Decl.cpp revision d330e23f183cedb9e6c1cbb809407576f7bbab71
1//===--- Decl.cpp - Declaration AST Node Implementation -------------------===// 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// 10// This file implements the Decl subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/Decl.h" 15#include "clang/AST/DeclCXX.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/DeclTemplate.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/TypeLoc.h" 20#include "clang/AST/Stmt.h" 21#include "clang/AST/Expr.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/PrettyPrinter.h" 24#include "clang/AST/ASTMutationListener.h" 25#include "clang/Basic/Builtins.h" 26#include "clang/Basic/IdentifierTable.h" 27#include "clang/Basic/Specifiers.h" 28#include "clang/Basic/TargetInfo.h" 29#include "llvm/Support/ErrorHandling.h" 30 31using namespace clang; 32 33//===----------------------------------------------------------------------===// 34// NamedDecl Implementation 35//===----------------------------------------------------------------------===// 36 37static llvm::Optional<Visibility> getVisibilityOf(const Decl *D) { 38 // If this declaration has an explicit visibility attribute, use it. 39 if (const VisibilityAttr *A = D->getAttr<VisibilityAttr>()) { 40 switch (A->getVisibility()) { 41 case VisibilityAttr::Default: 42 return DefaultVisibility; 43 case VisibilityAttr::Hidden: 44 return HiddenVisibility; 45 case VisibilityAttr::Protected: 46 return ProtectedVisibility; 47 } 48 49 return DefaultVisibility; 50 } 51 52 // If we're on Mac OS X, an 'availability' for Mac OS X attribute 53 // implies visibility(default). 54 if (D->getASTContext().Target.getTriple().isOSDarwin()) { 55 for (specific_attr_iterator<AvailabilityAttr> 56 A = D->specific_attr_begin<AvailabilityAttr>(), 57 AEnd = D->specific_attr_end<AvailabilityAttr>(); 58 A != AEnd; ++A) 59 if ((*A)->getPlatform()->getName().equals("macosx")) 60 return DefaultVisibility; 61 } 62 63 return llvm::Optional<Visibility>(); 64} 65 66typedef NamedDecl::LinkageInfo LinkageInfo; 67typedef std::pair<Linkage,Visibility> LVPair; 68 69static LVPair merge(LVPair L, LVPair R) { 70 return LVPair(minLinkage(L.first, R.first), 71 minVisibility(L.second, R.second)); 72} 73 74static LVPair merge(LVPair L, LinkageInfo R) { 75 return LVPair(minLinkage(L.first, R.linkage()), 76 minVisibility(L.second, R.visibility())); 77} 78 79namespace { 80/// Flags controlling the computation of linkage and visibility. 81struct LVFlags { 82 bool ConsiderGlobalVisibility; 83 bool ConsiderVisibilityAttributes; 84 bool ConsiderTemplateParameterTypes; 85 86 LVFlags() : ConsiderGlobalVisibility(true), 87 ConsiderVisibilityAttributes(true), 88 ConsiderTemplateParameterTypes(true) { 89 } 90 91 /// \brief Returns a set of flags that is only useful for computing the 92 /// linkage, not the visibility, of a declaration. 93 static LVFlags CreateOnlyDeclLinkage() { 94 LVFlags F; 95 F.ConsiderGlobalVisibility = false; 96 F.ConsiderVisibilityAttributes = false; 97 F.ConsiderTemplateParameterTypes = false; 98 return F; 99 } 100 101 /// Returns a set of flags, otherwise based on these, which ignores 102 /// off all sources of visibility except template arguments. 103 LVFlags onlyTemplateVisibility() const { 104 LVFlags F = *this; 105 F.ConsiderGlobalVisibility = false; 106 F.ConsiderVisibilityAttributes = false; 107 F.ConsiderTemplateParameterTypes = false; 108 return F; 109 } 110}; 111} // end anonymous namespace 112 113/// \brief Get the most restrictive linkage for the types in the given 114/// template parameter list. 115static LVPair 116getLVForTemplateParameterList(const TemplateParameterList *Params) { 117 LVPair LV(ExternalLinkage, DefaultVisibility); 118 for (TemplateParameterList::const_iterator P = Params->begin(), 119 PEnd = Params->end(); 120 P != PEnd; ++P) { 121 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(*P)) { 122 if (NTTP->isExpandedParameterPack()) { 123 for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I) { 124 QualType T = NTTP->getExpansionType(I); 125 if (!T->isDependentType()) 126 LV = merge(LV, T->getLinkageAndVisibility()); 127 } 128 continue; 129 } 130 131 if (!NTTP->getType()->isDependentType()) { 132 LV = merge(LV, NTTP->getType()->getLinkageAndVisibility()); 133 continue; 134 } 135 } 136 137 if (TemplateTemplateParmDecl *TTP 138 = dyn_cast<TemplateTemplateParmDecl>(*P)) { 139 LV = merge(LV, getLVForTemplateParameterList(TTP->getTemplateParameters())); 140 } 141 } 142 143 return LV; 144} 145 146/// getLVForDecl - Get the linkage and visibility for the given declaration. 147static LinkageInfo getLVForDecl(const NamedDecl *D, LVFlags F); 148 149/// \brief Get the most restrictive linkage for the types and 150/// declarations in the given template argument list. 151static LVPair getLVForTemplateArgumentList(const TemplateArgument *Args, 152 unsigned NumArgs, 153 LVFlags &F) { 154 LVPair LV(ExternalLinkage, DefaultVisibility); 155 156 for (unsigned I = 0; I != NumArgs; ++I) { 157 switch (Args[I].getKind()) { 158 case TemplateArgument::Null: 159 case TemplateArgument::Integral: 160 case TemplateArgument::Expression: 161 break; 162 163 case TemplateArgument::Type: 164 LV = merge(LV, Args[I].getAsType()->getLinkageAndVisibility()); 165 break; 166 167 case TemplateArgument::Declaration: 168 // The decl can validly be null as the representation of nullptr 169 // arguments, valid only in C++0x. 170 if (Decl *D = Args[I].getAsDecl()) { 171 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 172 LV = merge(LV, getLVForDecl(ND, F)); 173 } 174 break; 175 176 case TemplateArgument::Template: 177 case TemplateArgument::TemplateExpansion: 178 if (TemplateDecl *Template 179 = Args[I].getAsTemplateOrTemplatePattern().getAsTemplateDecl()) 180 LV = merge(LV, getLVForDecl(Template, F)); 181 break; 182 183 case TemplateArgument::Pack: 184 LV = merge(LV, getLVForTemplateArgumentList(Args[I].pack_begin(), 185 Args[I].pack_size(), 186 F)); 187 break; 188 } 189 } 190 191 return LV; 192} 193 194static LVPair 195getLVForTemplateArgumentList(const TemplateArgumentList &TArgs, 196 LVFlags &F) { 197 return getLVForTemplateArgumentList(TArgs.data(), TArgs.size(), F); 198} 199 200static bool shouldConsiderTemplateLV(const FunctionDecl *fn, 201 const FunctionTemplateSpecializationInfo *spec) { 202 return !(spec->isExplicitSpecialization() && 203 fn->hasAttr<VisibilityAttr>()); 204} 205 206static bool shouldConsiderTemplateLV(const ClassTemplateSpecializationDecl *d) { 207 return !(d->isExplicitSpecialization() && d->hasAttr<VisibilityAttr>()); 208} 209 210static LinkageInfo getLVForNamespaceScopeDecl(const NamedDecl *D, LVFlags F) { 211 assert(D->getDeclContext()->getRedeclContext()->isFileContext() && 212 "Not a name having namespace scope"); 213 ASTContext &Context = D->getASTContext(); 214 215 // C++ [basic.link]p3: 216 // A name having namespace scope (3.3.6) has internal linkage if it 217 // is the name of 218 // - an object, reference, function or function template that is 219 // explicitly declared static; or, 220 // (This bullet corresponds to C99 6.2.2p3.) 221 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 222 // Explicitly declared static. 223 if (Var->getStorageClass() == SC_Static) 224 return LinkageInfo::internal(); 225 226 // - an object or reference that is explicitly declared const 227 // and neither explicitly declared extern nor previously 228 // declared to have external linkage; or 229 // (there is no equivalent in C99) 230 if (Context.getLangOptions().CPlusPlus && 231 Var->getType().isConstant(Context) && 232 Var->getStorageClass() != SC_Extern && 233 Var->getStorageClass() != SC_PrivateExtern) { 234 bool FoundExtern = false; 235 for (const VarDecl *PrevVar = Var->getPreviousDeclaration(); 236 PrevVar && !FoundExtern; 237 PrevVar = PrevVar->getPreviousDeclaration()) 238 if (isExternalLinkage(PrevVar->getLinkage())) 239 FoundExtern = true; 240 241 if (!FoundExtern) 242 return LinkageInfo::internal(); 243 } 244 if (Var->getStorageClass() == SC_None) { 245 const VarDecl *PrevVar = Var->getPreviousDeclaration(); 246 for (; PrevVar; PrevVar = PrevVar->getPreviousDeclaration()) 247 if (PrevVar->getStorageClass() == SC_PrivateExtern) 248 break; 249 if (PrevVar) 250 return PrevVar->getLinkageAndVisibility(); 251 } 252 } else if (isa<FunctionDecl>(D) || isa<FunctionTemplateDecl>(D)) { 253 // C++ [temp]p4: 254 // A non-member function template can have internal linkage; any 255 // other template name shall have external linkage. 256 const FunctionDecl *Function = 0; 257 if (const FunctionTemplateDecl *FunTmpl 258 = dyn_cast<FunctionTemplateDecl>(D)) 259 Function = FunTmpl->getTemplatedDecl(); 260 else 261 Function = cast<FunctionDecl>(D); 262 263 // Explicitly declared static. 264 if (Function->getStorageClass() == SC_Static) 265 return LinkageInfo(InternalLinkage, DefaultVisibility, false); 266 } else if (const FieldDecl *Field = dyn_cast<FieldDecl>(D)) { 267 // - a data member of an anonymous union. 268 if (cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion()) 269 return LinkageInfo::internal(); 270 } 271 272 if (D->isInAnonymousNamespace()) { 273 const VarDecl *Var = dyn_cast<VarDecl>(D); 274 const FunctionDecl *Func = dyn_cast<FunctionDecl>(D); 275 if ((!Var || !Var->isExternC()) && (!Func || !Func->isExternC())) 276 return LinkageInfo::uniqueExternal(); 277 } 278 279 // Set up the defaults. 280 281 // C99 6.2.2p5: 282 // If the declaration of an identifier for an object has file 283 // scope and no storage-class specifier, its linkage is 284 // external. 285 LinkageInfo LV; 286 287 if (F.ConsiderVisibilityAttributes) { 288 if (llvm::Optional<Visibility> Vis = D->getExplicitVisibility()) { 289 LV.setVisibility(*Vis, true); 290 F.ConsiderGlobalVisibility = false; 291 } else { 292 // If we're declared in a namespace with a visibility attribute, 293 // use that namespace's visibility, but don't call it explicit. 294 for (const DeclContext *DC = D->getDeclContext(); 295 !isa<TranslationUnitDecl>(DC); 296 DC = DC->getParent()) { 297 if (!isa<NamespaceDecl>(DC)) continue; 298 if (llvm::Optional<Visibility> Vis 299 = cast<NamespaceDecl>(DC)->getExplicitVisibility()) { 300 LV.setVisibility(*Vis, false); 301 F.ConsiderGlobalVisibility = false; 302 break; 303 } 304 } 305 } 306 } 307 308 // C++ [basic.link]p4: 309 310 // A name having namespace scope has external linkage if it is the 311 // name of 312 // 313 // - an object or reference, unless it has internal linkage; or 314 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 315 // GCC applies the following optimization to variables and static 316 // data members, but not to functions: 317 // 318 // Modify the variable's LV by the LV of its type unless this is 319 // C or extern "C". This follows from [basic.link]p9: 320 // A type without linkage shall not be used as the type of a 321 // variable or function with external linkage unless 322 // - the entity has C language linkage, or 323 // - the entity is declared within an unnamed namespace, or 324 // - the entity is not used or is defined in the same 325 // translation unit. 326 // and [basic.link]p10: 327 // ...the types specified by all declarations referring to a 328 // given variable or function shall be identical... 329 // C does not have an equivalent rule. 330 // 331 // Ignore this if we've got an explicit attribute; the user 332 // probably knows what they're doing. 