SemaTemplateInstantiateDecl.cpp revision bf4ea56cdc376cef5a12abf6bf18dc34805c2226
1//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/ 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 instantiation for declarations. 10// 11//===----------------------------------------------------------------------===/ 12#include "Sema.h" 13#include "clang/AST/ASTConsumer.h" 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclTemplate.h" 16#include "clang/AST/DeclVisitor.h" 17#include "clang/AST/Expr.h" 18#include "clang/Basic/PrettyStackTrace.h" 19#include "clang/Lex/Preprocessor.h" 20#include "llvm/Support/Compiler.h" 21 22using namespace clang; 23 24namespace { 25 class VISIBILITY_HIDDEN TemplateDeclInstantiator 26 : public DeclVisitor<TemplateDeclInstantiator, Decl *> { 27 Sema &SemaRef; 28 DeclContext *Owner; 29 const MultiLevelTemplateArgumentList &TemplateArgs; 30 31 public: 32 typedef Sema::OwningExprResult OwningExprResult; 33 34 TemplateDeclInstantiator(Sema &SemaRef, DeclContext *Owner, 35 const MultiLevelTemplateArgumentList &TemplateArgs) 36 : SemaRef(SemaRef), Owner(Owner), TemplateArgs(TemplateArgs) { } 37 38 // FIXME: Once we get closer to completion, replace these manually-written 39 // declarations with automatically-generated ones from 40 // clang/AST/DeclNodes.def. 41 Decl *VisitTranslationUnitDecl(TranslationUnitDecl *D); 42 Decl *VisitNamespaceDecl(NamespaceDecl *D); 43 Decl *VisitTypedefDecl(TypedefDecl *D); 44 Decl *VisitVarDecl(VarDecl *D); 45 Decl *VisitFieldDecl(FieldDecl *D); 46 Decl *VisitStaticAssertDecl(StaticAssertDecl *D); 47 Decl *VisitEnumDecl(EnumDecl *D); 48 Decl *VisitEnumConstantDecl(EnumConstantDecl *D); 49 Decl *VisitFriendDecl(FriendDecl *D); 50 Decl *VisitFunctionDecl(FunctionDecl *D); 51 Decl *VisitCXXRecordDecl(CXXRecordDecl *D); 52 Decl *VisitCXXMethodDecl(CXXMethodDecl *D, 53 TemplateParameterList *TemplateParams = 0); 54 Decl *VisitCXXConstructorDecl(CXXConstructorDecl *D); 55 Decl *VisitCXXDestructorDecl(CXXDestructorDecl *D); 56 Decl *VisitCXXConversionDecl(CXXConversionDecl *D); 57 ParmVarDecl *VisitParmVarDecl(ParmVarDecl *D); 58 Decl *VisitOriginalParmVarDecl(OriginalParmVarDecl *D); 59 Decl *VisitClassTemplateDecl(ClassTemplateDecl *D); 60 Decl *VisitFunctionTemplateDecl(FunctionTemplateDecl *D); 61 Decl *VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D); 62 Decl *VisitUnresolvedUsingDecl(UnresolvedUsingDecl *D); 63 64 // Base case. FIXME: Remove once we can instantiate everything. 65 Decl *VisitDecl(Decl *) { 66 assert(false && "Template instantiation of unknown declaration kind!"); 67 return 0; 68 } 69 70 const LangOptions &getLangOptions() { 71 return SemaRef.getLangOptions(); 72 } 73 74 // Helper functions for instantiating methods. 75 QualType SubstFunctionType(FunctionDecl *D, 76 llvm::SmallVectorImpl<ParmVarDecl *> &Params); 77 bool InitFunctionInstantiation(FunctionDecl *New, FunctionDecl *Tmpl); 78 bool InitMethodInstantiation(CXXMethodDecl *New, CXXMethodDecl *Tmpl); 79 80 TemplateParameterList * 81 SubstTemplateParams(TemplateParameterList *List); 82 }; 83} 84 85Decl * 86TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) { 87 assert(false && "Translation units cannot be instantiated"); 88 return D; 89} 90 91Decl * 92TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) { 93 assert(false && "Namespaces cannot be instantiated"); 94 return D; 95} 96 97Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) { 98 bool Invalid = false; 99 QualType T = D->getUnderlyingType(); 100 if (T->isDependentType()) { 101 T = SemaRef.SubstType(T, TemplateArgs, 102 D->getLocation(), D->getDeclName()); 103 if (T.isNull()) { 104 Invalid = true; 105 T = SemaRef.Context.IntTy; 106 } 107 } 108 109 // Create the new typedef 110 TypedefDecl *Typedef 111 = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(), 112 D->getIdentifier(), T); 113 if (Invalid) 114 Typedef->setInvalidDecl(); 115 116 Owner->addDecl(Typedef); 117 118 return Typedef; 119} 120 121Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { 122 // Do substitution on the type of the declaration 123 QualType T = SemaRef.SubstType(D->getType(), TemplateArgs, 124 D->getTypeSpecStartLoc(), 125 D->getDeclName()); 126 if (T.isNull()) 127 return 0; 128 129 // Build the instantiated declaration 130 VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner, 131 D->getLocation(), D->getIdentifier(), 132 T, D->getDeclaratorInfo(), 133 D->getStorageClass()); 134 Var->setThreadSpecified(D->isThreadSpecified()); 135 Var->setCXXDirectInitializer(D->hasCXXDirectInitializer()); 136 Var->setDeclaredInCondition(D->isDeclaredInCondition()); 137 138 // If we are instantiating a static data member defined 139 // out-of-line, the instantiation will have the same lexical 140 // context (which will be a namespace scope) as the template. 141 if (D->isOutOfLine()) 142 Var->setLexicalDeclContext(D->getLexicalDeclContext()); 143 144 // FIXME: In theory, we could have a previous declaration for variables that 145 // are not static data members. 146 bool Redeclaration = false; 147 SemaRef.CheckVariableDeclaration(Var, 0, Redeclaration); 148 149 if (D->isOutOfLine()) { 150 D->getLexicalDeclContext()->addDecl(Var); 151 Owner->makeDeclVisibleInContext(Var); 152 } else { 153 Owner->addDecl(Var); 154 } 155 156 if (D->getInit()) { 157 OwningExprResult Init 158 = SemaRef.SubstExpr(D->getInit(), TemplateArgs); 159 if (Init.isInvalid()) 160 Var->setInvalidDecl(); 161 else if (ParenListExpr *PLE = dyn_cast<ParenListExpr>((Expr *)Init.get())) { 162 // FIXME: We're faking all of the comma locations, which is suboptimal. 163 // Do we even need these comma locations? 164 llvm::SmallVector<SourceLocation, 4> FakeCommaLocs; 165 if (PLE->getNumExprs() > 0) { 166 FakeCommaLocs.reserve(PLE->getNumExprs() - 1); 167 for (unsigned I = 0, N = PLE->getNumExprs() - 1; I != N; ++I) { 168 Expr *E = PLE->getExpr(I)->Retain(); 169 FakeCommaLocs.push_back( 170 SemaRef.PP.getLocForEndOfToken(E->getLocEnd())); 171 } 172 PLE->getExpr(PLE->getNumExprs() - 1)->Retain(); 173 } 174 175 // Add the direct initializer to the declaration. 176 SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var), 177 PLE->getLParenLoc(), 178 Sema::MultiExprArg(SemaRef, 179 (void**)PLE->getExprs(), 180 PLE->getNumExprs()), 181 FakeCommaLocs.data(), 182 PLE->getRParenLoc()); 183 184 // When Init is destroyed, it will destroy the instantiated ParenListExpr; 185 // we've explicitly retained all of its subexpressions already. 