SemaTemplateDeduction.cpp revision 8735b294a257a07ca158c28094d7324f0adf889a
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" 1520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor#include "clang/Sema/SemaDiagnostic.h" // FIXME: temporary! 167cd088e519d7e6caa4c4c12db52e0e4ae35d25c2John McCall#include "clang/Sema/Template.h" 172a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall#include "clang/Sema/TemplateDeduction.h" 180b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/ASTContext.h" 197cd088e519d7e6caa4c4c12db52e0e4ae35d25c2John McCall#include "clang/AST/DeclObjC.h" 200b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/DeclTemplate.h" 210b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/StmtVisitor.h" 220b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/Expr.h" 230b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/ExprCXX.h" 24e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor#include "llvm/ADT/BitVector.h" 2534b41d939a1328f484511c6002ba2456db879a29Richard Smith#include "TreeTransform.h" 268a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor#include <algorithm> 27508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor 28508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregornamespace clang { 292a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall using namespace sema; 302a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall 31508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Various flags that control template argument deduction. 32508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// 33508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// These flags can be bitwise-OR'd together. 34508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor enum TemplateDeductionFlags { 35508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief No template argument deduction flags, which indicates the 36508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// strictest results for template argument deduction (as used for, e.g., 37508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// matching class template partial specializations). 38508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF_None = 0, 39508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Within template argument deduction from a function call, we are 40508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// matching with a parameter type for which the original parameter was 41508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// a reference. 42508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF_ParamWithReferenceType = 0x1, 43508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Within template argument deduction from a function call, we 44508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// are matching in a case where we ignore cv-qualifiers. 45508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF_IgnoreQualifiers = 0x02, 46508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Within template argument deduction from a function call, 47508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// we are matching in a case where we can perform template argument 484112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor /// deduction from a template-id of a derived class of the argument type. 491282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor TDF_DerivedClass = 0x04, 501282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor /// \brief Allow non-dependent types to differ, e.g., when performing 511282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor /// template argument deduction from a function call where conversions 521282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor /// may apply. 5373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF_SkipNonDependent = 0x08, 5473b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor /// \brief Whether we are performing template argument deduction for 55dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi /// parameters and arguments in a top-level template argument 5673b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF_TopLevelParameterTypeList = 0x10 57508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor }; 58508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor} 59508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor 600b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregorusing namespace clang; 610b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 629d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor/// \brief Compare two APSInts, extending and switching the sign as 639d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor/// necessary to compare their values regardless of underlying type. 649d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregorstatic bool hasSameExtendedValue(llvm::APSInt X, llvm::APSInt Y) { 659d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if (Y.getBitWidth() > X.getBitWidth()) 669f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad X = X.extend(Y.getBitWidth()); 679d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor else if (Y.getBitWidth() < X.getBitWidth()) 689f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Y = Y.extend(X.getBitWidth()); 699d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 709d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor // If there is a signedness mismatch, correct it. 719d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if (X.isSigned() != Y.isSigned()) { 729d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor // If the signed value is negative, then the values cannot be the same. 739d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if ((Y.isSigned() && Y.isNegative()) || (X.isSigned() && X.isNegative())) 749d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor return false; 759d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 769d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor Y.setIsSigned(true); 779d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor X.setIsSigned(true); 789d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor } 799d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 809d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor return X == Y; 819d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor} 829d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 83f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 84a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 85f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 86f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor const TemplateArgument &Param, 8777d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor TemplateArgument Arg, 882a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 890972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced); 90d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 91b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \brief Whether template argument deduction for two reference parameters 92b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// resulted in the argument type, parameter type, or neither type being more 93b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// qualified than the other. 94dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumienum DeductionQualifierComparison { 95dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NeitherMoreQualified = 0, 96dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ParamMoreQualified, 97dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ArgMoreQualified 985c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor}; 995c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor 100b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \brief Stores the result of comparing two reference parameters while 101b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// performing template argument deduction for partial ordering of function 102dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// templates. 103b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregorstruct RefParamPartialOrderingComparison { 104b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /// \brief Whether the parameter type is an rvalue reference type. 105b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor bool ParamIsRvalueRef; 106b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /// \brief Whether the argument type is an rvalue reference type. 107b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor bool ArgIsRvalueRef; 108dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 109b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /// \brief Whether the parameter or argument (or neither) is more qualified. 110b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor DeductionQualifierComparison Qualifiers; 111b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor}; 112b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 113b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 1145c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor 11520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregorstatic Sema::TemplateDeductionResult 11620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas GregorDeduceTemplateArguments(Sema &S, 11720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateParameterList *TemplateParams, 118603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor QualType Param, 119603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor QualType Arg, 120603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateDeductionInfo &Info, 121603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced, 1225c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned TDF, 1235c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool PartialOrdering = false, 124b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor llvm::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, 1330972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor llvm::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, 29202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::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, 32002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::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, 35102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::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, 37602024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::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, 43502024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::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, 550dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced, 5515429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor const llvm::SmallVectorImpl<unsigned> &PackIndices, 552dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi llvm::SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, 5535429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor llvm::SmallVectorImpl< 5545429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor llvm::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, 585dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced, 5860216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor const llvm::SmallVectorImpl<unsigned> &PackIndices, 587dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi llvm::SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, 5880216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor llvm::SmallVectorImpl< 5890216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor llvm::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, 672603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced, 6735c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned TDF, 6745c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool PartialOrdering = false, 675b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor llvm::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 7095c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, 7105c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Params[ParamIdx], 7115c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args[ArgIdx], 7125c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Info, Deduced, TDF, 7135c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PartialOrdering, 714b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons)) 715603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Result; 716dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 717603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor ++ArgIdx; 718603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor continue; 719603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 720dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 7217d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // C++0x [temp.deduct.type]p5: 7227d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // The non-deduced contexts are: 723dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - A function parameter pack that does not occur at the end of the 7247d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // parameter-declaration-clause. 7257d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor if (ParamIdx + 1 < NumParams) 7267d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor return Sema::TDK_Success; 7277d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor 728603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // C++0x [temp.deduct.type]p10: 729dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the parameter-declaration corresponding to Pi is a function 730603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // parameter pack, then the type of its declarator- id is compared with 731dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // each remaining parameter type in the parameter-type-list of A. Each 732603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // comparison deduces template arguments for subsequent positions in the 733603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // template parameter packs expanded by the function parameter pack. 734dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 735603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Compute the set of template parameter indices that correspond to 736603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // parameter packs expanded by the pack expansion. 737603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::SmallVector<unsigned, 2> PackIndices; 738603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor QualType Pattern = Expansion->getPattern(); 739603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor { 740603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::BitVector SawIndices(TemplateParams->size()); 741603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded; 742603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor S.collectUnexpandedParameterPacks(Pattern, Unexpanded); 743603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 744603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor unsigned Depth, Index; 745603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 746603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 747603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor SawIndices[Index] = true; 748603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor PackIndices.push_back(Index); 749603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 750603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 751603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 752603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 753603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 754d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Keep track of the deduced template arguments for each parameter pack 755dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 756d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template argument (the inner SmallVectors). 757d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor llvm::SmallVector<llvm::SmallVector<DeducedTemplateArgument, 4>, 2> 758d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 759dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi llvm::SmallVector<DeducedTemplateArgument, 2> 7605429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor SavedPacks(PackIndices.size()); 761dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, 7625429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks); 763dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 764603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor bool HasAnyArguments = false; 765603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (; ArgIdx < NumArgs; ++ArgIdx) { 766603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor HasAnyArguments = true; 767dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 768603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Deduce template arguments from the pattern. 769dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (Sema::TemplateDeductionResult Result 77073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, Pattern, Args[ArgIdx], 77173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Info, Deduced, TDF, PartialOrdering, 77273b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor 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 82361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // CVR qualifier superset. 82461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return (ParamQs.getCVRQualifiers() != ArgQs.getCVRQualifiers()) && 82561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ((ParamQs.getCVRQualifiers() | ArgQs.getCVRQualifiers()) 82661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor == ParamQs.getCVRQualifiers()); 82761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor} 82861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 829500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \brief Deduce the template arguments by comparing the parameter type and 830500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// the argument type (C++ [temp.deduct.type]). 831500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 832a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth/// \param S the semantic analysis object within which we are deducing 833500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 834500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param TemplateParams the template parameters that we are deducing 835500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 836500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param ParamIn the parameter type 837500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 838500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param ArgIn the argument type 839500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 840500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param Info information about the template argument deduction itself 841500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 842500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param Deduced the deduced template arguments 843500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 844508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor/// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe 8451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// how template argument deduction is performed. 846500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 8475c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param PartialOrdering Whether we're performing template argument deduction 8485c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering (C++0x [temp.deduct.partial]). 8495c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 850b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \param RefParamComparisons If we're performing template argument deduction 8515c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering, the set of qualifier comparisons. 8525c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 853500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \returns the result of template argument deduction so far. Note that a 854500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// "success" result means that template argument deduction has not yet failed, 855500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// but it may still fail, later, for other reasons. 856f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 857a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 858f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 859f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor QualType ParamIn, QualType ArgIn, 8602a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 86102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced, 8625c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned TDF, 8635c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool PartialOrdering, 864b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor llvm::SmallVectorImpl<RefParamPartialOrderingComparison> *RefParamComparisons) { 8650b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // We only want to look at the canonical types, since typedefs and 8660b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // sugar are not part of template argument deduction. 867a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth QualType Param = S.Context.getCanonicalType(ParamIn); 868a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth QualType Arg = S.Context.getCanonicalType(ArgIn); 8690b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 87077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the argument type is a pack expansion, look at its pattern. 871dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // This isn't explicitly called out 87277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (const PackExpansionType *ArgExpansion 87377d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor = dyn_cast<PackExpansionType>(Arg)) 87477d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Arg = ArgExpansion->getPattern(); 875dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 8765c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (PartialOrdering) { 8775c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p5: 878dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Before the partial ordering is done, certain transformations are 879dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // performed on the types used for partial ordering: 880dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If P is a reference type, P is replaced by the type referred to. 8815c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor const ReferenceType *ParamRef = Param->getAs<ReferenceType>(); 8825c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (ParamRef) 8835c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = ParamRef->getPointeeType(); 884dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 8855c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // - If A is a reference type, A is replaced by the type referred to. 8865c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor const ReferenceType *ArgRef = Arg->getAs<ReferenceType>(); 8875c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (ArgRef) 8885c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Arg = ArgRef->getPointeeType(); 889dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 890b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (RefParamComparisons && ParamRef && ArgRef) { 8915c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p6: 892dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If both P and A were reference types (before being replaced with the 893dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // type referred to above), determine which of the two types (if any) is 8945c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // more cv-qualified than the other; otherwise the types are considered 895dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // to be equally cv-qualified for partial ordering purposes. The result 8965c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // of this determination will be used below. 8975c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // 898dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // We save this information for later, using it only when deduction 8995c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // succeeds in both directions. 900b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamPartialOrderingComparison Comparison; 901b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.ParamIsRvalueRef = ParamRef->getAs<RValueReferenceType>(); 902b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.ArgIsRvalueRef = ArgRef->getAs<RValueReferenceType>(); 903b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = NeitherMoreQualified; 904769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor 905769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor Qualifiers ParamQuals = Param.getQualifiers(); 906769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor Qualifiers ArgQuals = Arg.getQualifiers(); 907769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor if (ParamQuals.isStrictSupersetOf(ArgQuals)) 908b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = ParamMoreQualified; 909769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor else if (ArgQuals.isStrictSupersetOf(ParamQuals)) 910b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = ArgMoreQualified; 911b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons->push_back(Comparison); 9125c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } 913dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9145c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p7: 9155c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // Remove any top-level cv-qualifiers: 916dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If P is a cv-qualified type, P is replaced by the cv-unqualified 9175c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // version of P. 9185c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = Param.getUnqualifiedType(); 919dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If A is a cv-qualified type, A is replaced by the cv-unqualified 9205c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // version of A. 9215c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Arg = Arg.getUnqualifiedType(); 9225c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } else { 9235c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.call]p4 bullet 1: 9245c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // - If the original P is a reference type, the deduced A (i.e., the type 9255c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // referred to by the reference) can be more cv-qualified than the 9265c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // transformed A. 9275c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (TDF & TDF_ParamWithReferenceType) { 9285c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Qualifiers Quals; 9295c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor QualType UnqualParam = S.Context.getUnqualifiedArrayType(Param, Quals); 9305c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Quals.setCVRQualifiers(Quals.getCVRQualifiers() & 93162c28c831bbf207cc36e683e7c321fc33bf8928cJohn McCall Arg.getCVRQualifiers()); 9325c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = S.Context.getQualifiedType(UnqualParam, Quals); 9335c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } 934dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 93573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if ((TDF & TDF_TopLevelParameterTypeList) && !Param->isFunctionType()) { 93673b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // C++0x [temp.deduct.type]p10: 93773b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // If P and A are function types that originated from deduction when 93873b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // taking the address of a function template (14.8.2.2) or when deducing 93973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // template arguments from a function declaration (14.8.2.6) and Pi and 940dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Ai are parameters of the top-level parameter-type-list of P and A, 941dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // respectively, Pi is adjusted if it is an rvalue reference to a 942dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // cv-unqualified template parameter and Ai is an lvalue reference, in 943dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // which case the type of Pi is changed to be the template parameter 94473b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // type (i.e., T&& is changed to simply T). [ Note: As a result, when 94573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // Pi is T&& and Ai is X&, the adjusted Pi will be T, causing T to be 9460099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // deduced as X&. - end note ] 94773b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF &= ~TDF_TopLevelParameterTypeList; 948dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 94973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (const RValueReferenceType *ParamRef 95073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor = Param->getAs<RValueReferenceType>()) { 95173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (isa<TemplateTypeParmType>(ParamRef->getPointeeType()) && 95273b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor !ParamRef->getPointeeType().getQualifiers()) 95373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (Arg->isLValueReferenceType()) 95473b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Param = ParamRef->getPointeeType(); 95573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor } 95673b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor } 957500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor } 958dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 959f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor // If the parameter type is not dependent, there is nothing to deduce. 9601282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor if (!Param->isDependentType()) { 9613cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor if (!(TDF & TDF_SkipNonDependent) && Param != Arg) 9621282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor return Sema::TDK_NonDeducedMismatch; 963dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 964f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Sema::TDK_Success; 9651282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor } 9660b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 967199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // C++ [temp.deduct.type]p9: 9681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // A template type argument T, a template template argument TT or a 9691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // template non-type argument i can be deduced if P and A have one of 970199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // the following forms: 971199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // 972199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T 973199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // cv-list T 9741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateTypeParmType *TemplateTypeParm 975183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Param->getAs<TemplateTypeParmType>()) { 976f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor unsigned Index = TemplateTypeParm->getIndex(); 977f290e0db835a619014538c41ed552696efc0e977Douglas Gregor bool RecanonicalizeArg = false; 9781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9799e9fae4b8af47c15696da4ea3c30102e3a035179Douglas Gregor // If the argument type is an array type, move the qualifiers up to the 9809e9fae4b8af47c15696da4ea3c30102e3a035179Douglas Gregor // top level, so they can be matched with the qualifiers on the parameter. 981f290e0db835a619014538c41ed552696efc0e977Douglas Gregor if (isa<ArrayType>(Arg)) { 9820953e767ff7817f97b3ab20896b229891eeff45bJohn McCall Qualifiers Quals; 983a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth Arg = S.Context.getUnqualifiedArrayType(Arg, Quals); 9840953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (Quals) { 985a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth Arg = S.Context.getQualifiedType(Arg, Quals); 986f290e0db835a619014538c41ed552696efc0e977Douglas Gregor RecanonicalizeArg = true; 987f290e0db835a619014538c41ed552696efc0e977Douglas Gregor } 988f290e0db835a619014538c41ed552696efc0e977Douglas Gregor } 9891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9900b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // The argument type can not be less qualified than the parameter 9910b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // type. 99261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (!(TDF & TDF_IgnoreQualifiers) && 99361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor hasInconsistentOrSupersetQualifiersOf(Param, Arg)) { 994f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 99557e97786433e70197a089360228d8f0d82e3ad4cJohn McCall Info.FirstArg = TemplateArgument(Param); 996833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.SecondArg = TemplateArgument(Arg); 99757e97786433e70197a089360228d8f0d82e3ad4cJohn McCall return Sema::TDK_Underqualified; 998f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 9990b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 10000b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor assert(TemplateTypeParm->getDepth() == 0 && "Can't deduce with depth > 0"); 1001a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth assert(Arg != S.Context.OverloadTy && "Unresolved overloaded function"); 10020953e767ff7817f97b3ab20896b229891eeff45bJohn McCall QualType DeducedType = Arg; 100349f4e1cbd839da27ff4814b4ea6d85a79f786cbdJohn McCall 100461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Remove any qualifiers on the parameter from the deduced type. 100561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // We checked the qualifiers for consistency above. 100661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers DeducedQs = DeducedType.getQualifiers(); 100761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ParamQs = Param.getQualifiers(); 100861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeCVRQualifiers(ParamQs.getCVRQualifiers()); 100961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.hasObjCGCAttr()) 101061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeObjCGCAttr(); 101161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.hasAddressSpace()) 101261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeAddressSpace(); 101361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedType = S.Context.getQualifiedType(DeducedType.getUnqualifiedType(), 101461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs); 101561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 1016f290e0db835a619014538c41ed552696efc0e977Douglas Gregor if (RecanonicalizeArg) 1017a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth DeducedType = S.Context.getCanonicalType(DeducedType); 10181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10190d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(DeducedType); 1020dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 10210d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[Index], 10220d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 10230d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 10240d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 10250d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[Index]; 10260d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 1027dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 10280b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 1029dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10300d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[Index] = Result; 1031dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Success; 10320b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 10330b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1034f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor // Set up the template argument deduction information for a failure. 