SemaDecl.cpp revision 23a48cc69e7ed4f219996a8864cb7d3f24f1157f
15f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 25f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 35f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// The LLVM Compiler Infrastructure 45f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 75f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 85f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 95f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// This file implements semantic analysis for declarations. 115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "Sema.h" 15bd3606426d389370616126af969904ec493cb105Chris Lattner#include "clang/AST/APValue.h" 165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/AST/ASTConsumer.h" 173d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman#include "clang/AST/ASTContext.h" 180dbe227feccf6a8dbadfff8ca3f80416b7bf2f28Daniel Dunbar#include "clang/AST/DeclObjC.h" 196c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne#include "clang/AST/DeclTemplate.h" 204c40d98ab7acf5f27fa89b17bd8fc0ef7683df37John McCall#include "clang/AST/ExprCXX.h" 21af2f62ce32e462f256855cd24b06dec4755d2827Daniel Dunbar#include "clang/Parse/DeclSpec.h" 228c25fc584ce27d59df9923f153e8a132dde58d04Peter Collingbourne#include "clang/Basic/TargetInfo.h" 2382d0a418c8699fc6f4a9417457ffe93d43bba1c1Anton Korobeynikov#include "clang/Basic/SourceManager.h" 2406057cef0bcd7804e80f3ce2bbe352178396c715Chandler Carruth// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Lex/Preprocessor.h" 26687cc4a850b59116efee061018f0d8df50728b82Ken Dyck#include "clang/Lex/HeaderSearch.h" 27c4a1dea2dc56bd1357ec91b829a0b9e68229a13eDaniel Dunbar#include "llvm/ADT/SmallSet.h" 2821ef7ae45c8b91f23cf5eab2263421bb398a644bChris Lattner#include "llvm/ADT/STLExtras.h" 29af896897f7485176f43d40c4adced7efb0fb2b06Douglas Gregor#include <algorithm> 3014110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne#include <functional> 311a5e0d7f18485e4fb958f96dcddff3e4486a4069Anders Carlssonusing namespace clang; 32a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola 332c8569d5f43f7de1fb993e84c95ea571dd9ac55eChris Lattner/// getDeclName - Return a pretty name for the specified decl if possible, or 348bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman/// an empty string if not. This is used for pretty crash reporting. 355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstd::string Sema::getDeclName(DeclPtrTy d) { 36e9b7d8ace8674585818990cff585daae7745bd88Steve Naroff Decl *D = d.getAs<Decl>(); 37ec9426ca6039279bcc99bc2c625bb2abe4f0353dNate Begeman if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 38bef20ac367a09555b30d6eb3847a81ec164caf88Chris Lattner return DN->getQualifiedNameAsString(); 395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return ""; 40d5b8902c0329d80a216803b58dc3b689349a0c11Chris Lattner} 416374c3307e2d73348f7b8cc73eeeb0998ad0ac94John McCall 42c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael EspindolaSema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 4320ff3108fcd2c3bd734dc79efc22ebaa090abd41Anton Korobeynikov return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 446ba728d9687b2617793f5afd410650a8d6c71080Gabor Greif} 4578f7ece00e2ddfb64d4ed72a7be770b5b9b805e3Chris Lattner 465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// \brief If the identifier refers to a type name within this scope, 475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// return the declaration of that type. 485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 4977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge/// This routine performs ordinary name lookup of the identifier II 5077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge/// within the given scope, with optional C++ scope specifier SS, to 51f16aa103d3afd42fbca2ab346f191bf745cec092John McCall/// determine whether the name refers to a type. If so, returns an 52bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor/// opaque pointer (actually a QualType) corresponding to that 53f16aa103d3afd42fbca2ab346f191bf745cec092John McCall/// type. Otherwise, returns NULL. 54f16aa103d3afd42fbca2ab346f191bf745cec092John McCall/// 55f16aa103d3afd42fbca2ab346f191bf745cec092John McCall/// If name lookup results in an ambiguity, this routine will complain 56f16aa103d3afd42fbca2ab346f191bf745cec092John McCall/// and then return NULL. 57f16aa103d3afd42fbca2ab346f191bf745cec092John McCallSema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 58f16aa103d3afd42fbca2ab346f191bf745cec092John McCall Scope *S, const CXXScopeSpec *SS) { 59f16aa103d3afd42fbca2ab346f191bf745cec092John McCall // C++ [temp.res]p3: 60f16aa103d3afd42fbca2ab346f191bf745cec092John McCall // A qualified-id that refers to a type and in which the 61f16aa103d3afd42fbca2ab346f191bf745cec092John McCall // nested-name-specifier depends on a template-parameter (14.6.2) 625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // shall be prefixed by the keyword typename to indicate that the 632811ccf48d6d898c42cc4cfad37abedb36236d20Chandler Carruth // qualified-id denotes a type, forming an 64468ec6c0266e48fccb26ce50d5b915c645bb3c7bJohn McCall // elaborated-type-specifier (7.1.5.3). 65d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie // 66d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall // We therefore do not perform any name lookup up SS is a dependent 67468ec6c0266e48fccb26ce50d5b915c645bb3c7bJohn McCall // scope name. FIXME: we will need to perform a special kind of 68f16aa103d3afd42fbca2ab346f191bf745cec092John McCall // lookup if the scope specifier names a member of the current 6908d4792bb5d9e0e7f122c6273636807029c06aaaDaniel Dunbar // instantiation. 703d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman if (SS && isDependentScopeSpecifier(*SS)) 716c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne return 0; 726c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne 736c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne NamedDecl *IIDecl = 0; 74673431a2986f750b4d8fadb57abf3f00db27bbbdDaniel Dunbar LookupResult Result = LookupParsedName(S, SS, &II, LookupOrdinaryName, 75673431a2986f750b4d8fadb57abf3f00db27bbbdDaniel Dunbar false, false); 76d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall switch (Result.getKind()) { 77d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall case LookupResult::NotFound: 7860be607e5d71627bf3dab8f51c3fdca74267c692David Chisnall case LookupResult::FoundOverloaded: 798c25fc584ce27d59df9923f153e8a132dde58d04Peter Collingbourne return 0; 808c25fc584ce27d59df9923f153e8a132dde58d04Peter Collingbourne 818c25fc584ce27d59df9923f153e8a132dde58d04Peter Collingbourne case LookupResult::AmbiguousBaseSubobjectTypes: 826c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne case LookupResult::AmbiguousBaseSubobjects: 836c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne case LookupResult::AmbiguousReference: { 84e8b9f5b8ea60983c4a74cb8b63879616b914b65aSanjiv Gupta // Look to see if we have a type anywhere in the list of results. 853d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 863d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman Res != ResEnd; ++Res) { 870b5c4fc2ae3b503c2b1f354bf52b718aa50a6aeeDan Gohman if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 880b5c4fc2ae3b503c2b1f354bf52b718aa50a6aeeDan Gohman if (!IIDecl || 893d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman (*Res)->getLocation().getRawEncoding() < 90e8ba8d78a258ec992d3521eebdae8324db777b14Nick Lewycky IIDecl->getLocation().getRawEncoding()) 91e8ba8d78a258ec992d3521eebdae8324db777b14Nick Lewycky IIDecl = *Res; 92e8ba8d78a258ec992d3521eebdae8324db777b14Nick Lewycky } 93e8ba8d78a258ec992d3521eebdae8324db777b14Nick Lewycky } 94e8ba8d78a258ec992d3521eebdae8324db777b14Nick Lewycky 95d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall if (!IIDecl) { 96d16c2cf1cafa413709aa487cbbd5dc392f1ba1ffJohn McCall // None of the entities we found is a type, so there is no way 975936e33bf74dd6bf126ceee0f6169a2593d03a69John McCall // to even assume that the result is a type. In this case, don't 98f85e193739c953358c865005855253af4f68a497John McCall // complain about the ambiguity. The parser will either try to 99f85e193739c953358c865005855253af4f68a497John McCall // perform this lookup again (e.g., as an object name), which 100f85e193739c953358c865005855253af4f68a497John McCall // will produce the ambiguity, or will complain that it expected 101f85e193739c953358c865005855253af4f68a497John McCall // a type name. 1025936e33bf74dd6bf126ceee0f6169a2593d03a69John McCall Result.Destroy(); 1035936e33bf74dd6bf126ceee0f6169a2593d03a69John McCall return 0; 1040774cb84719f2aea3016493a2bbd9a02aa3e0541John McCall } 1050774cb84719f2aea3016493a2bbd9a02aa3e0541John McCall 1060774cb84719f2aea3016493a2bbd9a02aa3e0541John McCall // We found a type within the ambiguous lookup; diagnose the 1070774cb84719f2aea3016493a2bbd9a02aa3e0541John McCall // ambiguity and then return that type. This might be the right 108bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor // answer, or it might not be, but it suppresses any attempt to 10934695856c0e67b3765b46304cc71b5d2cd5b71c7John McCall // perform the name lookup again. 110bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 111bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor break; 1125936e33bf74dd6bf126ceee0f6169a2593d03a69John McCall } 1135936e33bf74dd6bf126ceee0f6169a2593d03a69John McCall 1145936e33bf74dd6bf126ceee0f6169a2593d03a69John McCall case LookupResult::Found: 1152b94fe35edf951a14ecd32b21f7ebcc2e3754c67Chris Lattner IIDecl = Result.getAsDecl(); 1162b94fe35edf951a14ecd32b21f7ebcc2e3754c67Chris Lattner break; 1172b94fe35edf951a14ecd32b21f7ebcc2e3754c67Chris Lattner } 118e926523105dd2604ccd5c101605dea43c5269965Peter Collingbourne 1198c25fc584ce27d59df9923f153e8a132dde58d04Peter Collingbourne if (IIDecl) { 1206c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne QualType T; 1210628b724ff68105dc88af00a39f859447f22981eTed Kremenek 122f16aa103d3afd42fbca2ab346f191bf745cec092John McCall if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 1234376c85fb0ac9e7fd779d246efc77e1169179138Dan Gohman // Check whether we can use this type 124815c78fd9ab8bd5dfe8e8a91b8c6a413e2b8c889Ted Kremenek (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 125f85e193739c953358c865005855253af4f68a497John McCall 126f85e193739c953358c865005855253af4f68a497John McCall T = Context.getTypeDeclType(TD); 127815c78fd9ab8bd5dfe8e8a91b8c6a413e2b8c889Ted Kremenek } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 128815c78fd9ab8bd5dfe8e8a91b8c6a413e2b8c889Ted Kremenek // Check whether we can use this interface. 1290d13f6fdbdd6f06e2449b8834dda53334abd399aDavid Chisnall (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 1300d13f6fdbdd6f06e2449b8834dda53334abd399aDavid Chisnall 131e926523105dd2604ccd5c101605dea43c5269965Peter Collingbourne T = Context.getObjCInterfaceType(IDecl); 1320d13f6fdbdd6f06e2449b8834dda53334abd399aDavid Chisnall } else 133e926523105dd2604ccd5c101605dea43c5269965Peter Collingbourne return 0; 1340d13f6fdbdd6f06e2449b8834dda53334abd399aDavid Chisnall 1350d13f6fdbdd6f06e2449b8834dda53334abd399aDavid Chisnall if (SS) 1368c25fc584ce27d59df9923f153e8a132dde58d04Peter Collingbourne T = getQualifiedNameType(*SS, T); 1378c25fc584ce27d59df9923f153e8a132dde58d04Peter Collingbourne 1388c25fc584ce27d59df9923f153e8a132dde58d04Peter Collingbourne return T.getAsOpaquePtr(); 1398c25fc584ce27d59df9923f153e8a132dde58d04Peter Collingbourne } 1406c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne 1416c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne return 0; 1426c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne} 1436c0aa5ff6e6253db0f993053599e2a52b5b93b2dPeter Collingbourne 144815c78fd9ab8bd5dfe8e8a91b8c6a413e2b8c889Ted Kremenek/// isTagName() - This method is called *for error recovery purposes only* 14582227ff4eb665bbf41720ebdc0dc9215a86ba838Chris Lattner/// to determine if the specified name is a valid tag name ("struct foo"). If 1466c6bda3b0b1d8adaac2ba3f4da7056e9f1eef52eEli Friedman/// so, this returns the TST for the tag corresponding to it (TST_enum, 147efb0fa9e11f75af51744a6159530ef7cc8efa24aDaniel Dunbar/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 148e926523105dd2604ccd5c101605dea43c5269965Peter Collingbourne/// where the user forgot to specify the tag. 149e926523105dd2604ccd5c101605dea43c5269965Peter CollingbourneDeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 150208ff5e8a073de2a5d15cbe03cab8a4c0d935e28Daniel Dunbar // Do a tag name lookup in this scope. 1516bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar LookupResult R = LookupName(S, &II, LookupTagName, false, false); 1526bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar if (R.getKind() == LookupResult::Found) 15377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) { 1540269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar switch (TD->getTagKind()) { 155744016dde06fcffd50931e94a98c850f8b12cd87John McCall case TagDecl::TK_struct: return DeclSpec::TST_struct; 156b25938303de0976b9f189363d43033e5788e3d36John McCall case TagDecl::TK_union: return DeclSpec::TST_union; 157b25938303de0976b9f189363d43033e5788e3d36John McCall case TagDecl::TK_class: return DeclSpec::TST_class; 158744016dde06fcffd50931e94a98c850f8b12cd87John McCall case TagDecl::TK_enum: return DeclSpec::TST_enum; 159744016dde06fcffd50931e94a98c850f8b12cd87John McCall } 1605ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky } 1615ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky 1623dc05418538c719fea48b906bfa4febe5296e126Nick Lewycky return DeclSpec::TST_unspecified; 163f391dbe39dca85f2a2c6ea558811dacc571c223eDevang Patel} 164f391dbe39dca85f2a2c6ea558811dacc571c223eDevang Patel 165f391dbe39dca85f2a2c6ea558811dacc571c223eDevang Patel 166f1968f28869f4e0675450ae39c478a37c5b9abd6Daniel Dunbar 167f1968f28869f4e0675450ae39c478a37c5b9abd6Daniel DunbarDeclContext *Sema::getContainingDC(DeclContext *DC) { 168e80d56771736c85fd8365c394a6731923b17e91dDevang Patel if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 169e80d56771736c85fd8365c394a6731923b17e91dDevang Patel // A C++ out-of-line method will return to the file declaration context. 170e80d56771736c85fd8365c394a6731923b17e91dDevang Patel if (MD->isOutOfLineDefinition()) 171e80d56771736c85fd8365c394a6731923b17e91dDevang Patel return MD->getLexicalDeclContext(); 172e80d56771736c85fd8365c394a6731923b17e91dDevang Patel 173e80d56771736c85fd8365c394a6731923b17e91dDevang Patel // A C++ inline method is parsed *after* the topmost class it was declared 174e80d56771736c85fd8365c394a6731923b17e91dDevang Patel // in is fully parsed (it's "complete"). 1753d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman // The parsing of a C++ inline method happens at the declaration context of 1763d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman // the topmost (non-nested) class it is lexically declared in. 1773d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 1783d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman DC = MD->getParent(); 1793d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 1803d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman DC = RD; 1813d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman 1823d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman // Return the declaration context of the topmost class the inline method is 1833d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman // declared in. 1843d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman return DC; 1853d5aff5d3036b0ff09d114857cd2276134b3d8c9Dan Gohman } 1866374c3307e2d73348f7b8cc73eeeb0998ad0ac94John McCall 187bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor if (isa<ObjCMethodDecl>(DC)) 1886374c3307e2d73348f7b8cc73eeeb0998ad0ac94John McCall return Context.getTranslationUnitDecl(); 1896374c3307e2d73348f7b8cc73eeeb0998ad0ac94John McCall 1905f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner return DC->getLexicalParent(); 191d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie} 19232096695c76033a6b0b1747c439f7378a11e8312John McCall 19332096695c76033a6b0b1747c439f7378a11e8312John McCallvoid Sema::PushDeclContext(Scope *S, DeclContext *DC) { 19432096695c76033a6b0b1747c439f7378a11e8312John McCall assert(getContainingDC(DC) == CurContext && 195488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar "The next DeclContext should be lexically contained in the current one."); 1962c8569d5f43f7de1fb993e84c95ea571dd9ac55eChris Lattner CurContext = DC; 19790df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar S->setEntity(DC); 19890df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar} 19990df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar 20090df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbarvoid Sema::PopDeclContext() { 201d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie assert(CurContext && "DeclContext imbalance!"); 20256b8001b42bd603ef593e3cb278d8b9b9ba26ca9Daniel Dunbar 2032c8569d5f43f7de1fb993e84c95ea571dd9ac55eChris Lattner CurContext = getContainingDC(CurContext); 2040a14eee528a901c16f0e288fbc10a3abc1660d87Chris Lattner} 2050a14eee528a901c16f0e288fbc10a3abc1660d87Chris Lattner 2062c8569d5f43f7de1fb993e84c95ea571dd9ac55eChris Lattner/// \brief Determine whether we allow overloading of the function 20758c3f9ec11cbe852a518bf2f83af46f938b7b852Chris Lattner/// PrevDecl with another declaration. 208488e993a135ce700b982bf099c3d6b856301d642Daniel Dunbar/// 209c6fdc34ac0183bfa03d65f317c78b7bdac52897eChris Lattner/// This routine determines whether overloading is possible, not 21090df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar/// whether some new function is actually an overload. It will return 21190df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar/// true in C++ (where we can always provide overloads) or, as an 21290df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar/// extension, in C when the previous function is already an 21390df4b6661968a84bf64baee489bb2f6d948fcc1Daniel Dunbar/// overloaded function declaration or has the "overloadable" 214d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie/// attribute. 21556b8001b42bd603ef593e3cb278d8b9b9ba26ca9Daniel Dunbarstatic bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 216c6fdc34ac0183bfa03d65f317c78b7bdac52897eChris Lattner if (Context.getLangOptions().CPlusPlus) 2170a14eee528a901c16f0e288fbc10a3abc1660d87Chris Lattner return true; 218c6fdc34ac0183bfa03d65f317c78b7bdac52897eChris Lattner 219c6fdc34ac0183bfa03d65f317c78b7bdac52897eChris Lattner if (isa<OverloadedFunctionDecl>(PrevDecl)) 220bc8d40d85f3fa1e34569834916f18fecaa635152John McCall return true; 221bc8d40d85f3fa1e34569834916f18fecaa635152John McCall 222bc8d40d85f3fa1e34569834916f18fecaa635152John McCall return PrevDecl->getAttr<OverloadableAttr>() != 0; 223bc8d40d85f3fa1e34569834916f18fecaa635152John McCall} 2241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2250ffeaad72cb335b926b064379be4c9886bbff004Anders Carlsson/// Add this decl to the scope shadowed decl chains. 22604d4078425614bf9fd58d606335c1f5f74ee7fa4Daniel Dunbarvoid Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 227df102fcb978588d5edbc661fb5da0b6922f9ab1cChris Lattner // Move up the scope chain until we find the nearest enclosing 2287e714cd931fa3a90bfd728318a92485aa3e95748Daniel Dunbar // non-transparent context. The declaration will be introduced into this 2296ab187a49a42de6d351248d8a6e0206e39743a0cDaniel Dunbar // scope. 2307e714cd931fa3a90bfd728318a92485aa3e95748Daniel Dunbar while (S->getEntity() && 2316ab187a49a42de6d351248d8a6e0206e39743a0cDaniel Dunbar ((DeclContext *)S->getEntity())->isTransparentContext()) 232af14603ca61757cf4361b583b45639a04c57e651John McCall S = S->getParent(); 233af14603ca61757cf4361b583b45639a04c57e651John McCall 234c7c9058f4977ef4584d68718e23f34504b150ef4Fariborz Jahanian S->AddDecl(DeclPtrTy::make(D)); 235c7c9058f4977ef4584d68718e23f34504b150ef4Fariborz Jahanian 2367cd2e93125e2f3b6ca01b24ed0c3fd7e94683fd9Fariborz Jahanian // Add scoped declarations into their context, so that they can be 2377cd2e93125e2f3b6ca01b24ed0c3fd7e94683fd9Fariborz Jahanian // found later. Declarations without a context won't be inserted 238cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // into any context. 239cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall CurContext->addDecl(Context, D); 240cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall 241cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // C++ [basic.scope]p4: 242fa2e99f72f9bfe2270ea8caf76d0eef11c45259fAnders Carlsson // -- exactly one declaration shall declare a class name or 2430ffeaad72cb335b926b064379be4c9886bbff004Anders Carlsson // enumeration name that is not a typedef name and the other 244cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // declarations shall all refer to the same object or 245279b5eb6910d64a293e9c0e2887a05c65d8737d7John McCall // enumerator, or all refer to functions and function templates; 246279b5eb6910d64a293e9c0e2887a05c65d8737d7John McCall // in this case the class name or enumeration name is hidden. 247279b5eb6910d64a293e9c0e2887a05c65d8737d7John McCall if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 2489a86a137b0872bad25161fb3408a71d919638757Anders Carlsson // We are pushing the name of a tag (enum or class). 2499a86a137b0872bad25161fb3408a71d919638757Anders Carlsson if (CurContext->getLookupContext() 2509a86a137b0872bad25161fb3408a71d919638757Anders Carlsson == TD->getDeclContext()->getLookupContext()) { 2519a86a137b0872bad25161fb3408a71d919638757Anders Carlsson // We're pushing the tag into the current context, which might 252cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // require some reshuffling in the identifier resolver. 253cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall IdentifierResolver::iterator 254cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall I = IdResolver.begin(TD->getDeclName()), 255cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall IEnd = IdResolver.end(); 2567a536907da776bdc47a704e7cafd641e8150e653John McCall if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 2577a536907da776bdc47a704e7cafd641e8150e653John McCall NamedDecl *PrevDecl = *I; 2587a536907da776bdc47a704e7cafd641e8150e653John McCall for (; I != IEnd && isDeclInScope(*I, CurContext, S); 259cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall PrevDecl = *I, ++I) { 260f502d93b0ea970bfbd897e657f8d940a20984de2Anders Carlsson if (TD->declarationReplaces(*I)) { 261cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // This is a redeclaration. Remove it from the chain and 262cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // break out, so that we'll add in the shadowed 263cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // declaration. 264cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall S->RemoveDecl(DeclPtrTy::make(*I)); 2654421d2b341d041df44013769f23c306308bbab83Douglas Gregor if (PrevDecl == *I) { 266cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall IdResolver.RemoveDecl(*I); 267cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall IdResolver.AddDecl(TD); 268cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall return; 269cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall } else { 270cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall IdResolver.RemoveDecl(*I); 271cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall break; 272cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall } 273cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall } 274cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall } 2757a536907da776bdc47a704e7cafd641e8150e653John McCall 276cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // There is already a declaration with the same name in the same 277cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // scope, which is not a tag declaration. It must be found 278cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // before we find the new declaration, so insert the new 2797a536907da776bdc47a704e7cafd641e8150e653John McCall // declaration at the end of the chain. 2807a536907da776bdc47a704e7cafd641e8150e653John McCall IdResolver.AddShadowedDecl(TD, PrevDecl); 2817a536907da776bdc47a704e7cafd641e8150e653John McCall 2827a536907da776bdc47a704e7cafd641e8150e653John McCall return; 2837a536907da776bdc47a704e7cafd641e8150e653John McCall } 2847a536907da776bdc47a704e7cafd641e8150e653John McCall } 2857a536907da776bdc47a704e7cafd641e8150e653John McCall } else if (isa<FunctionDecl>(D) && 286cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall AllowOverloadingOfFunction(D, Context)) { 287279b5eb6910d64a293e9c0e2887a05c65d8737d7John McCall // We are pushing the name of a function, which might be an 2887a536907da776bdc47a704e7cafd641e8150e653John McCall // overloaded name. 289cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall FunctionDecl *FD = cast<FunctionDecl>(D); 290cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall IdentifierResolver::iterator Redecl 291cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall = std::find_if(IdResolver.begin(FD->getDeclName()), 292cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall IdResolver.end(), 293cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 294cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall FD)); 295fa2e99f72f9bfe2270ea8caf76d0eef11c45259fAnders Carlsson if (Redecl != IdResolver.end() && 296cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall S->isDeclScope(DeclPtrTy::make(*Redecl))) { 297cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall // There is already a declaration of a function on our 298fa2e99f72f9bfe2270ea8caf76d0eef11c45259fAnders Carlsson // IdResolver chain. Replace it with this declaration. 299cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall S->RemoveDecl(DeclPtrTy::make(*Redecl)); 300cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall IdResolver.RemoveDecl(*Redecl); 301cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall } 302b1c65ff108de47a89585ad37874bd6cb232664cdRafael Espindola } 303cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall 304cbfe50224b19119e759802bd0c1463269dffd09eJohn McCall IdResolver.AddDecl(D); 3055f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner} 306793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson 307793a990774826a0c20b0da66cec0991badfb8b63Anders Carlssonvoid Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 3085f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (S->decl_empty()) return; 309793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 310793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson "Scope shouldn't contain decls!"); 311793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson 3124c40d98ab7acf5f27fa89b17bd8fc0ef7683df37John McCall for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 313793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson I != E; ++I) { 314793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson Decl *TmpD = (*I).getAs<Decl>(); 315793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson assert(TmpD && "This decl didn't get pushed??"); 316793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson 317793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 318793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson NamedDecl *D = cast<NamedDecl>(TmpD); 319793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson 320793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson if (!D->getDeclName()) continue; 321c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola 322793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson // Remove this name from our lexical scope. 323c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola IdResolver.RemoveDecl(D); 324793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson } 325c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola} 326793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson 327c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 328793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson/// return 0 if one not found. 329c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael EspindolaObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 330793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson // The third "scope" argument is 0 since we aren't enabling lazy built-in 331793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson // creation from this context. 332c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 333793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson 334793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 335793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson} 336793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson 3375f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner/// getNonFieldDeclScope - Retrieves the innermost scope, starting 338793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson/// from S, where a non-field would be declared. This routine copes 339793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson/// with the difference between C and C++ scoping rules in structs and 340793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson/// unions. For example, the following code is well-formed in C but 341793a990774826a0c20b0da66cec0991badfb8b63Anders Carlsson/// ill-formed in C++: 34214110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne/// @code 34314110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne/// struct S6 { 34414110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne/// enum { BAR } e; 34514110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne/// }; 346c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola/// 34714110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne/// void test_S6() { 348c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola/// struct S6 a; 34914110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne/// a.e = BAR; 350c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola/// } 35114110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne/// @endcode 352c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola/// For the declaration of BAR, this routine will return a different 35314110477887e3dc168ffc6c191e72d705051f99ePeter Collingbourne/// scope. The scope S will be the scope of the unnamed enumeration 354c4850c2aa4c281a352e228aafc51fb1e30dcad02Rafael Espindola/// within S6. In C++, this routine will return the scope associated 3559a8822bb154b792cdb18fe4cfb34480ca0ec7661Anders Carlsson/// with S6, because the enumeration's scope is a transparent 3569a8822bb154b792cdb18fe4cfb34480ca0ec7661Anders Carlsson/// context but structures can contain non-field names. In C, this 3575f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner/// routine will return the translation unit scope, since the 358f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall/// enumeration's scope is a transparent context and structures cannot 3595f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas Gregor/// contain non-field names. 3605f2bfd4811996abb783aa6c7254c56baa6930e8cDouglas GregorScope *Sema::getNonFieldDeclScope(Scope *S) { 3616d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner while (((S->getFlags() & Scope::DeclScope) == 0) || 3626d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner (S->getEntity() && 3636bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar ((DeclContext *)S->getEntity())->isTransparentContext()) || 36449988884c1da4b2200bfe2298a1e41b3f044e8d4Daniel Dunbar (S->isClassScope() && !getLangOptions().CPlusPlus)) 3656bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar S = S->getParent(); 3666d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner return S; 3676d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner} 3686bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar 3696bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbarvoid Sema::InitBuiltinVaListType() { 3706bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar if (!Context.getBuiltinVaListType().isNull()) 37149988884c1da4b2200bfe2298a1e41b3f044e8d4Daniel Dunbar return; 3726bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar 3736bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 3746bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 3756bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 3766bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 3770774cb84719f2aea3016493a2bbd9a02aa3e0541John McCall} 37896e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson 3796bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 3806bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar/// file scope. lazily create a decl for it. ForRedeclaration is true 381c5cbb909e8a27deb8f1a2b6b7bf56a96051af81aChris Lattner/// if we're creating this built-in in anticipation of redeclaring the 3827650d95a1a616ea300f37126a8dfc93dc19a662aChris Lattner/// built-in. 38396e0fc726c6fe7538522c60743705d5e696b40afOwen AndersonNamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 3846bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar Scope *S, bool ForRedeclaration, 3856bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar SourceLocation Loc) { 3866bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar Builtin::ID BID = (Builtin::ID)bid; 3876bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar 3886bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar if (Context.BuiltinInfo.hasVAListUse(BID)) 3891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump InitBuiltinVaListType(); 3900032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson 3913c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson Builtin::Context::GetBuiltinTypeError Error; 39208e252425ca2cbdc44ba65d9a657ed5398014e36Owen Anderson QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context, Error); 3936bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar switch (Error) { 3946bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar case Builtin::Context::GE_None: 3956bfed7e411adc46eaf616371f85f68305c6e6257Daniel Dunbar // Okay 39696e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson break; 3971c431b323d776362490bbf7cc796b74fedaf19f2Owen Anderson 398572cf09ae8a78af1c56d40b016ec4cf1837163acChris Lattner case Builtin::Context::GE_Missing_FILE: 3997db6d838aad4083fe86d7bf703a75fe6e8a17856Owen Anderson if (ForRedeclaration) 4001c431b323d776362490bbf7cc796b74fedaf19f2Owen Anderson Diag(Loc, diag::err_implicit_decl_requires_stdio) 4016d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner << Context.BuiltinInfo.GetName(BID); 4026d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner return 0; 4036d39760673df2e92d9293f46ff8c66dad6ab5e0aChris Lattner } 404d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 405d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 40690e99a84ddd020e8fda79643748243725a2ed071Argyrios Kyrtzidis Diag(Loc, diag::ext_implicit_lib_function_decl) 4077c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar << Context.BuiltinInfo.GetName(BID) 408f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner << R; 409d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (Context.BuiltinInfo.getHeaderName(BID) && 410f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 411f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner != Diagnostic::Ignored) 412d46f98573ba104eda102dd3224b2dca69f1c6336John McCall Diag(Loc, diag::note_please_include_header) 413f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner << Context.BuiltinInfo.getHeaderName(BID) 414f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner << Context.BuiltinInfo.GetName(BID); 415d46f98573ba104eda102dd3224b2dca69f1c6336John McCall } 416f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner 417f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner FunctionDecl *New = FunctionDecl::Create(Context, 418f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner Context.getTranslationUnitDecl(), 419f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner Loc, II, R, 420fd0f89d3d7e4220327abdec1cb115474d70219dcFariborz Jahanian FunctionDecl::Extern, false, 4215584d91c938384b57563edbca5c2d4f1c66ff02aJohn McCall /*hasPrototype=*/true); 4225584d91c938384b57563edbca5c2d4f1c66ff02aJohn McCall New->setImplicit(); 4235584d91c938384b57563edbca5c2d4f1c66ff02aJohn McCall 4245584d91c938384b57563edbca5c2d4f1c66ff02aJohn McCall // Create Decl objects for each parameter, adding them to the 4255584d91c938384b57563edbca5c2d4f1c66ff02aJohn McCall // FunctionDecl. 