SemaTemplateDeduction.cpp revision 74fe66181db91d45d48f57abe325ea487e32ddbc
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" 23e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor#include "llvm/ADT/BitVector.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) { 140199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (ImplicitCastExpr *IC = dyn_cast<ImplicitCastExpr>(E)) 141199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor E = IC->getSubExpr(); 1421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 143199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 144199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor return dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); 1451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 146199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor return 0; 147199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor} 148199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1490d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// \brief Determine whether two declaration pointers refer to the same 1500d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// declaration. 1510d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregorstatic bool isSameDeclaration(Decl *X, Decl *Y) { 1520d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (!X || !Y) 1530d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return !X && !Y; 154dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1550d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (NamedDecl *NX = dyn_cast<NamedDecl>(X)) 1560d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X = NX->getUnderlyingDecl(); 1570d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (NamedDecl *NY = dyn_cast<NamedDecl>(Y)) 1580d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y = NY->getUnderlyingDecl(); 159dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1600d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X->getCanonicalDecl() == Y->getCanonicalDecl(); 1610d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor} 1620d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 1630d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// \brief Verify that the given, deduced template arguments are compatible. 1640d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// 1650d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// \returns The deduced template argument, or a NULL template argument if 1660d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// the deduced template arguments were incompatible. 167dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic DeducedTemplateArgument 1680d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas GregorcheckDeducedTemplateArguments(ASTContext &Context, 1690d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor const DeducedTemplateArgument &X, 1700d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor const DeducedTemplateArgument &Y) { 1710d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // We have no deduction for one or both of the arguments; they're compatible. 1720d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (X.isNull()) 1730d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return Y; 1740d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.isNull()) 175dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return X; 1760d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 1770d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor switch (X.getKind()) { 1780d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Null: 1790d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor llvm_unreachable("Non-deduced template arguments handled above"); 1800d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 1810d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Type: 1820d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If two template type arguments have the same type, they're compatible. 1830d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Type && 1840d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Context.hasSameType(X.getAsType(), Y.getAsType())) 1850d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 186dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1870d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 188dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1890d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Integral: 1900d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced a constant in one case and either a dependent expression or 1910d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // declaration in another case, keep the integral constant. 1920d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If both are integral constants with the same value, keep that value. 1930d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Expression || 1940d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.getKind() == TemplateArgument::Declaration || 1950d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor (Y.getKind() == TemplateArgument::Integral && 1960d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor hasSameExtendedValue(*X.getAsIntegral(), *Y.getAsIntegral()))) 197dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeducedTemplateArgument(X, 1980d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X.wasDeducedFromArrayBound() && 1990d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.wasDeducedFromArrayBound()); 2000d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 2010d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 2020d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 203dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2040d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Template: 2050d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Template && 2060d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Context.hasSameTemplateName(X.getAsTemplate(), Y.getAsTemplate())) 2070d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 208dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2090d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 210dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeducedTemplateArgument(); 211a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 212a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 213a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor if (Y.getKind() == TemplateArgument::TemplateExpansion && 214dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Context.hasSameTemplateName(X.getAsTemplateOrTemplatePattern(), 215a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Y.getAsTemplateOrTemplatePattern())) 216a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor return X; 217dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 218a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor // All other combinations are incompatible. 219dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeducedTemplateArgument(); 220a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 2210d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Expression: 222dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we deduced a dependent expression in one case and either an integral 223dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // constant or a declaration in another case, keep the integral constant 2240d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // or declaration. 2250d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Integral || 2260d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.getKind() == TemplateArgument::Declaration) 2270d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(Y, X.wasDeducedFromArrayBound() && 2280d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.wasDeducedFromArrayBound()); 229dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2300d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Expression) { 2310d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // Compare the expressions for equality 2320d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor llvm::FoldingSetNodeID ID1, ID2; 2330d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X.getAsExpr()->Profile(ID1, Context, true); 2340d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.getAsExpr()->Profile(ID2, Context, true); 2350d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (ID1 == ID2) 2360d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 2370d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor } 238dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2390d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 2400d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 241dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2420d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Declaration: 2430d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced a declaration and a dependent expression, keep the 2440d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // declaration. 2450d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Expression) 2460d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 247dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2480d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced a declaration and an integral constant, keep the 2490d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // integral constant. 2500d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Integral) 2510d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return Y; 252dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2530d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced two declarations, make sure they they refer to the 2540d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // same declaration. 2550d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Declaration && 2560d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor isSameDeclaration(X.getAsDecl(), Y.getAsDecl())) 2570d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 258dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2590d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 2600d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 261dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2620d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Pack: 2630d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() != TemplateArgument::Pack || 2640d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X.pack_size() != Y.pack_size()) 2650d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 266dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 267dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (TemplateArgument::pack_iterator XA = X.pack_begin(), 2680d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor XAEnd = X.pack_end(), 2690d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor YA = Y.pack_begin(); 2700d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor XA != XAEnd; ++XA, ++YA) { 271dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (checkDeducedTemplateArguments(Context, 272dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument(*XA, X.wasDeducedFromArrayBound()), 273135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor DeducedTemplateArgument(*YA, Y.wasDeducedFromArrayBound())) 274135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor .isNull()) 2750d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 2760d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor } 277dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2780d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 2790d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor } 280dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2810d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 2820d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor} 2830d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 2841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Deduce the value of the given non-type template parameter 285199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// from the given constant. 286f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 287a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceNonTypeTemplateArgument(Sema &S, 2881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NonTypeTemplateParmDecl *NTTP, 2899d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor llvm::APSInt Value, QualType ValueType, 29002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor bool DeducedFromArrayBound, 2912a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 2925f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 2931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 294199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument with depth > 0"); 2951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2960d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(Value, ValueType, DeducedFromArrayBound); 297dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 2980d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()], 2990d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 3000d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 301f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.Param = NTTP; 302f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Deduced[NTTP->getIndex()]; 3030d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 304dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 305f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 306dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3070d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()] = Result; 308f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 309199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor} 310199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 3111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Deduce the value of the given non-type template parameter 312199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// from the given type- or value-dependent expression. 313199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// 314199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// \returns true if deduction succeeded, false otherwise. 315f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 316a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceNonTypeTemplateArgument(Sema &S, 317f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor NonTypeTemplateParmDecl *NTTP, 318f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Expr *Value, 3192a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3205f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 3211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 322199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument with depth > 0"); 323199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor assert((Value->isTypeDependent() || Value->isValueDependent()) && 324199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Expression template argument must be type- or value-dependent."); 3251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3260d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(Value); 327dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 328dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Deduced[NTTP->getIndex()], 3290d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 330dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3310d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 3320d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = NTTP; 3330d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[NTTP->getIndex()]; 3340d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 335dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 3369eea08ba72f8b1e7faf38e43376b9157fc4a2af2Douglas Gregor } 337dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3380d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()] = Result; 339f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 340199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor} 341199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 34215755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// \brief Deduce the value of the given non-type template parameter 34315755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// from the given declaration. 34415755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// 34515755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// \returns true if deduction succeeded, false otherwise. 34615755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregorstatic Sema::TemplateDeductionResult 347a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceNonTypeTemplateArgument(Sema &S, 34815755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor NonTypeTemplateParmDecl *NTTP, 34915755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor Decl *D, 3502a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3515f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 35215755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor assert(NTTP->getDepth() == 0 && 35315755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor "Cannot deduce non-type template argument with depth > 0"); 354dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3550d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(D? D->getCanonicalDecl() : 0); 356dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 3570d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()], 3580d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 3590d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 3600d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = NTTP; 3610d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[NTTP->getIndex()]; 3620d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 363dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 36415755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor } 365dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3660d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()] = Result; 36715755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor return Sema::TDK_Success; 36815755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor} 36915755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor 370f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 371a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 372db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor TemplateParameterList *TemplateParams, 373f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateName Param, 374f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateName Arg, 3752a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3765f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 377d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor TemplateDecl *ParamDecl = Param.getAsTemplateDecl(); 378db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (!ParamDecl) { 379db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // The parameter type is dependent and is not a template template parameter, 380db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // so there is nothing that we can deduce. 381db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor return Sema::TDK_Success; 382f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 383dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 384db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (TemplateTemplateParmDecl *TempParam 385db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor = dyn_cast<TemplateTemplateParmDecl>(ParamDecl)) { 3860d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(S.Context.getCanonicalTemplateName(Arg)); 387dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 3880d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[TempParam->getIndex()], 3890d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 3900d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 3910d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = TempParam; 3920d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[TempParam->getIndex()]; 3930d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 394dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 395db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor } 396dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3970d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[TempParam->getIndex()] = Result; 398dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Success; 399f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 400dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 401db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // Verify that the two template names are equivalent. 402a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth if (S.Context.hasSameTemplateName(Param, Arg)) 403db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor return Sema::TDK_Success; 404dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 405db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // Mismatch of non-dependent template parameter to argument. 406db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Info.FirstArg = TemplateArgument(Param); 407db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Info.SecondArg = TemplateArgument(Arg); 408db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor return Sema::TDK_NonDeducedMismatch; 409d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor} 410d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 4111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Deduce the template arguments by comparing the template parameter 412de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// type (which is a template-id) with the template argument type. 413de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 414a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth/// \param S the Sema 415de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 416de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param TemplateParams the template parameters that we are deducing 417de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 418de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Param the parameter type 419de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 420de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Arg the argument type 421de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 422de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Info information about the template argument deduction itself 423de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 424de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Deduced the deduced template arguments 425de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 426de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \returns the result of template argument deduction so far. Note that a 427de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// "success" result means that template argument deduction has not yet failed, 428de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// but it may still fail, later, for other reasons. 429de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregorstatic Sema::TemplateDeductionResult 430a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 431de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor TemplateParameterList *TemplateParams, 432de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const TemplateSpecializationType *Param, 433de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor QualType Arg, 4342a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 4355f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 436467b27b9a24bdc823218ad1ad0e37673b6cc1e83John McCall assert(Arg.isCanonical() && "Argument type must be canonical"); 4371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 438de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Check whether the template argument is a dependent template-id. 4391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateSpecializationType *SpecArg 440de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor = dyn_cast<TemplateSpecializationType>(Arg)) { 441de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Perform template argument deduction for the template name. 442de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Sema::TemplateDeductionResult Result 443a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 444de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Param->getTemplateName(), 445de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor SpecArg->getTemplateName(), 446de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced)) 447de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 4481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 450de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Perform template argument deduction on each template 4510972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor // argument. Ignore any missing/extra arguments, since they could be 4520972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor // filled in by default arguments. 453dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 454dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Param->getArgs(), Param->getNumArgs(), 4550972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor SpecArg->getArgs(), SpecArg->getNumArgs(), 4560972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor Info, Deduced, 4570972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor /*NumberOfArgumentsMustMatch=*/false); 458de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 4591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 460de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If the argument type is a class template specialization, we 461de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // perform template argument deduction using its template 462de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // arguments. 463de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const RecordType *RecordArg = dyn_cast<RecordType>(Arg); 464de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!RecordArg) 465de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_NonDeducedMismatch; 4661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump ClassTemplateSpecializationDecl *SpecArg 468de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor = dyn_cast<ClassTemplateSpecializationDecl>(RecordArg->getDecl()); 469de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!SpecArg) 470de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_NonDeducedMismatch; 4711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 472de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Perform template argument deduction for the template name. 473de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Sema::TemplateDeductionResult Result 474a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, 475db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor TemplateParams, 476de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Param->getTemplateName(), 477de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor TemplateName(SpecArg->getSpecializedTemplate()), 478de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced)) 479de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 4801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 48120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Perform template argument deduction for the template arguments. 482dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 48320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Param->getArgs(), Param->getNumArgs(), 48420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor SpecArg->getTemplateArgs().data(), 48520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor SpecArg->getTemplateArgs().size(), 48620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Info, Deduced); 487de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor} 488de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor 489cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall/// \brief Determines whether the given type is an opaque type that 490cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall/// might be more qualified when instantiated. 491cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCallstatic bool IsPossiblyOpaquelyQualifiedType(QualType T) { 492cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall switch (T->getTypeClass()) { 493cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::TypeOfExpr: 494cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::TypeOf: 495cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::DependentName: 496cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::Decltype: 497cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::UnresolvedUsing: 49862c28c831bbf207cc36e683e7c321fc33bf8928cJohn McCall case Type::TemplateTypeParm: 499cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall return true; 500cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall 501cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::ConstantArray: 502cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::IncompleteArray: 503cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::VariableArray: 504cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::DependentSizedArray: 505cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall return IsPossiblyOpaquelyQualifiedType( 506cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall cast<ArrayType>(T)->getElementType()); 507cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall 508cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall default: 509cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall return false; 510cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall } 511cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall} 512cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall 513d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor/// \brief Retrieve the depth and index of a template parameter. 514dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic std::pair<unsigned, unsigned> 515d3731198193eee92796ddeb493973b7a598b003eDouglas GregorgetDepthAndIndex(NamedDecl *ND) { 516603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(ND)) 517603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return std::make_pair(TTP->getDepth(), TTP->getIndex()); 518dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 519603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(ND)) 520603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return std::make_pair(NTTP->getDepth(), NTTP->getIndex()); 521dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 522603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(ND); 523603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return std::make_pair(TTP->getDepth(), TTP->getIndex()); 524603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor} 525603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 526d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor/// \brief Retrieve the depth and index of an unexpanded parameter pack. 527dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic std::pair<unsigned, unsigned> 528d3731198193eee92796ddeb493973b7a598b003eDouglas GregorgetDepthAndIndex(UnexpandedParameterPack UPP) { 529d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (const TemplateTypeParmType *TTP 530d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor = UPP.first.dyn_cast<const TemplateTypeParmType *>()) 531d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor return std::make_pair(TTP->getDepth(), TTP->getIndex()); 532dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 533d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor return getDepthAndIndex(UPP.first.get<NamedDecl *>()); 534d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor} 535d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor 536603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \brief Helper function to build a TemplateParameter when we don't 537603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// know its type statically. 538603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregorstatic TemplateParameter makeTemplateParameter(Decl *D) { 539603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(D)) 540603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return TemplateParameter(TTP); 541603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor else if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) 542603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return TemplateParameter(NTTP); 543dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 544603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return TemplateParameter(cast<TemplateTemplateParmDecl>(D)); 545603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor} 546603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 5475429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor/// \brief Prepare to perform template argument deduction for all of the 5485429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor/// arguments in a set of argument packs. 549dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic void PrepareArgumentPackDeduction(Sema &S, 5505f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 5515f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner const SmallVectorImpl<unsigned> &PackIndices, 5525f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, 5535f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl< 5545f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> > &NewlyDeducedPacks) { 5555429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // Save the deduced template arguments for each parameter pack expanded 5565429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // by this pack expansion, then clear out the deduction. 5575429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 5585429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // Save the previously-deduced argument pack, then clear it out so that we 5595429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // can deduce a new argument pack. 5605429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor SavedPacks[I] = Deduced[PackIndices[I]]; 561dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Deduced[PackIndices[I]] = TemplateArgument(); 562dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5635429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // If the template arugment pack was explicitly specified, add that to 5645429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // the set of deduced arguments. 5655429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor const TemplateArgument *ExplicitArgs; 5665429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor unsigned NumExplicitArgs; 567dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NamedDecl *PartiallySubstitutedPack 5685429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor = S.CurrentInstantiationScope->getPartiallySubstitutedPack( 5695429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor &ExplicitArgs, 5705429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor &NumExplicitArgs)) { 5715429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor if (getDepthAndIndex(PartiallySubstitutedPack).second == PackIndices[I]) 572dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks[I].append(ExplicitArgs, 5735429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor ExplicitArgs + NumExplicitArgs); 5745429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor } 5755429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor } 5765429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor} 5775429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor 5780216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor/// \brief Finish template argument deduction for a set of argument packs, 5790216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor/// producing the argument packs and checking for consistency with prior 5800216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor/// deductions. 5810216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregorstatic Sema::TemplateDeductionResult 5820216f8121df32b320cab659d5b703fee50cdfda5Douglas GregorFinishArgumentPackDeduction(Sema &S, 5830216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor TemplateParameterList *TemplateParams, 5840216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor bool HasAnyArguments, 5855f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 5865f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner const SmallVectorImpl<unsigned> &PackIndices, 5875f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, 5885f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl< 5895f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> > &NewlyDeducedPacks, 5900216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor TemplateDeductionInfo &Info) { 5910216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 5920216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // pack expansion. 5930216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 5940216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (HasAnyArguments && NewlyDeducedPacks[I].empty()) { 5950216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // We were not able to deduce anything for this parameter pack, 5960216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // so just restore the saved argument pack. 5970216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced[PackIndices[I]] = SavedPacks[I]; 5980216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor continue; 5990216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 600dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6010216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor DeducedTemplateArgument NewPack; 602dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6030216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (NewlyDeducedPacks[I].empty()) { 6040216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // If we deduced an empty argument pack, create it now. 6050216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewPack = DeducedTemplateArgument(TemplateArgument(0, 0)); 6060216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } else { 6070216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor TemplateArgument *ArgumentPack 608203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor = new (S.Context) TemplateArgument [NewlyDeducedPacks[I].size()]; 6090216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor std::copy(NewlyDeducedPacks[I].begin(), NewlyDeducedPacks[I].end(), 6100216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor ArgumentPack); 6110216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewPack 612203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor = DeducedTemplateArgument(TemplateArgument(ArgumentPack, 613203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor NewlyDeducedPacks[I].size()), 614dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks[I][0].wasDeducedFromArrayBound()); 6150216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 616dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6170216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor DeducedTemplateArgument Result 6180216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor = checkDeducedTemplateArguments(S.Context, SavedPacks[I], NewPack); 6190216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Result.isNull()) { 6200216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Info.Param 6210216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor = makeTemplateParameter(TemplateParams->getParam(PackIndices[I])); 6220216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Info.FirstArg = SavedPacks[I]; 6230216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Info.SecondArg = NewPack; 6240216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor return Sema::TDK_Inconsistent; 6250216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 626dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6270216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced[PackIndices[I]] = Result; 6280216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 629dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6300216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor return Sema::TDK_Success; 6310216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor} 6320216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor 633603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \brief Deduce the template arguments by comparing the list of parameter 634dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// types to the list of argument types, as in the parameter-type-lists of 635dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// function types (C++ [temp.deduct.type]p10). 636603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 637603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param S The semantic analysis object within which we are deducing 638603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 639603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param TemplateParams The template parameters that we are deducing 640603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 641603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Params The list of parameter types 642603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 643603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param NumParams The number of types in \c Params 644603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 645603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Args The list of argument types 646603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 647603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param NumArgs The number of types in \c Args 648603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 649603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Info information about the template argument deduction itself 650603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 651603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Deduced the deduced template arguments 652603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 653603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe 654603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// how template argument deduction is performed. 655603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 6565c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param PartialOrdering If true, we are performing template argument 657dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// deduction for during partial ordering for a call 6585c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// (C++0x [temp.deduct.partial]). 6595c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 660b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \param RefParamComparisons If we're performing template argument deduction 6615c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering, the set of qualifier comparisons. 6625c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 663603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \returns the result of template argument deduction so far. Note that a 664603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// "success" result means that template argument deduction has not yet failed, 665603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// but it may still fail, later, for other reasons. 666603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregorstatic Sema::TemplateDeductionResult 667603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas GregorDeduceTemplateArguments(Sema &S, 668603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateParameterList *TemplateParams, 669603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor const QualType *Params, unsigned NumParams, 670603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor const QualType *Args, unsigned NumArgs, 671603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateDeductionInfo &Info, 6725f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 6735c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned TDF, 6745c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool PartialOrdering = false, 6755f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<RefParamPartialOrderingComparison> * 676b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons = 0) { 6770bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor // Fast-path check to see if we have too many/too few arguments. 6780bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor if (NumParams != NumArgs && 6790bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor !(NumParams && isa<PackExpansionType>(Params[NumParams - 1])) && 6800bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor !(NumArgs && isa<PackExpansionType>(Args[NumArgs - 1]))) 6813cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 682dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 683603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // C++0x [temp.deduct.type]p10: 684dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Similarly, if P has a form that contains (T), then each parameter type 685dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Pi of the respective parameter-type- list of P is compared with the 686dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // corresponding parameter type Ai of the corresponding parameter-type-list 687dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // of A. [...] 