1035833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.FirstArg = TemplateArgument(ParamIn); 1036833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.SecondArg = TemplateArgument(ArgIn); 1037f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 10380bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // If the parameter is an already-substituted template parameter 10390bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // pack, do nothing: we don't know which of its arguments to look 10400bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // at, so we have to wait until all of the parameter packs in this 10410bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // expansion have arguments. 10420bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor if (isa<SubstTemplateTypeParmPackType>(Param)) 10430bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor return Sema::TDK_Success; 10440bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor 1045508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor // Check the cv-qualifiers on the parameter and argument types. 1046508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (!(TDF & TDF_IgnoreQualifiers)) { 1047508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (TDF & TDF_ParamWithReferenceType) { 104861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (hasInconsistentOrSupersetQualifiersOf(Param, Arg)) 1049508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1050cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall } else if (!IsPossiblyOpaquelyQualifiedType(Param)) { 1051508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (Param.getCVRQualifiers() != Arg.getCVRQualifiers()) 10521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Sema::TDK_NonDeducedMismatch; 1053508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor } 1054508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor } 10550b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1056d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor switch (Param->getTypeClass()) { 1057199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // No deduction possible for these types 1058199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case Type::Builtin: 1059f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 10601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1061199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T * 1062d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::Pointer: { 1063c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall QualType PointeeType; 1064c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall if (const PointerType *PointerArg = Arg->getAs<PointerType>()) { 1065c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType = PointerArg->getPointeeType(); 1066c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } else if (const ObjCObjectPointerType *PointerArg 1067c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall = Arg->getAs<ObjCObjectPointerType>()) { 1068c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType = PointerArg->getPointeeType(); 1069c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } else { 1070f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1071c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } 10721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10734112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor unsigned SubTDF = TDF & (TDF_IgnoreQualifiers | TDF_DerivedClass); 1074a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1075d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor cast<PointerType>(Param)->getPointeeType(), 1076c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType, 10774112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor Info, Deduced, SubTDF); 1078d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 10791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1080199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T & 1081d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::LValueReference: { 10826217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const LValueReferenceType *ReferenceArg = Arg->getAs<LValueReferenceType>(); 1083d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor if (!ReferenceArg) 1084f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 10851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1086a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1087d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor cast<LValueReferenceType>(Param)->getPointeeType(), 1088d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor ReferenceArg->getPointeeType(), 1089508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 0); 1090d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 10910b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1092199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T && [C++0x] 1093d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::RValueReference: { 10946217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const RValueReferenceType *ReferenceArg = Arg->getAs<RValueReferenceType>(); 1095d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor if (!ReferenceArg) 1096f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 10971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1098a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1099d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor cast<RValueReferenceType>(Param)->getPointeeType(), 1100d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor ReferenceArg->getPointeeType(), 1101508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 0); 1102d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1104199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T [] (implied, but not stated explicitly) 11054d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson case Type::IncompleteArray: { 11061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const IncompleteArrayType *IncompleteArrayArg = 1107a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsIncompleteArrayType(Arg); 11084d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (!IncompleteArrayArg) 1109f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1111e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1112a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1113a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsIncompleteArrayType(Param)->getElementType(), 11144d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson IncompleteArrayArg->getElementType(), 1115e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall Info, Deduced, SubTDF); 11164d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson } 1117199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1118199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T [integer-constant] 11194d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson case Type::ConstantArray: { 11201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const ConstantArrayType *ConstantArrayArg = 1121a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsConstantArrayType(Arg); 11224d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (!ConstantArrayArg) 1123f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const ConstantArrayType *ConstantArrayParm = 1126a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsConstantArrayType(Param); 11274d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (ConstantArrayArg->getSize() != ConstantArrayParm->getSize()) 1128f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1130e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1131a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 11324d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson ConstantArrayParm->getElementType(), 11334d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson ConstantArrayArg->getElementType(), 1134e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall Info, Deduced, SubTDF); 11354d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson } 11364d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson 1137199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // type [i] 1138199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case Type::DependentSizedArray: { 1139a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth const ArrayType *ArrayArg = S.Context.getAsArrayType(Arg); 1140199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (!ArrayArg) 1141f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1143e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1144e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall 1145199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Check the element type of the arrays 1146199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor const DependentSizedArrayType *DependentArrayParm 1147a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = S.Context.getAsDependentSizedArrayType(Param); 1148f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1149a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 1150f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor DependentArrayParm->getElementType(), 1151f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor ArrayArg->getElementType(), 1152e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall Info, Deduced, SubTDF)) 1153f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 11541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1155199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Determine the array bound is something we can deduce. 11561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NonTypeTemplateParmDecl *NTTP 1157199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = getDeducedParameterFromExpr(DependentArrayParm->getSizeExpr()); 1158199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (!NTTP) 1159f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 11601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // We can perform template argument deduction for the given non-type 1162199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // template parameter. 11631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 1164199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument at depth > 0"); 11651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const ConstantArrayType *ConstantArrayArg 1166335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson = dyn_cast<ConstantArrayType>(ArrayArg)) { 1167335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson llvm::APSInt Size(ConstantArrayArg->getSize()); 1168dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceNonTypeTemplateArgument(S, NTTP, Size, 11699d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor S.Context.getSizeType(), 117002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor /*ArrayBound=*/true, 1171f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 1172335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson } 1173199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (const DependentSizedArrayType *DependentArrayArg 1174199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = dyn_cast<DependentSizedArrayType>(ArrayArg)) 117534c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor if (DependentArrayArg->getSizeExpr()) 117634c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, 117734c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor DependentArrayArg->getSizeExpr(), 117834c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor Info, Deduced); 11791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1180199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Incomplete type does not match a dependently-sized array type 1181f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1182199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 11831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // type(*)(T) 11851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(*)() 11861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(*)(T) 1187a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson case Type::FunctionProto: { 118873b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor unsigned SubTDF = TDF & TDF_TopLevelParameterTypeList; 11891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *FunctionProtoArg = 1190a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson dyn_cast<FunctionProtoType>(Arg); 1191a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson if (!FunctionProtoArg) 1192f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *FunctionProtoParam = 1195a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson cast<FunctionProtoType>(Param); 1196994b6cb65c9daba2128366bc4c64be6dbf953528Anders Carlsson 1197dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (FunctionProtoParam->getTypeQuals() 1198e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor != FunctionProtoArg->getTypeQuals() || 1199dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionProtoParam->getRefQualifier() 1200e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor != FunctionProtoArg->getRefQualifier() || 1201e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor FunctionProtoParam->isVariadic() != FunctionProtoArg->isVariadic()) 1202f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1203994b6cb65c9daba2128366bc4c64be6dbf953528Anders Carlsson 1204a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson // Check return types. 1205f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1206a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 1207f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor FunctionProtoParam->getResultType(), 1208f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor FunctionProtoArg->getResultType(), 1209508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 0)) 1210f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 12111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1212603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return DeduceTemplateArguments(S, TemplateParams, 1213603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoParam->arg_type_begin(), 1214603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoParam->getNumArgs(), 1215603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoArg->arg_type_begin(), 1216603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoArg->getNumArgs(), 121773b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Info, Deduced, SubTDF); 1218a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson } 12191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12203cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall case Type::InjectedClassName: { 12213cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // Treat a template's injected-class-name as if the template 12223cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // specialization type had been used. 122331f17ecbef57b5679c017c375db330546b7b5145John McCall Param = cast<InjectedClassNameType>(Param) 122431f17ecbef57b5679c017c375db330546b7b5145John McCall ->getInjectedSpecializationType(); 12253cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall assert(isa<TemplateSpecializationType>(Param) && 12263cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall "injected class name is not a template specialization type"); 12273cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // fall through 12283cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall } 12293cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall 1230f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor // template-name<T> (where template-name refers to a class template) 1231d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor // template-name<i> 1232db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<T> 1233db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<i> 1234db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<> 1235d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor case Type::TemplateSpecialization: { 1236d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor const TemplateSpecializationType *SpecParam 1237d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor = cast<TemplateSpecializationType>(Param); 12381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1239de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Try to deduce template arguments from the template-id. 1240de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Sema::TemplateDeductionResult Result 1241a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, SpecParam, Arg, 1242de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced); 12431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12444a5c15f75f76b95e1c2ceb6fa2737dcadd5f4be1Douglas Gregor if (Result && (TDF & TDF_DerivedClass)) { 1245de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // C++ [temp.deduct.call]p3b3: 1246de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If P is a class, and P has the form template-id, then A can be a 1247de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // derived class of the deduced A. Likewise, if P is a pointer to a 12481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // class of the form template-id, A can be a pointer to a derived 1249de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // class pointed to by the deduced A. 1250de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // 1251de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // More importantly: 12521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // These alternatives are considered only if type deduction would 1253de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // otherwise fail. 1254a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth if (const RecordType *RecordT = Arg->getAs<RecordType>()) { 1255a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // We cannot inspect base classes as part of deduction when the type 1256a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // is incomplete, so either instantiate any templates necessary to 1257a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // complete the type, or skip over it if it cannot be completed. 12585769d6195087229770d7ac90449443e026c47103John McCall if (S.RequireCompleteType(Info.getLocation(), Arg, 0)) 1259a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return Result; 1260a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth 1261de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Use data recursion to crawl through the list of base classes. 12621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Visited contains the set of nodes we have already visited, while 1263de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // ToVisit is our stack of records that we still need to visit. 1264de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor llvm::SmallPtrSet<const RecordType *, 8> Visited; 1265de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor llvm::SmallVector<const RecordType *, 8> ToVisit; 1266de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor ToVisit.push_back(RecordT); 1267de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor bool Successful = false; 1268053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> DeducedOrig(0); 1269053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor DeducedOrig = Deduced; 1270de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor while (!ToVisit.empty()) { 1271de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Retrieve the next class in the inheritance hierarchy. 1272de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const RecordType *NextT = ToVisit.back(); 1273de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor ToVisit.pop_back(); 12741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1275de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If we have already seen this type, skip it. 1276de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!Visited.insert(NextT)) 1277de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor continue; 12781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1279de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If this is a base class, try to perform template argument 1280de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // deduction from it. 1281de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (NextT != RecordT) { 1282de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Sema::TemplateDeductionResult BaseResult 1283a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, SpecParam, 1284de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor QualType(NextT, 0), Info, Deduced); 12851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1286de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If template argument deduction for this base was successful, 1287053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor // note that we had some success. Otherwise, ignore any deductions 1288053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor // from this base class. 1289053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor if (BaseResult == Sema::TDK_Success) { 1290de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Successful = true; 1291053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor DeducedOrig = Deduced; 1292053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor } 1293053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor else 1294053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor Deduced = DeducedOrig; 1295de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 12961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1297de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Visit base classes 1298de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor CXXRecordDecl *Next = cast<CXXRecordDecl>(NextT->getDecl()); 1299de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor for (CXXRecordDecl::base_class_iterator Base = Next->bases_begin(), 1300de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor BaseEnd = Next->bases_end(); 13019994a34f6cf842721ba7723edc0b9036229fe387Sebastian Redl Base != BaseEnd; ++Base) { 13021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(Base->getType()->isRecordType() && 1303de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor "Base class that isn't a record?"); 13046217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek ToVisit.push_back(Base->getType()->getAs<RecordType>()); 1305de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 1306de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1308de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Successful) 1309de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_Success; 1310de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1312de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1314de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 1315d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor } 1316d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 1317637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T type::* 1318637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T T::* 1319637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (type::*)() 1320637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (T::*)() 1321637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (type::*)(T) 1322637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (T::*)(T) 1323637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (type::*)(T) 1324637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (T::*)() 1325637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (T::*)(T) 1326637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::MemberPointer: { 1327637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor const MemberPointerType *MemPtrParam = cast<MemberPointerType>(Param); 1328637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor const MemberPointerType *MemPtrArg = dyn_cast<MemberPointerType>(Arg); 1329637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor if (!MemPtrArg) 1330f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1331f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1332f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1333a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 1334f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor MemPtrParam->getPointeeType(), 1335f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor MemPtrArg->getPointeeType(), 1336508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 1337508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF & TDF_IgnoreQualifiers)) 1338f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 1339f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1340a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1341f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor QualType(MemPtrParam->getClass(), 0), 1342f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor QualType(MemPtrArg->getClass(), 0), 1343508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 0); 1344637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor } 1345637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor 13469a917e4fac79aba20fbd25983c78396475078918Anders Carlsson // (clang extension) 13479a917e4fac79aba20fbd25983c78396475078918Anders Carlsson // 13481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // type(^)(T) 13491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(^)() 13501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(^)(T) 1351859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson case Type::BlockPointer: { 1352859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson const BlockPointerType *BlockPtrParam = cast<BlockPointerType>(Param); 1353859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson const BlockPointerType *BlockPtrArg = dyn_cast<BlockPointerType>(Arg); 13541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1355859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson if (!BlockPtrArg) 1356f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 13571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1358a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1359859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson BlockPtrParam->getPointeeType(), 1360f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor BlockPtrArg->getPointeeType(), Info, 1361508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Deduced, 0); 1362859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson } 1363859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson 1364637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::TypeOfExpr: 1365637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::TypeOf: 13664714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor case Type::DependentName: 1367637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // No template argument deduction for these types 1368f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 1369637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor 1370d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor default: 1371d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor break; 13720b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 13730b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 13740b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // FIXME: Many more cases to go (to go). 1375f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Sema::TDK_Success; 13760b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 13770b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1378f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 1379a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 1380f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 1381f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor const TemplateArgument &Param, 138277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor TemplateArgument Arg, 13832a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 138402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 138577d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the template argument is a pack expansion, perform template argument 138677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // deduction against the pattern of that expansion. This only occurs during 138777d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // partial ordering. 138877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (Arg.isPackExpansion()) 138977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Arg = Arg.getPackExpansionPattern(); 1390dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 13910b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor switch (Param.getKind()) { 1392199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Null: 1393199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor assert(false && "Null template argument in parameter list"); 1394199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor break; 13951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case TemplateArgument::Type: 1397788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (Arg.getKind() == TemplateArgument::Type) 1398a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, Param.getAsType(), 1399788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Arg.getAsType(), Info, Deduced, 0); 1400788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.FirstArg = Param; 1401788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.SecondArg = Arg; 1402788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1403a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 1404788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 1405db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (Arg.getKind() == TemplateArgument::Template) 1406dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 1407788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Param.getAsTemplate(), 1408db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Arg.getAsTemplate(), Info, Deduced); 1409788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.FirstArg = Param; 1410788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.SecondArg = Arg; 1411788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1412a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 1413a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 1414a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor llvm_unreachable("caller should handle pack expansions"); 1415a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor break; 1416dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1417199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Declaration: 1418788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (Arg.getKind() == TemplateArgument::Declaration && 1419788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Param.getAsDecl()->getCanonicalDecl() == 1420788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Arg.getAsDecl()->getCanonicalDecl()) 1421788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_Success; 1422dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1423f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1424f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1425f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 14261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1427199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Integral: 1428199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Integral) { 14299d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if (hasSameExtendedValue(*Param.getAsIntegral(), *Arg.getAsIntegral())) 1430f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 1431f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1432f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1433f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1434f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1435f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 1436f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1437f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Arg.getKind() == TemplateArgument::Expression) { 1438f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1439f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1440f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1441199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 1442199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1443f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1444f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1445f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 14461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1447199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Expression: { 14481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (NonTypeTemplateParmDecl *NTTP 1449199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = getDeducedParameterFromExpr(Param.getAsExpr())) { 1450199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Integral) 1451a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, 14521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump *Arg.getAsIntegral(), 14539d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor Arg.getIntegralType(), 145402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor /*ArrayBound=*/false, 1455f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 1456199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Expression) 1457a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsExpr(), 1458f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 145915755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor if (Arg.getKind() == TemplateArgument::Declaration) 1460a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsDecl(), 146115755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor Info, Deduced); 1462dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1463f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1464f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1465f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1466199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 14671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1468199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Can't deduce anything, but that's okay. 1469f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 1470199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 1471d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson case TemplateArgument::Pack: 147220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor llvm_unreachable("Argument packs should be expanded by the caller!"); 14730b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 14741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1475f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 14760b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 14770b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 147820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \brief Determine whether there is a template argument to be used for 147920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// deduction. 148020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// 148120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// This routine "expands" argument packs in-place, overriding its input 148220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// parameters so that \c Args[ArgIdx] will be the available template argument. 148320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// 148420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \returns true if there is another template argument (which will be at 148520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \c Args[ArgIdx]), false otherwise. 