4265584d91c938384b57563edbca5c2d4f1c66ff02aJohn McCall if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 427f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner llvm::SmallVector<ParmVarDecl*, 16> Params; 428f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 429f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 430f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner FT->getArgType(i), VarDecl::None, 0)); 431f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner New->setParams(Context, &Params[0], Params.size()); 432f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner } 433f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner 434142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian AddKnownFunctionAttributes(New); 435142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian 436142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian // TUScope is the translation-unit scope to insert this function into. 437f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner // FIXME: This is hideous. We need to teach PushOnScopeChains to 438f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner // relate Scopes to DeclContexts, and probably eliminate CurContext 439f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner // entirely, but we're not there yet. 440f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner DeclContext *SavedContext = CurContext; 441f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner CurContext = Context.getTranslationUnitDecl(); 442f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner PushOnScopeChains(New, TUScope); 443142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian CurContext = SavedContext; 444142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian return New; 4455584d91c938384b57563edbca5c2d4f1c66ff02aJohn McCall} 446f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner 447f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 448f815306571385e2892e079a409f1b5b11f5e5cbbChris Lattner/// everything from the standard library is defined. 449f815306571385e2892e079a409f1b5b11f5e5cbbChris LattnerNamespaceDecl *Sema::GetStdNamespace() { 450d46f98573ba104eda102dd3224b2dca69f1c6336John McCall if (!StdNamespace) { 451d4cbda6292b321c2e7dce7f039d92918fee99b3aNuno Lopes IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 452d46f98573ba104eda102dd3224b2dca69f1c6336John McCall DeclContext *Global = Context.getTranslationUnitDecl(); 453d46f98573ba104eda102dd3224b2dca69f1c6336John McCall Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 454d46f98573ba104eda102dd3224b2dca69f1c6336John McCall StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 455d46f98573ba104eda102dd3224b2dca69f1c6336John McCall } 456d46f98573ba104eda102dd3224b2dca69f1c6336John McCall return StdNamespace; 457d46f98573ba104eda102dd3224b2dca69f1c6336John McCall} 458d46f98573ba104eda102dd3224b2dca69f1c6336John McCall 4597c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 460d4cbda6292b321c2e7dce7f039d92918fee99b3aNuno Lopes/// same name and scope as a previous declaration 'Old'. Figure out 461d4cbda6292b321c2e7dce7f039d92918fee99b3aNuno Lopes/// how to resolve this situation, merging decls or emitting 4627dbd8197040313d796282d4af06eccdf8a17319cDaniel Dunbar/// diagnostics as appropriate. Returns true if there was an error, 4631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// false otherwise. 4647dbd8197040313d796282d4af06eccdf8a17319cDaniel Dunbar/// 465ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbarbool Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 466761d7f78e2dac7ea5f35828c2271e60d91e106ceDevang Patel bool objc_types = false; 467ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbar // Allow multiple definitions for ObjC built-in typedefs. 468761d7f78e2dac7ea5f35828c2271e60d91e106ceDevang Patel // FIXME: Verify the underlying types are equivalent! 469ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbar if (getLangOptions().ObjC1) { 470ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbar const IdentifierInfo *TypeID = New->getIdentifier(); 471f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar switch (TypeID->getLength()) { 472f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar default: break; 473d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall case 2: 474d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall if (!TypeID->isStr("id")) 475d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall break; 476d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall Context.setObjCIdType(New); 477d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall objc_types = true; 478d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall break; 479d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall case 5: 480d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall if (!TypeID->isStr("Class")) 481d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall break; 482d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall Context.setObjCClassType(New); 483d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall objc_types = true; 484d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall return false; 485d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall case 3: 486d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall if (!TypeID->isStr("SEL")) 487d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall break; 488d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall Context.setObjCSelType(New); 489d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall objc_types = true; 490d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall return false; 491d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall case 8: 492d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall if (!TypeID->isStr("Protocol")) 4937c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar break; 4947c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar Context.setObjCProtoType(New->getUnderlyingType()); 495abca5a1b3e74e644e297c7590b46ab73a6bb476aRafael Espindola objc_types = true; 496abca5a1b3e74e644e297c7590b46ab73a6bb476aRafael Espindola return false; 497abca5a1b3e74e644e297c7590b46ab73a6bb476aRafael Espindola } 498d1e40d5389a4382cbebc97d54792f41ee0414af4John McCall // Fall through - the typedef name was not a builtin type. 4991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 500af668b0e7d3581dea3b4f29a9262686e83887e5bDaniel Dunbar // Verify the old decl was also a type. 5012873aee1774a2ae731d6cc5c5ee05ba82780dc98Eli Friedman TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 5022873aee1774a2ae731d6cc5c5ee05ba82780dc98Eli Friedman if (!Old) { 503dd0cb22bd62e1e835327f478a2dbf0b8fa439713Daniel Dunbar Diag(New->getLocation(), diag::err_redefinition_different_kind) 5042873aee1774a2ae731d6cc5c5ee05ba82780dc98Eli Friedman << New->getDeclName(); 5052873aee1774a2ae731d6cc5c5ee05ba82780dc98Eli Friedman if (!objc_types) 506dd0cb22bd62e1e835327f478a2dbf0b8fa439713Daniel Dunbar Diag(OldD->getLocation(), diag::note_previous_definition); 5071feade8e520be483293dbf55eb57a51720899589Mike Stump return true; 50881ebbde0fb30a40df0f5e913d8a1f71c383d271aAnders Carlsson } 509f55314dce992fd60816ba337ad151a2fb7c42239Mike Stump 5102873aee1774a2ae731d6cc5c5ee05ba82780dc98Eli Friedman // Determine the "old" type we'll use for checking and diagnostics. 5112873aee1774a2ae731d6cc5c5ee05ba82780dc98Eli Friedman QualType OldType; 5122873aee1774a2ae731d6cc5c5ee05ba82780dc98Eli Friedman if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 5132873aee1774a2ae731d6cc5c5ee05ba82780dc98Eli Friedman OldType = OldTypedef->getUnderlyingType(); 5142873aee1774a2ae731d6cc5c5ee05ba82780dc98Eli Friedman else 515c5f657fe308f22243f674fc1dfbe24915944d8bfRafael Espindola OldType = Context.getTypeDeclType(Old); 516c5f657fe308f22243f674fc1dfbe24915944d8bfRafael Espindola 517c5f657fe308f22243f674fc1dfbe24915944d8bfRafael Espindola // If the typedef types are not identical, reject them in all languages and 518e289d81369914678db386f6aa86faf8f178e245dDouglas Gregor // with any extensions enabled. 519fd015353a3c4f528216276f25df5b4d464d7a0cdAnders Carlsson 520e289d81369914678db386f6aa86faf8f178e245dDouglas Gregor if (OldType != New->getUnderlyingType() && 521fd015353a3c4f528216276f25df5b4d464d7a0cdAnders Carlsson Context.getCanonicalType(OldType) != 522fd015353a3c4f528216276f25df5b4d464d7a0cdAnders Carlsson Context.getCanonicalType(New->getUnderlyingType())) { 523cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt Diag(New->getLocation(), diag::err_redefinition_different_typedef) 524cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt << New->getUnderlyingType() << OldType; 525cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt if (!objc_types) 526cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt Diag(Old->getLocation(), diag::note_previous_definition); 527fb51ddfafcd5f8536d0312b3daa3c0b74b90ab5bMike Stump return true; 528bd6dbd19781cefd5b5ff9750c8bf86e6c341a68cMike Stump } 529bd6dbd19781cefd5b5ff9750c8bf86e6c341a68cMike Stump if (objc_types) return false; 530f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar if (getLangOptions().Microsoft) return false; 531f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar 5321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // C++ [dcl.typedef]p2: 5337c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // In a given non-class scope, a typedef specifier can be used to 534934176f27552141b5ad113cb3603ffb14906c570Anders Carlsson // redefine the name of any type declared in that scope to refer 535934176f27552141b5ad113cb3603ffb14906c570Anders Carlsson // to the type to which it already refers. 5361fb0caaa7bef765b85972274e3b434af2572c141John McCall if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 5371fb0caaa7bef765b85972274e3b434af2572c141John McCall return false; 5387c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 53940b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 5407c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 5417c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // *either* declaration is in a system header. The code below implements 54240b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis // this adhoc compatibility rule. FIXME: The following code will not 5437c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // work properly when compiling ".i" files (containing preprocessed output). 54482d0a418c8699fc6f4a9417457ffe93d43bba1c1Anton Korobeynikov if (PP.getDiagnostics().getSuppressSystemWarnings()) { 54582d0a418c8699fc6f4a9417457ffe93d43bba1c1Anton Korobeynikov SourceManager &SrcMgr = Context.getSourceManager(); 5467c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (SrcMgr.isInSystemHeader(Old->getLocation())) 5477c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar return false; 5480e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar if (SrcMgr.isInSystemHeader(New->getLocation())) 5490e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar return false; 5500e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar } 5510e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar 5520e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 5537c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar Diag(Old->getLocation(), diag::note_previous_definition); 5547c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar return true; 5557c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar} 5560e4f40e1bbc4dce16bbb9870300a435419f1b3d5Daniel Dunbar 557f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar/// DeclhasAttr - returns true if decl Declaration already has the target 558f80519b919a348db004fba18530706314d1ebfb5Daniel Dunbar/// attribute. 559b2bcf1c176b200b36f371e189ce22f93c86cdf45Anders Carlssonstatic bool DeclHasAttr(const Decl *decl, const Attr *target) { 560c6c14d1cd68afcd90d097715296377f15be45210Eli Friedman for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 561c6c14d1cd68afcd90d097715296377f15be45210Eli Friedman if (attr->getKind() == target->getKind()) 5620ac2cf4d28e1ed92508b27a3d9e28fc8db2a390bPeter Collingbourne return true; 5630ac2cf4d28e1ed92508b27a3d9e28fc8db2a390bPeter Collingbourne 5640ac2cf4d28e1ed92508b27a3d9e28fc8db2a390bPeter Collingbourne return false; 5650ac2cf4d28e1ed92508b27a3d9e28fc8db2a390bPeter Collingbourne} 5660ac2cf4d28e1ed92508b27a3d9e28fc8db2a390bPeter Collingbourne 5670ac2cf4d28e1ed92508b27a3d9e28fc8db2a390bPeter Collingbourne/// MergeAttributes - append attributes from the Old decl to the New one. 5680ac2cf4d28e1ed92508b27a3d9e28fc8db2a390bPeter Collingbournestatic void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 569b2bcf1c176b200b36f371e189ce22f93c86cdf45Anders Carlsson Attr *attr = const_cast<Attr*>(Old->getAttrs()); 570b2bcf1c176b200b36f371e189ce22f93c86cdf45Anders Carlsson 571c6c14d1cd68afcd90d097715296377f15be45210Eli Friedman while (attr) { 572b2bcf1c176b200b36f371e189ce22f93c86cdf45Anders Carlsson Attr *tmp = attr; 5731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump attr = attr->getNext(); 5747c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 5757c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (!DeclHasAttr(New, tmp) && tmp->isMerged()) { 5761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump tmp->setInherited(true); 57740b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis New->addAttr(tmp); 5787c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar } else { 5791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump tmp->setNext(0); 5800a0d2b179085a52c10402feebeb6db8b4d96a140Douglas Gregor tmp->Destroy(C); 5817c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar } 5821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 5837c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 5847c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar Old->invalidateAttrs(); 5851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump} 586af14603ca61757cf4361b583b45639a04c57e651John McCall 587af14603ca61757cf4361b583b45639a04c57e651John McCall/// Used in MergeFunctionDecl to keep track of function parameters in 588af14603ca61757cf4361b583b45639a04c57e651John McCall/// C. 589af14603ca61757cf4361b583b45639a04c57e651John McCallstruct GNUCompatibleParamWarning { 590af14603ca61757cf4361b583b45639a04c57e651John McCall ParmVarDecl *OldParm; 5917c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar ParmVarDecl *NewParm; 5927c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar QualType PromotedType; 59340b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis}; 5947c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 595219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar/// MergeFunctionDecl - We just parsed a function 'New' from 596219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar/// declarator D which has the same name and scope as a previous 5970269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar/// declaration 'Old'. Figure out how to resolve this situation, 5981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// merging decls or emitting diagnostics as appropriate. 5990269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar/// 60035f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner/// In C++, New and Old must be declarations that are not 6010269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar/// overloaded. Use IsOverload to determine whether New and Old are 6020269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar/// overloaded, and to select the Old declaration that New should be 6030269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar/// merged with. 6040269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar/// 605ad64e024bd18cf25dcfa44e049004371838decd8Chris Lattner/// Returns true if there was an error, false otherwise. 6060269871c9cba493f76237175ab60313406f3bafaDaniel Dunbarbool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 6070269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar assert(!isa<OverloadedFunctionDecl>(OldD) && 6082acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner "Cannot merge with an overloaded function declaration"); 6091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 61035f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner // Verify the old decl was also a function. 61135f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 61235f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner if (!Old) { 61335f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner Diag(New->getLocation(), diag::err_redefinition_different_kind) 6141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << New->getDeclName(); 6151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(OldD->getLocation(), diag::note_previous_definition); 616a1cf15f4680e5cf39e72e28c5ea854fcba792e84Owen Anderson return true; 61735f38a2c22d68c22e2dbe8e9ee84c120c8f327bbChris Lattner } 6181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 619c38e9affd4519ea199af22419c8c794973cc4b23Fariborz Jahanian // Determine whether the previous declaration was a definition, 620c38e9affd4519ea199af22419c8c794973cc4b23Fariborz Jahanian // implicit declaration, or a declaration. 62196e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson diag::kind PrevDiag; 6221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (Old->isThisDeclarationADefinition()) 6231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump PrevDiag = diag::note_previous_definition; 6241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump else if (Old->isImplicit()) 6250269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar PrevDiag = diag::note_previous_implicit_declaration; 6267db6d838aad4083fe86d7bf703a75fe6e8a17856Owen Anderson else 6271c431b323d776362490bbf7cc796b74fedaf19f2Owen Anderson PrevDiag = diag::note_previous_declaration; 6280269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar 6290269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar QualType OldQType = Context.getCanonicalType(Old->getType()); 6300269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar QualType NewQType = Context.getCanonicalType(New->getType()); 6310269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar 6320269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 63367b00520c8f5b48fad722b790d87fea6be764efeChris Lattner New->getStorageClass() == FunctionDecl::Static && 63467b00520c8f5b48fad722b790d87fea6be764efeChris Lattner Old->getStorageClass() != FunctionDecl::Static) { 635dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky Diag(New->getLocation(), diag::err_static_non_static) 636bbf58bb1b8dd8c5e0f07547a6c20ffd55385fcf6Rafael Espindola << New; 637046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson Diag(Old->getLocation(), PrevDiag); 638046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson return true; 639046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson } 640046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson 641046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson if (getLangOptions().CPlusPlus) { 642bbf58bb1b8dd8c5e0f07547a6c20ffd55385fcf6Rafael Espindola // (C++98 13.1p2): 643bbf58bb1b8dd8c5e0f07547a6c20ffd55385fcf6Rafael Espindola // Certain function declarations cannot be overloaded: 644bbf58bb1b8dd8c5e0f07547a6c20ffd55385fcf6Rafael Espindola // -- Function declarations that differ only in the return type 6452a131fbca2a51085dc083b8c56a2d4ced3cf1413Anders Carlsson // cannot be overloaded. 64667b00520c8f5b48fad722b790d87fea6be764efeChris Lattner QualType OldReturnType 64767b00520c8f5b48fad722b790d87fea6be764efeChris Lattner = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 648c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall QualType NewReturnType 649c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 650c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall if (OldReturnType != NewReturnType) { 651c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall Diag(New->getLocation(), diag::err_ovl_diff_return_type); 652c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 653c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall return true; 654c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall } 655c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall 6565f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 657f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 65867b00520c8f5b48fad722b790d87fea6be764efeChris Lattner if (OldMethod && NewMethod && 6591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump OldMethod->getLexicalDeclContext() == 66067b00520c8f5b48fad722b790d87fea6be764efeChris Lattner NewMethod->getLexicalDeclContext()) { 66167b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // -- Member function declarations with the same name and the 6621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // same parameter types cannot be overloaded if any of them 663c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall // is a static member function declaration. 664c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall if (OldMethod->isStatic() || NewMethod->isStatic()) { 665c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 666c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 667c76702cc80c1ef8a94d82b62ddcb4ed4f67d5b8cJohn McCall return true; 66867b00520c8f5b48fad722b790d87fea6be764efeChris Lattner } 66967b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 67067b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // C++ [class.mem]p1: 6715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // [...] A member shall not be declared twice in the 6725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // member-specification, except that a nested class or member 67377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // class template can be declared and then later defined. 67477f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge unsigned NewDiag; 67577f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge if (isa<CXXConstructorDecl>(OldMethod)) 67677f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge NewDiag = diag::err_constructor_redeclared; 67777f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge else if (isa<CXXDestructorDecl>(NewMethod)) 67877f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge NewDiag = diag::err_destructor_redeclared; 67977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge else if (isa<CXXConversionDecl>(NewMethod)) 68077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge NewDiag = diag::err_conv_function_redeclared; 68177f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge else 68277f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge NewDiag = diag::err_member_redeclared; 68377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 68477f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge Diag(New->getLocation(), NewDiag); 68577f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 68677f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge } 68777f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 68877f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // (C++98 8.3.5p3): 68977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // All declarations for a function shall agree exactly in both the 69077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // return type and the parameter-type-list. 69177f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge if (OldQType == NewQType) 69277f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge return MergeCompatibleFunctionDecls(New, Old); 69377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 69477f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // Fall through for conflicting redeclarations and redefinitions. 69577f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge } 69677f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 69777f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // C: Function types need to be compatible, not identical. This handles 69877f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // duplicate function decls like "void f(int); void f(enum X);" properly. 69977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge if (!getLangOptions().CPlusPlus && 70077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge Context.typesAreCompatible(OldQType, NewQType)) { 70177f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 70277f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 70377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge const FunctionProtoType *OldProto = 0; 70477f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge if (isa<FunctionNoProtoType>(NewFuncType) && 70577f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 70677f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // The old declaration provided a function prototype, but the 70777f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // new declaration does not. Merge in the prototype. 70877f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 70977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge OldProto->arg_type_end()); 71077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge NewQType = Context.getFunctionType(NewFuncType->getResultType(), 71177f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge &ParamTypes[0], ParamTypes.size(), 71277f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge OldProto->isVariadic(), 71377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge OldProto->getTypeQuals()); 71477f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge New->setType(NewQType); 71577f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge New->setInheritedPrototype(); 71677f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 7171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Synthesize a parameter for each argument type. 7188bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman llvm::SmallVector<ParmVarDecl*, 16> Params; 71977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge for (FunctionProtoType::arg_type_iterator 72077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge ParamType = OldProto->arg_type_begin(), 72177f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge ParamEnd = OldProto->arg_type_end(); 72277f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge ParamType != ParamEnd; ++ParamType) { 72377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 7248bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman SourceLocation(), 0, 72557d5cee133495bc21d1abdbce45ab05a79274a23Daniel Dunbar *ParamType, VarDecl::None, 7268bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 0); 72777f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge Param->setImplicit(); 72877f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge Params.push_back(Param); 72977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge } 73077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 7318bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman New->setParams(Context, &Params[0], Params.size()); 732c5cbb909e8a27deb8f1a2b6b7bf56a96051af81aChris Lattner } 7338bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman 7348bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman return MergeCompatibleFunctionDecls(New, Old); 73577f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge } 73677f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 73777f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // GNU C permits a K&R definition to follow a prototype declaration 73877f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // if the declared types of the parameters in the K&R definition 73977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // match the types in the prototype declaration, even when the 74077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // promoted types of the parameters from the K&R definition differ 74177f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // from the types in the prototype. GCC then keeps the types from 74277f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // the prototype. 74377f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge if (!getLangOptions().CPlusPlus && 74477f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge !getLangOptions().NoExtensions && 745a6d6af308bfc9b72467b432a045a9fc6673e3821Argyrios Kyrtzidis Old->hasPrototype() && !New->hasPrototype() && 74690e99a84ddd020e8fda79643748243725a2ed071Argyrios Kyrtzidis New->getType()->getAsFunctionProtoType() && 74790e99a84ddd020e8fda79643748243725a2ed071Argyrios Kyrtzidis Old->getNumParams() == New->getNumParams()) { 748a6d6af308bfc9b72467b432a045a9fc6673e3821Argyrios Kyrtzidis llvm::SmallVector<QualType, 16> ArgTypes; 7490b6bc8bd7a1d2a7d7478d13d78cff94cacad61fcDouglas Gregor llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 7504ac7c0bb39696e92fd220118fedc484c09a69870Argyrios Kyrtzidis const FunctionProtoType *OldProto 75173241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar = Old->getType()->getAsFunctionProtoType(); 75273241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar const FunctionProtoType *NewProto 7536a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola = New->getType()->getAsFunctionProtoType(); 7546a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola 7556a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola // Determine whether this is the GNU C extension. 7566a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola bool GNUCompatible = 7572acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner Context.typesAreCompatible(OldProto->getResultType(), 7586a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola NewProto->getResultType()) && 7596a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola (OldProto->isVariadic() == NewProto->isVariadic()); 760f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall for (unsigned Idx = 0, End = Old->getNumParams(); 7616a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola GNUCompatible && Idx != End; ++Idx) { 7626a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola ParmVarDecl *OldParm = Old->getParamDecl(Idx); 7636a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola ParmVarDecl *NewParm = New->getParamDecl(Idx); 7641faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson if (Context.typesAreCompatible(OldParm->getType(), 7651faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson NewProto->getArgType(Idx))) { 7666a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola ArgTypes.push_back(NewParm->getType()); 767f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall } else if (Context.typesAreCompatible(OldParm->getType(), 7686a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola NewParm->getType())) { 7696a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola GNUCompatibleParamWarning Warn 7706a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola = { OldParm, NewParm, NewProto->getArgType(Idx) }; 7716a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola Warnings.push_back(Warn); 7726a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola ArgTypes.push_back(NewParm->getType()); 7736a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola } else 7746a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola GNUCompatible = false; 7756a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola } 7766a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola 7776a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola if (GNUCompatible) { 778b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 7794a6835e650ff24e19ce08a3bd347c0ad186777fdAnders Carlsson Diag(Warnings[Warn].NewParm->getLocation(), 7801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump diag::ext_param_promoted_not_compatible_with_prototype) 7816a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola << Warnings[Warn].PromotedType 7826a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola << Warnings[Warn].OldParm->getType(); 7836a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola Diag(Warnings[Warn].OldParm->getLocation(), 7846a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola diag::note_previous_declaration); 785bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner } 786bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner 78740b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis New->setType(Context.getFunctionType(NewProto->getResultType(), 788f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall &ArgTypes[0], ArgTypes.size(), 789219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar NewProto->isVariadic(), 790d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne NewProto->getTypeQuals())); 791d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne return MergeCompatibleFunctionDecls(New, Old); 792d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne } 793d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne 794d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne // Fall through to diagnose conflicting types. 795d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne } 796d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne 797d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne // A function that has already been declared has been redeclared or defined 798d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne // with a different type- show appropriate diagnostic 799d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 800d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne // The user has declared a builtin function with an incompatible 801d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne // signature. 802d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 803d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne // The function the user is redeclaring is a library-defined 804d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne // function like 'malloc' or 'printf'. Warn about the 805d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne // redeclaration, then pretend that we don't know about this 806d51e43af0b3a6897b971f316c4de2035ec82d1f2Peter Collingbourne // library built-in. 80767b00520c8f5b48fad722b790d87fea6be764efeChris Lattner Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 8085e1e1f95c98b1add70c238093bbd5dc8d4f9c4e9Daniel Dunbar Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 80973241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar << Old << Old->getType(); 810dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 811dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky Old->setInvalidDecl(); 812dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky return false; 813dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky } 814dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky 815dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky PrevDiag = diag::note_previous_builtin_declaration; 816dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky } 8175f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner 818dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 819dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 820dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky return true; 821dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky} 822dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky 82373241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar/// \brief Completes the merge of two function declarations that are 824dce67a70a86db8758c926a76fdd980f5369d5746Nick Lewycky/// known to be compatible. 