. 2508dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor/// 2509dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor/// \param OriginalCallArgs If non-NULL, the original call arguments against 2510dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor/// which the deduced argument types should be compared. 25111eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::TemplateDeductionResult 251283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::FinishTemplateArgumentDeduction(FunctionTemplateDecl *FunctionTemplate, 25135f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 251402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified, 251583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *&Specialization, 2516dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor TemplateDeductionInfo &Info, 25175f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<OriginalCallArg> const *OriginalCallArgs) { 251883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 251983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 25201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 252159a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman // Unevaluated SFINAE context. 252259a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman EnterExpressionEvaluationContext Unevaluated(*this, Sema::Unevaluated); 252351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor SFINAETrap Trap(*this); 252451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 252551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Enter a new template instantiation context while we instantiate the 252651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // actual function declaration. 25277e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith SmallVector<TemplateArgument, 4> DeducedArgs(Deduced.begin(), Deduced.end()); 252851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), 25297e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith FunctionTemplate, DeducedArgs, 25309b623639378d53a675921ddfa7316034d571881eDouglas Gregor ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution, 25319b623639378d53a675921ddfa7316034d571881eDouglas Gregor Info); 253251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (Inst) 253351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor return TDK_InstantiationDepth; 253451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 253596db310ab7ca59e1890ddef25a3701bc2909d20fJohn McCall ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); 2536f5813826802c2e76cdc13cae834ebfd4518d74a6John McCall 253783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.deduct.type]p2: 253883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // [...] or if any template argument remains neither deduced nor 253983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly specified, template argument deduction fails. 25405f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> Builder; 2541b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { 2542b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NamedDecl *Param = TemplateParams->getParam(I); 2543dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 254451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (!Deduced[I].isNull()) { 25453273b0cea879c7af345d6bf98502bbf73fc4fde1Douglas Gregor if (I < NumExplicitlySpecified) { 254602024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // We have already fully type-checked and converted this 2547dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // argument, because it was explicitly-specified. Just record the 25483273b0cea879c7af345d6bf98502bbf73fc4fde1Douglas Gregor // presence of this argument. 2549910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.push_back(Deduced[I]); 255002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor continue; 255102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 255202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 255302024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // We have deduced this argument, so it still needs to be 255402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // checked and converted. 255502024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 255602024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // First, for a non-type template parameter type that is 255702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // initialized by a declaration, we need the type of the 255802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // corresponding non-type template parameter. 255902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor QualType NTTPType; 2560dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NonTypeTemplateParmDecl *NTTP 2561dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = dyn_cast<NonTypeTemplateParmDecl>(Param)) { 2562b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTPType = NTTP->getType(); 2563b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (NTTPType->isDependentType()) { 2564dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, 2565b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Builder.data(), Builder.size()); 2566b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTPType = SubstType(NTTPType, 2567b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor MultiLevelTemplateArgumentList(TemplateArgs), 2568b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTP->getLocation(), 2569b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTP->getDeclName()); 2570b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (NTTPType.isNull()) { 2571b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2572b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2573dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, 2574dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.data(), 2575b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Builder.size())); 2576b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor return TDK_SubstitutionFailure; 257702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 257802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 257902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 258002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 2581b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (ConvertDeducedTemplateArgument(*this, Param, Deduced[I], 25826952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor FunctionTemplate, NTTPType, 0, Info, 258354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor true, Builder)) { 2584b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2585910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2586dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), 2587dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.size())); 258802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor return TDK_SubstitutionFailure; 258902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 259002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 259151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor continue; 259251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor } 2593dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2594ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // C++0x [temp.arg.explicit]p3: 2595dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // A trailing template parameter pack (14.5.3) not otherwise deduced will 2596ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // be deduced to an empty sequence of template arguments. 2597ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // FIXME: Where did the word "trailing" come from? 2598ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor if (Param->isTemplateParameterPack()) { 2599d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // We may have had explicitly-specified template arguments for this 2600d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template parameter pack. If so, our empty deduction extends the 2601d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // explicitly-specified set (C++0x [temp.arg.explicit]p9). 2602d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument *ExplicitArgs; 2603d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor unsigned NumExplicitArgs; 2604d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (CurrentInstantiationScope->getPartiallySubstitutedPack(&ExplicitArgs, 2605d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor &NumExplicitArgs) 2606d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor == Param) 2607d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Builder.push_back(TemplateArgument(ExplicitArgs, NumExplicitArgs)); 2608dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi else 2609d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Builder.push_back(TemplateArgument(0, 0)); 2610dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2611ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor continue; 2612ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor } 261351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 2614dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Substitute into the default template argument, if available. 261551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor TemplateArgumentLoc DefArg 261651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor = SubstDefaultTemplateArgumentIfAvailable(FunctionTemplate, 261751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getLocation(), 261851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getSourceRange().getEnd(), 261951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Param, 262051ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Builder); 262151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 262251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // If there was no default argument, deduction is incomplete. 262351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (DefArg.getArgument().isNull()) { 262483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.Param = makeTemplateParameter( 262551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor const_cast<NamedDecl *>(TemplateParams->getParam(I))); 262683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Incomplete; 262783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 2628dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 262951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Check whether we can actually use the default argument. 263051ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (CheckTemplateArgument(Param, DefArg, 263151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate, 263251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getLocation(), 263351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getSourceRange().getEnd(), 26346952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor 0, Builder, 26358735b294a257a07ca158c28094d7324f0adf889aDouglas Gregor CTAK_Specified)) { 263651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Info.Param = makeTemplateParameter( 263751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor const_cast<NamedDecl *>(TemplateParams->getParam(I))); 2638910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2639dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), 2640910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.size())); 264151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor return TDK_SubstitutionFailure; 264251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor } 26431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 264451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // If we get here, we successfully used the default template argument. 264583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 26461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 264783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Form the template argument list from the deduced template arguments. 26481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *DeducedArgumentList 2649910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); 265083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.reset(DeducedArgumentList); 26511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 26521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Substitute the deduced template arguments into the function template 265383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // declaration to produce the function template specialization. 2654d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor DeclContext *Owner = FunctionTemplate->getDeclContext(); 2655d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor if (FunctionTemplate->getFriendObjectKind()) 2656d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor Owner = FunctionTemplate->getLexicalDeclContext(); 265783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Specialization = cast_or_null<FunctionDecl>( 2658d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor SubstDecl(FunctionTemplate->getTemplatedDecl(), Owner, 2659357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor MultiLevelTemplateArgumentList(*DeducedArgumentList))); 26605fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor if (!Specialization || Specialization->isInvalidDecl()) 266183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 26621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2663dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi assert(Specialization->getPrimaryTemplate()->getCanonicalDecl() == 2664f882574cf640d5c8355965e1c486f9d8d8ffcf47Douglas Gregor FunctionTemplate->getCanonicalDecl()); 2665dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 26661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If the template argument list is owned by the function template 266783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // specialization, release it. 2668ec20f46740a59758b12c22108002395bcf5b6f9bDouglas Gregor if (Specialization->getTemplateSpecializationArgs() == DeducedArgumentList && 2669ec20f46740a59758b12c22108002395bcf5b6f9bDouglas Gregor !Trap.hasErrorOccurred()) 267083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.take(); 26711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 26725fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor // There may have been an error that did not prevent us from constructing a 26735fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor // declaration. Mark the declaration invalid and return with a substitution 26745fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor // failure. 26755fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor if (Trap.hasErrorOccurred()) { 26765fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor Specialization->setInvalidDecl(true); 26775fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor return TDK_SubstitutionFailure; 26785fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor } 26795fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor 2680dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (OriginalCallArgs) { 2681dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // C++ [temp.deduct.call]p4: 2682dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // In general, the deduction process attempts to find template argument 2683dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // values that will make the deduced A identical to A (after the type A 2684dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // is transformed as described above). [...] 2685dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor for (unsigned I = 0, N = OriginalCallArgs->size(); I != N; ++I) { 2686dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor OriginalCallArg OriginalArg = (*OriginalCallArgs)[I]; 2687dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor unsigned ParamIdx = OriginalArg.ArgIdx; 2688dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2689dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (ParamIdx >= Specialization->getNumParams()) 2690dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor continue; 2691dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2692dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType DeducedA = Specialization->getParamDecl(ParamIdx)->getType(); 2693b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (CheckOriginalCallArgDeduction(*this, OriginalArg, DeducedA)) 2694b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return Sema::TDK_SubstitutionFailure; 2695dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor } 2696dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor } 2697dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 26989b623639378d53a675921ddfa7316034d571881eDouglas Gregor // If we suppressed any diagnostics while performing template argument 26999b623639378d53a675921ddfa7316034d571881eDouglas Gregor // deduction, and if we haven't already instantiated this declaration, 27009b623639378d53a675921ddfa7316034d571881eDouglas Gregor // keep track of these diagnostics. They'll be emitted if this specialization 27019b623639378d53a675921ddfa7316034d571881eDouglas Gregor // is actually used. 27029b623639378d53a675921ddfa7316034d571881eDouglas Gregor if (Info.diag_begin() != Info.diag_end()) { 27035f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >::iterator 27049b623639378d53a675921ddfa7316034d571881eDouglas Gregor Pos = SuppressedDiagnostics.find(Specialization->getCanonicalDecl()); 27059b623639378d53a675921ddfa7316034d571881eDouglas Gregor if (Pos == SuppressedDiagnostics.end()) 27069b623639378d53a675921ddfa7316034d571881eDouglas Gregor SuppressedDiagnostics[Specialization->getCanonicalDecl()] 27079b623639378d53a675921ddfa7316034d571881eDouglas Gregor .append(Info.diag_begin(), Info.diag_end()); 2708dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 27099b623639378d53a675921ddfa7316034d571881eDouglas Gregor 27101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return TDK_Success; 271183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 271283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 27139c72c6088d591ace8503b842d39448c2040f3033John McCall/// Gets the type of a function for template-argument-deducton 27149c72c6088d591ace8503b842d39448c2040f3033John McCall/// purposes when it's considered as part of an overload set. 2715eff92135d32039c9874dc356f3e93143af6069c1John McCallstatic QualType GetTypeOfFunction(ASTContext &Context, 27169c72c6088d591ace8503b842d39448c2040f3033John McCall const OverloadExpr::FindResult &R, 2717eff92135d32039c9874dc356f3e93143af6069c1John McCall FunctionDecl *Fn) { 2718eff92135d32039c9874dc356f3e93143af6069c1John McCall if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) 27199c72c6088d591ace8503b842d39448c2040f3033John McCall if (Method->isInstance()) { 27209c72c6088d591ace8503b842d39448c2040f3033John McCall // An instance method that's referenced in a form that doesn't 27219c72c6088d591ace8503b842d39448c2040f3033John McCall // look like a member pointer is just invalid. 27229c72c6088d591ace8503b842d39448c2040f3033John McCall if (!R.HasFormOfMemberPointer) return QualType(); 27239c72c6088d591ace8503b842d39448c2040f3033John McCall 2724eff92135d32039c9874dc356f3e93143af6069c1John McCall return Context.getMemberPointerType(Fn->getType(), 2725eff92135d32039c9874dc356f3e93143af6069c1John McCall Context.getTypeDeclType(Method->getParent()).getTypePtr()); 27269c72c6088d591ace8503b842d39448c2040f3033John McCall } 27279c72c6088d591ace8503b842d39448c2040f3033John McCall 27289c72c6088d591ace8503b842d39448c2040f3033John McCall if (!R.IsAddressOfOperand) return Fn->getType(); 2729eff92135d32039c9874dc356f3e93143af6069c1John McCall return Context.getPointerType(Fn->getType()); 2730eff92135d32039c9874dc356f3e93143af6069c1John McCall} 2731eff92135d32039c9874dc356f3e93143af6069c1John McCall 2732eff92135d32039c9874dc356f3e93143af6069c1John McCall/// Apply the deduction rules for overload sets. 2733eff92135d32039c9874dc356f3e93143af6069c1John McCall/// 2734eff92135d32039c9874dc356f3e93143af6069c1John McCall/// \return the null type if this argument should be treated as an 2735eff92135d32039c9874dc356f3e93143af6069c1John McCall/// undeduced context 2736eff92135d32039c9874dc356f3e93143af6069c1John McCallstatic QualType 2737eff92135d32039c9874dc356f3e93143af6069c1John McCallResolveOverloadForDeduction(Sema &S, TemplateParameterList *TemplateParams, 273875f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor Expr *Arg, QualType ParamType, 273975f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor bool ParamWasReference) { 2740dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 27419c72c6088d591ace8503b842d39448c2040f3033John McCall OverloadExpr::FindResult R = OverloadExpr::find(Arg); 2742eff92135d32039c9874dc356f3e93143af6069c1John McCall 27439c72c6088d591ace8503b842d39448c2040f3033John McCall OverloadExpr *Ovl = R.Expression; 2744eff92135d32039c9874dc356f3e93143af6069c1John McCall 274575f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor // C++0x [temp.deduct.call]p4 274675f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor unsigned TDF = 0; 274775f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor if (ParamWasReference) 274875f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor TDF |= TDF_ParamWithReferenceType; 274975f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor if (R.IsAddressOfOperand) 275075f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor TDF |= TDF_IgnoreQualifiers; 275175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor 2752eff92135d32039c9874dc356f3e93143af6069c1John McCall // C++0x [temp.deduct.call]p6: 2753eff92135d32039c9874dc356f3e93143af6069c1John McCall // When P is a function type, pointer to function type, or pointer 2754eff92135d32039c9874dc356f3e93143af6069c1John McCall // to member function type: 2755eff92135d32039c9874dc356f3e93143af6069c1John McCall 2756eff92135d32039c9874dc356f3e93143af6069c1John McCall if (!ParamType->isFunctionType() && 2757eff92135d32039c9874dc356f3e93143af6069c1John McCall !ParamType->isFunctionPointerType() && 2758860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor !ParamType->isMemberFunctionPointerType()) { 2759860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor if (Ovl->hasExplicitTemplateArgs()) { 2760860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor // But we can still look for an explicit specialization. 