Decl.cpp revision 469a1eb996e1cb0be54f9b210f836afbddcbb2cc
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 "llvm/Support/ErrorHandling.h" 29 30using namespace clang; 31 32//===----------------------------------------------------------------------===// 33// NamedDecl Implementation 34//===----------------------------------------------------------------------===// 35 36static const VisibilityAttr *GetExplicitVisibility(const Decl *d) { 37 // Use the most recent declaration of a variable. 38 if (const VarDecl *var = dyn_cast<VarDecl>(d)) 39 return var->getMostRecentDeclaration()->getAttr<VisibilityAttr>(); 40 41 // Use the most recent declaration of a function, and also handle 42 // function template specializations. 43 if (const FunctionDecl *fn = dyn_cast<FunctionDecl>(d)) { 44 if (const VisibilityAttr *attr 45 = fn->getMostRecentDeclaration()->getAttr<VisibilityAttr>()) 46 return attr; 47 48 // If the function is a specialization of a template with an 49 // explicit visibility attribute, use that. 50 if (FunctionTemplateSpecializationInfo *templateInfo 51 = fn->getTemplateSpecializationInfo()) 52 return templateInfo->getTemplate()->getTemplatedDecl() 53 ->getAttr<VisibilityAttr>(); 54 55 return 0; 56 } 57 58 // Otherwise, just check the declaration itself first. 59 if (const VisibilityAttr *attr = d->getAttr<VisibilityAttr>()) 60 return attr; 61 62 // If there wasn't explicit visibility there, and this is a 63 // specialization of a class template, check for visibility 64 // on the pattern. 65 if (const ClassTemplateSpecializationDecl *spec 66 = dyn_cast<ClassTemplateSpecializationDecl>(d)) 67 return spec->getSpecializedTemplate()->getTemplatedDecl() 68 ->getAttr<VisibilityAttr>(); 69 70 return 0; 71} 72 73static Visibility GetVisibilityFromAttr(const VisibilityAttr *A) { 74 switch (A->getVisibility()) { 75 case VisibilityAttr::Default: 76 return DefaultVisibility; 77 case VisibilityAttr::Hidden: 78 return HiddenVisibility; 79 case VisibilityAttr::Protected: 80 return ProtectedVisibility; 81 } 82 return DefaultVisibility; 83} 84 85typedef NamedDecl::LinkageInfo LinkageInfo; 86typedef std::pair<Linkage,Visibility> LVPair; 87 88static LVPair merge(LVPair L, LVPair R) { 89 return LVPair(minLinkage(L.first, R.first), 90 minVisibility(L.second, R.second)); 91} 92 93static LVPair merge(LVPair L, LinkageInfo R) { 94 return LVPair(minLinkage(L.first, R.linkage()), 95 minVisibility(L.second, R.visibility())); 96} 97 98namespace { 99/// Flags controlling the computation of linkage and visibility. 100struct LVFlags { 101 bool ConsiderGlobalVisibility; 102 bool ConsiderVisibilityAttributes; 103 104 LVFlags() : ConsiderGlobalVisibility(true), 105 ConsiderVisibilityAttributes(true) { 106 } 107 108 /// \brief Returns a set of flags that is only useful for computing the 109 /// linkage, not the visibility, of a declaration. 110 static LVFlags CreateOnlyDeclLinkage() { 111 LVFlags F; 112 F.ConsiderGlobalVisibility = false; 113 F.ConsiderVisibilityAttributes = false; 114 return F; 115 } 116 117 /// Returns a set of flags, otherwise based on these, which ignores 118 /// off all sources of visibility except template arguments. 119 LVFlags onlyTemplateVisibility() const { 120 LVFlags F = *this; 121 F.ConsiderGlobalVisibility = false; 122 F.ConsiderVisibilityAttributes = false; 123 return F; 124 } 125}; 126} // end anonymous namespace 127 128/// \brief Get the most restrictive linkage for the types in the given 129/// template parameter list. 130static LVPair 131getLVForTemplateParameterList(const TemplateParameterList *Params) { 132 LVPair LV(ExternalLinkage, DefaultVisibility); 133 for (TemplateParameterList::const_iterator P = Params->begin(), 134 PEnd = Params->end(); 135 P != PEnd; ++P) { 136 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(*P)) { 137 if (NTTP->isExpandedParameterPack()) { 138 for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I) { 139 QualType T = NTTP->getExpansionType(I); 140 if (!T->isDependentType()) 141 LV = merge(LV, T->getLinkageAndVisibility()); 142 } 143 continue; 144 } 145 146 if (!NTTP->getType()->isDependentType()) { 147 LV = merge(LV, NTTP->getType()->getLinkageAndVisibility()); 148 continue; 149 } 150 } 151 152 if (TemplateTemplateParmDecl *TTP 153 = dyn_cast<TemplateTemplateParmDecl>(*P)) { 154 LV = merge(LV, getLVForTemplateParameterList(TTP->getTemplateParameters())); 155 } 156 } 157 158 return LV; 159} 160 161/// getLVForDecl - Get the linkage and visibility for the given declaration. 162static LinkageInfo getLVForDecl(const NamedDecl *D, LVFlags F); 163 164/// \brief Get the most restrictive linkage for the types and 165/// declarations in the given template argument list. 166static LVPair getLVForTemplateArgumentList(const TemplateArgument *Args, 167 unsigned NumArgs, 168 LVFlags &F) { 169 LVPair LV(ExternalLinkage, DefaultVisibility); 170 171 for (unsigned I = 0; I != NumArgs; ++I) { 172 switch (Args[I].getKind()) { 173 case TemplateArgument::Null: 174 case TemplateArgument::Integral: 175 case TemplateArgument::Expression: 176 break; 177 178 case TemplateArgument::Type: 179 LV = merge(LV, Args[I].getAsType()->getLinkageAndVisibility()); 180 break; 181 182 case TemplateArgument::Declaration: 183 // The decl can validly be null as the representation of nullptr 184 // arguments, valid only in C++0x. 185 if (Decl *D = Args[I].getAsDecl()) { 186 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 187 LV = merge(LV, getLVForDecl(ND, F)); 188 } 189 break; 190 191 case TemplateArgument::Template: 192 case TemplateArgument::TemplateExpansion: 193 if (TemplateDecl *Template 194 = Args[I].getAsTemplateOrTemplatePattern().getAsTemplateDecl()) 195 LV = merge(LV, getLVForDecl(Template, F)); 196 break; 197 198 case TemplateArgument::Pack: 199 LV = merge(LV, getLVForTemplateArgumentList(Args[I].pack_begin(), 200 Args[I].pack_size(), 201 F)); 202 break; 203 } 204 } 205 206 return LV; 207} 208 209static LVPair 210getLVForTemplateArgumentList(const TemplateArgumentList &TArgs, 211 LVFlags &F) { 212 return getLVForTemplateArgumentList(TArgs.data(), TArgs.size(), F); 213} 214 215static LinkageInfo getLVForNamespaceScopeDecl(const NamedDecl *D, LVFlags F) { 216 assert(D->getDeclContext()->getRedeclContext()->isFileContext() && 217 "Not a name having namespace scope"); 218 ASTContext &Context = D->getASTContext(); 219 220 // C++ [basic.link]p3: 221 // A name having namespace scope (3.3.6) has internal linkage if it 222 // is the name of 223 // - an object, reference, function or function template that is 224 // explicitly declared static; or, 225 // (This bullet corresponds to C99 6.2.2p3.) 226 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 227 // Explicitly declared static. 228 if (Var->getStorageClass() == SC_Static) 229 return LinkageInfo::internal(); 230 231 // - an object or reference that is explicitly declared const 232 // and neither explicitly declared extern nor previously 233 // declared to have external linkage; or 234 // (there is no equivalent in C99) 235 if (Context.getLangOptions().CPlusPlus && 236 Var->getType().isConstant(Context) && 237 Var->getStorageClass() != SC_Extern && 238 Var->getStorageClass() != SC_PrivateExtern) { 239 bool FoundExtern = false; 240 for (const VarDecl *PrevVar = Var->getPreviousDeclaration(); 241 PrevVar && !FoundExtern; 242 PrevVar = PrevVar->getPreviousDeclaration()) 243 if (isExternalLinkage(PrevVar->getLinkage())) 244 FoundExtern = true; 245 246 if (!FoundExtern) 247 return LinkageInfo::internal(); 248 } 249 } else if (isa<FunctionDecl>(D) || isa<FunctionTemplateDecl>(D)) { 250 // C++ [temp]p4: 251 // A non-member function template can have internal linkage; any 252 // other template name shall have external linkage. 253 const FunctionDecl *Function = 0; 254 if (const FunctionTemplateDecl *FunTmpl 255 = dyn_cast<FunctionTemplateDecl>(D)) 256 Function = FunTmpl->getTemplatedDecl(); 257 else 258 Function = cast<FunctionDecl>(D); 259 260 // Explicitly declared static. 261 if (Function->getStorageClass() == SC_Static) 262 return LinkageInfo(InternalLinkage, DefaultVisibility, false); 263 } else if (const FieldDecl *Field = dyn_cast<FieldDecl>(D)) { 264 // - a data member of an anonymous union. 265 if (cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion()) 266 return LinkageInfo::internal(); 267 } 268 269 if (D->isInAnonymousNamespace()) 270 return LinkageInfo::uniqueExternal(); 271 272 // Set up the defaults. 273 274 // C99 6.2.2p5: 275 // If the declaration of an identifier for an object has file 276 // scope and no storage-class specifier, its linkage is 277 // external. 278 LinkageInfo LV; 279 280 if (F.ConsiderVisibilityAttributes) { 281 if (const VisibilityAttr *VA = GetExplicitVisibility(D)) { 282 LV.setVisibility(GetVisibilityFromAttr(VA), true); 283 F.ConsiderGlobalVisibility = false; 284 } else { 285 // If we're declared in a namespace with a visibility attribute, 286 // use that namespace's visibility, but don't call it explicit. 