Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1 | //===------- SemaTemplateDeduction.cpp - Template Argument Deduction ------===/ |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | //===----------------------------------------------------------------------===/ |
| 8 | // |
| 9 | // This file implements C++ template argument deduction. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===/ |
| 12 | |
Douglas Gregor | e737f50 | 2010-08-12 20:07:10 +0000 | [diff] [blame] | 13 | #include "clang/Sema/Sema.h" |
John McCall | 1951085 | 2010-08-20 18:27:03 +0000 | [diff] [blame] | 14 | #include "clang/Sema/DeclSpec.h" |
John McCall | 7cd088e | 2010-08-24 07:21:54 +0000 | [diff] [blame] | 15 | #include "clang/Sema/Template.h" |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 16 | #include "clang/Sema/TemplateDeduction.h" |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 17 | #include "clang/AST/ASTContext.h" |
John McCall | 7cd088e | 2010-08-24 07:21:54 +0000 | [diff] [blame] | 18 | #include "clang/AST/DeclObjC.h" |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 19 | #include "clang/AST/DeclTemplate.h" |
| 20 | #include "clang/AST/StmtVisitor.h" |
| 21 | #include "clang/AST/Expr.h" |
| 22 | #include "clang/AST/ExprCXX.h" |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 23 | #include "llvm/ADT/BitVector.h" |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 24 | #include "TreeTransform.h" |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 25 | #include <algorithm> |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 26 | |
| 27 | namespace clang { |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 28 | using namespace sema; |
| 29 | |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 30 | /// \brief Various flags that control template argument deduction. |
| 31 | /// |
| 32 | /// These flags can be bitwise-OR'd together. |
| 33 | enum TemplateDeductionFlags { |
| 34 | /// \brief No template argument deduction flags, which indicates the |
| 35 | /// strictest results for template argument deduction (as used for, e.g., |
| 36 | /// matching class template partial specializations). |
| 37 | TDF_None = 0, |
| 38 | /// \brief Within template argument deduction from a function call, we are |
| 39 | /// matching with a parameter type for which the original parameter was |
| 40 | /// a reference. |
| 41 | TDF_ParamWithReferenceType = 0x1, |
| 42 | /// \brief Within template argument deduction from a function call, we |
| 43 | /// are matching in a case where we ignore cv-qualifiers. |
| 44 | TDF_IgnoreQualifiers = 0x02, |
| 45 | /// \brief Within template argument deduction from a function call, |
| 46 | /// we are matching in a case where we can perform template argument |
Douglas Gregor | 4112877 | 2009-06-26 23:27:24 +0000 | [diff] [blame] | 47 | /// deduction from a template-id of a derived class of the argument type. |
Douglas Gregor | 1282029 | 2009-09-14 20:00:47 +0000 | [diff] [blame] | 48 | TDF_DerivedClass = 0x04, |
| 49 | /// \brief Allow non-dependent types to differ, e.g., when performing |
| 50 | /// template argument deduction from a function call where conversions |
| 51 | /// may apply. |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 52 | TDF_SkipNonDependent = 0x08, |
| 53 | /// \brief Whether we are performing template argument deduction for |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 54 | /// parameters and arguments in a top-level template argument |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 55 | TDF_TopLevelParameterTypeList = 0x10 |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 56 | }; |
| 57 | } |
| 58 | |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 59 | using namespace clang; |
| 60 | |
Douglas Gregor | 9d0e441 | 2010-03-26 05:50:28 +0000 | [diff] [blame] | 61 | /// \brief Compare two APSInts, extending and switching the sign as |
| 62 | /// necessary to compare their values regardless of underlying type. |
| 63 | static bool hasSameExtendedValue(llvm::APSInt X, llvm::APSInt Y) { |
| 64 | if (Y.getBitWidth() > X.getBitWidth()) |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 65 | X = X.extend(Y.getBitWidth()); |
Douglas Gregor | 9d0e441 | 2010-03-26 05:50:28 +0000 | [diff] [blame] | 66 | else if (Y.getBitWidth() < X.getBitWidth()) |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 67 | Y = Y.extend(X.getBitWidth()); |
Douglas Gregor | 9d0e441 | 2010-03-26 05:50:28 +0000 | [diff] [blame] | 68 | |
| 69 | // If there is a signedness mismatch, correct it. |
| 70 | if (X.isSigned() != Y.isSigned()) { |
| 71 | // If the signed value is negative, then the values cannot be the same. |
| 72 | if ((Y.isSigned() && Y.isNegative()) || (X.isSigned() && X.isNegative())) |
| 73 | return false; |
| 74 | |
| 75 | Y.setIsSigned(true); |
| 76 | X.setIsSigned(true); |
| 77 | } |
| 78 | |
| 79 | return X == Y; |
| 80 | } |
| 81 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 82 | static Sema::TemplateDeductionResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 83 | DeduceTemplateArguments(Sema &S, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 84 | TemplateParameterList *TemplateParams, |
| 85 | const TemplateArgument &Param, |
Douglas Gregor | 77d6bb9 | 2011-01-11 22:21:24 +0000 | [diff] [blame] | 86 | TemplateArgument Arg, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 87 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 88 | SmallVectorImpl<DeducedTemplateArgument> &Deduced); |
Douglas Gregor | d708c72 | 2009-06-09 16:35:58 +0000 | [diff] [blame] | 89 | |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 90 | /// \brief Whether template argument deduction for two reference parameters |
| 91 | /// resulted in the argument type, parameter type, or neither type being more |
| 92 | /// qualified than the other. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 93 | enum DeductionQualifierComparison { |
| 94 | NeitherMoreQualified = 0, |
| 95 | ParamMoreQualified, |
| 96 | ArgMoreQualified |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 97 | }; |
| 98 | |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 99 | /// \brief Stores the result of comparing two reference parameters while |
| 100 | /// performing template argument deduction for partial ordering of function |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 101 | /// templates. |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 102 | struct RefParamPartialOrderingComparison { |
| 103 | /// \brief Whether the parameter type is an rvalue reference type. |
| 104 | bool ParamIsRvalueRef; |
| 105 | /// \brief Whether the argument type is an rvalue reference type. |
| 106 | bool ArgIsRvalueRef; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 107 | |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 108 | /// \brief Whether the parameter or argument (or neither) is more qualified. |
| 109 | DeductionQualifierComparison Qualifiers; |
| 110 | }; |
| 111 | |
| 112 | |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 113 | |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 114 | static Sema::TemplateDeductionResult |
| 115 | DeduceTemplateArguments(Sema &S, |
| 116 | TemplateParameterList *TemplateParams, |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 117 | QualType Param, |
| 118 | QualType Arg, |
| 119 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 120 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 121 | unsigned TDF, |
| 122 | bool PartialOrdering = false, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 123 | SmallVectorImpl<RefParamPartialOrderingComparison> * |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 124 | RefParamComparisons = 0); |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 125 | |
| 126 | static Sema::TemplateDeductionResult |
| 127 | DeduceTemplateArguments(Sema &S, |
| 128 | TemplateParameterList *TemplateParams, |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 129 | const TemplateArgument *Params, unsigned NumParams, |
| 130 | const TemplateArgument *Args, unsigned NumArgs, |
| 131 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 132 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
Douglas Gregor | 0972c86 | 2010-12-22 18:55:49 +0000 | [diff] [blame] | 133 | bool NumberOfArgumentsMustMatch = true); |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 134 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 135 | /// \brief If the given expression is of a form that permits the deduction |
| 136 | /// of a non-type template parameter, return the declaration of that |
| 137 | /// non-type template parameter. |
| 138 | static NonTypeTemplateParmDecl *getDeducedParameterFromExpr(Expr *E) { |
| 139 | if (ImplicitCastExpr *IC = dyn_cast<ImplicitCastExpr>(E)) |
| 140 | E = IC->getSubExpr(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 141 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 142 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) |
| 143 | return dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 144 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 145 | return 0; |
| 146 | } |
| 147 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 148 | /// \brief Determine whether two declaration pointers refer to the same |
| 149 | /// declaration. |
| 150 | static bool isSameDeclaration(Decl *X, Decl *Y) { |
| 151 | if (!X || !Y) |
| 152 | return !X && !Y; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 153 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 154 | if (NamedDecl *NX = dyn_cast<NamedDecl>(X)) |
| 155 | X = NX->getUnderlyingDecl(); |
| 156 | if (NamedDecl *NY = dyn_cast<NamedDecl>(Y)) |
| 157 | Y = NY->getUnderlyingDecl(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 158 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 159 | return X->getCanonicalDecl() == Y->getCanonicalDecl(); |
| 160 | } |
| 161 | |
| 162 | /// \brief Verify that the given, deduced template arguments are compatible. |
| 163 | /// |
| 164 | /// \returns The deduced template argument, or a NULL template argument if |
| 165 | /// the deduced template arguments were incompatible. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 166 | static DeducedTemplateArgument |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 167 | checkDeducedTemplateArguments(ASTContext &Context, |
| 168 | const DeducedTemplateArgument &X, |
| 169 | const DeducedTemplateArgument &Y) { |
| 170 | // We have no deduction for one or both of the arguments; they're compatible. |
| 171 | if (X.isNull()) |
| 172 | return Y; |
| 173 | if (Y.isNull()) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 174 | return X; |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 175 | |
| 176 | switch (X.getKind()) { |
| 177 | case TemplateArgument::Null: |
| 178 | llvm_unreachable("Non-deduced template arguments handled above"); |
| 179 | |
| 180 | case TemplateArgument::Type: |
| 181 | // If two template type arguments have the same type, they're compatible. |
| 182 | if (Y.getKind() == TemplateArgument::Type && |
| 183 | Context.hasSameType(X.getAsType(), Y.getAsType())) |
| 184 | return X; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 185 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 186 | return DeducedTemplateArgument(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 187 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 188 | case TemplateArgument::Integral: |
| 189 | // If we deduced a constant in one case and either a dependent expression or |
| 190 | // declaration in another case, keep the integral constant. |
| 191 | // If both are integral constants with the same value, keep that value. |
| 192 | if (Y.getKind() == TemplateArgument::Expression || |
| 193 | Y.getKind() == TemplateArgument::Declaration || |
| 194 | (Y.getKind() == TemplateArgument::Integral && |
| 195 | hasSameExtendedValue(*X.getAsIntegral(), *Y.getAsIntegral()))) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 196 | return DeducedTemplateArgument(X, |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 197 | X.wasDeducedFromArrayBound() && |
| 198 | Y.wasDeducedFromArrayBound()); |
| 199 | |
| 200 | // All other combinations are incompatible. |
| 201 | return DeducedTemplateArgument(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 202 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 203 | case TemplateArgument::Template: |
| 204 | if (Y.getKind() == TemplateArgument::Template && |
| 205 | Context.hasSameTemplateName(X.getAsTemplate(), Y.getAsTemplate())) |
| 206 | return X; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 207 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 208 | // All other combinations are incompatible. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 209 | return DeducedTemplateArgument(); |
Douglas Gregor | a7fc901 | 2011-01-05 18:58:31 +0000 | [diff] [blame] | 210 | |
| 211 | case TemplateArgument::TemplateExpansion: |
| 212 | if (Y.getKind() == TemplateArgument::TemplateExpansion && |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 213 | Context.hasSameTemplateName(X.getAsTemplateOrTemplatePattern(), |
Douglas Gregor | a7fc901 | 2011-01-05 18:58:31 +0000 | [diff] [blame] | 214 | Y.getAsTemplateOrTemplatePattern())) |
| 215 | return X; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 216 | |
Douglas Gregor | a7fc901 | 2011-01-05 18:58:31 +0000 | [diff] [blame] | 217 | // All other combinations are incompatible. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 218 | return DeducedTemplateArgument(); |
Douglas Gregor | a7fc901 | 2011-01-05 18:58:31 +0000 | [diff] [blame] | 219 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 220 | case TemplateArgument::Expression: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 221 | // If we deduced a dependent expression in one case and either an integral |
| 222 | // constant or a declaration in another case, keep the integral constant |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 223 | // or declaration. |
| 224 | if (Y.getKind() == TemplateArgument::Integral || |
| 225 | Y.getKind() == TemplateArgument::Declaration) |
| 226 | return DeducedTemplateArgument(Y, X.wasDeducedFromArrayBound() && |
| 227 | Y.wasDeducedFromArrayBound()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 228 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 229 | if (Y.getKind() == TemplateArgument::Expression) { |
| 230 | // Compare the expressions for equality |
| 231 | llvm::FoldingSetNodeID ID1, ID2; |
| 232 | X.getAsExpr()->Profile(ID1, Context, true); |
| 233 | Y.getAsExpr()->Profile(ID2, Context, true); |
| 234 | if (ID1 == ID2) |
| 235 | return X; |
| 236 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 237 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 238 | // All other combinations are incompatible. |
| 239 | return DeducedTemplateArgument(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 240 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 241 | case TemplateArgument::Declaration: |
| 242 | // If we deduced a declaration and a dependent expression, keep the |
| 243 | // declaration. |
| 244 | if (Y.getKind() == TemplateArgument::Expression) |
| 245 | return X; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 246 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 247 | // If we deduced a declaration and an integral constant, keep the |
| 248 | // integral constant. |
| 249 | if (Y.getKind() == TemplateArgument::Integral) |
| 250 | return Y; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 251 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 252 | // If we deduced two declarations, make sure they they refer to the |
| 253 | // same declaration. |
| 254 | if (Y.getKind() == TemplateArgument::Declaration && |
| 255 | isSameDeclaration(X.getAsDecl(), Y.getAsDecl())) |
| 256 | return X; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 257 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 258 | // All other combinations are incompatible. |
| 259 | return DeducedTemplateArgument(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 260 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 261 | case TemplateArgument::Pack: |
| 262 | if (Y.getKind() != TemplateArgument::Pack || |
| 263 | X.pack_size() != Y.pack_size()) |
| 264 | return DeducedTemplateArgument(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 265 | |
| 266 | for (TemplateArgument::pack_iterator XA = X.pack_begin(), |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 267 | XAEnd = X.pack_end(), |
| 268 | YA = Y.pack_begin(); |
| 269 | XA != XAEnd; ++XA, ++YA) { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 270 | if (checkDeducedTemplateArguments(Context, |
| 271 | DeducedTemplateArgument(*XA, X.wasDeducedFromArrayBound()), |
Douglas Gregor | 135ffa7 | 2011-01-05 21:00:53 +0000 | [diff] [blame] | 272 | DeducedTemplateArgument(*YA, Y.wasDeducedFromArrayBound())) |
| 273 | .isNull()) |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 274 | return DeducedTemplateArgument(); |
| 275 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 276 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 277 | return X; |
| 278 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 279 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 280 | return DeducedTemplateArgument(); |
| 281 | } |
| 282 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 283 | /// \brief Deduce the value of the given non-type template parameter |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 284 | /// from the given constant. |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 285 | static Sema::TemplateDeductionResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 286 | DeduceNonTypeTemplateArgument(Sema &S, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 287 | NonTypeTemplateParmDecl *NTTP, |
Douglas Gregor | 9d0e441 | 2010-03-26 05:50:28 +0000 | [diff] [blame] | 288 | llvm::APSInt Value, QualType ValueType, |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 289 | bool DeducedFromArrayBound, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 290 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 291 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 292 | assert(NTTP->getDepth() == 0 && |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 293 | "Cannot deduce non-type template argument with depth > 0"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 294 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 295 | DeducedTemplateArgument NewDeduced(Value, ValueType, DeducedFromArrayBound); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 296 | DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 297 | Deduced[NTTP->getIndex()], |
| 298 | NewDeduced); |
| 299 | if (Result.isNull()) { |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 300 | Info.Param = NTTP; |
| 301 | Info.FirstArg = Deduced[NTTP->getIndex()]; |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 302 | Info.SecondArg = NewDeduced; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 303 | return Sema::TDK_Inconsistent; |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 304 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 305 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 306 | Deduced[NTTP->getIndex()] = Result; |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 307 | return Sema::TDK_Success; |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 308 | } |
| 309 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 310 | /// \brief Deduce the value of the given non-type template parameter |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 311 | /// from the given type- or value-dependent expression. |
| 312 | /// |
| 313 | /// \returns true if deduction succeeded, false otherwise. |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 314 | static Sema::TemplateDeductionResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 315 | DeduceNonTypeTemplateArgument(Sema &S, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 316 | NonTypeTemplateParmDecl *NTTP, |
| 317 | Expr *Value, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 318 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 319 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 320 | assert(NTTP->getDepth() == 0 && |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 321 | "Cannot deduce non-type template argument with depth > 0"); |
| 322 | assert((Value->isTypeDependent() || Value->isValueDependent()) && |
| 323 | "Expression template argument must be type- or value-dependent."); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 324 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 325 | DeducedTemplateArgument NewDeduced(Value); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 326 | DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, |
| 327 | Deduced[NTTP->getIndex()], |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 328 | NewDeduced); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 329 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 330 | if (Result.isNull()) { |
| 331 | Info.Param = NTTP; |
| 332 | Info.FirstArg = Deduced[NTTP->getIndex()]; |
| 333 | Info.SecondArg = NewDeduced; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 334 | return Sema::TDK_Inconsistent; |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 335 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 336 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 337 | Deduced[NTTP->getIndex()] = Result; |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 338 | return Sema::TDK_Success; |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 339 | } |
| 340 | |
Douglas Gregor | 15755cb | 2009-11-13 23:45:44 +0000 | [diff] [blame] | 341 | /// \brief Deduce the value of the given non-type template parameter |
| 342 | /// from the given declaration. |
| 343 | /// |
| 344 | /// \returns true if deduction succeeded, false otherwise. |
| 345 | static Sema::TemplateDeductionResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 346 | DeduceNonTypeTemplateArgument(Sema &S, |
Douglas Gregor | 15755cb | 2009-11-13 23:45:44 +0000 | [diff] [blame] | 347 | NonTypeTemplateParmDecl *NTTP, |
| 348 | Decl *D, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 349 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 350 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { |
Douglas Gregor | 15755cb | 2009-11-13 23:45:44 +0000 | [diff] [blame] | 351 | assert(NTTP->getDepth() == 0 && |
| 352 | "Cannot deduce non-type template argument with depth > 0"); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 353 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 354 | DeducedTemplateArgument NewDeduced(D? D->getCanonicalDecl() : 0); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 355 | DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 356 | Deduced[NTTP->getIndex()], |
| 357 | NewDeduced); |
| 358 | if (Result.isNull()) { |
| 359 | Info.Param = NTTP; |
| 360 | Info.FirstArg = Deduced[NTTP->getIndex()]; |
| 361 | Info.SecondArg = NewDeduced; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 362 | return Sema::TDK_Inconsistent; |
Douglas Gregor | 15755cb | 2009-11-13 23:45:44 +0000 | [diff] [blame] | 363 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 364 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 365 | Deduced[NTTP->getIndex()] = Result; |
Douglas Gregor | 15755cb | 2009-11-13 23:45:44 +0000 | [diff] [blame] | 366 | return Sema::TDK_Success; |
| 367 | } |
| 368 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 369 | static Sema::TemplateDeductionResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 370 | DeduceTemplateArguments(Sema &S, |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 371 | TemplateParameterList *TemplateParams, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 372 | TemplateName Param, |
| 373 | TemplateName Arg, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 374 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 375 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { |
Douglas Gregor | d708c72 | 2009-06-09 16:35:58 +0000 | [diff] [blame] | 376 | TemplateDecl *ParamDecl = Param.getAsTemplateDecl(); |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 377 | if (!ParamDecl) { |
| 378 | // The parameter type is dependent and is not a template template parameter, |
| 379 | // so there is nothing that we can deduce. |
| 380 | return Sema::TDK_Success; |
| 381 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 382 | |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 383 | if (TemplateTemplateParmDecl *TempParam |
| 384 | = dyn_cast<TemplateTemplateParmDecl>(ParamDecl)) { |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 385 | DeducedTemplateArgument NewDeduced(S.Context.getCanonicalTemplateName(Arg)); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 386 | DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 387 | Deduced[TempParam->getIndex()], |
| 388 | NewDeduced); |
| 389 | if (Result.isNull()) { |
| 390 | Info.Param = TempParam; |
| 391 | Info.FirstArg = Deduced[TempParam->getIndex()]; |
| 392 | Info.SecondArg = NewDeduced; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 393 | return Sema::TDK_Inconsistent; |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 394 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 395 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 396 | Deduced[TempParam->getIndex()] = Result; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 397 | return Sema::TDK_Success; |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 398 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 399 | |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 400 | // Verify that the two template names are equivalent. |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 401 | if (S.Context.hasSameTemplateName(Param, Arg)) |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 402 | return Sema::TDK_Success; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 403 | |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 404 | // Mismatch of non-dependent template parameter to argument. |
| 405 | Info.FirstArg = TemplateArgument(Param); |
| 406 | Info.SecondArg = TemplateArgument(Arg); |
| 407 | return Sema::TDK_NonDeducedMismatch; |
Douglas Gregor | d708c72 | 2009-06-09 16:35:58 +0000 | [diff] [blame] | 408 | } |
| 409 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 410 | /// \brief Deduce the template arguments by comparing the template parameter |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 411 | /// type (which is a template-id) with the template argument type. |
| 412 | /// |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 413 | /// \param S the Sema |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 414 | /// |
| 415 | /// \param TemplateParams the template parameters that we are deducing |
| 416 | /// |
| 417 | /// \param Param the parameter type |
| 418 | /// |
| 419 | /// \param Arg the argument type |
| 420 | /// |
| 421 | /// \param Info information about the template argument deduction itself |
| 422 | /// |
| 423 | /// \param Deduced the deduced template arguments |
| 424 | /// |
| 425 | /// \returns the result of template argument deduction so far. Note that a |
| 426 | /// "success" result means that template argument deduction has not yet failed, |
| 427 | /// but it may still fail, later, for other reasons. |
| 428 | static Sema::TemplateDeductionResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 429 | DeduceTemplateArguments(Sema &S, |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 430 | TemplateParameterList *TemplateParams, |
| 431 | const TemplateSpecializationType *Param, |
| 432 | QualType Arg, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 433 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 434 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { |
John McCall | 467b27b | 2009-10-22 20:10:53 +0000 | [diff] [blame] | 435 | assert(Arg.isCanonical() && "Argument type must be canonical"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 436 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 437 | // Check whether the template argument is a dependent template-id. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 438 | if (const TemplateSpecializationType *SpecArg |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 439 | = dyn_cast<TemplateSpecializationType>(Arg)) { |
| 440 | // Perform template argument deduction for the template name. |
| 441 | if (Sema::TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 442 | = DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 443 | Param->getTemplateName(), |
| 444 | SpecArg->getTemplateName(), |
| 445 | Info, Deduced)) |
| 446 | return Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 447 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 448 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 449 | // Perform template argument deduction on each template |
Douglas Gregor | 0972c86 | 2010-12-22 18:55:49 +0000 | [diff] [blame] | 450 | // argument. Ignore any missing/extra arguments, since they could be |
| 451 | // filled in by default arguments. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 452 | return DeduceTemplateArguments(S, TemplateParams, |
| 453 | Param->getArgs(), Param->getNumArgs(), |
Douglas Gregor | 0972c86 | 2010-12-22 18:55:49 +0000 | [diff] [blame] | 454 | SpecArg->getArgs(), SpecArg->getNumArgs(), |
| 455 | Info, Deduced, |
| 456 | /*NumberOfArgumentsMustMatch=*/false); |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 457 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 458 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 459 | // If the argument type is a class template specialization, we |
| 460 | // perform template argument deduction using its template |
| 461 | // arguments. |
| 462 | const RecordType *RecordArg = dyn_cast<RecordType>(Arg); |
| 463 | if (!RecordArg) |
| 464 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 465 | |
| 466 | ClassTemplateSpecializationDecl *SpecArg |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 467 | = dyn_cast<ClassTemplateSpecializationDecl>(RecordArg->getDecl()); |
| 468 | if (!SpecArg) |
| 469 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 470 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 471 | // Perform template argument deduction for the template name. |
| 472 | if (Sema::TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 473 | = DeduceTemplateArguments(S, |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 474 | TemplateParams, |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 475 | Param->getTemplateName(), |
| 476 | TemplateName(SpecArg->getSpecializedTemplate()), |
| 477 | Info, Deduced)) |
| 478 | return Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 479 | |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 480 | // Perform template argument deduction for the template arguments. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 481 | return DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 482 | Param->getArgs(), Param->getNumArgs(), |
| 483 | SpecArg->getTemplateArgs().data(), |
| 484 | SpecArg->getTemplateArgs().size(), |
| 485 | Info, Deduced); |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 486 | } |
| 487 | |
John McCall | cd05e81 | 2010-08-28 22:14:41 +0000 | [diff] [blame] | 488 | /// \brief Determines whether the given type is an opaque type that |
| 489 | /// might be more qualified when instantiated. |
| 490 | static bool IsPossiblyOpaquelyQualifiedType(QualType T) { |
| 491 | switch (T->getTypeClass()) { |
| 492 | case Type::TypeOfExpr: |
| 493 | case Type::TypeOf: |
| 494 | case Type::DependentName: |
| 495 | case Type::Decltype: |
| 496 | case Type::UnresolvedUsing: |
John McCall | 62c28c8 | 2011-01-18 07:41:22 +0000 | [diff] [blame] | 497 | case Type::TemplateTypeParm: |
John McCall | cd05e81 | 2010-08-28 22:14:41 +0000 | [diff] [blame] | 498 | return true; |
| 499 | |
| 500 | case Type::ConstantArray: |
| 501 | case Type::IncompleteArray: |
| 502 | case Type::VariableArray: |
| 503 | case Type::DependentSizedArray: |
| 504 | return IsPossiblyOpaquelyQualifiedType( |
| 505 | cast<ArrayType>(T)->getElementType()); |
| 506 | |
| 507 | default: |
| 508 | return false; |
| 509 | } |
| 510 | } |
| 511 | |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 512 | /// \brief Retrieve the depth and index of a template parameter. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 513 | static std::pair<unsigned, unsigned> |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 514 | getDepthAndIndex(NamedDecl *ND) { |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 515 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(ND)) |
| 516 | return std::make_pair(TTP->getDepth(), TTP->getIndex()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 517 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 518 | if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(ND)) |
| 519 | return std::make_pair(NTTP->getDepth(), NTTP->getIndex()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 520 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 521 | TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(ND); |
| 522 | return std::make_pair(TTP->getDepth(), TTP->getIndex()); |
| 523 | } |
| 524 | |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 525 | /// \brief Retrieve the depth and index of an unexpanded parameter pack. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 526 | static std::pair<unsigned, unsigned> |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 527 | getDepthAndIndex(UnexpandedParameterPack UPP) { |
| 528 | if (const TemplateTypeParmType *TTP |
| 529 | = UPP.first.dyn_cast<const TemplateTypeParmType *>()) |
| 530 | return std::make_pair(TTP->getDepth(), TTP->getIndex()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 531 | |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 532 | return getDepthAndIndex(UPP.first.get<NamedDecl *>()); |
| 533 | } |
| 534 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 535 | /// \brief Helper function to build a TemplateParameter when we don't |
| 536 | /// know its type statically. |
| 537 | static TemplateParameter makeTemplateParameter(Decl *D) { |
| 538 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(D)) |
| 539 | return TemplateParameter(TTP); |
| 540 | else if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) |
| 541 | return TemplateParameter(NTTP); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 542 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 543 | return TemplateParameter(cast<TemplateTemplateParmDecl>(D)); |
| 544 | } |
| 545 | |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 546 | /// \brief Prepare to perform template argument deduction for all of the |
| 547 | /// arguments in a set of argument packs. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 548 | static void PrepareArgumentPackDeduction(Sema &S, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 549 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
| 550 | const SmallVectorImpl<unsigned> &PackIndices, |
| 551 | SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, |
| 552 | SmallVectorImpl< |
| 553 | SmallVector<DeducedTemplateArgument, 4> > &NewlyDeducedPacks) { |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 554 | // Save the deduced template arguments for each parameter pack expanded |
| 555 | // by this pack expansion, then clear out the deduction. |
| 556 | for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { |
| 557 | // Save the previously-deduced argument pack, then clear it out so that we |
| 558 | // can deduce a new argument pack. |
| 559 | SavedPacks[I] = Deduced[PackIndices[I]]; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 560 | Deduced[PackIndices[I]] = TemplateArgument(); |
| 561 | |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 562 | // If the template arugment pack was explicitly specified, add that to |
| 563 | // the set of deduced arguments. |
| 564 | const TemplateArgument *ExplicitArgs; |
| 565 | unsigned NumExplicitArgs; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 566 | if (NamedDecl *PartiallySubstitutedPack |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 567 | = S.CurrentInstantiationScope->getPartiallySubstitutedPack( |