2761860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor if (FunctionDecl *ExplicitSpec 2762860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor = S.ResolveSingleFunctionTemplateSpecialization(Ovl)) 2763860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor return GetTypeOfFunction(S.Context, R, ExplicitSpec); 2764860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor } 2765eff92135d32039c9874dc356f3e93143af6069c1John McCall 2766860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor return QualType(); 2767860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor } 2768860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor 2769860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor // Gather the explicit template arguments, if any. 2770860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor TemplateArgumentListInfo ExplicitTemplateArgs; 2771860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor if (Ovl->hasExplicitTemplateArgs()) 2772860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor Ovl->getExplicitTemplateArgs().copyInto(ExplicitTemplateArgs); 2773eff92135d32039c9874dc356f3e93143af6069c1John McCall QualType Match; 27747bb12da2b0749eeebb21854c77877736969e59f2John McCall for (UnresolvedSetIterator I = Ovl->decls_begin(), 27757bb12da2b0749eeebb21854c77877736969e59f2John McCall E = Ovl->decls_end(); I != E; ++I) { 2776eff92135d32039c9874dc356f3e93143af6069c1John McCall NamedDecl *D = (*I)->getUnderlyingDecl(); 2777eff92135d32039c9874dc356f3e93143af6069c1John McCall 2778860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) { 2779860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor // - If the argument is an overload set containing one or more 2780860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor // function templates, the parameter is treated as a 2781860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor // non-deduced context. 2782860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor if (!Ovl->hasExplicitTemplateArgs()) 2783860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor return QualType(); 2784860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor 2785860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor // Otherwise, see if we can resolve a function type 2786860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor FunctionDecl *Specialization = 0; 2787860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor TemplateDeductionInfo Info(S.Context, Ovl->getNameLoc()); 2788860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor if (S.DeduceTemplateArguments(FunTmpl, &ExplicitTemplateArgs, 2789860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor Specialization, Info)) 2790860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor continue; 2791860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor 2792860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor D = Specialization; 2793860d9b780b54f56cd27e16620196d213385d31f7Douglas Gregor } 2794eff92135d32039c9874dc356f3e93143af6069c1John McCall 2795eff92135d32039c9874dc356f3e93143af6069c1John McCall FunctionDecl *Fn = cast<FunctionDecl>(D); 27969c72c6088d591ace8503b842d39448c2040f3033John McCall QualType ArgType = GetTypeOfFunction(S.Context, R, Fn); 27979c72c6088d591ace8503b842d39448c2040f3033John McCall if (ArgType.isNull()) continue; 2798eff92135d32039c9874dc356f3e93143af6069c1John McCall 279975f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor // Function-to-pointer conversion. 2800dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (!ParamWasReference && ParamType->isPointerType() && 280175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor ArgType->isFunctionType()) 280275f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor ArgType = S.Context.getPointerType(ArgType); 2803dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2804eff92135d32039c9874dc356f3e93143af6069c1John McCall // - If the argument is an overload set (not containing function 2805eff92135d32039c9874dc356f3e93143af6069c1John McCall // templates), trial argument deduction is attempted using each 2806eff92135d32039c9874dc356f3e93143af6069c1John McCall // of the members of the set. If deduction succeeds for only one 2807eff92135d32039c9874dc356f3e93143af6069c1John McCall // of the overload set members, that member is used as the 2808eff92135d32039c9874dc356f3e93143af6069c1John McCall // argument value for the deduction. If deduction succeeds for 2809eff92135d32039c9874dc356f3e93143af6069c1John McCall // more than one member of the overload set the parameter is 2810eff92135d32039c9874dc356f3e93143af6069c1John McCall // treated as a non-deduced context. 2811eff92135d32039c9874dc356f3e93143af6069c1John McCall 2812eff92135d32039c9874dc356f3e93143af6069c1John McCall // We do all of this in a fresh context per C++0x [temp.deduct.type]p2: 2813eff92135d32039c9874dc356f3e93143af6069c1John McCall // Type deduction is done independently for each P/A pair, and 2814eff92135d32039c9874dc356f3e93143af6069c1John McCall // the deduced template argument values are then combined. 2815eff92135d32039c9874dc356f3e93143af6069c1John McCall // So we do not reject deductions which were made elsewhere. 28165f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 8> 281702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor Deduced(TemplateParams->size()); 28182a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(S.Context, Ovl->getNameLoc()); 2819eff92135d32039c9874dc356f3e93143af6069c1John McCall Sema::TemplateDeductionResult Result 2820bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, ParamType, 2821bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ArgType, Info, Deduced, TDF); 2822eff92135d32039c9874dc356f3e93143af6069c1John McCall if (Result) continue; 2823eff92135d32039c9874dc356f3e93143af6069c1John McCall if (!Match.isNull()) return QualType(); 2824eff92135d32039c9874dc356f3e93143af6069c1John McCall Match = ArgType; 2825eff92135d32039c9874dc356f3e93143af6069c1John McCall } 2826eff92135d32039c9874dc356f3e93143af6069c1John McCall 2827eff92135d32039c9874dc356f3e93143af6069c1John McCall return Match; 2828eff92135d32039c9874dc356f3e93143af6069c1John McCall} 2829eff92135d32039c9874dc356f3e93143af6069c1John McCall 2830dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief Perform the adjustments to the parameter and argument types 2831f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// described in C++ [temp.deduct.call]. 2832f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// 2833f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// \returns true if the caller should not attempt to perform any template 2834f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// argument deduction based on this P/A pair. 2835f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregorstatic bool AdjustFunctionParmAndArgTypesForDeduction(Sema &S, 2836f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TemplateParameterList *TemplateParams, 2837f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType &ParamType, 2838f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType &ArgType, 2839f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg, 2840f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned &TDF) { 2841f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p3: 28420099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // If P is a cv-qualified type, the top level cv-qualifiers of P's type 2843f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // are ignored for type deduction. 2844a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor if (ParamType.hasQualifiers()) 2845a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor ParamType = ParamType.getUnqualifiedType(); 2846f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>(); 2847f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) { 284834b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType PointeeType = ParamRefType->getPointeeType(); 284934b41d939a1328f484511c6002ba2456db879a29Richard Smith 2850f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor // If the argument has incomplete array type, try to complete it's type. 2851d10099e5c8238fa0327f03921cf2e3c8975c881eDouglas Gregor if (ArgType->isIncompleteArrayType() && !S.RequireCompleteExprType(Arg, 0)) 2852f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor ArgType = Arg->getType(); 2853f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor 28542ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // [C++0x] If P is an rvalue reference to a cv-unqualified 28552ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // template parameter and the argument is an lvalue, the type 28562ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // "lvalue reference to A" is used in place of A for type 28572ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // deduction. 285834b41d939a1328f484511c6002ba2456db879a29Richard Smith if (isa<RValueReferenceType>(ParamType)) { 285934b41d939a1328f484511c6002ba2456db879a29Richard Smith if (!PointeeType.getQualifiers() && 286034b41d939a1328f484511c6002ba2456db879a29Richard Smith isa<TemplateTypeParmType>(PointeeType) && 28619625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->Classify(S.Context).isLValue() && 28629625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->getType() != S.Context.OverloadTy && 28639625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->getType() != S.Context.BoundMemberTy) 28642ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor ArgType = S.Context.getLValueReferenceType(ArgType); 28652ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor } 28662ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor 2867f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // [...] If P is a reference type, the type referred to by P is used 2868f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // for type deduction. 286934b41d939a1328f484511c6002ba2456db879a29Richard Smith ParamType = PointeeType; 2870f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2871dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2872f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Overload sets usually make this parameter an undeduced 2873f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // context, but there are sometimes special circumstances. 2874f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType == S.Context.OverloadTy) { 2875f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = ResolveOverloadForDeduction(S, TemplateParams, 2876f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Arg, ParamType, 2877f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamRefType != 0); 2878f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType.isNull()) 2879f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return true; 2880f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2881dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2882f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) { 2883f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p3: 2884f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // [...] If P is of the form T&&, where T is a template parameter, and 2885f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the argument is an lvalue, the type A& is used in place of A for 2886f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type deduction. 2887f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType->isRValueReferenceType() && 2888f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamRefType->getAs<TemplateTypeParmType>() && 2889f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Arg->isLValue()) 2890f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getLValueReferenceType(ArgType); 2891f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } else { 2892f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++ [temp.deduct.call]p2: 2893f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // If P is not a reference type: 2894f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If A is an array type, the pointer type produced by the 2895f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // array-to-pointer standard conversion (4.2) is used in place of 2896f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // A for type deduction; otherwise, 2897f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType->isArrayType()) 2898f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getArrayDecayedType(ArgType); 2899f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If A is a function type, the pointer type produced by the 2900f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // function-to-pointer standard conversion (4.3) is used in place 2901f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // of A for type deduction; otherwise, 2902f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else if (ArgType->isFunctionType()) 2903f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getPointerType(ArgType); 2904f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else { 29050099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - If A is a cv-qualified type, the top level cv-qualifiers of A's 2906f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type are ignored for type deduction. 2907a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor ArgType = ArgType.getUnqualifiedType(); 2908f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2909f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2910dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2911f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p4: 2912f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // In general, the deduction process attempts to find template argument 2913f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // values that will make the deduced A identical to A (after the type A 2914f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // is transformed as described above). [...] 2915f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF = TDF_SkipNonDependent; 2916dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2917f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If the original P is a reference type, the deduced A (i.e., the 2918f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type referred to by the reference) can be more cv-qualified than 2919f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the transformed A. 2920f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) 2921f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_ParamWithReferenceType; 2922f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - The transformed A can be another pointer or pointer to member 2923f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type that can be converted to the deduced A via a qualification 2924f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // conversion (4.4). 2925f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType->isPointerType() || ArgType->isMemberPointerType() || 2926f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType->isObjCObjectPointerType()) 2927f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_IgnoreQualifiers; 2928f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If P is a class and P has the form simple-template-id, then the 2929f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // transformed A can be a derived class of the deduced A. Likewise, 2930f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // if P is a pointer to a class of the form simple-template-id, the 2931f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // transformed A can be a pointer to a derived class pointed to by 2932f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the deduced A. 2933f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (isSimpleTemplateIdType(ParamType) || 2934f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor (isa<PointerType>(ParamType) && 2935f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor isSimpleTemplateIdType( 2936f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType->getAs<PointerType>()->getPointeeType()))) 2937f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_DerivedClass; 2938dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2939f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return false; 2940f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor} 2941f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor 2942dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregorstatic bool hasDeducibleTemplateParameters(Sema &S, 2943dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor FunctionTemplateDecl *FunctionTemplate, 2944dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType T); 2945dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 29464b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl/// \brief Perform template argument deduction by matching a parameter type 29474b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl/// against a single expression, where the expression is an element of 29484b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl/// an initializer list that was originally matched against the argument 29494b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl/// type. 29504b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redlstatic Sema::TemplateDeductionResult 29514b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian RedlDeduceTemplateArgumentByListElement(Sema &S, 29524b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl TemplateParameterList *TemplateParams, 29534b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl QualType ParamType, Expr *Arg, 29544b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl TemplateDeductionInfo &Info, 29554b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl SmallVectorImpl<DeducedTemplateArgument> &Deduced, 29564b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl unsigned TDF) { 29574b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl // Handle the case where an init list contains another init list as the 29584b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl // element. 29594b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl if (InitListExpr *ILE = dyn_cast<InitListExpr>(Arg)) { 29604b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl QualType X; 29614b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl if (!S.isStdInitializerList(ParamType.getNonReferenceType(), &X)) 29624b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl return Sema::TDK_Success; // Just ignore this expression. 29634b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl 29644b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl // Recurse down into the init list. 29654b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl for (unsigned i = 0, e = ILE->getNumInits(); i < e; ++i) { 29664b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl if (Sema::TemplateDeductionResult Result = 29674b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl DeduceTemplateArgumentByListElement(S, TemplateParams, X, 29684b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl ILE->getInit(i), 29694b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl Info, Deduced, TDF)) 29704b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl return Result; 29714b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl } 29724b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl return Sema::TDK_Success; 29734b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl } 29744b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl 29754b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl // For all other cases, just match by type. 2976d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor QualType ArgType = Arg->getType(); 2977d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(S, TemplateParams, ParamType, 2978d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor ArgType, Arg, TDF)) 2979d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor return Sema::TDK_FailedOverloadResolution; 29804b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, ParamType, 2981d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor ArgType, Info, Deduced, TDF); 29824b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl} 29834b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl 2984e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \brief Perform template argument deduction from a function call 2985e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// (C++ [temp.deduct.call]). 2986e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2987e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param FunctionTemplate the function template for which we are performing 2988e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// template argument deduction. 2989e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 299040ae6666dd7a458f2d213370922a38be13f003c4James Dennett/// \param ExplicitTemplateArgs the explicit template arguments provided 299148026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// for this call. 29926db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor/// 2993e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Args the function call arguments 2994e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2995e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param NumArgs the number of arguments in Args 2996e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 299748026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// \param Name the name of the function being called. This is only significant 299848026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// when the function template is a conversion function template, in which 299948026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// case this routine will also perform template argument deduction based on 3000dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// the function to which 300148026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// 3002e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Specialization if template argument deduction was successful, 30031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// this will be set to the function template specialization produced by 3004e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// template argument deduction. 