287 for (const DeclContext *DC = D->getDeclContext(); 288 !isa<TranslationUnitDecl>(DC); 289 DC = DC->getParent()) { 290 if (!isa<NamespaceDecl>(DC)) continue; 291 if (const VisibilityAttr *VA = 292 cast<NamespaceDecl>(DC)->getAttr<VisibilityAttr>()) { 293 LV.setVisibility(GetVisibilityFromAttr(VA), false); 294 F.ConsiderGlobalVisibility = false; 295 break; 296 } 297 } 298 } 299 } 300 301 // C++ [basic.link]p4: 302 303 // A name having namespace scope has external linkage if it is the 304 // name of 305 // 306 // - an object or reference, unless it has internal linkage; or 307 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 308 // GCC applies the following optimization to variables and static 309 // data members, but not to functions: 310 // 311 // Modify the variable's LV by the LV of its type unless this is 312 // C or extern "C". This follows from [basic.link]p9: 313 // A type without linkage shall not be used as the type of a 314 // variable or function with external linkage unless 315 // - the entity has C language linkage, or 316 // - the entity is declared within an unnamed namespace, or 317 // - the entity is not used or is defined in the same 318 // translation unit. 319 // and [basic.link]p10: 320 // ...the types specified by all declarations referring to a 321 // given variable or function shall be identical... 322 // C does not have an equivalent rule. 323 // 324 // Ignore this if we've got an explicit attribute; the user 325 // probably knows what they're doing. 326 // 327 // Note that we don't want to make the variable non-external 328 // because of this, but unique-external linkage suits us. 329 if (Context.getLangOptions().CPlusPlus && !Var->isExternC()) { 330 LVPair TypeLV = Var->getType()->getLinkageAndVisibility(); 331 if (TypeLV.first != ExternalLinkage) 332 return LinkageInfo::uniqueExternal(); 333 if (!LV.visibilityExplicit()) 334 LV.mergeVisibility(TypeLV.second); 335 } 336 337 if (Var->getStorageClass() == SC_PrivateExtern) 338 LV.setVisibility(HiddenVisibility, true); 339 340 if (!Context.getLangOptions().CPlusPlus && 341 (Var->getStorageClass() == SC_Extern || 342 Var->getStorageClass() == SC_PrivateExtern)) { 343 344 // C99 6.2.2p4: 345 // For an identifier declared with the storage-class specifier 346 // extern in a scope in which a prior declaration of that 347 // identifier is visible, if the prior declaration specifies 348 // internal or external linkage, the linkage of the identifier 349 // at the later declaration is the same as the linkage 350 // specified at the prior declaration. If no prior declaration 351 // is visible, or if the prior declaration specifies no 352 // linkage, then the identifier has external linkage. 353 if (const VarDecl *PrevVar = Var->getPreviousDeclaration()) { 354 LinkageInfo PrevLV = getLVForDecl(PrevVar, F); 355 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 356 LV.mergeVisibility(PrevLV); 357 } 358 } 359 360 // - a function, unless it has internal linkage; or 361 } else if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 362 // In theory, we can modify the function's LV by the LV of its 363 // type unless it has C linkage (see comment above about variables 364 // for justification). In practice, GCC doesn't do this, so it's 365 // just too painful to make work. 366 367 if (Function->getStorageClass() == SC_PrivateExtern) 368 LV.setVisibility(HiddenVisibility, true); 369 370 // C99 6.2.2p5: 371 // If the declaration of an identifier for a function has no 372 // storage-class specifier, its linkage is determined exactly 373 // as if it were declared with the storage-class specifier 374 // extern. 375 if (!Context.getLangOptions().CPlusPlus && 376 (Function->getStorageClass() == SC_Extern || 377 Function->getStorageClass() == SC_PrivateExtern || 378 Function->getStorageClass() == SC_None)) { 379 // C99 6.2.2p4: 380 // For an identifier declared with the storage-class specifier 381 // extern in a scope in which a prior declaration of that 382 // identifier is visible, if the prior declaration specifies 383 // internal or external linkage, the linkage of the identifier 384 // at the later declaration is the same as the linkage 385 // specified at the prior declaration. If no prior declaration 386 // is visible, or if the prior declaration specifies no 387 // linkage, then the identifier has external linkage. 388 if (const FunctionDecl *PrevFunc = Function->getPreviousDeclaration()) { 389 LinkageInfo PrevLV = getLVForDecl(PrevFunc, F); 390 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 391 LV.mergeVisibility(PrevLV); 392 } 393 } 394 395 if (FunctionTemplateSpecializationInfo *SpecInfo 396 = Function->getTemplateSpecializationInfo()) { 397 LV.merge(getLVForDecl(SpecInfo->getTemplate(), 398 F.onlyTemplateVisibility())); 399 const TemplateArgumentList &TemplateArgs = *SpecInfo->TemplateArguments; 400 LV.merge(getLVForTemplateArgumentList(TemplateArgs, F)); 401 } 402 403 // - a named class (Clause 9), or an unnamed class defined in a 404 // typedef declaration in which the class has the typedef name 405 // for linkage purposes (7.1.3); or 406 // - a named enumeration (7.2), or an unnamed enumeration 407 // defined in a typedef declaration in which the enumeration 408 // has the typedef name for linkage purposes (7.1.3); or 409 } else if (const TagDecl *Tag = dyn_cast<TagDecl>(D)) { 410 // Unnamed tags have no linkage. 411 if (!Tag->getDeclName() && !Tag->getTypedefForAnonDecl()) 412 return LinkageInfo::none(); 413 414 // If this is a class template specialization, consider the 415 // linkage of the template and template arguments. 416 if (const ClassTemplateSpecializationDecl *Spec 417 = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) { 418 // From the template. 419 LV.merge(getLVForDecl(Spec->getSpecializedTemplate(), 420 F.onlyTemplateVisibility())); 421 422 // The arguments at which the template was instantiated. 423 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 424 LV.merge(getLVForTemplateArgumentList(TemplateArgs, F)); 425 } 426 427 // Consider -fvisibility unless the type has C linkage. 428 if (F.ConsiderGlobalVisibility) 429 F.ConsiderGlobalVisibility = 430 (Context.getLangOptions().CPlusPlus && 431 !Tag->getDeclContext()->isExternCContext()); 432 433 // - an enumerator belonging to an enumeration with external linkage; 434 } else if (isa<EnumConstantDecl>(D)) { 435 LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()), F); 436 if (!isExternalLinkage(EnumLV.linkage())) 437 return LinkageInfo::none(); 438 LV.merge(EnumLV); 439 440 // - a template, unless it is a function template that has 441 // internal linkage (Clause 14); 442 } else if (const TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) { 443 LV.merge(getLVForTemplateParameterList(Template->getTemplateParameters())); 444 445 // - a namespace (7.3), unless it is declared within an unnamed 446 // namespace. 447 } else if (isa<NamespaceDecl>(D) && !D->isInAnonymousNamespace()) { 448 return LV; 449 450 // By extension, we assign external linkage to Objective-C 451 // interfaces. 452 } else if (isa<ObjCInterfaceDecl>(D)) { 453 // fallout 454 455 // Everything not covered here has no linkage. 456 } else { 457 return LinkageInfo::none(); 458 } 459 460 // If we ended up with non-external linkage, visibility should 461 // always be default. 462 if (LV.linkage() != ExternalLinkage) 463 return LinkageInfo(LV.linkage(), DefaultVisibility, false); 464 465 // If we didn't end up with hidden visibility, consider attributes 466 // and -fvisibility. 467 if (F.ConsiderGlobalVisibility) 468 LV.mergeVisibility(Context.getLangOptions().getVisibilityMode()); 469 470 return LV; 471} 472 473static LinkageInfo getLVForClassMember(const NamedDecl *D, LVFlags F) { 474 // Only certain class members have linkage. Note that fields don't 475 // really have linkage, but it's convenient to say they do for the 476 // purposes of calculating linkage of pointer-to-data-member 477 // template arguments. 478 if (!(isa<CXXMethodDecl>(D) || 479 isa<VarDecl>(D) || 480 isa<FieldDecl>(D) || 481 (isa<TagDecl>(D) && 482 (D->getDeclName() || cast<TagDecl>(D)->getTypedefForAnonDecl())))) 483 return LinkageInfo::none(); 484 485 LinkageInfo LV; 486 487 // The flags we're going to use to compute the class's visibility. 488 LVFlags ClassF = F; 489 490 // If we have an explicit visibility attribute, merge that in. 491 if (F.ConsiderVisibilityAttributes) { 492 if (const VisibilityAttr *VA = GetExplicitVisibility(D)) { 493 LV.mergeVisibility(GetVisibilityFromAttr(VA), true); 494 495 // Ignore global visibility later, but not this attribute. 496 F.ConsiderGlobalVisibility = false; 497 498 // Ignore both global visibility and attributes when computing our 499 // parent's visibility. 500 ClassF = F.onlyTemplateVisibility(); 501 } 502 } 503 504 // Class members only have linkage if their class has external 505 // linkage. 506 LV.merge(getLVForDecl(cast<RecordDecl>(D->getDeclContext()), ClassF)); 507 if (!isExternalLinkage(LV.linkage())) 508 return LinkageInfo::none(); 509 510 // If the class already has unique-external linkage, we can't improve. 511 if (LV.linkage() == UniqueExternalLinkage) 512 return LinkageInfo::uniqueExternal(); 513 514 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 515 TemplateSpecializationKind TSK = TSK_Undeclared; 516 517 // If this is a method template specialization, use the linkage for 518 // the template parameters and arguments. 519 if (FunctionTemplateSpecializationInfo *Spec 520 = MD->getTemplateSpecializationInfo()) { 521 LV.merge(getLVForTemplateArgumentList(*Spec->TemplateArguments, F)); 522 LV.merge(getLVForTemplateParameterList( 523 Spec->getTemplate()->getTemplateParameters())); 524 525 TSK = Spec->getTemplateSpecializationKind(); 526 } else if (MemberSpecializationInfo *MSI = 527 MD->getMemberSpecializationInfo()) { 528 TSK = MSI->getTemplateSpecializationKind(); 529 } 530 531 // If we're paying attention to global visibility, apply 532 // -finline-visibility-hidden if this is an inline method. 533 // 534 // Note that ConsiderGlobalVisibility doesn't yet have information 535 // about whether containing classes have visibility attributes, 536 // and that's intentional. 