| 568 | &ExplicitArgs, |
| 569 | &NumExplicitArgs)) { |
| 570 | if (getDepthAndIndex(PartiallySubstitutedPack).second == PackIndices[I]) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 571 | NewlyDeducedPacks[I].append(ExplicitArgs, |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 572 | ExplicitArgs + NumExplicitArgs); |
| 573 | } |
| 574 | } |
| 575 | } |
| 576 | |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 577 | /// \brief Finish template argument deduction for a set of argument packs, |
| 578 | /// producing the argument packs and checking for consistency with prior |
| 579 | /// deductions. |
| 580 | static Sema::TemplateDeductionResult |
| 581 | FinishArgumentPackDeduction(Sema &S, |
| 582 | TemplateParameterList *TemplateParams, |
| 583 | bool HasAnyArguments, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 584 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
| 585 | const SmallVectorImpl<unsigned> &PackIndices, |
| 586 | SmallVectorImpl<DeducedTemplateArgument> &SavedPacks, |
| 587 | SmallVectorImpl< |
| 588 | SmallVector<DeducedTemplateArgument, 4> > &NewlyDeducedPacks, |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 589 | TemplateDeductionInfo &Info) { |
| 590 | // Build argument packs for each of the parameter packs expanded by this |
| 591 | // pack expansion. |
| 592 | for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { |
| 593 | if (HasAnyArguments && NewlyDeducedPacks[I].empty()) { |
| 594 | // We were not able to deduce anything for this parameter pack, |
| 595 | // so just restore the saved argument pack. |
| 596 | Deduced[PackIndices[I]] = SavedPacks[I]; |
| 597 | continue; |
| 598 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 599 | |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 600 | DeducedTemplateArgument NewPack; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 601 | |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 602 | if (NewlyDeducedPacks[I].empty()) { |
| 603 | // If we deduced an empty argument pack, create it now. |
| 604 | NewPack = DeducedTemplateArgument(TemplateArgument(0, 0)); |
| 605 | } else { |
| 606 | TemplateArgument *ArgumentPack |
Douglas Gregor | 203e6a3 | 2011-01-11 23:09:57 +0000 | [diff] [blame] | 607 | = new (S.Context) TemplateArgument [NewlyDeducedPacks[I].size()]; |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 608 | std::copy(NewlyDeducedPacks[I].begin(), NewlyDeducedPacks[I].end(), |
| 609 | ArgumentPack); |
| 610 | NewPack |
Douglas Gregor | 203e6a3 | 2011-01-11 23:09:57 +0000 | [diff] [blame] | 611 | = DeducedTemplateArgument(TemplateArgument(ArgumentPack, |
| 612 | NewlyDeducedPacks[I].size()), |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 613 | NewlyDeducedPacks[I][0].wasDeducedFromArrayBound()); |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 614 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 615 | |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 616 | DeducedTemplateArgument Result |
| 617 | = checkDeducedTemplateArguments(S.Context, SavedPacks[I], NewPack); |
| 618 | if (Result.isNull()) { |
| 619 | Info.Param |
| 620 | = makeTemplateParameter(TemplateParams->getParam(PackIndices[I])); |
| 621 | Info.FirstArg = SavedPacks[I]; |
| 622 | Info.SecondArg = NewPack; |
| 623 | return Sema::TDK_Inconsistent; |
| 624 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 625 | |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 626 | Deduced[PackIndices[I]] = Result; |
| 627 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 628 | |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 629 | return Sema::TDK_Success; |
| 630 | } |
| 631 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 632 | /// \brief Deduce the template arguments by comparing the list of parameter |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 633 | /// types to the list of argument types, as in the parameter-type-lists of |
| 634 | /// function types (C++ [temp.deduct.type]p10). |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 635 | /// |
| 636 | /// \param S The semantic analysis object within which we are deducing |
| 637 | /// |
| 638 | /// \param TemplateParams The template parameters that we are deducing |
| 639 | /// |
| 640 | /// \param Params The list of parameter types |
| 641 | /// |
| 642 | /// \param NumParams The number of types in \c Params |
| 643 | /// |
| 644 | /// \param Args The list of argument types |
| 645 | /// |
| 646 | /// \param NumArgs The number of types in \c Args |
| 647 | /// |
| 648 | /// \param Info information about the template argument deduction itself |
| 649 | /// |
| 650 | /// \param Deduced the deduced template arguments |
| 651 | /// |
| 652 | /// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe |
| 653 | /// how template argument deduction is performed. |
| 654 | /// |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 655 | /// \param PartialOrdering If true, we are performing template argument |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 656 | /// deduction for during partial ordering for a call |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 657 | /// (C++0x [temp.deduct.partial]). |
| 658 | /// |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 659 | /// \param RefParamComparisons If we're performing template argument deduction |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 660 | /// in the context of partial ordering, the set of qualifier comparisons. |
| 661 | /// |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 662 | /// \returns the result of template argument deduction so far. Note that a |
| 663 | /// "success" result means that template argument deduction has not yet failed, |
| 664 | /// but it may still fail, later, for other reasons. |
| 665 | static Sema::TemplateDeductionResult |
| 666 | DeduceTemplateArguments(Sema &S, |
| 667 | TemplateParameterList *TemplateParams, |
| 668 | const QualType *Params, unsigned NumParams, |
| 669 | const QualType *Args, unsigned NumArgs, |
| 670 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 671 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 672 | unsigned TDF, |
| 673 | bool PartialOrdering = false, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 674 | SmallVectorImpl<RefParamPartialOrderingComparison> * |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 675 | RefParamComparisons = 0) { |
Douglas Gregor | 0bbacf8 | 2011-01-05 23:23:17 +0000 | [diff] [blame] | 676 | // Fast-path check to see if we have too many/too few arguments. |
| 677 | if (NumParams != NumArgs && |
| 678 | !(NumParams && isa<PackExpansionType>(Params[NumParams - 1])) && |
| 679 | !(NumArgs && isa<PackExpansionType>(Args[NumArgs - 1]))) |
Douglas Gregor | 3cae5c9 | 2011-01-10 20:53:55 +0000 | [diff] [blame] | 680 | return Sema::TDK_NonDeducedMismatch; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 681 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 682 | // C++0x [temp.deduct.type]p10: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 683 | // Similarly, if P has a form that contains (T), then each parameter type |
| 684 | // Pi of the respective parameter-type- list of P is compared with the |
| 685 | // corresponding parameter type Ai of the corresponding parameter-type-list |
| 686 | // of A. [...] |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 687 | unsigned ArgIdx = 0, ParamIdx = 0; |
| 688 | for (; ParamIdx != NumParams; ++ParamIdx) { |
| 689 | // Check argument types. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 690 | const PackExpansionType *Expansion |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 691 | = dyn_cast<PackExpansionType>(Params[ParamIdx]); |
| 692 | if (!Expansion) { |
| 693 | // Simple case: compare the parameter and argument types at this point. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 694 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 695 | // Make sure we have an argument. |
| 696 | if (ArgIdx >= NumArgs) |
Douglas Gregor | 3cae5c9 | 2011-01-10 20:53:55 +0000 | [diff] [blame] | 697 | return Sema::TDK_NonDeducedMismatch; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 698 | |
Douglas Gregor | 77d6bb9 | 2011-01-11 22:21:24 +0000 | [diff] [blame] | 699 | if (isa<PackExpansionType>(Args[ArgIdx])) { |
| 700 | // C++0x [temp.deduct.type]p22: |
| 701 | // If the original function parameter associated with A is a function |
| 702 | // parameter pack and the function parameter associated with P is not |
| 703 | // a function parameter pack, then template argument deduction fails. |
| 704 | return Sema::TDK_NonDeducedMismatch; |
| 705 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 706 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 707 | if (Sema::TemplateDeductionResult Result |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 708 | = DeduceTemplateArguments(S, TemplateParams, |
| 709 | Params[ParamIdx], |
| 710 | Args[ArgIdx], |
| 711 | Info, Deduced, TDF, |
| 712 | PartialOrdering, |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 713 | RefParamComparisons)) |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 714 | return Result; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 715 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 716 | ++ArgIdx; |
| 717 | continue; |
| 718 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 719 | |
Douglas Gregor | 7d5c0c1 | 2011-01-11 01:52:23 +0000 | [diff] [blame] | 720 | // C++0x [temp.deduct.type]p5: |
| 721 | // The non-deduced contexts are: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 722 | // - A function parameter pack that does not occur at the end of the |
Douglas Gregor | 7d5c0c1 | 2011-01-11 01:52:23 +0000 | [diff] [blame] | 723 | // parameter-declaration-clause. |
| 724 | if (ParamIdx + 1 < NumParams) |
| 725 | return Sema::TDK_Success; |
| 726 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 727 | // C++0x [temp.deduct.type]p10: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 728 | // If the parameter-declaration corresponding to Pi is a function |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 729 | // parameter pack, then the type of its declarator- id is compared with |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 730 | // each remaining parameter type in the parameter-type-list of A. Each |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 731 | // comparison deduces template arguments for subsequent positions in the |
| 732 | // template parameter packs expanded by the function parameter pack. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 733 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 734 | // Compute the set of template parameter indices that correspond to |
| 735 | // parameter packs expanded by the pack expansion. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 736 | SmallVector<unsigned, 2> PackIndices; |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 737 | QualType Pattern = Expansion->getPattern(); |
| 738 | { |
| 739 | llvm::BitVector SawIndices(TemplateParams->size()); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 740 | SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 741 | S.collectUnexpandedParameterPacks(Pattern, Unexpanded); |
| 742 | for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { |
| 743 | unsigned Depth, Index; |
| 744 | llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); |
| 745 | if (Depth == 0 && !SawIndices[Index]) { |
| 746 | SawIndices[Index] = true; |
| 747 | PackIndices.push_back(Index); |
| 748 | } |
| 749 | } |
| 750 | } |
| 751 | assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); |
| 752 | |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 753 | // Keep track of the deduced template arguments for each parameter pack |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 754 | // expanded by this pack expansion (the outer index) and for each |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 755 | // template argument (the inner SmallVectors). |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 756 | SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 757 | NewlyDeducedPacks(PackIndices.size()); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 758 | SmallVector<DeducedTemplateArgument, 2> |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 759 | SavedPacks(PackIndices.size()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 760 | PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 761 | NewlyDeducedPacks); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 762 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 763 | bool HasAnyArguments = false; |
| 764 | for (; ArgIdx < NumArgs; ++ArgIdx) { |
| 765 | HasAnyArguments = true; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 766 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 767 | // Deduce template arguments from the pattern. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 768 | if (Sema::TemplateDeductionResult Result |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 769 | = DeduceTemplateArguments(S, TemplateParams, Pattern, Args[ArgIdx], |
| 770 | Info, Deduced, TDF, PartialOrdering, |
| 771 | RefParamComparisons)) |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 772 | return Result; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 773 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 774 | // Capture the deduced template arguments for each parameter pack expanded |
| 775 | // by this pack expansion, add them to the list of arguments we've deduced |
| 776 | // for that pack, then clear out the deduced argument. |
| 777 | for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { |
| 778 | DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; |
| 779 | if (!DeducedArg.isNull()) { |
| 780 | NewlyDeducedPacks[I].push_back(DeducedArg); |
| 781 | DeducedArg = DeducedTemplateArgument(); |
| 782 | } |
| 783 | } |
| 784 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 785 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 786 | // Build argument packs for each of the parameter packs expanded by this |
| 787 | // pack expansion. |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 788 | if (Sema::TemplateDeductionResult Result |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 789 | = FinishArgumentPackDeduction(S, TemplateParams, HasAnyArguments, |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 790 | Deduced, PackIndices, SavedPacks, |
| 791 | NewlyDeducedPacks, Info)) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 792 | return Result; |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 793 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 794 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 795 | // Make sure we don't have any extra arguments. |
| 796 | if (ArgIdx < NumArgs) |
Douglas Gregor | 3cae5c9 | 2011-01-10 20:53:55 +0000 | [diff] [blame] | 797 | return Sema::TDK_NonDeducedMismatch; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 798 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 799 | return Sema::TDK_Success; |
| 800 | } |
| 801 | |
Douglas Gregor | 61d0b6b | 2011-04-28 00:56:09 +0000 | [diff] [blame] | 802 | /// \brief Determine whether the parameter has qualifiers that are either |
| 803 | /// inconsistent with or a superset of the argument's qualifiers. |
| 804 | static bool hasInconsistentOrSupersetQualifiersOf(QualType ParamType, |
| 805 | QualType ArgType) { |
| 806 | Qualifiers ParamQs = ParamType.getQualifiers(); |
| 807 | Qualifiers ArgQs = ArgType.getQualifiers(); |
| 808 | |
| 809 | if (ParamQs == ArgQs) |
| 810 | return false; |
| 811 | |
| 812 | // Mismatched (but not missing) Objective-C GC attributes. |
| 813 | if (ParamQs.getObjCGCAttr() != ArgQs.getObjCGCAttr() && |
| 814 | ParamQs.hasObjCGCAttr()) |
| 815 | return true; |
| 816 | |
| 817 | // Mismatched (but not missing) address spaces. |
| 818 | if (ParamQs.getAddressSpace() != ArgQs.getAddressSpace() && |
| 819 | ParamQs.hasAddressSpace()) |
| 820 | return true; |
| 821 | |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 822 | // Mismatched (but not missing) Objective-C lifetime qualifiers. |
| 823 | if (ParamQs.getObjCLifetime() != ArgQs.getObjCLifetime() && |
| 824 | ParamQs.hasObjCLifetime()) |
| 825 | return true; |
| 826 | |
Douglas Gregor | 61d0b6b | 2011-04-28 00:56:09 +0000 | [diff] [blame] | 827 | // CVR qualifier superset. |
| 828 | return (ParamQs.getCVRQualifiers() != ArgQs.getCVRQualifiers()) && |
| 829 | ((ParamQs.getCVRQualifiers() | ArgQs.getCVRQualifiers()) |
| 830 | == ParamQs.getCVRQualifiers()); |
| 831 | } |
| 832 | |
Douglas Gregor | 500d331 | 2009-06-26 18:27:22 +0000 | [diff] [blame] | 833 | /// \brief Deduce the template arguments by comparing the parameter type and |
| 834 | /// the argument type (C++ [temp.deduct.type]). |
| 835 | /// |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 836 | /// \param S the semantic analysis object within which we are deducing |
Douglas Gregor | 500d331 | 2009-06-26 18:27:22 +0000 | [diff] [blame] | 837 | /// |
| 838 | /// \param TemplateParams the template parameters that we are deducing |
| 839 | /// |
| 840 | /// \param ParamIn the parameter type |
| 841 | /// |
| 842 | /// \param ArgIn the argument type |
| 843 | /// |
| 844 | /// \param Info information about the template argument deduction itself |
| 845 | /// |
| 846 | /// \param Deduced the deduced template arguments |
| 847 | /// |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 848 | /// \param TDF bitwise OR of the TemplateDeductionFlags bits that describe |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 849 | /// how template argument deduction is performed. |
Douglas Gregor | 500d331 | 2009-06-26 18:27:22 +0000 | [diff] [blame] | 850 | /// |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 851 | /// \param PartialOrdering Whether we're performing template argument deduction |
| 852 | /// in the context of partial ordering (C++0x [temp.deduct.partial]). |
| 853 | /// |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 854 | /// \param RefParamComparisons If we're performing template argument deduction |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 855 | /// in the context of partial ordering, the set of qualifier comparisons. |
| 856 | /// |
Douglas Gregor | 500d331 | 2009-06-26 18:27:22 +0000 | [diff] [blame] | 857 | /// \returns the result of template argument deduction so far. Note that a |
| 858 | /// "success" result means that template argument deduction has not yet failed, |
| 859 | /// but it may still fail, later, for other reasons. |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 860 | static Sema::TemplateDeductionResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 861 | DeduceTemplateArguments(Sema &S, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 862 | TemplateParameterList *TemplateParams, |
| 863 | QualType ParamIn, QualType ArgIn, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 864 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 865 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 866 | unsigned TDF, |
| 867 | bool PartialOrdering, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 868 | SmallVectorImpl<RefParamPartialOrderingComparison> *RefParamComparisons) { |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 869 | // We only want to look at the canonical types, since typedefs and |
| 870 | // sugar are not part of template argument deduction. |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 871 | QualType Param = S.Context.getCanonicalType(ParamIn); |
| 872 | QualType Arg = S.Context.getCanonicalType(ArgIn); |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 873 | |
Douglas Gregor | 77d6bb9 | 2011-01-11 22:21:24 +0000 | [diff] [blame] | 874 | // If the argument type is a pack expansion, look at its pattern. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 875 | // This isn't explicitly called out |
Douglas Gregor | 77d6bb9 | 2011-01-11 22:21:24 +0000 | [diff] [blame] | 876 | if (const PackExpansionType *ArgExpansion |
| 877 | = dyn_cast<PackExpansionType>(Arg)) |
| 878 | Arg = ArgExpansion->getPattern(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 879 | |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 880 | if (PartialOrdering) { |
| 881 | // C++0x [temp.deduct.partial]p5: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 882 | // Before the partial ordering is done, certain transformations are |
| 883 | // performed on the types used for partial ordering: |
| 884 | // - If P is a reference type, P is replaced by the type referred to. |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 885 | const ReferenceType *ParamRef = Param->getAs<ReferenceType>(); |
| 886 | if (ParamRef) |
| 887 | Param = ParamRef->getPointeeType(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 888 | |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 889 | // - If A is a reference type, A is replaced by the type referred to. |
| 890 | const ReferenceType *ArgRef = Arg->getAs<ReferenceType>(); |
| 891 | if (ArgRef) |
| 892 | Arg = ArgRef->getPointeeType(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 893 | |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 894 | if (RefParamComparisons && ParamRef && ArgRef) { |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 895 | // C++0x [temp.deduct.partial]p6: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 896 | // If both P and A were reference types (before being replaced with the |
| 897 | // type referred to above), determine which of the two types (if any) is |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 898 | // more cv-qualified than the other; otherwise the types are considered |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 899 | // to be equally cv-qualified for partial ordering purposes. The result |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 900 | // of this determination will be used below. |
| 901 | // |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 902 | // We save this information for later, using it only when deduction |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 903 | // succeeds in both directions. |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 904 | RefParamPartialOrderingComparison Comparison; |
| 905 | Comparison.ParamIsRvalueRef = ParamRef->getAs<RValueReferenceType>(); |
| 906 | Comparison.ArgIsRvalueRef = ArgRef->getAs<RValueReferenceType>(); |
| 907 | Comparison.Qualifiers = NeitherMoreQualified; |
Douglas Gregor | 769d0cc | 2011-04-30 17:07:52 +0000 | [diff] [blame] | 908 | |
| 909 | Qualifiers ParamQuals = Param.getQualifiers(); |
| 910 | Qualifiers ArgQuals = Arg.getQualifiers(); |
| 911 | if (ParamQuals.isStrictSupersetOf(ArgQuals)) |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 912 | Comparison.Qualifiers = ParamMoreQualified; |
Douglas Gregor | 769d0cc | 2011-04-30 17:07:52 +0000 | [diff] [blame] | 913 | else if (ArgQuals.isStrictSupersetOf(ParamQuals)) |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 914 | Comparison.Qualifiers = ArgMoreQualified; |
| 915 | RefParamComparisons->push_back(Comparison); |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 916 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 917 | |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 918 | // C++0x [temp.deduct.partial]p7: |
| 919 | // Remove any top-level cv-qualifiers: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 920 | // - If P is a cv-qualified type, P is replaced by the cv-unqualified |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 921 | // version of P. |
| 922 | Param = Param.getUnqualifiedType(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 923 | // - If A is a cv-qualified type, A is replaced by the cv-unqualified |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 924 | // version of A. |
| 925 | Arg = Arg.getUnqualifiedType(); |
| 926 | } else { |
| 927 | // C++0x [temp.deduct.call]p4 bullet 1: |
| 928 | // - If the original P is a reference type, the deduced A (i.e., the type |
| 929 | // referred to by the reference) can be more cv-qualified than the |
| 930 | // transformed A. |
| 931 | if (TDF & TDF_ParamWithReferenceType) { |
| 932 | Qualifiers Quals; |
| 933 | QualType UnqualParam = S.Context.getUnqualifiedArrayType(Param, Quals); |
| 934 | Quals.setCVRQualifiers(Quals.getCVRQualifiers() & |
John McCall | 62c28c8 | 2011-01-18 07:41:22 +0000 | [diff] [blame] | 935 | Arg.getCVRQualifiers()); |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 936 | Param = S.Context.getQualifiedType(UnqualParam, Quals); |
| 937 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 938 | |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 939 | if ((TDF & TDF_TopLevelParameterTypeList) && !Param->isFunctionType()) { |
| 940 | // C++0x [temp.deduct.type]p10: |
| 941 | // If P and A are function types that originated from deduction when |
| 942 | // taking the address of a function template (14.8.2.2) or when deducing |
| 943 | // template arguments from a function declaration (14.8.2.6) and Pi and |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 944 | // Ai are parameters of the top-level parameter-type-list of P and A, |
| 945 | // respectively, Pi is adjusted if it is an rvalue reference to a |
| 946 | // cv-unqualified template parameter and Ai is an lvalue reference, in |
| 947 | // which case the type of Pi is changed to be the template parameter |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 948 | // type (i.e., T&& is changed to simply T). [ Note: As a result, when |
| 949 | // Pi is T&& and Ai is X&, the adjusted Pi will be T, causing T to be |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame] | 950 | // deduced as X&. - end note ] |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 951 | TDF &= ~TDF_TopLevelParameterTypeList; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 952 | |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 953 | if (const RValueReferenceType *ParamRef |
| 954 | = Param->getAs<RValueReferenceType>()) { |
| 955 | if (isa<TemplateTypeParmType>(ParamRef->getPointeeType()) && |
| 956 | !ParamRef->getPointeeType().getQualifiers()) |
| 957 | if (Arg->isLValueReferenceType()) |
| 958 | Param = ParamRef->getPointeeType(); |
| 959 | } |
| 960 | } |
Douglas Gregor | 500d331 | 2009-06-26 18:27:22 +0000 | [diff] [blame] | 961 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 962 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 963 | // If the parameter type is not dependent, there is nothing to deduce. |
Douglas Gregor | 1282029 | 2009-09-14 20:00:47 +0000 | [diff] [blame] | 964 | if (!Param->isDependentType()) { |
Douglas Gregor | 3cae5c9 | 2011-01-10 20:53:55 +0000 | [diff] [blame] | 965 | if (!(TDF & TDF_SkipNonDependent) && Param != Arg) |
Douglas Gregor | 1282029 | 2009-09-14 20:00:47 +0000 | [diff] [blame] | 966 | return Sema::TDK_NonDeducedMismatch; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 967 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 968 | return Sema::TDK_Success; |
Douglas Gregor | 1282029 | 2009-09-14 20:00:47 +0000 | [diff] [blame] | 969 | } |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 970 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 971 | // C++ [temp.deduct.type]p9: |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 972 | // A template type argument T, a template template argument TT or a |
| 973 | // template non-type argument i can be deduced if P and A have one of |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 974 | // the following forms: |
| 975 | // |
| 976 | // T |
| 977 | // cv-list T |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 978 | if (const TemplateTypeParmType *TemplateTypeParm |
John McCall | 183700f | 2009-09-21 23:43:11 +0000 | [diff] [blame] | 979 | = Param->getAs<TemplateTypeParmType>()) { |
Douglas Gregor | af130823 | 2011-09-22 15:57:07 +0000 | [diff] [blame] | 980 | // Just skip any attempts to deduce from a placeholder type. |
| 981 | if (Arg->isPlaceholderType()) |
| 982 | return Sema::TDK_Success; |
| 983 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 984 | unsigned Index = TemplateTypeParm->getIndex(); |
Douglas Gregor | f290e0d | 2009-07-22 21:30:48 +0000 | [diff] [blame] | 985 | bool RecanonicalizeArg = false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 986 | |
Douglas Gregor | 9e9fae4 | 2009-07-22 20:02:25 +0000 | [diff] [blame] | 987 | // If the argument type is an array type, move the qualifiers up to the |
| 988 | // top level, so they can be matched with the qualifiers on the parameter. |
Douglas Gregor | f290e0d | 2009-07-22 21:30:48 +0000 | [diff] [blame] | 989 | if (isa<ArrayType>(Arg)) { |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 990 | Qualifiers Quals; |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 991 | Arg = S.Context.getUnqualifiedArrayType(Arg, Quals); |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 992 | if (Quals) { |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 993 | Arg = S.Context.getQualifiedType(Arg, Quals); |
Douglas Gregor | f290e0d | 2009-07-22 21:30:48 +0000 | [diff] [blame] | 994 | RecanonicalizeArg = true; |
| 995 | } |
| 996 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 997 | |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 998 | // The argument type can not be less qualified than the parameter |
| 999 | // type. |
Douglas Gregor | 61d0b6b | 2011-04-28 00:56:09 +0000 | [diff] [blame] | 1000 | if (!(TDF & TDF_IgnoreQualifiers) && |
| 1001 | hasInconsistentOrSupersetQualifiersOf(Param, Arg)) { |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1002 | Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); |
John McCall | 57e9778 | 2010-08-05 09:05:08 +0000 | [diff] [blame] | 1003 | Info.FirstArg = TemplateArgument(Param); |
John McCall | 833ca99 | 2009-10-29 08:12:44 +0000 | [diff] [blame] | 1004 | Info.SecondArg = TemplateArgument(Arg); |
John McCall | 57e9778 | 2010-08-05 09:05:08 +0000 | [diff] [blame] | 1005 | return Sema::TDK_Underqualified; |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1006 | } |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1007 | |
| 1008 | assert(TemplateTypeParm->getDepth() == 0 && "Can't deduce with depth > 0"); |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1009 | assert(Arg != S.Context.OverloadTy && "Unresolved overloaded function"); |
John McCall | 0953e76 | 2009-09-24 19:53:00 +0000 | [diff] [blame] | 1010 | QualType DeducedType = Arg; |
John McCall | 49f4e1c | 2010-12-10 11:01:00 +0000 | [diff] [blame] | 1011 | |
Douglas Gregor | 61d0b6b | 2011-04-28 00:56:09 +0000 | [diff] [blame] | 1012 | // Remove any qualifiers on the parameter from the deduced type. |
| 1013 | // We checked the qualifiers for consistency above. |
| 1014 | Qualifiers DeducedQs = DeducedType.getQualifiers(); |
| 1015 | Qualifiers ParamQs = Param.getQualifiers(); |
| 1016 | DeducedQs.removeCVRQualifiers(ParamQs.getCVRQualifiers()); |
| 1017 | if (ParamQs.hasObjCGCAttr()) |
| 1018 | DeducedQs.removeObjCGCAttr(); |
| 1019 | if (ParamQs.hasAddressSpace()) |
| 1020 | DeducedQs.removeAddressSpace(); |
John McCall | f85e193 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 1021 | if (ParamQs.hasObjCLifetime()) |
| 1022 | DeducedQs.removeObjCLifetime(); |
Douglas Gregor | e559ca1 | 2011-06-17 22:11:49 +0000 | [diff] [blame] | 1023 | |
| 1024 | // Objective-C ARC: |
Douglas Gregor | da8b249 | 2011-07-26 14:53:44 +0000 | [diff] [blame] | 1025 | // If template deduction would produce a lifetime qualifier on a type |
| 1026 | // that is not a lifetime type, template argument deduction fails. |
| 1027 | if (ParamQs.hasObjCLifetime() && !DeducedType->isObjCLifetimeType() && |
| 1028 | !DeducedType->isDependentType()) { |
| 1029 | Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); |
| 1030 | Info.FirstArg = TemplateArgument(Param); |
| 1031 | Info.SecondArg = TemplateArgument(Arg); |
| 1032 | return Sema::TDK_Underqualified; |
| 1033 | } |
| 1034 | |
| 1035 | // Objective-C ARC: |
Douglas Gregor | e559ca1 | 2011-06-17 22:11:49 +0000 | [diff] [blame] | 1036 | // If template deduction would produce an argument type with lifetime type |
| 1037 | // but no lifetime qualifier, the __strong lifetime qualifier is inferred. |
| 1038 | if (S.getLangOptions().ObjCAutoRefCount && |
| 1039 | DeducedType->isObjCLifetimeType() && |
| 1040 | !DeducedQs.hasObjCLifetime()) |
| 1041 | DeducedQs.setObjCLifetime(Qualifiers::OCL_Strong); |
| 1042 | |
Douglas Gregor | 61d0b6b | 2011-04-28 00:56:09 +0000 | [diff] [blame] | 1043 | DeducedType = S.Context.getQualifiedType(DeducedType.getUnqualifiedType(), |
| 1044 | DeducedQs); |
| 1045 | |
Douglas Gregor | f290e0d | 2009-07-22 21:30:48 +0000 | [diff] [blame] | 1046 | if (RecanonicalizeArg) |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1047 | DeducedType = S.Context.getCanonicalType(DeducedType); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1048 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 1049 | DeducedTemplateArgument NewDeduced(DeducedType); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1050 | DeducedTemplateArgument Result = checkDeducedTemplateArguments(S.Context, |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 1051 | Deduced[Index], |
| 1052 | NewDeduced); |
| 1053 | if (Result.isNull()) { |
| 1054 | Info.Param = cast<TemplateTypeParmDecl>(TemplateParams->getParam(Index)); |
| 1055 | Info.FirstArg = Deduced[Index]; |
| 1056 | Info.SecondArg = NewDeduced; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1057 | return Sema::TDK_Inconsistent; |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1058 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1059 | |
Douglas Gregor | 0d80abc | 2010-12-22 23:09:49 +0000 | [diff] [blame] | 1060 | Deduced[Index] = Result; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1061 | return Sema::TDK_Success; |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1062 | } |
| 1063 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1064 | // Set up the template argument deduction information for a failure. |
John McCall | 833ca99 | 2009-10-29 08:12:44 +0000 | [diff] [blame] | 1065 | Info.FirstArg = TemplateArgument(ParamIn); |
| 1066 | Info.SecondArg = TemplateArgument(ArgIn); |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1067 | |
Douglas Gregor | 0bc15d9 | 2011-01-14 05:11:40 +0000 | [diff] [blame] | 1068 | // If the parameter is an already-substituted template parameter |
| 1069 | // pack, do nothing: we don't know which of its arguments to look |
| 1070 | // at, so we have to wait until all of the parameter packs in this |
| 1071 | // expansion have arguments. |
| 1072 | if (isa<SubstTemplateTypeParmPackType>(Param)) |
| 1073 | return Sema::TDK_Success; |
| 1074 | |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1075 | // Check the cv-qualifiers on the parameter and argument types. |
| 1076 | if (!(TDF & TDF_IgnoreQualifiers)) { |
| 1077 | if (TDF & TDF_ParamWithReferenceType) { |
Douglas Gregor | 61d0b6b | 2011-04-28 00:56:09 +0000 | [diff] [blame] | 1078 | if (hasInconsistentOrSupersetQualifiersOf(Param, Arg)) |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1079 | return Sema::TDK_NonDeducedMismatch; |
John McCall | cd05e81 | 2010-08-28 22:14:41 +0000 | [diff] [blame] | 1080 | } else if (!IsPossiblyOpaquelyQualifiedType(Param)) { |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1081 | if (Param.getCVRQualifiers() != Arg.getCVRQualifiers()) |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1082 | return Sema::TDK_NonDeducedMismatch; |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1083 | } |
| 1084 | } |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1085 | |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1086 | switch (Param->getTypeClass()) { |
Douglas Gregor | 4ac0140 | 2011-06-15 16:02:29 +0000 | [diff] [blame] | 1087 | // Non-canonical types cannot appear here. |
| 1088 | #define NON_CANONICAL_TYPE(Class, Base) \ |
| 1089 | case Type::Class: llvm_unreachable("deducing non-canonical type: " #Class); |
| 1090 | #define TYPE(Class, Base) |
| 1091 | #include "clang/AST/TypeNodes.def" |
| 1092 | |
| 1093 | case Type::TemplateTypeParm: |
| 1094 | case Type::SubstTemplateTypeParmPack: |
