SemaTemplateDeduction.cpp revision 5fad9b8362c62e230f6603d86ec7d1747e74c737
10b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor//===------- SemaTemplateDeduction.cpp - Template Argument Deduction ------===/ 20b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// 30b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// The LLVM Compiler Infrastructure 40b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// 50b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// This file is distributed under the University of Illinois Open Source 60b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// License. See LICENSE.TXT for details. 70b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor//===----------------------------------------------------------------------===/ 80b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// 90b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// This file implements C++ template argument deduction. 100b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor// 110b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor//===----------------------------------------------------------------------===/ 120b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 13e737f5041a36d0befb39ffeed8d50ba15916d3daDouglas Gregor#include "clang/Sema/Sema.h" 1419510856727e0e14a3696b2a72c35163bff2a71fJohn McCall#include "clang/Sema/DeclSpec.h" 157cd088e519d7e6caa4c4c12db52e0e4ae35d25c2John McCall#include "clang/Sema/Template.h" 162a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall#include "clang/Sema/TemplateDeduction.h" 170b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/ASTContext.h" 187cd088e519d7e6caa4c4c12db52e0e4ae35d25c2John McCall#include "clang/AST/DeclObjC.h" 190b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/DeclTemplate.h" 200b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/StmtVisitor.h" 210b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/Expr.h" 220b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor#include "clang/AST/ExprCXX.h" 23e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor#include "llvm/ADT/BitVector.h" 2434b41d939a1328f484511c6002ba2456db879a29Richard Smith#include "TreeTransform.h" 258a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor#include <algorithm> 26508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor 27508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregornamespace clang { 282a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall using namespace sema; 292a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall 30508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Various flags that control template argument deduction. 31508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// 32508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// These flags can be bitwise-OR'd together. 33508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor enum TemplateDeductionFlags { 34508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief No template argument deduction flags, which indicates the 35508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// strictest results for template argument deduction (as used for, e.g., 36508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// matching class template partial specializations). 37508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF_None = 0, 38508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Within template argument deduction from a function call, we are 39508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// matching with a parameter type for which the original parameter was 40508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// a reference. 41508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF_ParamWithReferenceType = 0x1, 42508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Within template argument deduction from a function call, we 43508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// are matching in a case where we ignore cv-qualifiers. 44508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF_IgnoreQualifiers = 0x02, 45508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// \brief Within template argument deduction from a function call, 46508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor /// we are matching in a case where we can perform template argument 474112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor /// deduction from a template-id of a derived class of the argument type. 481282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor TDF_DerivedClass = 0x04, 491282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor /// \brief Allow non-dependent types to differ, e.g., when performing 501282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor /// template argument deduction from a function call where conversions 511282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor /// may apply. 5273b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF_SkipNonDependent = 0x08, 5373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor /// \brief Whether we are performing template argument deduction for 54dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi /// parameters and arguments in a top-level template argument 5573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF_TopLevelParameterTypeList = 0x10 56508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor }; 57508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor} 58508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor 590b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregorusing namespace clang; 600b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 619d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor/// \brief Compare two APSInts, extending and switching the sign as 629d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor/// necessary to compare their values regardless of underlying type. 639d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregorstatic bool hasSameExtendedValue(llvm::APSInt X, llvm::APSInt Y) { 649d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if (Y.getBitWidth() > X.getBitWidth()) 659f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad X = X.extend(Y.getBitWidth()); 669d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor else if (Y.getBitWidth() < X.getBitWidth()) 679f71a8f4c7a182a5236da9e747d57cc1d1bd24c2Jay Foad Y = Y.extend(X.getBitWidth()); 689d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 699d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor // If there is a signedness mismatch, correct it. 709d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if (X.isSigned() != Y.isSigned()) { 719d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor // If the signed value is negative, then the values cannot be the same. 729d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if ((Y.isSigned() && Y.isNegative()) || (X.isSigned() && X.isNegative())) 739d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor return false; 749d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 759d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor Y.setIsSigned(true); 769d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor X.setIsSigned(true); 779d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor } 789d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 799d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor return X == Y; 809d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor} 819d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor 82f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 83a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 84f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 85f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor const TemplateArgument &Param, 8677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor TemplateArgument Arg, 872a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 885f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced); 89d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 90b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \brief Whether template argument deduction for two reference parameters 91b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// resulted in the argument type, parameter type, or neither type being more 92b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// qualified than the other. 93dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumienum DeductionQualifierComparison { 94dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NeitherMoreQualified = 0, 95dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ParamMoreQualified, 96dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ArgMoreQualified 975c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor}; 985c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor 99b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \brief Stores the result of comparing two reference parameters while 100b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// performing template argument deduction for partial ordering of function 101dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// templates. 102b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregorstruct RefParamPartialOrderingComparison { 103b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /// \brief Whether the parameter type is an rvalue reference type. 104b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor bool ParamIsRvalueRef; 105b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /// \brief Whether the argument type is an rvalue reference type. 106b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor bool ArgIsRvalueRef; 107dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 108b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /// \brief Whether the parameter or argument (or neither) is more qualified. 109b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor DeductionQualifierComparison Qualifiers; 110b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor}; 111b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 112b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 1135c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor 11420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregorstatic Sema::TemplateDeductionResult 11520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas GregorDeduceTemplateArguments(Sema &S, 11620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateParameterList *TemplateParams, 117603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor QualType Param, 118603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor QualType Arg, 119603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateDeductionInfo &Info, 1205f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 1215c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned TDF, 1225c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool PartialOrdering = false, 1235f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<RefParamPartialOrderingComparison> * 124b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons = 0); 125603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 126603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregorstatic Sema::TemplateDeductionResult 127603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas GregorDeduceTemplateArguments(Sema &S, 128603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateParameterList *TemplateParams, 12920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Params, unsigned NumParams, 13020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Args, unsigned NumArgs, 13120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateDeductionInfo &Info, 1325f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 1330972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor bool NumberOfArgumentsMustMatch = true); 13420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 135199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// \brief If the given expression is of a form that permits the deduction 136199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// of a non-type template parameter, return the declaration of that 137199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// non-type template parameter. 138199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregorstatic NonTypeTemplateParmDecl *getDeducedParameterFromExpr(Expr *E) { 139199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (ImplicitCastExpr *IC = dyn_cast<ImplicitCastExpr>(E)) 140199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor E = IC->getSubExpr(); 1411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 142199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) 143199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor return dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); 1441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 145199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor return 0; 146199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor} 147199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1480d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// \brief Determine whether two declaration pointers refer to the same 1490d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// declaration. 1500d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregorstatic bool isSameDeclaration(Decl *X, Decl *Y) { 1510d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (!X || !Y) 1520d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return !X && !Y; 153dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1540d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (NamedDecl *NX = dyn_cast<NamedDecl>(X)) 1550d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X = NX->getUnderlyingDecl(); 1560d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (NamedDecl *NY = dyn_cast<NamedDecl>(Y)) 1570d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y = NY->getUnderlyingDecl(); 158dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1590d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X->getCanonicalDecl() == Y->getCanonicalDecl(); 1600d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor} 1610d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 1620d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// \brief Verify that the given, deduced template arguments are compatible. 1630d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// 1640d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// \returns The deduced template argument, or a NULL template argument if 1650d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor/// the deduced template arguments were incompatible. 166dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic DeducedTemplateArgument 1670d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas GregorcheckDeducedTemplateArguments(ASTContext &Context, 1680d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor const DeducedTemplateArgument &X, 1690d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor const DeducedTemplateArgument &Y) { 1700d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // We have no deduction for one or both of the arguments; they're compatible. 1710d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (X.isNull()) 1720d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return Y; 1730d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.isNull()) 174dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return X; 1750d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 1760d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor switch (X.getKind()) { 1770d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Null: 1780d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor llvm_unreachable("Non-deduced template arguments handled above"); 1790d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 1800d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Type: 1810d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If two template type arguments have the same type, they're compatible. 1820d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Type && 1830d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Context.hasSameType(X.getAsType(), Y.getAsType())) 1840d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 185dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1860d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 187dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1880d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Integral: 1890d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced a constant in one case and either a dependent expression or 1900d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // declaration in another case, keep the integral constant. 1910d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If both are integral constants with the same value, keep that value. 1920d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Expression || 1930d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.getKind() == TemplateArgument::Declaration || 1940d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor (Y.getKind() == TemplateArgument::Integral && 1950d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor hasSameExtendedValue(*X.getAsIntegral(), *Y.getAsIntegral()))) 196dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeducedTemplateArgument(X, 1970d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X.wasDeducedFromArrayBound() && 1980d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.wasDeducedFromArrayBound()); 1990d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 2000d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 2010d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 202dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2030d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Template: 2040d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Template && 2050d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Context.hasSameTemplateName(X.getAsTemplate(), Y.getAsTemplate())) 2060d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 207dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2080d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 209dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeducedTemplateArgument(); 210a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 211a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 212a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor if (Y.getKind() == TemplateArgument::TemplateExpansion && 213dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Context.hasSameTemplateName(X.getAsTemplateOrTemplatePattern(), 214a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Y.getAsTemplateOrTemplatePattern())) 215a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor return X; 216dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 217a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor // All other combinations are incompatible. 218dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeducedTemplateArgument(); 219a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 2200d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Expression: 221dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we deduced a dependent expression in one case and either an integral 222dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // constant or a declaration in another case, keep the integral constant 2230d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // or declaration. 2240d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Integral || 2250d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.getKind() == TemplateArgument::Declaration) 2260d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(Y, X.wasDeducedFromArrayBound() && 2270d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.wasDeducedFromArrayBound()); 228dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2290d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Expression) { 2300d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // Compare the expressions for equality 2310d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor llvm::FoldingSetNodeID ID1, ID2; 2320d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X.getAsExpr()->Profile(ID1, Context, true); 2330d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Y.getAsExpr()->Profile(ID2, Context, true); 2340d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (ID1 == ID2) 2350d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 2360d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor } 237dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2380d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 2390d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 240dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2410d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Declaration: 2420d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced a declaration and a dependent expression, keep the 2430d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // declaration. 2440d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Expression) 2450d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 246dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2470d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced a declaration and an integral constant, keep the 2480d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // integral constant. 2490d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Integral) 2500d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return Y; 251dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2520d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // If we deduced two declarations, make sure they they refer to the 2530d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // same declaration. 2540d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() == TemplateArgument::Declaration && 2550d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor isSameDeclaration(X.getAsDecl(), Y.getAsDecl())) 2560d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 257dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2580d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor // All other combinations are incompatible. 2590d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 260dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2610d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor case TemplateArgument::Pack: 2620d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Y.getKind() != TemplateArgument::Pack || 2630d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor X.pack_size() != Y.pack_size()) 2640d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 265dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 266dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (TemplateArgument::pack_iterator XA = X.pack_begin(), 2670d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor XAEnd = X.pack_end(), 2680d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor YA = Y.pack_begin(); 2690d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor XA != XAEnd; ++XA, ++YA) { 270dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (checkDeducedTemplateArguments(Context, 271dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument(*XA, X.wasDeducedFromArrayBound()), 272135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor DeducedTemplateArgument(*YA, Y.wasDeducedFromArrayBound())) 273135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor .isNull()) 2740d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 2750d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor } 276dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2770d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return X; 2780d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor } 279dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2800d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor return DeducedTemplateArgument(); 2810d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor} 2820d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor 2831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Deduce the value of the given non-type template parameter 284199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// from the given constant. 285f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 286a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceNonTypeTemplateArgument(Sema &S, 2871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NonTypeTemplateParmDecl *NTTP, 2889d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor llvm::APSInt Value, QualType ValueType, 28902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor bool DeducedFromArrayBound, 2902a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 2915f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 2921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 293199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument with depth > 0"); 2941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2950d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(Value, ValueType, DeducedFromArrayBound); 296dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 2970d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()], 2980d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 2990d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 300f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.Param = NTTP; 301f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Deduced[NTTP->getIndex()]; 3020d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 303dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 304f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 305dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3060d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()] = Result; 307f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 308199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor} 309199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 3101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Deduce the value of the given non-type template parameter 311199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// from the given type- or value-dependent expression. 312199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// 313199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor/// \returns true if deduction succeeded, false otherwise. 314f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 315a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceNonTypeTemplateArgument(Sema &S, 316f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor NonTypeTemplateParmDecl *NTTP, 317f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Expr *Value, 3182a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3195f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 3201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 321199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument with depth > 0"); 322199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor assert((Value->isTypeDependent() || Value->isValueDependent()) && 323199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Expression template argument must be type- or value-dependent."); 3241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3250d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(Value); 326dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 327dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Deduced[NTTP->getIndex()], 3280d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 329dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3300d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 3310d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = NTTP; 3320d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[NTTP->getIndex()]; 3330d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 334dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 3359eea08ba72f8b1e7faf38e43376b9157fc4a2af2Douglas Gregor } 336dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3370d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()] = Result; 338f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 339199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor} 340199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 34115755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// \brief Deduce the value of the given non-type template parameter 34215755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// from the given declaration. 34315755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// 34415755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor/// \returns true if deduction succeeded, false otherwise. 34515755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregorstatic Sema::TemplateDeductionResult 346a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceNonTypeTemplateArgument(Sema &S, 34715755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor NonTypeTemplateParmDecl *NTTP, 34815755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor Decl *D, 3492a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3505f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 35115755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor assert(NTTP->getDepth() == 0 && 35215755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor "Cannot deduce non-type template argument with depth > 0"); 353dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3540d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(D? D->getCanonicalDecl() : 0); 355dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 3560d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()], 3570d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 3580d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 3590d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = NTTP; 3600d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[NTTP->getIndex()]; 3610d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 362dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 36315755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor } 364dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3650d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[NTTP->getIndex()] = Result; 36615755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor return Sema::TDK_Success; 36715755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor} 36815755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor 369f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 370a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 371db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor TemplateParameterList *TemplateParams, 372f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateName Param, 373f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateName Arg, 3742a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 3755f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 376d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor TemplateDecl *ParamDecl = Param.getAsTemplateDecl(); 377db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (!ParamDecl) { 378db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // The parameter type is dependent and is not a template template parameter, 379db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // so there is nothing that we can deduce. 380db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor return Sema::TDK_Success; 381f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 382dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 383db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (TemplateTemplateParmDecl *TempParam 384db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor = dyn_cast<TemplateTemplateParmDecl>(ParamDecl)) { 3850d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(S.Context.getCanonicalTemplateName(Arg)); 386dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 3870d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[TempParam->getIndex()], 3880d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 3890d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 3900d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = TempParam; 3910d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[TempParam->getIndex()]; 3920d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 393dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 394db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor } 395dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3960d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[TempParam->getIndex()] = Result; 397dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Success; 398f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 399dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 400db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // Verify that the two template names are equivalent. 401a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth if (S.Context.hasSameTemplateName(Param, Arg)) 402db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor return Sema::TDK_Success; 403dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 404db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // Mismatch of non-dependent template parameter to argument. 405db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Info.FirstArg = TemplateArgument(Param); 406db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Info.SecondArg = TemplateArgument(Arg); 407db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor return Sema::TDK_NonDeducedMismatch; 408d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor} 409d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 4101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Deduce the template arguments by comparing the template parameter 411de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// type (which is a template-id) with the template argument type. 412de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 413a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth/// \param S the Sema 414de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 415de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param TemplateParams the template parameters that we are deducing 416de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 417de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Param the parameter type 418de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 419de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Arg the argument type 420de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 421de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Info information about the template argument deduction itself 422de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 423de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \param Deduced the deduced template arguments 424de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// 425de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// \returns the result of template argument deduction so far. Note that a 426de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// "success" result means that template argument deduction has not yet failed, 427de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor/// but it may still fail, later, for other reasons. 428de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregorstatic Sema::TemplateDeductionResult 429a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 430de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor TemplateParameterList *TemplateParams, 431de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const TemplateSpecializationType *Param, 432de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor QualType Arg, 4332a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 4345f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 435467b27b9a24bdc823218ad1ad0e37673b6cc1e83John McCall assert(Arg.isCanonical() && "Argument type must be canonical"); 4361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 437de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Check whether the template argument is a dependent template-id. 4381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateSpecializationType *SpecArg 439de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor = dyn_cast<TemplateSpecializationType>(Arg)) { 440de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Perform template argument deduction for the template name. 441de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Sema::TemplateDeductionResult Result 442a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 443de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Param->getTemplateName(), 444de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor SpecArg->getTemplateName(), 445de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced)) 446de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 4471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 449de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Perform template argument deduction on each template 4500972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor // argument. Ignore any missing/extra arguments, since they could be 4510972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor // filled in by default arguments. 452dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 453dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Param->getArgs(), Param->getNumArgs(), 4540972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor SpecArg->getArgs(), SpecArg->getNumArgs(), 4550972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor Info, Deduced, 4560972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor /*NumberOfArgumentsMustMatch=*/false); 457de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 4581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 459de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If the argument type is a class template specialization, we 460de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // perform template argument deduction using its template 461de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // arguments. 462de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const RecordType *RecordArg = dyn_cast<RecordType>(Arg); 463de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!RecordArg) 464de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_NonDeducedMismatch; 4651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump ClassTemplateSpecializationDecl *SpecArg 467de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor = dyn_cast<ClassTemplateSpecializationDecl>(RecordArg->getDecl()); 468de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!SpecArg) 469de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_NonDeducedMismatch; 4701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 471de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Perform template argument deduction for the template name. 472de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Sema::TemplateDeductionResult Result 473a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, 474db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor TemplateParams, 475de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Param->getTemplateName(), 476de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor TemplateName(SpecArg->getSpecializedTemplate()), 477de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced)) 478de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 4791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 48020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Perform template argument deduction for the template arguments. 481dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 48220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Param->getArgs(), Param->getNumArgs(), 48320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor SpecArg->getTemplateArgs().data(), 48420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor SpecArg->getTemplateArgs().size(), 48520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Info, Deduced); 486de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor} 487de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor 488cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall/// \brief Determines whether the given type is an opaque type that 489cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall/// might be more qualified when instantiated. 490cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCallstatic bool IsPossiblyOpaquelyQualifiedType(QualType T) { 491cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall switch (T->getTypeClass()) { 492cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::TypeOfExpr: 493cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::TypeOf: 494cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::DependentName: 495cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::Decltype: 496cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::UnresolvedUsing: 49762c28c831bbf207cc36e683e7c321fc33bf8928cJohn McCall case Type::TemplateTypeParm: 498cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall return true; 499cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall 500cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::ConstantArray: 501cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::IncompleteArray: 502cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::VariableArray: 503cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall case Type::DependentSizedArray: 504cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall return IsPossiblyOpaquelyQualifiedType( 505cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall cast<ArrayType>(T)->getElementType()); 506cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall 507cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall default: 508cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall return false; 509cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall } 510cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall} 511cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall 512d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor/// \brief Retrieve the depth and index of a template parameter. 513dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic std::pair<unsigned, unsigned> 514d3731198193eee92796ddeb493973b7a598b003eDouglas GregorgetDepthAndIndex(NamedDecl *ND) { 515603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(ND)) 516603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return std::make_pair(TTP->getDepth(), TTP->getIndex()); 517dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 518603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(ND)) 519603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return std::make_pair(NTTP->getDepth(), NTTP->getIndex()); 520dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 521603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(ND); 522603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return std::make_pair(TTP->getDepth(), TTP->getIndex()); 523603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor} 524603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 525d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor/// \brief Retrieve the depth and index of an unexpanded parameter pack. 526dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic std::pair<unsigned, unsigned> 527d3731198193eee92796ddeb493973b7a598b003eDouglas GregorgetDepthAndIndex(UnexpandedParameterPack UPP) { 528d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (const TemplateTypeParmType *TTP 529d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor = UPP.first.dyn_cast<const TemplateTypeParmType *>()) 530d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor return std::make_pair(TTP->getDepth(), TTP->getIndex()); 531dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 532d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor return getDepthAndIndex(UPP.first.get<NamedDecl *>()); 533d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor} 534d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor 535603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \brief Helper function to build a TemplateParameter when we don't 536603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// know its type statically. 537603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregorstatic TemplateParameter makeTemplateParameter(Decl *D) { 538603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(D)) 539603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return TemplateParameter(TTP); 540603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor else if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) 541603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return TemplateParameter(NTTP); 542dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 543603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return TemplateParameter(cast<TemplateTemplateParmDecl>(D)); 544603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor} 545603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 5465429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor/// \brief Prepare to perform template argument deduction for all of the 5475429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor/// arguments in a set of argument packs. 548dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic void PrepareArgumentPackDeduction(Sema &S, 5495f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 5505f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner const SmallVectorImpl<unsigned> &PackIndices, 5515f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, 5525f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl< 5535f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> > &NewlyDeducedPacks) { 5545429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // Save the deduced template arguments for each parameter pack expanded 5555429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // by this pack expansion, then clear out the deduction. 5565429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 5575429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // Save the previously-deduced argument pack, then clear it out so that we 5585429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // can deduce a new argument pack. 5595429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor SavedPacks[I] = Deduced[PackIndices[I]]; 560dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Deduced[PackIndices[I]] = TemplateArgument(); 561dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 5625429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // If the template arugment pack was explicitly specified, add that to 5635429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor // the set of deduced arguments. 