537 if (TSK != TSK_ExplicitInstantiationDeclaration && 538 F.ConsiderGlobalVisibility && 539 MD->getASTContext().getLangOptions().InlineVisibilityHidden) { 540 // InlineVisibilityHidden only applies to definitions, and 541 // isInlined() only gives meaningful answers on definitions 542 // anyway. 543 const FunctionDecl *Def = 0; 544 if (MD->hasBody(Def) && Def->isInlined()) 545 LV.setVisibility(HiddenVisibility); 546 } 547 548 // Note that in contrast to basically every other situation, we 549 // *do* apply -fvisibility to method declarations. 550 551 } else if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) { 552 if (const ClassTemplateSpecializationDecl *Spec 553 = dyn_cast<ClassTemplateSpecializationDecl>(RD)) { 554 // Merge template argument/parameter information for member 555 // class template specializations. 556 LV.merge(getLVForTemplateArgumentList(Spec->getTemplateArgs(), F)); 557 LV.merge(getLVForTemplateParameterList( 558 Spec->getSpecializedTemplate()->getTemplateParameters())); 559 } 560 561 // Static data members. 562 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 563 // Modify the variable's linkage by its type, but ignore the 564 // type's visibility unless it's a definition. 565 LVPair TypeLV = VD->getType()->getLinkageAndVisibility(); 566 if (TypeLV.first != ExternalLinkage) 567 LV.mergeLinkage(UniqueExternalLinkage); 568 if (!LV.visibilityExplicit()) 569 LV.mergeVisibility(TypeLV.second); 570 } 571 572 F.ConsiderGlobalVisibility &= !LV.visibilityExplicit(); 573 574 // Apply -fvisibility if desired. 575 if (F.ConsiderGlobalVisibility && LV.visibility() != HiddenVisibility) { 576 LV.mergeVisibility(D->getASTContext().getLangOptions().getVisibilityMode()); 577 } 578 579 return LV; 580} 581 582Linkage NamedDecl::getLinkage() const { 583 if (HasCachedLinkage) { 584 assert(Linkage(CachedLinkage) == 585 getLVForDecl(this, LVFlags::CreateOnlyDeclLinkage()).linkage()); 586 return Linkage(CachedLinkage); 587 } 588 589 CachedLinkage = getLVForDecl(this, 590 LVFlags::CreateOnlyDeclLinkage()).linkage(); 591 HasCachedLinkage = 1; 592 return Linkage(CachedLinkage); 593} 594 595LinkageInfo NamedDecl::getLinkageAndVisibility() const { 596 LinkageInfo LI = getLVForDecl(this, LVFlags()); 597 assert(!HasCachedLinkage || Linkage(CachedLinkage) == LI.linkage()); 598 HasCachedLinkage = 1; 599 CachedLinkage = LI.linkage(); 600 return LI; 601} 602 603static LinkageInfo getLVForDecl(const NamedDecl *D, LVFlags Flags) { 604 // Objective-C: treat all Objective-C declarations as having external 605 // linkage. 606 switch (D->getKind()) { 607 default: 608 break; 609 case Decl::TemplateTemplateParm: // count these as external 610 case Decl::NonTypeTemplateParm: 611 case Decl::ObjCAtDefsField: 612 case Decl::ObjCCategory: 613 case Decl::ObjCCategoryImpl: 614 case Decl::ObjCCompatibleAlias: 615 case Decl::ObjCForwardProtocol: 616 case Decl::ObjCImplementation: 617 case Decl::ObjCMethod: 618 case Decl::ObjCProperty: 619 case Decl::ObjCPropertyImpl: 620 case Decl::ObjCProtocol: 621 return LinkageInfo::external(); 622 } 623 624 // Handle linkage for namespace-scope names. 625 if (D->getDeclContext()->getRedeclContext()->isFileContext()) 626 return getLVForNamespaceScopeDecl(D, Flags); 627 628 // C++ [basic.link]p5: 629 // In addition, a member function, static data member, a named 630 // class or enumeration of class scope, or an unnamed class or 631 // enumeration defined in a class-scope typedef declaration such 632 // that the class or enumeration has the typedef name for linkage 633 // purposes (7.1.3), has external linkage if the name of the class 634 // has external linkage. 635 if (D->getDeclContext()->isRecord()) 636 return getLVForClassMember(D, Flags); 637 638 // C++ [basic.link]p6: 639 // The name of a function declared in block scope and the name of 640 // an object declared by a block scope extern declaration have 641 // linkage. If there is a visible declaration of an entity with 642 // linkage having the same name and type, ignoring entities 643 // declared outside the innermost enclosing namespace scope, the 644 // block scope declaration declares that same entity and receives 645 // the linkage of the previous declaration. If there is more than 646 // one such matching entity, the program is ill-formed. Otherwise, 647 // if no matching entity is found, the block scope entity receives 648 // external linkage. 649 if (D->getLexicalDeclContext()->isFunctionOrMethod()) { 650 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 651 if (Function->isInAnonymousNamespace()) 652 return LinkageInfo::uniqueExternal(); 653 654 LinkageInfo LV; 655 if (Flags.ConsiderVisibilityAttributes) { 656 if (const VisibilityAttr *VA = GetExplicitVisibility(Function)) 657 LV.setVisibility(GetVisibilityFromAttr(VA)); 658 } 659 660 if (const FunctionDecl *Prev = Function->getPreviousDeclaration()) { 661 LinkageInfo PrevLV = getLVForDecl(Prev, Flags); 662 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 663 LV.mergeVisibility(PrevLV); 664 } 665 666 return LV; 667 } 668 669 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) 670 if (Var->getStorageClass() == SC_Extern || 671 Var->getStorageClass() == SC_PrivateExtern) { 672 if (Var->isInAnonymousNamespace()) 673 return LinkageInfo::uniqueExternal(); 674 675 LinkageInfo LV; 676 if (Var->getStorageClass() == SC_PrivateExtern) 677 LV.setVisibility(HiddenVisibility); 678 else if (Flags.ConsiderVisibilityAttributes) { 679 if (const VisibilityAttr *VA = GetExplicitVisibility(Var)) 680 LV.setVisibility(GetVisibilityFromAttr(VA)); 681 } 682 683 if (const VarDecl *Prev = Var->getPreviousDeclaration()) { 684 LinkageInfo PrevLV = getLVForDecl(Prev, Flags); 685 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 686 LV.mergeVisibility(PrevLV); 687 } 688 689 return LV; 690 } 691 } 692 693 // C++ [basic.link]p6: 694 // Names not covered by these rules have no linkage. 695 return LinkageInfo::none(); 696} 697 698std::string NamedDecl::getQualifiedNameAsString() const { 699 return getQualifiedNameAsString(getASTContext().getLangOptions()); 700} 701 702std::string NamedDecl::getQualifiedNameAsString(const PrintingPolicy &P) const { 703 const DeclContext *Ctx = getDeclContext(); 704 705 if (Ctx->isFunctionOrMethod()) 706 return getNameAsString(); 707 708 typedef llvm::SmallVector<const DeclContext *, 8> ContextsTy; 709 ContextsTy Contexts; 710 711 // Collect contexts. 712 while (Ctx && isa<NamedDecl>(Ctx)) { 713 Contexts.push_back(Ctx); 714 Ctx = Ctx->getParent(); 715 }; 716 717 std::string QualName; 718 llvm::raw_string_ostream OS(QualName); 719 720 for (ContextsTy::reverse_iterator I = Contexts.rbegin(), E = Contexts.rend(); 721 I != E; ++I) { 722 if (const ClassTemplateSpecializationDecl *Spec 723 = dyn_cast<ClassTemplateSpecializationDecl>(*I)) { 724 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 725 std::string TemplateArgsStr 726 = TemplateSpecializationType::PrintTemplateArgumentList( 727 TemplateArgs.data(), 728 TemplateArgs.size(), 729 P); 730 OS << Spec->getName() << TemplateArgsStr; 731 } else if (const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(*I)) { 732 if (ND->isAnonymousNamespace()) 733 OS << "<anonymous namespace>"; 734 else 735 OS << ND; 736 } else if (const RecordDecl *RD = dyn_cast<RecordDecl>(*I)) { 737 if (!RD->getIdentifier()) 738 OS << "<anonymous " << RD->getKindName() << '>'; 739 else 740 OS << RD; 741 } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) { 742 const FunctionProtoType *FT = 0; 743 if (FD->hasWrittenPrototype()) 744 FT = dyn_cast<FunctionProtoType>(FD->getType()->getAs<FunctionType>()); 745 746 OS << FD << '('; 747 if (FT) { 748 unsigned NumParams = FD->getNumParams(); 749 for (unsigned i = 0; i < NumParams; ++i) { 750 if (i) 751 OS << ", "; 752 std::string Param; 753 FD->getParamDecl(i)->getType().getAsStringInternal(Param, P); 754 OS << Param; 755 } 756 757 if (FT->isVariadic()) { 758 if (NumParams > 0) 759 OS << ", "; 760 OS << "..."; 761 } 762 } 763 OS << ')'; 764 } else { 765 OS << cast<NamedDecl>(*I); 766 } 767 OS << "::"; 768 } 769 770 if (getDeclName()) 771 OS << this; 772 else 773 OS << "<anonymous>"; 774 775 return OS.str(); 776} 777 778bool NamedDecl::declarationReplaces(NamedDecl *OldD) const { 779 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch"); 780 781 // UsingDirectiveDecl's are not really NamedDecl's, and all have same name. 782 // We want to keep it, unless it nominates same namespace. 783 if (getKind() == Decl::UsingDirective) { 784 return cast<UsingDirectiveDecl>(this)->getNominatedNamespace() == 785 cast<UsingDirectiveDecl>(OldD)->getNominatedNamespace(); 786 } 787 788 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) 789 // For function declarations, we keep track of redeclarations. 790 return FD->getPreviousDeclaration() == OldD; 791 792 // For function templates, the underlying function declarations are linked. 793 if (const FunctionTemplateDecl *FunctionTemplate 794 = dyn_cast<FunctionTemplateDecl>(this)) 795 if (const FunctionTemplateDecl *OldFunctionTemplate 796 = dyn_cast<FunctionTemplateDecl>(OldD)) 797 return FunctionTemplate->getTemplatedDecl() 798 ->declarationReplaces(OldFunctionTemplate->getTemplatedDecl()); 799 800 // For method declarations, we keep track of redeclarations. 