688603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor unsigned ArgIdx = 0, ParamIdx = 0; 689603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (; ParamIdx != NumParams; ++ParamIdx) { 690603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Check argument types. 691dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const PackExpansionType *Expansion 692603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor = dyn_cast<PackExpansionType>(Params[ParamIdx]); 693603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (!Expansion) { 694603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Simple case: compare the parameter and argument types at this point. 695dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 696603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Make sure we have an argument. 697603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (ArgIdx >= NumArgs) 6983cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 699dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 70077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (isa<PackExpansionType>(Args[ArgIdx])) { 70177d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // C++0x [temp.deduct.type]p22: 70277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the original function parameter associated with A is a function 70377d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // parameter pack and the function parameter associated with P is not 70477d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // a function parameter pack, then template argument deduction fails. 70577d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor return Sema::TDK_NonDeducedMismatch; 70677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor } 707dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 708603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (Sema::TemplateDeductionResult Result 709bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 710bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Params[ParamIdx], Args[ArgIdx], 711bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF, 712bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl PartialOrdering, 713bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons)) 714603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Result; 715dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 716603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor ++ArgIdx; 717603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor continue; 718603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 719dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 7207d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // C++0x [temp.deduct.type]p5: 7217d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // The non-deduced contexts are: 722dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - A function parameter pack that does not occur at the end of the 7237d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // parameter-declaration-clause. 7247d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor if (ParamIdx + 1 < NumParams) 7257d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor return Sema::TDK_Success; 7267d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor 727603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // C++0x [temp.deduct.type]p10: 728dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the parameter-declaration corresponding to Pi is a function 729603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // parameter pack, then the type of its declarator- id is compared with 730dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // each remaining parameter type in the parameter-type-list of A. Each 731603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // comparison deduces template arguments for subsequent positions in the 732603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // template parameter packs expanded by the function parameter pack. 733dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 734603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Compute the set of template parameter indices that correspond to 735603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // parameter packs expanded by the pack expansion. 7365f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<unsigned, 2> PackIndices; 737603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor QualType Pattern = Expansion->getPattern(); 738603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor { 739603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::BitVector SawIndices(TemplateParams->size()); 7405f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UnexpandedParameterPack, 2> Unexpanded; 741603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor S.collectUnexpandedParameterPacks(Pattern, Unexpanded); 742603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 743603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor unsigned Depth, Index; 744603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 745603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 746603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor SawIndices[Index] = true; 747603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor PackIndices.push_back(Index); 748603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 749603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 750603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 751603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 752603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 753d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Keep track of the deduced template arguments for each parameter pack 754dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 755d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template argument (the inner SmallVectors). 7565f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> 757d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 7585f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 2> 7595429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor SavedPacks(PackIndices.size()); 760dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, 7615429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks); 762dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 763603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor bool HasAnyArguments = false; 764603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (; ArgIdx < NumArgs; ++ArgIdx) { 765603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor HasAnyArguments = true; 766dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 767603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Deduce template arguments from the pattern. 768dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (Sema::TemplateDeductionResult Result 769bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, Pattern, 770bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Args[ArgIdx], Info, Deduced, 771bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TDF, PartialOrdering, 772bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons)) 773603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Result; 774dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 775603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 776603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 777603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // for that pack, then clear out the deduced argument. 778603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 779603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 780603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (!DeducedArg.isNull()) { 781603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 782603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor DeducedArg = DeducedTemplateArgument(); 783603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 784603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 785603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 786dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 787603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 788603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // pack expansion. 7890216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 790dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(S, TemplateParams, HasAnyArguments, 7910216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 7920216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 793dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 794603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 795dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 796603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Make sure we don't have any extra arguments. 797603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (ArgIdx < NumArgs) 7983cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 799dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 800603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Sema::TDK_Success; 801603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor} 802603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 80361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor/// \brief Determine whether the parameter has qualifiers that are either 80461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor/// inconsistent with or a superset of the argument's qualifiers. 80561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregorstatic bool hasInconsistentOrSupersetQualifiersOf(QualType ParamType, 80661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor QualType ArgType) { 80761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ParamQs = ParamType.getQualifiers(); 80861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ArgQs = ArgType.getQualifiers(); 80961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 81061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs == ArgQs) 81161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return false; 81261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 81361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Mismatched (but not missing) Objective-C GC attributes. 81461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.getObjCGCAttr() != ArgQs.getObjCGCAttr() && 81561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ParamQs.hasObjCGCAttr()) 81661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return true; 81761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 81861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Mismatched (but not missing) address spaces. 81961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.getAddressSpace() != ArgQs.getAddressSpace() && 82061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ParamQs.hasAddressSpace()) 82161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return true; 82261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 823f85e193739c953358c865005855253af4f68a497John McCall // Mismatched (but not missing) Objective-C lifetime qualifiers. 824f85e193739c953358c865005855253af4f68a497John McCall if (ParamQs.getObjCLifetime() != ArgQs.getObjCLifetime() && 825f85e193739c953358c865005855253af4f68a497John McCall ParamQs.hasObjCLifetime()) 826f85e193739c953358c865005855253af4f68a497John McCall return true; 827f85e193739c953358c865005855253af4f68a497John McCall 82861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // CVR qualifier superset. 82961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return (ParamQs.getCVRQualifiers() != ArgQs.getCVRQualifiers()) && 83061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ((ParamQs.getCVRQualifiers() | ArgQs.getCVRQualifiers()) 83161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor == ParamQs.getCVRQualifiers()); 83261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor} 83361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 834500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \brief Deduce the template arguments by comparing the parameter type and 835500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// the argument type (C++ [temp.deduct.type]). 836500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 837a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth/// \param S the semantic analysis object within which we are deducing 838500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 839500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param TemplateParams the template parameters that we are deducing 840500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 841500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param ParamIn the parameter type 842500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 843500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param ArgIn the argument type 844500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 845500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param Info information about the template argument deduction itself 846500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 847500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param Deduced the deduced template arguments 848500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 849508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor/// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe 8501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// how template argument deduction is performed. 851500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 8525c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param PartialOrdering Whether we're performing template argument deduction 8535c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering (C++0x [temp.deduct.partial]). 8545c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 855b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \param RefParamComparisons If we're performing template argument deduction 8565c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering, the set of qualifier comparisons. 8575c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 858500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \returns the result of template argument deduction so far. Note that a 859500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// "success" result means that template argument deduction has not yet failed, 860500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// but it may still fail, later, for other reasons. 861f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 862bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian RedlDeduceTemplateArgumentsByTypeMatch(Sema &S, 863bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TemplateParameterList *TemplateParams, 864bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl QualType ParamIn, QualType ArgIn, 865bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TemplateDeductionInfo &Info, 866bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl SmallVectorImpl<DeducedTemplateArgument> &Deduced, 867bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl unsigned TDF, 868bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl bool PartialOrdering, 869bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl SmallVectorImpl<RefParamPartialOrderingComparison> * 870bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons) { 8710b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // We only want to look at the canonical types, since typedefs and 8720b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // sugar are not part of template argument deduction. 873a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth QualType Param = S.Context.getCanonicalType(ParamIn); 874a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth QualType Arg = S.Context.getCanonicalType(ArgIn); 8750b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 87677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the argument type is a pack expansion, look at its pattern. 877dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // This isn't explicitly called out 87877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (const PackExpansionType *ArgExpansion 87977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor = dyn_cast<PackExpansionType>(Arg)) 88077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Arg = ArgExpansion->getPattern(); 881dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 8825c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (PartialOrdering) { 8835c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p5: 884dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Before the partial ordering is done, certain transformations are 885dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // performed on the types used for partial ordering: 886dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If P is a reference type, P is replaced by the type referred to. 8875c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor const ReferenceType *ParamRef = Param->getAs<ReferenceType>(); 8885c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (ParamRef) 8895c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = ParamRef->getPointeeType(); 890dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 8915c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // - If A is a reference type, A is replaced by the type referred to. 8925c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor const ReferenceType *ArgRef = Arg->getAs<ReferenceType>(); 8935c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (ArgRef) 8945c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Arg = ArgRef->getPointeeType(); 895dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 896b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (RefParamComparisons && ParamRef && ArgRef) { 8975c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p6: 898dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If both P and A were reference types (before being replaced with the 899dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // type referred to above), determine which of the two types (if any) is 9005c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // more cv-qualified than the other; otherwise the types are considered 901dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // to be equally cv-qualified for partial ordering purposes. The result 9025c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // of this determination will be used below. 9035c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // 904dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // We save this information for later, using it only when deduction 9055c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // succeeds in both directions. 906b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamPartialOrderingComparison Comparison; 907b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.ParamIsRvalueRef = ParamRef->getAs<RValueReferenceType>(); 908b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.ArgIsRvalueRef = ArgRef->getAs<RValueReferenceType>(); 909b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = NeitherMoreQualified; 910769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor 911769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor Qualifiers ParamQuals = Param.getQualifiers(); 912769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor Qualifiers ArgQuals = Arg.getQualifiers(); 913769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor if (ParamQuals.isStrictSupersetOf(ArgQuals)) 914b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = ParamMoreQualified; 915769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor else if (ArgQuals.isStrictSupersetOf(ParamQuals)) 916b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = ArgMoreQualified; 917b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons->push_back(Comparison); 9185c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } 919dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9205c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p7: 9215c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // Remove any top-level cv-qualifiers: 922dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If P is a cv-qualified type, P is replaced by the cv-unqualified 9235c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // version of P. 9245c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = Param.getUnqualifiedType(); 925dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If A is a cv-qualified type, A is replaced by the cv-unqualified 9265c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // version of A. 9275c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Arg = Arg.getUnqualifiedType(); 9285c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } else { 9295c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.call]p4 bullet 1: 9305c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // - If the original P is a reference type, the deduced A (i.e., the type 9315c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // referred to by the reference) can be more cv-qualified than the 9325c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // transformed A. 9335c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (TDF & TDF_ParamWithReferenceType) { 9345c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Qualifiers Quals; 9355c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor QualType UnqualParam = S.Context.getUnqualifiedArrayType(Param, Quals); 9365c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Quals.setCVRQualifiers(Quals.getCVRQualifiers() & 93762c28c831bbf207cc36e683e7c321fc33bf8928cJohn McCall Arg.getCVRQualifiers()); 9385c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = S.Context.getQualifiedType(UnqualParam, Quals); 9395c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } 940dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 94173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if ((TDF & TDF_TopLevelParameterTypeList) && !Param->isFunctionType()) { 94273b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // C++0x [temp.deduct.type]p10: 94373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // If P and A are function types that originated from deduction when 94473b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // taking the address of a function template (14.8.2.2) or when deducing 94573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // template arguments from a function declaration (14.8.2.6) and Pi and 946dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Ai are parameters of the top-level parameter-type-list of P and A, 947dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // respectively, Pi is adjusted if it is an rvalue reference to a 948dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // cv-unqualified template parameter and Ai is an lvalue reference, in 949dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // which case the type of Pi is changed to be the template parameter 95073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // type (i.e., T&& is changed to simply T). [ Note: As a result, when 95173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // Pi is T&& and Ai is X&, the adjusted Pi will be T, causing T to be 9520099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // deduced as X&. - end note ] 95373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF &= ~TDF_TopLevelParameterTypeList; 954dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 95573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (const RValueReferenceType *ParamRef 95673b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor = Param->getAs<RValueReferenceType>()) { 95773b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (isa<TemplateTypeParmType>(ParamRef->getPointeeType()) && 95873b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor !ParamRef->getPointeeType().getQualifiers()) 95973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (Arg->isLValueReferenceType()) 96073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Param = ParamRef->getPointeeType(); 96173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor } 96273b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor } 963500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor } 964dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 965f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor // If the parameter type is not dependent, there is nothing to deduce. 9661282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor if (!Param->isDependentType()) { 9673cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor if (!(TDF & TDF_SkipNonDependent) && Param != Arg) 9681282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor return Sema::TDK_NonDeducedMismatch; 969dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 970f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Sema::TDK_Success; 9711282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor } 9720b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 973199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // C++ [temp.deduct.type]p9: 9741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // A template type argument T, a template template argument TT or a 9751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // template non-type argument i can be deduced if P and A have one of 976199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // the following forms: 977199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // 978199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T 979199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // cv-list T 9801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateTypeParmType *TemplateTypeParm 981183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Param->getAs<TemplateTypeParmType>()) { 982af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor // Just skip any attempts to deduce from a placeholder type. 983af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor if (Arg->isPlaceholderType()) 984af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor return Sema::TDK_Success; 985af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor 986f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor unsigned Index = TemplateTypeParm->getIndex(); 987f290e0db835a619014538c41ed552696efc0e977Douglas Gregor bool RecanonicalizeArg = false; 9881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9899e9fae4b8af47c15696da4ea3c30102e3a035179Douglas Gregor // If the argument type is an array type, move the qualifiers up to the 9909e9fae4b8af47c15696da4ea3c30102e3a035179Douglas Gregor // top level, so they can be matched with the qualifiers on the parameter. 991f290e0db835a619014538c41ed552696efc0e977Douglas Gregor if (isa<ArrayType>(Arg)) { 9920953e767ff7817f97b3ab20896b229891eeff45bJohn McCall Qualifiers Quals; 993a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth Arg = S.Context.getUnqualifiedArrayType(Arg, Quals); 9940953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (Quals) { 995a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth Arg = S.Context.getQualifiedType(Arg, Quals); 996f290e0db835a619014538c41ed552696efc0e977Douglas Gregor RecanonicalizeArg = true; 997f290e0db835a619014538c41ed552696efc0e977Douglas Gregor } 998f290e0db835a619014538c41ed552696efc0e977Douglas Gregor } 9991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10000b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // The argument type can not be less qualified than the parameter 10010b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // type. 100261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (!(TDF & TDF_IgnoreQualifiers) && 100361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor hasInconsistentOrSupersetQualifiersOf(Param, Arg)) { 1004f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 100557e97786433e70197a089360228d8f0d82e3ad4cJohn McCall Info.FirstArg = TemplateArgument(Param); 1006833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.SecondArg = TemplateArgument(Arg); 100757e97786433e70197a089360228d8f0d82e3ad4cJohn McCall return Sema::TDK_Underqualified; 1008f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 10090b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 10100b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor assert(TemplateTypeParm->getDepth() == 0 && "Can't deduce with depth > 0"); 1011a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth assert(Arg != S.Context.OverloadTy && "Unresolved overloaded function"); 10120953e767ff7817f97b3ab20896b229891eeff45bJohn McCall QualType DeducedType = Arg; 101349f4e1cbd839da27ff4814b4ea6d85a79f786cbdJohn McCall 101461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Remove any qualifiers on the parameter from the deduced type. 101561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // We checked the qualifiers for consistency above. 101661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers DeducedQs = DeducedType.getQualifiers(); 101761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ParamQs = Param.getQualifiers(); 101861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeCVRQualifiers(ParamQs.getCVRQualifiers()); 101961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.hasObjCGCAttr()) 102061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeObjCGCAttr(); 102161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.hasAddressSpace()) 102261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeAddressSpace(); 1023f85e193739c953358c865005855253af4f68a497John McCall if (ParamQs.hasObjCLifetime()) 1024f85e193739c953358c865005855253af4f68a497John McCall DeducedQs.removeObjCLifetime(); 1025e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor 1026e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor // Objective-C ARC: 1027da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor // If template deduction would produce a lifetime qualifier on a type 1028da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor // that is not a lifetime type, template argument deduction fails. 1029da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor if (ParamQs.hasObjCLifetime() && !DeducedType->isObjCLifetimeType() && 1030da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor !DeducedType->isDependentType()) { 1031da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 1032da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor Info.FirstArg = TemplateArgument(Param); 1033da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor Info.SecondArg = TemplateArgument(Arg); 1034da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor return Sema::TDK_Underqualified; 1035da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor } 1036da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor 1037da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor // Objective-C ARC: 1038e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor // If template deduction would produce an argument type with lifetime type 1039e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor // but no lifetime qualifier, the __strong lifetime qualifier is inferred. 1040e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor if (S.getLangOptions().ObjCAutoRefCount && 1041e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor DeducedType->isObjCLifetimeType() && 1042e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor !DeducedQs.hasObjCLifetime()) 1043e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor DeducedQs.setObjCLifetime(Qualifiers::OCL_Strong); 1044e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor 104561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedType = S.Context.getQualifiedType(DeducedType.getUnqualifiedType(), 104661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs); 104761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 1048f290e0db835a619014538c41ed552696efc0e977Douglas Gregor if (RecanonicalizeArg) 1049a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth DeducedType = S.Context.getCanonicalType(DeducedType); 10501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10510d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(DeducedType); 1052dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 10530d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[Index], 10540d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 10550d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 10560d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 10570d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[Index]; 10580d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 1059dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 10600b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 1061dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10620d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[Index] = Result; 1063dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Success; 10640b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 10650b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1066f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor // Set up the template argument deduction information for a failure. 1067833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.FirstArg = TemplateArgument(ParamIn); 1068833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.SecondArg = TemplateArgument(ArgIn); 1069f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 10700bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // If the parameter is an already-substituted template parameter 10710bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // pack, do nothing: we don't know which of its arguments to look 10720bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // at, so we have to wait until all of the parameter packs in this 10730bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // expansion have arguments. 10740bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor if (isa<SubstTemplateTypeParmPackType>(Param)) 10750bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor return Sema::TDK_Success; 10760bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor 1077508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor // Check the cv-qualifiers on the parameter and argument types. 1078508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (!(TDF & TDF_IgnoreQualifiers)) { 1079508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (TDF & TDF_ParamWithReferenceType) { 108061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (hasInconsistentOrSupersetQualifiersOf(Param, Arg)) 1081508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1082cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall } else if (!IsPossiblyOpaquelyQualifiedType(Param)) { 1083508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (Param.getCVRQualifiers() != Arg.getCVRQualifiers()) 10841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Sema::TDK_NonDeducedMismatch; 1085508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor } 1086508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor } 10870b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1088d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor switch (Param->getTypeClass()) { 10894ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Non-canonical types cannot appear here. 10904ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor#define NON_CANONICAL_TYPE(Class, Base) \ 10914ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Class: llvm_unreachable("deducing non-canonical type: " #Class); 10924ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor#define TYPE(Class, Base) 10934ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor#include "clang/AST/TypeNodes.def" 10944ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 10954ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::TemplateTypeParm: 10964ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::SubstTemplateTypeParmPack: 10974ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor llvm_unreachable("Type nodes handled above"); 10984ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 10994ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // These types cannot be used in templates or cannot be dependent, so 11004ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // deduction always fails. 1101199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case Type::Builtin: 11024ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::VariableArray: 11034ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Vector: 11044ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::FunctionNoProto: 11054ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Record: 11064ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Enum: 11074ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ObjCObject: 11084ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ObjCInterface: 11094ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ObjCObjectPointer: 1110f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11124ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // _Complex T [placeholder extension] 11134ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Complex: 11144ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const ComplexType *ComplexArg = Arg->getAs<ComplexType>()) 1115bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 11164ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor cast<ComplexType>(Param)->getElementType(), 1117bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ComplexArg->getElementType(), 1118bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF); 11194ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 11204ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1121b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 1122b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman // _Atomic T [extension] 1123b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman case Type::Atomic: 1124b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman if (const AtomicType *AtomicArg = Arg->getAs<AtomicType>()) 1125bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1126b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman cast<AtomicType>(Param)->getValueType(), 1127b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman AtomicArg->getValueType(), 1128b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman Info, Deduced, TDF); 1129b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 1130b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman return Sema::TDK_NonDeducedMismatch; 1131b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 1132199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T * 1133d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::Pointer: { 1134c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall QualType PointeeType; 1135c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall if (const PointerType *PointerArg = Arg->getAs<PointerType>()) { 1136c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType = PointerArg->getPointeeType(); 1137c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } else if (const ObjCObjectPointerType *PointerArg 1138c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall = Arg->getAs<ObjCObjectPointerType>()) { 1139c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType = PointerArg->getPointeeType(); 1140c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } else { 1141f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1142c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } 11431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11444112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor unsigned SubTDF = TDF & (TDF_IgnoreQualifiers | TDF_DerivedClass); 1145bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1146bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl cast<PointerType>(Param)->getPointeeType(), 1147c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType, 11484112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor Info, Deduced, SubTDF); 1149d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1151199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T & 1152d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::LValueReference: { 11536217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const LValueReferenceType *ReferenceArg = Arg->getAs<LValueReferenceType>(); 1154d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor if (!ReferenceArg) 1155f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1157bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1158d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor cast<LValueReferenceType>(Param)->getPointeeType(), 1159bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ReferenceArg->getPointeeType(), Info, Deduced, 0); 1160d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11610b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1162199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T && [C++0x] 1163d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::RValueReference: { 11646217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const RValueReferenceType *ReferenceArg = Arg->getAs<RValueReferenceType>(); 1165d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor if (!ReferenceArg) 1166f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1168bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1169bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl cast<RValueReferenceType>(Param)->getPointeeType(), 1170bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ReferenceArg->getPointeeType(), 1171bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 0); 1172d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1174199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T [] (implied, but not stated explicitly) 11754d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson case Type::IncompleteArray: { 11761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const IncompleteArrayType *IncompleteArrayArg = 1177a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsIncompleteArrayType(Arg); 11784d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (!IncompleteArrayArg) 1179f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1181e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1182bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1183bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl S.Context.getAsIncompleteArrayType(Param)->getElementType(), 1184bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl IncompleteArrayArg->getElementType(), 1185bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, SubTDF); 11864d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson } 1187199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1188199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T [integer-constant] 11894d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson case Type::ConstantArray: { 11901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const ConstantArrayType *ConstantArrayArg = 1191a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsConstantArrayType(Arg); 11924d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (!ConstantArrayArg) 1193f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const ConstantArrayType *ConstantArrayParm = 1196a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsConstantArrayType(Param); 11974d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (ConstantArrayArg->getSize() != ConstantArrayParm->getSize()) 1198f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1200e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1201bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1202bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ConstantArrayParm->getElementType(), 1203bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ConstantArrayArg->getElementType(), 1204bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, SubTDF); 12054d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson } 12064d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson 1207199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // type [i] 1208199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case Type::DependentSizedArray: { 1209a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth const ArrayType *ArrayArg = S.Context.getAsArrayType(Arg); 1210199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (!ArrayArg) 1211f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 12121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1213e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1214e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall 1215199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Check the element type of the arrays 1216199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor const DependentSizedArrayType *DependentArrayParm 1217a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = S.Context.getAsDependentSizedArrayType(Param); 1218f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1219bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1220bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl DependentArrayParm->getElementType(), 1221bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ArrayArg->getElementType(), 1222bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, SubTDF)) 1223f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 12241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1225199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Determine the array bound is something we can deduce. 