1486dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic bool hasTemplateArgumentForDeduction(const TemplateArgument *&Args, 148720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned &ArgIdx, 148820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned &NumArgs) { 148920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (ArgIdx == NumArgs) 149020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return false; 1491dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 149220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument &Arg = Args[ArgIdx]; 149320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (Arg.getKind() != TemplateArgument::Pack) 149420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return true; 149520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 149620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor assert(ArgIdx == NumArgs - 1 && "Pack not at the end of argument list?"); 149720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Args = Arg.pack_begin(); 149820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor NumArgs = Arg.pack_size(); 149920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ArgIdx = 0; 150020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return ArgIdx < NumArgs; 150120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor} 150220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 15037b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor/// \brief Determine whether the given set of template arguments has a pack 15047b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor/// expansion that is not the last template argument. 15057b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregorstatic bool hasPackExpansionBeforeEnd(const TemplateArgument *Args, 15067b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor unsigned NumArgs) { 15077b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor unsigned ArgIdx = 0; 15087b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor while (ArgIdx < NumArgs) { 15097b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor const TemplateArgument &Arg = Args[ArgIdx]; 1510dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 15117b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // Unwrap argument packs. 15127b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (Args[ArgIdx].getKind() == TemplateArgument::Pack) { 15137b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor Args = Arg.pack_begin(); 15147b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor NumArgs = Arg.pack_size(); 15157b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor ArgIdx = 0; 15167b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor continue; 15177b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor } 1518dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 15197b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor ++ArgIdx; 15207b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (ArgIdx == NumArgs) 15217b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return false; 1522dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 15237b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (Arg.isPackExpansion()) 15247b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return true; 15257b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor } 1526dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 15277b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return false; 15287b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor} 15297b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 15301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic Sema::TemplateDeductionResult 1531a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 1532f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 153320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Params, unsigned NumParams, 153420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Args, unsigned NumArgs, 15352a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 15360972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced, 15370972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor bool NumberOfArgumentsMustMatch) { 1538e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1539dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 1540dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 1541e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // non-deduced context. 15427b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (hasPackExpansionBeforeEnd(Params, NumParams)) 15437b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return Sema::TDK_Success; 1544dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1545e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1546dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If P has a form that contains <T> or <i>, then each argument Pi of the 1547dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // respective template argument list P is compared with the corresponding 1548e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // argument Ai of the corresponding template argument list of A. 154920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned ArgIdx = 0, ParamIdx = 0; 1550dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (; hasTemplateArgumentForDeduction(Params, ParamIdx, NumParams); 155120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ++ParamIdx) { 155220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (!Params[ParamIdx].isPackExpansion()) { 1553e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The simple case: deduce template arguments by matching Pi and Ai. 1554dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 155520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Check whether we have enough arguments. 155620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (!hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) 15573cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return NumberOfArgumentsMustMatch? Sema::TDK_NonDeducedMismatch 15580972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor : Sema::TDK_Success; 1559dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 156077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (Args[ArgIdx].isPackExpansion()) { 156177d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // FIXME: We follow the logic of C++0x [temp.deduct.type]p22 here, 156277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // but applied to pack expansions that are template arguments. 156377d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor return Sema::TDK_NonDeducedMismatch; 156477d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor } 1565dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1566e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Perform deduction for this Pi/Ai pair. 156720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (Sema::TemplateDeductionResult Result 156877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor = DeduceTemplateArguments(S, TemplateParams, 156977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Params[ParamIdx], Args[ArgIdx], 157077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Info, Deduced)) 1571dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 1572dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 157320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Move to the next argument. 157420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ++ArgIdx; 157520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor continue; 157620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor } 1577dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1578e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The parameter is a pack expansion. 1579dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1580e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1581dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If Pi is a pack expansion, then the pattern of Pi is compared with 1582dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // each remaining argument in the template argument list of A. Each 1583dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // comparison deduces template arguments for subsequent positions in the 1584e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // template parameter packs expanded by Pi. 1585e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor TemplateArgument Pattern = Params[ParamIdx].getPackExpansionPattern(); 1586dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1587e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Compute the set of template parameter indices that correspond to 1588e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // parameter packs expanded by the pack expansion. 1589e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor llvm::SmallVector<unsigned, 2> PackIndices; 1590e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor { 1591e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor llvm::BitVector SawIndices(TemplateParams->size()); 1592e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded; 1593e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor S.collectUnexpandedParameterPacks(Pattern, Unexpanded); 1594e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 1595e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor unsigned Depth, Index; 1596e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 1597e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 1598e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor SawIndices[Index] = true; 1599e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor PackIndices.push_back(Index); 1600e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1601e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1602e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1603e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 1604dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1605e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // FIXME: If there are no remaining arguments, we can bail out early 1606e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // and set any deduced parameter packs to an empty argument pack. 1607e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The latter part of this is a (minor) correctness issue. 1608dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1609e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Save the deduced template arguments for each parameter pack expanded 1610e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // by this pack expansion, then clear out the deduction. 1611dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi llvm::SmallVector<DeducedTemplateArgument, 2> 1612e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor SavedPacks(PackIndices.size()); 16135429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor llvm::SmallVector<llvm::SmallVector<DeducedTemplateArgument, 4>, 2> 16145429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 1615dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, 16165429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks); 1617e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor 1618e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Keep track of the deduced template arguments for each parameter pack 1619dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 1620e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // template argument (the inner SmallVectors). 1621e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor bool HasAnyArguments = false; 1622e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor while (hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) { 1623e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor HasAnyArguments = true; 1624dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1625e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Deduce template arguments from the pattern. 1626dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (Sema::TemplateDeductionResult Result 1627e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, Pattern, Args[ArgIdx], 1628e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info, Deduced)) 1629e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor return Result; 1630dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1631e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 1632e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 1633e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // for that pack, then clear out the deduced argument. 1634e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 1635e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 1636e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (!DeducedArg.isNull()) { 1637e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 1638e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor DeducedArg = DeducedTemplateArgument(); 1639e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1640e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1641dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1642e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor ++ArgIdx; 1643e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1644dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1645e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 1646e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // pack expansion. 16470216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 1648dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(S, TemplateParams, HasAnyArguments, 16490216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 16500216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 1651dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 16520b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 1653dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 165420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // If there is an argument remaining, then we had too many arguments. 16550972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor if (NumberOfArgumentsMustMatch && 16560972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) 16573cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1658dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1659f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 16600b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 16610b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 166220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregorstatic Sema::TemplateDeductionResult 166320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas GregorDeduceTemplateArguments(Sema &S, 166420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateParameterList *TemplateParams, 166520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgumentList &ParamList, 166620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgumentList &ArgList, 166720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateDeductionInfo &Info, 166820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 1669dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 167020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ParamList.data(), ParamList.size(), 167120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ArgList.data(), ArgList.size(), 167220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Info, Deduced); 167320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor} 167420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 1675f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor/// \brief Determine whether two template arguments are the same. 16761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic bool isSameTemplateArg(ASTContext &Context, 1677f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor const TemplateArgument &X, 1678f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor const TemplateArgument &Y) { 1679f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (X.getKind() != Y.getKind()) 1680f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 16811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1682f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor switch (X.getKind()) { 1683f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Null: 1684f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor assert(false && "Comparing NULL template argument"); 1685f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor break; 16861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1687f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Type: 1688f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Context.getCanonicalType(X.getAsType()) == 1689f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Context.getCanonicalType(Y.getAsType()); 16901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1691f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Declaration: 169297fbaa2a38804268a024f1a104b43fcf8b4411b0Argyrios Kyrtzidis return X.getAsDecl()->getCanonicalDecl() == 169397fbaa2a38804268a024f1a104b43fcf8b4411b0Argyrios Kyrtzidis Y.getAsDecl()->getCanonicalDecl(); 16941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1695788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 1696a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 1697a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor return Context.getCanonicalTemplateName( 1698a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor X.getAsTemplateOrTemplatePattern()).getAsVoidPointer() == 1699a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Context.getCanonicalTemplateName( 1700a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Y.getAsTemplateOrTemplatePattern()).getAsVoidPointer(); 1701dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1702f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Integral: 1703f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return *X.getAsIntegral() == *Y.getAsIntegral(); 17041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1705788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Expression: { 1706788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor llvm::FoldingSetNodeID XID, YID; 1707788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor X.getAsExpr()->Profile(XID, Context, true); 1708dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Y.getAsExpr()->Profile(YID, Context, true); 1709788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return XID == YID; 1710788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor } 17111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1712f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Pack: 1713f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (X.pack_size() != Y.pack_size()) 1714f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 17151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 17161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (TemplateArgument::pack_iterator XP = X.pack_begin(), 17171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump XPEnd = X.pack_end(), 1718f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor YP = Y.pack_begin(); 17191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump XP != XPEnd; ++XP, ++YP) 1720f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (!isSameTemplateArg(Context, *XP, *YP)) 1721f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 1722f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 1723f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return true; 1724f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor } 1725f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 1726f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 1727f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor} 1728f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 172954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \brief Allocate a TemplateArgumentLoc where all locations have 173054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// been initialized to the given location. 173154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 173254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param S The semantic analysis object. 173354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 173454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param The template argument we are producing template argument 173554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// location information for. 173654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 173754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param NTTPType For a declaration template argument, the type of 173854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// the non-type template parameter that corresponds to this template 173954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// argument. 174054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 174154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param Loc The source location to use for the resulting template 174254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// argument. 1743dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic TemplateArgumentLoc 174454c53cca105ed595e12fecf04e415c3712bda936Douglas GregorgetTrivialTemplateArgumentLoc(Sema &S, 1745dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const TemplateArgument &Arg, 174654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor QualType NTTPType, 174754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor SourceLocation Loc) { 174854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor switch (Arg.getKind()) { 174954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Null: 175054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor llvm_unreachable("Can't get a NULL template argument here"); 175154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor break; 1752dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 175354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Type: 1754dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return TemplateArgumentLoc(Arg, 175554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor S.Context.getTrivialTypeSourceInfo(Arg.getAsType(), Loc)); 1756dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 175754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Declaration: { 175854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Expr *E 1759ba68eca7582a62e3e2ff4b0eba1b2b73a6b80895Douglas Gregor = S.BuildExpressionFromDeclTemplateArgument(Arg, NTTPType, Loc) 176054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor .takeAs<Expr>(); 176154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(TemplateArgument(E), E); 176254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1763dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 176454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Integral: { 176554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Expr *E 1766ba68eca7582a62e3e2ff4b0eba1b2b73a6b80895Douglas Gregor = S.BuildExpressionFromIntegralTemplateArgument(Arg, Loc).takeAs<Expr>(); 176754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(TemplateArgument(E), E); 176854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1769dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1770b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor case TemplateArgument::Template: 1771b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor case TemplateArgument::TemplateExpansion: { 1772b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor NestedNameSpecifierLocBuilder Builder; 1773b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor TemplateName Template = Arg.getAsTemplate(); 1774b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) 1775b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.MakeTrivial(S.Context, DTN->getQualifier(), Loc); 1776b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor else if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName()) 1777b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.MakeTrivial(S.Context, QTN->getQualifier(), Loc); 1778b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1779b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor if (Arg.getKind() == TemplateArgument::Template) 1780b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor return TemplateArgumentLoc(Arg, 1781b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.getWithLocInContext(S.Context), 1782b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Loc); 1783b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1784b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1785b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor return TemplateArgumentLoc(Arg, Builder.getWithLocInContext(S.Context), 1786b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Loc, Loc); 1787b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor } 1788a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 178954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Expression: 179054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(Arg, Arg.getAsExpr()); 1791dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 179254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Pack: 179354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(Arg, TemplateArgumentLocInfo()); 179454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1795dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 179654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(); 179754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor} 179854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 179954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 180054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \brief Convert the given deduced template argument and add it to the set of 180154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// fully-converted template arguments. 1802dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic bool ConvertDeducedTemplateArgument(Sema &S, NamedDecl *Param, 180354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor DeducedTemplateArgument Arg, 1804dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NamedDecl *Template, 1805dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi QualType NTTPType, 18066952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor unsigned ArgumentPackIndex, 180754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateDeductionInfo &Info, 180854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor bool InFunctionTemplate, 180954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor llvm::SmallVectorImpl<TemplateArgument> &Output) { 181054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor if (Arg.getKind() == TemplateArgument::Pack) { 181154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // This is a template argument pack, so check each of its arguments against 181254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // the template parameter. 181354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor llvm::SmallVector<TemplateArgument, 2> PackedArgsBuilder; 1814dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (TemplateArgument::pack_iterator PA = Arg.pack_begin(), 1815135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor PAEnd = Arg.pack_end(); 181654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor PA != PAEnd; ++PA) { 1817d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // When converting the deduced template argument, append it to the 1818d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // general output list. We need to do this so that the template argument 1819d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // checking logic has all of the prior template arguments available. 182054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor DeducedTemplateArgument InnerArg(*PA); 182154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InnerArg.setDeducedFromArrayBound(Arg.wasDeducedFromArrayBound()); 1822dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (ConvertDeducedTemplateArgument(S, Param, InnerArg, Template, 18236952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor NTTPType, PackedArgsBuilder.size(), 18246952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor Info, InFunctionTemplate, Output)) 182554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return true; 1826dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1827d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // Move the converted template argument into our argument pack. 1828d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor PackedArgsBuilder.push_back(Output.back()); 1829d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Output.pop_back(); 183054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1831dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 183254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Create the resulting argument pack. 1833dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Output.push_back(TemplateArgument::CreatePackCopy(S.Context, 1834203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor PackedArgsBuilder.data(), 1835203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor PackedArgsBuilder.size())); 183654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return false; 183754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1838dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 183954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Convert the deduced template argument into a template 184054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // argument that we can check, almost as if the user had written 184154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // the template argument explicitly. 184254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateArgumentLoc ArgLoc = getTrivialTemplateArgumentLoc(S, Arg, NTTPType, 184354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.getLocation()); 1844dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 184554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Check the template argument, converting it as necessary. 184654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return S.CheckTemplateArgument(Param, ArgLoc, 184754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template, 184854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template->getLocation(), 184954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template->getSourceRange().getEnd(), 18506952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor ArgumentPackIndex, 185154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Output, 185254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InFunctionTemplate 185354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor ? (Arg.wasDeducedFromArrayBound() 1854dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ? Sema::CTAK_DeducedFromArrayBound 185554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor : Sema::CTAK_Deduced) 185654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor : Sema::CTAK_Specified); 185754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor} 185854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 185931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// Complete template argument deduction for a class template partial 186031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// specialization. 186131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregorstatic Sema::TemplateDeductionResult 1862dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiFinishTemplateArgumentDeduction(Sema &S, 186331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor ClassTemplatePartialSpecializationDecl *Partial, 186431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor const TemplateArgumentList &TemplateArgs, 186531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced, 18662a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info) { 186731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // Trap errors. 186831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Sema::SFINAETrap Trap(S); 1869dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 187031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Sema::ContextRAII SavedContext(S, Partial); 1871f5813826802c2e76cdc13cae834ebfd4518d74a6John McCall 187202cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // C++ [temp.deduct.type]p2: 187302cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // [...] or if any template argument remains neither deduced nor 187402cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // explicitly specified, template argument deduction fails. 1875910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor llvm::SmallVector<TemplateArgument, 4> Builder; 1876033a3cad525e5b221ba035ffc3e0abfa1241d90eDouglas Gregor TemplateParameterList *PartialParams = Partial->getTemplateParameters(); 1877033a3cad525e5b221ba035ffc3e0abfa1241d90eDouglas Gregor for (unsigned I = 0, N = PartialParams->size(); I != N; ++I) { 187854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor NamedDecl *Param = PartialParams->getParam(I); 1879f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Deduced[I].isNull()) { 188054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.Param = makeTemplateParameter(Param); 188131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_Incomplete; 1882f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 1883dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 188454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // We have deduced this argument, so it still needs to be 188554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // checked and converted. 1886dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 188754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // First, for a non-type template parameter type that is 188854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // initialized by a declaration, we need the type of the 188954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // corresponding non-type template parameter. 189054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor QualType NTTPType; 1891dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NonTypeTemplateParmDecl *NTTP 1892d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor = dyn_cast<NonTypeTemplateParmDecl>(Param)) { 189354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor NTTPType = NTTP->getType(); 1894d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor if (NTTPType->isDependentType()) { 1895dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, 1896d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Builder.data(), Builder.size()); 1897d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTPType = S.SubstType(NTTPType, 1898d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor MultiLevelTemplateArgumentList(TemplateArgs), 1899d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTP->getLocation(), 1900d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTP->getDeclName()); 1901d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor if (NTTPType.isNull()) { 1902d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Info.Param = makeTemplateParameter(Param); 1903d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // FIXME: These template arguments are temporary. Free them! 1904dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(S.Context, 1905dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.data(), 1906d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Builder.size())); 1907d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor return Sema::TDK_SubstitutionFailure; 1908d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 1909d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 1910d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 1911d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor 191254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor if (ConvertDeducedTemplateArgument(S, Param, Deduced[I], 19136952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor Partial, NTTPType, 0, Info, false, 191454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Builder)) { 191554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.Param = makeTemplateParameter(Param); 191654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // FIXME: These template arguments are temporary. Free them! 1917dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder.data(), 1918dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.size())); 191954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return Sema::TDK_SubstitutionFailure; 192054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 192102cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor } 1922dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 192302cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // Form the template argument list from the deduced template arguments. 