801 if (isa<ObjCMethodDecl>(this)) 802 return false; 803 804 if (isa<ObjCInterfaceDecl>(this) && isa<ObjCCompatibleAliasDecl>(OldD)) 805 return true; 806 807 if (isa<UsingShadowDecl>(this) && isa<UsingShadowDecl>(OldD)) 808 return cast<UsingShadowDecl>(this)->getTargetDecl() == 809 cast<UsingShadowDecl>(OldD)->getTargetDecl(); 810 811 if (isa<UsingDecl>(this) && isa<UsingDecl>(OldD)) 812 return cast<UsingDecl>(this)->getTargetNestedNameDecl() == 813 cast<UsingDecl>(OldD)->getTargetNestedNameDecl(); 814 815 // For non-function declarations, if the declarations are of the 816 // same kind then this must be a redeclaration, or semantic analysis 817 // would not have given us the new declaration. 818 return this->getKind() == OldD->getKind(); 819} 820 821bool NamedDecl::hasLinkage() const { 822 return getLinkage() != NoLinkage; 823} 824 825NamedDecl *NamedDecl::getUnderlyingDecl() { 826 NamedDecl *ND = this; 827 while (true) { 828 if (UsingShadowDecl *UD = dyn_cast<UsingShadowDecl>(ND)) 829 ND = UD->getTargetDecl(); 830 else if (ObjCCompatibleAliasDecl *AD 831 = dyn_cast<ObjCCompatibleAliasDecl>(ND)) 832 return AD->getClassInterface(); 833 else 834 return ND; 835 } 836} 837 838bool NamedDecl::isCXXInstanceMember() const { 839 assert(isCXXClassMember() && 840 "checking whether non-member is instance member"); 841 842 const NamedDecl *D = this; 843 if (isa<UsingShadowDecl>(D)) 844 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 845 846 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D)) 847 return true; 848 if (isa<CXXMethodDecl>(D)) 849 return cast<CXXMethodDecl>(D)->isInstance(); 850 if (isa<FunctionTemplateDecl>(D)) 851 return cast<CXXMethodDecl>(cast<FunctionTemplateDecl>(D) 852 ->getTemplatedDecl())->isInstance(); 853 return false; 854} 855 856//===----------------------------------------------------------------------===// 857// DeclaratorDecl Implementation 858//===----------------------------------------------------------------------===// 859 860template <typename DeclT> 861static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) { 862 if (decl->getNumTemplateParameterLists() > 0) 863 return decl->getTemplateParameterList(0)->getTemplateLoc(); 864 else 865 return decl->getInnerLocStart(); 866} 867 868SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const { 869 TypeSourceInfo *TSI = getTypeSourceInfo(); 870 if (TSI) return TSI->getTypeLoc().getBeginLoc(); 871 return SourceLocation(); 872} 873 874void DeclaratorDecl::setQualifierInfo(NestedNameSpecifier *Qualifier, 875 SourceRange QualifierRange) { 876 if (Qualifier) { 877 // Make sure the extended decl info is allocated. 878 if (!hasExtInfo()) { 879 // Save (non-extended) type source info pointer. 880 TypeSourceInfo *savedTInfo = DeclInfo.get<TypeSourceInfo*>(); 881 // Allocate external info struct. 882 DeclInfo = new (getASTContext()) ExtInfo; 883 // Restore savedTInfo into (extended) decl info. 884 getExtInfo()->TInfo = savedTInfo; 885 } 886 // Set qualifier info. 887 getExtInfo()->NNS = Qualifier; 888 getExtInfo()->NNSRange = QualifierRange; 889 } 890 else { 891 // Here Qualifier == 0, i.e., we are removing the qualifier (if any). 892 assert(QualifierRange.isInvalid()); 893 if (hasExtInfo()) { 894 // Save type source info pointer. 895 TypeSourceInfo *savedTInfo = getExtInfo()->TInfo; 896 // Deallocate the extended decl info. 897 getASTContext().Deallocate(getExtInfo()); 898 // Restore savedTInfo into (non-extended) decl info. 899 DeclInfo = savedTInfo; 900 } 901 } 902} 903 904SourceLocation DeclaratorDecl::getOuterLocStart() const { 905 return getTemplateOrInnerLocStart(this); 906} 907 908void 909QualifierInfo::setTemplateParameterListsInfo(ASTContext &Context, 910 unsigned NumTPLists, 911 TemplateParameterList **TPLists) { 912 assert((NumTPLists == 0 || TPLists != 0) && 913 "Empty array of template parameters with positive size!"); 914 assert((NumTPLists == 0 || NNS) && 915 "Nonempty array of template parameters with no qualifier!"); 916 917 // Free previous template parameters (if any). 918 if (NumTemplParamLists > 0) { 919 Context.Deallocate(TemplParamLists); 920 TemplParamLists = 0; 921 NumTemplParamLists = 0; 922 } 923 // Set info on matched template parameter lists (if any). 924 if (NumTPLists > 0) { 925 TemplParamLists = new (Context) TemplateParameterList*[NumTPLists]; 926 NumTemplParamLists = NumTPLists; 927 for (unsigned i = NumTPLists; i-- > 0; ) 928 TemplParamLists[i] = TPLists[i]; 929 } 930} 931 932//===----------------------------------------------------------------------===// 933// VarDecl Implementation 934//===----------------------------------------------------------------------===// 935 936const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) { 937 switch (SC) { 938 case SC_None: break; 939 case SC_Auto: return "auto"; break; 940 case SC_Extern: return "extern"; break; 941 case SC_PrivateExtern: return "__private_extern__"; break; 942 case SC_Register: return "register"; break; 943 case SC_Static: return "static"; break; 944 } 945 946 assert(0 && "Invalid storage class"); 947 return 0; 948} 949 950VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L, 951 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, 952 StorageClass S, StorageClass SCAsWritten) { 953 return new (C) VarDecl(Var, DC, L, Id, T, TInfo, S, SCAsWritten); 954} 955 956void VarDecl::setStorageClass(StorageClass SC) { 957 assert(isLegalForVariable(SC)); 958 if (getStorageClass() != SC) 959 ClearLinkageCache(); 960 961 SClass = SC; 962} 963 964SourceLocation VarDecl::getInnerLocStart() const { 965 SourceLocation Start = getTypeSpecStartLoc(); 966 if (Start.isInvalid()) 967 Start = getLocation(); 968 return Start; 969} 970 971SourceRange VarDecl::getSourceRange() const { 972 if (getInit()) 973 return SourceRange(getOuterLocStart(), getInit()->getLocEnd()); 974 return SourceRange(getOuterLocStart(), getLocation()); 975} 976 977bool VarDecl::isExternC() const { 978 ASTContext &Context = getASTContext(); 979 if (!Context.getLangOptions().CPlusPlus) 980 return (getDeclContext()->isTranslationUnit() && 981 getStorageClass() != SC_Static) || 982 (getDeclContext()->isFunctionOrMethod() && hasExternalStorage()); 983 984 for (const DeclContext *DC = getDeclContext(); !DC->isTranslationUnit(); 985 DC = DC->getParent()) { 986 if (const LinkageSpecDecl *Linkage = dyn_cast<LinkageSpecDecl>(DC)) { 987 if (Linkage->getLanguage() == LinkageSpecDecl::lang_c) 988 return getStorageClass() != SC_Static; 989 990 break; 991 } 992 993 if (DC->isFunctionOrMethod()) 994 return false; 995 } 996 997 return false; 998} 999 1000VarDecl *VarDecl::getCanonicalDecl() { 1001 return getFirstDeclaration(); 1002} 1003 1004VarDecl::DefinitionKind VarDecl::isThisDeclarationADefinition() const { 1005 // C++ [basic.def]p2: 1006 // A declaration is a definition unless [...] it contains the 'extern' 1007 // specifier or a linkage-specification and neither an initializer [...], 1008 // it declares a static data member in a class declaration [...]. 1009 // C++ [temp.expl.spec]p15: 1010 // An explicit specialization of a static data member of a template is a 1011 // definition if the declaration includes an initializer; otherwise, it is 1012 // a declaration. 1013 if (isStaticDataMember()) { 1014 if (isOutOfLine() && (hasInit() || 1015 getTemplateSpecializationKind() != TSK_ExplicitSpecialization)) 1016 return Definition; 1017 else 1018 return DeclarationOnly; 1019 } 1020 // C99 6.7p5: 1021 // A definition of an identifier is a declaration for that identifier that 1022 // [...] causes storage to be reserved for that object. 1023 // Note: that applies for all non-file-scope objects. 1024 // C99 6.9.2p1: 1025 // If the declaration of an identifier for an object has file scope and an 1026 // initializer, the declaration is an external definition for the identifier 1027 if (hasInit()) 1028 return Definition; 1029 // AST for 'extern "C" int foo;' is annotated with 'extern'. 1030 if (hasExternalStorage()) 1031 return DeclarationOnly; 1032 1033 if (getStorageClassAsWritten() == SC_Extern || 1034 getStorageClassAsWritten() == SC_PrivateExtern) { 1035 for (const VarDecl *PrevVar = getPreviousDeclaration(); 1036 PrevVar; PrevVar = PrevVar->getPreviousDeclaration()) { 1037 if (PrevVar->getLinkage() == InternalLinkage && PrevVar->hasInit()) 1038 return DeclarationOnly; 1039 } 1040 } 1041 // C99 6.9.2p2: 1042 // A declaration of an object that has file scope without an initializer, 1043 // and without a storage class specifier or the scs 'static', constitutes 1044 // a tentative definition. 1045 // No such thing in C++. 1046 if (!getASTContext().getLangOptions().CPlusPlus && isFileVarDecl()) 1047 return TentativeDefinition; 1048 1049 // What's left is (in C, block-scope) declarations without initializers or 1050 // external storage. These are definitions. 