| 1095 | llvm_unreachable("Type nodes handled above"); |
| 1096 | |
| 1097 | // These types cannot be used in templates or cannot be dependent, so |
| 1098 | // deduction always fails. |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1099 | case Type::Builtin: |
Douglas Gregor | 4ac0140 | 2011-06-15 16:02:29 +0000 | [diff] [blame] | 1100 | case Type::VariableArray: |
| 1101 | case Type::Vector: |
| 1102 | case Type::FunctionNoProto: |
| 1103 | case Type::Record: |
| 1104 | case Type::Enum: |
| 1105 | case Type::ObjCObject: |
| 1106 | case Type::ObjCInterface: |
| 1107 | case Type::ObjCObjectPointer: |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1108 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1109 | |
Douglas Gregor | 4ac0140 | 2011-06-15 16:02:29 +0000 | [diff] [blame] | 1110 | // _Complex T [placeholder extension] |
| 1111 | case Type::Complex: |
| 1112 | if (const ComplexType *ComplexArg = Arg->getAs<ComplexType>()) |
| 1113 | return DeduceTemplateArguments(S, TemplateParams, |
| 1114 | cast<ComplexType>(Param)->getElementType(), |
| 1115 | ComplexArg->getElementType(), |
| 1116 | Info, Deduced, TDF); |
| 1117 | |
| 1118 | return Sema::TDK_NonDeducedMismatch; |
Eli Friedman | b001de7 | 2011-10-06 23:00:33 +0000 | [diff] [blame] | 1119 | |
| 1120 | // _Atomic T [extension] |
| 1121 | case Type::Atomic: |
| 1122 | if (const AtomicType *AtomicArg = Arg->getAs<AtomicType>()) |
| 1123 | return DeduceTemplateArguments(S, TemplateParams, |
| 1124 | cast<AtomicType>(Param)->getValueType(), |
| 1125 | AtomicArg->getValueType(), |
| 1126 | Info, Deduced, TDF); |
| 1127 | |
| 1128 | return Sema::TDK_NonDeducedMismatch; |
| 1129 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1130 | // T * |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1131 | case Type::Pointer: { |
John McCall | c000834 | 2010-05-13 07:48:05 +0000 | [diff] [blame] | 1132 | QualType PointeeType; |
| 1133 | if (const PointerType *PointerArg = Arg->getAs<PointerType>()) { |
| 1134 | PointeeType = PointerArg->getPointeeType(); |
| 1135 | } else if (const ObjCObjectPointerType *PointerArg |
| 1136 | = Arg->getAs<ObjCObjectPointerType>()) { |
| 1137 | PointeeType = PointerArg->getPointeeType(); |
| 1138 | } else { |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1139 | return Sema::TDK_NonDeducedMismatch; |
John McCall | c000834 | 2010-05-13 07:48:05 +0000 | [diff] [blame] | 1140 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1141 | |
Douglas Gregor | 4112877 | 2009-06-26 23:27:24 +0000 | [diff] [blame] | 1142 | unsigned SubTDF = TDF & (TDF_IgnoreQualifiers | TDF_DerivedClass); |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1143 | return DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1144 | cast<PointerType>(Param)->getPointeeType(), |
John McCall | c000834 | 2010-05-13 07:48:05 +0000 | [diff] [blame] | 1145 | PointeeType, |
Douglas Gregor | 4112877 | 2009-06-26 23:27:24 +0000 | [diff] [blame] | 1146 | Info, Deduced, SubTDF); |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1147 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1148 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1149 | // T & |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1150 | case Type::LValueReference: { |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 1151 | const LValueReferenceType *ReferenceArg = Arg->getAs<LValueReferenceType>(); |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1152 | if (!ReferenceArg) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1153 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1154 | |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1155 | return DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1156 | cast<LValueReferenceType>(Param)->getPointeeType(), |
| 1157 | ReferenceArg->getPointeeType(), |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1158 | Info, Deduced, 0); |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1159 | } |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1160 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1161 | // T && [C++0x] |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1162 | case Type::RValueReference: { |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 1163 | const RValueReferenceType *ReferenceArg = Arg->getAs<RValueReferenceType>(); |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1164 | if (!ReferenceArg) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1165 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1166 | |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1167 | return DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1168 | cast<RValueReferenceType>(Param)->getPointeeType(), |
| 1169 | ReferenceArg->getPointeeType(), |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1170 | Info, Deduced, 0); |
Douglas Gregor | d560d50 | 2009-06-04 00:21:18 +0000 | [diff] [blame] | 1171 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1172 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1173 | // T [] (implied, but not stated explicitly) |
Anders Carlsson | 4d6fb50 | 2009-06-04 04:11:30 +0000 | [diff] [blame] | 1174 | case Type::IncompleteArray: { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1175 | const IncompleteArrayType *IncompleteArrayArg = |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1176 | S.Context.getAsIncompleteArrayType(Arg); |
Anders Carlsson | 4d6fb50 | 2009-06-04 04:11:30 +0000 | [diff] [blame] | 1177 | if (!IncompleteArrayArg) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1178 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1179 | |
John McCall | e4f26e5 | 2010-08-19 00:20:19 +0000 | [diff] [blame] | 1180 | unsigned SubTDF = TDF & TDF_IgnoreQualifiers; |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1181 | return DeduceTemplateArguments(S, TemplateParams, |
| 1182 | S.Context.getAsIncompleteArrayType(Param)->getElementType(), |
Anders Carlsson | 4d6fb50 | 2009-06-04 04:11:30 +0000 | [diff] [blame] | 1183 | IncompleteArrayArg->getElementType(), |
John McCall | e4f26e5 | 2010-08-19 00:20:19 +0000 | [diff] [blame] | 1184 | Info, Deduced, SubTDF); |
Anders Carlsson | 4d6fb50 | 2009-06-04 04:11:30 +0000 | [diff] [blame] | 1185 | } |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1186 | |
| 1187 | // T [integer-constant] |
Anders Carlsson | 4d6fb50 | 2009-06-04 04:11:30 +0000 | [diff] [blame] | 1188 | case Type::ConstantArray: { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1189 | const ConstantArrayType *ConstantArrayArg = |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1190 | S.Context.getAsConstantArrayType(Arg); |
Anders Carlsson | 4d6fb50 | 2009-06-04 04:11:30 +0000 | [diff] [blame] | 1191 | if (!ConstantArrayArg) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1192 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1193 | |
| 1194 | const ConstantArrayType *ConstantArrayParm = |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1195 | S.Context.getAsConstantArrayType(Param); |
Anders Carlsson | 4d6fb50 | 2009-06-04 04:11:30 +0000 | [diff] [blame] | 1196 | if (ConstantArrayArg->getSize() != ConstantArrayParm->getSize()) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1197 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1198 | |
John McCall | e4f26e5 | 2010-08-19 00:20:19 +0000 | [diff] [blame] | 1199 | unsigned SubTDF = TDF & TDF_IgnoreQualifiers; |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1200 | return DeduceTemplateArguments(S, TemplateParams, |
Anders Carlsson | 4d6fb50 | 2009-06-04 04:11:30 +0000 | [diff] [blame] | 1201 | ConstantArrayParm->getElementType(), |
| 1202 | ConstantArrayArg->getElementType(), |
John McCall | e4f26e5 | 2010-08-19 00:20:19 +0000 | [diff] [blame] | 1203 | Info, Deduced, SubTDF); |
Anders Carlsson | 4d6fb50 | 2009-06-04 04:11:30 +0000 | [diff] [blame] | 1204 | } |
| 1205 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1206 | // type [i] |
| 1207 | case Type::DependentSizedArray: { |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1208 | const ArrayType *ArrayArg = S.Context.getAsArrayType(Arg); |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1209 | if (!ArrayArg) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1210 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1211 | |
John McCall | e4f26e5 | 2010-08-19 00:20:19 +0000 | [diff] [blame] | 1212 | unsigned SubTDF = TDF & TDF_IgnoreQualifiers; |
| 1213 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1214 | // Check the element type of the arrays |
| 1215 | const DependentSizedArrayType *DependentArrayParm |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1216 | = S.Context.getAsDependentSizedArrayType(Param); |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1217 | if (Sema::TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1218 | = DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1219 | DependentArrayParm->getElementType(), |
| 1220 | ArrayArg->getElementType(), |
John McCall | e4f26e5 | 2010-08-19 00:20:19 +0000 | [diff] [blame] | 1221 | Info, Deduced, SubTDF)) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1222 | return Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1223 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1224 | // Determine the array bound is something we can deduce. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1225 | NonTypeTemplateParmDecl *NTTP |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1226 | = getDeducedParameterFromExpr(DependentArrayParm->getSizeExpr()); |
| 1227 | if (!NTTP) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1228 | return Sema::TDK_Success; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1229 | |
| 1230 | // We can perform template argument deduction for the given non-type |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1231 | // template parameter. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1232 | assert(NTTP->getDepth() == 0 && |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1233 | "Cannot deduce non-type template argument at depth > 0"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1234 | if (const ConstantArrayType *ConstantArrayArg |
Anders Carlsson | 335e24a | 2009-06-16 22:44:31 +0000 | [diff] [blame] | 1235 | = dyn_cast<ConstantArrayType>(ArrayArg)) { |
| 1236 | llvm::APSInt Size(ConstantArrayArg->getSize()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1237 | return DeduceNonTypeTemplateArgument(S, NTTP, Size, |
Douglas Gregor | 9d0e441 | 2010-03-26 05:50:28 +0000 | [diff] [blame] | 1238 | S.Context.getSizeType(), |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 1239 | /*ArrayBound=*/true, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1240 | Info, Deduced); |
Anders Carlsson | 335e24a | 2009-06-16 22:44:31 +0000 | [diff] [blame] | 1241 | } |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1242 | if (const DependentSizedArrayType *DependentArrayArg |
| 1243 | = dyn_cast<DependentSizedArrayType>(ArrayArg)) |
Douglas Gregor | 34c2f8c | 2010-12-22 23:15:38 +0000 | [diff] [blame] | 1244 | if (DependentArrayArg->getSizeExpr()) |
| 1245 | return DeduceNonTypeTemplateArgument(S, NTTP, |
| 1246 | DependentArrayArg->getSizeExpr(), |
| 1247 | Info, Deduced); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1248 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1249 | // Incomplete type does not match a dependently-sized array type |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1250 | return Sema::TDK_NonDeducedMismatch; |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1251 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1252 | |
| 1253 | // type(*)(T) |
| 1254 | // T(*)() |
| 1255 | // T(*)(T) |
Anders Carlsson | a27fad5 | 2009-06-08 15:19:08 +0000 | [diff] [blame] | 1256 | case Type::FunctionProto: { |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 1257 | unsigned SubTDF = TDF & TDF_TopLevelParameterTypeList; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1258 | const FunctionProtoType *FunctionProtoArg = |
Anders Carlsson | a27fad5 | 2009-06-08 15:19:08 +0000 | [diff] [blame] | 1259 | dyn_cast<FunctionProtoType>(Arg); |
| 1260 | if (!FunctionProtoArg) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1261 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1262 | |
| 1263 | const FunctionProtoType *FunctionProtoParam = |
Anders Carlsson | a27fad5 | 2009-06-08 15:19:08 +0000 | [diff] [blame] | 1264 | cast<FunctionProtoType>(Param); |
Anders Carlsson | 994b6cb | 2009-06-08 19:22:23 +0000 | [diff] [blame] | 1265 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1266 | if (FunctionProtoParam->getTypeQuals() |
Douglas Gregor | e3c7a7c | 2011-01-26 16:50:54 +0000 | [diff] [blame] | 1267 | != FunctionProtoArg->getTypeQuals() || |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1268 | FunctionProtoParam->getRefQualifier() |
Douglas Gregor | e3c7a7c | 2011-01-26 16:50:54 +0000 | [diff] [blame] | 1269 | != FunctionProtoArg->getRefQualifier() || |
| 1270 | FunctionProtoParam->isVariadic() != FunctionProtoArg->isVariadic()) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1271 | return Sema::TDK_NonDeducedMismatch; |
Anders Carlsson | 994b6cb | 2009-06-08 19:22:23 +0000 | [diff] [blame] | 1272 | |
Anders Carlsson | a27fad5 | 2009-06-08 15:19:08 +0000 | [diff] [blame] | 1273 | // Check return types. |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1274 | if (Sema::TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1275 | = DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1276 | FunctionProtoParam->getResultType(), |
| 1277 | FunctionProtoArg->getResultType(), |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1278 | Info, Deduced, 0)) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1279 | return Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1280 | |
Douglas Gregor | 603cfb4 | 2011-01-05 23:12:31 +0000 | [diff] [blame] | 1281 | return DeduceTemplateArguments(S, TemplateParams, |
| 1282 | FunctionProtoParam->arg_type_begin(), |
| 1283 | FunctionProtoParam->getNumArgs(), |
| 1284 | FunctionProtoArg->arg_type_begin(), |
| 1285 | FunctionProtoArg->getNumArgs(), |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 1286 | Info, Deduced, SubTDF); |
Anders Carlsson | a27fad5 | 2009-06-08 15:19:08 +0000 | [diff] [blame] | 1287 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1288 | |
John McCall | 3cb0ebd | 2010-03-10 03:28:59 +0000 | [diff] [blame] | 1289 | case Type::InjectedClassName: { |
| 1290 | // Treat a template's injected-class-name as if the template |
| 1291 | // specialization type had been used. |
John McCall | 31f17ec | 2010-04-27 00:57:59 +0000 | [diff] [blame] | 1292 | Param = cast<InjectedClassNameType>(Param) |
| 1293 | ->getInjectedSpecializationType(); |
John McCall | 3cb0ebd | 2010-03-10 03:28:59 +0000 | [diff] [blame] | 1294 | assert(isa<TemplateSpecializationType>(Param) && |
| 1295 | "injected class name is not a template specialization type"); |
| 1296 | // fall through |
| 1297 | } |
| 1298 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1299 | // template-name<T> (where template-name refers to a class template) |
Douglas Gregor | d708c72 | 2009-06-09 16:35:58 +0000 | [diff] [blame] | 1300 | // template-name<i> |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 1301 | // TT<T> |
| 1302 | // TT<i> |
| 1303 | // TT<> |
Douglas Gregor | d708c72 | 2009-06-09 16:35:58 +0000 | [diff] [blame] | 1304 | case Type::TemplateSpecialization: { |
| 1305 | const TemplateSpecializationType *SpecParam |
| 1306 | = cast<TemplateSpecializationType>(Param); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1307 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1308 | // Try to deduce template arguments from the template-id. |
| 1309 | Sema::TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1310 | = DeduceTemplateArguments(S, TemplateParams, SpecParam, Arg, |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1311 | Info, Deduced); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1312 | |
Douglas Gregor | 4a5c15f | 2009-09-30 22:13:51 +0000 | [diff] [blame] | 1313 | if (Result && (TDF & TDF_DerivedClass)) { |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1314 | // C++ [temp.deduct.call]p3b3: |
| 1315 | // If P is a class, and P has the form template-id, then A can be a |
| 1316 | // derived class of the deduced A. Likewise, if P is a pointer to a |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1317 | // class of the form template-id, A can be a pointer to a derived |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1318 | // class pointed to by the deduced A. |
| 1319 | // |
| 1320 | // More importantly: |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1321 | // These alternatives are considered only if type deduction would |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1322 | // otherwise fail. |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1323 | if (const RecordType *RecordT = Arg->getAs<RecordType>()) { |
| 1324 | // We cannot inspect base classes as part of deduction when the type |
| 1325 | // is incomplete, so either instantiate any templates necessary to |
| 1326 | // complete the type, or skip over it if it cannot be completed. |
John McCall | 5769d61 | 2010-02-08 23:07:23 +0000 | [diff] [blame] | 1327 | if (S.RequireCompleteType(Info.getLocation(), Arg, 0)) |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1328 | return Result; |
| 1329 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1330 | // Use data recursion to crawl through the list of base classes. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1331 | // Visited contains the set of nodes we have already visited, while |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1332 | // ToVisit is our stack of records that we still need to visit. |
| 1333 | llvm::SmallPtrSet<const RecordType *, 8> Visited; |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1334 | SmallVector<const RecordType *, 8> ToVisit; |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1335 | ToVisit.push_back(RecordT); |
| 1336 | bool Successful = false; |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1337 | SmallVectorImpl<DeducedTemplateArgument> DeducedOrig(0); |
Douglas Gregor | 053105d | 2010-11-02 00:02:34 +0000 | [diff] [blame] | 1338 | DeducedOrig = Deduced; |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1339 | while (!ToVisit.empty()) { |
| 1340 | // Retrieve the next class in the inheritance hierarchy. |
| 1341 | const RecordType *NextT = ToVisit.back(); |
| 1342 | ToVisit.pop_back(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1343 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1344 | // If we have already seen this type, skip it. |
| 1345 | if (!Visited.insert(NextT)) |
| 1346 | continue; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1347 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1348 | // If this is a base class, try to perform template argument |
| 1349 | // deduction from it. |
| 1350 | if (NextT != RecordT) { |
| 1351 | Sema::TemplateDeductionResult BaseResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1352 | = DeduceTemplateArguments(S, TemplateParams, SpecParam, |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1353 | QualType(NextT, 0), Info, Deduced); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1354 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1355 | // If template argument deduction for this base was successful, |
Douglas Gregor | 053105d | 2010-11-02 00:02:34 +0000 | [diff] [blame] | 1356 | // note that we had some success. Otherwise, ignore any deductions |
| 1357 | // from this base class. |
| 1358 | if (BaseResult == Sema::TDK_Success) { |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1359 | Successful = true; |
Douglas Gregor | 053105d | 2010-11-02 00:02:34 +0000 | [diff] [blame] | 1360 | DeducedOrig = Deduced; |
| 1361 | } |
| 1362 | else |
| 1363 | Deduced = DeducedOrig; |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1364 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1365 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1366 | // Visit base classes |
| 1367 | CXXRecordDecl *Next = cast<CXXRecordDecl>(NextT->getDecl()); |
| 1368 | for (CXXRecordDecl::base_class_iterator Base = Next->bases_begin(), |
| 1369 | BaseEnd = Next->bases_end(); |
Sebastian Redl | 9994a34 | 2009-10-25 17:03:50 +0000 | [diff] [blame] | 1370 | Base != BaseEnd; ++Base) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1371 | assert(Base->getType()->isRecordType() && |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1372 | "Base class that isn't a record?"); |
Ted Kremenek | 6217b80 | 2009-07-29 21:53:49 +0000 | [diff] [blame] | 1373 | ToVisit.push_back(Base->getType()->getAs<RecordType>()); |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1374 | } |
| 1375 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1376 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1377 | if (Successful) |
| 1378 | return Sema::TDK_Success; |
| 1379 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1380 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1381 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1382 | |
Douglas Gregor | de0cb8b | 2009-07-07 23:09:34 +0000 | [diff] [blame] | 1383 | return Result; |
Douglas Gregor | d708c72 | 2009-06-09 16:35:58 +0000 | [diff] [blame] | 1384 | } |
| 1385 | |
Douglas Gregor | 637a409 | 2009-06-10 23:47:09 +0000 | [diff] [blame] | 1386 | // T type::* |
| 1387 | // T T::* |
| 1388 | // T (type::*)() |
| 1389 | // type (T::*)() |
| 1390 | // type (type::*)(T) |
| 1391 | // type (T::*)(T) |
| 1392 | // T (type::*)(T) |
| 1393 | // T (T::*)() |
| 1394 | // T (T::*)(T) |
| 1395 | case Type::MemberPointer: { |
| 1396 | const MemberPointerType *MemPtrParam = cast<MemberPointerType>(Param); |
| 1397 | const MemberPointerType *MemPtrArg = dyn_cast<MemberPointerType>(Arg); |
| 1398 | if (!MemPtrArg) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1399 | return Sema::TDK_NonDeducedMismatch; |
Douglas Gregor | 637a409 | 2009-06-10 23:47:09 +0000 | [diff] [blame] | 1400 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1401 | if (Sema::TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1402 | = DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1403 | MemPtrParam->getPointeeType(), |
| 1404 | MemPtrArg->getPointeeType(), |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1405 | Info, Deduced, |
| 1406 | TDF & TDF_IgnoreQualifiers)) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1407 | return Result; |
| 1408 | |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1409 | return DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1410 | QualType(MemPtrParam->getClass(), 0), |
| 1411 | QualType(MemPtrArg->getClass(), 0), |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1412 | Info, Deduced, 0); |
Douglas Gregor | 637a409 | 2009-06-10 23:47:09 +0000 | [diff] [blame] | 1413 | } |
| 1414 | |
Anders Carlsson | 9a917e4 | 2009-06-12 22:56:54 +0000 | [diff] [blame] | 1415 | // (clang extension) |
| 1416 | // |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1417 | // type(^)(T) |
| 1418 | // T(^)() |
| 1419 | // T(^)(T) |
Anders Carlsson | 859ba50 | 2009-06-12 16:23:10 +0000 | [diff] [blame] | 1420 | case Type::BlockPointer: { |
| 1421 | const BlockPointerType *BlockPtrParam = cast<BlockPointerType>(Param); |
| 1422 | const BlockPointerType *BlockPtrArg = dyn_cast<BlockPointerType>(Arg); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1423 | |
Anders Carlsson | 859ba50 | 2009-06-12 16:23:10 +0000 | [diff] [blame] | 1424 | if (!BlockPtrArg) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1425 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1426 | |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1427 | return DeduceTemplateArguments(S, TemplateParams, |
Anders Carlsson | 859ba50 | 2009-06-12 16:23:10 +0000 | [diff] [blame] | 1428 | BlockPtrParam->getPointeeType(), |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1429 | BlockPtrArg->getPointeeType(), Info, |
Douglas Gregor | 508f1c8 | 2009-06-26 23:10:12 +0000 | [diff] [blame] | 1430 | Deduced, 0); |
Anders Carlsson | 859ba50 | 2009-06-12 16:23:10 +0000 | [diff] [blame] | 1431 | } |
| 1432 | |
Douglas Gregor | 4ac0140 | 2011-06-15 16:02:29 +0000 | [diff] [blame] | 1433 | // (clang extension) |
| 1434 | // |
| 1435 | // T __attribute__(((ext_vector_type(<integral constant>)))) |
| 1436 | case Type::ExtVector: { |
| 1437 | const ExtVectorType *VectorParam = cast<ExtVectorType>(Param); |
| 1438 | if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { |
| 1439 | // Make sure that the vectors have the same number of elements. |
| 1440 | if (VectorParam->getNumElements() != VectorArg->getNumElements()) |
| 1441 | return Sema::TDK_NonDeducedMismatch; |
| 1442 | |
| 1443 | // Perform deduction on the element types. |
| 1444 | return DeduceTemplateArguments(S, TemplateParams, |
| 1445 | VectorParam->getElementType(), |
| 1446 | VectorArg->getElementType(), |
| 1447 | Info, Deduced, |
| 1448 | TDF); |
| 1449 | } |
| 1450 | |
| 1451 | if (const DependentSizedExtVectorType *VectorArg |
| 1452 | = dyn_cast<DependentSizedExtVectorType>(Arg)) { |
| 1453 | // We can't check the number of elements, since the argument has a |
| 1454 | // dependent number of elements. This can only occur during partial |
| 1455 | // ordering. |
| 1456 | |
| 1457 | // Perform deduction on the element types. |
| 1458 | return DeduceTemplateArguments(S, TemplateParams, |
| 1459 | VectorParam->getElementType(), |
| 1460 | VectorArg->getElementType(), |
| 1461 | Info, Deduced, |
| 1462 | TDF); |
| 1463 | } |
| 1464 | |
| 1465 | return Sema::TDK_NonDeducedMismatch; |
| 1466 | } |
| 1467 | |
| 1468 | // (clang extension) |
| 1469 | // |
| 1470 | // T __attribute__(((ext_vector_type(N)))) |
| 1471 | case Type::DependentSizedExtVector: { |
| 1472 | const DependentSizedExtVectorType *VectorParam |
| 1473 | = cast<DependentSizedExtVectorType>(Param); |
| 1474 | |
| 1475 | if (const ExtVectorType *VectorArg = dyn_cast<ExtVectorType>(Arg)) { |
| 1476 | // Perform deduction on the element types. |
| 1477 | if (Sema::TemplateDeductionResult Result |
| 1478 | = DeduceTemplateArguments(S, TemplateParams, |
| 1479 | VectorParam->getElementType(), |
| 1480 | VectorArg->getElementType(), |
| 1481 | Info, Deduced, |
| 1482 | TDF)) |
| 1483 | return Result; |
| 1484 | |
| 1485 | // Perform deduction on the vector size, if we can. |
| 1486 | NonTypeTemplateParmDecl *NTTP |
| 1487 | = getDeducedParameterFromExpr(VectorParam->getSizeExpr()); |
| 1488 | if (!NTTP) |
| 1489 | return Sema::TDK_Success; |
| 1490 | |
| 1491 | llvm::APSInt ArgSize(S.Context.getTypeSize(S.Context.IntTy), false); |
| 1492 | ArgSize = VectorArg->getNumElements(); |
| 1493 | return DeduceNonTypeTemplateArgument(S, NTTP, ArgSize, S.Context.IntTy, |
| 1494 | false, Info, Deduced); |
| 1495 | } |
| 1496 | |
| 1497 | if (const DependentSizedExtVectorType *VectorArg |
| 1498 | = dyn_cast<DependentSizedExtVectorType>(Arg)) { |
| 1499 | // Perform deduction on the element types. |
| 1500 | if (Sema::TemplateDeductionResult Result |
| 1501 | = DeduceTemplateArguments(S, TemplateParams, |
| 1502 | VectorParam->getElementType(), |
| 1503 | VectorArg->getElementType(), |
| 1504 | Info, Deduced, |
| 1505 | TDF)) |
| 1506 | return Result; |
| 1507 | |
| 1508 | // Perform deduction on the vector size, if we can. |
| 1509 | NonTypeTemplateParmDecl *NTTP |
| 1510 | = getDeducedParameterFromExpr(VectorParam->getSizeExpr()); |
| 1511 | if (!NTTP) |
| 1512 | return Sema::TDK_Success; |
| 1513 | |
| 1514 | return DeduceNonTypeTemplateArgument(S, NTTP, VectorArg->getSizeExpr(), |
| 1515 | Info, Deduced); |
| 1516 | } |
| 1517 | |
| 1518 | return Sema::TDK_NonDeducedMismatch; |
| 1519 | } |
| 1520 | |
Douglas Gregor | 637a409 | 2009-06-10 23:47:09 +0000 | [diff] [blame] | 1521 | case Type::TypeOfExpr: |
| 1522 | case Type::TypeOf: |
Douglas Gregor | 4714c12 | 2010-03-31 17:34:00 +0000 | [diff] [blame] | 1523 | case Type::DependentName: |
Douglas Gregor | 4ac0140 | 2011-06-15 16:02:29 +0000 | [diff] [blame] | 1524 | case Type::UnresolvedUsing: |
| 1525 | case Type::Decltype: |
| 1526 | case Type::UnaryTransform: |
| 1527 | case Type::Auto: |
| 1528 | case Type::DependentTemplateSpecialization: |
| 1529 | case Type::PackExpansion: |
Douglas Gregor | 637a409 | 2009-06-10 23:47:09 +0000 | [diff] [blame] | 1530 | // No template argument deduction for these types |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1531 | return Sema::TDK_Success; |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1532 | } |
| 1533 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1534 | return Sema::TDK_Success; |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1535 | } |
| 1536 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1537 | static Sema::TemplateDeductionResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1538 | DeduceTemplateArguments(Sema &S, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1539 | TemplateParameterList *TemplateParams, |
| 1540 | const TemplateArgument &Param, |
Douglas Gregor | 77d6bb9 | 2011-01-11 22:21:24 +0000 | [diff] [blame] | 1541 | TemplateArgument Arg, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 1542 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1543 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { |
Douglas Gregor | 77d6bb9 | 2011-01-11 22:21:24 +0000 | [diff] [blame] | 1544 | // If the template argument is a pack expansion, perform template argument |
| 1545 | // deduction against the pattern of that expansion. This only occurs during |
| 1546 | // partial ordering. |
| 1547 | if (Arg.isPackExpansion()) |
| 1548 | Arg = Arg.getPackExpansionPattern(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1549 | |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1550 | switch (Param.getKind()) { |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1551 | case TemplateArgument::Null: |
David Blaikie | b219cfc | 2011-09-23 05:06:16 +0000 | [diff] [blame] | 1552 | llvm_unreachable("Null template argument in parameter list"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1553 | |
| 1554 | case TemplateArgument::Type: |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 1555 | if (Arg.getKind() == TemplateArgument::Type) |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1556 | return DeduceTemplateArguments(S, TemplateParams, Param.getAsType(), |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 1557 | Arg.getAsType(), Info, Deduced, 0); |
| 1558 | Info.FirstArg = Param; |
| 1559 | Info.SecondArg = Arg; |
| 1560 | return Sema::TDK_NonDeducedMismatch; |
Douglas Gregor | a7fc901 | 2011-01-05 18:58:31 +0000 | [diff] [blame] | 1561 | |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 1562 | case TemplateArgument::Template: |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 1563 | if (Arg.getKind() == TemplateArgument::Template) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1564 | return DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 1565 | Param.getAsTemplate(), |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 1566 | Arg.getAsTemplate(), Info, Deduced); |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 1567 | Info.FirstArg = Param; |
| 1568 | Info.SecondArg = Arg; |
| 1569 | return Sema::TDK_NonDeducedMismatch; |
Douglas Gregor | a7fc901 | 2011-01-05 18:58:31 +0000 | [diff] [blame] | 1570 | |
| 1571 | case TemplateArgument::TemplateExpansion: |
| 1572 | llvm_unreachable("caller should handle pack expansions"); |
| 1573 | break; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1574 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1575 | case TemplateArgument::Declaration: |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 1576 | if (Arg.getKind() == TemplateArgument::Declaration && |
| 1577 | Param.getAsDecl()->getCanonicalDecl() == |
| 1578 | Arg.getAsDecl()->getCanonicalDecl()) |
| 1579 | return Sema::TDK_Success; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1580 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1581 | Info.FirstArg = Param; |
| 1582 | Info.SecondArg = Arg; |
| 1583 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1584 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1585 | case TemplateArgument::Integral: |
| 1586 | if (Arg.getKind() == TemplateArgument::Integral) { |
Douglas Gregor | 9d0e441 | 2010-03-26 05:50:28 +0000 | [diff] [blame] | 1587 | if (hasSameExtendedValue(*Param.getAsIntegral(), *Arg.getAsIntegral())) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1588 | return Sema::TDK_Success; |
| 1589 | |
| 1590 | Info.FirstArg = Param; |
| 1591 | Info.SecondArg = Arg; |
| 1592 | return Sema::TDK_NonDeducedMismatch; |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1593 | } |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1594 | |
| 1595 | if (Arg.getKind() == TemplateArgument::Expression) { |
| 1596 | Info.FirstArg = Param; |
| 1597 | Info.SecondArg = Arg; |
| 1598 | return Sema::TDK_NonDeducedMismatch; |
| 1599 | } |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1600 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1601 | Info.FirstArg = Param; |
| 1602 | Info.SecondArg = Arg; |
| 1603 | return Sema::TDK_NonDeducedMismatch; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1604 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1605 | case TemplateArgument::Expression: { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1606 | if (NonTypeTemplateParmDecl *NTTP |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1607 | = getDeducedParameterFromExpr(Param.getAsExpr())) { |
| 1608 | if (Arg.getKind() == TemplateArgument::Integral) |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1609 | return DeduceNonTypeTemplateArgument(S, NTTP, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1610 | *Arg.getAsIntegral(), |
Douglas Gregor | 9d0e441 | 2010-03-26 05:50:28 +0000 | [diff] [blame] | 1611 | Arg.getIntegralType(), |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 1612 | /*ArrayBound=*/false, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1613 | Info, Deduced); |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1614 | if (Arg.getKind() == TemplateArgument::Expression) |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1615 | return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsExpr(), |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1616 | Info, Deduced); |
Douglas Gregor | 15755cb | 2009-11-13 23:45:44 +0000 | [diff] [blame] | 1617 | if (Arg.getKind() == TemplateArgument::Declaration) |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1618 | return DeduceNonTypeTemplateArgument(S, NTTP, Arg.getAsDecl(), |
Douglas Gregor | 15755cb | 2009-11-13 23:45:44 +0000 | [diff] [blame] | 1619 | Info, Deduced); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1620 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1621 | Info.FirstArg = Param; |
| 1622 | Info.SecondArg = Arg; |
| 1623 | return Sema::TDK_NonDeducedMismatch; |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1624 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1625 | |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1626 | // Can't deduce anything, but that's okay. |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1627 | return Sema::TDK_Success; |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1628 | } |
Anders Carlsson | d01b1da | 2009-06-15 17:04:53 +0000 | [diff] [blame] | 1629 | case TemplateArgument::Pack: |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1630 | llvm_unreachable("Argument packs should be expanded by the caller!"); |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 1631 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1632 | |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1633 | return Sema::TDK_Success; |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1634 | } |
| 1635 | |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1636 | /// \brief Determine whether there is a template argument to be used for |
| 1637 | /// deduction. |
| 1638 | /// |
| 1639 | /// This routine "expands" argument packs in-place, overriding its input |
| 1640 | /// parameters so that \c Args[ArgIdx] will be the available template argument. |
| 1641 | /// |