8250269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar/// 8260269871c9cba493f76237175ab60313406f3bafaDaniel Dunbar/// This routine handles the merging of attributes and other 827bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar/// properties of function declarations form the old declaration to 828bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar/// the new declaration, once we know that New is in fact a 829a9a55c063e9e59c6ab0a6d7a21302660f7bde9f9Douglas Gregor/// redeclaration of Old. 83073241dfeb5c498255b662984cca369fd28ec3147Daniel Dunbar/// 8314c13b7a3973d2d263d9682d7b68fbfeb76334af5Nate Begeman/// \returns false 8324c13b7a3973d2d263d9682d7b68fbfeb76334af5Nate Begemanbool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 83367b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // Merge the attributes 83467b00520c8f5b48fad722b790d87fea6be764efeChris Lattner MergeAttributes(New, Old, Context); 8354357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner 8364357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner // Merge the storage class. 8374357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner New->setStorageClass(Old->getStorageClass()); 838bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar 839bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar // FIXME: need to implement inline semantics 840bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall 841bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall // Merge "pure" flag. 842bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall if (Old->isPure()) 843bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall New->setPure(); 844bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall 845bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall // Merge the "deleted" flag. 846bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall if (Old->isDeleted()) 847bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall New->setDeleted(); 8484357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner 8494357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner if (getLangOptions().CPlusPlus) 8504357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner return MergeCXXFunctionDecl(New, Old); 8515f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner 8524357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner return false; 8534357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner} 8544357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner 8554357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner/// MergeVarDecl - We just parsed a variable 'New' which has the same name 8564357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner/// and scope as a previous declaration 'Old'. Figure out how to resolve this 8574357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner/// situation, merging decls or emitting diagnostics as appropriate. 8584357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner/// 8594357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner/// Tentative definition rules (C99 6.9.2p2) are checked by 8604c13b7a3973d2d263d9682d7b68fbfeb76334af5Nate Begeman/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 8614c13b7a3973d2d263d9682d7b68fbfeb76334af5Nate Begeman/// definitions here, since the initializer hasn't been attached. 862a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola/// 863a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindolabool Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 864a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // Verify the old decl was also a variable. 865a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola VarDecl *Old = dyn_cast<VarDecl>(OldD); 866a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola if (!Old) { 867a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola Diag(New->getLocation(), diag::err_redefinition_different_kind) 868a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola << New->getDeclName(); 869a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola Diag(OldD->getLocation(), diag::note_previous_definition); 870a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola return true; 871a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola } 872a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola 873a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola MergeAttributes(New, Old, Context); 874a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola 875a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // Merge the types 876a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 877a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola if (MergedT.isNull()) { 878a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola Diag(New->getLocation(), diag::err_redefinition_different_type) 879a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola << New->getDeclName(); 880a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola Diag(Old->getLocation(), diag::note_previous_definition); 881a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola return true; 882a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola } 883a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola New->setType(MergedT); 884a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola 885a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 886a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola if (New->getStorageClass() == VarDecl::Static && 887a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 888a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 889a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola Diag(Old->getLocation(), diag::note_previous_definition); 890a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola return true; 891a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola } 892a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // C99 6.2.2p4: 893a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // For an identifier declared with the storage-class specifier 894a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // extern in a scope in which a prior declaration of that 895a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // identifier is visible,23) if the prior declaration specifies 896a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // internal or external linkage, the linkage of the identifier at 897a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // the later declaration is the same as the linkage specified at 898a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // the prior declaration. If no prior declaration is visible, or 899a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // if the prior declaration specifies no linkage, then the 900a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // identifier has external linkage. 901a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola if (New->hasExternalStorage() && Old->hasLinkage()) 902a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola /* Okay */; 903a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola else if (New->getStorageClass() != VarDecl::Static && 904cc4889f72ec68319969ba51e214d9940eb9327e5Rafael Espindola Old->getStorageClass() == VarDecl::Static) { 905cc4889f72ec68319969ba51e214d9940eb9327e5Rafael Espindola Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 906a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola Diag(Old->getLocation(), diag::note_previous_definition); 907a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola return true; 908a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola } 909a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola 910a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 911a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola 912cc4889f72ec68319969ba51e214d9940eb9327e5Rafael Espindola // FIXME: The test for external storage here seems wrong? We still 913a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola // need to check for mismatches. 914a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola if (!New->hasExternalStorage() && !New->isFileVarDecl() && 915b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner // Don't complain about out-of-line definitions of static members. 9164a6835e650ff24e19ce08a3bd347c0ad186777fdAnders Carlsson !(Old->getLexicalDeclContext()->isRecord() && 9171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump !New->getLexicalDeclContext()->isRecord())) { 918cb421fa690da545b58a720abe5f1c49b166dbde7Dan Gohman Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 9198e2efcc267ed12dc435782288b7f9a4a1bc56c72Anders Carlsson Diag(Old->getLocation(), diag::note_previous_definition); 9208e2efcc267ed12dc435782288b7f9a4a1bc56c72Anders Carlsson return true; 9218e2efcc267ed12dc435782288b7f9a4a1bc56c72Anders Carlsson } 92244eac33ae12df384f3f002102f919f603bee330fDouglas Gregor 92344eac33ae12df384f3f002102f919f603bee330fDouglas Gregor // Keep a chain of previous declarations. 92444eac33ae12df384f3f002102f919f603bee330fDouglas Gregor New->setPreviousDeclaration(Old); 925a411d2f1ed4598a7a96a7befe07a9d9ee1a6efdeRafael Espindola 92644eac33ae12df384f3f002102f919f603bee330fDouglas Gregor return false; 92744eac33ae12df384f3f002102f919f603bee330fDouglas Gregor} 92844eac33ae12df384f3f002102f919f603bee330fDouglas Gregor 9297dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedman/// CheckParmsForFunctionDef - Check that the parameters of the given 9307dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedman/// function are appropriate for the definition of a function. This 9317dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedman/// takes care of any checks that cannot be performed on the 9327dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedman/// declaration itself, e.g., that the types of each of the function 9337dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedman/// parameters are complete. 9347dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedmanbool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 9357dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedman bool HasInvalidParm = false; 9367dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedman for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 9377dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedman ParmVarDecl *Param = FD->getParamDecl(p); 93844eac33ae12df384f3f002102f919f603bee330fDouglas Gregor 93944eac33ae12df384f3f002102f919f603bee330fDouglas Gregor // C99 6.7.5.3p4: the parameters in a parameter type list in a 9407270ee4cd4794281c09dfb6931a98bbb2581ef02Anders Carlsson // function declarator that is part of a function definition of 9417dcdf5ba9324a9577461eae302e88fdd52e310c5Eli Friedman // that function shall not have incomplete type. 94244eac33ae12df384f3f002102f919f603bee330fDouglas Gregor // 943b5e8156ebd6accd27daeaae6971597c45d5e5139Chris Lattner // This is also C++ [dcl.fct]p6. 944b5e8156ebd6accd27daeaae6971597c45d5e5139Chris Lattner if (!Param->isInvalidDecl() && 94544eac33ae12df384f3f002102f919f603bee330fDouglas Gregor RequireCompleteType(Param->getLocation(), Param->getType(), 946b5e8156ebd6accd27daeaae6971597c45d5e5139Chris Lattner diag::err_typecheck_decl_incomplete_type)) { 947b5e8156ebd6accd27daeaae6971597c45d5e5139Chris Lattner Param->setInvalidDecl(); 948b5e8156ebd6accd27daeaae6971597c45d5e5139Chris Lattner HasInvalidParm = true; 9494357a8291d759f6f9c36d3edeee8476d3eaf0804Chris Lattner } 950b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie 951bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar // C99 6.9.1p5: If the declarator includes a parameter type list, the 952bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar // declaration of each parameter shall include an identifier. 95374391b48b4791cded373683a3baf67314f358d50Chris Lattner if (Param->getIdentifier() == 0 && 95474391b48b4791cded373683a3baf67314f358d50Chris Lattner !Param->isImplicit() && 95574391b48b4791cded373683a3baf67314f358d50Chris Lattner !getLangOptions().CPlusPlus) 95674391b48b4791cded373683a3baf67314f358d50Chris Lattner Diag(Param->getLocation(), diag::err_parameter_name_omitted); 95774391b48b4791cded373683a3baf67314f358d50Chris Lattner } 95874391b48b4791cded373683a3baf67314f358d50Chris Lattner 95974391b48b4791cded373683a3baf67314f358d50Chris Lattner return HasInvalidParm; 960f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall} 9615f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner 9622acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 963f85e193739c953358c865005855253af4f68a497John McCall/// no declarator (e.g. "struct foo;") is parsed. 964f85e193739c953358c865005855253af4f68a497John McCallSema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 9650558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner // FIXME: Error on auto/register at file scope 966f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall // FIXME: Error on inline/virtual/explicit 9670558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner // FIXME: Error on invalid restrict 9686a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola // FIXME: Warn on useless const/volatile 9696a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 9706a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola // FIXME: Warn on useless attributes 9717270ee4cd4794281c09dfb6931a98bbb2581ef02Anders Carlsson 9726a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola TagDecl *Tag = 0; 9736a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola if (DS.getTypeSpecType() == DeclSpec::TST_class || 9746a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola DS.getTypeSpecType() == DeclSpec::TST_struct || 9756a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola DS.getTypeSpecType() == DeclSpec::TST_union || 9760558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner DS.getTypeSpecType() == DeclSpec::TST_enum) 9770558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 9781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9790558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 9809cbe4f0ba01ec304e1e3d071c071f7bca33631c0Chris Lattner if (!Record->getDeclName() && Record->isDefinition() && 9810558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 9821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (getLangOptions().CPlusPlus || 983654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman Record->getDeclContext()->isRecord()) 984654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman return BuildAnonymousStructOrUnion(S, DS, Record); 985654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman 986654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 987784f21121a6c9418ebd86baa6814e36e1176c410John McCall << DS.getSourceRange(); 9882acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner } 989784f21121a6c9418ebd86baa6814e36e1176c410John McCall 990784f21121a6c9418ebd86baa6814e36e1176c410John McCall // Microsoft allows unnamed struct/union fields. Don't complain 991784f21121a6c9418ebd86baa6814e36e1176c410John McCall // about them. 9920774cb84719f2aea3016493a2bbd9a02aa3e0541John McCall // FIXME: Should we support Microsoft's extensions in this area? 993654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman if (Record->getDeclName() && getLangOptions().Microsoft) 994654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman return DeclPtrTy::make(Tag); 995bcaedaed309ce453a992fdeef4a4c908cc7d9dfbChris Lattner } 996784f21121a6c9418ebd86baa6814e36e1176c410John McCall 997654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman if (!DS.isMissingDeclaratorOk() && 998f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall DS.getTypeSpecType() != DeclSpec::TST_error) { 999f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall // Warn about typedefs of enums without names, since this is an 1000654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman // extension in both Microsoft an GNU. 1001b2bcf1c176b200b36f371e189ce22f93c86cdf45Anders Carlsson if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1002f85e193739c953358c865005855253af4f68a497John McCall Tag && isa<EnumDecl>(Tag)) { 1003f85e193739c953358c865005855253af4f68a497John McCall Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1004654ad40f27d684e8f3eddbc990247a6dbea5ddedEli Friedman << DS.getSourceRange(); 100567b00520c8f5b48fad722b790d87fea6be764efeChris Lattner return DeclPtrTy::make(Tag); 100667b00520c8f5b48fad722b790d87fea6be764efeChris Lattner } 100767b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 1008f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 100967b00520c8f5b48fad722b790d87fea6be764efeChris Lattner << DS.getSourceRange(); 101067b00520c8f5b48fad722b790d87fea6be764efeChris Lattner return DeclPtrTy(); 101167b00520c8f5b48fad722b790d87fea6be764efeChris Lattner } 101267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner 101367b00520c8f5b48fad722b790d87fea6be764efeChris Lattner return DeclPtrTy::make(Tag); 1014bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall} 1015bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall 1016bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1017bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// anonymous struct or union AnonRecord into the owning context Owner 1018bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// and scope S. This routine will be invoked just after we realize 1019bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// that an unnamed union or struct is actually an anonymous union or 1020bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// struct, e.g., 1021bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// 1022bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// @code 10231faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson/// union { 10241faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson/// int i; 10251faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson/// float f; 102601de7a44cea9f77cbcda65faad8edc8b48a3b617Rafael Espindola/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1027bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// // f into the surrounding scope.x 1028bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// @endcode 1029bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// 1030bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall/// This routine is recursive, injecting the names of nested anonymous 10311faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson/// structs/unions into the owning context and scope as well. 1032bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCallbool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1033a29bf41b8f49578207ce36f6b21ff9bb7ee77babDouglas Gregor RecordDecl *AnonRecord) { 1034bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall bool Invalid = false; 103510620eb5164e31208fcbf0437cd79ae535ed0559Sean Hunt for (RecordDecl::field_iterator F = AnonRecord->field_begin(Context), 1036a29bf41b8f49578207ce36f6b21ff9bb7ee77babDouglas Gregor FEnd = AnonRecord->field_end(Context); 1037bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall F != FEnd; ++F) { 1038bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall if ((*F)->getDeclName()) { 10397b9a5aa7c0d76f577699d25ce6afe21ecccb60b7Rafael Espindola NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1040bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall LookupOrdinaryName, true); 1041bfdcdc8e26097c9dbb4c40d78296f6ccc3e6684cJohn McCall if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 104267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // C++ [class.union]p2: 10431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // The names of the members of an anonymous union shall be 1044784f21121a6c9418ebd86baa6814e36e1176c410John McCall // distinct from the names of any other entity in the 1045784f21121a6c9418ebd86baa6814e36e1176c410John McCall // scope in which the anonymous union is declared. 1046784f21121a6c9418ebd86baa6814e36e1176c410John McCall unsigned diagKind 1047784f21121a6c9418ebd86baa6814e36e1176c410John McCall = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1048784f21121a6c9418ebd86baa6814e36e1176c410John McCall : diag::err_anonymous_struct_member_redecl; 1049784f21121a6c9418ebd86baa6814e36e1176c410John McCall Diag((*F)->getLocation(), diagKind) 10509cbe4f0ba01ec304e1e3d071c071f7bca33631c0Chris Lattner << (*F)->getDeclName(); 1051784f21121a6c9418ebd86baa6814e36e1176c410John McCall Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 10520558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner Invalid = true; 10530558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner } else { 105474391b48b4791cded373683a3baf67314f358d50Chris Lattner // C++ [class.union]p2: 105574391b48b4791cded373683a3baf67314f358d50Chris Lattner // For the purpose of name lookup, after the anonymous union 105674391b48b4791cded373683a3baf67314f358d50Chris Lattner // definition, the members of the anonymous union are 1057b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner // considered to have been defined in the scope in which the 10582acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner // anonymous union is declared. 10591faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson Owner->makeDeclVisibleInContext(Context, *F); 106074391b48b4791cded373683a3baf67314f358d50Chris Lattner S->AddDecl(DeclPtrTy::make(*F)); 106174391b48b4791cded373683a3baf67314f358d50Chris Lattner IdResolver.AddDecl(*F); 10624a6835e650ff24e19ce08a3bd347c0ad186777fdAnders Carlsson } 1063bcaedaed309ce453a992fdeef4a4c908cc7d9dfbChris Lattner } else if (const RecordType *InnerRecordType 10645f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner = (*F)->getType()->getAsRecordType()) { 10651faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson RecordDecl *InnerRecord = InnerRecordType->getDecl(); 106674391b48b4791cded373683a3baf67314f358d50Chris Lattner if (InnerRecord->isAnonymousStructOrUnion()) 106777ba708819285931932ecd33691a672bb59d221aEli Friedman Invalid = Invalid || 106874391b48b4791cded373683a3baf67314f358d50Chris Lattner InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 106974391b48b4791cded373683a3baf67314f358d50Chris Lattner } 107074391b48b4791cded373683a3baf67314f358d50Chris Lattner } 10712acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner 10725f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner return Invalid; 1073f85e193739c953358c865005855253af4f68a497John McCall} 1074f85e193739c953358c865005855253af4f68a497John McCall 1075f85e193739c953358c865005855253af4f68a497John McCall/// ActOnAnonymousStructOrUnion - Handle the declaration of an 107674391b48b4791cded373683a3baf67314f358d50Chris Lattner/// anonymous structure or union. Anonymous unions are a C++ feature 1077bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar/// (C++ [class.union]) and a GNU C extension; anonymous structures 1078da55074866ca2fe7f718c5d3334648d6e340fb15Douglas Gregor/// are a GNU C and GNU C++ extension. 1079da55074866ca2fe7f718c5d3334648d6e340fb15Douglas GregorSema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 108088786862424cb2d478516d911709dc19c962af9cJohn McCall RecordDecl *Record) { 108120e098b7e7fda6bed1d67441b56cce77cd3aa918Eli Friedman DeclContext *Owner = Record->getDeclContext(); 1082da55074866ca2fe7f718c5d3334648d6e340fb15Douglas Gregor 1083da55074866ca2fe7f718c5d3334648d6e340fb15Douglas Gregor // Diagnose whether this anonymous struct/union is an extension. 1084da55074866ca2fe7f718c5d3334648d6e340fb15Douglas Gregor if (Record->isUnion() && !getLangOptions().CPlusPlus) 1085da55074866ca2fe7f718c5d3334648d6e340fb15Douglas Gregor Diag(Record->getLocation(), diag::ext_anonymous_union); 10862bb110125e0e5adb7c1c65d12adfa34151ca1c47Douglas Gregor else if (!Record->isUnion()) 10872bb110125e0e5adb7c1c65d12adfa34151ca1c47Douglas Gregor Diag(Record->getLocation(), diag::ext_anonymous_struct); 10882bb110125e0e5adb7c1c65d12adfa34151ca1c47Douglas Gregor 108920e098b7e7fda6bed1d67441b56cce77cd3aa918Eli Friedman // C and C++ require different kinds of checks for anonymous 1090da55074866ca2fe7f718c5d3334648d6e340fb15Douglas Gregor // structs/unions. 109120e098b7e7fda6bed1d67441b56cce77cd3aa918Eli Friedman bool Invalid = false; 109220e098b7e7fda6bed1d67441b56cce77cd3aa918Eli Friedman if (getLangOptions().CPlusPlus) { 109320e098b7e7fda6bed1d67441b56cce77cd3aa918Eli Friedman const char* PrevSpec = 0; 109474391b48b4791cded373683a3baf67314f358d50Chris Lattner // C++ [class.union]p3: 109574391b48b4791cded373683a3baf67314f358d50Chris Lattner // Anonymous unions declared in a named namespace or in the 109674391b48b4791cded373683a3baf67314f358d50Chris Lattner // global namespace shall be declared static. 109774391b48b4791cded373683a3baf67314f358d50Chris Lattner if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 109874391b48b4791cded373683a3baf67314f358d50Chris Lattner (isa<TranslationUnitDecl>(Owner) || 109974391b48b4791cded373683a3baf67314f358d50Chris Lattner (isa<NamespaceDecl>(Owner) && 110074391b48b4791cded373683a3baf67314f358d50Chris Lattner cast<NamespaceDecl>(Owner)->getDeclName()))) { 1101f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 11025f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner Invalid = true; 11032acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner 1104c532b502858032f377056dc8cba2fe43cba8702bRafael Espindola // Recover by adding 'static'. 1105c532b502858032f377056dc8cba2fe43cba8702bRafael Espindola DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 11063c827a79cb7d04c255db8080e682ee2c6912373dDaniel Dunbar } 1107f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall // C++ [class.union]p3: 110899b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner // A storage class is not allowed in a declaration of an 11096a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola // anonymous union in a class scope. 11106a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 11117270ee4cd4794281c09dfb6931a98bbb2581ef02Anders Carlsson isa<RecordDecl>(Owner)) { 11126a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola Diag(DS.getStorageClassSpecLoc(), 11136a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola diag::err_anonymous_union_with_storage_spec); 11146a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola Invalid = true; 11156a836706c40a31c716952b74785102c90fd6afa7Rafael Espindola 1116c532b502858032f377056dc8cba2fe43cba8702bRafael Espindola // Recover by removing the storage specifier. 1117c532b502858032f377056dc8cba2fe43cba8702bRafael Espindola DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1118c532b502858032f377056dc8cba2fe43cba8702bRafael Espindola PrevSpec); 111974391b48b4791cded373683a3baf67314f358d50Chris Lattner } 1120570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner 11211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // C++ [class.union]p2: 112299b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner // The member-specification of an anonymous union shall only 11233c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson // define non-static data members. [Note: nested types and 112499b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner // functions cannot be declared within an anonymous union. ] 11251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (DeclContext::decl_iterator Mem = Record->decls_begin(Context), 112667b00520c8f5b48fad722b790d87fea6be764efeChris Lattner MemEnd = Record->decls_end(Context); 112767b00520c8f5b48fad722b790d87fea6be764efeChris Lattner Mem != MemEnd; ++Mem) { 112867b00520c8f5b48fad722b790d87fea6be764efeChris Lattner if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1129f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall // C++ [class.union]p3: 113067b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // An anonymous union shall not have private or protected 113167b00520c8f5b48fad722b790d87fea6be764efeChris Lattner // members (clause 11). 113267b00520c8f5b48fad722b790d87fea6be764efeChris Lattner if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 113367b00520c8f5b48fad722b790d87fea6be764efeChris Lattner Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 113467b00520c8f5b48fad722b790d87fea6be764efeChris Lattner << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 113567b00520c8f5b48fad722b790d87fea6be764efeChris Lattner Invalid = true; 11361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 11371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else if ((*Mem)->isImplicit()) { 11381eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Any implicit members are fine. 113999b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1140f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall // This is a type that showed up in an 114156ebe5082da7411fb37479e230b52735f77cff35Eli Friedman // elaborated-type-specifier inside the anonymous struct or 114249988884c1da4b2200bfe2298a1e41b3f044e8d4Daniel Dunbar // union, but which actually declares a type outside of the 114399b53613ebe2c59d41030e987962c1ed101b2efeChris Lattner // anonymous struct or union. It's okay. 114474391b48b4791cded373683a3baf67314f358d50Chris Lattner } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1145f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump if (!MemRecord->isAnonymousStructOrUnion() && 1146f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump MemRecord->getDeclName()) { 1147da55074866ca2fe7f718c5d3334648d6e340fb15Douglas Gregor // This is a nested type declaration. 114849988884c1da4b2200bfe2298a1e41b3f044e8d4Daniel Dunbar Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1149110e8e56af30363072c140285961592b0107f789John McCall << (int)Record->isUnion(); 1150af14603ca61757cf4361b583b45639a04c57e651John McCall Invalid = true; 1151af14603ca61757cf4361b583b45639a04c57e651John McCall } 115215e310a3b970b64a84cb30f0005bc396b4d978cbJohn McCall } else { 1153110e8e56af30363072c140285961592b0107f789John McCall // We have something that isn't a non-static data 1154110e8e56af30363072c140285961592b0107f789John McCall // member. Complain about it. 1155110e8e56af30363072c140285961592b0107f789John McCall unsigned DK = diag::err_anonymous_record_bad_member; 11560a0d2b179085a52c10402feebeb6db8b4d96a140Douglas Gregor if (isa<TypeDecl>(*Mem)) 1157110e8e56af30363072c140285961592b0107f789John McCall DK = diag::err_anonymous_record_with_type; 1158110e8e56af30363072c140285961592b0107f789John McCall else if (isa<FunctionDecl>(*Mem)) 1159af14603ca61757cf4361b583b45639a04c57e651John McCall DK = diag::err_anonymous_record_with_function; 1160af14603ca61757cf4361b583b45639a04c57e651John McCall else if (isa<VarDecl>(*Mem)) 1161af14603ca61757cf4361b583b45639a04c57e651John McCall DK = diag::err_anonymous_record_with_static; 1162110e8e56af30363072c140285961592b0107f789John McCall Diag((*Mem)->getLocation(), DK) 116356ebe5082da7411fb37479e230b52735f77cff35Eli Friedman << (int)Record->isUnion(); 116456ebe5082da7411fb37479e230b52735f77cff35Eli Friedman Invalid = true; 116574391b48b4791cded373683a3baf67314f358d50Chris Lattner } 11661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 1167f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall } 116874391b48b4791cded373683a3baf67314f358d50Chris Lattner 1169eda9a5ec380f172f4e0063744eb796144a125480Daniel Dunbar if (!Record->isUnion() && !Owner->isRecord()) { 1170eda9a5ec380f172f4e0063744eb796144a125480Daniel Dunbar Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 11713bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson << (int)getLangOptions().CPlusPlus; 11725f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner Invalid = true; 11732acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner } 11743bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson 11753bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson // Create a declaration for this anonymous struct/union. 11763bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson NamedDecl *Anon = 0; 11773bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 11783bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 11793bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson /*IdentifierInfo=*/0, 11803bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson Context.getTypeDeclType(Record), 11813bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson /*BitWidth=*/0, /*Mutable=*/false); 11823bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson Anon->setAccess(AS_public); 11833bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson if (getLangOptions().CPlusPlus) 11843bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson FieldCollector->Add(cast<FieldDecl>(Anon)); 11853bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson } else { 118696eaf2992b5955d1470fc9cce7a96e7e1e3b4ea7Anders Carlsson VarDecl::StorageClass SC; 11873bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson switch (DS.getStorageClassSpec()) { 11883bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson default: assert(0 && "Unknown storage class!"); 11893bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 11903bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 11913bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson case DeclSpec::SCS_static: SC = VarDecl::Static; break; 11923bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 11933bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson case DeclSpec::SCS_register: SC = VarDecl::Register; break; 11943bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 11953bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson case DeclSpec::SCS_mutable: 11963bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson // mutable can only appear on non-static class members, so it's always 11973bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson // an error here 11983bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson Diag(Record->getLocation(), diag::err_mutable_nonmember); 11993bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson Invalid = true; 12003bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson SC = VarDecl::None; 12013bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson break; 12023bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson } 12033bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson 12043bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 12053bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson /*IdentifierInfo=*/0, 12063bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson Context.getTypeDeclType(Record), 12073bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson SC, DS.getSourceRange().getBegin()); 12083bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson } 12093bd6202ea2d5b5f7c8229cd280a846ae3dcf2355Anders Carlsson Anon->setImplicit(); 121074391b48b4791cded373683a3baf67314f358d50Chris Lattner 121174391b48b4791cded373683a3baf67314f358d50Chris Lattner // Add the anonymous struct/union object to the current 121274391b48b4791cded373683a3baf67314f358d50Chris Lattner // context. We'll be referencing this object when we refer to one of 121374391b48b4791cded373683a3baf67314f358d50Chris Lattner // its members. 