1051 return Definition; 1052} 1053 1054VarDecl *VarDecl::getActingDefinition() { 1055 DefinitionKind Kind = isThisDeclarationADefinition(); 1056 if (Kind != TentativeDefinition) 1057 return 0; 1058 1059 VarDecl *LastTentative = 0; 1060 VarDecl *First = getFirstDeclaration(); 1061 for (redecl_iterator I = First->redecls_begin(), E = First->redecls_end(); 1062 I != E; ++I) { 1063 Kind = (*I)->isThisDeclarationADefinition(); 1064 if (Kind == Definition) 1065 return 0; 1066 else if (Kind == TentativeDefinition) 1067 LastTentative = *I; 1068 } 1069 return LastTentative; 1070} 1071 1072bool VarDecl::isTentativeDefinitionNow() const { 1073 DefinitionKind Kind = isThisDeclarationADefinition(); 1074 if (Kind != TentativeDefinition) 1075 return false; 1076 1077 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1078 if ((*I)->isThisDeclarationADefinition() == Definition) 1079 return false; 1080 } 1081 return true; 1082} 1083 1084VarDecl *VarDecl::getDefinition() { 1085 VarDecl *First = getFirstDeclaration(); 1086 for (redecl_iterator I = First->redecls_begin(), E = First->redecls_end(); 1087 I != E; ++I) { 1088 if ((*I)->isThisDeclarationADefinition() == Definition) 1089 return *I; 1090 } 1091 return 0; 1092} 1093 1094VarDecl::DefinitionKind VarDecl::hasDefinition() const { 1095 DefinitionKind Kind = DeclarationOnly; 1096 1097 const VarDecl *First = getFirstDeclaration(); 1098 for (redecl_iterator I = First->redecls_begin(), E = First->redecls_end(); 1099 I != E; ++I) 1100 Kind = std::max(Kind, (*I)->isThisDeclarationADefinition()); 1101 1102 return Kind; 1103} 1104 1105const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const { 1106 redecl_iterator I = redecls_begin(), E = redecls_end(); 1107 while (I != E && !I->getInit()) 1108 ++I; 1109 1110 if (I != E) { 1111 D = *I; 1112 return I->getInit(); 1113 } 1114 return 0; 1115} 1116 1117bool VarDecl::isOutOfLine() const { 1118 if (Decl::isOutOfLine()) 1119 return true; 1120 1121 if (!isStaticDataMember()) 1122 return false; 1123 1124 // If this static data member was instantiated from a static data member of 1125 // a class template, check whether that static data member was defined 1126 // out-of-line. 1127 if (VarDecl *VD = getInstantiatedFromStaticDataMember()) 1128 return VD->isOutOfLine(); 1129 1130 return false; 1131} 1132 1133VarDecl *VarDecl::getOutOfLineDefinition() { 1134 if (!isStaticDataMember()) 1135 return 0; 1136 1137 for (VarDecl::redecl_iterator RD = redecls_begin(), RDEnd = redecls_end(); 1138 RD != RDEnd; ++RD) { 1139 if (RD->getLexicalDeclContext()->isFileContext()) 1140 return *RD; 1141 } 1142 1143 return 0; 1144} 1145 1146void VarDecl::setInit(Expr *I) { 1147 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>()) { 1148 Eval->~EvaluatedStmt(); 1149 getASTContext().Deallocate(Eval); 1150 } 1151 1152 Init = I; 1153} 1154 1155VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const { 1156 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) 1157 return cast<VarDecl>(MSI->getInstantiatedFrom()); 1158 1159 return 0; 1160} 1161 1162TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const { 1163 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) 1164 return MSI->getTemplateSpecializationKind(); 1165 1166 return TSK_Undeclared; 1167} 1168 1169MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const { 1170 return getASTContext().getInstantiatedFromStaticDataMember(this); 1171} 1172 1173void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK, 1174 SourceLocation PointOfInstantiation) { 1175 MemberSpecializationInfo *MSI = getMemberSpecializationInfo(); 1176 assert(MSI && "Not an instantiated static data member?"); 1177 MSI->setTemplateSpecializationKind(TSK); 1178 if (TSK != TSK_ExplicitSpecialization && 1179 PointOfInstantiation.isValid() && 1180 MSI->getPointOfInstantiation().isInvalid()) 1181 MSI->setPointOfInstantiation(PointOfInstantiation); 1182} 1183 1184//===----------------------------------------------------------------------===// 1185// ParmVarDecl Implementation 1186//===----------------------------------------------------------------------===// 1187 1188ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC, 1189 SourceLocation L, IdentifierInfo *Id, 1190 QualType T, TypeSourceInfo *TInfo, 1191 StorageClass S, StorageClass SCAsWritten, 1192 Expr *DefArg) { 1193 return new (C) ParmVarDecl(ParmVar, DC, L, Id, T, TInfo, 1194 S, SCAsWritten, DefArg); 1195} 1196 1197Expr *ParmVarDecl::getDefaultArg() { 1198 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!"); 1199 assert(!hasUninstantiatedDefaultArg() && 1200 "Default argument is not yet instantiated!"); 1201 1202 Expr *Arg = getInit(); 1203 if (ExprWithCleanups *E = dyn_cast_or_null<ExprWithCleanups>(Arg)) 1204 return E->getSubExpr(); 1205 1206 return Arg; 1207} 1208 1209unsigned ParmVarDecl::getNumDefaultArgTemporaries() const { 1210 if (const ExprWithCleanups *E = dyn_cast<ExprWithCleanups>(getInit())) 1211 return E->getNumTemporaries(); 1212 1213 return 0; 1214} 1215 1216CXXTemporary *ParmVarDecl::getDefaultArgTemporary(unsigned i) { 1217 assert(getNumDefaultArgTemporaries() && 1218 "Default arguments does not have any temporaries!"); 1219 1220 ExprWithCleanups *E = cast<ExprWithCleanups>(getInit()); 1221 return E->getTemporary(i); 1222} 1223 1224SourceRange ParmVarDecl::getDefaultArgRange() const { 1225 if (const Expr *E = getInit()) 1226 return E->getSourceRange(); 1227 1228 if (hasUninstantiatedDefaultArg()) 1229 return getUninstantiatedDefaultArg()->getSourceRange(); 1230 1231 return SourceRange(); 1232} 1233 1234bool ParmVarDecl::isParameterPack() const { 1235 return isa<PackExpansionType>(getType()); 1236} 1237 1238//===----------------------------------------------------------------------===// 1239// FunctionDecl Implementation 1240//===----------------------------------------------------------------------===// 1241 1242void FunctionDecl::getNameForDiagnostic(std::string &S, 1243 const PrintingPolicy &Policy, 1244 bool Qualified) const { 1245 NamedDecl::getNameForDiagnostic(S, Policy, Qualified); 1246 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs(); 1247 if (TemplateArgs) 1248 S += TemplateSpecializationType::PrintTemplateArgumentList( 1249 TemplateArgs->data(), 1250 TemplateArgs->size(), 1251 Policy); 1252 1253} 1254 1255bool FunctionDecl::isVariadic() const { 1256 if (const FunctionProtoType *FT = getType()->getAs<FunctionProtoType>()) 1257 return FT->isVariadic(); 1258 return false; 1259} 1260 1261bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const { 1262 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1263 if (I->Body) { 1264 Definition = *I; 1265 return true; 1266 } 1267 } 1268 1269 return false; 1270} 1271 1272Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const { 1273 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1274 if (I->Body) { 1275 Definition = *I; 1276 return I->Body.get(getASTContext().getExternalSource()); 1277 } 1278 } 1279 1280 return 0; 1281} 1282 1283void FunctionDecl::setBody(Stmt *B) { 1284 Body = B; 1285 if (B) 1286 EndRangeLoc = B->getLocEnd(); 1287} 1288 1289void FunctionDecl::setPure(bool P) { 1290 IsPure = P; 1291 if (P) 1292 if (CXXRecordDecl *Parent = dyn_cast<CXXRecordDecl>(getDeclContext())) 1293 Parent->markedVirtualFunctionPure(); 1294} 1295 1296bool FunctionDecl::isMain() const { 1297 ASTContext &Context = getASTContext(); 1298 return !Context.getLangOptions().Freestanding && 1299 getDeclContext()->getRedeclContext()->isTranslationUnit() && 1300 getIdentifier() && getIdentifier()->isStr("main"); 1301} 1302 1303bool FunctionDecl::isExternC() const { 1304 ASTContext &Context = getASTContext(); 1305 // In C, any non-static, non-overloadable function has external 1306 // linkage. 1307 if (!Context.getLangOptions().CPlusPlus) 1308 return getStorageClass() != SC_Static && !getAttr<OverloadableAttr>(); 1309 1310 for (const DeclContext *DC = getDeclContext(); !DC->isTranslationUnit(); 1311 DC = DC->getParent()) { 1312 if (const LinkageSpecDecl *Linkage = dyn_cast<LinkageSpecDecl>(DC)) { 1313 if (Linkage->getLanguage() == LinkageSpecDecl::lang_c) 1314 return getStorageClass() != SC_Static && 1315 !getAttr<OverloadableAttr>(); 1316 1317 break; 1318 } 1319 1320 if (DC->isRecord()) 1321 break; 1322 } 1323 1324 return isMain(); 1325} 1326 1327bool FunctionDecl::isGlobal() const { 1328 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(this)) 1329 return Method->isStatic(); 1330 1331 if (getStorageClass() == SC_Static) 1332 return false; 1333 1334 for (const DeclContext *DC = getDeclContext(); 1335 DC->isNamespace(); 1336 DC = DC->getParent()) { 1337 if (const NamespaceDecl *Namespace = cast<NamespaceDecl>(DC)) { 1338 if (!Namespace->getDeclName()) 1339 return false; 1340 break; 1341 } 1342 } 1343 1344 return true; 1345} 1346 1347void 1348FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) { 1349 redeclarable_base::setPreviousDeclaration(PrevDecl); 1350 1351 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) { 1352 FunctionTemplateDecl *PrevFunTmpl 1353 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : 0; 1354 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch"); 1355 FunTmpl->setPreviousDeclaration(PrevFunTmpl); 1356 } 1357 1358 if (PrevDecl->IsInline) 1359 IsInline = true; 1360} 1361 1362const FunctionDecl *FunctionDecl::getCanonicalDecl() const { 1363 return getFirstDeclaration(); 1364} 1365 1366FunctionDecl *FunctionDecl::getCanonicalDecl() { 1367 return getFirstDeclaration(); 1368} 1369 1370void FunctionDecl::setStorageClass(StorageClass SC) { 1371 assert(isLegalForFunction(SC)); 1372 if (getStorageClass() != SC) 1373 ClearLinkageCache(); 1374 1375 SClass = SC; 1376} 1377 1378/// \brief Returns a value indicating whether this function 1379/// corresponds to a builtin function. 1380/// 1381/// The function corresponds to a built-in function if it is 1382/// declared at translation scope or within an extern "C" block and 1383/// its name matches with the name of a builtin. The returned value 1384/// will be 0 for functions that do not correspond to a builtin, a 1385/// value of type \c Builtin::ID if in the target-independent range 1386/// \c [1,Builtin::First), or a target-specific builtin value. 1387unsigned FunctionDecl::getBuiltinID() const { 1388 ASTContext &Context = getASTContext(); 1389 if (!getIdentifier() || !getIdentifier()->getBuiltinID()) 1390 return 0; 1391 1392 unsigned BuiltinID = getIdentifier()->getBuiltinID(); 1393 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) 1394 return BuiltinID; 1395 1396 // This function has the name of a known C library 1397 // function. Determine whether it actually refers to the C library 1398 // function or whether it just has the same name. 1399 1400 // If this is a static function, it's not a builtin. 