Douglas Gregor | c463335 | 2010-12-15 17:38:57 +0000 | [diff] [blame] | 1 | //===------- SemaTemplateVariadic.cpp - C++ Variadic Templates ------------===/ |
| 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 semantic analysis for C++0x variadic templates. |
| 10 | //===----------------------------------------------------------------------===/ |
| 11 | |
| 12 | #include "clang/Sema/Sema.h" |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 13 | #include "clang/Sema/ParsedTemplate.h" |
Douglas Gregor | c463335 | 2010-12-15 17:38:57 +0000 | [diff] [blame] | 14 | #include "clang/Sema/SemaInternal.h" |
Douglas Gregor | 8491ffe | 2010-12-20 22:05:00 +0000 | [diff] [blame] | 15 | #include "clang/Sema/Template.h" |
Douglas Gregor | c463335 | 2010-12-15 17:38:57 +0000 | [diff] [blame] | 16 | #include "clang/AST/Expr.h" |
Douglas Gregor | 9ef7589 | 2010-12-15 19:43:21 +0000 | [diff] [blame] | 17 | #include "clang/AST/RecursiveASTVisitor.h" |
Douglas Gregor | c463335 | 2010-12-15 17:38:57 +0000 | [diff] [blame] | 18 | #include "clang/AST/TypeLoc.h" |
| 19 | |
| 20 | using namespace clang; |
| 21 | |
Douglas Gregor | 9ef7589 | 2010-12-15 19:43:21 +0000 | [diff] [blame] | 22 | //---------------------------------------------------------------------------- |
| 23 | // Visitor that collects unexpanded parameter packs |
| 24 | //---------------------------------------------------------------------------- |
| 25 | |
Douglas Gregor | 9ef7589 | 2010-12-15 19:43:21 +0000 | [diff] [blame] | 26 | namespace { |
| 27 | /// \brief A class that collects unexpanded parameter packs. |
| 28 | class CollectUnexpandedParameterPacksVisitor : |
| 29 | public RecursiveASTVisitor<CollectUnexpandedParameterPacksVisitor> |
| 30 | { |
| 31 | typedef RecursiveASTVisitor<CollectUnexpandedParameterPacksVisitor> |
| 32 | inherited; |
| 33 | |
| 34 | llvm::SmallVectorImpl<UnexpandedParameterPack> &Unexpanded; |
| 35 | |
| 36 | public: |
| 37 | explicit CollectUnexpandedParameterPacksVisitor( |
| 38 | llvm::SmallVectorImpl<UnexpandedParameterPack> &Unexpanded) |
| 39 | : Unexpanded(Unexpanded) { } |
| 40 | |
Douglas Gregor | a40bc72 | 2010-12-20 23:07:20 +0000 | [diff] [blame] | 41 | bool shouldWalkTypesOfTypeLocs() const { return false; } |
| 42 | |
Douglas Gregor | 9ef7589 | 2010-12-15 19:43:21 +0000 | [diff] [blame] | 43 | //------------------------------------------------------------------------ |
| 44 | // Recording occurrences of (unexpanded) parameter packs. |
| 45 | //------------------------------------------------------------------------ |
| 46 | |
| 47 | /// \brief Record occurrences of template type parameter packs. |
| 48 | bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) { |
| 49 | if (TL.getTypePtr()->isParameterPack()) |
| 50 | Unexpanded.push_back(std::make_pair(TL.getTypePtr(), TL.getNameLoc())); |
| 51 | return true; |
| 52 | } |
| 53 | |
| 54 | /// \brief Record occurrences of template type parameter packs |
| 55 | /// when we don't have proper source-location information for |
| 56 | /// them. |
| 57 | /// |
| 58 | /// Ideally, this routine would never be used. |
| 59 | bool VisitTemplateTypeParmType(TemplateTypeParmType *T) { |
| 60 | if (T->isParameterPack()) |
| 61 | Unexpanded.push_back(std::make_pair(T, SourceLocation())); |
