Decl.cpp revision 6784304db526cde59046d613c4175ce2caf93e44
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 bool ConsiderTemplateParameterTypes; 104 105 LVFlags() : ConsiderGlobalVisibility(true), 106 ConsiderVisibilityAttributes(true), 107 ConsiderTemplateParameterTypes(true) { 108 } 109 110 /// \brief Returns a set of flags that is only useful for computing the 111 /// linkage, not the visibility, of a declaration. 112 static LVFlags CreateOnlyDeclLinkage() { 113 LVFlags F; 114 F.ConsiderGlobalVisibility = false; 115 F.ConsiderVisibilityAttributes = false; 116 F.ConsiderTemplateParameterTypes = false; 117 return F; 118 } 119 120 /// Returns a set of flags, otherwise based on these, which ignores 121 /// off all sources of visibility except template arguments. 122 LVFlags onlyTemplateVisibility() const { 123 LVFlags F = *this; 124 F.ConsiderGlobalVisibility = false; 125 F.ConsiderVisibilityAttributes = false; 126 F.ConsiderTemplateParameterTypes = false; 127 return F; 128 } 129}; 130} // end anonymous namespace 131 132/// \brief Get the most restrictive linkage for the types in the given 133/// template parameter list. 134static LVPair 135getLVForTemplateParameterList(const TemplateParameterList *Params) { 136 LVPair LV(ExternalLinkage, DefaultVisibility); 137 for (TemplateParameterList::const_iterator P = Params->begin(), 138 PEnd = Params->end(); 139 P != PEnd; ++P) { 140 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(*P)) { 141 if (NTTP->isExpandedParameterPack()) { 142 for (unsigned I = 0, N = NTTP->getNumExpansionTypes(); I != N; ++I) { 143 QualType T = NTTP->getExpansionType(I); 144 if (!T->isDependentType()) 145 LV = merge(LV, T->getLinkageAndVisibility()); 146 } 147 continue; 148 } 149 150 if (!NTTP->getType()->isDependentType()) { 151 LV = merge(LV, NTTP->getType()->getLinkageAndVisibility()); 152 continue; 153 } 154 } 155 156 if (TemplateTemplateParmDecl *TTP 157 = dyn_cast<TemplateTemplateParmDecl>(*P)) { 158 LV = merge(LV, getLVForTemplateParameterList(TTP->getTemplateParameters())); 159 } 160 } 161 162 return LV; 163} 164 165/// getLVForDecl - Get the linkage and visibility for the given declaration. 166static LinkageInfo getLVForDecl(const NamedDecl *D, LVFlags F); 167 168/// \brief Get the most restrictive linkage for the types and 169/// declarations in the given template argument list. 170static LVPair getLVForTemplateArgumentList(const TemplateArgument *Args, 171 unsigned NumArgs, 172 LVFlags &F) { 173 LVPair LV(ExternalLinkage, DefaultVisibility); 174 175 for (unsigned I = 0; I != NumArgs; ++I) { 176 switch (Args[I].getKind()) { 177 case TemplateArgument::Null: 178 case TemplateArgument::Integral: 179 case TemplateArgument::Expression: 180 break; 181 182 case TemplateArgument::Type: 183 LV = merge(LV, Args[I].getAsType()->getLinkageAndVisibility()); 184 break; 185 186 case TemplateArgument::Declaration: 187 // The decl can validly be null as the representation of nullptr 188 // arguments, valid only in C++0x. 189 if (Decl *D = Args[I].getAsDecl()) { 190 if (NamedDecl *ND = dyn_cast<NamedDecl>(D)) 191 LV = merge(LV, getLVForDecl(ND, F)); 192 } 193 break; 194 195 case TemplateArgument::Template: 196 case TemplateArgument::TemplateExpansion: 197 if (TemplateDecl *Template 198 = Args[I].getAsTemplateOrTemplatePattern().getAsTemplateDecl()) 199 LV = merge(LV, getLVForDecl(Template, F)); 200 break; 201 202 case TemplateArgument::Pack: 203 LV = merge(LV, getLVForTemplateArgumentList(Args[I].pack_begin(), 204 Args[I].pack_size(), 205 F)); 206 break; 207 } 208 } 209 210 return LV; 211} 212 213static LVPair 214getLVForTemplateArgumentList(const TemplateArgumentList &TArgs, 215 LVFlags &F) { 216 return getLVForTemplateArgumentList(TArgs.data(), TArgs.size(), F); 217} 218 219static LinkageInfo getLVForNamespaceScopeDecl(const NamedDecl *D, LVFlags F) { 220 assert(D->getDeclContext()->getRedeclContext()->isFileContext() && 221 "Not a name having namespace scope"); 222 ASTContext &Context = D->getASTContext(); 223 224 // C++ [basic.link]p3: 225 // A name having namespace scope (3.3.6) has internal linkage if it 226 // is the name of 227 // - an object, reference, function or function template that is 228 // explicitly declared static; or, 229 // (This bullet corresponds to C99 6.2.2p3.) 230 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 231 // Explicitly declared static. 232 if (Var->getStorageClass() == SC_Static) 233 return LinkageInfo::internal(); 234 235 // - an object or reference that is explicitly declared const 236 // and neither explicitly declared extern nor previously 237 // declared to have external linkage; or 238 // (there is no equivalent in C99) 239 if (Context.getLangOptions().CPlusPlus && 240 Var->getType().isConstant(Context) && 241 Var->getStorageClass() != SC_Extern && 242 Var->getStorageClass() != SC_PrivateExtern) { 243 bool FoundExtern = false; 244 for (const VarDecl *PrevVar = Var->getPreviousDeclaration(); 245 PrevVar && !FoundExtern; 246 PrevVar = PrevVar->getPreviousDeclaration()) 247 if (isExternalLinkage(PrevVar->getLinkage())) 248 FoundExtern = true; 249 250 if (!FoundExtern) 251 return LinkageInfo::internal(); 252 } 253 } else if (isa<FunctionDecl>(D) || isa<FunctionTemplateDecl>(D)) { 254 // C++ [temp]p4: 255 // A non-member function template can have internal linkage; any 256 // other template name shall have external linkage. 257 const FunctionDecl *Function = 0; 258 if (const FunctionTemplateDecl *FunTmpl 259 = dyn_cast<FunctionTemplateDecl>(D)) 260 Function = FunTmpl->getTemplatedDecl(); 261 else 262 Function = cast<FunctionDecl>(D); 263 264 // Explicitly declared static. 265 if (Function->getStorageClass() == SC_Static) 266 return LinkageInfo(InternalLinkage, DefaultVisibility, false); 267 } else if (const FieldDecl *Field = dyn_cast<FieldDecl>(D)) { 268 // - a data member of an anonymous union. 269 if (cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion()) 270 return LinkageInfo::internal(); 271 } 272 273 if (D->isInAnonymousNamespace()) { 274 const VarDecl *Var = dyn_cast<VarDecl>(D); 275 const FunctionDecl *Func = dyn_cast<FunctionDecl>(D); 276 if ((!Var || !Var->isExternC()) && (!Func || !Func->isExternC())) 277 return LinkageInfo::uniqueExternal(); 278 } 279 280 // Set up the defaults. 281 282 // C99 6.2.2p5: 283 // If the declaration of an identifier for an object has file 284 // scope and no storage-class specifier, its linkage is 285 // external. 286 LinkageInfo LV; 287 288 if (F.ConsiderVisibilityAttributes) { 289 if (const VisibilityAttr *VA = GetExplicitVisibility(D)) { 290 LV.setVisibility(GetVisibilityFromAttr(VA), true); 291 F.ConsiderGlobalVisibility = false; 292 } else { 293 // If we're declared in a namespace with a visibility attribute, 294 // use that namespace's visibility, but don't call it explicit. 295 for (const DeclContext *DC = D->getDeclContext(); 296 !isa<TranslationUnitDecl>(DC); 297 DC = DC->getParent()) { 298 if (!isa<NamespaceDecl>(DC)) continue; 299 if (const VisibilityAttr *VA = 300 cast<NamespaceDecl>(DC)->getAttr<VisibilityAttr>()) { 301 LV.setVisibility(GetVisibilityFromAttr(VA), false); 302 F.ConsiderGlobalVisibility = false; 303 break; 304 } 305 } 306 } 307 } 308 309 // C++ [basic.link]p4: 310 311 // A name having namespace scope has external linkage if it is the 312 // name of 313 // 314 // - an object or reference, unless it has internal linkage; or 315 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) { 316 // GCC applies the following optimization to variables and static 317 // data members, but not to functions: 318 // 319 // Modify the variable's LV by the LV of its type unless this is 320 // C or extern "C". This follows from [basic.link]p9: 321 // A type without linkage shall not be used as the type of a 322 // variable or function with external linkage unless 323 // - the entity has C language linkage, or 324 // - the entity is declared within an unnamed namespace, or 325 // - the entity is not used or is defined in the same 326 // translation unit. 327 // and [basic.link]p10: 328 // ...the types specified by all declarations referring to a 329 // given variable or function shall be identical... 330 // C does not have an equivalent rule. 331 // 332 // Ignore this if we've got an explicit attribute; the user 333 // probably knows what they're doing. 334 // 335 // Note that we don't want to make the variable non-external 336 // because of this, but unique-external linkage suits us. 337 if (Context.getLangOptions().CPlusPlus && !Var->isExternC()) { 338 LVPair TypeLV = Var->getType()->getLinkageAndVisibility(); 339 if (TypeLV.first != ExternalLinkage) 340 return LinkageInfo::uniqueExternal(); 341 if (!LV.visibilityExplicit()) 342 LV.mergeVisibility(TypeLV.second); 343 } 344 345 if (Var->getStorageClass() == SC_PrivateExtern) 346 LV.setVisibility(HiddenVisibility, true); 347 348 if (!Context.getLangOptions().CPlusPlus && 349 (Var->getStorageClass() == SC_Extern || 350 Var->getStorageClass() == SC_PrivateExtern)) { 351 352 // C99 6.2.2p4: 353 // For an identifier declared with the storage-class specifier 354 // extern in a scope in which a prior declaration of that 355 // identifier is visible, if the prior declaration specifies 356 // internal or external linkage, the linkage of the identifier 357 // at the later declaration is the same as the linkage 358 // specified at the prior declaration. If no prior declaration 359 // is visible, or if the prior declaration specifies no 360 // linkage, then the identifier has external linkage. 