333 // 334 // Note that we don't want to make the variable non-external 335 // because of this, but unique-external linkage suits us. 336 if (Context.getLangOptions().CPlusPlus && !Var->isExternC()) { 337 LVPair TypeLV = Var->getType()->getLinkageAndVisibility(); 338 if (TypeLV.first != ExternalLinkage) 339 return LinkageInfo::uniqueExternal(); 340 if (!LV.visibilityExplicit()) 341 LV.mergeVisibility(TypeLV.second); 342 } 343 344 if (Var->getStorageClass() == SC_PrivateExtern) 345 LV.setVisibility(HiddenVisibility, true); 346 347 if (!Context.getLangOptions().CPlusPlus && 348 (Var->getStorageClass() == SC_Extern || 349 Var->getStorageClass() == SC_PrivateExtern)) { 350 351 // C99 6.2.2p4: 352 // For an identifier declared with the storage-class specifier 353 // extern in a scope in which a prior declaration of that 354 // identifier is visible, if the prior declaration specifies 355 // internal or external linkage, the linkage of the identifier 356 // at the later declaration is the same as the linkage 357 // specified at the prior declaration. If no prior declaration 358 // is visible, or if the prior declaration specifies no 359 // linkage, then the identifier has external linkage. 360 if (const VarDecl *PrevVar = Var->getPreviousDeclaration()) { 361 LinkageInfo PrevLV = getLVForDecl(PrevVar, F); 362 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 363 LV.mergeVisibility(PrevLV); 364 } 365 } 366 367 // - a function, unless it has internal linkage; or 368 } else if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 369 // In theory, we can modify the function's LV by the LV of its 370 // type unless it has C linkage (see comment above about variables 371 // for justification). In practice, GCC doesn't do this, so it's 372 // just too painful to make work. 373 374 if (Function->getStorageClass() == SC_PrivateExtern) 375 LV.setVisibility(HiddenVisibility, true); 376 377 // C99 6.2.2p5: 378 // If the declaration of an identifier for a function has no 379 // storage-class specifier, its linkage is determined exactly 380 // as if it were declared with the storage-class specifier 381 // extern. 382 if (!Context.getLangOptions().CPlusPlus && 383 (Function->getStorageClass() == SC_Extern || 384 Function->getStorageClass() == SC_PrivateExtern || 385 Function->getStorageClass() == SC_None)) { 386 // C99 6.2.2p4: 387 // For an identifier declared with the storage-class specifier 388 // extern in a scope in which a prior declaration of that 389 // identifier is visible, if the prior declaration specifies 390 // internal or external linkage, the linkage of the identifier 391 // at the later declaration is the same as the linkage 392 // specified at the prior declaration. If no prior declaration 393 // is visible, or if the prior declaration specifies no 394 // linkage, then the identifier has external linkage. 395 if (const FunctionDecl *PrevFunc = Function->getPreviousDeclaration()) { 396 LinkageInfo PrevLV = getLVForDecl(PrevFunc, F); 397 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 398 LV.mergeVisibility(PrevLV); 399 } 400 } 401 402 // In C++, then if the type of the function uses a type with 403 // unique-external linkage, it's not legally usable from outside 404 // this translation unit. However, we should use the C linkage 405 // rules instead for extern "C" declarations. 406 if (Context.getLangOptions().CPlusPlus && !Function->isExternC() && 407 Function->getType()->getLinkage() == UniqueExternalLinkage) 408 return LinkageInfo::uniqueExternal(); 409 410 // Consider LV from the template and the template arguments unless 411 // this is an explicit specialization with a visibility attribute. 412 if (FunctionTemplateSpecializationInfo *specInfo 413 = Function->getTemplateSpecializationInfo()) { 414 if (shouldConsiderTemplateLV(Function, specInfo)) { 415 LV.merge(getLVForDecl(specInfo->getTemplate(), 416 F.onlyTemplateVisibility())); 417 const TemplateArgumentList &templateArgs = *specInfo->TemplateArguments; 418 LV.merge(getLVForTemplateArgumentList(templateArgs, F)); 419 } 420 } 421 422 // - a named class (Clause 9), or an unnamed class defined in a 423 // typedef declaration in which the class has the typedef name 424 // for linkage purposes (7.1.3); or 425 // - a named enumeration (7.2), or an unnamed enumeration 426 // defined in a typedef declaration in which the enumeration 427 // has the typedef name for linkage purposes (7.1.3); or 428 } else if (const TagDecl *Tag = dyn_cast<TagDecl>(D)) { 429 // Unnamed tags have no linkage. 430 if (!Tag->getDeclName() && !Tag->getTypedefNameForAnonDecl()) 431 return LinkageInfo::none(); 432 433 // If this is a class template specialization, consider the 434 // linkage of the template and template arguments. 435 if (const ClassTemplateSpecializationDecl *spec 436 = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) { 437 if (shouldConsiderTemplateLV(spec)) { 438 // From the template. 439 LV.merge(getLVForDecl(spec->getSpecializedTemplate(), 440 F.onlyTemplateVisibility())); 441 442 // The arguments at which the template was instantiated. 443 const TemplateArgumentList &TemplateArgs = spec->getTemplateArgs(); 444 LV.merge(getLVForTemplateArgumentList(TemplateArgs, F)); 445 } 446 } 447 448 // Consider -fvisibility unless the type has C linkage. 449 if (F.ConsiderGlobalVisibility) 450 F.ConsiderGlobalVisibility = 451 (Context.getLangOptions().CPlusPlus && 452 !Tag->getDeclContext()->isExternCContext()); 453 454 // - an enumerator belonging to an enumeration with external linkage; 455 } else if (isa<EnumConstantDecl>(D)) { 456 LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()), F); 457 if (!isExternalLinkage(EnumLV.linkage())) 458 return LinkageInfo::none(); 459 LV.merge(EnumLV); 460 461 // - a template, unless it is a function template that has 462 // internal linkage (Clause 14); 463 } else if (const TemplateDecl *temp = dyn_cast<TemplateDecl>(D)) { 464 if (F.ConsiderTemplateParameterTypes) 465 LV.merge(getLVForTemplateParameterList(temp->getTemplateParameters())); 466 467 // - a namespace (7.3), unless it is declared within an unnamed 468 // namespace. 469 } else if (isa<NamespaceDecl>(D) && !D->isInAnonymousNamespace()) { 470 return LV; 471 472 // By extension, we assign external linkage to Objective-C 473 // interfaces. 474 } else if (isa<ObjCInterfaceDecl>(D)) { 475 // fallout 476 477 // Everything not covered here has no linkage. 478 } else { 479 return LinkageInfo::none(); 480 } 481 482 // If we ended up with non-external linkage, visibility should 483 // always be default. 484 if (LV.linkage() != ExternalLinkage) 485 return LinkageInfo(LV.linkage(), DefaultVisibility, false); 486 487 // If we didn't end up with hidden visibility, consider attributes 488 // and -fvisibility. 489 if (F.ConsiderGlobalVisibility) 490 LV.mergeVisibility(Context.getLangOptions().getVisibilityMode()); 491 492 return LV; 493} 494 495static LinkageInfo getLVForClassMember(const NamedDecl *D, LVFlags F) { 496 // Only certain class members have linkage. Note that fields don't 497 // really have linkage, but it's convenient to say they do for the 498 // purposes of calculating linkage of pointer-to-data-member 499 // template arguments. 500 if (!(isa<CXXMethodDecl>(D) || 501 isa<VarDecl>(D) || 502 isa<FieldDecl>(D) || 503 (isa<TagDecl>(D) && 504 (D->getDeclName() || cast<TagDecl>(D)->getTypedefNameForAnonDecl())))) 505 return LinkageInfo::none(); 506 507 LinkageInfo LV; 508 509 // The flags we're going to use to compute the class's visibility. 510 LVFlags ClassF = F; 511 512 // If we have an explicit visibility attribute, merge that in. 513 if (F.ConsiderVisibilityAttributes) { 514 if (llvm::Optional<Visibility> Vis = D->getExplicitVisibility()) { 515 LV.mergeVisibility(*Vis, true); 516 517 // Ignore global visibility later, but not this attribute. 518 F.ConsiderGlobalVisibility = false; 519 520 // Ignore both global visibility and attributes when computing our 521 // parent's visibility. 522 ClassF = F.onlyTemplateVisibility(); 523 } 524 } 525 526 // Class members only have linkage if their class has external 527 // linkage. 528 LV.merge(getLVForDecl(cast<RecordDecl>(D->getDeclContext()), ClassF)); 529 if (!isExternalLinkage(LV.linkage())) 530 return LinkageInfo::none(); 531 532 // If the class already has unique-external linkage, we can't improve. 533 if (LV.linkage() == UniqueExternalLinkage) 534 return LinkageInfo::uniqueExternal(); 535 536 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 537 // If the type of the function uses a type with unique-external 538 // linkage, it's not legally usable from outside this translation unit. 539 if (MD->getType()->getLinkage() == UniqueExternalLinkage) 540 return LinkageInfo::uniqueExternal(); 541 542 TemplateSpecializationKind TSK = TSK_Undeclared; 543 544 // If this is a method template specialization, use the linkage for 545 // the template parameters and arguments. 546 if (FunctionTemplateSpecializationInfo *spec 547 = MD->getTemplateSpecializationInfo()) { 548 if (shouldConsiderTemplateLV(MD, spec)) { 549 LV.merge(getLVForTemplateArgumentList(*spec->TemplateArguments, F)); 550 if (F.ConsiderTemplateParameterTypes) 551 LV.merge(getLVForTemplateParameterList( 552 spec->getTemplate()->getTemplateParameters())); 553 } 554 555 TSK = spec->getTemplateSpecializationKind(); 556 } else if (MemberSpecializationInfo *MSI = 557 MD->getMemberSpecializationInfo()) { 558 TSK = MSI->getTemplateSpecializationKind(); 559 } 560 561 // If we're paying attention to global visibility, apply 562 // -finline-visibility-hidden if this is an inline method. 563 // 564 // Note that ConsiderGlobalVisibility doesn't yet have information 565 // about whether containing classes have visibility attributes, 566 // and that's intentional. 567 if (TSK != TSK_ExplicitInstantiationDeclaration && 568 F.ConsiderGlobalVisibility && 569 MD->getASTContext().getLangOptions().InlineVisibilityHidden) { 570 // InlineVisibilityHidden only applies to definitions, and 571 // isInlined() only gives meaningful answers on definitions 572 // anyway. 573 const FunctionDecl *Def = 0; 574 if (MD->hasBody(Def) && Def->isInlined()) 575 LV.setVisibility(HiddenVisibility); 576 } 577 578 // Note that in contrast to basically every other situation, we 579 // *do* apply -fvisibility to method declarations. 580 581 } else if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) { 582 if (const ClassTemplateSpecializationDecl *spec 583 = dyn_cast<ClassTemplateSpecializationDecl>(RD)) { 584 if (shouldConsiderTemplateLV(spec)) { 585 // Merge template argument/parameter information for member 586 // class template specializations. 587 LV.merge(getLVForTemplateArgumentList(spec->getTemplateArgs(), F)); 588 if (F.ConsiderTemplateParameterTypes) 589 LV.merge(getLVForTemplateParameterList( 590 spec->getSpecializedTemplate()->getTemplateParameters())); 591 } 592 } 593 594 // Static data members. 595 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 596 // Modify the variable's linkage by its type, but ignore the 597 // type's visibility unless it's a definition. 598 LVPair TypeLV = VD->getType()->getLinkageAndVisibility(); 599 if (TypeLV.first != ExternalLinkage) 600 LV.mergeLinkage(UniqueExternalLinkage); 601 if (!LV.visibilityExplicit()) 602 LV.mergeVisibility(TypeLV.second); 603 } 604 605 F.ConsiderGlobalVisibility &= !LV.visibilityExplicit(); 606 607 // Apply -fvisibility if desired. 