3005e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 3006e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Info the argument will be updated to provide additional information 3007e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// about template argument deduction. 3008e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 3009e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \returns the result of template argument deduction. 3010e53060fa78ad7e98352049f72787bdb7543e2a48Douglas GregorSema::TemplateDeductionResult 3011e53060fa78ad7e98352049f72787bdb7543e2a48Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 301267714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 301313a140caba448a66ffcc5ff0d32a87d6e4f4ad3fAhmed Charles llvm::ArrayRef<Expr *> Args, 3014e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor FunctionDecl *&Specialization, 3015e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor TemplateDeductionInfo &Info) { 3016e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 30176db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor 3018e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // C++ [temp.deduct.call]p1: 3019e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // Template argument deduction is done by comparing each function template 3020e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // parameter type (call it P) with the type of the corresponding argument 3021e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // of the call (call it A) as described below. 302213a140caba448a66ffcc5ff0d32a87d6e4f4ad3fAhmed Charles unsigned CheckArgs = Args.size(); 302313a140caba448a66ffcc5ff0d32a87d6e4f4ad3fAhmed Charles if (Args.size() < Function->getMinRequiredArguments()) 3024e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor return TDK_TooFewArguments; 302513a140caba448a66ffcc5ff0d32a87d6e4f4ad3fAhmed Charles else if (Args.size() > Function->getNumParams()) { 30261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *Proto 3027183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Function->getType()->getAs<FunctionProtoType>(); 3028f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (Proto->isTemplateVariadic()) 3029f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor /* Do nothing */; 3030f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else if (Proto->isVariadic()) 3031f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor CheckArgs = Function->getNumParams(); 3032dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi else 3033e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor return TDK_TooManyArguments; 3034e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 30351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30366db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // The types of the parameters from which we will perform template argument 30376db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // deduction. 30382a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 3039e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor TemplateParameterList *TemplateParams 3040e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor = FunctionTemplate->getTemplateParameters(); 30415f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 30425f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> ParamTypes; 304302024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified = 0; 3044d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs) { 304583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionResult Result = 304683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor SubstituteExplicitTemplateArguments(FunctionTemplate, 3047d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall *ExplicitTemplateArgs, 304883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Deduced, 304983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes, 305083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 0, 305183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info); 305283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (Result) 305383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return Result; 305402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 305502024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified = Deduced.size(); 30566db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor } else { 30576db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // Just fill in the parameter types from the function declaration. 3058f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) 30596db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor ParamTypes.push_back(Function->getParamDecl(I)->getType()); 30606db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor } 30611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 30626db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // Deduce template arguments from the function parameters. 30631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced.resize(TemplateParams->size()); 3064f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned ArgIdx = 0; 30655f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<OriginalCallArg, 4> OriginalCallArgs; 3066dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (unsigned ParamIdx = 0, NumParams = ParamTypes.size(); 3067f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamIdx != NumParams; ++ParamIdx) { 3068dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType OrigParamType = ParamTypes[ParamIdx]; 3069dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType ParamType = OrigParamType; 3070dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 3071dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const PackExpansionType *ParamExpansion 3072f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor = dyn_cast<PackExpansionType>(ParamType); 3073f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (!ParamExpansion) { 3074f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Simple case: matching a function parameter to a function argument. 3075f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgIdx >= CheckArgs) 3076f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 3077dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3078f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg = Args[ArgIdx++]; 3079f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ArgType = Arg->getType(); 3080dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 3081f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned TDF = 0; 3082f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, 3083f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Arg, 3084f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) 3085f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor continue; 3086dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3087d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor // If we have nothing to deduce, we're done. 3088d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor if (!hasDeducibleTemplateParameters(*this, FunctionTemplate, ParamType)) 3089d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor continue; 3090d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor 309184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // If the argument is an initializer list ... 309284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (InitListExpr *ILE = dyn_cast<InitListExpr>(Arg)) { 309384760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // ... then the parameter is an undeduced context, unless the parameter 309484760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // type is (reference to cv) std::initializer_list<P'>, in which case 309584760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // deduction is done for each element of the initializer list, and the 309684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // result is the deduced type if it's the same for all elements. 309784760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl QualType X; 309884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // Removing references was already done. 309984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (!isStdInitializerList(ParamType, &X)) 310084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl continue; 310184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl 310284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl for (unsigned i = 0, e = ILE->getNumInits(); i < e; ++i) { 310384760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (TemplateDeductionResult Result = 31044b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl DeduceTemplateArgumentByListElement(*this, TemplateParams, X, 31054b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl ILE->getInit(i), 31064b911e6536ed77524c3cef572cb0f6c8d9079e2eSebastian Redl Info, Deduced, TDF)) 310784760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl return Result; 310884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 310984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // Don't track the argument type, since an initializer list has none. 311084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl continue; 311184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 311284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl 3113dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // Keep track of the argument type and corresponding parameter index, 3114dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // so we can check for compatibility between the deduced A and A. 3115d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor OriginalCallArgs.push_back(OriginalCallArg(OrigParamType, ArgIdx-1, 3116d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor ArgType)); 3117dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 3118f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (TemplateDeductionResult Result 3119bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, 3120bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ParamType, ArgType, 3121bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF)) 3122f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return Result; 31231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3124f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor continue; 312575f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor } 3126dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3127f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p1: 3128dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // For a function parameter pack that occurs at the end of the 3129dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter-declaration-list, the type A of each remaining argument of 3130dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the call is compared with the type P of the declarator-id of the 3131dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // function parameter pack. Each comparison deduces template arguments 3132dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // for subsequent positions in the template parameter packs expanded by 31337d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // the function parameter pack. For a function parameter pack that does 3134dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // not occur at the end of the parameter-declaration-list, the type of 31357d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // the parameter pack is a non-deduced context. 31367d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor if (ParamIdx + 1 < NumParams) 31377d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor break; 3138dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3139f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ParamPattern = ParamExpansion->getPattern(); 31405f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<unsigned, 2> PackIndices; 3141f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor { 3142013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector SawIndices(TemplateParams->size()); 31435f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UnexpandedParameterPack, 2> Unexpanded; 3144f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor collectUnexpandedParameterPacks(ParamPattern, Unexpanded); 3145f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 3146f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned Depth, Index; 3147f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 3148f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 3149f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor SawIndices[Index] = true; 3150f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor PackIndices.push_back(Index); 3151f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3152f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3153f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3154f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 3155dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3156d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Keep track of the deduced template arguments for each parameter pack 3157dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 3158d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template argument (the inner SmallVectors). 31595f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> 3160d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 31615f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 2> 3162d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor SavedPacks(PackIndices.size()); 31635429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor PrepareArgumentPackDeduction(*this, Deduced, PackIndices, SavedPacks, 3164dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks); 3165f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor bool HasAnyArguments = false; 316613a140caba448a66ffcc5ff0d32a87d6e4f4ad3fAhmed Charles for (; ArgIdx < Args.size(); ++ArgIdx) { 3167f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor HasAnyArguments = true; 3168dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3169dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType OrigParamType = ParamPattern; 3170dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor ParamType = OrigParamType; 3171f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg = Args[ArgIdx]; 3172f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ArgType = Arg->getType(); 3173dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 3174f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned TDF = 0; 3175f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, 3176f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Arg, 3177f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) { 3178f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // We can't actually perform any deduction for this argument, so stop 3179f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // deduction at this point. 3180f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ++ArgIdx; 3181f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 3182f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3183dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 318484760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // As above, initializer lists need special handling. 318584760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (InitListExpr *ILE = dyn_cast<InitListExpr>(Arg)) { 318684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl QualType X; 318784760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (!isStdInitializerList(ParamType, &X)) { 318884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl ++ArgIdx; 318984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl break; 319084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 3191dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 319284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl for (unsigned i = 0, e = ILE->getNumInits(); i < e; ++i) { 319384760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (TemplateDeductionResult Result = 319484760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, X, 319584760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl ILE->getInit(i)->getType(), 319684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl Info, Deduced, TDF)) 319784760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl return Result; 319884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 319984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } else { 320084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl 320184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // Keep track of the argument type and corresponding argument index, 320284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // so we can check for compatibility between the deduced A and A. 320384760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (hasDeducibleTemplateParameters(*this, FunctionTemplate, ParamType)) 320484760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl OriginalCallArgs.push_back(OriginalCallArg(OrigParamType, ArgIdx, 320584760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl ArgType)); 320684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl 320784760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (TemplateDeductionResult Result 320884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, 320984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl ParamType, ArgType, Info, 321084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl Deduced, TDF)) 321184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl return Result; 321284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 3213eff92135d32039c9874dc356f3e93143af6069c1John McCall 3214f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 3215f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 3216f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // for that pack, then clear out the deduced argument. 3217f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 3218f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 3219f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (!DeducedArg.isNull()) { 3220f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 3221f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor DeducedArg = DeducedTemplateArgument(); 3222f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3223e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 3224e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 3225dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3226f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 3227f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // pack expansion. 32280216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 3229dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(*this, TemplateParams, HasAnyArguments, 32300216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 32310216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 3232dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 32331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3234f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // After we've matching against a parameter pack, we're done. 3235f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 3236e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 323765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 32381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 323902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified, 3240dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor Specialization, Info, &OriginalCallArgs); 324183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 3242127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor 324383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \brief Deduce template arguments when taking the address of a function 32444b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template (C++ [temp.deduct.funcaddr]) or matching a specialization to 32454b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// a template. 324683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 324783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionTemplate the function template for which we are performing 324883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template argument deduction. 324983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 325040ae6666dd7a458f2d213370922a38be13f003c4James Dennett/// \param ExplicitTemplateArgs the explicitly-specified template 32514b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// arguments. 325283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 325383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param ArgFunctionType the function type that will be used as the 325483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// "argument" type (A) when performing template argument deduction from the 32554b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// function template's function type. This type may be NULL, if there is no 32564b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// argument type to compare against, in C++0x [temp.arg.explicit]p3. 325783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 325883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Specialization if template argument deduction was successful, 32591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// this will be set to the function template specialization produced by 326083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template argument deduction. 326183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 326283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Info the argument will be updated to provide additional information 326383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// about template argument deduction. 326483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 326583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \returns the result of template argument deduction. 