361 if (const VarDecl *PrevVar = Var->getPreviousDeclaration()) { 362 LinkageInfo PrevLV = getLVForDecl(PrevVar, F); 363 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 364 LV.mergeVisibility(PrevLV); 365 } 366 } 367 368 // - a function, unless it has internal linkage; or 369 } else if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 370 // In theory, we can modify the function's LV by the LV of its 371 // type unless it has C linkage (see comment above about variables 372 // for justification). In practice, GCC doesn't do this, so it's 373 // just too painful to make work. 374 375 if (Function->getStorageClass() == SC_PrivateExtern) 376 LV.setVisibility(HiddenVisibility, true); 377 378 // C99 6.2.2p5: 379 // If the declaration of an identifier for a function has no 380 // storage-class specifier, its linkage is determined exactly 381 // as if it were declared with the storage-class specifier 382 // extern. 383 if (!Context.getLangOptions().CPlusPlus && 384 (Function->getStorageClass() == SC_Extern || 385 Function->getStorageClass() == SC_PrivateExtern || 386 Function->getStorageClass() == SC_None)) { 387 // C99 6.2.2p4: 388 // For an identifier declared with the storage-class specifier 389 // extern in a scope in which a prior declaration of that 390 // identifier is visible, if the prior declaration specifies 391 // internal or external linkage, the linkage of the identifier 392 // at the later declaration is the same as the linkage 393 // specified at the prior declaration. If no prior declaration 394 // is visible, or if the prior declaration specifies no 395 // linkage, then the identifier has external linkage. 396 if (const FunctionDecl *PrevFunc = Function->getPreviousDeclaration()) { 397 LinkageInfo PrevLV = getLVForDecl(PrevFunc, F); 398 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 399 LV.mergeVisibility(PrevLV); 400 } 401 } 402 403 // In C++, then if the type of the function uses a type with 404 // unique-external linkage, it's not legally usable from outside 405 // this translation unit. However, we should use the C linkage 406 // rules instead for extern "C" declarations. 407 if (Context.getLangOptions().CPlusPlus && !Function->isExternC() && 408 Function->getType()->getLinkage() == UniqueExternalLinkage) 409 return LinkageInfo::uniqueExternal(); 410 411 if (FunctionTemplateSpecializationInfo *SpecInfo 412 = Function->getTemplateSpecializationInfo()) { 413 LV.merge(getLVForDecl(SpecInfo->getTemplate(), 414 F.onlyTemplateVisibility())); 415 const TemplateArgumentList &TemplateArgs = *SpecInfo->TemplateArguments; 416 LV.merge(getLVForTemplateArgumentList(TemplateArgs, F)); 417 } 418 419 // - a named class (Clause 9), or an unnamed class defined in a 420 // typedef declaration in which the class has the typedef name 421 // for linkage purposes (7.1.3); or 422 // - a named enumeration (7.2), or an unnamed enumeration 423 // defined in a typedef declaration in which the enumeration 424 // has the typedef name for linkage purposes (7.1.3); or 425 } else if (const TagDecl *Tag = dyn_cast<TagDecl>(D)) { 426 // Unnamed tags have no linkage. 427 if (!Tag->getDeclName() && !Tag->getTypedefForAnonDecl()) 428 return LinkageInfo::none(); 429 430 // If this is a class template specialization, consider the 431 // linkage of the template and template arguments. 432 if (const ClassTemplateSpecializationDecl *Spec 433 = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) { 434 // From the template. 435 LV.merge(getLVForDecl(Spec->getSpecializedTemplate(), 436 F.onlyTemplateVisibility())); 437 438 // The arguments at which the template was instantiated. 439 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 440 LV.merge(getLVForTemplateArgumentList(TemplateArgs, F)); 441 } 442 443 // Consider -fvisibility unless the type has C linkage. 444 if (F.ConsiderGlobalVisibility) 445 F.ConsiderGlobalVisibility = 446 (Context.getLangOptions().CPlusPlus && 447 !Tag->getDeclContext()->isExternCContext()); 448 449 // - an enumerator belonging to an enumeration with external linkage; 450 } else if (isa<EnumConstantDecl>(D)) { 451 LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()), F); 452 if (!isExternalLinkage(EnumLV.linkage())) 453 return LinkageInfo::none(); 454 LV.merge(EnumLV); 455 456 // - a template, unless it is a function template that has 457 // internal linkage (Clause 14); 458 } else if (const TemplateDecl *temp = dyn_cast<TemplateDecl>(D)) { 459 if (F.ConsiderTemplateParameterTypes) 460 LV.merge(getLVForTemplateParameterList(temp->getTemplateParameters())); 461 462 // - a namespace (7.3), unless it is declared within an unnamed 463 // namespace. 464 } else if (isa<NamespaceDecl>(D) && !D->isInAnonymousNamespace()) { 465 return LV; 466 467 // By extension, we assign external linkage to Objective-C 468 // interfaces. 469 } else if (isa<ObjCInterfaceDecl>(D)) { 470 // fallout 471 472 // Everything not covered here has no linkage. 473 } else { 474 return LinkageInfo::none(); 475 } 476 477 // If we ended up with non-external linkage, visibility should 478 // always be default. 479 if (LV.linkage() != ExternalLinkage) 480 return LinkageInfo(LV.linkage(), DefaultVisibility, false); 481 482 // If we didn't end up with hidden visibility, consider attributes 483 // and -fvisibility. 484 if (F.ConsiderGlobalVisibility) 485 LV.mergeVisibility(Context.getLangOptions().getVisibilityMode()); 486 487 return LV; 488} 489 490static LinkageInfo getLVForClassMember(const NamedDecl *D, LVFlags F) { 491 // Only certain class members have linkage. Note that fields don't 492 // really have linkage, but it's convenient to say they do for the 493 // purposes of calculating linkage of pointer-to-data-member 494 // template arguments. 495 if (!(isa<CXXMethodDecl>(D) || 496 isa<VarDecl>(D) || 497 isa<FieldDecl>(D) || 498 (isa<TagDecl>(D) && 499 (D->getDeclName() || cast<TagDecl>(D)->getTypedefForAnonDecl())))) 500 return LinkageInfo::none(); 501 502 LinkageInfo LV; 503 504 // The flags we're going to use to compute the class's visibility. 505 LVFlags ClassF = F; 506 507 // If we have an explicit visibility attribute, merge that in. 508 if (F.ConsiderVisibilityAttributes) { 509 if (const VisibilityAttr *VA = GetExplicitVisibility(D)) { 510 LV.mergeVisibility(GetVisibilityFromAttr(VA), true); 511 512 // Ignore global visibility later, but not this attribute. 513 F.ConsiderGlobalVisibility = false; 514 515 // Ignore both global visibility and attributes when computing our 516 // parent's visibility. 517 ClassF = F.onlyTemplateVisibility(); 518 } 519 } 520 521 // Class members only have linkage if their class has external 522 // linkage. 523 LV.merge(getLVForDecl(cast<RecordDecl>(D->getDeclContext()), ClassF)); 524 if (!isExternalLinkage(LV.linkage())) 525 return LinkageInfo::none(); 526 527 // If the class already has unique-external linkage, we can't improve. 528 if (LV.linkage() == UniqueExternalLinkage) 529 return LinkageInfo::uniqueExternal(); 530 531 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 532 // If the type of the function uses a type with unique-external 533 // linkage, it's not legally usable from outside this translation unit. 534 if (MD->getType()->getLinkage() == UniqueExternalLinkage) 535 return LinkageInfo::uniqueExternal(); 536 537 TemplateSpecializationKind TSK = TSK_Undeclared; 538 539 // If this is a method template specialization, use the linkage for 540 // the template parameters and arguments. 541 if (FunctionTemplateSpecializationInfo *Spec 542 = MD->getTemplateSpecializationInfo()) { 543 LV.merge(getLVForTemplateArgumentList(*Spec->TemplateArguments, F)); 544 if (F.ConsiderTemplateParameterTypes) 545 LV.merge(getLVForTemplateParameterList( 546 Spec->getTemplate()->getTemplateParameters())); 547 548 TSK = Spec->getTemplateSpecializationKind(); 549 } else if (MemberSpecializationInfo *MSI = 550 MD->getMemberSpecializationInfo()) { 551 TSK = MSI->getTemplateSpecializationKind(); 552 } 553 554 // If we're paying attention to global visibility, apply 555 // -finline-visibility-hidden if this is an inline method. 556 // 557 // Note that ConsiderGlobalVisibility doesn't yet have information 558 // about whether containing classes have visibility attributes, 559 // and that's intentional. 560 if (TSK != TSK_ExplicitInstantiationDeclaration && 561 F.ConsiderGlobalVisibility && 562 MD->getASTContext().getLangOptions().InlineVisibilityHidden) { 563 // InlineVisibilityHidden only applies to definitions, and 564 // isInlined() only gives meaningful answers on definitions 565 // anyway. 566 const FunctionDecl *Def = 0; 567 if (MD->hasBody(Def) && Def->isInlined()) 568 LV.setVisibility(HiddenVisibility); 569 } 570 571 // Note that in contrast to basically every other situation, we 572 // *do* apply -fvisibility to method declarations. 573 574 } else if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) { 575 if (const ClassTemplateSpecializationDecl *Spec 576 = dyn_cast<ClassTemplateSpecializationDecl>(RD)) { 577 // Merge template argument/parameter information for member 578 // class template specializations. 579 LV.merge(getLVForTemplateArgumentList(Spec->getTemplateArgs(), F)); 580 if (F.ConsiderTemplateParameterTypes) 581 LV.merge(getLVForTemplateParameterList( 582 Spec->getSpecializedTemplate()->getTemplateParameters())); 583 } 584 585 // Static data members. 586 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 587 // Modify the variable's linkage by its type, but ignore the 588 // type's visibility unless it's a definition. 589 LVPair TypeLV = VD->getType()->getLinkageAndVisibility(); 590 if (TypeLV.first != ExternalLinkage) 591 LV.mergeLinkage(UniqueExternalLinkage); 592 if (!LV.visibilityExplicit()) 593 LV.mergeVisibility(TypeLV.second); 594 } 595 596 F.ConsiderGlobalVisibility &= !LV.visibilityExplicit(); 597 598 // Apply -fvisibility if desired. 