| 62 | |
| 63 | return true; |
| 64 | } |
| 65 | |
| 66 | // FIXME: Record occurrences of non-type and template template |
| 67 | // parameter packs. |
| 68 | |
| 69 | // FIXME: Once we have pack expansions in the AST, block their |
| 70 | // traversal. |
| 71 | |
| 72 | //------------------------------------------------------------------------ |
| 73 | // Pruning the search for unexpanded parameter packs. |
| 74 | //------------------------------------------------------------------------ |
| 75 | |
| 76 | /// \brief Suppress traversal into statements and expressions that |
| 77 | /// do not contain unexpanded parameter packs. |
| 78 | bool TraverseStmt(Stmt *S) { |
| 79 | if (Expr *E = dyn_cast_or_null<Expr>(S)) |
| 80 | if (E->containsUnexpandedParameterPack()) |
| 81 | return inherited::TraverseStmt(E); |
| 82 | |
| 83 | return true; |
| 84 | } |
| 85 | |
| 86 | /// \brief Suppress traversal into types that do not contain |
| 87 | /// unexpanded parameter packs. |
| 88 | bool TraverseType(QualType T) { |
| 89 | if (!T.isNull() && T->containsUnexpandedParameterPack()) |
| 90 | return inherited::TraverseType(T); |
| 91 | |
| 92 | return true; |
| 93 | } |
| 94 | |
| 95 | /// \brief Suppress traversel into types with location information |
| 96 | /// that do not contain unexpanded parameter packs. |
| 97 | bool TraverseTypeLoc(TypeLoc TL) { |
| 98 | if (!TL.getType().isNull() && TL. |
| 99 | getType()->containsUnexpandedParameterPack()) |
| 100 | return inherited::TraverseTypeLoc(TL); |
| 101 | |
| 102 | return true; |
| 103 | } |
| 104 | |
Douglas Gregor | cff163e | 2010-12-15 21:57:59 +0000 | [diff] [blame] | 105 | /// \brief Suppress traversal of non-parameter declarations, since |
| 106 | /// they cannot contain unexpanded parameter packs. |
| 107 | bool TraverseDecl(Decl *D) { |
| 108 | if (D && isa<ParmVarDecl>(D)) |
| 109 | return inherited::TraverseDecl(D); |
| 110 | |
| 111 | return true; |
| 112 | } |
Douglas Gregor | 9ef7589 | 2010-12-15 19:43:21 +0000 | [diff] [blame] | 113 | }; |
| 114 | } |
| 115 | |
| 116 | /// \brief Diagnose all of the unexpanded parameter packs in the given |
| 117 | /// vector. |
| 118 | static void |
| 119 | DiagnoseUnexpandedParameterPacks(Sema &S, SourceLocation Loc, |
| 120 | Sema::UnexpandedParameterPackContext UPPC, |
| 121 | const llvm::SmallVectorImpl<UnexpandedParameterPack> &Unexpanded) { |
| 122 | llvm::SmallVector<SourceLocation, 4> Locations; |
| 123 | llvm::SmallVector<IdentifierInfo *, 4> Names; |
| 124 | llvm::SmallPtrSet<IdentifierInfo *, 4> NamesKnown; |
| 125 | |
| 126 | for (unsigned I = 0, N = Unexpanded.size(); I != N; ++I) { |
| 127 | IdentifierInfo *Name = 0; |
| 128 | if (const TemplateTypeParmType *TTP |
| 129 | = Unexpanded[I].first.dyn_cast<const TemplateTypeParmType *>()) |
| 130 | Name = TTP->getName(); |
| 131 | else |
| 132 | Name = Unexpanded[I].first.get<NamedDecl *>()->getIdentifier(); |
| 133 | |
| 134 | if (Name && NamesKnown.insert(Name)) |
| 135 | Names.push_back(Name); |
| 136 | |
| 137 | if (Unexpanded[I].second.isValid()) |
| 138 | Locations.push_back(Unexpanded[I].second); |
| 139 | } |
| 140 | |
| 141 | DiagnosticBuilder DB |
| 142 | = Names.size() == 0? S.Diag(Loc, diag::err_unexpanded_parameter_pack_0) |