326683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::TemplateDeductionResult 326783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 326867714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 326983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType ArgFunctionType, 327083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *&Specialization, 327183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionInfo &Info) { 327283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 327383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 327483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 327583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType FunctionType = Function->getType(); 32761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 327783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Substitute any explicit template arguments. 32782a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 32795f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 328002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified = 0; 32815f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> ParamTypes; 3282d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs) { 32831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (TemplateDeductionResult Result 32841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump = SubstituteExplicitTemplateArguments(FunctionTemplate, 3285d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall *ExplicitTemplateArgs, 32861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced, ParamTypes, 328783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor &FunctionType, Info)) 328883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return Result; 328902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 329002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified = Deduced.size(); 3291127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor } 329283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 329359a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman // Unevaluated SFINAE context. 329459a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman EnterExpressionEvaluationContext Unevaluated(*this, Sema::Unevaluated); 32951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 32961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3297eff92135d32039c9874dc356f3e93143af6069c1John McCall Deduced.resize(TemplateParams->size()); 3298eff92135d32039c9874dc356f3e93143af6069c1John McCall 32994b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor if (!ArgFunctionType.isNull()) { 33004b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor // Deduce template arguments from the function type. 33014b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor if (TemplateDeductionResult Result 3302bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, 33034b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor FunctionType, ArgFunctionType, Info, 330473b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Deduced, TDF_TopLevelParameterTypeList)) 33054b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor return Result; 33064b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor } 3307fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 3308dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (TemplateDeductionResult Result 3309fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 3310fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor NumExplicitlySpecified, 3311fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor Specialization, Info)) 3312fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return Result; 3313fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 3314fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor // If the requested function type does not match the actual type of the 3315fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor // specialization, template argument deduction fails. 3316fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor if (!ArgFunctionType.isNull() && 3317fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor !Context.hasSameType(ArgFunctionType, Specialization->getType())) 3318fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return TDK_NonDeducedMismatch; 3319fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 3320fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return TDK_Success; 3321e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor} 3322e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor 332365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \brief Deduce template arguments for a templated conversion 332465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// function (C++ [temp.deduct.conv]) and, if successful, produce a 332565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// conversion function template specialization. 332665ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::TemplateDeductionResult 332765ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 332865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType ToType, 332965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor CXXConversionDecl *&Specialization, 333065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateDeductionInfo &Info) { 33311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump CXXConversionDecl *Conv 333265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor = cast<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()); 333365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType FromType = Conv->getConversionType(); 333465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 333565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Canonicalize the types for deduction. 333665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType P = Context.getCanonicalType(FromType); 333765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType A = Context.getCanonicalType(ToType); 333865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 33395453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p2: 334065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // If P is a reference type, the type referred to by P is used for 334165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type deduction. 334265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (const ReferenceType *PRef = P->getAs<ReferenceType>()) 334365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = PRef->getPointeeType(); 334465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 33455453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p4: 33465453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // [...] If A is a reference type, the type referred to by A is used 334765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // for type deduction. 334865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (const ReferenceType *ARef = A->getAs<ReferenceType>()) 33495453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor A = ARef->getPointeeType().getUnqualifiedType(); 33505453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++ [temp.deduct.conv]p3: 335165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // 33521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If A is not a reference type: 335365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else { 335465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor assert(!A->isReferenceType() && "Reference types were handled above"); 335565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 335665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is an array type, the pointer type produced by the 33571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // array-to-pointer standard conversion (4.2) is used in place 335865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // of P for type deduction; otherwise, 335965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (P->isArrayType()) 336065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = Context.getArrayDecayedType(P); 336165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is a function type, the pointer type produced by the 336265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // function-to-pointer standard conversion (4.3) is used in 336365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // place of P for type deduction; otherwise, 336465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else if (P->isFunctionType()) 336565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = Context.getPointerType(P); 336665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is a cv-qualified type, the top level cv-qualifiers of 33670099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // P's type are ignored for type deduction. 336865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else 336965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = P.getUnqualifiedType(); 337065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 33715453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p4: 33720099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // If A is a cv-qualified type, the top level cv-qualifiers of A's 33735453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // type are ignored for type deduction. If A is a reference type, the type 33745453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // referred to by A is used for type deduction. 337565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor A = A.getUnqualifiedType(); 337665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor } 337765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 337859a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman // Unevaluated SFINAE context. 337959a839c5a4eecfeb495fc64224f6a949d1c5b2daEli Friedman EnterExpressionEvaluationContext Unevaluated(*this, Sema::Unevaluated); 33801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 338165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 338265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // C++ [temp.deduct.conv]p1: 338365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Template argument deduction is done by comparing the return 338465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type of the template conversion function (call it P) with the 338565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type that is required as the result of the conversion (call it 338665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // A) as described in 14.8.2.4. 338765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateParameterList *TemplateParams 338865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor = FunctionTemplate->getTemplateParameters(); 33895f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 33901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced.resize(TemplateParams->size()); 339165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 339265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // C++0x [temp.deduct.conv]p4: 339365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // In general, the deduction process attempts to find template 339465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // argument values that will make the deduced A identical to 339565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // A. However, there are two cases that allow a difference: 339665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor unsigned TDF = 0; 339765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If the original A is a reference type, A can be more 339865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // cv-qualified than the deduced A (i.e., the type referred to 339965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // by the reference) 340065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (ToType->isReferenceType()) 340165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TDF |= TDF_ParamWithReferenceType; 340265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - The deduced A can be another pointer or pointer to member 34030099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // type that can be converted to A via a qualification 340465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // conversion. 340565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // 340665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // (C++0x [temp.deduct.conv]p6 clarifies that this only happens when 340765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // both P and A are pointers or member pointers. In this case, we 340865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // just ignore cv-qualifiers completely). 340965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if ((P->isPointerType() && A->isPointerType()) || 34102cae1e216c12c7574f5ac59cb0844d22bed9401dDouglas Gregor (P->isMemberPointerType() && A->isMemberPointerType())) 341165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TDF |= TDF_IgnoreQualifiers; 341265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (TemplateDeductionResult Result 3413bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, 3414bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl P, A, Info, Deduced, TDF)) 341565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return Result; 341665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 341765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Finish template argument deduction. 34182a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 341965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor FunctionDecl *Spec = 0; 342065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateDeductionResult Result 3421dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 0, Spec, 342202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor Info); 342365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor Specialization = cast_or_null<CXXConversionDecl>(Spec); 342465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return Result; 342565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor} 342665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 34274b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \brief Deduce template arguments for a function template when there is 34284b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// nothing to deduce against (C++0x [temp.arg.explicit]p3). 34294b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 34304b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param FunctionTemplate the function template for which we are performing 34314b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template argument deduction. 34324b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 343340ae6666dd7a458f2d213370922a38be13f003c4James Dennett/// \param ExplicitTemplateArgs the explicitly-specified template 34344b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// arguments. 34354b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 34364b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param Specialization if template argument deduction was successful, 34374b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// this will be set to the function template specialization produced by 34384b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template argument deduction. 34394b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 34404b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param Info the argument will be updated to provide additional information 34414b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// about template argument deduction. 34424b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 34434b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \returns the result of template argument deduction. 34444b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas GregorSema::TemplateDeductionResult 34454b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 344667714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 34474b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor FunctionDecl *&Specialization, 34484b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor TemplateDeductionInfo &Info) { 34494b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor return DeduceTemplateArguments(FunctionTemplate, ExplicitTemplateArgs, 34504b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor QualType(), Specialization, Info); 34514b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor} 34524b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor 345334b41d939a1328f484511c6002ba2456db879a29Richard Smithnamespace { 345434b41d939a1328f484511c6002ba2456db879a29Richard Smith /// Substitute the 'auto' type specifier within a type for a given replacement 345534b41d939a1328f484511c6002ba2456db879a29Richard Smith /// type. 345634b41d939a1328f484511c6002ba2456db879a29Richard Smith class SubstituteAutoTransform : 345734b41d939a1328f484511c6002ba2456db879a29Richard Smith public TreeTransform<SubstituteAutoTransform> { 345834b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Replacement; 345934b41d939a1328f484511c6002ba2456db879a29Richard Smith public: 346034b41d939a1328f484511c6002ba2456db879a29Richard Smith SubstituteAutoTransform(Sema &SemaRef, QualType Replacement) : 346134b41d939a1328f484511c6002ba2456db879a29Richard Smith TreeTransform<SubstituteAutoTransform>(SemaRef), Replacement(Replacement) { 346234b41d939a1328f484511c6002ba2456db879a29Richard Smith } 346334b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType TransformAutoType(TypeLocBuilder &TLB, AutoTypeLoc TL) { 346434b41d939a1328f484511c6002ba2456db879a29Richard Smith // If we're building the type pattern to deduce against, don't wrap the 346534b41d939a1328f484511c6002ba2456db879a29Richard Smith // substituted type in an AutoType. Certain template deduction rules 346634b41d939a1328f484511c6002ba2456db879a29Richard Smith // apply only when a template type parameter appears directly (and not if 346734b41d939a1328f484511c6002ba2456db879a29Richard Smith // the parameter is found through desugaring). For instance: 346834b41d939a1328f484511c6002ba2456db879a29Richard Smith // auto &&lref = lvalue; 346934b41d939a1328f484511c6002ba2456db879a29Richard Smith // must transform into "rvalue reference to T" not "rvalue reference to 347034b41d939a1328f484511c6002ba2456db879a29Richard Smith // auto type deduced as T" in order for [temp.deduct.call]p3 to apply. 347134b41d939a1328f484511c6002ba2456db879a29Richard Smith if (isa<TemplateTypeParmType>(Replacement)) { 347234b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Result = Replacement; 347334b41d939a1328f484511c6002ba2456db879a29Richard Smith TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result); 347434b41d939a1328f484511c6002ba2456db879a29Richard Smith NewTL.setNameLoc(TL.getNameLoc()); 347534b41d939a1328f484511c6002ba2456db879a29Richard Smith return Result; 347634b41d939a1328f484511c6002ba2456db879a29Richard Smith } else { 347734b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Result = RebuildAutoType(Replacement); 347834b41d939a1328f484511c6002ba2456db879a29Richard Smith AutoTypeLoc NewTL = TLB.push<AutoTypeLoc>(Result); 347934b41d939a1328f484511c6002ba2456db879a29Richard Smith NewTL.setNameLoc(TL.getNameLoc()); 348034b41d939a1328f484511c6002ba2456db879a29Richard Smith return Result; 348134b41d939a1328f484511c6002ba2456db879a29Richard Smith } 348234b41d939a1328f484511c6002ba2456db879a29Richard Smith } 3483dfca6f53ab97d28d43e3fa2564209df08f3d282cDouglas Gregor 3484dfca6f53ab97d28d43e3fa2564209df08f3d282cDouglas Gregor ExprResult TransformLambdaExpr(LambdaExpr *E) { 3485dfca6f53ab97d28d43e3fa2564209df08f3d282cDouglas Gregor // Lambdas never need to be transformed. 3486dfca6f53ab97d28d43e3fa2564209df08f3d282cDouglas Gregor return E; 3487dfca6f53ab97d28d43e3fa2564209df08f3d282cDouglas Gregor } 348834b41d939a1328f484511c6002ba2456db879a29Richard Smith }; 34898ad6c8696a23f410398fc126929b107404c59a95Richard Smith 34908ad6c8696a23f410398fc126929b107404c59a95Richard Smith /// Determine whether the specified type (which contains an 'auto' type 34918ad6c8696a23f410398fc126929b107404c59a95Richard Smith /// specifier) is dependent. This is not trivial, because the 'auto' specifier 34928ad6c8696a23f410398fc126929b107404c59a95Richard Smith /// itself claims to be type-dependent. 34938ad6c8696a23f410398fc126929b107404c59a95Richard Smith bool isDependentAutoType(QualType Ty) { 34948ad6c8696a23f410398fc126929b107404c59a95Richard Smith while (1) { 34958ad6c8696a23f410398fc126929b107404c59a95Richard Smith QualType Pointee = Ty->getPointeeType(); 34968ad6c8696a23f410398fc126929b107404c59a95Richard Smith if (!Pointee.isNull()) { 34978ad6c8696a23f410398fc126929b107404c59a95Richard Smith Ty = Pointee; 34988ad6c8696a23f410398fc126929b107404c59a95Richard Smith } else if (const MemberPointerType *MPT = Ty->getAs<MemberPointerType>()){ 34998ad6c8696a23f410398fc126929b107404c59a95Richard Smith if (MPT->getClass()->isDependentType()) 35008ad6c8696a23f410398fc126929b107404c59a95Richard Smith return true; 35018ad6c8696a23f410398fc126929b107404c59a95Richard Smith Ty = MPT->getPointeeType(); 35028ad6c8696a23f410398fc126929b107404c59a95Richard Smith } else if (const FunctionProtoType *FPT = Ty->getAs<FunctionProtoType>()){ 35038ad6c8696a23f410398fc126929b107404c59a95Richard Smith for (FunctionProtoType::arg_type_iterator I = FPT->arg_type_begin(), 35048ad6c8696a23f410398fc126929b107404c59a95Richard Smith E = FPT->arg_type_end(); 35058ad6c8696a23f410398fc126929b107404c59a95Richard Smith I != E; ++I) 35068ad6c8696a23f410398fc126929b107404c59a95Richard Smith if ((*I)->isDependentType()) 35078ad6c8696a23f410398fc126929b107404c59a95Richard Smith return true; 35088ad6c8696a23f410398fc126929b107404c59a95Richard Smith Ty = FPT->getResultType(); 35098ad6c8696a23f410398fc126929b107404c59a95Richard Smith } else if (Ty->isDependentSizedArrayType()) { 35108ad6c8696a23f410398fc126929b107404c59a95Richard Smith return true; 35118ad6c8696a23f410398fc126929b107404c59a95Richard Smith } else if (const ArrayType *AT = Ty->getAsArrayTypeUnsafe()) { 35128ad6c8696a23f410398fc126929b107404c59a95Richard Smith Ty = AT->getElementType(); 35138ad6c8696a23f410398fc126929b107404c59a95Richard Smith } else if (Ty->getAs<DependentSizedExtVectorType>()) { 35148ad6c8696a23f410398fc126929b107404c59a95Richard Smith return true; 35158ad6c8696a23f410398fc126929b107404c59a95Richard Smith } else if (const VectorType *VT = Ty->getAs<VectorType>()) { 35168ad6c8696a23f410398fc126929b107404c59a95Richard Smith Ty = VT->getElementType(); 35178ad6c8696a23f410398fc126929b107404c59a95Richard Smith } else { 35188ad6c8696a23f410398fc126929b107404c59a95Richard Smith break; 35198ad6c8696a23f410398fc126929b107404c59a95Richard Smith } 35208ad6c8696a23f410398fc126929b107404c59a95Richard Smith } 35218ad6c8696a23f410398fc126929b107404c59a95Richard Smith assert(Ty->getAs<AutoType>() && "didn't find 'auto' in auto type"); 35228ad6c8696a23f410398fc126929b107404c59a95Richard Smith return false; 35238ad6c8696a23f410398fc126929b107404c59a95Richard Smith } 352434b41d939a1328f484511c6002ba2456db879a29Richard Smith} 352534b41d939a1328f484511c6002ba2456db879a29Richard Smith 352634b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \brief Deduce the type for an auto type-specifier (C++0x [dcl.spec.auto]p6) 352734b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 352834b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Type the type pattern using the auto type-specifier. 