599 if (F.ConsiderGlobalVisibility && LV.visibility() != HiddenVisibility) { 600 LV.mergeVisibility(D->getASTContext().getLangOptions().getVisibilityMode()); 601 } 602 603 return LV; 604} 605 606static void clearLinkageForClass(const CXXRecordDecl *record) { 607 for (CXXRecordDecl::decl_iterator 608 i = record->decls_begin(), e = record->decls_end(); i != e; ++i) { 609 Decl *child = *i; 610 if (isa<NamedDecl>(child)) 611 cast<NamedDecl>(child)->ClearLinkageCache(); 612 } 613} 614 615void NamedDecl::ClearLinkageCache() { 616 // Note that we can't skip clearing the linkage of children just 617 // because the parent doesn't have cached linkage: we don't cache 618 // when computing linkage for parent contexts. 619 620 HasCachedLinkage = 0; 621 622 // If we're changing the linkage of a class, we need to reset the 623 // linkage of child declarations, too. 624 if (const CXXRecordDecl *record = dyn_cast<CXXRecordDecl>(this)) 625 clearLinkageForClass(record); 626 627 if (ClassTemplateDecl *temp = 628 dyn_cast<ClassTemplateDecl>(const_cast<NamedDecl*>(this))) { 629 // Clear linkage for the template pattern. 630 CXXRecordDecl *record = temp->getTemplatedDecl(); 631 record->HasCachedLinkage = 0; 632 clearLinkageForClass(record); 633 634 // We need to clear linkage for specializations, too. 635 for (ClassTemplateDecl::spec_iterator 636 i = temp->spec_begin(), e = temp->spec_end(); i != e; ++i) 637 i->ClearLinkageCache(); 638 } 639 640 // Clear cached linkage for function template decls, too. 641 if (FunctionTemplateDecl *temp = 642 dyn_cast<FunctionTemplateDecl>(const_cast<NamedDecl*>(this))) 643 for (FunctionTemplateDecl::spec_iterator 644 i = temp->spec_begin(), e = temp->spec_end(); i != e; ++i) 645 i->ClearLinkageCache(); 646 647} 648 649Linkage NamedDecl::getLinkage() const { 650 if (HasCachedLinkage) { 651 assert(Linkage(CachedLinkage) == 652 getLVForDecl(this, LVFlags::CreateOnlyDeclLinkage()).linkage()); 653 return Linkage(CachedLinkage); 654 } 655 656 CachedLinkage = getLVForDecl(this, 657 LVFlags::CreateOnlyDeclLinkage()).linkage(); 658 HasCachedLinkage = 1; 659 return Linkage(CachedLinkage); 660} 661 662LinkageInfo NamedDecl::getLinkageAndVisibility() const { 663 LinkageInfo LI = getLVForDecl(this, LVFlags()); 664 assert(!HasCachedLinkage || Linkage(CachedLinkage) == LI.linkage()); 665 HasCachedLinkage = 1; 666 CachedLinkage = LI.linkage(); 667 return LI; 668} 669 670static LinkageInfo getLVForDecl(const NamedDecl *D, LVFlags Flags) { 671 // Objective-C: treat all Objective-C declarations as having external 672 // linkage. 673 switch (D->getKind()) { 674 default: 675 break; 676 case Decl::TemplateTemplateParm: // count these as external 677 case Decl::NonTypeTemplateParm: 678 case Decl::ObjCAtDefsField: 679 case Decl::ObjCCategory: 680 case Decl::ObjCCategoryImpl: 681 case Decl::ObjCCompatibleAlias: 682 case Decl::ObjCForwardProtocol: 683 case Decl::ObjCImplementation: 684 case Decl::ObjCMethod: 685 case Decl::ObjCProperty: 686 case Decl::ObjCPropertyImpl: 687 case Decl::ObjCProtocol: 688 return LinkageInfo::external(); 689 } 690 691 // Handle linkage for namespace-scope names. 692 if (D->getDeclContext()->getRedeclContext()->isFileContext()) 693 return getLVForNamespaceScopeDecl(D, Flags); 694 695 // C++ [basic.link]p5: 696 // In addition, a member function, static data member, a named 697 // class or enumeration of class scope, or an unnamed class or 698 // enumeration defined in a class-scope typedef declaration such 699 // that the class or enumeration has the typedef name for linkage 700 // purposes (7.1.3), has external linkage if the name of the class 701 // has external linkage. 702 if (D->getDeclContext()->isRecord()) 703 return getLVForClassMember(D, Flags); 704 705 // C++ [basic.link]p6: 706 // The name of a function declared in block scope and the name of 707 // an object declared by a block scope extern declaration have 708 // linkage. If there is a visible declaration of an entity with 709 // linkage having the same name and type, ignoring entities 710 // declared outside the innermost enclosing namespace scope, the 711 // block scope declaration declares that same entity and receives 712 // the linkage of the previous declaration. If there is more than 713 // one such matching entity, the program is ill-formed. Otherwise, 714 // if no matching entity is found, the block scope entity receives 715 // external linkage. 716 if (D->getLexicalDeclContext()->isFunctionOrMethod()) { 717 if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { 718 if (Function->isInAnonymousNamespace() && !Function->isExternC()) 719 return LinkageInfo::uniqueExternal(); 720 721 LinkageInfo LV; 722 if (Flags.ConsiderVisibilityAttributes) { 723 if (const VisibilityAttr *VA = GetExplicitVisibility(Function)) 724 LV.setVisibility(GetVisibilityFromAttr(VA)); 725 } 726 727 if (const FunctionDecl *Prev = Function->getPreviousDeclaration()) { 728 LinkageInfo PrevLV = getLVForDecl(Prev, Flags); 729 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 730 LV.mergeVisibility(PrevLV); 731 } 732 733 return LV; 734 } 735 736 if (const VarDecl *Var = dyn_cast<VarDecl>(D)) 737 if (Var->getStorageClass() == SC_Extern || 738 Var->getStorageClass() == SC_PrivateExtern) { 739 if (Var->isInAnonymousNamespace() && !Var->isExternC()) 740 return LinkageInfo::uniqueExternal(); 741 742 LinkageInfo LV; 743 if (Var->getStorageClass() == SC_PrivateExtern) 744 LV.setVisibility(HiddenVisibility); 745 else if (Flags.ConsiderVisibilityAttributes) { 746 if (const VisibilityAttr *VA = GetExplicitVisibility(Var)) 747 LV.setVisibility(GetVisibilityFromAttr(VA)); 748 } 749 750 if (const VarDecl *Prev = Var->getPreviousDeclaration()) { 751 LinkageInfo PrevLV = getLVForDecl(Prev, Flags); 752 if (PrevLV.linkage()) LV.setLinkage(PrevLV.linkage()); 753 LV.mergeVisibility(PrevLV); 754 } 755 756 return LV; 757 } 758 } 759 760 // C++ [basic.link]p6: 761 // Names not covered by these rules have no linkage. 762 return LinkageInfo::none(); 763} 764 765std::string NamedDecl::getQualifiedNameAsString() const { 766 return getQualifiedNameAsString(getASTContext().getLangOptions()); 767} 768 769std::string NamedDecl::getQualifiedNameAsString(const PrintingPolicy &P) const { 770 const DeclContext *Ctx = getDeclContext(); 771 772 if (Ctx->isFunctionOrMethod()) 773 return getNameAsString(); 774 775 typedef llvm::SmallVector<const DeclContext *, 8> ContextsTy; 776 ContextsTy Contexts; 777 778 // Collect contexts. 779 while (Ctx && isa<NamedDecl>(Ctx)) { 780 Contexts.push_back(Ctx); 781 Ctx = Ctx->getParent(); 782 }; 783 784 std::string QualName; 785 llvm::raw_string_ostream OS(QualName); 786 787 for (ContextsTy::reverse_iterator I = Contexts.rbegin(), E = Contexts.rend(); 788 I != E; ++I) { 789 if (const ClassTemplateSpecializationDecl *Spec 790 = dyn_cast<ClassTemplateSpecializationDecl>(*I)) { 791 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs(); 792 std::string TemplateArgsStr 793 = TemplateSpecializationType::PrintTemplateArgumentList( 794 TemplateArgs.data(), 795 TemplateArgs.size(), 796 P); 797 OS << Spec->getName() << TemplateArgsStr; 798 } else if (const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(*I)) { 799 if (ND->isAnonymousNamespace()) 800 OS << "<anonymous namespace>"; 801 else 802 OS << ND; 803 } else if (const RecordDecl *RD = dyn_cast<RecordDecl>(*I)) { 804 if (!RD->getIdentifier()) 805 OS << "<anonymous " << RD->getKindName() << '>'; 806 else 807 OS << RD; 808 } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) { 809 const FunctionProtoType *FT = 0; 810 if (FD->hasWrittenPrototype()) 811 FT = dyn_cast<FunctionProtoType>(FD->getType()->getAs<FunctionType>()); 812 813 OS << FD << '('; 814 if (FT) { 815 unsigned NumParams = FD->getNumParams(); 816 for (unsigned i = 0; i < NumParams; ++i) { 817 if (i) 818 OS << ", "; 819 std::string Param; 820 FD->getParamDecl(i)->getType().getAsStringInternal(Param, P); 821 OS << Param; 822 } 823 824 if (FT->isVariadic()) { 825 if (NumParams > 0) 826 OS << ", "; 827 OS << "..."; 828 } 829 } 830 OS << ')'; 831 } else { 832 OS << cast<NamedDecl>(*I); 833 } 834 OS << "::"; 835 } 836 837 if (getDeclName()) 838 OS << this; 839 else 840 OS << "<anonymous>"; 841 842 return OS.str(); 843} 844 845bool NamedDecl::declarationReplaces(NamedDecl *OldD) const { 846 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch"); 847 848 // UsingDirectiveDecl's are not really NamedDecl's, and all have same name. 849 // We want to keep it, unless it nominates same namespace. 850 if (getKind() == Decl::UsingDirective) { 851 return cast<UsingDirectiveDecl>(this)->getNominatedNamespace() 852 ->getOriginalNamespace() == 853 cast<UsingDirectiveDecl>(OldD)->getNominatedNamespace() 854 ->getOriginalNamespace(); 855 } 856 857 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(this)) 858 // For function declarations, we keep track of redeclarations. 859 return FD->getPreviousDeclaration() == OldD; 860 861 // For function templates, the underlying function declarations are linked. 862 if (const FunctionTemplateDecl *FunctionTemplate 863 = dyn_cast<FunctionTemplateDecl>(this)) 864 if (const FunctionTemplateDecl *OldFunctionTemplate 865 = dyn_cast<FunctionTemplateDecl>(OldD)) 866 return FunctionTemplate->getTemplatedDecl() 867 ->declarationReplaces(OldFunctionTemplate->getTemplatedDecl()); 868 869 // For method declarations, we keep track of redeclarations. 