| 1642 | /// \returns true if there is another template argument (which will be at |
| 1643 | /// \c Args[ArgIdx]), false otherwise. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1644 | static bool hasTemplateArgumentForDeduction(const TemplateArgument *&Args, |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1645 | unsigned &ArgIdx, |
| 1646 | unsigned &NumArgs) { |
| 1647 | if (ArgIdx == NumArgs) |
| 1648 | return false; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1649 | |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1650 | const TemplateArgument &Arg = Args[ArgIdx]; |
| 1651 | if (Arg.getKind() != TemplateArgument::Pack) |
| 1652 | return true; |
| 1653 | |
| 1654 | assert(ArgIdx == NumArgs - 1 && "Pack not at the end of argument list?"); |
| 1655 | Args = Arg.pack_begin(); |
| 1656 | NumArgs = Arg.pack_size(); |
| 1657 | ArgIdx = 0; |
| 1658 | return ArgIdx < NumArgs; |
| 1659 | } |
| 1660 | |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 1661 | /// \brief Determine whether the given set of template arguments has a pack |
| 1662 | /// expansion that is not the last template argument. |
| 1663 | static bool hasPackExpansionBeforeEnd(const TemplateArgument *Args, |
| 1664 | unsigned NumArgs) { |
| 1665 | unsigned ArgIdx = 0; |
| 1666 | while (ArgIdx < NumArgs) { |
| 1667 | const TemplateArgument &Arg = Args[ArgIdx]; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1668 | |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 1669 | // Unwrap argument packs. |
| 1670 | if (Args[ArgIdx].getKind() == TemplateArgument::Pack) { |
| 1671 | Args = Arg.pack_begin(); |
| 1672 | NumArgs = Arg.pack_size(); |
| 1673 | ArgIdx = 0; |
| 1674 | continue; |
| 1675 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1676 | |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 1677 | ++ArgIdx; |
| 1678 | if (ArgIdx == NumArgs) |
| 1679 | return false; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1680 | |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 1681 | if (Arg.isPackExpansion()) |
| 1682 | return true; |
| 1683 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1684 | |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 1685 | return false; |
| 1686 | } |
| 1687 | |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1688 | static Sema::TemplateDeductionResult |
| 1689 | DeduceTemplateArguments(Sema &S, |
| 1690 | TemplateParameterList *TemplateParams, |
| 1691 | const TemplateArgument *Params, unsigned NumParams, |
| 1692 | const TemplateArgument *Args, unsigned NumArgs, |
| 1693 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1694 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
Douglas Gregor | 0972c86 | 2010-12-22 18:55:49 +0000 | [diff] [blame] | 1695 | bool NumberOfArgumentsMustMatch) { |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1696 | // C++0x [temp.deduct.type]p9: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1697 | // If the template argument list of P contains a pack expansion that is not |
| 1698 | // the last template argument, the entire template argument list is a |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1699 | // non-deduced context. |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 1700 | if (hasPackExpansionBeforeEnd(Params, NumParams)) |
| 1701 | return Sema::TDK_Success; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1702 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1703 | // C++0x [temp.deduct.type]p9: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1704 | // If P has a form that contains <T> or <i>, then each argument Pi of the |
| 1705 | // respective template argument list P is compared with the corresponding |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1706 | // argument Ai of the corresponding template argument list of A. |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1707 | unsigned ArgIdx = 0, ParamIdx = 0; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1708 | for (; hasTemplateArgumentForDeduction(Params, ParamIdx, NumParams); |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1709 | ++ParamIdx) { |
| 1710 | if (!Params[ParamIdx].isPackExpansion()) { |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1711 | // The simple case: deduce template arguments by matching Pi and Ai. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1712 | |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1713 | // Check whether we have enough arguments. |
| 1714 | if (!hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) |
Douglas Gregor | 3cae5c9 | 2011-01-10 20:53:55 +0000 | [diff] [blame] | 1715 | return NumberOfArgumentsMustMatch? Sema::TDK_NonDeducedMismatch |
Douglas Gregor | 0972c86 | 2010-12-22 18:55:49 +0000 | [diff] [blame] | 1716 | : Sema::TDK_Success; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1717 | |
Douglas Gregor | 77d6bb9 | 2011-01-11 22:21:24 +0000 | [diff] [blame] | 1718 | if (Args[ArgIdx].isPackExpansion()) { |
| 1719 | // FIXME: We follow the logic of C++0x [temp.deduct.type]p22 here, |
| 1720 | // but applied to pack expansions that are template arguments. |
| 1721 | return Sema::TDK_NonDeducedMismatch; |
| 1722 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1723 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1724 | // Perform deduction for this Pi/Ai pair. |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1725 | if (Sema::TemplateDeductionResult Result |
Douglas Gregor | 77d6bb9 | 2011-01-11 22:21:24 +0000 | [diff] [blame] | 1726 | = DeduceTemplateArguments(S, TemplateParams, |
| 1727 | Params[ParamIdx], Args[ArgIdx], |
| 1728 | Info, Deduced)) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1729 | return Result; |
| 1730 | |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1731 | // Move to the next argument. |
| 1732 | ++ArgIdx; |
| 1733 | continue; |
| 1734 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1735 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1736 | // The parameter is a pack expansion. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1737 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1738 | // C++0x [temp.deduct.type]p9: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1739 | // If Pi is a pack expansion, then the pattern of Pi is compared with |
| 1740 | // each remaining argument in the template argument list of A. Each |
| 1741 | // comparison deduces template arguments for subsequent positions in the |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1742 | // template parameter packs expanded by Pi. |
| 1743 | TemplateArgument Pattern = Params[ParamIdx].getPackExpansionPattern(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1744 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1745 | // Compute the set of template parameter indices that correspond to |
| 1746 | // parameter packs expanded by the pack expansion. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1747 | SmallVector<unsigned, 2> PackIndices; |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1748 | { |
| 1749 | llvm::BitVector SawIndices(TemplateParams->size()); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1750 | SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1751 | S.collectUnexpandedParameterPacks(Pattern, Unexpanded); |
| 1752 | for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { |
| 1753 | unsigned Depth, Index; |
| 1754 | llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); |
| 1755 | if (Depth == 0 && !SawIndices[Index]) { |
| 1756 | SawIndices[Index] = true; |
| 1757 | PackIndices.push_back(Index); |
| 1758 | } |
| 1759 | } |
| 1760 | } |
| 1761 | assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1762 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1763 | // FIXME: If there are no remaining arguments, we can bail out early |
| 1764 | // and set any deduced parameter packs to an empty argument pack. |
| 1765 | // The latter part of this is a (minor) correctness issue. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1766 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1767 | // Save the deduced template arguments for each parameter pack expanded |
| 1768 | // by this pack expansion, then clear out the deduction. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1769 | SmallVector<DeducedTemplateArgument, 2> |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1770 | SavedPacks(PackIndices.size()); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1771 | SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 1772 | NewlyDeducedPacks(PackIndices.size()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1773 | PrepareArgumentPackDeduction(S, Deduced, PackIndices, SavedPacks, |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 1774 | NewlyDeducedPacks); |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1775 | |
| 1776 | // Keep track of the deduced template arguments for each parameter pack |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1777 | // expanded by this pack expansion (the outer index) and for each |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1778 | // template argument (the inner SmallVectors). |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1779 | bool HasAnyArguments = false; |
| 1780 | while (hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) { |
| 1781 | HasAnyArguments = true; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1782 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1783 | // Deduce template arguments from the pattern. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1784 | if (Sema::TemplateDeductionResult Result |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1785 | = DeduceTemplateArguments(S, TemplateParams, Pattern, Args[ArgIdx], |
| 1786 | Info, Deduced)) |
| 1787 | return Result; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1788 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1789 | // Capture the deduced template arguments for each parameter pack expanded |
| 1790 | // by this pack expansion, add them to the list of arguments we've deduced |
| 1791 | // for that pack, then clear out the deduced argument. |
| 1792 | for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { |
| 1793 | DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; |
| 1794 | if (!DeducedArg.isNull()) { |
| 1795 | NewlyDeducedPacks[I].push_back(DeducedArg); |
| 1796 | DeducedArg = DeducedTemplateArgument(); |
| 1797 | } |
| 1798 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1799 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1800 | ++ArgIdx; |
| 1801 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1802 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 1803 | // Build argument packs for each of the parameter packs expanded by this |
| 1804 | // pack expansion. |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 1805 | if (Sema::TemplateDeductionResult Result |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1806 | = FinishArgumentPackDeduction(S, TemplateParams, HasAnyArguments, |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 1807 | Deduced, PackIndices, SavedPacks, |
| 1808 | NewlyDeducedPacks, Info)) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1809 | return Result; |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1810 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1811 | |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1812 | // If there is an argument remaining, then we had too many arguments. |
Douglas Gregor | 0972c86 | 2010-12-22 18:55:49 +0000 | [diff] [blame] | 1813 | if (NumberOfArgumentsMustMatch && |
| 1814 | hasTemplateArgumentForDeduction(Args, ArgIdx, NumArgs)) |
Douglas Gregor | 3cae5c9 | 2011-01-10 20:53:55 +0000 | [diff] [blame] | 1815 | return Sema::TDK_NonDeducedMismatch; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1816 | |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1817 | return Sema::TDK_Success; |
| 1818 | } |
| 1819 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1820 | static Sema::TemplateDeductionResult |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 1821 | DeduceTemplateArguments(Sema &S, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 1822 | TemplateParameterList *TemplateParams, |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1823 | const TemplateArgumentList &ParamList, |
| 1824 | const TemplateArgumentList &ArgList, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 1825 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1826 | SmallVectorImpl<DeducedTemplateArgument> &Deduced) { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1827 | return DeduceTemplateArguments(S, TemplateParams, |
Douglas Gregor | 20a55e2 | 2010-12-22 18:17:10 +0000 | [diff] [blame] | 1828 | ParamList.data(), ParamList.size(), |
| 1829 | ArgList.data(), ArgList.size(), |
| 1830 | Info, Deduced); |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 1831 | } |
| 1832 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1833 | /// \brief Determine whether two template arguments are the same. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1834 | static bool isSameTemplateArg(ASTContext &Context, |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1835 | const TemplateArgument &X, |
| 1836 | const TemplateArgument &Y) { |
| 1837 | if (X.getKind() != Y.getKind()) |
| 1838 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1839 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1840 | switch (X.getKind()) { |
| 1841 | case TemplateArgument::Null: |
David Blaikie | b219cfc | 2011-09-23 05:06:16 +0000 | [diff] [blame] | 1842 | llvm_unreachable("Comparing NULL template argument"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1843 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1844 | case TemplateArgument::Type: |
| 1845 | return Context.getCanonicalType(X.getAsType()) == |
| 1846 | Context.getCanonicalType(Y.getAsType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1847 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1848 | case TemplateArgument::Declaration: |
Argyrios Kyrtzidis | 97fbaa2 | 2009-07-18 00:34:25 +0000 | [diff] [blame] | 1849 | return X.getAsDecl()->getCanonicalDecl() == |
| 1850 | Y.getAsDecl()->getCanonicalDecl(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1851 | |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 1852 | case TemplateArgument::Template: |
Douglas Gregor | a7fc901 | 2011-01-05 18:58:31 +0000 | [diff] [blame] | 1853 | case TemplateArgument::TemplateExpansion: |
| 1854 | return Context.getCanonicalTemplateName( |
| 1855 | X.getAsTemplateOrTemplatePattern()).getAsVoidPointer() == |
| 1856 | Context.getCanonicalTemplateName( |
| 1857 | Y.getAsTemplateOrTemplatePattern()).getAsVoidPointer(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1858 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1859 | case TemplateArgument::Integral: |
| 1860 | return *X.getAsIntegral() == *Y.getAsIntegral(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1861 | |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 1862 | case TemplateArgument::Expression: { |
| 1863 | llvm::FoldingSetNodeID XID, YID; |
| 1864 | X.getAsExpr()->Profile(XID, Context, true); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1865 | Y.getAsExpr()->Profile(YID, Context, true); |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 1866 | return XID == YID; |
| 1867 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1868 | |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1869 | case TemplateArgument::Pack: |
| 1870 | if (X.pack_size() != Y.pack_size()) |
| 1871 | return false; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1872 | |
| 1873 | for (TemplateArgument::pack_iterator XP = X.pack_begin(), |
| 1874 | XPEnd = X.pack_end(), |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1875 | YP = Y.pack_begin(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1876 | XP != XPEnd; ++XP, ++YP) |
Douglas Gregor | f670c8c | 2009-06-26 20:57:09 +0000 | [diff] [blame] | 1877 | if (!isSameTemplateArg(Context, *XP, *YP)) |
| 1878 | return false; |
| 1879 | |
| 1880 | return true; |
| 1881 | } |
| 1882 | |
| 1883 | return false; |
| 1884 | } |
| 1885 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1886 | /// \brief Allocate a TemplateArgumentLoc where all locations have |
| 1887 | /// been initialized to the given location. |
| 1888 | /// |
| 1889 | /// \param S The semantic analysis object. |
| 1890 | /// |
| 1891 | /// \param The template argument we are producing template argument |
| 1892 | /// location information for. |
| 1893 | /// |
| 1894 | /// \param NTTPType For a declaration template argument, the type of |
| 1895 | /// the non-type template parameter that corresponds to this template |
| 1896 | /// argument. |
| 1897 | /// |
| 1898 | /// \param Loc The source location to use for the resulting template |
| 1899 | /// argument. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1900 | static TemplateArgumentLoc |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1901 | getTrivialTemplateArgumentLoc(Sema &S, |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1902 | const TemplateArgument &Arg, |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1903 | QualType NTTPType, |
| 1904 | SourceLocation Loc) { |
| 1905 | switch (Arg.getKind()) { |
| 1906 | case TemplateArgument::Null: |
| 1907 | llvm_unreachable("Can't get a NULL template argument here"); |
| 1908 | break; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1909 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1910 | case TemplateArgument::Type: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1911 | return TemplateArgumentLoc(Arg, |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1912 | S.Context.getTrivialTypeSourceInfo(Arg.getAsType(), Loc)); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1913 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1914 | case TemplateArgument::Declaration: { |
| 1915 | Expr *E |
Douglas Gregor | ba68eca | 2011-01-05 17:40:24 +0000 | [diff] [blame] | 1916 | = S.BuildExpressionFromDeclTemplateArgument(Arg, NTTPType, Loc) |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1917 | .takeAs<Expr>(); |
| 1918 | return TemplateArgumentLoc(TemplateArgument(E), E); |
| 1919 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1920 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1921 | case TemplateArgument::Integral: { |
| 1922 | Expr *E |
Douglas Gregor | ba68eca | 2011-01-05 17:40:24 +0000 | [diff] [blame] | 1923 | = S.BuildExpressionFromIntegralTemplateArgument(Arg, Loc).takeAs<Expr>(); |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1924 | return TemplateArgumentLoc(TemplateArgument(E), E); |
| 1925 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1926 | |
Douglas Gregor | b6744ef | 2011-03-02 17:09:35 +0000 | [diff] [blame] | 1927 | case TemplateArgument::Template: |
| 1928 | case TemplateArgument::TemplateExpansion: { |
| 1929 | NestedNameSpecifierLocBuilder Builder; |
| 1930 | TemplateName Template = Arg.getAsTemplate(); |
| 1931 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) |
| 1932 | Builder.MakeTrivial(S.Context, DTN->getQualifier(), Loc); |
| 1933 | else if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName()) |
| 1934 | Builder.MakeTrivial(S.Context, QTN->getQualifier(), Loc); |
| 1935 | |
| 1936 | if (Arg.getKind() == TemplateArgument::Template) |
| 1937 | return TemplateArgumentLoc(Arg, |
| 1938 | Builder.getWithLocInContext(S.Context), |
| 1939 | Loc); |
| 1940 | |
| 1941 | |
| 1942 | return TemplateArgumentLoc(Arg, Builder.getWithLocInContext(S.Context), |
| 1943 | Loc, Loc); |
| 1944 | } |
Douglas Gregor | a7fc901 | 2011-01-05 18:58:31 +0000 | [diff] [blame] | 1945 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1946 | case TemplateArgument::Expression: |
| 1947 | return TemplateArgumentLoc(Arg, Arg.getAsExpr()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1948 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1949 | case TemplateArgument::Pack: |
| 1950 | return TemplateArgumentLoc(Arg, TemplateArgumentLocInfo()); |
| 1951 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1952 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1953 | return TemplateArgumentLoc(); |
| 1954 | } |
| 1955 | |
| 1956 | |
| 1957 | /// \brief Convert the given deduced template argument and add it to the set of |
| 1958 | /// fully-converted template arguments. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1959 | static bool ConvertDeducedTemplateArgument(Sema &S, NamedDecl *Param, |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1960 | DeducedTemplateArgument Arg, |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1961 | NamedDecl *Template, |
| 1962 | QualType NTTPType, |
Douglas Gregor | 6952f1e | 2011-01-19 20:10:05 +0000 | [diff] [blame] | 1963 | unsigned ArgumentPackIndex, |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1964 | TemplateDeductionInfo &Info, |
| 1965 | bool InFunctionTemplate, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1966 | SmallVectorImpl<TemplateArgument> &Output) { |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1967 | if (Arg.getKind() == TemplateArgument::Pack) { |
| 1968 | // This is a template argument pack, so check each of its arguments against |
| 1969 | // the template parameter. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1970 | SmallVector<TemplateArgument, 2> PackedArgsBuilder; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1971 | for (TemplateArgument::pack_iterator PA = Arg.pack_begin(), |
Douglas Gregor | 135ffa7 | 2011-01-05 21:00:53 +0000 | [diff] [blame] | 1972 | PAEnd = Arg.pack_end(); |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1973 | PA != PAEnd; ++PA) { |
Douglas Gregor | d53e16a | 2011-01-05 20:52:18 +0000 | [diff] [blame] | 1974 | // When converting the deduced template argument, append it to the |
| 1975 | // general output list. We need to do this so that the template argument |
| 1976 | // checking logic has all of the prior template arguments available. |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1977 | DeducedTemplateArgument InnerArg(*PA); |
| 1978 | InnerArg.setDeducedFromArrayBound(Arg.wasDeducedFromArrayBound()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1979 | if (ConvertDeducedTemplateArgument(S, Param, InnerArg, Template, |
Douglas Gregor | 6952f1e | 2011-01-19 20:10:05 +0000 | [diff] [blame] | 1980 | NTTPType, PackedArgsBuilder.size(), |
| 1981 | Info, InFunctionTemplate, Output)) |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1982 | return true; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1983 | |
Douglas Gregor | d53e16a | 2011-01-05 20:52:18 +0000 | [diff] [blame] | 1984 | // Move the converted template argument into our argument pack. |
| 1985 | PackedArgsBuilder.push_back(Output.back()); |
| 1986 | Output.pop_back(); |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1987 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1988 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1989 | // Create the resulting argument pack. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1990 | Output.push_back(TemplateArgument::CreatePackCopy(S.Context, |
Douglas Gregor | 203e6a3 | 2011-01-11 23:09:57 +0000 | [diff] [blame] | 1991 | PackedArgsBuilder.data(), |
| 1992 | PackedArgsBuilder.size())); |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1993 | return false; |
| 1994 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 1995 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 1996 | // Convert the deduced template argument into a template |
| 1997 | // argument that we can check, almost as if the user had written |
| 1998 | // the template argument explicitly. |
| 1999 | TemplateArgumentLoc ArgLoc = getTrivialTemplateArgumentLoc(S, Arg, NTTPType, |
| 2000 | Info.getLocation()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2001 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2002 | // Check the template argument, converting it as necessary. |
| 2003 | return S.CheckTemplateArgument(Param, ArgLoc, |
| 2004 | Template, |
| 2005 | Template->getLocation(), |
| 2006 | Template->getSourceRange().getEnd(), |
Douglas Gregor | 6952f1e | 2011-01-19 20:10:05 +0000 | [diff] [blame] | 2007 | ArgumentPackIndex, |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2008 | Output, |
| 2009 | InFunctionTemplate |
| 2010 | ? (Arg.wasDeducedFromArrayBound() |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2011 | ? Sema::CTAK_DeducedFromArrayBound |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2012 | : Sema::CTAK_Deduced) |
| 2013 | : Sema::CTAK_Specified); |
| 2014 | } |
| 2015 | |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2016 | /// Complete template argument deduction for a class template partial |
| 2017 | /// specialization. |
| 2018 | static Sema::TemplateDeductionResult |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2019 | FinishTemplateArgumentDeduction(Sema &S, |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2020 | ClassTemplatePartialSpecializationDecl *Partial, |
| 2021 | const TemplateArgumentList &TemplateArgs, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2022 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 2023 | TemplateDeductionInfo &Info) { |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2024 | // Trap errors. |
| 2025 | Sema::SFINAETrap Trap(S); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2026 | |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2027 | Sema::ContextRAII SavedContext(S, Partial); |
| 2028 | |
| 2029 | // C++ [temp.deduct.type]p2: |
| 2030 | // [...] or if any template argument remains neither deduced nor |
| 2031 | // explicitly specified, template argument deduction fails. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2032 | SmallVector<TemplateArgument, 4> Builder; |
Douglas Gregor | 033a3ca | 2011-01-04 22:23:38 +0000 | [diff] [blame] | 2033 | TemplateParameterList *PartialParams = Partial->getTemplateParameters(); |
| 2034 | for (unsigned I = 0, N = PartialParams->size(); I != N; ++I) { |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2035 | NamedDecl *Param = PartialParams->getParam(I); |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2036 | if (Deduced[I].isNull()) { |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2037 | Info.Param = makeTemplateParameter(Param); |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2038 | return Sema::TDK_Incomplete; |
| 2039 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2040 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2041 | // We have deduced this argument, so it still needs to be |
| 2042 | // checked and converted. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2043 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2044 | // First, for a non-type template parameter type that is |
| 2045 | // initialized by a declaration, we need the type of the |
| 2046 | // corresponding non-type template parameter. |
| 2047 | QualType NTTPType; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2048 | if (NonTypeTemplateParmDecl *NTTP |
Douglas Gregor | d53e16a | 2011-01-05 20:52:18 +0000 | [diff] [blame] | 2049 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2050 | NTTPType = NTTP->getType(); |
Douglas Gregor | d53e16a | 2011-01-05 20:52:18 +0000 | [diff] [blame] | 2051 | if (NTTPType->isDependentType()) { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2052 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, |
Douglas Gregor | d53e16a | 2011-01-05 20:52:18 +0000 | [diff] [blame] | 2053 | Builder.data(), Builder.size()); |
| 2054 | NTTPType = S.SubstType(NTTPType, |
| 2055 | MultiLevelTemplateArgumentList(TemplateArgs), |
| 2056 | NTTP->getLocation(), |
| 2057 | NTTP->getDeclName()); |
| 2058 | if (NTTPType.isNull()) { |
| 2059 | Info.Param = makeTemplateParameter(Param); |
| 2060 | // FIXME: These template arguments are temporary. Free them! |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2061 | Info.reset(TemplateArgumentList::CreateCopy(S.Context, |
| 2062 | Builder.data(), |
Douglas Gregor | d53e16a | 2011-01-05 20:52:18 +0000 | [diff] [blame] | 2063 | Builder.size())); |
| 2064 | return Sema::TDK_SubstitutionFailure; |
| 2065 | } |
| 2066 | } |
| 2067 | } |
| 2068 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2069 | if (ConvertDeducedTemplateArgument(S, Param, Deduced[I], |
Douglas Gregor | 6952f1e | 2011-01-19 20:10:05 +0000 | [diff] [blame] | 2070 | Partial, NTTPType, 0, Info, false, |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2071 | Builder)) { |
| 2072 | Info.Param = makeTemplateParameter(Param); |
| 2073 | // FIXME: These template arguments are temporary. Free them! |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2074 | Info.reset(TemplateArgumentList::CreateCopy(S.Context, Builder.data(), |
| 2075 | Builder.size())); |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2076 | return Sema::TDK_SubstitutionFailure; |
| 2077 | } |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2078 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2079 | |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2080 | // Form the template argument list from the deduced template arguments. |
| 2081 | TemplateArgumentList *DeducedArgumentList |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2082 | = TemplateArgumentList::CreateCopy(S.Context, Builder.data(), |
Douglas Gregor | 910f800 | 2010-11-07 23:05:16 +0000 | [diff] [blame] | 2083 | Builder.size()); |
| 2084 | |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2085 | Info.reset(DeducedArgumentList); |
| 2086 | |
| 2087 | // Substitute the deduced template arguments into the template |
| 2088 | // arguments of the class template partial specialization, and |
| 2089 | // verify that the instantiated template arguments are both valid |
| 2090 | // and are equivalent to the template arguments originally provided |
| 2091 | // to the class template. |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 2092 | LocalInstantiationScope InstScope(S); |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2093 | ClassTemplateDecl *ClassTemplate = Partial->getSpecializedTemplate(); |
| 2094 | const TemplateArgumentLoc *PartialTemplateArgs |
| 2095 | = Partial->getTemplateArgsAsWritten(); |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2096 | |
| 2097 | // Note that we don't provide the langle and rangle locations. |
| 2098 | TemplateArgumentListInfo InstArgs; |
| 2099 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 2100 | if (S.Subst(PartialTemplateArgs, |
| 2101 | Partial->getNumTemplateArgsAsWritten(), |
| 2102 | InstArgs, MultiLevelTemplateArgumentList(*DeducedArgumentList))) { |
| 2103 | unsigned ArgIdx = InstArgs.size(), ParamIdx = ArgIdx; |
| 2104 | if (ParamIdx >= Partial->getTemplateParameters()->size()) |
| 2105 | ParamIdx = Partial->getTemplateParameters()->size() - 1; |
| 2106 | |
| 2107 | Decl *Param |
| 2108 | = const_cast<NamedDecl *>( |
| 2109 | Partial->getTemplateParameters()->getParam(ParamIdx)); |
| 2110 | Info.Param = makeTemplateParameter(Param); |
| 2111 | Info.FirstArg = PartialTemplateArgs[ArgIdx].getArgument(); |
| 2112 | return Sema::TDK_SubstitutionFailure; |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2113 | } |
| 2114 | |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2115 | SmallVector<TemplateArgument, 4> ConvertedInstArgs; |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2116 | if (S.CheckTemplateArgumentList(ClassTemplate, Partial->getLocation(), |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2117 | InstArgs, false, ConvertedInstArgs)) |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2118 | return Sema::TDK_SubstitutionFailure; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2119 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2120 | TemplateParameterList *TemplateParams |
| 2121 | = ClassTemplate->getTemplateParameters(); |
| 2122 | for (unsigned I = 0, E = TemplateParams->size(); I != E; ++I) { |
Douglas Gregor | 910f800 | 2010-11-07 23:05:16 +0000 | [diff] [blame] | 2123 | TemplateArgument InstArg = ConvertedInstArgs.data()[I]; |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2124 | if (!isSameTemplateArg(S.Context, TemplateArgs[I], InstArg)) { |
Douglas Gregor | 2fdc5e8 | 2011-01-05 00:13:17 +0000 | [diff] [blame] | 2125 | Info.Param = makeTemplateParameter(TemplateParams->getParam(I)); |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2126 | Info.FirstArg = TemplateArgs[I]; |
| 2127 | Info.SecondArg = InstArg; |
| 2128 | return Sema::TDK_NonDeducedMismatch; |
| 2129 | } |
| 2130 | } |
| 2131 | |
| 2132 | if (Trap.hasErrorOccurred()) |
| 2133 | return Sema::TDK_SubstitutionFailure; |
| 2134 | |
| 2135 | return Sema::TDK_Success; |
| 2136 | } |
| 2137 | |
Douglas Gregor | c1efb3f | 2009-06-12 22:31:52 +0000 | [diff] [blame] | 2138 | /// \brief Perform template argument deduction to determine whether |
| 2139 | /// the given template arguments match the given class template |
| 2140 | /// partial specialization per C++ [temp.class.spec.match]. |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 2141 | Sema::TemplateDeductionResult |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 2142 | Sema::DeduceTemplateArguments(ClassTemplatePartialSpecializationDecl *Partial, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 2143 | const TemplateArgumentList &TemplateArgs, |
| 2144 | TemplateDeductionInfo &Info) { |
Douglas Gregor | c1efb3f | 2009-06-12 22:31:52 +0000 | [diff] [blame] | 2145 | // C++ [temp.class.spec.match]p2: |
| 2146 | // A partial specialization matches a given actual template |
| 2147 | // argument list if the template arguments of the partial |
| 2148 | // specialization can be deduced from the actual template argument |
| 2149 | // list (14.8.2). |
Douglas Gregor | bb26041 | 2009-06-14 08:02:22 +0000 | [diff] [blame] | 2150 | SFINAETrap Trap(*this); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2151 | SmallVector<DeducedTemplateArgument, 4> Deduced; |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 2152 | Deduced.resize(Partial->getTemplateParameters()->size()); |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 2153 | if (TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 2154 | = ::DeduceTemplateArguments(*this, |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 2155 | Partial->getTemplateParameters(), |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2156 | Partial->getTemplateArgs(), |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 2157 | TemplateArgs, Info, Deduced)) |
| 2158 | return Result; |
Douglas Gregor | 637a409 | 2009-06-10 23:47:09 +0000 | [diff] [blame] | 2159 | |
Douglas Gregor | 637a409 | 2009-06-10 23:47:09 +0000 | [diff] [blame] | 2160 | InstantiatingTemplate Inst(*this, Partial->getLocation(), Partial, |
Douglas Gregor | 9b62363 | 2010-10-12 23:32:35 +0000 | [diff] [blame] | 2161 | Deduced.data(), Deduced.size(), Info); |
Douglas Gregor | 637a409 | 2009-06-10 23:47:09 +0000 | [diff] [blame] | 2162 | if (Inst) |
Douglas Gregor | f67875d | 2009-06-12 18:26:56 +0000 | [diff] [blame] | 2163 | return TDK_InstantiationDepth; |
Douglas Gregor | 199d991 | 2009-06-05 00:53:49 +0000 | [diff] [blame] | 2164 | |
Douglas Gregor | bb26041 | 2009-06-14 08:02:22 +0000 | [diff] [blame] | 2165 | if (Trap.hasErrorOccurred()) |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2166 | return Sema::TDK_SubstitutionFailure; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2167 | |
| 2168 | return ::FinishTemplateArgumentDeduction(*this, Partial, TemplateArgs, |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 2169 | Deduced, Info); |
Douglas Gregor | 0b9247f | 2009-06-04 00:03:07 +0000 | [diff] [blame] | 2170 | } |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 2171 | |
Douglas Gregor | 4112877 | 2009-06-26 23:27:24 +0000 | [diff] [blame] | 2172 | /// \brief Determine whether the given type T is a simple-template-id type. |
| 2173 | static bool isSimpleTemplateIdType(QualType T) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2174 | if (const TemplateSpecializationType *Spec |
John McCall | 183700f | 2009-09-21 23:43:11 +0000 | [diff] [blame] | 2175 | = T->getAs<TemplateSpecializationType>()) |