352934b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 353034b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Init the initializer for the variable whose type is to be deduced. 353134b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 353234b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Result if type deduction was successful, this will be set to the 353334b41d939a1328f484511c6002ba2456db879a29Richard Smith/// deduced type. This may still contain undeduced autos if the type is 3534a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// dependent. This will be set to null if deduction succeeded, but auto 3535a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// substitution failed; the appropriate diagnostic will already have been 3536a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// produced in that case. 3537b832f6dea893f25b40500a04781286236281cb20Sebastian RedlSema::DeduceAutoResult 353832509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCallSema::DeduceAutoType(TypeSourceInfo *Type, Expr *&Init, 3539a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith TypeSourceInfo *&Result) { 354032509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall if (Init->getType()->isNonOverloadPlaceholderType()) { 354132509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall ExprResult result = CheckPlaceholderExpr(Init); 3542b832f6dea893f25b40500a04781286236281cb20Sebastian Redl if (result.isInvalid()) return DAR_FailedAlreadyDiagnosed; 354332509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall Init = result.take(); 354432509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall } 354532509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall 35468ad6c8696a23f410398fc126929b107404c59a95Richard Smith if (Init->isTypeDependent() || isDependentAutoType(Type->getType())) { 354734b41d939a1328f484511c6002ba2456db879a29Richard Smith Result = Type; 3548b832f6dea893f25b40500a04781286236281cb20Sebastian Redl return DAR_Succeeded; 354934b41d939a1328f484511c6002ba2456db879a29Richard Smith } 355034b41d939a1328f484511c6002ba2456db879a29Richard Smith 355134b41d939a1328f484511c6002ba2456db879a29Richard Smith SourceLocation Loc = Init->getExprLoc(); 355234b41d939a1328f484511c6002ba2456db879a29Richard Smith 355334b41d939a1328f484511c6002ba2456db879a29Richard Smith LocalInstantiationScope InstScope(*this); 355434b41d939a1328f484511c6002ba2456db879a29Richard Smith 355534b41d939a1328f484511c6002ba2456db879a29Richard Smith // Build template<class TemplParam> void Func(FuncParam); 35564fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth TemplateTypeParmDecl *TemplParam = 35574fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth TemplateTypeParmDecl::Create(Context, 0, SourceLocation(), Loc, 0, 0, 0, 35584fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth false, false); 35594fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth QualType TemplArg = QualType(TemplParam->getTypeForDecl(), 0); 35604fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth NamedDecl *TemplParamPtr = TemplParam; 3561483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith FixedSizeTemplateParameterList<1> TemplateParams(Loc, Loc, &TemplParamPtr, 3562483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith Loc); 3563483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith 3564a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith TypeSourceInfo *FuncParamInfo = 356534b41d939a1328f484511c6002ba2456db879a29Richard Smith SubstituteAutoTransform(*this, TemplArg).TransformType(Type); 3566a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith assert(FuncParamInfo && "substituting template parameter for 'auto' failed"); 3567a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith QualType FuncParam = FuncParamInfo->getType(); 356834b41d939a1328f484511c6002ba2456db879a29Richard Smith 356934b41d939a1328f484511c6002ba2456db879a29Richard Smith // Deduce type of TemplParam in Func(Init) 35705f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 1> Deduced; 357134b41d939a1328f484511c6002ba2456db879a29Richard Smith Deduced.resize(1); 357234b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType InitType = Init->getType(); 357334b41d939a1328f484511c6002ba2456db879a29Richard Smith unsigned TDF = 0; 357434b41d939a1328f484511c6002ba2456db879a29Richard Smith 357534b41d939a1328f484511c6002ba2456db879a29Richard Smith TemplateDeductionInfo Info(Context, Loc); 357662b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 35778ad6c8696a23f410398fc126929b107404c59a95Richard Smith InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 357862b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (InitList) { 357962b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl for (unsigned i = 0, e = InitList->getNumInits(); i < e; ++i) { 35808ad6c8696a23f410398fc126929b107404c59a95Richard Smith if (DeduceTemplateArgumentByListElement(*this, &TemplateParams, 3581d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor TemplArg, 3582d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor InitList->getInit(i), 3583d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor Info, Deduced, TDF)) 3584b832f6dea893f25b40500a04781286236281cb20Sebastian Redl return DAR_Failed; 358562b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl } 358662b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl } else { 3587d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(*this, &TemplateParams, 3588d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor FuncParam, InitType, Init, 3589d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor TDF)) 3590d280389b42bb55cd8969eae181dc3ff9f05e9aafDouglas Gregor return DAR_Failed; 35918ad6c8696a23f410398fc126929b107404c59a95Richard Smith 359262b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (DeduceTemplateArgumentsByTypeMatch(*this, &TemplateParams, FuncParam, 359362b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl InitType, Info, Deduced, TDF)) 3594b832f6dea893f25b40500a04781286236281cb20Sebastian Redl return DAR_Failed; 359562b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl } 359634b41d939a1328f484511c6002ba2456db879a29Richard Smith 359734b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType DeducedType = Deduced[0].getAsType(); 359834b41d939a1328f484511c6002ba2456db879a29Richard Smith if (DeducedType.isNull()) 3599b832f6dea893f25b40500a04781286236281cb20Sebastian Redl return DAR_Failed; 360062b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 360162b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (InitList) { 360262b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl DeducedType = BuildStdInitializerList(DeducedType, Loc); 360362b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (DeducedType.isNull()) 3604b832f6dea893f25b40500a04781286236281cb20Sebastian Redl return DAR_FailedAlreadyDiagnosed; 360562b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl } 360662b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 360734b41d939a1328f484511c6002ba2456db879a29Richard Smith Result = SubstituteAutoTransform(*this, DeducedType).TransformType(Type); 360862b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 36099a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor // Check that the deduced argument type is compatible with the original 36109a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor // argument type per C++ [temp.deduct.call]p4. 361162b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (!InitList && Result && 36129a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor CheckOriginalCallArgDeduction(*this, 36139a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor Sema::OriginalCallArg(FuncParam,0,InitType), 36149a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor Result->getType())) { 36159a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor Result = 0; 3616b832f6dea893f25b40500a04781286236281cb20Sebastian Redl return DAR_Failed; 36179a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor } 36189a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor 3619b832f6dea893f25b40500a04781286236281cb20Sebastian Redl return DAR_Succeeded; 362034b41d939a1328f484511c6002ba2456db879a29Richard Smith} 362134b41d939a1328f484511c6002ba2456db879a29Richard Smith 362262b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redlvoid Sema::DiagnoseAutoDeductionFailure(VarDecl *VDecl, Expr *Init) { 362362b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (isa<InitListExpr>(Init)) 362462b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl Diag(VDecl->getLocation(), 362562b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl diag::err_auto_var_deduction_failure_from_init_list) 362662b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl << VDecl->getDeclName() << VDecl->getType() << Init->getSourceRange(); 362762b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl else 362862b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 362962b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl << VDecl->getDeclName() << VDecl->getType() << Init->getType() 363062b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl << Init->getSourceRange(); 363162b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl} 363262b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 36338a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregorstatic void 36346fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, QualType T, 3635e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3636ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Level, 3637013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector &Deduced); 3638dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3639dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief If this is a non-static member function, 364077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregorstatic void MaybeAddImplicitObjectParameterType(ASTContext &Context, 364177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor CXXMethodDecl *Method, 36425f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<QualType> &ArgTypes) { 364377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor if (Method->isStatic()) 364477bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor return; 364577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 364677bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // C++ [over.match.funcs]p4: 364777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // 364877bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // For non-static member functions, the type of the implicit 364977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // object parameter is 36500099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - "lvalue reference to cv X" for functions declared without a 365177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // ref-qualifier or with the & ref-qualifier 365277bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // - "rvalue reference to cv X" for functions declared with the 365377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // && ref-qualifier 365477bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // 365577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // FIXME: We don't have ref-qualifiers yet, so we don't do that part. 365677bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor QualType ArgTy = Context.getTypeDeclType(Method->getParent()); 365777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTy = Context.getQualifiedType(ArgTy, 365877bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor Qualifiers::fromCVRMask(Method->getTypeQualifiers())); 365977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTy = Context.getLValueReferenceType(ArgTy); 366077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTypes.push_back(ArgTy); 366177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor} 366277bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 36638a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// \brief Determine whether the function template \p FT1 is at least as 36648a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// specialized as \p FT2. 36658a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregorstatic bool isAtLeastAsSpecializedAs(Sema &S, 36665769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc, 36678a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionTemplateDecl *FT1, 36688a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionTemplateDecl *FT2, 36698a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor TemplatePartialOrderingContext TPOC, 3670dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned NumCallArguments, 36715f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<RefParamPartialOrderingComparison> *RefParamComparisons) { 36728a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionDecl *FD1 = FT1->getTemplatedDecl(); 3673dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionDecl *FD2 = FT2->getTemplatedDecl(); 36748a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor const FunctionProtoType *Proto1 = FD1->getType()->getAs<FunctionProtoType>(); 36758a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor const FunctionProtoType *Proto2 = FD2->getType()->getAs<FunctionProtoType>(); 3676dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36778a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor assert(Proto1 && Proto2 && "Function templates must have prototypes"); 36788a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor TemplateParameterList *TemplateParams = FT2->getTemplateParameters(); 36795f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 36808a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Deduced.resize(TemplateParams->size()); 36818a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 36828a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p3: 36838a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // The types used to determine the ordering depend on the context in which 36848a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // the partial ordering is done: 36852a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(S.Context, Loc); 36868d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor CXXMethodDecl *Method1 = 0; 36878d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor CXXMethodDecl *Method2 = 0; 36888d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor bool IsNonStatic2 = false; 36898d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor bool IsNonStatic1 = false; 36908d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor unsigned Skip2 = 0; 36918a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor switch (TPOC) { 36928a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Call: { 36938a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // - In the context of a function call, the function parameter types are 36948a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // used. 36958d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Method1 = dyn_cast<CXXMethodDecl>(FD1); 36968d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Method2 = dyn_cast<CXXMethodDecl>(FD2); 36978d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic1 = Method1 && !Method1->isStatic(); 36988d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic2 = Method2 && !Method2->isStatic(); 36998d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor 37008d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // C++0x [temp.func.order]p3: 37018d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // [...] If only one of the function templates is a non-static 37028d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // member, that function template is considered to have a new 37038d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // first parameter inserted in its function parameter list. The 37048d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // new parameter is of type "reference to cv A," where cv are 37058d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // the cv-qualifiers of the function template (if any) and A is 37068d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // the class of which the function template is a member. 37078d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // 37088d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // C++98/03 doesn't have this provision, so instead we drop the 37098d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // first argument of the free function or static member, which 37108d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // seems to match existing practice. 37115f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> Args1; 37124e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie unsigned Skip1 = !S.getLangOpts().CPlusPlus0x && 37138d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic2 && !IsNonStatic1; 37144e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (S.getLangOpts().CPlusPlus0x && IsNonStatic1 && !IsNonStatic2) 3715dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MaybeAddImplicitObjectParameterType(S.Context, Method1, Args1); 3716dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Args1.insert(Args1.end(), 37178d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Proto1->arg_type_begin() + Skip1, Proto1->arg_type_end()); 371877bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 37195f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> Args2; 37204e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie Skip2 = !S.getLangOpts().CPlusPlus0x && 37218d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic1 && !IsNonStatic2; 37224e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (S.getLangOpts().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) 372377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor MaybeAddImplicitObjectParameterType(S.Context, Method2, Args2); 3724dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Args2.insert(Args2.end(), 37258d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Proto2->arg_type_begin() + Skip2, Proto2->arg_type_end()); 3726dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37275c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++ [temp.func.order]p5: 37285c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // The presence of unused ellipsis and default arguments has no effect on 37295c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // the partial ordering of function templates. 37305c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (Args1.size() > NumCallArguments) 37315c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args1.resize(NumCallArguments); 37325c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (Args2.size() > NumCallArguments) 37335c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args2.resize(NumCallArguments); 37345c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (DeduceTemplateArguments(S, TemplateParams, Args2.data(), Args2.size(), 37355c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args1.data(), Args1.size(), Info, Deduced, 37365c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TDF_None, /*PartialOrdering=*/true, 3737b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons)) 37388a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 3739dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37408a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 37418a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3742dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37438a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Conversion: 37448a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // - In the context of a call to a conversion operator, the return types 37458a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // of the conversion function templates are used. 3746bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl if (DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 3747bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Proto2->getResultType(), 3748bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Proto1->getResultType(), 3749bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF_None, 3750bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl /*PartialOrdering=*/true, 3751bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons)) 37528a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 37538a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 3754dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37558a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Other: 37560099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - In other contexts (14.6.6.2) the function template's function type 37578a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // is used. 3758bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl if (DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 3759bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl FD2->getType(), FD1->getType(), 3760bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF_None, 3761bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl /*PartialOrdering=*/true, 3762bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons)) 37638a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 37648a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 37658a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3766dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37678a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p11: 3768dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // In most cases, all template parameters must have values in order for 3769dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // deduction to succeed, but for partial ordering purposes a template 3770dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter may remain without a value provided it is not used in the 37718a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // types being used for partial ordering. [ Note: a template parameter used 37728a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // in a non-deduced context is considered used. -end note] 37738a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor unsigned ArgIdx = 0, NumArgs = Deduced.size(); 37748a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor for (; ArgIdx != NumArgs; ++ArgIdx) 37758a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Deduced[ArgIdx].isNull()) 37768a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 37778a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 37788a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (ArgIdx == NumArgs) { 3779dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // All template arguments were deduced. FT1 is at least as specialized 37808a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // as FT2. 