870 if (isa<ObjCMethodDecl>(this)) 871 return false; 872 873 if (isa<ObjCInterfaceDecl>(this) && isa<ObjCCompatibleAliasDecl>(OldD)) 874 return true; 875 876 if (isa<UsingShadowDecl>(this) && isa<UsingShadowDecl>(OldD)) 877 return cast<UsingShadowDecl>(this)->getTargetDecl() == 878 cast<UsingShadowDecl>(OldD)->getTargetDecl(); 879 880 if (isa<UsingDecl>(this) && isa<UsingDecl>(OldD)) { 881 ASTContext &Context = getASTContext(); 882 return Context.getCanonicalNestedNameSpecifier( 883 cast<UsingDecl>(this)->getQualifier()) == 884 Context.getCanonicalNestedNameSpecifier( 885 cast<UsingDecl>(OldD)->getQualifier()); 886 } 887 888 // For non-function declarations, if the declarations are of the 889 // same kind then this must be a redeclaration, or semantic analysis 890 // would not have given us the new declaration. 891 return this->getKind() == OldD->getKind(); 892} 893 894bool NamedDecl::hasLinkage() const { 895 return getLinkage() != NoLinkage; 896} 897 898NamedDecl *NamedDecl::getUnderlyingDecl() { 899 NamedDecl *ND = this; 900 while (true) { 901 if (UsingShadowDecl *UD = dyn_cast<UsingShadowDecl>(ND)) 902 ND = UD->getTargetDecl(); 903 else if (ObjCCompatibleAliasDecl *AD 904 = dyn_cast<ObjCCompatibleAliasDecl>(ND)) 905 return AD->getClassInterface(); 906 else 907 return ND; 908 } 909} 910 911bool NamedDecl::isCXXInstanceMember() const { 912 assert(isCXXClassMember() && 913 "checking whether non-member is instance member"); 914 915 const NamedDecl *D = this; 916 if (isa<UsingShadowDecl>(D)) 917 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 918 919 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D)) 920 return true; 921 if (isa<CXXMethodDecl>(D)) 922 return cast<CXXMethodDecl>(D)->isInstance(); 923 if (isa<FunctionTemplateDecl>(D)) 924 return cast<CXXMethodDecl>(cast<FunctionTemplateDecl>(D) 925 ->getTemplatedDecl())->isInstance(); 926 return false; 927} 928 929//===----------------------------------------------------------------------===// 930// DeclaratorDecl Implementation 931//===----------------------------------------------------------------------===// 932 933template <typename DeclT> 934static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) { 935 if (decl->getNumTemplateParameterLists() > 0) 936 return decl->getTemplateParameterList(0)->getTemplateLoc(); 937 else 938 return decl->getInnerLocStart(); 939} 940 941SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const { 942 TypeSourceInfo *TSI = getTypeSourceInfo(); 943 if (TSI) return TSI->getTypeLoc().getBeginLoc(); 944 return SourceLocation(); 945} 946 947void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) { 948 if (QualifierLoc) { 949 // Make sure the extended decl info is allocated. 950 if (!hasExtInfo()) { 951 // Save (non-extended) type source info pointer. 952 TypeSourceInfo *savedTInfo = DeclInfo.get<TypeSourceInfo*>(); 953 // Allocate external info struct. 954 DeclInfo = new (getASTContext()) ExtInfo; 955 // Restore savedTInfo into (extended) decl info. 956 getExtInfo()->TInfo = savedTInfo; 957 } 958 // Set qualifier info. 959 getExtInfo()->QualifierLoc = QualifierLoc; 960 } 961 else { 962 // Here Qualifier == 0, i.e., we are removing the qualifier (if any). 963 if (hasExtInfo()) { 964 // Save type source info pointer. 965 TypeSourceInfo *savedTInfo = getExtInfo()->TInfo; 966 // Deallocate the extended decl info. 967 getASTContext().Deallocate(getExtInfo()); 968 // Restore savedTInfo into (non-extended) decl info. 969 DeclInfo = savedTInfo; 970 } 971 } 972} 973 974SourceLocation DeclaratorDecl::getOuterLocStart() const { 975 return getTemplateOrInnerLocStart(this); 976} 977 978void 979QualifierInfo::setTemplateParameterListsInfo(ASTContext &Context, 980 unsigned NumTPLists, 981 TemplateParameterList **TPLists) { 982 assert((NumTPLists == 0 || TPLists != 0) && 983 "Empty array of template parameters with positive size!"); 984 assert((NumTPLists == 0 || QualifierLoc) && 985 "Nonempty array of template parameters with no qualifier!"); 986 987 // Free previous template parameters (if any). 988 if (NumTemplParamLists > 0) { 989 Context.Deallocate(TemplParamLists); 990 TemplParamLists = 0; 991 NumTemplParamLists = 0; 992 } 993 // Set info on matched template parameter lists (if any). 994 if (NumTPLists > 0) { 995 TemplParamLists = new (Context) TemplateParameterList*[NumTPLists]; 996 NumTemplParamLists = NumTPLists; 997 for (unsigned i = NumTPLists; i-- > 0; ) 998 TemplParamLists[i] = TPLists[i]; 999 } 1000} 1001 1002//===----------------------------------------------------------------------===// 1003// VarDecl Implementation 1004//===----------------------------------------------------------------------===// 1005 1006const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) { 1007 switch (SC) { 1008 case SC_None: break; 1009 case SC_Auto: return "auto"; break; 1010 case SC_Extern: return "extern"; break; 1011 case SC_PrivateExtern: return "__private_extern__"; break; 1012 case SC_Register: return "register"; break; 1013 case SC_Static: return "static"; break; 1014 } 1015 1016 assert(0 && "Invalid storage class"); 1017 return 0; 1018} 1019 1020VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L, 1021 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, 1022 StorageClass S, StorageClass SCAsWritten) { 1023 return new (C) VarDecl(Var, DC, L, Id, T, TInfo, S, SCAsWritten); 1024} 1025 1026void VarDecl::setStorageClass(StorageClass SC) { 1027 assert(isLegalForVariable(SC)); 1028 if (getStorageClass() != SC) 1029 ClearLinkageCache(); 1030 1031 SClass = SC; 1032} 1033 1034SourceLocation VarDecl::getInnerLocStart() const { 1035 SourceLocation Start = getTypeSpecStartLoc(); 1036 if (Start.isInvalid()) 1037 Start = getLocation(); 1038 return Start; 1039} 1040 1041SourceRange VarDecl::getSourceRange() const { 1042 if (getInit()) 1043 return SourceRange(getOuterLocStart(), getInit()->getLocEnd()); 1044 return SourceRange(getOuterLocStart(), getLocation()); 1045} 1046 1047bool VarDecl::isExternC() const { 1048 ASTContext &Context = getASTContext(); 1049 if (!Context.getLangOptions().CPlusPlus) 1050 return (getDeclContext()->isTranslationUnit() && 1051 getStorageClass() != SC_Static) || 1052 (getDeclContext()->isFunctionOrMethod() && hasExternalStorage()); 1053 1054 const DeclContext *DC = getDeclContext(); 1055 if (DC->isFunctionOrMethod()) 1056 return false; 1057 1058 for (; !DC->isTranslationUnit(); DC = DC->getParent()) { 1059 if (const LinkageSpecDecl *Linkage = dyn_cast<LinkageSpecDecl>(DC)) { 1060 if (Linkage->getLanguage() == LinkageSpecDecl::lang_c) 1061 return getStorageClass() != SC_Static; 1062 1063 break; 1064 } 1065 1066 } 1067 1068 return false; 1069} 1070 1071VarDecl *VarDecl::getCanonicalDecl() { 1072 return getFirstDeclaration(); 1073} 1074 1075VarDecl::DefinitionKind VarDecl::isThisDeclarationADefinition() const { 1076 // C++ [basic.def]p2: 1077 // A declaration is a definition unless [...] it contains the 'extern' 1078 // specifier or a linkage-specification and neither an initializer [...], 1079 // it declares a static data member in a class declaration [...]. 1080 // C++ [temp.expl.spec]p15: 1081 // An explicit specialization of a static data member of a template is a 1082 // definition if the declaration includes an initializer; otherwise, it is 1083 // a declaration. 1084 if (isStaticDataMember()) { 1085 if (isOutOfLine() && (hasInit() || 1086 getTemplateSpecializationKind() != TSK_ExplicitSpecialization)) 1087 return Definition; 1088 else 1089 return DeclarationOnly; 1090 } 1091 // C99 6.7p5: 1092 // A definition of an identifier is a declaration for that identifier that 1093 // [...] causes storage to be reserved for that object. 1094 // Note: that applies for all non-file-scope objects. 1095 // C99 6.9.2p1: 1096 // If the declaration of an identifier for an object has file scope and an 1097 // initializer, the declaration is an external definition for the identifier 1098 if (hasInit()) 1099 return Definition; 1100 // AST for 'extern "C" int foo;' is annotated with 'extern'. 1101 if (hasExternalStorage()) 1102 return DeclarationOnly; 1103 1104 if (getStorageClassAsWritten() == SC_Extern || 1105 getStorageClassAsWritten() == SC_PrivateExtern) { 1106 for (const VarDecl *PrevVar = getPreviousDeclaration(); 1107 PrevVar; PrevVar = PrevVar->getPreviousDeclaration()) { 1108 if (PrevVar->getLinkage() == InternalLinkage && PrevVar->hasInit()) 1109 return DeclarationOnly; 1110 } 1111 } 1112 // C99 6.9.2p2: 1113 // A declaration of an object that has file scope without an initializer, 1114 // and without a storage class specifier or the scs 'static', constitutes 1115 // a tentative definition. 1116 // No such thing in C++. 1117 if (!getASTContext().getLangOptions().CPlusPlus && isFileVarDecl()) 1118 return TentativeDefinition; 1119 1120 // What's left is (in C, block-scope) declarations without initializers or 1121 // external storage. These are definitions. 