5645429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor const TemplateArgument *ExplicitArgs; 5655429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor unsigned NumExplicitArgs; 566dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NamedDecl *PartiallySubstitutedPack 5675429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor = S.CurrentInstantiationScope->getPartiallySubstitutedPack( 5685429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor &ExplicitArgs, 5695429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor &NumExplicitArgs)) { 5705429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor if (getDepthAndIndex(PartiallySubstitutedPack).second == PackIndices[I]) 571dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks[I].append(ExplicitArgs, 5725429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor ExplicitArgs + NumExplicitArgs); 5735429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor } 5745429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor } 5755429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor} 5765429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor 5770216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor/// \brief Finish template argument deduction for a set of argument packs, 5780216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor/// producing the argument packs and checking for consistency with prior 5790216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor/// deductions. 5800216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregorstatic Sema::TemplateDeductionResult 5810216f8121df32b320cab659d5b703fee50cdfda5Douglas GregorFinishArgumentPackDeduction(Sema &S, 5820216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor TemplateParameterList *TemplateParams, 5830216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor bool HasAnyArguments, 5845f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 5855f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner const SmallVectorImpl<unsigned> &PackIndices, 5865f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, 5875f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl< 5885f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> > &NewlyDeducedPacks, 5890216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor TemplateDeductionInfo &Info) { 5900216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 5910216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // pack expansion. 5920216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 5930216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (HasAnyArguments && NewlyDeducedPacks[I].empty()) { 5940216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // We were not able to deduce anything for this parameter pack, 5950216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // so just restore the saved argument pack. 5960216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced[PackIndices[I]] = SavedPacks[I]; 5970216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor continue; 5980216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 599dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6000216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor DeducedTemplateArgument NewPack; 601dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6020216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (NewlyDeducedPacks[I].empty()) { 6030216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor // If we deduced an empty argument pack, create it now. 6040216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewPack = DeducedTemplateArgument(TemplateArgument(0, 0)); 6050216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } else { 6060216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor TemplateArgument *ArgumentPack 607203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor = new (S.Context) TemplateArgument [NewlyDeducedPacks[I].size()]; 6080216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor std::copy(NewlyDeducedPacks[I].begin(), NewlyDeducedPacks[I].end(), 6090216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor ArgumentPack); 6100216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewPack 611203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor = DeducedTemplateArgument(TemplateArgument(ArgumentPack, 612203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor NewlyDeducedPacks[I].size()), 613dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks[I][0].wasDeducedFromArrayBound()); 6140216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 615dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6160216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor DeducedTemplateArgument Result 6170216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor = checkDeducedTemplateArguments(S.Context, SavedPacks[I], NewPack); 6180216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Result.isNull()) { 6190216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Info.Param 6200216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor = makeTemplateParameter(TemplateParams->getParam(PackIndices[I])); 6210216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Info.FirstArg = SavedPacks[I]; 6220216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Info.SecondArg = NewPack; 6230216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor return Sema::TDK_Inconsistent; 6240216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 625dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6260216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced[PackIndices[I]] = Result; 6270216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor } 628dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 6290216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor return Sema::TDK_Success; 6300216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor} 6310216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor 632603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \brief Deduce the template arguments by comparing the list of parameter 633dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// types to the list of argument types, as in the parameter-type-lists of 634dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// function types (C++ [temp.deduct.type]p10). 635603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 636603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param S The semantic analysis object within which we are deducing 637603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 638603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param TemplateParams The template parameters that we are deducing 639603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 640603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Params The list of parameter types 641603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 642603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param NumParams The number of types in \c Params 643603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 644603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Args The list of argument types 645603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 646603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param NumArgs The number of types in \c Args 647603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 648603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Info information about the template argument deduction itself 649603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 650603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param Deduced the deduced template arguments 651603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 652603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe 653603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// how template argument deduction is performed. 654603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// 6555c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param PartialOrdering If true, we are performing template argument 656dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// deduction for during partial ordering for a call 6575c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// (C++0x [temp.deduct.partial]). 6585c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 659b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \param RefParamComparisons If we're performing template argument deduction 6605c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering, the set of qualifier comparisons. 6615c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 662603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// \returns the result of template argument deduction so far. Note that a 663603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// "success" result means that template argument deduction has not yet failed, 664603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor/// but it may still fail, later, for other reasons. 665603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregorstatic Sema::TemplateDeductionResult 666603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas GregorDeduceTemplateArguments(Sema &S, 667603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateParameterList *TemplateParams, 668603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor const QualType *Params, unsigned NumParams, 669603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor const QualType *Args, unsigned NumArgs, 670603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor TemplateDeductionInfo &Info, 6715f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 6725c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned TDF, 6735c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool PartialOrdering = false, 6745f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<RefParamPartialOrderingComparison> * 675b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons = 0) { 6760bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor // Fast-path check to see if we have too many/too few arguments. 6770bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor if (NumParams != NumArgs && 6780bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor !(NumParams && isa<PackExpansionType>(Params[NumParams - 1])) && 6790bbacf8d2b3c7a5f19f292f3201e371836445502Douglas Gregor !(NumArgs && isa<PackExpansionType>(Args[NumArgs - 1]))) 6803cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 681dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 682603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // C++0x [temp.deduct.type]p10: 683dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Similarly, if P has a form that contains (T), then each parameter type 684dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Pi of the respective parameter-type- list of P is compared with the 685dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // corresponding parameter type Ai of the corresponding parameter-type-list 686dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // of A. [...] 687603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor unsigned ArgIdx = 0, ParamIdx = 0; 688603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (; ParamIdx != NumParams; ++ParamIdx) { 689603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Check argument types. 690dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const PackExpansionType *Expansion 691603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor = dyn_cast<PackExpansionType>(Params[ParamIdx]); 692603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (!Expansion) { 693603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Simple case: compare the parameter and argument types at this point. 694dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 695603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Make sure we have an argument. 696603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (ArgIdx >= NumArgs) 6973cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 698dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 69977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (isa<PackExpansionType>(Args[ArgIdx])) { 70077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // C++0x [temp.deduct.type]p22: 70177d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the original function parameter associated with A is a function 70277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // parameter pack and the function parameter associated with P is not 70377d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // a function parameter pack, then template argument deduction fails. 70477d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor return Sema::TDK_NonDeducedMismatch; 70577d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor } 706dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 707603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (Sema::TemplateDeductionResult Result 7085c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, 7095c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Params[ParamIdx], 7105c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args[ArgIdx], 7115c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Info, Deduced, TDF, 7125c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PartialOrdering, 713b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons)) 714603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Result; 715dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 716603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor ++ArgIdx; 717603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor continue; 718603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 719dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 7207d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // C++0x [temp.deduct.type]p5: 7217d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // The non-deduced contexts are: 722dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - A function parameter pack that does not occur at the end of the 7237d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // parameter-declaration-clause. 7247d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor if (ParamIdx + 1 < NumParams) 7257d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor return Sema::TDK_Success; 7267d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor 727603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // C++0x [temp.deduct.type]p10: 728dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the parameter-declaration corresponding to Pi is a function 729603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // parameter pack, then the type of its declarator- id is compared with 730dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // each remaining parameter type in the parameter-type-list of A. Each 731603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // comparison deduces template arguments for subsequent positions in the 732603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // template parameter packs expanded by the function parameter pack. 733dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 734603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Compute the set of template parameter indices that correspond to 735603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // parameter packs expanded by the pack expansion. 7365f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<unsigned, 2> PackIndices; 737603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor QualType Pattern = Expansion->getPattern(); 738603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor { 739603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::BitVector SawIndices(TemplateParams->size()); 7405f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UnexpandedParameterPack, 2> Unexpanded; 741603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor S.collectUnexpandedParameterPacks(Pattern, Unexpanded); 742603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 743603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor unsigned Depth, Index; 744603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 745603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 746603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor SawIndices[Index] = true; 747603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor PackIndices.push_back(Index); 748603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 749603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 750603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 751603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 752603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 753d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Keep track of the deduced template arguments for each parameter pack 754dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 755d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template argument (the inner SmallVectors). 7565f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> 757d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 7585f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 2> 7595429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor SavedPacks(PackIndices.size()); 760dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, 7615429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks); 762dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 763603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor bool HasAnyArguments = false; 764603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (; ArgIdx < NumArgs; ++ArgIdx) { 765603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor HasAnyArguments = true; 766dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 767603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Deduce template arguments from the pattern. 768dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (Sema::TemplateDeductionResult Result 76973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, Pattern, Args[ArgIdx], 77073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Info, Deduced, TDF, PartialOrdering, 77173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor RefParamComparisons)) 772603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Result; 773dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 774603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 775603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 776603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // for that pack, then clear out the deduced argument. 777603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 778603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 779603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (!DeducedArg.isNull()) { 780603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 781603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor DeducedArg = DeducedTemplateArgument(); 782603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 783603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 784603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 785dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 786603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 787603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // pack expansion. 7880216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 789dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(S, TemplateParams, HasAnyArguments, 7900216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 7910216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 792dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 793603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor } 794dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 795603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor // Make sure we don't have any extra arguments. 796603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor if (ArgIdx < NumArgs) 7973cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 798dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 799603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return Sema::TDK_Success; 800603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor} 801603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor 80261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor/// \brief Determine whether the parameter has qualifiers that are either 80361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor/// inconsistent with or a superset of the argument's qualifiers. 80461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregorstatic bool hasInconsistentOrSupersetQualifiersOf(QualType ParamType, 80561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor QualType ArgType) { 80661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ParamQs = ParamType.getQualifiers(); 80761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ArgQs = ArgType.getQualifiers(); 80861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 80961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs == ArgQs) 81061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return false; 81161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 81261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Mismatched (but not missing) Objective-C GC attributes. 81361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.getObjCGCAttr() != ArgQs.getObjCGCAttr() && 81461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ParamQs.hasObjCGCAttr()) 81561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return true; 81661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 81761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Mismatched (but not missing) address spaces. 81861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.getAddressSpace() != ArgQs.getAddressSpace() && 81961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ParamQs.hasAddressSpace()) 82061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return true; 82161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 822f85e193739c953358c865005855253af4f68a497John McCall // Mismatched (but not missing) Objective-C lifetime qualifiers. 823f85e193739c953358c865005855253af4f68a497John McCall if (ParamQs.getObjCLifetime() != ArgQs.getObjCLifetime() && 824f85e193739c953358c865005855253af4f68a497John McCall ParamQs.hasObjCLifetime()) 825f85e193739c953358c865005855253af4f68a497John McCall return true; 826f85e193739c953358c865005855253af4f68a497John McCall 82761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // CVR qualifier superset. 82861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor return (ParamQs.getCVRQualifiers() != ArgQs.getCVRQualifiers()) && 82961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor ((ParamQs.getCVRQualifiers() | ArgQs.getCVRQualifiers()) 83061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor == ParamQs.getCVRQualifiers()); 83161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor} 83261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 833500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \brief Deduce the template arguments by comparing the parameter type and 834500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// the argument type (C++ [temp.deduct.type]). 835500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 836a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth/// \param S the semantic analysis object within which we are deducing 837500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 838500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param TemplateParams the template parameters that we are deducing 839500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 840500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param ParamIn the parameter type 841500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 842500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param ArgIn the argument type 843500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 844500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param Info information about the template argument deduction itself 845500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 846500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \param Deduced the deduced template arguments 847500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 848508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor/// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe 8491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// how template argument deduction is performed. 850500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// 8515c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param PartialOrdering Whether we're performing template argument deduction 8525c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering (C++0x [temp.deduct.partial]). 8535c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 854b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor/// \param RefParamComparisons If we're performing template argument deduction 8555c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// in the context of partial ordering, the set of qualifier comparisons. 8565c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 857500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// \returns the result of template argument deduction so far. Note that a 858500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// "success" result means that template argument deduction has not yet failed, 859500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor/// but it may still fail, later, for other reasons. 860f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 861a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 862f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 863f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor QualType ParamIn, QualType ArgIn, 8642a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 8655f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 8665c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned TDF, 8675c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool PartialOrdering, 8685f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<RefParamPartialOrderingComparison> *RefParamComparisons) { 8690b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // We only want to look at the canonical types, since typedefs and 8700b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // sugar are not part of template argument deduction. 871a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth QualType Param = S.Context.getCanonicalType(ParamIn); 872a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth QualType Arg = S.Context.getCanonicalType(ArgIn); 8730b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 87477d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the argument type is a pack expansion, look at its pattern. 875dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // This isn't explicitly called out 87677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (const PackExpansionType *ArgExpansion 87777d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor = dyn_cast<PackExpansionType>(Arg)) 87877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Arg = ArgExpansion->getPattern(); 879dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 8805c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (PartialOrdering) { 8815c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p5: 882dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Before the partial ordering is done, certain transformations are 883dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // performed on the types used for partial ordering: 884dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If P is a reference type, P is replaced by the type referred to. 8855c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor const ReferenceType *ParamRef = Param->getAs<ReferenceType>(); 8865c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (ParamRef) 8875c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = ParamRef->getPointeeType(); 888dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 8895c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // - If A is a reference type, A is replaced by the type referred to. 8905c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor const ReferenceType *ArgRef = Arg->getAs<ReferenceType>(); 8915c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (ArgRef) 8925c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Arg = ArgRef->getPointeeType(); 893dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 894b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (RefParamComparisons && ParamRef && ArgRef) { 8955c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p6: 896dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If both P and A were reference types (before being replaced with the 897dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // type referred to above), determine which of the two types (if any) is 8985c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // more cv-qualified than the other; otherwise the types are considered 899dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // to be equally cv-qualified for partial ordering purposes. The result 9005c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // of this determination will be used below. 9015c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // 902dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // We save this information for later, using it only when deduction 9035c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // succeeds in both directions. 904b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamPartialOrderingComparison Comparison; 905b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.ParamIsRvalueRef = ParamRef->getAs<RValueReferenceType>(); 906b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.ArgIsRvalueRef = ArgRef->getAs<RValueReferenceType>(); 907b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = NeitherMoreQualified; 908769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor 909769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor Qualifiers ParamQuals = Param.getQualifiers(); 910769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor Qualifiers ArgQuals = Arg.getQualifiers(); 911769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor if (ParamQuals.isStrictSupersetOf(ArgQuals)) 912b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = ParamMoreQualified; 913769d0cc72b1831785596d0e76f327bdb887823beDouglas Gregor else if (ArgQuals.isStrictSupersetOf(ParamQuals)) 914b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Comparison.Qualifiers = ArgMoreQualified; 915b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons->push_back(Comparison); 9165c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } 917dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 9185c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.partial]p7: 9195c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // Remove any top-level cv-qualifiers: 920dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If P is a cv-qualified type, P is replaced by the cv-unqualified 9215c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // version of P. 9225c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = Param.getUnqualifiedType(); 923dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // - If A is a cv-qualified type, A is replaced by the cv-unqualified 9245c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // version of A. 9255c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Arg = Arg.getUnqualifiedType(); 9265c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } else { 9275c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++0x [temp.deduct.call]p4 bullet 1: 9285c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // - If the original P is a reference type, the deduced A (i.e., the type 9295c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // referred to by the reference) can be more cv-qualified than the 9305c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // transformed A. 9315c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (TDF & TDF_ParamWithReferenceType) { 9325c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Qualifiers Quals; 9335c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor QualType UnqualParam = S.Context.getUnqualifiedArrayType(Param, Quals); 9345c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Quals.setCVRQualifiers(Quals.getCVRQualifiers() & 93562c28c831bbf207cc36e683e7c321fc33bf8928cJohn McCall Arg.getCVRQualifiers()); 9365c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Param = S.Context.getQualifiedType(UnqualParam, Quals); 9375c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor } 938dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 93973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if ((TDF & TDF_TopLevelParameterTypeList) && !Param->isFunctionType()) { 94073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // C++0x [temp.deduct.type]p10: 94173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // If P and A are function types that originated from deduction when 94273b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // taking the address of a function template (14.8.2.2) or when deducing 94373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // template arguments from a function declaration (14.8.2.6) and Pi and 944dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Ai are parameters of the top-level parameter-type-list of P and A, 945dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // respectively, Pi is adjusted if it is an rvalue reference to a 946dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // cv-unqualified template parameter and Ai is an lvalue reference, in 947dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // which case the type of Pi is changed to be the template parameter 94873b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // type (i.e., T&& is changed to simply T). [ Note: As a result, when 94973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor // Pi is T&& and Ai is X&, the adjusted Pi will be T, causing T to be 9500099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // deduced as X&. - end note ] 95173b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor TDF &= ~TDF_TopLevelParameterTypeList; 952dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 95373b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (const RValueReferenceType *ParamRef 95473b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor = Param->getAs<RValueReferenceType>()) { 95573b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (isa<TemplateTypeParmType>(ParamRef->getPointeeType()) && 95673b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor !ParamRef->getPointeeType().getQualifiers()) 95773b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor if (Arg->isLValueReferenceType()) 95873b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Param = ParamRef->getPointeeType(); 95973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor } 96073b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor } 961500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor } 962dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 963f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor // If the parameter type is not dependent, there is nothing to deduce. 9641282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor if (!Param->isDependentType()) { 9653cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor if (!(TDF & TDF_SkipNonDependent) && Param != Arg) 9661282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor return Sema::TDK_NonDeducedMismatch; 967dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 968f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Sema::TDK_Success; 9691282029f3d37f482bbba3c38ea9da17a78d11d40Douglas Gregor } 9700b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 971199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // C++ [temp.deduct.type]p9: 9721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // A template type argument T, a template template argument TT or a 9731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // template non-type argument i can be deduced if P and A have one of 974199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // the following forms: 975199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // 976199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T 977199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // cv-list T 9781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateTypeParmType *TemplateTypeParm 979183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Param->getAs<TemplateTypeParmType>()) { 980af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor // Just skip any attempts to deduce from a placeholder type. 981af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor if (Arg->isPlaceholderType()) 982af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor return Sema::TDK_Success; 983af130823cbac5c02f7fe57a5733ee511f5a3ac98Douglas Gregor 984f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor unsigned Index = TemplateTypeParm->getIndex(); 985f290e0db835a619014538c41ed552696efc0e977Douglas Gregor bool RecanonicalizeArg = false; 9861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9879e9fae4b8af47c15696da4ea3c30102e3a035179Douglas Gregor // If the argument type is an array type, move the qualifiers up to the 9889e9fae4b8af47c15696da4ea3c30102e3a035179Douglas Gregor // top level, so they can be matched with the qualifiers on the parameter. 989f290e0db835a619014538c41ed552696efc0e977Douglas Gregor if (isa<ArrayType>(Arg)) { 9900953e767ff7817f97b3ab20896b229891eeff45bJohn McCall Qualifiers Quals; 991a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth Arg = S.Context.getUnqualifiedArrayType(Arg, Quals); 9920953e767ff7817f97b3ab20896b229891eeff45bJohn McCall if (Quals) { 993a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth Arg = S.Context.getQualifiedType(Arg, Quals); 994f290e0db835a619014538c41ed552696efc0e977Douglas Gregor RecanonicalizeArg = true; 995f290e0db835a619014538c41ed552696efc0e977Douglas Gregor } 996f290e0db835a619014538c41ed552696efc0e977Douglas Gregor } 9971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9980b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // The argument type can not be less qualified than the parameter 9990b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor // type. 100061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (!(TDF & TDF_IgnoreQualifiers) && 100161d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor hasInconsistentOrSupersetQualifiersOf(Param, Arg)) { 1002f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 100357e97786433e70197a089360228d8f0d82e3ad4cJohn McCall Info.FirstArg = TemplateArgument(Param); 1004833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.SecondArg = TemplateArgument(Arg); 100557e97786433e70197a089360228d8f0d82e3ad4cJohn McCall return Sema::TDK_Underqualified; 1006f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 10070b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 10080b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor assert(TemplateTypeParm->getDepth() == 0 && "Can't deduce with depth > 0"); 1009a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth assert(Arg != S.Context.OverloadTy && "Unresolved overloaded function"); 10100953e767ff7817f97b3ab20896b229891eeff45bJohn McCall QualType DeducedType = Arg; 101149f4e1cbd839da27ff4814b4ea6d85a79f786cbdJohn McCall 101261d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // Remove any qualifiers on the parameter from the deduced type. 101361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor // We checked the qualifiers for consistency above. 101461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers DeducedQs = DeducedType.getQualifiers(); 101561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor Qualifiers ParamQs = Param.getQualifiers(); 101661d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeCVRQualifiers(ParamQs.getCVRQualifiers()); 101761d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.hasObjCGCAttr()) 101861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeObjCGCAttr(); 101961d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (ParamQs.hasAddressSpace()) 102061d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs.removeAddressSpace(); 1021f85e193739c953358c865005855253af4f68a497John McCall if (ParamQs.hasObjCLifetime()) 1022f85e193739c953358c865005855253af4f68a497John McCall DeducedQs.removeObjCLifetime(); 1023e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor 1024e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor // Objective-C ARC: 1025da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor // If template deduction would produce a lifetime qualifier on a type 1026da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor // that is not a lifetime type, template argument deduction fails. 1027da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor if (ParamQs.hasObjCLifetime() && !DeducedType->isObjCLifetimeType() && 1028da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor !DeducedType->isDependentType()) { 1029da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 1030da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor Info.FirstArg = TemplateArgument(Param); 1031da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor Info.SecondArg = TemplateArgument(Arg); 1032da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor return Sema::TDK_Underqualified; 1033da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor } 1034da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor 1035da8b24961acfbeff47f585109b7559ba60e574cbDouglas Gregor // Objective-C ARC: 1036e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor // If template deduction would produce an argument type with lifetime type 1037e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor // but no lifetime qualifier, the __strong lifetime qualifier is inferred. 1038e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor if (S.getLangOptions().ObjCAutoRefCount && 1039e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor DeducedType->isObjCLifetimeType() && 1040e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor !DeducedQs.hasObjCLifetime()) 1041e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor DeducedQs.setObjCLifetime(Qualifiers::OCL_Strong); 1042e559ca1672ecef59345a928af0a6809b09282d2cDouglas Gregor 104361d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedType = S.Context.getQualifiedType(DeducedType.getUnqualifiedType(), 104461d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor DeducedQs); 104561d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor 1046f290e0db835a619014538c41ed552696efc0e977Douglas Gregor if (RecanonicalizeArg) 1047a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth DeducedType = S.Context.getCanonicalType(DeducedType); 10481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10490d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor DeducedTemplateArgument NewDeduced(DeducedType); 1050dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, 10510d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[Index], 10520d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor NewDeduced); 10530d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor if (Result.isNull()) { 10540d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); 10550d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.FirstArg = Deduced[Index]; 10560d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Info.SecondArg = NewDeduced; 1057dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Inconsistent; 10580b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 1059dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 10600d80abc3b7fb0dca26fb6b272d2c3484f86fb7e7Douglas Gregor Deduced[Index] = Result; 1061dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Sema::TDK_Success; 10620b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 10630b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1064f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor // Set up the template argument deduction information for a failure. 1065833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.FirstArg = TemplateArgument(ParamIn); 1066833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall Info.SecondArg = TemplateArgument(ArgIn); 1067f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 10680bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // If the parameter is an already-substituted template parameter 10690bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // pack, do nothing: we don't know which of its arguments to look 10700bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // at, so we have to wait until all of the parameter packs in this 10710bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor // expansion have arguments. 10720bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor if (isa<SubstTemplateTypeParmPackType>(Param)) 10730bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor return Sema::TDK_Success; 10740bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor 1075508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor // Check the cv-qualifiers on the parameter and argument types. 1076508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (!(TDF & TDF_IgnoreQualifiers)) { 1077508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (TDF & TDF_ParamWithReferenceType) { 107861d0b6baf47cf411f6c0f6ddb4acffcfeec724f1Douglas Gregor if (hasInconsistentOrSupersetQualifiersOf(Param, Arg)) 1079508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1080cd05e81e2e2640a0a0097658c660afc6c8a9f4fdJohn McCall } else if (!IsPossiblyOpaquelyQualifiedType(Param)) { 1081508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor if (Param.getCVRQualifiers() != Arg.getCVRQualifiers()) 10821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return Sema::TDK_NonDeducedMismatch; 1083508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor } 1084508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor } 10850b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1086d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor switch (Param->getTypeClass()) { 10874ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Non-canonical types cannot appear here. 10884ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor#define NON_CANONICAL_TYPE(Class, Base) \ 10894ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Class: llvm_unreachable("deducing non-canonical type: " #Class); 10904ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor#define TYPE(Class, Base) 10914ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor#include "clang/AST/TypeNodes.def" 10924ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 10934ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::TemplateTypeParm: 10944ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::SubstTemplateTypeParmPack: 10954ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor llvm_unreachable("Type nodes handled above"); 10964ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 10974ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // These types cannot be used in templates or cannot be dependent, so 10984ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // deduction always fails. 1099199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case Type::Builtin: 11004ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::VariableArray: 11014ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Vector: 11024ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::FunctionNoProto: 11034ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Record: 11044ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Enum: 11054ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ObjCObject: 11064ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ObjCInterface: 11074ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ObjCObjectPointer: 1108f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11104ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // _Complex T [placeholder extension] 11114ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Complex: 11124ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const ComplexType *ComplexArg = Arg->getAs<ComplexType>()) 11134ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return DeduceTemplateArguments(S, TemplateParams, 11144ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor cast<ComplexType>(Param)->getElementType(), 11154ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor ComplexArg->getElementType(), 11164ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor Info, Deduced, TDF); 11174ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 11184ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1119b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 1120b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman // _Atomic T [extension] 1121b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman case Type::Atomic: 1122b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman if (const AtomicType *AtomicArg = Arg->getAs<AtomicType>()) 1123b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman return DeduceTemplateArguments(S, TemplateParams, 1124b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman cast<AtomicType>(Param)->getValueType(), 1125b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman AtomicArg->getValueType(), 1126b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman Info, Deduced, TDF); 1127b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 1128b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman return Sema::TDK_NonDeducedMismatch; 1129b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 1130199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T * 1131d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::Pointer: { 1132c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall QualType PointeeType; 1133c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall if (const PointerType *PointerArg = Arg->getAs<PointerType>()) { 1134c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType = PointerArg->getPointeeType(); 1135c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } else if (const ObjCObjectPointerType *PointerArg 1136c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall = Arg->getAs<ObjCObjectPointerType>()) { 1137c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType = PointerArg->getPointeeType(); 1138c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } else { 1139f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1140c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall } 11411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11424112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor unsigned SubTDF = TDF & (TDF_IgnoreQualifiers | TDF_DerivedClass); 1143a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1144d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor cast<PointerType>(Param)->getPointeeType(), 1145c0008349f233e70e3ffabe7b31eab5d9859bc25fJohn McCall PointeeType, 11464112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor Info, Deduced, SubTDF); 1147d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1149199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T & 1150d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::LValueReference: { 11516217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const LValueReferenceType *ReferenceArg = Arg->getAs<LValueReferenceType>(); 1152d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor if (!ReferenceArg) 1153f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1155a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1156d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor cast<LValueReferenceType>(Param)->getPointeeType(), 1157d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor ReferenceArg->getPointeeType(), 1158508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 0); 1159d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11600b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1161199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T && [C++0x] 1162d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor case Type::RValueReference: { 11636217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek const RValueReferenceType *ReferenceArg = Arg->getAs<RValueReferenceType>(); 1164d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor if (!ReferenceArg) 1165f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1167a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1168d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor cast<RValueReferenceType>(Param)->getPointeeType(), 1169d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor ReferenceArg->getPointeeType(), 1170508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 0); 1171d560d5025a0e5b1942d99d5f39005337b03a64c2Douglas Gregor } 11721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1173199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T [] (implied, but not stated explicitly) 11744d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson case Type::IncompleteArray: { 11751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const IncompleteArrayType *IncompleteArrayArg = 1176a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsIncompleteArrayType(Arg); 11774d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (!IncompleteArrayArg) 1178f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1180e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1181a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1182a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsIncompleteArrayType(Param)->getElementType(), 11834d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson IncompleteArrayArg->getElementType(), 1184e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall Info, Deduced, SubTDF); 11854d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson } 1186199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1187199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // T [integer-constant] 11884d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson case Type::ConstantArray: { 11891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const ConstantArrayType *ConstantArrayArg = 1190a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsConstantArrayType(Arg); 11914d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (!ConstantArrayArg) 1192f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const ConstantArrayType *ConstantArrayParm = 1195a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth S.Context.getAsConstantArrayType(Param); 11964d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson if (ConstantArrayArg->getSize() != ConstantArrayParm->getSize()) 1197f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 11981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1199e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1200a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 12014d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson ConstantArrayParm->getElementType(), 12024d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson ConstantArrayArg->getElementType(), 1203e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall Info, Deduced, SubTDF); 12044d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson } 12054d6fb501ffc0568ca5ca7266005e96a6f1273845Anders Carlsson 1206199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // type [i] 1207199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case Type::DependentSizedArray: { 1208a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth const ArrayType *ArrayArg = S.Context.getAsArrayType(Arg); 1209199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (!ArrayArg) 1210f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 12111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1212e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall unsigned SubTDF = TDF & TDF_IgnoreQualifiers; 1213e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall 1214199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Check the element type of the arrays 1215199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor const DependentSizedArrayType *DependentArrayParm 1216a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = S.Context.getAsDependentSizedArrayType(Param); 1217f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1218a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 1219f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor DependentArrayParm->getElementType(), 1220f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor ArrayArg->getElementType(), 1221e4f26e54d81fb1987333132fe34cd927e62c803cJohn McCall Info, Deduced, SubTDF)) 1222f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 12231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1224199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Determine the array bound is something we can deduce. 12251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NonTypeTemplateParmDecl *NTTP 1226199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = getDeducedParameterFromExpr(DependentArrayParm->getSizeExpr()); 1227199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (!NTTP) 1228f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 12291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // We can perform template argument deduction for the given non-type 1231199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // template parameter. 12321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(NTTP->getDepth() == 0 && 1233199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor "Cannot deduce non-type template argument at depth > 0"); 12341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const ConstantArrayType *ConstantArrayArg 1235335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson = dyn_cast<ConstantArrayType>(ArrayArg)) { 1236335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson llvm::APSInt Size(ConstantArrayArg->getSize()); 1237dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceNonTypeTemplateArgument(S, NTTP, Size, 12389d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor S.Context.getSizeType(), 123902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor /*ArrayBound=*/true, 1240f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 1241335e24a194f2000086d298b800d6169ebc5a7ee6Anders Carlsson } 1242199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (const DependentSizedArrayType *DependentArrayArg 1243199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = dyn_cast<DependentSizedArrayType>(ArrayArg)) 124434c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor if (DependentArrayArg->getSizeExpr()) 124534c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, 124634c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor DependentArrayArg->getSizeExpr(), 124734c2f8c8a16226f757947bf08c5f799d99c9ac1eDouglas Gregor Info, Deduced); 12481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1249199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Incomplete type does not match a dependently-sized array type 1250f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1251199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 12521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // type(*)(T) 12541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(*)() 12551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(*)(T) 1256a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson case Type::FunctionProto: { 125773b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor unsigned SubTDF = TDF & TDF_TopLevelParameterTypeList; 12581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *FunctionProtoArg = 1259a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson dyn_cast<FunctionProtoType>(Arg); 1260a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson if (!FunctionProtoArg) 1261f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 12621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *FunctionProtoParam = 1264a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson cast<FunctionProtoType>(Param); 1265994b6cb65c9daba2128366bc4c64be6dbf953528Anders Carlsson 1266dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (FunctionProtoParam->getTypeQuals() 1267e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor != FunctionProtoArg->getTypeQuals() || 1268dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionProtoParam->getRefQualifier() 1269e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor != FunctionProtoArg->getRefQualifier() || 1270e3c7a7ca66c02567543dbb5ec493818e00e8b177Douglas Gregor FunctionProtoParam->isVariadic() != FunctionProtoArg->isVariadic()) 1271f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1272994b6cb65c9daba2128366bc4c64be6dbf953528Anders Carlsson 1273a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson // Check return types. 1274f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1275a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 1276f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor FunctionProtoParam->getResultType(), 1277f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor FunctionProtoArg->getResultType(), 1278508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 0)) 1279f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 12801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1281603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor return DeduceTemplateArguments(S, TemplateParams, 1282603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoParam->arg_type_begin(), 1283603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoParam->getNumArgs(), 1284603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoArg->arg_type_begin(), 1285603cfb4da2f7ba08a1c3452c2fbf70585b8e7621Douglas Gregor FunctionProtoArg->getNumArgs(), 128673b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Info, Deduced, SubTDF); 1287a27fad59dc760252af025ef6a86d31bb7d11a44aAnders Carlsson } 12881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12893cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall case Type::InjectedClassName: { 12903cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // Treat a template's injected-class-name as if the template 12913cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // specialization type had been used. 129231f17ecbef57b5679c017c375db330546b7b5145John McCall Param = cast<InjectedClassNameType>(Param) 129331f17ecbef57b5679c017c375db330546b7b5145John McCall ->getInjectedSpecializationType(); 12943cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall assert(isa<TemplateSpecializationType>(Param) && 12953cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall "injected class name is not a template specialization type"); 12963cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall // fall through 12973cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall } 12983cb0ebd5f76abcb776f7cb4062bd79e3268c0dc4John McCall 1299f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor // template-name<T> (where template-name refers to a class template) 1300d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor // template-name<i> 1301db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<T> 1302db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<i> 1303db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor // TT<> 1304d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor case Type::TemplateSpecialization: { 1305d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor const TemplateSpecializationType *SpecParam 1306d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor = cast<TemplateSpecializationType>(Param); 13071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1308de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Try to deduce template arguments from the template-id. 1309de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Sema::TemplateDeductionResult Result 1310a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, SpecParam, Arg, 1311de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Info, Deduced); 13121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13134a5c15f75f76b95e1c2ceb6fa2737dcadd5f4be1Douglas Gregor if (Result && (TDF & TDF_DerivedClass)) { 1314de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // C++ [temp.deduct.call]p3b3: 1315de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If P is a class, and P has the form template-id, then A can be a 1316de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // derived class of the deduced A. Likewise, if P is a pointer to a 13171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // class of the form template-id, A can be a pointer to a derived 1318de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // class pointed to by the deduced A. 1319de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // 1320de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // More importantly: 13211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // These alternatives are considered only if type deduction would 1322de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // otherwise fail. 1323a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth if (const RecordType *RecordT = Arg->getAs<RecordType>()) { 1324a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // We cannot inspect base classes as part of deduction when the type 1325a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // is incomplete, so either instantiate any templates necessary to 1326a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth // complete the type, or skip over it if it cannot be completed. 13275769d6195087229770d7ac90449443e026c47103John McCall if (S.RequireCompleteType(Info.getLocation(), Arg, 0)) 1328a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return Result; 1329a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth 1330de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Use data recursion to crawl through the list of base classes. 13311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Visited contains the set of nodes we have already visited, while 1332de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // ToVisit is our stack of records that we still need to visit. 1333de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor llvm::SmallPtrSet<const RecordType *, 8> Visited; 13345f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<const RecordType *, 8> ToVisit; 1335de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor ToVisit.push_back(RecordT); 1336de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor bool Successful = false; 13375f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> DeducedOrig(0); 1338053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor DeducedOrig = Deduced; 1339de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor while (!ToVisit.empty()) { 1340de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Retrieve the next class in the inheritance hierarchy. 1341de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor const RecordType *NextT = ToVisit.back(); 1342de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor ToVisit.pop_back(); 13431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1344de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If we have already seen this type, skip it. 1345de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (!Visited.insert(NextT)) 1346de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor continue; 13471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1348de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If this is a base class, try to perform template argument 1349de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // deduction from it. 1350de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (NextT != RecordT) { 1351de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Sema::TemplateDeductionResult BaseResult 1352a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, SpecParam, 1353de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor QualType(NextT, 0), Info, Deduced); 13541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1355de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // If template argument deduction for this base was successful, 1356053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor // note that we had some success. Otherwise, ignore any deductions 1357053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor // from this base class. 1358053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor if (BaseResult == Sema::TDK_Success) { 1359de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor Successful = true; 1360053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor DeducedOrig = Deduced; 1361053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor } 1362053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor else 1363053105d58552c600a2e56473592212a9bddafcd4Douglas Gregor Deduced = DeducedOrig; 1364de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1366de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor // Visit base classes 1367de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor CXXRecordDecl *Next = cast<CXXRecordDecl>(NextT->getDecl()); 1368de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor for (CXXRecordDecl::base_class_iterator Base = Next->bases_begin(), 1369de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor BaseEnd = Next->bases_end(); 13709994a34f6cf842721ba7723edc0b9036229fe387Sebastian Redl Base != BaseEnd; ++Base) { 13711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump assert(Base->getType()->isRecordType() && 1372de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor "Base class that isn't a record?"); 13736217b80b7a1379b74cced1c076338262c3c980b3Ted Kremenek ToVisit.push_back(Base->getType()->getAs<RecordType>()); 1374de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 1375de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1377de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor if (Successful) 1378de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Sema::TDK_Success; 1379de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1381de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor } 13821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1383de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor return Result; 1384d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor } 1385d708c72e3e5186662fb0045d2bd666bfd93a013dDouglas Gregor 1386637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T type::* 1387637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T T::* 1388637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (type::*)() 1389637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (T::*)() 1390637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (type::*)(T) 1391637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // type (T::*)(T) 1392637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (type::*)(T) 1393637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (T::*)() 1394637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // T (T::*)(T) 1395637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::MemberPointer: { 1396637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor const MemberPointerType *MemPtrParam = cast<MemberPointerType>(Param); 1397637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor const MemberPointerType *MemPtrArg = dyn_cast<MemberPointerType>(Arg); 1398637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor if (!MemPtrArg) 1399f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1400f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1401f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Sema::TemplateDeductionResult Result 1402a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 1403f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor MemPtrParam->getPointeeType(), 1404f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor MemPtrArg->getPointeeType(), 1405508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 1406508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor TDF & TDF_IgnoreQualifiers)) 1407f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Result; 1408f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1409a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1410f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor QualType(MemPtrParam->getClass(), 0), 1411f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor QualType(MemPtrArg->getClass(), 0), 1412508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Info, Deduced, 0); 1413637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor } 1414637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor 14159a917e4fac79aba20fbd25983c78396475078918Anders Carlsson // (clang extension) 14169a917e4fac79aba20fbd25983c78396475078918Anders Carlsson // 14171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // type(^)(T) 14181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(^)() 14191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // T(^)(T) 1420859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson case Type::BlockPointer: { 1421859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson const BlockPointerType *BlockPtrParam = cast<BlockPointerType>(Param); 1422859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson const BlockPointerType *BlockPtrArg = dyn_cast<BlockPointerType>(Arg); 14231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1424859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson if (!BlockPtrArg) 1425f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 14261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1427a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, 1428859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson BlockPtrParam->getPointeeType(), 1429f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor BlockPtrArg->getPointeeType(), Info, 1430508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor Deduced, 0); 1431859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson } 1432859ba504e754436e1ccf81f50800e5d2ea647447Anders Carlsson 14334ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // (clang extension) 14344ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // 14354ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // T __attribute__(((ext_vector_type(<integral constant>)))) 14364ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::ExtVector: { 14374ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor const ExtVectorType *VectorParam = cast<ExtVectorType>(Param); 14384ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { 14394ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Make sure that the vectors have the same number of elements. 14404ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (VectorParam->getNumElements() != VectorArg->getNumElements()) 14414ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 14424ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14434ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 14444ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return DeduceTemplateArguments(S, TemplateParams, 14454ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor VectorParam->getElementType(), 14464ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor VectorArg->getElementType(), 14474ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor Info, Deduced, 14484ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor TDF); 14494ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14504ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14514ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const DependentSizedExtVectorType *VectorArg 14524ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = dyn_cast<DependentSizedExtVectorType>(Arg)) { 14534ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // We can't check the number of elements, since the argument has a 14544ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // dependent number of elements. This can only occur during partial 14554ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // ordering. 14564ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14574ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 14584ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return DeduceTemplateArguments(S, TemplateParams, 14594ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor VectorParam->getElementType(), 14604ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor VectorArg->getElementType(), 14614ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor Info, Deduced, 14624ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor TDF); 14634ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14644ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14654ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 14664ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14674ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14684ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // (clang extension) 14694ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // 14704ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // T __attribute__(((ext_vector_type(N)))) 14714ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::DependentSizedExtVector: { 14724ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor const DependentSizedExtVectorType *VectorParam 14734ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = cast<DependentSizedExtVectorType>(Param); 14744ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14754ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { 14764ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 14774ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (Sema::TemplateDeductionResult Result 14784ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, 14794ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor VectorParam->getElementType(), 14804ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor VectorArg->getElementType(), 14814ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor Info, Deduced, 14824ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor TDF)) 14834ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Result; 14844ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14854ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the vector size, if we can. 14864ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor NonTypeTemplateParmDecl *NTTP 14874ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = getDeducedParameterFromExpr(VectorParam->getSizeExpr()); 14884ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (!NTTP) 14894ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_Success; 14904ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14914ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor llvm::APSInt ArgSize(S.Context.getTypeSize(S.Context.IntTy), false); 14924ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor ArgSize = VectorArg->getNumElements(); 14934ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, ArgSize, S.Context.IntTy, 14944ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor false, Info, Deduced); 14954ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 14964ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 14974ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (const DependentSizedExtVectorType *VectorArg 14984ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = dyn_cast<DependentSizedExtVectorType>(Arg)) { 14994ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the element types. 15004ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (Sema::TemplateDeductionResult Result 15014ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, 15024ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor VectorParam->getElementType(), 15034ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor VectorArg->getElementType(), 15044ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor Info, Deduced, 15054ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor TDF)) 15064ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Result; 15074ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15084ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor // Perform deduction on the vector size, if we can. 15094ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor NonTypeTemplateParmDecl *NTTP 15104ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor = getDeducedParameterFromExpr(VectorParam->getSizeExpr()); 15114ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor if (!NTTP) 15124ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_Success; 15134ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15144ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return DeduceNonTypeTemplateArgument(S, NTTP, VectorArg->getSizeExpr(), 15154ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor Info, Deduced); 15164ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 15174ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 15184ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor return Sema::TDK_NonDeducedMismatch; 15194ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor } 15204ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor 1521637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::TypeOfExpr: 1522637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor case Type::TypeOf: 15234714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor case Type::DependentName: 15244ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::UnresolvedUsing: 15254ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Decltype: 15264ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::UnaryTransform: 15274ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::Auto: 15284ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::DependentTemplateSpecialization: 15294ac01401b1ec602a1f58c217544d3dcb5fcbd7f1Douglas Gregor case Type::PackExpansion: 1530637a4097f61b09d6ccf619298d9d121fafa044e4Douglas Gregor // No template argument deduction for these types 1531f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 15320b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 15330b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1534f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Sema::TDK_Success; 15350b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 15360b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 1537f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregorstatic Sema::TemplateDeductionResult 1538a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 1539f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 1540f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor const TemplateArgument &Param, 154177d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor TemplateArgument Arg, 15422a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 15435f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 154477d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // If the template argument is a pack expansion, perform template argument 154577d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // deduction against the pattern of that expansion. This only occurs during 154677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // partial ordering. 154777d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (Arg.isPackExpansion()) 154877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Arg = Arg.getPackExpansionPattern(); 1549dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 15500b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor switch (Param.getKind()) { 1551199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Null: 1552b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Null template argument in parameter list"); 15531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 15541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case TemplateArgument::Type: 1555788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (Arg.getKind() == TemplateArgument::Type) 1556a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceTemplateArguments(S, TemplateParams, Param.getAsType(), 1557788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Arg.getAsType(), Info, Deduced, 0); 1558788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.FirstArg = Param; 1559788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.SecondArg = Arg; 1560788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1561a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 1562788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 1563db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor if (Arg.getKind() == TemplateArgument::Template) 1564dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 1565788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Param.getAsTemplate(), 1566db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Arg.getAsTemplate(), Info, Deduced); 1567788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.FirstArg = Param; 1568788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Info.SecondArg = Arg; 1569788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 1570a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 1571a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 1572a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor llvm_unreachable("caller should handle pack expansions"); 1573a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor break; 1574dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1575199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Declaration: 1576788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (Arg.getKind() == TemplateArgument::Declaration && 1577788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Param.getAsDecl()->getCanonicalDecl() == 1578788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Arg.getAsDecl()->getCanonicalDecl()) 1579788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return Sema::TDK_Success; 1580dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1581f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1582f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1583f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 15841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1585199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Integral: 1586199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Integral) { 15879d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor if (hasSameExtendedValue(*Param.getAsIntegral(), *Arg.getAsIntegral())) 1588f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 1589f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1590f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1591f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1592f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1593f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 1594f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor 1595f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Arg.getKind() == TemplateArgument::Expression) { 1596f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1597f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1598f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1599199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 1600199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor 1601f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1602f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1603f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 16041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1605199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor case TemplateArgument::Expression: { 16061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (NonTypeTemplateParmDecl *NTTP 1607199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor = getDeducedParameterFromExpr(Param.getAsExpr())) { 1608199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Integral) 1609a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, 16101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump *Arg.getAsIntegral(), 16119d0e441036de0faa59d8039ce0c9967bda112c7fDouglas Gregor Arg.getIntegralType(), 161202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor /*ArrayBound=*/false, 1613f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 1614199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor if (Arg.getKind() == TemplateArgument::Expression) 1615a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsExpr(), 1616f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info, Deduced); 161715755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor if (Arg.getKind() == TemplateArgument::Declaration) 1618a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsDecl(), 161915755cb8399afa702575a21915daf2f6e56b5ac1Douglas Gregor Info, Deduced); 1620dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1621f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.FirstArg = Param; 1622f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.SecondArg = Arg; 1623f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1624199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 16251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1626199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor // Can't deduce anything, but that's okay. 1627f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 1628199d99192fbcca9f043596c40ead4afab4999dbaDouglas Gregor } 1629d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson case TemplateArgument::Pack: 163020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor llvm_unreachable("Argument packs should be expanded by the caller!"); 16310b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 16321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1633f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 16340b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 16350b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 163620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \brief Determine whether there is a template argument to be used for 163720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// deduction. 163820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// 163920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// This routine "expands" argument packs in-place, overriding its input 164020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// parameters so that \c Args[ArgIdx] will be the available template argument. 164120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// 164220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \returns true if there is another template argument (which will be at 164320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor/// \c Args[ArgIdx]), false otherwise. 1644dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic bool hasTemplateArgumentForDeduction(const TemplateArgument *&Args, 164520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned &ArgIdx, 164620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned &NumArgs) { 164720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (ArgIdx == NumArgs) 164820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return false; 1649dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 165020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument &Arg = Args[ArgIdx]; 165120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (Arg.getKind() != TemplateArgument::Pack) 165220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return true; 165320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 165420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor assert(ArgIdx == NumArgs - 1 && "Pack not at the end of argument list?"); 165520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Args = Arg.pack_begin(); 165620a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor NumArgs = Arg.pack_size(); 165720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ArgIdx = 0; 165820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor return ArgIdx < NumArgs; 165920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor} 166020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 16617b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor/// \brief Determine whether the given set of template arguments has a pack 16627b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor/// expansion that is not the last template argument. 16637b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregorstatic bool hasPackExpansionBeforeEnd(const TemplateArgument *Args, 16647b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor unsigned NumArgs) { 16657b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor unsigned ArgIdx = 0; 16667b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor while (ArgIdx < NumArgs) { 16677b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor const TemplateArgument &Arg = Args[ArgIdx]; 1668dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16697b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // Unwrap argument packs. 