608 if (F.ConsiderGlobalVisibility && LV.visibility() != HiddenVisibility) { 609 LV.mergeVisibility(D->getASTContext().getLangOptions().getVisibilityMode()); 610 } 611 612 return LV; 613} 614 615static void clearLinkageForClass(const CXXRecordDecl *record) { 616 for (CXXRecordDecl::decl_iterator 617 i = record->decls_begin(), e = record->decls_end(); i != e; ++i) { 618 Decl *child = *i; 619 if (isa<NamedDecl>(child)) 620 cast<NamedDecl>(child)->ClearLinkageCache(); 621 } 622} 623 624void NamedDecl::ClearLinkageCache() { 625 // Note that we can't skip clearing the linkage of children just 626 // because the parent doesn't have cached linkage: we don't cache 627 // when computing linkage for parent contexts. 628 629 HasCachedLinkage = 0; 630 631 // If we're changing the linkage of a class, we need to reset the 632 // linkage of child declarations, too. 633 if (const CXXRecordDecl *record = dyn_cast<CXXRecordDecl>(this)) 634 clearLinkageForClass(record); 635 636 if (ClassTemplateDecl *temp = 637 dyn_cast<ClassTemplateDecl>(const_cast<NamedDecl*>(this))) { 638 // Clear linkage for the template pattern. 639 CXXRecordDecl *record = temp->getTemplatedDecl(); 640 record->HasCachedLinkage = 0; 641 clearLinkageForClass(record); 642 643 // We need to clear linkage for specializations, too. 644 for (ClassTemplateDecl::spec_iterator 645 i = temp->spec_begin(), e = temp->spec_end(); i != e; ++i) 646 i->ClearLinkageCache(); 647 } 648 649 // Clear cached linkage for function template decls, too. 650 if (FunctionTemplateDecl *temp = 651 dyn_cast<FunctionTemplateDecl>(const_cast<NamedDecl*>(this))) { 652 temp->getTemplatedDecl()->ClearLinkageCache(); 653 for (FunctionTemplateDecl::spec_iterator 654 i = temp->spec_begin(), e = temp->spec_end(); i != e; ++i) 655 i->ClearLinkageCache(); 656 } 657 658} 659 660Linkage NamedDecl::getLinkage() const { 661 if (HasCachedLinkage) { 662 assert(Linkage(CachedLinkage) == 663 getLVForDecl(this, LVFlags::CreateOnlyDeclLinkage()).linkage()); 664 return Linkage(CachedLinkage); 665 } 666 667 CachedLinkage = getLVForDecl(this, 668 LVFlags::CreateOnlyDeclLinkage()).linkage(); 669 HasCachedLinkage = 1; 670 return Linkage(CachedLinkage); 671} 672 673LinkageInfo NamedDecl::getLinkageAndVisibility() const { 674 LinkageInfo LI = getLVForDecl(this, LVFlags()); 675 assert(!HasCachedLinkage || Linkage(CachedLinkage) == LI.linkage()); 676 HasCachedLinkage = 1; 677 CachedLinkage = LI.linkage(); 678 return LI; 679} 680 681llvm::Optional<Visibility> NamedDecl::getExplicitVisibility() const { 682 // Use the most recent declaration of a variable. 683 if (const VarDecl *var = dyn_cast<VarDecl>(this)) 684 return getVisibilityOf(var->getMostRecentDeclaration()); 685 686 // Use the most recent declaration of a function, and also handle 687 // function template specializations. 688 if (const FunctionDecl *fn = dyn_cast<FunctionDecl>(this)) { 689 if (llvm::Optional<Visibility> V 690 = getVisibilityOf(fn->getMostRecentDeclaration())) 691 return V; 692 693 // If the function is a specialization of a template with an 694 // explicit visibility attribute, use that. 695 if (FunctionTemplateSpecializationInfo *templateInfo 696 = fn->getTemplateSpecializationInfo()) 697 return getVisibilityOf(templateInfo->getTemplate()->getTemplatedDecl()); 698 699 return llvm::Optional<Visibility>(); 700 } 701 702 // Otherwise, just check the declaration itself first. 703 if (llvm::Optional<Visibility> V = getVisibilityOf(this)) 704 return V; 705 706 // If there wasn't explicit visibility there, and this is a 707 // specialization of a class template, check for visibility 708 // on the pattern. 709 if (const ClassTemplateSpecializationDecl *spec 710 = dyn_cast<ClassTemplateSpecializationDecl>(this)) 711 return getVisibilityOf(spec->getSpecializedTemplate()->getTemplatedDecl()); 712 713 return llvm::Optional<Visibility>(); 714} 715 716static LinkageInfo getLVForDecl(const NamedDecl *D, LVFlags Flags) { 717 // Objective-C: treat all Objective-C declarations as having external 718 // linkage. 719 switch (D->getKind()) { 720 default: 721 break; 722 case Decl::TemplateTemplateParm: // count these as external 723 case Decl::NonTypeTemplateParm: 724 case Decl::ObjCAtDefsField: 725 case Decl::ObjCCategory: 726 case Decl::ObjCCategoryImpl: 727 case Decl::ObjCCompatibleAlias: 728 case Decl::ObjCForwardProtocol: 729 case Decl::ObjCImplementation: 730 case Decl::ObjCMethod: 731 case Decl::ObjCProperty: 732 case Decl::ObjCPropertyImpl: 733 case Decl::ObjCProtocol: 734 return LinkageInfo::external(); 735 } 736 737 // Handle linkage for namespace-scope names. 738 if (D->getDeclContext()->getRedeclContext()->isFileContext()) 739 return getLVForNamespaceScopeDecl(D, Flags); 740 741 // C++ [basic.link]p5: 742 // In addition, a member function, static data member, a named 743 // class or enumeration of class scope, or an unnamed class or 744 // enumeration defined in a class-scope typedef declaration such 745 // that the class or enumeration has the typedef name for linkage 746 // purposes (7.1.3), has external linkage if the name of the class 747 // has external linkage. 748 if (D->getDeclContext()->isRecord()) 749 return getLVForClassMember(D, Flags); 750 751 // C++ [basic.link]p6: 752 // The name of a function declared in block scope and the name of 753 // an object declared by a block scope extern declaration have 754 // linkage. If there is a visible declaration of an entity with 755 // linkage having the same name and type, ignoring entities 756 // declared outside the innermost enclosing namespace scope, the 757 // block scope declaration declares that same entity and receives 758 // the linkage of the previous declaration. If there is more than 759 // one such matching entity, the program is ill-formed. Otherwise, 760 // if no matching entity is found, the block scope entity receives 761 // external linkage. 762 if (D->getLexicalDeclContext()->isFunctionOrMethod()) { 763 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 764 if (Function->isInAnonymousNamespace() && !Function->isExternC()) 765 return LinkageInfo::uniqueExternal(); 766 767 LinkageInfo LV; 768 if (Flags.ConsiderVisibilityAttributes) { 769 if (llvm::Optional<Visibility> Vis = Function->getExplicitVisibility()) 770 LV.setVisibility(*Vis); 771 } 772 773 if (const FunctionDecl *Prev = Function->getPreviousDeclaration()) { 774 LinkageInfo PrevLV = getLVForDecl(Prev, Flags); 775 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 776 LV.mergeVisibility(PrevLV); 777 } 778 779 return LV; 780 } 781 782 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) 783 if (Var->getStorageClass() == SC_Extern || 784 Var->getStorageClass() == SC_PrivateExtern) { 785 if (Var->isInAnonymousNamespace() && !Var->isExternC()) 786 return LinkageInfo::uniqueExternal(); 787 788 LinkageInfo LV; 789 if (Var->getStorageClass() == SC_PrivateExtern) 790 LV.setVisibility(HiddenVisibility); 791 else if (Flags.ConsiderVisibilityAttributes) { 792 if (llvm::Optional<Visibility> Vis = Var->getExplicitVisibility()) 793 LV.setVisibility(*Vis); 794 } 795 796 if (const VarDecl *Prev = Var->getPreviousDeclaration()) { 797 LinkageInfo PrevLV = getLVForDecl(Prev, Flags); 798 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 799 LV.mergeVisibility(PrevLV); 800 } 801 802 return LV; 803 } 804 } 805 806 // C++ [basic.link]p6: 807 // Names not covered by these rules have no linkage. 808 return LinkageInfo::none(); 809} 810 811std::string NamedDecl::getQualifiedNameAsString() const { 812 return getQualifiedNameAsString(getASTContext().getLangOptions()); 813} 814 815std::string NamedDecl::getQualifiedNameAsString(const PrintingPolicy &P) const { 816 const DeclContext *Ctx = getDeclContext(); 817 818 if (Ctx->isFunctionOrMethod()) 819 return getNameAsString(); 820 821 typedef SmallVector<const DeclContext *, 8> ContextsTy; 822 ContextsTy Contexts; 823 824 // Collect contexts. 825 while (Ctx && isa<NamedDecl>(Ctx)) { 826 Contexts.push_back(Ctx); 827 Ctx = Ctx->getParent(); 828 }; 829 830 std::string QualName; 831 llvm::raw_string_ostream OS(QualName); 832 833 for (ContextsTy::reverse_iterator I = Contexts.rbegin(), E = Contexts.rend(); 834 I != E; ++I) { 835 if (const ClassTemplateSpecializationDecl *Spec 836 = dyn_cast<ClassTemplateSpecializationDecl>(*I)) { 837 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 838 std::string TemplateArgsStr 839 = TemplateSpecializationType::PrintTemplateArgumentList( 840 TemplateArgs.data(), 841 TemplateArgs.size(), 842 P); 843 OS << Spec->getName() << TemplateArgsStr; 844 } else if (const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(*I)) { 845 if (ND->isAnonymousNamespace()) 846 OS << "<anonymous namespace>"; 847 else 848 OS << ND; 849 } else if (const RecordDecl *RD = dyn_cast<RecordDecl>(*I)) { 850 if (!RD->getIdentifier()) 851 OS << "<anonymous " << RD->getKindName() << '>'; 852 else 853 OS << RD; 854 } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) { 855 const FunctionProtoType *FT = 0; 856 if (FD->hasWrittenPrototype()) 857 FT = dyn_cast<FunctionProtoType>(FD->getType()->getAs<FunctionType>()); 858 859 OS << FD << '('; 860 if (FT) { 861 unsigned NumParams = FD->getNumParams(); 862 for (unsigned i = 0; i < NumParams; ++i) { 863 if (i) 864 OS << ", "; 865 std::string Param; 866 FD->getParamDecl(i)->getType().getAsStringInternal(Param, P); 867 OS << Param; 868 } 869 870 if (FT->isVariadic()) { 871 if (NumParams > 0) 872 OS << ", "; 873 OS << "..."; 874 } 875 } 876 OS << ')'; 877 } else { 878 OS << cast<NamedDecl>(*I); 879 } 880 OS << "::"; 881 } 882 883 if (getDeclName()) 884 OS << this; 885 else 886 OS << "<anonymous>"; 887 888 return OS.str(); 889} 890 891bool NamedDecl::declarationReplaces(NamedDecl *OldD) const { 892 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch"); 893 894 // UsingDirectiveDecl's are not really NamedDecl's, and all have same name. 895 // We want to keep it, unless it nominates same namespace. 896 if (getKind() == Decl::UsingDirective) { 897 return cast<UsingDirectiveDecl>(this)->getNominatedNamespace() 898 ->getOriginalNamespace() == 899 cast<UsingDirectiveDecl>(OldD)->getNominatedNamespace() 900 ->getOriginalNamespace(); 901 } 902 903 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) 904 // For function declarations, we keep track of redeclarations. 905 return FD->getPreviousDeclaration() == OldD; 906 907 // For function templates, the underlying function declarations are linked. 908 if (const FunctionTemplateDecl *FunctionTemplate 909 = dyn_cast<FunctionTemplateDecl>(this)) 910 if (const FunctionTemplateDecl *OldFunctionTemplate 911 = dyn_cast<FunctionTemplateDecl>(OldD)) 912 return FunctionTemplate->getTemplatedDecl() 913 ->declarationReplaces(OldFunctionTemplate->getTemplatedDecl()); 914 915 // For method declarations, we keep track of redeclarations. 916 if (isa<ObjCMethodDecl>(this)) 917 return false; 918 919 if (isa<ObjCInterfaceDecl>(this) && isa<ObjCCompatibleAliasDecl>(OldD)) 920 return true; 921 922 if (isa<UsingShadowDecl>(this) && isa<UsingShadowDecl>(OldD)) 923 return cast<UsingShadowDecl>(this)->getTargetDecl() == 924 cast<UsingShadowDecl>(OldD)->getTargetDecl(); 925 926 if (isa<UsingDecl>(this) && isa<UsingDecl>(OldD)) { 927 ASTContext &Context = getASTContext(); 928 return Context.getCanonicalNestedNameSpecifier( 929 cast<UsingDecl>(this)->getQualifier()) == 930 Context.getCanonicalNestedNameSpecifier( 931 cast<UsingDecl>(OldD)->getQualifier()); 932 } 933 934 // For non-function declarations, if the declarations are of the 935 // same kind then this must be a redeclaration, or semantic analysis 936 // would not have given us the new declaration. 