Douglas Gregor | 4112877 | 2009-06-26 23:27:24 +0000 | [diff] [blame] | 2176 | return Spec->getTemplateName().getAsTemplateDecl() != 0; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2177 | |
Douglas Gregor | 4112877 | 2009-06-26 23:27:24 +0000 | [diff] [blame] | 2178 | return false; |
| 2179 | } |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2180 | |
| 2181 | /// \brief Substitute the explicitly-provided template arguments into the |
| 2182 | /// given function template according to C++ [temp.arg.explicit]. |
| 2183 | /// |
| 2184 | /// \param FunctionTemplate the function template into which the explicit |
| 2185 | /// template arguments will be substituted. |
| 2186 | /// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2187 | /// \param ExplicitTemplateArguments the explicitly-specified template |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2188 | /// arguments. |
| 2189 | /// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2190 | /// \param Deduced the deduced template arguments, which will be populated |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2191 | /// with the converted and checked explicit template arguments. |
| 2192 | /// |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2193 | /// \param ParamTypes will be populated with the instantiated function |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2194 | /// parameters. |
| 2195 | /// |
| 2196 | /// \param FunctionType if non-NULL, the result type of the function template |
| 2197 | /// will also be instantiated and the pointed-to value will be updated with |
| 2198 | /// the instantiated function type. |
| 2199 | /// |
| 2200 | /// \param Info if substitution fails for any reason, this object will be |
| 2201 | /// populated with more information about the failure. |
| 2202 | /// |
| 2203 | /// \returns TDK_Success if substitution was successful, or some failure |
| 2204 | /// condition. |
| 2205 | Sema::TemplateDeductionResult |
| 2206 | Sema::SubstituteExplicitTemplateArguments( |
| 2207 | FunctionTemplateDecl *FunctionTemplate, |
Douglas Gregor | 6771423 | 2011-03-03 02:41:12 +0000 | [diff] [blame] | 2208 | TemplateArgumentListInfo &ExplicitTemplateArgs, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2209 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
| 2210 | SmallVectorImpl<QualType> &ParamTypes, |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2211 | QualType *FunctionType, |
| 2212 | TemplateDeductionInfo &Info) { |
| 2213 | FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); |
| 2214 | TemplateParameterList *TemplateParams |
| 2215 | = FunctionTemplate->getTemplateParameters(); |
| 2216 | |
John McCall | d5532b6 | 2009-11-23 01:53:49 +0000 | [diff] [blame] | 2217 | if (ExplicitTemplateArgs.size() == 0) { |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2218 | // No arguments to substitute; just copy over the parameter types and |
| 2219 | // fill in the function type. |
| 2220 | for (FunctionDecl::param_iterator P = Function->param_begin(), |
| 2221 | PEnd = Function->param_end(); |
| 2222 | P != PEnd; |
| 2223 | ++P) |
| 2224 | ParamTypes.push_back((*P)->getType()); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2225 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2226 | if (FunctionType) |
| 2227 | *FunctionType = Function->getType(); |
| 2228 | return TDK_Success; |
| 2229 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2230 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2231 | // Substitution of the explicit template arguments into a function template |
| 2232 | /// is a SFINAE context. Trap any errors that might occur. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2233 | SFINAETrap Trap(*this); |
| 2234 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2235 | // C++ [temp.arg.explicit]p3: |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2236 | // Template arguments that are present shall be specified in the |
| 2237 | // declaration order of their corresponding template-parameters. The |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2238 | // template argument list shall not specify more template-arguments than |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2239 | // there are corresponding template-parameters. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2240 | SmallVector<TemplateArgument, 4> Builder; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2241 | |
| 2242 | // Enter a new template instantiation context where we check the |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2243 | // explicitly-specified template arguments against this function template, |
| 2244 | // and then substitute them into the function parameter types. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2245 | InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2246 | FunctionTemplate, Deduced.data(), Deduced.size(), |
Douglas Gregor | 9b62363 | 2010-10-12 23:32:35 +0000 | [diff] [blame] | 2247 | ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution, |
| 2248 | Info); |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2249 | if (Inst) |
| 2250 | return TDK_InstantiationDepth; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2251 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2252 | if (CheckTemplateArgumentList(FunctionTemplate, |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2253 | SourceLocation(), |
John McCall | d5532b6 | 2009-11-23 01:53:49 +0000 | [diff] [blame] | 2254 | ExplicitTemplateArgs, |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2255 | true, |
Douglas Gregor | f1a8445 | 2010-05-08 19:15:54 +0000 | [diff] [blame] | 2256 | Builder) || Trap.hasErrorOccurred()) { |
Douglas Gregor | 910f800 | 2010-11-07 23:05:16 +0000 | [diff] [blame] | 2257 | unsigned Index = Builder.size(); |
Douglas Gregor | fe52c91 | 2010-05-09 01:26:06 +0000 | [diff] [blame] | 2258 | if (Index >= TemplateParams->size()) |
| 2259 | Index = TemplateParams->size() - 1; |
| 2260 | Info.Param = makeTemplateParameter(TemplateParams->getParam(Index)); |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2261 | return TDK_InvalidExplicitArguments; |
Douglas Gregor | f1a8445 | 2010-05-08 19:15:54 +0000 | [diff] [blame] | 2262 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2263 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2264 | // Form the template argument list from the explicitly-specified |
| 2265 | // template arguments. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2266 | TemplateArgumentList *ExplicitArgumentList |
Douglas Gregor | 910f800 | 2010-11-07 23:05:16 +0000 | [diff] [blame] | 2267 | = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2268 | Info.reset(ExplicitArgumentList); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2269 | |
John McCall | df41f18 | 2010-10-12 19:40:14 +0000 | [diff] [blame] | 2270 | // Template argument deduction and the final substitution should be |
| 2271 | // done in the context of the templated declaration. Explicit |
| 2272 | // argument substitution, on the other hand, needs to happen in the |
| 2273 | // calling context. |
| 2274 | ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); |
| 2275 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2276 | // If we deduced template arguments for a template parameter pack, |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 2277 | // note that the template argument pack is partially substituted and record |
| 2278 | // the explicit template arguments. They'll be used as part of deduction |
| 2279 | // for this template parameter pack. |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 2280 | for (unsigned I = 0, N = Builder.size(); I != N; ++I) { |
| 2281 | const TemplateArgument &Arg = Builder[I]; |
| 2282 | if (Arg.getKind() == TemplateArgument::Pack) { |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 2283 | CurrentInstantiationScope->SetPartiallySubstitutedPack( |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2284 | TemplateParams->getParam(I), |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 2285 | Arg.pack_begin(), |
| 2286 | Arg.pack_size()); |
| 2287 | break; |
| 2288 | } |
| 2289 | } |
| 2290 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2291 | // Instantiate the types of each of the function parameters given the |
| 2292 | // explicitly-specified template arguments. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2293 | if (SubstParmTypes(Function->getLocation(), |
Douglas Gregor | a009b59 | 2011-01-07 00:20:55 +0000 | [diff] [blame] | 2294 | Function->param_begin(), Function->getNumParams(), |
| 2295 | MultiLevelTemplateArgumentList(*ExplicitArgumentList), |
| 2296 | ParamTypes)) |
| 2297 | return TDK_SubstitutionFailure; |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2298 | |
| 2299 | // If the caller wants a full function type back, instantiate the return |
| 2300 | // type and form that function type. |
| 2301 | if (FunctionType) { |
| 2302 | // FIXME: exception-specifications? |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2303 | const FunctionProtoType *Proto |
John McCall | 183700f | 2009-09-21 23:43:11 +0000 | [diff] [blame] | 2304 | = Function->getType()->getAs<FunctionProtoType>(); |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2305 | assert(Proto && "Function template does not have a prototype?"); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2306 | |
| 2307 | QualType ResultType |
Douglas Gregor | 357bbd0 | 2009-08-28 20:50:45 +0000 | [diff] [blame] | 2308 | = SubstType(Proto->getResultType(), |
| 2309 | MultiLevelTemplateArgumentList(*ExplicitArgumentList), |
| 2310 | Function->getTypeSpecStartLoc(), |
| 2311 | Function->getDeclName()); |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2312 | if (ResultType.isNull() || Trap.hasErrorOccurred()) |
| 2313 | return TDK_SubstitutionFailure; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2314 | |
| 2315 | *FunctionType = BuildFunctionType(ResultType, |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2316 | ParamTypes.data(), ParamTypes.size(), |
| 2317 | Proto->isVariadic(), |
| 2318 | Proto->getTypeQuals(), |
Douglas Gregor | c938c16 | 2011-01-26 05:01:58 +0000 | [diff] [blame] | 2319 | Proto->getRefQualifier(), |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2320 | Function->getLocation(), |
Eli Friedman | fa86954 | 2010-08-05 02:54:05 +0000 | [diff] [blame] | 2321 | Function->getDeclName(), |
| 2322 | Proto->getExtInfo()); |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2323 | if (FunctionType->isNull() || Trap.hasErrorOccurred()) |
| 2324 | return TDK_SubstitutionFailure; |
| 2325 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2326 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2327 | // C++ [temp.arg.explicit]p2: |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2328 | // Trailing template arguments that can be deduced (14.8.2) may be |
| 2329 | // omitted from the list of explicit template-arguments. If all of the |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2330 | // template arguments can be deduced, they may all be omitted; in this |
| 2331 | // case, the empty template argument list <> itself may also be omitted. |
| 2332 | // |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 2333 | // Take all of the explicitly-specified arguments and put them into |
| 2334 | // the set of deduced template arguments. Explicitly-specified |
| 2335 | // parameter packs, however, will be set to NULL since the deduction |
| 2336 | // mechanisms handle explicitly-specified argument packs directly. |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2337 | Deduced.reserve(TemplateParams->size()); |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 2338 | for (unsigned I = 0, N = ExplicitArgumentList->size(); I != N; ++I) { |
| 2339 | const TemplateArgument &Arg = ExplicitArgumentList->get(I); |
| 2340 | if (Arg.getKind() == TemplateArgument::Pack) |
| 2341 | Deduced.push_back(DeducedTemplateArgument()); |
| 2342 | else |
| 2343 | Deduced.push_back(Arg); |
| 2344 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2345 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2346 | return TDK_Success; |
| 2347 | } |
| 2348 | |
Douglas Gregor | b7edc4f | 2011-06-17 05:18:17 +0000 | [diff] [blame] | 2349 | /// \brief Check whether the deduced argument type for a call to a function |
| 2350 | /// template matches the actual argument type per C++ [temp.deduct.call]p4. |
| 2351 | static bool |
| 2352 | CheckOriginalCallArgDeduction(Sema &S, Sema::OriginalCallArg OriginalArg, |
| 2353 | QualType DeducedA) { |
| 2354 | ASTContext &Context = S.Context; |
| 2355 | |
| 2356 | QualType A = OriginalArg.OriginalArgType; |
| 2357 | QualType OriginalParamType = OriginalArg.OriginalParamType; |
| 2358 | |
| 2359 | // Check for type equality (top-level cv-qualifiers are ignored). |
| 2360 | if (Context.hasSameUnqualifiedType(A, DeducedA)) |
| 2361 | return false; |
| 2362 | |
| 2363 | // Strip off references on the argument types; they aren't needed for |
| 2364 | // the following checks. |
| 2365 | if (const ReferenceType *DeducedARef = DeducedA->getAs<ReferenceType>()) |
| 2366 | DeducedA = DeducedARef->getPointeeType(); |
| 2367 | if (const ReferenceType *ARef = A->getAs<ReferenceType>()) |
| 2368 | A = ARef->getPointeeType(); |
| 2369 | |
| 2370 | // C++ [temp.deduct.call]p4: |
| 2371 | // [...] However, there are three cases that allow a difference: |
| 2372 | // - If the original P is a reference type, the deduced A (i.e., the |
| 2373 | // type referred to by the reference) can be more cv-qualified than |
| 2374 | // the transformed A. |
| 2375 | if (const ReferenceType *OriginalParamRef |
| 2376 | = OriginalParamType->getAs<ReferenceType>()) { |
| 2377 | // We don't want to keep the reference around any more. |
| 2378 | OriginalParamType = OriginalParamRef->getPointeeType(); |
| 2379 | |
| 2380 | Qualifiers AQuals = A.getQualifiers(); |
| 2381 | Qualifiers DeducedAQuals = DeducedA.getQualifiers(); |
| 2382 | if (AQuals == DeducedAQuals) { |
| 2383 | // Qualifiers match; there's nothing to do. |
| 2384 | } else if (!DeducedAQuals.compatiblyIncludes(AQuals)) { |
Douglas Gregor | c99f0ec | 2011-06-17 14:36:00 +0000 | [diff] [blame] | 2385 | return true; |
Douglas Gregor | b7edc4f | 2011-06-17 05:18:17 +0000 | [diff] [blame] | 2386 | } else { |
| 2387 | // Qualifiers are compatible, so have the argument type adopt the |
| 2388 | // deduced argument type's qualifiers as if we had performed the |
| 2389 | // qualification conversion. |
| 2390 | A = Context.getQualifiedType(A.getUnqualifiedType(), DeducedAQuals); |
| 2391 | } |
| 2392 | } |
| 2393 | |
| 2394 | // - The transformed A can be another pointer or pointer to member |
| 2395 | // type that can be converted to the deduced A via a qualification |
| 2396 | // conversion. |
Chandler Carruth | 18e0461 | 2011-06-18 01:19:03 +0000 | [diff] [blame] | 2397 | // |
| 2398 | // Also allow conversions which merely strip [[noreturn]] from function types |
| 2399 | // (recursively) as an extension. |
| 2400 | // FIXME: Currently, this doesn't place nicely with qualfication conversions. |
Douglas Gregor | b7edc4f | 2011-06-17 05:18:17 +0000 | [diff] [blame] | 2401 | bool ObjCLifetimeConversion = false; |
Chandler Carruth | 18e0461 | 2011-06-18 01:19:03 +0000 | [diff] [blame] | 2402 | QualType ResultTy; |
Douglas Gregor | b7edc4f | 2011-06-17 05:18:17 +0000 | [diff] [blame] | 2403 | if ((A->isAnyPointerType() || A->isMemberPointerType()) && |
Chandler Carruth | 18e0461 | 2011-06-18 01:19:03 +0000 | [diff] [blame] | 2404 | (S.IsQualificationConversion(A, DeducedA, false, |
| 2405 | ObjCLifetimeConversion) || |
| 2406 | S.IsNoReturnConversion(A, DeducedA, ResultTy))) |
Douglas Gregor | b7edc4f | 2011-06-17 05:18:17 +0000 | [diff] [blame] | 2407 | return false; |
| 2408 | |
| 2409 | |
| 2410 | // - If P is a class and P has the form simple-template-id, then the |
| 2411 | // transformed A can be a derived class of the deduced A. [...] |
| 2412 | // [...] Likewise, if P is a pointer to a class of the form |
| 2413 | // simple-template-id, the transformed A can be a pointer to a |
| 2414 | // derived class pointed to by the deduced A. |
| 2415 | if (const PointerType *OriginalParamPtr |
| 2416 | = OriginalParamType->getAs<PointerType>()) { |
| 2417 | if (const PointerType *DeducedAPtr = DeducedA->getAs<PointerType>()) { |
| 2418 | if (const PointerType *APtr = A->getAs<PointerType>()) { |
| 2419 | if (A->getPointeeType()->isRecordType()) { |
| 2420 | OriginalParamType = OriginalParamPtr->getPointeeType(); |
| 2421 | DeducedA = DeducedAPtr->getPointeeType(); |
| 2422 | A = APtr->getPointeeType(); |
| 2423 | } |
| 2424 | } |
| 2425 | } |
| 2426 | } |
| 2427 | |
| 2428 | if (Context.hasSameUnqualifiedType(A, DeducedA)) |
| 2429 | return false; |
| 2430 | |
| 2431 | if (A->isRecordType() && isSimpleTemplateIdType(OriginalParamType) && |
| 2432 | S.IsDerivedFrom(A, DeducedA)) |
| 2433 | return false; |
| 2434 | |
| 2435 | return true; |
| 2436 | } |
| 2437 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2438 | /// \brief Finish template argument deduction for a function template, |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2439 | /// checking the deduced template arguments for completeness and forming |
| 2440 | /// the function template specialization. |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2441 | /// |
| 2442 | /// \param OriginalCallArgs If non-NULL, the original call arguments against |
| 2443 | /// which the deduced argument types should be compared. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2444 | Sema::TemplateDeductionResult |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2445 | Sema::FinishTemplateArgumentDeduction(FunctionTemplateDecl *FunctionTemplate, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2446 | SmallVectorImpl<DeducedTemplateArgument> &Deduced, |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 2447 | unsigned NumExplicitlySpecified, |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2448 | FunctionDecl *&Specialization, |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2449 | TemplateDeductionInfo &Info, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2450 | SmallVectorImpl<OriginalCallArg> const *OriginalCallArgs) { |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2451 | TemplateParameterList *TemplateParams |
| 2452 | = FunctionTemplate->getTemplateParameters(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2453 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2454 | // Template argument deduction for function templates in a SFINAE context. |
| 2455 | // Trap any errors that might occur. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2456 | SFINAETrap Trap(*this); |
| 2457 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2458 | // Enter a new template instantiation context while we instantiate the |
| 2459 | // actual function declaration. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2460 | InstantiatingTemplate Inst(*this, FunctionTemplate->getLocation(), |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2461 | FunctionTemplate, Deduced.data(), Deduced.size(), |
Douglas Gregor | 9b62363 | 2010-10-12 23:32:35 +0000 | [diff] [blame] | 2462 | ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution, |
| 2463 | Info); |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2464 | if (Inst) |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2465 | return TDK_InstantiationDepth; |
| 2466 | |
John McCall | 96db310 | 2010-04-29 01:18:58 +0000 | [diff] [blame] | 2467 | ContextRAII SavedContext(*this, FunctionTemplate->getTemplatedDecl()); |
John McCall | f581382 | 2010-04-29 00:35:03 +0000 | [diff] [blame] | 2468 | |
Douglas Gregor | 51ffb0c | 2009-11-25 18:55:14 +0000 | [diff] [blame] | 2469 | // C++ [temp.deduct.type]p2: |
| 2470 | // [...] or if any template argument remains neither deduced nor |
| 2471 | // explicitly specified, template argument deduction fails. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2472 | SmallVector<TemplateArgument, 4> Builder; |
Douglas Gregor | b9a7d6f | 2011-01-04 22:13:36 +0000 | [diff] [blame] | 2473 | for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { |
| 2474 | NamedDecl *Param = TemplateParams->getParam(I); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2475 | |
Douglas Gregor | 51ffb0c | 2009-11-25 18:55:14 +0000 | [diff] [blame] | 2476 | if (!Deduced[I].isNull()) { |
Douglas Gregor | 3273b0c | 2010-10-12 18:51:08 +0000 | [diff] [blame] | 2477 | if (I < NumExplicitlySpecified) { |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 2478 | // We have already fully type-checked and converted this |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2479 | // argument, because it was explicitly-specified. Just record the |
Douglas Gregor | 3273b0c | 2010-10-12 18:51:08 +0000 | [diff] [blame] | 2480 | // presence of this argument. |
Douglas Gregor | 910f800 | 2010-11-07 23:05:16 +0000 | [diff] [blame] | 2481 | Builder.push_back(Deduced[I]); |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 2482 | continue; |
| 2483 | } |
| 2484 | |
| 2485 | // We have deduced this argument, so it still needs to be |
| 2486 | // checked and converted. |
| 2487 | |
| 2488 | // First, for a non-type template parameter type that is |
| 2489 | // initialized by a declaration, we need the type of the |
| 2490 | // corresponding non-type template parameter. |
| 2491 | QualType NTTPType; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2492 | if (NonTypeTemplateParmDecl *NTTP |
| 2493 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
Douglas Gregor | b9a7d6f | 2011-01-04 22:13:36 +0000 | [diff] [blame] | 2494 | NTTPType = NTTP->getType(); |
| 2495 | if (NTTPType->isDependentType()) { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2496 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, |
Douglas Gregor | b9a7d6f | 2011-01-04 22:13:36 +0000 | [diff] [blame] | 2497 | Builder.data(), Builder.size()); |
| 2498 | NTTPType = SubstType(NTTPType, |
| 2499 | MultiLevelTemplateArgumentList(TemplateArgs), |
| 2500 | NTTP->getLocation(), |
| 2501 | NTTP->getDeclName()); |
| 2502 | if (NTTPType.isNull()) { |
| 2503 | Info.Param = makeTemplateParameter(Param); |
| 2504 | // FIXME: These template arguments are temporary. Free them! |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2505 | Info.reset(TemplateArgumentList::CreateCopy(Context, |
| 2506 | Builder.data(), |
Douglas Gregor | b9a7d6f | 2011-01-04 22:13:36 +0000 | [diff] [blame] | 2507 | Builder.size())); |
| 2508 | return TDK_SubstitutionFailure; |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 2509 | } |
| 2510 | } |
| 2511 | } |
| 2512 | |
Douglas Gregor | b9a7d6f | 2011-01-04 22:13:36 +0000 | [diff] [blame] | 2513 | if (ConvertDeducedTemplateArgument(*this, Param, Deduced[I], |
Douglas Gregor | 6952f1e | 2011-01-19 20:10:05 +0000 | [diff] [blame] | 2514 | FunctionTemplate, NTTPType, 0, Info, |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 2515 | true, Builder)) { |
Douglas Gregor | b9a7d6f | 2011-01-04 22:13:36 +0000 | [diff] [blame] | 2516 | Info.Param = makeTemplateParameter(Param); |
Douglas Gregor | 910f800 | 2010-11-07 23:05:16 +0000 | [diff] [blame] | 2517 | // FIXME: These template arguments are temporary. Free them! |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2518 | Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), |
| 2519 | Builder.size())); |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 2520 | return TDK_SubstitutionFailure; |
| 2521 | } |
| 2522 | |
Douglas Gregor | 51ffb0c | 2009-11-25 18:55:14 +0000 | [diff] [blame] | 2523 | continue; |
| 2524 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2525 | |
Douglas Gregor | ea6c96f | 2010-12-23 01:52:01 +0000 | [diff] [blame] | 2526 | // C++0x [temp.arg.explicit]p3: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2527 | // A trailing template parameter pack (14.5.3) not otherwise deduced will |
Douglas Gregor | ea6c96f | 2010-12-23 01:52:01 +0000 | [diff] [blame] | 2528 | // be deduced to an empty sequence of template arguments. |
| 2529 | // FIXME: Where did the word "trailing" come from? |
| 2530 | if (Param->isTemplateParameterPack()) { |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 2531 | // We may have had explicitly-specified template arguments for this |
| 2532 | // template parameter pack. If so, our empty deduction extends the |
| 2533 | // explicitly-specified set (C++0x [temp.arg.explicit]p9). |
| 2534 | const TemplateArgument *ExplicitArgs; |
| 2535 | unsigned NumExplicitArgs; |
| 2536 | if (CurrentInstantiationScope->getPartiallySubstitutedPack(&ExplicitArgs, |
| 2537 | &NumExplicitArgs) |
| 2538 | == Param) |
| 2539 | Builder.push_back(TemplateArgument(ExplicitArgs, NumExplicitArgs)); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2540 | else |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 2541 | Builder.push_back(TemplateArgument(0, 0)); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2542 | |
Douglas Gregor | ea6c96f | 2010-12-23 01:52:01 +0000 | [diff] [blame] | 2543 | continue; |
| 2544 | } |
Douglas Gregor | 51ffb0c | 2009-11-25 18:55:14 +0000 | [diff] [blame] | 2545 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2546 | // Substitute into the default template argument, if available. |
Douglas Gregor | 51ffb0c | 2009-11-25 18:55:14 +0000 | [diff] [blame] | 2547 | TemplateArgumentLoc DefArg |
| 2548 | = SubstDefaultTemplateArgumentIfAvailable(FunctionTemplate, |
| 2549 | FunctionTemplate->getLocation(), |
| 2550 | FunctionTemplate->getSourceRange().getEnd(), |
| 2551 | Param, |
| 2552 | Builder); |
| 2553 | |
| 2554 | // If there was no default argument, deduction is incomplete. |
| 2555 | if (DefArg.getArgument().isNull()) { |
| 2556 | Info.Param = makeTemplateParameter( |
| 2557 | const_cast<NamedDecl *>(TemplateParams->getParam(I))); |
| 2558 | return TDK_Incomplete; |
| 2559 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2560 | |
Douglas Gregor | 51ffb0c | 2009-11-25 18:55:14 +0000 | [diff] [blame] | 2561 | // Check whether we can actually use the default argument. |
| 2562 | if (CheckTemplateArgument(Param, DefArg, |
| 2563 | FunctionTemplate, |
| 2564 | FunctionTemplate->getLocation(), |
| 2565 | FunctionTemplate->getSourceRange().getEnd(), |
Douglas Gregor | 6952f1e | 2011-01-19 20:10:05 +0000 | [diff] [blame] | 2566 | 0, Builder, |
Douglas Gregor | 8735b29 | 2011-06-03 02:59:40 +0000 | [diff] [blame] | 2567 | CTAK_Specified)) { |
Douglas Gregor | 51ffb0c | 2009-11-25 18:55:14 +0000 | [diff] [blame] | 2568 | Info.Param = makeTemplateParameter( |
| 2569 | const_cast<NamedDecl *>(TemplateParams->getParam(I))); |
Douglas Gregor | 910f800 | 2010-11-07 23:05:16 +0000 | [diff] [blame] | 2570 | // FIXME: These template arguments are temporary. Free them! |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2571 | Info.reset(TemplateArgumentList::CreateCopy(Context, Builder.data(), |
Douglas Gregor | 910f800 | 2010-11-07 23:05:16 +0000 | [diff] [blame] | 2572 | Builder.size())); |
Douglas Gregor | 51ffb0c | 2009-11-25 18:55:14 +0000 | [diff] [blame] | 2573 | return TDK_SubstitutionFailure; |
| 2574 | } |
| 2575 | |
| 2576 | // If we get here, we successfully used the default template argument. |
| 2577 | } |
| 2578 | |
| 2579 | // Form the template argument list from the deduced template arguments. |
| 2580 | TemplateArgumentList *DeducedArgumentList |
Douglas Gregor | 910f800 | 2010-11-07 23:05:16 +0000 | [diff] [blame] | 2581 | = TemplateArgumentList::CreateCopy(Context, Builder.data(), Builder.size()); |
Douglas Gregor | 51ffb0c | 2009-11-25 18:55:14 +0000 | [diff] [blame] | 2582 | Info.reset(DeducedArgumentList); |
| 2583 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2584 | // Substitute the deduced template arguments into the function template |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2585 | // declaration to produce the function template specialization. |
Douglas Gregor | d4598a2 | 2010-04-28 04:52:24 +0000 | [diff] [blame] | 2586 | DeclContext *Owner = FunctionTemplate->getDeclContext(); |
| 2587 | if (FunctionTemplate->getFriendObjectKind()) |
| 2588 | Owner = FunctionTemplate->getLexicalDeclContext(); |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2589 | Specialization = cast_or_null<FunctionDecl>( |
Douglas Gregor | d4598a2 | 2010-04-28 04:52:24 +0000 | [diff] [blame] | 2590 | SubstDecl(FunctionTemplate->getTemplatedDecl(), Owner, |
Douglas Gregor | 357bbd0 | 2009-08-28 20:50:45 +0000 | [diff] [blame] | 2591 | MultiLevelTemplateArgumentList(*DeducedArgumentList))); |
Douglas Gregor | 5fad9b8 | 2011-10-12 20:35:48 +0000 | [diff] [blame] | 2592 | if (!Specialization || Specialization->isInvalidDecl()) |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2593 | return TDK_SubstitutionFailure; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2594 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2595 | assert(Specialization->getPrimaryTemplate()->getCanonicalDecl() == |
Douglas Gregor | f882574 | 2009-09-15 18:26:13 +0000 | [diff] [blame] | 2596 | FunctionTemplate->getCanonicalDecl()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2597 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2598 | // If the template argument list is owned by the function template |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2599 | // specialization, release it. |
Douglas Gregor | ec20f46 | 2010-05-08 20:07:26 +0000 | [diff] [blame] | 2600 | if (Specialization->getTemplateSpecializationArgs() == DeducedArgumentList && |
| 2601 | !Trap.hasErrorOccurred()) |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2602 | Info.take(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2603 | |
Douglas Gregor | 5fad9b8 | 2011-10-12 20:35:48 +0000 | [diff] [blame] | 2604 | // There may have been an error that did not prevent us from constructing a |
| 2605 | // declaration. Mark the declaration invalid and return with a substitution |
| 2606 | // failure. |
| 2607 | if (Trap.hasErrorOccurred()) { |
| 2608 | Specialization->setInvalidDecl(true); |
| 2609 | return TDK_SubstitutionFailure; |
| 2610 | } |
| 2611 | |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2612 | if (OriginalCallArgs) { |
| 2613 | // C++ [temp.deduct.call]p4: |
| 2614 | // In general, the deduction process attempts to find template argument |
| 2615 | // values that will make the deduced A identical to A (after the type A |
| 2616 | // is transformed as described above). [...] |
| 2617 | for (unsigned I = 0, N = OriginalCallArgs->size(); I != N; ++I) { |
| 2618 | OriginalCallArg OriginalArg = (*OriginalCallArgs)[I]; |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2619 | unsigned ParamIdx = OriginalArg.ArgIdx; |
| 2620 | |
| 2621 | if (ParamIdx >= Specialization->getNumParams()) |
| 2622 | continue; |
| 2623 | |
| 2624 | QualType DeducedA = Specialization->getParamDecl(ParamIdx)->getType(); |
Douglas Gregor | b7edc4f | 2011-06-17 05:18:17 +0000 | [diff] [blame] | 2625 | if (CheckOriginalCallArgDeduction(*this, OriginalArg, DeducedA)) |
| 2626 | return Sema::TDK_SubstitutionFailure; |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2627 | } |
| 2628 | } |
| 2629 | |
Douglas Gregor | 9b62363 | 2010-10-12 23:32:35 +0000 | [diff] [blame] | 2630 | // If we suppressed any diagnostics while performing template argument |
| 2631 | // deduction, and if we haven't already instantiated this declaration, |
| 2632 | // keep track of these diagnostics. They'll be emitted if this specialization |
| 2633 | // is actually used. |
| 2634 | if (Info.diag_begin() != Info.diag_end()) { |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2635 | llvm::DenseMap<Decl *, SmallVector<PartialDiagnosticAt, 1> >::iterator |
Douglas Gregor | 9b62363 | 2010-10-12 23:32:35 +0000 | [diff] [blame] | 2636 | Pos = SuppressedDiagnostics.find(Specialization->getCanonicalDecl()); |
| 2637 | if (Pos == SuppressedDiagnostics.end()) |
| 2638 | SuppressedDiagnostics[Specialization->getCanonicalDecl()] |
| 2639 | .append(Info.diag_begin(), Info.diag_end()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2640 | } |
Douglas Gregor | 9b62363 | 2010-10-12 23:32:35 +0000 | [diff] [blame] | 2641 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2642 | return TDK_Success; |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2643 | } |
| 2644 | |
John McCall | 9c72c60 | 2010-08-27 09:08:28 +0000 | [diff] [blame] | 2645 | /// Gets the type of a function for template-argument-deducton |
| 2646 | /// purposes when it's considered as part of an overload set. |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2647 | static QualType GetTypeOfFunction(ASTContext &Context, |
John McCall | 9c72c60 | 2010-08-27 09:08:28 +0000 | [diff] [blame] | 2648 | const OverloadExpr::FindResult &R, |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2649 | FunctionDecl *Fn) { |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2650 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Fn)) |
John McCall | 9c72c60 | 2010-08-27 09:08:28 +0000 | [diff] [blame] | 2651 | if (Method->isInstance()) { |
| 2652 | // An instance method that's referenced in a form that doesn't |
| 2653 | // look like a member pointer is just invalid. |
| 2654 | if (!R.HasFormOfMemberPointer) return QualType(); |
| 2655 | |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2656 | return Context.getMemberPointerType(Fn->getType(), |
| 2657 | Context.getTypeDeclType(Method->getParent()).getTypePtr()); |
John McCall | 9c72c60 | 2010-08-27 09:08:28 +0000 | [diff] [blame] | 2658 | } |
| 2659 | |
| 2660 | if (!R.IsAddressOfOperand) return Fn->getType(); |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2661 | return Context.getPointerType(Fn->getType()); |
| 2662 | } |
| 2663 | |
| 2664 | /// Apply the deduction rules for overload sets. |
| 2665 | /// |
| 2666 | /// \return the null type if this argument should be treated as an |
| 2667 | /// undeduced context |
| 2668 | static QualType |
| 2669 | ResolveOverloadForDeduction(Sema &S, TemplateParameterList *TemplateParams, |
Douglas Gregor | 75f21af | 2010-08-30 21:04:23 +0000 | [diff] [blame] | 2670 | Expr *Arg, QualType ParamType, |
| 2671 | bool ParamWasReference) { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2672 | |
John McCall | 9c72c60 | 2010-08-27 09:08:28 +0000 | [diff] [blame] | 2673 | OverloadExpr::FindResult R = OverloadExpr::find(Arg); |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2674 | |
John McCall | 9c72c60 | 2010-08-27 09:08:28 +0000 | [diff] [blame] | 2675 | OverloadExpr *Ovl = R.Expression; |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2676 | |
Douglas Gregor | 75f21af | 2010-08-30 21:04:23 +0000 | [diff] [blame] | 2677 | // C++0x [temp.deduct.call]p4 |
| 2678 | unsigned TDF = 0; |
| 2679 | if (ParamWasReference) |
| 2680 | TDF |= TDF_ParamWithReferenceType; |
| 2681 | if (R.IsAddressOfOperand) |
| 2682 | TDF |= TDF_IgnoreQualifiers; |
| 2683 | |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2684 | // If there were explicit template arguments, we can only find |
| 2685 | // something via C++ [temp.arg.explicit]p3, i.e. if the arguments |
| 2686 | // unambiguously name a full specialization. |
John McCall | 7bb12da | 2010-02-02 06:20:04 +0000 | [diff] [blame] | 2687 | if (Ovl->hasExplicitTemplateArgs()) { |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2688 | // But we can still look for an explicit specialization. |
| 2689 | if (FunctionDecl *ExplicitSpec |
John McCall | 7bb12da | 2010-02-02 06:20:04 +0000 | [diff] [blame] | 2690 | = S.ResolveSingleFunctionTemplateSpecialization(Ovl)) |
John McCall | 9c72c60 | 2010-08-27 09:08:28 +0000 | [diff] [blame] | 2691 | return GetTypeOfFunction(S.Context, R, ExplicitSpec); |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2692 | return QualType(); |
| 2693 | } |
| 2694 | |
| 2695 | // C++0x [temp.deduct.call]p6: |
| 2696 | // When P is a function type, pointer to function type, or pointer |
| 2697 | // to member function type: |
| 2698 | |
| 2699 | if (!ParamType->isFunctionType() && |
| 2700 | !ParamType->isFunctionPointerType() && |
| 2701 | !ParamType->isMemberFunctionPointerType()) |
| 2702 | return QualType(); |
| 2703 | |
| 2704 | QualType Match; |
John McCall | 7bb12da | 2010-02-02 06:20:04 +0000 | [diff] [blame] | 2705 | for (UnresolvedSetIterator I = Ovl->decls_begin(), |