| 143 | << (int)UPPC |
| 144 | : Names.size() == 1? S.Diag(Loc, diag::err_unexpanded_parameter_pack_1) |
| 145 | << (int)UPPC << Names[0] |
| 146 | : Names.size() == 2? S.Diag(Loc, diag::err_unexpanded_parameter_pack_2) |
| 147 | << (int)UPPC << Names[0] << Names[1] |
| 148 | : S.Diag(Loc, diag::err_unexpanded_parameter_pack_3_or_more) |
| 149 | << (int)UPPC << Names[0] << Names[1]; |
| 150 | |
| 151 | for (unsigned I = 0, N = Locations.size(); I != N; ++I) |
| 152 | DB << SourceRange(Locations[I]); |
| 153 | } |
| 154 | |
Douglas Gregor | c463335 | 2010-12-15 17:38:57 +0000 | [diff] [blame] | 155 | bool Sema::DiagnoseUnexpandedParameterPack(SourceLocation Loc, |
| 156 | TypeSourceInfo *T, |
| 157 | UnexpandedParameterPackContext UPPC) { |
| 158 | // C++0x [temp.variadic]p5: |
| 159 | // An appearance of a name of a parameter pack that is not expanded is |
| 160 | // ill-formed. |
| 161 | if (!T->getType()->containsUnexpandedParameterPack()) |
| 162 | return false; |
| 163 | |
Douglas Gregor | 9ef7589 | 2010-12-15 19:43:21 +0000 | [diff] [blame] | 164 | llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
| 165 | CollectUnexpandedParameterPacksVisitor(Unexpanded).TraverseTypeLoc( |
| 166 | T->getTypeLoc()); |
| 167 | assert(!Unexpanded.empty() && "Unable to find unexpanded parameter packs"); |
| 168 | DiagnoseUnexpandedParameterPacks(*this, Loc, UPPC, Unexpanded); |
Douglas Gregor | c463335 | 2010-12-15 17:38:57 +0000 | [diff] [blame] | 169 | return true; |
| 170 | } |
| 171 | |
| 172 | bool Sema::DiagnoseUnexpandedParameterPack(Expr *E, |
Douglas Gregor | 56c0458 | 2010-12-16 00:46:58 +0000 | [diff] [blame] | 173 | UnexpandedParameterPackContext UPPC) { |
Douglas Gregor | c463335 | 2010-12-15 17:38:57 +0000 | [diff] [blame] | 174 | // C++0x [temp.variadic]p5: |
| 175 | // An appearance of a name of a parameter pack that is not expanded is |
| 176 | // ill-formed. |
| 177 | if (!E->containsUnexpandedParameterPack()) |
| 178 | return false; |
| 179 | |
Douglas Gregor | 9ef7589 | 2010-12-15 19:43:21 +0000 | [diff] [blame] | 180 | llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
| 181 | CollectUnexpandedParameterPacksVisitor(Unexpanded).TraverseStmt(E); |
| 182 | assert(!Unexpanded.empty() && "Unable to find unexpanded parameter packs"); |
| 183 | DiagnoseUnexpandedParameterPacks(*this, E->getLocStart(), UPPC, Unexpanded); |
Douglas Gregor | c463335 | 2010-12-15 17:38:57 +0000 | [diff] [blame] | 184 | return true; |
| 185 | } |
Douglas Gregor | 56c0458 | 2010-12-16 00:46:58 +0000 | [diff] [blame] | 186 | |
| 187 | bool Sema::DiagnoseUnexpandedParameterPack(const CXXScopeSpec &SS, |
| 188 | UnexpandedParameterPackContext UPPC) { |
| 189 | // C++0x [temp.variadic]p5: |
| 190 | // An appearance of a name of a parameter pack that is not expanded is |
| 191 | // ill-formed. |
| 192 | if (!SS.getScopeRep() || |
| 193 | !SS.getScopeRep()->containsUnexpandedParameterPack()) |
| 194 | return false; |
| 195 | |
| 196 | llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
| 197 | CollectUnexpandedParameterPacksVisitor(Unexpanded) |
| 198 | .TraverseNestedNameSpecifier(SS.getScopeRep()); |
| 199 | assert(!Unexpanded.empty() && "Unable to find unexpanded parameter packs"); |
| 200 | DiagnoseUnexpandedParameterPacks(*this, SS.getRange().getBegin(), |