937 return this->getKind() == OldD->getKind(); 938} 939 940bool NamedDecl::hasLinkage() const { 941 return getLinkage() != NoLinkage; 942} 943 944NamedDecl *NamedDecl::getUnderlyingDecl() { 945 NamedDecl *ND = this; 946 while (true) { 947 if (UsingShadowDecl *UD = dyn_cast<UsingShadowDecl>(ND)) 948 ND = UD->getTargetDecl(); 949 else if (ObjCCompatibleAliasDecl *AD 950 = dyn_cast<ObjCCompatibleAliasDecl>(ND)) 951 return AD->getClassInterface(); 952 else 953 return ND; 954 } 955} 956 957bool NamedDecl::isCXXInstanceMember() const { 958 assert(isCXXClassMember() && 959 "checking whether non-member is instance member"); 960 961 const NamedDecl *D = this; 962 if (isa<UsingShadowDecl>(D)) 963 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 964 965 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D)) 966 return true; 967 if (isa<CXXMethodDecl>(D)) 968 return cast<CXXMethodDecl>(D)->isInstance(); 969 if (isa<FunctionTemplateDecl>(D)) 970 return cast<CXXMethodDecl>(cast<FunctionTemplateDecl>(D) 971 ->getTemplatedDecl())->isInstance(); 972 return false; 973} 974 975//===----------------------------------------------------------------------===// 976// DeclaratorDecl Implementation 977//===----------------------------------------------------------------------===// 978 979template <typename DeclT> 980static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) { 981 if (decl->getNumTemplateParameterLists() > 0) 982 return decl->getTemplateParameterList(0)->getTemplateLoc(); 983 else 984 return decl->getInnerLocStart(); 985} 986 987SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const { 988 TypeSourceInfo *TSI = getTypeSourceInfo(); 989 if (TSI) return TSI->getTypeLoc().getBeginLoc(); 990 return SourceLocation(); 991} 992 993void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) { 994 if (QualifierLoc) { 995 // Make sure the extended decl info is allocated. 996 if (!hasExtInfo()) { 997 // Save (non-extended) type source info pointer. 998 TypeSourceInfo *savedTInfo = DeclInfo.get<TypeSourceInfo*>(); 999 // Allocate external info struct. 1000 DeclInfo = new (getASTContext()) ExtInfo; 1001 // Restore savedTInfo into (extended) decl info. 1002 getExtInfo()->TInfo = savedTInfo; 1003 } 1004 // Set qualifier info. 1005 getExtInfo()->QualifierLoc = QualifierLoc; 1006 } 1007 else { 1008 // Here Qualifier == 0, i.e., we are removing the qualifier (if any). 1009 if (hasExtInfo()) { 1010 if (getExtInfo()->NumTemplParamLists == 0) { 1011 // Save type source info pointer. 1012 TypeSourceInfo *savedTInfo = getExtInfo()->TInfo; 1013 // Deallocate the extended decl info. 1014 getASTContext().Deallocate(getExtInfo()); 1015 // Restore savedTInfo into (non-extended) decl info. 1016 DeclInfo = savedTInfo; 1017 } 1018 else 1019 getExtInfo()->QualifierLoc = QualifierLoc; 1020 } 1021 } 1022} 1023 1024void 1025DeclaratorDecl::setTemplateParameterListsInfo(ASTContext &Context, 1026 unsigned NumTPLists, 1027 TemplateParameterList **TPLists) { 1028 assert(NumTPLists > 0); 1029 // Make sure the extended decl info is allocated. 1030 if (!hasExtInfo()) { 1031 // Save (non-extended) type source info pointer. 1032 TypeSourceInfo *savedTInfo = DeclInfo.get<TypeSourceInfo*>(); 1033 // Allocate external info struct. 1034 DeclInfo = new (getASTContext()) ExtInfo; 1035 // Restore savedTInfo into (extended) decl info. 1036 getExtInfo()->TInfo = savedTInfo; 1037 } 1038 // Set the template parameter lists info. 1039 getExtInfo()->setTemplateParameterListsInfo(Context, NumTPLists, TPLists); 1040} 1041 1042SourceLocation DeclaratorDecl::getOuterLocStart() const { 1043 return getTemplateOrInnerLocStart(this); 1044} 1045 1046namespace { 1047 1048// Helper function: returns true if QT is or contains a type 1049// having a postfix component. 1050bool typeIsPostfix(clang::QualType QT) { 1051 while (true) { 1052 const Type* T = QT.getTypePtr(); 1053 switch (T->getTypeClass()) { 1054 default: 1055 return false; 1056 case Type::Pointer: 1057 QT = cast<PointerType>(T)->getPointeeType(); 1058 break; 1059 case Type::BlockPointer: 1060 QT = cast<BlockPointerType>(T)->getPointeeType(); 1061 break; 1062 case Type::MemberPointer: 1063 QT = cast<MemberPointerType>(T)->getPointeeType(); 1064 break; 1065 case Type::LValueReference: 1066 case Type::RValueReference: 1067 QT = cast<ReferenceType>(T)->getPointeeType(); 1068 break; 1069 case Type::PackExpansion: 1070 QT = cast<PackExpansionType>(T)->getPattern(); 1071 break; 1072 case Type::Paren: 1073 case Type::ConstantArray: 1074 case Type::DependentSizedArray: 1075 case Type::IncompleteArray: 1076 case Type::VariableArray: 1077 case Type::FunctionProto: 1078 case Type::FunctionNoProto: 1079 return true; 1080 } 1081 } 1082} 1083 1084} // namespace 1085 1086SourceRange DeclaratorDecl::getSourceRange() const { 1087 SourceLocation RangeEnd = getLocation(); 1088 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) { 1089 if (typeIsPostfix(TInfo->getType())) 1090 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd(); 1091 } 1092 return SourceRange(getOuterLocStart(), RangeEnd); 1093} 1094 1095void 1096QualifierInfo::setTemplateParameterListsInfo(ASTContext &Context, 1097 unsigned NumTPLists, 1098 TemplateParameterList **TPLists) { 1099 assert((NumTPLists == 0 || TPLists != 0) && 1100 "Empty array of template parameters with positive size!"); 1101 1102 // Free previous template parameters (if any). 1103 if (NumTemplParamLists > 0) { 1104 Context.Deallocate(TemplParamLists); 1105 TemplParamLists = 0; 1106 NumTemplParamLists = 0; 1107 } 1108 // Set info on matched template parameter lists (if any). 1109 if (NumTPLists > 0) { 1110 TemplParamLists = new (Context) TemplateParameterList*[NumTPLists]; 1111 NumTemplParamLists = NumTPLists; 1112 for (unsigned i = NumTPLists; i-- > 0; ) 1113 TemplParamLists[i] = TPLists[i]; 1114 } 1115} 1116 1117//===----------------------------------------------------------------------===// 1118// VarDecl Implementation 1119//===----------------------------------------------------------------------===// 1120 1121const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) { 1122 switch (SC) { 1123 case SC_None: break; 1124 case SC_Auto: return "auto"; break; 1125 case SC_Extern: return "extern"; break; 1126 case SC_PrivateExtern: return "__private_extern__"; break; 1127 case SC_Register: return "register"; break; 1128 case SC_Static: return "static"; break; 1129 } 1130 1131 assert(0 && "Invalid storage class"); 1132 return 0; 1133} 1134 1135VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC, 1136 SourceLocation StartL, SourceLocation IdL, 1137 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, 1138 StorageClass S, StorageClass SCAsWritten) { 1139 return new (C) VarDecl(Var, DC, StartL, IdL, Id, T, TInfo, S, SCAsWritten); 1140} 1141 1142void VarDecl::setStorageClass(StorageClass SC) { 1143 assert(isLegalForVariable(SC)); 1144 if (getStorageClass() != SC) 1145 ClearLinkageCache(); 1146 1147 VarDeclBits.SClass = SC; 1148} 1149 1150SourceRange VarDecl::getSourceRange() const { 1151 if (getInit()) 1152 return SourceRange(getOuterLocStart(), getInit()->getLocEnd()); 1153 return DeclaratorDecl::getSourceRange(); 1154} 1155 1156bool VarDecl::isExternC() const { 1157 ASTContext &Context = getASTContext(); 1158 if (!Context.getLangOptions().CPlusPlus) 1159 return (getDeclContext()->isTranslationUnit() && 1160 getStorageClass() != SC_Static) || 1161 (getDeclContext()->isFunctionOrMethod() && hasExternalStorage()); 1162 1163 const DeclContext *DC = getDeclContext(); 1164 if (DC->isFunctionOrMethod()) 1165 return false; 1166 1167 for (; !DC->isTranslationUnit(); DC = DC->getParent()) { 1168 if (const LinkageSpecDecl *Linkage = dyn_cast<LinkageSpecDecl>(DC)) { 1169 if (Linkage->getLanguage() == LinkageSpecDecl::lang_c) 1170 return getStorageClass() != SC_Static; 1171 1172 break; 1173 } 1174 1175 } 1176 1177 return false; 1178} 1179 1180VarDecl *VarDecl::getCanonicalDecl() { 1181 return getFirstDeclaration(); 1182} 1183 1184VarDecl::DefinitionKind VarDecl::isThisDeclarationADefinition() const { 1185 // C++ [basic.def]p2: 1186 // A declaration is a definition unless [...] it contains the 'extern' 1187 // specifier or a linkage-specification and neither an initializer [...], 1188 // it declares a static data member in a class declaration [...]. 1189 // C++ [temp.expl.spec]p15: 1190 // An explicit specialization of a static data member of a template is a 1191 // definition if the declaration includes an initializer; otherwise, it is 1192 // a declaration. 1193 if (isStaticDataMember()) { 1194 if (isOutOfLine() && (hasInit() || 1195 getTemplateSpecializationKind() != TSK_ExplicitSpecialization)) 1196 return Definition; 1197 else 1198 return DeclarationOnly; 1199 } 1200 // C99 6.7p5: 1201 // A definition of an identifier is a declaration for that identifier that 1202 // [...] causes storage to be reserved for that object. 1203 // Note: that applies for all non-file-scope objects. 1204 // C99 6.9.2p1: 1205 // If the declaration of an identifier for an object has file scope and an 1206 // initializer, the declaration is an external definition for the identifier 1207 if (hasInit()) 1208 return Definition; 1209 // AST for 'extern "C" int foo;' is annotated with 'extern'. 1210 if (hasExternalStorage()) 1211 return DeclarationOnly; 1212 1213 if (getStorageClassAsWritten() == SC_Extern || 1214 getStorageClassAsWritten() == SC_PrivateExtern) { 1215 for (const VarDecl *PrevVar = getPreviousDeclaration(); 1216 PrevVar; PrevVar = PrevVar->getPreviousDeclaration()) { 1217 if (PrevVar->getLinkage() == InternalLinkage && PrevVar->hasInit()) 1218 return DeclarationOnly; 1219 } 1220 } 1221 // C99 6.9.2p2: 1222 // A declaration of an object that has file scope without an initializer, 1223 // and without a storage class specifier or the scs 'static', constitutes 1224 // a tentative definition. 1225 // No such thing in C++. 1226 if (!getASTContext().getLangOptions().CPlusPlus && isFileVarDecl()) 1227 return TentativeDefinition; 1228 1229 // What's left is (in C, block-scope) declarations without initializers or 1230 // external storage. These are definitions. 