1122 return Definition; 1123} 1124 1125VarDecl *VarDecl::getActingDefinition() { 1126 DefinitionKind Kind = isThisDeclarationADefinition(); 1127 if (Kind != TentativeDefinition) 1128 return 0; 1129 1130 VarDecl *LastTentative = 0; 1131 VarDecl *First = getFirstDeclaration(); 1132 for (redecl_iterator I = First->redecls_begin(), E = First->redecls_end(); 1133 I != E; ++I) { 1134 Kind = (*I)->isThisDeclarationADefinition(); 1135 if (Kind == Definition) 1136 return 0; 1137 else if (Kind == TentativeDefinition) 1138 LastTentative = *I; 1139 } 1140 return LastTentative; 1141} 1142 1143bool VarDecl::isTentativeDefinitionNow() const { 1144 DefinitionKind Kind = isThisDeclarationADefinition(); 1145 if (Kind != TentativeDefinition) 1146 return false; 1147 1148 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1149 if ((*I)->isThisDeclarationADefinition() == Definition) 1150 return false; 1151 } 1152 return true; 1153} 1154 1155VarDecl *VarDecl::getDefinition() { 1156 VarDecl *First = getFirstDeclaration(); 1157 for (redecl_iterator I = First->redecls_begin(), E = First->redecls_end(); 1158 I != E; ++I) { 1159 if ((*I)->isThisDeclarationADefinition() == Definition) 1160 return *I; 1161 } 1162 return 0; 1163} 1164 1165VarDecl::DefinitionKind VarDecl::hasDefinition() const { 1166 DefinitionKind Kind = DeclarationOnly; 1167 1168 const VarDecl *First = getFirstDeclaration(); 1169 for (redecl_iterator I = First->redecls_begin(), E = First->redecls_end(); 1170 I != E; ++I) 1171 Kind = std::max(Kind, (*I)->isThisDeclarationADefinition()); 1172 1173 return Kind; 1174} 1175 1176const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const { 1177 redecl_iterator I = redecls_begin(), E = redecls_end(); 1178 while (I != E && !I->getInit()) 1179 ++I; 1180 1181 if (I != E) { 1182 D = *I; 1183 return I->getInit(); 1184 } 1185 return 0; 1186} 1187 1188bool VarDecl::isOutOfLine() const { 1189 if (Decl::isOutOfLine()) 1190 return true; 1191 1192 if (!isStaticDataMember()) 1193 return false; 1194 1195 // If this static data member was instantiated from a static data member of 1196 // a class template, check whether that static data member was defined 1197 // out-of-line. 1198 if (VarDecl *VD = getInstantiatedFromStaticDataMember()) 1199 return VD->isOutOfLine(); 1200 1201 return false; 1202} 1203 1204VarDecl *VarDecl::getOutOfLineDefinition() { 1205 if (!isStaticDataMember()) 1206 return 0; 1207 1208 for (VarDecl::redecl_iterator RD = redecls_begin(), RDEnd = redecls_end(); 1209 RD != RDEnd; ++RD) { 1210 if (RD->getLexicalDeclContext()->isFileContext()) 1211 return *RD; 1212 } 1213 1214 return 0; 1215} 1216 1217void VarDecl::setInit(Expr *I) { 1218 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>()) { 1219 Eval->~EvaluatedStmt(); 1220 getASTContext().Deallocate(Eval); 1221 } 1222 1223 Init = I; 1224} 1225 1226VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const { 1227 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) 1228 return cast<VarDecl>(MSI->getInstantiatedFrom()); 1229 1230 return 0; 1231} 1232 1233TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const { 1234 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) 1235 return MSI->getTemplateSpecializationKind(); 1236 1237 return TSK_Undeclared; 1238} 1239 1240MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const { 1241 return getASTContext().getInstantiatedFromStaticDataMember(this); 1242} 1243 1244void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK, 1245 SourceLocation PointOfInstantiation) { 1246 MemberSpecializationInfo *MSI = getMemberSpecializationInfo(); 1247 assert(MSI && "Not an instantiated static data member?"); 1248 MSI->setTemplateSpecializationKind(TSK); 1249 if (TSK != TSK_ExplicitSpecialization && 1250 PointOfInstantiation.isValid() && 1251 MSI->getPointOfInstantiation().isInvalid()) 1252 MSI->setPointOfInstantiation(PointOfInstantiation); 1253} 1254 1255//===----------------------------------------------------------------------===// 1256// ParmVarDecl Implementation 1257//===----------------------------------------------------------------------===// 1258 1259ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC, 1260 SourceLocation L, IdentifierInfo *Id, 1261 QualType T, TypeSourceInfo *TInfo, 1262 StorageClass S, StorageClass SCAsWritten, 1263 Expr *DefArg) { 1264 return new (C) ParmVarDecl(ParmVar, DC, L, Id, T, TInfo, 1265 S, SCAsWritten, DefArg); 1266} 1267 1268Expr *ParmVarDecl::getDefaultArg() { 1269 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!"); 1270 assert(!hasUninstantiatedDefaultArg() && 1271 "Default argument is not yet instantiated!"); 1272 1273 Expr *Arg = getInit(); 1274 if (ExprWithCleanups *E = dyn_cast_or_null<ExprWithCleanups>(Arg)) 1275 return E->getSubExpr(); 1276 1277 return Arg; 1278} 1279 1280unsigned ParmVarDecl::getNumDefaultArgTemporaries() const { 1281 if (const ExprWithCleanups *E = dyn_cast<ExprWithCleanups>(getInit())) 1282 return E->getNumTemporaries(); 1283 1284 return 0; 1285} 1286 1287CXXTemporary *ParmVarDecl::getDefaultArgTemporary(unsigned i) { 1288 assert(getNumDefaultArgTemporaries() && 1289 "Default arguments does not have any temporaries!"); 1290 1291 ExprWithCleanups *E = cast<ExprWithCleanups>(getInit()); 1292 return E->getTemporary(i); 1293} 1294 1295SourceRange ParmVarDecl::getDefaultArgRange() const { 1296 if (const Expr *E = getInit()) 1297 return E->getSourceRange(); 1298 1299 if (hasUninstantiatedDefaultArg()) 1300 return getUninstantiatedDefaultArg()->getSourceRange(); 1301 1302 return SourceRange(); 1303} 1304 1305bool ParmVarDecl::isParameterPack() const { 1306 return isa<PackExpansionType>(getType()); 1307} 1308 1309//===----------------------------------------------------------------------===// 1310// FunctionDecl Implementation 1311//===----------------------------------------------------------------------===// 1312 1313void FunctionDecl::getNameForDiagnostic(std::string &S, 1314 const PrintingPolicy &Policy, 1315 bool Qualified) const { 1316 NamedDecl::getNameForDiagnostic(S, Policy, Qualified); 1317 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs(); 1318 if (TemplateArgs) 1319 S += TemplateSpecializationType::PrintTemplateArgumentList( 1320 TemplateArgs->data(), 1321 TemplateArgs->size(), 1322 Policy); 1323 1324} 1325 1326bool FunctionDecl::isVariadic() const { 1327 if (const FunctionProtoType *FT = getType()->getAs<FunctionProtoType>()) 1328 return FT->isVariadic(); 1329 return false; 1330} 1331 1332bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const { 1333 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1334 if (I->Body) { 1335 Definition = *I; 1336 return true; 1337 } 1338 } 1339 1340 return false; 1341} 1342 1343Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const { 1344 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) { 1345 if (I->Body) { 1346 Definition = *I; 1347 return I->Body.get(getASTContext().getExternalSource()); 1348 } 1349 } 1350 1351 return 0; 1352} 1353 1354void FunctionDecl::setBody(Stmt *B) { 1355 Body = B; 1356 if (B) 1357 EndRangeLoc = B->getLocEnd(); 1358} 1359 1360void FunctionDecl::setPure(bool P) { 1361 IsPure = P; 1362 if (P) 1363 if (CXXRecordDecl *Parent = dyn_cast<CXXRecordDecl>(getDeclContext())) 1364 Parent->markedVirtualFunctionPure(); 1365} 1366 1367bool FunctionDecl::isMain() const { 1368 ASTContext &Context = getASTContext(); 1369 return !Context.getLangOptions().Freestanding && 1370 getDeclContext()->getRedeclContext()->isTranslationUnit() && 1371 getIdentifier() && getIdentifier()->isStr("main"); 1372} 1373 1374bool FunctionDecl::isExternC() const { 1375 ASTContext &Context = getASTContext(); 1376 // In C, any non-static, non-overloadable function has external 1377 // linkage. 1378 if (!Context.getLangOptions().CPlusPlus) 1379 return getStorageClass() != SC_Static && !getAttr<OverloadableAttr>(); 1380 1381 const DeclContext *DC = getDeclContext(); 1382 if (DC->isRecord()) 1383 return false; 1384 1385 for (; !DC->isTranslationUnit(); DC = DC->getParent()) { 1386 if (const LinkageSpecDecl *Linkage = dyn_cast<LinkageSpecDecl>(DC)) { 1387 if (Linkage->getLanguage() == LinkageSpecDecl::lang_c) 1388 return getStorageClass() != SC_Static && 1389 !getAttr<OverloadableAttr>(); 1390 1391 break; 1392 } 1393 } 1394 1395 return isMain(); 1396} 1397 1398bool FunctionDecl::isGlobal() const { 1399 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(this)) 1400 return Method->isStatic(); 1401 1402 if (getStorageClass() == SC_Static) 1403 return false; 1404 1405 for (const DeclContext *DC = getDeclContext(); 1406 DC->isNamespace(); 1407 DC = DC->getParent()) { 1408 if (const NamespaceDecl *Namespace = cast<NamespaceDecl>(DC)) { 1409 if (!Namespace->getDeclName()) 1410 return false; 1411 break; 1412 } 1413 } 1414 1415 return true; 1416} 1417 1418void 1419FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) { 1420 redeclarable_base::setPreviousDeclaration(PrevDecl); 1421 1422 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) { 1423 FunctionTemplateDecl *PrevFunTmpl 1424 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : 0; 1425 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch"); 1426 FunTmpl->setPreviousDeclaration(PrevFunTmpl); 1427 } 1428 1429 if (PrevDecl->IsInline) 1430 IsInline = true; 1431} 1432 1433const FunctionDecl *FunctionDecl::getCanonicalDecl() const { 1434 return getFirstDeclaration(); 1435} 1436 1437FunctionDecl *FunctionDecl::getCanonicalDecl() { 1438 return getFirstDeclaration(); 1439} 1440 1441void FunctionDecl::setStorageClass(StorageClass SC) { 1442 assert(isLegalForFunction(SC)); 1443 if (getStorageClass() != SC) 1444 ClearLinkageCache(); 1445 1446 SClass = SC; 1447} 1448 1449/// \brief Returns a value indicating whether this function 1450/// corresponds to a builtin function. 1451/// 1452/// The function corresponds to a built-in function if it is 1453/// declared at translation scope or within an extern "C" block and 1454/// its name matches with the name of a builtin. The returned value 1455/// will be 0 for functions that do not correspond to a builtin, a 1456/// value of type \c Builtin::ID if in the target-independent range 1457/// \c [1,Builtin::First), or a target-specific builtin value. 1458unsigned FunctionDecl::getBuiltinID() const { 1459 ASTContext &Context = getASTContext(); 1460 if (!getIdentifier() || !getIdentifier()->getBuiltinID()) 1461 return 0; 1462 1463 unsigned BuiltinID = getIdentifier()->getBuiltinID(); 1464 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) 1465 return BuiltinID; 1466 1467 // This function has the name of a known C library 1468 // function. Determine whether it actually refers to the C library 1469 // function or whether it just has the same name. 1470 1471 // If this is a static function, it's not a builtin. 