| 201 | UPPC, Unexpanded); |
| 202 | return true; |
| 203 | } |
| 204 | |
| 205 | bool Sema::DiagnoseUnexpandedParameterPack(const DeclarationNameInfo &NameInfo, |
| 206 | UnexpandedParameterPackContext UPPC) { |
| 207 | // C++0x [temp.variadic]p5: |
| 208 | // An appearance of a name of a parameter pack that is not expanded is |
| 209 | // ill-formed. |
| 210 | switch (NameInfo.getName().getNameKind()) { |
| 211 | case DeclarationName::Identifier: |
| 212 | case DeclarationName::ObjCZeroArgSelector: |
| 213 | case DeclarationName::ObjCOneArgSelector: |
| 214 | case DeclarationName::ObjCMultiArgSelector: |
| 215 | case DeclarationName::CXXOperatorName: |
| 216 | case DeclarationName::CXXLiteralOperatorName: |
| 217 | case DeclarationName::CXXUsingDirective: |
| 218 | return false; |
| 219 | |
| 220 | case DeclarationName::CXXConstructorName: |
| 221 | case DeclarationName::CXXDestructorName: |
| 222 | case DeclarationName::CXXConversionFunctionName: |
Douglas Gregor | 099ffe8 | 2010-12-16 17:19:19 +0000 | [diff] [blame] | 223 | // FIXME: We shouldn't need this null check! |
Douglas Gregor | 0762bfd | 2010-12-16 01:40:04 +0000 | [diff] [blame] | 224 | if (TypeSourceInfo *TSInfo = NameInfo.getNamedTypeInfo()) |
| 225 | return DiagnoseUnexpandedParameterPack(NameInfo.getLoc(), TSInfo, UPPC); |
| 226 | |
| 227 | if (!NameInfo.getName().getCXXNameType()->containsUnexpandedParameterPack()) |
Douglas Gregor | 56c0458 | 2010-12-16 00:46:58 +0000 | [diff] [blame] | 228 | return false; |
Douglas Gregor | 0762bfd | 2010-12-16 01:40:04 +0000 | [diff] [blame] | 229 | |
Douglas Gregor | 56c0458 | 2010-12-16 00:46:58 +0000 | [diff] [blame] | 230 | break; |
| 231 | } |
| 232 | |
| 233 | llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
| 234 | CollectUnexpandedParameterPacksVisitor(Unexpanded) |
Douglas Gregor | 0762bfd | 2010-12-16 01:40:04 +0000 | [diff] [blame] | 235 | .TraverseType(NameInfo.getName().getCXXNameType()); |
Douglas Gregor | 56c0458 | 2010-12-16 00:46:58 +0000 | [diff] [blame] | 236 | assert(!Unexpanded.empty() && "Unable to find unexpanded parameter packs"); |
| 237 | DiagnoseUnexpandedParameterPacks(*this, NameInfo.getLoc(), UPPC, Unexpanded); |
| 238 | return true; |
| 239 | } |
Douglas Gregor | 6f52675 | 2010-12-16 08:48:57 +0000 | [diff] [blame] | 240 | |
| 241 | bool Sema::DiagnoseUnexpandedParameterPack(SourceLocation Loc, |
| 242 | TemplateName Template, |
| 243 | UnexpandedParameterPackContext UPPC) { |
| 244 | |
| 245 | if (Template.isNull() || !Template.containsUnexpandedParameterPack()) |
| 246 | return false; |
| 247 | |
| 248 | llvm::SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
| 249 | CollectUnexpandedParameterPacksVisitor(Unexpanded) |
| 250 | .TraverseTemplateName(Template); |
| 251 | assert(!Unexpanded.empty() && "Unable to find unexpanded parameter packs"); |
| 252 | DiagnoseUnexpandedParameterPacks(*this, Loc, UPPC, Unexpanded); |
| 253 | return true; |
| 254 | } |
| 255 | |
Douglas Gregor | e02e262 | 2010-12-22 21:19:48 +0000 | [diff] [blame] | 256 | void Sema::collectUnexpandedParameterPacks(TemplateArgument Arg, |
| 257 | llvm::SmallVectorImpl<UnexpandedParameterPack> &Unexpanded) { |
| 258 | CollectUnexpandedParameterPacksVisitor(Unexpanded) |