19241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *DeducedArgumentList 1925dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = TemplateArgumentList::CreateCopy(S.Context, Builder.data(), 1926910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.size()); 1927910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor 1928f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.reset(DeducedArgumentList); 192902cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor 193002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // Substitute the deduced template arguments into the template 193102cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // arguments of the class template partial specialization, and 193202cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // verify that the instantiated template arguments are both valid 193302cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // and are equivalent to the template arguments originally provided 19341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to the class template. 19352a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(S); 193602cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor ClassTemplateDecl *ClassTemplate = Partial->getSpecializedTemplate(); 1937833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall const TemplateArgumentLoc *PartialTemplateArgs 1938833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall = Partial->getTemplateArgsAsWritten(); 1939d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall 1940d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall // Note that we don't provide the langle and rangle locations. 1941d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall TemplateArgumentListInfo InstArgs; 1942d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall 1943e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (S.Subst(PartialTemplateArgs, 1944e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Partial->getNumTemplateArgsAsWritten(), 1945e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor InstArgs, MultiLevelTemplateArgumentList(*DeducedArgumentList))) { 1946e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor unsigned ArgIdx = InstArgs.size(), ParamIdx = ArgIdx; 1947e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (ParamIdx >= Partial->getTemplateParameters()->size()) 1948e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor ParamIdx = Partial->getTemplateParameters()->size() - 1; 1949e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor 1950e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Decl *Param 1951e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor = const_cast<NamedDecl *>( 1952e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Partial->getTemplateParameters()->getParam(ParamIdx)); 1953e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info.Param = makeTemplateParameter(Param); 1954e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info.FirstArg = PartialTemplateArgs[ArgIdx].getArgument(); 1955e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor return Sema::TDK_SubstitutionFailure; 1956833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall } 1957833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall 1958910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor llvm::SmallVector<TemplateArgument, 4> ConvertedInstArgs; 195931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (S.CheckTemplateArgumentList(ClassTemplate, Partial->getLocation(), 196054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InstArgs, false, ConvertedInstArgs)) 196131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 1962dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 196354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateParameterList *TemplateParams 196454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor = ClassTemplate->getTemplateParameters(); 196554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor for (unsigned I = 0, E = TemplateParams->size(); I != E; ++I) { 1966910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor TemplateArgument InstArg = ConvertedInstArgs.data()[I]; 196731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (!isSameTemplateArg(S.Context, TemplateArgs[I], InstArg)) { 19682fdc5e8199e1e239620f2faae88997153703e16fDouglas Gregor Info.Param = makeTemplateParameter(TemplateParams->getParam(I)); 1969f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Info.FirstArg = TemplateArgs[I]; 1970f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Info.SecondArg = InstArg; 197131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1972f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor } 197302cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor } 197402cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor 1975bb2604122f4186b6f666481f699b27c7e7a95790Douglas Gregor if (Trap.hasErrorOccurred()) 197631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 1977bb2604122f4186b6f666481f699b27c7e7a95790Douglas Gregor 197831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_Success; 197931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor} 198031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 198131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// \brief Perform template argument deduction to determine whether 198231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// the given template arguments match the given class template 198331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// partial specialization per C++ [temp.class.spec.match]. 198431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas GregorSema::TemplateDeductionResult 198531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas GregorSema::DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial, 198631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor const TemplateArgumentList &TemplateArgs, 198731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor TemplateDeductionInfo &Info) { 198831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // C++ [temp.class.spec.match]p2: 198931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // A partial specialization matches a given actual template 199031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // argument list if the template arguments of the partial 199131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // specialization can be deduced from the actual template argument 199231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // list (14.8.2). 199331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor SFINAETrap Trap(*this); 199431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor llvm::SmallVector<DeducedTemplateArgument, 4> Deduced; 199531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Deduced.resize(Partial->getTemplateParameters()->size()); 199631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (TemplateDeductionResult Result 199731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor = ::DeduceTemplateArguments(*this, 199831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Partial->getTemplateParameters(), 199931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Partial->getTemplateArgs(), 200031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor TemplateArgs, Info, Deduced)) 200131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Result; 200231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 200331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor InstantiatingTemplate Inst(*this, Partial->getLocation(), Partial, 20049b623639378d53a675921ddfa7316034d571881eDouglas Gregor Deduced.data(), Deduced.size(), Info); 200531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (Inst) 200631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return TDK_InstantiationDepth; 200731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 200831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (Trap.hasErrorOccurred()) 200931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2010dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2011dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return ::FinishTemplateArgumentDeduction(*this, Partial, TemplateArgs, 201231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Deduced, Info); 20130b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 2014031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 20154112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor/// \brief Determine whether the given type T is a simple-template-id type. 20164112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregorstatic bool isSimpleTemplateIdType(QualType T) { 20171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateSpecializationType *Spec 2018183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = T->getAs<TemplateSpecializationType>()) 20194112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor return Spec->getTemplateName().getAsTemplateDecl() != 0; 20201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 20214112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor return false; 20224112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor} 202383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 202483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \brief Substitute the explicitly-provided template arguments into the 202583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// given function template according to C++ [temp.arg.explicit]. 202683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 202783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionTemplate the function template into which the explicit 202883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template arguments will be substituted. 202983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 20301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param ExplicitTemplateArguments the explicitly-specified template 203183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// arguments. 203283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 20331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param Deduced the deduced template arguments, which will be populated 203483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// with the converted and checked explicit template arguments. 203583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 20361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param ParamTypes will be populated with the instantiated function 203783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// parameters. 203883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 203983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionType if non-NULL, the result type of the function template 204083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// will also be instantiated and the pointed-to value will be updated with 204183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// the instantiated function type. 204283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 204383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Info if substitution fails for any reason, this object will be 204483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// populated with more information about the failure. 204583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 204683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \returns TDK_Success if substitution was successful, or some failure 204783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// condition. 204883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::TemplateDeductionResult 204983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::SubstituteExplicitTemplateArguments( 205083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionTemplateDecl *FunctionTemplate, 205167714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo &ExplicitTemplateArgs, 205202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced, 205383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor llvm::SmallVectorImpl<QualType> &ParamTypes, 205483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType *FunctionType, 205583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionInfo &Info) { 205683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 205783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 205883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 205983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 2060d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs.size() == 0) { 206183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // No arguments to substitute; just copy over the parameter types and 206283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // fill in the function type. 206383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor for (FunctionDecl::param_iterator P = Function->param_begin(), 206483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor PEnd = Function->param_end(); 206583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor P != PEnd; 206683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ++P) 206783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes.push_back((*P)->getType()); 20681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 206983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType) 207083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor *FunctionType = Function->getType(); 207183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Success; 207283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 20731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 207483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Substitution of the explicit template arguments into a function template 207583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor /// is a SFINAE context. Trap any errors that might occur. 20761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 20771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 207883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.arg.explicit]p3: 20791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Template arguments that are present shall be specified in the 20801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // declaration order of their corresponding template-parameters. The 208183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template argument list shall not specify more template-arguments than 20821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // there are corresponding template-parameters. 2083910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor llvm::SmallVector<TemplateArgument, 4> Builder; 20841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 20851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Enter a new template instantiation context where we check the 208683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly-specified template arguments against this function template, 208783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // and then substitute them into the function parameter types. 20881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), 208983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionTemplate, Deduced.data(), Deduced.size(), 20909b623639378d53a675921ddfa7316034d571881eDouglas Gregor ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution, 20919b623639378d53a675921ddfa7316034d571881eDouglas Gregor Info); 209283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (Inst) 209383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_InstantiationDepth; 20941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 209583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (CheckTemplateArgumentList(FunctionTemplate, 209683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor SourceLocation(), 2097d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall ExplicitTemplateArgs, 209883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor true, 2099f1a8445036a2d047c7165d4170e3058cdeaba6ebDouglas Gregor Builder) || Trap.hasErrorOccurred()) { 2100910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor unsigned Index = Builder.size(); 2101fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor if (Index >= TemplateParams->size()) 2102fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor Index = TemplateParams->size() - 1; 2103fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor Info.Param = makeTemplateParameter(TemplateParams->getParam(Index)); 210483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_InvalidExplicitArguments; 2105f1a8445036a2d047c7165d4170e3058cdeaba6ebDouglas Gregor } 21061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 210783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Form the template argument list from the explicitly-specified 210883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template arguments. 21091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *ExplicitArgumentList 2110910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); 211183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.reset(ExplicitArgumentList); 2112dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2113df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // Template argument deduction and the final substitution should be 2114df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // done in the context of the templated declaration. Explicit 2115df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // argument substitution, on the other hand, needs to happen in the 2116df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // calling context. 2117df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); 2118df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall 2119dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we deduced template arguments for a template parameter pack, 2120d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // note that the template argument pack is partially substituted and record 2121d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // the explicit template arguments. They'll be used as part of deduction 2122d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // for this template parameter pack. 2123d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor for (unsigned I = 0, N = Builder.size(); I != N; ++I) { 2124d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument &Arg = Builder[I]; 2125d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (Arg.getKind() == TemplateArgument::Pack) { 2126d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor CurrentInstantiationScope->SetPartiallySubstitutedPack( 2127dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateParams->getParam(I), 2128d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Arg.pack_begin(), 2129d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Arg.pack_size()); 2130d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor break; 2131d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 2132d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 2133d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor 213483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Instantiate the types of each of the function parameters given the 213583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly-specified template arguments. 2136dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (SubstParmTypes(Function->getLocation(), 2137a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor Function->param_begin(), Function->getNumParams(), 2138a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor MultiLevelTemplateArgumentList(*ExplicitArgumentList), 2139a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor ParamTypes)) 2140a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor return TDK_SubstitutionFailure; 214183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 214283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // If the caller wants a full function type back, instantiate the return 214383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // type and form that function type. 214483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType) { 214583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // FIXME: exception-specifications? 21461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *Proto 2147183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Function->getType()->getAs<FunctionProtoType>(); 214883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor assert(Proto && "Function template does not have a prototype?"); 21491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 21501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump QualType ResultType 2151357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor = SubstType(Proto->getResultType(), 2152357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor MultiLevelTemplateArgumentList(*ExplicitArgumentList), 2153357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor Function->getTypeSpecStartLoc(), 2154357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor Function->getDeclName()); 215583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (ResultType.isNull() || Trap.hasErrorOccurred()) 215683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 21571eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 21581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump *FunctionType = BuildFunctionType(ResultType, 215983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes.data(), ParamTypes.size(), 216083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Proto->isVariadic(), 216183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Proto->getTypeQuals(), 2162c938c1668b4fd12af154e965dd935a89e4801a70Douglas Gregor Proto->getRefQualifier(), 216383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Function->getLocation(), 2164fa869547eb1cab12d7e0c0dfa8ba594e336b9b32Eli Friedman Function->getDeclName(), 2165fa869547eb1cab12d7e0c0dfa8ba594e336b9b32Eli Friedman Proto->getExtInfo()); 216683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType->isNull() || Trap.hasErrorOccurred()) 216783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 216883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 21691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 217083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.arg.explicit]p2: 21711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Trailing template arguments that can be deduced (14.8.2) may be 21721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // omitted from the list of explicit template-arguments. If all of the 217383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template arguments can be deduced, they may all be omitted; in this 217483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // case, the empty template argument list <> itself may also be omitted. 217583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // 2176d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Take all of the explicitly-specified arguments and put them into 2177d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // the set of deduced template arguments. Explicitly-specified 2178d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // parameter packs, however, will be set to NULL since the deduction 2179d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // mechanisms handle explicitly-specified argument packs directly. 218083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Deduced.reserve(TemplateParams->size()); 2181d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor for (unsigned I = 0, N = ExplicitArgumentList->size(); I != N; ++I) { 2182d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument &Arg = ExplicitArgumentList->get(I); 2183d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (Arg.getKind() == TemplateArgument::Pack) 2184d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Deduced.push_back(DeducedTemplateArgument()); 2185d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor else 2186d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Deduced.push_back(Arg); 2187d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 21881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 218983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Success; 219083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 219183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 21921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Finish template argument deduction for a function template, 219383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// checking the deduced template arguments for completeness and forming 219483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// the function template specialization. 21951eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::TemplateDeductionResult 219683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::FinishTemplateArgumentDeduction(FunctionTemplateDecl *FunctionTemplate, 219702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVectorImpl<DeducedTemplateArgument> &Deduced, 219802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified, 219983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *&Specialization, 220083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionInfo &Info) { 220183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 220283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 22031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 220451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Template argument deduction for function templates in a SFINAE context. 220551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Trap any errors that might occur. 220651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor SFINAETrap Trap(*this); 220751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 220851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Enter a new template instantiation context while we instantiate the 220951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // actual function declaration. 221051ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), 221151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate, Deduced.data(), Deduced.size(), 22129b623639378d53a675921ddfa7316034d571881eDouglas Gregor ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution, 22139b623639378d53a675921ddfa7316034d571881eDouglas Gregor Info); 221451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (Inst) 221551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor return TDK_InstantiationDepth; 221651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 221796db310ab7ca59e1890ddef25a3701bc2909d20fJohn McCall ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); 2218f5813826802c2e76cdc13cae834ebfd4518d74a6John McCall 221983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.deduct.type]p2: 222083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // [...] or if any template argument remains neither deduced nor 222183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly specified, template argument deduction fails. 2222910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor llvm::SmallVector<TemplateArgument, 4> Builder; 2223b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { 2224b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NamedDecl *Param = TemplateParams->getParam(I); 2225dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 222651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (!Deduced[I].isNull()) { 22273273b0cea879c7af345d6bf98502bbf73fc4fde1Douglas Gregor if (I < NumExplicitlySpecified) { 222802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // We have already fully type-checked and converted this 2229dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // argument, because it was explicitly-specified. Just record the 22303273b0cea879c7af345d6bf98502bbf73fc4fde1Douglas Gregor // presence of this argument. 2231910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.push_back(Deduced[I]); 223202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor continue; 223302024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 223402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 223502024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // We have deduced this argument, so it still needs to be 223602024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // checked and converted. 223702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 223802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // First, for a non-type template parameter type that is 223902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // initialized by a declaration, we need the type of the 224002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // corresponding non-type template parameter. 224102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor QualType NTTPType; 2242dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NonTypeTemplateParmDecl *NTTP 2243dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = dyn_cast<NonTypeTemplateParmDecl>(Param)) { 2244b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTPType = NTTP->getType(); 2245b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (NTTPType->isDependentType()) { 2246dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, 2247b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Builder.data(), Builder.size()); 2248b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTPType = SubstType(NTTPType, 2249b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor MultiLevelTemplateArgumentList(TemplateArgs), 2250b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTP->getLocation(), 2251b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTP->getDeclName()); 2252b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (NTTPType.isNull()) { 2253b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2254b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2255dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, 2256dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.data(), 2257b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Builder.size())); 2258b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor return TDK_SubstitutionFailure; 225902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 226002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 226102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 226202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 2263b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (ConvertDeducedTemplateArgument(*this, Param, Deduced[I], 22646952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor FunctionTemplate, NTTPType, 0, Info, 226554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor true, Builder)) { 2266b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2267910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2268dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), 2269dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.size())); 227002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor return TDK_SubstitutionFailure; 227102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 227202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 227351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor continue; 227451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor } 2275dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2276ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // C++0x [temp.arg.explicit]p3: 2277dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // A trailing template parameter pack (14.5.3) not otherwise deduced will 2278ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // be deduced to an empty sequence of template arguments. 2279ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // FIXME: Where did the word "trailing" come from? 2280ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor if (Param->isTemplateParameterPack()) { 2281d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // We may have had explicitly-specified template arguments for this 2282d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template parameter pack. If so, our empty deduction extends the 2283d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // explicitly-specified set (C++0x [temp.arg.explicit]p9). 2284d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument *ExplicitArgs; 2285d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor unsigned NumExplicitArgs; 2286d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (CurrentInstantiationScope->getPartiallySubstitutedPack(&ExplicitArgs, 2287d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor &NumExplicitArgs) 2288d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor == Param) 2289d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Builder.push_back(TemplateArgument(ExplicitArgs, NumExplicitArgs)); 2290dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi else 2291d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Builder.push_back(TemplateArgument(0, 0)); 2292dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2293ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor continue; 2294ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor } 229551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 2296dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Substitute into the default template argument, if available. 229751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor TemplateArgumentLoc DefArg 229851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor = SubstDefaultTemplateArgumentIfAvailable(FunctionTemplate, 229951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getLocation(), 230051ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getSourceRange().getEnd(), 230151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Param, 230251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Builder); 230351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 230451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // If there was no default argument, deduction is incomplete. 230551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (DefArg.getArgument().isNull()) { 230683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.Param = makeTemplateParameter( 230751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor const_cast<NamedDecl *>(TemplateParams->getParam(I))); 230883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Incomplete; 230983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 2310dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 231151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Check whether we can actually use the default argument. 231251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (CheckTemplateArgument(Param, DefArg, 231351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate, 231451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getLocation(), 231551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getSourceRange().getEnd(), 23166952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor 0, Builder, 23178735b294a257a07ca158c28094d7324f0adf889aDouglas Gregor CTAK_Specified)) { 231851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Info.Param = makeTemplateParameter( 231951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor const_cast<NamedDecl *>(TemplateParams->getParam(I))); 2320910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2321dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), 2322910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.size())); 232351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor return TDK_SubstitutionFailure; 232451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor } 23251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 232651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // If we get here, we successfully used the default template argument. 