12261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NonTypeTemplateParmDecl *NTTP 1227199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = getDeducedParameterFromExpr(DependentArrayParm->getSizeExpr()); 1228199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (!NTTP) 1229f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 12301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // We can perform template argument deduction for the given non-type 1232199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // template parameter. 12331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 1234199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument at depth > 0"); 12351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const ConstantArrayType *ConstantArrayArg 1236335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson = dyn_cast<ConstantArrayType>(ArrayArg)) { 1237335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson llvm::APSInt Size(ConstantArrayArg->getSize()); 1238dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceNonTypeTemplateArgument(S, NTTP, Size, 12399d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor S.Context.getSizeType(), 124002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor /*ArrayBound=*/true, 1241f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 1242335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson } 1243199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (const DependentSizedArrayType *DependentArrayArg 1244199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = dyn_cast<DependentSizedArrayType>(ArrayArg)) 124534c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor if (DependentArrayArg->getSizeExpr()) 124634c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, 124734c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor DependentArrayArg->getSizeExpr(), 124834c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor Info, Deduced); 12491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1250199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Incomplete type does not match a dependently-sized array type 1251f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1252199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 12531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // type(*)(T) 12551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(*)() 12561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(*)(T) 1257a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson case Type::FunctionProto: { 125873b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor unsigned SubTDF = TDF & TDF_TopLevelParameterTypeList; 12591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *FunctionProtoArg = 1260a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson dyn_cast<FunctionProtoType>(Arg); 1261a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson if (!FunctionProtoArg) 1262f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 12631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *FunctionProtoParam = 1265a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson cast<FunctionProtoType>(Param); 1266994b6cb65c9daba2128366bc4c64be6dbf953528Anders Carlsson 1267dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (FunctionProtoParam->getTypeQuals() 1268e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor != FunctionProtoArg->getTypeQuals() || 1269dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionProtoParam->getRefQualifier() 1270e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor != FunctionProtoArg->getRefQualifier() || 1271e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor FunctionProtoParam->isVariadic() != FunctionProtoArg->isVariadic()) 1272f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1273994b6cb65c9daba2128366bc4c64be6dbf953528Anders Carlsson 1274a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson // Check return types. 1275f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1276bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1277bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl FunctionProtoParam->getResultType(), 1278bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl FunctionProtoArg->getResultType(), 1279bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 0)) 1280f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 12811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1282603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return DeduceTemplateArguments(S, TemplateParams, 1283603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoParam->arg_type_begin(), 1284603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoParam->getNumArgs(), 1285603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoArg->arg_type_begin(), 1286603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoArg->getNumArgs(), 128773b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Info, Deduced, SubTDF); 1288a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson } 12891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12903cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall case Type::InjectedClassName: { 12913cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // Treat a template's injected-class-name as if the template 12923cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // specialization type had been used. 129331f17ecbef57b5679c017c375db330546b7b5145John McCall Param = cast<InjectedClassNameType>(Param) 129431f17ecbef57b5679c017c375db330546b7b5145John McCall ->getInjectedSpecializationType(); 12953cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall assert(isa<TemplateSpecializationType>(Param) && 12963cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall "injected class name is not a template specialization type"); 12973cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // fall through 12983cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall } 12993cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall 1300f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor // template-name<T> (where template-name refers to a class template) 1301d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor // template-name<i> 1302db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<T> 1303db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<i> 1304db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<> 1305d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor case Type::TemplateSpecialization: { 1306d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor const TemplateSpecializationType *SpecParam 1307d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor = cast<TemplateSpecializationType>(Param); 13081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1309de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Try to deduce template arguments from the template-id. 1310de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Sema::TemplateDeductionResult Result 1311a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, SpecParam, Arg, 1312de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced); 13131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13144a5c15f75f76b95e1c2ceb6fa2737dcadd5f4be1Douglas Gregor if (Result && (TDF & TDF_DerivedClass)) { 1315de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // C++ [temp.deduct.call]p3b3: 1316de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If P is a class, and P has the form template-id, then A can be a 1317de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // derived class of the deduced A. Likewise, if P is a pointer to a 13181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // class of the form template-id, A can be a pointer to a derived 1319de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // class pointed to by the deduced A. 1320de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // 1321de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // More importantly: 13221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // These alternatives are considered only if type deduction would 1323de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // otherwise fail. 1324a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth if (const RecordType *RecordT = Arg->getAs<RecordType>()) { 1325a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // We cannot inspect base classes as part of deduction when the type 1326a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // is incomplete, so either instantiate any templates necessary to 1327a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // complete the type, or skip over it if it cannot be completed. 13285769d6195087229770d7ac90449443e026c47103John McCall if (S.RequireCompleteType(Info.getLocation(), Arg, 0)) 1329a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return Result; 1330a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth 1331de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Use data recursion to crawl through the list of base classes. 13321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Visited contains the set of nodes we have already visited, while 1333de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // ToVisit is our stack of records that we still need to visit. 1334de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor llvm::SmallPtrSet<const RecordType *, 8> Visited; 13355f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<const RecordType *, 8> ToVisit; 1336de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor ToVisit.push_back(RecordT); 1337de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor bool Successful = false; 133874fe66181db91d45d48f57abe325ea487e32ddbcBenjamin Kramer SmallVector<DeducedTemplateArgument, 8> DeducedOrig(Deduced.begin(), 133974fe66181db91d45d48f57abe325ea487e32ddbcBenjamin Kramer Deduced.end()); 1340de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor while (!ToVisit.empty()) { 1341de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Retrieve the next class in the inheritance hierarchy. 1342de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const RecordType *NextT = ToVisit.back(); 1343de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor ToVisit.pop_back(); 13441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1345de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If we have already seen this type, skip it. 1346de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!Visited.insert(NextT)) 1347de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor continue; 13481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1349de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If this is a base class, try to perform template argument 1350de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // deduction from it. 1351de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (NextT != RecordT) { 1352de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Sema::TemplateDeductionResult BaseResult 1353a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, SpecParam, 1354de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor QualType(NextT, 0), Info, Deduced); 13551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1356de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If template argument deduction for this base was successful, 1357053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor // note that we had some success. Otherwise, ignore any deductions 1358053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor // from this base class. 1359053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor if (BaseResult == Sema::TDK_Success) { 1360de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Successful = true; 136174fe66181db91d45d48f57abe325ea487e32ddbcBenjamin Kramer DeducedOrig.clear(); 136274fe66181db91d45d48f57abe325ea487e32ddbcBenjamin Kramer DeducedOrig.append(Deduced.begin(), Deduced.end()); 1363053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor } 1364053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor else 1365053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor Deduced = DeducedOrig; 1366de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1368de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Visit base classes 1369de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor CXXRecordDecl *Next = cast<CXXRecordDecl>(NextT->getDecl()); 1370de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor for (CXXRecordDecl::base_class_iterator Base = Next->bases_begin(), 1371de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor BaseEnd = Next->bases_end(); 13729994a34f6cf842721ba7723edc0b9036229fe387Sebastian Redl Base != BaseEnd; ++Base) { 13731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(Base->getType()->isRecordType() && 1374de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor "Base class that isn't a record?"); 13756217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek ToVisit.push_back(Base->getType()->getAs<RecordType>()); 1376de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 1377de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1379de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Successful) 1380de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_Success; 1381de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1383de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1385de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 1386d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor } 1387d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 1388637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T type::* 1389637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T T::* 1390637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (type::*)() 1391637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (T::*)() 1392637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (type::*)(T) 1393637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (T::*)(T) 1394637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (type::*)(T) 1395637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (T::*)() 1396637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (T::*)(T) 1397637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::MemberPointer: { 1398637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor const MemberPointerType *MemPtrParam = cast<MemberPointerType>(Param); 1399637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor const MemberPointerType *MemPtrArg = dyn_cast<MemberPointerType>(Arg); 1400637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor if (!MemPtrArg) 1401f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1402f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1403f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1404bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1405bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl MemPtrParam->getPointeeType(), 1406bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl MemPtrArg->getPointeeType(), 1407bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 1408bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl TDF & TDF_IgnoreQualifiers)) 1409f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 1410f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1411bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1412bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl QualType(MemPtrParam->getClass(), 0), 1413bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl QualType(MemPtrArg->getClass(), 0), 1414bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 0); 1415637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor } 1416637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor 14179a917e4fac79aba20fbd25983c78396475078918Anders Carlsson // (clang extension) 14189a917e4fac79aba20fbd25983c78396475078918Anders Carlsson // 14191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // type(^)(T) 14201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(^)() 14211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(^)(T) 1422859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson case Type::BlockPointer: { 1423859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson const BlockPointerType *BlockPtrParam = cast<BlockPointerType>(Param); 1424859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson const BlockPointerType *BlockPtrArg = dyn_cast<BlockPointerType>(Arg); 14251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1426859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson if (!BlockPtrArg) 1427f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 14281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1429bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1430bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl BlockPtrParam->getPointeeType(), 1431bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl BlockPtrArg->getPointeeType(), 1432bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 0); 1433859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson } 1434859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson 14354ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // (clang extension) 14364ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // 14374ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // T __attribute__(((ext_vector_type(<integral constant>)))) 14384ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ExtVector: { 14394ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor const ExtVectorType *VectorParam = cast<ExtVectorType>(Param); 14404ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { 14414ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Make sure that the vectors have the same number of elements. 14424ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (VectorParam->getNumElements() != VectorArg->getNumElements()) 14434ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 14444ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14454ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 1446bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1447bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorParam->getElementType(), 1448bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorArg->getElementType(), 1449bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF); 14504ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14514ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14524ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const DependentSizedExtVectorType *VectorArg 14534ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = dyn_cast<DependentSizedExtVectorType>(Arg)) { 14544ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // We can't check the number of elements, since the argument has a 14554ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // dependent number of elements. This can only occur during partial 14564ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // ordering. 14574ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14584ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 1459bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1460bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorParam->getElementType(), 1461bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorArg->getElementType(), 1462bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF); 14634ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14644ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14654ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 14664ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14674ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14684ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // (clang extension) 14694ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // 14704ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // T __attribute__(((ext_vector_type(N)))) 14714ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::DependentSizedExtVector: { 14724ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor const DependentSizedExtVectorType *VectorParam 14734ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = cast<DependentSizedExtVectorType>(Param); 14744ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14754ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { 14764ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 14774ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (Sema::TemplateDeductionResult Result 1478bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1479bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorParam->getElementType(), 1480bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorArg->getElementType(), 1481bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF)) 14824ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Result; 14834ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14844ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the vector size, if we can. 14854ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor NonTypeTemplateParmDecl *NTTP 14864ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = getDeducedParameterFromExpr(VectorParam->getSizeExpr()); 14874ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (!NTTP) 14884ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_Success; 14894ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14904ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor llvm::APSInt ArgSize(S.Context.getTypeSize(S.Context.IntTy), false); 14914ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor ArgSize = VectorArg->getNumElements(); 14924ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, ArgSize, S.Context.IntTy, 14934ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor false, Info, Deduced); 14944ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14954ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14964ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const DependentSizedExtVectorType *VectorArg 14974ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = dyn_cast<DependentSizedExtVectorType>(Arg)) { 14984ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 14994ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (Sema::TemplateDeductionResult Result 1500bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1501bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorParam->getElementType(), 1502bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl VectorArg->getElementType(), 1503bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF)) 15044ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Result; 15054ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15064ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the vector size, if we can. 15074ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor NonTypeTemplateParmDecl *NTTP 15084ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = getDeducedParameterFromExpr(VectorParam->getSizeExpr()); 15094ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (!NTTP) 15104ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_Success; 15114ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15124ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, VectorArg->getSizeExpr(), 15134ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor Info, Deduced); 15144ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 15154ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15164ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 15174ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 15184ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 1519637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::TypeOfExpr: 1520637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::TypeOf: 15214714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor case Type::DependentName: 15224ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::UnresolvedUsing: 15234ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Decltype: 15244ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::UnaryTransform: 15254ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Auto: 15264ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::DependentTemplateSpecialization: 15274ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::PackExpansion: 1528637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // No template argument deduction for these types 1529f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 15300b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 15310b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1532f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Sema::TDK_Success; 15330b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 15340b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1535f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 1536a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 1537f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 1538f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor const TemplateArgument &Param, 153977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor TemplateArgument Arg, 15402a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 15415f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 154277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the template argument is a pack expansion, perform template argument 154377d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // deduction against the pattern of that expansion. This only occurs during 154477d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // partial ordering. 154577d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (Arg.isPackExpansion()) 154677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Arg = Arg.getPackExpansionPattern(); 1547dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 15480b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor switch (Param.getKind()) { 1549199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Null: 1550b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Null template argument in parameter list"); 15511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case TemplateArgument::Type: 1553788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (Arg.getKind() == TemplateArgument::Type) 1554bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl return DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 1555bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Param.getAsType(), 1556bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Arg.getAsType(), 1557bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, 0); 1558788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.FirstArg = Param; 1559788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.SecondArg = Arg; 1560788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1561a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 1562788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 1563db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (Arg.getKind() == TemplateArgument::Template) 1564dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 1565788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Param.getAsTemplate(), 1566db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Arg.getAsTemplate(), Info, Deduced); 1567788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.FirstArg = Param; 1568788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.SecondArg = Arg; 1569788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1570a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 1571a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 1572a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor llvm_unreachable("caller should handle pack expansions"); 1573a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor break; 1574dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1575199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Declaration: 1576788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (Arg.getKind() == TemplateArgument::Declaration && 1577788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Param.getAsDecl()->getCanonicalDecl() == 1578788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Arg.getAsDecl()->getCanonicalDecl()) 1579788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_Success; 1580dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1581f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1582f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1583f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 15841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1585199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Integral: 1586199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Integral) { 15879d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if (hasSameExtendedValue(*Param.getAsIntegral(), *Arg.getAsIntegral())) 1588f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 1589f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1590f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1591f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1592f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1593f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 1594f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1595f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Arg.getKind() == TemplateArgument::Expression) { 1596f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1597f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1598f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1599199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 1600199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1601f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1602f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1603f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 16041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1605199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Expression: { 16061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (NonTypeTemplateParmDecl *NTTP 1607199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = getDeducedParameterFromExpr(Param.getAsExpr())) { 1608199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Integral) 1609a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, 16101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump *Arg.getAsIntegral(), 16119d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor Arg.getIntegralType(), 161202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor /*ArrayBound=*/false, 1613f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 1614199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Expression) 1615a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsExpr(), 1616f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 161715755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor if (Arg.getKind() == TemplateArgument::Declaration) 1618a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsDecl(), 161915755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor Info, Deduced); 1620dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1621f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1622f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1623f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1624199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 16251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1626199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Can't deduce anything, but that's okay. 1627f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 1628199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 1629d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson case TemplateArgument::Pack: 163020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor llvm_unreachable("Argument packs should be expanded by the caller!"); 16310b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 16321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1633f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 16340b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 16350b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 163620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \brief Determine whether there is a template argument to be used for 163720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// deduction. 163820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// 163920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// This routine "expands" argument packs in-place, overriding its input 164020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// parameters so that \c Args[ArgIdx] will be the available template argument. 164120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// 164220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \returns true if there is another template argument (which will be at 164320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \c Args[ArgIdx]), false otherwise. 1644dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic bool hasTemplateArgumentForDeduction(const TemplateArgument *&Args, 164520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned &ArgIdx, 164620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned &NumArgs) { 164720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (ArgIdx == NumArgs) 164820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return false; 1649dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 165020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument &Arg = Args[ArgIdx]; 165120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (Arg.getKind() != TemplateArgument::Pack) 165220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return true; 165320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 165420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor assert(ArgIdx == NumArgs - 1 && "Pack not at the end of argument list?"); 165520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Args = Arg.pack_begin(); 165620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor NumArgs = Arg.pack_size(); 165720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ArgIdx = 0; 165820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return ArgIdx < NumArgs; 165920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor} 166020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 16617b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor/// \brief Determine whether the given set of template arguments has a pack 16627b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor/// expansion that is not the last template argument. 16637b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregorstatic bool hasPackExpansionBeforeEnd(const TemplateArgument *Args, 16647b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor unsigned NumArgs) { 16657b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor unsigned ArgIdx = 0; 16667b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor while (ArgIdx < NumArgs) { 16677b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor const TemplateArgument &Arg = Args[ArgIdx]; 1668dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16697b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // Unwrap argument packs. 16707b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (Args[ArgIdx].getKind() == TemplateArgument::Pack) { 16717b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor Args = Arg.pack_begin(); 16727b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor NumArgs = Arg.pack_size(); 16737b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor ArgIdx = 0; 16747b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor continue; 16757b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor } 1676dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16777b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor ++ArgIdx; 16787b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (ArgIdx == NumArgs) 16797b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return false; 1680dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16817b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (Arg.isPackExpansion()) 16827b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return true; 16837b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor } 1684dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16857b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return false; 16867b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor} 16877b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 16881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic Sema::TemplateDeductionResult 1689a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 1690f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 169120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Params, unsigned NumParams, 169220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Args, unsigned NumArgs, 16932a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 16945f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 16950972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor bool NumberOfArgumentsMustMatch) { 1696e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1697dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 1698dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 1699e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // non-deduced context. 17007b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (hasPackExpansionBeforeEnd(Params, NumParams)) 17017b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return Sema::TDK_Success; 1702dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1703e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1704dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If P has a form that contains <T> or <i>, then each argument Pi of the 1705dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // respective template argument list P is compared with the corresponding 1706e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // argument Ai of the corresponding template argument list of A. 170720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned ArgIdx = 0, ParamIdx = 0; 1708dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (; hasTemplateArgumentForDeduction(Params, ParamIdx, NumParams); 170920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ++ParamIdx) { 171020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (!Params[ParamIdx].isPackExpansion()) { 1711e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The simple case: deduce template arguments by matching Pi and Ai. 1712dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 171320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Check whether we have enough arguments. 171420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (!hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) 17153cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return NumberOfArgumentsMustMatch? Sema::TDK_NonDeducedMismatch 17160972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor : Sema::TDK_Success; 1717dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 171877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (Args[ArgIdx].isPackExpansion()) { 171977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // FIXME: We follow the logic of C++0x [temp.deduct.type]p22 here, 172077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // but applied to pack expansions that are template arguments. 172177d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor return Sema::TDK_NonDeducedMismatch; 172277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor } 1723dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1724e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Perform deduction for this Pi/Ai pair. 172520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (Sema::TemplateDeductionResult Result 172677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor = DeduceTemplateArguments(S, TemplateParams, 172777d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Params[ParamIdx], Args[ArgIdx], 172877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Info, Deduced)) 1729dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 1730dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 173120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Move to the next argument. 173220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ++ArgIdx; 173320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor continue; 173420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor } 1735dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1736e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The parameter is a pack expansion. 1737dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1738e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1739dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If Pi is a pack expansion, then the pattern of Pi is compared with 1740dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // each remaining argument in the template argument list of A. Each 1741dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // comparison deduces template arguments for subsequent positions in the 1742e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // template parameter packs expanded by Pi. 1743e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor TemplateArgument Pattern = Params[ParamIdx].getPackExpansionPattern(); 1744dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1745e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Compute the set of template parameter indices that correspond to 1746e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // parameter packs expanded by the pack expansion. 17475f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<unsigned, 2> PackIndices; 1748e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor { 1749e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor llvm::BitVector SawIndices(TemplateParams->size()); 17505f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UnexpandedParameterPack, 2> Unexpanded; 1751e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor S.collectUnexpandedParameterPacks(Pattern, Unexpanded); 1752e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 1753e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor unsigned Depth, Index; 1754e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 1755e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 1756e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor SawIndices[Index] = true; 1757e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor PackIndices.push_back(Index); 1758e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1759e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1760e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1761e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 1762dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1763e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // FIXME: If there are no remaining arguments, we can bail out early 1764e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // and set any deduced parameter packs to an empty argument pack. 1765e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The latter part of this is a (minor) correctness issue. 1766dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1767e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Save the deduced template arguments for each parameter pack expanded 1768e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // by this pack expansion, then clear out the deduction. 17695f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 2> 1770e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor SavedPacks(PackIndices.size()); 17715f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> 17725429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 1773dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, 17745429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks); 1775e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor 1776e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Keep track of the deduced template arguments for each parameter pack 1777dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 1778e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // template argument (the inner SmallVectors). 1779e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor bool HasAnyArguments = false; 1780e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor while (hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) { 1781e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor HasAnyArguments = true; 1782dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1783e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Deduce template arguments from the pattern. 