16707b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (Args[ArgIdx].getKind() == TemplateArgument::Pack) { 16717b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor Args = Arg.pack_begin(); 16727b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor NumArgs = Arg.pack_size(); 16737b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor ArgIdx = 0; 16747b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor continue; 16757b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor } 1676dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16777b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor ++ArgIdx; 16787b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (ArgIdx == NumArgs) 16797b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return false; 1680dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16817b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (Arg.isPackExpansion()) 16827b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return true; 16837b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor } 1684dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 16857b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return false; 16867b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor} 16877b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 16881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic Sema::TemplateDeductionResult 1689a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler CarruthDeduceTemplateArguments(Sema &S, 1690f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor TemplateParameterList *TemplateParams, 169120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Params, unsigned NumParams, 169220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgument *Args, unsigned NumArgs, 16932a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info, 16945f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 16950972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor bool NumberOfArgumentsMustMatch) { 1696e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1697dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 1698dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 1699e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // non-deduced context. 17007b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor if (hasPackExpansionBeforeEnd(Params, NumParams)) 17017b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return Sema::TDK_Success; 1702dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1703e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1704dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If P has a form that contains <T> or <i>, then each argument Pi of the 1705dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // respective template argument list P is compared with the corresponding 1706e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // argument Ai of the corresponding template argument list of A. 170720a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor unsigned ArgIdx = 0, ParamIdx = 0; 1708dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (; hasTemplateArgumentForDeduction(Params, ParamIdx, NumParams); 170920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ++ParamIdx) { 171020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (!Params[ParamIdx].isPackExpansion()) { 1711e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The simple case: deduce template arguments by matching Pi and Ai. 1712dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 171320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Check whether we have enough arguments. 171420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (!hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) 17153cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return NumberOfArgumentsMustMatch? Sema::TDK_NonDeducedMismatch 17160972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor : Sema::TDK_Success; 1717dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 171877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor if (Args[ArgIdx].isPackExpansion()) { 171977d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // FIXME: We follow the logic of C++0x [temp.deduct.type]p22 here, 172077d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor // but applied to pack expansions that are template arguments. 172177d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor return Sema::TDK_NonDeducedMismatch; 172277d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor } 1723dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1724e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Perform deduction for this Pi/Ai pair. 172520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor if (Sema::TemplateDeductionResult Result 172677d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor = DeduceTemplateArguments(S, TemplateParams, 172777d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Params[ParamIdx], Args[ArgIdx], 172877d6bb9e223496aa5288294f34e7225d1f65dddcDouglas Gregor Info, Deduced)) 1729dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 1730dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 173120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // Move to the next argument. 173220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ++ArgIdx; 173320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor continue; 173420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor } 1735dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1736e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The parameter is a pack expansion. 1737dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1738e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // C++0x [temp.deduct.type]p9: 1739dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If Pi is a pack expansion, then the pattern of Pi is compared with 1740dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // each remaining argument in the template argument list of A. Each 1741dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // comparison deduces template arguments for subsequent positions in the 1742e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // template parameter packs expanded by Pi. 1743e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor TemplateArgument Pattern = Params[ParamIdx].getPackExpansionPattern(); 1744dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1745e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Compute the set of template parameter indices that correspond to 1746e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // parameter packs expanded by the pack expansion. 17475f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<unsigned, 2> PackIndices; 1748e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor { 1749e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor llvm::BitVector SawIndices(TemplateParams->size()); 17505f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UnexpandedParameterPack, 2> Unexpanded; 1751e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor S.collectUnexpandedParameterPacks(Pattern, Unexpanded); 1752e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 1753e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor unsigned Depth, Index; 1754e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 1755e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 1756e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor SawIndices[Index] = true; 1757e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor PackIndices.push_back(Index); 1758e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1759e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1760e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1761e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 1762dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1763e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // FIXME: If there are no remaining arguments, we can bail out early 1764e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // and set any deduced parameter packs to an empty argument pack. 1765e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // The latter part of this is a (minor) correctness issue. 1766dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1767e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Save the deduced template arguments for each parameter pack expanded 1768e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // by this pack expansion, then clear out the deduction. 17695f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 2> 1770e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor SavedPacks(PackIndices.size()); 17715f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> 17725429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 1773dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, 17745429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor NewlyDeducedPacks); 1775e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor 1776e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Keep track of the deduced template arguments for each parameter pack 1777dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 1778e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // template argument (the inner SmallVectors). 1779e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor bool HasAnyArguments = false; 1780e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor while (hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) { 1781e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor HasAnyArguments = true; 1782dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1783e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Deduce template arguments from the pattern. 1784dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (Sema::TemplateDeductionResult Result 1785e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor = DeduceTemplateArguments(S, TemplateParams, Pattern, Args[ArgIdx], 1786e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info, Deduced)) 1787e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor return Result; 1788dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1789e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 1790e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 1791e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // for that pack, then clear out the deduced argument. 1792e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 1793e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 1794e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (!DeducedArg.isNull()) { 1795e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 1796e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor DeducedArg = DeducedTemplateArgument(); 1797e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1798e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1799dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1800e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor ++ArgIdx; 1801e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor } 1802dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1803e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 1804e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor // pack expansion. 18050216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 1806dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(S, TemplateParams, HasAnyArguments, 18070216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 18080216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 1809dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 18100b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor } 1811dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 181220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor // If there is an argument remaining, then we had too many arguments. 18130972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor if (NumberOfArgumentsMustMatch && 18140972c867e72171f24052d7b6d307020c065f8a66Douglas Gregor hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) 18153cae5c9a79bfd2e27eb44c32b13dfacd2ce5c66fDouglas Gregor return Sema::TDK_NonDeducedMismatch; 1816dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1817f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor return Sema::TDK_Success; 18180b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 18190b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor 182020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregorstatic Sema::TemplateDeductionResult 182120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas GregorDeduceTemplateArguments(Sema &S, 182220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateParameterList *TemplateParams, 182320a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgumentList &ParamList, 182420a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor const TemplateArgumentList &ArgList, 182520a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor TemplateDeductionInfo &Info, 18265f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced) { 1827dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return DeduceTemplateArguments(S, TemplateParams, 182820a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ParamList.data(), ParamList.size(), 182920a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor ArgList.data(), ArgList.size(), 183020a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor Info, Deduced); 183120a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor} 183220a55e2515ce89ddf9993941f9b5d0f3a6c91b4fDouglas Gregor 1833f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor/// \brief Determine whether two template arguments are the same. 18341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic bool isSameTemplateArg(ASTContext &Context, 1835f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor const TemplateArgument &X, 1836f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor const TemplateArgument &Y) { 1837f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (X.getKind() != Y.getKind()) 1838f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 18391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1840f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor switch (X.getKind()) { 1841f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Null: 1842b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie llvm_unreachable("Comparing NULL template argument"); 18431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1844f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Type: 1845f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return Context.getCanonicalType(X.getAsType()) == 1846f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Context.getCanonicalType(Y.getAsType()); 18471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1848f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Declaration: 184997fbaa2a38804268a024f1a104b43fcf8b4411b0Argyrios Kyrtzidis return X.getAsDecl()->getCanonicalDecl() == 185097fbaa2a38804268a024f1a104b43fcf8b4411b0Argyrios Kyrtzidis Y.getAsDecl()->getCanonicalDecl(); 18511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1852788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 1853a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 1854a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor return Context.getCanonicalTemplateName( 1855a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor X.getAsTemplateOrTemplatePattern()).getAsVoidPointer() == 1856a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Context.getCanonicalTemplateName( 1857a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor Y.getAsTemplateOrTemplatePattern()).getAsVoidPointer(); 1858dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1859f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Integral: 1860f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return *X.getAsIntegral() == *Y.getAsIntegral(); 18611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1862788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Expression: { 1863788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor llvm::FoldingSetNodeID XID, YID; 1864788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor X.getAsExpr()->Profile(XID, Context, true); 1865dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Y.getAsExpr()->Profile(YID, Context, true); 1866788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor return XID == YID; 1867788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor } 18681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1869f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor case TemplateArgument::Pack: 1870f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (X.pack_size() != Y.pack_size()) 1871f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 18721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 18731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (TemplateArgument::pack_iterator XP = X.pack_begin(), 18741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump XPEnd = X.pack_end(), 1875f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor YP = Y.pack_begin(); 18761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump XP != XPEnd; ++XP, ++YP) 1877f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor if (!isSameTemplateArg(Context, *XP, *YP)) 1878f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 1879f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 1880f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return true; 1881f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor } 1882f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 1883f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor return false; 1884f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor} 1885f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor 188654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \brief Allocate a TemplateArgumentLoc where all locations have 188754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// been initialized to the given location. 188854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 188954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param S The semantic analysis object. 189054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 189154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param The template argument we are producing template argument 189254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// location information for. 189354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 189454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param NTTPType For a declaration template argument, the type of 189554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// the non-type template parameter that corresponds to this template 189654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// argument. 189754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// 189854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \param Loc The source location to use for the resulting template 189954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// argument. 1900dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic TemplateArgumentLoc 190154c53cca105ed595e12fecf04e415c3712bda936Douglas GregorgetTrivialTemplateArgumentLoc(Sema &S, 1902dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const TemplateArgument &Arg, 190354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor QualType NTTPType, 190454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor SourceLocation Loc) { 190554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor switch (Arg.getKind()) { 190654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Null: 190754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor llvm_unreachable("Can't get a NULL template argument here"); 190854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor break; 1909dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 191054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Type: 1911dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return TemplateArgumentLoc(Arg, 191254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor S.Context.getTrivialTypeSourceInfo(Arg.getAsType(), Loc)); 1913dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 191454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Declaration: { 191554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Expr *E 1916ba68eca7582a62e3e2ff4b0eba1b2b73a6b80895Douglas Gregor = S.BuildExpressionFromDeclTemplateArgument(Arg, NTTPType, Loc) 191754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor .takeAs<Expr>(); 191854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(TemplateArgument(E), E); 191954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1920dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 192154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Integral: { 192254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Expr *E 1923ba68eca7582a62e3e2ff4b0eba1b2b73a6b80895Douglas Gregor = S.BuildExpressionFromIntegralTemplateArgument(Arg, Loc).takeAs<Expr>(); 192454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(TemplateArgument(E), E); 192554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1926dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1927b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor case TemplateArgument::Template: 1928b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor case TemplateArgument::TemplateExpansion: { 1929b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor NestedNameSpecifierLocBuilder Builder; 1930b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor TemplateName Template = Arg.getAsTemplate(); 1931b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) 1932b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.MakeTrivial(S.Context, DTN->getQualifier(), Loc); 1933b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor else if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName()) 1934b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.MakeTrivial(S.Context, QTN->getQualifier(), Loc); 1935b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1936b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor if (Arg.getKind() == TemplateArgument::Template) 1937b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor return TemplateArgumentLoc(Arg, 1938b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Builder.getWithLocInContext(S.Context), 1939b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Loc); 1940b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1941b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor 1942b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor return TemplateArgumentLoc(Arg, Builder.getWithLocInContext(S.Context), 1943b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor Loc, Loc); 1944b6744efecba58792cce20d2d7b9ee39927c5422eDouglas Gregor } 1945a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor 194654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Expression: 194754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(Arg, Arg.getAsExpr()); 1948dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 194954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor case TemplateArgument::Pack: 195054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(Arg, TemplateArgumentLocInfo()); 195154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1952dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 195354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return TemplateArgumentLoc(); 195454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor} 195554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 195654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 195754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// \brief Convert the given deduced template argument and add it to the set of 195854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor/// fully-converted template arguments. 1959dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumistatic bool ConvertDeducedTemplateArgument(Sema &S, NamedDecl *Param, 196054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor DeducedTemplateArgument Arg, 1961dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NamedDecl *Template, 1962dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi QualType NTTPType, 19636952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor unsigned ArgumentPackIndex, 196454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateDeductionInfo &Info, 196554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor bool InFunctionTemplate, 19665f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<TemplateArgument> &Output) { 196754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor if (Arg.getKind() == TemplateArgument::Pack) { 196854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // This is a template argument pack, so check each of its arguments against 196954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // the template parameter. 19705f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 2> PackedArgsBuilder; 1971dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (TemplateArgument::pack_iterator PA = Arg.pack_begin(), 1972135ffa7375fb5802b92f42774e02d0e6e4c78e5bDouglas Gregor PAEnd = Arg.pack_end(); 197354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor PA != PAEnd; ++PA) { 1974d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // When converting the deduced template argument, append it to the 1975d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // general output list. We need to do this so that the template argument 1976d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // checking logic has all of the prior template arguments available. 197754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor DeducedTemplateArgument InnerArg(*PA); 197854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InnerArg.setDeducedFromArrayBound(Arg.wasDeducedFromArrayBound()); 1979dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (ConvertDeducedTemplateArgument(S, Param, InnerArg, Template, 19806952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor NTTPType, PackedArgsBuilder.size(), 19816952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor Info, InFunctionTemplate, Output)) 198254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return true; 1983dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 1984d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // Move the converted template argument into our argument pack. 1985d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor PackedArgsBuilder.push_back(Output.back()); 1986d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Output.pop_back(); 198754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1988dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 198954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Create the resulting argument pack. 1990dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Output.push_back(TemplateArgument::CreatePackCopy(S.Context, 1991203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor PackedArgsBuilder.data(), 1992203e6a322ae29d577acafcb1572a57ec16e1e730Douglas Gregor PackedArgsBuilder.size())); 199354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return false; 199454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 1995dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 199654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Convert the deduced template argument into a template 199754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // argument that we can check, almost as if the user had written 199854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // the template argument explicitly. 199954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateArgumentLoc ArgLoc = getTrivialTemplateArgumentLoc(S, Arg, NTTPType, 200054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.getLocation()); 2001dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 200254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Check the template argument, converting it as necessary. 200354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return S.CheckTemplateArgument(Param, ArgLoc, 200454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template, 200554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template->getLocation(), 200654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Template->getSourceRange().getEnd(), 20076952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor ArgumentPackIndex, 200854c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Output, 200954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InFunctionTemplate 201054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor ? (Arg.wasDeducedFromArrayBound() 2011dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ? Sema::CTAK_DeducedFromArrayBound 201254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor : Sema::CTAK_Deduced) 201354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor : Sema::CTAK_Specified); 201454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor} 201554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor 201631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// Complete template argument deduction for a class template partial 201731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// specialization. 201831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregorstatic Sema::TemplateDeductionResult 2019dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA TakumiFinishTemplateArgumentDeduction(Sema &S, 202031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor ClassTemplatePartialSpecializationDecl *Partial, 202131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor const TemplateArgumentList &TemplateArgs, 20225f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 20232a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo &Info) { 202431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // Trap errors. 202531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Sema::SFINAETrap Trap(S); 2026dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 202731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Sema::ContextRAII SavedContext(S, Partial); 2028f5813826802c2e76cdc13cae834ebfd4518d74a6John McCall 202902cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // C++ [temp.deduct.type]p2: 203002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // [...] or if any template argument remains neither deduced nor 203102cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // explicitly specified, template argument deduction fails. 20325f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> Builder; 2033033a3cad525e5b221ba035ffc3e0abfa1241d90eDouglas Gregor TemplateParameterList *PartialParams = Partial->getTemplateParameters(); 2034033a3cad525e5b221ba035ffc3e0abfa1241d90eDouglas Gregor for (unsigned I = 0, N = PartialParams->size(); I != N; ++I) { 203554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor NamedDecl *Param = PartialParams->getParam(I); 2036f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor if (Deduced[I].isNull()) { 203754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.Param = makeTemplateParameter(Param); 203831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_Incomplete; 2039f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor } 2040dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 204154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // We have deduced this argument, so it still needs to be 204254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // checked and converted. 2043dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 204454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // First, for a non-type template parameter type that is 204554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // initialized by a declaration, we need the type of the 204654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // corresponding non-type template parameter. 204754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor QualType NTTPType; 2048dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NonTypeTemplateParmDecl *NTTP 2049d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor = dyn_cast<NonTypeTemplateParmDecl>(Param)) { 205054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor NTTPType = NTTP->getType(); 2051d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor if (NTTPType->isDependentType()) { 2052dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, 2053d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Builder.data(), Builder.size()); 2054d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTPType = S.SubstType(NTTPType, 2055d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor MultiLevelTemplateArgumentList(TemplateArgs), 2056d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTP->getLocation(), 2057d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor NTTP->getDeclName()); 2058d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor if (NTTPType.isNull()) { 2059d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Info.Param = makeTemplateParameter(Param); 2060d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor // FIXME: These template arguments are temporary. Free them! 2061dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(S.Context, 2062dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.data(), 2063d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor Builder.size())); 2064d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor return Sema::TDK_SubstitutionFailure; 2065d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 2066d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 2067d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor } 2068d53e16abd1dcaa2942d5183f48e7f63d0e75b35aDouglas Gregor 206954c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor if (ConvertDeducedTemplateArgument(S, Param, Deduced[I], 20706952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor Partial, NTTPType, 0, Info, false, 207154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Builder)) { 207254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor Info.Param = makeTemplateParameter(Param); 207354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2074dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder.data(), 2075dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.size())); 207654c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor return Sema::TDK_SubstitutionFailure; 207754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor } 207802cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor } 2079dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 208002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // Form the template argument list from the deduced template arguments. 20811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *DeducedArgumentList 2082dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = TemplateArgumentList::CreateCopy(S.Context, Builder.data(), 2083910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.size()); 2084910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor 2085f67875d5addf36b951ad37fb04509ab2b572c88aDouglas Gregor Info.reset(DeducedArgumentList); 208602cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor 208702cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // Substitute the deduced template arguments into the template 208802cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // arguments of the class template partial specialization, and 208902cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // verify that the instantiated template arguments are both valid 209002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor // and are equivalent to the template arguments originally provided 20911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // to the class template. 20922a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(S); 209302cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor ClassTemplateDecl *ClassTemplate = Partial->getSpecializedTemplate(); 2094833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall const TemplateArgumentLoc *PartialTemplateArgs 2095833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall = Partial->getTemplateArgsAsWritten(); 2096d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall 2097d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall // Note that we don't provide the langle and rangle locations. 2098d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall TemplateArgumentListInfo InstArgs; 2099d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall 2100e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (S.Subst(PartialTemplateArgs, 2101e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Partial->getNumTemplateArgsAsWritten(), 2102e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor InstArgs, MultiLevelTemplateArgumentList(*DeducedArgumentList))) { 2103e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor unsigned ArgIdx = InstArgs.size(), ParamIdx = ArgIdx; 2104e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor if (ParamIdx >= Partial->getTemplateParameters()->size()) 2105e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor ParamIdx = Partial->getTemplateParameters()->size() - 1; 2106e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor 2107e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Decl *Param 2108e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor = const_cast<NamedDecl *>( 2109e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Partial->getTemplateParameters()->getParam(ParamIdx)); 2110e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2111e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor Info.FirstArg = PartialTemplateArgs[ArgIdx].getArgument(); 2112e02e26293cf8e3bad1059b39cea75c6582896da6Douglas Gregor return Sema::TDK_SubstitutionFailure; 2113833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall } 2114833ca991c1bfc967f0995974ca86f66ba1f666b5John McCall 21155f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> ConvertedInstArgs; 211631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (S.CheckTemplateArgumentList(ClassTemplate, Partial->getLocation(), 211754c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor InstArgs, false, ConvertedInstArgs)) 211831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2119dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 212054c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor TemplateParameterList *TemplateParams 212154c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor = ClassTemplate->getTemplateParameters(); 212254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor for (unsigned I = 0, E = TemplateParams->size(); I != E; ++I) { 2123910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor TemplateArgument InstArg = ConvertedInstArgs.data()[I]; 212431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (!isSameTemplateArg(S.Context, TemplateArgs[I], InstArg)) { 21252fdc5e8199e1e239620f2faae88997153703e16fDouglas Gregor Info.Param = makeTemplateParameter(TemplateParams->getParam(I)); 2126f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Info.FirstArg = TemplateArgs[I]; 2127f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor Info.SecondArg = InstArg; 212831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_NonDeducedMismatch; 2129f670c8cfa58b4c224eb8fb566130dc47844dd3deDouglas Gregor } 213002cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor } 213102cbbd2d945e466174bee536758e5a2e6a1c0ea2Douglas Gregor 2132bb2604122f4186b6f666481f699b27c7e7a95790Douglas Gregor if (Trap.hasErrorOccurred()) 213331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2134bb2604122f4186b6f666481f699b27c7e7a95790Douglas Gregor 213531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_Success; 213631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor} 213731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 213831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// \brief Perform template argument deduction to determine whether 213931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// the given template arguments match the given class template 214031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor/// partial specialization per C++ [temp.class.spec.match]. 214131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas GregorSema::TemplateDeductionResult 214231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas GregorSema::DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial, 214331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor const TemplateArgumentList &TemplateArgs, 214431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor TemplateDeductionInfo &Info) { 214531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // C++ [temp.class.spec.match]p2: 214631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // A partial specialization matches a given actual template 214731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // argument list if the template arguments of the partial 214831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // specialization can be deduced from the actual template argument 214931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // list (14.8.2). 215031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor SFINAETrap Trap(*this); 21515f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 215231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Deduced.resize(Partial->getTemplateParameters()->size()); 215331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (TemplateDeductionResult Result 215431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor = ::DeduceTemplateArguments(*this, 215531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Partial->getTemplateParameters(), 215631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Partial->getTemplateArgs(), 215731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor TemplateArgs, Info, Deduced)) 215831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Result; 215931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 216031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor InstantiatingTemplate Inst(*this, Partial->getLocation(), Partial, 21619b623639378d53a675921ddfa7316034d571881eDouglas Gregor Deduced.data(), Deduced.size(), Info); 216231dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (Inst) 216331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return TDK_InstantiationDepth; 216431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor 216531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor if (Trap.hasErrorOccurred()) 216631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor return Sema::TDK_SubstitutionFailure; 2167dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2168dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return ::FinishTemplateArgumentDeduction(*this, Partial, TemplateArgs, 216931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor Deduced, Info); 21700b9247f129401b4849682b2e2bcdea8fc977068aDouglas Gregor} 2171031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 21724112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor/// \brief Determine whether the given type T is a simple-template-id type. 21734112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregorstatic bool isSimpleTemplateIdType(QualType T) { 21741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (const TemplateSpecializationType *Spec 2175183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = T->getAs<TemplateSpecializationType>()) 21764112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor return Spec->getTemplateName().getAsTemplateDecl() != 0; 21771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 21784112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor return false; 21794112877d1043d0b937f5abcf043bc7fa48138f05Douglas Gregor} 218083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 218183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \brief Substitute the explicitly-provided template arguments into the 218283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// given function template according to C++ [temp.arg.explicit]. 218383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 218483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionTemplate the function template into which the explicit 218583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template arguments will be substituted. 218683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 21871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param ExplicitTemplateArguments the explicitly-specified template 218883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// arguments. 218983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 21901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param Deduced the deduced template arguments, which will be populated 219183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// with the converted and checked explicit template arguments. 219283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 21931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \param ParamTypes will be populated with the instantiated function 219483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// parameters. 219583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 219683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionType if non-NULL, the result type of the function template 219783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// will also be instantiated and the pointed-to value will be updated with 219883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// the instantiated function type. 219983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 220083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Info if substitution fails for any reason, this object will be 220183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// populated with more information about the failure. 220283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 220383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \returns TDK_Success if substitution was successful, or some failure 220483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// condition. 