1401 if (getStorageClass() == SC_Static) 1402 return 0; 1403 1404 // If this function is at translation-unit scope and we're not in 1405 // C++, it refers to the C library function. 1406 if (!Context.getLangOptions().CPlusPlus && 1407 getDeclContext()->isTranslationUnit()) 1408 return BuiltinID; 1409 1410 // If the function is in an extern "C" linkage specification and is 1411 // not marked "overloadable", it's the real function. 1412 if (isa<LinkageSpecDecl>(getDeclContext()) && 1413 cast<LinkageSpecDecl>(getDeclContext())->getLanguage() 1414 == LinkageSpecDecl::lang_c && 1415 !getAttr<OverloadableAttr>()) 1416 return BuiltinID; 1417 1418 // Not a builtin 1419 return 0; 1420} 1421 1422 1423/// getNumParams - Return the number of parameters this function must have 1424/// based on its FunctionType. This is the length of the ParamInfo array 1425/// after it has been created. 1426unsigned FunctionDecl::getNumParams() const { 1427 const FunctionType *FT = getType()->getAs<FunctionType>(); 1428 if (isa<FunctionNoProtoType>(FT)) 1429 return 0; 1430 return cast<FunctionProtoType>(FT)->getNumArgs(); 1431 1432} 1433 1434void FunctionDecl::setParams(ASTContext &C, 1435 ParmVarDecl **NewParamInfo, unsigned NumParams) { 1436 assert(ParamInfo == 0 && "Already has param info!"); 1437 assert(NumParams == getNumParams() && "Parameter count mismatch!"); 1438 1439 // Zero params -> null pointer. 1440 if (NumParams) { 1441 void *Mem = C.Allocate(sizeof(ParmVarDecl*)*NumParams); 1442 ParamInfo = new (Mem) ParmVarDecl*[NumParams]; 1443 memcpy(ParamInfo, NewParamInfo, sizeof(ParmVarDecl*)*NumParams); 1444 1445 // Update source range. The check below allows us to set EndRangeLoc before 1446 // setting the parameters. 1447 if (EndRangeLoc.isInvalid() || EndRangeLoc == getLocation()) 1448 EndRangeLoc = NewParamInfo[NumParams-1]->getLocEnd(); 1449 } 1450} 1451 1452/// getMinRequiredArguments - Returns the minimum number of arguments 1453/// needed to call this function. This may be fewer than the number of 1454/// function parameters, if some of the parameters have default 1455/// arguments (in C++) or the last parameter is a parameter pack. 1456unsigned FunctionDecl::getMinRequiredArguments() const { 1457 if (!getASTContext().getLangOptions().CPlusPlus) 1458 return getNumParams(); 1459 1460 unsigned NumRequiredArgs = getNumParams(); 1461 1462 // If the last parameter is a parameter pack, we don't need an argument for 1463 // it. 1464 if (NumRequiredArgs > 0 && 1465 getParamDecl(NumRequiredArgs - 1)->isParameterPack()) 1466 --NumRequiredArgs; 1467 1468 // If this parameter has a default argument, we don't need an argument for 1469 // it. 1470 while (NumRequiredArgs > 0 && 1471 getParamDecl(NumRequiredArgs-1)->hasDefaultArg()) 1472 --NumRequiredArgs; 1473 1474 // We might have parameter packs before the end. These can't be deduced, 1475 // but they can still handle multiple arguments. 1476 unsigned ArgIdx = NumRequiredArgs; 1477 while (ArgIdx > 0) { 1478 if (getParamDecl(ArgIdx - 1)->isParameterPack()) 1479 NumRequiredArgs = ArgIdx; 1480 1481 --ArgIdx; 1482 } 1483 1484 return NumRequiredArgs; 1485} 1486 1487bool FunctionDecl::isInlined() const { 1488 if (IsInline) 1489 return true; 1490 1491 if (isa<CXXMethodDecl>(this)) { 1492 if (!isOutOfLine() || getCanonicalDecl()->isInlineSpecified()) 1493 return true; 1494 } 1495 1496 switch (getTemplateSpecializationKind()) { 1497 case TSK_Undeclared: 1498 case TSK_ExplicitSpecialization: 1499 return false; 1500 1501 case TSK_ImplicitInstantiation: 1502 case TSK_ExplicitInstantiationDeclaration: 1503 case TSK_ExplicitInstantiationDefinition: 1504 // Handle below. 1505 break; 1506 } 1507 1508 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern(); 1509 bool HasPattern = false; 1510 if (PatternDecl) 1511 HasPattern = PatternDecl->hasBody(PatternDecl); 1512 1513 if (HasPattern && PatternDecl) 1514 return PatternDecl->isInlined(); 1515 1516 return false; 1517} 1518 1519/// \brief For an inline function definition in C or C++, determine whether the 1520/// definition will be externally visible. 1521/// 1522/// Inline function definitions are always available for inlining optimizations. 1523/// However, depending on the language dialect, declaration specifiers, and 1524/// attributes, the definition of an inline function may or may not be 1525/// "externally" visible to other translation units in the program. 1526/// 1527/// In C99, inline definitions are not externally visible by default. However, 1528/// if even one of the global-scope declarations is marked "extern inline", the 1529/// inline definition becomes externally visible (C99 6.7.4p6). 1530/// 1531/// In GNU89 mode, or if the gnu_inline attribute is attached to the function 1532/// definition, we use the GNU semantics for inline, which are nearly the 1533/// opposite of C99 semantics. In particular, "inline" by itself will create 1534/// an externally visible symbol, but "extern inline" will not create an 1535/// externally visible symbol. 1536bool FunctionDecl::isInlineDefinitionExternallyVisible() const { 1537 assert(isThisDeclarationADefinition() && "Must have the function definition"); 1538 assert(isInlined() && "Function must be inline"); 1539 ASTContext &Context = getASTContext(); 1540 1541 if (!Context.getLangOptions().C99 || hasAttr<GNUInlineAttr>()) { 1542 // If it's not the case that both 'inline' and 'extern' are 1543 // specified on the definition, then this inline definition is 1544 // externally visible. 1545 if (!(isInlineSpecified() && getStorageClassAsWritten() == SC_Extern)) 1546 return true; 1547 1548 // If any declaration is 'inline' but not 'extern', then this definition 1549 // is externally visible. 1550 for (redecl_iterator Redecl = redecls_begin(), RedeclEnd = redecls_end(); 1551 Redecl != RedeclEnd; 1552 ++Redecl) { 1553 if (Redecl->isInlineSpecified() && 1554 Redecl->getStorageClassAsWritten() != SC_Extern) 1555 return true; 1556 } 1557 1558 return false; 1559 } 1560 1561 // C99 6.7.4p6: 1562 // [...] If all of the file scope declarations for a function in a 1563 // translation unit include the inline function specifier without extern, 1564 // then the definition in that translation unit is an inline definition. 1565 for (redecl_iterator Redecl = redecls_begin(), RedeclEnd = redecls_end(); 1566 Redecl != RedeclEnd; 1567 ++Redecl) { 1568 // Only consider file-scope declarations in this test. 1569 if (!Redecl->getLexicalDeclContext()->isTranslationUnit()) 1570 continue; 1571 1572 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern) 1573 return true; // Not an inline definition 1574 } 1575 1576 // C99 6.7.4p6: 1577 // An inline definition does not provide an external definition for the 1578 // function, and does not forbid an external definition in another 1579 // translation unit. 1580 return false; 1581} 1582 1583/// getOverloadedOperator - Which C++ overloaded operator this 1584/// function represents, if any. 1585OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const { 1586 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName) 1587 return getDeclName().getCXXOverloadedOperator(); 1588 else 1589 return OO_None; 1590} 1591 1592/// getLiteralIdentifier - The literal suffix identifier this function 1593/// represents, if any. 1594const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const { 1595 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName) 1596 return getDeclName().getCXXLiteralIdentifier(); 1597 else 1598 return 0; 1599} 1600 1601FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const { 1602 if (TemplateOrSpecialization.isNull()) 1603 return TK_NonTemplate; 1604 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>()) 1605 return TK_FunctionTemplate; 1606 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>()) 1607 return TK_MemberSpecialization; 1608 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>()) 1609 return TK_FunctionTemplateSpecialization; 1610 if (TemplateOrSpecialization.is 1611 <DependentFunctionTemplateSpecializationInfo*>()) 1612 return TK_DependentFunctionTemplateSpecialization; 1613 1614 assert(false && "Did we miss a TemplateOrSpecialization type?"); 1615 return TK_NonTemplate; 1616} 1617 1618FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const { 1619 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo()) 1620 return cast<FunctionDecl>(Info->getInstantiatedFrom()); 1621 1622 return 0; 1623} 1624 1625MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const { 1626 return TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>(); 1627} 1628 1629void 1630FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C, 1631 FunctionDecl *FD, 1632 TemplateSpecializationKind TSK) { 1633 assert(TemplateOrSpecialization.isNull() && 1634 "Member function is already a specialization"); 1635 MemberSpecializationInfo *Info 1636 = new (C) MemberSpecializationInfo(FD, TSK); 1637 TemplateOrSpecialization = Info; 1638} 1639 1640bool FunctionDecl::isImplicitlyInstantiable() const { 1641 // If the function is invalid, it can't be implicitly instantiated. 1642 if (isInvalidDecl()) 1643 return false; 1644 1645 switch (getTemplateSpecializationKind()) { 1646 case TSK_Undeclared: 1647 case TSK_ExplicitSpecialization: 1648 case TSK_ExplicitInstantiationDefinition: 1649 return false; 1650 1651 case TSK_ImplicitInstantiation: 1652 return true; 1653 1654 case TSK_ExplicitInstantiationDeclaration: 1655 // Handled below. 