186 } else 187 SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init), 188 D->hasCXXDirectInitializer()); 189 } else if (!Var->isStaticDataMember() || Var->isOutOfLine()) 190 SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false); 191 192 // Link instantiations of static data members back to the template from 193 // which they were instantiated. 194 if (Var->isStaticDataMember()) 195 SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D); 196 197 return Var; 198} 199 200Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) { 201 bool Invalid = false; 202 QualType T = D->getType(); 203 if (T->isDependentType()) { 204 T = SemaRef.SubstType(T, TemplateArgs, 205 D->getLocation(), D->getDeclName()); 206 if (!T.isNull() && T->isFunctionType()) { 207 // C++ [temp.arg.type]p3: 208 // If a declaration acquires a function type through a type 209 // dependent on a template-parameter and this causes a 210 // declaration that does not use the syntactic form of a 211 // function declarator to have function type, the program is 212 // ill-formed. 213 SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function) 214 << T; 215 T = QualType(); 216 Invalid = true; 217 } 218 } 219 220 Expr *BitWidth = D->getBitWidth(); 221 if (Invalid) 222 BitWidth = 0; 223 else if (BitWidth) { 224 // The bit-width expression is not potentially evaluated. 225 EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); 226 227 OwningExprResult InstantiatedBitWidth 228 = SemaRef.SubstExpr(BitWidth, TemplateArgs); 229 if (InstantiatedBitWidth.isInvalid()) { 230 Invalid = true; 231 BitWidth = 0; 232 } else 233 BitWidth = InstantiatedBitWidth.takeAs<Expr>(); 234 } 235 236 FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), T, 237 D->getDeclaratorInfo(), 238 cast<RecordDecl>(Owner), 239 D->getLocation(), 240 D->isMutable(), 241 BitWidth, 242 D->getTypeSpecStartLoc(), 243 D->getAccess(), 244 0); 245 if (!Field) 246 return 0; 247 248 if (Invalid) 249 Field->setInvalidDecl(); 250 251 if (!Field->getDeclName()) { 252 // Keep track of where this decl came from. 253 SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D); 254 } 255 256 Field->setImplicit(D->isImplicit()); 257 Owner->addDecl(Field); 258 259 return Field; 260} 261 262Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) { 263 FriendDecl::FriendUnion FU; 264 265 // Handle friend type expressions by simply substituting template 266 // parameters into the pattern type. 267 if (Type *Ty = D->getFriendType()) { 268 QualType T = SemaRef.SubstType(QualType(Ty,0), TemplateArgs, 269 D->getLocation(), DeclarationName()); 270 if (T.isNull()) return 0; 271 272 assert(getLangOptions().CPlusPlus0x || T->isRecordType()); 273 FU = T.getTypePtr(); 274 275 // Handle everything else by appropriate substitution. 276 } else { 277 NamedDecl *ND = D->getFriendDecl(); 278 assert(ND && "friend decl must be a decl or a type!"); 279 280 Decl *NewND = Visit(ND); 281 if (!NewND) return 0; 282 283 FU = cast<NamedDecl>(NewND); 284 } 285 286 FriendDecl *FD = 287 FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), FU, 288 D->getFriendLoc()); 289 FD->setAccess(AS_public); 290 Owner->addDecl(FD); 291 return FD; 292} 293 294Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) { 295 Expr *AssertExpr = D->getAssertExpr(); 296 297 // The expression in a static assertion is not potentially evaluated. 298 EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); 299 300 OwningExprResult InstantiatedAssertExpr 301 = SemaRef.SubstExpr(AssertExpr, TemplateArgs); 302 if (InstantiatedAssertExpr.isInvalid()) 303 return 0; 304 305 OwningExprResult Message(SemaRef, D->getMessage()); 306 D->getMessage()->Retain(); 307 Decl *StaticAssert 308 = SemaRef.ActOnStaticAssertDeclaration(D->getLocation(), 309 move(InstantiatedAssertExpr), 310 move(Message)).getAs<Decl>(); 311 return StaticAssert; 312} 313 314Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) { 315 EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, 316 D->getLocation(), D->getIdentifier(), 317 D->getTagKeywordLoc(), 318 /*PrevDecl=*/0); 319 Enum->setInstantiationOfMemberEnum(D); 320 Enum->setAccess(D->getAccess()); 321 Owner->addDecl(Enum); 322 Enum->startDefinition(); 323 324 llvm::SmallVector<Sema::DeclPtrTy, 4> Enumerators; 325 326 EnumConstantDecl *LastEnumConst = 0; 327 for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(), 328 ECEnd = D->enumerator_end(); 329 EC != ECEnd; ++EC) { 330 // The specified value for the enumerator. 331 OwningExprResult Value = SemaRef.Owned((Expr *)0); 332 if (Expr *UninstValue = EC->getInitExpr()) { 333 // The enumerator's value expression is not potentially evaluated. 334 EnterExpressionEvaluationContext Unevaluated(SemaRef, 335 Action::Unevaluated); 336 337 Value = SemaRef.SubstExpr(UninstValue, TemplateArgs); 338 } 339 340 // Drop the initial value and continue. 341 bool isInvalid = false; 342 if (Value.isInvalid()) { 343 Value = SemaRef.Owned((Expr *)0); 344 isInvalid = true; 345 } 346 347 EnumConstantDecl *EnumConst 348 = SemaRef.CheckEnumConstant(Enum, LastEnumConst, 349 EC->getLocation(), EC->getIdentifier(), 350 move(Value)); 351 352 if (isInvalid) { 353 if (EnumConst) 354 EnumConst->setInvalidDecl(); 355 Enum->setInvalidDecl(); 356 } 357 358 if (EnumConst) { 359 Enum->addDecl(EnumConst); 360 Enumerators.push_back(Sema::DeclPtrTy::make(EnumConst)); 361 LastEnumConst = EnumConst; 362 } 363 } 364 365 // FIXME: Fixup LBraceLoc and RBraceLoc 366 // FIXME: Empty Scope and AttributeList (required to handle attribute packed). 367 SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(), 368 Sema::DeclPtrTy::make(Enum), 369 &Enumerators[0], Enumerators.size(), 370 0, 0); 371 372 return Enum; 373} 374 375Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) { 376 assert(false && "EnumConstantDecls can only occur within EnumDecls."); 377 return 0; 378} 379 380Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) { 381 TemplateParameterList *TempParams = D->getTemplateParameters(); 382 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 383 if (!InstParams) 384 return NULL; 385 386 CXXRecordDecl *Pattern = D->getTemplatedDecl(); 387 CXXRecordDecl *RecordInst 388 = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), Owner, 389 Pattern->getLocation(), Pattern->getIdentifier(), 390 Pattern->getTagKeywordLoc(), /*PrevDecl=*/ NULL); 391 392 ClassTemplateDecl *Inst 393 = ClassTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(), 394 D->getIdentifier(), InstParams, RecordInst, 0); 395 RecordInst->setDescribedClassTemplate(Inst); 396 Inst->setAccess(D->getAccess()); 397 Inst->setInstantiatedFromMemberTemplate(D); 398 399 Owner->addDecl(Inst); 400 return Inst; 401} 402 403Decl * 404TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) { 405 // FIXME: Dig out the out-of-line definition of this function template? 