1784dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (Sema::TemplateDeductionResult Result 1785e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, Pattern, Args[ArgIdx], 1786e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info, Deduced)) 1787e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor return Result; 1788dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1789e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 1790e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 1791e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // for that pack, then clear out the deduced argument. 1792e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 1793e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 1794e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (!DeducedArg.isNull()) { 1795e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 1796e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor DeducedArg = DeducedTemplateArgument(); 1797e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1798e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1799dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1800e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor ++ArgIdx; 1801e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1802dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1803e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 1804e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // pack expansion. 18050216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 1806dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(S, TemplateParams, HasAnyArguments, 18070216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 18080216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 1809dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 18100b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 1811dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 181220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // If there is an argument remaining, then we had too many arguments. 18130972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor if (NumberOfArgumentsMustMatch && 18140972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) 18153cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1816dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1817f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 18180b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 18190b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 182020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregorstatic Sema::TemplateDeductionResult 182120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas GregorDeduceTemplateArguments(Sema &S, 182220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateParameterList *TemplateParams, 182320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgumentList &ParamList, 182420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgumentList &ArgList, 182520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateDeductionInfo &Info, 18265f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 1827dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 182820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ParamList.data(), ParamList.size(), 182920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ArgList.data(), ArgList.size(), 183020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Info, Deduced); 183120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor} 183220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 1833f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor/// \brief Determine whether two template arguments are the same. 18341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic bool isSameTemplateArg(ASTContext &Context, 1835f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor const TemplateArgument &X, 1836f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor const TemplateArgument &Y) { 1837f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (X.getKind() != Y.getKind()) 1838f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 18391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1840f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor switch (X.getKind()) { 1841f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Null: 1842b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Comparing NULL template argument"); 18431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1844f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Type: 1845f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Context.getCanonicalType(X.getAsType()) == 1846f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Context.getCanonicalType(Y.getAsType()); 18471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1848f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Declaration: 184997fbaa2a38804268a024f1a104b43fcf8b4411b0Argyrios Kyrtzidis return X.getAsDecl()->getCanonicalDecl() == 185097fbaa2a38804268a024f1a104b43fcf8b4411b0Argyrios Kyrtzidis Y.getAsDecl()->getCanonicalDecl(); 18511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1852788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 1853a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 1854a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor return Context.getCanonicalTemplateName( 1855a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor X.getAsTemplateOrTemplatePattern()).getAsVoidPointer() == 1856a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Context.getCanonicalTemplateName( 1857a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Y.getAsTemplateOrTemplatePattern()).getAsVoidPointer(); 1858dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1859f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Integral: 1860f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return *X.getAsIntegral() == *Y.getAsIntegral(); 18611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1862788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Expression: { 1863788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor llvm::FoldingSetNodeID XID, YID; 1864788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor X.getAsExpr()->Profile(XID, Context, true); 1865dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Y.getAsExpr()->Profile(YID, Context, true); 1866788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return XID == YID; 1867788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor } 18681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1869f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Pack: 1870f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (X.pack_size() != Y.pack_size()) 1871f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 18721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 18731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (TemplateArgument::pack_iterator XP = X.pack_begin(), 18741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump XPEnd = X.pack_end(), 1875f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor YP = Y.pack_begin(); 18761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump XP != XPEnd; ++XP, ++YP) 1877f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (!isSameTemplateArg(Context, *XP, *YP)) 1878f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 1879f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 1880f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return true; 1881f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor } 1882f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 1883f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 1884f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor} 1885f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 188654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \brief Allocate a TemplateArgumentLoc where all locations have 188754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// been initialized to the given location. 188854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 188954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param S The semantic analysis object. 189054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 189154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param The template argument we are producing template argument 189254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// location information for. 189354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 189454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param NTTPType For a declaration template argument, the type of 189554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// the non-type template parameter that corresponds to this template 189654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// argument. 189754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 189854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param Loc The source location to use for the resulting template 189954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// argument. 1900dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic TemplateArgumentLoc 190154c53cca105ed595e12fecf04e415c3712bda936Douglas GregorgetTrivialTemplateArgumentLoc(Sema &S, 1902dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const TemplateArgument &Arg, 190354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor QualType NTTPType, 190454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor SourceLocation Loc) { 190554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor switch (Arg.getKind()) { 190654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Null: 190754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor llvm_unreachable("Can't get a NULL template argument here"); 190854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor break; 1909dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 191054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Type: 1911dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return TemplateArgumentLoc(Arg, 191254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor S.Context.getTrivialTypeSourceInfo(Arg.getAsType(), Loc)); 1913dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 191454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Declaration: { 191554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Expr *E 1916ba68eca7582a62e3e2ff4b0eba1b2b73a6b80895Douglas Gregor = S.BuildExpressionFromDeclTemplateArgument(Arg, NTTPType, Loc) 191754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor .takeAs<Expr>(); 191854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(TemplateArgument(E), E); 191954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1920dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 192154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Integral: { 192254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Expr *E 1923ba68eca7582a62e3e2ff4b0eba1b2b73a6b80895Douglas Gregor = S.BuildExpressionFromIntegralTemplateArgument(Arg, Loc).takeAs<Expr>(); 192454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(TemplateArgument(E), E); 192554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1926dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1927b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor case TemplateArgument::Template: 1928b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor case TemplateArgument::TemplateExpansion: { 1929b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor NestedNameSpecifierLocBuilder Builder; 1930b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor TemplateName Template = Arg.getAsTemplate(); 1931b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) 1932b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.MakeTrivial(S.Context, DTN->getQualifier(), Loc); 1933b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor else if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName()) 1934b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.MakeTrivial(S.Context, QTN->getQualifier(), Loc); 1935b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1936b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor if (Arg.getKind() == TemplateArgument::Template) 1937b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor return TemplateArgumentLoc(Arg, 1938b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.getWithLocInContext(S.Context), 1939b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Loc); 1940b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1941b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1942b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor return TemplateArgumentLoc(Arg, Builder.getWithLocInContext(S.Context), 1943b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Loc, Loc); 1944b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor } 1945a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 194654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Expression: 194754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(Arg, Arg.getAsExpr()); 1948dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 194954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Pack: 195054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(Arg, TemplateArgumentLocInfo()); 195154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1952dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 195354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(); 195454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor} 195554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 195654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 195754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \brief Convert the given deduced template argument and add it to the set of 195854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// fully-converted template arguments. 1959dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic bool ConvertDeducedTemplateArgument(Sema &S, NamedDecl *Param, 196054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor DeducedTemplateArgument Arg, 1961dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NamedDecl *Template, 1962dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi QualType NTTPType, 19636952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor unsigned ArgumentPackIndex, 196454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateDeductionInfo &Info, 196554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor bool InFunctionTemplate, 19665f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<TemplateArgument> &Output) { 196754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor if (Arg.getKind() == TemplateArgument::Pack) { 196854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // This is a template argument pack, so check each of its arguments against 196954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // the template parameter. 19705f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 2> PackedArgsBuilder; 1971dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (TemplateArgument::pack_iterator PA = Arg.pack_begin(), 1972135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor PAEnd = Arg.pack_end(); 197354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor PA != PAEnd; ++PA) { 1974d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // When converting the deduced template argument, append it to the 1975d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // general output list. We need to do this so that the template argument 1976d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // checking logic has all of the prior template arguments available. 197754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor DeducedTemplateArgument InnerArg(*PA); 197854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InnerArg.setDeducedFromArrayBound(Arg.wasDeducedFromArrayBound()); 1979dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (ConvertDeducedTemplateArgument(S, Param, InnerArg, Template, 19806952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor NTTPType, PackedArgsBuilder.size(), 19816952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor Info, InFunctionTemplate, Output)) 198254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return true; 1983dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1984d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // Move the converted template argument into our argument pack. 1985d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor PackedArgsBuilder.push_back(Output.back()); 1986d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Output.pop_back(); 198754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1988dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 198954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Create the resulting argument pack. 1990dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Output.push_back(TemplateArgument::CreatePackCopy(S.Context, 1991203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor PackedArgsBuilder.data(), 1992203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor PackedArgsBuilder.size())); 199354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return false; 199454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1995dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 199654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Convert the deduced template argument into a template 199754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // argument that we can check, almost as if the user had written 199854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // the template argument explicitly. 199954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateArgumentLoc ArgLoc = getTrivialTemplateArgumentLoc(S, Arg, NTTPType, 200054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.getLocation()); 2001dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 200254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Check the template argument, converting it as necessary. 200354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return S.CheckTemplateArgument(Param, ArgLoc, 200454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template, 200554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template->getLocation(), 200654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template->getSourceRange().getEnd(), 20076952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor ArgumentPackIndex, 200854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Output, 200954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InFunctionTemplate 201054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor ? (Arg.wasDeducedFromArrayBound() 2011dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ? Sema::CTAK_DeducedFromArrayBound 201254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor : Sema::CTAK_Deduced) 201354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor : Sema::CTAK_Specified); 201454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor} 201554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 201631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// Complete template argument deduction for a class template partial 201731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// specialization. 201831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregorstatic Sema::TemplateDeductionResult 2019dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiFinishTemplateArgumentDeduction(Sema &S, 202031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor ClassTemplatePartialSpecializationDecl *Partial, 202131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor const TemplateArgumentList &TemplateArgs, 20225f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 20232a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info) { 202431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // Trap errors. 202531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Sema::SFINAETrap Trap(S); 2026dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 202731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Sema::ContextRAII SavedContext(S, Partial); 2028f5813826802c2e76cdc13cae834ebfd4518d74a6John McCall 202902cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // C++ [temp.deduct.type]p2: 203002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // [...] or if any template argument remains neither deduced nor 203102cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // explicitly specified, template argument deduction fails. 20325f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> Builder; 2033033a3cad525e5b221ba035ffc3e0abfa1241d90eDouglas Gregor TemplateParameterList *PartialParams = Partial->getTemplateParameters(); 2034033a3cad525e5b221ba035ffc3e0abfa1241d90eDouglas Gregor for (unsigned I = 0, N = PartialParams->size(); I != N; ++I) { 203554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor NamedDecl *Param = PartialParams->getParam(I); 2036f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Deduced[I].isNull()) { 203754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.Param = makeTemplateParameter(Param); 203831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_Incomplete; 2039f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 2040dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 204154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // We have deduced this argument, so it still needs to be 204254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // checked and converted. 2043dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 204454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // First, for a non-type template parameter type that is 204554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // initialized by a declaration, we need the type of the 204654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // corresponding non-type template parameter. 204754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor QualType NTTPType; 2048dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NonTypeTemplateParmDecl *NTTP 2049d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor = dyn_cast<NonTypeTemplateParmDecl>(Param)) { 205054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor NTTPType = NTTP->getType(); 2051d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor if (NTTPType->isDependentType()) { 2052dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, 2053d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Builder.data(), Builder.size()); 2054d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTPType = S.SubstType(NTTPType, 2055d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor MultiLevelTemplateArgumentList(TemplateArgs), 2056d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTP->getLocation(), 2057d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTP->getDeclName()); 2058d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor if (NTTPType.isNull()) { 2059d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Info.Param = makeTemplateParameter(Param); 2060d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // FIXME: These template arguments are temporary. Free them! 2061dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(S.Context, 2062dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.data(), 2063d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Builder.size())); 2064d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor return Sema::TDK_SubstitutionFailure; 2065d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 2066d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 2067d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 2068d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor 206954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor if (ConvertDeducedTemplateArgument(S, Param, Deduced[I], 20706952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor Partial, NTTPType, 0, Info, false, 207154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Builder)) { 207254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.Param = makeTemplateParameter(Param); 207354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2074dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder.data(), 2075dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.size())); 207654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return Sema::TDK_SubstitutionFailure; 207754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 207802cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor } 2079dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 208002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // Form the template argument list from the deduced template arguments. 20811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *DeducedArgumentList 2082dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = TemplateArgumentList::CreateCopy(S.Context, Builder.data(), 2083910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.size()); 2084910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor 2085f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.reset(DeducedArgumentList); 208602cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor 208702cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // Substitute the deduced template arguments into the template 208802cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // arguments of the class template partial specialization, and 208902cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // verify that the instantiated template arguments are both valid 209002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // and are equivalent to the template arguments originally provided 20911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to the class template. 20922a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(S); 209302cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor ClassTemplateDecl *ClassTemplate = Partial->getSpecializedTemplate(); 2094833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall const TemplateArgumentLoc *PartialTemplateArgs 2095833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall = Partial->getTemplateArgsAsWritten(); 2096d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall 2097d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall // Note that we don't provide the langle and rangle locations. 2098d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall TemplateArgumentListInfo InstArgs; 2099d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall 2100e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (S.Subst(PartialTemplateArgs, 2101e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Partial->getNumTemplateArgsAsWritten(), 2102e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor InstArgs, MultiLevelTemplateArgumentList(*DeducedArgumentList))) { 2103e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor unsigned ArgIdx = InstArgs.size(), ParamIdx = ArgIdx; 2104e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (ParamIdx >= Partial->getTemplateParameters()->size()) 2105e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor ParamIdx = Partial->getTemplateParameters()->size() - 1; 2106e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor 2107e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Decl *Param 2108e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor = const_cast<NamedDecl *>( 2109e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Partial->getTemplateParameters()->getParam(ParamIdx)); 2110e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2111e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info.FirstArg = PartialTemplateArgs[ArgIdx].getArgument(); 2112e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor return Sema::TDK_SubstitutionFailure; 2113833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall } 2114833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall 21155f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> ConvertedInstArgs; 211631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (S.CheckTemplateArgumentList(ClassTemplate, Partial->getLocation(), 211754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InstArgs, false, ConvertedInstArgs)) 211831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2119dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 212054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateParameterList *TemplateParams 212154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor = ClassTemplate->getTemplateParameters(); 212254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor for (unsigned I = 0, E = TemplateParams->size(); I != E; ++I) { 2123910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor TemplateArgument InstArg = ConvertedInstArgs.data()[I]; 212431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (!isSameTemplateArg(S.Context, TemplateArgs[I], InstArg)) { 21252fdc5e8199e1e239620f2faae88997153703e16fDouglas Gregor Info.Param = makeTemplateParameter(TemplateParams->getParam(I)); 2126f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Info.FirstArg = TemplateArgs[I]; 2127f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Info.SecondArg = InstArg; 212831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 2129f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor } 213002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor } 213102cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor 2132bb2604122f4186b6f666481f699b27c7e7a95790Douglas Gregor if (Trap.hasErrorOccurred()) 213331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2134bb2604122f4186b6f666481f699b27c7e7a95790Douglas Gregor 213531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_Success; 213631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor} 213731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 213831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// \brief Perform template argument deduction to determine whether 213931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// the given template arguments match the given class template 214031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// partial specialization per C++ [temp.class.spec.match]. 214131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas GregorSema::TemplateDeductionResult 214231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas GregorSema::DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial, 214331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor const TemplateArgumentList &TemplateArgs, 214431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor TemplateDeductionInfo &Info) { 214531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // C++ [temp.class.spec.match]p2: 214631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // A partial specialization matches a given actual template 214731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // argument list if the template arguments of the partial 214831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // specialization can be deduced from the actual template argument 214931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // list (14.8.2). 215031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor SFINAETrap Trap(*this); 21515f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 215231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Deduced.resize(Partial->getTemplateParameters()->size()); 215331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (TemplateDeductionResult Result 215431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor = ::DeduceTemplateArguments(*this, 215531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Partial->getTemplateParameters(), 215631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Partial->getTemplateArgs(), 215731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor TemplateArgs, Info, Deduced)) 215831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Result; 215931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 216031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor InstantiatingTemplate Inst(*this, Partial->getLocation(), Partial, 21619b623639378d53a675921ddfa7316034d571881eDouglas Gregor Deduced.data(), Deduced.size(), Info); 216231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (Inst) 216331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return TDK_InstantiationDepth; 216431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 216531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (Trap.hasErrorOccurred()) 216631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2167dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2168dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return ::FinishTemplateArgumentDeduction(*this, Partial, TemplateArgs, 216931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Deduced, Info); 21700b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 2171031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 21724112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor/// \brief Determine whether the given type T is a simple-template-id type. 21734112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregorstatic bool isSimpleTemplateIdType(QualType T) { 21741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateSpecializationType *Spec 2175183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = T->getAs<TemplateSpecializationType>()) 21764112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor return Spec->getTemplateName().getAsTemplateDecl() != 0; 21771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 21784112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor return false; 21794112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor} 218083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 218183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \brief Substitute the explicitly-provided template arguments into the 218283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// given function template according to C++ [temp.arg.explicit]. 218383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 218483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionTemplate the function template into which the explicit 218583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template arguments will be substituted. 218683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 21871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param ExplicitTemplateArguments the explicitly-specified template 218883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// arguments. 218983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 21901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param Deduced the deduced template arguments, which will be populated 219183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// with the converted and checked explicit template arguments. 219283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 21931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param ParamTypes will be populated with the instantiated function 219483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// parameters. 219583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 219683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionType if non-NULL, the result type of the function template 219783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// will also be instantiated and the pointed-to value will be updated with 219883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// the instantiated function type. 219983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 220083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Info if substitution fails for any reason, this object will be 220183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// populated with more information about the failure. 220283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 220383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \returns TDK_Success if substitution was successful, or some failure 220483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// condition. 220583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::TemplateDeductionResult 220683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::SubstituteExplicitTemplateArguments( 220783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionTemplateDecl *FunctionTemplate, 220867714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo &ExplicitTemplateArgs, 22095f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 22105f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<QualType> &ParamTypes, 221183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType *FunctionType, 221283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionInfo &Info) { 221383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 221483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 221583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 221683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 2217d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs.size() == 0) { 221883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // No arguments to substitute; just copy over the parameter types and 221983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // fill in the function type. 222083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor for (FunctionDecl::param_iterator P = Function->param_begin(), 222183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor PEnd = Function->param_end(); 222283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor P != PEnd; 222383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ++P) 222483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes.push_back((*P)->getType()); 22251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 222683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType) 222783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor *FunctionType = Function->getType(); 222883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Success; 222983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 22301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 223183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Substitution of the explicit template arguments into a function template 223283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor /// is a SFINAE context. Trap any errors that might occur. 22331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 22341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 223583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.arg.explicit]p3: 22361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Template arguments that are present shall be specified in the 22371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // declaration order of their corresponding template-parameters. The 223883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template argument list shall not specify more template-arguments than 22391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // there are corresponding template-parameters. 22405f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> Builder; 22411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 22421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Enter a new template instantiation context where we check the 224383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly-specified template arguments against this function template, 224483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // and then substitute them into the function parameter types. 22451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), 224683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionTemplate, Deduced.data(), Deduced.size(), 22479b623639378d53a675921ddfa7316034d571881eDouglas Gregor ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution, 22489b623639378d53a675921ddfa7316034d571881eDouglas Gregor Info); 224983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (Inst) 225083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_InstantiationDepth; 22511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 225283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (CheckTemplateArgumentList(FunctionTemplate, 225383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor SourceLocation(), 2254d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall ExplicitTemplateArgs, 225583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor true, 2256f1a8445036a2d047c7165d4170e3058cdeaba6ebDouglas Gregor Builder) || Trap.hasErrorOccurred()) { 2257910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor unsigned Index = Builder.size(); 2258fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor if (Index >= TemplateParams->size()) 2259fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor Index = TemplateParams->size() - 1; 2260fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor Info.Param = makeTemplateParameter(TemplateParams->getParam(Index)); 226183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_InvalidExplicitArguments; 2262f1a8445036a2d047c7165d4170e3058cdeaba6ebDouglas Gregor } 22631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 226483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Form the template argument list from the explicitly-specified 226583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template arguments. 22661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *ExplicitArgumentList 2267910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); 226883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.reset(ExplicitArgumentList); 2269dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2270df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // Template argument deduction and the final substitution should be 2271df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // done in the context of the templated declaration. Explicit 2272df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // argument substitution, on the other hand, needs to happen in the 2273df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // calling context. 2274df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); 2275df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall 2276dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we deduced template arguments for a template parameter pack, 2277d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // note that the template argument pack is partially substituted and record 2278d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // the explicit template arguments. They'll be used as part of deduction 2279d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // for this template parameter pack. 2280d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor for (unsigned I = 0, N = Builder.size(); I != N; ++I) { 2281d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument &Arg = Builder[I]; 2282d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (Arg.getKind() == TemplateArgument::Pack) { 2283d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor CurrentInstantiationScope->SetPartiallySubstitutedPack( 2284dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateParams->getParam(I), 2285d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Arg.pack_begin(), 2286d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Arg.pack_size()); 2287d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor break; 2288d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 2289d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 2290d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor 229183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Instantiate the types of each of the function parameters given the 229283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly-specified template arguments. 2293dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (SubstParmTypes(Function->getLocation(), 2294a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor Function->param_begin(), Function->getNumParams(), 2295a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor MultiLevelTemplateArgumentList(*ExplicitArgumentList), 2296a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor ParamTypes)) 2297a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor return TDK_SubstitutionFailure; 229883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 229983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // If the caller wants a full function type back, instantiate the return 230083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // type and form that function type. 230183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType) { 230283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // FIXME: exception-specifications? 