121474391b48b4791cded373683a3baf67314f358d50Chris Lattner Owner->addDecl(Context, Anon); 12152acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner 121674391b48b4791cded373683a3baf67314f358d50Chris Lattner // Inject the members of the anonymous struct/union into the owning 121774391b48b4791cded373683a3baf67314f358d50Chris Lattner // context and into the identifier resolver chain for name lookup 121874391b48b4791cded373683a3baf67314f358d50Chris Lattner // purposes. 121974391b48b4791cded373683a3baf67314f358d50Chris Lattner if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 12201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Invalid = true; 12212acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner 1222207f4d8543529221932af82836016a2ef066c917Peter Collingbourne // Mark this as an anonymous struct/union type. Note that we do not 1223f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall // do this until after we have already checked and injected the 12245f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner // members of this anonymous struct/union type, because otherwise 1225f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall // the members could be injected twice: once by DeclContext when it 122674391b48b4791cded373683a3baf67314f358d50Chris Lattner // builds its lookup table, and once by 12273f75c43bd77e063342bc888ac276daf64ba0ce07Daniel Dunbar // InjectAnonymousStructOrUnionMembers. 122874391b48b4791cded373683a3baf67314f358d50Chris Lattner Record->setAnonymousStructOrUnion(true); 122974391b48b4791cded373683a3baf67314f358d50Chris Lattner 123074391b48b4791cded373683a3baf67314f358d50Chris Lattner if (Invalid) 12312acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner Anon->setInvalidDecl(); 12325f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner 12331de4d4e8cb2e9c88809fea8092bc6e835a5473d2John McCall return DeclPtrTy::make(Anon); 1234c532b502858032f377056dc8cba2fe43cba8702bRafael Espindola} 1235bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar 1236bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar 123703f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar/// GetNameForDeclarator - Determine the full declaration name for the 123803f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar/// given Declarator. 123903f5ad9a7707e098f601921fcec17ed65eb355a7Daniel DunbarDeclarationName Sema::GetNameForDeclarator(Declarator &D) { 12407520bd1de12af10ea08c662440565adbdf589317Douglas Gregor switch (D.getKind()) { 12417520bd1de12af10ea08c662440565adbdf589317Douglas Gregor case Declarator::DK_Abstract: 12427520bd1de12af10ea08c662440565adbdf589317Douglas Gregor assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 12437520bd1de12af10ea08c662440565adbdf589317Douglas Gregor return DeclarationName(); 12445f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner 1245f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall case Declarator::DK_Normal: 1246555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 124703f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar return DeclarationName(D.getIdentifier()); 12487520bd1de12af10ea08c662440565adbdf589317Douglas Gregor 12497520bd1de12af10ea08c662440565adbdf589317Douglas Gregor case Declarator::DK_Constructor: { 12507520bd1de12af10ea08c662440565adbdf589317Douglas Gregor QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 12517520bd1de12af10ea08c662440565adbdf589317Douglas Gregor Ty = Context.getCanonicalType(Ty); 125203f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar return Context.DeclarationNames.getCXXConstructorName(Ty); 125303f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar } 125403f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar 12556fb745bdf1ff1e32caf07e42093a7920726892c1Douglas Gregor case Declarator::DK_Destructor: { 12566fb745bdf1ff1e32caf07e42093a7920726892c1Douglas Gregor QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 12576fb745bdf1ff1e32caf07e42093a7920726892c1Douglas Gregor Ty = Context.getCanonicalType(Ty); 12586fb745bdf1ff1e32caf07e42093a7920726892c1Douglas Gregor return Context.DeclarationNames.getCXXDestructorName(Ty); 12596fb745bdf1ff1e32caf07e42093a7920726892c1Douglas Gregor } 12604b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor 1261046c294a43024874ff35656c6e785b64e72f1f36Anders Carlsson case Declarator::DK_Conversion: { 1262cb5d2d0647fdab2e36c85b417e03bf18916ce10cEli Friedman // FIXME: We'd like to keep the non-canonical type for diagnostics! 1263dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1264dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor Ty = Context.getCanonicalType(Ty); 1265dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1266dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor } 1267dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor 1268dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor case Declarator::DK_Operator: 12694b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor assert(D.getIdentifier() == 0 && "operator names have no identifier"); 127006a54a38be5054c910ffc92db60edab23f9ea105Argyrios Kyrtzidis return Context.DeclarationNames.getCXXOperatorName( 12714b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor D.getOverloadedOperator()); 1272dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor } 12734b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor 12744b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor assert(false && "Unknown name kind"); 12754b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor return DeclarationName(); 12766d7f8473cd6e967b3676948894ce72472102f9cbAnders Carlsson} 12776d7f8473cd6e967b3676948894ce72472102f9cbAnders Carlsson 12786d7f8473cd6e967b3676948894ce72472102f9cbAnders Carlsson/// isNearlyMatchingFunction - Determine whether the C++ functions 12796d7f8473cd6e967b3676948894ce72472102f9cbAnders Carlsson/// Declaration and Definition are "nearly" matching. This heuristic 12806d7f8473cd6e967b3676948894ce72472102f9cbAnders Carlsson/// is used to improve diagnostics in the case where an out-of-line 12816d7f8473cd6e967b3676948894ce72472102f9cbAnders Carlsson/// function definition doesn't match any declaration within 12824b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor/// the class or namespace. 1283142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanianstatic bool isNearlyMatchingFunction(ASTContext &Context, 1284142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian FunctionDecl *Declaration, 1285142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian FunctionDecl *Definition) { 12864b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor if (Declaration->param_size() != Definition->param_size()) 12874b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor return false; 12884b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 12894b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1290142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1291142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian 1292142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1293f502d93b0ea970bfbd897e657f8d940a20984de2Anders Carlsson DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 12944b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1295142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian return false; 1296142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian } 1297142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian 1298f502d93b0ea970bfbd897e657f8d940a20984de2Anders Carlsson return true; 12994b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor} 13004b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor 13014b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas GregorSema::DeclPtrTy 13024b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas GregorSema::ActOnDeclarator(Scope *S, Declarator &D, bool IsFunctionDefinition) { 1303142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian DeclarationName Name = GetNameForDeclarator(D); 1304142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian 1305142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian // All of these full declarators require an identifier. If it doesn't have 13064b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor // one, the ParsedFreeStandingDeclSpec action should be used. 1307dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor if (!Name) { 1308dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor if (!D.getInvalidType()) // Reject this if we think it is valid. 130953bad4e98ed5e765df4231099bf1c737582908bfFariborz Jahanian Diag(D.getDeclSpec().getSourceRange().getBegin(), 131053bad4e98ed5e765df4231099bf1c737582908bfFariborz Jahanian diag::err_declarator_need_ident) 131153bad4e98ed5e765df4231099bf1c737582908bfFariborz Jahanian << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1312dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor return DeclPtrTy(); 1313dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor } 1314dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor 1315dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor // The scope passed in may not be a decl scope. Zip up the scope tree until 1316dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor // we find one that is. 1317dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor while ((S->getFlags() & Scope::DeclScope) == 0 || 1318dffb8010a130733f1b55acf0af01deb0a2e083d3Douglas Gregor (S->getFlags() & Scope::TemplateParamScope) != 0) 1319142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian S = S->getParent(); 132053bad4e98ed5e765df4231099bf1c737582908bfFariborz Jahanian 1321142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian DeclContext *DC; 1322142f9e99018a85105cee570133c111a52f2053ecFariborz Jahanian NamedDecl *PrevDecl; 132353bad4e98ed5e765df4231099bf1c737582908bfFariborz Jahanian NamedDecl *New; 13244b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor bool InvalidDecl = false; 13254b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor 13264b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor QualType R = GetTypeForDeclarator(D, S); 132753bad4e98ed5e765df4231099bf1c737582908bfFariborz Jahanian if (R.isNull()) { 13284b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor InvalidDecl = true; 13294b0f21c0f8bed0e2a7dc62d73be64e7e277d6c9aDouglas Gregor R = Context.IntTy; 13302acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner if (IsFunctionDefinition) // int(...) 133106f486ecd05bd6788da97c39164c1903a084c26dKen Dyck R = Context.getFunctionType(R, 0, 0, true, 0); 133206f486ecd05bd6788da97c39164c1903a084c26dKen Dyck 1333687cc4a850b59116efee061018f0d8df50728b82Ken Dyck } 1334687cc4a850b59116efee061018f0d8df50728b82Ken Dyck 1335bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar // See if this is a redefinition of a variable in the same scope. 13368f32f7189b12f67aa4a19bc7c3855b599980eca0Chris Lattner if (D.getCXXScopeSpec().isInvalid()) { 133777ba708819285931932ecd33691a672bb59d221aEli Friedman DC = CurContext; 13386c6bda3b0b1d8adaac2ba3f4da7056e9f1eef52eEli Friedman PrevDecl = 0; 13391eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump InvalidDecl = true; 134031310a21fb2a9f13950f864f681c86080b05d5b2Sebastian Redl } else if (!D.getCXXScopeSpec().isSet()) { 13413bb92693c3332c1e99870a4e45afff3892e1c6aeAnders Carlsson LookupNameKind NameKind = LookupOrdinaryName; 13423bb92693c3332c1e99870a4e45afff3892e1c6aeAnders Carlsson 1343cd5f4aaf0c219189878126d556f35e38fdb8afa1Eli Friedman // If the declaration we're planning to build will be a function 134403f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar // or object with linkage, then look for another declaration with 134503f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 134603f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 134703f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar /* Do nothing*/; 134803f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar else if (R->isFunctionType()) { 134903f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar if (CurContext->isFunctionOrMethod()) 135003f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar NameKind = LookupRedeclarationWithLinkage; 135103f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 135203f5ad9a7707e098f601921fcec17ed65eb355a7Daniel Dunbar NameKind = LookupRedeclarationWithLinkage; 1353b0d0ea042116c1f451d3db8ceff9f1dd92bc36d2Anders Carlsson 135477ba708819285931932ecd33691a672bb59d221aEli Friedman DC = CurContext; 1355c446d1816f46a4b6d2337102dfc001f55fc18211Douglas Gregor PrevDecl = LookupName(S, Name, NameKind, true, 13566e656f45ae04b415ba7a4c0c25e55633e2d0ecd0Eli Friedman D.getDeclSpec().getStorageClassSpec() != 13573bb92693c3332c1e99870a4e45afff3892e1c6aeAnders Carlsson DeclSpec::SCS_static, 1358c446d1816f46a4b6d2337102dfc001f55fc18211Douglas Gregor D.getIdentifierLoc()); 1359c446d1816f46a4b6d2337102dfc001f55fc18211Douglas Gregor } else { // Something like "int foo::x;" 1360c446d1816f46a4b6d2337102dfc001f55fc18211Douglas Gregor DC = computeDeclContext(D.getCXXScopeSpec()); 136189ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 136289ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 13636c6bda3b0b1d8adaac2ba3f4da7056e9f1eef52eEli Friedman 136489ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson // C++ 7.3.1.2p2: 136589ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson // Members (including explicit specializations of templates) of a named 136689ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson // namespace can also be defined outside that namespace by explicit 136789ed31d3f9eeb8ec77c284a5cf404a74bf5e7acfAnders Carlsson // qualification of the name being defined, provided that the entity being 1368bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall // defined was already declared in the namespace and the definition appears 1369bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall // after the point of declaration in a namespace that encloses the 1370bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall // declarations namespace. 1371bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall // 1372bf40cb518312dde1c07e44fcae59bc4eec65589cJohn McCall // Note that we only check the context at this point. We don't yet 13736e656f45ae04b415ba7a4c0c25e55633e2d0ecd0Eli Friedman // have enough information to make sure that PrevDecl is actually 13748f32f7189b12f67aa4a19bc7c3855b599980eca0Chris Lattner // the declaration we want to match. For example, given: 13758e53e720b3d7c962e91138a130dbd5d6c2def0e5Devang Patel // 13762acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner // class X { 1377570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // void f(); 13781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // void f(float); 1379570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // }; 1380570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // 13819d4a15fd3b85434c43ea27562793de63a793321aChris Lattner // void X::f(int) { } // ill-formed 13829d4a15fd3b85434c43ea27562793de63a793321aChris Lattner // 13839d4a15fd3b85434c43ea27562793de63a793321aChris Lattner // In this case, PrevDecl will point to the overload set 1384570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // containing the two f's declared in X, but neither of them 1385570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // matches. 13861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1387570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // First check whether we named the global scope. 1388570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner if (isa<TranslationUnitDecl>(DC)) { 13891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1390570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner << Name << D.getCXXScopeSpec().getRange(); 1391570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner } else if (!CurContext->Encloses(DC)) { 1392570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // The qualifying scope doesn't enclose the original declaration. 1393570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // Emit diagnostic based on current scope. 1394570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner SourceLocation L = D.getIdentifierLoc(); 1395570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner SourceRange R = D.getCXXScopeSpec().getRange(); 1396570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner if (isa<FunctionDecl>(CurContext)) 1397570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1398570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner else 1399570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner Diag(L, diag::err_invalid_declarator_scope) 1400570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner << Name << cast<NamedDecl>(DC) << R; 1401207f4d8543529221932af82836016a2ef066c917Peter Collingbourne InvalidDecl = true; 1402207f4d8543529221932af82836016a2ef066c917Peter Collingbourne } 14031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 1404f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall 14055f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (PrevDecl && PrevDecl->isTemplateParameter()) { 1406232350d4faf46ec38d5ff60e11505f9c4fa9535bDaniel Dunbar // Maybe we will complain about the shadowed template parameter. 1407570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner InvalidDecl = InvalidDecl 1408570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 14090558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner // Just pretend that we didn't see the previous declaration. 141077ba708819285931932ecd33691a672bb59d221aEli Friedman PrevDecl = 0; 14111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 14123c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson 1413570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // In C++, the previous declaration we find might be a tag type 141477ba708819285931932ecd33691a672bb59d221aEli Friedman // (class or enum). In this case, the new declaration will hide the 141577ba708819285931932ecd33691a672bb59d221aEli Friedman // tag type. Note that this does does not apply if we're declaring a 1416570585c91dee98d7ba8ccf1198c03208ba17966bChris Lattner // typedef (C++ [dcl.typedef]p4). 141777ba708819285931932ecd33691a672bb59d221aEli Friedman if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 141877ba708819285931932ecd33691a672bb59d221aEli Friedman D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 141977f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge PrevDecl = 0; 142077f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 14218bd4afeb876fd0015bb808eb2f3de1fe709658a7Nate Begeman bool Redeclaration = false; 142288a69ad80e1550e9932666e6efa050a5b1223889Chris Lattner if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1423e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, 1424e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner InvalidDecl, Redeclaration); 1425e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner } else if (R->isFunctionType()) { 1426da55074866ca2fe7f718c5d3334648d6e340fb15Douglas Gregor New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, 1427e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner IsFunctionDefinition, InvalidDecl, 14281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Redeclaration); 14298b752f10c394b140f9ef89e049cbad1a7676fc25Ken Dyck } else { 1430354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, 143188a69ad80e1550e9932666e6efa050a5b1223889Chris Lattner InvalidDecl, Redeclaration); 1432354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian } 1433354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian 1434354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian if (New == 0) 1435354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian return DeclPtrTy(); 1436354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian 1437354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian // If this has an identifier and is not an invalid redeclaration, 1438354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian // add it to the scope stack. 1439354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian if (Name && !(Redeclaration && InvalidDecl)) 1440354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian PushOnScopeChains(New, S); 14413030eb82593097502469a8b3fc26112c79c75605John McCall // If any semantic error occurred, mark the decl as invalid. 14423030eb82593097502469a8b3fc26112c79c75605John McCall if (D.getInvalidType() || InvalidDecl) 14433030eb82593097502469a8b3fc26112c79c75605John McCall New->setInvalidDecl(); 14443030eb82593097502469a8b3fc26112c79c75605John McCall 1445354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian return DeclPtrTy::make(New); 144673fb35003aad027492e661a3749e921b5d1ecaf9Eric Christopher} 1447354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian 1448354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1449354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian/// types into constant array types in certain situations which would otherwise 1450354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian/// be errors (for GCC compatibility). 1451354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanianstatic QualType TryToFixInvalidVariablyModifiedType(QualType T, 1452354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian ASTContext &Context, 145390e99a84ddd020e8fda79643748243725a2ed071Argyrios Kyrtzidis bool &SizeIsNegative) { 1454a0f00a71fcb0f98298709d5e5318339acf7958acDouglas Gregor // This method tries to turn a variable array into a constant 1455354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian // array even when the size isn't an ICE. This is necessary 145640b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis // for compatibility with code that depends on gcc's buggy 1457354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian // constant expression folding, like struct {char x[(int)(char*)2];} 145840b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis SizeIsNegative = false; 1459354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian 1460e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1461e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner QualType Pointee = PTy->getPointeeType(); 1462354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian QualType FixedType = 1463e78b86f3201ae5f09e2cf85bd6558f1d9b34de26Chris Lattner TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1464354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian if (FixedType.isNull()) return FixedType; 14658f51a4f2d00b0abda3cde7f3828fb2e2b9beafb5Douglas Gregor FixedType = Context.getPointerType(FixedType); 14668f51a4f2d00b0abda3cde7f3828fb2e2b9beafb5Douglas Gregor FixedType.setCVRQualifiers(T.getCVRQualifiers()); 146799ace16bc6962f1fc3dc45bbbdf2eb74e555a8adJohn McCall return FixedType; 1468a6cf1e709b96865210b81bd611d41e9a2d41500aEric Christopher } 1469a6cf1e709b96865210b81bd611d41e9a2d41500aEric Christopher 1470a6cf1e709b96865210b81bd611d41e9a2d41500aEric Christopher const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1471309457d0f1b416c1b379c9f3e172848adffedb23Chris Lattner if (!VLATy) 1472ab27d6ea7b4ce2762a16905281de796db32bb6f2Fariborz Jahanian return QualType(); 1473ab27d6ea7b4ce2762a16905281de796db32bb6f2Fariborz Jahanian // FIXME: We should probably handle this case 147491f31dc234bbc98f3dd20e6741a7b0b98c7916bfEric Christopher if (VLATy->getElementType()->isVariablyModifiedType()) 1475354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian return QualType(); 1476686226b538e72c5059ab7c9a8f87eb883193b645Sanjiv Gupta 1477354e712c81fbb07c0ce5f06180788b25fffa1b56Fariborz Jahanian Expr::EvalResult EvalResult; 147888a69ad80e1550e9932666e6efa050a5b1223889Chris Lattner if (!VLATy->getSizeExpr() || 14795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1480bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner !EvalResult.Val.isInt()) 1481bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return QualType(); 1482bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1483bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner llvm::APSInt &Res = EvalResult.Val.getInt(); 1484bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1485bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return Context.getConstantArrayType(VLATy->getElementType(), 1486bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner Res, ArrayType::Normal, 0); 1487bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1488bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner SizeIsNegative = true; 1489bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner return QualType(); 1490bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner} 1491bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1492bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner/// \brief Register the given locally-scoped external C declaration so 1493bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner/// that it can be found later for redeclarations 14941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpvoid 14952acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris LattnerSema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 14965f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner Scope *S) { 1497bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1498bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner "Decl is not a locally-scoped decl!"); 1499dbf02bccc9fc1115cb7dd45c84df77252d68f220Benjamin Kramer // Note that we have a locally-scoped external with this name. 1500bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1501dbf02bccc9fc1115cb7dd45c84df77252d68f220Benjamin Kramer 1502dbf02bccc9fc1115cb7dd45c84df77252d68f220Benjamin Kramer if (!PrevDecl) 15038670cd3ea4dfbf86caacd270ec2441e9949bbb6aGabor Greif return; 150435db3b9aad1829a1279b9e213ddee36395314a0bGabor Greif 1505dbf02bccc9fc1115cb7dd45c84df77252d68f220Benjamin Kramer // If there was a previous declaration of this variable, it may be 15061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // in our identifier chain. Update the identifier chain with the new 1507bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // declaration. 1508bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1509bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // The previous declaration was found on the identifer resolver 1510bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // chain, so remove it from its scope. 1511bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 151240f9c302f23a35611cd354f40b22b37f2c554a40John McCall S = S->getParent(); 151340f9c302f23a35611cd354f40b22b37f2c554a40John McCall 151440f9c302f23a35611cd354f40b22b37f2c554a40John McCall if (S) 151540f9c302f23a35611cd354f40b22b37f2c554a40John McCall S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 151640f9c302f23a35611cd354f40b22b37f2c554a40John McCall } 151740f9c302f23a35611cd354f40b22b37f2c554a40John McCall} 151840f9c302f23a35611cd354f40b22b37f2c554a40John McCall 151940f9c302f23a35611cd354f40b22b37f2c554a40John McCall/// \brief Diagnose function specifiers on a declaration of an identifier that 152040f9c302f23a35611cd354f40b22b37f2c554a40John McCall/// does not identify a function. 152140f9c302f23a35611cd354f40b22b37f2c554a40John McCallvoid Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 152240f9c302f23a35611cd354f40b22b37f2c554a40John McCall // FIXME: We should probably indicate the identifier in question to avoid 1523bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // confusion for constructs like "inline int a(), b;" 1524bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (D.getDeclSpec().isInlineSpecified()) 1525bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner Diag(D.getDeclSpec().getInlineSpecLoc(), 1526bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner diag::err_inline_non_function); 1527bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1528bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (D.getDeclSpec().isVirtualSpecified()) 1529bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner Diag(D.getDeclSpec().getVirtualSpecLoc(), 153035db3b9aad1829a1279b9e213ddee36395314a0bGabor Greif diag::err_virtual_non_function); 153135db3b9aad1829a1279b9e213ddee36395314a0bGabor Greif 1532bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (D.getDeclSpec().isExplicitSpecified()) 1533bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner Diag(D.getDeclSpec().getExplicitSpecLoc(), 1534bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner diag::err_explicit_non_function); 153540f9c302f23a35611cd354f40b22b37f2c554a40John McCall} 153640f9c302f23a35611cd354f40b22b37f2c554a40John McCall 153740f9c302f23a35611cd354f40b22b37f2c554a40John McCallNamedDecl* 153840f9c302f23a35611cd354f40b22b37f2c554a40John McCallSema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1539bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner QualType R, Decl* PrevDecl, bool& InvalidDecl, 1540bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner bool &Redeclaration) { 1541bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 15421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (D.getCXXScopeSpec().isSet()) { 154340f9c302f23a35611cd354f40b22b37f2c554a40John McCall Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 154440f9c302f23a35611cd354f40b22b37f2c554a40John McCall << D.getCXXScopeSpec().getRange(); 154540f9c302f23a35611cd354f40b22b37f2c554a40John McCall InvalidDecl = true; 1546bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // Pretend we didn't see the scope specifier. 1547bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner DC = 0; 15486ba728d9687b2617793f5afd410650a8d6c71080Gabor Greif } 15494c7d9f1507d0f102bd4133bba63348636facd469Jay Foad 1550bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (getLangOptions().CPlusPlus) { 1551ffbb15e54a6dc120087003d1e42448b8705bd58aBenjamin Kramer // Check that there are no default arguments (C++ only). 1552bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner CheckExtraCXXDefaultArguments(D); 155340f9c302f23a35611cd354f40b22b37f2c554a40John McCall } 155440f9c302f23a35611cd354f40b22b37f2c554a40John McCall 1555ca6408c3176783f0b29da4679a08512aa05f0c73Daniel Dunbar DiagnoseFunctionSpecifiers(D); 1556bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 1557bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 155800549fcec0490b2daf27543e532f94adbb186063Chris Lattner if (!NewTD) return 0; 155900549fcec0490b2daf27543e532f94adbb186063Chris Lattner 15603b122bc5f1203615e2128e0c1a63da438865b1ccDevang Patel // Handle attributes prior to checking for duplicates in MergeVarDecl 1561c60346388d60b1756f3675dabb60dc58da0728ecChris Lattner ProcessDeclAttributes(NewTD, D); 1562c60346388d60b1756f3675dabb60dc58da0728ecChris Lattner // Merge the decl with the existing one if appropriate. If the decl is 1563c60346388d60b1756f3675dabb60dc58da0728ecChris Lattner // in an outer scope, it isn't the same thing. 1564bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1565bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner Redeclaration = true; 1566bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (MergeTypeDefDecl(NewTD, PrevDecl)) 1567bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner InvalidDecl = true; 1568bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar } 1569b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner 1570b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner if (S->getFnParent() == 0) { 1571d26bc76c98006609002d9930f8840490e88ac5b5John McCall QualType T = NewTD->getUnderlyingType(); 15721f6f961293da9c2b1c23da2411c1b439a9502ed0John McCall // C99 6.7.7p2: If a typedef name specifies a variably modified type 1573d26bc76c98006609002d9930f8840490e88ac5b5John McCall // then it shall have block scope. 15741f6f961293da9c2b1c23da2411c1b439a9502ed0John McCall if (T->isVariablyModifiedType()) { 15751f6f961293da9c2b1c23da2411c1b439a9502ed0John McCall bool SizeIsNegative; 15761f6f961293da9c2b1c23da2411c1b439a9502ed0John McCall QualType FixedTy = 15772acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1578d26bc76c98006609002d9930f8840490e88ac5b5John McCall if (!FixedTy.isNull()) { 15799fa959d5bfbbb17d7c6ba71252219201fc8dc971Chris Lattner Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1580b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner NewTD->setUnderlyingType(FixedTy); 15811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } else { 15820558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner if (SizeIsNegative) 15830558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 15840558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner else if (T->isVariableArrayType()) 15850558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 15860558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner else 15871eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 15881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump InvalidDecl = true; 15890558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner } 1590bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner } 15911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 159242745815fa4e90bfb07e581d2e5152b2c2db08ffDaniel Dunbar return NewTD; 1593bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner} 15940558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner 159534809507232bc4c3c4840c7d092c7440219fddafChris Lattner/// \brief Determines whether the given declaration is an out-of-scope 159662b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner/// previous declaration. 159762b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner/// 159862b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner/// This routine should be invoked when name lookup has found a 159962b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner/// previous declaration (PrevDecl) that is not in the scope where a 160062b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner/// new declaration by the same name is being introduced. If the new 160162b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner/// declaration occurs in a local scope, previous declarations with 1602f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall/// linkage may still be considered previous declarations (C99 1603f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall/// 6.2.2p4-5, C++ [basic.link]p6). 16045f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner/// 1605b4880bab7fc1b61267cfd9a0ad52188e7a828cb3Chris Lattner/// \param PrevDecl the previous declaration found by name 16061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// lookup 1607bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner/// 1608bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner/// \param DC the context in which the new declaration is being 1609bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner/// declared. 16109fa959d5bfbbb17d7c6ba71252219201fc8dc971Chris Lattner/// 1611bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner/// \returns true if PrevDecl is an out-of-scope previous declaration 16129fa959d5bfbbb17d7c6ba71252219201fc8dc971Chris Lattner/// for a new delcaration with the same name. 16139fa959d5bfbbb17d7c6ba71252219201fc8dc971Chris Lattnerstatic bool 16141eb4433ac451dc16f4133a88af2d002ac26c58efMike StumpisOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 161562b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner ASTContext &Context) { 1616bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner if (!PrevDecl) 16171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return 0; 16183c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson 1619bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1620bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner // case we need to check each of the overloaded functions. 