1472 if (getStorageClass() == SC_Static) 1473 return 0; 1474 1475 // If this function is at translation-unit scope and we're not in 1476 // C++, it refers to the C library function. 1477 if (!Context.getLangOptions().CPlusPlus && 1478 getDeclContext()->isTranslationUnit()) 1479 return BuiltinID; 1480 1481 // If the function is in an extern "C" linkage specification and is 1482 // not marked "overloadable", it's the real function. 1483 if (isa<LinkageSpecDecl>(getDeclContext()) && 1484 cast<LinkageSpecDecl>(getDeclContext())->getLanguage() 1485 == LinkageSpecDecl::lang_c && 1486 !getAttr<OverloadableAttr>()) 1487 return BuiltinID; 1488 1489 // Not a builtin 1490 return 0; 1491} 1492 1493 1494/// getNumParams - Return the number of parameters this function must have 1495/// based on its FunctionType. This is the length of the ParamInfo array 1496/// after it has been created. 1497unsigned FunctionDecl::getNumParams() const { 1498 const FunctionType *FT = getType()->getAs<FunctionType>(); 1499 if (isa<FunctionNoProtoType>(FT)) 1500 return 0; 1501 return cast<FunctionProtoType>(FT)->getNumArgs(); 1502 1503} 1504 1505void FunctionDecl::setParams(ASTContext &C, 1506 ParmVarDecl **NewParamInfo, unsigned NumParams) { 1507 assert(ParamInfo == 0 && "Already has param info!"); 1508 assert(NumParams == getNumParams() && "Parameter count mismatch!"); 1509 1510 // Zero params -> null pointer. 1511 if (NumParams) { 1512 void *Mem = C.Allocate(sizeof(ParmVarDecl*)*NumParams); 1513 ParamInfo = new (Mem) ParmVarDecl*[NumParams]; 1514 memcpy(ParamInfo, NewParamInfo, sizeof(ParmVarDecl*)*NumParams); 1515 1516 // Update source range. The check below allows us to set EndRangeLoc before 1517 // setting the parameters. 1518 if (EndRangeLoc.isInvalid() || EndRangeLoc == getLocation()) 1519 EndRangeLoc = NewParamInfo[NumParams-1]->getLocEnd(); 1520 } 1521} 1522 1523/// getMinRequiredArguments - Returns the minimum number of arguments 1524/// needed to call this function. This may be fewer than the number of 1525/// function parameters, if some of the parameters have default 1526/// arguments (in C++) or the last parameter is a parameter pack. 1527unsigned FunctionDecl::getMinRequiredArguments() const { 1528 if (!getASTContext().getLangOptions().CPlusPlus) 1529 return getNumParams(); 1530 1531 unsigned NumRequiredArgs = getNumParams(); 1532 1533 // If the last parameter is a parameter pack, we don't need an argument for 1534 // it. 1535 if (NumRequiredArgs > 0 && 1536 getParamDecl(NumRequiredArgs - 1)->isParameterPack()) 1537 --NumRequiredArgs; 1538 1539 // If this parameter has a default argument, we don't need an argument for 1540 // it. 1541 while (NumRequiredArgs > 0 && 1542 getParamDecl(NumRequiredArgs-1)->hasDefaultArg()) 1543 --NumRequiredArgs; 1544 1545 // We might have parameter packs before the end. These can't be deduced, 1546 // but they can still handle multiple arguments. 1547 unsigned ArgIdx = NumRequiredArgs; 1548 while (ArgIdx > 0) { 1549 if (getParamDecl(ArgIdx - 1)->isParameterPack()) 1550 NumRequiredArgs = ArgIdx; 1551 1552 --ArgIdx; 1553 } 1554 1555 return NumRequiredArgs; 1556} 1557 1558bool FunctionDecl::isInlined() const { 1559 if (IsInline) 1560 return true; 1561 1562 if (isa<CXXMethodDecl>(this)) { 1563 if (!isOutOfLine() || getCanonicalDecl()->isInlineSpecified()) 1564 return true; 1565 } 1566 1567 switch (getTemplateSpecializationKind()) { 1568 case TSK_Undeclared: 1569 case TSK_ExplicitSpecialization: 1570 return false; 1571 1572 case TSK_ImplicitInstantiation: 1573 case TSK_ExplicitInstantiationDeclaration: 1574 case TSK_ExplicitInstantiationDefinition: 1575 // Handle below. 1576 break; 1577 } 1578 1579 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern(); 1580 bool HasPattern = false; 1581 if (PatternDecl) 1582 HasPattern = PatternDecl->hasBody(PatternDecl); 1583 1584 if (HasPattern && PatternDecl) 1585 return PatternDecl->isInlined(); 1586 1587 return false; 1588} 1589 1590/// \brief For an inline function definition in C or C++, determine whether the 1591/// definition will be externally visible. 1592/// 1593/// Inline function definitions are always available for inlining optimizations. 1594/// However, depending on the language dialect, declaration specifiers, and 1595/// attributes, the definition of an inline function may or may not be 1596/// "externally" visible to other translation units in the program. 1597/// 1598/// In C99, inline definitions are not externally visible by default. However, 1599/// if even one of the global-scope declarations is marked "extern inline", the 1600/// inline definition becomes externally visible (C99 6.7.4p6). 1601/// 1602/// In GNU89 mode, or if the gnu_inline attribute is attached to the function 1603/// definition, we use the GNU semantics for inline, which are nearly the 1604/// opposite of C99 semantics. In particular, "inline" by itself will create 1605/// an externally visible symbol, but "extern inline" will not create an 1606/// externally visible symbol. 1607bool FunctionDecl::isInlineDefinitionExternallyVisible() const { 1608 assert(isThisDeclarationADefinition() && "Must have the function definition"); 1609 assert(isInlined() && "Function must be inline"); 1610 ASTContext &Context = getASTContext(); 1611 1612 if (!Context.getLangOptions().C99 || hasAttr<GNUInlineAttr>()) { 1613 // If it's not the case that both 'inline' and 'extern' are 1614 // specified on the definition, then this inline definition is 1615 // externally visible. 1616 if (!(isInlineSpecified() && getStorageClassAsWritten() == SC_Extern)) 1617 return true; 1618 1619 // If any declaration is 'inline' but not 'extern', then this definition 1620 // is externally visible. 1621 for (redecl_iterator Redecl = redecls_begin(), RedeclEnd = redecls_end(); 1622 Redecl != RedeclEnd; 1623 ++Redecl) { 1624 if (Redecl->isInlineSpecified() && 1625 Redecl->getStorageClassAsWritten() != SC_Extern) 1626 return true; 1627 } 1628 1629 return false; 1630 } 1631 1632 // C99 6.7.4p6: 1633 // [...] If all of the file scope declarations for a function in a 1634 // translation unit include the inline function specifier without extern, 1635 // then the definition in that translation unit is an inline definition. 1636 for (redecl_iterator Redecl = redecls_begin(), RedeclEnd = redecls_end(); 1637 Redecl != RedeclEnd; 1638 ++Redecl) { 1639 // Only consider file-scope declarations in this test. 1640 if (!Redecl->getLexicalDeclContext()->isTranslationUnit()) 1641 continue; 1642 1643 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern) 1644 return true; // Not an inline definition 1645 } 1646 1647 // C99 6.7.4p6: 1648 // An inline definition does not provide an external definition for the 1649 // function, and does not forbid an external definition in another 1650 // translation unit. 1651 return false; 1652} 1653 1654/// getOverloadedOperator - Which C++ overloaded operator this 1655/// function represents, if any. 1656OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const { 1657 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName) 1658 return getDeclName().getCXXOverloadedOperator(); 1659 else 1660 return OO_None; 1661} 1662 1663/// getLiteralIdentifier - The literal suffix identifier this function 1664/// represents, if any. 1665const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const { 1666 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName) 1667 return getDeclName().getCXXLiteralIdentifier(); 1668 else 1669 return 0; 1670} 1671 1672FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const { 1673 if (TemplateOrSpecialization.isNull()) 1674 return TK_NonTemplate; 1675 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>()) 1676 return TK_FunctionTemplate; 1677 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>()) 1678 return TK_MemberSpecialization; 1679 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>()) 1680 return TK_FunctionTemplateSpecialization; 1681 if (TemplateOrSpecialization.is 1682 <DependentFunctionTemplateSpecializationInfo*>()) 1683 return TK_DependentFunctionTemplateSpecialization; 1684 1685 assert(false && "Did we miss a TemplateOrSpecialization type?"); 1686 return TK_NonTemplate; 1687} 1688 1689FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const { 1690 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo()) 1691 return cast<FunctionDecl>(Info->getInstantiatedFrom()); 1692 1693 return 0; 1694} 1695 1696MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const { 1697 return TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>(); 1698} 1699 1700void 1701FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C, 1702 FunctionDecl *FD, 1703 TemplateSpecializationKind TSK) { 1704 assert(TemplateOrSpecialization.isNull() && 1705 "Member function is already a specialization"); 1706 MemberSpecializationInfo *Info 1707 = new (C) MemberSpecializationInfo(FD, TSK); 1708 TemplateOrSpecialization = Info; 1709} 1710 1711bool FunctionDecl::isImplicitlyInstantiable() const { 1712 // If the function is invalid, it can't be implicitly instantiated. 1713 if (isInvalidDecl()) 1714 return false; 1715 1716 switch (getTemplateSpecializationKind()) { 1717 case TSK_Undeclared: 1718 case TSK_ExplicitSpecialization: 1719 case TSK_ExplicitInstantiationDefinition: 1720 return false; 1721 1722 case TSK_ImplicitInstantiation: 1723 return true; 1724 1725 case TSK_ExplicitInstantiationDeclaration: 1726 // Handled below. 1727 break; 1728 } 1729 1730 // Find the actual template from which we will instantiate. 1731 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern(); 1732 bool HasPattern = false; 1733 if (PatternDecl) 1734 HasPattern = PatternDecl->hasBody(PatternDecl); 1735 1736 // C++0x [temp.explicit]p9: 1737 // Except for inline functions, other explicit instantiation declarations 1738 // have the effect of suppressing the implicit instantiation of the entity 1739 // to which they refer. 