1656 break; 1657 } 1658 1659 // Find the actual template from which we will instantiate. 1660 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern(); 1661 bool HasPattern = false; 1662 if (PatternDecl) 1663 HasPattern = PatternDecl->hasBody(PatternDecl); 1664 1665 // C++0x [temp.explicit]p9: 1666 // Except for inline functions, other explicit instantiation declarations 1667 // have the effect of suppressing the implicit instantiation of the entity 1668 // to which they refer. 1669 if (!HasPattern || !PatternDecl) 1670 return true; 1671 1672 return PatternDecl->isInlined(); 1673} 1674 1675FunctionDecl *FunctionDecl::getTemplateInstantiationPattern() const { 1676 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) { 1677 while (Primary->getInstantiatedFromMemberTemplate()) { 1678 // If we have hit a point where the user provided a specialization of 1679 // this template, we're done looking. 1680 if (Primary->isMemberSpecialization()) 1681 break; 1682 1683 Primary = Primary->getInstantiatedFromMemberTemplate(); 1684 } 1685 1686 return Primary->getTemplatedDecl(); 1687 } 1688 1689 return getInstantiatedFromMemberFunction(); 1690} 1691 1692FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const { 1693 if (FunctionTemplateSpecializationInfo *Info 1694 = TemplateOrSpecialization 1695 .dyn_cast<FunctionTemplateSpecializationInfo*>()) { 1696 return Info->Template.getPointer(); 1697 } 1698 return 0; 1699} 1700 1701const TemplateArgumentList * 1702FunctionDecl::getTemplateSpecializationArgs() const { 1703 if (FunctionTemplateSpecializationInfo *Info 1704 = TemplateOrSpecialization 1705 .dyn_cast<FunctionTemplateSpecializationInfo*>()) { 1706 return Info->TemplateArguments; 1707 } 1708 return 0; 1709} 1710 1711const TemplateArgumentListInfo * 1712FunctionDecl::getTemplateSpecializationArgsAsWritten() const { 1713 if (FunctionTemplateSpecializationInfo *Info 1714 = TemplateOrSpecialization 1715 .dyn_cast<FunctionTemplateSpecializationInfo*>()) { 1716 return Info->TemplateArgumentsAsWritten; 1717 } 1718 return 0; 1719} 1720 1721void 1722FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C, 1723 FunctionTemplateDecl *Template, 1724 const TemplateArgumentList *TemplateArgs, 1725 void *InsertPos, 1726 TemplateSpecializationKind TSK, 1727 const TemplateArgumentListInfo *TemplateArgsAsWritten, 1728 SourceLocation PointOfInstantiation) { 1729 assert(TSK != TSK_Undeclared && 1730 "Must specify the type of function template specialization"); 1731 FunctionTemplateSpecializationInfo *Info 1732 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>(); 1733 if (!Info) 1734 Info = FunctionTemplateSpecializationInfo::Create(C, this, Template, TSK, 1735 TemplateArgs, 1736 TemplateArgsAsWritten, 1737 PointOfInstantiation); 1738 TemplateOrSpecialization = Info; 1739 1740 // Insert this function template specialization into the set of known 1741 // function template specializations. 1742 if (InsertPos) 1743 Template->getSpecializations().InsertNode(Info, InsertPos); 1744 else { 1745 // Try to insert the new node. If there is an existing node, leave it, the 1746 // set will contain the canonical decls while 1747 // FunctionTemplateDecl::findSpecialization will return 1748 // the most recent redeclarations. 1749 FunctionTemplateSpecializationInfo *Existing 1750 = Template->getSpecializations().GetOrInsertNode(Info); 1751 (void)Existing; 1752 assert((!Existing || Existing->Function->isCanonicalDecl()) && 1753 "Set is supposed to only contain canonical decls"); 1754 } 1755} 1756 1757void 1758FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context, 1759 const UnresolvedSetImpl &Templates, 1760 const TemplateArgumentListInfo &TemplateArgs) { 1761 assert(TemplateOrSpecialization.isNull()); 1762 size_t Size = sizeof(DependentFunctionTemplateSpecializationInfo); 1763 Size += Templates.size() * sizeof(FunctionTemplateDecl*); 1764 Size += TemplateArgs.size() * sizeof(TemplateArgumentLoc); 1765 void *Buffer = Context.Allocate(Size); 1766 DependentFunctionTemplateSpecializationInfo *Info = 1767 new (Buffer) DependentFunctionTemplateSpecializationInfo(Templates, 1768 TemplateArgs); 1769 TemplateOrSpecialization = Info; 1770} 1771 1772DependentFunctionTemplateSpecializationInfo:: 1773DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts, 1774 const TemplateArgumentListInfo &TArgs) 1775 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) { 1776 1777 d.NumTemplates = Ts.size(); 1778 d.NumArgs = TArgs.size(); 1779 1780 FunctionTemplateDecl **TsArray = 1781 const_cast<FunctionTemplateDecl**>(getTemplates()); 1782 for (unsigned I = 0, E = Ts.size(); I != E; ++I) 1783 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl()); 1784 1785 TemplateArgumentLoc *ArgsArray = 1786 const_cast<TemplateArgumentLoc*>(getTemplateArgs()); 1787 for (unsigned I = 0, E = TArgs.size(); I != E; ++I) 1788 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]); 1789} 1790 1791TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const { 1792 // For a function template specialization, query the specialization 1793 // information object. 1794 FunctionTemplateSpecializationInfo *FTSInfo 1795 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>(); 1796 if (FTSInfo) 1797 return FTSInfo->getTemplateSpecializationKind(); 1798 1799 MemberSpecializationInfo *MSInfo 1800 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>(); 1801 if (MSInfo) 1802 return MSInfo->getTemplateSpecializationKind(); 1803 1804 return TSK_Undeclared; 1805} 1806 1807void 1808FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK, 1809 SourceLocation PointOfInstantiation) { 1810 if (FunctionTemplateSpecializationInfo *FTSInfo 1811 = TemplateOrSpecialization.dyn_cast< 1812 FunctionTemplateSpecializationInfo*>()) { 1813 FTSInfo->setTemplateSpecializationKind(TSK); 1814 if (TSK != TSK_ExplicitSpecialization && 1815 PointOfInstantiation.isValid() && 1816 FTSInfo->getPointOfInstantiation().isInvalid()) 1817 FTSInfo->setPointOfInstantiation(PointOfInstantiation); 1818 } else if (MemberSpecializationInfo *MSInfo 1819 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) { 1820 MSInfo->setTemplateSpecializationKind(TSK); 1821 if (TSK != TSK_ExplicitSpecialization && 1822 PointOfInstantiation.isValid() && 1823 MSInfo->getPointOfInstantiation().isInvalid()) 1824 MSInfo->setPointOfInstantiation(PointOfInstantiation); 1825 } else 1826 assert(false && "Function cannot have a template specialization kind"); 1827} 1828 1829SourceLocation FunctionDecl::getPointOfInstantiation() const { 1830 if (FunctionTemplateSpecializationInfo *FTSInfo 1831 = TemplateOrSpecialization.dyn_cast< 1832 FunctionTemplateSpecializationInfo*>()) 1833 return FTSInfo->getPointOfInstantiation(); 1834 else if (MemberSpecializationInfo *MSInfo 1835 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) 1836 return MSInfo->getPointOfInstantiation(); 1837 1838 return SourceLocation(); 1839} 1840 1841bool FunctionDecl::isOutOfLine() const { 1842 if (Decl::isOutOfLine()) 1843 return true; 1844 1845 // If this function was instantiated from a member function of a 1846 // class template, check whether that member function was defined out-of-line. 1847 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) { 1848 const FunctionDecl *Definition; 1849 if (FD->hasBody(Definition)) 1850 return Definition->isOutOfLine(); 1851 } 1852 1853 // If this function was instantiated from a function template, 1854 // check whether that function template was defined out-of-line. 1855 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) { 1856 const FunctionDecl *Definition; 1857 if (FunTmpl->getTemplatedDecl()->hasBody(Definition)) 1858 return Definition->isOutOfLine(); 1859 } 1860 1861 return false; 1862} 1863 1864//===----------------------------------------------------------------------===// 1865// FieldDecl Implementation 1866//===----------------------------------------------------------------------===// 1867 1868FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC, 1869 SourceLocation L, IdentifierInfo *Id, QualType T, 1870 TypeSourceInfo *TInfo, Expr *BW, bool Mutable) { 1871 return new (C) FieldDecl(Decl::Field, DC, L, Id, T, TInfo, BW, Mutable); 1872} 1873 1874bool FieldDecl::isAnonymousStructOrUnion() const { 1875 if (!isImplicit() || getDeclName()) 1876 return false; 1877 1878 if (const RecordType *Record = getType()->getAs<RecordType>()) 1879 return Record->getDecl()->isAnonymousStructOrUnion(); 1880 1881 return false; 1882} 1883 1884unsigned FieldDecl::getFieldIndex() const { 1885 if (CachedFieldIndex) return CachedFieldIndex - 1; 1886 1887 unsigned index = 0; 1888 RecordDecl::field_iterator 1889 i = getParent()->field_begin(), e = getParent()->field_end(); 1890 while (true) { 1891 assert(i != e && "failed to find field in parent!"); 1892 if (*i == this) 1893 break; 1894 1895 ++i; 1896 ++index; 1897 } 1898 1899 CachedFieldIndex = index + 1; 1900 return index; 1901} 1902 1903//===----------------------------------------------------------------------===// 1904// TagDecl Implementation 1905//===----------------------------------------------------------------------===// 1906 1907SourceLocation TagDecl::getOuterLocStart() const { 1908 return getTemplateOrInnerLocStart(this); 1909} 1910 1911SourceRange TagDecl::getSourceRange() const { 1912 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation(); 1913 return SourceRange(getOuterLocStart(), E); 1914} 1915 1916TagDecl* TagDecl::getCanonicalDecl() { 1917 return getFirstDeclaration(); 1918} 1919 1920void