16211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!PrevDecl->hasLinkage()) 162262b33ea51adbd0e7f2f05983e9e4a3a2b2ed26deChris Lattner return false; 1623bdb0132722082886558f31eccdba06ae1852c0eeChris Lattner 16241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (Context.getLangOptions().CPlusPlus) { 16250558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner // C++ [basic.link]p6: 1626bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar // If there is a visible declaration of an entity with linkage 16271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // having the same name and type, ignoring entities declared 1628112c967bd5c862a0f5d7913aa06700c048807db8John McCall // outside the innermost enclosing namespace scope, the block 1629112c967bd5c862a0f5d7913aa06700c048807db8John McCall // scope declaration declares that same entity and receives the 1630112c967bd5c862a0f5d7913aa06700c048807db8John McCall // linkage of the previous declaration. 1631112c967bd5c862a0f5d7913aa06700c048807db8John McCall DeclContext *OuterContext = DC->getLookupContext(); 16320558e79840bfdbbd38c6e2b4f6765bf0158e85f4Chris Lattner if (!OuterContext->isFunctionOrMethod()) 16338b2423361648c39a7d8a3c5e8129e12006deac32John McCall // This rule only applies to block-scope declarations. 1634bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar return false; 1635112c967bd5c862a0f5d7913aa06700c048807db8John McCall else { 16360ffeaad72cb335b926b064379be4c9886bbff004Anders Carlsson DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1637112c967bd5c862a0f5d7913aa06700c048807db8John McCall if (PrevOuterContext->isRecord()) 1638d26bc76c98006609002d9930f8840490e88ac5b5John McCall // We found a member function: ignore it. 16396379a7a15335e0af543a942efe9cfd514a83dab8Daniel Dunbar return false; 16407c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar else { 16417c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // Find the innermost enclosing namespace for the new and 16421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // previous declarations. 164340b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis while (!OuterContext->isFileContext()) 1644219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar OuterContext = OuterContext->getParent(); 164540b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis while (!PrevOuterContext->isFileContext()) 1646219df6644e2338ff067471ab0d85f27b88544ac2Daniel Dunbar PrevOuterContext = PrevOuterContext->getParent(); 164777f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge 164877f68bb90af93b95045fb994e7cd68137adcc132Julien Lerouge // The previous declaration is in a different namespace, so it 1649bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar // isn't the same function. 1650bd012ff1fa088181646a784f385b28867372d434Daniel Dunbar if (OuterContext->getPrimaryContext() != 1651f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall PrevOuterContext->getPrimaryContext()) 1652f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall return false; 165340b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis } 1654bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner } 1655bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner } 16565f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner 1657f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall return true; 1658f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall} 1659f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall 1660f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCallNamedDecl* 1661f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCallSema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1662f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall QualType R,NamedDecl* PrevDecl, bool& InvalidDecl, 16631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump bool &Redeclaration) { 16642acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner DeclarationName Name = GetNameForDeclarator(D); 1665bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner 1666bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner // Check that there are no default arguments (C++ only). 1667bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner if (getLangOptions().CPlusPlus) 1668bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner CheckExtraCXXDefaultArguments(D); 1669bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner 16701faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson VarDecl *NewVD; 16711faa89f9c619e4b2411fab4af7e22ee7a2bd9009Anders Carlsson VarDecl::StorageClass SC; 1672bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner switch (D.getDeclSpec().getStorageClassSpec()) { 1673f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall default: assert(0 && "Unknown storage class!"); 167496e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1675bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1676bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner case DeclSpec::SCS_static: SC = VarDecl::Static; break; 16771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1678bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1679bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1680bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner case DeclSpec::SCS_mutable: 16811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // mutable can only appear on non-static class members, so it's always 1682bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner // an error here 1683f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1684f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall InvalidDecl = true; 1685bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner SC = VarDecl::None; 1686bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner break; 1687bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner } 1688bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner 1689bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner IdentifierInfo *II = Name.getAsIdentifierInfo(); 1690bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner if (!II) { 1691bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1692f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall << Name.getAsString(); 16931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return 0; 16943c4972def972f8ca44dcd0561779a12aaa6fec97Owen Anderson } 1695bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner 1696bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner DiagnoseFunctionSpecifiers(D); 1697f746aa6a8f538be914173a4aef2d9a2fd9f99d17John McCall 16989a20d55807cc2f6534a9c51a46cc8143ed16786dAnders Carlsson bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1699bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner if (!DC->isRecord() && S->getFnParent() == 0) { 17001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // C99 6.9p2: The storage-class specifiers auto and register shall not 17017c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // appear in the declaration specifiers in an external declaration. 17027c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (SC == VarDecl::Auto || SC == VarDecl::Register) { 17037c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 170440b598eea1310ec9ed554d56ce3e25b34c585458Argyrios Kyrtzidis InvalidDecl = true; 17057c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar } 17067c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar } 170706a54a38be5054c910ffc92db60edab23f9ea105Argyrios Kyrtzidis if (DC->isRecord() && !CurContext->isRecord()) { 17087c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // This is an out-of-line definition of a static data member. 17097c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar if (SC == VarDecl::Static) { 17107c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar Diag(D.getDeclSpec().getStorageClassSpecLoc(), 17117c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar diag::err_static_out_of_line) 17121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << CodeModificationHint::CreateRemoval( 171311e8ce7380856abee188b237c2600272df2ed09dRafael Espindola SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 17140a0d2b179085a52c10402feebeb6db8b4d96a140Douglas Gregor } else if (SC == VarDecl::None) 17157c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar SC = VarDecl::Static; 17167c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar } 17177c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar 17187c65e990e9f0dafaf9adbc59b766dcc23eaee845Daniel Dunbar // The variable can not 1719bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1720bd53271dc7570b54f7b7cab7b09bcf04c6e927f6Chris Lattner II, R, SC, 17218dd55a3c3b28d195717c87bbc60e765951d408feBenjamin Kramer // FIXME: Move to DeclGroup... 17222d3ba4f5a923a90c3fc290ddfba5e36c2d0a9b46Chris Lattner D.getDeclSpec().getSourceRange().getBegin()); 1723df983a8bcbbcea911b8dce283f044787df119d50Jay Foad NewVD->setThreadSpecified(ThreadSpecified); 17248dd55a3c3b28d195717c87bbc60e765951d408feBenjamin Kramer 17257acda7c4a0e4aec6c003b3169ca45a5f3bc7e033Chris Lattner // Set the lexical context. If the declarator has a C++ scope specifier, the 1726bef20ac367a09555b30d6eb3847a81ec164caf88Chris Lattner // lexical context will be different from the semantic context. 17271d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar NewVD->setLexicalDeclContext(CurContext); 17281d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar 17291d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // Handle attributes prior to checking for duplicates in MergeVarDecl 173070ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar ProcessDeclAttributes(NewVD, D); 17311d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar 17321d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // Handle GNU asm-label extension (encoded as an attribute). 17335f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (Expr *E = (Expr*) D.getAsmLabel()) { 17342f4eaef37476ae6891ede8ba215d0f6fd093629bBenjamin Kramer // The parser guarantees this is a string. 17351d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar StringLiteral *SE = cast<StringLiteral>(E); 1736f015b034159d40e7033309e50036804eb1971787Daniel Dunbar NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1737f015b034159d40e7033309e50036804eb1971787Daniel Dunbar SE->getByteLength()))); 1738f015b034159d40e7033309e50036804eb1971787Daniel Dunbar } 17392f4eaef37476ae6891ede8ba215d0f6fd093629bBenjamin Kramer 1740f015b034159d40e7033309e50036804eb1971787Daniel Dunbar // If name lookup finds a previous declaration that is not in the 1741f015b034159d40e7033309e50036804eb1971787Daniel Dunbar // same scope as the new declaration, this may still be an 17421d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // acceptable redeclaration. 17435f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 17442f4eaef37476ae6891ede8ba215d0f6fd093629bBenjamin Kramer !(NewVD->hasLinkage() && 17451d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 17461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump PrevDecl = 0; 1747e7ddfb974884ec75ffd66953b79511ea457493baFariborz Jahanian 1748e7ddfb974884ec75ffd66953b79511ea457493baFariborz Jahanian // Merge the decl with the existing one if appropriate. 1749e7ddfb974884ec75ffd66953b79511ea457493baFariborz Jahanian if (PrevDecl) { 17501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 175170ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar // The user tried to define a non-static data member 17521d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // out-of-line (C++ [dcl.meaning]p1). 175370ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 175470ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar << D.getCXXScopeSpec().getRange(); 175570ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar PrevDecl = 0; 175670ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar InvalidDecl = true; 175770ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar } 175870ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar } else if (D.getCXXScopeSpec().isSet()) { 175970ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar // No previous declaration in the qualifying scope. 176070ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 176170ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar << Name << D.getCXXScopeSpec().getRange(); 176270ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar InvalidDecl = true; 176370ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar } 176470ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar 176570ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar if (CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration)) 176670ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar InvalidDecl = true; 176770ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar 176870ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar // If this is a locally-scoped extern C variable, update the map of 176970ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar // such variables. 1770434da48d0e35764f18b3fc96c75504746050b046Daniel Dunbar if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1771434da48d0e35764f18b3fc96c75504746050b046Daniel Dunbar !InvalidDecl) 1772434da48d0e35764f18b3fc96c75504746050b046Daniel Dunbar RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 177370ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar 17741d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar return NewVD; 17755f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner} 17761d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar 17771d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar/// \brief Perform semantic checking on a newly-created variable 1778cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian/// declaration. 1779cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian/// 1780cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian/// This routine performs all of the type-checking required for a 1781cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian/// variable declaration once it has been build. It is used both to 1782cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian/// check variables after they have been parsed and their declarators 17835f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner/// have been translated into a declaration, and to check 1784cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian/// 1785cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian/// \returns true if an error was encountered, false otherwise. 1786cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanianbool Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 1787cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian bool &Redeclaration) { 17881d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar bool Invalid = false; 17891d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar 17901d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar QualType T = NewVD->getType(); 17911d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar 17921d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar if (T->isObjCInterfaceType()) { 17931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 179470ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar Invalid = true; 179570ee975fad4653fa09f8e77f9a46a7b1f592ef59Daniel Dunbar } 17961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 17971d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar // The variable can not have an abstract class type. 17981d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar if (RequireNonAbstractType(NewVD->getLocation(), T, 17991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump diag::err_abstract_type_in_decl, 18000032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson AbstractVariableType)) 18010032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson Invalid = true; 18023e9df9920db8de8ec93a424b0c1784f9bff301eaDaniel Dunbar 18031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Emit an error if an address space was applied to decl with local storage. 18049d4a15fd3b85434c43ea27562793de63a793321aChris Lattner // This includes arrays of objects with address space qualifiers, but not 1805c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson // automatic variables that point to other address spaces. 18062acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner // ISO/IEC TR 18037 S5.1.2 180796e0fc726c6fe7538522c60743705d5e696b40afOwen Anderson if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 18081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 18099d4a15fd3b85434c43ea27562793de63a793321aChris Lattner Invalid = true; 18103e9df9920db8de8ec93a424b0c1784f9bff301eaDaniel Dunbar } 18113e9df9920db8de8ec93a424b0c1784f9bff301eaDaniel Dunbar 1812a5c04344fa70d6eec34344760c1fe511e16f2d76Jay Foad if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 1813c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson && !NewVD->hasAttr<BlocksAttr>()) 18141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 1815e3daa761061982f2267f7c8fb847ea02abad0aa9Anders Carlsson 18163e9df9920db8de8ec93a424b0c1784f9bff301eaDaniel Dunbar bool isIllegalVLA = T->isVariableArrayType() && NewVD->hasGlobalStorage(); 18172acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner bool isIllegalVM = T->isVariablyModifiedType() && NewVD->hasLinkage(); 1818e3daa761061982f2267f7c8fb847ea02abad0aa9Anders Carlsson if (isIllegalVLA || isIllegalVM) { 1819e3daa761061982f2267f7c8fb847ea02abad0aa9Anders Carlsson bool SizeIsNegative; 18201d236ab930816f5da27bade92904914c44b73b4cBenjamin Kramer QualType FixedTy = 182144b4321feab46299d3f5cfd404680884752a0fcfDouglas Gregor TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1822c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson if (!FixedTy.isNull()) { 18235add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 18241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump NewVD->setType(FixedTy); 1825c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson } else if (T->isVariableArrayType()) { 18262acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner Invalid = true; 18271eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 18285add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 18295add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson // FIXME: This won't give the correct result for 1830c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson // int a[10][n]; 18310032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1832a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar 183395b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner if (NewVD->isFileVarDecl()) 1834278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1835a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar << SizeRange; 1836278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner else if (NewVD->getStorageClass() == VarDecl::Static) 183795b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1838278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner << SizeRange; 1839278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner else 1840278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1841a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar << SizeRange; 1842584acf2ded2c18a18d6da0e1c01f5859a384d99fRafael Espindola } else { 1843584acf2ded2c18a18d6da0e1c01f5859a384d99fRafael Espindola Invalid = true; 1844584acf2ded2c18a18d6da0e1c01f5859a384d99fRafael Espindola 1845dc0f137295bc7ec5b231ff1842388f149f43c0c8Rafael Espindola if (NewVD->isFileVarDecl()) 1846278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1847a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar else 1848278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 18491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 1850278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner } 1851278b9f06933c385ffbccc15f8491787470cb4a1bChris Lattner 1852b266a1fce09ab4ee7033268199509aacfbef056aRafael Espindola if (!PrevDecl && NewVD->isExternC(Context)) { 1853a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar // Since we did not find anything by this name and we're declaring 18544da244c23d6093adbbbc41654aa5c5111b38f431Ken Dyck // an extern "C" variable, look for a non-visible extern "C" 18554da244c23d6093adbbbc41654aa5c5111b38f431Ken Dyck // declaration with the same name. 1856f7e903d7a30891083420c07ebeed281726a101d6Daniel Dunbar llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1857f7e903d7a30891083420c07ebeed281726a101d6Daniel Dunbar = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 1858f7e903d7a30891083420c07ebeed281726a101d6Daniel Dunbar if (Pos != LocallyScopedExternalDecls.end()) 1859a9668e0b4c451a1021fe650c451b54dc98c2d18dDaniel Dunbar PrevDecl = Pos->second; 1860a5c04344fa70d6eec34344760c1fe511e16f2d76Jay Foad } 18615add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson 1862c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson if (!Invalid && T->isVoidType() && !NewVD->hasExternalStorage()) { 1863c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 18645add6835b0c6b0f67e19fd5366825d3e41eb0dcfAnders Carlsson << T; 18651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Invalid = true; 1866c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson } 186708e252425ca2cbdc44ba65d9a657ed5398014e36Owen Anderson 18681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (PrevDecl) { 18691eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Redeclaration = true; 187095b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner if (MergeVarDecl(NewVD, PrevDecl)) 1871bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor Invalid = true; 18728e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar } 18731d5529132e4620562cab931c1f84c24e42f02741Daniel Dunbar 18741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump return NewVD->isInvalidDecl() || Invalid; 18750c67829763b98bc670062b553897a851fab17401Anders Carlsson} 1876c9e2091efcb535110474434dd12015afdc3b1637Anders Carlsson 187745e8cbdce25c2e16c7aac2036a591f6190097ae6Chris LattnerNamedDecl* 187845c4ea75b235de94f44bf96843624e6a559e4c00Douglas GregorSema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 187945c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor QualType R, NamedDecl* PrevDecl, 188045c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor bool IsFunctionDefinition, 188145c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor bool& InvalidDecl, bool &Redeclaration) { 188245c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor assert(R.getTypePtr()->isFunctionType()); 188345c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor 188445c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor DeclarationName Name = GetNameForDeclarator(D); 188545c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor FunctionDecl::StorageClass SC = FunctionDecl::None; 188645c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor switch (D.getDeclSpec().getStorageClassSpec()) { 188745c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor default: assert(0 && "Unknown storage class!"); 188833e982bf782d851bfe5767acb1336fcf3419ac6bFariborz Jahanian case DeclSpec::SCS_auto: 18894c73307c74764ba99e1379677fe92af72f676531Fariborz Jahanian case DeclSpec::SCS_register: 18902bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian case DeclSpec::SCS_mutable: 18912bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1892cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian diag::err_typecheck_sclass_func); 18932bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian InvalidDecl = true; 18942bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian break; 18952bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 18962bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 18972bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian case DeclSpec::SCS_static: { 18982bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian if (CurContext->getLookupContext()->isFunctionOrMethod()) { 18992bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian // C99 6.7.1p5: 19002bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian // The declaration of an identifier for a function that has 1901ec951e0c2fc0db00c36bc60c900331dde32c1b43Fariborz Jahanian // block scope shall have no explicit storage-class specifier 19024c73307c74764ba99e1379677fe92af72f676531Fariborz Jahanian // other than extern 19034c73307c74764ba99e1379677fe92af72f676531Fariborz Jahanian // See also (C++ [dcl.stc]p4). 19042acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner Diag(D.getDeclSpec().getStorageClassSpecLoc(), 19054c73307c74764ba99e1379677fe92af72f676531Fariborz Jahanian diag::err_static_block_func); 19066f40e2244b0590f144c5ceee07981a962fbbc72eFariborz Jahanian SC = FunctionDecl::None; 190725dba5d294364fa8339091e4d9e6a8f5db008377Fariborz Jahanian } else 190825dba5d294364fa8339091e4d9e6a8f5db008377Fariborz Jahanian SC = FunctionDecl::Static; 190925dba5d294364fa8339091e4d9e6a8f5db008377Fariborz Jahanian break; 19106f40e2244b0590f144c5ceee07981a962fbbc72eFariborz Jahanian } 19116f40e2244b0590f144c5ceee07981a962fbbc72eFariborz Jahanian case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 19122acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner } 19136f40e2244b0590f144c5ceee07981a962fbbc72eFariborz Jahanian 19146f40e2244b0590f144c5ceee07981a962fbbc72eFariborz Jahanian bool isInline = D.getDeclSpec().isInlineSpecified(); 19156f40e2244b0590f144c5ceee07981a962fbbc72eFariborz Jahanian bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 191625dba5d294364fa8339091e4d9e6a8f5db008377Fariborz Jahanian bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 191725dba5d294364fa8339091e4d9e6a8f5db008377Fariborz Jahanian 191825dba5d294364fa8339091e4d9e6a8f5db008377Fariborz Jahanian // Check that the return type is not an abstract class type. 19192acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner // For record types, this is done by the AbstractClassUsageDiagnoser once 192025dba5d294364fa8339091e4d9e6a8f5db008377Fariborz Jahanian // the class has been completely parsed. 19216f40e2244b0590f144c5ceee07981a962fbbc72eFariborz Jahanian if (!DC->isRecord() && 19226f40e2244b0590f144c5ceee07981a962fbbc72eFariborz Jahanian RequireNonAbstractType(D.getIdentifierLoc(), 1923a5c04344fa70d6eec34344760c1fe511e16f2d76Jay Foad R->getAsFunctionType()->getResultType(), 19244c73307c74764ba99e1379677fe92af72f676531Fariborz Jahanian diag::err_abstract_type_in_decl, 19252bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian AbstractReturnType)) 192645c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor InvalidDecl = true; 192745c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor 192845c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor // Do not allow returning a objc interface by-value. 192945c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { 193045c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor Diag(D.getIdentifierLoc(), 193145c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor diag::err_object_cannot_be_passed_returned_by_value) << 0 193245c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor << R->getAsFunctionType()->getResultType(); 193345c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor InvalidDecl = true; 193445c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor } 193545c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor 193645c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor bool isVirtualOkay = false; 193745c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor FunctionDecl *NewFD; 193845c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor if (D.getKind() == Declarator::DK_Constructor) { 193945c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor // This is a C++ constructor declaration. 194045c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor assert(DC->isRecord() && 194145c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor "Constructors can only be declared in a member context"); 194245c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor 194345c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 194445c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor 194545c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor // Create the new declaration 194645c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor NewFD = CXXConstructorDecl::Create(Context, 194745c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor cast<CXXRecordDecl>(DC), 194845c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor D.getIdentifierLoc(), Name, R, 194945c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor isExplicit, isInline, 195045c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor /*isImplicitlyDeclared=*/false); 195145c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor 195245c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor if (InvalidDecl) 195345c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor NewFD->setInvalidDecl(); 195445c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor } else if (D.getKind() == Declarator::DK_Destructor) { 195545c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor // This is a C++ destructor declaration. 195645c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor if (DC->isRecord()) { 195745c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 195845c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor 195945c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor NewFD = CXXDestructorDecl::Create(Context, 19602bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian cast<CXXRecordDecl>(DC), 19611d236ab930816f5da27bade92904914c44b73b4cBenjamin Kramer D.getIdentifierLoc(), Name, R, 19622bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian isInline, 19632bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian /*isImplicitlyDeclared=*/false); 19644c73307c74764ba99e1379677fe92af72f676531Fariborz Jahanian 19652bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian if (InvalidDecl) 19662bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian NewFD->setInvalidDecl(); 19672bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian 19682bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian isVirtualOkay = true; 19692bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian } else { 19702bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1971cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian 1972cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian // Create a FunctionDecl to satisfy the function definition parsing 19732bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian // code path. 19742bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 19752bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian Name, R, SC, isInline, 19762bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian /*hasPrototype=*/true, 1977803d307a5385059b1a84dfe9706ab158c80a20dcRafael Espindola // FIXME: Move to DeclGroup... 1978cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian D.getDeclSpec().getSourceRange().getBegin()); 1979cf8e168baf75b7ede6493d0373d64545c29c1a90Fariborz Jahanian InvalidDecl = true; 1980a5c04344fa70d6eec34344760c1fe511e16f2d76Jay Foad NewFD->setInvalidDecl(); 19812bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian } 19822bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian } else if (D.getKind() == Declarator::DK_Conversion) { 19832acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner if (!DC->isRecord()) { 19842bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian Diag(D.getIdentifierLoc(), 19852bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian diag::err_conv_function_not_member); 19862bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian return 0; 198745c4ea75b235de94f44bf96843624e6a559e4c00Douglas Gregor } else { 19882bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 19892bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian 19902bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 19912bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian D.getIdentifierLoc(), Name, R, 1992ec951e0c2fc0db00c36bc60c900331dde32c1b43Fariborz Jahanian isInline, isExplicit); 1993ec951e0c2fc0db00c36bc60c900331dde32c1b43Fariborz Jahanian 1994bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor if (InvalidDecl) 1995bcfd1f55bfbb3e5944cd5e03d07b343e280838c4Douglas Gregor NewFD->setInvalidDecl(); 19962bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian 19972bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian isVirtualOkay = true; 19982bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian } 19992bb5ddaff86ee73d2cea7ec1835978afc88a83f0Fariborz Jahanian } else if (DC->isRecord()) { 200033e982bf782d851bfe5767acb1336fcf3419ac6bFariborz Jahanian // This is a C++ method declaration. 200133e982bf782d851bfe5767acb1336fcf3419ac6bFariborz Jahanian NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 20020815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor D.getIdentifierLoc(), Name, R, 20030815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor (SC == FunctionDecl::Static), isInline); 20040815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor 20050815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor isVirtualOkay = (SC != FunctionDecl::Static); 20060815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor } else { 20070815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // Determine whether the function was written with a 20080815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // prototype. This true when: 20090815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // - we're in C++ (where every function has a prototype), 20100815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // - there is a prototype in the declarator, or 20110815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // - the type R of the function is some kind of typedef or other reference 20120815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // to a type name (which eventually refers to a function type). 20130815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor bool HasPrototype = 20140815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor getLangOptions().CPlusPlus || 20150815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 20160815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 20170815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor 20180815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor NewFD = FunctionDecl::Create(Context, DC, 20190815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor D.getIdentifierLoc(), 20200815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor Name, R, SC, isInline, HasPrototype, 20210815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // FIXME: Move to DeclGroup... 20220815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor D.getDeclSpec().getSourceRange().getBegin()); 20230815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor } 20240815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor 20250815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // Set the lexical context. If the declarator has a C++ 20260815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // scope specifier, the lexical context will be different 20270815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // from the semantic context. 