220583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::TemplateDeductionResult 220683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::SubstituteExplicitTemplateArguments( 220783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionTemplateDecl *FunctionTemplate, 220867714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo &ExplicitTemplateArgs, 22095f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 22105f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<QualType> &ParamTypes, 221183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType *FunctionType, 221283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionInfo &Info) { 221383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 221483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 221583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 221683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 2217d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs.size() == 0) { 221883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // No arguments to substitute; just copy over the parameter types and 221983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // fill in the function type. 222083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor for (FunctionDecl::param_iterator P = Function->param_begin(), 222183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor PEnd = Function->param_end(); 222283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor P != PEnd; 222383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ++P) 222483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes.push_back((*P)->getType()); 22251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 222683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType) 222783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor *FunctionType = Function->getType(); 222883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Success; 222983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 22301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 223183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Substitution of the explicit template arguments into a function template 223283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor /// is a SFINAE context. Trap any errors that might occur. 22331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 22341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 223583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.arg.explicit]p3: 22361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Template arguments that are present shall be specified in the 22371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // declaration order of their corresponding template-parameters. The 223883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template argument list shall not specify more template-arguments than 22391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // there are corresponding template-parameters. 22405f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> Builder; 22411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 22421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Enter a new template instantiation context where we check the 224383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly-specified template arguments against this function template, 224483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // and then substitute them into the function parameter types. 22451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), 224683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionTemplate, Deduced.data(), Deduced.size(), 22479b623639378d53a675921ddfa7316034d571881eDouglas Gregor ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution, 22489b623639378d53a675921ddfa7316034d571881eDouglas Gregor Info); 224983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (Inst) 225083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_InstantiationDepth; 22511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 225283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (CheckTemplateArgumentList(FunctionTemplate, 225383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor SourceLocation(), 2254d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall ExplicitTemplateArgs, 225583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor true, 2256f1a8445036a2d047c7165d4170e3058cdeaba6ebDouglas Gregor Builder) || Trap.hasErrorOccurred()) { 2257910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor unsigned Index = Builder.size(); 2258fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor if (Index >= TemplateParams->size()) 2259fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor Index = TemplateParams->size() - 1; 2260fe52c91dcd1ecda90b579f789baf70f7a992e3c9Douglas Gregor Info.Param = makeTemplateParameter(TemplateParams->getParam(Index)); 226183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_InvalidExplicitArguments; 2262f1a8445036a2d047c7165d4170e3058cdeaba6ebDouglas Gregor } 22631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 226483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Form the template argument list from the explicitly-specified 226583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template arguments. 22661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *ExplicitArgumentList 2267910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); 226883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.reset(ExplicitArgumentList); 2269dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2270df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // Template argument deduction and the final substitution should be 2271df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // done in the context of the templated declaration. Explicit 2272df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // argument substitution, on the other hand, needs to happen in the 2273df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall // calling context. 2274df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); 2275df41f18936693f7c62e457eefb9fad5b2d2fe3cdJohn McCall 2276dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If we deduced template arguments for a template parameter pack, 2277d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // note that the template argument pack is partially substituted and record 2278d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // the explicit template arguments. They'll be used as part of deduction 2279d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // for this template parameter pack. 2280d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor for (unsigned I = 0, N = Builder.size(); I != N; ++I) { 2281d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument &Arg = Builder[I]; 2282d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (Arg.getKind() == TemplateArgument::Pack) { 2283d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor CurrentInstantiationScope->SetPartiallySubstitutedPack( 2284dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateParams->getParam(I), 2285d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Arg.pack_begin(), 2286d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Arg.pack_size()); 2287d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor break; 2288d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 2289d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 2290d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor 229183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Instantiate the types of each of the function parameters given the 229283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly-specified template arguments. 2293dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (SubstParmTypes(Function->getLocation(), 2294a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor Function->param_begin(), Function->getNumParams(), 2295a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor MultiLevelTemplateArgumentList(*ExplicitArgumentList), 2296a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor ParamTypes)) 2297a009b59fc2c550a229b9146aabda8e33fe3a7771Douglas Gregor return TDK_SubstitutionFailure; 229883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 229983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // If the caller wants a full function type back, instantiate the return 230083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // type and form that function type. 230183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType) { 230283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // FIXME: exception-specifications? 23031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *Proto 2304183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Function->getType()->getAs<FunctionProtoType>(); 230583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor assert(Proto && "Function template does not have a prototype?"); 23061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 23071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump QualType ResultType 2308357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor = SubstType(Proto->getResultType(), 2309357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor MultiLevelTemplateArgumentList(*ExplicitArgumentList), 2310357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor Function->getTypeSpecStartLoc(), 2311357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor Function->getDeclName()); 231283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (ResultType.isNull() || Trap.hasErrorOccurred()) 231383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 23141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 23151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump *FunctionType = BuildFunctionType(ResultType, 231683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes.data(), ParamTypes.size(), 231783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Proto->isVariadic(), 231883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Proto->getTypeQuals(), 2319c938c1668b4fd12af154e965dd935a89e4801a70Douglas Gregor Proto->getRefQualifier(), 232083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Function->getLocation(), 2321fa869547eb1cab12d7e0c0dfa8ba594e336b9b32Eli Friedman Function->getDeclName(), 2322fa869547eb1cab12d7e0c0dfa8ba594e336b9b32Eli Friedman Proto->getExtInfo()); 232383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (FunctionType->isNull() || Trap.hasErrorOccurred()) 232483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 232583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 23261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 232783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.arg.explicit]p2: 23281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Trailing template arguments that can be deduced (14.8.2) may be 23291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // omitted from the list of explicit template-arguments. If all of the 233083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // template arguments can be deduced, they may all be omitted; in this 233183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // case, the empty template argument list <> itself may also be omitted. 233283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // 2333d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Take all of the explicitly-specified arguments and put them into 2334d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // the set of deduced template arguments. Explicitly-specified 2335d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // parameter packs, however, will be set to NULL since the deduction 2336d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // mechanisms handle explicitly-specified argument packs directly. 233783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Deduced.reserve(TemplateParams->size()); 2338d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor for (unsigned I = 0, N = ExplicitArgumentList->size(); I != N; ++I) { 2339d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument &Arg = ExplicitArgumentList->get(I); 2340d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (Arg.getKind() == TemplateArgument::Pack) 2341d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Deduced.push_back(DeducedTemplateArgument()); 2342d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor else 2343d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Deduced.push_back(Arg); 2344d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor } 23451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 234683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Success; 234783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 234883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 2349b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor/// \brief Check whether the deduced argument type for a call to a function 2350b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor/// template matches the actual argument type per C++ [temp.deduct.call]p4. 2351b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregorstatic bool 2352b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas GregorCheckOriginalCallArgDeduction(Sema &S, Sema::OriginalCallArg OriginalArg, 2353b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor QualType DeducedA) { 2354b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor ASTContext &Context = S.Context; 2355b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2356b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor QualType A = OriginalArg.OriginalArgType; 2357b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor QualType OriginalParamType = OriginalArg.OriginalParamType; 2358b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2359b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Check for type equality (top-level cv-qualifiers are ignored). 2360b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (Context.hasSameUnqualifiedType(A, DeducedA)) 2361b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2362b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2363b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Strip off references on the argument types; they aren't needed for 2364b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // the following checks. 2365b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const ReferenceType *DeducedARef = DeducedA->getAs<ReferenceType>()) 2366b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor DeducedA = DeducedARef->getPointeeType(); 2367b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const ReferenceType *ARef = A->getAs<ReferenceType>()) 2368b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor A = ARef->getPointeeType(); 2369b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2370b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // C++ [temp.deduct.call]p4: 2371b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // [...] However, there are three cases that allow a difference: 2372b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // - If the original P is a reference type, the deduced A (i.e., the 2373b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // type referred to by the reference) can be more cv-qualified than 2374b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // the transformed A. 2375b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const ReferenceType *OriginalParamRef 2376b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor = OriginalParamType->getAs<ReferenceType>()) { 2377b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // We don't want to keep the reference around any more. 2378b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor OriginalParamType = OriginalParamRef->getPointeeType(); 2379b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2380b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor Qualifiers AQuals = A.getQualifiers(); 2381b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor Qualifiers DeducedAQuals = DeducedA.getQualifiers(); 2382b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (AQuals == DeducedAQuals) { 2383b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Qualifiers match; there's nothing to do. 2384b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } else if (!DeducedAQuals.compatiblyIncludes(AQuals)) { 2385c99f0ec89fd9782cfafd14d7b1b0a80151eab24aDouglas Gregor return true; 2386b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } else { 2387b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // Qualifiers are compatible, so have the argument type adopt the 2388b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // deduced argument type's qualifiers as if we had performed the 2389b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // qualification conversion. 2390b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor A = Context.getQualifiedType(A.getUnqualifiedType(), DeducedAQuals); 2391b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2392b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2393b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2394b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // - The transformed A can be another pointer or pointer to member 2395b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // type that can be converted to the deduced A via a qualification 2396b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // conversion. 239718e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // 239818e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // Also allow conversions which merely strip [[noreturn]] from function types 239918e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // (recursively) as an extension. 240018e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth // FIXME: Currently, this doesn't place nicely with qualfication conversions. 2401b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor bool ObjCLifetimeConversion = false; 240218e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth QualType ResultTy; 2403b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if ((A->isAnyPointerType() || A->isMemberPointerType()) && 240418e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth (S.IsQualificationConversion(A, DeducedA, false, 240518e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth ObjCLifetimeConversion) || 240618e0461ad72dcf6ec93cd3b1df7bf1b5a30b10b7Chandler Carruth S.IsNoReturnConversion(A, DeducedA, ResultTy))) 2407b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2408b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2409b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2410b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // - If P is a class and P has the form simple-template-id, then the 2411b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // transformed A can be a derived class of the deduced A. [...] 2412b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // [...] Likewise, if P is a pointer to a class of the form 2413b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // simple-template-id, the transformed A can be a pointer to a 2414b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor // derived class pointed to by the deduced A. 2415b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const PointerType *OriginalParamPtr 2416b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor = OriginalParamType->getAs<PointerType>()) { 2417b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const PointerType *DeducedAPtr = DeducedA->getAs<PointerType>()) { 2418b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (const PointerType *APtr = A->getAs<PointerType>()) { 2419b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (A->getPointeeType()->isRecordType()) { 2420b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor OriginalParamType = OriginalParamPtr->getPointeeType(); 2421b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor DeducedA = DeducedAPtr->getPointeeType(); 2422b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor A = APtr->getPointeeType(); 2423b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2424b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2425b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2426b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor } 2427b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2428b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (Context.hasSameUnqualifiedType(A, DeducedA)) 2429b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2430b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2431b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (A->isRecordType() && isSimpleTemplateIdType(OriginalParamType) && 2432b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor S.IsDerivedFrom(A, DeducedA)) 2433b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return false; 2434b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 2435b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return true; 2436b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor} 2437b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor 24381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// \brief Finish template argument deduction for a function template, 243983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// checking the deduced template arguments for completeness and forming 244083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// the function template specialization. 2441dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor/// 2442dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor/// \param OriginalCallArgs If non-NULL, the original call arguments against 2443dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor/// which the deduced argument types should be compared. 24441eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpSema::TemplateDeductionResult 244583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::FinishTemplateArgumentDeduction(FunctionTemplateDecl *FunctionTemplate, 24465f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<DeducedTemplateArgument> &Deduced, 244702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified, 244883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *&Specialization, 2449dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor TemplateDeductionInfo &Info, 24505f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<OriginalCallArg> const *OriginalCallArgs) { 245183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 245283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 24531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 245451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Template argument deduction for function templates in a SFINAE context. 245551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Trap any errors that might occur. 245651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor SFINAETrap Trap(*this); 245751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 245851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Enter a new template instantiation context while we instantiate the 245951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // actual function declaration. 246051ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), 246151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate, Deduced.data(), Deduced.size(), 24629b623639378d53a675921ddfa7316034d571881eDouglas Gregor ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution, 24639b623639378d53a675921ddfa7316034d571881eDouglas Gregor Info); 246451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (Inst) 246551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor return TDK_InstantiationDepth; 246651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 246796db310ab7ca59e1890ddef25a3701bc2909d20fJohn McCall ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); 2468f5813826802c2e76cdc13cae834ebfd4518d74a6John McCall 246983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // C++ [temp.deduct.type]p2: 247083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // [...] or if any template argument remains neither deduced nor 247183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // explicitly specified, template argument deduction fails. 24725f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<TemplateArgument, 4> Builder; 2473b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { 2474b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NamedDecl *Param = TemplateParams->getParam(I); 2475dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 247651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (!Deduced[I].isNull()) { 24773273b0cea879c7af345d6bf98502bbf73fc4fde1Douglas Gregor if (I < NumExplicitlySpecified) { 247802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // We have already fully type-checked and converted this 2479dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // argument, because it was explicitly-specified. Just record the 24803273b0cea879c7af345d6bf98502bbf73fc4fde1Douglas Gregor // presence of this argument. 2481910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.push_back(Deduced[I]); 248202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor continue; 248302024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 248402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 248502024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // We have deduced this argument, so it still needs to be 248602024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // checked and converted. 248702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 248802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // First, for a non-type template parameter type that is 248902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // initialized by a declaration, we need the type of the 249002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor // corresponding non-type template parameter. 249102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor QualType NTTPType; 2492dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (NonTypeTemplateParmDecl *NTTP 2493dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = dyn_cast<NonTypeTemplateParmDecl>(Param)) { 2494b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTPType = NTTP->getType(); 2495b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (NTTPType->isDependentType()) { 2496dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, 2497b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Builder.data(), Builder.size()); 2498b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTPType = SubstType(NTTPType, 2499b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor MultiLevelTemplateArgumentList(TemplateArgs), 2500b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTP->getLocation(), 2501b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor NTTP->getDeclName()); 2502b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (NTTPType.isNull()) { 2503b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2504b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2505dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, 2506dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.data(), 2507b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Builder.size())); 2508b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor return TDK_SubstitutionFailure; 250902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 251002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 251102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 251202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 2513b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor if (ConvertDeducedTemplateArgument(*this, Param, Deduced[I], 25146952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor FunctionTemplate, NTTPType, 0, Info, 251554c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor true, Builder)) { 2516b9a7d6fb53f2b76df2ef832146a1edb4cb01b9f6Douglas Gregor Info.Param = makeTemplateParameter(Param); 2517910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2518dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), 2519dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Builder.size())); 252002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor return TDK_SubstitutionFailure; 252102024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor } 252202024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 252351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor continue; 252451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor } 2525dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2526ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // C++0x [temp.arg.explicit]p3: 2527dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // A trailing template parameter pack (14.5.3) not otherwise deduced will 2528ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // be deduced to an empty sequence of template arguments. 2529ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor // FIXME: Where did the word "trailing" come from? 2530ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor if (Param->isTemplateParameterPack()) { 2531d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // We may have had explicitly-specified template arguments for this 2532d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template parameter pack. If so, our empty deduction extends the 2533d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // explicitly-specified set (C++0x [temp.arg.explicit]p9). 2534d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor const TemplateArgument *ExplicitArgs; 2535d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor unsigned NumExplicitArgs; 2536d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor if (CurrentInstantiationScope->getPartiallySubstitutedPack(&ExplicitArgs, 2537d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor &NumExplicitArgs) 2538d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor == Param) 2539d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Builder.push_back(TemplateArgument(ExplicitArgs, NumExplicitArgs)); 2540dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi else 2541d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor Builder.push_back(TemplateArgument(0, 0)); 2542dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2543ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor continue; 2544ea6c96f63a45b4ffdcdf9824a9cf31a32825c0f6Douglas Gregor } 254551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 2546dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // Substitute into the default template argument, if available. 254751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor TemplateArgumentLoc DefArg 254851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor = SubstDefaultTemplateArgumentIfAvailable(FunctionTemplate, 254951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getLocation(), 255051ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getSourceRange().getEnd(), 255151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Param, 255251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Builder); 255351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor 255451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // If there was no default argument, deduction is incomplete. 255551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (DefArg.getArgument().isNull()) { 255683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.Param = makeTemplateParameter( 255751ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor const_cast<NamedDecl *>(TemplateParams->getParam(I))); 255883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_Incomplete; 255983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 2560dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 256151ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // Check whether we can actually use the default argument. 256251ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor if (CheckTemplateArgument(Param, DefArg, 256351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate, 256451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getLocation(), 256551ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor FunctionTemplate->getSourceRange().getEnd(), 25666952f1e4256c5b43aee5e98cea4e9b663bd1d413Douglas Gregor 0, Builder, 25678735b294a257a07ca158c28094d7324f0adf889aDouglas Gregor CTAK_Specified)) { 256851ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor Info.Param = makeTemplateParameter( 256951ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor const_cast<NamedDecl *>(TemplateParams->getParam(I))); 2570910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor // FIXME: These template arguments are temporary. Free them! 2571dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), 2572910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor Builder.size())); 257351ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor return TDK_SubstitutionFailure; 257451ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor } 25751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 257651ffb0c9d43b2d3fd210e51ecdd67ba5d1790d70Douglas Gregor // If we get here, we successfully used the default template argument. 257783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor } 25781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 257983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Form the template argument list from the deduced template arguments. 25801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump TemplateArgumentList *DeducedArgumentList 2581910f8008fea79120489a53593fe971b0b8a4a740Douglas Gregor = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); 258283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.reset(DeducedArgumentList); 25831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 25841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Substitute the deduced template arguments into the function template 258583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // declaration to produce the function template specialization. 2586d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor DeclContext *Owner = FunctionTemplate->getDeclContext(); 2587d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor if (FunctionTemplate->getFriendObjectKind()) 2588d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor Owner = FunctionTemplate->getLexicalDeclContext(); 258983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Specialization = cast_or_null<FunctionDecl>( 2590d4598a2cc7576c06f69d3cf64d0e2c9783ddf529Douglas Gregor SubstDecl(FunctionTemplate->getTemplatedDecl(), Owner, 2591357bbd022c1d340c8e255aea7a684ddb34bc76e5Douglas Gregor MultiLevelTemplateArgumentList(*DeducedArgumentList))); 25925fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor if (!Specialization || Specialization->isInvalidDecl()) 259383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return TDK_SubstitutionFailure; 25941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2595dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi assert(Specialization->getPrimaryTemplate()->getCanonicalDecl() == 2596f882574cf640d5c8355965e1c486f9d8d8ffcf47Douglas Gregor FunctionTemplate->getCanonicalDecl()); 2597dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 25981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If the template argument list is owned by the function template 259983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // specialization, release it. 2600ec20f46740a59758b12c22108002395bcf5b6f9bDouglas Gregor if (Specialization->getTemplateSpecializationArgs() == DeducedArgumentList && 2601ec20f46740a59758b12c22108002395bcf5b6f9bDouglas Gregor !Trap.hasErrorOccurred()) 260283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info.take(); 26031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 26045fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor // There may have been an error that did not prevent us from constructing a 26055fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor // declaration. Mark the declaration invalid and return with a substitution 26065fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor // failure. 26075fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor if (Trap.hasErrorOccurred()) { 26085fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor Specialization->setInvalidDecl(true); 26095fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor return TDK_SubstitutionFailure; 26105fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor } 26115fad9b8362c62e230f6603d86ec7d1747e74c737Douglas Gregor 2612dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (OriginalCallArgs) { 2613dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // C++ [temp.deduct.call]p4: 2614dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // In general, the deduction process attempts to find template argument 2615dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // values that will make the deduced A identical to A (after the type A 2616dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // is transformed as described above). [...] 2617dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor for (unsigned I = 0, N = OriginalCallArgs->size(); I != N; ++I) { 2618dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor OriginalCallArg OriginalArg = (*OriginalCallArgs)[I]; 2619dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor unsigned ParamIdx = OriginalArg.ArgIdx; 2620dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2621dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (ParamIdx >= Specialization->getNumParams()) 2622dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor continue; 2623dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2624dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType DeducedA = Specialization->getParamDecl(ParamIdx)->getType(); 2625b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor if (CheckOriginalCallArgDeduction(*this, OriginalArg, DeducedA)) 2626b7edc4f372f1abe6c422ea711a99f9906a7464daDouglas Gregor return Sema::TDK_SubstitutionFailure; 2627dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor } 2628dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor } 2629dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 26309b623639378d53a675921ddfa7316034d571881eDouglas Gregor // If we suppressed any diagnostics while performing template argument 26319b623639378d53a675921ddfa7316034d571881eDouglas Gregor // deduction, and if we haven't already instantiated this declaration, 26329b623639378d53a675921ddfa7316034d571881eDouglas Gregor // keep track of these diagnostics. They'll be emitted if this specialization 26339b623639378d53a675921ddfa7316034d571881eDouglas Gregor // is actually used. 26349b623639378d53a675921ddfa7316034d571881eDouglas Gregor if (Info.diag_begin() != Info.diag_end()) { 26355f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >::iterator 26369b623639378d53a675921ddfa7316034d571881eDouglas Gregor Pos = SuppressedDiagnostics.find(Specialization->getCanonicalDecl()); 26379b623639378d53a675921ddfa7316034d571881eDouglas Gregor if (Pos == SuppressedDiagnostics.end()) 26389b623639378d53a675921ddfa7316034d571881eDouglas Gregor SuppressedDiagnostics[Specialization->getCanonicalDecl()] 26399b623639378d53a675921ddfa7316034d571881eDouglas Gregor .append(Info.diag_begin(), Info.diag_end()); 2640dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi } 26419b623639378d53a675921ddfa7316034d571881eDouglas Gregor 26421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return TDK_Success; 264383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 264483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 26459c72c6088d591ace8503b842d39448c2040f3033John McCall/// Gets the type of a function for template-argument-deducton 26469c72c6088d591ace8503b842d39448c2040f3033John McCall/// purposes when it's considered as part of an overload set. 2647eff92135d32039c9874dc356f3e93143af6069c1John McCallstatic QualType GetTypeOfFunction(ASTContext &Context, 26489c72c6088d591ace8503b842d39448c2040f3033John McCall const OverloadExpr::FindResult &R, 2649eff92135d32039c9874dc356f3e93143af6069c1John McCall FunctionDecl *Fn) { 2650eff92135d32039c9874dc356f3e93143af6069c1John McCall if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) 26519c72c6088d591ace8503b842d39448c2040f3033John McCall if (Method->isInstance()) { 26529c72c6088d591ace8503b842d39448c2040f3033John McCall // An instance method that's referenced in a form that doesn't 26539c72c6088d591ace8503b842d39448c2040f3033John McCall // look like a member pointer is just invalid. 26549c72c6088d591ace8503b842d39448c2040f3033John McCall if (!R.HasFormOfMemberPointer) return QualType(); 26559c72c6088d591ace8503b842d39448c2040f3033John McCall 2656eff92135d32039c9874dc356f3e93143af6069c1John McCall return Context.getMemberPointerType(Fn->getType(), 2657eff92135d32039c9874dc356f3e93143af6069c1John McCall Context.getTypeDeclType(Method->getParent()).getTypePtr()); 26589c72c6088d591ace8503b842d39448c2040f3033John McCall } 26599c72c6088d591ace8503b842d39448c2040f3033John McCall 26609c72c6088d591ace8503b842d39448c2040f3033John McCall if (!R.IsAddressOfOperand) return Fn->getType(); 2661eff92135d32039c9874dc356f3e93143af6069c1John McCall return Context.getPointerType(Fn->getType()); 2662eff92135d32039c9874dc356f3e93143af6069c1John McCall} 2663eff92135d32039c9874dc356f3e93143af6069c1John McCall 2664eff92135d32039c9874dc356f3e93143af6069c1John McCall/// Apply the deduction rules for overload sets. 2665eff92135d32039c9874dc356f3e93143af6069c1John McCall/// 2666eff92135d32039c9874dc356f3e93143af6069c1John McCall/// \return the null type if this argument should be treated as an 2667eff92135d32039c9874dc356f3e93143af6069c1John McCall/// undeduced context 2668eff92135d32039c9874dc356f3e93143af6069c1John McCallstatic QualType 2669eff92135d32039c9874dc356f3e93143af6069c1John McCallResolveOverloadForDeduction(Sema &S, TemplateParameterList *TemplateParams, 267075f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor Expr *Arg, QualType ParamType, 267175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor bool ParamWasReference) { 2672dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 26739c72c6088d591ace8503b842d39448c2040f3033John McCall OverloadExpr::FindResult R = OverloadExpr::find(Arg); 2674eff92135d32039c9874dc356f3e93143af6069c1John McCall 26759c72c6088d591ace8503b842d39448c2040f3033John McCall OverloadExpr *Ovl = R.Expression; 2676eff92135d32039c9874dc356f3e93143af6069c1John McCall 267775f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor // C++0x [temp.deduct.call]p4 267875f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor unsigned TDF = 0; 267975f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor if (ParamWasReference) 268075f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor TDF |= TDF_ParamWithReferenceType; 268175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor if (R.IsAddressOfOperand) 268275f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor TDF |= TDF_IgnoreQualifiers; 268375f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor 2684eff92135d32039c9874dc356f3e93143af6069c1John McCall // If there were explicit template arguments, we can only find 2685eff92135d32039c9874dc356f3e93143af6069c1John McCall // something via C++ [temp.arg.explicit]p3, i.e. if the arguments 2686eff92135d32039c9874dc356f3e93143af6069c1John McCall // unambiguously name a full specialization. 26877bb12da2b0749eeebb21854c77877736969e59f2John McCall if (Ovl->hasExplicitTemplateArgs()) { 2688eff92135d32039c9874dc356f3e93143af6069c1John McCall // But we can still look for an explicit specialization. 2689eff92135d32039c9874dc356f3e93143af6069c1John McCall if (FunctionDecl *ExplicitSpec 26907bb12da2b0749eeebb21854c77877736969e59f2John McCall = S.ResolveSingleFunctionTemplateSpecialization(Ovl)) 26919c72c6088d591ace8503b842d39448c2040f3033John McCall return GetTypeOfFunction(S.Context, R, ExplicitSpec); 2692eff92135d32039c9874dc356f3e93143af6069c1John McCall return QualType(); 2693eff92135d32039c9874dc356f3e93143af6069c1John McCall } 2694eff92135d32039c9874dc356f3e93143af6069c1John McCall 2695eff92135d32039c9874dc356f3e93143af6069c1John McCall // C++0x [temp.deduct.call]p6: 2696eff92135d32039c9874dc356f3e93143af6069c1John McCall // When P is a function type, pointer to function type, or pointer 2697eff92135d32039c9874dc356f3e93143af6069c1John McCall // to member function type: 2698eff92135d32039c9874dc356f3e93143af6069c1John McCall 2699eff92135d32039c9874dc356f3e93143af6069c1John McCall if (!ParamType->isFunctionType() && 2700eff92135d32039c9874dc356f3e93143af6069c1John McCall !ParamType->isFunctionPointerType() && 2701eff92135d32039c9874dc356f3e93143af6069c1John McCall !ParamType->isMemberFunctionPointerType()) 2702eff92135d32039c9874dc356f3e93143af6069c1John McCall return QualType(); 2703eff92135d32039c9874dc356f3e93143af6069c1John McCall 2704eff92135d32039c9874dc356f3e93143af6069c1John McCall QualType Match; 27057bb12da2b0749eeebb21854c77877736969e59f2John McCall for (UnresolvedSetIterator I = Ovl->decls_begin(), 27067bb12da2b0749eeebb21854c77877736969e59f2John McCall E = Ovl->decls_end(); I != E; ++I) { 2707eff92135d32039c9874dc356f3e93143af6069c1John McCall NamedDecl *D = (*I)->getUnderlyingDecl(); 2708eff92135d32039c9874dc356f3e93143af6069c1John McCall 2709eff92135d32039c9874dc356f3e93143af6069c1John McCall // - If the argument is an overload set containing one or more 2710eff92135d32039c9874dc356f3e93143af6069c1John McCall // function templates, the parameter is treated as a 2711eff92135d32039c9874dc356f3e93143af6069c1John McCall // non-deduced context. 2712eff92135d32039c9874dc356f3e93143af6069c1John McCall if (isa<FunctionTemplateDecl>(D)) 2713eff92135d32039c9874dc356f3e93143af6069c1John McCall return QualType(); 2714eff92135d32039c9874dc356f3e93143af6069c1John McCall 2715eff92135d32039c9874dc356f3e93143af6069c1John McCall FunctionDecl *Fn = cast<FunctionDecl>(D); 27169c72c6088d591ace8503b842d39448c2040f3033John McCall QualType ArgType = GetTypeOfFunction(S.Context, R, Fn); 27179c72c6088d591ace8503b842d39448c2040f3033John McCall if (ArgType.isNull()) continue; 2718eff92135d32039c9874dc356f3e93143af6069c1John McCall 271975f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor // Function-to-pointer conversion. 