| 259 | .TraverseTemplateArgument(Arg); |
| 260 | } |
| 261 | |
Douglas Gregor | 8491ffe | 2010-12-20 22:05:00 +0000 | [diff] [blame] | 262 | void Sema::collectUnexpandedParameterPacks(TemplateArgumentLoc Arg, |
| 263 | llvm::SmallVectorImpl<UnexpandedParameterPack> &Unexpanded) { |
| 264 | CollectUnexpandedParameterPacksVisitor(Unexpanded) |
| 265 | .TraverseTemplateArgumentLoc(Arg); |
| 266 | } |
| 267 | |
Douglas Gregor | b99268b | 2010-12-21 00:52:54 +0000 | [diff] [blame] | 268 | void Sema::collectUnexpandedParameterPacks(QualType T, |
| 269 | llvm::SmallVectorImpl<UnexpandedParameterPack> &Unexpanded) { |
| 270 | CollectUnexpandedParameterPacksVisitor(Unexpanded).TraverseType(T); |
| 271 | } |
| 272 | |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 273 | ParsedTemplateArgument |
| 274 | Sema::ActOnPackExpansion(const ParsedTemplateArgument &Arg, |
| 275 | SourceLocation EllipsisLoc) { |
| 276 | if (Arg.isInvalid()) |
| 277 | return Arg; |
| 278 | |
| 279 | switch (Arg.getKind()) { |
| 280 | case ParsedTemplateArgument::Type: { |
| 281 | TypeResult Result = ActOnPackExpansion(Arg.getAsType(), EllipsisLoc); |
| 282 | if (Result.isInvalid()) |
| 283 | return ParsedTemplateArgument(); |
| 284 | |
| 285 | return ParsedTemplateArgument(Arg.getKind(), Result.get().getAsOpaquePtr(), |
| 286 | Arg.getLocation()); |
| 287 | } |
| 288 | |
| 289 | case ParsedTemplateArgument::NonType: |
| 290 | Diag(EllipsisLoc, diag::err_pack_expansion_unsupported) |
| 291 | << 0; |
| 292 | return ParsedTemplateArgument(); |
| 293 | |
| 294 | case ParsedTemplateArgument::Template: |
| 295 | Diag(EllipsisLoc, diag::err_pack_expansion_unsupported) |
| 296 | << 1; |
| 297 | return ParsedTemplateArgument(); |
| 298 | } |
| 299 | llvm_unreachable("Unhandled template argument kind?"); |
| 300 | return ParsedTemplateArgument(); |
| 301 | } |
| 302 | |
| 303 | TypeResult Sema::ActOnPackExpansion(ParsedType Type, |
| 304 | SourceLocation EllipsisLoc) { |
| 305 | TypeSourceInfo *TSInfo; |
| 306 | GetTypeFromParser(Type, &TSInfo); |
| 307 | if (!TSInfo) |
| 308 | return true; |
| 309 | |
Douglas Gregor | 8491ffe | 2010-12-20 22:05:00 +0000 | [diff] [blame] | 310 | TypeSourceInfo *TSResult = CheckPackExpansion(TSInfo, EllipsisLoc); |
| 311 | if (!TSResult) |
| 312 | return true; |
| 313 | |
| 314 | return CreateParsedType(TSResult->getType(), TSResult); |
| 315 | } |
| 316 | |
| 317 | TypeSourceInfo *Sema::CheckPackExpansion(TypeSourceInfo *Pattern, |
| 318 | SourceLocation EllipsisLoc) { |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 319 | // C++0x [temp.variadic]p5: |
| 320 | // The pattern of a pack expansion shall name one or more |
| 321 | // parameter packs that are not expanded by a nested pack |
| 322 | // expansion. |
Douglas Gregor | 8491ffe | 2010-12-20 22:05:00 +0000 | [diff] [blame] | 323 | if (!Pattern->getType()->containsUnexpandedParameterPack()) { |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 324 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) |
Douglas Gregor | 8491ffe | 2010-12-20 22:05:00 +0000 | [diff] [blame] | 325 | << Pattern->getTypeLoc().getSourceRange(); |
| 326 | return 0; |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 327 | } |