20280815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor NewFD->setLexicalDeclContext(CurContext); 20290815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor 20300815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // C++ [dcl.fct.spec]p5: 20310815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // The virtual specifier shall only be used in declarations of 20320815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // nonstatic class member functions that appear within a 20330815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // member-specification of a class declaration; see 10.3. 20340815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // 20350815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // FIXME: Checking the 'virtual' specifier is not sufficient. A 20360815b579b31cb3129f732bb7ea36fd6ba6949e98Douglas Gregor // function is also virtual if it overrides an already virtual 20376143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // function. This is important to do here because it's part of the 20381e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar // declaration. 20396143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar if (isVirtual && !InvalidDecl) { 204064f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman if (!isVirtualOkay) { 204164f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman Diag(D.getDeclSpec().getVirtualSpecLoc(), 20423b8037a8c6f462e51f75c82b3d7fe1b8dbcf06c0Ken Dyck diag::err_virtual_non_function); 20431e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar } else if (!CurContext->isRecord()) { 20443b8037a8c6f462e51f75c82b3d7fe1b8dbcf06c0Ken Dyck // 'virtual' was specified outside of the class. 20451e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 20461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << CodeModificationHint::CreateRemoval( 2047dbb1ecc32ca122b07b7c98fd0a8f6f53985adaccChris Lattner SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 20481e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar } else { 20491eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Okay: Add virtual to the method. 20502f4eaef37476ae6891ede8ba215d0f6fd093629bBenjamin Kramer cast<CXXMethodDecl>(NewFD)->setVirtual(); 20511e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 20521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump CurClass->setAggregate(false); 20531e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar CurClass->setPOD(false); 20541e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar CurClass->setPolymorphic(true); 20551e04976fc2611d8cc06986a81deed4c42183b870Daniel Dunbar CurClass->setHasTrivialConstructor(false); 205664f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman } 205764f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman } 205864f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman 205964f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 206064f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman !CurContext->isRecord()) { 206164f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // C++ [class.static]p1: 206264f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // A data or function member of a class may be declared static 206364f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // in a class definition, in which case it is a static member of 206464f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // the class. 206564f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman 206664f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // Complain about the 'static' specifier if it's on an out-of-line 206764f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // member function definition. 206864f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman Diag(D.getDeclSpec().getStorageClassSpecLoc(), 206964f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman diag::err_static_out_of_line) 207064f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman << CodeModificationHint::CreateRemoval( 207164f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 207264f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman } 207364f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman 207464f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // Handle GNU asm-label extension (encoded as an attribute). 207564f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman if (Expr *E = (Expr*) D.getAsmLabel()) { 207664f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // The parser guarantees this is a string. 207764f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman StringLiteral *SE = cast<StringLiteral>(E); 207864f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 207964f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman SE->getByteLength()))); 208064f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman } 208164f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman 208264f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // Copy the parameter declarations from the declarator D to 208364f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // the function declaration NewFD, if they are available. 208464f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman if (D.getNumTypeObjects() > 0) { 208564f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 208664f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman 208764f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // Create Decl objects for each parameter, adding them to the 20886143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // FunctionDecl. 20896143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar llvm::SmallVector<ParmVarDecl*, 16> Params; 20906143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar 20916143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 20926143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // function that takes no arguments, not a function that takes a 20937eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman // single void argument. 2094a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // We let through "const void" here because Sema::GetTypeForDeclarator 209564f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // already checks for that case. 209664f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 209764f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman FTI.ArgInfo[0].Param && 209864f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 20997eb79c1010c8d30b852768bec96e81cd3e6def2eEli Friedman // empty arg list, don't push any params. 210064f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 210164f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman 210264f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // In C++, the empty parameter-type-list must be spelled "void"; a 210364f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman // typedef of void is not permitted. 210464f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman if (getLangOptions().CPlusPlus && 210564f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman Param->getType().getUnqualifiedType() != Context.VoidTy) { 210664f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman Diag(Param->getLocation(), diag::err_param_typedef_of_void); 210764f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman } 210864f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 210964f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 211064f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 211164f45a24b19eb89ff88f7c3ff0df9be8e861ac97Eli Friedman } 21126143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar 21136143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar NewFD->setParams(Context, &Params[0], Params.size()); 2114eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner } else if (R->getAsTypedefType()) { 2115eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner // When we're declaring a function with a typedef, as in the 2116eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner // following example, we'll need to synthesize (unnamed) 2117eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner // parameters for use in the declaration. 2118eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner // 2119eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner // @code 2120a210f350fa78c263caa26e0f999cce85bb235309Eli Friedman // typedef void fn(int); 2121a210f350fa78c263caa26e0f999cce85bb235309Eli Friedman // fn f; 2122eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner // @endcode 2123eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner const FunctionProtoType *FT = R->getAsFunctionProtoType(); 2124eaf2bb89eb2aad3b80673de30febe52df43c10ecChris Lattner if (!FT) { 2125a7ad98ff0919d6a24ea7c46634ea29bea551c1a0Chris Lattner // This is a typedef of a function with no prototype, so we 2126a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // don't need to do anything. 212745e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner } else if ((FT->getNumArgs() == 0) || 21285fabf9dbee29464bcd06cd09f8e569d1b850f948Daniel Dunbar (FT->getNumArgs() == 1 && !FT->isVariadic() && 2129a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall FT->getArgType(0)->isVoidType())) { 2130a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // This is a zero-argument function. We don't need to do anything. 21316143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar } else { 21320032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson // Synthesize a parameter for each argument type. 21330032b2781b4deb131f8c9b7968f2030bf2489cddOwen Anderson llvm::SmallVector<ParmVarDecl*, 16> Params; 21341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (FunctionProtoType::arg_type_iterator ArgType = FT->arg_type_begin(); 213545e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner ArgType != FT->arg_type_end(); ++ArgType) { 21361257bc6ee76b931e3f8e51a88298b95379963d24Rafael Espindola ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 21371257bc6ee76b931e3f8e51a88298b95379963d24Rafael Espindola SourceLocation(), 0, 21381257bc6ee76b931e3f8e51a88298b95379963d24Rafael Espindola *ArgType, VarDecl::None, 21391257bc6ee76b931e3f8e51a88298b95379963d24Rafael Espindola 0); 2140a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall Param->setImplicit(); 21411257bc6ee76b931e3f8e51a88298b95379963d24Rafael Espindola Params.push_back(Param); 21421257bc6ee76b931e3f8e51a88298b95379963d24Rafael Espindola } 214345e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner 214445e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner NewFD->setParams(Context, &Params[0], Params.size()); 21456143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar } 21466143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar } 21476143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar 21486143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // If name lookup finds a previous declaration that is not in the 21496143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // same scope as the new declaration, this may still be an 21506143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // acceptable redeclaration. 21516143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 21526143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar !(NewFD->hasLinkage() && 21535f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2154a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall PrevDecl = 0; 2155a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall 21568e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar // Perform semantic checking on the function declaration. 21578e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar bool OverloadableAttrRequired = false; // FIXME: HACK! 21588e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar if (CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 21598e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar /*FIXME:*/OverloadableAttrRequired)) 216095b851e55c328af4b69da7bfc1124bf258c0ffe5Chris Lattner InvalidDecl = true; 21618e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar 21628e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar if (D.getCXXScopeSpec().isSet() && !InvalidDecl) { 21638e5c2b8072f4409c7c0004331d1db9652d5209c0Daniel Dunbar // An out-of-line member function declaration must also be a 2164a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // definition (C++ [dcl.meaning]p1). 21651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!IsFunctionDefinition) { 2166a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 21679de4342ef79a18c706e46bc23f8f579f5add2375Benjamin Kramer << D.getCXXScopeSpec().getRange(); 216845e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner InvalidDecl = true; 2169a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall } else if (!Redeclaration) { 2170a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // The user tried to provide an out-of-line definition for a 2171a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // function that is a member of a class or namespace, but there 2172a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // was no such member function declared (C++ [class.mfct]p2, 2173a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // C++ [namespace.memdef]p2). For example: 2174a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // 217545e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner // class X { 217645e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner // void f() const; 2177a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // }; 2178a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // 2179a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall // void X::f() { } // ill-formed 218045e8cbdce25c2e16c7aac2036a591f6190097ae6Chris Lattner // 21816143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // Complain about this problem, and attempt to suggest close 21826143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar // matches (e.g., those that differ only in cv-qualifiers and 21839de4342ef79a18c706e46bc23f8f579f5add2375Benjamin Kramer // whether the parameter types are references). 21846143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 21859de4342ef79a18c706e46bc23f8f579f5add2375Benjamin Kramer << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2186a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall InvalidDecl = true; 2187a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall 21885f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2189a5e19c6b2554f6d9c4b9850d4dbbbfa3643282e5John McCall true); 21906143293fa4366ee95d7e47e61bd030a34bf68b55Daniel Dunbar assert(!Prev.isAmbiguous() && 219141071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar "Cannot have an ambiguity in previous-declaration lookup"); 2192af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2193af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar Func != FuncEnd; ++Func) { 21941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (isa<FunctionDecl>(*Func) && 2195af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 21961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag((*Func)->getLocation(), diag::note_member_def_close_match); 219717945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis } 2198af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar 21991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump PrevDecl = 0; 2200af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar } 2201af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar } 2202af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar 2203af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // Handle attributes. We need to have merged decls when handling attributes 2204af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // (for example to check for conflicts, etc). 2205af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // FIXME: This needs to happen before we merge declarations. Then, 2206af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // let attribute merging cope with attribute conflicts. 2207af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar ProcessDeclAttributes(NewFD, D); 2208af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar AddKnownFunctionAttributes(NewFD); 220917945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis 2210fef30b55230064d334a669a065a1c9acdb87cdfeFariborz Jahanian if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2211fef30b55230064d334a669a065a1c9acdb87cdfeFariborz Jahanian // If a function name is overloadable in C, then every function 2212af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // with that name must be marked "overloadable". 221317945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2214fef30b55230064d334a669a065a1c9acdb87cdfeFariborz Jahanian << Redeclaration << NewFD; 2215fef30b55230064d334a669a065a1c9acdb87cdfeFariborz Jahanian if (PrevDecl) 2216af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar Diag(PrevDecl->getLocation(), 2217af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar diag::note_attribute_overloadable_prev_overload); 2218af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar NewFD->addAttr(::new (Context) OverloadableAttr()); 2219af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar } 2220e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall 2221db8264e4c5ffd7af6fbad4ca4306bd382bb02691Jordy Rose // If this is a locally-scoped extern C function, update the 2222db8264e4c5ffd7af6fbad4ca4306bd382bb02691Jordy Rose // map of such names. 2223e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2224e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall && !InvalidDecl) 2225e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2226e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall 2227e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall return NewFD; 2228e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall} 2229e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall 2230109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian/// \brief Perform semantic checking of a new function declaration. 2231109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian/// 2232109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian/// Performs semantic analysis of the new function declaration 2233e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall/// NewFD. This routine performs all semantic checking that does not 2234e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall/// require the actual declarator involved in the declaration, and is 2235e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall/// used both for the declaration of functions as they are parsed 2236e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall/// (called via ActOnDeclarator) and for the declaration of functions 2237e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall/// that have been instantiated via C++ template instantiation (called 2238e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall/// via InstantiateDecl). 223975cf3e86d33ce810c12084126385371b335c30baArgyrios Kyrtzidis/// 224075cf3e86d33ce810c12084126385371b335c30baArgyrios Kyrtzidis/// \returns true if there was an error, false otherwise. 224175cf3e86d33ce810c12084126385371b335c30baArgyrios Kyrtzidisbool Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 224275cf3e86d33ce810c12084126385371b335c30baArgyrios Kyrtzidis bool &Redeclaration, 2243e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall bool &OverloadableAttrRequired) { 2244e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall bool InvalidDecl = false; 2245f85e193739c953358c865005855253af4f68a497John McCall 2246e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall // Semantic checking for this function declaration (in isolation). 2247e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall if (getLangOptions().CPlusPlus) { 2248e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall // C++-specific checks. 2249e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 2250827bbcc8a9115782693b21030a45378abe5c1862David Chisnall InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 2251109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian else if (isa<CXXDestructorDecl>(NewFD)) { 2252109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2253e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall Record->setUserDeclaredDestructor(true); 2254e81ac69c5da9fadfac33ee76e98d5fb558c4e389John McCall // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2255109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian // user-defined destructor. 2256109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian Record->setPOD(false); 2257109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian 225811d77169555480ee0a04c6e5bc390d8fde41175dArgyrios Kyrtzidis // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 225911d77169555480ee0a04c6e5bc390d8fde41175dArgyrios Kyrtzidis // declared destructor. 2260109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian Record->setHasTrivialDestructor(false); 226175cf3e86d33ce810c12084126385371b335c30baArgyrios Kyrtzidis } else if (CXXConversionDecl *Conversion 226275cf3e86d33ce810c12084126385371b335c30baArgyrios Kyrtzidis = dyn_cast<CXXConversionDecl>(NewFD)) 226375cf3e86d33ce810c12084126385371b335c30baArgyrios Kyrtzidis ActOnConversionDeclarator(Conversion); 226475cf3e86d33ce810c12084126385371b335c30baArgyrios Kyrtzidis 226575cf3e86d33ce810c12084126385371b335c30baArgyrios Kyrtzidis // Extra checking for C++ overloaded operators (C++ [over.oper]). 2266109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian if (NewFD->isOverloadedOperator() && 2267109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian CheckOverloadedOperatorDeclaration(NewFD)) 2268109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian InvalidDecl = true; 2269f85e193739c953358c865005855253af4f68a497John McCall } 2270109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian 2271109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian // Check for a previous declaration of this name. 227291e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson if (!PrevDecl && NewFD->isExternC(Context)) { 2273984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson // Since we did not find anything by this name and we're declaring 227417945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis // an extern "C" function, look for a non-visible extern "C" 2275984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson // declaration with the same name. 2276984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2277984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2278984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson if (Pos != LocallyScopedExternalDecls.end()) 227991e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson PrevDecl = Pos->second; 228091e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson } 2281f976be8a63f9e0d3bd50e33dadef02c3c9921747Eli Friedman 2282f976be8a63f9e0d3bd50e33dadef02c3c9921747Eli Friedman // Merge or overload the declaration with an existing declaration of 228391e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson // the same name, if appropriate. 228491e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson if (PrevDecl) { 228591e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson // Determine whether NewFD is an overload of PrevDecl or 228691e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson // a declaration that requires merging. If it's an overload, 228717945a0f64fe03ff6ec0c2146005a87636e3ac12Argyrios Kyrtzidis // there's no more work to do here; we'll just add the new 228891e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson // function to the scope. 228991e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson OverloadedFunctionDecl::function_iterator MatchedDecl; 229091e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson 229191e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson if (!getLangOptions().CPlusPlus && 229241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar AllowOverloadingOfFunction(PrevDecl, Context)) { 229341071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar OverloadableAttrRequired = true; 229441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 229541071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar // Functions marked "overloadable" must have a prototype (that 229641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar // we can't get through declaration merging). 229741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar if (!NewFD->getType()->getAsFunctionProtoType()) { 229841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 229941071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar << NewFD; 230016e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor InvalidDecl = true; 230116e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor Redeclaration = true; 230216e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor 23031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Turn this into a variadic function with no parameters. 230441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar QualType R = Context.getFunctionType( 2305293361afd4199c92aabff9267fddea890943c586Anders Carlsson NewFD->getType()->getAsFunctionType()->getResultType(), 23062b77ba8bc7a842829ad9193816dc1d7d5e9c5be6Anders Carlsson 0, 0, true, 0); 230741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar NewFD->setType(R); 230816e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor } 23098387e2a41eef6fa17fb140a18c29b6eee9dd2b8aFrancois Pichet } 23108387e2a41eef6fa17fb140a18c29b6eee9dd2b8aFrancois Pichet 231116e8be2ac532358d4e413fdfa2643b1876edda78Douglas Gregor if (PrevDecl && 23121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump (!AllowOverloadingOfFunction(PrevDecl, Context) || 2313555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 2314555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson Redeclaration = true; 2315555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson Decl *OldDecl = PrevDecl; 231641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 2317555b4bb2749aea2ec8e2adc351a71ec1cb9bdc33Anders Carlsson // If PrevDecl was an overloaded function, extract the 231841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar // FunctionDecl that matched. 231941071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar if (isa<OverloadedFunctionDecl>(PrevDecl)) 232026fbc72b33bdbd20b0145bf117c64d373f8051e3John McCall OldDecl = *MatchedDecl; 232126fbc72b33bdbd20b0145bf117c64d373f8051e3John McCall 232226fbc72b33bdbd20b0145bf117c64d373f8051e3John McCall // NewFD and OldDecl represent declarations that need to be 232326fbc72b33bdbd20b0145bf117c64d373f8051e3John McCall // merged. 232426fbc72b33bdbd20b0145bf117c64d373f8051e3John McCall if (MergeFunctionDecl(NewFD, OldDecl)) 232595d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson InvalidDecl = true; 232641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 2327984e06874685396ca2cb51f0008cfff7c9b3d9c6Anders Carlsson if (!InvalidDecl) 232841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 23299cfbe48a7a20a217fdb2920b29b67ae7941cb116Douglas Gregor } 23309d0c6613ec040ad8d952556be909232a7f25dedeJohn McCall } 23319cfbe48a7a20a217fdb2920b29b67ae7941cb116Douglas Gregor 2332dd9967a6374c9a44be4af02aaeee340ffb82848fDouglas Gregor if (getLangOptions().CPlusPlus && !CurContext->isRecord()) { 2333127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor // In C++, check default arguments now that we have merged decls. Unless 2334127102b5196ffe04bdb70fd553fe62c265ab10a9Douglas Gregor // the lexical context is the class, because in this case this is done 23353e4c6c4c79a03f5cb0c4671d7c282d623c6dc35eRichard Smith // during delayed parsing anyway. 2336018837b081bd1a725bae1c020eb1649975b04d67Anders Carlsson CheckCXXDefaultArguments(NewFD); 23376a576ab708d3aa7d40e5d867ab1de5d3cb507553Douglas Gregor } 233815de72cf580840c61e5704c2f8a2b56f9d0638e1Douglas Gregor 23399cfbe48a7a20a217fdb2920b29b67ae7941cb116Douglas Gregor return InvalidDecl || NewFD->isInvalidDecl(); 234095d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson} 23411fe598c026dc03fddbd65efb8119eb1afd9b1520Anders Carlsson 23428387e2a41eef6fa17fb140a18c29b6eee9dd2b8aFrancois Pichetbool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 23438387e2a41eef6fa17fb140a18c29b6eee9dd2b8aFrancois Pichet // FIXME: Need strict checking. In C89, we need to check for 23441fe598c026dc03fddbd65efb8119eb1afd9b1520Anders Carlsson // any assignment, increment, decrement, function-calls, or 23451fe598c026dc03fddbd65efb8119eb1afd9b1520Anders Carlsson // commas outside of a sizeof. In C99, it's the same list, 234695d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson // except that the aforementioned are allowed in unevaluated 234795d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlsson // expressions. Everything else falls under the 234827ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson // "may accept other forms of constant expressions" exception. 23498387e2a41eef6fa17fb140a18c29b6eee9dd2b8aFrancois Pichet // (We never end up here for C++, so the constant expression 23508387e2a41eef6fa17fb140a18c29b6eee9dd2b8aFrancois Pichet // rules there don't matter.) 235127ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson if (Init->isConstantInitializer(Context)) 235227ae53665f8b00fe4ba21da0fa79a4ce6e0b6cd5Anders Carlsson return false; 235336674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 235436674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson << Init->getSourceRange(); 235536674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson return true; 235636674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson} 235736674d2978eb53962218ac67bb4d352cc287ea05Anders Carlsson 235895d4e5d2f87a0f07fb143ccb824dfc4c5c595c78Anders Carlssonvoid Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 23591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 236038e24c782c17b6058bf61d635747bbde19fb1bc7Fariborz Jahanian} 236141071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 236241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar/// AddInitializerToDecl - Adds the initializer Init to the 2363b31cb7f1752ea011fd06ac9574ce24667d11cbdbFariborz Jahanian/// declaration dcl. If DirectInit is true, this is C++ direct 236441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar/// initialization rather than copy initialization. 2365000835d0b04345c0014c603fe6339b3bc154050eFariborz Jahanianvoid Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2366baf101d1f96b4e41c9f2797875329840514f54f1Chris Lattner Decl *RealDecl = dcl.getAs<Decl>(); 2367baf101d1f96b4e41c9f2797875329840514f54f1Chris Lattner // If there is no declaration, there was an error parsing it. Just ignore 2368baf101d1f96b4e41c9f2797875329840514f54f1Chris Lattner // the initializer. 2369baf101d1f96b4e41c9f2797875329840514f54f1Chris Lattner if (RealDecl == 0) 2370baf101d1f96b4e41c9f2797875329840514f54f1Chris Lattner return; 2371baf101d1f96b4e41c9f2797875329840514f54f1Chris Lattner 2372285d0dba947b7c9960eaa88e8c4fced0398d4319Chris Lattner if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 237341071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar // With declarators parsed the way they are, the parser cannot 2374e926523105dd2604ccd5c101605dea43c5269965Peter Collingbourne // distinguish between a normal initializer and a pure-specifier. 237541071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar // Thus this grotesque test. 237641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar IntegerLiteral *IL; 237741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Expr *Init = static_cast<Expr *>(init.get()); 2378af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2379af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2380e926523105dd2604ccd5c101605dea43c5269965Peter Collingbourne if (Method->isVirtual()) { 238141071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Method->setPure(); 238241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 2383af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar // A class is abstract if at least one function is pure virtual. 2384af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2385000835d0b04345c0014c603fe6339b3bc154050eFariborz Jahanian } else if (!Method->isInvalidDecl()) { 2386000835d0b04345c0014c603fe6339b3bc154050eFariborz Jahanian Diag(Method->getLocation(), diag::err_non_virtual_pure) 2387af05bb9073319d8381b71c4325188853fd4b8ed6Daniel Dunbar << Method->getDeclName() << Init->getSourceRange(); 2388109dfc6ca6652f60c55ed0f2631aebf323d0200dFariborz Jahanian Method->setInvalidDecl(); 2389e926523105dd2604ccd5c101605dea43c5269965Peter Collingbourne } 239041071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar } else { 23911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(Method->getLocation(), diag::err_member_function_initialization) 239241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar << Method->getDeclName() << Init->getSourceRange(); 239341071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Method->setInvalidDecl(); 239441071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar } 23956fb0aee4f9dc261bbec72e1283ad8dc0557a6d96Argyrios Kyrtzidis return; 239641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar } 239741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 239841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 23991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump if (!VDecl) { 2400305c658ebce84bb9833fc0e7675554656453b8e8Fariborz Jahanian if (getLangOptions().CPlusPlus && 240141071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar RealDecl->getLexicalDeclContext()->isRecord() && 240241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar isa<NamedDecl>(RealDecl)) 240391e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson Diag(RealDecl->getLocation(), diag::err_member_initialization) 240491e20dd8bf1bc8980ee93839383d2bd170bce050Anders Carlsson << cast<NamedDecl>(RealDecl)->getDeclName(); 240541071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar else 240641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 240741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar RealDecl->setInvalidDecl(); 240841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar return; 24095f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner } 24101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 241141071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar if (!VDecl->getType()->isArrayType() && 241241071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 241341071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar diag::err_typecheck_decl_incomplete_type)) { 24149f5bff086cad25c15b4deb8a7763786097aadccdChris Lattner RealDecl->setInvalidDecl(); 24159f5bff086cad25c15b4deb8a7763786097aadccdChris Lattner return; 241641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar } 24178d04258483be6583f0865464234d014807a3e1ccBenjamin Kramer 241841071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar const VarDecl *Def = 0; 241941071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar if (VDecl->getDefinition(Def)) { 24201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump Diag(VDecl->getLocation(), diag::err_redefinition) 24211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump << VDecl->getDeclName(); 2422f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump Diag(Def->getLocation(), diag::note_previous_definition); 2423f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump VDecl->setInvalidDecl(); 2424f5408fe484495ee4efbdd709c8a2c2fdbbbdb328Mike Stump return; 242541071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar } 242641071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar 242741071debe9b8887449c3f2ee0dd7124ed47bdda8Daniel Dunbar // Take ownership of the expression, now that we're sure we have somewhere 2428744016dde06fcffd50931e94a98c850f8b12cd87John McCall // to put it. 2429744016dde06fcffd50931e94a98c850f8b12cd87John McCall Expr *Init = static_cast<Expr *>(init.release()); 2430744016dde06fcffd50931e94a98c850f8b12cd87John McCall assert(Init && "missing initializer"); 2431744016dde06fcffd50931e94a98c850f8b12cd87John McCall 2432744016dde06fcffd50931e94a98c850f8b12cd87John McCall // Get the decls type and save a reference for later, since 24332acc6e3feda5e4f7d9009bdcf8b1cd777fecfe2dChris Lattner // CheckInitializerTypes may change it. 2434744016dde06fcffd50931e94a98c850f8b12cd87John McCall QualType DclT = VDecl->getType(), SavT = DclT; 2435744016dde06fcffd50931e94a98c850f8b12cd87John McCall if (VDecl->isBlockVarDecl()) { 2436744016dde06fcffd50931e94a98c850f8b12cd87John McCall if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 2437744016dde06fcffd50931e94a98c850f8b12cd87John McCall Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2438744016dde06fcffd50931e94a98c850f8b12cd87John McCall VDecl->setInvalidDecl(); 2439744016dde06fcffd50931e94a98c850f8b12cd87John McCall } else if (!VDecl->isInvalidDecl()) { 2440744016dde06fcffd50931e94a98c850f8b12cd87John McCall if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2441744016dde06fcffd50931e94a98c850f8b12cd87John McCall VDecl->getDeclName(), DirectInit)) 2442744016dde06fcffd50931e94a98c850f8b12cd87John McCall VDecl->setInvalidDecl(); 2443744016dde06fcffd50931e94a98c850f8b12cd87John McCall 2444744016dde06fcffd50931e94a98c850f8b12cd87John McCall // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2445744016dde06fcffd50931e94a98c850f8b12cd87John McCall // Don't check invalid declarations to avoid emitting useless diagnostics. 