37818a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return true; 37828a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 37838a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 3784e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // Figure out which template parameters were used. 3785013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector UsedParameters(TemplateParams->size()); 37868a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor switch (TPOC) { 37878a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Call: { 3788dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned NumParams = std::min(NumCallArguments, 3789dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi std::min(Proto1->getNumArgs(), 37905c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Proto2->getNumArgs())); 37914e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (S.getLangOpts().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) 37926fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, Method2->getThisType(S.Context), 37936fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis false, 37948d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor TemplateParams->getDepth(), UsedParameters); 37958d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor for (unsigned I = Skip2; I < NumParams; ++I) 37966fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, Proto2->getArgType(I), false, 3797ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3798e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor UsedParameters); 37998a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 38008a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3801dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38028a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Conversion: 38036fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, Proto2->getResultType(), false, 3804ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3805e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor UsedParameters); 38068a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 3807dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38088a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Other: 38096fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, FD2->getType(), false, 3810ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3811ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor UsedParameters); 38128a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 38138a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3814dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38158a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor for (; ArgIdx != NumArgs; ++ArgIdx) 38168a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // If this argument had no value deduced but was used in one of the types 38178a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // used for partial ordering, then deduction fails. 38188a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Deduced[ArgIdx].isNull() && UsedParameters[ArgIdx]) 38198a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 3820dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38218a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return true; 38228a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor} 3823dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38249da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor/// \brief Determine whether this a function template whose parameter-type-list 38259da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor/// ends with a function parameter pack. 38269da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregorstatic bool isVariadicFunctionTemplate(FunctionTemplateDecl *FunTmpl) { 38279da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor FunctionDecl *Function = FunTmpl->getTemplatedDecl(); 38289da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor unsigned NumParams = Function->getNumParams(); 38299da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (NumParams == 0) 38309da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 3831dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38329da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor ParmVarDecl *Last = Function->getParamDecl(NumParams - 1); 38339da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (!Last->isParameterPack()) 38349da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 3835dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38369da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // Make sure that no previous parameter is a parameter pack. 38379da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor while (--NumParams > 0) { 38389da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (Function->getParamDecl(NumParams - 1)->isParameterPack()) 38399da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 38409da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor } 3841dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38429da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return true; 38439da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor} 3844dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3845bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \brief Returns the more specialized function template according 384665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// to the rules of function template partial ordering (C++ [temp.func.order]). 384765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 384865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \param FT1 the first function template 384965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 385065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \param FT2 the second function template 385165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 38528a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// \param TPOC the context in which we are performing partial ordering of 38538a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// function templates. 38541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// 38555c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param NumCallArguments The number of arguments in a call, used only 38565c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// when \c TPOC is \c TPOC_Call. 38575c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 3858bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \returns the more specialized function template. If neither 385965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// template is more specialized, returns NULL. 386065ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorFunctionTemplateDecl * 386165ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::getMoreSpecializedTemplate(FunctionTemplateDecl *FT1, 386265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor FunctionTemplateDecl *FT2, 38635769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc, 38645c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TemplatePartialOrderingContext TPOC, 38655c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned NumCallArguments) { 38665f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<RefParamPartialOrderingComparison, 4> RefParamComparisons; 3867dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi bool Better1 = isAtLeastAsSpecializedAs(*this, Loc, FT1, FT2, TPOC, 38685c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor NumCallArguments, 0); 3869dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi bool Better2 = isAtLeastAsSpecializedAs(*this, Loc, FT2, FT1, TPOC, 38705c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor NumCallArguments, 3871b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor &RefParamComparisons); 3872dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38738a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Better1 != Better2) // We have a clear winner 38748a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return Better1? FT1 : FT2; 3875dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38768a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (!Better1 && !Better2) // Neither is better than the other 387765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return 0; 38788a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 38798a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p10: 3880dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If for each type being considered a given template is at least as 38818a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized for all types and more specialized for some set of types and 3882dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the other template is not more specialized for any types or is not at 38838a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // least as specialized for any types, then the given template is more 38848a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized than the other template. Otherwise, neither template is more 38858a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized than the other. 38868a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Better1 = false; 38878a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Better2 = false; 3888b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor for (unsigned I = 0, N = RefParamComparisons.size(); I != N; ++I) { 38898a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p9: 38908a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // If, for a given type, deduction succeeds in both directions (i.e., the 3891b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // types are identical after the transformations above) and both P and A 3892b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // were reference types (before being replaced with the type referred to 3893b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // above): 3894b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 3895dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // -- if the type from the argument template was an lvalue reference 3896b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // and the type from the parameter template was not, the argument 3897b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // type is considered to be more specialized than the other; 3898b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // otherwise, 3899b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (!RefParamComparisons[I].ArgIsRvalueRef && 3900b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons[I].ParamIsRvalueRef) { 3901b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better2 = true; 3902b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better1) 3903b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3904b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3905b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor } else if (!RefParamComparisons[I].ParamIsRvalueRef && 3906b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons[I].ArgIsRvalueRef) { 3907b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better1 = true; 3908b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better2) 3909b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3910b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3911b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor } 3912dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3913b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // -- if the type from the argument template is more cv-qualified than 3914b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // the type from the parameter template (as described above), the 3915b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // argument type is considered to be more specialized than the 3916b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // other; otherwise, 3917b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor switch (RefParamComparisons[I].Qualifiers) { 3918b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case NeitherMoreQualified: 3919b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor break; 3920dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3921b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case ParamMoreQualified: 3922b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better1 = true; 3923b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better2) 3924b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3925b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3926dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3927b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case ArgMoreQualified: 3928b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better2 = true; 3929b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better1) 3930b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3931b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 39328a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3933dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3934b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // -- neither type is more specialized than the other. 39358a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3936dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 39378a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor assert(!(Better1 && Better2) && "Should have broken out in the loop above"); 393865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (Better1) 393965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return FT1; 39408a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor else if (Better2) 39418a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return FT2; 3942dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 39439da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // FIXME: This mimics what GCC implements, but doesn't match up with the 39449da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // proposed resolution for core issue 692. This area needs to be sorted out, 39459da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // but for now we attempt to maintain compatibility. 39469da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor bool Variadic1 = isVariadicFunctionTemplate(FT1); 39479da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor bool Variadic2 = isVariadicFunctionTemplate(FT2); 39489da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (Variadic1 != Variadic2) 39499da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return Variadic1? FT2 : FT1; 3950dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 39519da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return 0; 395265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor} 395383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 3954d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \brief Determine if the two templates are equivalent. 3955d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregorstatic bool isSameTemplate(TemplateDecl *T1, TemplateDecl *T2) { 3956d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (T1 == T2) 3957d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return true; 3958dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3959d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (!T1 || !T2) 3960d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return false; 3961dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3962d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return T1->getCanonicalDecl() == T2->getCanonicalDecl(); 3963d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor} 3964d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor 3965d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \brief Retrieve the most specialized of the given function template 3966d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specializations. 3967d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3968c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// \param SpecBegin the start iterator of the function template 3969c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// specializations that we will be comparing. 3970d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3971c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// \param SpecEnd the end iterator of the function template 3972c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// specializations, paired with \p SpecBegin. 3973d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3974d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param TPOC the partial ordering context to use to compare the function 3975d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// template specializations. 3976d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 39775c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param NumCallArguments The number of arguments in a call, used only 39785c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// when \c TPOC is \c TPOC_Call. 39795c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 3980dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param Loc the location where the ambiguity or no-specializations 3981d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// diagnostic should occur. 3982d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3983d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param NoneDiag partial diagnostic used to diagnose cases where there are 3984d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// no matching candidates. 3985d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3986d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param AmbigDiag partial diagnostic used to diagnose an ambiguity, if one 3987d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// occurs. 3988d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3989d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param CandidateDiag partial diagnostic used for each function template 3990d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specialization that is a candidate in the ambiguous ordering. One parameter 3991d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// in this diagnostic should be unbound, which will correspond to the string 3992d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// describing the template arguments for the function template specialization. 3993d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3994dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param Index if non-NULL and the result of this function is non-nULL, 3995d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// receives the index corresponding to the resulting function template 3996d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specialization. 3997d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3998dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \returns the most specialized function template specialization, if 3999c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// found. Otherwise, returns SpecEnd. 4000d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 4001dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \todo FIXME: Consider passing in the "also-ran" candidates that failed 4002d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// template argument deduction. 