Douglas Gregor | 8491ffe | 2010-12-20 22:05:00 +0000 | [diff] [blame] | 328 | |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 329 | // Create the pack expansion type and source-location information. |
Douglas Gregor | 8491ffe | 2010-12-20 22:05:00 +0000 | [diff] [blame] | 330 | QualType Result = Context.getPackExpansionType(Pattern->getType()); |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 331 | TypeSourceInfo *TSResult = Context.CreateTypeSourceInfo(Result); |
| 332 | PackExpansionTypeLoc TL = cast<PackExpansionTypeLoc>(TSResult->getTypeLoc()); |
| 333 | TL.setEllipsisLoc(EllipsisLoc); |
Douglas Gregor | 8491ffe | 2010-12-20 22:05:00 +0000 | [diff] [blame] | 334 | |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 335 | // Copy over the source-location information from the type. |
| 336 | memcpy(TL.getNextTypeLoc().getOpaqueData(), |
Douglas Gregor | 8491ffe | 2010-12-20 22:05:00 +0000 | [diff] [blame] | 337 | Pattern->getTypeLoc().getOpaqueData(), |
| 338 | Pattern->getTypeLoc().getFullDataSize()); |
| 339 | return TSResult; |
Douglas Gregor | 7536dd5 | 2010-12-20 02:24:11 +0000 | [diff] [blame] | 340 | } |
Douglas Gregor | b99268b | 2010-12-21 00:52:54 +0000 | [diff] [blame] | 341 | |
| 342 | |
| 343 | bool Sema::CheckParameterPacksForExpansion(SourceLocation EllipsisLoc, |
| 344 | SourceRange PatternRange, |
| 345 | const UnexpandedParameterPack *Unexpanded, |
| 346 | unsigned NumUnexpanded, |
| 347 | const MultiLevelTemplateArgumentList &TemplateArgs, |
| 348 | bool &ShouldExpand, |
| 349 | unsigned &NumExpansions) { |
| 350 | ShouldExpand = true; |
| 351 | std::pair<IdentifierInfo *, SourceLocation> FirstPack; |
| 352 | bool HaveFirstPack = false; |
| 353 | |
| 354 | for (unsigned I = 0; I != NumUnexpanded; ++I) { |
| 355 | // Compute the depth and index for this parameter pack. |
| 356 | unsigned Depth; |
| 357 | unsigned Index; |
| 358 | IdentifierInfo *Name; |
| 359 | |
| 360 | if (const TemplateTypeParmType *TTP |
| 361 | = Unexpanded[I].first.dyn_cast<const TemplateTypeParmType *>()) { |
| 362 | Depth = TTP->getDepth(); |
| 363 | Index = TTP->getIndex(); |
| 364 | Name = TTP->getName(); |
| 365 | } else { |
| 366 | NamedDecl *ND = Unexpanded[I].first.get<NamedDecl *>(); |
| 367 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(ND)) { |
| 368 | Depth = TTP->getDepth(); |
| 369 | Index = TTP->getIndex(); |
| 370 | } else if (NonTypeTemplateParmDecl *NTTP |
| 371 | = dyn_cast<NonTypeTemplateParmDecl>(ND)) { |
| 372 | Depth = NTTP->getDepth(); |
| 373 | Index = NTTP->getIndex(); |
| 374 | } else { |
| 375 | TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(ND); |
| 376 | Depth = TTP->getDepth(); |
| 377 | Index = TTP->getIndex(); |
| 378 | } |
| 379 | // FIXME: Variadic templates function parameter packs? |
| 380 | Name = ND->getIdentifier(); |
| 381 | } |
| 382 | |
| 383 | // If we don't have a template argument at this depth/index, then we |
| 384 | // cannot expand the pack expansion. Make a note of this, but we still |
| 385 | // want to check that any parameter packs we *do* have arguments for. |
| 386 | if (!TemplateArgs.hasTemplateArgument(Depth, Index)) { |
| 387 | ShouldExpand = false; |
| 388 | continue; |
| 389 | } |
| 390 | |
| 391 | // Determine the size of the argument pack. |