2720dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (!ParamWasReference && ParamType->isPointerType() && 272175f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor ArgType->isFunctionType()) 272275f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor ArgType = S.Context.getPointerType(ArgType); 2723dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2724eff92135d32039c9874dc356f3e93143af6069c1John McCall // - If the argument is an overload set (not containing function 2725eff92135d32039c9874dc356f3e93143af6069c1John McCall // templates), trial argument deduction is attempted using each 2726eff92135d32039c9874dc356f3e93143af6069c1John McCall // of the members of the set. If deduction succeeds for only one 2727eff92135d32039c9874dc356f3e93143af6069c1John McCall // of the overload set members, that member is used as the 2728eff92135d32039c9874dc356f3e93143af6069c1John McCall // argument value for the deduction. If deduction succeeds for 2729eff92135d32039c9874dc356f3e93143af6069c1John McCall // more than one member of the overload set the parameter is 2730eff92135d32039c9874dc356f3e93143af6069c1John McCall // treated as a non-deduced context. 2731eff92135d32039c9874dc356f3e93143af6069c1John McCall 2732eff92135d32039c9874dc356f3e93143af6069c1John McCall // We do all of this in a fresh context per C++0x [temp.deduct.type]p2: 2733eff92135d32039c9874dc356f3e93143af6069c1John McCall // Type deduction is done independently for each P/A pair, and 2734eff92135d32039c9874dc356f3e93143af6069c1John McCall // the deduced template argument values are then combined. 2735eff92135d32039c9874dc356f3e93143af6069c1John McCall // So we do not reject deductions which were made elsewhere. 27365f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 8> 273702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor Deduced(TemplateParams->size()); 27382a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(S.Context, Ovl->getNameLoc()); 2739eff92135d32039c9874dc356f3e93143af6069c1John McCall Sema::TemplateDeductionResult Result 2740a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = DeduceTemplateArguments(S, TemplateParams, 2741eff92135d32039c9874dc356f3e93143af6069c1John McCall ParamType, ArgType, 2742eff92135d32039c9874dc356f3e93143af6069c1John McCall Info, Deduced, TDF); 2743eff92135d32039c9874dc356f3e93143af6069c1John McCall if (Result) continue; 2744eff92135d32039c9874dc356f3e93143af6069c1John McCall if (!Match.isNull()) return QualType(); 2745eff92135d32039c9874dc356f3e93143af6069c1John McCall Match = ArgType; 2746eff92135d32039c9874dc356f3e93143af6069c1John McCall } 2747eff92135d32039c9874dc356f3e93143af6069c1John McCall 2748eff92135d32039c9874dc356f3e93143af6069c1John McCall return Match; 2749eff92135d32039c9874dc356f3e93143af6069c1John McCall} 2750eff92135d32039c9874dc356f3e93143af6069c1John McCall 2751dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief Perform the adjustments to the parameter and argument types 2752f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// described in C++ [temp.deduct.call]. 2753f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// 2754f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// \returns true if the caller should not attempt to perform any template 2755f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor/// argument deduction based on this P/A pair. 2756f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregorstatic bool AdjustFunctionParmAndArgTypesForDeduction(Sema &S, 2757f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TemplateParameterList *TemplateParams, 2758f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType &ParamType, 2759f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType &ArgType, 2760f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg, 2761f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned &TDF) { 2762f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p3: 27630099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // If P is a cv-qualified type, the top level cv-qualifiers of P's type 2764f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // are ignored for type deduction. 2765a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor if (ParamType.hasQualifiers()) 2766a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor ParamType = ParamType.getUnqualifiedType(); 2767f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>(); 2768f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) { 276934b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType PointeeType = ParamRefType->getPointeeType(); 277034b41d939a1328f484511c6002ba2456db879a29Richard Smith 2771f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor // If the argument has incomplete array type, try to complete it's type. 2772f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor if (ArgType->isIncompleteArrayType() && 2773f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor !S.RequireCompleteExprType(Arg, S.PDiag(), 2774f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor std::make_pair(SourceLocation(), S.PDiag()))) 2775f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor ArgType = Arg->getType(); 2776f15748a28c8443eef2924ef83689c358c661e9c5Douglas Gregor 27772ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // [C++0x] If P is an rvalue reference to a cv-unqualified 27782ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // template parameter and the argument is an lvalue, the type 27792ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // "lvalue reference to A" is used in place of A for type 27802ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor // deduction. 278134b41d939a1328f484511c6002ba2456db879a29Richard Smith if (isa<RValueReferenceType>(ParamType)) { 278234b41d939a1328f484511c6002ba2456db879a29Richard Smith if (!PointeeType.getQualifiers() && 278334b41d939a1328f484511c6002ba2456db879a29Richard Smith isa<TemplateTypeParmType>(PointeeType) && 27849625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->Classify(S.Context).isLValue() && 27859625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->getType() != S.Context.OverloadTy && 27869625e44c0252485277a340746ed8ac950686156fDouglas Gregor Arg->getType() != S.Context.BoundMemberTy) 27872ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor ArgType = S.Context.getLValueReferenceType(ArgType); 27882ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor } 27892ad746aeb90e86cea7afaf552a02ae3f3b5ec859Douglas Gregor 2790f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // [...] If P is a reference type, the type referred to by P is used 2791f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // for type deduction. 279234b41d939a1328f484511c6002ba2456db879a29Richard Smith ParamType = PointeeType; 2793f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2794dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2795f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Overload sets usually make this parameter an undeduced 2796f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // context, but there are sometimes special circumstances. 2797f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType == S.Context.OverloadTy) { 2798f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = ResolveOverloadForDeduction(S, TemplateParams, 2799f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Arg, ParamType, 2800f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamRefType != 0); 2801f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType.isNull()) 2802f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return true; 2803f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2804dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2805f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) { 2806f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p3: 2807f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // [...] If P is of the form T&&, where T is a template parameter, and 2808f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the argument is an lvalue, the type A& is used in place of A for 2809f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type deduction. 2810f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType->isRValueReferenceType() && 2811f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamRefType->getAs<TemplateTypeParmType>() && 2812f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Arg->isLValue()) 2813f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getLValueReferenceType(ArgType); 2814f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } else { 2815f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++ [temp.deduct.call]p2: 2816f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // If P is not a reference type: 2817f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If A is an array type, the pointer type produced by the 2818f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // array-to-pointer standard conversion (4.2) is used in place of 2819f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // A for type deduction; otherwise, 2820f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType->isArrayType()) 2821f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getArrayDecayedType(ArgType); 2822f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If A is a function type, the pointer type produced by the 2823f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // function-to-pointer standard conversion (4.3) is used in place 2824f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // of A for type deduction; otherwise, 2825f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else if (ArgType->isFunctionType()) 2826f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType = S.Context.getPointerType(ArgType); 2827f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else { 28280099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - If A is a cv-qualified type, the top level cv-qualifiers of A's 2829f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type are ignored for type deduction. 2830a459cc26f6c895ae48742a36203f753cea8b3e91Douglas Gregor ArgType = ArgType.getUnqualifiedType(); 2831f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2832f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 2833dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2834f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p4: 2835f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // In general, the deduction process attempts to find template argument 2836f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // values that will make the deduced A identical to A (after the type A 2837f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // is transformed as described above). [...] 2838f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF = TDF_SkipNonDependent; 2839dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2840f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If the original P is a reference type, the deduced A (i.e., the 2841f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type referred to by the reference) can be more cv-qualified than 2842f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the transformed A. 2843f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ParamRefType) 2844f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_ParamWithReferenceType; 2845f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - The transformed A can be another pointer or pointer to member 2846f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // type that can be converted to the deduced A via a qualification 2847f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // conversion (4.4). 2848f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgType->isPointerType() || ArgType->isMemberPointerType() || 2849f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ArgType->isObjCObjectPointerType()) 2850f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_IgnoreQualifiers; 2851f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // - If P is a class and P has the form simple-template-id, then the 2852f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // transformed A can be a derived class of the deduced A. Likewise, 2853f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // if P is a pointer to a class of the form simple-template-id, the 2854f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // transformed A can be a pointer to a derived class pointed to by 2855f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // the deduced A. 2856f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (isSimpleTemplateIdType(ParamType) || 2857f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor (isa<PointerType>(ParamType) && 2858f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor isSimpleTemplateIdType( 2859f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType->getAs<PointerType>()->getPointeeType()))) 2860f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF |= TDF_DerivedClass; 2861dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2862f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return false; 2863f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor} 2864f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor 2865dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregorstatic bool hasDeducibleTemplateParameters(Sema &S, 2866dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor FunctionTemplateDecl *FunctionTemplate, 2867dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType T); 2868dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2869e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \brief Perform template argument deduction from a function call 2870e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// (C++ [temp.deduct.call]). 2871e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2872e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param FunctionTemplate the function template for which we are performing 2873e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// template argument deduction. 2874e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 287548026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// \param ExplicitTemplateArguments the explicit template arguments provided 287648026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// for this call. 28776db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor/// 2878e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Args the function call arguments 2879e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2880e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param NumArgs the number of arguments in Args 2881e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 288248026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// \param Name the name of the function being called. This is only significant 288348026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// when the function template is a conversion function template, in which 288448026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// case this routine will also perform template argument deduction based on 2885dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// the function to which 288648026d26fb58e413544874eead5491b1452e2ebfDouglas Gregor/// 2887e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Specialization if template argument deduction was successful, 28881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// this will be set to the function template specialization produced by 2889e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// template argument deduction. 2890e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2891e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \param Info the argument will be updated to provide additional information 2892e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// about template argument deduction. 2893e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// 2894e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor/// \returns the result of template argument deduction. 2895e53060fa78ad7e98352049f72787bdb7543e2a48Douglas GregorSema::TemplateDeductionResult 2896e53060fa78ad7e98352049f72787bdb7543e2a48Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 289767714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 2898e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor Expr **Args, unsigned NumArgs, 2899e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor FunctionDecl *&Specialization, 2900e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor TemplateDeductionInfo &Info) { 2901e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 29026db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor 2903e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // C++ [temp.deduct.call]p1: 2904e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // Template argument deduction is done by comparing each function template 2905e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // parameter type (call it P) with the type of the corresponding argument 2906e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor // of the call (call it A) as described below. 2907e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor unsigned CheckArgs = NumArgs; 29086db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor if (NumArgs < Function->getMinRequiredArguments()) 2909e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor return TDK_TooFewArguments; 2910e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor else if (NumArgs > Function->getNumParams()) { 29111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const FunctionProtoType *Proto 2912183700f494ec9b6701b6efe82bcb25f4c79ba561John McCall = Function->getType()->getAs<FunctionProtoType>(); 2913f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (Proto->isTemplateVariadic()) 2914f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor /* Do nothing */; 2915f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor else if (Proto->isVariadic()) 2916f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor CheckArgs = Function->getNumParams(); 2917dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi else 2918e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor return TDK_TooManyArguments; 2919e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 29201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29216db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // The types of the parameters from which we will perform template argument 29226db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // deduction. 29232a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 2924e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor TemplateParameterList *TemplateParams 2925e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor = FunctionTemplate->getTemplateParameters(); 29265f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 29275f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> ParamTypes; 292802024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified = 0; 2929d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs) { 293083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionResult Result = 293183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor SubstituteExplicitTemplateArguments(FunctionTemplate, 2932d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall *ExplicitTemplateArgs, 293383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Deduced, 293483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor ParamTypes, 293583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 0, 293683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor Info); 293783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor if (Result) 293883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return Result; 293902024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 294002024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified = Deduced.size(); 29416db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor } else { 29426db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // Just fill in the parameter types from the function declaration. 2943f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) 29446db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor ParamTypes.push_back(Function->getParamDecl(I)->getType()); 29456db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor } 29461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 29476db8ed4498b83fe9336e3855a4ba1a298b04ee00Douglas Gregor // Deduce template arguments from the function parameters. 29481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced.resize(TemplateParams->size()); 2949f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned ArgIdx = 0; 29505f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<OriginalCallArg, 4> OriginalCallArgs; 2951dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi for (unsigned ParamIdx = 0, NumParams = ParamTypes.size(); 2952f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamIdx != NumParams; ++ParamIdx) { 2953dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType OrigParamType = ParamTypes[ParamIdx]; 2954dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType ParamType = OrigParamType; 2955dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2956dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi const PackExpansionType *ParamExpansion 2957f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor = dyn_cast<PackExpansionType>(ParamType); 2958f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (!ParamExpansion) { 2959f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Simple case: matching a function parameter to a function argument. 2960f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (ArgIdx >= CheckArgs) 2961f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 2962dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2963f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg = Args[ArgIdx++]; 2964f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ArgType = Arg->getType(); 2965dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2966f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned TDF = 0; 2967f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, 2968f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Arg, 2969f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) 2970f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor continue; 2971dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2972d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor // If we have nothing to deduce, we're done. 2973d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor if (!hasDeducibleTemplateParameters(*this, FunctionTemplate, ParamType)) 2974d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor continue; 2975d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor 2976dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // Keep track of the argument type and corresponding parameter index, 2977dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // so we can check for compatibility between the deduced A and A. 2978d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor OriginalCallArgs.push_back(OriginalCallArg(OrigParamType, ArgIdx-1, 2979d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor ArgType)); 2980dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 2981f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (TemplateDeductionResult Result 2982d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor = ::DeduceTemplateArguments(*this, TemplateParams, 2983d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor ParamType, ArgType, Info, Deduced, 2984d8f5b333f96b4e8018ff3a0d0db62d9e78eb6bddDouglas Gregor TDF)) 2985f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return Result; 29861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2987f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor continue; 298875f21af57f3dce1577d6c27bbe7bb45b49ced732Douglas Gregor } 2989dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 2990f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // C++0x [temp.deduct.call]p1: 2991dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // For a function parameter pack that occurs at the end of the 2992dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter-declaration-list, the type A of each remaining argument of 2993dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the call is compared with the type P of the declarator-id of the 2994dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // function parameter pack. Each comparison deduces template arguments 2995dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // for subsequent positions in the template parameter packs expanded by 29967d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // the function parameter pack. For a function parameter pack that does 2997dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // not occur at the end of the parameter-declaration-list, the type of 29987d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor // the parameter pack is a non-deduced context. 29997d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor if (ParamIdx + 1 < NumParams) 30007d5c0c1273bdc1cb3dff1cb5a62d07b1439e82c7Douglas Gregor break; 3001dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3002f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ParamPattern = ParamExpansion->getPattern(); 30035f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<unsigned, 2> PackIndices; 3004f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor { 3005f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor llvm::BitVector SawIndices(TemplateParams->size()); 30065f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<UnexpandedParameterPack, 2> Unexpanded; 3007f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor collectUnexpandedParameterPacks(ParamPattern, Unexpanded); 3008f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { 3009f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned Depth, Index; 3010f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); 3011f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (Depth == 0 && !SawIndices[Index]) { 3012f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor SawIndices[Index] = true; 3013f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor PackIndices.push_back(Index); 3014f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3015f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3016f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3017f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); 3018dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3019d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // Keep track of the deduced template arguments for each parameter pack 3020dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // expanded by this pack expansion (the outer index) and for each 3021d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor // template argument (the inner SmallVectors). 30225f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> 3023d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor NewlyDeducedPacks(PackIndices.size()); 30245f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 2> 3025d3731198193eee92796ddeb493973b7a598b003eDouglas Gregor SavedPacks(PackIndices.size()); 30265429385919a2b6fb3708635b967221705f4b1dafDouglas Gregor PrepareArgumentPackDeduction(*this, Deduced, PackIndices, SavedPacks, 3027dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi NewlyDeducedPacks); 3028f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor bool HasAnyArguments = false; 3029f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (; ArgIdx < NumArgs; ++ArgIdx) { 3030f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor HasAnyArguments = true; 3031dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3032dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType OrigParamType = ParamPattern; 3033dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor ParamType = OrigParamType; 3034f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor Expr *Arg = Args[ArgIdx]; 3035f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor QualType ArgType = Arg->getType(); 3036dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 3037f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor unsigned TDF = 0; 3038f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, 3039f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Arg, 3040f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) { 3041f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // We can't actually perform any deduction for this argument, so stop 3042f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // deduction at this point. 3043f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ++ArgIdx; 3044f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 3045f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3046dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3047dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // Keep track of the argument type and corresponding argument index, 3048dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor // so we can check for compatibility between the deduced A and A. 3049dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (hasDeducibleTemplateParameters(*this, FunctionTemplate, ParamType)) 3050dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor OriginalCallArgs.push_back(OriginalCallArg(OrigParamType, ArgIdx, 3051dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor ArgType)); 3052dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 3053f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (TemplateDeductionResult Result 3054f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor = ::DeduceTemplateArguments(*this, TemplateParams, 3055f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor ParamType, ArgType, Info, Deduced, 3056f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor TDF)) 3057f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor return Result; 3058eff92135d32039c9874dc356f3e93143af6069c1John McCall 3059f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Capture the deduced template arguments for each parameter pack expanded 3060f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // by this pack expansion, add them to the list of arguments we've deduced 3061f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // for that pack, then clear out the deduced argument. 3062f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { 3063f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; 3064f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor if (!DeducedArg.isNull()) { 3065f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor NewlyDeducedPacks[I].push_back(DeducedArg); 3066f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor DeducedArg = DeducedTemplateArgument(); 3067f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor } 3068e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 3069e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 3070dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3071f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // Build argument packs for each of the parameter packs expanded by this 3072f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // pack expansion. 30730216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor if (Sema::TemplateDeductionResult Result 3074dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishArgumentPackDeduction(*this, TemplateParams, HasAnyArguments, 30750216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor Deduced, PackIndices, SavedPacks, 30760216f8121df32b320cab659d5b703fee50cdfda5Douglas Gregor NewlyDeducedPacks, Info)) 3077dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi return Result; 30781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3079f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor // After we've matching against a parameter pack, we're done. 3080f5c65ffbd7374b6c8d9f1e361041578640cab320Douglas Gregor break; 3081e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor } 308265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 30831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 308402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified, 3085dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor Specialization, Info, &OriginalCallArgs); 308683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor} 3087127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor 308883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \brief Deduce template arguments when taking the address of a function 30894b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template (C++ [temp.deduct.funcaddr]) or matching a specialization to 30904b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// a template. 309183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 309283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param FunctionTemplate the function template for which we are performing 309383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template argument deduction. 309483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 3095dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param ExplicitTemplateArguments the explicitly-specified template 30964b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// arguments. 309783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 309883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param ArgFunctionType the function type that will be used as the 309983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// "argument" type (A) when performing template argument deduction from the 31004b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// function template's function type. This type may be NULL, if there is no 31014b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// argument type to compare against, in C++0x [temp.arg.explicit]p3. 310283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 310383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Specialization if template argument deduction was successful, 31041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// this will be set to the function template specialization produced by 310583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// template argument deduction. 310683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 310783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \param Info the argument will be updated to provide additional information 310883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// about template argument deduction. 310983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// 311083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor/// \returns the result of template argument deduction. 311183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::TemplateDeductionResult 311283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 311367714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 311483314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType ArgFunctionType, 311583314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *&Specialization, 311683314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateDeductionInfo &Info) { 311783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 311883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor TemplateParameterList *TemplateParams 311983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor = FunctionTemplate->getTemplateParameters(); 312083314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor QualType FunctionType = Function->getType(); 31211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 312283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Substitute any explicit template arguments. 31232a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 31245f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 312502024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor unsigned NumExplicitlySpecified = 0; 31265f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> ParamTypes; 3127d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall if (ExplicitTemplateArgs) { 31281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (TemplateDeductionResult Result 31291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump = SubstituteExplicitTemplateArguments(FunctionTemplate, 3130d5532b6cfff2977e0c59fa6ead7f7973984a620dJohn McCall *ExplicitTemplateArgs, 31311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced, ParamTypes, 313283314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor &FunctionType, Info)) 313383314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor return Result; 313402024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor 313502024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor NumExplicitlySpecified = Deduced.size(); 3136127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor } 313783314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 313883314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Template argument deduction for function templates in a SFINAE context. 313983314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor // Trap any errors that might occur. 31401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 31411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3142eff92135d32039c9874dc356f3e93143af6069c1John McCall Deduced.resize(TemplateParams->size()); 3143eff92135d32039c9874dc356f3e93143af6069c1John McCall 31444b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor if (!ArgFunctionType.isNull()) { 31454b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor // Deduce template arguments from the function type. 31464b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor if (TemplateDeductionResult Result 3147a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = ::DeduceTemplateArguments(*this, TemplateParams, 31484b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor FunctionType, ArgFunctionType, Info, 314973b3cf6503f72f054288cf474e1a8c8ae56383c2Douglas Gregor Deduced, TDF_TopLevelParameterTypeList)) 31504b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor return Result; 31514b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor } 3152fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 3153dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (TemplateDeductionResult Result 3154fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 3155fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor NumExplicitlySpecified, 3156fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor Specialization, Info)) 3157fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return Result; 3158fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 3159fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor // If the requested function type does not match the actual type of the 3160fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor // specialization, template argument deduction fails. 3161fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor if (!ArgFunctionType.isNull() && 3162fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor !Context.hasSameType(ArgFunctionType, Specialization->getType())) 3163fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return TDK_NonDeducedMismatch; 3164fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor 3165fbb6fad63acac2bef36cfa13e0706fa3e2a1ed7dDouglas Gregor return TDK_Success; 3166e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor} 3167e53060fa78ad7e98352049f72787bdb7543e2a48Douglas Gregor 316865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \brief Deduce template arguments for a templated conversion 316965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// function (C++ [temp.deduct.conv]) and, if successful, produce a 317065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// conversion function template specialization. 317165ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::TemplateDeductionResult 317265ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 317365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType ToType, 317465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor CXXConversionDecl *&Specialization, 317565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateDeductionInfo &Info) { 31761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump CXXConversionDecl *Conv 317765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor = cast<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()); 317865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType FromType = Conv->getConversionType(); 317965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 318065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Canonicalize the types for deduction. 318165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType P = Context.getCanonicalType(FromType); 318265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor QualType A = Context.getCanonicalType(ToType); 318365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 31845453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p2: 318565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // If P is a reference type, the type referred to by P is used for 318665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type deduction. 318765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (const ReferenceType *PRef = P->getAs<ReferenceType>()) 318865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = PRef->getPointeeType(); 318965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 31905453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p4: 31915453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // [...] If A is a reference type, the type referred to by A is used 319265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // for type deduction. 319365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (const ReferenceType *ARef = A->getAs<ReferenceType>()) 31945453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor A = ARef->getPointeeType().getUnqualifiedType(); 31955453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++ [temp.deduct.conv]p3: 319665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // 31971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // If A is not a reference type: 319865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else { 319965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor assert(!A->isReferenceType() && "Reference types were handled above"); 320065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 320165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is an array type, the pointer type produced by the 32021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // array-to-pointer standard conversion (4.2) is used in place 320365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // of P for type deduction; otherwise, 320465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (P->isArrayType()) 320565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = Context.getArrayDecayedType(P); 320665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is a function type, the pointer type produced by the 320765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // function-to-pointer standard conversion (4.3) is used in 320865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // place of P for type deduction; otherwise, 320965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else if (P->isFunctionType()) 321065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = Context.getPointerType(P); 321165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If P is a cv-qualified type, the top level cv-qualifiers of 32120099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // P's type are ignored for type deduction. 321365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor else 321465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P = P.getUnqualifiedType(); 321565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 32165453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // C++0x [temp.deduct.conv]p4: 32170099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // If A is a cv-qualified type, the top level cv-qualifiers of A's 32185453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // type are ignored for type deduction. If A is a reference type, the type 32195453d93ab8668f2d9d0bc02182695b02d207e32dDouglas Gregor // referred to by A is used for type deduction. 322065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor A = A.getUnqualifiedType(); 322165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor } 322265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 322365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Template argument deduction for function templates in a SFINAE context. 322465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Trap any errors that might occur. 32251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump SFINAETrap Trap(*this); 322665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 322765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // C++ [temp.deduct.conv]p1: 322865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Template argument deduction is done by comparing the return 322965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type of the template conversion function (call it P) with the 323065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // type that is required as the result of the conversion (call it 323165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // A) as described in 14.8.2.4. 323265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateParameterList *TemplateParams 323365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor = FunctionTemplate->getTemplateParameters(); 32345f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 32351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Deduced.resize(TemplateParams->size()); 323665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 323765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // C++0x [temp.deduct.conv]p4: 323865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // In general, the deduction process attempts to find template 323965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // argument values that will make the deduced A identical to 324065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // A. However, there are two cases that allow a difference: 324165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor unsigned TDF = 0; 324265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - If the original A is a reference type, A can be more 324365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // cv-qualified than the deduced A (i.e., the type referred to 324465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // by the reference) 324565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (ToType->isReferenceType()) 324665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TDF |= TDF_ParamWithReferenceType; 324765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // - The deduced A can be another pointer or pointer to member 32480099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // type that can be converted to A via a qualification 324965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // conversion. 