406 407 TemplateParameterList *TempParams = D->getTemplateParameters(); 408 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 409 if (!InstParams) 410 return NULL; 411 412 // FIXME: Handle instantiation of nested function templates that aren't 413 // member function templates. This could happen inside a FriendDecl. 414 assert(isa<CXXMethodDecl>(D->getTemplatedDecl())); 415 CXXMethodDecl *InstMethod 416 = cast_or_null<CXXMethodDecl>( 417 VisitCXXMethodDecl(cast<CXXMethodDecl>(D->getTemplatedDecl()), 418 InstParams)); 419 if (!InstMethod) 420 return 0; 421 422 // Link the instantiated function template declaration to the function 423 // template from which it was instantiated. 424 FunctionTemplateDecl *InstTemplate = InstMethod->getDescribedFunctionTemplate(); 425 assert(InstTemplate && "VisitCXXMethodDecl didn't create a template!"); 426 InstTemplate->setInstantiatedFromMemberTemplate(D); 427 Owner->addDecl(InstTemplate); 428 return InstTemplate; 429} 430 431Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) { 432 CXXRecordDecl *PrevDecl = 0; 433 if (D->isInjectedClassName()) 434 PrevDecl = cast<CXXRecordDecl>(Owner); 435 436 CXXRecordDecl *Record 437 = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner, 438 D->getLocation(), D->getIdentifier(), 439 D->getTagKeywordLoc(), PrevDecl); 440 Record->setImplicit(D->isImplicit()); 441 // FIXME: Check against AS_none is an ugly hack to work around the issue that 442 // the tag decls introduced by friend class declarations don't have an access 443 // specifier. Remove once this area of the code gets sorted out. 444 if (D->getAccess() != AS_none) 445 Record->setAccess(D->getAccess()); 446 if (!D->isInjectedClassName()) 447 Record->setInstantiationOfMemberClass(D); 448 449 // If the original function was part of a friend declaration, 450 // inherit its namespace state. 451 if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) 452 Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared); 453 454 Record->setAnonymousStructOrUnion(D->isAnonymousStructOrUnion()); 455 456 Owner->addDecl(Record); 457 return Record; 458} 459 460/// Normal class members are of more specific types and therefore 461/// don't make it here. This function serves two purposes: 462/// 1) instantiating function templates 463/// 2) substituting friend declarations 464/// FIXME: preserve function definitions in case #2 465Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D) { 466 // Check whether there is already a function template specialization for 467 // this declaration. 468 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 469 void *InsertPos = 0; 470 if (FunctionTemplate) { 471 llvm::FoldingSetNodeID ID; 472 FunctionTemplateSpecializationInfo::Profile(ID, 473 TemplateArgs.getInnermost().getFlatArgumentList(), 474 TemplateArgs.getInnermost().flat_size(), 475 SemaRef.Context); 476 477 FunctionTemplateSpecializationInfo *Info 478 = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, 479 InsertPos); 480 481 // If we already have a function template specialization, return it. 482 if (Info) 483 return Info->Function; 484 } 485 486 Sema::LocalInstantiationScope Scope(SemaRef); 487 488 llvm::SmallVector<ParmVarDecl *, 4> Params; 489 QualType T = SubstFunctionType(D, Params); 490 if (T.isNull()) 491 return 0; 492 493 // Build the instantiated method declaration. 494 DeclContext *DC = SemaRef.FindInstantiatedContext(D->getDeclContext()); 495 FunctionDecl *Function = 496 FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(), 497 D->getDeclName(), T, D->getDeclaratorInfo(), 498 D->getStorageClass(), 499 D->isInline(), D->hasWrittenPrototype()); 500 Function->setLexicalDeclContext(Owner); 501 502 // Attach the parameters 503 for (unsigned P = 0; P < Params.size(); ++P) 504 Params[P]->setOwningFunction(Function); 505 Function->setParams(SemaRef.Context, Params.data(), Params.size()); 506 507 // If the original function was part of a friend declaration, 508 // inherit its namespace state and add it to the owner. 509 if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) { 510 bool WasDeclared = (FOK == Decl::FOK_Declared); 511 Function->setObjectOfFriendDecl(WasDeclared); 512 if (!Owner->isDependentContext()) 513 DC->makeDeclVisibleInContext(Function, /* Recoverable = */ false); 514 515 Function->setInstantiationOfMemberFunction(D); 516 } 517 518 if (InitFunctionInstantiation(Function, D)) 519 Function->setInvalidDecl(); 520 521 bool Redeclaration = false; 522 bool OverloadableAttrRequired = false; 523 NamedDecl *PrevDecl = 0; 524 SemaRef.CheckFunctionDeclaration(Function, PrevDecl, Redeclaration, 525 /*FIXME:*/OverloadableAttrRequired); 526 527 if (FunctionTemplate) { 528 // Record this function template specialization. 529 Function->setFunctionTemplateSpecialization(SemaRef.Context, 530 FunctionTemplate, 531 &TemplateArgs.getInnermost(), 532 InsertPos); 533 } 534 535 return Function; 536} 537 538Decl * 539TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, 540 TemplateParameterList *TemplateParams) { 541 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 542 void *InsertPos = 0; 543 if (FunctionTemplate && !TemplateParams) { 544 // We are creating a function template specialization from a function 545 // template. Check whether there is already a function template 546 // specialization for this particular set of template arguments. 547 llvm::FoldingSetNodeID ID; 548 FunctionTemplateSpecializationInfo::Profile(ID, 549 TemplateArgs.getInnermost().getFlatArgumentList(), 550 TemplateArgs.getInnermost().flat_size(), 551 SemaRef.Context); 552 553 FunctionTemplateSpecializationInfo *Info 554 = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, 555 InsertPos); 556 557 // If we already have a function template specialization, return it. 558 if (Info) 559 return Info->Function; 560 } 561 562 Sema::LocalInstantiationScope Scope(SemaRef); 563 564 llvm::SmallVector<ParmVarDecl *, 4> Params; 565 QualType T = SubstFunctionType(D, Params); 566 if (T.isNull()) 567 return 0; 568 569 // Build the instantiated method declaration. 