1231 return Definition; 1232} 1233 1234VarDecl *VarDecl::getActingDefinition() { 1235 DefinitionKind Kind = isThisDeclarationADefinition(); 1236 if (Kind != TentativeDefinition) 1237 return 0; 1238 1239 VarDecl *LastTentative = 0; 1240 VarDecl *First = getFirstDeclaration(); 1241 for (redecl_iterator I = First->redecls_begin(), E = First->redecls_end(); 1242 I != E; ++I) { 1243 Kind = (*I)->isThisDeclarationADefinition(); 1244 if (Kind == Definition) 1245 return 0; 1246 else if (Kind == TentativeDefinition) 1247 LastTentative = *I; 1248 } 1249 return LastTentative; 1250} 1251 1252bool VarDecl::isTentativeDefinitionNow() const { 1253 DefinitionKind Kind = isThisDeclarationADefinition(); 1254 if (Kind != TentativeDefinition) 1255 return false; 1256 1257 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1258 if ((*I)->isThisDeclarationADefinition() == Definition) 1259 return false; 1260 } 1261 return true; 1262} 1263 1264VarDecl *VarDecl::getDefinition() { 1265 VarDecl *First = getFirstDeclaration(); 1266 for (redecl_iterator I = First->redecls_begin(), E = First->redecls_end(); 1267 I != E; ++I) { 1268 if ((*I)->isThisDeclarationADefinition() == Definition) 1269 return *I; 1270 } 1271 return 0; 1272} 1273 1274VarDecl::DefinitionKind VarDecl::hasDefinition() const { 1275 DefinitionKind Kind = DeclarationOnly; 1276 1277 const VarDecl *First = getFirstDeclaration(); 1278 for (redecl_iterator I = First->redecls_begin(), E = First->redecls_end(); 1279 I != E; ++I) 1280 Kind = std::max(Kind, (*I)->isThisDeclarationADefinition()); 1281 1282 return Kind; 1283} 1284 1285const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const { 1286 redecl_iterator I = redecls_begin(), E = redecls_end(); 1287 while (I != E && !I->getInit()) 1288 ++I; 1289 1290 if (I != E) { 1291 D = *I; 1292 return I->getInit(); 1293 } 1294 return 0; 1295} 1296 1297bool VarDecl::isOutOfLine() const { 1298 if (Decl::isOutOfLine()) 1299 return true; 1300 1301 if (!isStaticDataMember()) 1302 return false; 1303 1304 // If this static data member was instantiated from a static data member of 1305 // a class template, check whether that static data member was defined 1306 // out-of-line. 1307 if (VarDecl *VD = getInstantiatedFromStaticDataMember()) 1308 return VD->isOutOfLine(); 1309 1310 return false; 1311} 1312 1313VarDecl *VarDecl::getOutOfLineDefinition() { 1314 if (!isStaticDataMember()) 1315 return 0; 1316 1317 for (VarDecl::redecl_iterator RD = redecls_begin(), RDEnd = redecls_end(); 1318 RD != RDEnd; ++RD) { 1319 if (RD->getLexicalDeclContext()->isFileContext()) 1320 return *RD; 1321 } 1322 1323 return 0; 1324} 1325 1326void VarDecl::setInit(Expr *I) { 1327 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>()) { 1328 Eval->~EvaluatedStmt(); 1329 getASTContext().Deallocate(Eval); 1330 } 1331 1332 Init = I; 1333} 1334 1335bool VarDecl::extendsLifetimeOfTemporary() const { 1336 assert(getType()->isReferenceType() &&"Non-references never extend lifetime"); 1337 1338 const Expr *E = getInit(); 1339 if (!E) 1340 return false; 1341 1342 if (const ExprWithCleanups *Cleanups = dyn_cast<ExprWithCleanups>(E)) 1343 E = Cleanups->getSubExpr(); 1344 1345 return isa<MaterializeTemporaryExpr>(E); 1346} 1347 1348VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const { 1349 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) 1350 return cast<VarDecl>(MSI->getInstantiatedFrom()); 1351 1352 return 0; 1353} 1354 1355TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const { 1356 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) 1357 return MSI->getTemplateSpecializationKind(); 1358 1359 return TSK_Undeclared; 1360} 1361 1362MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const { 1363 return getASTContext().getInstantiatedFromStaticDataMember(this); 1364} 1365 1366void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK, 1367 SourceLocation PointOfInstantiation) { 1368 MemberSpecializationInfo *MSI = getMemberSpecializationInfo(); 1369 assert(MSI && "Not an instantiated static data member?"); 1370 MSI->setTemplateSpecializationKind(TSK); 1371 if (TSK != TSK_ExplicitSpecialization && 1372 PointOfInstantiation.isValid() && 1373 MSI->getPointOfInstantiation().isInvalid()) 1374 MSI->setPointOfInstantiation(PointOfInstantiation); 1375} 1376 1377//===----------------------------------------------------------------------===// 1378// ParmVarDecl Implementation 1379//===----------------------------------------------------------------------===// 1380 1381ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC, 1382 SourceLocation StartLoc, 1383 SourceLocation IdLoc, IdentifierInfo *Id, 1384 QualType T, TypeSourceInfo *TInfo, 1385 StorageClass S, StorageClass SCAsWritten, 1386 Expr *DefArg) { 1387 return new (C) ParmVarDecl(ParmVar, DC, StartLoc, IdLoc, Id, T, TInfo, 1388 S, SCAsWritten, DefArg); 1389} 1390 1391SourceRange ParmVarDecl::getSourceRange() const { 1392 if (!hasInheritedDefaultArg()) { 1393 SourceRange ArgRange = getDefaultArgRange(); 1394 if (ArgRange.isValid()) 1395 return SourceRange(getOuterLocStart(), ArgRange.getEnd()); 1396 } 1397 1398 return DeclaratorDecl::getSourceRange(); 1399} 1400 1401Expr *ParmVarDecl::getDefaultArg() { 1402 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!"); 1403 assert(!hasUninstantiatedDefaultArg() && 1404 "Default argument is not yet instantiated!"); 1405 1406 Expr *Arg = getInit(); 1407 if (ExprWithCleanups *E = dyn_cast_or_null<ExprWithCleanups>(Arg)) 1408 return E->getSubExpr(); 1409 1410 return Arg; 1411} 1412 1413unsigned ParmVarDecl::getNumDefaultArgTemporaries() const { 1414 if (const ExprWithCleanups *E = dyn_cast<ExprWithCleanups>(getInit())) 1415 return E->getNumTemporaries(); 1416 1417 return 0; 1418} 1419 1420CXXTemporary *ParmVarDecl::getDefaultArgTemporary(unsigned i) { 1421 assert(getNumDefaultArgTemporaries() && 1422 "Default arguments does not have any temporaries!"); 1423 1424 ExprWithCleanups *E = cast<ExprWithCleanups>(getInit()); 1425 return E->getTemporary(i); 1426} 1427 1428SourceRange ParmVarDecl::getDefaultArgRange() const { 1429 if (const Expr *E = getInit()) 1430 return E->getSourceRange(); 1431 1432 if (hasUninstantiatedDefaultArg()) 1433 return getUninstantiatedDefaultArg()->getSourceRange(); 1434 1435 return SourceRange(); 1436} 1437 1438bool ParmVarDecl::isParameterPack() const { 1439 return isa<PackExpansionType>(getType()); 1440} 1441 1442//===----------------------------------------------------------------------===// 1443// FunctionDecl Implementation 1444//===----------------------------------------------------------------------===// 1445 1446void FunctionDecl::getNameForDiagnostic(std::string &S, 1447 const PrintingPolicy &Policy, 1448 bool Qualified) const { 1449 NamedDecl::getNameForDiagnostic(S, Policy, Qualified); 1450 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs(); 1451 if (TemplateArgs) 1452 S += TemplateSpecializationType::PrintTemplateArgumentList( 1453 TemplateArgs->data(), 1454 TemplateArgs->size(), 1455 Policy); 1456 1457} 1458 1459bool FunctionDecl::isVariadic() const { 1460 if (const FunctionProtoType *FT = getType()->getAs<FunctionProtoType>()) 1461 return FT->isVariadic(); 1462 return false; 1463} 1464 1465bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const { 1466 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1467 if (I->Body || I->IsLateTemplateParsed) { 1468 Definition = *I; 1469 return true; 1470 } 1471 } 1472 1473 return false; 1474} 1475 1476bool FunctionDecl::hasTrivialBody() const 1477{ 1478 Stmt *S = getBody(); 1479 if (!S) { 1480 // Since we don't have a body for this function, we don't know if it's 1481 // trivial or not. 1482 return false; 1483 } 1484 1485 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty()) 1486 return true; 1487 return false; 1488} 1489 1490bool FunctionDecl::isDefined(const FunctionDecl *&Definition) const { 1491 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1492 if (I->IsDeleted || I->IsDefaulted || I->Body || I->IsLateTemplateParsed) { 1493 Definition = I->IsDeleted ? I->getCanonicalDecl() : *I; 1494 return true; 1495 } 1496 } 1497 1498 return false; 1499} 1500 1501Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const { 1502 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1503 if (I->Body) { 1504 Definition = *I; 1505 return I->Body.get(getASTContext().getExternalSource()); 1506 } else if (I->IsLateTemplateParsed) { 1507 Definition = *I; 1508 return 0; 1509 } 1510 } 1511 1512 return 0; 1513} 1514 1515void FunctionDecl::setBody(Stmt *B) { 1516 Body = B; 1517 if (B) 1518 EndRangeLoc = B->getLocEnd(); 1519} 1520 1521void FunctionDecl::setPure(bool P) { 1522 IsPure = P; 1523 if (P) 1524 if (CXXRecordDecl *Parent = dyn_cast<CXXRecordDecl>(getDeclContext())) 1525 Parent->markedVirtualFunctionPure(); 1526} 1527 1528bool FunctionDecl::isMain() const { 1529 const TranslationUnitDecl *tunit = 1530 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext()); 1531 return tunit && 1532 !tunit->getASTContext().getLangOptions().Freestanding && 1533 getIdentifier() && 1534 getIdentifier()->isStr("main"); 1535} 1536 1537bool FunctionDecl::isReservedGlobalPlacementOperator() const { 1538 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName); 1539 assert(getDeclName().getCXXOverloadedOperator() == OO_New || 1540 getDeclName().getCXXOverloadedOperator() == OO_Delete || 1541 getDeclName().getCXXOverloadedOperator() == OO_Array_New || 1542 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete); 1543 1544 if (isa<CXXRecordDecl>(getDeclContext())) return false; 1545 assert(getDeclContext()->getRedeclContext()->isTranslationUnit()); 1546 1547 const FunctionProtoType *proto = getType()->castAs<FunctionProtoType>(); 1548 if (proto->getNumArgs() != 2 || proto->isVariadic()) return false; 1549 1550 ASTContext &Context = 1551 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext()) 1552 ->getASTContext(); 1553 1554 // The result type and first argument type are constant across all 1555 // these operators. The second argument must be exactly void*. 1556 return (proto->getArgType(1).getCanonicalType() == Context.VoidPtrTy); 1557} 1558 1559bool FunctionDecl::isExternC() const { 1560 ASTContext &Context = getASTContext(); 1561 // In C, any non-static, non-overloadable function has external 1562 // linkage. 1563 if (!Context.getLangOptions().CPlusPlus) 1564 return getStorageClass() != SC_Static && !getAttr<OverloadableAttr>(); 1565 1566 const DeclContext *DC = getDeclContext(); 1567 if (DC->isRecord()) 1568 return false; 1569 1570 for (; !DC->isTranslationUnit(); DC = DC->getParent()) { 1571 if (const LinkageSpecDecl *Linkage = dyn_cast<LinkageSpecDecl>(DC)) { 1572 if (Linkage->getLanguage() == LinkageSpecDecl::lang_c) 1573 return getStorageClass() != SC_Static && 1574 !getAttr<OverloadableAttr>(); 1575 1576 break; 1577 } 1578 } 1579 1580 return isMain(); 1581} 1582 1583bool FunctionDecl::isGlobal() const { 1584 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(this)) 1585 return Method->isStatic(); 1586 1587 if (getStorageClass() == SC_Static) 1588 return false; 1589 1590 for (const DeclContext *DC = getDeclContext(); 1591 DC->isNamespace(); 1592 DC = DC->getParent()) { 1593 if (const NamespaceDecl *Namespace = cast<NamespaceDecl>(DC)) { 1594 if (!Namespace->getDeclName()) 1595 return false; 1596 break; 1597 } 1598 } 1599 1600 return true; 1601} 1602 1603void 1604FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) { 1605 redeclarable_base::setPreviousDeclaration(PrevDecl); 1606 1607 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) { 1608 FunctionTemplateDecl *PrevFunTmpl 1609 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : 0; 1610 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch"); 1611 FunTmpl->setPreviousDeclaration(PrevFunTmpl); 1612 } 1613 1614 if (PrevDecl->IsInline) 1615 IsInline = true; 1616} 1617 1618const FunctionDecl *FunctionDecl::getCanonicalDecl() const { 1619 return getFirstDeclaration(); 1620} 1621 1622FunctionDecl *FunctionDecl::getCanonicalDecl() { 1623 return getFirstDeclaration(); 1624} 1625 1626void FunctionDecl::setStorageClass(StorageClass SC) { 1627 assert(isLegalForFunction(SC)); 1628 if (getStorageClass() != SC) 1629 ClearLinkageCache(); 1630 1631 SClass = SC; 1632} 1633 1634/// \brief Returns a value indicating whether this function 1635/// corresponds to a builtin function. 