325065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // 325165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // (C++0x [temp.deduct.conv]p6 clarifies that this only happens when 325265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // both P and A are pointers or member pointers. In this case, we 325365ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // just ignore cv-qualifiers completely). 325465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if ((P->isPointerType() && A->isPointerType()) || 32552cae1e216c12c7574f5ac59cb0844d22bed9401dDouglas Gregor (P->isMemberPointerType() && A->isMemberPointerType())) 325665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TDF |= TDF_IgnoreQualifiers; 325765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (TemplateDeductionResult Result 3258a7ef13024e4cc3dfb75e3bc1695371b39d9a5240Chandler Carruth = ::DeduceTemplateArguments(*this, TemplateParams, 325965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor P, A, Info, Deduced, TDF)) 326065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return Result; 326165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 326265ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor // Finish template argument deduction. 32632a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall LocalInstantiationScope InstScope(*this); 326465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor FunctionDecl *Spec = 0; 326565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor TemplateDeductionResult Result 3266dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 0, Spec, 326702024a9f0d8e6c898de276193af604c42ee41269Douglas Gregor Info); 326865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor Specialization = cast_or_null<CXXConversionDecl>(Spec); 326965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return Result; 327065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor} 327165ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor 32724b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \brief Deduce template arguments for a function template when there is 32734b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// nothing to deduce against (C++0x [temp.arg.explicit]p3). 32744b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 32754b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param FunctionTemplate the function template for which we are performing 32764b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template argument deduction. 32774b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 3278dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param ExplicitTemplateArguments the explicitly-specified template 32794b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// arguments. 32804b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 32814b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param Specialization if template argument deduction was successful, 32824b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// this will be set to the function template specialization produced by 32834b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// template argument deduction. 32844b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 32854b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \param Info the argument will be updated to provide additional information 32864b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// about template argument deduction. 32874b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// 32884b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor/// \returns the result of template argument deduction. 32894b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas GregorSema::TemplateDeductionResult 32904b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas GregorSema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, 329167714230a191bc3c01f33378f34f34ef377991a6Douglas Gregor TemplateArgumentListInfo *ExplicitTemplateArgs, 32924b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor FunctionDecl *&Specialization, 32934b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor TemplateDeductionInfo &Info) { 32944b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor return DeduceTemplateArguments(FunctionTemplate, ExplicitTemplateArgs, 32954b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor QualType(), Specialization, Info); 32964b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor} 32974b52e25f3b05ab0f9d2492276a52323a50a84fb7Douglas Gregor 329834b41d939a1328f484511c6002ba2456db879a29Richard Smithnamespace { 329934b41d939a1328f484511c6002ba2456db879a29Richard Smith /// Substitute the 'auto' type specifier within a type for a given replacement 330034b41d939a1328f484511c6002ba2456db879a29Richard Smith /// type. 330134b41d939a1328f484511c6002ba2456db879a29Richard Smith class SubstituteAutoTransform : 330234b41d939a1328f484511c6002ba2456db879a29Richard Smith public TreeTransform<SubstituteAutoTransform> { 330334b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Replacement; 330434b41d939a1328f484511c6002ba2456db879a29Richard Smith public: 330534b41d939a1328f484511c6002ba2456db879a29Richard Smith SubstituteAutoTransform(Sema &SemaRef, QualType Replacement) : 330634b41d939a1328f484511c6002ba2456db879a29Richard Smith TreeTransform<SubstituteAutoTransform>(SemaRef), Replacement(Replacement) { 330734b41d939a1328f484511c6002ba2456db879a29Richard Smith } 330834b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType TransformAutoType(TypeLocBuilder &TLB, AutoTypeLoc TL) { 330934b41d939a1328f484511c6002ba2456db879a29Richard Smith // If we're building the type pattern to deduce against, don't wrap the 331034b41d939a1328f484511c6002ba2456db879a29Richard Smith // substituted type in an AutoType. Certain template deduction rules 331134b41d939a1328f484511c6002ba2456db879a29Richard Smith // apply only when a template type parameter appears directly (and not if 331234b41d939a1328f484511c6002ba2456db879a29Richard Smith // the parameter is found through desugaring). For instance: 331334b41d939a1328f484511c6002ba2456db879a29Richard Smith // auto &&lref = lvalue; 331434b41d939a1328f484511c6002ba2456db879a29Richard Smith // must transform into "rvalue reference to T" not "rvalue reference to 331534b41d939a1328f484511c6002ba2456db879a29Richard Smith // auto type deduced as T" in order for [temp.deduct.call]p3 to apply. 331634b41d939a1328f484511c6002ba2456db879a29Richard Smith if (isa<TemplateTypeParmType>(Replacement)) { 331734b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Result = Replacement; 331834b41d939a1328f484511c6002ba2456db879a29Richard Smith TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result); 331934b41d939a1328f484511c6002ba2456db879a29Richard Smith NewTL.setNameLoc(TL.getNameLoc()); 332034b41d939a1328f484511c6002ba2456db879a29Richard Smith return Result; 332134b41d939a1328f484511c6002ba2456db879a29Richard Smith } else { 332234b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType Result = RebuildAutoType(Replacement); 332334b41d939a1328f484511c6002ba2456db879a29Richard Smith AutoTypeLoc NewTL = TLB.push<AutoTypeLoc>(Result); 332434b41d939a1328f484511c6002ba2456db879a29Richard Smith NewTL.setNameLoc(TL.getNameLoc()); 332534b41d939a1328f484511c6002ba2456db879a29Richard Smith return Result; 332634b41d939a1328f484511c6002ba2456db879a29Richard Smith } 332734b41d939a1328f484511c6002ba2456db879a29Richard Smith } 332834b41d939a1328f484511c6002ba2456db879a29Richard Smith }; 332934b41d939a1328f484511c6002ba2456db879a29Richard Smith} 333034b41d939a1328f484511c6002ba2456db879a29Richard Smith 333134b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \brief Deduce the type for an auto type-specifier (C++0x [dcl.spec.auto]p6) 333234b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 333334b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Type the type pattern using the auto type-specifier. 333434b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 333534b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Init the initializer for the variable whose type is to be deduced. 333634b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 333734b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \param Result if type deduction was successful, this will be set to the 333834b41d939a1328f484511c6002ba2456db879a29Richard Smith/// deduced type. This may still contain undeduced autos if the type is 3339a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// dependent. This will be set to null if deduction succeeded, but auto 3340a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// substitution failed; the appropriate diagnostic will already have been 3341a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith/// produced in that case. 334234b41d939a1328f484511c6002ba2456db879a29Richard Smith/// 334334b41d939a1328f484511c6002ba2456db879a29Richard Smith/// \returns true if deduction succeeded, false if it failed. 334434b41d939a1328f484511c6002ba2456db879a29Richard Smithbool 3345a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard SmithSema::DeduceAutoType(TypeSourceInfo *Type, Expr *Init, 3346a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith TypeSourceInfo *&Result) { 334734b41d939a1328f484511c6002ba2456db879a29Richard Smith if (Init->isTypeDependent()) { 334834b41d939a1328f484511c6002ba2456db879a29Richard Smith Result = Type; 334934b41d939a1328f484511c6002ba2456db879a29Richard Smith return true; 335034b41d939a1328f484511c6002ba2456db879a29Richard Smith } 335134b41d939a1328f484511c6002ba2456db879a29Richard Smith 335234b41d939a1328f484511c6002ba2456db879a29Richard Smith SourceLocation Loc = Init->getExprLoc(); 335334b41d939a1328f484511c6002ba2456db879a29Richard Smith 335434b41d939a1328f484511c6002ba2456db879a29Richard Smith LocalInstantiationScope InstScope(*this); 335534b41d939a1328f484511c6002ba2456db879a29Richard Smith 335634b41d939a1328f484511c6002ba2456db879a29Richard Smith // Build template<class TemplParam> void Func(FuncParam); 33574fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth TemplateTypeParmDecl *TemplParam = 33584fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth TemplateTypeParmDecl::Create(Context, 0, SourceLocation(), Loc, 0, 0, 0, 33594fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth false, false); 33604fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth QualType TemplArg = QualType(TemplParam->getTypeForDecl(), 0); 33614fb86f8c4585e53c21c847ad3de9e3b2de123cd9Chandler Carruth NamedDecl *TemplParamPtr = TemplParam; 3362483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith FixedSizeTemplateParameterList<1> TemplateParams(Loc, Loc, &TemplParamPtr, 3363483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith Loc); 3364483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith 3365a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith TypeSourceInfo *FuncParamInfo = 336634b41d939a1328f484511c6002ba2456db879a29Richard Smith SubstituteAutoTransform(*this, TemplArg).TransformType(Type); 3367a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith assert(FuncParamInfo && "substituting template parameter for 'auto' failed"); 3368a085da86242c9b8e3466f8cf6f4397e9f248fd20Richard Smith QualType FuncParam = FuncParamInfo->getType(); 336934b41d939a1328f484511c6002ba2456db879a29Richard Smith 337034b41d939a1328f484511c6002ba2456db879a29Richard Smith // Deduce type of TemplParam in Func(Init) 33715f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 1> Deduced; 337234b41d939a1328f484511c6002ba2456db879a29Richard Smith Deduced.resize(1); 337334b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType InitType = Init->getType(); 337434b41d939a1328f484511c6002ba2456db879a29Richard Smith unsigned TDF = 0; 3375483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith if (AdjustFunctionParmAndArgTypesForDeduction(*this, &TemplateParams, 337634b41d939a1328f484511c6002ba2456db879a29Richard Smith FuncParam, InitType, Init, 337734b41d939a1328f484511c6002ba2456db879a29Richard Smith TDF)) 337834b41d939a1328f484511c6002ba2456db879a29Richard Smith return false; 337934b41d939a1328f484511c6002ba2456db879a29Richard Smith 338034b41d939a1328f484511c6002ba2456db879a29Richard Smith TemplateDeductionInfo Info(Context, Loc); 3381483b9f3bc05c5409e2c6643f1c9d91e21c8ff9d2Richard Smith if (::DeduceTemplateArguments(*this, &TemplateParams, 338234b41d939a1328f484511c6002ba2456db879a29Richard Smith FuncParam, InitType, Info, Deduced, 338334b41d939a1328f484511c6002ba2456db879a29Richard Smith TDF)) 338434b41d939a1328f484511c6002ba2456db879a29Richard Smith return false; 338534b41d939a1328f484511c6002ba2456db879a29Richard Smith 338634b41d939a1328f484511c6002ba2456db879a29Richard Smith QualType DeducedType = Deduced[0].getAsType(); 338734b41d939a1328f484511c6002ba2456db879a29Richard Smith if (DeducedType.isNull()) 338834b41d939a1328f484511c6002ba2456db879a29Richard Smith return false; 33899a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor 339034b41d939a1328f484511c6002ba2456db879a29Richard Smith Result = SubstituteAutoTransform(*this, DeducedType).TransformType(Type); 33919a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor 33929a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor // Check that the deduced argument type is compatible with the original 33939a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor // argument type per C++ [temp.deduct.call]p4. 33949a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor if (Result && 33959a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor CheckOriginalCallArgDeduction(*this, 33969a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor Sema::OriginalCallArg(FuncParam,0,InitType), 33979a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor Result->getType())) { 33989a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor Result = 0; 33999a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor return false; 34009a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor } 34019a636e8403287af0d4db8fe5bf49dee719f5b754Douglas Gregor 340234b41d939a1328f484511c6002ba2456db879a29Richard Smith return true; 340334b41d939a1328f484511c6002ba2456db879a29Richard Smith} 340434b41d939a1328f484511c6002ba2456db879a29Richard Smith 34058a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregorstatic void 3406e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, QualType T, 3407e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3408ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Level, 34095f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Deduced); 3410dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3411dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \brief If this is a non-static member function, 341277bc572138543ef97ebec137522b763d6a6ee909Douglas Gregorstatic void MaybeAddImplicitObjectParameterType(ASTContext &Context, 341377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor CXXMethodDecl *Method, 34145f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<QualType> &ArgTypes) { 341577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor if (Method->isStatic()) 341677bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor return; 341777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 341877bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // C++ [over.match.funcs]p4: 341977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // 342077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // For non-static member functions, the type of the implicit 342177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // object parameter is 34220099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - "lvalue reference to cv X" for functions declared without a 342377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // ref-qualifier or with the & ref-qualifier 342477bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // - "rvalue reference to cv X" for functions declared with the 342577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // && ref-qualifier 342677bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // 342777bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor // FIXME: We don't have ref-qualifiers yet, so we don't do that part. 342877bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor QualType ArgTy = Context.getTypeDeclType(Method->getParent()); 342977bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTy = Context.getQualifiedType(ArgTy, 343077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor Qualifiers::fromCVRMask(Method->getTypeQualifiers())); 343177bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTy = Context.getLValueReferenceType(ArgTy); 343277bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor ArgTypes.push_back(ArgTy); 343377bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor} 343477bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 34358a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// \brief Determine whether the function template \p FT1 is at least as 34368a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// specialized as \p FT2. 34378a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregorstatic bool isAtLeastAsSpecializedAs(Sema &S, 34385769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc, 34398a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionTemplateDecl *FT1, 34408a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionTemplateDecl *FT2, 34418a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor TemplatePartialOrderingContext TPOC, 3442dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned NumCallArguments, 34435f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<RefParamPartialOrderingComparison> *RefParamComparisons) { 34448a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor FunctionDecl *FD1 = FT1->getTemplatedDecl(); 3445dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionDecl *FD2 = FT2->getTemplatedDecl(); 34468a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor const FunctionProtoType *Proto1 = FD1->getType()->getAs<FunctionProtoType>(); 34478a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor const FunctionProtoType *Proto2 = FD2->getType()->getAs<FunctionProtoType>(); 3448dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 34498a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor assert(Proto1 && Proto2 && "Function templates must have prototypes"); 34508a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor TemplateParameterList *TemplateParams = FT2->getTemplateParameters(); 34515f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 34528a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Deduced.resize(TemplateParams->size()); 34538a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 34548a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p3: 34558a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // The types used to determine the ordering depend on the context in which 34568a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // the partial ordering is done: 34572a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(S.Context, Loc); 34588d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor CXXMethodDecl *Method1 = 0; 34598d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor CXXMethodDecl *Method2 = 0; 34608d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor bool IsNonStatic2 = false; 34618d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor bool IsNonStatic1 = false; 34628d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor unsigned Skip2 = 0; 34638a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor switch (TPOC) { 34648a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Call: { 34658a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // - In the context of a function call, the function parameter types are 34668a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // used. 34678d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Method1 = dyn_cast<CXXMethodDecl>(FD1); 34688d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Method2 = dyn_cast<CXXMethodDecl>(FD2); 34698d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic1 = Method1 && !Method1->isStatic(); 34708d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic2 = Method2 && !Method2->isStatic(); 34718d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor 34728d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // C++0x [temp.func.order]p3: 34738d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // [...] If only one of the function templates is a non-static 34748d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // member, that function template is considered to have a new 34758d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // first parameter inserted in its function parameter list. The 34768d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // new parameter is of type "reference to cv A," where cv are 34778d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // the cv-qualifiers of the function template (if any) and A is 34788d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // the class of which the function template is a member. 34798d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // 34808d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // C++98/03 doesn't have this provision, so instead we drop the 34818d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // first argument of the free function or static member, which 34828d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor // seems to match existing practice. 34835f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> Args1; 3484dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned Skip1 = !S.getLangOptions().CPlusPlus0x && 34858d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic2 && !IsNonStatic1; 34868d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor if (S.getLangOptions().CPlusPlus0x && IsNonStatic1 && !IsNonStatic2) 3487dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MaybeAddImplicitObjectParameterType(S.Context, Method1, Args1); 3488dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Args1.insert(Args1.end(), 34898d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Proto1->arg_type_begin() + Skip1, Proto1->arg_type_end()); 349077bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor 34915f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<QualType, 4> Args2; 3492dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Skip2 = !S.getLangOptions().CPlusPlus0x && 34938d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor IsNonStatic1 && !IsNonStatic2; 34948d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor if (S.getLangOptions().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) 349577bc572138543ef97ebec137522b763d6a6ee909Douglas Gregor MaybeAddImplicitObjectParameterType(S.Context, Method2, Args2); 3496dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Args2.insert(Args2.end(), 34978d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor Proto2->arg_type_begin() + Skip2, Proto2->arg_type_end()); 3498dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 34995c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // C++ [temp.func.order]p5: 35005c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // The presence of unused ellipsis and default arguments has no effect on 35015c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor // the partial ordering of function templates. 35025c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (Args1.size() > NumCallArguments) 35035c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args1.resize(NumCallArguments); 35045c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (Args2.size() > NumCallArguments) 35055c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args2.resize(NumCallArguments); 35065c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (DeduceTemplateArguments(S, TemplateParams, Args2.data(), Args2.size(), 35075c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Args1.data(), Args1.size(), Info, Deduced, 35085c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TDF_None, /*PartialOrdering=*/true, 3509b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons)) 35108a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 3511dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35128a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 35138a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3514dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35158a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Conversion: 35168a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // - In the context of a call to a conversion operator, the return types 35178a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // of the conversion function templates are used. 35185c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor if (DeduceTemplateArguments(S, TemplateParams, Proto2->getResultType(), 35195c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Proto1->getResultType(), Info, Deduced, 35205c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TDF_None, /*PartialOrdering=*/true, 3521b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons)) 35228a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 35238a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 3524dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35258a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Other: 35260099530a2288df7c2140dd8992b7310b9f6930a9NAKAMURA Takumi // - In other contexts (14.6.6.2) the function template's function type 35278a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // is used. 3528dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (DeduceTemplateArguments(S, TemplateParams, FD2->getType(), 35295c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor FD1->getType(), Info, Deduced, TDF_None, 3530b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*PartialOrdering=*/true, RefParamComparisons)) 35318a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 35328a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 35338a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3534dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35358a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p11: 3536dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // In most cases, all template parameters must have values in order for 3537dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // deduction to succeed, but for partial ordering purposes a template 3538dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // parameter may remain without a value provided it is not used in the 35398a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // types being used for partial ordering. [ Note: a template parameter used 35408a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // in a non-deduced context is considered used. -end note] 35418a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor unsigned ArgIdx = 0, NumArgs = Deduced.size(); 35428a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor for (; ArgIdx != NumArgs; ++ArgIdx) 35438a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Deduced[ArgIdx].isNull()) 35448a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 35458a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 35468a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (ArgIdx == NumArgs) { 3547dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // All template arguments were deduced. FT1 is at least as specialized 35488a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // as FT2. 35498a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return true; 35508a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 35518a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 3552e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // Figure out which template parameters were used. 35535f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<bool, 4> UsedParameters; 35548a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor UsedParameters.resize(TemplateParams->size()); 35558a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor switch (TPOC) { 35568a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Call: { 3557dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi unsigned NumParams = std::min(NumCallArguments, 3558dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi std::min(Proto1->getNumArgs(), 35595c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Proto2->getNumArgs())); 35608d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor if (S.getLangOptions().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) 3561dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(S, Method2->getThisType(S.Context), false, 35628d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor TemplateParams->getDepth(), UsedParameters); 35638d706ecf488c4f548c4f8cf0aa08ea82a4d6a5baDouglas Gregor for (unsigned I = Skip2; I < NumParams; ++I) 3564dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(S, Proto2->getArgType(I), false, 3565ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3566e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor UsedParameters); 35678a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 35688a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3569dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35708a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Conversion: 3571dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(S, Proto2->getResultType(), false, 3572ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3573e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor UsedParameters); 35748a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 3575dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35768a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor case TPOC_Other: 3577dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(S, FD2->getType(), false, 3578ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor TemplateParams->getDepth(), 3579ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor UsedParameters); 35808a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor break; 35818a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3582dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35838a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor for (; ArgIdx != NumArgs; ++ArgIdx) 35848a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // If this argument had no value deduced but was used in one of the types 35858a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // used for partial ordering, then deduction fails. 35868a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Deduced[ArgIdx].isNull() && UsedParameters[ArgIdx]) 35878a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return false; 3588dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35898a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return true; 35908a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor} 3591dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 35929da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor/// \brief Determine whether this a function template whose parameter-type-list 35939da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor/// ends with a function parameter pack. 35949da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregorstatic bool isVariadicFunctionTemplate(FunctionTemplateDecl *FunTmpl) { 35959da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor FunctionDecl *Function = FunTmpl->getTemplatedDecl(); 35969da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor unsigned NumParams = Function->getNumParams(); 35979da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (NumParams == 0) 35989da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 3599dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36009da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor ParmVarDecl *Last = Function->getParamDecl(NumParams - 1); 36019da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (!Last->isParameterPack()) 36029da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 3603dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36049da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // Make sure that no previous parameter is a parameter pack. 36059da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor while (--NumParams > 0) { 36069da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (Function->getParamDecl(NumParams - 1)->isParameterPack()) 36079da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return false; 36089da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor } 3609dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36109da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return true; 36119da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor} 3612dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3613bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \brief Returns the more specialized function template according 361465ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// to the rules of function template partial ordering (C++ [temp.func.order]). 361565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 361665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \param FT1 the first function template 361765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 361865ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// \param FT2 the second function template 361965ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// 36208a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// \param TPOC the context in which we are performing partial ordering of 36218a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor/// function templates. 36221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// 36235c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param NumCallArguments The number of arguments in a call, used only 36245c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// when \c TPOC is \c TPOC_Call. 36255c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 3626bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \returns the more specialized function template. If neither 362765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor/// template is more specialized, returns NULL. 362865ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorFunctionTemplateDecl * 362965ec1fda479688d143fe2403242cd9c730c800a1Douglas GregorSema::getMoreSpecializedTemplate(FunctionTemplateDecl *FT1, 363065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor FunctionTemplateDecl *FT2, 36315769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc, 36325c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor TemplatePartialOrderingContext TPOC, 36335c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned NumCallArguments) { 36345f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<RefParamPartialOrderingComparison, 4> RefParamComparisons; 3635dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi bool Better1 = isAtLeastAsSpecializedAs(*this, Loc, FT1, FT2, TPOC, 36365c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor NumCallArguments, 0); 3637dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi bool Better2 = isAtLeastAsSpecializedAs(*this, Loc, FT2, FT1, TPOC, 36385c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor NumCallArguments, 3639b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor &RefParamComparisons); 3640dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36418a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (Better1 != Better2) // We have a clear winner 36428a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return Better1? FT1 : FT2; 3643dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 36448a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor if (!Better1 && !Better2) // Neither is better than the other 364565ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return 0; 36468a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor 36478a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p10: 3648dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If for each type being considered a given template is at least as 36498a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized for all types and more specialized for some set of types and 3650dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the other template is not more specialized for any types or is not at 36518a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // least as specialized for any types, then the given template is more 36528a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized than the other template. Otherwise, neither template is more 36538a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // specialized than the other. 36548a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Better1 = false; 36558a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor Better2 = false; 3656b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor for (unsigned I = 0, N = RefParamComparisons.size(); I != N; ++I) { 36578a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // C++0x [temp.deduct.partial]p9: 36588a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor // If, for a given type, deduction succeeds in both directions (i.e., the 3659b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // types are identical after the transformations above) and both P and A 3660b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // were reference types (before being replaced with the type referred to 3661b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // above): 3662b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor 3663dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // -- if the type from the argument template was an lvalue reference 3664b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // and the type from the parameter template was not, the argument 3665b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // type is considered to be more specialized than the other; 3666b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // otherwise, 3667b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (!RefParamComparisons[I].ArgIsRvalueRef && 3668b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons[I].ParamIsRvalueRef) { 3669b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better2 = true; 3670b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better1) 3671b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3672b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3673b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor } else if (!RefParamComparisons[I].ParamIsRvalueRef && 3674b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor RefParamComparisons[I].ArgIsRvalueRef) { 3675b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better1 = true; 3676b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better2) 3677b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3678b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3679b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor } 3680dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3681b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // -- if the type from the argument template is more cv-qualified than 3682b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // the type from the parameter template (as described above), the 3683b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // argument type is considered to be more specialized than the 3684b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // other; otherwise, 3685b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor switch (RefParamComparisons[I].Qualifiers) { 3686b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case NeitherMoreQualified: 3687b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor break; 3688dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3689b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case ParamMoreQualified: 3690b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better1 = true; 3691b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better2) 3692b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3693b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 3694dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3695b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor case ArgMoreQualified: 3696b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor Better2 = true; 3697b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor if (Better1) 3698b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor return 0; 3699b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor continue; 37008a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3701dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3702b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor // -- neither type is more specialized than the other. 37038a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor } 3704dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37058a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor assert(!(Better1 && Better2) && "Should have broken out in the loop above"); 370665ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor if (Better1) 370765ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor return FT1; 37088a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor else if (Better2) 37098a51491d936d8c50480f3c3ca6647be12a7ad51fDouglas Gregor return FT2; 3710dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37119da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // FIXME: This mimics what GCC implements, but doesn't match up with the 37129da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // proposed resolution for core issue 692. This area needs to be sorted out, 37139da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor // but for now we attempt to maintain compatibility. 37149da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor bool Variadic1 = isVariadicFunctionTemplate(FT1); 37159da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor bool Variadic2 = isVariadicFunctionTemplate(FT2); 37169da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor if (Variadic1 != Variadic2) 37179da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return Variadic1? FT2 : FT1; 3718dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 37199da95e6eefc4b0ca25e18bdab1b703f5c185deabDouglas Gregor return 0; 372065ec1fda479688d143fe2403242cd9c730c800a1Douglas Gregor} 372183314aa1cf61ed2458a8a20c83b2d4708192d5dcDouglas Gregor 3722d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \brief Determine if the two templates are equivalent. 3723d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregorstatic bool isSameTemplate(TemplateDecl *T1, TemplateDecl *T2) { 3724d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (T1 == T2) 3725d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return true; 3726dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3727d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (!T1 || !T2) 3728d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return false; 3729dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3730d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor return T1->getCanonicalDecl() == T2->getCanonicalDecl(); 3731d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor} 3732d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor 3733d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \brief Retrieve the most specialized of the given function template 3734d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specializations. 3735d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3736c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// \param SpecBegin the start iterator of the function template 3737c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// specializations that we will be comparing. 3738d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3739c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// \param SpecEnd the end iterator of the function template 3740c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// specializations, paired with \p SpecBegin. 3741d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3742d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param TPOC the partial ordering context to use to compare the function 3743d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// template specializations. 3744d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 37455c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// \param NumCallArguments The number of arguments in a call, used only 37465c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// when \c TPOC is \c TPOC_Call. 37475c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor/// 3748dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param Loc the location where the ambiguity or no-specializations 3749d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// diagnostic should occur. 3750d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3751d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param NoneDiag partial diagnostic used to diagnose cases where there are 3752d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// no matching candidates. 3753d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3754d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param AmbigDiag partial diagnostic used to diagnose an ambiguity, if one 3755d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// occurs. 3756d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3757d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// \param CandidateDiag partial diagnostic used for each function template 3758d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specialization that is a candidate in the ambiguous ordering. One parameter 3759d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// in this diagnostic should be unbound, which will correspond to the string 3760d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// describing the template arguments for the function template specialization. 3761d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3762dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \param Index if non-NULL and the result of this function is non-nULL, 3763d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// receives the index corresponding to the resulting function template 3764d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// specialization. 