570 CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner); 571 CXXMethodDecl *Method = 0; 572 573 DeclarationName Name = D->getDeclName(); 574 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 575 QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); 576 Name = SemaRef.Context.DeclarationNames.getCXXConstructorName( 577 SemaRef.Context.getCanonicalType(ClassTy)); 578 Method = CXXConstructorDecl::Create(SemaRef.Context, Record, 579 Constructor->getLocation(), 580 Name, T, 581 Constructor->getDeclaratorInfo(), 582 Constructor->isExplicit(), 583 Constructor->isInline(), false); 584 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 585 QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); 586 Name = SemaRef.Context.DeclarationNames.getCXXDestructorName( 587 SemaRef.Context.getCanonicalType(ClassTy)); 588 Method = CXXDestructorDecl::Create(SemaRef.Context, Record, 589 Destructor->getLocation(), Name, 590 T, Destructor->isInline(), false); 591 } else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) { 592 CanQualType ConvTy 593 = SemaRef.Context.getCanonicalType( 594 T->getAsFunctionType()->getResultType()); 595 Name = SemaRef.Context.DeclarationNames.getCXXConversionFunctionName( 596 ConvTy); 597 Method = CXXConversionDecl::Create(SemaRef.Context, Record, 598 Conversion->getLocation(), Name, 599 T, Conversion->getDeclaratorInfo(), 600 Conversion->isInline(), 601 Conversion->isExplicit()); 602 } else { 603 Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(), 604 D->getDeclName(), T, D->getDeclaratorInfo(), 605 D->isStatic(), D->isInline()); 606 } 607 608 if (TemplateParams) { 609 // Our resulting instantiation is actually a function template, since we 610 // are substituting only the outer template parameters. For example, given 611 // 612 // template<typename T> 613 // struct X { 614 // template<typename U> void f(T, U); 615 // }; 616 // 617 // X<int> x; 618 // 619 // We are instantiating the member template "f" within X<int>, which means 620 // substituting int for T, but leaving "f" as a member function template. 621 // Build the function template itself. 622 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record, 623 Method->getLocation(), 624 Method->getDeclName(), 625 TemplateParams, Method); 626 if (D->isOutOfLine()) 627 FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); 628 Method->setDescribedFunctionTemplate(FunctionTemplate); 629 } else if (!FunctionTemplate) 630 Method->setInstantiationOfMemberFunction(D); 631 632 // If we are instantiating a member function defined 633 // out-of-line, the instantiation will have the same lexical 634 // context (which will be a namespace scope) as the template. 635 if (D->isOutOfLine()) 636 Method->setLexicalDeclContext(D->getLexicalDeclContext()); 637 638 // Attach the parameters 639 for (unsigned P = 0; P < Params.size(); ++P) 640 Params[P]->setOwningFunction(Method); 641 Method->setParams(SemaRef.Context, Params.data(), Params.size()); 642 643 if (InitMethodInstantiation(Method, D)) 644 Method->setInvalidDecl(); 645 646 NamedDecl *PrevDecl = 0; 647 648 if (!FunctionTemplate || TemplateParams) { 649 PrevDecl = SemaRef.LookupQualifiedName(Owner, Name, 650 Sema::LookupOrdinaryName, true); 651 652 // In C++, the previous declaration we find might be a tag type 653 // (class or enum). In this case, the new declaration will hide the 654 // tag type. Note that this does does not apply if we're declaring a 655 // typedef (C++ [dcl.typedef]p4). 656 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag) 657 PrevDecl = 0; 658 } 659 660 if (FunctionTemplate && !TemplateParams) 661 // Record this function template specialization. 662 Method->setFunctionTemplateSpecialization(SemaRef.Context, 663 FunctionTemplate, 664 &TemplateArgs.getInnermost(), 665 InsertPos); 666 667 bool Redeclaration = false; 668 bool OverloadableAttrRequired = false; 669 SemaRef.CheckFunctionDeclaration(Method, PrevDecl, Redeclaration, 670 /*FIXME:*/OverloadableAttrRequired); 671 672 if (!FunctionTemplate && (!Method->isInvalidDecl() || !PrevDecl)) 673 Owner->addDecl(Method); 674 675 return Method; 676} 677 678Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) { 679 return VisitCXXMethodDecl(D); 680} 681 682Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) { 683 return VisitCXXMethodDecl(D); 684} 685 686Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) { 687 return VisitCXXMethodDecl(D); 688} 689 690ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { 691 QualType OrigT = SemaRef.SubstType(D->getOriginalType(), TemplateArgs, 692 D->getLocation(), D->getDeclName()); 693 if (OrigT.isNull()) 694 return 0; 695 696 QualType T = SemaRef.adjustParameterType(OrigT); 697 698 // Allocate the parameter 699 ParmVarDecl *Param = 0; 700 if (T == OrigT) 701 Param = ParmVarDecl::Create(SemaRef.Context, Owner, D->getLocation(), 702 D->getIdentifier(), T, D->getDeclaratorInfo(), 703 D->getStorageClass(), 0); 704 else 705 Param = OriginalParmVarDecl::Create(SemaRef.Context, Owner, 706 D->getLocation(), D->getIdentifier(), 707 T, D->getDeclaratorInfo(), OrigT, 708 D->getStorageClass(), 0); 709 710 // Mark the default argument as being uninstantiated. 711 if (Expr *Arg = D->getDefaultArg()) 712 Param->setUninstantiatedDefaultArg(Arg); 713 714 // Note: we don't try to instantiate function parameters until after 715 // we've instantiated the function's type. Therefore, we don't have 716 // to check for 'void' parameter types here. 717 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 718 return Param; 719} 720 721Decl * 722TemplateDeclInstantiator::VisitOriginalParmVarDecl(OriginalParmVarDecl *D) { 723 // Since parameter types can decay either before or after 724 // instantiation, we simply treat OriginalParmVarDecls as 725 // ParmVarDecls the same way, and create one or the other depending 726 // on what happens after template instantiation. 727 return VisitParmVarDecl(D); 728} 729 730Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl( 731 TemplateTypeParmDecl *D) { 732 // TODO: don't always clone when decls are refcounted. 