TagDecl::setTypedefForAnonDecl(TypedefDecl *TDD) { 1921 TypedefDeclOrQualifier = TDD; 1922 if (TypeForDecl) 1923 const_cast<Type*>(TypeForDecl)->ClearLinkageCache(); 1924 ClearLinkageCache(); 1925} 1926 1927void TagDecl::startDefinition() { 1928 IsBeingDefined = true; 1929 1930 if (isa<CXXRecordDecl>(this)) { 1931 CXXRecordDecl *D = cast<CXXRecordDecl>(this); 1932 struct CXXRecordDecl::DefinitionData *Data = 1933 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D); 1934 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) 1935 cast<CXXRecordDecl>(*I)->DefinitionData = Data; 1936 } 1937} 1938 1939void TagDecl::completeDefinition() { 1940 assert((!isa<CXXRecordDecl>(this) || 1941 cast<CXXRecordDecl>(this)->hasDefinition()) && 1942 "definition completed but not started"); 1943 1944 IsDefinition = true; 1945 IsBeingDefined = false; 1946 1947 if (ASTMutationListener *L = getASTMutationListener()) 1948 L->CompletedTagDefinition(this); 1949} 1950 1951TagDecl* TagDecl::getDefinition() const { 1952 if (isDefinition()) 1953 return const_cast<TagDecl *>(this); 1954 if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(this)) 1955 return CXXRD->getDefinition(); 1956 1957 for (redecl_iterator R = redecls_begin(), REnd = redecls_end(); 1958 R != REnd; ++R) 1959 if (R->isDefinition()) 1960 return *R; 1961 1962 return 0; 1963} 1964 1965void TagDecl::setQualifierInfo(NestedNameSpecifier *Qualifier, 1966 SourceRange QualifierRange) { 1967 if (Qualifier) { 1968 // Make sure the extended qualifier info is allocated. 1969 if (!hasExtInfo()) 1970 TypedefDeclOrQualifier = new (getASTContext()) ExtInfo; 1971 // Set qualifier info. 1972 getExtInfo()->NNS = Qualifier; 1973 getExtInfo()->NNSRange = QualifierRange; 1974 } 1975 else { 1976 // Here Qualifier == 0, i.e., we are removing the qualifier (if any). 1977 assert(QualifierRange.isInvalid()); 1978 if (hasExtInfo()) { 1979 getASTContext().Deallocate(getExtInfo()); 1980 TypedefDeclOrQualifier = (TypedefDecl*) 0; 1981 } 1982 } 1983} 1984 1985//===----------------------------------------------------------------------===// 1986// EnumDecl Implementation 1987//===----------------------------------------------------------------------===// 1988 1989EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L, 1990 IdentifierInfo *Id, SourceLocation TKL, 1991 EnumDecl *PrevDecl, bool IsScoped, 1992 bool IsScopedUsingClassTag, bool IsFixed) { 1993 EnumDecl *Enum = new (C) EnumDecl(DC, L, Id, PrevDecl, TKL, 1994 IsScoped, IsScopedUsingClassTag, IsFixed); 1995 C.getTypeDeclType(Enum, PrevDecl); 1996 return Enum; 1997} 1998 1999EnumDecl *EnumDecl::Create(ASTContext &C, EmptyShell Empty) { 2000 return new (C) EnumDecl(0, SourceLocation(), 0, 0, SourceLocation(), 2001 false, false, false); 2002} 2003 2004void EnumDecl::completeDefinition(QualType NewType, 2005 QualType NewPromotionType, 2006 unsigned NumPositiveBits, 2007 unsigned NumNegativeBits) { 2008 assert(!isDefinition() && "Cannot redefine enums!"); 2009 if (!IntegerType) 2010 IntegerType = NewType.getTypePtr(); 2011 PromotionType = NewPromotionType; 2012 setNumPositiveBits(NumPositiveBits); 2013 setNumNegativeBits(NumNegativeBits); 2014 TagDecl::completeDefinition(); 2015} 2016 2017//===----------------------------------------------------------------------===// 2018// RecordDecl Implementation 2019//===----------------------------------------------------------------------===// 2020 2021RecordDecl::RecordDecl(Kind DK, TagKind TK, DeclContext *DC, SourceLocation L, 2022 IdentifierInfo *Id, RecordDecl *PrevDecl, 2023 SourceLocation TKL) 2024 : TagDecl(DK, TK, DC, L, Id, PrevDecl, TKL) { 2025 HasFlexibleArrayMember = false; 2026 AnonymousStructOrUnion = false; 2027 HasObjectMember = false; 2028 LoadedFieldsFromExternalStorage = false; 2029 assert(classof(static_cast<Decl*>(this)) && "Invalid Kind!"); 2030} 2031 2032RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC, 2033 SourceLocation L, IdentifierInfo *Id, 2034 SourceLocation TKL, RecordDecl* PrevDecl) { 2035 2036 RecordDecl* R = new (C) RecordDecl(Record, TK, DC, L, Id, PrevDecl, TKL); 2037 C.getTypeDeclType(R, PrevDecl); 2038 return R; 2039} 2040 2041RecordDecl *RecordDecl::Create(const ASTContext &C, EmptyShell Empty) { 2042 return new (C) RecordDecl(Record, TTK_Struct, 0, SourceLocation(), 0, 0, 2043 SourceLocation()); 2044} 2045 2046bool RecordDecl::isInjectedClassName() const { 2047 return isImplicit() && getDeclName() && getDeclContext()->isRecord() && 2048 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName(); 2049} 2050 2051RecordDecl::field_iterator RecordDecl::field_begin() const { 2052 if (hasExternalLexicalStorage() && !LoadedFieldsFromExternalStorage) 2053 LoadFieldsFromExternalStorage(); 2054 2055 return field_iterator(decl_iterator(FirstDecl)); 2056} 2057 2058/// completeDefinition - Notes that the definition of this type is now 2059/// complete. 2060void RecordDecl::completeDefinition() { 2061 assert(!isDefinition() && "Cannot redefine record!"); 2062 TagDecl::completeDefinition(); 2063} 2064 2065void RecordDecl::LoadFieldsFromExternalStorage() const { 2066 ExternalASTSource *Source = getASTContext().getExternalSource(); 2067 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 2068 2069 // Notify that we have a RecordDecl doing some initialization. 2070 ExternalASTSource::Deserializing TheFields(Source); 2071 2072 llvm::SmallVector<Decl*, 64> Decls; 2073 if (Source->FindExternalLexicalDeclsBy<FieldDecl>(this, Decls)) 2074 return; 2075 2076#ifndef NDEBUG 2077 // Check that all decls we got were FieldDecls. 2078 for (unsigned i=0, e=Decls.size(); i != e; ++i) 2079 assert(isa<FieldDecl>(Decls[i])); 2080#endif 2081 2082 LoadedFieldsFromExternalStorage = true; 2083 2084 if (Decls.empty()) 2085 return; 2086 2087 llvm::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls); 2088} 2089 2090//===----------------------------------------------------------------------===// 2091// BlockDecl Implementation 2092//===----------------------------------------------------------------------===// 2093 2094void BlockDecl::setParams(ParmVarDecl **NewParamInfo, 2095 unsigned NParms) { 2096 assert(ParamInfo == 0 && "Already has param info!"); 2097 2098 // Zero params -> null pointer. 2099 if (NParms) { 2100 NumParams = NParms; 2101 void *Mem = getASTContext().Allocate(sizeof(ParmVarDecl*)*NumParams); 2102 ParamInfo = new (Mem) ParmVarDecl*[NumParams]; 2103 memcpy(ParamInfo, NewParamInfo, sizeof(ParmVarDecl*)*NumParams); 2104 } 2105} 2106 2107void BlockDecl::setCapturedDecls(ASTContext &Context, 2108 VarDecl * const *begin, 2109 VarDecl * const *end, 2110 bool capturesCXXThis) { 2111 CapturesCXXThis = capturesCXXThis; 2112 2113 if (begin == end) { 2114 NumCapturedDecls = 0; 2115 CapturedDecls = 0; 2116 return; 2117 } 2118 2119 NumCapturedDecls = end - begin; 2120 CapturedDecls = new (Context) VarDecl*[NumCapturedDecls]; 2121 memcpy(CapturedDecls, begin, NumCapturedDecls * sizeof(VarDecl*)); 2122} 2123 2124SourceRange BlockDecl::getSourceRange() const { 2125 return SourceRange(getLocation(), Body? Body->getLocEnd() : getLocation()); 2126} 2127 2128//===----------------------------------------------------------------------===// 2129// Other Decl Allocation/Deallocation Method Implementations 2130//===----------------------------------------------------------------------===// 2131 2132TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) { 2133 return new (C) TranslationUnitDecl(C); 2134} 2135 2136NamespaceDecl *NamespaceDecl::Create(ASTContext &C, DeclContext *DC, 2137 SourceLocation L, IdentifierInfo *Id) { 2138 return new (C) NamespaceDecl(DC, L, Id); 2139} 2140 2141NamespaceDecl *NamespaceDecl::getNextNamespace() { 2142 return dyn_cast_or_null<NamespaceDecl>( 2143 NextNamespace.get(getASTContext().getExternalSource())); 2144} 2145 2146ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC, 2147 SourceLocation L, IdentifierInfo *Id, QualType T) { 2148 return new (C) ImplicitParamDecl(ImplicitParam, DC, L, Id, T); 2149} 2150 2151FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC, 2152 const DeclarationNameInfo &NameInfo, 2153 QualType T, TypeSourceInfo *TInfo, 2154 StorageClass S, StorageClass SCAsWritten, 2155 bool isInlineSpecified, 2156 bool hasWrittenPrototype) { 2157 FunctionDecl *New = new (C) FunctionDecl(Function, DC, NameInfo, T, TInfo, 2158 S, SCAsWritten, isInlineSpecified); 2159 New->HasWrittenPrototype = hasWrittenPrototype; 2160 return New; 2161} 2162 2163BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) { 2164 return new (C) BlockDecl(DC, L); 2165} 2166 2167EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD, 2168 SourceLocation L, 2169 IdentifierInfo *Id, QualType T, 2170 Expr *E, const llvm::APSInt &V) { 2171 return new (C) EnumConstantDecl(CD, L, Id, T, E, V); 2172} 2173 2174IndirectFieldDecl * 2175IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L, 2176 IdentifierInfo *Id, QualType T, NamedDecl **CH, 2177 unsigned CHS) { 2178 return new (C) IndirectFieldDecl(DC, L, Id, T, CH, CHS); 2179} 2180 2181SourceRange EnumConstantDecl::getSourceRange() const { 2182 SourceLocation End = getLocation(); 2183 if (Init) 2184 End = Init->getLocEnd(); 2185 return SourceRange(getLocation(), End); 2186} 2187 2188TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC, 2189 SourceLocation L, IdentifierInfo *Id, 2190 TypeSourceInfo *TInfo) { 2191 return new (C) TypedefDecl(DC, L, Id, TInfo); 2192} 2193 2194FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC, 2195 SourceLocation L, 2196 StringLiteral *Str) { 2197 return new (C) FileScopeAsmDecl(DC, L, Str); 2198} 2199