232783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 23281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 232983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Form the template argument list from the deduced template arguments. 23301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *DeducedArgumentList 2331910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); 233283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.reset(DeducedArgumentList); 23331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 23341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Substitute the deduced template arguments into the function template 233583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // declaration to produce the function template specialization. 2336d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor DeclContext *Owner = FunctionTemplate->getDeclContext(); 2337d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor if (FunctionTemplate->getFriendObjectKind()) 2338d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor Owner = FunctionTemplate->getLexicalDeclContext(); 233983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Specialization = cast_or_null<FunctionDecl>( 2340d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor SubstDecl(FunctionTemplate->getTemplatedDecl(), Owner, 2341357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor MultiLevelTemplateArgumentList(*DeducedArgumentList))); 234283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (!Specialization) 234383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 23441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2345dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi assert(Specialization->getPrimaryTemplate()->getCanonicalDecl() == 2346f882574cf640d5c8355965e1c486f9d8d8ffcf47Douglas Gregor FunctionTemplate->getCanonicalDecl()); 2347dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 23481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If the template argument list is owned by the function template 234983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // specialization, release it. 2350ec20f46740a59758b12c22108002395bcf5b6f9bDouglas Gregor if (Specialization->getTemplateSpecializationArgs() == DeducedArgumentList && 2351ec20f46740a59758b12c22108002395bcf5b6f9bDouglas Gregor !Trap.hasErrorOccurred()) 235283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.take(); 23531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 235483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // There may have been an error that did not prevent us from constructing a 235583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // declaration. Mark the declaration invalid and return with a substitution 235683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // failure. 235783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (Trap.hasErrorOccurred()) { 235883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Specialization->setInvalidDecl(true); 235983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 236083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 23611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 23629b623639378d53a675921ddfa7316034d571881eDouglas Gregor // If we suppressed any diagnostics while performing template argument 23639b623639378d53a675921ddfa7316034d571881eDouglas Gregor // deduction, and if we haven't already instantiated this declaration, 23649b623639378d53a675921ddfa7316034d571881eDouglas Gregor // keep track of these diagnostics. They'll be emitted if this specialization 23659b623639378d53a675921ddfa7316034d571881eDouglas Gregor // is actually used. 23669b623639378d53a675921ddfa7316034d571881eDouglas Gregor if (Info.diag_begin() != Info.diag_end()) { 23679b623639378d53a675921ddfa7316034d571881eDouglas Gregor llvm::DenseMap<Decl *, llvm::SmallVector<PartialDiagnosticAt, 1> >::iterator 23689b623639378d53a675921ddfa7316034d571881eDouglas Gregor Pos = SuppressedDiagnostics.find(Specialization->getCanonicalDecl()); 23699b623639378d53a675921ddfa7316034d571881eDouglas Gregor if (Pos == SuppressedDiagnostics.end()) 23709b623639378d53a675921ddfa7316034d571881eDouglas Gregor SuppressedDiagnostics[Specialization->getCanonicalDecl()] 23719b623639378d53a675921ddfa7316034d571881eDouglas Gregor .append(Info.diag_begin(), Info.diag_end()); 2372dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 23739b623639378d53a675921ddfa7316034d571881eDouglas Gregor 23741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return TDK_Success; 237583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 237683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 23779c72c6088d591ace8503b842d39448c2040f3033John McCall/// Gets the type of a function for template-argument-deducton 23789c72c6088d591ace8503b842d39448c2040f3033John McCall/// purposes when it's considered as part of an overload set. 2379eff92135d32039c9874dc356f3e93143af6069c1John McCallstatic QualType GetTypeOfFunction(ASTContext &Context, 23809c72c6088d591ace8503b842d39448c2040f3033John McCall const OverloadExpr::FindResult &R, 2381eff92135d32039c9874dc356f3e93143af6069c1John McCall FunctionDecl *Fn) { 2382eff92135d32039c9874dc356f3e93143af6069c1John McCall if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) 23839c72c6088d591ace8503b842d39448c2040f3033John McCall if (Method->isInstance()) { 23849c72c6088d591ace8503b842d39448c2040f3033John McCall // An instance method that's referenced in a form that doesn't 23859c72c6088d591ace8503b842d39448c2040f3033John McCall // look like a member pointer is just invalid. 23869c72c6088d591ace8503b842d39448c2040f3033John McCall if (!R.HasFormOfMemberPointer) return QualType(); 23879c72c6088d591ace8503b842d39448c2040f3033John McCall 2388eff92135d32039c9874dc356f3e93143af6069c1John McCall return Context.getMemberPointerType(Fn->getType(), 2389eff92135d32039c9874dc356f3e93143af6069c1John McCall Context.getTypeDeclType(Method->getParent()).getTypePtr()); 23909c72c6088d591ace8503b842d39448c2040f3033John McCall } 23919c72c6088d591ace8503b842d39448c2040f3033John McCall 23929c72c6088d591ace8503b842d39448c2040f3033John McCall if (!R.IsAddressOfOperand) return Fn->getType(); 2393eff92135d32039c9874dc356f3e93143af6069c1John McCall return Context.getPointerType(Fn->getType()); 2394eff92135d32039c9874dc356f3e93143af6069c1John McCall} 2395eff92135d32039c9874dc356f3e93143af6069c1John McCall 2396eff92135d32039c9874dc356f3e93143af6069c1John McCall/// Apply the deduction rules for overload sets. 2397eff92135d32039c9874dc356f3e93143af6069c1John McCall/// 2398eff92135d32039c9874dc356f3e93143af6069c1John McCall/// \return the null type if this argument should be treated as an 2399eff92135d32039c9874dc356f3e93143af6069c1John McCall/// undeduced context 2400eff92135d32039c9874dc356f3e93143af6069c1John McCallstatic QualType 2401eff92135d32039c9874dc356f3e93143af6069c1John McCallResolveOverloadForDeduction(Sema &S, TemplateParameterList *TemplateParams, 240275f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor Expr *Arg, QualType ParamType, 240375f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor bool ParamWasReference) { 2404dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 24059c72c6088d591ace8503b842d39448c2040f3033John McCall OverloadExpr::FindResult R = OverloadExpr::find(Arg); 2406eff92135d32039c9874dc356f3e93143af6069c1John McCall 24079c72c6088d591ace8503b842d39448c2040f3033John McCall OverloadExpr *Ovl = R.Expression; 2408eff92135d32039c9874dc356f3e93143af6069c1John McCall 240975f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor // C++0x [temp.deduct.call]p4 241075f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor unsigned TDF = 0; 241175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor if (ParamWasReference) 241275f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor TDF |= TDF_ParamWithReferenceType; 241375f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor if (R.IsAddressOfOperand) 241475f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor TDF |= TDF_IgnoreQualifiers; 241575f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor 2416eff92135d32039c9874dc356f3e93143af6069c1John McCall // If there were explicit template arguments, we can only find 2417eff92135d32039c9874dc356f3e93143af6069c1John McCall // something via C++ [temp.arg.explicit]p3, i.e. if the arguments 2418eff92135d32039c9874dc356f3e93143af6069c1John McCall // unambiguously name a full specialization. 24197bb12da2b0749eeebb21854c77877736969e59f2John McCall if (Ovl->hasExplicitTemplateArgs()) { 2420eff92135d32039c9874dc356f3e93143af6069c1John McCall // But we can still look for an explicit specialization. 2421eff92135d32039c9874dc356f3e93143af6069c1John McCall if (FunctionDecl *ExplicitSpec 24227bb12da2b0749eeebb21854c77877736969e59f2John McCall = S.ResolveSingleFunctionTemplateSpecialization(Ovl)) 24239c72c6088d591ace8503b842d39448c2040f3033John McCall return GetTypeOfFunction(S.Context, R, ExplicitSpec); 2424eff92135d32039c9874dc356f3e93143af6069c1John McCall return QualType(); 2425eff92135d32039c9874dc356f3e93143af6069c1John McCall } 2426eff92135d32039c9874dc356f3e93143af6069c1John McCall 2427eff92135d32039c9874dc356f3e93143af6069c1John McCall // C++0x [temp.deduct.call]p6: 2428eff92135d32039c9874dc356f3e93143af6069c1John McCall // When P is a function type, pointer to function type, or pointer 2429eff92135d32039c9874dc356f3e93143af6069c1John McCall // to member function type: 2430eff92135d32039c9874dc356f3e93143af6069c1John McCall 2431eff92135d32039c9874dc356f3e93143af6069c1John McCall if (!ParamType->isFunctionType() && 2432eff92135d32039c9874dc356f3e93143af6069c1John McCall !ParamType->isFunctionPointerType() && 2433eff92135d32039c9874dc356f3e93143af6069c1John McCall !ParamType->isMemberFunctionPointerType()) 2434eff92135d32039c9874dc356f3e93143af6069c1John McCall return QualType(); 2435eff92135d32039c9874dc356f3e93143af6069c1John McCall 2436eff92135d32039c9874dc356f3e93143af6069c1John McCall QualType Match; 24377bb12da2b0749eeebb21854c77877736969e59f2John McCall for (UnresolvedSetIterator I = Ovl->decls_begin(), 24387bb12da2b0749eeebb21854c77877736969e59f2John McCall E = Ovl->decls_end(); I != E; ++I) { 2439eff92135d32039c9874dc356f3e93143af6069c1John McCall NamedDecl *D = (*I)->getUnderlyingDecl(); 2440eff92135d32039c9874dc356f3e93143af6069c1John McCall 2441eff92135d32039c9874dc356f3e93143af6069c1John McCall // - If the argument is an overload set containing one or more 2442eff92135d32039c9874dc356f3e93143af6069c1John McCall // function templates, the parameter is treated as a 2443eff92135d32039c9874dc356f3e93143af6069c1John McCall // non-deduced context. 2444eff92135d32039c9874dc356f3e93143af6069c1John McCall if (isa<FunctionTemplateDecl>(D)) 2445eff92135d32039c9874dc356f3e93143af6069c1John McCall return QualType(); 2446eff92135d32039c9874dc356f3e93143af6069c1John McCall 2447eff92135d32039c9874dc356f3e93143af6069c1John McCall FunctionDecl *Fn = cast<FunctionDecl>(D); 24489c72c6088d591ace8503b842d39448c2040f3033John McCall QualType ArgType = GetTypeOfFunction(S.Context, R, Fn); 24499c72c6088d591ace8503b842d39448c2040f3033John McCall if (ArgType.isNull()) continue; 2450eff92135d32039c9874dc356f3e93143af6069c1John McCall 245175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor // Function-to-pointer conversion. 2452dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (!ParamWasReference && ParamType->isPointerType() && 245375f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor ArgType->isFunctionType()) 245475f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor ArgType = S.Context.getPointerType(ArgType); 2455dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2456eff92135d32039c9874dc356f3e93143af6069c1John McCall // - If the argument is an overload set (not containing function 2457eff92135d32039c9874dc356f3e93143af6069c1John McCall // templates), trial argument deduction is attempted using each 2458eff92135d32039c9874dc356f3e93143af6069c1John McCall // of the members of the set. If deduction succeeds for only one 2459eff92135d32039c9874dc356f3e93143af6069c1John McCall // of the overload set members, that member is used as the 2460eff92135d32039c9874dc356f3e93143af6069c1John McCall // argument value for the deduction. If deduction succeeds for 2461eff92135d32039c9874dc356f3e93143af6069c1John McCall // more than one member of the overload set the parameter is 2462eff92135d32039c9874dc356f3e93143af6069c1John McCall // treated as a non-deduced context. 2463eff92135d32039c9874dc356f3e93143af6069c1John McCall 2464eff92135d32039c9874dc356f3e93143af6069c1John McCall // We do all of this in a fresh context per C++0x [temp.deduct.type]p2: 2465eff92135d32039c9874dc356f3e93143af6069c1John McCall // Type deduction is done independently for each P/A pair, and 2466eff92135d32039c9874dc356f3e93143af6069c1John McCall // the deduced template argument values are then combined. 2467eff92135d32039c9874dc356f3e93143af6069c1John McCall // So we do not reject deductions which were made elsewhere. 2468dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi llvm::SmallVector<DeducedTemplateArgument, 8> 246902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor Deduced(TemplateParams->size()); 24702a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(S.Context, Ovl->getNameLoc()); 2471eff92135d32039c9874dc356f3e93143af6069c1John McCall Sema::TemplateDeductionResult Result 2472a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 2473eff92135d32039c9874dc356f3e93143af6069c1John McCall ParamType, ArgType, 2474eff92135d32039c9874dc356f3e93143af6069c1John McCall Info, Deduced, TDF); 2475eff92135d32039c9874dc356f3e93143af6069c1John McCall if (Result) continue; 2476eff92135d32039c9874dc356f3e93143af6069c1John McCall if (!Match.isNull()) return QualType(); 2477eff92135d32039c9874dc356f3e93143af6069c1John McCall Match = ArgType; 2478eff92135d32039c9874dc356f3e93143af6069c1John McCall } 2479eff92135d32039c9874dc356f3e93143af6069c1John McCall 2480eff92135d32039c9874dc356f3e93143af6069c1John McCall return Match; 2481eff92135d32039c9874dc356f3e93143af6069c1John McCall} 2482eff92135d32039c9874dc356f3e93143af6069c1John McCall 2483dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief Perform the adjustments to the parameter and argument types 2484f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// described in C++ [temp.deduct.call]. 2485f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// 2486f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// \returns true if the caller should not attempt to perform any template 2487f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// argument deduction based on this P/A pair. 2488f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregorstatic bool AdjustFunctionParmAndArgTypesForDeduction(Sema &S, 2489f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TemplateParameterList *TemplateParams, 2490f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType &ParamType, 2491f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType &ArgType, 2492f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg, 2493f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned &TDF) { 2494f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p3: 24950099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // If P is a cv-qualified type, the top level cv-qualifiers of P's type 2496f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // are ignored for type deduction. 2497a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor if (ParamType.hasQualifiers()) 2498a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor ParamType = ParamType.getUnqualifiedType(); 2499f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>(); 2500f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) { 250134b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType PointeeType = ParamRefType->getPointeeType(); 250234b41d939a1328f484511c6002ba2456db879a29Richard Smith 25032ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // [C++0x] If P is an rvalue reference to a cv-unqualified 25042ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // template parameter and the argument is an lvalue, the type 25052ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // "lvalue reference to A" is used in place of A for type 25062ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // deduction. 250734b41d939a1328f484511c6002ba2456db879a29Richard Smith if (isa<RValueReferenceType>(ParamType)) { 250834b41d939a1328f484511c6002ba2456db879a29Richard Smith if (!PointeeType.getQualifiers() && 250934b41d939a1328f484511c6002ba2456db879a29Richard Smith isa<TemplateTypeParmType>(PointeeType) && 25109625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->Classify(S.Context).isLValue() && 25119625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->getType() != S.Context.OverloadTy && 25129625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->getType() != S.Context.BoundMemberTy) 25132ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor ArgType = S.Context.getLValueReferenceType(ArgType); 25142ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor } 25152ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor 2516f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // [...] If P is a reference type, the type referred to by P is used 2517f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // for type deduction. 251834b41d939a1328f484511c6002ba2456db879a29Richard Smith ParamType = PointeeType; 2519f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2520dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2521f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Overload sets usually make this parameter an undeduced 2522f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // context, but there are sometimes special circumstances. 2523f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType == S.Context.OverloadTy) { 2524f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = ResolveOverloadForDeduction(S, TemplateParams, 2525f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Arg, ParamType, 2526f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamRefType != 0); 2527f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType.isNull()) 2528f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return true; 2529f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2530dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2531f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) { 2532f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p3: 2533f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // [...] If P is of the form T&&, where T is a template parameter, and 2534f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the argument is an lvalue, the type A& is used in place of A for 2535f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type deduction. 2536f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType->isRValueReferenceType() && 2537f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamRefType->getAs<TemplateTypeParmType>() && 2538f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Arg->isLValue()) 2539f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getLValueReferenceType(ArgType); 2540f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } else { 2541f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++ [temp.deduct.call]p2: 2542f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // If P is not a reference type: 2543f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If A is an array type, the pointer type produced by the 2544f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // array-to-pointer standard conversion (4.2) is used in place of 2545f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // A for type deduction; otherwise, 2546f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType->isArrayType()) 2547f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getArrayDecayedType(ArgType); 2548f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If A is a function type, the pointer type produced by the 2549f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // function-to-pointer standard conversion (4.3) is used in place 2550f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // of A for type deduction; otherwise, 2551f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else if (ArgType->isFunctionType()) 2552f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getPointerType(ArgType); 2553f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else { 25540099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - If A is a cv-qualified type, the top level cv-qualifiers of A's 2555f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type are ignored for type deduction. 2556a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor ArgType = ArgType.getUnqualifiedType(); 2557f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2558f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2559dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2560f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p4: 2561f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // In general, the deduction process attempts to find template argument 2562f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // values that will make the deduced A identical to A (after the type A 2563f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // is transformed as described above). [...] 2564f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF = TDF_SkipNonDependent; 2565dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2566f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If the original P is a reference type, the deduced A (i.e., the 2567f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type referred to by the reference) can be more cv-qualified than 2568f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the transformed A. 2569f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) 2570f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_ParamWithReferenceType; 2571f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - The transformed A can be another pointer or pointer to member 2572f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type that can be converted to the deduced A via a qualification 2573f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // conversion (4.4). 2574f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType->isPointerType() || ArgType->isMemberPointerType() || 2575f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType->isObjCObjectPointerType()) 2576f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_IgnoreQualifiers; 2577f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If P is a class and P has the form simple-template-id, then the 2578f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // transformed A can be a derived class of the deduced A. Likewise, 2579f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // if P is a pointer to a class of the form simple-template-id, the 2580f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // transformed A can be a pointer to a derived class pointed to by 2581f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the deduced A. 2582f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (isSimpleTemplateIdType(ParamType) || 2583f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor (isa<PointerType>(ParamType) && 2584f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor isSimpleTemplateIdType( 2585f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType->getAs<PointerType>()->getPointeeType()))) 2586f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_DerivedClass; 2587dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2588f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return false; 2589f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor} 2590f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor 2591e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \brief Perform template argument deduction from a function call 2592e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// (C++ [temp.deduct.call]). 2593e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2594e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param FunctionTemplate the function template for which we are performing 2595e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// template argument deduction. 2596e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 259748026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// \param ExplicitTemplateArguments the explicit template arguments provided 259848026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// for this call. 25996db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor/// 2600e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Args the function call arguments 2601e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2602e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param NumArgs the number of arguments in Args 2603e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 260448026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// \param Name the name of the function being called. This is only significant 260548026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// when the function template is a conversion function template, in which 260648026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// case this routine will also perform template argument deduction based on 2607dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// the function to which 260848026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// 2609e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Specialization if template argument deduction was successful, 26101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// this will be set to the function template specialization produced by 2611e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// template argument deduction. 2612e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2613e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Info the argument will be updated to provide additional information 2614e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// about template argument deduction. 2615e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2616e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \returns the result of template argument deduction. 2617e53060fa78ad7e98352049f72787bdb7543e2a48Douglas GregorSema::TemplateDeductionResult 2618e53060fa78ad7e98352049f72787bdb7543e2a48Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 261967714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 2620e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor Expr **Args, unsigned NumArgs, 2621e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor FunctionDecl *&Specialization, 2622e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor TemplateDeductionInfo &Info) { 2623e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 26246db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor 2625e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // C++ [temp.deduct.call]p1: 2626e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // Template argument deduction is done by comparing each function template 2627e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // parameter type (call it P) with the type of the corresponding argument 2628e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // of the call (call it A) as described below. 2629e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor unsigned CheckArgs = NumArgs; 26306db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor if (NumArgs < Function->getMinRequiredArguments()) 2631e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor return TDK_TooFewArguments; 2632e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor else if (NumArgs > Function->getNumParams()) { 26331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *Proto 2634183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Function->getType()->getAs<FunctionProtoType>(); 2635f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (Proto->isTemplateVariadic()) 2636f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor /* Do nothing */; 2637f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else if (Proto->isVariadic()) 2638f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor CheckArgs = Function->getNumParams(); 2639dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi else 2640e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor return TDK_TooManyArguments; 2641e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 26421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 26436db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // The types of the parameters from which we will perform template argument 26446db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // deduction. 26452a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 2646e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor TemplateParameterList *TemplateParams 2647e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor = FunctionTemplate->getTemplateParameters(); 264802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVector<DeducedTemplateArgument, 4> Deduced; 26496db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor llvm::SmallVector<QualType, 4> ParamTypes; 265002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified = 0; 2651d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs) { 265283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionResult Result = 265383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor SubstituteExplicitTemplateArguments(FunctionTemplate, 2654d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall *ExplicitTemplateArgs, 265583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Deduced, 265683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes, 265783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 0, 265883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info); 265983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (Result) 266083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return Result; 266102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 266202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified = Deduced.size(); 26636db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor } else { 26646db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // Just fill in the parameter types from the function declaration. 2665f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) 26666db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor ParamTypes.push_back(Function->getParamDecl(I)->getType()); 26676db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor } 26681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 26696db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // Deduce template arguments from the function parameters. 26701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced.resize(TemplateParams->size()); 2671f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned ArgIdx = 0; 2672dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (unsigned ParamIdx = 0, NumParams = ParamTypes.size(); 2673f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamIdx != NumParams; ++ParamIdx) { 2674f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ParamType = ParamTypes[ParamIdx]; 2675dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2676dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const PackExpansionType *ParamExpansion 2677f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor = dyn_cast<PackExpansionType>(ParamType); 2678f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (!ParamExpansion) { 2679f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Simple case: matching a function parameter to a function argument. 2680f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgIdx >= CheckArgs) 2681f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 2682dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2683f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg = Args[ArgIdx++]; 2684f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ArgType = Arg->getType(); 2685f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned TDF = 0; 2686f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, 2687f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Arg, 2688f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) 2689f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor continue; 2690dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2691f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (TemplateDeductionResult Result 2692f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor = ::DeduceTemplateArguments(*this, TemplateParams, 2693f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Info, Deduced, 2694f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) 2695f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return Result; 26961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2697f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // FIXME: we need to check that the deduced A is the same as A, 2698f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // modulo the various allowed differences. 2699f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor continue; 270075f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor } 2701dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2702f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p1: 2703dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // For a function parameter pack that occurs at the end of the 2704dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter-declaration-list, the type A of each remaining argument of 2705dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the call is compared with the type P of the declarator-id of the 2706dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // function parameter pack. Each comparison deduces template arguments 2707dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // for subsequent positions in the template parameter packs expanded by 27087d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // the function parameter pack. For a function parameter pack that does 2709dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // not occur at the end of the parameter-declaration-list, the type of 27107d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // the parameter pack is a non-deduced context. 27117d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor if (ParamIdx + 1 < NumParams) 27127d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor break; 2713dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2714f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ParamPattern = ParamExpansion->getPattern(); 2715f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor llvm::SmallVector<unsigned, 2> PackIndices; 2716f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor { 2717f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor llvm::BitVector SawIndices(TemplateParams->size()); 2718f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded; 2719f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor collectUnexpandedParameterPacks(ParamPattern, Unexpanded); 2720f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 2721f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned Depth, Index; 2722f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 2723f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 2724f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor SawIndices[Index] = true; 2725f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor PackIndices.push_back(Index); 2726f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2727f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2728f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2729f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 2730dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2731d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Keep track of the deduced template arguments for each parameter pack 2732dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 2733d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template argument (the inner SmallVectors). 