733 const Type* T = D->getTypeForDecl(); 734 assert(T->isTemplateTypeParmType()); 735 const TemplateTypeParmType *TTPT = T->getAs<TemplateTypeParmType>(); 736 737 TemplateTypeParmDecl *Inst = 738 TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 739 TTPT->getDepth(), TTPT->getIndex(), 740 TTPT->getName(), 741 D->wasDeclaredWithTypename(), 742 D->isParameterPack()); 743 744 if (D->hasDefaultArgument()) { 745 QualType DefaultPattern = D->getDefaultArgument(); 746 QualType DefaultInst 747 = SemaRef.SubstType(DefaultPattern, TemplateArgs, 748 D->getDefaultArgumentLoc(), 749 D->getDeclName()); 750 751 Inst->setDefaultArgument(DefaultInst, 752 D->getDefaultArgumentLoc(), 753 D->defaultArgumentWasInherited() /* preserve? */); 754 } 755 756 return Inst; 757} 758 759Decl * 760TemplateDeclInstantiator::VisitUnresolvedUsingDecl(UnresolvedUsingDecl *D) { 761 NestedNameSpecifier *NNS = 762 SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(), 763 D->getTargetNestedNameRange(), 764 TemplateArgs); 765 if (!NNS) 766 return 0; 767 768 CXXScopeSpec SS; 769 SS.setRange(D->getTargetNestedNameRange()); 770 SS.setScopeRep(NNS); 771 772 NamedDecl *UD = 773 SemaRef.BuildUsingDeclaration(D->getLocation(), SS, 774 D->getTargetNameLocation(), 775 D->getTargetName(), 0, D->isTypeName()); 776 if (UD) 777 SemaRef.Context.setInstantiatedFromUnresolvedUsingDecl(cast<UsingDecl>(UD), 778 D); 779 return UD; 780} 781 782Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner, 783 const MultiLevelTemplateArgumentList &TemplateArgs) { 784 TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs); 785 return Instantiator.Visit(D); 786} 787 788/// \brief Instantiates a nested template parameter list in the current 789/// instantiation context. 790/// 791/// \param L The parameter list to instantiate 792/// 793/// \returns NULL if there was an error 794TemplateParameterList * 795TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) { 796 // Get errors for all the parameters before bailing out. 797 bool Invalid = false; 798 799 unsigned N = L->size(); 800 typedef llvm::SmallVector<NamedDecl *, 8> ParamVector; 801 ParamVector Params; 802 Params.reserve(N); 803 for (TemplateParameterList::iterator PI = L->begin(), PE = L->end(); 804 PI != PE; ++PI) { 805 NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI)); 806 Params.push_back(D); 807 Invalid = Invalid || !D; 808 } 809 810 // Clean up if we had an error. 811 if (Invalid) { 812 for (ParamVector::iterator PI = Params.begin(), PE = Params.end(); 813 PI != PE; ++PI) 814 if (*PI) 815 (*PI)->Destroy(SemaRef.Context); 816 return NULL; 817 } 818 819 TemplateParameterList *InstL 820 = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(), 821 L->getLAngleLoc(), &Params.front(), N, 822 L->getRAngleLoc()); 823 return InstL; 824} 825 826/// \brief Does substitution on the type of the given function, including 827/// all of the function parameters. 828/// 829/// \param D The function whose type will be the basis of the substitution 830/// 831/// \param Params the instantiated parameter declarations 832 833/// \returns the instantiated function's type if successful, a NULL 834/// type if there was an error. 835QualType 836TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, 837 llvm::SmallVectorImpl<ParmVarDecl *> &Params) { 838 bool InvalidDecl = false; 839 840 // Substitute all of the function's formal parameter types. 841 TemplateDeclInstantiator ParamInstantiator(SemaRef, 0, TemplateArgs); 842 llvm::SmallVector<QualType, 4> ParamTys; 843 for (FunctionDecl::param_iterator P = D->param_begin(), 844 PEnd = D->param_end(); 845 P != PEnd; ++P) { 846 if (ParmVarDecl *PInst = ParamInstantiator.VisitParmVarDecl(*P)) { 847 if (PInst->getType()->isVoidType()) { 848 SemaRef.Diag(PInst->getLocation(), diag::err_param_with_void_type); 849 PInst->setInvalidDecl(); 850 } else if (SemaRef.RequireNonAbstractType(PInst->getLocation(), 851 PInst->getType(), 852 diag::err_abstract_type_in_decl, 853 Sema::AbstractParamType)) 854 PInst->setInvalidDecl(); 855 856 Params.push_back(PInst); 857 ParamTys.push_back(PInst->getType()); 858 859 if (PInst->isInvalidDecl()) 860 InvalidDecl = true; 861 } else 862 InvalidDecl = true; 863 } 864 865 // FIXME: Deallocate dead declarations. 866 if (InvalidDecl) 867 return QualType(); 868 869 const FunctionProtoType *Proto = D->getType()->getAsFunctionProtoType(); 870 assert(Proto && "Missing prototype?"); 871 QualType ResultType 872 = SemaRef.SubstType(Proto->getResultType(), TemplateArgs, 873 D->getLocation(), D->getDeclName()); 874 if (ResultType.isNull()) 875 return QualType(); 876 877 return SemaRef.BuildFunctionType(ResultType, ParamTys.data(), ParamTys.size(), 878 Proto->isVariadic(), Proto->getTypeQuals(), 879 D->getLocation(), D->getDeclName()); 880} 881 882/// \brief Initializes the common fields of an instantiation function 883/// declaration (New) from the corresponding fields of its template (Tmpl). 884/// 885/// \returns true if there was an error 886bool 887TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, 888 FunctionDecl *Tmpl) { 889 if (Tmpl->isDeleted()) 890 New->setDeleted(); 891 892 // If we are performing substituting explicitly-specified template arguments 893 // or deduced template arguments into a function template and we reach this 894 // point, we are now past the point where SFINAE applies and have committed 895 // to keeping the new function template specialization. We therefore 896 // convert the active template instantiation for the function template 897 // into a template instantiation for this specific function template 898 // specialization, which is not a SFINAE context, so that we diagnose any 899 // further errors in the declaration itself. 900 typedef Sema::ActiveTemplateInstantiation ActiveInstType; 901 ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back(); 902 if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution || 903 ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) { 904 if (FunctionTemplateDecl *FunTmpl 905 = dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) { 906 assert(FunTmpl->getTemplatedDecl() == Tmpl && 907 "Deduction from the wrong function template?"); 908 (void) FunTmpl; 909 ActiveInst.Kind = ActiveInstType::TemplateInstantiation; 910 ActiveInst.Entity = reinterpret_cast<uintptr_t>(New); 911 } 912 } 913 914 return false; 915} 916 917/// \brief Initializes common fields of an instantiated method 918/// declaration (New) from the corresponding fields of its template 919/// (Tmpl). 