4003c373d48502ca7683ab55385f5bd624d778eb288dJohn McCallUnresolvedSetIterator 4004c373d48502ca7683ab55385f5bd624d778eb288dJohn McCallSema::getMostSpecialized(UnresolvedSetIterator SpecBegin, 40055c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor UnresolvedSetIterator SpecEnd, 4006c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall TemplatePartialOrderingContext TPOC, 40075c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned NumCallArguments, 4008c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall SourceLocation Loc, 4009c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall const PartialDiagnostic &NoneDiag, 4010c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall const PartialDiagnostic &AmbigDiag, 40111be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor const PartialDiagnostic &CandidateDiag, 40126efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu bool Complain, 40136efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu QualType TargetType) { 4014c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall if (SpecBegin == SpecEnd) { 40151be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 40161be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag(Loc, NoneDiag); 4017c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecEnd; 4018d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 4019dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4020dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (SpecBegin + 1 == SpecEnd) 4021c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecBegin; 4022dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4023d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Find the function template that is better than all of the templates it 4024d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // has been compared to. 4025c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall UnresolvedSetIterator Best = SpecBegin; 4026dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionTemplateDecl *BestTemplate 4027c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*Best)->getPrimaryTemplate(); 4028d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor assert(BestTemplate && "Not a function template specialization?"); 4029c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall for (UnresolvedSetIterator I = SpecBegin + 1; I != SpecEnd; ++I) { 4030c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall FunctionTemplateDecl *Challenger 4031c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*I)->getPrimaryTemplate(); 4032d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor assert(Challenger && "Not a function template specialization?"); 4033c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall if (isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, 40345c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Loc, TPOC, NumCallArguments), 4035d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Challenger)) { 4036d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Best = I; 4037d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor BestTemplate = Challenger; 4038d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 4039d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 4040dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4041d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Make sure that the "best" function template is more specialized than all 4042d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // of the others. 4043d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor bool Ambiguous = false; 4044c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { 4045c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall FunctionTemplateDecl *Challenger 4046c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*I)->getPrimaryTemplate(); 4047d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (I != Best && 4048dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi !isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, 40495c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Loc, TPOC, NumCallArguments), 4050d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor BestTemplate)) { 4051d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Ambiguous = true; 4052d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor break; 4053d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 4054d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 4055dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4056d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (!Ambiguous) { 4057d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // We found an answer. Return it. 4058c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return Best; 4059d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 4060dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4061d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Diagnose the ambiguity. 40621be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 40631be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag(Loc, AmbigDiag); 4064dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 40651be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 4066d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // FIXME: Can we order the candidates in some sane way? 40676efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { 40686efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu PartialDiagnostic PD = CandidateDiag; 40696efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu PD << getTemplateArgumentBindingsText( 40701be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor cast<FunctionDecl>(*I)->getPrimaryTemplate()->getTemplateParameters(), 4071c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall *cast<FunctionDecl>(*I)->getTemplateSpecializationArgs()); 40726efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu if (!TargetType.isNull()) 40736efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu HandleFunctionTypeMismatch(PD, cast<FunctionDecl>(*I)->getType(), 40746efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu TargetType); 40756efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu Diag((*I)->getLocation(), PD); 40766efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu } 4077dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4078c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecEnd; 4079d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor} 4080d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor 4081bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \brief Returns the more specialized class template partial specialization 4082bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// according to the rules of partial ordering of class template partial 4083bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// specializations (C++ [temp.class.order]). 4084bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 4085bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \param PS1 the first class template partial specialization 4086bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 4087bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \param PS2 the second class template partial specialization 4088bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 4089bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \returns the more specialized class template partial specialization. If 4090bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// neither partial specialization is more specialized, returns NULL. 4091bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas GregorClassTemplatePartialSpecializationDecl * 4092bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas GregorSema::getMoreSpecializedPartialSpecialization( 4093bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor ClassTemplatePartialSpecializationDecl *PS1, 40945769d6195087229770d7ac90449443e026c47103John McCall ClassTemplatePartialSpecializationDecl *PS2, 40955769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc) { 4096bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // C++ [temp.class.order]p1: 4097bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // For two class template partial specializations, the first is at least as 4098dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // specialized as the second if, given the following rewrite to two 4099dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // function templates, the first function template is at least as 4100dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // specialized as the second according to the ordering rules for function 4101bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // templates (14.6.6.2): 4102bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // - the first function template has the same template parameters as the 4103dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // first partial specialization and has a single function parameter 4104dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // whose type is a class template specialization with the template 4105bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // arguments of the first partial specialization, and 4106bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // - the second function template has the same template parameters as the 4107dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // second partial specialization and has a single function parameter 4108dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // whose type is a class template specialization with the template 4109bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // arguments of the second partial specialization. 4110bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // 411131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // Rather than synthesize function templates, we merely perform the 411231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // equivalent partial ordering by performing deduction directly on 411331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // the template arguments of the class template partial 411431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // specializations. This computation is slightly simpler than the 411531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // general problem of function template partial ordering, because 411631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // class template partial specializations are more constrained. We 411731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // know that every template parameter is deducible from the class 411831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // template partial specialization's template arguments, for 411931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // example. 41205f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 41212a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(Context, Loc); 412231f17ecbef57b5679c017c375db330546b7b5145John McCall 412331f17ecbef57b5679c017c375db330546b7b5145John McCall QualType PT1 = PS1->getInjectedSpecializationType(); 412431f17ecbef57b5679c017c375db330546b7b5145John McCall QualType PT2 = PS2->getInjectedSpecializationType(); 4125dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4126bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // Determine whether PS1 is at least as specialized as PS2 4127bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor Deduced.resize(PS2->getTemplateParameters()->size()); 4128bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl bool Better1 = !DeduceTemplateArgumentsByTypeMatch(*this, 4129bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl PS2->getTemplateParameters(), 41305c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PT2, PT1, Info, Deduced, TDF_None, 4131dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi /*PartialOrdering=*/true, 4132b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*RefParamComparisons=*/0); 41332c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis if (Better1) { 41347e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith SmallVector<TemplateArgument, 4> DeducedArgs(Deduced.begin(),Deduced.end()); 41352c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis InstantiatingTemplate Inst(*this, PS2->getLocation(), PS2, 41367e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith DeducedArgs, Info); 4137dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Better1 = !::FinishTemplateArgumentDeduction(*this, PS2, 4138dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PS1->getTemplateArgs(), 4139516e6e09821a61e8975c787e189949723249e7c5Douglas Gregor Deduced, Info); 41402c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis } 4141dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4142bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // Determine whether PS2 is at least as specialized as PS1 4143db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Deduced.clear(); 4144bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor Deduced.resize(PS1->getTemplateParameters()->size()); 4145bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl bool Better2 = !DeduceTemplateArgumentsByTypeMatch(*this, 4146bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl PS1->getTemplateParameters(), 41475c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PT1, PT2, Info, Deduced, TDF_None, 41485c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor /*PartialOrdering=*/true, 4149b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*RefParamComparisons=*/0); 41502c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis if (Better2) { 41517e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith SmallVector<TemplateArgument, 4> DeducedArgs(Deduced.begin(),Deduced.end()); 41522c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis InstantiatingTemplate Inst(*this, PS1->getLocation(), PS1, 41537e54fb5fcc7d7b8e843501652cf7c19cea6c4c57Richard Smith DeducedArgs, Info); 4154dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Better2 = !::FinishTemplateArgumentDeduction(*this, PS1, 4155dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PS2->getTemplateArgs(), 4156516e6e09821a61e8975c787e189949723249e7c5Douglas Gregor Deduced, Info); 41572c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis } 4158dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4159bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor if (Better1 == Better2) 4160bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor return 0; 4161dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4162bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor return Better1? PS1 : PS2; 4163bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor} 4164bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor 41651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 41666fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4167e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const TemplateArgument &TemplateArg, 4168e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4169ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 4170013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector &Used); 4171031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4172e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 4173031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// expression. 41741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 41756fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4176e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const Expr *E, 4177e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4178ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 4179013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector &Used) { 4180be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor // We can deduce from a pack expansion. 4181be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor if (const PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(E)) 4182be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor E = Expansion->getPattern(); 4183dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 41846098381c29c2693832aa81ef046cf21a49729436Richard Smith // Skip through any implicit casts we added while type-checking, and any 41856098381c29c2693832aa81ef046cf21a49729436Richard Smith // substitutions performed by template alias expansion. 41866098381c29c2693832aa81ef046cf21a49729436Richard Smith while (1) { 41876098381c29c2693832aa81ef046cf21a49729436Richard Smith if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 41886098381c29c2693832aa81ef046cf21a49729436Richard Smith E = ICE->getSubExpr(); 41896098381c29c2693832aa81ef046cf21a49729436Richard Smith else if (const SubstNonTypeTemplateParmExpr *Subst = 41906098381c29c2693832aa81ef046cf21a49729436Richard Smith dyn_cast<SubstNonTypeTemplateParmExpr>(E)) 41916098381c29c2693832aa81ef046cf21a49729436Richard Smith E = Subst->getReplacement(); 41926098381c29c2693832aa81ef046cf21a49729436Richard Smith else 41936098381c29c2693832aa81ef046cf21a49729436Richard Smith break; 41946098381c29c2693832aa81ef046cf21a49729436Richard Smith } 4195dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4196dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // FIXME: if !OnlyDeduced, we have to walk the whole subexpression to 4197e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // find other occurrences of template parameters. 4198f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E); 4199c781f9cd854f3d5d1c826f4a13382c6abca4cff7Douglas Gregor if (!DRE) 4200031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 4201031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 42021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const NonTypeTemplateParmDecl *NTTP 4203031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor = dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); 4204031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor if (!NTTP) 4205031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 4206031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4207ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (NTTP->getDepth() == Depth) 4208ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[NTTP->getIndex()] = true; 4209031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 4210031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4211e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 4212e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// nested name specifier. 4213e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregorstatic void 42146fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4215e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor NestedNameSpecifier *NNS, 4216e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4217ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 4218013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector &Used) { 4219e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!NNS) 4220e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 4221dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 42226fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, NNS->getPrefix(), OnlyDeduced, Depth, 4223ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used); 42246fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, QualType(NNS->getAsType(), 0), 4225ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4226e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor} 4227dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4228e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 4229e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// template name. 4230e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregorstatic void 42316fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4232e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor TemplateName Name, 4233e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4234ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 4235013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector &Used) { 4236e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (TemplateDecl *Template = Name.getAsTemplateDecl()) { 4237e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (TemplateTemplateParmDecl *TTP 4238ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor = dyn_cast<TemplateTemplateParmDecl>(Template)) { 4239ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (TTP->getDepth() == Depth) 4240ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[TTP->getIndex()] = true; 4241ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor } 4242e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 4243e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor } 4244dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4245788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (QualifiedTemplateName *QTN = Name.getAsQualifiedTemplateName()) 42466fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, QTN->getQualifier(), OnlyDeduced, 4247788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Depth, Used); 4248e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) 42496fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, DTN->getQualifier(), OnlyDeduced, 4250ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4251e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor} 4252e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor 4253e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 4254031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// type. 42551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 42566fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, QualType T, 4257e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4258ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 4259013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector &Used) { 4260e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (T.isNull()) 4261e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 4262dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4263031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor // Non-dependent types have nothing deducible 4264031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor if (!T->isDependentType()) 4265031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 4266031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 42676fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis T = Ctx.getCanonicalType(T); 4268031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor switch (T->getTypeClass()) { 4269031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Pointer: 42706fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4271e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<PointerType>(T)->getPointeeType(), 4272e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 4273ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 4274e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 4275031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4276031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4277031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::BlockPointer: 42786fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4279e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<BlockPointerType>(T)->getPointeeType(), 4280e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 4281ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 4282e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 4283031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4284031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4285031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::LValueReference: 4286031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::RValueReference: 