2734d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor llvm::SmallVector<llvm::SmallVector<DeducedTemplateArgument, 4>, 2> 2735d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 2736dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi llvm::SmallVector<DeducedTemplateArgument, 2> 2737d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor SavedPacks(PackIndices.size()); 27385429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor PrepareArgumentPackDeduction(*this, Deduced, PackIndices, SavedPacks, 2739dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks); 2740f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor bool HasAnyArguments = false; 2741f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (; ArgIdx < NumArgs; ++ArgIdx) { 2742f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor HasAnyArguments = true; 2743dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2744f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType = ParamPattern; 2745f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg = Args[ArgIdx]; 2746f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ArgType = Arg->getType(); 2747f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned TDF = 0; 2748f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, 2749f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Arg, 2750f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) { 2751f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // We can't actually perform any deduction for this argument, so stop 2752f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // deduction at this point. 2753f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ++ArgIdx; 2754f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 2755f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2756dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2757f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (TemplateDeductionResult Result 2758f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor = ::DeduceTemplateArguments(*this, TemplateParams, 2759f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Info, Deduced, 2760f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) 2761f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return Result; 2762eff92135d32039c9874dc356f3e93143af6069c1John McCall 2763f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 2764f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 2765f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // for that pack, then clear out the deduced argument. 2766f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 2767f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 2768f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (!DeducedArg.isNull()) { 2769f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 2770f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor DeducedArg = DeducedTemplateArgument(); 2771f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2772e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 2773e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 2774dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2775f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 2776f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // pack expansion. 27770216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 2778dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(*this, TemplateParams, HasAnyArguments, 27790216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 27800216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 2781dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 27821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2783f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // After we've matching against a parameter pack, we're done. 2784f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 2785e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 278665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 27871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 278802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified, 278983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Specialization, Info); 279083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 2791127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor 279283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \brief Deduce template arguments when taking the address of a function 27934b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template (C++ [temp.deduct.funcaddr]) or matching a specialization to 27944b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// a template. 279583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 279683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionTemplate the function template for which we are performing 279783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template argument deduction. 279883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 2799dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param ExplicitTemplateArguments the explicitly-specified template 28004b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// arguments. 280183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 280283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param ArgFunctionType the function type that will be used as the 280383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// "argument" type (A) when performing template argument deduction from the 28044b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// function template's function type. This type may be NULL, if there is no 28054b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// argument type to compare against, in C++0x [temp.arg.explicit]p3. 280683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 280783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Specialization if template argument deduction was successful, 28081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// this will be set to the function template specialization produced by 280983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template argument deduction. 281083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 281183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Info the argument will be updated to provide additional information 281283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// about template argument deduction. 281383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 281483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \returns the result of template argument deduction. 281583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::TemplateDeductionResult 281683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 281767714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 281883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType ArgFunctionType, 281983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *&Specialization, 282083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionInfo &Info) { 282183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 282283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 282383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 282483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType FunctionType = Function->getType(); 28251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 282683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Substitute any explicit template arguments. 28272a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 282802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVector<DeducedTemplateArgument, 4> Deduced; 282902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified = 0; 283083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor llvm::SmallVector<QualType, 4> ParamTypes; 2831d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs) { 28321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (TemplateDeductionResult Result 28331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump = SubstituteExplicitTemplateArguments(FunctionTemplate, 2834d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall *ExplicitTemplateArgs, 28351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced, ParamTypes, 283683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor &FunctionType, Info)) 283783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return Result; 283802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 283902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified = Deduced.size(); 2840127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor } 284183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 284283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Template argument deduction for function templates in a SFINAE context. 284383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Trap any errors that might occur. 28441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 28451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2846eff92135d32039c9874dc356f3e93143af6069c1John McCall Deduced.resize(TemplateParams->size()); 2847eff92135d32039c9874dc356f3e93143af6069c1John McCall 28484b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor if (!ArgFunctionType.isNull()) { 28494b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor // Deduce template arguments from the function type. 28504b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor if (TemplateDeductionResult Result 2851a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = ::DeduceTemplateArguments(*this, TemplateParams, 28524b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor FunctionType, ArgFunctionType, Info, 285373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Deduced, TDF_TopLevelParameterTypeList)) 28544b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor return Result; 28554b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor } 2856fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 2857dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (TemplateDeductionResult Result 2858fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 2859fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor NumExplicitlySpecified, 2860fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor Specialization, Info)) 2861fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return Result; 2862fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 2863fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor // If the requested function type does not match the actual type of the 2864fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor // specialization, template argument deduction fails. 2865fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor if (!ArgFunctionType.isNull() && 2866fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor !Context.hasSameType(ArgFunctionType, Specialization->getType())) 2867fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return TDK_NonDeducedMismatch; 2868fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 2869fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return TDK_Success; 2870e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor} 2871e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor 287265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \brief Deduce template arguments for a templated conversion 287365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// function (C++ [temp.deduct.conv]) and, if successful, produce a 287465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// conversion function template specialization. 287565ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::TemplateDeductionResult 287665ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 287765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType ToType, 287865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor CXXConversionDecl *&Specialization, 287965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateDeductionInfo &Info) { 28801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump CXXConversionDecl *Conv 288165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor = cast<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()); 288265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType FromType = Conv->getConversionType(); 288365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 288465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Canonicalize the types for deduction. 288565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType P = Context.getCanonicalType(FromType); 288665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType A = Context.getCanonicalType(ToType); 288765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 28885453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p2: 288965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // If P is a reference type, the type referred to by P is used for 289065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type deduction. 289165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (const ReferenceType *PRef = P->getAs<ReferenceType>()) 289265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = PRef->getPointeeType(); 289365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 28945453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p4: 28955453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // [...] If A is a reference type, the type referred to by A is used 289665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // for type deduction. 289765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (const ReferenceType *ARef = A->getAs<ReferenceType>()) 28985453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor A = ARef->getPointeeType().getUnqualifiedType(); 28995453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++ [temp.deduct.conv]p3: 290065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // 29011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If A is not a reference type: 290265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else { 290365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor assert(!A->isReferenceType() && "Reference types were handled above"); 290465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 290565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is an array type, the pointer type produced by the 29061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // array-to-pointer standard conversion (4.2) is used in place 290765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // of P for type deduction; otherwise, 290865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (P->isArrayType()) 290965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = Context.getArrayDecayedType(P); 291065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is a function type, the pointer type produced by the 291165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // function-to-pointer standard conversion (4.3) is used in 291265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // place of P for type deduction; otherwise, 291365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else if (P->isFunctionType()) 291465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = Context.getPointerType(P); 291565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is a cv-qualified type, the top level cv-qualifiers of 29160099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // P's type are ignored for type deduction. 291765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else 291865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = P.getUnqualifiedType(); 291965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 29205453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p4: 29210099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // If A is a cv-qualified type, the top level cv-qualifiers of A's 29225453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // type are ignored for type deduction. If A is a reference type, the type 29235453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // referred to by A is used for type deduction. 292465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor A = A.getUnqualifiedType(); 292565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor } 292665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 292765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Template argument deduction for function templates in a SFINAE context. 292865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Trap any errors that might occur. 29291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 293065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 293165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // C++ [temp.deduct.conv]p1: 293265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Template argument deduction is done by comparing the return 293365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type of the template conversion function (call it P) with the 293465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type that is required as the result of the conversion (call it 293565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // A) as described in 14.8.2.4. 293665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateParameterList *TemplateParams 293765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor = FunctionTemplate->getTemplateParameters(); 293802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVector<DeducedTemplateArgument, 4> Deduced; 29391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced.resize(TemplateParams->size()); 294065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 294165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // C++0x [temp.deduct.conv]p4: 294265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // In general, the deduction process attempts to find template 294365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // argument values that will make the deduced A identical to 294465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // A. However, there are two cases that allow a difference: 294565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor unsigned TDF = 0; 294665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If the original A is a reference type, A can be more 294765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // cv-qualified than the deduced A (i.e., the type referred to 294865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // by the reference) 294965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (ToType->isReferenceType()) 295065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TDF |= TDF_ParamWithReferenceType; 295165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - The deduced A can be another pointer or pointer to member 29520099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // type that can be converted to A via a qualification 295365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // conversion. 295465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // 295565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // (C++0x [temp.deduct.conv]p6 clarifies that this only happens when 295665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // both P and A are pointers or member pointers. In this case, we 295765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // just ignore cv-qualifiers completely). 295865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if ((P->isPointerType() && A->isPointerType()) || 295965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor (P->isMemberPointerType() && P->isMemberPointerType())) 296065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TDF |= TDF_IgnoreQualifiers; 296165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (TemplateDeductionResult Result 2962a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = ::DeduceTemplateArguments(*this, TemplateParams, 296365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P, A, Info, Deduced, TDF)) 296465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return Result; 296565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 296665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // FIXME: we need to check that the deduced A is the same as A, 296765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // modulo the various allowed differences. 29681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 296965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Finish template argument deduction. 29702a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 297165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor FunctionDecl *Spec = 0; 297265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateDeductionResult Result 2973dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 0, Spec, 297402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor Info); 297565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor Specialization = cast_or_null<CXXConversionDecl>(Spec); 297665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return Result; 297765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor} 297865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 29794b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \brief Deduce template arguments for a function template when there is 29804b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// nothing to deduce against (C++0x [temp.arg.explicit]p3). 29814b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 29824b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param FunctionTemplate the function template for which we are performing 29834b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template argument deduction. 29844b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 2985dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param ExplicitTemplateArguments the explicitly-specified template 29864b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// arguments. 29874b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 29884b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param Specialization if template argument deduction was successful, 29894b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// this will be set to the function template specialization produced by 29904b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template argument deduction. 29914b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 29924b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param Info the argument will be updated to provide additional information 29934b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// about template argument deduction. 29944b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 29954b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \returns the result of template argument deduction. 29964b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas GregorSema::TemplateDeductionResult 29974b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 299867714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 29994b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor FunctionDecl *&Specialization, 30004b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor TemplateDeductionInfo &Info) { 30014b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor return DeduceTemplateArguments(FunctionTemplate, ExplicitTemplateArgs, 30024b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor QualType(), Specialization, Info); 30034b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor} 30044b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor 300534b41d939a1328f484511c6002ba2456db879a29Richard Smithnamespace { 300634b41d939a1328f484511c6002ba2456db879a29Richard Smith /// Substitute the 'auto' type specifier within a type for a given replacement 300734b41d939a1328f484511c6002ba2456db879a29Richard Smith /// type. 300834b41d939a1328f484511c6002ba2456db879a29Richard Smith class SubstituteAutoTransform : 300934b41d939a1328f484511c6002ba2456db879a29Richard Smith public TreeTransform<SubstituteAutoTransform> { 301034b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Replacement; 301134b41d939a1328f484511c6002ba2456db879a29Richard Smith public: 301234b41d939a1328f484511c6002ba2456db879a29Richard Smith SubstituteAutoTransform(Sema &SemaRef, QualType Replacement) : 301334b41d939a1328f484511c6002ba2456db879a29Richard Smith TreeTransform<SubstituteAutoTransform>(SemaRef), Replacement(Replacement) { 301434b41d939a1328f484511c6002ba2456db879a29Richard Smith } 301534b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType TransformAutoType(TypeLocBuilder &TLB, AutoTypeLoc TL) { 301634b41d939a1328f484511c6002ba2456db879a29Richard Smith // If we're building the type pattern to deduce against, don't wrap the 301734b41d939a1328f484511c6002ba2456db879a29Richard Smith // substituted type in an AutoType. Certain template deduction rules 301834b41d939a1328f484511c6002ba2456db879a29Richard Smith // apply only when a template type parameter appears directly (and not if 301934b41d939a1328f484511c6002ba2456db879a29Richard Smith // the parameter is found through desugaring). For instance: 302034b41d939a1328f484511c6002ba2456db879a29Richard Smith // auto &&lref = lvalue; 302134b41d939a1328f484511c6002ba2456db879a29Richard Smith // must transform into "rvalue reference to T" not "rvalue reference to 302234b41d939a1328f484511c6002ba2456db879a29Richard Smith // auto type deduced as T" in order for [temp.deduct.call]p3 to apply. 302334b41d939a1328f484511c6002ba2456db879a29Richard Smith if (isa<TemplateTypeParmType>(Replacement)) { 302434b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Result = Replacement; 302534b41d939a1328f484511c6002ba2456db879a29Richard Smith TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result); 302634b41d939a1328f484511c6002ba2456db879a29Richard Smith NewTL.setNameLoc(TL.getNameLoc()); 302734b41d939a1328f484511c6002ba2456db879a29Richard Smith return Result; 302834b41d939a1328f484511c6002ba2456db879a29Richard Smith } else { 302934b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Result = RebuildAutoType(Replacement); 303034b41d939a1328f484511c6002ba2456db879a29Richard Smith AutoTypeLoc NewTL = TLB.push<AutoTypeLoc>(Result); 303134b41d939a1328f484511c6002ba2456db879a29Richard Smith NewTL.setNameLoc(TL.getNameLoc()); 303234b41d939a1328f484511c6002ba2456db879a29Richard Smith return Result; 303334b41d939a1328f484511c6002ba2456db879a29Richard Smith } 303434b41d939a1328f484511c6002ba2456db879a29Richard Smith } 303534b41d939a1328f484511c6002ba2456db879a29Richard Smith }; 303634b41d939a1328f484511c6002ba2456db879a29Richard Smith} 303734b41d939a1328f484511c6002ba2456db879a29Richard Smith 303834b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \brief Deduce the type for an auto type-specifier (C++0x [dcl.spec.auto]p6) 303934b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 304034b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Type the type pattern using the auto type-specifier. 304134b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 304234b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Init the initializer for the variable whose type is to be deduced. 304334b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 304434b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Result if type deduction was successful, this will be set to the 304534b41d939a1328f484511c6002ba2456db879a29Richard Smith/// deduced type. This may still contain undeduced autos if the type is 3046a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// dependent. This will be set to null if deduction succeeded, but auto 3047a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// substitution failed; the appropriate diagnostic will already have been 3048a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// produced in that case. 304934b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 305034b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \returns true if deduction succeeded, false if it failed. 305134b41d939a1328f484511c6002ba2456db879a29Richard Smithbool 3052a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard SmithSema::DeduceAutoType(TypeSourceInfo *Type, Expr *Init, 3053a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith TypeSourceInfo *&Result) { 305434b41d939a1328f484511c6002ba2456db879a29Richard Smith if (Init->isTypeDependent()) { 305534b41d939a1328f484511c6002ba2456db879a29Richard Smith Result = Type; 305634b41d939a1328f484511c6002ba2456db879a29Richard Smith return true; 305734b41d939a1328f484511c6002ba2456db879a29Richard Smith } 305834b41d939a1328f484511c6002ba2456db879a29Richard Smith 305934b41d939a1328f484511c6002ba2456db879a29Richard Smith SourceLocation Loc = Init->getExprLoc(); 306034b41d939a1328f484511c6002ba2456db879a29Richard Smith 306134b41d939a1328f484511c6002ba2456db879a29Richard Smith LocalInstantiationScope InstScope(*this); 306234b41d939a1328f484511c6002ba2456db879a29Richard Smith 306334b41d939a1328f484511c6002ba2456db879a29Richard Smith // Build template<class TemplParam> void Func(FuncParam); 30644fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth TemplateTypeParmDecl *TemplParam = 30654fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth TemplateTypeParmDecl::Create(Context, 0, SourceLocation(), Loc, 0, 0, 0, 30664fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth false, false); 30674fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth QualType TemplArg = QualType(TemplParam->getTypeForDecl(), 0); 30684fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth NamedDecl *TemplParamPtr = TemplParam; 3069483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith FixedSizeTemplateParameterList<1> TemplateParams(Loc, Loc, &TemplParamPtr, 3070483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith Loc); 3071483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith 3072a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith TypeSourceInfo *FuncParamInfo = 307334b41d939a1328f484511c6002ba2456db879a29Richard Smith SubstituteAutoTransform(*this, TemplArg).TransformType(Type); 3074a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith assert(FuncParamInfo && "substituting template parameter for 'auto' failed"); 3075a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith QualType FuncParam = FuncParamInfo->getType(); 307634b41d939a1328f484511c6002ba2456db879a29Richard Smith 307734b41d939a1328f484511c6002ba2456db879a29Richard Smith // Deduce type of TemplParam in Func(Init) 307834b41d939a1328f484511c6002ba2456db879a29Richard Smith llvm::SmallVector<DeducedTemplateArgument, 1> Deduced; 307934b41d939a1328f484511c6002ba2456db879a29Richard Smith Deduced.resize(1); 308034b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType InitType = Init->getType(); 308134b41d939a1328f484511c6002ba2456db879a29Richard Smith unsigned TDF = 0; 3082483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith if (AdjustFunctionParmAndArgTypesForDeduction(*this, &TemplateParams, 308334b41d939a1328f484511c6002ba2456db879a29Richard Smith FuncParam, InitType, Init, 308434b41d939a1328f484511c6002ba2456db879a29Richard Smith TDF)) 308534b41d939a1328f484511c6002ba2456db879a29Richard Smith return false; 308634b41d939a1328f484511c6002ba2456db879a29Richard Smith 308734b41d939a1328f484511c6002ba2456db879a29Richard Smith TemplateDeductionInfo Info(Context, Loc); 3088483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith if (::DeduceTemplateArguments(*this, &TemplateParams, 308934b41d939a1328f484511c6002ba2456db879a29Richard Smith FuncParam, InitType, Info, Deduced, 309034b41d939a1328f484511c6002ba2456db879a29Richard Smith TDF)) 309134b41d939a1328f484511c6002ba2456db879a29Richard Smith return false; 309234b41d939a1328f484511c6002ba2456db879a29Richard Smith 309334b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType DeducedType = Deduced[0].getAsType(); 309434b41d939a1328f484511c6002ba2456db879a29Richard Smith if (DeducedType.isNull()) 309534b41d939a1328f484511c6002ba2456db879a29Richard Smith return false; 309634b41d939a1328f484511c6002ba2456db879a29Richard Smith 309734b41d939a1328f484511c6002ba2456db879a29Richard Smith Result = SubstituteAutoTransform(*this, DeducedType).TransformType(Type); 309834b41d939a1328f484511c6002ba2456db879a29Richard Smith return true; 309934b41d939a1328f484511c6002ba2456db879a29Richard Smith} 310034b41d939a1328f484511c6002ba2456db879a29Richard Smith 31018a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregorstatic void 3102e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, QualType T, 3103e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3104ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Level, 3105e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor llvm::SmallVectorImpl<bool> &Deduced); 3106dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3107dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief If this is a non-static member function, 310877bc572138543ef97ebec137522b763d6a6ee909Douglas Gregorstatic void MaybeAddImplicitObjectParameterType(ASTContext &Context, 310977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor CXXMethodDecl *Method, 311077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor llvm::SmallVectorImpl<QualType> &ArgTypes) { 311177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor if (Method->isStatic()) 311277bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor return; 311377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 311477bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // C++ [over.match.funcs]p4: 311577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // 311677bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // For non-static member functions, the type of the implicit 311777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // object parameter is 31180099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - "lvalue reference to cv X" for functions declared without a 311977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // ref-qualifier or with the & ref-qualifier 312077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // - "rvalue reference to cv X" for functions declared with the 312177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // && ref-qualifier 312277bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // 312377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // FIXME: We don't have ref-qualifiers yet, so we don't do that part. 312477bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor QualType ArgTy = Context.getTypeDeclType(Method->getParent()); 312577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTy = Context.getQualifiedType(ArgTy, 312677bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor Qualifiers::fromCVRMask(Method->getTypeQualifiers())); 312777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTy = Context.getLValueReferenceType(ArgTy); 312877bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTypes.push_back(ArgTy); 312977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor} 313077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 31318a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// \brief Determine whether the function template \p FT1 is at least as 31328a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// specialized as \p FT2. 