920/// 921/// \returns true if there was an error 922bool 923TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New, 924 CXXMethodDecl *Tmpl) { 925 if (InitFunctionInstantiation(New, Tmpl)) 926 return true; 927 928 CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner); 929 New->setAccess(Tmpl->getAccess()); 930 if (Tmpl->isVirtualAsWritten()) { 931 New->setVirtualAsWritten(true); 932 Record->setAggregate(false); 933 Record->setPOD(false); 934 Record->setEmpty(false); 935 Record->setPolymorphic(true); 936 } 937 if (Tmpl->isPure()) { 938 New->setPure(); 939 Record->setAbstract(true); 940 } 941 942 // FIXME: attributes 943 // FIXME: New needs a pointer to Tmpl 944 return false; 945} 946 947/// \brief Instantiate the definition of the given function from its 948/// template. 949/// 950/// \param PointOfInstantiation the point at which the instantiation was 951/// required. Note that this is not precisely a "point of instantiation" 952/// for the function, but it's close. 953/// 954/// \param Function the already-instantiated declaration of a 955/// function template specialization or member function of a class template 956/// specialization. 957/// 958/// \param Recursive if true, recursively instantiates any functions that 959/// are required by this instantiation. 960void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, 961 FunctionDecl *Function, 962 bool Recursive) { 963 if (Function->isInvalidDecl()) 964 return; 965 966 assert(!Function->getBody() && "Already instantiated!"); 967 968 // Find the function body that we'll be substituting. 969 const FunctionDecl *PatternDecl = 0; 970 if (FunctionTemplateDecl *Primary = Function->getPrimaryTemplate()) { 971 while (Primary->getInstantiatedFromMemberTemplate()) 972 Primary = Primary->getInstantiatedFromMemberTemplate(); 973 974 PatternDecl = Primary->getTemplatedDecl(); 975 } else 976 PatternDecl = Function->getInstantiatedFromMemberFunction(); 977 Stmt *Pattern = 0; 978 if (PatternDecl) 979 Pattern = PatternDecl->getBody(PatternDecl); 980 981 if (!Pattern) 982 return; 983 984 // C++0x [temp.explicit]p9: 985 // Except for inline functions, other explicit instantiation declarations 986 // have the effect of suppressing the implicit instantiation of the entity 987 // to which they refer. 988 if (Function->getTemplateSpecializationKind() 989 == TSK_ExplicitInstantiationDeclaration && 990 PatternDecl->isOutOfLine() && !PatternDecl->isInline()) 991 return; 992 993 InstantiatingTemplate Inst(*this, PointOfInstantiation, Function); 994 if (Inst) 995 return; 996 997 // If we're performing recursive template instantiation, create our own 998 // queue of pending implicit instantiations that we will instantiate later, 999 // while we're still within our own instantiation context. 1000 std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations; 1001 if (Recursive) 1002 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1003 1004 ActOnStartOfFunctionDef(0, DeclPtrTy::make(Function)); 1005 1006 // Introduce a new scope where local variable instantiations will be 1007 // recorded. 1008 LocalInstantiationScope Scope(*this); 1009 1010 // Introduce the instantiated function parameters into the local 1011 // instantiation scope. 1012 for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I) 1013 Scope.InstantiatedLocal(PatternDecl->getParamDecl(I), 1014 Function->getParamDecl(I)); 1015 1016 // Enter the scope of this instantiation. We don't use 1017 // PushDeclContext because we don't have a scope. 1018 DeclContext *PreviousContext = CurContext; 1019 CurContext = Function; 1020 1021 MultiLevelTemplateArgumentList TemplateArgs = 1022 getTemplateInstantiationArgs(Function); 1023 1024 // If this is a constructor, instantiate the member initializers. 1025 if (const CXXConstructorDecl *Ctor = 1026 dyn_cast<CXXConstructorDecl>(PatternDecl)) { 1027 InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor, 1028 TemplateArgs); 1029 } 1030 1031 // Instantiate the function body. 1032 OwningStmtResult Body = SubstStmt(Pattern, TemplateArgs); 1033 1034 if (Body.isInvalid()) 1035 Function->setInvalidDecl(); 1036 1037 ActOnFinishFunctionBody(DeclPtrTy::make(Function), move(Body), 1038 /*IsInstantiation=*/true); 1039 1040 CurContext = PreviousContext; 1041 1042 DeclGroupRef DG(Function); 1043 Consumer.HandleTopLevelDecl(DG); 1044 1045 if (Recursive) { 1046 // Instantiate any pending implicit instantiations found during the 1047 // instantiation of this template. 1048 PerformPendingImplicitInstantiations(); 1049 1050 // Restore the set of pending implicit instantiations. 1051 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1052 } 1053} 1054 1055/// \brief Instantiate the definition of the given variable from its 1056/// template. 1057/// 1058/// \param PointOfInstantiation the point at which the instantiation was 1059/// required. Note that this is not precisely a "point of instantiation" 1060/// for the function, but it's close. 1061/// 1062/// \param Var the already-instantiated declaration of a static member 1063/// variable of a class template specialization. 1064/// 1065/// \param Recursive if true, recursively instantiates any functions that 1066/// are required by this instantiation. 1067void Sema::InstantiateStaticDataMemberDefinition( 1068 SourceLocation PointOfInstantiation, 1069 VarDecl *Var, 1070 bool Recursive) { 1071 if (Var->isInvalidDecl()) 1072 return; 1073 1074 // Find the out-of-line definition of this static data member. 1075 // FIXME: Do we have to look for specializations separately? 1076 VarDecl *Def = Var->getInstantiatedFromStaticDataMember(); 1077 bool FoundOutOfLineDef = false; 1078 assert(Def && "This data member was not instantiated from a template?"); 1079 assert(Def->isStaticDataMember() && "Not a static data member?"); 1080 for (VarDecl::redecl_iterator RD = Def->redecls_begin(), 1081 RDEnd = Def->redecls_end(); 1082 RD != RDEnd; ++RD) { 1083 if (RD->getLexicalDeclContext()->isFileContext()) { 1084 Def = *RD; 1085 FoundOutOfLineDef = true; 1086 } 1087 } 1088 1089 if (!FoundOutOfLineDef) { 1090 // We did not find an out-of-line definition of this static data member, 1091 // so we won't perform any instantiation. Rather, we rely on the user to 1092 // instantiate this definition (or provide a specialization for it) in 1093 // another translation unit. 1094 return; 1095 } 1096 1097 // FIXME: extern templates 1098 1099 InstantiatingTemplate Inst(*this, PointOfInstantiation, Var); 1100 if (Inst) 1101 return; 1102 1103 // If we're performing recursive template instantiation, create our own 1104 // queue of pending implicit instantiations that we will instantiate later, 1105 // while we're still within our own instantiation context. 