1636/// 1637/// The function corresponds to a built-in function if it is 1638/// declared at translation scope or within an extern "C" block and 1639/// its name matches with the name of a builtin. The returned value 1640/// will be 0 for functions that do not correspond to a builtin, a 1641/// value of type \c Builtin::ID if in the target-independent range 1642/// \c [1,Builtin::First), or a target-specific builtin value. 1643unsigned FunctionDecl::getBuiltinID() const { 1644 ASTContext &Context = getASTContext(); 1645 if (!getIdentifier() || !getIdentifier()->getBuiltinID()) 1646 return 0; 1647 1648 unsigned BuiltinID = getIdentifier()->getBuiltinID(); 1649 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) 1650 return BuiltinID; 1651 1652 // This function has the name of a known C library 1653 // function. Determine whether it actually refers to the C library 1654 // function or whether it just has the same name. 1655 1656 // If this is a static function, it's not a builtin. 1657 if (getStorageClass() == SC_Static) 1658 return 0; 1659 1660 // If this function is at translation-unit scope and we're not in 1661 // C++, it refers to the C library function. 1662 if (!Context.getLangOptions().CPlusPlus && 1663 getDeclContext()->isTranslationUnit()) 1664 return BuiltinID; 1665 1666 // If the function is in an extern "C" linkage specification and is 1667 // not marked "overloadable", it's the real function. 1668 if (isa<LinkageSpecDecl>(getDeclContext()) && 1669 cast<LinkageSpecDecl>(getDeclContext())->getLanguage() 1670 == LinkageSpecDecl::lang_c && 1671 !getAttr<OverloadableAttr>()) 1672 return BuiltinID; 1673 1674 // Not a builtin 1675 return 0; 1676} 1677 1678 1679/// getNumParams - Return the number of parameters this function must have 1680/// based on its FunctionType. This is the length of the ParamInfo array 1681/// after it has been created. 1682unsigned FunctionDecl::getNumParams() const { 1683 const FunctionType *FT = getType()->getAs<FunctionType>(); 1684 if (isa<FunctionNoProtoType>(FT)) 1685 return 0; 1686 return cast<FunctionProtoType>(FT)->getNumArgs(); 1687 1688} 1689 1690void FunctionDecl::setParams(ASTContext &C, 1691 ParmVarDecl **NewParamInfo, unsigned NumParams) { 1692 assert(ParamInfo == 0 && "Already has param info!"); 1693 assert(NumParams == getNumParams() && "Parameter count mismatch!"); 1694 1695 // Zero params -> null pointer. 1696 if (NumParams) { 1697 void *Mem = C.Allocate(sizeof(ParmVarDecl*)*NumParams); 1698 ParamInfo = new (Mem) ParmVarDecl*[NumParams]; 1699 memcpy(ParamInfo, NewParamInfo, sizeof(ParmVarDecl*)*NumParams); 1700 } 1701} 1702 1703/// getMinRequiredArguments - Returns the minimum number of arguments 1704/// needed to call this function. This may be fewer than the number of 1705/// function parameters, if some of the parameters have default 1706/// arguments (in C++) or the last parameter is a parameter pack. 1707unsigned FunctionDecl::getMinRequiredArguments() const { 1708 if (!getASTContext().getLangOptions().CPlusPlus) 1709 return getNumParams(); 1710 1711 unsigned NumRequiredArgs = getNumParams(); 1712 1713 // If the last parameter is a parameter pack, we don't need an argument for 1714 // it. 1715 if (NumRequiredArgs > 0 && 1716 getParamDecl(NumRequiredArgs - 1)->isParameterPack()) 1717 --NumRequiredArgs; 1718 1719 // If this parameter has a default argument, we don't need an argument for 1720 // it. 1721 while (NumRequiredArgs > 0 && 1722 getParamDecl(NumRequiredArgs-1)->hasDefaultArg()) 1723 --NumRequiredArgs; 1724 1725 // We might have parameter packs before the end. These can't be deduced, 1726 // but they can still handle multiple arguments. 1727 unsigned ArgIdx = NumRequiredArgs; 1728 while (ArgIdx > 0) { 1729 if (getParamDecl(ArgIdx - 1)->isParameterPack()) 1730 NumRequiredArgs = ArgIdx; 1731 1732 --ArgIdx; 1733 } 1734 1735 return NumRequiredArgs; 1736} 1737 1738bool FunctionDecl::isInlined() const { 1739 if (IsInline) 1740 return true; 1741 1742 if (isa<CXXMethodDecl>(this)) { 1743 if (!isOutOfLine() || getCanonicalDecl()->isInlineSpecified()) 1744 return true; 1745 } 1746 1747 switch (getTemplateSpecializationKind()) { 1748 case TSK_Undeclared: 1749 case TSK_ExplicitSpecialization: 1750 return false; 1751 1752 case TSK_ImplicitInstantiation: 1753 case TSK_ExplicitInstantiationDeclaration: 1754 case TSK_ExplicitInstantiationDefinition: 1755 // Handle below. 1756 break; 1757 } 1758 1759 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern(); 1760 bool HasPattern = false; 1761 if (PatternDecl) 1762 HasPattern = PatternDecl->hasBody(PatternDecl); 1763 1764 if (HasPattern && PatternDecl) 1765 return PatternDecl->isInlined(); 1766 1767 return false; 1768} 1769 1770/// \brief For a function declaration in C or C++, determine whether this 1771/// declaration causes the definition to be externally visible. 1772/// 1773/// Determines whether this is the first non-inline redeclaration of an inline 1774/// function in a language where "inline" does not normally require an 1775/// externally visible definition. 1776bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const { 1777 assert(!doesThisDeclarationHaveABody() && 1778 "Must have a declaration without a body."); 1779 1780 ASTContext &Context = getASTContext(); 1781 1782 // In C99 mode, a function may have an inline definition (causing it to 1783 // be deferred) then redeclared later. As a special case, "extern inline" 1784 // is not required to produce an external symbol. 1785 if (Context.getLangOptions().GNUInline || !Context.getLangOptions().C99 || 1786 Context.getLangOptions().CPlusPlus) 1787 return false; 1788 if (getLinkage() != ExternalLinkage || isInlineSpecified()) 1789 return false; 1790 const FunctionDecl *Definition = 0; 1791 if (hasBody(Definition)) 1792 return Definition->isInlined() && 1793 Definition->isInlineDefinitionExternallyVisible(); 1794 return false; 1795} 1796 1797/// \brief For an inline function definition in C or C++, determine whether the 1798/// definition will be externally visible. 1799/// 1800/// Inline function definitions are always available for inlining optimizations. 1801/// However, depending on the language dialect, declaration specifiers, and 1802/// attributes, the definition of an inline function may or may not be 1803/// "externally" visible to other translation units in the program. 1804/// 1805/// In C99, inline definitions are not externally visible by default. However, 1806/// if even one of the global-scope declarations is marked "extern inline", the 1807/// inline definition becomes externally visible (C99 6.7.4p6). 1808/// 1809/// In GNU89 mode, or if the gnu_inline attribute is attached to the function 1810/// definition, we use the GNU semantics for inline, which are nearly the 1811/// opposite of C99 semantics. In particular, "inline" by itself will create 1812/// an externally visible symbol, but "extern inline" will not create an 1813/// externally visible symbol. 1814bool FunctionDecl::isInlineDefinitionExternallyVisible() const { 1815 assert(doesThisDeclarationHaveABody() && "Must have the function definition"); 1816 assert(isInlined() && "Function must be inline"); 1817 ASTContext &Context = getASTContext(); 1818 1819 if (Context.getLangOptions().GNUInline || hasAttr<GNUInlineAttr>()) { 1820 // If it's not the case that both 'inline' and 'extern' are 1821 // specified on the definition, then this inline definition is 1822 // externally visible. 1823 if (!(isInlineSpecified() && getStorageClassAsWritten() == SC_Extern)) 1824 return true; 1825 1826 // If any declaration is 'inline' but not 'extern', then this definition 1827 // is externally visible. 1828 for (redecl_iterator Redecl = redecls_begin(), RedeclEnd = redecls_end(); 1829 Redecl != RedeclEnd; 1830 ++Redecl) { 1831 if (Redecl->isInlineSpecified() && 1832 Redecl->getStorageClassAsWritten() != SC_Extern) 1833 return true; 1834 } 1835 1836 return false; 1837 } 1838 1839 // C99 6.7.4p6: 1840 // [...] If all of the file scope declarations for a function in a 1841 // translation unit include the inline function specifier without extern, 1842 // then the definition in that translation unit is an inline definition. 1843 for (redecl_iterator Redecl = redecls_begin(), RedeclEnd = redecls_end(); 1844 Redecl != RedeclEnd; 1845 ++Redecl) { 1846 // Only consider file-scope declarations in this test. 1847 if (!Redecl->getLexicalDeclContext()->isTranslationUnit()) 1848 continue; 1849 1850 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern) 1851 return true; // Not an inline definition 1852 } 1853 1854 // C99 6.7.4p6: 1855 // An inline definition does not provide an external definition for the 1856 // function, and does not forbid an external definition in another 1857 // translation unit. 1858 return false; 1859} 1860 1861/// getOverloadedOperator - Which C++ overloaded operator this 1862/// function represents, if any. 1863OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const { 1864 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName) 1865 return getDeclName().getCXXOverloadedOperator(); 1866 else 1867 return OO_None; 1868} 1869 1870/// getLiteralIdentifier - The literal suffix identifier this function 1871/// represents, if any. 1872const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const { 1873 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName) 1874 return getDeclName().getCXXLiteralIdentifier(); 1875 else 1876 return 0; 1877} 1878 1879FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const { 1880 if (TemplateOrSpecialization.isNull()) 1881 return TK_NonTemplate; 1882 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>()) 1883 return TK_FunctionTemplate; 1884 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>()) 1885 return TK_MemberSpecialization; 1886 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>()) 1887 return TK_FunctionTemplateSpecialization; 1888 if (TemplateOrSpecialization.is 1889 <DependentFunctionTemplateSpecializationInfo*>()) 1890 return TK_DependentFunctionTemplateSpecialization; 1891 1892 assert(false && "Did we miss a TemplateOrSpecialization type?"); 1893 return TK_NonTemplate; 1894} 1895 1896FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const { 1897 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo()) 1898 return cast<FunctionDecl>(Info->getInstantiatedFrom()); 1899 1900 return 0; 1901} 1902 1903MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const { 1904 return TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>(); 1905} 1906 1907void 1908FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C, 1909 FunctionDecl *FD, 1910 TemplateSpecializationKind TSK) { 1911 assert(TemplateOrSpecialization.isNull() && 1912 "Member function is already a specialization"); 1913 MemberSpecializationInfo *Info 1914 = new (C) MemberSpecializationInfo(FD, TSK); 1915 TemplateOrSpecialization = Info; 1916} 1917 1918bool FunctionDecl::isImplicitlyInstantiable() const { 1919 // If the function is invalid, it can't be implicitly instantiated. 1920 if (isInvalidDecl()) 1921 return false; 1922 1923 switch (getTemplateSpecializationKind()) { 1924 case TSK_Undeclared: 1925 case TSK_ExplicitSpecialization: 1926 case TSK_ExplicitInstantiationDefinition: 1927 return false; 1928 1929 case TSK_ImplicitInstantiation: 1930 return true; 1931 1932 case TSK_ExplicitInstantiationDeclaration: 1933 // Handled below. 