23031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *Proto 2304183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Function->getType()->getAs<FunctionProtoType>(); 230583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor assert(Proto && "Function template does not have a prototype?"); 23061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 23071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump QualType ResultType 2308357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor = SubstType(Proto->getResultType(), 2309357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor MultiLevelTemplateArgumentList(*ExplicitArgumentList), 2310357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor Function->getTypeSpecStartLoc(), 2311357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor Function->getDeclName()); 231283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (ResultType.isNull() || Trap.hasErrorOccurred()) 231383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 23141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 23151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump *FunctionType = BuildFunctionType(ResultType, 231683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes.data(), ParamTypes.size(), 231783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Proto->isVariadic(), 231883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Proto->getTypeQuals(), 2319c938c1668b4fd12af154e965dd935a89e4801a70Douglas Gregor Proto->getRefQualifier(), 232083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Function->getLocation(), 2321fa869547eb1cab12d7e0c0dfa8ba594e336b9b32Eli Friedman Function->getDeclName(), 2322fa869547eb1cab12d7e0c0dfa8ba594e336b9b32Eli Friedman Proto->getExtInfo()); 232383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType->isNull() || Trap.hasErrorOccurred()) 232483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 232583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 23261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 232783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.arg.explicit]p2: 23281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Trailing template arguments that can be deduced (14.8.2) may be 23291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // omitted from the list of explicit template-arguments. If all of the 233083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template arguments can be deduced, they may all be omitted; in this 233183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // case, the empty template argument list <> itself may also be omitted. 233283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // 2333d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Take all of the explicitly-specified arguments and put them into 2334d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // the set of deduced template arguments. Explicitly-specified 2335d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // parameter packs, however, will be set to NULL since the deduction 2336d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // mechanisms handle explicitly-specified argument packs directly. 233783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Deduced.reserve(TemplateParams->size()); 2338d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor for (unsigned I = 0, N = ExplicitArgumentList->size(); I != N; ++I) { 2339d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument &Arg = ExplicitArgumentList->get(I); 2340d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (Arg.getKind() == TemplateArgument::Pack) 2341d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Deduced.push_back(DeducedTemplateArgument()); 2342d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor else 2343d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Deduced.push_back(Arg); 2344d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 23451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 234683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Success; 234783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 234883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 2349b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor/// \brief Check whether the deduced argument type for a call to a function 2350b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor/// template matches the actual argument type per C++ [temp.deduct.call]p4. 2351b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregorstatic bool 2352b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas GregorCheckOriginalCallArgDeduction(Sema &S, Sema::OriginalCallArg OriginalArg, 2353b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor QualType DeducedA) { 2354b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor ASTContext &Context = S.Context; 2355b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2356b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor QualType A = OriginalArg.OriginalArgType; 2357b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor QualType OriginalParamType = OriginalArg.OriginalParamType; 2358b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2359b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Check for type equality (top-level cv-qualifiers are ignored). 2360b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (Context.hasSameUnqualifiedType(A, DeducedA)) 2361b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2362b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2363b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Strip off references on the argument types; they aren't needed for 2364b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // the following checks. 2365b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const ReferenceType *DeducedARef = DeducedA->getAs<ReferenceType>()) 2366b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor DeducedA = DeducedARef->getPointeeType(); 2367b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const ReferenceType *ARef = A->getAs<ReferenceType>()) 2368b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor A = ARef->getPointeeType(); 2369b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2370b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // C++ [temp.deduct.call]p4: 2371b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // [...] However, there are three cases that allow a difference: 2372b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // - If the original P is a reference type, the deduced A (i.e., the 2373b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // type referred to by the reference) can be more cv-qualified than 2374b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // the transformed A. 2375b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const ReferenceType *OriginalParamRef 2376b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor = OriginalParamType->getAs<ReferenceType>()) { 2377b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // We don't want to keep the reference around any more. 2378b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor OriginalParamType = OriginalParamRef->getPointeeType(); 2379b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2380b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor Qualifiers AQuals = A.getQualifiers(); 2381b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor Qualifiers DeducedAQuals = DeducedA.getQualifiers(); 2382b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (AQuals == DeducedAQuals) { 2383b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Qualifiers match; there's nothing to do. 2384b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } else if (!DeducedAQuals.compatiblyIncludes(AQuals)) { 2385c99f0ec89fd9782cfafd14d7b1b0a80151eab24aDouglas Gregor return true; 2386b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } else { 2387b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Qualifiers are compatible, so have the argument type adopt the 2388b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // deduced argument type's qualifiers as if we had performed the 2389b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // qualification conversion. 2390b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor A = Context.getQualifiedType(A.getUnqualifiedType(), DeducedAQuals); 2391b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2392b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2393b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2394b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // - The transformed A can be another pointer or pointer to member 2395b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // type that can be converted to the deduced A via a qualification 2396b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // conversion. 239718e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // 239818e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // Also allow conversions which merely strip [[noreturn]] from function types 239918e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // (recursively) as an extension. 240018e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // FIXME: Currently, this doesn't place nicely with qualfication conversions. 2401b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor bool ObjCLifetimeConversion = false; 240218e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth QualType ResultTy; 2403b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if ((A->isAnyPointerType() || A->isMemberPointerType()) && 240418e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth (S.IsQualificationConversion(A, DeducedA, false, 240518e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth ObjCLifetimeConversion) || 240618e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth S.IsNoReturnConversion(A, DeducedA, ResultTy))) 2407b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2408b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2409b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2410b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // - If P is a class and P has the form simple-template-id, then the 2411b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // transformed A can be a derived class of the deduced A. [...] 2412b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // [...] Likewise, if P is a pointer to a class of the form 2413b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // simple-template-id, the transformed A can be a pointer to a 2414b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // derived class pointed to by the deduced A. 2415b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const PointerType *OriginalParamPtr 2416b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor = OriginalParamType->getAs<PointerType>()) { 2417b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const PointerType *DeducedAPtr = DeducedA->getAs<PointerType>()) { 2418b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const PointerType *APtr = A->getAs<PointerType>()) { 2419b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (A->getPointeeType()->isRecordType()) { 2420b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor OriginalParamType = OriginalParamPtr->getPointeeType(); 2421b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor DeducedA = DeducedAPtr->getPointeeType(); 2422b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor A = APtr->getPointeeType(); 2423b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2424b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2425b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2426b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2427b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2428b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (Context.hasSameUnqualifiedType(A, DeducedA)) 2429b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2430b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2431b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (A->isRecordType() && isSimpleTemplateIdType(OriginalParamType) && 2432b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor S.IsDerivedFrom(A, DeducedA)) 2433b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2434b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2435b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return true; 2436b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor} 2437b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 24381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Finish template argument deduction for a function template, 243983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// checking the deduced template arguments for completeness and forming 244083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// the function template specialization. 2441dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor/// 2442dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor/// \param OriginalCallArgs If non-NULL, the original call arguments against 2443dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor/// which the deduced argument types should be compared. 24441eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::TemplateDeductionResult 244583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::FinishTemplateArgumentDeduction(FunctionTemplateDecl *FunctionTemplate, 24465f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 244702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified, 244883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *&Specialization, 2449dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor TemplateDeductionInfo &Info, 24505f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<OriginalCallArg> const *OriginalCallArgs) { 245183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 245283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 24531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 245451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Template argument deduction for function templates in a SFINAE context. 245551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Trap any errors that might occur. 245651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor SFINAETrap Trap(*this); 245751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 245851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Enter a new template instantiation context while we instantiate the 245951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // actual function declaration. 246051ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), 246151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate, Deduced.data(), Deduced.size(), 24629b623639378d53a675921ddfa7316034d571881eDouglas Gregor ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution, 24639b623639378d53a675921ddfa7316034d571881eDouglas Gregor Info); 246451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (Inst) 246551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor return TDK_InstantiationDepth; 246651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 246796db310ab7ca59e1890ddef25a3701bc2909d20fJohn McCall ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); 2468f5813826802c2e76cdc13cae834ebfd4518d74a6John McCall 246983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.deduct.type]p2: 247083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // [...] or if any template argument remains neither deduced nor 247183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly specified, template argument deduction fails. 24725f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> Builder; 2473b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { 2474b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NamedDecl *Param = TemplateParams->getParam(I); 2475dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 247651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (!Deduced[I].isNull()) { 24773273b0cea879c7af345d6bf98502bbf73fc4fde1Douglas Gregor if (I < NumExplicitlySpecified) { 247802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // We have already fully type-checked and converted this 2479dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // argument, because it was explicitly-specified. Just record the 24803273b0cea879c7af345d6bf98502bbf73fc4fde1Douglas Gregor // presence of this argument. 2481910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.push_back(Deduced[I]); 248202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor continue; 248302024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 248402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 248502024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // We have deduced this argument, so it still needs to be 248602024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // checked and converted. 248702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 248802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // First, for a non-type template parameter type that is 248902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // initialized by a declaration, we need the type of the 249002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // corresponding non-type template parameter. 249102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor QualType NTTPType; 2492dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NonTypeTemplateParmDecl *NTTP 2493dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = dyn_cast<NonTypeTemplateParmDecl>(Param)) { 2494b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTPType = NTTP->getType(); 2495b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (NTTPType->isDependentType()) { 2496dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, 2497b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Builder.data(), Builder.size()); 2498b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTPType = SubstType(NTTPType, 2499b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor MultiLevelTemplateArgumentList(TemplateArgs), 2500b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTP->getLocation(), 2501b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTP->getDeclName()); 2502b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (NTTPType.isNull()) { 2503b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2504b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2505dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, 2506dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.data(), 2507b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Builder.size())); 2508b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor return TDK_SubstitutionFailure; 250902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 251002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 251102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 251202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 2513b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (ConvertDeducedTemplateArgument(*this, Param, Deduced[I], 25146952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor FunctionTemplate, NTTPType, 0, Info, 251554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor true, Builder)) { 2516b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2517910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2518dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), 2519dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.size())); 252002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor return TDK_SubstitutionFailure; 252102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 252202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 252351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor continue; 252451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor } 2525dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2526ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // C++0x [temp.arg.explicit]p3: 2527dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // A trailing template parameter pack (14.5.3) not otherwise deduced will 2528ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // be deduced to an empty sequence of template arguments. 2529ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // FIXME: Where did the word "trailing" come from? 2530ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor if (Param->isTemplateParameterPack()) { 2531d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // We may have had explicitly-specified template arguments for this 2532d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template parameter pack. If so, our empty deduction extends the 2533d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // explicitly-specified set (C++0x [temp.arg.explicit]p9). 2534d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument *ExplicitArgs; 2535d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor unsigned NumExplicitArgs; 2536d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (CurrentInstantiationScope->getPartiallySubstitutedPack(&ExplicitArgs, 2537d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor &NumExplicitArgs) 2538d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor == Param) 2539d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Builder.push_back(TemplateArgument(ExplicitArgs, NumExplicitArgs)); 2540dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi else 2541d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Builder.push_back(TemplateArgument(0, 0)); 2542dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2543ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor continue; 2544ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor } 254551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 2546dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Substitute into the default template argument, if available. 254751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor TemplateArgumentLoc DefArg 254851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor = SubstDefaultTemplateArgumentIfAvailable(FunctionTemplate, 254951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getLocation(), 255051ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getSourceRange().getEnd(), 255151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Param, 255251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Builder); 255351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 255451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // If there was no default argument, deduction is incomplete. 255551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (DefArg.getArgument().isNull()) { 255683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.Param = makeTemplateParameter( 255751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor const_cast<NamedDecl *>(TemplateParams->getParam(I))); 255883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Incomplete; 255983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 2560dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 256151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Check whether we can actually use the default argument. 256251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (CheckTemplateArgument(Param, DefArg, 256351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate, 256451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getLocation(), 256551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getSourceRange().getEnd(), 25666952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor 0, Builder, 25678735b294a257a07ca158c28094d7324f0adf889aDouglas Gregor CTAK_Specified)) { 256851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Info.Param = makeTemplateParameter( 256951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor const_cast<NamedDecl *>(TemplateParams->getParam(I))); 2570910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2571dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), 2572910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.size())); 257351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor return TDK_SubstitutionFailure; 257451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor } 25751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 257651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // If we get here, we successfully used the default template argument. 257783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 25781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 257983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Form the template argument list from the deduced template arguments. 25801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *DeducedArgumentList 2581910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); 258283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.reset(DeducedArgumentList); 25831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 25841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Substitute the deduced template arguments into the function template 258583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // declaration to produce the function template specialization. 2586d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor DeclContext *Owner = FunctionTemplate->getDeclContext(); 2587d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor if (FunctionTemplate->getFriendObjectKind()) 2588d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor Owner = FunctionTemplate->getLexicalDeclContext(); 258983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Specialization = cast_or_null<FunctionDecl>( 2590d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor SubstDecl(FunctionTemplate->getTemplatedDecl(), Owner, 2591357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor MultiLevelTemplateArgumentList(*DeducedArgumentList))); 25925fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor if (!Specialization || Specialization->isInvalidDecl()) 259383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 25941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2595dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi assert(Specialization->getPrimaryTemplate()->getCanonicalDecl() == 2596f882574cf640d5c8355965e1c486f9d8d8ffcf47Douglas Gregor FunctionTemplate->getCanonicalDecl()); 2597dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 25981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If the template argument list is owned by the function template 259983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // specialization, release it. 2600ec20f46740a59758b12c22108002395bcf5b6f9bDouglas Gregor if (Specialization->getTemplateSpecializationArgs() == DeducedArgumentList && 2601ec20f46740a59758b12c22108002395bcf5b6f9bDouglas Gregor !Trap.hasErrorOccurred()) 260283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.take(); 26031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 26045fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor // There may have been an error that did not prevent us from constructing a 26055fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor // declaration. Mark the declaration invalid and return with a substitution 26065fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor // failure. 26075fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor if (Trap.hasErrorOccurred()) { 26085fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor Specialization->setInvalidDecl(true); 26095fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor return TDK_SubstitutionFailure; 26105fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor } 26115fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor 2612dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (OriginalCallArgs) { 2613dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // C++ [temp.deduct.call]p4: 2614dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // In general, the deduction process attempts to find template argument 2615dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // values that will make the deduced A identical to A (after the type A 2616dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // is transformed as described above). [...] 2617dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor for (unsigned I = 0, N = OriginalCallArgs->size(); I != N; ++I) { 2618dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor OriginalCallArg OriginalArg = (*OriginalCallArgs)[I]; 2619dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor unsigned ParamIdx = OriginalArg.ArgIdx; 2620dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2621dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (ParamIdx >= Specialization->getNumParams()) 2622dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor continue; 2623dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2624dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType DeducedA = Specialization->getParamDecl(ParamIdx)->getType(); 2625b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (CheckOriginalCallArgDeduction(*this, OriginalArg, DeducedA)) 2626b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return Sema::TDK_SubstitutionFailure; 2627dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor } 2628dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor } 2629dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 26309b623639378d53a675921ddfa7316034d571881eDouglas Gregor // If we suppressed any diagnostics while performing template argument 26319b623639378d53a675921ddfa7316034d571881eDouglas Gregor // deduction, and if we haven't already instantiated this declaration, 26329b623639378d53a675921ddfa7316034d571881eDouglas Gregor // keep track of these diagnostics. They'll be emitted if this specialization 26339b623639378d53a675921ddfa7316034d571881eDouglas Gregor // is actually used. 26349b623639378d53a675921ddfa7316034d571881eDouglas Gregor if (Info.diag_begin() != Info.diag_end()) { 26355f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >::iterator 26369b623639378d53a675921ddfa7316034d571881eDouglas Gregor Pos = SuppressedDiagnostics.find(Specialization->getCanonicalDecl()); 26379b623639378d53a675921ddfa7316034d571881eDouglas Gregor if (Pos == SuppressedDiagnostics.end()) 26389b623639378d53a675921ddfa7316034d571881eDouglas Gregor SuppressedDiagnostics[Specialization->getCanonicalDecl()] 26399b623639378d53a675921ddfa7316034d571881eDouglas Gregor .append(Info.diag_begin(), Info.diag_end()); 2640dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 26419b623639378d53a675921ddfa7316034d571881eDouglas Gregor 26421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return TDK_Success; 264383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 264483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 26459c72c6088d591ace8503b842d39448c2040f3033John McCall/// Gets the type of a function for template-argument-deducton 26469c72c6088d591ace8503b842d39448c2040f3033John McCall/// purposes when it's considered as part of an overload set. 2647eff92135d32039c9874dc356f3e93143af6069c1John McCallstatic QualType GetTypeOfFunction(ASTContext &Context, 26489c72c6088d591ace8503b842d39448c2040f3033John McCall const OverloadExpr::FindResult &R, 2649eff92135d32039c9874dc356f3e93143af6069c1John McCall FunctionDecl *Fn) { 2650eff92135d32039c9874dc356f3e93143af6069c1John McCall if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) 26519c72c6088d591ace8503b842d39448c2040f3033John McCall if (Method->isInstance()) { 26529c72c6088d591ace8503b842d39448c2040f3033John McCall // An instance method that's referenced in a form that doesn't 26539c72c6088d591ace8503b842d39448c2040f3033John McCall // look like a member pointer is just invalid. 26549c72c6088d591ace8503b842d39448c2040f3033John McCall if (!R.HasFormOfMemberPointer) return QualType(); 26559c72c6088d591ace8503b842d39448c2040f3033John McCall 2656eff92135d32039c9874dc356f3e93143af6069c1John McCall return Context.getMemberPointerType(Fn->getType(), 2657eff92135d32039c9874dc356f3e93143af6069c1John McCall Context.getTypeDeclType(Method->getParent()).getTypePtr()); 26589c72c6088d591ace8503b842d39448c2040f3033John McCall } 26599c72c6088d591ace8503b842d39448c2040f3033John McCall 26609c72c6088d591ace8503b842d39448c2040f3033John McCall if (!R.IsAddressOfOperand) return Fn->getType(); 2661eff92135d32039c9874dc356f3e93143af6069c1John McCall return Context.getPointerType(Fn->getType()); 2662eff92135d32039c9874dc356f3e93143af6069c1John McCall} 2663eff92135d32039c9874dc356f3e93143af6069c1John McCall 2664eff92135d32039c9874dc356f3e93143af6069c1John McCall/// Apply the deduction rules for overload sets. 2665eff92135d32039c9874dc356f3e93143af6069c1John McCall/// 2666eff92135d32039c9874dc356f3e93143af6069c1John McCall/// \return the null type if this argument should be treated as an 2667eff92135d32039c9874dc356f3e93143af6069c1John McCall/// undeduced context 2668eff92135d32039c9874dc356f3e93143af6069c1John McCallstatic QualType 2669eff92135d32039c9874dc356f3e93143af6069c1John McCallResolveOverloadForDeduction(Sema &S, TemplateParameterList *TemplateParams, 267075f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor Expr *Arg, QualType ParamType, 267175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor bool ParamWasReference) { 2672dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 26739c72c6088d591ace8503b842d39448c2040f3033John McCall OverloadExpr::FindResult R = OverloadExpr::find(Arg); 2674eff92135d32039c9874dc356f3e93143af6069c1John McCall 26759c72c6088d591ace8503b842d39448c2040f3033John McCall OverloadExpr *Ovl = R.Expression; 2676eff92135d32039c9874dc356f3e93143af6069c1John McCall 267775f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor // C++0x [temp.deduct.call]p4 267875f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor unsigned TDF = 0; 267975f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor if (ParamWasReference) 268075f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor TDF |= TDF_ParamWithReferenceType; 268175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor if (R.IsAddressOfOperand) 268275f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor TDF |= TDF_IgnoreQualifiers; 268375f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor 2684eff92135d32039c9874dc356f3e93143af6069c1John McCall // If there were explicit template arguments, we can only find 2685eff92135d32039c9874dc356f3e93143af6069c1John McCall // something via C++ [temp.arg.explicit]p3, i.e. if the arguments 2686eff92135d32039c9874dc356f3e93143af6069c1John McCall // unambiguously name a full specialization. 26877bb12da2b0749eeebb21854c77877736969e59f2John McCall if (Ovl->hasExplicitTemplateArgs()) { 2688eff92135d32039c9874dc356f3e93143af6069c1John McCall // But we can still look for an explicit specialization. 2689eff92135d32039c9874dc356f3e93143af6069c1John McCall if (FunctionDecl *ExplicitSpec 26907bb12da2b0749eeebb21854c77877736969e59f2John McCall = S.ResolveSingleFunctionTemplateSpecialization(Ovl)) 26919c72c6088d591ace8503b842d39448c2040f3033John McCall return GetTypeOfFunction(S.Context, R, ExplicitSpec); 2692eff92135d32039c9874dc356f3e93143af6069c1John McCall return QualType(); 2693eff92135d32039c9874dc356f3e93143af6069c1John McCall } 2694eff92135d32039c9874dc356f3e93143af6069c1John McCall 2695eff92135d32039c9874dc356f3e93143af6069c1John McCall // C++0x [temp.deduct.call]p6: 2696eff92135d32039c9874dc356f3e93143af6069c1John McCall // When P is a function type, pointer to function type, or pointer 2697eff92135d32039c9874dc356f3e93143af6069c1John McCall // to member function type: 2698eff92135d32039c9874dc356f3e93143af6069c1John McCall 2699eff92135d32039c9874dc356f3e93143af6069c1John McCall if (!ParamType->isFunctionType() && 2700eff92135d32039c9874dc356f3e93143af6069c1John McCall !ParamType->isFunctionPointerType() && 2701eff92135d32039c9874dc356f3e93143af6069c1John McCall !ParamType->isMemberFunctionPointerType()) 2702eff92135d32039c9874dc356f3e93143af6069c1John McCall return QualType(); 2703eff92135d32039c9874dc356f3e93143af6069c1John McCall 2704eff92135d32039c9874dc356f3e93143af6069c1John McCall QualType Match; 27057bb12da2b0749eeebb21854c77877736969e59f2John McCall for (UnresolvedSetIterator I = Ovl->decls_begin(), 27067bb12da2b0749eeebb21854c77877736969e59f2John McCall E = Ovl->decls_end(); I != E; ++I) { 2707eff92135d32039c9874dc356f3e93143af6069c1John McCall NamedDecl *D = (*I)->getUnderlyingDecl(); 2708eff92135d32039c9874dc356f3e93143af6069c1John McCall 2709eff92135d32039c9874dc356f3e93143af6069c1John McCall // - If the argument is an overload set containing one or more 2710eff92135d32039c9874dc356f3e93143af6069c1John McCall // function templates, the parameter is treated as a 2711eff92135d32039c9874dc356f3e93143af6069c1John McCall // non-deduced context. 2712eff92135d32039c9874dc356f3e93143af6069c1John McCall if (isa<FunctionTemplateDecl>(D)) 2713eff92135d32039c9874dc356f3e93143af6069c1John McCall return QualType(); 2714eff92135d32039c9874dc356f3e93143af6069c1John McCall 2715eff92135d32039c9874dc356f3e93143af6069c1John McCall FunctionDecl *Fn = cast<FunctionDecl>(D); 27169c72c6088d591ace8503b842d39448c2040f3033John McCall QualType ArgType = GetTypeOfFunction(S.Context, R, Fn); 27179c72c6088d591ace8503b842d39448c2040f3033John McCall if (ArgType.isNull()) continue; 2718eff92135d32039c9874dc356f3e93143af6069c1John McCall 271975f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor // Function-to-pointer conversion. 2720dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (!ParamWasReference && ParamType->isPointerType() && 272175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor ArgType->isFunctionType()) 272275f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor ArgType = S.Context.getPointerType(ArgType); 2723dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2724eff92135d32039c9874dc356f3e93143af6069c1John McCall // - If the argument is an overload set (not containing function 2725eff92135d32039c9874dc356f3e93143af6069c1John McCall // templates), trial argument deduction is attempted using each 2726eff92135d32039c9874dc356f3e93143af6069c1John McCall // of the members of the set. If deduction succeeds for only one 2727eff92135d32039c9874dc356f3e93143af6069c1John McCall // of the overload set members, that member is used as the 2728eff92135d32039c9874dc356f3e93143af6069c1John McCall // argument value for the deduction. If deduction succeeds for 2729eff92135d32039c9874dc356f3e93143af6069c1John McCall // more than one member of the overload set the parameter is 2730eff92135d32039c9874dc356f3e93143af6069c1John McCall // treated as a non-deduced context. 2731eff92135d32039c9874dc356f3e93143af6069c1John McCall 2732eff92135d32039c9874dc356f3e93143af6069c1John McCall // We do all of this in a fresh context per C++0x [temp.deduct.type]p2: 2733eff92135d32039c9874dc356f3e93143af6069c1John McCall // Type deduction is done independently for each P/A pair, and 2734eff92135d32039c9874dc356f3e93143af6069c1John McCall // the deduced template argument values are then combined. 2735eff92135d32039c9874dc356f3e93143af6069c1John McCall // So we do not reject deductions which were made elsewhere. 27365f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 8> 273702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor Deduced(TemplateParams->size()); 27382a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(S.Context, Ovl->getNameLoc()); 2739eff92135d32039c9874dc356f3e93143af6069c1John McCall Sema::TemplateDeductionResult Result 2740bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, ParamType, 2741bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ArgType, Info, Deduced, TDF); 2742eff92135d32039c9874dc356f3e93143af6069c1John McCall if (Result) continue; 2743eff92135d32039c9874dc356f3e93143af6069c1John McCall if (!Match.isNull()) return QualType(); 2744eff92135d32039c9874dc356f3e93143af6069c1John McCall Match = ArgType; 2745eff92135d32039c9874dc356f3e93143af6069c1John McCall } 2746eff92135d32039c9874dc356f3e93143af6069c1John McCall 2747eff92135d32039c9874dc356f3e93143af6069c1John McCall return Match; 2748eff92135d32039c9874dc356f3e93143af6069c1John McCall} 2749eff92135d32039c9874dc356f3e93143af6069c1John McCall 2750dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief Perform the adjustments to the parameter and argument types 2751f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// described in C++ [temp.deduct.call]. 2752f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// 2753f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// \returns true if the caller should not attempt to perform any template 2754f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// argument deduction based on this P/A pair. 2755f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregorstatic bool AdjustFunctionParmAndArgTypesForDeduction(Sema &S, 2756f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TemplateParameterList *TemplateParams, 2757f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType &ParamType, 2758f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType &ArgType, 2759f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg, 2760f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned &TDF) { 2761f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p3: 27620099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // If P is a cv-qualified type, the top level cv-qualifiers of P's type 2763f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // are ignored for type deduction. 2764a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor if (ParamType.hasQualifiers()) 2765a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor ParamType = ParamType.getUnqualifiedType(); 2766f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>(); 2767f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) { 276834b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType PointeeType = ParamRefType->getPointeeType(); 276934b41d939a1328f484511c6002ba2456db879a29Richard Smith 2770f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor // If the argument has incomplete array type, try to complete it's type. 2771f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor if (ArgType->isIncompleteArrayType() && 2772f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor !S.RequireCompleteExprType(Arg, S.PDiag(), 2773f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor std::make_pair(SourceLocation(), S.PDiag()))) 2774f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor ArgType = Arg->getType(); 2775f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor 27762ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // [C++0x] If P is an rvalue reference to a cv-unqualified 27772ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // template parameter and the argument is an lvalue, the type 27782ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // "lvalue reference to A" is used in place of A for type 27792ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // deduction. 278034b41d939a1328f484511c6002ba2456db879a29Richard Smith if (isa<RValueReferenceType>(ParamType)) { 278134b41d939a1328f484511c6002ba2456db879a29Richard Smith if (!PointeeType.getQualifiers() && 278234b41d939a1328f484511c6002ba2456db879a29Richard Smith isa<TemplateTypeParmType>(PointeeType) && 27839625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->Classify(S.Context).isLValue() && 27849625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->getType() != S.Context.OverloadTy && 27859625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->getType() != S.Context.BoundMemberTy) 27862ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor ArgType = S.Context.getLValueReferenceType(ArgType); 27872ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor } 27882ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor 2789f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // [...] If P is a reference type, the type referred to by P is used 2790f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // for type deduction. 279134b41d939a1328f484511c6002ba2456db879a29Richard Smith ParamType = PointeeType; 2792f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2793dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2794f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Overload sets usually make this parameter an undeduced 2795f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // context, but there are sometimes special circumstances. 2796f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType == S.Context.OverloadTy) { 2797f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = ResolveOverloadForDeduction(S, TemplateParams, 2798f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Arg, ParamType, 2799f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamRefType != 0); 2800f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType.isNull()) 2801f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return true; 2802f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2803dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2804f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) { 2805f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p3: 2806f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // [...] If P is of the form T&&, where T is a template parameter, and 2807f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the argument is an lvalue, the type A& is used in place of A for 2808f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type deduction. 