1106 std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations; 1107 if (Recursive) 1108 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1109 1110 // Enter the scope of this instantiation. We don't use 1111 // PushDeclContext because we don't have a scope. 1112 DeclContext *PreviousContext = CurContext; 1113 CurContext = Var->getDeclContext(); 1114 1115 Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(), 1116 getTemplateInstantiationArgs(Var))); 1117 1118 CurContext = PreviousContext; 1119 1120 if (Var) { 1121 DeclGroupRef DG(Var); 1122 Consumer.HandleTopLevelDecl(DG); 1123 } 1124 1125 if (Recursive) { 1126 // Instantiate any pending implicit instantiations found during the 1127 // instantiation of this template. 1128 PerformPendingImplicitInstantiations(); 1129 1130 // Restore the set of pending implicit instantiations. 1131 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1132 } 1133} 1134 1135void 1136Sema::InstantiateMemInitializers(CXXConstructorDecl *New, 1137 const CXXConstructorDecl *Tmpl, 1138 const MultiLevelTemplateArgumentList &TemplateArgs) { 1139 1140 llvm::SmallVector<MemInitTy*, 4> NewInits; 1141 1142 // Instantiate all the initializers. 1143 for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(), 1144 InitsEnd = Tmpl->init_end(); 1145 Inits != InitsEnd; ++Inits) { 1146 CXXBaseOrMemberInitializer *Init = *Inits; 1147 1148 ASTOwningVector<&ActionBase::DeleteExpr> NewArgs(*this); 1149 1150 // Instantiate all the arguments. 1151 for (ExprIterator Args = Init->arg_begin(), ArgsEnd = Init->arg_end(); 1152 Args != ArgsEnd; ++Args) { 1153 OwningExprResult NewArg = SubstExpr(*Args, TemplateArgs); 1154 1155 if (NewArg.isInvalid()) 1156 New->setInvalidDecl(); 1157 else 1158 NewArgs.push_back(NewArg.takeAs<Expr>()); 1159 } 1160 1161 MemInitResult NewInit; 1162 1163 if (Init->isBaseInitializer()) { 1164 QualType BaseType(Init->getBaseClass(), 0); 1165 BaseType = SubstType(BaseType, TemplateArgs, Init->getSourceLocation(), 1166 New->getDeclName()); 1167 1168 NewInit = BuildBaseInitializer(BaseType, 1169 (Expr **)NewArgs.data(), 1170 NewArgs.size(), 1171 Init->getSourceLocation(), 1172 Init->getRParenLoc(), 1173 New->getParent()); 1174 } else if (Init->isMemberInitializer()) { 1175 FieldDecl *Member; 1176 1177 // Is this an anonymous union? 1178 if (FieldDecl *UnionInit = Init->getAnonUnionMember()) 1179 Member = cast<FieldDecl>(FindInstantiatedDecl(UnionInit)); 1180 else 1181 Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMember())); 1182 1183 NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(), 1184 NewArgs.size(), 1185 Init->getSourceLocation(), 1186 Init->getRParenLoc()); 1187 } 1188 1189 if (NewInit.isInvalid()) 1190 New->setInvalidDecl(); 1191 else { 1192 // FIXME: It would be nice if ASTOwningVector had a release function. 1193 NewArgs.take(); 1194 1195 NewInits.push_back((MemInitTy *)NewInit.get()); 1196 } 1197 } 1198 1199 // Assign all the initializers to the new constructor. 1200 ActOnMemInitializers(DeclPtrTy::make(New), 1201 /*FIXME: ColonLoc */ 1202 SourceLocation(), 1203 NewInits.data(), NewInits.size()); 1204} 1205 1206// TODO: this could be templated if the various decl types used the 1207// same method name. 1208static bool isInstantiationOf(ClassTemplateDecl *Pattern, 1209 ClassTemplateDecl *Instance) { 1210 Pattern = Pattern->getCanonicalDecl(); 1211 1212 do { 1213 Instance = Instance->getCanonicalDecl(); 1214 if (Pattern == Instance) return true; 1215 Instance = Instance->getInstantiatedFromMemberTemplate(); 1216 } while (Instance); 1217 1218 return false; 1219} 1220 1221static bool isInstantiationOf(CXXRecordDecl *Pattern, 1222 CXXRecordDecl *Instance) { 1223 Pattern = Pattern->getCanonicalDecl(); 1224 1225 do { 1226 Instance = Instance->getCanonicalDecl(); 1227 if (Pattern == Instance) return true; 1228 Instance = Instance->getInstantiatedFromMemberClass(); 1229 } while (Instance); 1230 1231 return false; 1232} 1233 1234static bool isInstantiationOf(FunctionDecl *Pattern, 1235 FunctionDecl *Instance) { 1236 Pattern = Pattern->getCanonicalDecl(); 1237 1238 do { 1239 Instance = Instance->getCanonicalDecl(); 1240 if (Pattern == Instance) return true; 1241 Instance = Instance->getInstantiatedFromMemberFunction(); 1242 } while (Instance); 1243 1244 return false; 1245} 1246 1247static bool isInstantiationOf(EnumDecl *Pattern, 1248 EnumDecl *Instance) { 1249 Pattern = Pattern->getCanonicalDecl(); 1250 1251 do { 1252 Instance = Instance->getCanonicalDecl(); 1253 if (Pattern == Instance) return true; 1254 Instance = Instance->getInstantiatedFromMemberEnum(); 1255 } while (Instance); 1256 1257 return false; 1258} 1259 1260static bool isInstantiationOf(UnresolvedUsingDecl *Pattern, 1261 UsingDecl *Instance, 1262 ASTContext &C) { 1263 return C.getInstantiatedFromUnresolvedUsingDecl(Instance) == Pattern; 1264} 1265 1266static bool isInstantiationOfStaticDataMember(VarDecl *Pattern, 1267 VarDecl *Instance) { 1268 assert(Instance->isStaticDataMember()); 1269 1270 Pattern = Pattern->getCanonicalDecl(); 1271 1272 do { 1273 Instance = Instance->getCanonicalDecl(); 1274 if (Pattern == Instance) return true; 1275 Instance = Instance->getInstantiatedFromStaticDataMember(); 1276 } while (Instance); 1277 1278 return false; 1279} 1280 1281static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) { 1282 if (D->getKind() != Other->getKind()) { 1283 if (UnresolvedUsingDecl *UUD = dyn_cast<UnresolvedUsingDecl>(D)) { 1284 if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) { 1285 return isInstantiationOf(UUD, UD, Ctx); 1286 } 1287 } 1288 1289 return false; 1290 } 1291 1292 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other)) 1293 return isInstantiationOf(cast<CXXRecordDecl>(D), Record); 1294 1295 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other)) 1296 return isInstantiationOf(cast<FunctionDecl>(D), Function); 1297 1298 if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other)) 1299 return isInstantiationOf(cast<EnumDecl>(D), Enum); 1300 1301 if (VarDecl *Var = dyn_cast<VarDecl>(Other)) 1302 if (Var->isStaticDataMember()) 1303 return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var); 1304 1305 if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other)) 1306 return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp); 1307 1308 if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) { 1309 if (!Field->getDeclName()) { 1310 // This is an unnamed field. 