| 2706 | E = Ovl->decls_end(); I != E; ++I) { |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2707 | NamedDecl *D = (*I)->getUnderlyingDecl(); |
| 2708 | |
| 2709 | // - If the argument is an overload set containing one or more |
| 2710 | // function templates, the parameter is treated as a |
| 2711 | // non-deduced context. |
| 2712 | if (isa<FunctionTemplateDecl>(D)) |
| 2713 | return QualType(); |
| 2714 | |
| 2715 | FunctionDecl *Fn = cast<FunctionDecl>(D); |
John McCall | 9c72c60 | 2010-08-27 09:08:28 +0000 | [diff] [blame] | 2716 | QualType ArgType = GetTypeOfFunction(S.Context, R, Fn); |
| 2717 | if (ArgType.isNull()) continue; |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2718 | |
Douglas Gregor | 75f21af | 2010-08-30 21:04:23 +0000 | [diff] [blame] | 2719 | // Function-to-pointer conversion. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2720 | if (!ParamWasReference && ParamType->isPointerType() && |
Douglas Gregor | 75f21af | 2010-08-30 21:04:23 +0000 | [diff] [blame] | 2721 | ArgType->isFunctionType()) |
| 2722 | ArgType = S.Context.getPointerType(ArgType); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2723 | |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2724 | // - If the argument is an overload set (not containing function |
| 2725 | // templates), trial argument deduction is attempted using each |
| 2726 | // of the members of the set. If deduction succeeds for only one |
| 2727 | // of the overload set members, that member is used as the |
| 2728 | // argument value for the deduction. If deduction succeeds for |
| 2729 | // more than one member of the overload set the parameter is |
| 2730 | // treated as a non-deduced context. |
| 2731 | |
| 2732 | // We do all of this in a fresh context per C++0x [temp.deduct.type]p2: |
| 2733 | // Type deduction is done independently for each P/A pair, and |
| 2734 | // the deduced template argument values are then combined. |
| 2735 | // So we do not reject deductions which were made elsewhere. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2736 | SmallVector<DeducedTemplateArgument, 8> |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 2737 | Deduced(TemplateParams->size()); |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 2738 | TemplateDeductionInfo Info(S.Context, Ovl->getNameLoc()); |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2739 | Sema::TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 2740 | = DeduceTemplateArguments(S, TemplateParams, |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 2741 | ParamType, ArgType, |
| 2742 | Info, Deduced, TDF); |
| 2743 | if (Result) continue; |
| 2744 | if (!Match.isNull()) return QualType(); |
| 2745 | Match = ArgType; |
| 2746 | } |
| 2747 | |
| 2748 | return Match; |
| 2749 | } |
| 2750 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2751 | /// \brief Perform the adjustments to the parameter and argument types |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2752 | /// described in C++ [temp.deduct.call]. |
| 2753 | /// |
| 2754 | /// \returns true if the caller should not attempt to perform any template |
| 2755 | /// argument deduction based on this P/A pair. |
| 2756 | static bool AdjustFunctionParmAndArgTypesForDeduction(Sema &S, |
| 2757 | TemplateParameterList *TemplateParams, |
| 2758 | QualType &ParamType, |
| 2759 | QualType &ArgType, |
| 2760 | Expr *Arg, |
| 2761 | unsigned &TDF) { |
| 2762 | // C++0x [temp.deduct.call]p3: |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame] | 2763 | // If P is a cv-qualified type, the top level cv-qualifiers of P's type |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2764 | // are ignored for type deduction. |
Douglas Gregor | a459cc2 | 2011-04-27 23:34:22 +0000 | [diff] [blame] | 2765 | if (ParamType.hasQualifiers()) |
| 2766 | ParamType = ParamType.getUnqualifiedType(); |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2767 | const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>(); |
| 2768 | if (ParamRefType) { |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 2769 | QualType PointeeType = ParamRefType->getPointeeType(); |
| 2770 | |
Douglas Gregor | f15748a | 2011-06-03 03:35:07 +0000 | [diff] [blame] | 2771 | // If the argument has incomplete array type, try to complete it's type. |
| 2772 | if (ArgType->isIncompleteArrayType() && |
| 2773 | !S.RequireCompleteExprType(Arg, S.PDiag(), |
| 2774 | std::make_pair(SourceLocation(), S.PDiag()))) |
| 2775 | ArgType = Arg->getType(); |
| 2776 | |
Douglas Gregor | 2ad746a | 2011-01-21 05:18:22 +0000 | [diff] [blame] | 2777 | // [C++0x] If P is an rvalue reference to a cv-unqualified |
| 2778 | // template parameter and the argument is an lvalue, the type |
| 2779 | // "lvalue reference to A" is used in place of A for type |
| 2780 | // deduction. |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 2781 | if (isa<RValueReferenceType>(ParamType)) { |
| 2782 | if (!PointeeType.getQualifiers() && |
| 2783 | isa<TemplateTypeParmType>(PointeeType) && |
Douglas Gregor | 9625e44 | 2011-05-21 22:16:50 +0000 | [diff] [blame] | 2784 | Arg->Classify(S.Context).isLValue() && |
| 2785 | Arg->getType() != S.Context.OverloadTy && |
| 2786 | Arg->getType() != S.Context.BoundMemberTy) |
Douglas Gregor | 2ad746a | 2011-01-21 05:18:22 +0000 | [diff] [blame] | 2787 | ArgType = S.Context.getLValueReferenceType(ArgType); |
| 2788 | } |
| 2789 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2790 | // [...] If P is a reference type, the type referred to by P is used |
| 2791 | // for type deduction. |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 2792 | ParamType = PointeeType; |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2793 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2794 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2795 | // Overload sets usually make this parameter an undeduced |
| 2796 | // context, but there are sometimes special circumstances. |
| 2797 | if (ArgType == S.Context.OverloadTy) { |
| 2798 | ArgType = ResolveOverloadForDeduction(S, TemplateParams, |
| 2799 | Arg, ParamType, |
| 2800 | ParamRefType != 0); |
| 2801 | if (ArgType.isNull()) |
| 2802 | return true; |
| 2803 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2804 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2805 | if (ParamRefType) { |
| 2806 | // C++0x [temp.deduct.call]p3: |
| 2807 | // [...] If P is of the form T&&, where T is a template parameter, and |
| 2808 | // the argument is an lvalue, the type A& is used in place of A for |
| 2809 | // type deduction. |
| 2810 | if (ParamRefType->isRValueReferenceType() && |
| 2811 | ParamRefType->getAs<TemplateTypeParmType>() && |
| 2812 | Arg->isLValue()) |
| 2813 | ArgType = S.Context.getLValueReferenceType(ArgType); |
| 2814 | } else { |
| 2815 | // C++ [temp.deduct.call]p2: |
| 2816 | // If P is not a reference type: |
| 2817 | // - If A is an array type, the pointer type produced by the |
| 2818 | // array-to-pointer standard conversion (4.2) is used in place of |
| 2819 | // A for type deduction; otherwise, |
| 2820 | if (ArgType->isArrayType()) |
| 2821 | ArgType = S.Context.getArrayDecayedType(ArgType); |
| 2822 | // - If A is a function type, the pointer type produced by the |
| 2823 | // function-to-pointer standard conversion (4.3) is used in place |
| 2824 | // of A for type deduction; otherwise, |
| 2825 | else if (ArgType->isFunctionType()) |
| 2826 | ArgType = S.Context.getPointerType(ArgType); |
| 2827 | else { |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame] | 2828 | // - If A is a cv-qualified type, the top level cv-qualifiers of A's |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2829 | // type are ignored for type deduction. |
Douglas Gregor | a459cc2 | 2011-04-27 23:34:22 +0000 | [diff] [blame] | 2830 | ArgType = ArgType.getUnqualifiedType(); |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2831 | } |
| 2832 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2833 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2834 | // C++0x [temp.deduct.call]p4: |
| 2835 | // In general, the deduction process attempts to find template argument |
| 2836 | // values that will make the deduced A identical to A (after the type A |
| 2837 | // is transformed as described above). [...] |
| 2838 | TDF = TDF_SkipNonDependent; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2839 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2840 | // - If the original P is a reference type, the deduced A (i.e., the |
| 2841 | // type referred to by the reference) can be more cv-qualified than |
| 2842 | // the transformed A. |
| 2843 | if (ParamRefType) |
| 2844 | TDF |= TDF_ParamWithReferenceType; |
| 2845 | // - The transformed A can be another pointer or pointer to member |
| 2846 | // type that can be converted to the deduced A via a qualification |
| 2847 | // conversion (4.4). |
| 2848 | if (ArgType->isPointerType() || ArgType->isMemberPointerType() || |
| 2849 | ArgType->isObjCObjectPointerType()) |
| 2850 | TDF |= TDF_IgnoreQualifiers; |
| 2851 | // - If P is a class and P has the form simple-template-id, then the |
| 2852 | // transformed A can be a derived class of the deduced A. Likewise, |
| 2853 | // if P is a pointer to a class of the form simple-template-id, the |
| 2854 | // transformed A can be a pointer to a derived class pointed to by |
| 2855 | // the deduced A. |
| 2856 | if (isSimpleTemplateIdType(ParamType) || |
| 2857 | (isa<PointerType>(ParamType) && |
| 2858 | isSimpleTemplateIdType( |
| 2859 | ParamType->getAs<PointerType>()->getPointeeType()))) |
| 2860 | TDF |= TDF_DerivedClass; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2861 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2862 | return false; |
| 2863 | } |
| 2864 | |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2865 | static bool hasDeducibleTemplateParameters(Sema &S, |
| 2866 | FunctionTemplateDecl *FunctionTemplate, |
| 2867 | QualType T); |
| 2868 | |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2869 | /// \brief Perform template argument deduction from a function call |
| 2870 | /// (C++ [temp.deduct.call]). |
| 2871 | /// |
| 2872 | /// \param FunctionTemplate the function template for which we are performing |
| 2873 | /// template argument deduction. |
| 2874 | /// |
Douglas Gregor | 48026d2 | 2010-01-11 18:40:55 +0000 | [diff] [blame] | 2875 | /// \param ExplicitTemplateArguments the explicit template arguments provided |
| 2876 | /// for this call. |
Douglas Gregor | 6db8ed4 | 2009-06-30 23:57:56 +0000 | [diff] [blame] | 2877 | /// |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2878 | /// \param Args the function call arguments |
| 2879 | /// |
| 2880 | /// \param NumArgs the number of arguments in Args |
| 2881 | /// |
Douglas Gregor | 48026d2 | 2010-01-11 18:40:55 +0000 | [diff] [blame] | 2882 | /// \param Name the name of the function being called. This is only significant |
| 2883 | /// when the function template is a conversion function template, in which |
| 2884 | /// case this routine will also perform template argument deduction based on |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2885 | /// the function to which |
Douglas Gregor | 48026d2 | 2010-01-11 18:40:55 +0000 | [diff] [blame] | 2886 | /// |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2887 | /// \param Specialization if template argument deduction was successful, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2888 | /// this will be set to the function template specialization produced by |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2889 | /// template argument deduction. |
| 2890 | /// |
| 2891 | /// \param Info the argument will be updated to provide additional information |
| 2892 | /// about template argument deduction. |
| 2893 | /// |
| 2894 | /// \returns the result of template argument deduction. |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2895 | Sema::TemplateDeductionResult |
| 2896 | Sema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, |
Douglas Gregor | 6771423 | 2011-03-03 02:41:12 +0000 | [diff] [blame] | 2897 | TemplateArgumentListInfo *ExplicitTemplateArgs, |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2898 | Expr **Args, unsigned NumArgs, |
| 2899 | FunctionDecl *&Specialization, |
| 2900 | TemplateDeductionInfo &Info) { |
| 2901 | FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); |
Douglas Gregor | 6db8ed4 | 2009-06-30 23:57:56 +0000 | [diff] [blame] | 2902 | |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2903 | // C++ [temp.deduct.call]p1: |
| 2904 | // Template argument deduction is done by comparing each function template |
| 2905 | // parameter type (call it P) with the type of the corresponding argument |
| 2906 | // of the call (call it A) as described below. |
| 2907 | unsigned CheckArgs = NumArgs; |
Douglas Gregor | 6db8ed4 | 2009-06-30 23:57:56 +0000 | [diff] [blame] | 2908 | if (NumArgs < Function->getMinRequiredArguments()) |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2909 | return TDK_TooFewArguments; |
| 2910 | else if (NumArgs > Function->getNumParams()) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2911 | const FunctionProtoType *Proto |
John McCall | 183700f | 2009-09-21 23:43:11 +0000 | [diff] [blame] | 2912 | = Function->getType()->getAs<FunctionProtoType>(); |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2913 | if (Proto->isTemplateVariadic()) |
| 2914 | /* Do nothing */; |
| 2915 | else if (Proto->isVariadic()) |
| 2916 | CheckArgs = Function->getNumParams(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2917 | else |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2918 | return TDK_TooManyArguments; |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2919 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2920 | |
Douglas Gregor | 6db8ed4 | 2009-06-30 23:57:56 +0000 | [diff] [blame] | 2921 | // The types of the parameters from which we will perform template argument |
| 2922 | // deduction. |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 2923 | LocalInstantiationScope InstScope(*this); |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 2924 | TemplateParameterList *TemplateParams |
| 2925 | = FunctionTemplate->getTemplateParameters(); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2926 | SmallVector<DeducedTemplateArgument, 4> Deduced; |
| 2927 | SmallVector<QualType, 4> ParamTypes; |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 2928 | unsigned NumExplicitlySpecified = 0; |
John McCall | d5532b6 | 2009-11-23 01:53:49 +0000 | [diff] [blame] | 2929 | if (ExplicitTemplateArgs) { |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2930 | TemplateDeductionResult Result = |
| 2931 | SubstituteExplicitTemplateArguments(FunctionTemplate, |
John McCall | d5532b6 | 2009-11-23 01:53:49 +0000 | [diff] [blame] | 2932 | *ExplicitTemplateArgs, |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 2933 | Deduced, |
| 2934 | ParamTypes, |
| 2935 | 0, |
| 2936 | Info); |
| 2937 | if (Result) |
| 2938 | return Result; |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 2939 | |
| 2940 | NumExplicitlySpecified = Deduced.size(); |
Douglas Gregor | 6db8ed4 | 2009-06-30 23:57:56 +0000 | [diff] [blame] | 2941 | } else { |
| 2942 | // Just fill in the parameter types from the function declaration. |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2943 | for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) |
Douglas Gregor | 6db8ed4 | 2009-06-30 23:57:56 +0000 | [diff] [blame] | 2944 | ParamTypes.push_back(Function->getParamDecl(I)->getType()); |
| 2945 | } |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2946 | |
Douglas Gregor | 6db8ed4 | 2009-06-30 23:57:56 +0000 | [diff] [blame] | 2947 | // Deduce template arguments from the function parameters. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2948 | Deduced.resize(TemplateParams->size()); |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2949 | unsigned ArgIdx = 0; |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 2950 | SmallVector<OriginalCallArg, 4> OriginalCallArgs; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2951 | for (unsigned ParamIdx = 0, NumParams = ParamTypes.size(); |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2952 | ParamIdx != NumParams; ++ParamIdx) { |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2953 | QualType OrigParamType = ParamTypes[ParamIdx]; |
| 2954 | QualType ParamType = OrigParamType; |
| 2955 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2956 | const PackExpansionType *ParamExpansion |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2957 | = dyn_cast<PackExpansionType>(ParamType); |
| 2958 | if (!ParamExpansion) { |
| 2959 | // Simple case: matching a function parameter to a function argument. |
| 2960 | if (ArgIdx >= CheckArgs) |
| 2961 | break; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2962 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2963 | Expr *Arg = Args[ArgIdx++]; |
| 2964 | QualType ArgType = Arg->getType(); |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2965 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2966 | unsigned TDF = 0; |
| 2967 | if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, |
| 2968 | ParamType, ArgType, Arg, |
| 2969 | TDF)) |
| 2970 | continue; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2971 | |
Douglas Gregor | d8f5b33 | 2011-10-09 22:06:46 +0000 | [diff] [blame] | 2972 | // If we have nothing to deduce, we're done. |
| 2973 | if (!hasDeducibleTemplateParameters(*this, FunctionTemplate, ParamType)) |
| 2974 | continue; |
| 2975 | |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2976 | // Keep track of the argument type and corresponding parameter index, |
| 2977 | // so we can check for compatibility between the deduced A and A. |
Douglas Gregor | d8f5b33 | 2011-10-09 22:06:46 +0000 | [diff] [blame] | 2978 | OriginalCallArgs.push_back(OriginalCallArg(OrigParamType, ArgIdx-1, |
| 2979 | ArgType)); |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 2980 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2981 | if (TemplateDeductionResult Result |
Douglas Gregor | d8f5b33 | 2011-10-09 22:06:46 +0000 | [diff] [blame] | 2982 | = ::DeduceTemplateArguments(*this, TemplateParams, |
| 2983 | ParamType, ArgType, Info, Deduced, |
| 2984 | TDF)) |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2985 | return Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 2986 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2987 | continue; |
Douglas Gregor | 75f21af | 2010-08-30 21:04:23 +0000 | [diff] [blame] | 2988 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2989 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 2990 | // C++0x [temp.deduct.call]p1: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2991 | // For a function parameter pack that occurs at the end of the |
| 2992 | // parameter-declaration-list, the type A of each remaining argument of |
| 2993 | // the call is compared with the type P of the declarator-id of the |
| 2994 | // function parameter pack. Each comparison deduces template arguments |
| 2995 | // for subsequent positions in the template parameter packs expanded by |
Douglas Gregor | 7d5c0c1 | 2011-01-11 01:52:23 +0000 | [diff] [blame] | 2996 | // the function parameter pack. For a function parameter pack that does |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 2997 | // not occur at the end of the parameter-declaration-list, the type of |
Douglas Gregor | 7d5c0c1 | 2011-01-11 01:52:23 +0000 | [diff] [blame] | 2998 | // the parameter pack is a non-deduced context. |
| 2999 | if (ParamIdx + 1 < NumParams) |
| 3000 | break; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3001 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3002 | QualType ParamPattern = ParamExpansion->getPattern(); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3003 | SmallVector<unsigned, 2> PackIndices; |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3004 | { |
| 3005 | llvm::BitVector SawIndices(TemplateParams->size()); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3006 | SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3007 | collectUnexpandedParameterPacks(ParamPattern, Unexpanded); |
| 3008 | for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { |
| 3009 | unsigned Depth, Index; |
| 3010 | llvm::tie(Depth, Index) = getDepthAndIndex(Unexpanded[I]); |
| 3011 | if (Depth == 0 && !SawIndices[Index]) { |
| 3012 | SawIndices[Index] = true; |
| 3013 | PackIndices.push_back(Index); |
| 3014 | } |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 3015 | } |
| 3016 | } |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3017 | assert(!PackIndices.empty() && "Pack expansion without unexpanded packs?"); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3018 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3019 | // Keep track of the deduced template arguments for each parameter pack |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3020 | // expanded by this pack expansion (the outer index) and for each |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3021 | // template argument (the inner SmallVectors). |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3022 | SmallVector<SmallVector<DeducedTemplateArgument, 4>, 2> |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 3023 | NewlyDeducedPacks(PackIndices.size()); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3024 | SmallVector<DeducedTemplateArgument, 2> |
Douglas Gregor | d373119 | 2011-01-10 07:32:04 +0000 | [diff] [blame] | 3025 | SavedPacks(PackIndices.size()); |
Douglas Gregor | 5429385 | 2011-01-10 17:35:05 +0000 | [diff] [blame] | 3026 | PrepareArgumentPackDeduction(*this, Deduced, PackIndices, SavedPacks, |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3027 | NewlyDeducedPacks); |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3028 | bool HasAnyArguments = false; |
| 3029 | for (; ArgIdx < NumArgs; ++ArgIdx) { |
| 3030 | HasAnyArguments = true; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3031 | |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 3032 | QualType OrigParamType = ParamPattern; |
| 3033 | ParamType = OrigParamType; |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3034 | Expr *Arg = Args[ArgIdx]; |
| 3035 | QualType ArgType = Arg->getType(); |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 3036 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3037 | unsigned TDF = 0; |
| 3038 | if (AdjustFunctionParmAndArgTypesForDeduction(*this, TemplateParams, |
| 3039 | ParamType, ArgType, Arg, |
| 3040 | TDF)) { |
| 3041 | // We can't actually perform any deduction for this argument, so stop |
| 3042 | // deduction at this point. |
| 3043 | ++ArgIdx; |
| 3044 | break; |
| 3045 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3046 | |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 3047 | // Keep track of the argument type and corresponding argument index, |
| 3048 | // so we can check for compatibility between the deduced A and A. |
| 3049 | if (hasDeducibleTemplateParameters(*this, FunctionTemplate, ParamType)) |
| 3050 | OriginalCallArgs.push_back(OriginalCallArg(OrigParamType, ArgIdx, |
| 3051 | ArgType)); |
| 3052 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3053 | if (TemplateDeductionResult Result |
| 3054 | = ::DeduceTemplateArguments(*this, TemplateParams, |
| 3055 | ParamType, ArgType, Info, Deduced, |
| 3056 | TDF)) |
| 3057 | return Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3058 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3059 | // Capture the deduced template arguments for each parameter pack expanded |
| 3060 | // by this pack expansion, add them to the list of arguments we've deduced |
| 3061 | // for that pack, then clear out the deduced argument. |
| 3062 | for (unsigned I = 0, N = PackIndices.size(); I != N; ++I) { |
| 3063 | DeducedTemplateArgument &DeducedArg = Deduced[PackIndices[I]]; |
| 3064 | if (!DeducedArg.isNull()) { |
| 3065 | NewlyDeducedPacks[I].push_back(DeducedArg); |
| 3066 | DeducedArg = DeducedTemplateArgument(); |
| 3067 | } |
| 3068 | } |
| 3069 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3070 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3071 | // Build argument packs for each of the parameter packs expanded by this |
| 3072 | // pack expansion. |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 3073 | if (Sema::TemplateDeductionResult Result |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3074 | = FinishArgumentPackDeduction(*this, TemplateParams, HasAnyArguments, |
Douglas Gregor | 0216f81 | 2011-01-10 17:53:52 +0000 | [diff] [blame] | 3075 | Deduced, PackIndices, SavedPacks, |
| 3076 | NewlyDeducedPacks, Info)) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3077 | return Result; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3078 | |
Douglas Gregor | f5c65ff | 2011-01-06 22:09:01 +0000 | [diff] [blame] | 3079 | // After we've matching against a parameter pack, we're done. |
| 3080 | break; |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 3081 | } |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3082 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3083 | return FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 3084 | NumExplicitlySpecified, |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 3085 | Specialization, Info, &OriginalCallArgs); |
Douglas Gregor | e53060f | 2009-06-25 22:08:12 +0000 | [diff] [blame] | 3086 | } |
| 3087 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3088 | /// \brief Deduce template arguments when taking the address of a function |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3089 | /// template (C++ [temp.deduct.funcaddr]) or matching a specialization to |
| 3090 | /// a template. |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3091 | /// |
| 3092 | /// \param FunctionTemplate the function template for which we are performing |
| 3093 | /// template argument deduction. |
| 3094 | /// |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3095 | /// \param ExplicitTemplateArguments the explicitly-specified template |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3096 | /// arguments. |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3097 | /// |
| 3098 | /// \param ArgFunctionType the function type that will be used as the |
| 3099 | /// "argument" type (A) when performing template argument deduction from the |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3100 | /// function template's function type. This type may be NULL, if there is no |
| 3101 | /// argument type to compare against, in C++0x [temp.arg.explicit]p3. |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3102 | /// |
| 3103 | /// \param Specialization if template argument deduction was successful, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3104 | /// this will be set to the function template specialization produced by |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3105 | /// template argument deduction. |
| 3106 | /// |
| 3107 | /// \param Info the argument will be updated to provide additional information |
| 3108 | /// about template argument deduction. |
| 3109 | /// |
| 3110 | /// \returns the result of template argument deduction. |
| 3111 | Sema::TemplateDeductionResult |
| 3112 | Sema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, |
Douglas Gregor | 6771423 | 2011-03-03 02:41:12 +0000 | [diff] [blame] | 3113 | TemplateArgumentListInfo *ExplicitTemplateArgs, |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3114 | QualType ArgFunctionType, |
| 3115 | FunctionDecl *&Specialization, |
| 3116 | TemplateDeductionInfo &Info) { |
| 3117 | FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); |
| 3118 | TemplateParameterList *TemplateParams |
| 3119 | = FunctionTemplate->getTemplateParameters(); |
| 3120 | QualType FunctionType = Function->getType(); |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3121 | |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3122 | // Substitute any explicit template arguments. |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 3123 | LocalInstantiationScope InstScope(*this); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3124 | SmallVector<DeducedTemplateArgument, 4> Deduced; |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 3125 | unsigned NumExplicitlySpecified = 0; |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3126 | SmallVector<QualType, 4> ParamTypes; |
John McCall | d5532b6 | 2009-11-23 01:53:49 +0000 | [diff] [blame] | 3127 | if (ExplicitTemplateArgs) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3128 | if (TemplateDeductionResult Result |
| 3129 | = SubstituteExplicitTemplateArguments(FunctionTemplate, |
John McCall | d5532b6 | 2009-11-23 01:53:49 +0000 | [diff] [blame] | 3130 | *ExplicitTemplateArgs, |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3131 | Deduced, ParamTypes, |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3132 | &FunctionType, Info)) |
| 3133 | return Result; |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 3134 | |
| 3135 | NumExplicitlySpecified = Deduced.size(); |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3136 | } |
| 3137 | |
| 3138 | // Template argument deduction for function templates in a SFINAE context. |
| 3139 | // Trap any errors that might occur. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3140 | SFINAETrap Trap(*this); |
| 3141 | |
John McCall | eff9213 | 2010-02-02 02:21:27 +0000 | [diff] [blame] | 3142 | Deduced.resize(TemplateParams->size()); |
| 3143 | |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3144 | if (!ArgFunctionType.isNull()) { |
| 3145 | // Deduce template arguments from the function type. |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3146 | if (TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 3147 | = ::DeduceTemplateArguments(*this, TemplateParams, |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3148 | FunctionType, ArgFunctionType, Info, |
Douglas Gregor | 73b3cf6 | 2011-01-25 17:19:08 +0000 | [diff] [blame] | 3149 | Deduced, TDF_TopLevelParameterTypeList)) |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3150 | return Result; |
| 3151 | } |
Douglas Gregor | fbb6fad | 2010-09-29 21:14:36 +0000 | [diff] [blame] | 3152 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3153 | if (TemplateDeductionResult Result |
Douglas Gregor | fbb6fad | 2010-09-29 21:14:36 +0000 | [diff] [blame] | 3154 | = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, |
| 3155 | NumExplicitlySpecified, |
| 3156 | Specialization, Info)) |
| 3157 | return Result; |
| 3158 | |
| 3159 | // If the requested function type does not match the actual type of the |
| 3160 | // specialization, template argument deduction fails. |
| 3161 | if (!ArgFunctionType.isNull() && |
| 3162 | !Context.hasSameType(ArgFunctionType, Specialization->getType())) |
| 3163 | return TDK_NonDeducedMismatch; |
| 3164 | |
| 3165 | return TDK_Success; |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3166 | } |
| 3167 | |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3168 | /// \brief Deduce template arguments for a templated conversion |
| 3169 | /// function (C++ [temp.deduct.conv]) and, if successful, produce a |
| 3170 | /// conversion function template specialization. |
| 3171 | Sema::TemplateDeductionResult |
| 3172 | Sema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, |
| 3173 | QualType ToType, |
| 3174 | CXXConversionDecl *&Specialization, |
| 3175 | TemplateDeductionInfo &Info) { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3176 | CXXConversionDecl *Conv |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3177 | = cast<CXXConversionDecl>(FunctionTemplate->getTemplatedDecl()); |
| 3178 | QualType FromType = Conv->getConversionType(); |
| 3179 | |
| 3180 | // Canonicalize the types for deduction. |
| 3181 | QualType P = Context.getCanonicalType(FromType); |
| 3182 | QualType A = Context.getCanonicalType(ToType); |
| 3183 | |
Douglas Gregor | 5453d93 | 2011-03-06 09:03:20 +0000 | [diff] [blame] | 3184 | // C++0x [temp.deduct.conv]p2: |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3185 | // If P is a reference type, the type referred to by P is used for |
| 3186 | // type deduction. |
| 3187 | if (const ReferenceType *PRef = P->getAs<ReferenceType>()) |
| 3188 | P = PRef->getPointeeType(); |
| 3189 | |
Douglas Gregor | 5453d93 | 2011-03-06 09:03:20 +0000 | [diff] [blame] | 3190 | // C++0x [temp.deduct.conv]p4: |
| 3191 | // [...] If A is a reference type, the type referred to by A is used |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3192 | // for type deduction. |
| 3193 | if (const ReferenceType *ARef = A->getAs<ReferenceType>()) |
Douglas Gregor | 5453d93 | 2011-03-06 09:03:20 +0000 | [diff] [blame] | 3194 | A = ARef->getPointeeType().getUnqualifiedType(); |
| 3195 | // C++ [temp.deduct.conv]p3: |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3196 | // |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3197 | // If A is not a reference type: |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3198 | else { |
| 3199 | assert(!A->isReferenceType() && "Reference types were handled above"); |
| 3200 | |
| 3201 | // - If P is an array type, the pointer type produced by the |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3202 | // array-to-pointer standard conversion (4.2) is used in place |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3203 | // of P for type deduction; otherwise, |
| 3204 | if (P->isArrayType()) |
| 3205 | P = Context.getArrayDecayedType(P); |
| 3206 | // - If P is a function type, the pointer type produced by the |
| 3207 | // function-to-pointer standard conversion (4.3) is used in |
| 3208 | // place of P for type deduction; otherwise, |
| 3209 | else if (P->isFunctionType()) |
| 3210 | P = Context.getPointerType(P); |
| 3211 | // - If P is a cv-qualified type, the top level cv-qualifiers of |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame] | 3212 | // P's type are ignored for type deduction. |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3213 | else |
| 3214 | P = P.getUnqualifiedType(); |
| 3215 | |
Douglas Gregor | 5453d93 | 2011-03-06 09:03:20 +0000 | [diff] [blame] | 3216 | // C++0x [temp.deduct.conv]p4: |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame] | 3217 | // If A is a cv-qualified type, the top level cv-qualifiers of A's |
Douglas Gregor | 5453d93 | 2011-03-06 09:03:20 +0000 | [diff] [blame] | 3218 | // type are ignored for type deduction. If A is a reference type, the type |
| 3219 | // referred to by A is used for type deduction. |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3220 | A = A.getUnqualifiedType(); |
| 3221 | } |
| 3222 | |
| 3223 | // Template argument deduction for function templates in a SFINAE context. |
| 3224 | // Trap any errors that might occur. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3225 | SFINAETrap Trap(*this); |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3226 | |
| 3227 | // C++ [temp.deduct.conv]p1: |
| 3228 | // Template argument deduction is done by comparing the return |
| 3229 | // type of the template conversion function (call it P) with the |
| 3230 | // type that is required as the result of the conversion (call it |
| 3231 | // A) as described in 14.8.2.4. |
| 3232 | TemplateParameterList *TemplateParams |
| 3233 | = FunctionTemplate->getTemplateParameters(); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3234 | SmallVector<DeducedTemplateArgument, 4> Deduced; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3235 | Deduced.resize(TemplateParams->size()); |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3236 | |
| 3237 | // C++0x [temp.deduct.conv]p4: |
| 3238 | // In general, the deduction process attempts to find template |
| 3239 | // argument values that will make the deduced A identical to |
| 3240 | // A. However, there are two cases that allow a difference: |
| 3241 | unsigned TDF = 0; |
| 3242 | // - If the original A is a reference type, A can be more |
| 3243 | // cv-qualified than the deduced A (i.e., the type referred to |
| 3244 | // by the reference) |
| 3245 | if (ToType->isReferenceType()) |
| 3246 | TDF |= TDF_ParamWithReferenceType; |