1740 if (!HasPattern || !PatternDecl) 1741 return true; 1742 1743 return PatternDecl->isInlined(); 1744} 1745 1746FunctionDecl *FunctionDecl::getTemplateInstantiationPattern() const { 1747 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) { 1748 while (Primary->getInstantiatedFromMemberTemplate()) { 1749 // If we have hit a point where the user provided a specialization of 1750 // this template, we're done looking. 1751 if (Primary->isMemberSpecialization()) 1752 break; 1753 1754 Primary = Primary->getInstantiatedFromMemberTemplate(); 1755 } 1756 1757 return Primary->getTemplatedDecl(); 1758 } 1759 1760 return getInstantiatedFromMemberFunction(); 1761} 1762 1763FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const { 1764 if (FunctionTemplateSpecializationInfo *Info 1765 = TemplateOrSpecialization 1766 .dyn_cast<FunctionTemplateSpecializationInfo*>()) { 1767 return Info->Template.getPointer(); 1768 } 1769 return 0; 1770} 1771 1772const TemplateArgumentList * 1773FunctionDecl::getTemplateSpecializationArgs() const { 1774 if (FunctionTemplateSpecializationInfo *Info 1775 = TemplateOrSpecialization 1776 .dyn_cast<FunctionTemplateSpecializationInfo*>()) { 1777 return Info->TemplateArguments; 1778 } 1779 return 0; 1780} 1781 1782const TemplateArgumentListInfo * 1783FunctionDecl::getTemplateSpecializationArgsAsWritten() const { 1784 if (FunctionTemplateSpecializationInfo *Info 1785 = TemplateOrSpecialization 1786 .dyn_cast<FunctionTemplateSpecializationInfo*>()) { 1787 return Info->TemplateArgumentsAsWritten; 1788 } 1789 return 0; 1790} 1791 1792void 1793FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C, 1794 FunctionTemplateDecl *Template, 1795 const TemplateArgumentList *TemplateArgs, 1796 void *InsertPos, 1797 TemplateSpecializationKind TSK, 1798 const TemplateArgumentListInfo *TemplateArgsAsWritten, 1799 SourceLocation PointOfInstantiation) { 1800 assert(TSK != TSK_Undeclared && 1801 "Must specify the type of function template specialization"); 1802 FunctionTemplateSpecializationInfo *Info 1803 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>(); 1804 if (!Info) 1805 Info = FunctionTemplateSpecializationInfo::Create(C, this, Template, TSK, 1806 TemplateArgs, 1807 TemplateArgsAsWritten, 1808 PointOfInstantiation); 1809 TemplateOrSpecialization = Info; 1810 1811 // Insert this function template specialization into the set of known 1812 // function template specializations. 1813 if (InsertPos) 1814 Template->getSpecializations().InsertNode(Info, InsertPos); 1815 else { 1816 // Try to insert the new node. If there is an existing node, leave it, the 1817 // set will contain the canonical decls while 1818 // FunctionTemplateDecl::findSpecialization will return 1819 // the most recent redeclarations. 1820 FunctionTemplateSpecializationInfo *Existing 1821 = Template->getSpecializations().GetOrInsertNode(Info); 1822 (void)Existing; 1823 assert((!Existing || Existing->Function->isCanonicalDecl()) && 1824 "Set is supposed to only contain canonical decls"); 1825 } 1826} 1827 1828void 1829FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context, 1830 const UnresolvedSetImpl &Templates, 1831 const TemplateArgumentListInfo &TemplateArgs) { 1832 assert(TemplateOrSpecialization.isNull()); 1833 size_t Size = sizeof(DependentFunctionTemplateSpecializationInfo); 1834 Size += Templates.size() * sizeof(FunctionTemplateDecl*); 1835 Size += TemplateArgs.size() * sizeof(TemplateArgumentLoc); 1836 void *Buffer = Context.Allocate(Size); 1837 DependentFunctionTemplateSpecializationInfo *Info = 1838 new (Buffer) DependentFunctionTemplateSpecializationInfo(Templates, 1839 TemplateArgs); 1840 TemplateOrSpecialization = Info; 1841} 1842 1843DependentFunctionTemplateSpecializationInfo:: 1844DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts, 1845 const TemplateArgumentListInfo &TArgs) 1846 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) { 1847 1848 d.NumTemplates = Ts.size(); 1849 d.NumArgs = TArgs.size(); 1850 1851 FunctionTemplateDecl **TsArray = 1852 const_cast<FunctionTemplateDecl**>(getTemplates()); 1853 for (unsigned I = 0, E = Ts.size(); I != E; ++I) 1854 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl()); 1855 1856 TemplateArgumentLoc *ArgsArray = 1857 const_cast<TemplateArgumentLoc*>(getTemplateArgs()); 1858 for (unsigned I = 0, E = TArgs.size(); I != E; ++I) 1859 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]); 1860} 1861 1862TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const { 1863 // For a function template specialization, query the specialization 1864 // information object. 1865 FunctionTemplateSpecializationInfo *FTSInfo 1866 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>(); 1867 if (FTSInfo) 1868 return FTSInfo->getTemplateSpecializationKind(); 1869 1870 MemberSpecializationInfo *MSInfo 1871 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>(); 1872 if (MSInfo) 1873 return MSInfo->getTemplateSpecializationKind(); 1874 1875 return TSK_Undeclared; 1876} 1877 1878void 1879FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK, 1880 SourceLocation PointOfInstantiation) { 1881 if (FunctionTemplateSpecializationInfo *FTSInfo 1882 = TemplateOrSpecialization.dyn_cast< 1883 FunctionTemplateSpecializationInfo*>()) { 1884 FTSInfo->setTemplateSpecializationKind(TSK); 1885 if (TSK != TSK_ExplicitSpecialization && 1886 PointOfInstantiation.isValid() && 1887 FTSInfo->getPointOfInstantiation().isInvalid()) 1888 FTSInfo->setPointOfInstantiation(PointOfInstantiation); 1889 } else if (MemberSpecializationInfo *MSInfo 1890 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) { 1891 MSInfo->setTemplateSpecializationKind(TSK); 1892 if (TSK != TSK_ExplicitSpecialization && 1893 PointOfInstantiation.isValid() && 1894 MSInfo->getPointOfInstantiation().isInvalid()) 1895 MSInfo->setPointOfInstantiation(PointOfInstantiation); 1896 } else 1897 assert(false && "Function cannot have a template specialization kind"); 1898} 1899 1900SourceLocation FunctionDecl::getPointOfInstantiation() const { 1901 if (FunctionTemplateSpecializationInfo *FTSInfo 1902 = TemplateOrSpecialization.dyn_cast< 1903 FunctionTemplateSpecializationInfo*>()) 1904 return FTSInfo->getPointOfInstantiation(); 1905 else if (MemberSpecializationInfo *MSInfo 1906 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) 1907 return MSInfo->getPointOfInstantiation(); 1908 1909 return SourceLocation(); 1910} 1911 1912bool FunctionDecl::isOutOfLine() const { 1913 if (Decl::isOutOfLine()) 1914 return true; 1915 1916 // If this function was instantiated from a member function of a 1917 // class template, check whether that member function was defined out-of-line. 1918 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) { 1919 const FunctionDecl *Definition; 1920 if (FD->hasBody(Definition)) 1921 return Definition->isOutOfLine(); 1922 } 1923 1924 // If this function was instantiated from a function template, 1925 // check whether that function template was defined out-of-line. 1926 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) { 1927 const FunctionDecl *Definition; 1928 if (FunTmpl->getTemplatedDecl()->hasBody(Definition)) 1929 return Definition->isOutOfLine(); 1930 } 1931 1932 return false; 1933} 1934 1935//===----------------------------------------------------------------------===// 1936// FieldDecl Implementation 1937//===----------------------------------------------------------------------===// 1938 1939FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC, 1940 SourceLocation L, IdentifierInfo *Id, QualType T, 1941 TypeSourceInfo *TInfo, Expr *BW, bool Mutable) { 1942 return new (C) FieldDecl(Decl::Field, DC, L, Id, T, TInfo, BW, Mutable); 1943} 1944 1945bool FieldDecl::isAnonymousStructOrUnion() const { 1946 if (!isImplicit() || getDeclName()) 1947 return false; 1948 1949 if (const RecordType *Record = getType()->getAs<RecordType>()) 1950 return Record->getDecl()->isAnonymousStructOrUnion(); 1951 1952 return false; 1953} 1954 1955unsigned FieldDecl::getFieldIndex() const { 1956 if (CachedFieldIndex) return CachedFieldIndex - 1; 1957 1958 unsigned index = 0; 1959 RecordDecl::field_iterator 1960 i = getParent()->field_begin(), e = getParent()->field_end(); 1961 while (true) { 1962 assert(i != e && "failed to find field in parent!"); 1963 if (*i == this) 1964 break; 1965 1966 ++i; 1967 ++index; 1968 } 1969 1970 CachedFieldIndex = index + 1; 1971 return index; 1972} 1973 1974//===----------------------------------------------------------------------===// 1975// TagDecl Implementation 1976//===----------------------------------------------------------------------===// 1977 1978SourceLocation TagDecl::getOuterLocStart() const { 1979 return getTemplateOrInnerLocStart(this); 1980} 1981 1982SourceRange TagDecl::getSourceRange() const { 1983 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation(); 1984 return SourceRange(getOuterLocStart(), E); 1985} 1986 1987TagDecl* TagDecl::getCanonicalDecl() { 1988 return getFirstDeclaration(); 1989} 1990 1991void TagDecl::setTypedefForAnonDecl(TypedefDecl *TDD) { 1992 TypedefDeclOrQualifier = TDD; 1993 if (TypeForDecl) 1994 const_cast<Type*>(TypeForDecl)->ClearLinkageCache(); 1995 ClearLinkageCache(); 1996} 1997 1998void TagDecl::startDefinition() { 1999 IsBeingDefined = true; 2000 2001 if (isa<CXXRecordDecl>(this)) { 2002 CXXRecordDecl *D = cast<CXXRecordDecl>(this); 2003 struct CXXRecordDecl::DefinitionData *Data = 2004 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D); 2005 for (redecl_iterator I = redecls_begin(), E = redecls_end(); I != E; ++I) 2006 cast<CXXRecordDecl>(*I)->DefinitionData = Data; 2007 } 2008} 2009 2010void TagDecl::completeDefinition() { 2011 assert((!isa<CXXRecordDecl>(this) || 2012 cast<CXXRecordDecl>(this)->hasDefinition()) && 2013 "definition completed but not started"); 2014 2015 IsDefinition = true; 2016 IsBeingDefined = false; 2017 2018 if (ASTMutationListener *L = getASTMutationListener()) 2019 L->CompletedTagDefinition(this); 2020} 2021 2022TagDecl* TagDecl::getDefinition() const { 2023 if (isDefinition()) 2024 return const_cast<TagDecl *>(this); 2025 if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(this)) 2026 return CXXRD->getDefinition(); 2027 2028 for (redecl_iterator R = redecls_begin(), REnd = redecls_end(); 2029 R != REnd; ++R) 2030 if (R->isDefinition()) 2031 return *R; 2032 2033 return 0; 2034} 2035 2036void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) { 2037 if (QualifierLoc) { 2038 // Make sure the extended qualifier info is allocated. 