2809f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType->isRValueReferenceType() && 2810f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamRefType->getAs<TemplateTypeParmType>() && 2811f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Arg->isLValue()) 2812f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getLValueReferenceType(ArgType); 2813f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } else { 2814f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++ [temp.deduct.call]p2: 2815f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // If P is not a reference type: 2816f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If A is an array type, the pointer type produced by the 2817f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // array-to-pointer standard conversion (4.2) is used in place of 2818f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // A for type deduction; otherwise, 2819f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType->isArrayType()) 2820f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getArrayDecayedType(ArgType); 2821f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If A is a function type, the pointer type produced by the 2822f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // function-to-pointer standard conversion (4.3) is used in place 2823f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // of A for type deduction; otherwise, 2824f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else if (ArgType->isFunctionType()) 2825f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getPointerType(ArgType); 2826f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else { 28270099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - If A is a cv-qualified type, the top level cv-qualifiers of A's 2828f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type are ignored for type deduction. 2829a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor ArgType = ArgType.getUnqualifiedType(); 2830f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2831f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2832dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2833f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p4: 2834f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // In general, the deduction process attempts to find template argument 2835f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // values that will make the deduced A identical to A (after the type A 2836f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // is transformed as described above). [...] 2837f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF = TDF_SkipNonDependent; 2838dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2839f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If the original P is a reference type, the deduced A (i.e., the 2840f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type referred to by the reference) can be more cv-qualified than 2841f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the transformed A. 2842f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) 2843f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_ParamWithReferenceType; 2844f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - The transformed A can be another pointer or pointer to member 2845f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type that can be converted to the deduced A via a qualification 2846f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // conversion (4.4). 2847f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType->isPointerType() || ArgType->isMemberPointerType() || 2848f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType->isObjCObjectPointerType()) 2849f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_IgnoreQualifiers; 2850f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If P is a class and P has the form simple-template-id, then the 2851f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // transformed A can be a derived class of the deduced A. Likewise, 2852f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // if P is a pointer to a class of the form simple-template-id, the 2853f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // transformed A can be a pointer to a derived class pointed to by 2854f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the deduced A. 2855f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (isSimpleTemplateIdType(ParamType) || 2856f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor (isa<PointerType>(ParamType) && 2857f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor isSimpleTemplateIdType( 2858f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType->getAs<PointerType>()->getPointeeType()))) 2859f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_DerivedClass; 2860dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2861f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return false; 2862f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor} 2863f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor 2864dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregorstatic bool hasDeducibleTemplateParameters(Sema &S, 2865dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor FunctionTemplateDecl *FunctionTemplate, 2866dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType T); 2867dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2868e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \brief Perform template argument deduction from a function call 2869e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// (C++ [temp.deduct.call]). 2870e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2871e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param FunctionTemplate the function template for which we are performing 2872e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// template argument deduction. 2873e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 287448026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// \param ExplicitTemplateArguments the explicit template arguments provided 287548026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// for this call. 28766db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor/// 2877e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Args the function call arguments 2878e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2879e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param NumArgs the number of arguments in Args 2880e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 288148026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// \param Name the name of the function being called. This is only significant 288248026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// when the function template is a conversion function template, in which 288348026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// case this routine will also perform template argument deduction based on 2884dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// the function to which 288548026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// 2886e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Specialization if template argument deduction was successful, 28871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// this will be set to the function template specialization produced by 2888e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// template argument deduction. 2889e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2890e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Info the argument will be updated to provide additional information 2891e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// about template argument deduction. 2892e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2893e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \returns the result of template argument deduction. 2894e53060fa78ad7e98352049f72787bdb7543e2a48Douglas GregorSema::TemplateDeductionResult 2895e53060fa78ad7e98352049f72787bdb7543e2a48Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 289667714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 2897e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor Expr **Args, unsigned NumArgs, 2898e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor FunctionDecl *&Specialization, 2899e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor TemplateDeductionInfo &Info) { 2900e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 29016db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor 2902e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // C++ [temp.deduct.call]p1: 2903e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // Template argument deduction is done by comparing each function template 2904e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // parameter type (call it P) with the type of the corresponding argument 2905e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // of the call (call it A) as described below. 2906e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor unsigned CheckArgs = NumArgs; 29076db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor if (NumArgs < Function->getMinRequiredArguments()) 2908e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor return TDK_TooFewArguments; 2909e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor else if (NumArgs > Function->getNumParams()) { 29101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *Proto 2911183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Function->getType()->getAs<FunctionProtoType>(); 2912f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (Proto->isTemplateVariadic()) 2913f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor /* Do nothing */; 2914f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else if (Proto->isVariadic()) 2915f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor CheckArgs = Function->getNumParams(); 2916dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi else 2917e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor return TDK_TooManyArguments; 2918e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 29191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29206db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // The types of the parameters from which we will perform template argument 29216db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // deduction. 29222a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 2923e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor TemplateParameterList *TemplateParams 2924e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor = FunctionTemplate->getTemplateParameters(); 29255f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 29265f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> ParamTypes; 292702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified = 0; 2928d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs) { 292983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionResult Result = 293083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor SubstituteExplicitTemplateArguments(FunctionTemplate, 2931d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall *ExplicitTemplateArgs, 293283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Deduced, 293383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes, 293483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 0, 293583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info); 293683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (Result) 293783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return Result; 293802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 293902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified = Deduced.size(); 29406db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor } else { 29416db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // Just fill in the parameter types from the function declaration. 2942f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) 29436db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor ParamTypes.push_back(Function->getParamDecl(I)->getType()); 29446db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor } 29451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29466db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // Deduce template arguments from the function parameters. 29471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced.resize(TemplateParams->size()); 2948f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned ArgIdx = 0; 29495f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<OriginalCallArg, 4> OriginalCallArgs; 2950dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (unsigned ParamIdx = 0, NumParams = ParamTypes.size(); 2951f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamIdx != NumParams; ++ParamIdx) { 2952dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType OrigParamType = ParamTypes[ParamIdx]; 2953dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType ParamType = OrigParamType; 2954dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2955dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const PackExpansionType *ParamExpansion 2956f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor = dyn_cast<PackExpansionType>(ParamType); 2957f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (!ParamExpansion) { 2958f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Simple case: matching a function parameter to a function argument. 2959f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgIdx >= CheckArgs) 2960f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 2961dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2962f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg = Args[ArgIdx++]; 2963f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ArgType = Arg->getType(); 2964dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2965f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned TDF = 0; 2966f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, 2967f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Arg, 2968f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) 2969f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor continue; 2970dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2971d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor // If we have nothing to deduce, we're done. 2972d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor if (!hasDeducibleTemplateParameters(*this, FunctionTemplate, ParamType)) 2973d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor continue; 2974d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor 297584760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // If the argument is an initializer list ... 297684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (InitListExpr *ILE = dyn_cast<InitListExpr>(Arg)) { 297784760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // ... then the parameter is an undeduced context, unless the parameter 297884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // type is (reference to cv) std::initializer_list<P'>, in which case 297984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // deduction is done for each element of the initializer list, and the 298084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // result is the deduced type if it's the same for all elements. 298184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl QualType X; 298284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // Removing references was already done. 298384760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (!isStdInitializerList(ParamType, &X)) 298484760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl continue; 298584760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl 298684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl for (unsigned i = 0, e = ILE->getNumInits(); i < e; ++i) { 298784760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (TemplateDeductionResult Result = 298884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, X, 298984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl ILE->getInit(i)->getType(), 299084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl Info, Deduced, TDF)) 299184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl return Result; 299284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 299384760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // Don't track the argument type, since an initializer list has none. 299484760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl continue; 299584760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 299684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl 2997dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // Keep track of the argument type and corresponding parameter index, 2998dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // so we can check for compatibility between the deduced A and A. 2999d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor OriginalCallArgs.push_back(OriginalCallArg(OrigParamType, ArgIdx-1, 3000d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor ArgType)); 3001dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 3002f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (TemplateDeductionResult Result 3003bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, 3004bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl ParamType, ArgType, 3005bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF)) 3006f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return Result; 30071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3008f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor continue; 300975f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor } 3010dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3011f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p1: 3012dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // For a function parameter pack that occurs at the end of the 3013dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter-declaration-list, the type A of each remaining argument of 3014dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the call is compared with the type P of the declarator-id of the 3015dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // function parameter pack. Each comparison deduces template arguments 3016dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // for subsequent positions in the template parameter packs expanded by 30177d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // the function parameter pack. For a function parameter pack that does 3018dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // not occur at the end of the parameter-declaration-list, the type of 30197d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // the parameter pack is a non-deduced context. 30207d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor if (ParamIdx + 1 < NumParams) 30217d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor break; 3022dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3023f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ParamPattern = ParamExpansion->getPattern(); 30245f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<unsigned, 2> PackIndices; 3025f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor { 3026f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor llvm::BitVector SawIndices(TemplateParams->size()); 30275f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UnexpandedParameterPack, 2> Unexpanded; 3028f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor collectUnexpandedParameterPacks(ParamPattern, Unexpanded); 3029f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 3030f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned Depth, Index; 3031f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 3032f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 3033f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor SawIndices[Index] = true; 3034f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor PackIndices.push_back(Index); 3035f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3036f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3037f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3038f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 3039dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3040d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Keep track of the deduced template arguments for each parameter pack 3041dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 3042d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template argument (the inner SmallVectors). 30435f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> 3044d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 30455f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 2> 3046d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor SavedPacks(PackIndices.size()); 30475429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor PrepareArgumentPackDeduction(*this, Deduced, PackIndices, SavedPacks, 3048dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks); 3049f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor bool HasAnyArguments = false; 3050f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (; ArgIdx < NumArgs; ++ArgIdx) { 3051f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor HasAnyArguments = true; 3052dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3053dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType OrigParamType = ParamPattern; 3054dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor ParamType = OrigParamType; 3055f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg = Args[ArgIdx]; 3056f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ArgType = Arg->getType(); 3057dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 3058f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned TDF = 0; 3059f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, 3060f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Arg, 3061f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) { 3062f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // We can't actually perform any deduction for this argument, so stop 3063f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // deduction at this point. 3064f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ++ArgIdx; 3065f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 3066f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3067dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 306884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // As above, initializer lists need special handling. 306984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (InitListExpr *ILE = dyn_cast<InitListExpr>(Arg)) { 307084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl QualType X; 307184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (!isStdInitializerList(ParamType, &X)) { 307284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl ++ArgIdx; 307384760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl break; 307484760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 3075dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 307684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl for (unsigned i = 0, e = ILE->getNumInits(); i < e; ++i) { 307784760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (TemplateDeductionResult Result = 307884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, X, 307984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl ILE->getInit(i)->getType(), 308084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl Info, Deduced, TDF)) 308184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl return Result; 308284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 308384760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } else { 308484760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl 308584760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // Keep track of the argument type and corresponding argument index, 308684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl // so we can check for compatibility between the deduced A and A. 308784760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (hasDeducibleTemplateParameters(*this, FunctionTemplate, ParamType)) 308884760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl OriginalCallArgs.push_back(OriginalCallArg(OrigParamType, ArgIdx, 308984760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl ArgType)); 309084760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl 309184760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl if (TemplateDeductionResult Result 309284760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, 309384760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl ParamType, ArgType, Info, 309484760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl Deduced, TDF)) 309584760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl return Result; 309684760e3a5d885ab19b5d11aafe78dfdfe2911e3aSebastian Redl } 3097eff92135d32039c9874dc356f3e93143af6069c1John McCall 3098f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 3099f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 3100f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // for that pack, then clear out the deduced argument. 3101f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 3102f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 3103f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (!DeducedArg.isNull()) { 3104f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 3105f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor DeducedArg = DeducedTemplateArgument(); 3106f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3107e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 3108e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 3109dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3110f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 3111f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // pack expansion. 31120216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 3113dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(*this, TemplateParams, HasAnyArguments, 31140216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 31150216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 3116dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 31171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3118f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // After we've matching against a parameter pack, we're done. 3119f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 3120e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 312165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 31221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 312302024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified, 3124dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor Specialization, Info, &OriginalCallArgs); 312583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 3126127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor 312783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \brief Deduce template arguments when taking the address of a function 31284b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template (C++ [temp.deduct.funcaddr]) or matching a specialization to 31294b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// a template. 313083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 313183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionTemplate the function template for which we are performing 313283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template argument deduction. 313383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 3134dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param ExplicitTemplateArguments the explicitly-specified template 31354b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// arguments. 313683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 313783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param ArgFunctionType the function type that will be used as the 313883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// "argument" type (A) when performing template argument deduction from the 31394b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// function template's function type. This type may be NULL, if there is no 31404b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// argument type to compare against, in C++0x [temp.arg.explicit]p3. 314183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 314283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Specialization if template argument deduction was successful, 31431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// this will be set to the function template specialization produced by 314483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template argument deduction. 314583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 314683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Info the argument will be updated to provide additional information 314783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// about template argument deduction. 314883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 314983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \returns the result of template argument deduction. 315083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::TemplateDeductionResult 315183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 315267714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 315383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType ArgFunctionType, 315483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *&Specialization, 315583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionInfo &Info) { 315683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 315783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 315883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 315983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType FunctionType = Function->getType(); 31601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 316183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Substitute any explicit template arguments. 31622a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 31635f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 316402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified = 0; 31655f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> ParamTypes; 3166d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs) { 31671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (TemplateDeductionResult Result 31681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump = SubstituteExplicitTemplateArguments(FunctionTemplate, 3169d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall *ExplicitTemplateArgs, 31701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced, ParamTypes, 317183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor &FunctionType, Info)) 317283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return Result; 317302024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 317402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified = Deduced.size(); 3175127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor } 317683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 317783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Template argument deduction for function templates in a SFINAE context. 317883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Trap any errors that might occur. 31791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 31801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3181eff92135d32039c9874dc356f3e93143af6069c1John McCall Deduced.resize(TemplateParams->size()); 3182eff92135d32039c9874dc356f3e93143af6069c1John McCall 31834b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor if (!ArgFunctionType.isNull()) { 31844b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor // Deduce template arguments from the function type. 31854b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor if (TemplateDeductionResult Result 3186bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, 31874b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor FunctionType, ArgFunctionType, Info, 318873b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Deduced, TDF_TopLevelParameterTypeList)) 31894b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor return Result; 31904b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor } 3191fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 3192dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (TemplateDeductionResult Result 3193fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 3194fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor NumExplicitlySpecified, 3195fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor Specialization, Info)) 3196fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return Result; 3197fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 3198fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor // If the requested function type does not match the actual type of the 3199fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor // specialization, template argument deduction fails. 3200fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor if (!ArgFunctionType.isNull() && 3201fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor !Context.hasSameType(ArgFunctionType, Specialization->getType())) 3202fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return TDK_NonDeducedMismatch; 3203fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 3204fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return TDK_Success; 3205e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor} 3206e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor 320765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \brief Deduce template arguments for a templated conversion 320865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// function (C++ [temp.deduct.conv]) and, if successful, produce a 320965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// conversion function template specialization. 321065ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::TemplateDeductionResult 321165ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 321265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType ToType, 321365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor CXXConversionDecl *&Specialization, 321465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateDeductionInfo &Info) { 32151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump CXXConversionDecl *Conv 321665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor = cast<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()); 321765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType FromType = Conv->getConversionType(); 321865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 321965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Canonicalize the types for deduction. 322065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType P = Context.getCanonicalType(FromType); 322165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType A = Context.getCanonicalType(ToType); 322265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 32235453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p2: 322465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // If P is a reference type, the type referred to by P is used for 322565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type deduction. 322665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (const ReferenceType *PRef = P->getAs<ReferenceType>()) 322765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = PRef->getPointeeType(); 322865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 32295453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p4: 32305453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // [...] If A is a reference type, the type referred to by A is used 323165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // for type deduction. 323265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (const ReferenceType *ARef = A->getAs<ReferenceType>()) 32335453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor A = ARef->getPointeeType().getUnqualifiedType(); 32345453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++ [temp.deduct.conv]p3: 323565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // 32361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If A is not a reference type: 323765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else { 323865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor assert(!A->isReferenceType() && "Reference types were handled above"); 323965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 324065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is an array type, the pointer type produced by the 32411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // array-to-pointer standard conversion (4.2) is used in place 324265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // of P for type deduction; otherwise, 324365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (P->isArrayType()) 324465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = Context.getArrayDecayedType(P); 324565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is a function type, the pointer type produced by the 324665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // function-to-pointer standard conversion (4.3) is used in 324765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // place of P for type deduction; otherwise, 324865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else if (P->isFunctionType()) 324965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = Context.getPointerType(P); 325065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is a cv-qualified type, the top level cv-qualifiers of 32510099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // P's type are ignored for type deduction. 325265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else 325365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = P.getUnqualifiedType(); 325465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 32555453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p4: 32560099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // If A is a cv-qualified type, the top level cv-qualifiers of A's 32575453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // type are ignored for type deduction. If A is a reference type, the type 32585453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // referred to by A is used for type deduction. 325965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor A = A.getUnqualifiedType(); 326065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor } 326165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 326265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Template argument deduction for function templates in a SFINAE context. 326365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Trap any errors that might occur. 32641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 326565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 326665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // C++ [temp.deduct.conv]p1: 326765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Template argument deduction is done by comparing the return 326865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type of the template conversion function (call it P) with the 326965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type that is required as the result of the conversion (call it 327065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // A) as described in 14.8.2.4. 327165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateParameterList *TemplateParams 327265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor = FunctionTemplate->getTemplateParameters(); 32735f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 32741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced.resize(TemplateParams->size()); 327565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 327665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // C++0x [temp.deduct.conv]p4: 327765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // In general, the deduction process attempts to find template 327865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // argument values that will make the deduced A identical to 327965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // A. However, there are two cases that allow a difference: 328065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor unsigned TDF = 0; 328165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If the original A is a reference type, A can be more 328265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // cv-qualified than the deduced A (i.e., the type referred to 328365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // by the reference) 328465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (ToType->isReferenceType()) 328565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TDF |= TDF_ParamWithReferenceType; 328665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - The deduced A can be another pointer or pointer to member 32870099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // type that can be converted to A via a qualification 328865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // conversion. 328965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // 329065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // (C++0x [temp.deduct.conv]p6 clarifies that this only happens when 329165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // both P and A are pointers or member pointers. In this case, we 329265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // just ignore cv-qualifiers completely). 329365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if ((P->isPointerType() && A->isPointerType()) || 32942cae1e216c12c7574f5ac59cb0844d22bed9401dDouglas Gregor (P->isMemberPointerType() && A->isMemberPointerType())) 329565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TDF |= TDF_IgnoreQualifiers; 329665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (TemplateDeductionResult Result 3297bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl = DeduceTemplateArgumentsByTypeMatch(*this, TemplateParams, 3298bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl P, A, Info, Deduced, TDF)) 329965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return Result; 330065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 330165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Finish template argument deduction. 33022a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 330365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor FunctionDecl *Spec = 0; 330465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateDeductionResult Result 3305dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 0, Spec, 330602024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor Info); 330765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor Specialization = cast_or_null<CXXConversionDecl>(Spec); 330865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return Result; 330965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor} 331065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 33114b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \brief Deduce template arguments for a function template when there is 33124b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// nothing to deduce against (C++0x [temp.arg.explicit]p3). 33134b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 33144b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param FunctionTemplate the function template for which we are performing 33154b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template argument deduction. 33164b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 3317dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param ExplicitTemplateArguments the explicitly-specified template 33184b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// arguments. 33194b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 33204b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param Specialization if template argument deduction was successful, 33214b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// this will be set to the function template specialization produced by 33224b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template argument deduction. 33234b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 33244b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param Info the argument will be updated to provide additional information 33254b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// about template argument deduction. 33264b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 33274b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \returns the result of template argument deduction. 