1934 break; 1935 } 1936 1937 // Find the actual template from which we will instantiate. 1938 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern(); 1939 bool HasPattern = false; 1940 if (PatternDecl) 1941 HasPattern = PatternDecl->hasBody(PatternDecl); 1942 1943 // C++0x [temp.explicit]p9: 1944 // Except for inline functions, other explicit instantiation declarations 1945 // have the effect of suppressing the implicit instantiation of the entity 1946 // to which they refer. 1947 if (!HasPattern || !PatternDecl) 1948 return true; 1949 1950 return PatternDecl->isInlined(); 1951} 1952 1953FunctionDecl *FunctionDecl::getTemplateInstantiationPattern() const { 1954 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) { 1955 while (Primary->getInstantiatedFromMemberTemplate()) { 1956 // If we have hit a point where the user provided a specialization of 1957 // this template, we're done looking. 1958 if (Primary->isMemberSpecialization()) 1959 break; 1960 1961 Primary = Primary->getInstantiatedFromMemberTemplate(); 1962 } 1963 1964 return Primary->getTemplatedDecl(); 1965 } 1966 1967 return getInstantiatedFromMemberFunction(); 1968} 1969 1970FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const { 1971 if (FunctionTemplateSpecializationInfo *Info 1972 = TemplateOrSpecialization 1973 .dyn_cast<FunctionTemplateSpecializationInfo*>()) { 1974 return Info->Template.getPointer(); 1975 } 1976 return 0; 1977} 1978 1979const TemplateArgumentList * 1980FunctionDecl::getTemplateSpecializationArgs() const { 1981 if (FunctionTemplateSpecializationInfo *Info 1982 = TemplateOrSpecialization 1983 .dyn_cast<FunctionTemplateSpecializationInfo*>()) { 1984 return Info->TemplateArguments; 1985 } 1986 return 0; 1987} 1988 1989const TemplateArgumentListInfo * 1990FunctionDecl::getTemplateSpecializationArgsAsWritten() const { 1991 if (FunctionTemplateSpecializationInfo *Info 1992 = TemplateOrSpecialization 1993 .dyn_cast<FunctionTemplateSpecializationInfo*>()) { 1994 return Info->TemplateArgumentsAsWritten; 1995 } 1996 return 0; 1997} 1998 1999void 2000FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C, 2001 FunctionTemplateDecl *Template, 2002 const TemplateArgumentList *TemplateArgs, 2003 void *InsertPos, 2004 TemplateSpecializationKind TSK, 2005 const TemplateArgumentListInfo *TemplateArgsAsWritten, 2006 SourceLocation PointOfInstantiation) { 2007 assert(TSK != TSK_Undeclared && 2008 "Must specify the type of function template specialization"); 2009 FunctionTemplateSpecializationInfo *Info 2010 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>(); 2011 if (!Info) 2012 Info = FunctionTemplateSpecializationInfo::Create(C, this, Template, TSK, 2013 TemplateArgs, 2014 TemplateArgsAsWritten, 2015 PointOfInstantiation); 2016 TemplateOrSpecialization = Info; 2017 2018 // Insert this function template specialization into the set of known 2019 // function template specializations. 2020 if (InsertPos) 2021 Template->addSpecialization(Info, InsertPos); 2022 else { 2023 // Try to insert the new node. If there is an existing node, leave it, the 2024 // set will contain the canonical decls while 2025 // FunctionTemplateDecl::findSpecialization will return 2026 // the most recent redeclarations. 2027 FunctionTemplateSpecializationInfo *Existing 2028 = Template->getSpecializations().GetOrInsertNode(Info); 2029 (void)Existing; 2030 assert((!Existing || Existing->Function->isCanonicalDecl()) && 2031 "Set is supposed to only contain canonical decls"); 2032 } 2033} 2034 2035void 2036FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context, 2037 const UnresolvedSetImpl &Templates, 2038 const TemplateArgumentListInfo &TemplateArgs) { 2039 assert(TemplateOrSpecialization.isNull()); 2040 size_t Size = sizeof(DependentFunctionTemplateSpecializationInfo); 2041 Size += Templates.size() * sizeof(FunctionTemplateDecl*); 2042 Size += TemplateArgs.size() * sizeof(TemplateArgumentLoc); 2043 void *Buffer = Context.Allocate(Size); 2044 DependentFunctionTemplateSpecializationInfo *Info = 2045 new (Buffer) DependentFunctionTemplateSpecializationInfo(Templates, 2046 TemplateArgs); 2047 TemplateOrSpecialization = Info; 2048} 2049 2050DependentFunctionTemplateSpecializationInfo:: 2051DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts, 2052 const TemplateArgumentListInfo &TArgs) 2053 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) { 2054 2055 d.NumTemplates = Ts.size(); 2056 d.NumArgs = TArgs.size(); 2057 2058 FunctionTemplateDecl **TsArray = 2059 const_cast<FunctionTemplateDecl**>(getTemplates()); 2060 for (unsigned I = 0, E = Ts.size(); I != E; ++I) 2061 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl()); 2062 2063 TemplateArgumentLoc *ArgsArray = 2064 const_cast<TemplateArgumentLoc*>(getTemplateArgs()); 2065 for (unsigned I = 0, E = TArgs.size(); I != E; ++I) 2066 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]); 2067} 2068 2069TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const { 2070 // For a function template specialization, query the specialization 2071 // information object. 2072 FunctionTemplateSpecializationInfo *FTSInfo 2073 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>(); 2074 if (FTSInfo) 2075 return FTSInfo->getTemplateSpecializationKind(); 2076 2077 MemberSpecializationInfo *MSInfo 2078 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>(); 2079 if (MSInfo) 2080 return MSInfo->getTemplateSpecializationKind(); 2081 2082 return TSK_Undeclared; 2083} 2084 2085void 2086FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK, 2087 SourceLocation PointOfInstantiation) { 2088 if (FunctionTemplateSpecializationInfo *FTSInfo 2089 = TemplateOrSpecialization.dyn_cast< 2090 FunctionTemplateSpecializationInfo*>()) { 2091 FTSInfo->setTemplateSpecializationKind(TSK); 2092 if (TSK != TSK_ExplicitSpecialization && 2093 PointOfInstantiation.isValid() && 2094 FTSInfo->getPointOfInstantiation().isInvalid()) 2095 FTSInfo->setPointOfInstantiation(PointOfInstantiation); 2096 } else if (MemberSpecializationInfo *MSInfo 2097 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) { 2098 MSInfo->setTemplateSpecializationKind(TSK); 2099 if (TSK != TSK_ExplicitSpecialization && 2100 PointOfInstantiation.isValid() && 2101 MSInfo->getPointOfInstantiation().isInvalid()) 2102 MSInfo->setPointOfInstantiation(PointOfInstantiation); 2103 } else 2104 assert(false && "Function cannot have a template specialization kind"); 2105} 2106 2107SourceLocation FunctionDecl::getPointOfInstantiation() const { 2108 if (FunctionTemplateSpecializationInfo *FTSInfo 2109 = TemplateOrSpecialization.dyn_cast< 2110 FunctionTemplateSpecializationInfo*>()) 2111 return FTSInfo->getPointOfInstantiation(); 2112 else if (MemberSpecializationInfo *MSInfo 2113 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) 2114 return MSInfo->getPointOfInstantiation(); 2115 2116 return SourceLocation(); 2117} 2118 2119bool FunctionDecl::isOutOfLine() const { 2120 if (Decl::isOutOfLine()) 2121 return true; 2122 2123 // If this function was instantiated from a member function of a 2124 // class template, check whether that member function was defined out-of-line. 2125 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) { 2126 const FunctionDecl *Definition; 2127 if (FD->hasBody(Definition)) 2128 return Definition->isOutOfLine(); 2129 } 2130 2131 // If this function was instantiated from a function template, 2132 // check whether that function template was defined out-of-line. 2133 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) { 2134 const FunctionDecl *Definition; 2135 if (FunTmpl->getTemplatedDecl()->hasBody(Definition)) 2136 return Definition->isOutOfLine(); 2137 } 2138 2139 return false; 2140} 2141 2142SourceRange FunctionDecl::getSourceRange() const { 2143 return SourceRange(getOuterLocStart(), EndRangeLoc); 2144} 2145 2146//===----------------------------------------------------------------------===// 2147// FieldDecl Implementation 2148//===----------------------------------------------------------------------===// 2149 2150FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC, 2151 SourceLocation StartLoc, SourceLocation IdLoc, 2152 IdentifierInfo *Id, QualType T, 2153 TypeSourceInfo *TInfo, Expr *BW, bool Mutable, 2154 bool HasInit) { 2155 return new (C) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo, 2156 BW, Mutable, HasInit); 2157} 2158 2159bool FieldDecl::isAnonymousStructOrUnion() const { 2160 if (!isImplicit() || getDeclName()) 2161 return false; 2162 2163 if (const RecordType *Record = getType()->getAs<RecordType>()) 2164 return Record->getDecl()->isAnonymousStructOrUnion(); 2165 2166 return false; 2167} 2168 2169unsigned FieldDecl::getFieldIndex() const { 2170 if (CachedFieldIndex) return CachedFieldIndex - 1; 2171 2172 unsigned index = 0; 2173 const RecordDecl *RD = getParent(); 2174 const FieldDecl *LastFD = 0; 2175 bool IsMsStruct = RD->hasAttr<MsStructAttr>(); 2176 2177 RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 2178 while (true) { 2179 assert(i != e && "failed to find field in parent!"); 2180 if (*i == this) 2181 break; 2182 2183 if (IsMsStruct) { 2184 // Zero-length bitfields following non-bitfield members are ignored. 2185 if (getASTContext().ZeroBitfieldFollowsNonBitfield((*i), LastFD)) { 2186 ++i; 2187 continue; 2188 } 2189 LastFD = (*i); 2190 } 2191 ++i; 2192 ++index; 2193 } 2194 2195 CachedFieldIndex = index + 1; 2196 return index; 2197} 2198 2199SourceRange FieldDecl::getSourceRange() const { 2200 if (const Expr *E = InitializerOrBitWidth.getPointer()) 2201 return SourceRange(getInnerLocStart(), E->getLocEnd()); 2202 return DeclaratorDecl::getSourceRange(); 2203} 2204 2205void FieldDecl::setInClassInitializer(Expr *Init) { 2206 assert(!InitializerOrBitWidth.getPointer() && 2207 "bit width or initializer already set"); 2208 InitializerOrBitWidth.setPointer(Init); 2209 InitializerOrBitWidth.setInt(0); 2210} 2211 2212//===----------------------------------------------------------------------===// 2213// TagDecl Implementation 2214//===----------------------------------------------------------------------===// 2215 2216SourceLocation TagDecl::getOuterLocStart() const { 2217 return getTemplateOrInnerLocStart(this); 2218} 2219 2220SourceRange TagDecl::getSourceRange() const { 2221 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation(); 2222 return SourceRange(getOuterLocStart(), E); 2223} 2224 2225TagDecl* TagDecl::getCanonicalDecl() { 2226 return getFirstDeclaration(); 2227} 2228 2229void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) { 2230 TypedefNameDeclOrQualifier = TDD; 2231 if (TypeForDecl) 2232 const_cast<Type*>(TypeForDecl)->ClearLinkageCache(); 2233 ClearLinkageCache(); 2234} 2235 2236void TagDecl::startDefinition() { 2237 IsBeingDefined = true; 2238 2239 if (isa<CXXRecordDecl>(this)) { 2240 CXXRecordDecl *D = cast<CXXRecordDecl>(this); 2241 struct CXXRecordDecl::DefinitionData *Data = 2242 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D); 2243 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) 2244 cast<CXXRecordDecl>(*I)->DefinitionData = Data; 2245 } 2246} 2247 2248void TagDecl::completeDefinition() { 2249 assert((!isa<CXXRecordDecl>(this) || 2250 cast<CXXRecordDecl>(this)->hasDefinition()) && 2251 "definition completed but not started"); 2252 2253 IsDefinition = true; 2254 IsBeingDefined = false; 2255 2256 if (ASTMutationListener *L = getASTMutationListener()) 2257 L->CompletedTagDefinition(this); 2258} 2259 2260TagDecl* TagDecl::getDefinition() const { 2261 if (isDefinition()) 2262 return const_cast<TagDecl *>(this); 2263 if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(this)) 2264 return CXXRD->getDefinition(); 2265 2266 for (redecl_iterator R = redecls_begin(), REnd = redecls_end(); 2267 R != REnd; ++R) 2268 if (R->isDefinition()) 2269 return *R; 2270 2271 return 0; 2272} 2273 2274void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) { 2275 if (QualifierLoc) { 2276 // Make sure the extended qualifier info is allocated. 