31338a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregorstatic bool isAtLeastAsSpecializedAs(Sema &S, 31345769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc, 31358a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionTemplateDecl *FT1, 31368a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionTemplateDecl *FT2, 31378a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor TemplatePartialOrderingContext TPOC, 3138dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned NumCallArguments, 3139b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor llvm::SmallVectorImpl<RefParamPartialOrderingComparison> *RefParamComparisons) { 31408a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionDecl *FD1 = FT1->getTemplatedDecl(); 3141dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionDecl *FD2 = FT2->getTemplatedDecl(); 31428a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor const FunctionProtoType *Proto1 = FD1->getType()->getAs<FunctionProtoType>(); 31438a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor const FunctionProtoType *Proto2 = FD2->getType()->getAs<FunctionProtoType>(); 3144dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 31458a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor assert(Proto1 && Proto2 && "Function templates must have prototypes"); 31468a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor TemplateParameterList *TemplateParams = FT2->getTemplateParameters(); 314702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVector<DeducedTemplateArgument, 4> Deduced; 31488a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Deduced.resize(TemplateParams->size()); 31498a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 31508a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p3: 31518a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // The types used to determine the ordering depend on the context in which 31528a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // the partial ordering is done: 31532a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(S.Context, Loc); 31548d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor CXXMethodDecl *Method1 = 0; 31558d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor CXXMethodDecl *Method2 = 0; 31568d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor bool IsNonStatic2 = false; 31578d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor bool IsNonStatic1 = false; 31588d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor unsigned Skip2 = 0; 31598a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor switch (TPOC) { 31608a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Call: { 31618a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // - In the context of a function call, the function parameter types are 31628a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // used. 31638d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Method1 = dyn_cast<CXXMethodDecl>(FD1); 31648d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Method2 = dyn_cast<CXXMethodDecl>(FD2); 31658d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic1 = Method1 && !Method1->isStatic(); 31668d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic2 = Method2 && !Method2->isStatic(); 31678d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor 31688d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // C++0x [temp.func.order]p3: 31698d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // [...] If only one of the function templates is a non-static 31708d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // member, that function template is considered to have a new 31718d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // first parameter inserted in its function parameter list. The 31728d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // new parameter is of type "reference to cv A," where cv are 31738d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // the cv-qualifiers of the function template (if any) and A is 31748d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // the class of which the function template is a member. 31758d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // 31768d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // C++98/03 doesn't have this provision, so instead we drop the 31778d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // first argument of the free function or static member, which 31788d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // seems to match existing practice. 317977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor llvm::SmallVector<QualType, 4> Args1; 3180dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned Skip1 = !S.getLangOptions().CPlusPlus0x && 31818d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic2 && !IsNonStatic1; 31828d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor if (S.getLangOptions().CPlusPlus0x && IsNonStatic1 && !IsNonStatic2) 3183dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MaybeAddImplicitObjectParameterType(S.Context, Method1, Args1); 3184dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Args1.insert(Args1.end(), 31858d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Proto1->arg_type_begin() + Skip1, Proto1->arg_type_end()); 318677bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 318777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor llvm::SmallVector<QualType, 4> Args2; 3188dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Skip2 = !S.getLangOptions().CPlusPlus0x && 31898d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic1 && !IsNonStatic2; 31908d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor if (S.getLangOptions().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) 319177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor MaybeAddImplicitObjectParameterType(S.Context, Method2, Args2); 3192dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Args2.insert(Args2.end(), 31938d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Proto2->arg_type_begin() + Skip2, Proto2->arg_type_end()); 3194dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 31955c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++ [temp.func.order]p5: 31965c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // The presence of unused ellipsis and default arguments has no effect on 31975c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // the partial ordering of function templates. 31985c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (Args1.size() > NumCallArguments) 31995c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args1.resize(NumCallArguments); 32005c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (Args2.size() > NumCallArguments) 32015c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args2.resize(NumCallArguments); 32025c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (DeduceTemplateArguments(S, TemplateParams, Args2.data(), Args2.size(), 32035c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args1.data(), Args1.size(), Info, Deduced, 32045c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TDF_None, /*PartialOrdering=*/true, 3205b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons)) 32068a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 3207dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32088a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 32098a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3210dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32118a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Conversion: 32128a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // - In the context of a call to a conversion operator, the return types 32138a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // of the conversion function templates are used. 32145c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (DeduceTemplateArguments(S, TemplateParams, Proto2->getResultType(), 32155c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Proto1->getResultType(), Info, Deduced, 32165c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TDF_None, /*PartialOrdering=*/true, 3217b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons)) 32188a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 32198a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 3220dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32218a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Other: 32220099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - In other contexts (14.6.6.2) the function template's function type 32238a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // is used. 32245c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // FIXME: Don't we actually want to perform the adjustments on the parameter 32255c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // types? 3226dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (DeduceTemplateArguments(S, TemplateParams, FD2->getType(), 32275c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor FD1->getType(), Info, Deduced, TDF_None, 3228b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*PartialOrdering=*/true, RefParamComparisons)) 32298a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 32308a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 32318a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3232dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32338a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p11: 3234dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // In most cases, all template parameters must have values in order for 3235dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // deduction to succeed, but for partial ordering purposes a template 3236dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter may remain without a value provided it is not used in the 32378a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // types being used for partial ordering. [ Note: a template parameter used 32388a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // in a non-deduced context is considered used. -end note] 32398a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor unsigned ArgIdx = 0, NumArgs = Deduced.size(); 32408a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor for (; ArgIdx != NumArgs; ++ArgIdx) 32418a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Deduced[ArgIdx].isNull()) 32428a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 32438a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 32448a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (ArgIdx == NumArgs) { 3245dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // All template arguments were deduced. FT1 is at least as specialized 32468a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // as FT2. 32478a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return true; 32488a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 32498a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 3250e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // Figure out which template parameters were used. 32518a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor llvm::SmallVector<bool, 4> UsedParameters; 32528a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor UsedParameters.resize(TemplateParams->size()); 32538a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor switch (TPOC) { 32548a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Call: { 3255dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned NumParams = std::min(NumCallArguments, 3256dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi std::min(Proto1->getNumArgs(), 32575c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Proto2->getNumArgs())); 32588d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor if (S.getLangOptions().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) 3259dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(S, Method2->getThisType(S.Context), false, 32608d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor TemplateParams->getDepth(), UsedParameters); 32618d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor for (unsigned I = Skip2; I < NumParams; ++I) 3262dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(S, Proto2->getArgType(I), false, 3263ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3264e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor UsedParameters); 32658a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 32668a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3267dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32688a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Conversion: 3269dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(S, Proto2->getResultType(), false, 3270ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3271e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor UsedParameters); 32728a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 3273dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32748a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Other: 3275dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(S, FD2->getType(), false, 3276ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3277ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor UsedParameters); 32788a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 32798a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3280dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32818a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor for (; ArgIdx != NumArgs; ++ArgIdx) 32828a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // If this argument had no value deduced but was used in one of the types 32838a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // used for partial ordering, then deduction fails. 32848a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Deduced[ArgIdx].isNull() && UsedParameters[ArgIdx]) 32858a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 3286dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32878a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return true; 32888a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor} 3289dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32909da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor/// \brief Determine whether this a function template whose parameter-type-list 32919da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor/// ends with a function parameter pack. 32929da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregorstatic bool isVariadicFunctionTemplate(FunctionTemplateDecl *FunTmpl) { 32939da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor FunctionDecl *Function = FunTmpl->getTemplatedDecl(); 32949da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor unsigned NumParams = Function->getNumParams(); 32959da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (NumParams == 0) 32969da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 3297dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 32989da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor ParmVarDecl *Last = Function->getParamDecl(NumParams - 1); 32999da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (!Last->isParameterPack()) 33009da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 3301dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 33029da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // Make sure that no previous parameter is a parameter pack. 33039da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor while (--NumParams > 0) { 33049da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (Function->getParamDecl(NumParams - 1)->isParameterPack()) 33059da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 33069da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor } 3307dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 33089da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return true; 33099da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor} 3310dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3311bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \brief Returns the more specialized function template according 331265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// to the rules of function template partial ordering (C++ [temp.func.order]). 331365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 331465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \param FT1 the first function template 331565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 331665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \param FT2 the second function template 331765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 33188a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// \param TPOC the context in which we are performing partial ordering of 33198a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// function templates. 33201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// 33215c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param NumCallArguments The number of arguments in a call, used only 33225c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// when \c TPOC is \c TPOC_Call. 33235c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 3324bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \returns the more specialized function template. If neither 332565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// template is more specialized, returns NULL. 332665ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorFunctionTemplateDecl * 332765ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::getMoreSpecializedTemplate(FunctionTemplateDecl *FT1, 332865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor FunctionTemplateDecl *FT2, 33295769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc, 33305c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TemplatePartialOrderingContext TPOC, 33315c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned NumCallArguments) { 3332b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor llvm::SmallVector<RefParamPartialOrderingComparison, 4> RefParamComparisons; 3333dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi bool Better1 = isAtLeastAsSpecializedAs(*this, Loc, FT1, FT2, TPOC, 33345c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor NumCallArguments, 0); 3335dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi bool Better2 = isAtLeastAsSpecializedAs(*this, Loc, FT2, FT1, TPOC, 33365c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor NumCallArguments, 3337b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor &RefParamComparisons); 3338dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 33398a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Better1 != Better2) // We have a clear winner 33408a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return Better1? FT1 : FT2; 3341dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 33428a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (!Better1 && !Better2) // Neither is better than the other 334365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return 0; 33448a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 33458a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p10: 3346dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If for each type being considered a given template is at least as 33478a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized for all types and more specialized for some set of types and 3348dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the other template is not more specialized for any types or is not at 33498a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // least as specialized for any types, then the given template is more 33508a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized than the other template. Otherwise, neither template is more 33518a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized than the other. 33528a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Better1 = false; 33538a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Better2 = false; 3354b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor for (unsigned I = 0, N = RefParamComparisons.size(); I != N; ++I) { 33558a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p9: 33568a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // If, for a given type, deduction succeeds in both directions (i.e., the 3357b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // types are identical after the transformations above) and both P and A 3358b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // were reference types (before being replaced with the type referred to 3359b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // above): 3360b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 3361dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // -- if the type from the argument template was an lvalue reference 3362b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // and the type from the parameter template was not, the argument 3363b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // type is considered to be more specialized than the other; 3364b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // otherwise, 3365b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (!RefParamComparisons[I].ArgIsRvalueRef && 3366b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons[I].ParamIsRvalueRef) { 3367b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better2 = true; 3368b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better1) 3369b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3370b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3371b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor } else if (!RefParamComparisons[I].ParamIsRvalueRef && 3372b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons[I].ArgIsRvalueRef) { 3373b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better1 = true; 3374b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better2) 3375b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3376b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3377b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor } 3378dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3379b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // -- if the type from the argument template is more cv-qualified than 3380b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // the type from the parameter template (as described above), the 3381b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // argument type is considered to be more specialized than the 3382b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // other; otherwise, 3383b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor switch (RefParamComparisons[I].Qualifiers) { 3384b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case NeitherMoreQualified: 3385b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor break; 3386dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3387b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case ParamMoreQualified: 3388b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better1 = true; 3389b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better2) 3390b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3391b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3392dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3393b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case ArgMoreQualified: 3394b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better2 = true; 3395b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better1) 3396b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3397b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 33988a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3399dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3400b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // -- neither type is more specialized than the other. 34018a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3402dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 34038a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor assert(!(Better1 && Better2) && "Should have broken out in the loop above"); 340465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (Better1) 340565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return FT1; 34068a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor else if (Better2) 34078a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return FT2; 3408dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 34099da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // FIXME: This mimics what GCC implements, but doesn't match up with the 34109da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // proposed resolution for core issue 692. This area needs to be sorted out, 34119da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // but for now we attempt to maintain compatibility. 34129da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor bool Variadic1 = isVariadicFunctionTemplate(FT1); 34139da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor bool Variadic2 = isVariadicFunctionTemplate(FT2); 34149da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (Variadic1 != Variadic2) 34159da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return Variadic1? FT2 : FT1; 3416dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 34179da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return 0; 341865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor} 341983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 3420d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \brief Determine if the two templates are equivalent. 3421d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregorstatic bool isSameTemplate(TemplateDecl *T1, TemplateDecl *T2) { 3422d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (T1 == T2) 3423d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return true; 3424dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3425d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (!T1 || !T2) 3426d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return false; 3427dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3428d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return T1->getCanonicalDecl() == T2->getCanonicalDecl(); 3429d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor} 3430d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor 3431d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \brief Retrieve the most specialized of the given function template 3432d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specializations. 3433d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3434c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// \param SpecBegin the start iterator of the function template 3435c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// specializations that we will be comparing. 3436d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3437c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// \param SpecEnd the end iterator of the function template 3438c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// specializations, paired with \p SpecBegin. 3439d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3440d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param TPOC the partial ordering context to use to compare the function 3441d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// template specializations. 3442d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 34435c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param NumCallArguments The number of arguments in a call, used only 34445c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// when \c TPOC is \c TPOC_Call. 34455c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 3446dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param Loc the location where the ambiguity or no-specializations 3447d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// diagnostic should occur. 3448d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3449d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param NoneDiag partial diagnostic used to diagnose cases where there are 3450d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// no matching candidates. 3451d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3452d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param AmbigDiag partial diagnostic used to diagnose an ambiguity, if one 3453d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// occurs. 3454d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3455d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param CandidateDiag partial diagnostic used for each function template 3456d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specialization that is a candidate in the ambiguous ordering. One parameter 3457d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// in this diagnostic should be unbound, which will correspond to the string 3458d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// describing the template arguments for the function template specialization. 3459d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3460dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param Index if non-NULL and the result of this function is non-nULL, 3461d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// receives the index corresponding to the resulting function template 3462d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specialization. 3463d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3464dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \returns the most specialized function template specialization, if 3465c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// found. Otherwise, returns SpecEnd. 3466d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3467dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \todo FIXME: Consider passing in the "also-ran" candidates that failed 3468d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// template argument deduction. 3469c373d48502ca7683ab55385f5bd624d778eb288dJohn McCallUnresolvedSetIterator 3470c373d48502ca7683ab55385f5bd624d778eb288dJohn McCallSema::getMostSpecialized(UnresolvedSetIterator SpecBegin, 34715c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor UnresolvedSetIterator SpecEnd, 3472c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall TemplatePartialOrderingContext TPOC, 34735c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned NumCallArguments, 3474c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall SourceLocation Loc, 3475c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall const PartialDiagnostic &NoneDiag, 3476c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall const PartialDiagnostic &AmbigDiag, 34771be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor const PartialDiagnostic &CandidateDiag, 34781be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor bool Complain) { 3479c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall if (SpecBegin == SpecEnd) { 34801be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 34811be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag(Loc, NoneDiag); 3482c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecEnd; 3483d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3484dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3485dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (SpecBegin + 1 == SpecEnd) 3486c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecBegin; 3487dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3488d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Find the function template that is better than all of the templates it 3489d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // has been compared to. 3490c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall UnresolvedSetIterator Best = SpecBegin; 3491dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionTemplateDecl *BestTemplate 3492c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*Best)->getPrimaryTemplate(); 3493d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor assert(BestTemplate && "Not a function template specialization?"); 3494c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall for (UnresolvedSetIterator I = SpecBegin + 1; I != SpecEnd; ++I) { 3495c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall FunctionTemplateDecl *Challenger 3496c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*I)->getPrimaryTemplate(); 3497d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor assert(Challenger && "Not a function template specialization?"); 3498c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall if (isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, 34995c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Loc, TPOC, NumCallArguments), 3500d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Challenger)) { 3501d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Best = I; 3502d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor BestTemplate = Challenger; 3503d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3504d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3505dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3506d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Make sure that the "best" function template is more specialized than all 3507d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // of the others. 3508d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor bool Ambiguous = false; 3509c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { 3510c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall FunctionTemplateDecl *Challenger 3511c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*I)->getPrimaryTemplate(); 3512d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (I != Best && 3513dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi !isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, 35145c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Loc, TPOC, NumCallArguments), 3515d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor BestTemplate)) { 3516d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Ambiguous = true; 3517d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor break; 3518d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3519d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3520dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3521d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (!Ambiguous) { 3522d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // We found an answer. Return it. 3523c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return Best; 3524d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3525dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3526d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Diagnose the ambiguity. 35271be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 35281be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag(Loc, AmbigDiag); 3529dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35301be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 3531d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // FIXME: Can we order the candidates in some sane way? 35321be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) 35331be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag((*I)->getLocation(), CandidateDiag) 35341be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor << getTemplateArgumentBindingsText( 35351be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor cast<FunctionDecl>(*I)->getPrimaryTemplate()->getTemplateParameters(), 3536c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall *cast<FunctionDecl>(*I)->getTemplateSpecializationArgs()); 3537dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3538c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecEnd; 3539d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor} 3540d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor 3541bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \brief Returns the more specialized class template partial specialization 3542bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// according to the rules of partial ordering of class template partial 3543bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// specializations (C++ [temp.class.order]). 