3765d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3766dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \returns the most specialized function template specialization, if 3767c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall/// found. Otherwise, returns SpecEnd. 3768d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// 3769dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi/// \todo FIXME: Consider passing in the "also-ran" candidates that failed 3770d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor/// template argument deduction. 3771c373d48502ca7683ab55385f5bd624d778eb288dJohn McCallUnresolvedSetIterator 3772c373d48502ca7683ab55385f5bd624d778eb288dJohn McCallSema::getMostSpecialized(UnresolvedSetIterator SpecBegin, 37735c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor UnresolvedSetIterator SpecEnd, 3774c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall TemplatePartialOrderingContext TPOC, 37755c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor unsigned NumCallArguments, 3776c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall SourceLocation Loc, 3777c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall const PartialDiagnostic &NoneDiag, 3778c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall const PartialDiagnostic &AmbigDiag, 37791be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor const PartialDiagnostic &CandidateDiag, 37801be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor bool Complain) { 3781c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall if (SpecBegin == SpecEnd) { 37821be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 37831be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag(Loc, NoneDiag); 3784c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecEnd; 3785d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3786dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3787dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (SpecBegin + 1 == SpecEnd) 3788c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecBegin; 3789dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3790d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Find the function template that is better than all of the templates it 3791d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // has been compared to. 3792c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall UnresolvedSetIterator Best = SpecBegin; 3793dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi FunctionTemplateDecl *BestTemplate 3794c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*Best)->getPrimaryTemplate(); 3795d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor assert(BestTemplate && "Not a function template specialization?"); 3796c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall for (UnresolvedSetIterator I = SpecBegin + 1; I != SpecEnd; ++I) { 3797c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall FunctionTemplateDecl *Challenger 3798c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*I)->getPrimaryTemplate(); 3799d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor assert(Challenger && "Not a function template specialization?"); 3800c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall if (isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, 38015c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Loc, TPOC, NumCallArguments), 3802d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Challenger)) { 3803d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Best = I; 3804d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor BestTemplate = Challenger; 3805d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3806d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3807dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3808d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Make sure that the "best" function template is more specialized than all 3809d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // of the others. 3810d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor bool Ambiguous = false; 3811c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { 3812c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall FunctionTemplateDecl *Challenger 3813c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall = cast<FunctionDecl>(*I)->getPrimaryTemplate(); 3814d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (I != Best && 3815dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi !isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, 38165c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor Loc, TPOC, NumCallArguments), 3817d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor BestTemplate)) { 3818d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor Ambiguous = true; 3819d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor break; 3820d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3821d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3822dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3823d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor if (!Ambiguous) { 3824d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // We found an answer. Return it. 3825c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return Best; 3826d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor } 3827dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3828d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // Diagnose the ambiguity. 38291be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 38301be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag(Loc, AmbigDiag); 3831dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 38321be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor if (Complain) 3833d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor // FIXME: Can we order the candidates in some sane way? 38341be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) 38351be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor Diag((*I)->getLocation(), CandidateDiag) 38361be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor << getTemplateArgumentBindingsText( 38371be8eec3ddd2a23c19b453c2639226174eb5d4a8Douglas Gregor cast<FunctionDecl>(*I)->getPrimaryTemplate()->getTemplateParameters(), 3838c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall *cast<FunctionDecl>(*I)->getTemplateSpecializationArgs()); 3839dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3840c373d48502ca7683ab55385f5bd624d778eb288dJohn McCall return SpecEnd; 3841d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor} 3842d5a423b279e787e9fdd8309fe52cb515388c54eaDouglas Gregor 3843bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \brief Returns the more specialized class template partial specialization 3844bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// according to the rules of partial ordering of class template partial 3845bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// specializations (C++ [temp.class.order]). 3846bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 3847bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \param PS1 the first class template partial specialization 3848bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 3849bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \param PS2 the second class template partial specialization 3850bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// 3851bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// \returns the more specialized class template partial specialization. If 3852bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor/// neither partial specialization is more specialized, returns NULL. 3853bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas GregorClassTemplatePartialSpecializationDecl * 3854bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas GregorSema::getMoreSpecializedPartialSpecialization( 3855bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor ClassTemplatePartialSpecializationDecl *PS1, 38565769d6195087229770d7ac90449443e026c47103John McCall ClassTemplatePartialSpecializationDecl *PS2, 38575769d6195087229770d7ac90449443e026c47103John McCall SourceLocation Loc) { 3858bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // C++ [temp.class.order]p1: 3859bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // For two class template partial specializations, the first is at least as 3860dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // specialized as the second if, given the following rewrite to two 3861dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // function templates, the first function template is at least as 3862dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // specialized as the second according to the ordering rules for function 3863bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // templates (14.6.6.2): 3864bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // - the first function template has the same template parameters as the 3865dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // first partial specialization and has a single function parameter 3866dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // whose type is a class template specialization with the template 3867bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // arguments of the first partial specialization, and 3868bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // - the second function template has the same template parameters as the 3869dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // second partial specialization and has a single function parameter 3870dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // whose type is a class template specialization with the template 3871bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // arguments of the second partial specialization. 3872bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // 387331dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // Rather than synthesize function templates, we merely perform the 387431dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // equivalent partial ordering by performing deduction directly on 387531dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // the template arguments of the class template partial 387631dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // specializations. This computation is slightly simpler than the 387731dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // general problem of function template partial ordering, because 387831dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // class template partial specializations are more constrained. We 387931dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // know that every template parameter is deducible from the class 388031dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // template partial specialization's template arguments, for 388131dce8f606c5ff4a51db67caa24ac3312ccea3f3Douglas Gregor // example. 38825f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<DeducedTemplateArgument, 4> Deduced; 38832a7fb27913999d132cf9e10e03dc5271faa2e9d3John McCall TemplateDeductionInfo Info(Context, Loc); 388431f17ecbef57b5679c017c375db330546b7b5145John McCall 388531f17ecbef57b5679c017c375db330546b7b5145John McCall QualType PT1 = PS1->getInjectedSpecializationType(); 388631f17ecbef57b5679c017c375db330546b7b5145John McCall QualType PT2 = PS2->getInjectedSpecializationType(); 3887dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3888bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // Determine whether PS1 is at least as specialized as PS2 3889bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor Deduced.resize(PS2->getTemplateParameters()->size()); 38905c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool Better1 = !::DeduceTemplateArguments(*this, PS2->getTemplateParameters(), 38915c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PT2, PT1, Info, Deduced, TDF_None, 3892dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi /*PartialOrdering=*/true, 3893b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*RefParamComparisons=*/0); 38942c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis if (Better1) { 38952c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis InstantiatingTemplate Inst(*this, PS2->getLocation(), PS2, 38962c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis Deduced.data(), Deduced.size(), Info); 3897dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Better1 = !::FinishTemplateArgumentDeduction(*this, PS2, 3898dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PS1->getTemplateArgs(), 3899516e6e09821a61e8975c787e189949723249e7c5Douglas Gregor Deduced, Info); 39002c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis } 3901dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3902bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor // Determine whether PS2 is at least as specialized as PS1 3903db0d4b751e83b8841b8f48f913f17e50467f13d4Douglas Gregor Deduced.clear(); 3904bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor Deduced.resize(PS1->getTemplateParameters()->size()); 39055c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor bool Better2 = !::DeduceTemplateArguments(*this, PS1->getTemplateParameters(), 39065c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor PT1, PT2, Info, Deduced, TDF_None, 39075c7bf42ef16dc767615bed10f3b7b3c1265314e1Douglas Gregor /*PartialOrdering=*/true, 3908b939a1987318f802fd25f89e15ae7d2423161cacDouglas Gregor /*RefParamComparisons=*/0); 39092c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis if (Better2) { 39102c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis InstantiatingTemplate Inst(*this, PS1->getLocation(), PS1, 39112c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis Deduced.data(), Deduced.size(), Info); 3912dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi Better2 = !::FinishTemplateArgumentDeduction(*this, PS1, 3913dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi PS2->getTemplateArgs(), 3914516e6e09821a61e8975c787e189949723249e7c5Douglas Gregor Deduced, Info); 39152c4792c731690dbbcbe69dd0625977adffc2961aArgyrios Kyrtzidis } 3916dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3917bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor if (Better1 == Better2) 3918bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor return 0; 3919dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3920bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor return Better1? PS1 : PS2; 3921bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor} 3922bf4ea56cdc376cef5a12abf6bf18dc34805c2226Douglas Gregor 39231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 3924e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 3925e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const TemplateArgument &TemplateArg, 3926e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3927ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 39285f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used); 3929031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3930e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 3931031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// expression. 39321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 3933e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 3934e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const Expr *E, 3935e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3936ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 39375f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 3938be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor // We can deduce from a pack expansion. 3939be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor if (const PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(E)) 3940be230c36e32142cbdcdbe9c97511d097beeecbabDouglas Gregor E = Expansion->getPattern(); 3941dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 394254c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor // Skip through any implicit casts we added while type-checking. 394354c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 394454c53cca105ed595e12fecf04e415c3712bda936Douglas Gregor E = ICE->getSubExpr(); 3945dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3946dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // FIXME: if !OnlyDeduced, we have to walk the whole subexpression to 3947e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // find other occurrences of template parameters. 3948f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E); 3949c781f9cd854f3d5d1c826f4a13382c6abca4cff7Douglas Gregor if (!DRE) 3950031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 3951031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 39521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const NonTypeTemplateParmDecl *NTTP 3953031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor = dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); 3954031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor if (!NTTP) 3955031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 3956031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3957ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (NTTP->getDepth() == Depth) 3958ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[NTTP->getIndex()] = true; 3959031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 3960031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 3961e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 3962e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// nested name specifier. 3963e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregorstatic void 3964e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 3965e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor NestedNameSpecifier *NNS, 3966e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3967ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 39685f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 3969e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!NNS) 3970e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 3971dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3972ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor MarkUsedTemplateParameters(SemaRef, NNS->getPrefix(), OnlyDeduced, Depth, 3973ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used); 3974dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, QualType(NNS->getAsType(), 0), 3975ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 3976e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor} 3977dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3978e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 3979e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// template name. 3980e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregorstatic void 3981e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 3982e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor TemplateName Name, 3983e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 3984ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 39855f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 3986e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (TemplateDecl *Template = Name.getAsTemplateDecl()) { 3987e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (TemplateTemplateParmDecl *TTP 3988ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor = dyn_cast<TemplateTemplateParmDecl>(Template)) { 3989ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (TTP->getDepth() == Depth) 3990ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[TTP->getIndex()] = true; 3991ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor } 3992e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 3993e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor } 3994dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 3995788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor if (QualifiedTemplateName *QTN = Name.getAsQualifiedTemplateName()) 3996dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, QTN->getQualifier(), OnlyDeduced, 3997788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor Depth, Used); 3998e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) 3999dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, DTN->getQualifier(), OnlyDeduced, 4000ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4001e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor} 4002e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor 4003e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by the given 4004031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// type. 40051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 4006e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, QualType T, 4007e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4008ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 40095f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 4010e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (T.isNull()) 4011e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor return; 4012dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4013031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor // Non-dependent types have nothing deducible 4014031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor if (!T->isDependentType()) 4015031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor return; 4016031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4017031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor T = SemaRef.Context.getCanonicalType(T); 4018031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor switch (T->getTypeClass()) { 4019031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Pointer: 4020e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 4021e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<PointerType>(T)->getPointeeType(), 4022e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 4023ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 4024e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 4025031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4026031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4027031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::BlockPointer: 4028e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 4029e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<BlockPointerType>(T)->getPointeeType(), 4030e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 4031ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 4032e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 4033031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4034031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4035031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::LValueReference: 4036031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::RValueReference: 4037e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 4038e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ReferenceType>(T)->getPointeeType(), 4039e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor OnlyDeduced, 4040ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, 4041e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor Used); 4042031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4043031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4044031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::MemberPointer: { 4045031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor const MemberPointerType *MemPtr = cast<MemberPointerType>(T.getTypePtr()); 4046e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, MemPtr->getPointeeType(), OnlyDeduced, 4047ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4048e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, QualType(MemPtr->getClass(), 0), 4049ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4050031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4051031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4052031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4053031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::DependentSizedArray: 4054e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 4055e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<DependentSizedArrayType>(T)->getSizeExpr(), 4056ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4057031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor // Fall through to check the element type 4058031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4059031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ConstantArray: 4060031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::IncompleteArray: 4061e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 4062e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ArrayType>(T)->getElementType(), 4063ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4064031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4065031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4066031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Vector: 4067031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ExtVector: 4068e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 4069e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<VectorType>(T)->getElementType(), 4070ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4071031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4072031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 40739cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor case Type::DependentSizedExtVector: { 40749cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor const DependentSizedExtVectorType *VecType 4075f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor = cast<DependentSizedExtVectorType>(T); 4076e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, VecType->getElementType(), OnlyDeduced, 4077ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4078dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, VecType->getSizeExpr(), OnlyDeduced, 4079ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 40809cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor break; 40819cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor } 40829cdda0cf8528e3d595be9bfa002f0450074beb4dDouglas Gregor 4083031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::FunctionProto: { 4084f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor const FunctionProtoType *Proto = cast<FunctionProtoType>(T); 4085e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, Proto->getResultType(), OnlyDeduced, 4086ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4087031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor for (unsigned I = 0, N = Proto->getNumArgs(); I != N; ++I) 4088e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, Proto->getArgType(I), OnlyDeduced, 4089ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4090031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4091031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4092031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4093ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor case Type::TemplateTypeParm: { 4094ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor const TemplateTypeParmType *TTP = cast<TemplateTypeParmType>(T); 4095ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor if (TTP->getDepth() == Depth) 4096ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used[TTP->getIndex()] = true; 4097031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4098ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor } 4099031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 41000bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor case Type::SubstTemplateTypeParmPack: { 41010bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor const SubstTemplateTypeParmPackType *Subst 41020bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor = cast<SubstTemplateTypeParmPackType>(T); 4103dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, 41040bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor QualType(Subst->getReplacedParameter(), 0), 41050bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor OnlyDeduced, Depth, Used); 41060bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor MarkUsedTemplateParameters(SemaRef, Subst->getArgumentPack(), 41070bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor OnlyDeduced, Depth, Used); 41080bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor break; 41090bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor } 41100bc15d92bf98cd01e7904d7fca9895dacc237618Douglas Gregor 411131f17ecbef57b5679c017c375db330546b7b5145John McCall case Type::InjectedClassName: 411231f17ecbef57b5679c017c375db330546b7b5145John McCall T = cast<InjectedClassNameType>(T)->getInjectedSpecializationType(); 411331f17ecbef57b5679c017c375db330546b7b5145John McCall // fall through 411431f17ecbef57b5679c017c375db330546b7b5145John McCall 4115031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::TemplateSpecialization: { 41161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const TemplateSpecializationType *Spec 4117f6ddb737cb882ffbf0b75a9abd50b930cc2b9068Douglas Gregor = cast<TemplateSpecializationType>(T); 4118e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, Spec->getTemplateName(), OnlyDeduced, 4119ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4120dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 41217b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 4122dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 4123dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 41247b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 4125dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 41267b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) 41277b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor break; 41287b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 4129e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) 4130ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor MarkUsedTemplateParameters(SemaRef, Spec->getArg(I), OnlyDeduced, Depth, 4131ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Used); 4132e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor break; 4133e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor } 41341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4135e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor case Type::Complex: 4136e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!OnlyDeduced) 4137dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, 4138e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor cast<ComplexType>(T)->getElementType(), 4139ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4140e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor break; 4141031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4142b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman case Type::Atomic: 4143b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman if (!OnlyDeduced) 4144b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman MarkUsedTemplateParameters(SemaRef, 4145b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman cast<AtomicType>(T)->getValueType(), 4146b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman OnlyDeduced, Depth, Used); 4147b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman break; 4148b001de7458d17c17e6d8b8034c7cfcefd3b70c00Eli Friedman 41494714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor case Type::DependentName: 4150e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor if (!OnlyDeduced) 4151e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, 41524714c12a1ab759156b78be8f109ea4c12213af57Douglas Gregor cast<DependentNameType>(T)->getQualifier(), 4153ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor OnlyDeduced, Depth, Used); 4154031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4155031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 415633500955d731c73717af52088b7fc0e7a85681e7John McCall case Type::DependentTemplateSpecialization: { 415733500955d731c73717af52088b7fc0e7a85681e7John McCall const DependentTemplateSpecializationType *Spec 415833500955d731c73717af52088b7fc0e7a85681e7John McCall = cast<DependentTemplateSpecializationType>(T); 415933500955d731c73717af52088b7fc0e7a85681e7John McCall if (!OnlyDeduced) 416033500955d731c73717af52088b7fc0e7a85681e7John McCall MarkUsedTemplateParameters(SemaRef, Spec->getQualifier(), 416133500955d731c73717af52088b7fc0e7a85681e7John McCall OnlyDeduced, Depth, Used); 4162dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 41637b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 4164dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 4165dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 41667b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 4167dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 41687b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) 41697b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor break; 41707b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 417133500955d731c73717af52088b7fc0e7a85681e7John McCall for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) 417233500955d731c73717af52088b7fc0e7a85681e7John McCall MarkUsedTemplateParameters(SemaRef, Spec->getArg(I), OnlyDeduced, Depth, 417333500955d731c73717af52088b7fc0e7a85681e7John McCall Used); 417433500955d731c73717af52088b7fc0e7a85681e7John McCall break; 417533500955d731c73717af52088b7fc0e7a85681e7John McCall } 417633500955d731c73717af52088b7fc0e7a85681e7John McCall 4177ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::TypeOf: 4178ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 4179ad5e73887052193afda72db8efcb812bd083a4a8John McCall MarkUsedTemplateParameters(SemaRef, 4180ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<TypeOfType>(T)->getUnderlyingType(), 4181ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 4182ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 4183ad5e73887052193afda72db8efcb812bd083a4a8John McCall 4184ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::TypeOfExpr: 4185ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 4186ad5e73887052193afda72db8efcb812bd083a4a8John McCall MarkUsedTemplateParameters(SemaRef, 4187ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<TypeOfExprType>(T)->getUnderlyingExpr(), 4188ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 4189ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 4190ad5e73887052193afda72db8efcb812bd083a4a8John McCall 4191ad5e73887052193afda72db8efcb812bd083a4a8John McCall case Type::Decltype: 4192ad5e73887052193afda72db8efcb812bd083a4a8John McCall if (!OnlyDeduced) 4193ad5e73887052193afda72db8efcb812bd083a4a8John McCall MarkUsedTemplateParameters(SemaRef, 4194ad5e73887052193afda72db8efcb812bd083a4a8John McCall cast<DecltypeType>(T)->getUnderlyingExpr(), 4195ad5e73887052193afda72db8efcb812bd083a4a8John McCall OnlyDeduced, Depth, Used); 4196ad5e73887052193afda72db8efcb812bd083a4a8John McCall break; 4197ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt 4198ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt case Type::UnaryTransform: 4199ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt if (!OnlyDeduced) 4200ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt MarkUsedTemplateParameters(SemaRef, 4201ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt cast<UnaryTransformType>(T)->getUnderlyingType(), 4202ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt OnlyDeduced, Depth, Used); 4203ca63c200346c0ca9e00194ec6e34a5a7b0ed9321Sean Hunt break; 4204ad5e73887052193afda72db8efcb812bd083a4a8John McCall 42057536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor case Type::PackExpansion: 4206dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, 42077536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor cast<PackExpansionType>(T)->getPattern(), 42087536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor OnlyDeduced, Depth, Used); 42097536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor break; 42107536dd5e6c99584481b7dab68b7e7d8df9c54054Douglas Gregor 421134b41d939a1328f484511c6002ba2456db879a29Richard Smith case Type::Auto: 421234b41d939a1328f484511c6002ba2456db879a29Richard Smith MarkUsedTemplateParameters(SemaRef, 421334b41d939a1328f484511c6002ba2456db879a29Richard Smith cast<AutoType>(T)->getDeducedType(), 421434b41d939a1328f484511c6002ba2456db879a29Richard Smith OnlyDeduced, Depth, Used); 421534b41d939a1328f484511c6002ba2456db879a29Richard Smith 4216e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor // None of these types have any template parameters in them. 4217031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Builtin: 4218031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::VariableArray: 4219031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::FunctionNoProto: 4220031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Record: 4221031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::Enum: 4222031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case Type::ObjCInterface: 4223c12c5bba6ceb6acd4e51e7a0fc03257da9cfd44eJohn McCall case Type::ObjCObject: 4224d1b3c2dd5bc1f3103bee6137957aa7c5f8f2f0bcSteve Naroff case Type::ObjCObjectPointer: 4225ed97649e9574b9d854fa4d6109c9333ae0993554John McCall case Type::UnresolvedUsing: 4226031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define TYPE(Class, Base) 4227031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define ABSTRACT_TYPE(Class, Base) 4228031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define DEPENDENT_TYPE(Class, Base) 4229031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 4230031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor#include "clang/AST/TypeNodes.def" 4231031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4232031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4233031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 4234031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4235e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor/// \brief Mark the template parameters that are used by this 4236031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// template argument. 42371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpstatic void 4238e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorMarkUsedTemplateParameters(Sema &SemaRef, 4239e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor const TemplateArgument &TemplateArg, 4240e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor bool OnlyDeduced, 4241ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor unsigned Depth, 42425f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 4243031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor switch (TemplateArg.getKind()) { 4244031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Null: 4245031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Integral: 4246788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Declaration: 4247031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 42481eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4249031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Type: 4250e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor MarkUsedTemplateParameters(SemaRef, TemplateArg.getAsType(), OnlyDeduced, 4251ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4252031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4253031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4254788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor case TemplateArgument::Template: 4255a7fc901a2e39bfe55bfcff5934b2d9fdf9656491Douglas Gregor case TemplateArgument::TemplateExpansion: 4256dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, 4257dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateArg.getAsTemplateOrTemplatePattern(), 4258788cd06cf8e868a67158aafec5de3a1f408d14f3Douglas Gregor OnlyDeduced, Depth, Used); 4259031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4260031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4261031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor case TemplateArgument::Expression: 4262dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi MarkUsedTemplateParameters(SemaRef, TemplateArg.getAsExpr(), OnlyDeduced, 4263ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4264031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor break; 4265dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 4266d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson case TemplateArgument::Pack: 4267e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor for (TemplateArgument::pack_iterator P = TemplateArg.pack_begin(), 4268e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor PEnd = TemplateArg.pack_end(); 4269e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas Gregor P != PEnd; ++P) 4270ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor MarkUsedTemplateParameters(SemaRef, *P, OnlyDeduced, Depth, Used); 4271d01b1da213aeb71fd40ff7fb78a194613cc1ece7Anders Carlsson break; 4272031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor } 4273031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 4274031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor 4275031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \brief Mark the template parameters can be deduced by the given 4276031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// template argument list. 4277031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// 4278031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \param TemplateArgs the template argument list from which template 4279031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// parameters will be deduced. 4280031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// 4281031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// \param Deduced a bit vector whose elements will be set to \c true 4282031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// to indicate when the corresponding template parameter will be 4283031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor/// deduced. 42841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid 4285e73bb60de3c7c60453a86e097fc428d1cd367a42Douglas GregorSema::MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs, 4286ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor bool OnlyDeduced, unsigned Depth, 42875f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Used) { 42887b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // C++0x [temp.deduct.type]p9: 4289dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // If the template argument list of P contains a pack expansion that is not 4290dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi // the last template argument, the entire template argument list is a 42917b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor // non-deduced context. 4292dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi if (OnlyDeduced && 42937b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor hasPackExpansionBeforeEnd(TemplateArgs.data(), TemplateArgs.size())) 42947b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor return; 42957b976ece336d209977b25b5c28ee09c2d2146e6aDouglas Gregor 4296031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) 4297dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi ::MarkUsedTemplateParameters(*this, TemplateArgs[I], OnlyDeduced, 4298ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor Depth, Used); 4299031a5880e19d06624551aed9d74594356f4f9db1Douglas Gregor} 430063f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor 430163f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor/// \brief Marks all of the template parameters that will be deduced by a 430263f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor/// call to the given function template. 4303dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumivoid 430402024a9f0d8e6c898de276193af604c42ee41269Douglas GregorSema::MarkDeducedTemplateParameters(FunctionTemplateDecl *FunctionTemplate, 43055f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVectorImpl<bool> &Deduced) { 4306dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi TemplateParameterList *TemplateParams 430763f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor = FunctionTemplate->getTemplateParameters(); 430863f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor Deduced.clear(); 430963f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor Deduced.resize(TemplateParams->size()); 4310dfbb02a16ac8c764b5ba1742450513d6212d2f9fNAKAMURA Takumi 431163f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); 431263f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) 431363f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor ::MarkUsedTemplateParameters(*this, Function->getParamDecl(I)->getType(), 4314ed9c0f90b7e0811c209b95e39fe07c211c531285Douglas Gregor true, TemplateParams->getDepth(), Deduced); 431563f07c55d58951574afe9bbb9f7cb3f92eecdd9bDouglas Gregor} 4316dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4317dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregorbool hasDeducibleTemplateParameters(Sema &S, 4318dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor FunctionTemplateDecl *FunctionTemplate, 4319dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor QualType T) { 4320dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (!T->isDependentType()) 4321dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor return false; 4322dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4323dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor TemplateParameterList *TemplateParams 4324dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor = FunctionTemplate->getTemplateParameters(); 43255f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner SmallVector<bool, 4> Deduced; 4326dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor Deduced.resize(TemplateParams->size()); 4327dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor ::MarkUsedTemplateParameters(S, T, true, TemplateParams->getDepth(), 4328dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor Deduced); 4329dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4330dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor for (unsigned I = 0, N = Deduced.size(); I != N; ++I) 4331dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor if (Deduced[I]) 4332dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor return true; 4333dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor 4334dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor return false; 4335dbfb371e297794e827ad2e5b33b45fafbfc46b29Douglas Gregor} 4336