33284b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas GregorSema::TemplateDeductionResult 33294b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 333067714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 33314b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor FunctionDecl *&Specialization, 33324b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor TemplateDeductionInfo &Info) { 33334b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor return DeduceTemplateArguments(FunctionTemplate, ExplicitTemplateArgs, 33344b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor QualType(), Specialization, Info); 33354b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor} 33364b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor 333734b41d939a1328f484511c6002ba2456db879a29Richard Smithnamespace { 333834b41d939a1328f484511c6002ba2456db879a29Richard Smith /// Substitute the 'auto' type specifier within a type for a given replacement 333934b41d939a1328f484511c6002ba2456db879a29Richard Smith /// type. 334034b41d939a1328f484511c6002ba2456db879a29Richard Smith class SubstituteAutoTransform : 334134b41d939a1328f484511c6002ba2456db879a29Richard Smith public TreeTransform<SubstituteAutoTransform> { 334234b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Replacement; 334334b41d939a1328f484511c6002ba2456db879a29Richard Smith public: 334434b41d939a1328f484511c6002ba2456db879a29Richard Smith SubstituteAutoTransform(Sema &SemaRef, QualType Replacement) : 334534b41d939a1328f484511c6002ba2456db879a29Richard Smith TreeTransform<SubstituteAutoTransform>(SemaRef), Replacement(Replacement) { 334634b41d939a1328f484511c6002ba2456db879a29Richard Smith } 334734b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType TransformAutoType(TypeLocBuilder &TLB, AutoTypeLoc TL) { 334834b41d939a1328f484511c6002ba2456db879a29Richard Smith // If we're building the type pattern to deduce against, don't wrap the 334934b41d939a1328f484511c6002ba2456db879a29Richard Smith // substituted type in an AutoType. Certain template deduction rules 335034b41d939a1328f484511c6002ba2456db879a29Richard Smith // apply only when a template type parameter appears directly (and not if 335134b41d939a1328f484511c6002ba2456db879a29Richard Smith // the parameter is found through desugaring). For instance: 335234b41d939a1328f484511c6002ba2456db879a29Richard Smith // auto &&lref = lvalue; 335334b41d939a1328f484511c6002ba2456db879a29Richard Smith // must transform into "rvalue reference to T" not "rvalue reference to 335434b41d939a1328f484511c6002ba2456db879a29Richard Smith // auto type deduced as T" in order for [temp.deduct.call]p3 to apply. 335534b41d939a1328f484511c6002ba2456db879a29Richard Smith if (isa<TemplateTypeParmType>(Replacement)) { 335634b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Result = Replacement; 335734b41d939a1328f484511c6002ba2456db879a29Richard Smith TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result); 335834b41d939a1328f484511c6002ba2456db879a29Richard Smith NewTL.setNameLoc(TL.getNameLoc()); 335934b41d939a1328f484511c6002ba2456db879a29Richard Smith return Result; 336034b41d939a1328f484511c6002ba2456db879a29Richard Smith } else { 336134b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Result = RebuildAutoType(Replacement); 336234b41d939a1328f484511c6002ba2456db879a29Richard Smith AutoTypeLoc NewTL = TLB.push<AutoTypeLoc>(Result); 336334b41d939a1328f484511c6002ba2456db879a29Richard Smith NewTL.setNameLoc(TL.getNameLoc()); 336434b41d939a1328f484511c6002ba2456db879a29Richard Smith return Result; 336534b41d939a1328f484511c6002ba2456db879a29Richard Smith } 336634b41d939a1328f484511c6002ba2456db879a29Richard Smith } 336734b41d939a1328f484511c6002ba2456db879a29Richard Smith }; 336834b41d939a1328f484511c6002ba2456db879a29Richard Smith} 336934b41d939a1328f484511c6002ba2456db879a29Richard Smith 337034b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \brief Deduce the type for an auto type-specifier (C++0x [dcl.spec.auto]p6) 337134b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 337234b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Type the type pattern using the auto type-specifier. 337334b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 337434b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Init the initializer for the variable whose type is to be deduced. 337534b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 337634b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Result if type deduction was successful, this will be set to the 337734b41d939a1328f484511c6002ba2456db879a29Richard Smith/// deduced type. This may still contain undeduced autos if the type is 3378a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// dependent. This will be set to null if deduction succeeded, but auto 3379a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// substitution failed; the appropriate diagnostic will already have been 3380a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// produced in that case. 338134b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 338234b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \returns true if deduction succeeded, false if it failed. 338334b41d939a1328f484511c6002ba2456db879a29Richard Smithbool 338432509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCallSema::DeduceAutoType(TypeSourceInfo *Type, Expr *&Init, 3385a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith TypeSourceInfo *&Result) { 338632509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall if (Init->getType()->isNonOverloadPlaceholderType()) { 338732509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall ExprResult result = CheckPlaceholderExpr(Init); 338832509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall if (result.isInvalid()) return false; 338932509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall Init = result.take(); 339032509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall } 339132509f1e60451d86e9fbc473b6e853ba10b5fd1eJohn McCall 339234b41d939a1328f484511c6002ba2456db879a29Richard Smith if (Init->isTypeDependent()) { 339334b41d939a1328f484511c6002ba2456db879a29Richard Smith Result = Type; 339434b41d939a1328f484511c6002ba2456db879a29Richard Smith return true; 339534b41d939a1328f484511c6002ba2456db879a29Richard Smith } 339634b41d939a1328f484511c6002ba2456db879a29Richard Smith 339734b41d939a1328f484511c6002ba2456db879a29Richard Smith SourceLocation Loc = Init->getExprLoc(); 339834b41d939a1328f484511c6002ba2456db879a29Richard Smith 339934b41d939a1328f484511c6002ba2456db879a29Richard Smith LocalInstantiationScope InstScope(*this); 340034b41d939a1328f484511c6002ba2456db879a29Richard Smith 340134b41d939a1328f484511c6002ba2456db879a29Richard Smith // Build template<class TemplParam> void Func(FuncParam); 34024fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth TemplateTypeParmDecl *TemplParam = 34034fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth TemplateTypeParmDecl::Create(Context, 0, SourceLocation(), Loc, 0, 0, 0, 34044fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth false, false); 34054fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth QualType TemplArg = QualType(TemplParam->getTypeForDecl(), 0); 34064fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth NamedDecl *TemplParamPtr = TemplParam; 3407483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith FixedSizeTemplateParameterList<1> TemplateParams(Loc, Loc, &TemplParamPtr, 3408483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith Loc); 3409483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith 3410a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith TypeSourceInfo *FuncParamInfo = 341134b41d939a1328f484511c6002ba2456db879a29Richard Smith SubstituteAutoTransform(*this, TemplArg).TransformType(Type); 3412a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith assert(FuncParamInfo && "substituting template parameter for 'auto' failed"); 3413a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith QualType FuncParam = FuncParamInfo->getType(); 341434b41d939a1328f484511c6002ba2456db879a29Richard Smith 341534b41d939a1328f484511c6002ba2456db879a29Richard Smith // Deduce type of TemplParam in Func(Init) 34165f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 1> Deduced; 341734b41d939a1328f484511c6002ba2456db879a29Richard Smith Deduced.resize(1); 341834b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType InitType = Init->getType(); 341934b41d939a1328f484511c6002ba2456db879a29Richard Smith unsigned TDF = 0; 3420483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith if (AdjustFunctionParmAndArgTypesForDeduction(*this, &TemplateParams, 342134b41d939a1328f484511c6002ba2456db879a29Richard Smith FuncParam, InitType, Init, 342234b41d939a1328f484511c6002ba2456db879a29Richard Smith TDF)) 342334b41d939a1328f484511c6002ba2456db879a29Richard Smith return false; 342434b41d939a1328f484511c6002ba2456db879a29Richard Smith 342534b41d939a1328f484511c6002ba2456db879a29Richard Smith TemplateDeductionInfo Info(Context, Loc); 342662b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 342762b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl InitListExpr * InitList = dyn_cast<InitListExpr>(Init); 342862b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (InitList) { 342962b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl for (unsigned i = 0, e = InitList->getNumInits(); i < e; ++i) { 343062b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (DeduceTemplateArgumentsByTypeMatch(*this, &TemplateParams, FuncParam, 343162b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl InitList->getInit(i)->getType(), 343262b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl Info, Deduced, TDF)) 343362b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl return false; 343462b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl } 343562b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl } else { 343662b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (DeduceTemplateArgumentsByTypeMatch(*this, &TemplateParams, FuncParam, 343762b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl InitType, Info, Deduced, TDF)) 343862b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl return false; 343962b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl } 344034b41d939a1328f484511c6002ba2456db879a29Richard Smith 344134b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType DeducedType = Deduced[0].getAsType(); 344234b41d939a1328f484511c6002ba2456db879a29Richard Smith if (DeducedType.isNull()) 344334b41d939a1328f484511c6002ba2456db879a29Richard Smith return false; 344462b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 344562b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (InitList) { 344662b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl DeducedType = BuildStdInitializerList(DeducedType, Loc); 344762b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (DeducedType.isNull()) 344862b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl return false; 344962b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl } 345062b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 345134b41d939a1328f484511c6002ba2456db879a29Richard Smith Result = SubstituteAutoTransform(*this, DeducedType).TransformType(Type); 345262b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 34539a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor // Check that the deduced argument type is compatible with the original 34549a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor // argument type per C++ [temp.deduct.call]p4. 345562b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (!InitList && Result && 34569a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor CheckOriginalCallArgDeduction(*this, 34579a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor Sema::OriginalCallArg(FuncParam,0,InitType), 34589a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor Result->getType())) { 34599a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor Result = 0; 34609a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor return false; 34619a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor } 34629a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor 346334b41d939a1328f484511c6002ba2456db879a29Richard Smith return true; 346434b41d939a1328f484511c6002ba2456db879a29Richard Smith} 346534b41d939a1328f484511c6002ba2456db879a29Richard Smith 346662b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redlvoid Sema::DiagnoseAutoDeductionFailure(VarDecl *VDecl, Expr *Init) { 346762b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl if (isa<InitListExpr>(Init)) 346862b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl Diag(VDecl->getLocation(), 346962b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl diag::err_auto_var_deduction_failure_from_init_list) 347062b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl << VDecl->getDeclName() << VDecl->getType() << Init->getSourceRange(); 347162b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl else 347262b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 347362b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl << VDecl->getDeclName() << VDecl->getType() << Init->getType() 347462b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl << Init->getSourceRange(); 347562b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl} 347662b7cfb73e202051e7ab0dad42ba213acd0dec7eSebastian Redl 34778a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregorstatic void 34786fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, QualType T, 3479e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3480ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Level, 34815f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Deduced); 3482dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3483dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief If this is a non-static member function, 348477bc572138543ef97ebec137522b763d6a6ee909Douglas Gregorstatic void MaybeAddImplicitObjectParameterType(ASTContext &Context, 348577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor CXXMethodDecl *Method, 34865f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<QualType> &ArgTypes) { 348777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor if (Method->isStatic()) 348877bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor return; 348977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 349077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // C++ [over.match.funcs]p4: 349177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // 349277bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // For non-static member functions, the type of the implicit 349377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // object parameter is 34940099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - "lvalue reference to cv X" for functions declared without a 349577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // ref-qualifier or with the & ref-qualifier 349677bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // - "rvalue reference to cv X" for functions declared with the 349777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // && ref-qualifier 349877bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // 349977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // FIXME: We don't have ref-qualifiers yet, so we don't do that part. 350077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor QualType ArgTy = Context.getTypeDeclType(Method->getParent()); 350177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTy = Context.getQualifiedType(ArgTy, 350277bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor Qualifiers::fromCVRMask(Method->getTypeQualifiers())); 350377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTy = Context.getLValueReferenceType(ArgTy); 350477bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTypes.push_back(ArgTy); 350577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor} 350677bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 35078a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// \brief Determine whether the function template \p FT1 is at least as 35088a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// specialized as \p FT2. 35098a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregorstatic bool isAtLeastAsSpecializedAs(Sema &S, 35105769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc, 35118a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionTemplateDecl *FT1, 35128a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionTemplateDecl *FT2, 35138a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor TemplatePartialOrderingContext TPOC, 3514dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned NumCallArguments, 35155f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<RefParamPartialOrderingComparison> *RefParamComparisons) { 35168a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionDecl *FD1 = FT1->getTemplatedDecl(); 3517dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionDecl *FD2 = FT2->getTemplatedDecl(); 35188a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor const FunctionProtoType *Proto1 = FD1->getType()->getAs<FunctionProtoType>(); 35198a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor const FunctionProtoType *Proto2 = FD2->getType()->getAs<FunctionProtoType>(); 3520dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35218a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor assert(Proto1 && Proto2 && "Function templates must have prototypes"); 35228a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor TemplateParameterList *TemplateParams = FT2->getTemplateParameters(); 35235f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 35248a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Deduced.resize(TemplateParams->size()); 35258a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 35268a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p3: 35278a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // The types used to determine the ordering depend on the context in which 35288a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // the partial ordering is done: 35292a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(S.Context, Loc); 35308d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor CXXMethodDecl *Method1 = 0; 35318d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor CXXMethodDecl *Method2 = 0; 35328d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor bool IsNonStatic2 = false; 35338d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor bool IsNonStatic1 = false; 35348d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor unsigned Skip2 = 0; 35358a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor switch (TPOC) { 35368a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Call: { 35378a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // - In the context of a function call, the function parameter types are 35388a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // used. 35398d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Method1 = dyn_cast<CXXMethodDecl>(FD1); 35408d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Method2 = dyn_cast<CXXMethodDecl>(FD2); 35418d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic1 = Method1 && !Method1->isStatic(); 35428d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic2 = Method2 && !Method2->isStatic(); 35438d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor 35448d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // C++0x [temp.func.order]p3: 35458d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // [...] If only one of the function templates is a non-static 35468d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // member, that function template is considered to have a new 35478d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // first parameter inserted in its function parameter list. The 35488d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // new parameter is of type "reference to cv A," where cv are 35498d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // the cv-qualifiers of the function template (if any) and A is 35508d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // the class of which the function template is a member. 35518d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // 35528d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // C++98/03 doesn't have this provision, so instead we drop the 35538d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // first argument of the free function or static member, which 35548d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // seems to match existing practice. 35555f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> Args1; 3556dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned Skip1 = !S.getLangOptions().CPlusPlus0x && 35578d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic2 && !IsNonStatic1; 35588d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor if (S.getLangOptions().CPlusPlus0x && IsNonStatic1 && !IsNonStatic2) 3559dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MaybeAddImplicitObjectParameterType(S.Context, Method1, Args1); 3560dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Args1.insert(Args1.end(), 35618d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Proto1->arg_type_begin() + Skip1, Proto1->arg_type_end()); 356277bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 35635f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> Args2; 3564dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Skip2 = !S.getLangOptions().CPlusPlus0x && 35658d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic1 && !IsNonStatic2; 35668d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor if (S.getLangOptions().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) 356777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor MaybeAddImplicitObjectParameterType(S.Context, Method2, Args2); 3568dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Args2.insert(Args2.end(), 35698d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Proto2->arg_type_begin() + Skip2, Proto2->arg_type_end()); 3570dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35715c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++ [temp.func.order]p5: 35725c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // The presence of unused ellipsis and default arguments has no effect on 35735c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // the partial ordering of function templates. 35745c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (Args1.size() > NumCallArguments) 35755c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args1.resize(NumCallArguments); 35765c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (Args2.size() > NumCallArguments) 35775c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args2.resize(NumCallArguments); 35785c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (DeduceTemplateArguments(S, TemplateParams, Args2.data(), Args2.size(), 35795c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args1.data(), Args1.size(), Info, Deduced, 35805c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TDF_None, /*PartialOrdering=*/true, 3581b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons)) 35828a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 3583dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35848a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 35858a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3586dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35878a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Conversion: 35888a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // - In the context of a call to a conversion operator, the return types 35898a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // of the conversion function templates are used. 3590bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl if (DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 3591bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Proto2->getResultType(), 3592bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Proto1->getResultType(), 3593bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF_None, 3594bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl /*PartialOrdering=*/true, 3595bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons)) 35968a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 35978a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 3598dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35998a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Other: 36000099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - In other contexts (14.6.6.2) the function template's function type 36018a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // is used. 3602bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl if (DeduceTemplateArgumentsByTypeMatch(S, TemplateParams, 3603bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl FD2->getType(), FD1->getType(), 3604bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl Info, Deduced, TDF_None, 3605bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl /*PartialOrdering=*/true, 3606bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl RefParamComparisons)) 36078a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 36088a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 36098a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3610dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36118a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p11: 3612dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // In most cases, all template parameters must have values in order for 3613dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // deduction to succeed, but for partial ordering purposes a template 3614dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter may remain without a value provided it is not used in the 36158a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // types being used for partial ordering. [ Note: a template parameter used 36168a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // in a non-deduced context is considered used. -end note] 36178a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor unsigned ArgIdx = 0, NumArgs = Deduced.size(); 36188a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor for (; ArgIdx != NumArgs; ++ArgIdx) 36198a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Deduced[ArgIdx].isNull()) 36208a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 36218a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 36228a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (ArgIdx == NumArgs) { 3623dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // All template arguments were deduced. FT1 is at least as specialized 36248a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // as FT2. 36258a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return true; 36268a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 36278a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 3628e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // Figure out which template parameters were used. 36295f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<bool, 4> UsedParameters; 36308a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor UsedParameters.resize(TemplateParams->size()); 36318a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor switch (TPOC) { 36328a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Call: { 3633dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned NumParams = std::min(NumCallArguments, 3634dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi std::min(Proto1->getNumArgs(), 36355c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Proto2->getNumArgs())); 36368d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor if (S.getLangOptions().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) 36376fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, Method2->getThisType(S.Context), 36386fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis false, 36398d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor TemplateParams->getDepth(), UsedParameters); 36408d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor for (unsigned I = Skip2; I < NumParams; ++I) 36416fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, Proto2->getArgType(I), false, 3642ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3643e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor UsedParameters); 36448a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 36458a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3646dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36478a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Conversion: 36486fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, Proto2->getResultType(), false, 3649ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3650e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor UsedParameters); 36518a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 3652dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36538a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Other: 36546fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, FD2->getType(), false, 3655ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3656ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor UsedParameters); 36578a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 36588a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3659dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36608a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor for (; ArgIdx != NumArgs; ++ArgIdx) 36618a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // If this argument had no value deduced but was used in one of the types 36628a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // used for partial ordering, then deduction fails. 36638a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Deduced[ArgIdx].isNull() && UsedParameters[ArgIdx]) 36648a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 3665dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36668a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return true; 36678a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor} 3668dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36699da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor/// \brief Determine whether this a function template whose parameter-type-list 36709da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor/// ends with a function parameter pack. 36719da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregorstatic bool isVariadicFunctionTemplate(FunctionTemplateDecl *FunTmpl) { 36729da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor FunctionDecl *Function = FunTmpl->getTemplatedDecl(); 36739da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor unsigned NumParams = Function->getNumParams(); 36749da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (NumParams == 0) 36759da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 3676dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36779da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor ParmVarDecl *Last = Function->getParamDecl(NumParams - 1); 36789da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (!Last->isParameterPack()) 36799da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 3680dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36819da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // Make sure that no previous parameter is a parameter pack. 36829da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor while (--NumParams > 0) { 36839da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (Function->getParamDecl(NumParams - 1)->isParameterPack()) 36849da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 36859da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor } 3686dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36879da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return true; 36889da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor} 3689dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3690bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \brief Returns the more specialized function template according 369165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// to the rules of function template partial ordering (C++ [temp.func.order]). 369265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 369365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \param FT1 the first function template 369465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 369565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \param FT2 the second function template 369665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 36978a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// \param TPOC the context in which we are performing partial ordering of 36988a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// function templates. 36991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// 37005c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param NumCallArguments The number of arguments in a call, used only 37015c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// when \c TPOC is \c TPOC_Call. 37025c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 3703bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \returns the more specialized function template. If neither 370465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// template is more specialized, returns NULL. 370565ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorFunctionTemplateDecl * 370665ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::getMoreSpecializedTemplate(FunctionTemplateDecl *FT1, 370765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor FunctionTemplateDecl *FT2, 37085769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc, 37095c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TemplatePartialOrderingContext TPOC, 37105c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned NumCallArguments) { 37115f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<RefParamPartialOrderingComparison, 4> RefParamComparisons; 3712dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi bool Better1 = isAtLeastAsSpecializedAs(*this, Loc, FT1, FT2, TPOC, 37135c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor NumCallArguments, 0); 3714dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi bool Better2 = isAtLeastAsSpecializedAs(*this, Loc, FT2, FT1, TPOC, 37155c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor NumCallArguments, 3716b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor &RefParamComparisons); 3717dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37188a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Better1 != Better2) // We have a clear winner 37198a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return Better1? FT1 : FT2; 3720dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37218a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (!Better1 && !Better2) // Neither is better than the other 372265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return 0; 37238a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 37248a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p10: 3725dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If for each type being considered a given template is at least as 37268a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized for all types and more specialized for some set of types and 3727dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the other template is not more specialized for any types or is not at 37288a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // least as specialized for any types, then the given template is more 37298a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized than the other template. Otherwise, neither template is more 37308a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized than the other. 37318a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Better1 = false; 37328a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Better2 = false; 3733b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor for (unsigned I = 0, N = RefParamComparisons.size(); I != N; ++I) { 37348a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p9: 37358a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // If, for a given type, deduction succeeds in both directions (i.e., the 3736b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // types are identical after the transformations above) and both P and A 3737b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // were reference types (before being replaced with the type referred to 3738b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // above): 3739b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 3740dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // -- if the type from the argument template was an lvalue reference 3741b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // and the type from the parameter template was not, the argument 3742b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // type is considered to be more specialized than the other; 3743b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // otherwise, 3744b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (!RefParamComparisons[I].ArgIsRvalueRef && 3745b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons[I].ParamIsRvalueRef) { 3746b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better2 = true; 3747b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better1) 3748b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3749b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3750b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor } else if (!RefParamComparisons[I].ParamIsRvalueRef && 3751b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons[I].ArgIsRvalueRef) { 3752b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better1 = true; 3753b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better2) 3754b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3755b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3756b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor } 3757dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3758b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // -- if the type from the argument template is more cv-qualified than 3759b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // the type from the parameter template (as described above), the 3760b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // argument type is considered to be more specialized than the 3761b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // other; otherwise, 3762b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor switch (RefParamComparisons[I].Qualifiers) { 3763b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case NeitherMoreQualified: 3764b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor break; 3765dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3766b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case ParamMoreQualified: 3767b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better1 = true; 3768b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better2) 3769b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3770b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3771dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3772b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case ArgMoreQualified: 3773b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better2 = true; 3774b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better1) 3775b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3776b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 37778a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3778dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3779b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // -- neither type is more specialized than the other. 37808a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3781dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37828a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor assert(!(Better1 && Better2) && "Should have broken out in the loop above"); 378365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (Better1) 378465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return FT1; 37858a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor else if (Better2) 37868a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return FT2; 3787dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37889da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // FIXME: This mimics what GCC implements, but doesn't match up with the 37899da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // proposed resolution for core issue 692. This area needs to be sorted out, 37909da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // but for now we attempt to maintain compatibility. 37919da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor bool Variadic1 = isVariadicFunctionTemplate(FT1); 37929da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor bool Variadic2 = isVariadicFunctionTemplate(FT2); 37939da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (Variadic1 != Variadic2) 37949da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return Variadic1? FT2 : FT1; 3795dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37969da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return 0; 379765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor} 379883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 3799d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \brief Determine if the two templates are equivalent. 3800d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregorstatic bool isSameTemplate(TemplateDecl *T1, TemplateDecl *T2) { 3801d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (T1 == T2) 3802d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return true; 3803dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3804d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (!T1 || !T2) 3805d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return false; 3806dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3807d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return T1->getCanonicalDecl() == T2->getCanonicalDecl(); 3808d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor} 3809d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor 3810d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \brief Retrieve the most specialized of the given function template 3811d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specializations. 3812d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3813c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// \param SpecBegin the start iterator of the function template 3814c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// specializations that we will be comparing. 3815d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3816c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// \param SpecEnd the end iterator of the function template 3817c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// specializations, paired with \p SpecBegin. 3818d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3819d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param TPOC the partial ordering context to use to compare the function 3820d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// template specializations. 3821d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 38225c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param NumCallArguments The number of arguments in a call, used only 38235c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// when \c TPOC is \c TPOC_Call. 38245c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 3825dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param Loc the location where the ambiguity or no-specializations 3826d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// diagnostic should occur. 3827d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3828d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param NoneDiag partial diagnostic used to diagnose cases where there are 3829d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// no matching candidates. 3830d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3831d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param AmbigDiag partial diagnostic used to diagnose an ambiguity, if one 3832d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// occurs. 3833d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3834d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param CandidateDiag partial diagnostic used for each function template 3835d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specialization that is a candidate in the ambiguous ordering. One parameter 3836d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// in this diagnostic should be unbound, which will correspond to the string 3837d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// describing the template arguments for the function template specialization. 3838d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3839dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param Index if non-NULL and the result of this function is non-nULL, 3840d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// receives the index corresponding to the resulting function template 3841d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specialization. 3842d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3843dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \returns the most specialized function template specialization, if 3844c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// found. Otherwise, returns SpecEnd. 3845d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3846dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \todo FIXME: Consider passing in the "also-ran" candidates that failed 3847d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// template argument deduction. 