2039 if (!hasExtInfo()) 2040 TypedefDeclOrQualifier = new (getASTContext()) ExtInfo; 2041 // Set qualifier info. 2042 getExtInfo()->QualifierLoc = QualifierLoc; 2043 } 2044 else { 2045 // Here Qualifier == 0, i.e., we are removing the qualifier (if any). 2046 if (hasExtInfo()) { 2047 getASTContext().Deallocate(getExtInfo()); 2048 TypedefDeclOrQualifier = (TypedefDecl*) 0; 2049 } 2050 } 2051} 2052 2053//===----------------------------------------------------------------------===// 2054// EnumDecl Implementation 2055//===----------------------------------------------------------------------===// 2056 2057EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L, 2058 IdentifierInfo *Id, SourceLocation TKL, 2059 EnumDecl *PrevDecl, bool IsScoped, 2060 bool IsScopedUsingClassTag, bool IsFixed) { 2061 EnumDecl *Enum = new (C) EnumDecl(DC, L, Id, PrevDecl, TKL, 2062 IsScoped, IsScopedUsingClassTag, IsFixed); 2063 C.getTypeDeclType(Enum, PrevDecl); 2064 return Enum; 2065} 2066 2067EnumDecl *EnumDecl::Create(ASTContext &C, EmptyShell Empty) { 2068 return new (C) EnumDecl(0, SourceLocation(), 0, 0, SourceLocation(), 2069 false, false, false); 2070} 2071 2072void EnumDecl::completeDefinition(QualType NewType, 2073 QualType NewPromotionType, 2074 unsigned NumPositiveBits, 2075 unsigned NumNegativeBits) { 2076 assert(!isDefinition() && "Cannot redefine enums!"); 2077 if (!IntegerType) 2078 IntegerType = NewType.getTypePtr(); 2079 PromotionType = NewPromotionType; 2080 setNumPositiveBits(NumPositiveBits); 2081 setNumNegativeBits(NumNegativeBits); 2082 TagDecl::completeDefinition(); 2083} 2084 2085//===----------------------------------------------------------------------===// 2086// RecordDecl Implementation 2087//===----------------------------------------------------------------------===// 2088 2089RecordDecl::RecordDecl(Kind DK, TagKind TK, DeclContext *DC, SourceLocation L, 2090 IdentifierInfo *Id, RecordDecl *PrevDecl, 2091 SourceLocation TKL) 2092 : TagDecl(DK, TK, DC, L, Id, PrevDecl, TKL) { 2093 HasFlexibleArrayMember = false; 2094 AnonymousStructOrUnion = false; 2095 HasObjectMember = false; 2096 LoadedFieldsFromExternalStorage = false; 2097 assert(classof(static_cast<Decl*>(this)) && "Invalid Kind!"); 2098} 2099 2100RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC, 2101 SourceLocation L, IdentifierInfo *Id, 2102 SourceLocation TKL, RecordDecl* PrevDecl) { 2103 2104 RecordDecl* R = new (C) RecordDecl(Record, TK, DC, L, Id, PrevDecl, TKL); 2105 C.getTypeDeclType(R, PrevDecl); 2106 return R; 2107} 2108 2109RecordDecl *RecordDecl::Create(const ASTContext &C, EmptyShell Empty) { 2110 return new (C) RecordDecl(Record, TTK_Struct, 0, SourceLocation(), 0, 0, 2111 SourceLocation()); 2112} 2113 2114bool RecordDecl::isInjectedClassName() const { 2115 return isImplicit() && getDeclName() && getDeclContext()->isRecord() && 2116 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName(); 2117} 2118 2119RecordDecl::field_iterator RecordDecl::field_begin() const { 2120 if (hasExternalLexicalStorage() && !LoadedFieldsFromExternalStorage) 2121 LoadFieldsFromExternalStorage(); 2122 2123 return field_iterator(decl_iterator(FirstDecl)); 2124} 2125 2126/// completeDefinition - Notes that the definition of this type is now 2127/// complete. 2128void RecordDecl::completeDefinition() { 2129 assert(!isDefinition() && "Cannot redefine record!"); 2130 TagDecl::completeDefinition(); 2131} 2132 2133void RecordDecl::LoadFieldsFromExternalStorage() const { 2134 ExternalASTSource *Source = getASTContext().getExternalSource(); 2135 assert(hasExternalLexicalStorage() && Source && "No external storage?"); 2136 2137 // Notify that we have a RecordDecl doing some initialization. 2138 ExternalASTSource::Deserializing TheFields(Source); 2139 2140 llvm::SmallVector<Decl*, 64> Decls; 2141 if (Source->FindExternalLexicalDeclsBy<FieldDecl>(this, Decls)) 2142 return; 2143 2144#ifndef NDEBUG 2145 // Check that all decls we got were FieldDecls. 2146 for (unsigned i=0, e=Decls.size(); i != e; ++i) 2147 assert(isa<FieldDecl>(Decls[i])); 2148#endif 2149 2150 LoadedFieldsFromExternalStorage = true; 2151 2152 if (Decls.empty()) 2153 return; 2154 2155 llvm::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls); 2156} 2157 2158//===----------------------------------------------------------------------===// 2159// BlockDecl Implementation 2160//===----------------------------------------------------------------------===// 2161 2162void BlockDecl::setParams(ParmVarDecl **NewParamInfo, 2163 unsigned NParms) { 2164 assert(ParamInfo == 0 && "Already has param info!"); 2165 2166 // Zero params -> null pointer. 2167 if (NParms) { 2168 NumParams = NParms; 2169 void *Mem = getASTContext().Allocate(sizeof(ParmVarDecl*)*NumParams); 2170 ParamInfo = new (Mem) ParmVarDecl*[NumParams]; 2171 memcpy(ParamInfo, NewParamInfo, sizeof(ParmVarDecl*)*NumParams); 2172 } 2173} 2174 2175void BlockDecl::setCaptures(ASTContext &Context, 2176 const Capture *begin, 2177 const Capture *end, 2178 bool capturesCXXThis) { 2179 CapturesCXXThis = capturesCXXThis; 2180 2181 if (begin == end) { 2182 NumCaptures = 0; 2183 Captures = 0; 2184 return; 2185 } 2186 2187 NumCaptures = end - begin; 2188 2189 // Avoid new Capture[] because we don't want to provide a default 2190 // constructor. 2191 size_t allocationSize = NumCaptures * sizeof(Capture); 2192 void *buffer = Context.Allocate(allocationSize, /*alignment*/sizeof(void*)); 2193 memcpy(buffer, begin, allocationSize); 2194 Captures = static_cast<Capture*>(buffer); 2195} 2196 2197SourceRange BlockDecl::getSourceRange() const { 2198 return SourceRange(getLocation(), Body? Body->getLocEnd() : getLocation()); 2199} 2200 2201//===----------------------------------------------------------------------===// 2202// Other Decl Allocation/Deallocation Method Implementations 2203//===----------------------------------------------------------------------===// 2204 2205TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) { 2206 return new (C) TranslationUnitDecl(C); 2207} 2208 2209LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC, 2210 SourceLocation IdentL, IdentifierInfo *II) { 2211 return new (C) LabelDecl(DC, IdentL, II, 0, IdentL); 2212} 2213 2214LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC, 2215 SourceLocation IdentL, IdentifierInfo *II, 2216 SourceLocation GnuLabelL) { 2217 assert(GnuLabelL != IdentL && "Use this only for GNU local labels"); 2218 return new (C) LabelDecl(DC, IdentL, II, 0, GnuLabelL); 2219} 2220 2221 2222NamespaceDecl *NamespaceDecl::Create(ASTContext &C, DeclContext *DC, 2223 SourceLocation L, IdentifierInfo *Id) { 2224 return new (C) NamespaceDecl(DC, L, Id); 2225} 2226 2227NamespaceDecl *NamespaceDecl::getNextNamespace() { 2228 return dyn_cast_or_null<NamespaceDecl>( 2229 NextNamespace.get(getASTContext().getExternalSource())); 2230} 2231 2232ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC, 2233 SourceLocation loc, 2234 IdentifierInfo *name, 2235 QualType type) { 2236 return new (C) ImplicitParamDecl(DC, loc, name, type); 2237} 2238 2239FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC, 2240 const DeclarationNameInfo &NameInfo, 2241 QualType T, TypeSourceInfo *TInfo, 2242 StorageClass S, StorageClass SCAsWritten, 2243 bool isInlineSpecified, 2244 bool hasWrittenPrototype) { 2245 FunctionDecl *New = new (C) FunctionDecl(Function, DC, NameInfo, T, TInfo, 2246 S, SCAsWritten, isInlineSpecified); 2247 New->HasWrittenPrototype = hasWrittenPrototype; 2248 return New; 2249} 2250 2251BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) { 2252 return new (C) BlockDecl(DC, L); 2253} 2254 2255EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD, 2256 SourceLocation L, 2257 IdentifierInfo *Id, QualType T, 2258 Expr *E, const llvm::APSInt &V) { 2259 return new (C) EnumConstantDecl(CD, L, Id, T, E, V); 2260} 2261 2262IndirectFieldDecl * 2263IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L, 2264 IdentifierInfo *Id, QualType T, NamedDecl **CH, 2265 unsigned CHS) { 2266 return new (C) IndirectFieldDecl(DC, L, Id, T, CH, CHS); 2267} 2268 2269SourceRange EnumConstantDecl::getSourceRange() const { 2270 SourceLocation End = getLocation(); 2271 if (Init) 2272 End = Init->getLocEnd(); 2273 return SourceRange(getLocation(), End); 2274} 2275 2276TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC, 2277 SourceLocation L, IdentifierInfo *Id, 2278 TypeSourceInfo *TInfo) { 2279 return new (C) TypedefDecl(DC, L, Id, TInfo); 2280} 2281 2282FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC, 2283 StringLiteral *Str, 2284 SourceLocation AsmLoc, 2285 SourceLocation RParenLoc) { 2286 return new (C) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc); 2287} 2288