2277 if (!hasExtInfo()) 2278 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo; 2279 // Set qualifier info. 2280 getExtInfo()->QualifierLoc = QualifierLoc; 2281 } 2282 else { 2283 // Here Qualifier == 0, i.e., we are removing the qualifier (if any). 2284 if (hasExtInfo()) { 2285 if (getExtInfo()->NumTemplParamLists == 0) { 2286 getASTContext().Deallocate(getExtInfo()); 2287 TypedefNameDeclOrQualifier = (TypedefNameDecl*) 0; 2288 } 2289 else 2290 getExtInfo()->QualifierLoc = QualifierLoc; 2291 } 2292 } 2293} 2294 2295void TagDecl::setTemplateParameterListsInfo(ASTContext &Context, 2296 unsigned NumTPLists, 2297 TemplateParameterList **TPLists) { 2298 assert(NumTPLists > 0); 2299 // Make sure the extended decl info is allocated. 2300 if (!hasExtInfo()) 2301 // Allocate external info struct. 2302 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo; 2303 // Set the template parameter lists info. 2304 getExtInfo()->setTemplateParameterListsInfo(Context, NumTPLists, TPLists); 2305} 2306 2307//===----------------------------------------------------------------------===// 2308// EnumDecl Implementation 2309//===----------------------------------------------------------------------===// 2310 2311EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC, 2312 SourceLocation StartLoc, SourceLocation IdLoc, 2313 IdentifierInfo *Id, 2314 EnumDecl *PrevDecl, bool IsScoped, 2315 bool IsScopedUsingClassTag, bool IsFixed) { 2316 EnumDecl *Enum = new (C) EnumDecl(DC, StartLoc, IdLoc, Id, PrevDecl, 2317 IsScoped, IsScopedUsingClassTag, IsFixed); 2318 C.getTypeDeclType(Enum, PrevDecl); 2319 return Enum; 2320} 2321 2322EnumDecl *EnumDecl::Create(ASTContext &C, EmptyShell Empty) { 2323 return new (C) EnumDecl(0, SourceLocation(), SourceLocation(), 0, 0, 2324 false, false, false); 2325} 2326 2327void EnumDecl::completeDefinition(QualType NewType, 2328 QualType NewPromotionType, 2329 unsigned NumPositiveBits, 2330 unsigned NumNegativeBits) { 2331 assert(!isDefinition() && "Cannot redefine enums!"); 2332 if (!IntegerType) 2333 IntegerType = NewType.getTypePtr(); 2334 PromotionType = NewPromotionType; 2335 setNumPositiveBits(NumPositiveBits); 2336 setNumNegativeBits(NumNegativeBits); 2337 TagDecl::completeDefinition(); 2338} 2339 2340//===----------------------------------------------------------------------===// 2341// RecordDecl Implementation 2342//===----------------------------------------------------------------------===// 2343 2344RecordDecl::RecordDecl(Kind DK, TagKind TK, DeclContext *DC, 2345 SourceLocation StartLoc, SourceLocation IdLoc, 2346 IdentifierInfo *Id, RecordDecl *PrevDecl) 2347 : TagDecl(DK, TK, DC, IdLoc, Id, PrevDecl, StartLoc) { 2348 HasFlexibleArrayMember = false; 2349 AnonymousStructOrUnion = false; 2350 HasObjectMember = false; 2351 LoadedFieldsFromExternalStorage = false; 2352 assert(classof(static_cast<Decl*>(this)) && "Invalid Kind!"); 2353} 2354 2355RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC, 2356 SourceLocation StartLoc, SourceLocation IdLoc, 2357 IdentifierInfo *Id, RecordDecl* PrevDecl) { 2358 RecordDecl* R = new (C) RecordDecl(Record, TK, DC, StartLoc, IdLoc, Id, 2359 PrevDecl); 2360 C.getTypeDeclType(R, PrevDecl); 2361 return R; 2362} 2363 2364RecordDecl *RecordDecl::Create(const ASTContext &C, EmptyShell Empty) { 2365 return new (C) RecordDecl(Record, TTK_Struct, 0, SourceLocation(), 2366 SourceLocation(), 0, 0); 2367} 2368 2369bool RecordDecl::isInjectedClassName() const { 2370 return isImplicit() && getDeclName() && getDeclContext()->isRecord() && 2371 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName(); 2372} 2373 2374RecordDecl::field_iterator RecordDecl::field_begin() const { 2375 if (hasExternalLexicalStorage() && !LoadedFieldsFromExternalStorage) 2376 LoadFieldsFromExternalStorage(); 2377 2378 return field_iterator(decl_iterator(FirstDecl)); 2379} 2380 2381/// completeDefinition - Notes that the definition of this type is now 2382/// complete. 2383void RecordDecl::completeDefinition() { 2384 assert(!isDefinition() && "Cannot redefine record!"); 2385 TagDecl::completeDefinition(); 2386} 2387 2388void RecordDecl::LoadFieldsFromExternalStorage() const { 2389 ExternalASTSource *Source = getASTContext().getExternalSource(); 2390 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 2391 2392 // Notify that we have a RecordDecl doing some initialization. 2393 ExternalASTSource::Deserializing TheFields(Source); 2394 2395 SmallVector<Decl*, 64> Decls; 2396 LoadedFieldsFromExternalStorage = true; 2397 switch (Source->FindExternalLexicalDeclsBy<FieldDecl>(this, Decls)) { 2398 case ELR_Success: 2399 break; 2400 2401 case ELR_AlreadyLoaded: 2402 case ELR_Failure: 2403 return; 2404 } 2405 2406#ifndef NDEBUG 2407 // Check that all decls we got were FieldDecls. 2408 for (unsigned i=0, e=Decls.size(); i != e; ++i) 2409 assert(isa<FieldDecl>(Decls[i])); 2410#endif 2411 2412 if (Decls.empty()) 2413 return; 2414 2415 llvm::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls); 2416} 2417 2418//===----------------------------------------------------------------------===// 2419// BlockDecl Implementation 2420//===----------------------------------------------------------------------===// 2421 2422void BlockDecl::setParams(ParmVarDecl **NewParamInfo, 2423 unsigned NParms) { 2424 assert(ParamInfo == 0 && "Already has param info!"); 2425 2426 // Zero params -> null pointer. 2427 if (NParms) { 2428 NumParams = NParms; 2429 void *Mem = getASTContext().Allocate(sizeof(ParmVarDecl*)*NumParams); 2430 ParamInfo = new (Mem) ParmVarDecl*[NumParams]; 2431 memcpy(ParamInfo, NewParamInfo, sizeof(ParmVarDecl*)*NumParams); 2432 } 2433} 2434 2435void BlockDecl::setCaptures(ASTContext &Context, 2436 const Capture *begin, 2437 const Capture *end, 2438 bool capturesCXXThis) { 2439 CapturesCXXThis = capturesCXXThis; 2440 2441 if (begin == end) { 2442 NumCaptures = 0; 2443 Captures = 0; 2444 return; 2445 } 2446 2447 NumCaptures = end - begin; 2448 2449 // Avoid new Capture[] because we don't want to provide a default 2450 // constructor. 2451 size_t allocationSize = NumCaptures * sizeof(Capture); 2452 void *buffer = Context.Allocate(allocationSize, /*alignment*/sizeof(void*)); 2453 memcpy(buffer, begin, allocationSize); 2454 Captures = static_cast<Capture*>(buffer); 2455} 2456 2457bool BlockDecl::capturesVariable(const VarDecl *variable) const { 2458 for (capture_const_iterator 2459 i = capture_begin(), e = capture_end(); i != e; ++i) 2460 // Only auto vars can be captured, so no redeclaration worries. 2461 if (i->getVariable() == variable) 2462 return true; 2463 2464 return false; 2465} 2466 2467SourceRange BlockDecl::getSourceRange() const { 2468 return SourceRange(getLocation(), Body? Body->getLocEnd() : getLocation()); 2469} 2470 2471//===----------------------------------------------------------------------===// 2472// Other Decl Allocation/Deallocation Method Implementations 2473//===----------------------------------------------------------------------===// 2474 2475TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) { 2476 return new (C) TranslationUnitDecl(C); 2477} 2478 2479LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC, 2480 SourceLocation IdentL, IdentifierInfo *II) { 2481 return new (C) LabelDecl(DC, IdentL, II, 0, IdentL); 2482} 2483 2484LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC, 2485 SourceLocation IdentL, IdentifierInfo *II, 2486 SourceLocation GnuLabelL) { 2487 assert(GnuLabelL != IdentL && "Use this only for GNU local labels"); 2488 return new (C) LabelDecl(DC, IdentL, II, 0, GnuLabelL); 2489} 2490 2491 2492NamespaceDecl *NamespaceDecl::Create(ASTContext &C, DeclContext *DC, 2493 SourceLocation StartLoc, 2494 SourceLocation IdLoc, IdentifierInfo *Id) { 2495 return new (C) NamespaceDecl(DC, StartLoc, IdLoc, Id); 2496} 2497 2498NamespaceDecl *NamespaceDecl::getNextNamespace() { 2499 return dyn_cast_or_null<NamespaceDecl>( 2500 NextNamespace.get(getASTContext().getExternalSource())); 2501} 2502 2503ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC, 2504 SourceLocation IdLoc, 2505 IdentifierInfo *Id, 2506 QualType Type) { 2507 return new (C) ImplicitParamDecl(DC, IdLoc, Id, Type); 2508} 2509 2510FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC, 2511 SourceLocation StartLoc, 2512 const DeclarationNameInfo &NameInfo, 2513 QualType T, TypeSourceInfo *TInfo, 2514 StorageClass SC, StorageClass SCAsWritten, 2515 bool isInlineSpecified, 2516 bool hasWrittenPrototype) { 2517 FunctionDecl *New = new (C) FunctionDecl(Function, DC, StartLoc, NameInfo, 2518 T, TInfo, SC, SCAsWritten, 2519 isInlineSpecified); 2520 New->HasWrittenPrototype = hasWrittenPrototype; 2521 return New; 2522} 2523 2524BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) { 2525 return new (C) BlockDecl(DC, L); 2526} 2527 2528EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD, 2529 SourceLocation L, 2530 IdentifierInfo *Id, QualType T, 2531 Expr *E, const llvm::APSInt &V) { 2532 return new (C) EnumConstantDecl(CD, L, Id, T, E, V); 2533} 2534 2535IndirectFieldDecl * 2536IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L, 2537 IdentifierInfo *Id, QualType T, NamedDecl **CH, 2538 unsigned CHS) { 2539 return new (C) IndirectFieldDecl(DC, L, Id, T, CH, CHS); 2540} 2541 2542SourceRange EnumConstantDecl::getSourceRange() const { 2543 SourceLocation End = getLocation(); 2544 if (Init) 2545 End = Init->getLocEnd(); 2546 return SourceRange(getLocation(), End); 2547} 2548 2549TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC, 2550 SourceLocation StartLoc, SourceLocation IdLoc, 2551 IdentifierInfo *Id, TypeSourceInfo *TInfo) { 2552 return new (C) TypedefDecl(DC, StartLoc, IdLoc, Id, TInfo); 2553} 2554 2555TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC, 2556 SourceLocation StartLoc, 2557 SourceLocation IdLoc, IdentifierInfo *Id, 2558 TypeSourceInfo *TInfo) { 2559 return new (C) TypeAliasDecl(DC, StartLoc, IdLoc, Id, TInfo); 2560} 2561 2562SourceRange TypedefDecl::getSourceRange() const { 2563 SourceLocation RangeEnd = getLocation(); 2564 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) { 2565 if (typeIsPostfix(TInfo->getType())) 2566 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd(); 2567 } 2568 return SourceRange(getLocStart(), RangeEnd); 2569} 2570 2571SourceRange TypeAliasDecl::getSourceRange() const { 2572 SourceLocation RangeEnd = getLocStart(); 2573 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) 2574 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd(); 2575 return SourceRange(getLocStart(), RangeEnd); 2576} 2577 2578FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC, 2579 StringLiteral *Str, 2580 SourceLocation AsmLoc, 2581 SourceLocation RParenLoc) { 2582 return new (C) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc); 2583} 2584