3544bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 3545bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \param PS1 the first class template partial specialization 3546bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 3547bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \param PS2 the second class template partial specialization 3548bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 3549bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \returns the more specialized class template partial specialization. If 3550bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// neither partial specialization is more specialized, returns NULL. 3551bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas GregorClassTemplatePartialSpecializationDecl * 3552bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas GregorSema::getMoreSpecializedPartialSpecialization( 3553bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor ClassTemplatePartialSpecializationDecl *PS1, 35545769d6195087229770d7ac90449443e026c47103John McCall ClassTemplatePartialSpecializationDecl *PS2, 35555769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc) { 3556bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // C++ [temp.class.order]p1: 3557bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // For two class template partial specializations, the first is at least as 3558dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // specialized as the second if, given the following rewrite to two 3559dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // function templates, the first function template is at least as 3560dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // specialized as the second according to the ordering rules for function 3561bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // templates (14.6.6.2): 3562bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // - the first function template has the same template parameters as the 3563dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // first partial specialization and has a single function parameter 3564dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // whose type is a class template specialization with the template 3565bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // arguments of the first partial specialization, and 3566bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // - the second function template has the same template parameters as the 3567dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // second partial specialization and has a single function parameter 3568dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // whose type is a class template specialization with the template 3569bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // arguments of the second partial specialization. 3570bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // 357131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // Rather than synthesize function templates, we merely perform the 357231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // equivalent partial ordering by performing deduction directly on 357331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // the template arguments of the class template partial 357431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // specializations. This computation is slightly simpler than the 357531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // general problem of function template partial ordering, because 357631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // class template partial specializations are more constrained. We 357731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // know that every template parameter is deducible from the class 357831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // template partial specialization's template arguments, for 357931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // example. 358002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVector<DeducedTemplateArgument, 4> Deduced; 35812a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(Context, Loc); 358231f17ecbef57b5679c017c375db330546b7b5145John McCall 358331f17ecbef57b5679c017c375db330546b7b5145John McCall QualType PT1 = PS1->getInjectedSpecializationType(); 358431f17ecbef57b5679c017c375db330546b7b5145John McCall QualType PT2 = PS2->getInjectedSpecializationType(); 3585dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3586bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // Determine whether PS1 is at least as specialized as PS2 3587bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor Deduced.resize(PS2->getTemplateParameters()->size()); 35885c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool Better1 = !::DeduceTemplateArguments(*this, PS2->getTemplateParameters(), 35895c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PT2, PT1, Info, Deduced, TDF_None, 3590dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi /*PartialOrdering=*/true, 3591b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*RefParamComparisons=*/0); 35922c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis if (Better1) { 35932c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis InstantiatingTemplate Inst(*this, PS2->getLocation(), PS2, 35942c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis Deduced.data(), Deduced.size(), Info); 3595dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Better1 = !::FinishTemplateArgumentDeduction(*this, PS2, 3596dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PS1->getTemplateArgs(), 3597516e6e09821a61e8975c787e189949723249e7c5Douglas Gregor Deduced, Info); 35982c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis } 3599dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3600bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // Determine whether PS2 is at least as specialized as PS1 3601db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Deduced.clear(); 3602bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor Deduced.resize(PS1->getTemplateParameters()->size()); 36035c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool Better2 = !::DeduceTemplateArguments(*this, PS1->getTemplateParameters(), 36045c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PT1, PT2, Info, Deduced, TDF_None, 36055c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor /*PartialOrdering=*/true, 3606b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*RefParamComparisons=*/0); 36072c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis if (Better2) { 36082c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis InstantiatingTemplate Inst(*this, PS1->getLocation(), PS1, 36092c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis Deduced.data(), Deduced.size(), Info); 3610dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Better2 = !::FinishTemplateArgumentDeduction(*this, PS1, 3611dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PS2->getTemplateArgs(), 3612516e6e09821a61e8975c787e189949723249e7c5Douglas Gregor Deduced, Info); 36132c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis } 3614dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3615bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor if (Better1 == Better2) 3616bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor return 0; 3617dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3618bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor return Better1? PS1 : PS2; 3619bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor} 3620bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor 36211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 3622e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 3623e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const TemplateArgument &TemplateArg, 3624e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3625ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 3626e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor llvm::SmallVectorImpl<bool> &Used); 3627031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3628e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 3629031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// expression. 36301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 3631e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 3632e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const Expr *E, 3633e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3634ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 3635e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor llvm::SmallVectorImpl<bool> &Used) { 3636be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor // We can deduce from a pack expansion. 3637be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor if (const PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(E)) 3638be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor E = Expansion->getPattern(); 3639dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 364054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Skip through any implicit casts we added while type-checking. 364154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 364254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor E = ICE->getSubExpr(); 3643dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3644dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // FIXME: if !OnlyDeduced, we have to walk the whole subexpression to 3645e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // find other occurrences of template parameters. 3646f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E); 3647c781f9cd854f3d5d1c826f4a13382c6abca4cff7Douglas Gregor if (!DRE) 3648031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 3649031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 36501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const NonTypeTemplateParmDecl *NTTP 3651031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor = dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); 3652031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor if (!NTTP) 3653031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 3654031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3655ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (NTTP->getDepth() == Depth) 3656ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[NTTP->getIndex()] = true; 3657031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 3658031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3659e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 3660e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// nested name specifier. 3661e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregorstatic void 3662e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 3663e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor NestedNameSpecifier *NNS, 3664e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3665ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 3666e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor llvm::SmallVectorImpl<bool> &Used) { 3667e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!NNS) 3668e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 3669dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3670ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor MarkUsedTemplateParameters(SemaRef, NNS->getPrefix(), OnlyDeduced, Depth, 3671ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used); 3672dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, QualType(NNS->getAsType(), 0), 3673ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 3674e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor} 3675dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3676e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 3677e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// template name. 3678e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregorstatic void 3679e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 3680e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor TemplateName Name, 3681e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3682ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 3683e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor llvm::SmallVectorImpl<bool> &Used) { 3684e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (TemplateDecl *Template = Name.getAsTemplateDecl()) { 3685e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (TemplateTemplateParmDecl *TTP 3686ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor = dyn_cast<TemplateTemplateParmDecl>(Template)) { 3687ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (TTP->getDepth() == Depth) 3688ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[TTP->getIndex()] = true; 3689ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor } 3690e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 3691e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor } 3692dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3693788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (QualifiedTemplateName *QTN = Name.getAsQualifiedTemplateName()) 3694dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, QTN->getQualifier(), OnlyDeduced, 3695788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Depth, Used); 3696e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) 3697dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, DTN->getQualifier(), OnlyDeduced, 3698ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 3699e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor} 3700e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor 3701e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 3702031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// type. 37031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 3704e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, QualType T, 3705e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3706ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 3707e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor llvm::SmallVectorImpl<bool> &Used) { 3708e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (T.isNull()) 3709e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 3710dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3711031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor // Non-dependent types have nothing deducible 3712031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor if (!T->isDependentType()) 3713031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 3714031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3715031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor T = SemaRef.Context.getCanonicalType(T); 3716031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor switch (T->getTypeClass()) { 3717031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Pointer: 3718e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 3719e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<PointerType>(T)->getPointeeType(), 3720e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 3721ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 3722e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 3723031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3724031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3725031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::BlockPointer: 3726e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 3727e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<BlockPointerType>(T)->getPointeeType(), 3728e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 3729ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 3730e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 3731031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3732031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3733031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::LValueReference: 3734031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::RValueReference: 3735e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 3736e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ReferenceType>(T)->getPointeeType(), 3737e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 3738ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 3739e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 3740031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3741031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3742031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::MemberPointer: { 3743031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor const MemberPointerType *MemPtr = cast<MemberPointerType>(T.getTypePtr()); 3744e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, MemPtr->getPointeeType(), OnlyDeduced, 3745ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 3746e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, QualType(MemPtr->getClass(), 0), 3747ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 3748031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3749031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 3750031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3751031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::DependentSizedArray: 3752e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 3753e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<DependentSizedArrayType>(T)->getSizeExpr(), 3754ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 3755031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor // Fall through to check the element type 3756031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3757031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ConstantArray: 3758031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::IncompleteArray: 3759e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 3760e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ArrayType>(T)->getElementType(), 3761ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 3762031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3763031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3764031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Vector: 3765031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ExtVector: 3766e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 3767e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<VectorType>(T)->getElementType(), 3768ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 3769031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3770031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 37719cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor case Type::DependentSizedExtVector: { 37729cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor const DependentSizedExtVectorType *VecType 3773f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor = cast<DependentSizedExtVectorType>(T); 3774e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, VecType->getElementType(), OnlyDeduced, 3775ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 3776dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, VecType->getSizeExpr(), OnlyDeduced, 3777ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 37789cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor break; 37799cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor } 37809cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor 3781031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::FunctionProto: { 3782f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor const FunctionProtoType *Proto = cast<FunctionProtoType>(T); 3783e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, Proto->getResultType(), OnlyDeduced, 3784ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 3785031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor for (unsigned I = 0, N = Proto->getNumArgs(); I != N; ++I) 3786e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, Proto->getArgType(I), OnlyDeduced, 3787ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 3788031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3789031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 3790031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3791ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor case Type::TemplateTypeParm: { 3792ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor const TemplateTypeParmType *TTP = cast<TemplateTypeParmType>(T); 3793ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (TTP->getDepth() == Depth) 3794ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[TTP->getIndex()] = true; 3795031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3796ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor } 3797031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 37980bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor case Type::SubstTemplateTypeParmPack: { 37990bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor const SubstTemplateTypeParmPackType *Subst 38000bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor = cast<SubstTemplateTypeParmPackType>(T); 3801dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, 38020bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor QualType(Subst->getReplacedParameter(), 0), 38030bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor OnlyDeduced, Depth, Used); 38040bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor MarkUsedTemplateParameters(SemaRef, Subst->getArgumentPack(), 38050bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor OnlyDeduced, Depth, Used); 38060bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor break; 38070bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor } 38080bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor 380931f17ecbef57b5679c017c375db330546b7b5145John McCall case Type::InjectedClassName: 381031f17ecbef57b5679c017c375db330546b7b5145John McCall T = cast<InjectedClassNameType>(T)->getInjectedSpecializationType(); 381131f17ecbef57b5679c017c375db330546b7b5145John McCall // fall through 381231f17ecbef57b5679c017c375db330546b7b5145John McCall 3813031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::TemplateSpecialization: { 38141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const TemplateSpecializationType *Spec 3815f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor = cast<TemplateSpecializationType>(T); 3816e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, Spec->getTemplateName(), OnlyDeduced, 3817ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 3818dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38197b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 3820dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 3821dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 38227b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 3823dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 38247b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) 38257b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor break; 38267b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 3827e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) 3828ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor MarkUsedTemplateParameters(SemaRef, Spec->getArg(I), OnlyDeduced, Depth, 3829ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used); 3830e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor break; 3831e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor } 38321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3833e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor case Type::Complex: 3834e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!OnlyDeduced) 3835dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, 3836e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ComplexType>(T)->getElementType(), 3837ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 3838e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor break; 3839031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 38404714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor case Type::DependentName: 3841e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!OnlyDeduced) 3842e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 38434714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor cast<DependentNameType>(T)->getQualifier(), 3844ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 3845031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3846031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 384733500955d731c73717af52088b7fc0e7a85681e7John McCall case Type::DependentTemplateSpecialization: { 384833500955d731c73717af52088b7fc0e7a85681e7John McCall const DependentTemplateSpecializationType *Spec 384933500955d731c73717af52088b7fc0e7a85681e7John McCall = cast<DependentTemplateSpecializationType>(T); 385033500955d731c73717af52088b7fc0e7a85681e7John McCall if (!OnlyDeduced) 385133500955d731c73717af52088b7fc0e7a85681e7John McCall MarkUsedTemplateParameters(SemaRef, Spec->getQualifier(), 385233500955d731c73717af52088b7fc0e7a85681e7John McCall OnlyDeduced, Depth, Used); 3853dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38547b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 3855dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 3856dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 38577b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 3858dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 38597b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) 38607b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor break; 38617b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 386233500955d731c73717af52088b7fc0e7a85681e7John McCall for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) 386333500955d731c73717af52088b7fc0e7a85681e7John McCall MarkUsedTemplateParameters(SemaRef, Spec->getArg(I), OnlyDeduced, Depth, 386433500955d731c73717af52088b7fc0e7a85681e7John McCall Used); 386533500955d731c73717af52088b7fc0e7a85681e7John McCall break; 386633500955d731c73717af52088b7fc0e7a85681e7John McCall } 386733500955d731c73717af52088b7fc0e7a85681e7John McCall 3868ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::TypeOf: 3869ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 3870ad5e73887052193afda72db8efcb812bd083a4a8John McCall MarkUsedTemplateParameters(SemaRef, 3871ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<TypeOfType>(T)->getUnderlyingType(), 3872ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 3873ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 3874ad5e73887052193afda72db8efcb812bd083a4a8John McCall 3875ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::TypeOfExpr: 3876ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 3877ad5e73887052193afda72db8efcb812bd083a4a8John McCall MarkUsedTemplateParameters(SemaRef, 3878ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<TypeOfExprType>(T)->getUnderlyingExpr(), 3879ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 3880ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 3881ad5e73887052193afda72db8efcb812bd083a4a8John McCall 3882ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::Decltype: 3883ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 3884ad5e73887052193afda72db8efcb812bd083a4a8John McCall MarkUsedTemplateParameters(SemaRef, 3885ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<DecltypeType>(T)->getUnderlyingExpr(), 3886ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 3887ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 3888ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt 3889ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt case Type::UnaryTransform: 3890ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt if (!OnlyDeduced) 3891ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt MarkUsedTemplateParameters(SemaRef, 3892ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt cast<UnaryTransformType>(T)->getUnderlyingType(), 3893ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt OnlyDeduced, Depth, Used); 3894ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt break; 3895ad5e73887052193afda72db8efcb812bd083a4a8John McCall 38967536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor case Type::PackExpansion: 3897dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, 38987536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor cast<PackExpansionType>(T)->getPattern(), 38997536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor OnlyDeduced, Depth, Used); 39007536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor break; 39017536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor 390234b41d939a1328f484511c6002ba2456db879a29Richard Smith case Type::Auto: 390334b41d939a1328f484511c6002ba2456db879a29Richard Smith MarkUsedTemplateParameters(SemaRef, 390434b41d939a1328f484511c6002ba2456db879a29Richard Smith cast<AutoType>(T)->getDeducedType(), 390534b41d939a1328f484511c6002ba2456db879a29Richard Smith OnlyDeduced, Depth, Used); 390634b41d939a1328f484511c6002ba2456db879a29Richard Smith 3907e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // None of these types have any template parameters in them. 3908031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Builtin: 3909031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::VariableArray: 3910031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::FunctionNoProto: 3911031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Record: 3912031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Enum: 3913031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ObjCInterface: 3914c12c5bba6ceb6acd4e51e7a0fc03257da9cfd44eJohn McCall case Type::ObjCObject: 3915d1b3c2dd5bc1f3103bee6137957aa7c5f8f2f0bcSteve Naroff case Type::ObjCObjectPointer: 3916ed97649e9574b9d854fa4d6109c9333ae0993554John McCall case Type::UnresolvedUsing: 3917031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define TYPE(Class, Base) 3918031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define ABSTRACT_TYPE(Class, Base) 3919031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define DEPENDENT_TYPE(Class, Base) 3920031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 3921031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#include "clang/AST/TypeNodes.def" 3922031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3923031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 3924031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 3925031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3926e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by this 3927031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// template argument. 39281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 3929e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 3930e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const TemplateArgument &TemplateArg, 3931e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3932ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 3933e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor llvm::SmallVectorImpl<bool> &Used) { 3934031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor switch (TemplateArg.getKind()) { 3935031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Null: 3936031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Integral: 3937788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Declaration: 3938031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 39391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3940031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Type: 3941e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, TemplateArg.getAsType(), OnlyDeduced, 3942ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 3943031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3944031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3945788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 3946a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 3947dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, 3948dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArg.getAsTemplateOrTemplatePattern(), 3949788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor OnlyDeduced, Depth, Used); 3950031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3951031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3952031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Expression: 3953dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, TemplateArg.getAsExpr(), OnlyDeduced, 3954ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 3955031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 3956dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3957d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson case TemplateArgument::Pack: 3958e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor for (TemplateArgument::pack_iterator P = TemplateArg.pack_begin(), 3959e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor PEnd = TemplateArg.pack_end(); 3960e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor P != PEnd; ++P) 3961ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor MarkUsedTemplateParameters(SemaRef, *P, OnlyDeduced, Depth, Used); 3962d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson break; 3963031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 3964031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 3965031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3966031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \brief Mark the template parameters can be deduced by the given 3967031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// template argument list. 3968031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// 3969031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \param TemplateArgs the template argument list from which template 3970031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// parameters will be deduced. 3971031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// 3972031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \param Deduced a bit vector whose elements will be set to \c true 3973031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// to indicate when the corresponding template parameter will be 3974031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// deduced. 39751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid 3976e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorSema::MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs, 3977ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor bool OnlyDeduced, unsigned Depth, 3978e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor llvm::SmallVectorImpl<bool> &Used) { 39797b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 3980dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 3981dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 39827b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 3983dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 39847b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(TemplateArgs.data(), TemplateArgs.size())) 39857b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return; 39867b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 3987031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) 3988dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(*this, TemplateArgs[I], OnlyDeduced, 3989ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 3990031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 399163f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor 399263f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor/// \brief Marks all of the template parameters that will be deduced by a 399363f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor/// call to the given function template. 3994dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumivoid 399502024a9f0d8e6c898de276193af604c42ee41269Douglas GregorSema::MarkDeducedTemplateParameters(FunctionTemplateDecl *FunctionTemplate, 399602024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor llvm::SmallVectorImpl<bool> &Deduced) { 3997dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateParameterList *TemplateParams 399863f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor = FunctionTemplate->getTemplateParameters(); 399963f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor Deduced.clear(); 400063f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor Deduced.resize(TemplateParams->size()); 4001dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 400263f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 400363f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) 400463f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor ::MarkUsedTemplateParameters(*this, Function->getParamDecl(I)->getType(), 4005ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor true, TemplateParams->getDepth(), Deduced); 400663f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor} 4007