| 392 | unsigned NewPackSize = TemplateArgs(Depth, Index).pack_size(); |
| 393 | if (!HaveFirstPack) { |
| 394 | // The is the first pack we've seen for which we have an argument. |
| 395 | // Record it. |
| 396 | NumExpansions = NewPackSize; |
| 397 | FirstPack.first = Name; |
| 398 | FirstPack.second = Unexpanded[I].second; |
| 399 | HaveFirstPack = true; |
| 400 | continue; |
| 401 | } |
| 402 | |
| 403 | if (NewPackSize != NumExpansions) { |
| 404 | // C++0x [temp.variadic]p5: |
| 405 | // All of the parameter packs expanded by a pack expansion shall have |
| 406 | // the same number of arguments specified. |
| 407 | Diag(EllipsisLoc, diag::err_pack_expansion_length_conflict) |
| 408 | << FirstPack.first << Name << NumExpansions << NewPackSize |
| 409 | << SourceRange(FirstPack.second) << SourceRange(Unexpanded[I].second); |
| 410 | return true; |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | return false; |
| 415 | } |
Douglas Gregor | a8bc8c9 | 2010-12-23 22:44:42 +0000 | [diff] [blame^] | 416 | |
| 417 | bool Sema::containsUnexpandedParameterPacks(Declarator &D) { |
| 418 | const DeclSpec &DS = D.getDeclSpec(); |
| 419 | switch (DS.getTypeSpecType()) { |
| 420 | case TST_typename: |
| 421 | case TST_typeofType: { |
| 422 | QualType T = DS.getRepAsType().get(); |
| 423 | if (!T.isNull() && T->containsUnexpandedParameterPack()) |
| 424 | return true; |
| 425 | break; |
| 426 | } |
| 427 | |
| 428 | case TST_typeofExpr: |
| 429 | case TST_decltype: |
| 430 | if (DS.getRepAsExpr() && |
| 431 | DS.getRepAsExpr()->containsUnexpandedParameterPack()) |
| 432 | return true; |
| 433 | break; |
| 434 | |
| 435 | case TST_unspecified: |
| 436 | case TST_void: |
| 437 | case TST_char: |
| 438 | case TST_wchar: |
| 439 | case TST_char16: |
| 440 | case TST_char32: |
| 441 | case TST_int: |
| 442 | case TST_float: |
| 443 | case TST_double: |
| 444 | case TST_bool: |
| 445 | case TST_decimal32: |
| 446 | case TST_decimal64: |
| 447 | case TST_decimal128: |
| 448 | case TST_enum: |
| 449 | case TST_union: |
| 450 | case TST_struct: |
| 451 | case TST_class: |
| 452 | case TST_auto: |
| 453 | case TST_error: |
| 454 | break; |
| 455 | } |
| 456 | |
| 457 | for (unsigned I = 0, N = D.getNumTypeObjects(); I != N; ++I) { |
| 458 | const DeclaratorChunk &Chunk = D.getTypeObject(I); |
| 459 | switch (Chunk.Kind) { |
| 460 | case DeclaratorChunk::Pointer: |
| 461 | case DeclaratorChunk::Reference: |
| 462 | case DeclaratorChunk::Paren: |
| 463 | // These declarator chunks cannot contain any parameter packs. |
| 464 | break; |
| 465 | |
| 466 | case DeclaratorChunk::Array: |
| 467 | case DeclaratorChunk::Function: |
| 468 | case DeclaratorChunk::BlockPointer: |
| 469 | // Syntactically, these kinds of declarator chunks all come after the |
| 470 | // declarator-id (conceptually), so the parser should not invoke this |
| 471 | // routine at this time. |
| 472 | llvm_unreachable("Could not have seen this kind of declarator chunk"); |
| 473 | break; |
| 474 | |
| 475 | case DeclaratorChunk::MemberPointer: |
| 476 | if (Chunk.Mem.Scope().getScopeRep() && |
| 477 | Chunk.Mem.Scope().getScopeRep()->containsUnexpandedParameterPack()) |
| 478 | return true; |
| 479 | break; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | return false; |
| 484 | } |