3848c373d48502ca7683ab55385f5bd624d778eb288dJohn McCallUnresolvedSetIterator 3849c373d48502ca7683ab55385f5bd624d778eb288dJohn McCallSema::getMostSpecialized(UnresolvedSetIterator SpecBegin, 38505c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor UnresolvedSetIterator SpecEnd, 3851c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall TemplatePartialOrderingContext TPOC, 38525c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned NumCallArguments, 3853c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall SourceLocation Loc, 3854c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall const PartialDiagnostic &NoneDiag, 3855c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall const PartialDiagnostic &AmbigDiag, 38561be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor const PartialDiagnostic &CandidateDiag, 38576efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu bool Complain, 38586efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu QualType TargetType) { 3859c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall if (SpecBegin == SpecEnd) { 38601be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 38611be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag(Loc, NoneDiag); 3862c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecEnd; 3863d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3864dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3865dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (SpecBegin + 1 == SpecEnd) 3866c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecBegin; 3867dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3868d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Find the function template that is better than all of the templates it 3869d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // has been compared to. 3870c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall UnresolvedSetIterator Best = SpecBegin; 3871dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionTemplateDecl *BestTemplate 3872c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*Best)->getPrimaryTemplate(); 3873d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor assert(BestTemplate && "Not a function template specialization?"); 3874c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall for (UnresolvedSetIterator I = SpecBegin + 1; I != SpecEnd; ++I) { 3875c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall FunctionTemplateDecl *Challenger 3876c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*I)->getPrimaryTemplate(); 3877d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor assert(Challenger && "Not a function template specialization?"); 3878c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall if (isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, 38795c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Loc, TPOC, NumCallArguments), 3880d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Challenger)) { 3881d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Best = I; 3882d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor BestTemplate = Challenger; 3883d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3884d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3885dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3886d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Make sure that the "best" function template is more specialized than all 3887d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // of the others. 3888d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor bool Ambiguous = false; 3889c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { 3890c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall FunctionTemplateDecl *Challenger 3891c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*I)->getPrimaryTemplate(); 3892d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (I != Best && 3893dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi !isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, 38945c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Loc, TPOC, NumCallArguments), 3895d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor BestTemplate)) { 3896d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Ambiguous = true; 3897d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor break; 3898d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3899d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3900dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3901d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (!Ambiguous) { 3902d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // We found an answer. Return it. 3903c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return Best; 3904d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3905dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3906d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Diagnose the ambiguity. 39071be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 39081be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag(Loc, AmbigDiag); 3909dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 39101be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 3911d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // FIXME: Can we order the candidates in some sane way? 39126efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { 39136efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu PartialDiagnostic PD = CandidateDiag; 39146efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu PD << getTemplateArgumentBindingsText( 39151be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor cast<FunctionDecl>(*I)->getPrimaryTemplate()->getTemplateParameters(), 3916c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall *cast<FunctionDecl>(*I)->getTemplateSpecializationArgs()); 39176efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu if (!TargetType.isNull()) 39186efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu HandleFunctionTypeMismatch(PD, cast<FunctionDecl>(*I)->getType(), 39196efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu TargetType); 39206efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu Diag((*I)->getLocation(), PD); 39216efd4c55a1a481d92966a91141c03e8145234cf6Richard Trieu } 3922dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3923c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecEnd; 3924d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor} 3925d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor 3926bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \brief Returns the more specialized class template partial specialization 3927bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// according to the rules of partial ordering of class template partial 3928bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// specializations (C++ [temp.class.order]). 3929bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 3930bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \param PS1 the first class template partial specialization 3931bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 3932bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \param PS2 the second class template partial specialization 3933bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 3934bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \returns the more specialized class template partial specialization. If 3935bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// neither partial specialization is more specialized, returns NULL. 3936bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas GregorClassTemplatePartialSpecializationDecl * 3937bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas GregorSema::getMoreSpecializedPartialSpecialization( 3938bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor ClassTemplatePartialSpecializationDecl *PS1, 39395769d6195087229770d7ac90449443e026c47103John McCall ClassTemplatePartialSpecializationDecl *PS2, 39405769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc) { 3941bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // C++ [temp.class.order]p1: 3942bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // For two class template partial specializations, the first is at least as 3943dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // specialized as the second if, given the following rewrite to two 3944dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // function templates, the first function template is at least as 3945dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // specialized as the second according to the ordering rules for function 3946bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // templates (14.6.6.2): 3947bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // - the first function template has the same template parameters as the 3948dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // first partial specialization and has a single function parameter 3949dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // whose type is a class template specialization with the template 3950bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // arguments of the first partial specialization, and 3951bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // - the second function template has the same template parameters as the 3952dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // second partial specialization and has a single function parameter 3953dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // whose type is a class template specialization with the template 3954bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // arguments of the second partial specialization. 3955bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // 395631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // Rather than synthesize function templates, we merely perform the 395731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // equivalent partial ordering by performing deduction directly on 395831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // the template arguments of the class template partial 395931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // specializations. This computation is slightly simpler than the 396031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // general problem of function template partial ordering, because 396131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // class template partial specializations are more constrained. We 396231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // know that every template parameter is deducible from the class 396331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // template partial specialization's template arguments, for 396431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // example. 39655f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 39662a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(Context, Loc); 396731f17ecbef57b5679c017c375db330546b7b5145John McCall 396831f17ecbef57b5679c017c375db330546b7b5145John McCall QualType PT1 = PS1->getInjectedSpecializationType(); 396931f17ecbef57b5679c017c375db330546b7b5145John McCall QualType PT2 = PS2->getInjectedSpecializationType(); 3970dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3971bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // Determine whether PS1 is at least as specialized as PS2 3972bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor Deduced.resize(PS2->getTemplateParameters()->size()); 3973bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl bool Better1 = !DeduceTemplateArgumentsByTypeMatch(*this, 3974bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl PS2->getTemplateParameters(), 39755c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PT2, PT1, Info, Deduced, TDF_None, 3976dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi /*PartialOrdering=*/true, 3977b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*RefParamComparisons=*/0); 39782c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis if (Better1) { 39792c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis InstantiatingTemplate Inst(*this, PS2->getLocation(), PS2, 39802c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis Deduced.data(), Deduced.size(), Info); 3981dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Better1 = !::FinishTemplateArgumentDeduction(*this, PS2, 3982dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PS1->getTemplateArgs(), 3983516e6e09821a61e8975c787e189949723249e7c5Douglas Gregor Deduced, Info); 39842c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis } 3985dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3986bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // Determine whether PS2 is at least as specialized as PS1 3987db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Deduced.clear(); 3988bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor Deduced.resize(PS1->getTemplateParameters()->size()); 3989bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl bool Better2 = !DeduceTemplateArgumentsByTypeMatch(*this, 3990bb95e51a3668c50133b989467cd44ba4d8a42e8aSebastian Redl PS1->getTemplateParameters(), 39915c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PT1, PT2, Info, Deduced, TDF_None, 39925c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor /*PartialOrdering=*/true, 3993b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*RefParamComparisons=*/0); 39942c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis if (Better2) { 39952c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis InstantiatingTemplate Inst(*this, PS1->getLocation(), PS1, 39962c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis Deduced.data(), Deduced.size(), Info); 3997dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Better2 = !::FinishTemplateArgumentDeduction(*this, PS1, 3998dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PS2->getTemplateArgs(), 3999516e6e09821a61e8975c787e189949723249e7c5Douglas Gregor Deduced, Info); 40002c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis } 4001dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4002bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor if (Better1 == Better2) 4003bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor return 0; 4004dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4005bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor return Better1? PS1 : PS2; 4006bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor} 4007bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor 40081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 40096fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4010e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const TemplateArgument &TemplateArg, 4011e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4012ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 40135f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used); 4014031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4015e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 4016031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// expression. 40171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 40186fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4019e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const Expr *E, 4020e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4021ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 40225f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 4023be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor // We can deduce from a pack expansion. 4024be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor if (const PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(E)) 4025be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor E = Expansion->getPattern(); 4026dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 402754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Skip through any implicit casts we added while type-checking. 402854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 402954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor E = ICE->getSubExpr(); 4030dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4031dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // FIXME: if !OnlyDeduced, we have to walk the whole subexpression to 4032e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // find other occurrences of template parameters. 4033f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E); 4034c781f9cd854f3d5d1c826f4a13382c6abca4cff7Douglas Gregor if (!DRE) 4035031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 4036031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 40371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const NonTypeTemplateParmDecl *NTTP 4038031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor = dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); 4039031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor if (!NTTP) 4040031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 4041031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4042ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (NTTP->getDepth() == Depth) 4043ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[NTTP->getIndex()] = true; 4044031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 4045031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4046e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 4047e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// nested name specifier. 4048e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregorstatic void 40496fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4050e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor NestedNameSpecifier *NNS, 4051e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4052ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 40535f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 4054e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!NNS) 4055e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 4056dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 40576fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, NNS->getPrefix(), OnlyDeduced, Depth, 4058ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used); 40596fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, QualType(NNS->getAsType(), 0), 4060ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4061e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor} 4062dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4063e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 4064e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// template name. 4065e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregorstatic void 40666fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4067e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor TemplateName Name, 4068e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4069ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 40705f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 4071e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (TemplateDecl *Template = Name.getAsTemplateDecl()) { 4072e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (TemplateTemplateParmDecl *TTP 4073ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor = dyn_cast<TemplateTemplateParmDecl>(Template)) { 4074ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (TTP->getDepth() == Depth) 4075ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[TTP->getIndex()] = true; 4076ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor } 4077e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 4078e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor } 4079dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4080788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (QualifiedTemplateName *QTN = Name.getAsQualifiedTemplateName()) 40816fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, QTN->getQualifier(), OnlyDeduced, 4082788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Depth, Used); 4083e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) 40846fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, DTN->getQualifier(), OnlyDeduced, 4085ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4086e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor} 4087e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor 4088e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 4089031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// type. 40901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 40916fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, QualType T, 4092e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4093ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 40945f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 4095e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (T.isNull()) 4096e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 4097dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4098031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor // Non-dependent types have nothing deducible 4099031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor if (!T->isDependentType()) 4100031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 4101031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 41026fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis T = Ctx.getCanonicalType(T); 4103031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor switch (T->getTypeClass()) { 4104031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Pointer: 41056fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4106e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<PointerType>(T)->getPointeeType(), 4107e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 4108ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 4109e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 4110031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4111031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4112031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::BlockPointer: 41136fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4114e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<BlockPointerType>(T)->getPointeeType(), 4115e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 4116ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 4117e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 4118031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4119031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4120031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::LValueReference: 4121031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::RValueReference: 41226fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4123e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ReferenceType>(T)->getPointeeType(), 4124e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 4125ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 4126e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 4127031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4128031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4129031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::MemberPointer: { 4130031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor const MemberPointerType *MemPtr = cast<MemberPointerType>(T.getTypePtr()); 41316fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, MemPtr->getPointeeType(), OnlyDeduced, 4132ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 41336fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, QualType(MemPtr->getClass(), 0), 4134ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4135031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4136031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4137031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4138031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::DependentSizedArray: 41396fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4140e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<DependentSizedArrayType>(T)->getSizeExpr(), 4141ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4142031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor // Fall through to check the element type 4143031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4144031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ConstantArray: 4145031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::IncompleteArray: 41466fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4147e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ArrayType>(T)->getElementType(), 4148ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4149031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4150031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4151031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Vector: 4152031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ExtVector: 41536fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4154e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<VectorType>(T)->getElementType(), 4155ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4156031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4157031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 41589cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor case Type::DependentSizedExtVector: { 41599cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor const DependentSizedExtVectorType *VecType 4160f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor = cast<DependentSizedExtVectorType>(T); 41616fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, VecType->getElementType(), OnlyDeduced, 4162ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 41636fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, VecType->getSizeExpr(), OnlyDeduced, 4164ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 41659cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor break; 41669cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor } 41679cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor 4168031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::FunctionProto: { 4169f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor const FunctionProtoType *Proto = cast<FunctionProtoType>(T); 41706fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Proto->getResultType(), OnlyDeduced, 4171ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4172031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor for (unsigned I = 0, N = Proto->getNumArgs(); I != N; ++I) 41736fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Proto->getArgType(I), OnlyDeduced, 4174ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4175031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4176031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4177031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4178ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor case Type::TemplateTypeParm: { 4179ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor const TemplateTypeParmType *TTP = cast<TemplateTypeParmType>(T); 4180ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (TTP->getDepth() == Depth) 4181ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[TTP->getIndex()] = true; 4182031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4183ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor } 4184031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 41850bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor case Type::SubstTemplateTypeParmPack: { 41860bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor const SubstTemplateTypeParmPackType *Subst 41870bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor = cast<SubstTemplateTypeParmPackType>(T); 41886fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 41890bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor QualType(Subst->getReplacedParameter(), 0), 41900bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor OnlyDeduced, Depth, Used); 41916fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Subst->getArgumentPack(), 41920bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor OnlyDeduced, Depth, Used); 41930bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor break; 41940bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor } 41950bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor 419631f17ecbef57b5679c017c375db330546b7b5145John McCall case Type::InjectedClassName: 419731f17ecbef57b5679c017c375db330546b7b5145John McCall T = cast<InjectedClassNameType>(T)->getInjectedSpecializationType(); 419831f17ecbef57b5679c017c375db330546b7b5145John McCall // fall through 419931f17ecbef57b5679c017c375db330546b7b5145John McCall 4200031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::TemplateSpecialization: { 42011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const TemplateSpecializationType *Spec 4202f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor = cast<TemplateSpecializationType>(T); 42036fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Spec->getTemplateName(), OnlyDeduced, 4204ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4205dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 42067b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 4207dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 4208dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 42097b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 4210dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 42117b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) 42127b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor break; 42137b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 4214e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) 42156fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Spec->getArg(I), OnlyDeduced, Depth, 4216ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used); 4217e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor break; 4218e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor } 42191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4220e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor case Type::Complex: 4221e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!OnlyDeduced) 42226fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4223e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ComplexType>(T)->getElementType(), 4224ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4225e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor break; 4226031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4227b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman case Type::Atomic: 4228b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman if (!OnlyDeduced) 42296fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4230b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman cast<AtomicType>(T)->getValueType(), 4231b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman OnlyDeduced, Depth, Used); 4232b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman break; 4233b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 42344714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor case Type::DependentName: 4235e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!OnlyDeduced) 42366fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 42374714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor cast<DependentNameType>(T)->getQualifier(), 4238ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4239031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4240031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 424133500955d731c73717af52088b7fc0e7a85681e7John McCall case Type::DependentTemplateSpecialization: { 424233500955d731c73717af52088b7fc0e7a85681e7John McCall const DependentTemplateSpecializationType *Spec 424333500955d731c73717af52088b7fc0e7a85681e7John McCall = cast<DependentTemplateSpecializationType>(T); 424433500955d731c73717af52088b7fc0e7a85681e7John McCall if (!OnlyDeduced) 42456fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Spec->getQualifier(), 424633500955d731c73717af52088b7fc0e7a85681e7John McCall OnlyDeduced, Depth, Used); 4247dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 42487b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 4249dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 4250dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 42517b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 4252dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 42537b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) 42547b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor break; 42557b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 425633500955d731c73717af52088b7fc0e7a85681e7John McCall for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) 42576fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, Spec->getArg(I), OnlyDeduced, Depth, 425833500955d731c73717af52088b7fc0e7a85681e7John McCall Used); 425933500955d731c73717af52088b7fc0e7a85681e7John McCall break; 426033500955d731c73717af52088b7fc0e7a85681e7John McCall } 426133500955d731c73717af52088b7fc0e7a85681e7John McCall 4262ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::TypeOf: 4263ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 42646fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4265ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<TypeOfType>(T)->getUnderlyingType(), 4266ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 4267ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 4268ad5e73887052193afda72db8efcb812bd083a4a8John McCall 4269ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::TypeOfExpr: 4270ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 42716fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4272ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<TypeOfExprType>(T)->getUnderlyingExpr(), 4273ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 4274ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 4275ad5e73887052193afda72db8efcb812bd083a4a8John McCall 4276ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::Decltype: 4277ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 42786fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4279ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<DecltypeType>(T)->getUnderlyingExpr(), 4280ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 4281ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 4282ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt 4283ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt case Type::UnaryTransform: 4284ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt if (!OnlyDeduced) 42856fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4286ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt cast<UnaryTransformType>(T)->getUnderlyingType(), 4287ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt OnlyDeduced, Depth, Used); 4288ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt break; 4289ad5e73887052193afda72db8efcb812bd083a4a8John McCall 42907536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor case Type::PackExpansion: 42916fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 42927536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor cast<PackExpansionType>(T)->getPattern(), 42937536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor OnlyDeduced, Depth, Used); 42947536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor break; 42957536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor 429634b41d939a1328f484511c6002ba2456db879a29Richard Smith case Type::Auto: 42976fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 429834b41d939a1328f484511c6002ba2456db879a29Richard Smith cast<AutoType>(T)->getDeducedType(), 429934b41d939a1328f484511c6002ba2456db879a29Richard Smith OnlyDeduced, Depth, Used); 430034b41d939a1328f484511c6002ba2456db879a29Richard Smith 4301e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // None of these types have any template parameters in them. 4302031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Builtin: 4303031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::VariableArray: 4304031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::FunctionNoProto: 4305031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Record: 4306031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Enum: 4307031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ObjCInterface: 4308c12c5bba6ceb6acd4e51e7a0fc03257da9cfd44eJohn McCall case Type::ObjCObject: 4309d1b3c2dd5bc1f3103bee6137957aa7c5f8f2f0bcSteve Naroff case Type::ObjCObjectPointer: 4310ed97649e9574b9d854fa4d6109c9333ae0993554John McCall case Type::UnresolvedUsing: 4311031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define TYPE(Class, Base) 4312031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define ABSTRACT_TYPE(Class, Base) 4313031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define DEPENDENT_TYPE(Class, Base) 4314031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4315031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#include "clang/AST/TypeNodes.def" 4316031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4317031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4318031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 4319031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4320e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by this 4321031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// template argument. 43221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 43236fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisMarkUsedTemplateParameters(ASTContext &Ctx, 4324e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const TemplateArgument &TemplateArg, 4325e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4326ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 43275f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 4328031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor switch (TemplateArg.getKind()) { 4329031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Null: 4330031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Integral: 4331788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Declaration: 4332031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 43331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4334031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Type: 43356fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, TemplateArg.getAsType(), OnlyDeduced, 4336ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4337031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4338031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4339788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 4340a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 43416fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, 4342dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArg.getAsTemplateOrTemplatePattern(), 4343788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor OnlyDeduced, Depth, Used); 4344031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4345031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4346031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Expression: 43476fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, TemplateArg.getAsExpr(), OnlyDeduced, 4348ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4349031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4350dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4351d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson case TemplateArgument::Pack: 4352e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor for (TemplateArgument::pack_iterator P = TemplateArg.pack_begin(), 4353e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor PEnd = TemplateArg.pack_end(); 4354e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor P != PEnd; ++P) 43556fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis MarkUsedTemplateParameters(Ctx, *P, OnlyDeduced, Depth, Used); 4356d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson break; 4357031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4358031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 4359031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4360031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \brief Mark the template parameters can be deduced by the given 4361031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// template argument list. 4362031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// 4363031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \param TemplateArgs the template argument list from which template 4364031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// parameters will be deduced. 4365031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// 4366031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \param Deduced a bit vector whose elements will be set to \c true 4367031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// to indicate when the corresponding template parameter will be 4368031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// deduced. 43691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid 4370e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorSema::MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs, 4371ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor bool OnlyDeduced, unsigned Depth, 43725f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 43737b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 4374dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 4375dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 43767b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 4377dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 43787b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(TemplateArgs.data(), TemplateArgs.size())) 43797b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return; 43807b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 4381031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) 43826fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(Context, TemplateArgs[I], OnlyDeduced, 4383ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4384031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 438563f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor 438663f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor/// \brief Marks all of the template parameters that will be deduced by a 438763f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor/// call to the given function template. 4388dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumivoid 43896fc9e1d98205649e4d0f741d194d288a45995a62Argyrios KyrtzidisSema::MarkDeducedTemplateParameters(ASTContext &Ctx, 43906fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis FunctionTemplateDecl *FunctionTemplate, 43915f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Deduced) { 4392dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateParameterList *TemplateParams 439363f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor = FunctionTemplate->getTemplateParameters(); 439463f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor Deduced.clear(); 439563f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor Deduced.resize(TemplateParams->size()); 4396dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 439763f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 439863f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) 43996fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(Ctx, Function->getParamDecl(I)->getType(), 4400ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor true, TemplateParams->getDepth(), Deduced); 440163f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor} 4402dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4403dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregorbool hasDeducibleTemplateParameters(Sema &S, 4404dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor FunctionTemplateDecl *FunctionTemplate, 4405dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType T) { 4406dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (!T->isDependentType()) 4407dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor return false; 4408dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4409dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor TemplateParameterList *TemplateParams 4410dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor = FunctionTemplate->getTemplateParameters(); 44115f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<bool, 4> Deduced; 4412dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor Deduced.resize(TemplateParams->size()); 44136fc9e1d98205649e4d0f741d194d288a45995a62Argyrios Kyrtzidis ::MarkUsedTemplateParameters(S.Context, T, true, TemplateParams->getDepth(), 4414dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor Deduced); 4415dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4416dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor for (unsigned I = 0, N = Deduced.size(); I != N; ++I) 4417dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (Deduced[I]) 4418dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor return true; 4419dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4420dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor return false; 4421dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor} 4422