| 3247 | // - The deduced A can be another pointer or pointer to member |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame] | 3248 | // type that can be converted to A via a qualification |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3249 | // conversion. |
| 3250 | // |
| 3251 | // (C++0x [temp.deduct.conv]p6 clarifies that this only happens when |
| 3252 | // both P and A are pointers or member pointers. In this case, we |
| 3253 | // just ignore cv-qualifiers completely). |
| 3254 | if ((P->isPointerType() && A->isPointerType()) || |
Douglas Gregor | 2cae1e2 | 2011-08-30 00:37:54 +0000 | [diff] [blame] | 3255 | (P->isMemberPointerType() && A->isMemberPointerType())) |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3256 | TDF |= TDF_IgnoreQualifiers; |
| 3257 | if (TemplateDeductionResult Result |
Chandler Carruth | a7ef130 | 2010-02-07 21:33:28 +0000 | [diff] [blame] | 3258 | = ::DeduceTemplateArguments(*this, TemplateParams, |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3259 | P, A, Info, Deduced, TDF)) |
| 3260 | return Result; |
| 3261 | |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3262 | // Finish template argument deduction. |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 3263 | LocalInstantiationScope InstScope(*this); |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3264 | FunctionDecl *Spec = 0; |
| 3265 | TemplateDeductionResult Result |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3266 | = FinishTemplateArgumentDeduction(FunctionTemplate, Deduced, 0, Spec, |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 3267 | Info); |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3268 | Specialization = cast_or_null<CXXConversionDecl>(Spec); |
| 3269 | return Result; |
| 3270 | } |
| 3271 | |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3272 | /// \brief Deduce template arguments for a function template when there is |
| 3273 | /// nothing to deduce against (C++0x [temp.arg.explicit]p3). |
| 3274 | /// |
| 3275 | /// \param FunctionTemplate the function template for which we are performing |
| 3276 | /// template argument deduction. |
| 3277 | /// |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3278 | /// \param ExplicitTemplateArguments the explicitly-specified template |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3279 | /// arguments. |
| 3280 | /// |
| 3281 | /// \param Specialization if template argument deduction was successful, |
| 3282 | /// this will be set to the function template specialization produced by |
| 3283 | /// template argument deduction. |
| 3284 | /// |
| 3285 | /// \param Info the argument will be updated to provide additional information |
| 3286 | /// about template argument deduction. |
| 3287 | /// |
| 3288 | /// \returns the result of template argument deduction. |
| 3289 | Sema::TemplateDeductionResult |
| 3290 | Sema::DeduceTemplateArguments(FunctionTemplateDecl *FunctionTemplate, |
Douglas Gregor | 6771423 | 2011-03-03 02:41:12 +0000 | [diff] [blame] | 3291 | TemplateArgumentListInfo *ExplicitTemplateArgs, |
Douglas Gregor | 4b52e25 | 2009-12-21 23:17:24 +0000 | [diff] [blame] | 3292 | FunctionDecl *&Specialization, |
| 3293 | TemplateDeductionInfo &Info) { |
| 3294 | return DeduceTemplateArguments(FunctionTemplate, ExplicitTemplateArgs, |
| 3295 | QualType(), Specialization, Info); |
| 3296 | } |
| 3297 | |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3298 | namespace { |
| 3299 | /// Substitute the 'auto' type specifier within a type for a given replacement |
| 3300 | /// type. |
| 3301 | class SubstituteAutoTransform : |
| 3302 | public TreeTransform<SubstituteAutoTransform> { |
| 3303 | QualType Replacement; |
| 3304 | public: |
| 3305 | SubstituteAutoTransform(Sema &SemaRef, QualType Replacement) : |
| 3306 | TreeTransform<SubstituteAutoTransform>(SemaRef), Replacement(Replacement) { |
| 3307 | } |
| 3308 | QualType TransformAutoType(TypeLocBuilder &TLB, AutoTypeLoc TL) { |
| 3309 | // If we're building the type pattern to deduce against, don't wrap the |
| 3310 | // substituted type in an AutoType. Certain template deduction rules |
| 3311 | // apply only when a template type parameter appears directly (and not if |
| 3312 | // the parameter is found through desugaring). For instance: |
| 3313 | // auto &&lref = lvalue; |
| 3314 | // must transform into "rvalue reference to T" not "rvalue reference to |
| 3315 | // auto type deduced as T" in order for [temp.deduct.call]p3 to apply. |
| 3316 | if (isa<TemplateTypeParmType>(Replacement)) { |
| 3317 | QualType Result = Replacement; |
| 3318 | TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result); |
| 3319 | NewTL.setNameLoc(TL.getNameLoc()); |
| 3320 | return Result; |
| 3321 | } else { |
| 3322 | QualType Result = RebuildAutoType(Replacement); |
| 3323 | AutoTypeLoc NewTL = TLB.push<AutoTypeLoc>(Result); |
| 3324 | NewTL.setNameLoc(TL.getNameLoc()); |
| 3325 | return Result; |
| 3326 | } |
| 3327 | } |
| 3328 | }; |
| 3329 | } |
| 3330 | |
| 3331 | /// \brief Deduce the type for an auto type-specifier (C++0x [dcl.spec.auto]p6) |
| 3332 | /// |
| 3333 | /// \param Type the type pattern using the auto type-specifier. |
| 3334 | /// |
| 3335 | /// \param Init the initializer for the variable whose type is to be deduced. |
| 3336 | /// |
| 3337 | /// \param Result if type deduction was successful, this will be set to the |
| 3338 | /// deduced type. This may still contain undeduced autos if the type is |
Richard Smith | a085da8 | 2011-03-17 16:11:59 +0000 | [diff] [blame] | 3339 | /// dependent. This will be set to null if deduction succeeded, but auto |
| 3340 | /// substitution failed; the appropriate diagnostic will already have been |
| 3341 | /// produced in that case. |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3342 | /// |
| 3343 | /// \returns true if deduction succeeded, false if it failed. |
| 3344 | bool |
John McCall | 32509f1 | 2011-11-15 01:35:18 +0000 | [diff] [blame] | 3345 | Sema::DeduceAutoType(TypeSourceInfo *Type, Expr *&Init, |
Richard Smith | a085da8 | 2011-03-17 16:11:59 +0000 | [diff] [blame] | 3346 | TypeSourceInfo *&Result) { |
John McCall | 32509f1 | 2011-11-15 01:35:18 +0000 | [diff] [blame] | 3347 | if (Init->getType()->isNonOverloadPlaceholderType()) { |
| 3348 | ExprResult result = CheckPlaceholderExpr(Init); |
| 3349 | if (result.isInvalid()) return false; |
| 3350 | Init = result.take(); |
| 3351 | } |
| 3352 | |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3353 | if (Init->isTypeDependent()) { |
| 3354 | Result = Type; |
| 3355 | return true; |
| 3356 | } |
| 3357 | |
| 3358 | SourceLocation Loc = Init->getExprLoc(); |
| 3359 | |
| 3360 | LocalInstantiationScope InstScope(*this); |
| 3361 | |
| 3362 | // Build template<class TemplParam> void Func(FuncParam); |
Chandler Carruth | 4fb86f8 | 2011-05-01 00:51:33 +0000 | [diff] [blame] | 3363 | TemplateTypeParmDecl *TemplParam = |
| 3364 | TemplateTypeParmDecl::Create(Context, 0, SourceLocation(), Loc, 0, 0, 0, |
| 3365 | false, false); |
| 3366 | QualType TemplArg = QualType(TemplParam->getTypeForDecl(), 0); |
| 3367 | NamedDecl *TemplParamPtr = TemplParam; |
Richard Smith | 483b9f3 | 2011-02-21 20:05:19 +0000 | [diff] [blame] | 3368 | FixedSizeTemplateParameterList<1> TemplateParams(Loc, Loc, &TemplParamPtr, |
| 3369 | Loc); |
| 3370 | |
Richard Smith | a085da8 | 2011-03-17 16:11:59 +0000 | [diff] [blame] | 3371 | TypeSourceInfo *FuncParamInfo = |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3372 | SubstituteAutoTransform(*this, TemplArg).TransformType(Type); |
Richard Smith | a085da8 | 2011-03-17 16:11:59 +0000 | [diff] [blame] | 3373 | assert(FuncParamInfo && "substituting template parameter for 'auto' failed"); |
| 3374 | QualType FuncParam = FuncParamInfo->getType(); |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3375 | |
| 3376 | // Deduce type of TemplParam in Func(Init) |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3377 | SmallVector<DeducedTemplateArgument, 1> Deduced; |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3378 | Deduced.resize(1); |
| 3379 | QualType InitType = Init->getType(); |
| 3380 | unsigned TDF = 0; |
Richard Smith | 483b9f3 | 2011-02-21 20:05:19 +0000 | [diff] [blame] | 3381 | if (AdjustFunctionParmAndArgTypesForDeduction(*this, &TemplateParams, |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3382 | FuncParam, InitType, Init, |
| 3383 | TDF)) |
| 3384 | return false; |
| 3385 | |
| 3386 | TemplateDeductionInfo Info(Context, Loc); |
Richard Smith | 483b9f3 | 2011-02-21 20:05:19 +0000 | [diff] [blame] | 3387 | if (::DeduceTemplateArguments(*this, &TemplateParams, |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3388 | FuncParam, InitType, Info, Deduced, |
| 3389 | TDF)) |
| 3390 | return false; |
| 3391 | |
| 3392 | QualType DeducedType = Deduced[0].getAsType(); |
| 3393 | if (DeducedType.isNull()) |
| 3394 | return false; |
Douglas Gregor | 9a636e8 | 2011-06-17 05:31:46 +0000 | [diff] [blame] | 3395 | |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3396 | Result = SubstituteAutoTransform(*this, DeducedType).TransformType(Type); |
Douglas Gregor | 9a636e8 | 2011-06-17 05:31:46 +0000 | [diff] [blame] | 3397 | |
| 3398 | // Check that the deduced argument type is compatible with the original |
| 3399 | // argument type per C++ [temp.deduct.call]p4. |
| 3400 | if (Result && |
| 3401 | CheckOriginalCallArgDeduction(*this, |
| 3402 | Sema::OriginalCallArg(FuncParam,0,InitType), |
| 3403 | Result->getType())) { |
| 3404 | Result = 0; |
| 3405 | return false; |
| 3406 | } |
| 3407 | |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 3408 | return true; |
| 3409 | } |
| 3410 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3411 | static void |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3412 | MarkUsedTemplateParameters(Sema &SemaRef, QualType T, |
| 3413 | bool OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3414 | unsigned Level, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3415 | SmallVectorImpl<bool> &Deduced); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3416 | |
| 3417 | /// \brief If this is a non-static member function, |
Douglas Gregor | 77bc572 | 2010-11-12 23:44:13 +0000 | [diff] [blame] | 3418 | static void MaybeAddImplicitObjectParameterType(ASTContext &Context, |
| 3419 | CXXMethodDecl *Method, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3420 | SmallVectorImpl<QualType> &ArgTypes) { |
Douglas Gregor | 77bc572 | 2010-11-12 23:44:13 +0000 | [diff] [blame] | 3421 | if (Method->isStatic()) |
| 3422 | return; |
| 3423 | |
| 3424 | // C++ [over.match.funcs]p4: |
| 3425 | // |
| 3426 | // For non-static member functions, the type of the implicit |
| 3427 | // object parameter is |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame] | 3428 | // - "lvalue reference to cv X" for functions declared without a |
Douglas Gregor | 77bc572 | 2010-11-12 23:44:13 +0000 | [diff] [blame] | 3429 | // ref-qualifier or with the & ref-qualifier |
| 3430 | // - "rvalue reference to cv X" for functions declared with the |
| 3431 | // && ref-qualifier |
| 3432 | // |
| 3433 | // FIXME: We don't have ref-qualifiers yet, so we don't do that part. |
| 3434 | QualType ArgTy = Context.getTypeDeclType(Method->getParent()); |
| 3435 | ArgTy = Context.getQualifiedType(ArgTy, |
| 3436 | Qualifiers::fromCVRMask(Method->getTypeQualifiers())); |
| 3437 | ArgTy = Context.getLValueReferenceType(ArgTy); |
| 3438 | ArgTypes.push_back(ArgTy); |
| 3439 | } |
| 3440 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3441 | /// \brief Determine whether the function template \p FT1 is at least as |
| 3442 | /// specialized as \p FT2. |
| 3443 | static bool isAtLeastAsSpecializedAs(Sema &S, |
John McCall | 5769d61 | 2010-02-08 23:07:23 +0000 | [diff] [blame] | 3444 | SourceLocation Loc, |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3445 | FunctionTemplateDecl *FT1, |
| 3446 | FunctionTemplateDecl *FT2, |
| 3447 | TemplatePartialOrderingContext TPOC, |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3448 | unsigned NumCallArguments, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3449 | SmallVectorImpl<RefParamPartialOrderingComparison> *RefParamComparisons) { |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3450 | FunctionDecl *FD1 = FT1->getTemplatedDecl(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3451 | FunctionDecl *FD2 = FT2->getTemplatedDecl(); |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3452 | const FunctionProtoType *Proto1 = FD1->getType()->getAs<FunctionProtoType>(); |
| 3453 | const FunctionProtoType *Proto2 = FD2->getType()->getAs<FunctionProtoType>(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3454 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3455 | assert(Proto1 && Proto2 && "Function templates must have prototypes"); |
| 3456 | TemplateParameterList *TemplateParams = FT2->getTemplateParameters(); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3457 | SmallVector<DeducedTemplateArgument, 4> Deduced; |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3458 | Deduced.resize(TemplateParams->size()); |
| 3459 | |
| 3460 | // C++0x [temp.deduct.partial]p3: |
| 3461 | // The types used to determine the ordering depend on the context in which |
| 3462 | // the partial ordering is done: |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 3463 | TemplateDeductionInfo Info(S.Context, Loc); |
Douglas Gregor | 8d706ec | 2010-11-15 15:41:16 +0000 | [diff] [blame] | 3464 | CXXMethodDecl *Method1 = 0; |
| 3465 | CXXMethodDecl *Method2 = 0; |
| 3466 | bool IsNonStatic2 = false; |
| 3467 | bool IsNonStatic1 = false; |
| 3468 | unsigned Skip2 = 0; |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3469 | switch (TPOC) { |
| 3470 | case TPOC_Call: { |
| 3471 | // - In the context of a function call, the function parameter types are |
| 3472 | // used. |
Douglas Gregor | 8d706ec | 2010-11-15 15:41:16 +0000 | [diff] [blame] | 3473 | Method1 = dyn_cast<CXXMethodDecl>(FD1); |
| 3474 | Method2 = dyn_cast<CXXMethodDecl>(FD2); |
| 3475 | IsNonStatic1 = Method1 && !Method1->isStatic(); |
| 3476 | IsNonStatic2 = Method2 && !Method2->isStatic(); |
| 3477 | |
| 3478 | // C++0x [temp.func.order]p3: |
| 3479 | // [...] If only one of the function templates is a non-static |
| 3480 | // member, that function template is considered to have a new |
| 3481 | // first parameter inserted in its function parameter list. The |
| 3482 | // new parameter is of type "reference to cv A," where cv are |
| 3483 | // the cv-qualifiers of the function template (if any) and A is |
| 3484 | // the class of which the function template is a member. |
| 3485 | // |
| 3486 | // C++98/03 doesn't have this provision, so instead we drop the |
| 3487 | // first argument of the free function or static member, which |
| 3488 | // seems to match existing practice. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3489 | SmallVector<QualType, 4> Args1; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3490 | unsigned Skip1 = !S.getLangOptions().CPlusPlus0x && |
Douglas Gregor | 8d706ec | 2010-11-15 15:41:16 +0000 | [diff] [blame] | 3491 | IsNonStatic2 && !IsNonStatic1; |
| 3492 | if (S.getLangOptions().CPlusPlus0x && IsNonStatic1 && !IsNonStatic2) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3493 | MaybeAddImplicitObjectParameterType(S.Context, Method1, Args1); |
| 3494 | Args1.insert(Args1.end(), |
Douglas Gregor | 8d706ec | 2010-11-15 15:41:16 +0000 | [diff] [blame] | 3495 | Proto1->arg_type_begin() + Skip1, Proto1->arg_type_end()); |
Douglas Gregor | 77bc572 | 2010-11-12 23:44:13 +0000 | [diff] [blame] | 3496 | |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3497 | SmallVector<QualType, 4> Args2; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3498 | Skip2 = !S.getLangOptions().CPlusPlus0x && |
Douglas Gregor | 8d706ec | 2010-11-15 15:41:16 +0000 | [diff] [blame] | 3499 | IsNonStatic1 && !IsNonStatic2; |
| 3500 | if (S.getLangOptions().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) |
Douglas Gregor | 77bc572 | 2010-11-12 23:44:13 +0000 | [diff] [blame] | 3501 | MaybeAddImplicitObjectParameterType(S.Context, Method2, Args2); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3502 | Args2.insert(Args2.end(), |
Douglas Gregor | 8d706ec | 2010-11-15 15:41:16 +0000 | [diff] [blame] | 3503 | Proto2->arg_type_begin() + Skip2, Proto2->arg_type_end()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3504 | |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3505 | // C++ [temp.func.order]p5: |
| 3506 | // The presence of unused ellipsis and default arguments has no effect on |
| 3507 | // the partial ordering of function templates. |
| 3508 | if (Args1.size() > NumCallArguments) |
| 3509 | Args1.resize(NumCallArguments); |
| 3510 | if (Args2.size() > NumCallArguments) |
| 3511 | Args2.resize(NumCallArguments); |
| 3512 | if (DeduceTemplateArguments(S, TemplateParams, Args2.data(), Args2.size(), |
| 3513 | Args1.data(), Args1.size(), Info, Deduced, |
| 3514 | TDF_None, /*PartialOrdering=*/true, |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3515 | RefParamComparisons)) |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3516 | return false; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3517 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3518 | break; |
| 3519 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3520 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3521 | case TPOC_Conversion: |
| 3522 | // - In the context of a call to a conversion operator, the return types |
| 3523 | // of the conversion function templates are used. |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3524 | if (DeduceTemplateArguments(S, TemplateParams, Proto2->getResultType(), |
| 3525 | Proto1->getResultType(), Info, Deduced, |
| 3526 | TDF_None, /*PartialOrdering=*/true, |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3527 | RefParamComparisons)) |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3528 | return false; |
| 3529 | break; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3530 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3531 | case TPOC_Other: |
NAKAMURA Takumi | 0099530 | 2011-01-27 07:09:49 +0000 | [diff] [blame] | 3532 | // - In other contexts (14.6.6.2) the function template's function type |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3533 | // is used. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3534 | if (DeduceTemplateArguments(S, TemplateParams, FD2->getType(), |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3535 | FD1->getType(), Info, Deduced, TDF_None, |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3536 | /*PartialOrdering=*/true, RefParamComparisons)) |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3537 | return false; |
| 3538 | break; |
| 3539 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3540 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3541 | // C++0x [temp.deduct.partial]p11: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3542 | // In most cases, all template parameters must have values in order for |
| 3543 | // deduction to succeed, but for partial ordering purposes a template |
| 3544 | // parameter may remain without a value provided it is not used in the |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3545 | // types being used for partial ordering. [ Note: a template parameter used |
| 3546 | // in a non-deduced context is considered used. -end note] |
| 3547 | unsigned ArgIdx = 0, NumArgs = Deduced.size(); |
| 3548 | for (; ArgIdx != NumArgs; ++ArgIdx) |
| 3549 | if (Deduced[ArgIdx].isNull()) |
| 3550 | break; |
| 3551 | |
| 3552 | if (ArgIdx == NumArgs) { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3553 | // All template arguments were deduced. FT1 is at least as specialized |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3554 | // as FT2. |
| 3555 | return true; |
| 3556 | } |
| 3557 | |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3558 | // Figure out which template parameters were used. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3559 | SmallVector<bool, 4> UsedParameters; |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3560 | UsedParameters.resize(TemplateParams->size()); |
| 3561 | switch (TPOC) { |
| 3562 | case TPOC_Call: { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3563 | unsigned NumParams = std::min(NumCallArguments, |
| 3564 | std::min(Proto1->getNumArgs(), |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3565 | Proto2->getNumArgs())); |
Douglas Gregor | 8d706ec | 2010-11-15 15:41:16 +0000 | [diff] [blame] | 3566 | if (S.getLangOptions().CPlusPlus0x && IsNonStatic2 && !IsNonStatic1) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3567 | ::MarkUsedTemplateParameters(S, Method2->getThisType(S.Context), false, |
Douglas Gregor | 8d706ec | 2010-11-15 15:41:16 +0000 | [diff] [blame] | 3568 | TemplateParams->getDepth(), UsedParameters); |
| 3569 | for (unsigned I = Skip2; I < NumParams; ++I) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3570 | ::MarkUsedTemplateParameters(S, Proto2->getArgType(I), false, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3571 | TemplateParams->getDepth(), |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3572 | UsedParameters); |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3573 | break; |
| 3574 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3575 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3576 | case TPOC_Conversion: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3577 | ::MarkUsedTemplateParameters(S, Proto2->getResultType(), false, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3578 | TemplateParams->getDepth(), |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3579 | UsedParameters); |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3580 | break; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3581 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3582 | case TPOC_Other: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3583 | ::MarkUsedTemplateParameters(S, FD2->getType(), false, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3584 | TemplateParams->getDepth(), |
| 3585 | UsedParameters); |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3586 | break; |
| 3587 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3588 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3589 | for (; ArgIdx != NumArgs; ++ArgIdx) |
| 3590 | // If this argument had no value deduced but was used in one of the types |
| 3591 | // used for partial ordering, then deduction fails. |
| 3592 | if (Deduced[ArgIdx].isNull() && UsedParameters[ArgIdx]) |
| 3593 | return false; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3594 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3595 | return true; |
| 3596 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3597 | |
Douglas Gregor | 9da95e6 | 2011-01-16 16:03:23 +0000 | [diff] [blame] | 3598 | /// \brief Determine whether this a function template whose parameter-type-list |
| 3599 | /// ends with a function parameter pack. |
| 3600 | static bool isVariadicFunctionTemplate(FunctionTemplateDecl *FunTmpl) { |
| 3601 | FunctionDecl *Function = FunTmpl->getTemplatedDecl(); |
| 3602 | unsigned NumParams = Function->getNumParams(); |
| 3603 | if (NumParams == 0) |
| 3604 | return false; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3605 | |
Douglas Gregor | 9da95e6 | 2011-01-16 16:03:23 +0000 | [diff] [blame] | 3606 | ParmVarDecl *Last = Function->getParamDecl(NumParams - 1); |
| 3607 | if (!Last->isParameterPack()) |
| 3608 | return false; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3609 | |
Douglas Gregor | 9da95e6 | 2011-01-16 16:03:23 +0000 | [diff] [blame] | 3610 | // Make sure that no previous parameter is a parameter pack. |
| 3611 | while (--NumParams > 0) { |
| 3612 | if (Function->getParamDecl(NumParams - 1)->isParameterPack()) |
| 3613 | return false; |
| 3614 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3615 | |
Douglas Gregor | 9da95e6 | 2011-01-16 16:03:23 +0000 | [diff] [blame] | 3616 | return true; |
| 3617 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3618 | |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3619 | /// \brief Returns the more specialized function template according |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3620 | /// to the rules of function template partial ordering (C++ [temp.func.order]). |
| 3621 | /// |
| 3622 | /// \param FT1 the first function template |
| 3623 | /// |
| 3624 | /// \param FT2 the second function template |
| 3625 | /// |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3626 | /// \param TPOC the context in which we are performing partial ordering of |
| 3627 | /// function templates. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3628 | /// |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3629 | /// \param NumCallArguments The number of arguments in a call, used only |
| 3630 | /// when \c TPOC is \c TPOC_Call. |
| 3631 | /// |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3632 | /// \returns the more specialized function template. If neither |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3633 | /// template is more specialized, returns NULL. |
| 3634 | FunctionTemplateDecl * |
| 3635 | Sema::getMoreSpecializedTemplate(FunctionTemplateDecl *FT1, |
| 3636 | FunctionTemplateDecl *FT2, |
John McCall | 5769d61 | 2010-02-08 23:07:23 +0000 | [diff] [blame] | 3637 | SourceLocation Loc, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3638 | TemplatePartialOrderingContext TPOC, |
| 3639 | unsigned NumCallArguments) { |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3640 | SmallVector<RefParamPartialOrderingComparison, 4> RefParamComparisons; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3641 | bool Better1 = isAtLeastAsSpecializedAs(*this, Loc, FT1, FT2, TPOC, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3642 | NumCallArguments, 0); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3643 | bool Better2 = isAtLeastAsSpecializedAs(*this, Loc, FT2, FT1, TPOC, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3644 | NumCallArguments, |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3645 | &RefParamComparisons); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3646 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3647 | if (Better1 != Better2) // We have a clear winner |
| 3648 | return Better1? FT1 : FT2; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3649 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3650 | if (!Better1 && !Better2) // Neither is better than the other |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3651 | return 0; |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3652 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3653 | // C++0x [temp.deduct.partial]p10: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3654 | // If for each type being considered a given template is at least as |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3655 | // specialized for all types and more specialized for some set of types and |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3656 | // the other template is not more specialized for any types or is not at |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3657 | // least as specialized for any types, then the given template is more |
| 3658 | // specialized than the other template. Otherwise, neither template is more |
| 3659 | // specialized than the other. |
| 3660 | Better1 = false; |
| 3661 | Better2 = false; |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3662 | for (unsigned I = 0, N = RefParamComparisons.size(); I != N; ++I) { |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3663 | // C++0x [temp.deduct.partial]p9: |
| 3664 | // If, for a given type, deduction succeeds in both directions (i.e., the |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3665 | // types are identical after the transformations above) and both P and A |
| 3666 | // were reference types (before being replaced with the type referred to |
| 3667 | // above): |
| 3668 | |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3669 | // -- if the type from the argument template was an lvalue reference |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3670 | // and the type from the parameter template was not, the argument |
| 3671 | // type is considered to be more specialized than the other; |
| 3672 | // otherwise, |
| 3673 | if (!RefParamComparisons[I].ArgIsRvalueRef && |
| 3674 | RefParamComparisons[I].ParamIsRvalueRef) { |
| 3675 | Better2 = true; |
| 3676 | if (Better1) |
| 3677 | return 0; |
| 3678 | continue; |
| 3679 | } else if (!RefParamComparisons[I].ParamIsRvalueRef && |
| 3680 | RefParamComparisons[I].ArgIsRvalueRef) { |
| 3681 | Better1 = true; |
| 3682 | if (Better2) |
| 3683 | return 0; |
| 3684 | continue; |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3685 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3686 | |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3687 | // -- if the type from the argument template is more cv-qualified than |
| 3688 | // the type from the parameter template (as described above), the |
| 3689 | // argument type is considered to be more specialized than the |
| 3690 | // other; otherwise, |
| 3691 | switch (RefParamComparisons[I].Qualifiers) { |
| 3692 | case NeitherMoreQualified: |
| 3693 | break; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3694 | |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3695 | case ParamMoreQualified: |
| 3696 | Better1 = true; |
| 3697 | if (Better2) |
| 3698 | return 0; |
| 3699 | continue; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3700 | |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3701 | case ArgMoreQualified: |
| 3702 | Better2 = true; |
| 3703 | if (Better1) |
| 3704 | return 0; |
| 3705 | continue; |
| 3706 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3707 | |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3708 | // -- neither type is more specialized than the other. |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3709 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3710 | |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3711 | assert(!(Better1 && Better2) && "Should have broken out in the loop above"); |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3712 | if (Better1) |
| 3713 | return FT1; |
Douglas Gregor | 8a51491 | 2009-09-14 18:39:43 +0000 | [diff] [blame] | 3714 | else if (Better2) |
| 3715 | return FT2; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3716 | |
Douglas Gregor | 9da95e6 | 2011-01-16 16:03:23 +0000 | [diff] [blame] | 3717 | // FIXME: This mimics what GCC implements, but doesn't match up with the |
| 3718 | // proposed resolution for core issue 692. This area needs to be sorted out, |
| 3719 | // but for now we attempt to maintain compatibility. |
| 3720 | bool Variadic1 = isVariadicFunctionTemplate(FT1); |
| 3721 | bool Variadic2 = isVariadicFunctionTemplate(FT2); |
| 3722 | if (Variadic1 != Variadic2) |
| 3723 | return Variadic1? FT2 : FT1; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3724 | |
Douglas Gregor | 9da95e6 | 2011-01-16 16:03:23 +0000 | [diff] [blame] | 3725 | return 0; |
Douglas Gregor | 65ec1fd | 2009-08-21 23:19:43 +0000 | [diff] [blame] | 3726 | } |
Douglas Gregor | 83314aa | 2009-07-08 20:55:45 +0000 | [diff] [blame] | 3727 | |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3728 | /// \brief Determine if the two templates are equivalent. |
| 3729 | static bool isSameTemplate(TemplateDecl *T1, TemplateDecl *T2) { |
| 3730 | if (T1 == T2) |
| 3731 | return true; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3732 | |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3733 | if (!T1 || !T2) |
| 3734 | return false; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3735 | |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3736 | return T1->getCanonicalDecl() == T2->getCanonicalDecl(); |
| 3737 | } |
| 3738 | |
| 3739 | /// \brief Retrieve the most specialized of the given function template |
| 3740 | /// specializations. |
| 3741 | /// |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3742 | /// \param SpecBegin the start iterator of the function template |
| 3743 | /// specializations that we will be comparing. |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3744 | /// |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3745 | /// \param SpecEnd the end iterator of the function template |
| 3746 | /// specializations, paired with \p SpecBegin. |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3747 | /// |
| 3748 | /// \param TPOC the partial ordering context to use to compare the function |
| 3749 | /// template specializations. |
| 3750 | /// |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3751 | /// \param NumCallArguments The number of arguments in a call, used only |
| 3752 | /// when \c TPOC is \c TPOC_Call. |
| 3753 | /// |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3754 | /// \param Loc the location where the ambiguity or no-specializations |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3755 | /// diagnostic should occur. |
| 3756 | /// |
| 3757 | /// \param NoneDiag partial diagnostic used to diagnose cases where there are |
| 3758 | /// no matching candidates. |
| 3759 | /// |
| 3760 | /// \param AmbigDiag partial diagnostic used to diagnose an ambiguity, if one |
| 3761 | /// occurs. |
| 3762 | /// |
| 3763 | /// \param CandidateDiag partial diagnostic used for each function template |
| 3764 | /// specialization that is a candidate in the ambiguous ordering. One parameter |
| 3765 | /// in this diagnostic should be unbound, which will correspond to the string |
| 3766 | /// describing the template arguments for the function template specialization. |
| 3767 | /// |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3768 | /// \param Index if non-NULL and the result of this function is non-nULL, |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3769 | /// receives the index corresponding to the resulting function template |
| 3770 | /// specialization. |
| 3771 | /// |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3772 | /// \returns the most specialized function template specialization, if |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3773 | /// found. Otherwise, returns SpecEnd. |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3774 | /// |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3775 | /// \todo FIXME: Consider passing in the "also-ran" candidates that failed |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3776 | /// template argument deduction. |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3777 | UnresolvedSetIterator |
| 3778 | Sema::getMostSpecialized(UnresolvedSetIterator SpecBegin, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3779 | UnresolvedSetIterator SpecEnd, |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3780 | TemplatePartialOrderingContext TPOC, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3781 | unsigned NumCallArguments, |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3782 | SourceLocation Loc, |
| 3783 | const PartialDiagnostic &NoneDiag, |
| 3784 | const PartialDiagnostic &AmbigDiag, |
Douglas Gregor | 1be8eec | 2011-02-19 21:32:49 +0000 | [diff] [blame] | 3785 | const PartialDiagnostic &CandidateDiag, |
Richard Trieu | 6efd4c5 | 2011-11-23 22:32:32 +0000 | [diff] [blame] | 3786 | bool Complain, |
| 3787 | QualType TargetType) { |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3788 | if (SpecBegin == SpecEnd) { |
Douglas Gregor | 1be8eec | 2011-02-19 21:32:49 +0000 | [diff] [blame] | 3789 | if (Complain) |
| 3790 | Diag(Loc, NoneDiag); |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3791 | return SpecEnd; |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3792 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3793 | |
| 3794 | if (SpecBegin + 1 == SpecEnd) |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3795 | return SpecBegin; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3796 | |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3797 | // Find the function template that is better than all of the templates it |