2446744016dde06fcffd50931e94a98c850f8b12cd87John McCall if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2447744016dde06fcffd50931e94a98c850f8b12cd87John McCall if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 2448744016dde06fcffd50931e94a98c850f8b12cd87John McCall CheckForConstantInitializer(Init, DclT); 2449744016dde06fcffd50931e94a98c850f8b12cd87John McCall } 24506f141659cab11109d9931d92d0988f8850778de3Jay Foad } 2451744016dde06fcffd50931e94a98c850f8b12cd87John McCall } else if (VDecl->isStaticDataMember() && 2452744016dde06fcffd50931e94a98c850f8b12cd87John McCall VDecl->getLexicalDeclContext()->isRecord()) { 2453744016dde06fcffd50931e94a98c850f8b12cd87John McCall // This is an in-class initialization for a static data member, e.g., 2454744016dde06fcffd50931e94a98c850f8b12cd87John McCall // 2455744016dde06fcffd50931e94a98c850f8b12cd87John McCall // struct S { 2456744016dde06fcffd50931e94a98c850f8b12cd87John McCall // static const int value = 17; 2457744016dde06fcffd50931e94a98c850f8b12cd87John McCall // }; 2458744016dde06fcffd50931e94a98c850f8b12cd87John McCall 2459744016dde06fcffd50931e94a98c850f8b12cd87John McCall // Attach the initializer 2460744016dde06fcffd50931e94a98c850f8b12cd87John McCall VDecl->setInit(Init); 2461744016dde06fcffd50931e94a98c850f8b12cd87John McCall 2462744016dde06fcffd50931e94a98c850f8b12cd87John McCall // C++ [class.mem]p4: 2463744016dde06fcffd50931e94a98c850f8b12cd87John McCall // A member-declarator can contain a constant-initializer only 24645f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner // if it declares a static member (9.4) of const integral or 2465744016dde06fcffd50931e94a98c850f8b12cd87John McCall // const enumeration type, see 9.4.2. 2466744016dde06fcffd50931e94a98c850f8b12cd87John McCall QualType T = VDecl->getType(); 2467744016dde06fcffd50931e94a98c850f8b12cd87John McCall if (!T->isDependentType() && 2468744016dde06fcffd50931e94a98c850f8b12cd87John McCall (!Context.getCanonicalType(T).isConstQualified() || 2469744016dde06fcffd50931e94a98c850f8b12cd87John McCall !T->isIntegralType())) { 2470744016dde06fcffd50931e94a98c850f8b12cd87John McCall Diag(VDecl->getLocation(), diag::err_member_initialization) 2471744016dde06fcffd50931e94a98c850f8b12cd87John McCall << VDecl->getDeclName() << Init->getSourceRange(); 2472744016dde06fcffd50931e94a98c850f8b12cd87John McCall VDecl->setInvalidDecl(); 2473744016dde06fcffd50931e94a98c850f8b12cd87John McCall } else { 2474744016dde06fcffd50931e94a98c850f8b12cd87John McCall // C++ [class.static.data]p4: 2475744016dde06fcffd50931e94a98c850f8b12cd87John McCall // If a static data member is of const integral or const 2476744016dde06fcffd50931e94a98c850f8b12cd87John McCall // enumeration type, its declaration in the class definition 2477744016dde06fcffd50931e94a98c850f8b12cd87John McCall // can specify a constant-initializer which shall be an 2478744016dde06fcffd50931e94a98c850f8b12cd87John McCall // integral constant expression (5.19). 2479744016dde06fcffd50931e94a98c850f8b12cd87John McCall if (!Init->isTypeDependent() && 2480744016dde06fcffd50931e94a98c850f8b12cd87John McCall !Init->getType()->isIntegralType()) { 2481744016dde06fcffd50931e94a98c850f8b12cd87John McCall // We have a non-dependent, non-integral or enumeration type. 2482744016dde06fcffd50931e94a98c850f8b12cd87John McCall Diag(Init->getSourceRange().getBegin(), 2483744016dde06fcffd50931e94a98c850f8b12cd87John McCall diag::err_in_class_initializer_non_integral_type) 2484744016dde06fcffd50931e94a98c850f8b12cd87John McCall << Init->getType() << Init->getSourceRange(); 2485744016dde06fcffd50931e94a98c850f8b12cd87John McCall VDecl->setInvalidDecl(); 2486744016dde06fcffd50931e94a98c850f8b12cd87John McCall } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2487744016dde06fcffd50931e94a98c850f8b12cd87John McCall // Check whether the expression is a constant expression. 2488744016dde06fcffd50931e94a98c850f8b12cd87John McCall llvm::APSInt Value; 2489744016dde06fcffd50931e94a98c850f8b12cd87John McCall SourceLocation Loc; 2490744016dde06fcffd50931e94a98c850f8b12cd87John McCall if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 24916f141659cab11109d9931d92d0988f8850778de3Jay Foad Diag(Loc, diag::err_in_class_initializer_non_constant) 2492744016dde06fcffd50931e94a98c850f8b12cd87John McCall << Init->getSourceRange(); 2493744016dde06fcffd50931e94a98c850f8b12cd87John McCall VDecl->setInvalidDecl(); 2494744016dde06fcffd50931e94a98c850f8b12cd87John McCall } else if (!VDecl->getType()->isDependentType()) 2495744016dde06fcffd50931e94a98c850f8b12cd87John McCall ImpCastExprToType(Init, VDecl->getType()); 2496744016dde06fcffd50931e94a98c850f8b12cd87John McCall } 2497744016dde06fcffd50931e94a98c850f8b12cd87John McCall } 2498673431a2986f750b4d8fadb57abf3f00db27bbbdDaniel Dunbar } else if (VDecl->isFileVarDecl()) { 24993dc05418538c719fea48b906bfa4febe5296e126Nick Lewycky if (VDecl->getStorageClass() == VarDecl::Extern) 25003dc05418538c719fea48b906bfa4febe5296e126Nick Lewycky Diag(VDecl->getLocation(), diag::warn_extern_init); 25015ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky if (!VDecl->isInvalidDecl()) 25025ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 25035ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky VDecl->getDeclName(), DirectInit)) 25043dc05418538c719fea48b906bfa4febe5296e126Nick Lewycky VDecl->setInvalidDecl(); 25053dc05418538c719fea48b906bfa4febe5296e126Nick Lewycky 25065ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky // C++ 3.6.2p2, allow dynamic initialization of static initializers. 25075ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky // Don't check invalid declarations to avoid emitting useless diagnostics. 25083dc05418538c719fea48b906bfa4febe5296e126Nick Lewycky if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 25095ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky // C99 6.7.8p4. All file scoped initializers need to be constant. 25105ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky CheckForConstantInitializer(Init, DclT); 25115ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky } 25125ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky } 25135ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky // If the type changed, it means we had an incomplete type that was 25145ea4f44e34449a78d6b38aa47c14b527839d7aacNick Lewycky // completed by the initializer. For example: 2515 // int ary[] = { 1, 3, 5 }; 2516 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2517 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2518 VDecl->setType(DclT); 2519 Init->setType(DclT); 2520 } 2521 2522 // Attach the initializer to the decl. 2523 VDecl->setInit(Init); 2524 return; 2525} 2526 2527void Sema::ActOnUninitializedDecl(DeclPtrTy dcl) { 2528 Decl *RealDecl = dcl.getAs<Decl>(); 2529 2530 // If there is no declaration, there was an error parsing it. Just ignore it. 2531 if (RealDecl == 0) 2532 return; 2533 2534 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2535 QualType Type = Var->getType(); 2536 // C++ [dcl.init.ref]p3: 2537 // The initializer can be omitted for a reference only in a 2538 // parameter declaration (8.3.5), in the declaration of a 2539 // function return type, in the declaration of a class member 2540 // within its class declaration (9.2), and where the extern 2541 // specifier is explicitly used. 2542 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 2543 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2544 << Var->getDeclName() 2545 << SourceRange(Var->getLocation(), Var->getLocation()); 2546 Var->setInvalidDecl(); 2547 return; 2548 } 2549 2550 // C++ [dcl.init]p9: 2551 // 2552 // If no initializer is specified for an object, and the object 2553 // is of (possibly cv-qualified) non-POD class type (or array 2554 // thereof), the object shall be default-initialized; if the 2555 // object is of const-qualified type, the underlying class type 2556 // shall have a user-declared default constructor. 2557 if (getLangOptions().CPlusPlus) { 2558 QualType InitType = Type; 2559 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2560 InitType = Array->getElementType(); 2561 if (!Var->hasExternalStorage() && InitType->isRecordType()) { 2562 CXXRecordDecl *RD = 2563 cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); 2564 CXXConstructorDecl *Constructor = 0; 2565 if (!RequireCompleteType(Var->getLocation(), InitType, 2566 diag::err_invalid_incomplete_type_use)) 2567 Constructor 2568 = PerformInitializationByConstructor(InitType, 0, 0, 2569 Var->getLocation(), 2570 SourceRange(Var->getLocation(), 2571 Var->getLocation()), 2572 Var->getDeclName(), 2573 IK_Default); 2574 if (!Constructor) 2575 Var->setInvalidDecl(); 2576 else if (!RD->hasTrivialConstructor()) 2577 InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); 2578 } 2579 } 2580 2581#if 0 2582 // FIXME: Temporarily disabled because we are not properly parsing 2583 // linkage specifications on declarations, e.g., 2584 // 2585 // extern "C" const CGPoint CGPointerZero; 2586 // 2587 // C++ [dcl.init]p9: 2588 // 2589 // If no initializer is specified for an object, and the 2590 // object is of (possibly cv-qualified) non-POD class type (or 2591 // array thereof), the object shall be default-initialized; if 2592 // the object is of const-qualified type, the underlying class 2593 // type shall have a user-declared default 2594 // constructor. Otherwise, if no initializer is specified for 2595 // an object, the object and its subobjects, if any, have an 2596 // indeterminate initial value; if the object or any of its 2597 // subobjects are of const-qualified type, the program is 2598 // ill-formed. 2599 // 2600 // This isn't technically an error in C, so we don't diagnose it. 2601 // 2602 // FIXME: Actually perform the POD/user-defined default 2603 // constructor check. 2604 if (getLangOptions().CPlusPlus && 2605 Context.getCanonicalType(Type).isConstQualified() && 2606 !Var->hasExternalStorage()) 2607 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2608 << Var->getName() 2609 << SourceRange(Var->getLocation(), Var->getLocation()); 2610#endif 2611 } 2612} 2613 2614Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, DeclPtrTy *Group, 2615 unsigned NumDecls) { 2616 llvm::SmallVector<Decl*, 8> Decls; 2617 2618 for (unsigned i = 0; i != NumDecls; ++i) 2619 if (Decl *D = Group[i].getAs<Decl>()) 2620 Decls.push_back(D); 2621 2622 // Perform semantic analysis that depends on having fully processed both 2623 // the declarator and initializer. 2624 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 2625 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 2626 if (!IDecl) 2627 continue; 2628 QualType T = IDecl->getType(); 2629 2630 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2631 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2632 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 2633 if (!IDecl->isInvalidDecl() && 2634 RequireCompleteType(IDecl->getLocation(), T, 2635 diag::err_typecheck_decl_incomplete_type)) 2636 IDecl->setInvalidDecl(); 2637 } 2638 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2639 // object that has file scope without an initializer, and without a 2640 // storage-class specifier or with the storage-class specifier "static", 2641 // constitutes a tentative definition. Note: A tentative definition with 2642 // external linkage is valid (C99 6.2.2p5). 2643 if (IDecl->isTentativeDefinition(Context)) { 2644 QualType CheckType = T; 2645 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2646 2647 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2648 if (ArrayT) { 2649 CheckType = ArrayT->getElementType(); 2650 DiagID = diag::err_illegal_decl_array_incomplete_type; 2651 } 2652 2653 if (IDecl->isInvalidDecl()) { 2654 // Do nothing with invalid declarations 2655 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2656 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2657 // C99 6.9.2p3: If the declaration of an identifier for an object is 2658 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2659 // declared type shall not be an incomplete type. 2660 IDecl->setInvalidDecl(); 2661 } 2662 } 2663 } 2664 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 2665 &Decls[0], Decls.size())); 2666} 2667 2668 2669/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2670/// to introduce parameters into function prototype scope. 2671Sema::DeclPtrTy 2672Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2673 const DeclSpec &DS = D.getDeclSpec(); 2674 2675 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2676 VarDecl::StorageClass StorageClass = VarDecl::None; 2677 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2678 StorageClass = VarDecl::Register; 2679 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2680 Diag(DS.getStorageClassSpecLoc(), 2681 diag::err_invalid_storage_class_in_func_decl); 2682 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2683 } 2684 if (DS.isThreadSpecified()) { 2685 Diag(DS.getThreadSpecLoc(), 2686 diag::err_invalid_storage_class_in_func_decl); 2687 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2688 } 2689 DiagnoseFunctionSpecifiers(D); 2690 2691 // Check that there are no default arguments inside the type of this 2692 // parameter (C++ only). 2693 if (getLangOptions().CPlusPlus) 2694 CheckExtraCXXDefaultArguments(D); 2695 2696 // In this context, we *do not* check D.getInvalidType(). If the declarator 2697 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2698 // though it will not reflect the user specified type. 2699 QualType parmDeclType = GetTypeForDeclarator(D, S); 2700 if (parmDeclType.isNull()) { 2701 D.setInvalidType(true); 2702 parmDeclType = Context.IntTy; 2703 } 2704 2705 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2706 // Can this happen for params? We already checked that they don't conflict 2707 // among each other. Here they can only shadow globals, which is ok. 2708 IdentifierInfo *II = D.getIdentifier(); 2709 if (II) { 2710 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2711 if (PrevDecl->isTemplateParameter()) { 2712 // Maybe we will complain about the shadowed template parameter. 2713 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2714 // Just pretend that we didn't see the previous declaration. 2715 PrevDecl = 0; 2716 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 2717 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2718 2719 // Recover by removing the name 2720 II = 0; 2721 D.SetIdentifier(0, D.getIdentifierLoc()); 2722 } 2723 } 2724 } 2725 2726 // Parameters can not be abstract class types. 2727 // For record types, this is done by the AbstractClassUsageDiagnoser once 2728 // the class has been completely parsed. 2729 if (!CurContext->isRecord() && 2730 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 2731 diag::err_abstract_type_in_decl, 2732 AbstractParamType)) 2733 D.setInvalidType(true); 2734 2735 QualType T = adjustParameterType(parmDeclType); 2736 2737 ParmVarDecl *New; 2738 if (T == parmDeclType) // parameter type did not need adjustment 2739 New = ParmVarDecl::Create(Context, CurContext, 2740 D.getIdentifierLoc(), II, 2741 parmDeclType, StorageClass, 2742 0); 2743 else // keep track of both the adjusted and unadjusted types 2744 New = OriginalParmVarDecl::Create(Context, CurContext, 2745 D.getIdentifierLoc(), II, T, 2746 parmDeclType, StorageClass, 0); 2747 2748 if (D.getInvalidType()) 2749 New->setInvalidDecl(); 2750 2751 // Parameter declarators cannot be interface types. All ObjC objects are 2752 // passed by reference. 2753 if (T->isObjCInterfaceType()) { 2754 Diag(D.getIdentifierLoc(), 2755 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 2756 New->setInvalidDecl(); 2757 } 2758 2759 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2760 if (D.getCXXScopeSpec().isSet()) { 2761 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2762 << D.getCXXScopeSpec().getRange(); 2763 New->setInvalidDecl(); 2764 } 2765 2766 // Add the parameter declaration into this scope. 2767 S->AddDecl(DeclPtrTy::make(New)); 2768 if (II) 2769 IdResolver.AddDecl(New); 2770 2771 ProcessDeclAttributes(New, D); 2772 return DeclPtrTy::make(New); 2773} 2774 2775void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 2776 SourceLocation LocAfterDecls) { 2777 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2778 "Not a function declarator!"); 2779 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2780 2781 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2782 // for a K&R function. 2783 if (!FTI.hasPrototype) { 2784 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 2785 --i; 2786 if (FTI.ArgInfo[i].Param == 0) { 2787 std::string Code = " int "; 2788 Code += FTI.ArgInfo[i].Ident->getName(); 2789 Code += ";\n"; 2790 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2791 << FTI.ArgInfo[i].Ident 2792 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 2793 2794 // Implicitly declare the argument as type 'int' for lack of a better 2795 // type. 2796 DeclSpec DS; 2797 const char* PrevSpec; // unused 2798 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2799 PrevSpec); 2800 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2801 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2802 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2803 } 2804 } 2805 } 2806} 2807 2808Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 2809 Declarator &D) { 2810 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2811 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2812 "Not a function declarator!"); 2813 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2814 2815 if (FTI.hasPrototype) { 2816 // FIXME: Diagnose arguments without names in C. 2817 } 2818 2819 Scope *ParentScope = FnBodyScope->getParent(); 2820 2821 DeclPtrTy DP = ActOnDeclarator(ParentScope, D, /*IsFunctionDefinition=*/true); 2822 return ActOnStartOfFunctionDef(FnBodyScope, DP); 2823} 2824 2825Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 2826 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 2827 2828 // See if this is a redefinition. 2829 const FunctionDecl *Definition; 2830 if (FD->getBody(Definition)) { 2831 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2832 Diag(Definition->getLocation(), diag::note_previous_definition); 2833 } 2834 2835 // Builtin functions cannot be defined. 2836 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2837 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2838 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2839 FD->setInvalidDecl(); 2840 } 2841 } 2842 2843 // The return type of a function definition must be complete 2844 // (C99 6.9.1p3, C++ [dcl.fct]p6). 2845 QualType ResultType = FD->getResultType(); 2846 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 2847 RequireCompleteType(FD->getLocation(), ResultType, 2848 diag::err_func_def_incomplete_result)) 2849 FD->setInvalidDecl(); 2850 2851 // GNU warning -Wmissing-prototypes: 2852 // Warn if a global function is defined without a previous 2853 // prototype declaration. This warning is issued even if the 2854 // definition itself provides a prototype. The aim is to detect 2855 // global functions that fail to be declared in header files. 2856 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 2857 !FD->isMain()) { 2858 bool MissingPrototype = true; 2859 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 2860 Prev; Prev = Prev->getPreviousDeclaration()) { 2861 // Ignore any declarations that occur in function or method 2862 // scope, because they aren't visible from the header. 2863 if (Prev->getDeclContext()->isFunctionOrMethod()) 2864 continue; 2865 2866 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 2867 break; 2868 } 2869 2870 if (MissingPrototype) 2871 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 2872 } 2873 2874 PushDeclContext(FnBodyScope, FD); 2875 2876 // Check the validity of our function parameters 2877 CheckParmsForFunctionDef(FD); 2878 2879 // Introduce our parameters into the function scope 2880 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2881 ParmVarDecl *Param = FD->getParamDecl(p); 2882 Param->setOwningFunction(FD); 2883 2884 // If this has an identifier, add it to the scope stack. 2885 if (Param->getIdentifier()) 2886 PushOnScopeChains(Param, FnBodyScope); 2887 } 2888 2889 // Checking attributes of current function definition 2890 // dllimport attribute. 2891 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2892 // dllimport attribute cannot be applied to definition. 2893 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2894 Diag(FD->getLocation(), 2895 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2896 << "dllimport"; 2897 FD->setInvalidDecl(); 2898 return DeclPtrTy::make(FD); 2899 } else { 2900 // If a symbol previously declared dllimport is later defined, the 2901 // attribute is ignored in subsequent references, and a warning is 2902 // emitted. 2903 Diag(FD->getLocation(), 2904 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2905 << FD->getNameAsCString() << "dllimport"; 2906 } 2907 } 2908 return DeclPtrTy::make(FD); 2909} 2910 2911static bool StatementCreatesScope(Stmt* S) { 2912 2913 if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) { 2914 for (DeclStmt::decl_iterator I = DS->decl_begin(), E = DS->decl_end(); 2915 I != E; ++I) { 2916 if (VarDecl *D = dyn_cast<VarDecl>(*I)) { 2917 if (D->getType()->isVariablyModifiedType() || 2918 D->hasAttr<CleanupAttr>()) 2919 return true; 2920 } else if (TypedefDecl *D = dyn_cast<TypedefDecl>(*I)) { 2921 if (D->getUnderlyingType()->isVariablyModifiedType()) 2922 return true; 2923 } 2924 } 2925 } 2926 return false; 2927} 2928 2929 2930void Sema::RecursiveCalcLabelScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2931 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2932 std::vector<void*>& ScopeStack, 2933 Stmt* CurStmt, 2934 Stmt* ParentCompoundStmt) { 2935 for (Stmt::child_iterator i = CurStmt->child_begin(); 2936 i != CurStmt->child_end(); ++i) { 2937 if (!*i) continue; 2938 if (StatementCreatesScope(*i)) { 2939 ScopeStack.push_back(*i); 2940 PopScopeMap[*i] = ParentCompoundStmt; 2941 } else if (ObjCAtTryStmt *AT = dyn_cast<ObjCAtTryStmt>(*i)) { 2942 ScopeStack.push_back(*i); 2943 PopScopeMap[*i] = AT->getTryBody(); 2944 } else if (ObjCAtCatchStmt *AC = dyn_cast<ObjCAtCatchStmt>(*i)) { 2945 ScopeStack.push_back(*i); 2946 PopScopeMap[*i] = AC->getCatchBody(); 2947 } else if (ObjCAtFinallyStmt *AF = dyn_cast<ObjCAtFinallyStmt>(*i)) { 2948 ScopeStack.push_back(*i); 2949 PopScopeMap[*i] = AF->getFinallyBody(); 2950 } else if (isa<LabelStmt>(CurStmt)) { 2951 LabelScopeMap[CurStmt] = ScopeStack.size() ? ScopeStack.back() : 0; 2952 } 2953 if (isa<DeclStmt>(*i)) continue; 2954 Stmt* CurCompound = isa<CompoundStmt>(*i) ? *i : ParentCompoundStmt; 2955 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, 2956 *i, CurCompound); 2957 } 2958 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2959 ScopeStack.pop_back(); 2960 } 2961} 2962 2963void Sema::RecursiveCalcJumpScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2964 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2965 llvm::DenseMap<Stmt*, void*>& GotoScopeMap, 2966 std::vector<void*>& ScopeStack, 2967 Stmt* CurStmt) { 2968 for (Stmt::child_iterator i = CurStmt->child_begin(); 2969 i != CurStmt->child_end(); ++i) { 2970 if (!*i) continue; 2971 if (StatementCreatesScope(*i)) { 2972 ScopeStack.push_back(*i); 2973 } else if (GotoStmt* GS = dyn_cast<GotoStmt>(*i)) { 2974 void* LScope = LabelScopeMap[GS->getLabel()]; 2975 if (LScope) { 2976 bool foundScopeInStack = false; 2977 for (unsigned i = ScopeStack.size(); i > 0; --i) { 2978 if (LScope == ScopeStack[i-1]) { 2979 foundScopeInStack = true; 2980 break; 2981 } 2982 } 2983 if (!foundScopeInStack) { 2984 Diag(GS->getSourceRange().getBegin(), diag::err_goto_into_scope); 2985 } 2986 } 2987 } 2988 if (isa<DeclStmt>(*i)) continue; 2989 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, 2990 ScopeStack, *i); 2991 } 2992 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2993 ScopeStack.pop_back(); 2994 } 2995} 2996 2997Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 2998 Decl *dcl = D.getAs<Decl>(); 2999 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 3000 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 3001 FD->setBody(cast<CompoundStmt>(Body)); 3002 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3003 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3004 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3005 MD->setBody(cast<CompoundStmt>(Body)); 3006 } else { 3007 Body->Destroy(Context); 3008 return DeclPtrTy(); 3009 } 3010 PopDeclContext(); 3011 // Verify and clean out per-function state. 3012 3013 bool HaveLabels = !LabelMap.empty(); 3014 // Check goto/label use. 3015 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3016 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 3017 // Verify that we have no forward references left. If so, there was a goto 3018 // or address of a label taken, but no definition of it. Label fwd 3019 // definitions are indicated with a null substmt. 3020 if (I->second->getSubStmt() == 0) { 3021 LabelStmt *L = I->second; 3022 // Emit error. 3023 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3024 3025 // At this point, we have gotos that use the bogus label. Stitch it into 3026 // the function body so that they aren't leaked and that the AST is well 3027 // formed. 3028 if (Body) { 3029#if 0 3030 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 3031 // and the AST is malformed anyway. We should just blow away 'L'. 3032 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3033 cast<CompoundStmt>(Body)->push_back(L); 3034#else 3035 L->Destroy(Context); 3036#endif 3037 } else { 3038 // The whole function wasn't parsed correctly, just delete this. 3039 L->Destroy(Context); 3040 } 3041 } 3042 } 3043 LabelMap.clear(); 3044 3045 if (!Body) return D; 3046 3047 if (HaveLabels) { 3048 llvm::DenseMap<Stmt*, void*> LabelScopeMap; 3049 llvm::DenseMap<void*, Stmt*> PopScopeMap; 3050 llvm::DenseMap<Stmt*, void*> GotoScopeMap; 3051 std::vector<void*> ScopeStack; 3052 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, Body, Body); 3053 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, ScopeStack, Body); 3054 } 3055 3056 return D; 3057} 3058 3059/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3060/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3061NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3062 IdentifierInfo &II, Scope *S) { 3063 // Before we produce a declaration for an implicitly defined 3064 // function, see whether there was a locally-scoped declaration of 3065 // this name as a function or variable. If so, use that 3066 // (non-visible) declaration, and complain about it. 3067 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3068 = LocallyScopedExternalDecls.find(&II); 3069 if (Pos != LocallyScopedExternalDecls.end()) { 3070 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3071 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3072 return Pos->second; 3073 } 3074 3075 // Extension in C99. Legal in C90, but warn about it. 3076 if (getLangOptions().C99) 3077 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3078 else 3079 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3080 3081 // FIXME: handle stuff like: 3082 // void foo() { extern float X(); } 3083 // void bar() { X(); } <-- implicit decl for X in another scope. 3084 3085 // Set a Declarator for the implicit definition: int foo(); 3086 const char *Dummy; 3087 DeclSpec DS; 3088 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 3089 Error = Error; // Silence warning. 3090 assert(!Error && "Error setting up implicit decl!"); 3091 Declarator D(DS, Declarator::BlockContext); 3092 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 3093 0, 0, 0, Loc, D), 3094 SourceLocation()); 3095 D.SetIdentifier(&II, Loc); 3096 3097 // Insert this function into translation-unit scope. 3098 3099 DeclContext *PrevDC = CurContext; 3100 CurContext = Context.getTranslationUnitDecl(); 3101 3102 FunctionDecl *FD = 3103 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D, DeclPtrTy()).getAs<Decl>()); 3104 FD->setImplicit(); 3105 3106 CurContext = PrevDC; 3107 3108 AddKnownFunctionAttributes(FD); 3109 3110 return FD; 3111} 3112 3113/// \brief Adds any function attributes that we know a priori based on 3114/// the declaration of this function. 3115/// 3116/// These attributes can apply both to implicitly-declared builtins 3117/// (like __builtin___printf_chk) or to library-declared functions 3118/// like NSLog or printf. 3119void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3120 if (FD->isInvalidDecl()) 3121 return; 3122 3123 // If this is a built-in function, map its builtin attributes to 3124 // actual attributes. 3125 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3126 // Handle printf-formatting attributes. 3127 unsigned FormatIdx; 3128 bool HasVAListArg; 3129 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3130 if (!FD->getAttr<FormatAttr>()) 3131 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3132 FormatIdx + 2)); 3133 } 3134 3135 // Mark const if we don't care about errno and that is the only 3136 // thing preventing the function from being const. This allows 3137 // IRgen to use LLVM intrinsics for such functions. 3138 if (!getLangOptions().MathErrno && 3139 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3140 if (!FD->getAttr<ConstAttr>()) 3141 FD->addAttr(::new (Context) ConstAttr()); 3142 } 3143 } 3144 3145 IdentifierInfo *Name = FD->getIdentifier(); 3146 if (!Name) 3147 return; 3148 if ((!getLangOptions().CPlusPlus && 3149 FD->getDeclContext()->isTranslationUnit()) || 3150 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3151 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3152 LinkageSpecDecl::lang_c)) { 3153 // Okay: this could be a libc/libm/Objective-C function we know 3154 // about. 3155 } else 3156 return; 3157 3158 unsigned KnownID; 3159 for (KnownID = 0; KnownID != id_num_known_functions; ++KnownID) 3160 if (KnownFunctionIDs[KnownID] == Name) 3161 break; 3162 3163 switch (KnownID) { 3164 case id_NSLog: 3165 case id_NSLogv: 3166 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3167 // FIXME: We known better than our headers. 3168 const_cast<FormatAttr *>(Format)->setType("printf"); 3169 } else 3170 FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); 3171 break; 3172 3173 case id_asprintf: 3174 case id_vasprintf: 3175 if (!FD->getAttr<FormatAttr>()) 3176 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); 3177 break; 3178 3179 default: 3180 // Unknown function or known function without any attributes to 3181 // add. Do nothing. 3182 break; 3183 } 3184} 3185 3186TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3187 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3188 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3189 3190 // Scope manipulation handled by caller. 3191 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3192 D.getIdentifierLoc(), 3193 D.getIdentifier(), 3194 T); 3195 3196 if (TagType *TT = dyn_cast<TagType>(T)) { 3197 TagDecl *TD = TT->getDecl(); 3198 3199 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3200 // keep track of the TypedefDecl. 3201 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3202 TD->setTypedefForAnonDecl(NewTD); 3203 } 3204 3205 if (D.getInvalidType()) 3206 NewTD->setInvalidDecl(); 3207 return NewTD; 3208} 3209 3210/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3211/// former case, Name will be non-null. In the later case, Name will be null. 3212/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3213/// reference/declaration/definition of a tag. 3214Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3215 SourceLocation KWLoc, const CXXScopeSpec &SS, 3216 IdentifierInfo *Name, SourceLocation NameLoc, 3217 AttributeList *Attr, AccessSpecifier AS) { 3218 // If this is not a definition, it must have a name. 3219 assert((Name != 0 || TK == TK_Definition) && 3220 "Nameless record must be a definition!"); 3221 3222 TagDecl::TagKind Kind; 3223 switch (TagSpec) { 3224 default: assert(0 && "Unknown tag type!"); 3225 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3226 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3227 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3228 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3229 } 3230 3231 DeclContext *SearchDC = CurContext; 3232 DeclContext *DC = CurContext; 3233 NamedDecl *PrevDecl = 0; 3234 3235 bool Invalid = false; 3236 3237 if (Name && SS.isNotEmpty()) { 3238 // We have a nested-name tag ('struct foo::bar'). 3239 3240 // Check for invalid 'foo::'. 3241 if (SS.isInvalid()) { 3242 Name = 0; 3243 goto CreateNewDecl; 3244 } 3245 3246 // FIXME: RequireCompleteDeclContext(SS)? 3247 DC = computeDeclContext(SS); 3248 SearchDC = DC; 3249 // Look-up name inside 'foo::'. 3250 PrevDecl = dyn_cast_or_null<TagDecl>( 3251 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3252 3253 // A tag 'foo::bar' must already exist. 3254 if (PrevDecl == 0) { 3255 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3256 Name = 0; 3257 goto CreateNewDecl; 3258 } 3259 } else if (Name) { 3260 // If this is a named struct, check to see if there was a previous forward 3261 // declaration or definition. 3262 // FIXME: We're looking into outer scopes here, even when we 3263 // shouldn't be. Doing so can result in ambiguities that we 3264 // shouldn't be diagnosing. 3265 LookupResult R = LookupName(S, Name, LookupTagName, 3266 /*RedeclarationOnly=*/(TK != TK_Reference)); 3267 if (R.isAmbiguous()) { 3268 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3269 // FIXME: This is not best way to recover from case like: 3270 // 3271 // struct S s; 3272 // 3273 // causes needless "incomplete type" error later. 