42876fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4288e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ReferenceType>(T)->getPointeeType(), 4289e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 4290ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 4291e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 4292031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4293031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4294031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::MemberPointer: { 4295031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor const MemberPointerType *MemPtr = cast<MemberPointerType>(T.getTypePtr()); 42966fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, MemPtr->getPointeeType(), OnlyDeduced, 4297ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 42986fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, QualType(MemPtr->getClass(), 0), 4299ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4300031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4301031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4302031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4303031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::DependentSizedArray: 43046fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4305e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<DependentSizedArrayType>(T)->getSizeExpr(), 4306ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4307031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor // Fall through to check the element type 4308031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4309031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ConstantArray: 4310031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::IncompleteArray: 43116fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4312e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ArrayType>(T)->getElementType(), 4313ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4314031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4315031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4316031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Vector: 4317031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ExtVector: 43186fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4319e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<VectorType>(T)->getElementType(), 4320ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4321031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4322031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 43239cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor case Type::DependentSizedExtVector: { 43249cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor const DependentSizedExtVectorType *VecType 4325f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor = cast<DependentSizedExtVectorType>(T); 43266fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, VecType->getElementType(), OnlyDeduced, 4327ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 43286fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, VecType->getSizeExpr(), OnlyDeduced, 4329ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 43309cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor break; 43319cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor } 43329cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor 4333031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::FunctionProto: { 4334f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor const FunctionProtoType *Proto = cast<FunctionProtoType>(T); 43356fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Proto->getResultType(), OnlyDeduced, 4336ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4337031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor for (unsigned I = 0, N = Proto->getNumArgs(); I != N; ++I) 43386fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Proto->getArgType(I), OnlyDeduced, 4339ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4340031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4341031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4342031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4343ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor case Type::TemplateTypeParm: { 4344ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor const TemplateTypeParmType *TTP = cast<TemplateTypeParmType>(T); 4345ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (TTP->getDepth() == Depth) 4346ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[TTP->getIndex()] = true; 4347031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4348ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor } 4349031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 43500bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor case Type::SubstTemplateTypeParmPack: { 43510bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor const SubstTemplateTypeParmPackType *Subst 43520bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor = cast<SubstTemplateTypeParmPackType>(T); 43536fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 43540bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor QualType(Subst->getReplacedParameter(), 0), 43550bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor OnlyDeduced, Depth, Used); 43566fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Subst->getArgumentPack(), 43570bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor OnlyDeduced, Depth, Used); 43580bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor break; 43590bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor } 43600bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor 436131f17ecbef57b5679c017c375db330546b7b5145John McCall case Type::InjectedClassName: 436231f17ecbef57b5679c017c375db330546b7b5145John McCall T = cast<InjectedClassNameType>(T)->getInjectedSpecializationType(); 436331f17ecbef57b5679c017c375db330546b7b5145John McCall // fall through 436431f17ecbef57b5679c017c375db330546b7b5145John McCall 4365031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::TemplateSpecialization: { 43661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const TemplateSpecializationType *Spec 4367f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor = cast<TemplateSpecializationType>(T); 43686fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Spec->getTemplateName(), OnlyDeduced, 4369ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4370dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 43717b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 4372dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 4373dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 43747b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 4375dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 43767b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) 43777b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor break; 43787b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 4379e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) 43806fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Spec->getArg(I), OnlyDeduced, Depth, 4381ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used); 4382e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor break; 4383e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor } 43841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4385e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor case Type::Complex: 4386e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!OnlyDeduced) 43876fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4388e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ComplexType>(T)->getElementType(), 4389ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4390e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor break; 4391031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4392b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman case Type::Atomic: 4393b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman if (!OnlyDeduced) 43946fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4395b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman cast<AtomicType>(T)->getValueType(), 4396b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman OnlyDeduced, Depth, Used); 4397b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman break; 4398b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 43994714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor case Type::DependentName: 4400e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!OnlyDeduced) 44016fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 44024714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor cast<DependentNameType>(T)->getQualifier(), 4403ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4404031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4405031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 440633500955d731c73717af52088b7fc0e7a85681e7John McCall case Type::DependentTemplateSpecialization: { 440733500955d731c73717af52088b7fc0e7a85681e7John McCall const DependentTemplateSpecializationType *Spec 440833500955d731c73717af52088b7fc0e7a85681e7John McCall = cast<DependentTemplateSpecializationType>(T); 440933500955d731c73717af52088b7fc0e7a85681e7John McCall if (!OnlyDeduced) 44106fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Spec->getQualifier(), 441133500955d731c73717af52088b7fc0e7a85681e7John McCall OnlyDeduced, Depth, Used); 4412dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 44137b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 4414dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 4415dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 44167b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 4417dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 44187b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) 44197b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor break; 44207b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 442133500955d731c73717af52088b7fc0e7a85681e7John McCall for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) 44226fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Spec->getArg(I), OnlyDeduced, Depth, 442333500955d731c73717af52088b7fc0e7a85681e7John McCall Used); 442433500955d731c73717af52088b7fc0e7a85681e7John McCall break; 442533500955d731c73717af52088b7fc0e7a85681e7John McCall } 442633500955d731c73717af52088b7fc0e7a85681e7John McCall 4427ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::TypeOf: 4428ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 44296fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4430ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<TypeOfType>(T)->getUnderlyingType(), 4431ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 4432ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 4433ad5e73887052193afda72db8efcb812bd083a4a8John McCall 4434ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::TypeOfExpr: 4435ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 44366fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4437ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<TypeOfExprType>(T)->getUnderlyingExpr(), 4438ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 4439ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 4440ad5e73887052193afda72db8efcb812bd083a4a8John McCall 4441ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::Decltype: 4442ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 44436fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4444ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<DecltypeType>(T)->getUnderlyingExpr(), 4445ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 4446ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 4447ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt 4448ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt case Type::UnaryTransform: 4449ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt if (!OnlyDeduced) 44506fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4451ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt cast<UnaryTransformType>(T)->getUnderlyingType(), 4452ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt OnlyDeduced, Depth, Used); 4453ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt break; 4454ad5e73887052193afda72db8efcb812bd083a4a8John McCall 44557536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor case Type::PackExpansion: 44566fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 44577536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor cast<PackExpansionType>(T)->getPattern(), 44587536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor OnlyDeduced, Depth, Used); 44597536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor break; 44607536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor 446134b41d939a1328f484511c6002ba2456db879a29Richard Smith case Type::Auto: 44626fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 446334b41d939a1328f484511c6002ba2456db879a29Richard Smith cast<AutoType>(T)->getDeducedType(), 446434b41d939a1328f484511c6002ba2456db879a29Richard Smith OnlyDeduced, Depth, Used); 446534b41d939a1328f484511c6002ba2456db879a29Richard Smith 4466e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // None of these types have any template parameters in them. 4467031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Builtin: 4468031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::VariableArray: 4469031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::FunctionNoProto: 4470031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Record: 4471031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Enum: 4472031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ObjCInterface: 4473c12c5bba6ceb6acd4e51e7a0fc03257da9cfd44eJohn McCall case Type::ObjCObject: 4474d1b3c2dd5bc1f3103bee6137957aa7c5f8f2f0bcSteve Naroff case Type::ObjCObjectPointer: 4475ed97649e9574b9d854fa4d6109c9333ae0993554John McCall case Type::UnresolvedUsing: 4476031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define TYPE(Class, Base) 4477031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define ABSTRACT_TYPE(Class, Base) 4478031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define DEPENDENT_TYPE(Class, Base) 4479031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4480031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#include "clang/AST/TypeNodes.def" 4481031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4482031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4483031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 4484031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4485e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by this 4486031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// template argument. 44871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 44886fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4489e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const TemplateArgument &TemplateArg, 4490e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4491ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 4492013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector &Used) { 4493031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor switch (TemplateArg.getKind()) { 4494031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Null: 4495031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Integral: 4496d2008e2c80d6c9282044ec873a937a17a0f33579Douglas Gregor case TemplateArgument::Declaration: 4497031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 44981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4499031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Type: 45006fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, TemplateArg.getAsType(), OnlyDeduced, 4501ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4502031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4503031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4504788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 4505a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 45066fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4507dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArg.getAsTemplateOrTemplatePattern(), 4508788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor OnlyDeduced, Depth, Used); 4509031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4510031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4511031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Expression: 45126fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, TemplateArg.getAsExpr(), OnlyDeduced, 4513ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4514031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4515dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4516d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson case TemplateArgument::Pack: 4517e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor for (TemplateArgument::pack_iterator P = TemplateArg.pack_begin(), 4518e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor PEnd = TemplateArg.pack_end(); 4519e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor P != PEnd; ++P) 45206fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, *P, OnlyDeduced, Depth, Used); 4521d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson break; 4522031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4523031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 4524031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 452516ae9de07730832945204877d752db7f1c070962James Dennett/// \brief Mark which template parameters can be deduced from a given 4526031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// template argument list. 4527031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// 4528031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \param TemplateArgs the template argument list from which template 4529031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// parameters will be deduced. 4530031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// 453116ae9de07730832945204877d752db7f1c070962James Dennett/// \param Used a bit vector whose elements will be set to \c true 4532031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// to indicate when the corresponding template parameter will be 4533031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// deduced. 45341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid 4535e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorSema::MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs, 4536ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor bool OnlyDeduced, unsigned Depth, 4537013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector &Used) { 45387b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 4539dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 4540dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 45417b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 4542dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 45437b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(TemplateArgs.data(), TemplateArgs.size())) 45447b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return; 45457b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 4546031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) 45476fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(Context, TemplateArgs[I], OnlyDeduced, 4548ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4549031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 455063f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor 455163f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor/// \brief Marks all of the template parameters that will be deduced by a 455263f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor/// call to the given function template. 4553dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumivoid 45546fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisSema::MarkDeducedTemplateParameters(ASTContext &Ctx, 45556fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis FunctionTemplateDecl *FunctionTemplate, 4556013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector &Deduced) { 4557dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateParameterList *TemplateParams 455863f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor = FunctionTemplate->getTemplateParameters(); 455963f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor Deduced.clear(); 456063f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor Deduced.resize(TemplateParams->size()); 4561dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 456263f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 456363f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) 45646fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(Ctx, Function->getParamDecl(I)->getType(), 4565ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor true, TemplateParams->getDepth(), Deduced); 456663f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor} 4567dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4568dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregorbool hasDeducibleTemplateParameters(Sema &S, 4569dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor FunctionTemplateDecl *FunctionTemplate, 4570dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType T) { 4571dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (!T->isDependentType()) 4572dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor return false; 4573dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4574dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor TemplateParameterList *TemplateParams 4575dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor = FunctionTemplate->getTemplateParameters(); 4576013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer llvm::SmallBitVector Deduced(TemplateParams->size()); 45776fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, T, true, TemplateParams->getDepth(), 4578dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor Deduced); 4579dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4580013b3668b67c8cb3ad2ee516c5607a3eba11829fBenjamin Kramer return Deduced.any(); 4581dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor} 4582