| 3798 | // has been compared to. |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3799 | UnresolvedSetIterator Best = SpecBegin; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3800 | FunctionTemplateDecl *BestTemplate |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3801 | = cast<FunctionDecl>(*Best)->getPrimaryTemplate(); |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3802 | assert(BestTemplate && "Not a function template specialization?"); |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3803 | for (UnresolvedSetIterator I = SpecBegin + 1; I != SpecEnd; ++I) { |
| 3804 | FunctionTemplateDecl *Challenger |
| 3805 | = cast<FunctionDecl>(*I)->getPrimaryTemplate(); |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3806 | assert(Challenger && "Not a function template specialization?"); |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3807 | if (isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3808 | Loc, TPOC, NumCallArguments), |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3809 | Challenger)) { |
| 3810 | Best = I; |
| 3811 | BestTemplate = Challenger; |
| 3812 | } |
| 3813 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3814 | |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3815 | // Make sure that the "best" function template is more specialized than all |
| 3816 | // of the others. |
| 3817 | bool Ambiguous = false; |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3818 | for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { |
| 3819 | FunctionTemplateDecl *Challenger |
| 3820 | = cast<FunctionDecl>(*I)->getPrimaryTemplate(); |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3821 | if (I != Best && |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3822 | !isSameTemplate(getMoreSpecializedTemplate(BestTemplate, Challenger, |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3823 | Loc, TPOC, NumCallArguments), |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3824 | BestTemplate)) { |
| 3825 | Ambiguous = true; |
| 3826 | break; |
| 3827 | } |
| 3828 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3829 | |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3830 | if (!Ambiguous) { |
| 3831 | // We found an answer. Return it. |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3832 | return Best; |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3833 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3834 | |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3835 | // Diagnose the ambiguity. |
Douglas Gregor | 1be8eec | 2011-02-19 21:32:49 +0000 | [diff] [blame] | 3836 | if (Complain) |
| 3837 | Diag(Loc, AmbigDiag); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3838 | |
Douglas Gregor | 1be8eec | 2011-02-19 21:32:49 +0000 | [diff] [blame] | 3839 | if (Complain) |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3840 | // FIXME: Can we order the candidates in some sane way? |
Richard Trieu | 6efd4c5 | 2011-11-23 22:32:32 +0000 | [diff] [blame] | 3841 | for (UnresolvedSetIterator I = SpecBegin; I != SpecEnd; ++I) { |
| 3842 | PartialDiagnostic PD = CandidateDiag; |
| 3843 | PD << getTemplateArgumentBindingsText( |
Douglas Gregor | 1be8eec | 2011-02-19 21:32:49 +0000 | [diff] [blame] | 3844 | cast<FunctionDecl>(*I)->getPrimaryTemplate()->getTemplateParameters(), |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3845 | *cast<FunctionDecl>(*I)->getTemplateSpecializationArgs()); |
Richard Trieu | 6efd4c5 | 2011-11-23 22:32:32 +0000 | [diff] [blame] | 3846 | if (!TargetType.isNull()) |
| 3847 | HandleFunctionTypeMismatch(PD, cast<FunctionDecl>(*I)->getType(), |
| 3848 | TargetType); |
| 3849 | Diag((*I)->getLocation(), PD); |
| 3850 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3851 | |
John McCall | c373d48 | 2010-01-27 01:50:18 +0000 | [diff] [blame] | 3852 | return SpecEnd; |
Douglas Gregor | d5a423b | 2009-09-25 18:43:00 +0000 | [diff] [blame] | 3853 | } |
| 3854 | |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3855 | /// \brief Returns the more specialized class template partial specialization |
| 3856 | /// according to the rules of partial ordering of class template partial |
| 3857 | /// specializations (C++ [temp.class.order]). |
| 3858 | /// |
| 3859 | /// \param PS1 the first class template partial specialization |
| 3860 | /// |
| 3861 | /// \param PS2 the second class template partial specialization |
| 3862 | /// |
| 3863 | /// \returns the more specialized class template partial specialization. If |
| 3864 | /// neither partial specialization is more specialized, returns NULL. |
| 3865 | ClassTemplatePartialSpecializationDecl * |
| 3866 | Sema::getMoreSpecializedPartialSpecialization( |
| 3867 | ClassTemplatePartialSpecializationDecl *PS1, |
John McCall | 5769d61 | 2010-02-08 23:07:23 +0000 | [diff] [blame] | 3868 | ClassTemplatePartialSpecializationDecl *PS2, |
| 3869 | SourceLocation Loc) { |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3870 | // C++ [temp.class.order]p1: |
| 3871 | // For two class template partial specializations, the first is at least as |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3872 | // specialized as the second if, given the following rewrite to two |
| 3873 | // function templates, the first function template is at least as |
| 3874 | // specialized as the second according to the ordering rules for function |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3875 | // templates (14.6.6.2): |
| 3876 | // - the first function template has the same template parameters as the |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3877 | // first partial specialization and has a single function parameter |
| 3878 | // whose type is a class template specialization with the template |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3879 | // arguments of the first partial specialization, and |
| 3880 | // - the second function template has the same template parameters as the |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3881 | // second partial specialization and has a single function parameter |
| 3882 | // whose type is a class template specialization with the template |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3883 | // arguments of the second partial specialization. |
| 3884 | // |
Douglas Gregor | 31dce8f | 2010-04-29 06:21:43 +0000 | [diff] [blame] | 3885 | // Rather than synthesize function templates, we merely perform the |
| 3886 | // equivalent partial ordering by performing deduction directly on |
| 3887 | // the template arguments of the class template partial |
| 3888 | // specializations. This computation is slightly simpler than the |
| 3889 | // general problem of function template partial ordering, because |
| 3890 | // class template partial specializations are more constrained. We |
| 3891 | // know that every template parameter is deducible from the class |
| 3892 | // template partial specialization's template arguments, for |
| 3893 | // example. |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3894 | SmallVector<DeducedTemplateArgument, 4> Deduced; |
John McCall | 2a7fb27 | 2010-08-25 05:32:35 +0000 | [diff] [blame] | 3895 | TemplateDeductionInfo Info(Context, Loc); |
John McCall | 31f17ec | 2010-04-27 00:57:59 +0000 | [diff] [blame] | 3896 | |
| 3897 | QualType PT1 = PS1->getInjectedSpecializationType(); |
| 3898 | QualType PT2 = PS2->getInjectedSpecializationType(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3899 | |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3900 | // Determine whether PS1 is at least as specialized as PS2 |
| 3901 | Deduced.resize(PS2->getTemplateParameters()->size()); |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3902 | bool Better1 = !::DeduceTemplateArguments(*this, PS2->getTemplateParameters(), |
| 3903 | PT2, PT1, Info, Deduced, TDF_None, |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3904 | /*PartialOrdering=*/true, |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3905 | /*RefParamComparisons=*/0); |
Argyrios Kyrtzidis | 2c4792c | 2010-11-05 23:25:18 +0000 | [diff] [blame] | 3906 | if (Better1) { |
| 3907 | InstantiatingTemplate Inst(*this, PS2->getLocation(), PS2, |
| 3908 | Deduced.data(), Deduced.size(), Info); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3909 | Better1 = !::FinishTemplateArgumentDeduction(*this, PS2, |
| 3910 | PS1->getTemplateArgs(), |
Douglas Gregor | 516e6e0 | 2010-04-29 06:31:36 +0000 | [diff] [blame] | 3911 | Deduced, Info); |
Argyrios Kyrtzidis | 2c4792c | 2010-11-05 23:25:18 +0000 | [diff] [blame] | 3912 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3913 | |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3914 | // Determine whether PS2 is at least as specialized as PS1 |
Douglas Gregor | db0d4b7 | 2009-11-11 23:06:43 +0000 | [diff] [blame] | 3915 | Deduced.clear(); |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3916 | Deduced.resize(PS1->getTemplateParameters()->size()); |
Douglas Gregor | 5c7bf42 | 2011-01-11 17:34:58 +0000 | [diff] [blame] | 3917 | bool Better2 = !::DeduceTemplateArguments(*this, PS1->getTemplateParameters(), |
| 3918 | PT1, PT2, Info, Deduced, TDF_None, |
| 3919 | /*PartialOrdering=*/true, |
Douglas Gregor | b939a19 | 2011-01-21 17:29:42 +0000 | [diff] [blame] | 3920 | /*RefParamComparisons=*/0); |
Argyrios Kyrtzidis | 2c4792c | 2010-11-05 23:25:18 +0000 | [diff] [blame] | 3921 | if (Better2) { |
| 3922 | InstantiatingTemplate Inst(*this, PS1->getLocation(), PS1, |
| 3923 | Deduced.data(), Deduced.size(), Info); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3924 | Better2 = !::FinishTemplateArgumentDeduction(*this, PS1, |
| 3925 | PS2->getTemplateArgs(), |
Douglas Gregor | 516e6e0 | 2010-04-29 06:31:36 +0000 | [diff] [blame] | 3926 | Deduced, Info); |
Argyrios Kyrtzidis | 2c4792c | 2010-11-05 23:25:18 +0000 | [diff] [blame] | 3927 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3928 | |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3929 | if (Better1 == Better2) |
| 3930 | return 0; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3931 | |
Douglas Gregor | bf4ea56 | 2009-09-15 16:23:51 +0000 | [diff] [blame] | 3932 | return Better1? PS1 : PS2; |
| 3933 | } |
| 3934 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3935 | static void |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3936 | MarkUsedTemplateParameters(Sema &SemaRef, |
| 3937 | const TemplateArgument &TemplateArg, |
| 3938 | bool OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3939 | unsigned Depth, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3940 | SmallVectorImpl<bool> &Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 3941 | |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3942 | /// \brief Mark the template parameters that are used by the given |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 3943 | /// expression. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3944 | static void |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3945 | MarkUsedTemplateParameters(Sema &SemaRef, |
| 3946 | const Expr *E, |
| 3947 | bool OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3948 | unsigned Depth, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3949 | SmallVectorImpl<bool> &Used) { |
Douglas Gregor | be230c3 | 2011-01-03 17:17:50 +0000 | [diff] [blame] | 3950 | // We can deduce from a pack expansion. |
| 3951 | if (const PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(E)) |
| 3952 | E = Expansion->getPattern(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3953 | |
Douglas Gregor | 54c53cc | 2011-01-04 23:35:54 +0000 | [diff] [blame] | 3954 | // Skip through any implicit casts we added while type-checking. |
| 3955 | while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) |
| 3956 | E = ICE->getSubExpr(); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3957 | |
| 3958 | // FIXME: if !OnlyDeduced, we have to walk the whole subexpression to |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3959 | // find other occurrences of template parameters. |
Douglas Gregor | f6ddb73 | 2009-06-18 18:45:36 +0000 | [diff] [blame] | 3960 | const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E); |
Douglas Gregor | c781f9c | 2010-01-14 18:13:22 +0000 | [diff] [blame] | 3961 | if (!DRE) |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 3962 | return; |
| 3963 | |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 3964 | const NonTypeTemplateParmDecl *NTTP |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 3965 | = dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); |
| 3966 | if (!NTTP) |
| 3967 | return; |
| 3968 | |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3969 | if (NTTP->getDepth() == Depth) |
| 3970 | Used[NTTP->getIndex()] = true; |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 3971 | } |
| 3972 | |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3973 | /// \brief Mark the template parameters that are used by the given |
| 3974 | /// nested name specifier. |
| 3975 | static void |
| 3976 | MarkUsedTemplateParameters(Sema &SemaRef, |
| 3977 | NestedNameSpecifier *NNS, |
| 3978 | bool OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3979 | unsigned Depth, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3980 | SmallVectorImpl<bool> &Used) { |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3981 | if (!NNS) |
| 3982 | return; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3983 | |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3984 | MarkUsedTemplateParameters(SemaRef, NNS->getPrefix(), OnlyDeduced, Depth, |
| 3985 | Used); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3986 | MarkUsedTemplateParameters(SemaRef, QualType(NNS->getAsType(), 0), |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3987 | OnlyDeduced, Depth, Used); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3988 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 3989 | |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3990 | /// \brief Mark the template parameters that are used by the given |
| 3991 | /// template name. |
| 3992 | static void |
| 3993 | MarkUsedTemplateParameters(Sema &SemaRef, |
| 3994 | TemplateName Name, |
| 3995 | bool OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 3996 | unsigned Depth, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 3997 | SmallVectorImpl<bool> &Used) { |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 3998 | if (TemplateDecl *Template = Name.getAsTemplateDecl()) { |
| 3999 | if (TemplateTemplateParmDecl *TTP |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4000 | = dyn_cast<TemplateTemplateParmDecl>(Template)) { |
| 4001 | if (TTP->getDepth() == Depth) |
| 4002 | Used[TTP->getIndex()] = true; |
| 4003 | } |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4004 | return; |
| 4005 | } |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4006 | |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 4007 | if (QualifiedTemplateName *QTN = Name.getAsQualifiedTemplateName()) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4008 | MarkUsedTemplateParameters(SemaRef, QTN->getQualifier(), OnlyDeduced, |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 4009 | Depth, Used); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4010 | if (DependentTemplateName *DTN = Name.getAsDependentTemplateName()) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4011 | MarkUsedTemplateParameters(SemaRef, DTN->getQualifier(), OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4012 | Depth, Used); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4013 | } |
| 4014 | |
| 4015 | /// \brief Mark the template parameters that are used by the given |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4016 | /// type. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 4017 | static void |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4018 | MarkUsedTemplateParameters(Sema &SemaRef, QualType T, |
| 4019 | bool OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4020 | unsigned Depth, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 4021 | SmallVectorImpl<bool> &Used) { |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4022 | if (T.isNull()) |
| 4023 | return; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4024 | |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4025 | // Non-dependent types have nothing deducible |
| 4026 | if (!T->isDependentType()) |
| 4027 | return; |
| 4028 | |
| 4029 | T = SemaRef.Context.getCanonicalType(T); |
| 4030 | switch (T->getTypeClass()) { |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4031 | case Type::Pointer: |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4032 | MarkUsedTemplateParameters(SemaRef, |
| 4033 | cast<PointerType>(T)->getPointeeType(), |
| 4034 | OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4035 | Depth, |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4036 | Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4037 | break; |
| 4038 | |
| 4039 | case Type::BlockPointer: |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4040 | MarkUsedTemplateParameters(SemaRef, |
| 4041 | cast<BlockPointerType>(T)->getPointeeType(), |
| 4042 | OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4043 | Depth, |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4044 | Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4045 | break; |
| 4046 | |
| 4047 | case Type::LValueReference: |
| 4048 | case Type::RValueReference: |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4049 | MarkUsedTemplateParameters(SemaRef, |
| 4050 | cast<ReferenceType>(T)->getPointeeType(), |
| 4051 | OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4052 | Depth, |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4053 | Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4054 | break; |
| 4055 | |
| 4056 | case Type::MemberPointer: { |
| 4057 | const MemberPointerType *MemPtr = cast<MemberPointerType>(T.getTypePtr()); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4058 | MarkUsedTemplateParameters(SemaRef, MemPtr->getPointeeType(), OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4059 | Depth, Used); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4060 | MarkUsedTemplateParameters(SemaRef, QualType(MemPtr->getClass(), 0), |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4061 | OnlyDeduced, Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4062 | break; |
| 4063 | } |
| 4064 | |
| 4065 | case Type::DependentSizedArray: |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4066 | MarkUsedTemplateParameters(SemaRef, |
| 4067 | cast<DependentSizedArrayType>(T)->getSizeExpr(), |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4068 | OnlyDeduced, Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4069 | // Fall through to check the element type |
| 4070 | |
| 4071 | case Type::ConstantArray: |
| 4072 | case Type::IncompleteArray: |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4073 | MarkUsedTemplateParameters(SemaRef, |
| 4074 | cast<ArrayType>(T)->getElementType(), |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4075 | OnlyDeduced, Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4076 | break; |
| 4077 | |
| 4078 | case Type::Vector: |
| 4079 | case Type::ExtVector: |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4080 | MarkUsedTemplateParameters(SemaRef, |
| 4081 | cast<VectorType>(T)->getElementType(), |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4082 | OnlyDeduced, Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4083 | break; |
| 4084 | |
Douglas Gregor | 9cdda0c | 2009-06-17 21:51:59 +0000 | [diff] [blame] | 4085 | case Type::DependentSizedExtVector: { |
| 4086 | const DependentSizedExtVectorType *VecType |
Douglas Gregor | f6ddb73 | 2009-06-18 18:45:36 +0000 | [diff] [blame] | 4087 | = cast<DependentSizedExtVectorType>(T); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4088 | MarkUsedTemplateParameters(SemaRef, VecType->getElementType(), OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4089 | Depth, Used); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4090 | MarkUsedTemplateParameters(SemaRef, VecType->getSizeExpr(), OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4091 | Depth, Used); |
Douglas Gregor | 9cdda0c | 2009-06-17 21:51:59 +0000 | [diff] [blame] | 4092 | break; |
| 4093 | } |
| 4094 | |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4095 | case Type::FunctionProto: { |
Douglas Gregor | f6ddb73 | 2009-06-18 18:45:36 +0000 | [diff] [blame] | 4096 | const FunctionProtoType *Proto = cast<FunctionProtoType>(T); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4097 | MarkUsedTemplateParameters(SemaRef, Proto->getResultType(), OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4098 | Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4099 | for (unsigned I = 0, N = Proto->getNumArgs(); I != N; ++I) |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4100 | MarkUsedTemplateParameters(SemaRef, Proto->getArgType(I), OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4101 | Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4102 | break; |
| 4103 | } |
| 4104 | |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4105 | case Type::TemplateTypeParm: { |
| 4106 | const TemplateTypeParmType *TTP = cast<TemplateTypeParmType>(T); |
| 4107 | if (TTP->getDepth() == Depth) |
| 4108 | Used[TTP->getIndex()] = true; |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4109 | break; |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4110 | } |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4111 | |
Douglas Gregor | 0bc15d9 | 2011-01-14 05:11:40 +0000 | [diff] [blame] | 4112 | case Type::SubstTemplateTypeParmPack: { |
| 4113 | const SubstTemplateTypeParmPackType *Subst |
| 4114 | = cast<SubstTemplateTypeParmPackType>(T); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4115 | MarkUsedTemplateParameters(SemaRef, |
Douglas Gregor | 0bc15d9 | 2011-01-14 05:11:40 +0000 | [diff] [blame] | 4116 | QualType(Subst->getReplacedParameter(), 0), |
| 4117 | OnlyDeduced, Depth, Used); |
| 4118 | MarkUsedTemplateParameters(SemaRef, Subst->getArgumentPack(), |
| 4119 | OnlyDeduced, Depth, Used); |
| 4120 | break; |
| 4121 | } |
| 4122 | |
John McCall | 31f17ec | 2010-04-27 00:57:59 +0000 | [diff] [blame] | 4123 | case Type::InjectedClassName: |
| 4124 | T = cast<InjectedClassNameType>(T)->getInjectedSpecializationType(); |
| 4125 | // fall through |
| 4126 | |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4127 | case Type::TemplateSpecialization: { |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 4128 | const TemplateSpecializationType *Spec |
Douglas Gregor | f6ddb73 | 2009-06-18 18:45:36 +0000 | [diff] [blame] | 4129 | = cast<TemplateSpecializationType>(T); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4130 | MarkUsedTemplateParameters(SemaRef, Spec->getTemplateName(), OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4131 | Depth, Used); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4132 | |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 4133 | // C++0x [temp.deduct.type]p9: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4134 | // If the template argument list of P contains a pack expansion that is not |
| 4135 | // the last template argument, the entire template argument list is a |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 4136 | // non-deduced context. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4137 | if (OnlyDeduced && |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 4138 | hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) |
| 4139 | break; |
| 4140 | |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4141 | for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4142 | MarkUsedTemplateParameters(SemaRef, Spec->getArg(I), OnlyDeduced, Depth, |
| 4143 | Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4144 | break; |
| 4145 | } |
| 4146 | |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4147 | case Type::Complex: |
| 4148 | if (!OnlyDeduced) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4149 | MarkUsedTemplateParameters(SemaRef, |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4150 | cast<ComplexType>(T)->getElementType(), |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4151 | OnlyDeduced, Depth, Used); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4152 | break; |
| 4153 | |
Eli Friedman | b001de7 | 2011-10-06 23:00:33 +0000 | [diff] [blame] | 4154 | case Type::Atomic: |
| 4155 | if (!OnlyDeduced) |
| 4156 | MarkUsedTemplateParameters(SemaRef, |
| 4157 | cast<AtomicType>(T)->getValueType(), |
| 4158 | OnlyDeduced, Depth, Used); |
| 4159 | break; |
| 4160 | |
Douglas Gregor | 4714c12 | 2010-03-31 17:34:00 +0000 | [diff] [blame] | 4161 | case Type::DependentName: |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4162 | if (!OnlyDeduced) |
| 4163 | MarkUsedTemplateParameters(SemaRef, |
Douglas Gregor | 4714c12 | 2010-03-31 17:34:00 +0000 | [diff] [blame] | 4164 | cast<DependentNameType>(T)->getQualifier(), |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4165 | OnlyDeduced, Depth, Used); |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4166 | break; |
| 4167 | |
John McCall | 3350095 | 2010-06-11 00:33:02 +0000 | [diff] [blame] | 4168 | case Type::DependentTemplateSpecialization: { |
| 4169 | const DependentTemplateSpecializationType *Spec |
| 4170 | = cast<DependentTemplateSpecializationType>(T); |
| 4171 | if (!OnlyDeduced) |
| 4172 | MarkUsedTemplateParameters(SemaRef, Spec->getQualifier(), |
| 4173 | OnlyDeduced, Depth, Used); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4174 | |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 4175 | // C++0x [temp.deduct.type]p9: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4176 | // If the template argument list of P contains a pack expansion that is not |
| 4177 | // the last template argument, the entire template argument list is a |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 4178 | // non-deduced context. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4179 | if (OnlyDeduced && |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 4180 | hasPackExpansionBeforeEnd(Spec->getArgs(), Spec->getNumArgs())) |
| 4181 | break; |
| 4182 | |
John McCall | 3350095 | 2010-06-11 00:33:02 +0000 | [diff] [blame] | 4183 | for (unsigned I = 0, N = Spec->getNumArgs(); I != N; ++I) |
| 4184 | MarkUsedTemplateParameters(SemaRef, Spec->getArg(I), OnlyDeduced, Depth, |
| 4185 | Used); |
| 4186 | break; |
| 4187 | } |
| 4188 | |
John McCall | ad5e738 | 2010-03-01 23:49:17 +0000 | [diff] [blame] | 4189 | case Type::TypeOf: |
| 4190 | if (!OnlyDeduced) |
| 4191 | MarkUsedTemplateParameters(SemaRef, |
| 4192 | cast<TypeOfType>(T)->getUnderlyingType(), |
| 4193 | OnlyDeduced, Depth, Used); |
| 4194 | break; |
| 4195 | |
| 4196 | case Type::TypeOfExpr: |
| 4197 | if (!OnlyDeduced) |
| 4198 | MarkUsedTemplateParameters(SemaRef, |
| 4199 | cast<TypeOfExprType>(T)->getUnderlyingExpr(), |
| 4200 | OnlyDeduced, Depth, Used); |
| 4201 | break; |
| 4202 | |
| 4203 | case Type::Decltype: |
| 4204 | if (!OnlyDeduced) |
| 4205 | MarkUsedTemplateParameters(SemaRef, |
| 4206 | cast<DecltypeType>(T)->getUnderlyingExpr(), |
| 4207 | OnlyDeduced, Depth, Used); |
| 4208 | break; |
| 4209 | |
Sean Hunt | ca63c20 | 2011-05-24 22:41:36 +0000 | [diff] [blame] | 4210 | case Type::UnaryTransform: |
| 4211 | if (!OnlyDeduced) |
| 4212 | MarkUsedTemplateParameters(SemaRef, |
| 4213 | cast<UnaryTransformType>(T)->getUnderlyingType(), |
| 4214 | OnlyDeduced, Depth, Used); |
| 4215 | break; |
| 4216 | |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 4217 | case Type::PackExpansion: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4218 | MarkUsedTemplateParameters(SemaRef, |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 4219 | cast<PackExpansionType>(T)->getPattern(), |
| 4220 | OnlyDeduced, Depth, Used); |
| 4221 | break; |
| 4222 | |
Richard Smith | 34b41d9 | 2011-02-20 03:19:35 +0000 | [diff] [blame] | 4223 | case Type::Auto: |
| 4224 | MarkUsedTemplateParameters(SemaRef, |
| 4225 | cast<AutoType>(T)->getDeducedType(), |
| 4226 | OnlyDeduced, Depth, Used); |
| 4227 | |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4228 | // None of these types have any template parameters in them. |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4229 | case Type::Builtin: |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4230 | case Type::VariableArray: |
| 4231 | case Type::FunctionNoProto: |
| 4232 | case Type::Record: |
| 4233 | case Type::Enum: |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4234 | case Type::ObjCInterface: |
John McCall | c12c5bb | 2010-05-15 11:32:37 +0000 | [diff] [blame] | 4235 | case Type::ObjCObject: |
Steve Naroff | d1b3c2d | 2009-06-17 22:40:22 +0000 | [diff] [blame] | 4236 | case Type::ObjCObjectPointer: |
John McCall | ed97649 | 2009-12-04 22:46:56 +0000 | [diff] [blame] | 4237 | case Type::UnresolvedUsing: |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4238 | #define TYPE(Class, Base) |
| 4239 | #define ABSTRACT_TYPE(Class, Base) |
| 4240 | #define DEPENDENT_TYPE(Class, Base) |
| 4241 | #define NON_CANONICAL_TYPE(Class, Base) case Type::Class: |
| 4242 | #include "clang/AST/TypeNodes.def" |
| 4243 | break; |
| 4244 | } |
| 4245 | } |
| 4246 | |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4247 | /// \brief Mark the template parameters that are used by this |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4248 | /// template argument. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 4249 | static void |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4250 | MarkUsedTemplateParameters(Sema &SemaRef, |
| 4251 | const TemplateArgument &TemplateArg, |
| 4252 | bool OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4253 | unsigned Depth, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 4254 | SmallVectorImpl<bool> &Used) { |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4255 | switch (TemplateArg.getKind()) { |
| 4256 | case TemplateArgument::Null: |
| 4257 | case TemplateArgument::Integral: |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 4258 | case TemplateArgument::Declaration: |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4259 | break; |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 4260 | |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4261 | case TemplateArgument::Type: |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4262 | MarkUsedTemplateParameters(SemaRef, TemplateArg.getAsType(), OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4263 | Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4264 | break; |
| 4265 | |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 4266 | case TemplateArgument::Template: |
Douglas Gregor | a7fc901 | 2011-01-05 18:58:31 +0000 | [diff] [blame] | 4267 | case TemplateArgument::TemplateExpansion: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4268 | MarkUsedTemplateParameters(SemaRef, |
| 4269 | TemplateArg.getAsTemplateOrTemplatePattern(), |
Douglas Gregor | 788cd06 | 2009-11-11 01:00:40 +0000 | [diff] [blame] | 4270 | OnlyDeduced, Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4271 | break; |
| 4272 | |
| 4273 | case TemplateArgument::Expression: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4274 | MarkUsedTemplateParameters(SemaRef, TemplateArg.getAsExpr(), OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4275 | Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4276 | break; |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4277 | |
Anders Carlsson | d01b1da | 2009-06-15 17:04:53 +0000 | [diff] [blame] | 4278 | case TemplateArgument::Pack: |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4279 | for (TemplateArgument::pack_iterator P = TemplateArg.pack_begin(), |
| 4280 | PEnd = TemplateArg.pack_end(); |
| 4281 | P != PEnd; ++P) |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4282 | MarkUsedTemplateParameters(SemaRef, *P, OnlyDeduced, Depth, Used); |
Anders Carlsson | d01b1da | 2009-06-15 17:04:53 +0000 | [diff] [blame] | 4283 | break; |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4284 | } |
| 4285 | } |
| 4286 | |
| 4287 | /// \brief Mark the template parameters can be deduced by the given |
| 4288 | /// template argument list. |
| 4289 | /// |
| 4290 | /// \param TemplateArgs the template argument list from which template |
| 4291 | /// parameters will be deduced. |
| 4292 | /// |
| 4293 | /// \param Deduced a bit vector whose elements will be set to \c true |
| 4294 | /// to indicate when the corresponding template parameter will be |
| 4295 | /// deduced. |
Mike Stump | 1eb4433 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 4296 | void |
Douglas Gregor | e73bb60 | 2009-09-14 21:25:05 +0000 | [diff] [blame] | 4297 | Sema::MarkUsedTemplateParameters(const TemplateArgumentList &TemplateArgs, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4298 | bool OnlyDeduced, unsigned Depth, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 4299 | SmallVectorImpl<bool> &Used) { |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 4300 | // C++0x [temp.deduct.type]p9: |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4301 | // If the template argument list of P contains a pack expansion that is not |
| 4302 | // the last template argument, the entire template argument list is a |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 4303 | // non-deduced context. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4304 | if (OnlyDeduced && |
Douglas Gregor | 7b976ec | 2010-12-23 01:24:45 +0000 | [diff] [blame] | 4305 | hasPackExpansionBeforeEnd(TemplateArgs.data(), TemplateArgs.size())) |
| 4306 | return; |
| 4307 | |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4308 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4309 | ::MarkUsedTemplateParameters(*this, TemplateArgs[I], OnlyDeduced, |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4310 | Depth, Used); |
Douglas Gregor | 031a588 | 2009-06-13 00:26:55 +0000 | [diff] [blame] | 4311 | } |
Douglas Gregor | 63f07c5 | 2009-09-18 23:21:38 +0000 | [diff] [blame] | 4312 | |
| 4313 | /// \brief Marks all of the template parameters that will be deduced by a |
| 4314 | /// call to the given function template. |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4315 | void |
Douglas Gregor | 02024a9 | 2010-03-28 02:42:43 +0000 | [diff] [blame] | 4316 | Sema::MarkDeducedTemplateParameters(FunctionTemplateDecl *FunctionTemplate, |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 4317 | SmallVectorImpl<bool> &Deduced) { |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4318 | TemplateParameterList *TemplateParams |
Douglas Gregor | 63f07c5 | 2009-09-18 23:21:38 +0000 | [diff] [blame] | 4319 | = FunctionTemplate->getTemplateParameters(); |
| 4320 | Deduced.clear(); |
| 4321 | Deduced.resize(TemplateParams->size()); |
NAKAMURA Takumi | dfbb02a | 2011-01-27 07:10:08 +0000 | [diff] [blame] | 4322 | |
Douglas Gregor | 63f07c5 | 2009-09-18 23:21:38 +0000 | [diff] [blame] | 4323 | FunctionDecl *Function = FunctionTemplate->getTemplatedDecl(); |
| 4324 | for (unsigned I = 0, N = Function->getNumParams(); I != N; ++I) |
| 4325 | ::MarkUsedTemplateParameters(*this, Function->getParamDecl(I)->getType(), |
Douglas Gregor | ed9c0f9 | 2009-10-29 00:04:11 +0000 | [diff] [blame] | 4326 | true, TemplateParams->getDepth(), Deduced); |
Douglas Gregor | 63f07c5 | 2009-09-18 23:21:38 +0000 | [diff] [blame] | 4327 | } |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 4328 | |
| 4329 | bool hasDeducibleTemplateParameters(Sema &S, |
| 4330 | FunctionTemplateDecl *FunctionTemplate, |
| 4331 | QualType T) { |
| 4332 | if (!T->isDependentType()) |
| 4333 | return false; |
| 4334 | |
| 4335 | TemplateParameterList *TemplateParams |
| 4336 | = FunctionTemplate->getTemplateParameters(); |
Chris Lattner | 5f9e272 | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 4337 | SmallVector<bool, 4> Deduced; |
Douglas Gregor | dbfb371 | 2011-06-16 16:50:48 +0000 | [diff] [blame] | 4338 | Deduced.resize(TemplateParams->size()); |
| 4339 | ::MarkUsedTemplateParameters(S, T, true, TemplateParams->getDepth(), |
| 4340 | Deduced); |
| 4341 | |
| 4342 | for (unsigned I = 0, N = Deduced.size(); I != N; ++I) |
| 4343 | if (Deduced[I]) |
| 4344 | return true; |
| 4345 | |
| 4346 | return false; |
| 4347 | } |