3274 Name = 0; 3275 PrevDecl = 0; 3276 Invalid = true; 3277 } 3278 else 3279 PrevDecl = R; 3280 3281 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3282 // FIXME: This makes sure that we ignore the contexts associated 3283 // with C structs, unions, and enums when looking for a matching 3284 // tag declaration or definition. See the similar lookup tweak 3285 // in Sema::LookupName; is there a better way to deal with this? 3286 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3287 SearchDC = SearchDC->getParent(); 3288 } 3289 } 3290 3291 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3292 // Maybe we will complain about the shadowed template parameter. 3293 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3294 // Just pretend that we didn't see the previous declaration. 3295 PrevDecl = 0; 3296 } 3297 3298 if (PrevDecl) { 3299 // Check whether the previous declaration is usable. 3300 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3301 3302 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3303 // If this is a use of a previous tag, or if the tag is already declared 3304 // in the same scope (so that the definition/declaration completes or 3305 // rementions the tag), reuse the decl. 3306 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3307 // Make sure that this wasn't declared as an enum and now used as a 3308 // struct or something similar. 3309 if (PrevTagDecl->getTagKind() != Kind) { 3310 bool SafeToContinue 3311 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 3312 Kind != TagDecl::TK_enum); 3313 if (SafeToContinue) 3314 Diag(KWLoc, diag::err_use_with_wrong_tag) 3315 << Name 3316 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 3317 PrevTagDecl->getKindName()); 3318 else 3319 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3320 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3321 3322 if (SafeToContinue) 3323 Kind = PrevTagDecl->getTagKind(); 3324 else { 3325 // Recover by making this an anonymous redefinition. 3326 Name = 0; 3327 PrevDecl = 0; 3328 Invalid = true; 3329 } 3330 } 3331 3332 if (!Invalid) { 3333 // If this is a use, just return the declaration we found. 3334 3335 // FIXME: In the future, return a variant or some other clue 3336 // for the consumer of this Decl to know it doesn't own it. 3337 // For our current ASTs this shouldn't be a problem, but will 3338 // need to be changed with DeclGroups. 3339 if (TK == TK_Reference) 3340 return DeclPtrTy::make(PrevDecl); 3341 3342 // Diagnose attempts to redefine a tag. 3343 if (TK == TK_Definition) { 3344 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3345 Diag(NameLoc, diag::err_redefinition) << Name; 3346 Diag(Def->getLocation(), diag::note_previous_definition); 3347 // If this is a redefinition, recover by making this 3348 // struct be anonymous, which will make any later 3349 // references get the previous definition. 3350 Name = 0; 3351 PrevDecl = 0; 3352 Invalid = true; 3353 } else { 3354 // If the type is currently being defined, complain 3355 // about a nested redefinition. 3356 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3357 if (Tag->isBeingDefined()) { 3358 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3359 Diag(PrevTagDecl->getLocation(), 3360 diag::note_previous_definition); 3361 Name = 0; 3362 PrevDecl = 0; 3363 Invalid = true; 3364 } 3365 } 3366 3367 // Okay, this is definition of a previously declared or referenced 3368 // tag PrevDecl. We're going to create a new Decl for it. 3369 } 3370 } 3371 // If we get here we have (another) forward declaration or we 3372 // have a definition. Just create a new decl. 3373 } else { 3374 // If we get here, this is a definition of a new tag type in a nested 3375 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3376 // new decl/type. We set PrevDecl to NULL so that the entities 3377 // have distinct types. 3378 PrevDecl = 0; 3379 } 3380 // If we get here, we're going to create a new Decl. If PrevDecl 3381 // is non-NULL, it's a definition of the tag declared by 3382 // PrevDecl. If it's NULL, we have a new definition. 3383 } else { 3384 // PrevDecl is a namespace, template, or anything else 3385 // that lives in the IDNS_Tag identifier namespace. 3386 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3387 // The tag name clashes with a namespace name, issue an error and 3388 // recover by making this tag be anonymous. 3389 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3390 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3391 Name = 0; 3392 PrevDecl = 0; 3393 Invalid = true; 3394 } else { 3395 // The existing declaration isn't relevant to us; we're in a 3396 // new scope, so clear out the previous declaration. 3397 PrevDecl = 0; 3398 } 3399 } 3400 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3401 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3402 // C.scope.pdecl]p5: 3403 // -- for an elaborated-type-specifier of the form 3404 // 3405 // class-key identifier 3406 // 3407 // if the elaborated-type-specifier is used in the 3408 // decl-specifier-seq or parameter-declaration-clause of a 3409 // function defined in namespace scope, the identifier is 3410 // declared as a class-name in the namespace that contains 3411 // the declaration; otherwise, except as a friend 3412 // declaration, the identifier is declared in the smallest 3413 // non-class, non-function-prototype scope that contains the 3414 // declaration. 3415 // 3416 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3417 // C structs and unions. 3418 // 3419 // GNU C also supports this behavior as part of its incomplete 3420 // enum types extension, while GNU C++ does not. 3421 // 3422 // Find the context where we'll be declaring the tag. 3423 // FIXME: We would like to maintain the current DeclContext as the 3424 // lexical context, 3425 while (SearchDC->isRecord()) 3426 SearchDC = SearchDC->getParent(); 3427 3428 // Find the scope where we'll be declaring the tag. 3429 while (S->isClassScope() || 3430 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3431 ((S->getFlags() & Scope::DeclScope) == 0) || 3432 (S->getEntity() && 3433 ((DeclContext *)S->getEntity())->isTransparentContext())) 3434 S = S->getParent(); 3435 } 3436 3437CreateNewDecl: 3438 3439 // If there is an identifier, use the location of the identifier as the 3440 // location of the decl, otherwise use the location of the struct/union 3441 // keyword. 3442 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3443 3444 // Otherwise, create a new declaration. If there is a previous 3445 // declaration of the same entity, the two will be linked via 3446 // PrevDecl. 3447 TagDecl *New; 3448 3449 if (Kind == TagDecl::TK_enum) { 3450 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3451 // enum X { A, B, C } D; D should chain to X. 3452 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3453 cast_or_null<EnumDecl>(PrevDecl)); 3454 // If this is an undefined enum, warn. 3455 if (TK != TK_Definition && !Invalid) { 3456 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3457 : diag::ext_forward_ref_enum; 3458 Diag(Loc, DK); 3459 } 3460 } else { 3461 // struct/union/class 3462 3463 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3464 // struct X { int A; } D; D should chain to X. 3465 if (getLangOptions().CPlusPlus) 3466 // FIXME: Look for a way to use RecordDecl for simple structs. 3467 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3468 cast_or_null<CXXRecordDecl>(PrevDecl)); 3469 else 3470 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3471 cast_or_null<RecordDecl>(PrevDecl)); 3472 } 3473 3474 if (Kind != TagDecl::TK_enum) { 3475 // Handle #pragma pack: if the #pragma pack stack has non-default 3476 // alignment, make up a packed attribute for this decl. These 3477 // attributes are checked when the ASTContext lays out the 3478 // structure. 3479 // 3480 // It is important for implementing the correct semantics that this 3481 // happen here (in act on tag decl). The #pragma pack stack is 3482 // maintained as a result of parser callbacks which can occur at 3483 // many points during the parsing of a struct declaration (because 3484 // the #pragma tokens are effectively skipped over during the 3485 // parsing of the struct). 3486 if (unsigned Alignment = getPragmaPackAlignment()) 3487 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3488 } 3489 3490 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3491 // C++ [dcl.typedef]p3: 3492 // [...] Similarly, in a given scope, a class or enumeration 3493 // shall not be declared with the same name as a typedef-name 3494 // that is declared in that scope and refers to a type other 3495 // than the class or enumeration itself. 3496 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3497 TypedefDecl *PrevTypedef = 0; 3498 if (Lookup.getKind() == LookupResult::Found) 3499 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3500 3501 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3502 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3503 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3504 Diag(Loc, diag::err_tag_definition_of_typedef) 3505 << Context.getTypeDeclType(New) 3506 << PrevTypedef->getUnderlyingType(); 3507 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3508 Invalid = true; 3509 } 3510 } 3511 3512 if (Invalid) 3513 New->setInvalidDecl(); 3514 3515 if (Attr) 3516 ProcessDeclAttributeList(New, Attr); 3517 3518 // If we're declaring or defining a tag in function prototype scope 3519 // in C, note that this type can only be used within the function. 3520 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3521 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3522 3523 // Set the lexical context. If the tag has a C++ scope specifier, the 3524 // lexical context will be different from the semantic context. 3525 New->setLexicalDeclContext(CurContext); 3526 3527 // Set the access specifier. 3528 SetMemberAccessSpecifier(New, PrevDecl, AS); 3529 3530 if (TK == TK_Definition) 3531 New->startDefinition(); 3532 3533 // If this has an identifier, add it to the scope stack. 3534 if (Name) { 3535 S = getNonFieldDeclScope(S); 3536 PushOnScopeChains(New, S); 3537 } else { 3538 CurContext->addDecl(Context, New); 3539 } 3540 3541 return DeclPtrTy::make(New); 3542} 3543 3544void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 3545 AdjustDeclIfTemplate(TagD); 3546 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3547 3548 // Enter the tag context. 3549 PushDeclContext(S, Tag); 3550 3551 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3552 FieldCollector->StartClass(); 3553 3554 if (Record->getIdentifier()) { 3555 // C++ [class]p2: 3556 // [...] The class-name is also inserted into the scope of the 3557 // class itself; this is known as the injected-class-name. For 3558 // purposes of access checking, the injected-class-name is treated 3559 // as if it were a public member name. 3560 CXXRecordDecl *InjectedClassName 3561 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3562 CurContext, Record->getLocation(), 3563 Record->getIdentifier(), Record); 3564 InjectedClassName->setImplicit(); 3565 InjectedClassName->setAccess(AS_public); 3566 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 3567 InjectedClassName->setDescribedClassTemplate(Template); 3568 PushOnScopeChains(InjectedClassName, S); 3569 assert(InjectedClassName->isInjectedClassName() && 3570 "Broken injected-class-name"); 3571 } 3572 } 3573} 3574 3575void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD) { 3576 AdjustDeclIfTemplate(TagD); 3577 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3578 3579 if (isa<CXXRecordDecl>(Tag)) 3580 FieldCollector->FinishClass(); 3581 3582 // Exit this scope of this tag's definition. 3583 PopDeclContext(); 3584 3585 // Notify the consumer that we've defined a tag. 3586 Consumer.HandleTagDeclDefinition(Tag); 3587} 3588 3589bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3590 QualType FieldTy, const Expr *BitWidth) { 3591 // C99 6.7.2.1p4 - verify the field type. 3592 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3593 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3594 // Handle incomplete types with specific error. 3595 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3596 return true; 3597 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3598 << FieldName << FieldTy << BitWidth->getSourceRange(); 3599 } 3600 3601 // If the bit-width is type- or value-dependent, don't try to check 3602 // it now. 3603 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3604 return false; 3605 3606 llvm::APSInt Value; 3607 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3608 return true; 3609 3610 // Zero-width bitfield is ok for anonymous field. 3611 if (Value == 0 && FieldName) 3612 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3613 3614 if (Value.isSigned() && Value.isNegative()) 3615 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3616 << FieldName << Value.toString(10); 3617 3618 if (!FieldTy->isDependentType()) { 3619 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3620 // FIXME: We won't need the 0 size once we check that the field type is valid. 3621 if (TypeSize && Value.getZExtValue() > TypeSize) 3622 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3623 << FieldName << (unsigned)TypeSize; 3624 } 3625 3626 return false; 3627} 3628 3629/// ActOnField - Each field of a struct/union/class is passed into this in order 3630/// to create a FieldDecl object for it. 3631Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 3632 SourceLocation DeclStart, 3633 Declarator &D, ExprTy *BitfieldWidth) { 3634 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 3635 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 3636 AS_public); 3637 return DeclPtrTy::make(Res); 3638} 3639 3640/// HandleField - Analyze a field of a C struct or a C++ data member. 3641/// 3642FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3643 SourceLocation DeclStart, 3644 Declarator &D, Expr *BitWidth, 3645 AccessSpecifier AS) { 3646 IdentifierInfo *II = D.getIdentifier(); 3647 SourceLocation Loc = DeclStart; 3648 if (II) Loc = D.getIdentifierLoc(); 3649 3650 QualType T = GetTypeForDeclarator(D, S); 3651 if (getLangOptions().CPlusPlus) 3652 CheckExtraCXXDefaultArguments(D); 3653 3654 DiagnoseFunctionSpecifiers(D); 3655 3656 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3657 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3658 PrevDecl = 0; 3659 3660 FieldDecl *NewFD 3661 = CheckFieldDecl(II, T, Record, Loc, 3662 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3663 BitWidth, AS, PrevDecl, &D); 3664 if (NewFD->isInvalidDecl() && PrevDecl) { 3665 // Don't introduce NewFD into scope; there's already something 3666 // with the same name in the same scope. 3667 } else if (II) { 3668 PushOnScopeChains(NewFD, S); 3669 } else 3670 Record->addDecl(Context, NewFD); 3671 3672 return NewFD; 3673} 3674 3675/// \brief Build a new FieldDecl and check its well-formedness. 3676/// 3677/// This routine builds a new FieldDecl given the fields name, type, 3678/// record, etc. \p PrevDecl should refer to any previous declaration 3679/// with the same name and in the same scope as the field to be 3680/// created. 3681/// 3682/// \returns a new FieldDecl. 3683/// 3684/// \todo The Declarator argument is a hack. It will be removed once 3685FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3686 RecordDecl *Record, SourceLocation Loc, 3687 bool Mutable, Expr *BitWidth, 3688 AccessSpecifier AS, NamedDecl *PrevDecl, 3689 Declarator *D) { 3690 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3691 bool InvalidDecl = false; 3692 3693 // If we receive a broken type, recover by assuming 'int' and 3694 // marking this declaration as invalid. 3695 if (T.isNull()) { 3696 InvalidDecl = true; 3697 T = Context.IntTy; 3698 } 3699 3700 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3701 // than a variably modified type. 3702 if (T->isVariablyModifiedType()) { 3703 bool SizeIsNegative; 3704 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3705 SizeIsNegative); 3706 if (!FixedTy.isNull()) { 3707 Diag(Loc, diag::warn_illegal_constant_array_size); 3708 T = FixedTy; 3709 } else { 3710 if (SizeIsNegative) 3711 Diag(Loc, diag::err_typecheck_negative_array_size); 3712 else 3713 Diag(Loc, diag::err_typecheck_field_variable_size); 3714 T = Context.IntTy; 3715 InvalidDecl = true; 3716 } 3717 } 3718 3719 // Fields can not have abstract class types 3720 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 3721 AbstractFieldType)) 3722 InvalidDecl = true; 3723 3724 // If this is declared as a bit-field, check the bit-field. 3725 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 3726 InvalidDecl = true; 3727 DeleteExpr(BitWidth); 3728 BitWidth = 0; 3729 } 3730 3731 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 3732 Mutable); 3733 3734 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 3735 Diag(Loc, diag::err_duplicate_member) << II; 3736 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3737 NewFD->setInvalidDecl(); 3738 Record->setInvalidDecl(); 3739 } 3740 3741 if (getLangOptions().CPlusPlus && !T->isPODType()) 3742 cast<CXXRecordDecl>(Record)->setPOD(false); 3743 3744 // FIXME: We need to pass in the attributes given an AST 3745 // representation, not a parser representation. 3746 if (D) 3747 ProcessDeclAttributes(NewFD, *D); 3748 3749 if (T.isObjCGCWeak()) 3750 Diag(Loc, diag::warn_attribute_weak_on_field); 3751 3752 if (InvalidDecl) 3753 NewFD->setInvalidDecl(); 3754 3755 NewFD->setAccess(AS); 3756 3757 // C++ [dcl.init.aggr]p1: 3758 // An aggregate is an array or a class (clause 9) with [...] no 3759 // private or protected non-static data members (clause 11). 3760 // A POD must be an aggregate. 3761 if (getLangOptions().CPlusPlus && 3762 (AS == AS_private || AS == AS_protected)) { 3763 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 3764 CXXRecord->setAggregate(false); 3765 CXXRecord->setPOD(false); 3766 } 3767 3768 return NewFD; 3769} 3770 3771/// TranslateIvarVisibility - Translate visibility from a token ID to an 3772/// AST enum value. 3773static ObjCIvarDecl::AccessControl 3774TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3775 switch (ivarVisibility) { 3776 default: assert(0 && "Unknown visitibility kind"); 3777 case tok::objc_private: return ObjCIvarDecl::Private; 3778 case tok::objc_public: return ObjCIvarDecl::Public; 3779 case tok::objc_protected: return ObjCIvarDecl::Protected; 3780 case tok::objc_package: return ObjCIvarDecl::Package; 3781 } 3782} 3783 3784/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3785/// in order to create an IvarDecl object for it. 3786Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 3787 SourceLocation DeclStart, 3788 Declarator &D, ExprTy *BitfieldWidth, 3789 tok::ObjCKeywordKind Visibility) { 3790 3791 IdentifierInfo *II = D.getIdentifier(); 3792 Expr *BitWidth = (Expr*)BitfieldWidth; 3793 SourceLocation Loc = DeclStart; 3794 if (II) Loc = D.getIdentifierLoc(); 3795 3796 // FIXME: Unnamed fields can be handled in various different ways, for 3797 // example, unnamed unions inject all members into the struct namespace! 3798 3799 QualType T = GetTypeForDeclarator(D, S); 3800 bool InvalidDecl = false; 3801 if (T.isNull()) { 3802 InvalidDecl = true; 3803 T = Context.IntTy; 3804 } 3805 3806 if (BitWidth) { 3807 // 6.7.2.1p3, 6.7.2.1p4 3808 if (VerifyBitField(Loc, II, T, BitWidth)) { 3809 InvalidDecl = true; 3810 DeleteExpr(BitWidth); 3811 BitWidth = 0; 3812 } 3813 } else { 3814 // Not a bitfield. 3815 3816 // validate II. 3817 3818 } 3819 3820 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3821 // than a variably modified type. 3822 if (T->isVariablyModifiedType()) { 3823 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3824 InvalidDecl = true; 3825 } 3826 3827 // Get the visibility (access control) for this ivar. 3828 ObjCIvarDecl::AccessControl ac = 3829 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3830 : ObjCIvarDecl::None; 3831 3832 // Construct the decl. 3833 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, 3834 (Expr *)BitfieldWidth); 3835 3836 if (II) { 3837 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3838 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3839 && !isa<TagDecl>(PrevDecl)) { 3840 Diag(Loc, diag::err_duplicate_member) << II; 3841 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3842 NewID->setInvalidDecl(); 3843 } 3844 } 3845 3846 // Process attributes attached to the ivar. 3847 ProcessDeclAttributes(NewID, D); 3848 3849 if (D.getInvalidType() || InvalidDecl) 3850 NewID->setInvalidDecl(); 3851 3852 if (II) { 3853 // FIXME: When interfaces are DeclContexts, we'll need to add 3854 // these to the interface. 3855 S->AddDecl(DeclPtrTy::make(NewID)); 3856 IdResolver.AddDecl(NewID); 3857 } 3858 3859 return DeclPtrTy::make(NewID); 3860} 3861 3862void Sema::ActOnFields(Scope* S, 3863 SourceLocation RecLoc, DeclPtrTy RecDecl, 3864 DeclPtrTy *Fields, unsigned NumFields, 3865 SourceLocation LBrac, SourceLocation RBrac, 3866 AttributeList *Attr) { 3867 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 3868 assert(EnclosingDecl && "missing record or interface decl"); 3869 3870 // If the decl this is being inserted into is invalid, then it may be a 3871 // redeclaration or some other bogus case. Don't try to add fields to it. 3872 if (EnclosingDecl->isInvalidDecl()) { 3873 // FIXME: Deallocate fields? 3874 return; 3875 } 3876 3877 3878 // Verify that all the fields are okay. 3879 unsigned NumNamedMembers = 0; 3880 llvm::SmallVector<FieldDecl*, 32> RecFields; 3881 3882 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3883 for (unsigned i = 0; i != NumFields; ++i) { 3884 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 3885 3886 // Get the type for the field. 3887 Type *FDTy = FD->getType().getTypePtr(); 3888 3889 if (!FD->isAnonymousStructOrUnion()) { 3890 // Remember all fields written by the user. 3891 RecFields.push_back(FD); 3892 } 3893 3894 // If the field is already invalid for some reason, don't emit more 3895 // diagnostics about it. 3896 if (FD->isInvalidDecl()) 3897 continue; 3898 3899 // C99 6.7.2.1p2: 3900 // A structure or union shall not contain a member with 3901 // incomplete or function type (hence, a structure shall not 3902 // contain an instance of itself, but may contain a pointer to 3903 // an instance of itself), except that the last member of a 3904 // structure with more than one named member may have incomplete 3905 // array type; such a structure (and any union containing, 3906 // possibly recursively, a member that is such a structure) 3907 // shall not be a member of a structure or an element of an 3908 // array. 3909 if (FDTy->isFunctionType()) { 3910 // Field declared as a function. 3911 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3912 << FD->getDeclName(); 3913 FD->setInvalidDecl(); 3914 EnclosingDecl->setInvalidDecl(); 3915 continue; 3916 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 3917 Record && Record->isStruct()) { 3918 // Flexible array member. 3919 if (NumNamedMembers < 1) { 3920 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3921 << FD->getDeclName(); 3922 FD->setInvalidDecl(); 3923 EnclosingDecl->setInvalidDecl(); 3924 continue; 3925 } 3926 // Okay, we have a legal flexible array member at the end of the struct. 3927 if (Record) 3928 Record->setHasFlexibleArrayMember(true); 3929 } else if (!FDTy->isDependentType() && 3930 RequireCompleteType(FD->getLocation(), FD->getType(), 3931 diag::err_field_incomplete)) { 3932 // Incomplete type 3933 FD->setInvalidDecl(); 3934 EnclosingDecl->setInvalidDecl(); 3935 continue; 3936 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3937 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3938 // If this is a member of a union, then entire union becomes "flexible". 3939 if (Record && Record->isUnion()) { 3940 Record->setHasFlexibleArrayMember(true); 3941 } else { 3942 // If this is a struct/class and this is not the last element, reject 3943 // it. Note that GCC supports variable sized arrays in the middle of 3944 // structures. 3945 if (i != NumFields-1) 3946 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 3947 << FD->getDeclName(); 3948 else { 3949 // We support flexible arrays at the end of structs in 3950 // other structs as an extension. 3951 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3952 << FD->getDeclName(); 3953 if (Record) 3954 Record->setHasFlexibleArrayMember(true); 3955 } 3956 } 3957 } 3958 } else if (FDTy->isObjCInterfaceType()) { 3959 /// A field cannot be an Objective-c object 3960 Diag(FD->getLocation(), diag::err_statically_allocated_object); 3961 FD->setInvalidDecl(); 3962 EnclosingDecl->setInvalidDecl(); 3963 continue; 3964 } 3965 // Keep track of the number of named members. 3966 if (FD->getIdentifier()) 3967 ++NumNamedMembers; 3968 } 3969 3970 // Okay, we successfully defined 'Record'. 3971 if (Record) { 3972 Record->completeDefinition(Context); 3973 } else { 3974 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3975 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3976 ID->setIVarList(ClsFields, RecFields.size(), Context); 3977 ID->setLocEnd(RBrac); 3978 3979 // Must enforce the rule that ivars in the base classes may not be 3980 // duplicates. 3981 if (ID->getSuperClass()) { 3982 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3983 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3984 ObjCIvarDecl* Ivar = (*IVI); 3985 IdentifierInfo *II = Ivar->getIdentifier(); 3986 ObjCIvarDecl* prevIvar = 3987 ID->getSuperClass()->lookupInstanceVariable(Context, II); 3988 if (prevIvar) { 3989 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3990 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3991 } 3992 } 3993 } 3994 } else if (ObjCImplementationDecl *IMPDecl = 3995 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3996 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3997 IMPDecl->setIVarList(ClsFields, RecFields.size(), Context); 3998 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3999 } 4000 } 4001 4002 if (Attr) 4003 ProcessDeclAttributeList(Record, Attr); 4004} 4005 4006EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 4007 EnumConstantDecl *LastEnumConst, 4008 SourceLocation IdLoc, 4009 IdentifierInfo *Id, 4010 ExprArg val) { 4011 Expr *Val = (Expr *)val.get(); 4012 4013 llvm::APSInt EnumVal(32); 4014 QualType EltTy; 4015 if (Val && !Val->isTypeDependent()) { 4016 // Make sure to promote the operand type to int. 4017 UsualUnaryConversions(Val); 4018 if (Val != val.get()) { 4019 val.release(); 4020 val = Val; 4021 } 4022 4023 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 4024 SourceLocation ExpLoc; 4025 if (!Val->isValueDependent() && 4026 VerifyIntegerConstantExpression(Val, &EnumVal)) { 4027 Val = 0; 4028 } else { 4029 EltTy = Val->getType(); 4030 } 4031 } 4032 4033 if (!Val) { 4034 if (LastEnumConst) { 4035 // Assign the last value + 1. 4036 EnumVal = LastEnumConst->getInitVal(); 4037 ++EnumVal; 4038 4039 // Check for overflow on increment. 4040 if (EnumVal < LastEnumConst->getInitVal()) 4041 Diag(IdLoc, diag::warn_enum_value_overflow); 4042 4043 EltTy = LastEnumConst->getType(); 4044 } else { 4045 // First value, set to zero. 4046 EltTy = Context.IntTy; 4047 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 4048 } 4049 } 4050 4051 val.release(); 4052 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 4053 Val, EnumVal); 4054} 4055 4056 4057Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 4058 DeclPtrTy lastEnumConst, 4059 SourceLocation IdLoc, 4060 IdentifierInfo *Id, 4061 SourceLocation EqualLoc, ExprTy *val) { 4062 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 4063 EnumConstantDecl *LastEnumConst = 4064 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 4065 Expr *Val = static_cast<Expr*>(val); 4066 4067 // The scope passed in may not be a decl scope. Zip up the scope tree until 4068 // we find one that is. 4069 S = getNonFieldDeclScope(S); 4070 4071 // Verify that there isn't already something declared with this name in this 4072 // scope. 4073 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 4074 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4075 // Maybe we will complain about the shadowed template parameter. 4076 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 4077 // Just pretend that we didn't see the previous declaration. 4078 PrevDecl = 0; 4079 } 4080 4081 if (PrevDecl) { 4082 // When in C++, we may get a TagDecl with the same name; in this case the 4083 // enum constant will 'hide' the tag. 4084 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 4085 "Received TagDecl when not in C++!"); 4086 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 4087 if (isa<EnumConstantDecl>(PrevDecl)) 4088 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 4089 else 4090 Diag(IdLoc, diag::err_redefinition) << Id; 4091 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4092 if (Val) Val->Destroy(Context); 4093 return DeclPtrTy(); 4094 } 4095 } 4096 4097 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 4098 IdLoc, Id, Owned(Val)); 4099 4100 // Register this decl in the current scope stack. 4101 if (New) 4102 PushOnScopeChains(New, S); 4103 4104 return DeclPtrTy::make(New); 4105} 4106 4107// FIXME: For consistency with ActOnFields(), we should have the parser 4108// pass in the source location for the left/right braces. 4109void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclPtrTy EnumDeclX, 4110 DeclPtrTy *Elements, unsigned NumElements) { 4111 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 4112 QualType EnumType = Context.getTypeDeclType(Enum); 4113 4114 // TODO: If the result value doesn't fit in an int, it must be a long or long 4115 // long value. ISO C does not support this, but GCC does as an extension, 4116 // emit a warning. 4117 unsigned IntWidth = Context.Target.getIntWidth(); 4118 4119 // Verify that all the values are okay, compute the size of the values, and 4120 // reverse the list. 4121 unsigned NumNegativeBits = 0; 4122 unsigned NumPositiveBits = 0; 4123 4124 // Keep track of whether all elements have type int. 4125 bool AllElementsInt = true; 4126 4127 for (unsigned i = 0; i != NumElements; ++i) { 4128 EnumConstantDecl *ECD = 4129 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4130 if (!ECD) continue; // Already issued a diagnostic. 4131 4132 // If the enum value doesn't fit in an int, emit an extension warning. 4133 const llvm::APSInt &InitVal = ECD->getInitVal(); 4134 assert(InitVal.getBitWidth() >= IntWidth && 4135 "Should have promoted value to int"); 4136 if (InitVal.getBitWidth() > IntWidth) { 4137 llvm::APSInt V(InitVal); 4138 V.trunc(IntWidth); 4139 V.extend(InitVal.getBitWidth()); 4140 if (V != InitVal) 4141 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4142 << InitVal.toString(10); 4143 } 4144 4145 // Keep track of the size of positive and negative values. 4146 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4147 NumPositiveBits = std::max(NumPositiveBits, 4148 (unsigned)InitVal.getActiveBits()); 4149 else 4150 NumNegativeBits = std::max(NumNegativeBits, 4151 (unsigned)InitVal.getMinSignedBits()); 4152 4153 // Keep track of whether every enum element has type int (very commmon). 4154 if (AllElementsInt) 4155 AllElementsInt = ECD->getType() == Context.IntTy; 4156 } 4157 4158 // Figure out the type that should be used for this enum. 4159 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4160 QualType BestType; 4161 unsigned BestWidth; 4162 4163 if (NumNegativeBits) { 4164 // If there is a negative value, figure out the smallest integer type (of 4165 // int/long/longlong) that fits. 4166 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4167 BestType = Context.IntTy; 4168 BestWidth = IntWidth; 4169 } else { 4170 BestWidth = Context.Target.getLongWidth(); 4171 4172 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4173 BestType = Context.LongTy; 4174 else { 4175 BestWidth = Context.Target.getLongLongWidth(); 4176 4177 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4178 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4179 BestType = Context.LongLongTy; 4180 } 4181 } 4182 } else { 4183 // If there is no negative value, figure out which of uint, ulong, ulonglong 4184 // fits. 4185 if (NumPositiveBits <= IntWidth) { 4186 BestType = Context.UnsignedIntTy; 4187 BestWidth = IntWidth; 4188 } else if (NumPositiveBits <= 4189 (BestWidth = Context.Target.getLongWidth())) { 4190 BestType = Context.UnsignedLongTy; 4191 } else { 4192 BestWidth = Context.Target.getLongLongWidth(); 4193 assert(NumPositiveBits <= BestWidth && 4194 "How could an initializer get larger than ULL?"); 4195 BestType = Context.UnsignedLongLongTy; 4196 } 4197 } 4198 4199 // Loop over all of the enumerator constants, changing their types to match 4200 // the type of the enum if needed. 4201 for (unsigned i = 0; i != NumElements; ++i) { 4202 EnumConstantDecl *ECD = 4203 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4204 if (!ECD) continue; // Already issued a diagnostic. 4205 4206 // Standard C says the enumerators have int type, but we allow, as an 4207 // extension, the enumerators to be larger than int size. If each 4208 // enumerator value fits in an int, type it as an int, otherwise type it the 4209 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4210 // that X has type 'int', not 'unsigned'. 4211 if (ECD->getType() == Context.IntTy) { 4212 // Make sure the init value is signed. 4213 llvm::APSInt IV = ECD->getInitVal(); 4214 IV.setIsSigned(true); 4215 ECD->setInitVal(IV); 4216 4217 if (getLangOptions().CPlusPlus) 4218 // C++ [dcl.enum]p4: Following the closing brace of an 4219 // enum-specifier, each enumerator has the type of its 4220 // enumeration. 4221 ECD->setType(EnumType); 4222 continue; // Already int type. 4223 } 4224 4225 // Determine whether the value fits into an int. 4226 llvm::APSInt InitVal = ECD->getInitVal(); 4227 bool FitsInInt; 4228 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4229 FitsInInt = InitVal.getActiveBits() < IntWidth; 4230 else 4231 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4232 4233 // If it fits into an integer type, force it. Otherwise force it to match 4234 // the enum decl type. 4235 QualType NewTy; 4236 unsigned NewWidth; 4237 bool NewSign; 4238 if (FitsInInt) { 4239 NewTy = Context.IntTy; 4240 NewWidth = IntWidth; 4241 NewSign = true; 4242 } else if (ECD->getType() == BestType) { 4243 // Already the right type! 4244 if (getLangOptions().CPlusPlus) 4245 // C++ [dcl.enum]p4: Following the closing brace of an 4246 // enum-specifier, each enumerator has the type of its 4247 // enumeration. 4248 ECD->setType(EnumType); 4249 continue; 4250 } else { 4251 NewTy = BestType; 4252 NewWidth = BestWidth; 4253 NewSign = BestType->isSignedIntegerType(); 4254 } 4255 4256 // Adjust the APSInt value. 4257 InitVal.extOrTrunc(NewWidth); 4258 InitVal.setIsSigned(NewSign); 4259 ECD->setInitVal(InitVal); 4260 4261 // Adjust the Expr initializer and type. 4262 if (ECD->getInitExpr()) 4263 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4264 /*isLvalue=*/false)); 4265 if (getLangOptions().CPlusPlus) 4266 // C++ [dcl.enum]p4: Following the closing brace of an 4267 // enum-specifier, each enumerator has the type of its 4268 // enumeration. 4269 ECD->setType(EnumType); 4270 else 4271 ECD->setType(NewTy); 4272 } 4273 4274 Enum->completeDefinition(Context, BestType); 4275} 4276 4277Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4278 ExprArg expr) { 4279 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 4280 4281 return DeclPtrTy::make(FileScopeAsmDecl::Create(Context, CurContext, 4282 Loc, AsmString)); 4283} 4284 4285