1311 return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) == 1312 cast<FieldDecl>(D); 1313 } 1314 } 1315 1316 return D->getDeclName() && isa<NamedDecl>(Other) && 1317 D->getDeclName() == cast<NamedDecl>(Other)->getDeclName(); 1318} 1319 1320template<typename ForwardIterator> 1321static NamedDecl *findInstantiationOf(ASTContext &Ctx, 1322 NamedDecl *D, 1323 ForwardIterator first, 1324 ForwardIterator last) { 1325 for (; first != last; ++first) 1326 if (isInstantiationOf(Ctx, D, *first)) 1327 return cast<NamedDecl>(*first); 1328 1329 return 0; 1330} 1331 1332/// \brief Finds the instantiation of the given declaration context 1333/// within the current instantiation. 1334/// 1335/// \returns NULL if there was an error 1336DeclContext *Sema::FindInstantiatedContext(DeclContext* DC) { 1337 if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) { 1338 Decl* ID = FindInstantiatedDecl(D); 1339 return cast_or_null<DeclContext>(ID); 1340 } else return DC; 1341} 1342 1343/// \brief Find the instantiation of the given declaration within the 1344/// current instantiation. 1345/// 1346/// This routine is intended to be used when \p D is a declaration 1347/// referenced from within a template, that needs to mapped into the 1348/// corresponding declaration within an instantiation. For example, 1349/// given: 1350/// 1351/// \code 1352/// template<typename T> 1353/// struct X { 1354/// enum Kind { 1355/// KnownValue = sizeof(T) 1356/// }; 1357/// 1358/// bool getKind() const { return KnownValue; } 1359/// }; 1360/// 1361/// template struct X<int>; 1362/// \endcode 1363/// 1364/// In the instantiation of X<int>::getKind(), we need to map the 1365/// EnumConstantDecl for KnownValue (which refers to 1366/// X<T>::<Kind>::KnownValue) to its instantiation 1367/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs 1368/// this mapping from within the instantiation of X<int>. 1369NamedDecl *Sema::FindInstantiatedDecl(NamedDecl *D) { 1370 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) { 1371 // Transform all of the elements of the overloaded function set. 1372 OverloadedFunctionDecl *Result 1373 = OverloadedFunctionDecl::Create(Context, CurContext, Ovl->getDeclName()); 1374 1375 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 1376 FEnd = Ovl->function_end(); 1377 F != FEnd; ++F) { 1378 Result->addOverload( 1379 AnyFunctionDecl::getFromNamedDecl(FindInstantiatedDecl(*F))); 1380 } 1381 1382 return Result; 1383 } 1384 1385 DeclContext *ParentDC = D->getDeclContext(); 1386 if (isa<ParmVarDecl>(D) || ParentDC->isFunctionOrMethod()) { 1387 // D is a local of some kind. Look into the map of local 1388 // declarations to their instantiations. 1389 return cast<NamedDecl>(CurrentInstantiationScope->getInstantiationOf(D)); 1390 } 1391 1392 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) 1393 if (ClassTemplateDecl *ClassTemplate 1394 = Record->getDescribedClassTemplate()) { 1395 // When the declaration D was parsed, it referred to the current 1396 // instantiation. Therefore, look through the current context, 1397 // which contains actual instantiations, to find the 1398 // instantiation of the "current instantiation" that D refers 1399 // to. Alternatively, we could just instantiate the 1400 // injected-class-name with the current template arguments, but 1401 // such an instantiation is far more expensive. 1402 for (DeclContext *DC = CurContext; !DC->isFileContext(); 1403 DC = DC->getParent()) { 1404 if (ClassTemplateSpecializationDecl *Spec 1405 = dyn_cast<ClassTemplateSpecializationDecl>(DC)) 1406 if (isInstantiationOf(ClassTemplate, Spec->getSpecializedTemplate())) 1407 return Spec; 1408 } 1409 1410 assert(false && 1411 "Unable to find declaration for the current instantiation"); 1412 } 1413 1414 ParentDC = FindInstantiatedContext(ParentDC); 1415 if (!ParentDC) 1416 return 0; 1417 1418 if (ParentDC != D->getDeclContext()) { 1419 // We performed some kind of instantiation in the parent context, 1420 // so now we need to look into the instantiated parent context to 1421 // find the instantiation of the declaration D. 1422 NamedDecl *Result = 0; 1423 if (D->getDeclName()) { 1424 DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName()); 1425 Result = findInstantiationOf(Context, D, Found.first, Found.second); 1426 } else { 1427 // Since we don't have a name for the entity we're looking for, 1428 // our only option is to walk through all of the declarations to 1429 // find that name. This will occur in a few cases: 1430 // 1431 // - anonymous struct/union within a template 1432 // - unnamed class/struct/union/enum within a template 1433 // 1434 // FIXME: Find a better way to find these instantiations! 1435 Result = findInstantiationOf(Context, D, 1436 ParentDC->decls_begin(), 1437 ParentDC->decls_end()); 1438 } 1439 1440 assert(Result && "Unable to find instantiation of declaration!"); 1441 D = Result; 1442 } 1443 1444 return D; 1445} 1446 1447/// \brief Performs template instantiation for all implicit template 1448/// instantiations we have seen until this point. 1449void Sema::PerformPendingImplicitInstantiations() { 1450 while (!PendingImplicitInstantiations.empty()) { 1451 PendingImplicitInstantiation Inst = PendingImplicitInstantiations.front(); 1452 PendingImplicitInstantiations.pop_front(); 1453 1454 // Instantiate function definitions 1455 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) { 1456 PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Function), 1457 Function->getLocation(), *this, 1458 Context.getSourceManager(), 1459 "instantiating function definition"); 1460 1461 if (!Function->getBody()) 1462 InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true); 1463 continue; 1464 } 1465 1466 // Instantiate static data member definitions. 1467 VarDecl *Var = cast<VarDecl>(Inst.first); 1468 assert(Var->isStaticDataMember() && "Not a static data member?"); 1469 1470 PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Var), 1471 Var->getLocation(), *this, 1472 Context.getSourceManager(), 1473 "instantiating static data member " 1474 "definition"); 1475 1476 InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true); 1477 } 1478} 1479